quality Rock Drill Parts & Rock Drilling Bits factory

Xi'an Huizhong Machinery Equipment Co., Ltd. Successfully Delivers Montabert HC95 Rock Drill to Support Anyang Linzhou Hydropower Station Tunnel Construction [March 2024, Xi'an] Recently, Xi'an Huizhong Machinery Equipment Co., Ltd. successfully completed the sale of a Montabert HC95 rock drill, which has been put into operation for the tunnel excavation project of the Anyang Linzhou Hydropower Station, providing efficient support for the construction. Since its delivery, the Montabert HC95 rock drill has demonstrated excellent performance and stable operation, accumulating a total of 1,600 working hours. To ensure its continued efficiency, the project team recently conducted comprehensive maintenance and servicing, ensuring the equipment remains capable of handling high-intensity construction tasks. As a company specializing in the sales and service of construction machinery, Xi'an Huizhong Machinery Equipment Co., Ltd. is committed to providing high-quality products and comprehensive after-sales support. This maintenance work further highlights the company's dedication to equipment quality and customer satisfaction. Looking ahead, Xi'an Huizhong Machinery Equipment Co., Ltd. will continue to uphold its professional standards, offering high-performance equipment and excellent services to support various infrastructure construction projects and contribute to industry development.  

The hydraulic rock drill was developed by the French Montabert company in 1970 and installed on the hydraulic drilling rig to facilitate mine drilling. In the development in recent years, due to the unique technical performance and perforation efficiency of hydraulic rock drills, countries all over the world have increased the research and development of hydraulic rock drills. A series of hydraulic rock drills are used in the field of tunnel traffic to improve the technical level of highway engineering construction. With continuous technological innovation, hydraulic rock drilling rigs and rock drilling robots have come out, which has expanded the application space of hydraulic rock drills and brought some application problems. Under such an environmental background, it is of great practical significance to explore the application and development trend of hydraulic rock drills. 1 Application of hydraulic rock drill 1.1 The front cover is loose The front end cover and the rotating shell of the hydraulic rock drill are mainly connected by threads. When in use, under the influence of high-pressure shock and vibration, the front end cover and the rotating shell will loosen and buckle, causing the two convex wires to be damaged. In fact, the looseness of the front end cover will cause a certain large gap between the front end cover and the rotating housing, and jumping occurs during use, and the rear rotating large gear will be directly damaged by axial impact. The water seal is set on the front end cover. Due to violent beating, the sealing performance of the water seal will be destroyed. The flushing water will easily enter the rotating motor and enter the hydraulic oil tank through the motor oil return pipe, which will eventually cause the hydraulic oil to deteriorate, which is not conducive to the operation of the entire system. . In addition, water has a certain corrosive effect, which will rust the pumps and valves in the system and cause system failure. 1.2 Piston strain In the process of road construction, new requirements are put forward for the technology of rock drilling rigs. The technical level of rock drilling machines will affect the construction efficiency of the entire road project, and the impact piston is a key component of the hydraulic rock drilling machine. In the long-term operation, the scrapping of parts due to piston strain frequently occurs during construction, especially for imported impact pistons, which are expensive, and scrapping and replacing will bring large production costs. Taking this into consideration, the person in charge decided to replace the cheaper domestic piston for the experiment. The piston did not impact, but found that the rock drill could not complete the return movement during the impact of the piston, which affected the system operation. 1.3 Difficulty in rotating pressure test Through the test, the pressure of the rotary motor of the hydraulic rock drill is 150Bar. The test bench does not have any loading device, so the rotary pressure of the hydraulic rock drill cannot be accurately tested, and it is impossible to judge whether the rotary motor is normal. The hydraulic rock drill can only be set on the trolley to judge Rotary pressure, often due to insufficient rotary pressure to rework many times, wastes manpower and material resources. At the same time, the rock drilling jumbo contains a large number of hydraulic system components, the operation process is complicated, and the hydraulic components are prone to failure, which reduces the rotational pressure of the rock drill, is not conducive to interference judgment, takes a long time to troubleshoot, and has a large workload. 2 Application and modification of hydraulic rock drill 2.1 Optimize the installation method and solve the problem of loose front cover For the loosening of the front end cover, construction personnel generally choose the following methods: one is to reversely install the skeleton oil seal, the other is to install a fastening agent on the front thread, and the third is to connect the front end cover and the rotating housing together, but these methods cannot fundamentally to solve the problem. After the rock drill was disassembled, the construction personnel measured the dimensions of each component, and found that there was a gap of about 13.5 mm between the front end cover and the water seal position. Among them, the wall thickness of the front end cover was 20 mm, and positioning bolts could be set here to achieve Tightening and relaxing effect. After tightening the front end cover and the rotating housing, drill a Φ6.8mm, 2.5mm deep internal control, ream the hole to make the depth 10mm, tap and install the hexagonal bolt, so that the hexagonal bolt and the threaded connection position are tightly connected, so as to To achieve the effect of loosening. 2.2 Improve the surface of the piston to solve the problem of piston punching and straining The problem of piston strain is mainly caused by the loss of balance of the piston balance groove and the lubrication effect of oil storage. On the basis of ensuring the strength of the material, the original balance groove is deepened and widened by mechanical processing, which meets the processing accuracy requirements. Process and transform all the balance grooves on the surface of the piston, install the modified impact piston on the hydraulic rock drill, and repeatedly test, it is found that the impact and direction of the piston are relatively sensitive, which can be applied to road construction to ensure the normal operation of rock drilling operations. Various technical requirements and production standards. After five months of use, the construction personnel dismantled and inspected the piston of the hydraulic rock drill, and did not find any signs of wear and strain, which once again proved the effectiveness of the transformation. Considering the high price of imported equipment, in order to control the cost of equipment consumption, on the basis of ensuring the normal operation of the rock drill, the domestic impact piston was selected to replace the original imported impact piston. Since the technical standard has not yet been reached, in the comparison experiment, the imported impact piston was measured. The position of the piston, the main reason why the domestic piston cannot meet the requirements is that the size of the force-bearing surface used to reduce the impact inertia is about 2mm larger than that of the imported piston. In actual movement, increasing the outer diameter of the piston will cause the return oil circuit to be closed. In the optimized transformation, the outer diameter of the piston is ground, the circuit clearance is increased, and the pressure difference between the steps is formed, thereby promoting the completion of the piston return action. 2.3 Optimize the pressure test and solve the problem that cannot be tested The transmission shaft is installed on the hydraulic test bench, which is respectively connected to the rotary motor of the rock drill and the bracket. A safety valve with a limit value of 170 Bar is installed on the oil supply circuit of the rotary motor to avoid the problem of system overload. In the experiment, the loading valve is used to pressurize the rotary motor of the rock drill until the maximum limit. If the pressure remains stable, it means that the rotary motor of the rock drill is in normal working condition, otherwise it means that there is a fault, and the processing continues. It can be seen from this that using the pressure test to help construction personnel accurately judge the operating status of the rock drill rotary motor can not only realize the quality inspection of the rock drill after repair, ensure the performance of the rock drill, save a lot of unnecessary repairs, but also judge the rock drill through the test method. Troubleshooting causes, saving troubleshooting time, and effectively improving the maintenance efficiency of hydraulic rock drills. 3. Development trend of hydraulic rock drill 3.1 Upsizing After the continuous innovation and improvement of the structure of the hydraulic rock drill, the technical performance has become more and more perfect, and the parts have been greatly improved and improved in terms of parts accuracy, reliability and wear resistance, and a heavy-duty hydraulic rock drill has been developed. The operation makes the hydraulic rock drilling equipment develop in the direction of large-aperture drilling, which further improves the drilling efficiency and reduces the operating cost. The application of large-aperture hydraulic drilling rigs is conducive to the drilling of inclined holes, which greatly enhances the blasting effect, improves the quality of ore grinding and crushing, and is conducive to later shipment. 3.2 Evolution of high-speed drilling In the development and application of high-power heavy-duty hydraulic rock drills, the structural parameters of hydraulic rock drills have become more reasonable and scientific, especially the structural strength, stiffness, and reliability of parts have been rationally designed, and performance parameters can be automatically adjusted according to rock conditions. , to realize the improvement of the operating efficiency and drilling speed of the hydraulic rock drill. 3.3 High precision Hydraulic rock drills are mainly based on ordinary drilling tools, which have a high drilling speed and low wear. In actual use, the blast hole will be deflected, which will reduce the drilling accuracy. In recent years, some foreign manufacturers have increased their research on drilling tools for hydraulic rock drills and achieved remarkable results. In 2009, Sandvik Company developed a composite drilling tool set, which effectively separates the large pipe rotation and the drilling head, and transmits the impact force formed during the operation of the hydraulic rock drill to the rock, including the outer casing and the internal drilling rod. The position is connected by the recoil buffer to keep the alignment accurate, and the drill rod is installed at the concentricity of the casing so that the drill rod can only transmit the impact force and provide propulsion for the operation of the hydraulic rock drill. The function of the casing and the drill pipe is the same, mainly to transmit the rotary motion to the drill bit, as the direct guide rail of the drill set, strengthen the drill set system, and then improve the accuracy of the blast hole. 4 Conclusion The diesel engine contains an electronically controlled fuel injection system. In actual operation, the fuel injection volume can be adjusted according to the usage requirements to promote the mixing of oil and gas to achieve full combustion, reduce NOX, PM and other harmful gas emissions, and avoid damage to the environment. severe pollution. Build an ergonomic cab, anti-rolling, noise, falling stones, and has the advantages of panoramic vision and air purification. At the same time, the hydraulic rock drill will not discharge oil mist and noise during actual use, realizing the safety, comfort and environmental protection of equipment operation. At present, the noise of hydraulic rock drills exceeds 90dB, and its sound source is in the frequency range of 1-5kHAz, which is within the sensitive frequency of human ears. Relevant manufacturers are also stepping up research on environmental protection of hydraulic rock drills. Through comprehensive measures, the operation of the drilling rig is controlled by long-distance wired or wireless, so that the operator is out of the noise environment and ensures the health of the ears.

Servicing a MONTABERT HC109 Rock Drill  

Development trend of rock drilling equipment is to use hydraulic rock drills   Modern drilling rigs and advanced blasting techniques are the keys to shortening the drilling process time in the tunnelling cycle. Practice has proved that the performance of hydraulic rock drill is better than that of pneumatic rock drill, which not only saves energy significantly, but also improves the working environment. The simbah252 hydraulic mining drilling rig is mainly used for underground mine caving mining to drill vertical fan-shaped or annular blastholes, and can drill parallel blastholes with a spacing of 1.5m in the vertical direction. The drilling rig is equipped with an advanced hydraulic rock drill, which is most suitable for medium Deep hole connecting rod rock drilling, the hole depth can reach 30m.     1. Analysis of hydraulic system of mining drilling rig   The hydraulic system of the drilling rig can be divided into three parts according to its functions and functions, namely the positioning system of the drilling rig, the rock drilling system and the walking system. The functions, working principles and characteristics of these three parts are analyzed and explained in detail below. The positioning system of the drilling rig mainly plays two roles of stabilizing the whole vehicle and fixing the drilling arm when the drilling rig is working. The actuator of the whole system consists of 1 motor and 11 oil cylinders. The motor can make the drill boom rotate 360°, of which 4 foot cylinders play the role of stabilizing the drill rig, 2 upper and lower pillar cylinders play the role of fixing the drill boom when the drill rig is drilling, and the other 5 cylinders make the drill boom stable Pitch, roll, and move up and down. The positioning system of the drilling rig is relatively simple. The pressure oil pumped by the hydraulic pump passes through the high-pressure filter, the reversing valve 5 and the pressure reducing valve 6. After the pressure drops to 12mpa, it acts on each positioning actuator through the reversing valve group. The return oil of each actuator flows back to the oil tank through the reversing valve group. The 11 oil cylinders in the positioning system have a blocking function. The pressure oil acts on one side of the oil cylinder through the hydraulic control one-way valve. The control oil opens the hydraulic control one-way valve, and the oil flows. After the oil cylinder action reaches the required position, the oil supply is stopped; Due to the function of the hydraulic control one-way valve, the oil in the cylinder does not flow due to external force, and has a self-locking function. When the upper and lower strut cylinders are extended, the pressure oil will be decompressed to 2mpa and 7mpa by the one-way pressure reducing valve and then act on the bottom of the piston to ensure the smooth operation of the piston and accurate positioning, so as not to cause poor positioning due to excessive pressure. The mechanical structure of the drilling rig can be calibrated and destroyed; when the piston rod is retracted, the return oil returns to the oil tank through the check valve and the reversing valve 7 to achieve rapid recovery. Since the actuator of the positioning system is basically a double-acting plunger cylinder, it is characterized by sensitive response, rapid and accurate action. In order to ensure the stability of the drilling rig when it is working or parking, each oil cylinder is equipped with a self-locking valve, and the inlet and outlet of the two pitching oil cylinders and the two small side swing oil cylinders are equipped with one-way throttle valves to ensure that the oil cylinders can run in both directions. It can be stable without pulsation, and the resistance of oil returning through the one-way valve is small. The walking system, also known as the traction system, is composed of a hydraulic motor, a steering cylinder, a brake cylinder and a hydraulic valve. The walking, steering and braking of the vehicle are completed by the walking system. Since the pump station is driven by a motor, the walking distance cannot exceed the length of the connected cable, and the long-distance walking can only be driven by other motor vehicles. The pressure oil manual reversing valve 10 reaches the valve group 5 through the bypass type speed regulating valve 9 and the sequence valve 8. The reversing valve 7 sends the control oil to the reversing valve side of the valve group 5, and the pressure oil in the main oil pipe A circuit is formed to make the motor turn or the cylinder act to complete the walking or turning. The stop valve 3 and the stop valve 4 must be turned to the closed position when the pump station drives the walking, and the stop state is in place, and the steering cylinder and the hydraulic motor can move to complete the steering and walking tasks; when the trailer is towed, the stop valve 3 and the stop valve 4 are connected. , Steering cylinder and hydraulic motor and shut-off valve form a closed circuit, and the follow-up action is completed when the trailer is towed. During the rock drilling process, shut-off valve 3 and shut-off valve 4 should be connected to avoid misoperation and equipment failure. The speed regulating valve 9 makes the running speed of the steering cylinder adjustable. The valve group 5 is composed of a hydraulic reversing valve and a one-way sequence valve. When the load pressure exceeds the set value of the sequence valve by 28mpa, the pressure oil is unloaded through the sequence valve to achieve the purpose of protecting the actuator. The function of the differential pressure reducing valve 11 is to keep the control oil pressure at 3mpa. The one-way sequence valve 8 has two modes, external control and internal control, to ensure that the sequence valve can be turned on under any circumstances. The speed regulating valve 6 is installed on the control oil circuit at both ends of the reversing valve 7, so that the control oil flow is stable without fluctuation, and the reversing valve 7 is guaranteed to be stable without impact, so that the starting speed of the drilling rig is stable and there is no jumping. The rock drilling system supports the rock drill of the drilling rig to complete the rotation, impact and propulsion actions to meet the needs of actual rock drilling conditions. The pressure oil provided by the rotary pump 2 leads the oil flow to the rotary motor of the rock drill through the reversing valve 17 of the rotary circuit, and returns to the oil tank through the cooler and filter to form a circuit. Shock pump 3 is used for shock, positioning, propulsion and traction circuits. The pump has pressure compensation performance and is pre-adjusted to 28mpa with safety valve 7 to protect the circuit. The oil from the impact pump 3 flows partly to the pressure reducing valve 20, partly to the impact reversing valve 15, and there is an outlet through the pressure reducing valve 20 to the propeller, the positioning device and the drill pipe seat. The shock oil flows to the shock machine through the reversing valve 15. High shock pressures are obtained when the valve is moved to the r position. The shuttle valve 8 prevents oil from flowing back to the tank through the reversing valve 15; when the reversing valve 15 is moved to the 1 position, a low surge pressure is obtained as the oil passes through the restrictor 11. The pressure is indicated on the pressure gauge 9 . The return oil of the shock circuit is turned back to the tank through the cooler and filter to form a circuit. In order to obtain different predetermined speeds when opening the hole, connecting rod and rock drilling, the system is equipped with a relief valve and a reversing valve 21, these relief valves control the pressure reducing valve 20 to obtain three thrust pressures. Propulsion when opening the eyes: When opening the eyes, the propulsion speed and pressure must be limited. Through the reversing valve 21, the relief valve 23 controls the pressure reducing valve 20 to provide a propulsion pressure of 2 mpa, and the reversing valve 14 makes the oil flow through the speed regulating valve 12a, thereby The propeller is propelled at a low speed, and the reversing valve 10 is used to control the action direction of the propeller. Propulsion during rock drilling: During rock drilling, the relief valve 24 controls the pressure reducing valve 20 to provide a propulsion pressure of 7 mpa through the reversing valve 21. At this time, the valve 14 does not act, so the oil passes through the flow control valve 12b, which is a Fully open, oil flows continuously to the thrusters, which receive the amount of oil required for the actual piercing speed. During rock drilling, such as drilling into a cavity, the speed regulating valve 5 can limit the speed by limiting the oil return from the propeller. Propulsion when connecting, unloading and operating the drill pipe: the fast forward and backward advance of the drill pipe when connecting and unloading the rod is controlled by the reversing valve 16, and the reversing valve 21 makes the relief valve 25 control the pressure reducing valve 20 Provide a propulsion pressure of 14mpa, and the c of the air valve gives an air pressure signal to make the reversing valve 16 move to realize the forward and backward movement of the propulsion cylinder; when connecting and unloading the rod, the forward and backward propulsion speed and rotation speed and screw thread. suit the speed. Valve 14 does not work, valve 10 is in position f when the rod is connected, and is in position b when the rod is unloaded. The four one-way valves 4 act as rectifiers, and the flow speed regulating valve 12 adjusts the propulsion speed to match the thread of the drill pipe. Anti-sticking device: It has the function of reducing the risk of sticking of the drill pipe and the drill bit when drilling rocks with cracks or cavities. When the drill bit or the drill pipe is stuck in the hole, the pressure of the rotary circuit increases. When the pressure exceeds the preset value of the pressure switch 7, the pressure switch will act, so that the reversing valve 10 is at the position b, and the push cylinder returns at this time. When the pressure of the propulsion circuit drops, the pressure switch 6 is actuated, and it gives an electric pulse to the shock reversing valve 15, and the valve 15 turns into a low pressure shock. When the pressure of the rotating circuit drops below the set value of the pressure switch, the switch does not act, and the reversing valve 10 and the reversing valve 15 act in the opposite direction again, continue to advance and continue to turn into high-pressure shock. A8v58dd2r101f1 biaxial piston variable pump 3 with pressure compensation, used for impact, propulsion, drill pipe seat, positioning, traction circuit. It is powered by a 55kw motor, the maximum displacement of the pump is 58cm3r-1, and the rated speed of the motor It is 1480rmin-1, the gear ratio of the pump is 1.24, the speed of the pump is 1830rmin-1, and the maximum flow rate is 106lmin-1. When the system pressure is lower than the pressure setting on valve 5, the positioning of the valve is controlled by the spring, the valve is closed, and the system pressure acting on the rod side of the regulating piston keeps the pump at maximum displacement. When the system pressure rises to When the pressure is set, valve 5 is opened, the system pressure is transmitted to the piston side of the regulating piston, and then the pump is re-regulated to reduce the displacement to the equilibrium position, that is, the oil flow at the pressure setting value of valve 5 matches the requirements of the system . The restrictor 4b between the valve 5 and the regulating piston 4a is used to prevent the fluctuation of the pressure change in the regulating system. The regulating piston is spring loaded and gives full displacement at start-up. When the oil volume of this pump is used for rock drilling, the pressure reducing valve 8 acts through the reversing valve 9; Lower the pressure. Pump 2 is used to manually adjust the flow and is used for the rotating circuit. Its flow can be adjusted manually, and the adjustment range is 0 ~ 106lmin-1. When rock drilling, the working pressure of the rotating circuit is adapted to the pressure required to resist the rotating resistance, and depends on the rotational speed, the type of drilling tool used and the nature of the rock being drilled. The normal value is usually between 4 and 5 mpa. The safety valve of the rotating circuit is preset to 11.5mpa to protect the rotating circuit.   2. System failure phenomenon and its maintenance The impactor of the hydraulic rock drill is a high-frequency movement impact mechanism with an impact frequency of 40-60hz. During the movement process, the flow changes in the system are violent unsteady flow, resulting in high-pressure impact and damage to components such as pump valves and hoses. larger. In addition, due to the failure of the seal of the rock drill, a small amount of mineral powder and water enter the oil, which will increase the wear of the rock drill, valve block and cylinder and other components, and the system will be polluted greatly, increasing the probability of system failure. Common fault phenomena and solutions as follows. 2.1. The system shock pressure drops During the working process of the rock drilling rig, the impact pressure gradually decreases, resulting in the phenomenon of pressure drop. This is mainly due to the leakage of the impactor guide piston of the rock drill, the wear of various components of the system, the increase of the gap, the excess leakage itself, and the volumetric efficiency of the high-pressure pump. factors such as decline. Solution: In order to prolong the working period, an appropriate energy storage device can be installed in the shock system to supplement the leakage and absorb the high-pressure shock wave, so as to effectively protect the system and keep the shock pressure stable. The rock drill is an impact mechanism with high frequency and violent motion. Its impact frequency is 40-60hz, and the high pressure shock wave formed generates several times the working pressure. Although the circuit has a safety valve, the rock drill accumulator absorbs part of the shock wave, but most of the pressure wave It acts directly on the pump. Generally speaking, the reversing time of the constant pressure valve is 50-60ms, but the response capacity of the pump is 3-5hz, so the variable of the pump lags far behind the effect of the shock wave of the pump. In rock drilling conditions, the displacement of the pump is generally adjusted to the maximum angle, that is, the position where dead ends are likely to occur, so that although there is a high flow output, at this time the plunger hinged ball sleeve bears a large force, and the wear is increased. , the ball head breaks and cracks fall off, so that the surface of the plunger and the cylinder is scratched, and the volumetric efficiency decreases; the oil distribution plate has the most critical influence on the volumetric efficiency. If the components such as body and constant pressure valve are worn, it will bring great difficulties to the repair work. From the site, the damage degree of the a8v pump is 80% caused by this. The gear speed-increasing mechanism of a8v pump, if the lubrication of the gear is not in place or the wear clearance increases, or the bearing clearance increases, it will cause vibration, the noise of the pump is large, and the output flow pulse is intensified, which will have a certain impact on the pump and system components. The solution is to prevent contamination, regrind the valve plate and replace the pump with a new one. The hydraulic rock drill is the most important executive component of the trolley system. After many experiments and analysis, internal leakage is the main factor affecting its normal operation. In actual use, the impact caused by internal leakage is often ignored. When the test pressure is 11mpa, if the internal leakage of the impact part exceeds 5lmin-1, the impact pressure and impact frequency will decrease. The damping piston should be repaired at this time, and the corresponding inspection should be carried out to reduce the internal leakage of the impact part to 1 ~ 3lmin-1. When the test pressure is 4mpa, the internal leakage of the rotary motor should be controlled within 8lmin-1. However, due to the large flow reserve of the rotary pump, adjusting the flow of the rotary pump can compensate for the influence of leakage in this respect. In actual use, If the pressure of the rotary system exceeds 10mpa, it means that the gear meshing is too tight, the drill rod is stuck in the drilling rig, and the anti-jamming drill valve does not work. Depending on the type, the overhaul period of the cop1038hd type is about the operation time of drilling a 6000m rock hole. Through the test of the four pressure reducing valves in the single-arm system of the trolley, it is found that the average leakage sum is 13lmin-1, and the reasonable total leakage should be less than 4lmin-1. The online test method of this type of pressure regulating valve is to adjust the t The mouth is connected, and the leakage amount is measured with a measuring cup. When the pressure of the impact rotary combined reversing valve is 15mpa, the average total leakage is 3.2lmin-1. The leakage path of the valve is the wear of the reversing valve core, the leakage of the safety valve, and the reverse leakage of the check valve. When the low-flushing valve group is at 25mpa, the average leakage is 0.025lmin-1, and the opening pressure of the relief valve of the valve group of 30 is less than 15mpa, and some even have been opened at 2.5mpa. The on-line test method for the low-stroke valve group can disconnect the pipeline of the hydraulic pump leading to the low-stroke group. If the system pressure rises, the valve group has internal leakage. Therefore, it can be seen that the impact damage of the safety valve spool is relatively serious. The average leakage sum of other hydraulic valve arm positioning reversing valves, apb valves, anti-jamming reversing valves, etc. should not exceed 1lmin-1. From the above test results, it can be seen that the average leakage sum of hydraulic valves in the single-arm system is about 20lmin-1. , In addition, there are 30 check valves in reverse conduction, and the hydraulic lock failure is 20, which will affect the working efficiency of the working system. The repair of the hydraulic valve mainly adopts the method of increasing the valve core, and then matching it with the valve body. If it is a poppet valve spool, it is best to reprocess the spool and grind it with the valve seat. The number of hydraulic cylinders in the trolley system is quite large. From the leakage detection results of the trolley cylinders, it can be seen that the average leakage of the outrigger cylinders, telescopic cylinders, roof cylinders, thruster extension cylinders and other cylinders is very small. The average leakage is 10lmin-1, the average leakage of the gondola cylinder is 12lmin-1, and the average leakage of the propulsion cylinder is 8lmin-1. During the test, it was found that the leakage of the cylinder is mainly concentrated in the regular working section of the cylinder stroke; The leakage of all the cylinders detected is calculated as an average, then the sum of the average leakage of all the cylinders of the single arm is 18lmin-1. There are two main ways to solve the leakage of the oil cylinder. The first method is to replace the oil seal of the oil cylinder piston, but it has little effect on the oil cylinder that leaks in the frequent working section, because the inner diameter of the cylinder in the frequent working section of the oil cylinder is worn. At this time, the method of wear-resistant repair glue is used to restore the inner diameter of the cylinder to the original size. The effect of long-term use is very ideal, especially the slender cylinder with the inner diameter of the cylinder is more superior. 3 The necessity of establishing a professional maintenance team Modern underground mining equipment has tended to be trackless, hydraulic, continuous, diversified in power sources, comprehensive mechanization of auxiliary operations and partial automation of production equipment. After entering the 1990s, electronic computers have been gradually applied to rock drilling rigs, robots and optical fiber communication technology have also begun to be applied in some foreign mines, electronic sensors, smart chips, etc. The use of hydraulic servo mechanism, long-distance tracking and local automation equipment is increasing day by day, and the current rock drill can also realize electronic monitoring and remote control operations. With the improvement of the technical level, the complexity of the system has also increased, and now domestic mining enterprises generally have the problems of poor personnel quality and low management level, so that good equipment cannot play the maximum effect. Therefore, a sound technical service system and professional It is very necessary for the maintenance team to carry out necessary technical training for employees. It is of great significance to reduce the occurrence of failures, improve the service life of the machine and increase the output. Starting from the actual situation of on-site use and referring to a large number of materials, the working principle of the hydraulic system of the simbah252 trolley is systematically and detailedly analyzed. It analyzes and summarizes the common faults of the hydraulic system of the simbah252 rock drilling rig, as well as the reasons for the faults and the treatment methods. The hydraulic system, working principle and structural characteristics of the hydraulic rock drilling rig are discussed in detail and comprehensively, which are worthy of reference, promotion and application in similar mines. Disclaimer: The article is only for learning and communication. If the copyright of the work needs to be deleted by us, please contact us and we will deal with it as soon as possible.

Dragon Boat Festival (one of the four traditional Chinese festivals) Dragon Boat Festival, also known as Duanyang Festival, Dragon Boat Festival, Chongwu Festival, Tianzhong Festival, etc., is a folk festival that integrates worshiping gods and ancestors, praying for blessings and warding off evil spirits, celebrating entertainment and eating. The Dragon Boat Festival originated from the worship of natural celestial phenomena and evolved from the sacrifice of dragons in ancient times. On the Midsummer Dragon Boat Festival, Canglong Qisu flew up to the center of the south, and was in the most "righteous" position throughout the year, just like the fifth line of "Book of Changes Qian Gua": "The flying dragon is in the sky". The Dragon Boat Festival is the auspicious day of "Flying Dragons in the Sky", and the culture of dragons and dragon boats has always run through the inheritance history of the Dragon Boat Festival. The Dragon Boat Festival is a traditional cultural festival popular in China and other countries in the cultural circle of Chinese characters. It is said that Qu Yuan, a poet of Chu State during the Warring States Period, committed suicide by jumping on the Miluo River on the fifth day of the fifth lunar month. Later generations also regarded the Dragon Boat Festival as a festival to commemorate Qu Yuan; Cao E and Jie Zitui, etc. The origin of the Dragon Boat Festival covers ancient astrological culture, humanistic philosophy and other aspects, and contains profound and rich cultural connotations. In the inheritance and development, it is mixed with a variety of folk customs. Due to different regional cultures, there are customs and details in different places. difference.The Dragon Boat Festival, the Spring Festival, the Qingming Festival and the Mid-Autumn Festival are known as the four traditional festivals in China. The Dragon Boat Festival has a wide influence in the world, and some countries and regions in the world also have activities to celebrate the Dragon Boat Festival.

Xi'an Huizhong Machinery Equipment Co., Ltd. will take part in Bauma 2024, one of the world's leading trade fairs for construction machinery, building material machines, mining machines, and construction vehicles. The event, known for showcasing cutting-edge technologies and industry innovations, provides an excellent platform for the company to present its latest rock drilling equipment and solutions. Through its participation, Xi'an Huizhong aims to strengthen industry connections, explore new business opportunities, and demonstrate its commitment to advancing tunneling and mining equipment technology. Visitors can expect to see high-performance machinery, expert insights, and potential collaborations during the exhibition.

The Micangshan Tunnel is currently using a full set of drilling tools from HZJX and rock drill accessories. Xintong three-arm jumbo (DW3-180) and XCMG iron-mounted three-arm jumbo (TZ3A) have been used before and after this construction site. Several domestic companies have been used in the early stage of the construction site. The products of the brazing tool manufacturers were used for comparative testing. After testing, we finally won the trust of the construction site leaders with the highest cost performance, the most stable quality, and the most guaranteed after-sales service.

The structure of hydraulic rock drills is more complex, and there are many reasons for damage to its parts. Based on the hydraulic rock drills used by domestic rock drill rigs, it mainly introduces the common failures of rock drills such as rotation, impact, waterway, air path and sealing, etc., and proposes solutions. Finally, summarizes the precautions for the use of hydraulic rock drills. matter. Hydraulic rock drill is a kind of rock drilling construction sharp tool, with impact, rotary, propulsion and washing and other functions, used for hole or bolt hole construction. １ Rock drill composition Domestic rock drilling rig manufacturers use hydraulic rock drills for drilling construction. Their rock drills are high-pressure small-flow or low-pressure large-flow percussive rock drills, which consist of the impact part, the middle part, the hydraulic stop part and the front part (see Figure 1). The impact part has a high-pressure zone and a low-pressure zone. The middle part of the rock drill is mainly a centering and centralizing part. The hydraulic stop part has the functions of turning and hitting parts. The front part of the rock drill mainly provides centralizing support for the rotating impact of the shank. ▲ Figure 1 schematic diagram of hydraulic rock drill 2 Classification and solution of common faults 2.1 Slewing Problems 2.1.1 Rock drill rotary stuck (1) The spool of the logical sequence valve of the rotary oil inlet of the drill is blocked due to hydraulic oil pollution, which will cause the rotary oil inlet to be blocked and stuck, as shown in Figure 2 (a). The solution to this problem is to remove the spool and clean it with diesel oil. ▲ Figure 2 Different types of rotation lag (2) The rotary parts of the drill are damaged, such as rotary bearing and gear, as shown in Fig.2 (b), (c) and (d). Failure of components is usually caused by insufficient lubrication or fatigue. Sufficient lubrication is a necessary condition for rotary bushing to maintain good performance. Lubrication requirements should be timely improved for high propulsion force and large hole diameter. Inadequate lubrication can cause high-temperature discoloration around the end face of the bushing and, in severe cases, can cause the rotating bushing to break in two and even cause costly secondary damage to the drill. Rotary bushings are wear-resistant parts and should generally be replaced after 400 impact hours of operation to prevent damage due to part fatigue. 2.1.2 Return the drill half turn The rock drill stops rotating after turning part of the Angle, and a similar phenomenon occurs in the reverse rotation. The reason for this phenomenon is that the rock drill is stuck in rotation due to inconsistent torque of the fixing bolts of the rock drill body. 2.2 Impact Problems 2.2.1 The rock drilling is weak and the drilling efficiency decreases The rock drill is weak and its efficiency decreases, which is mainly manifested as serious jitter of the impact pressure gauge on the cab panel and tubing of propeller boom. The main reason is insufficient nitrogen in the high-pressure or low-pressure nitrogen zone of the rock drill or damage of nitrogen diaphragm, which needs to be replaced or filled with nitrogen, as shown in FIG. 3. When such faults are serious, the accumulator end cover may crack, resulting in nitrogen leakage. ▲ Figure 3 Replacing nitrogen diaphragm   2.2.2 Rock drilling without impact The rock drilling rotation is normal and the impact pressure gauge is normal, but there is no impact. The reasons are as follows: (1) The impact stop valve of the rear cover of the drill is stuck due to hydraulic oil pollution, and can be used after cleaning, as shown in FIG. 4 (a). (2) The impact stop valve of the rear cover of the rock drill is broken, mainly because the lag pressure of the card is large, which leads to its damage. In this case, the impact stop valve needs to be replaced, as shown in Fig.4 (b) ▲ Figure 4 Different drilling conditions without impact 2.2.3 There is sound when drilling rock impact The drilling rotation is normal, and the impact pressure gauge is normal, but there is no impact, and there is a rattling sound when the impact. Most of these problems are caused by the failure of the impact piston part, such as the impact piston fracture, stuck lag, or the impact guide piston stuck lag. Inconsistent torque of rock drill will lead to eccentric impact piston, the rock drill is not maintained in time (the copper sleeve at the front end of the rock drill and the copper spline sleeve in the head of the rock drill are seriously worn and not replaced in time) or the lack of gas lubrication will lead to foreign matter entering the impact piston, resulting in partial scratches of the impact piston. The damage of different components is shown in Figure 5. ▲ Figure 5 Damage of different components 2.2.4 Rock drilling is difficult to find holes with low impact and almost no advance The main reason for the difficulty in drilling with low punch and almost no advance is the damage of the drill tail ring, as shown in FIG. 6 (a) and (b), which leads to the difficulty in opening holes. If the brazing tail ring is damaged too frequently, it is because the clearance is large due to high low punching pressure and serious wear of copper sleeve, as shown in FIG. 6 (c) and (d), the brazing tail is not in alignment. At this time, it is necessary to measure and check the size of copper sleeve for verification and replacement. 2.3 Waterway problems 2.3.1 The washing head of the drill is broken The main reason for the water leakage caused by the rupture of the washing head is that the backbeat or impact is carried out in the absence of propulsion. Two other reasons are as follows: (1) The washing head is corroded. This is because the material used to make the wash head cannot be fully strong and corrosion-resistant. If the wash water used is acid-base corrosive, the wash head material may become corroded, which can cause cracks (see Figure 7 (a)) and eventually fatigue failure. The only way to improve this situation is to keep the brazing tail, flush head seal and connection plate in good condition. ▲ Figure 7 Rock drill washing head fracture (2) Front end is corroded. If the front end is corroded, the flush head will move forward and the impact force from the stop ring will be transmitted to the connection plate rather than to the connection thread of the front end bolt as expected, which will result in an adverse stress distribution around the opening at the front end of the connection plate, resulting in a rupture (see Figure 7 (b)). Brazing tail, water sealing ring and connecting plate are in good condition to effectively avoid front-end corrosion. In the actual drilling operation, try to eliminate the use of impact in the case of low propulsion or no propulsion force, especially high impact, which is also one of the effective measures to improve the service life of the washing head. 2.3.2 Spider marks are obvious on impact piston The internal rust of the rock drill is serious, and the crack source of the end face of the rock drill piston is clear. This phenomenon will cause the end face of the rock drill piston to be damaged in advance, and the life of the rock drill piston cannot reach the predetermined design value. The main reason is that the water seal of the rock drill is not replaced in time, and the water in the rock drill is repeatedly quenched in the strike area, resulting in the crack source. Damage of spider marks on impact piston is shown in FIG. 8.   3 Matters needing attention when using hydraulic drill (1) The driller shall check the accumulator pressure frequently before the driller. The high-pressure accumulator shall be 3 ~ 4MPa lower than the opening pressure, and the maximum is 11MPa; Low pressure accumulator 2 ~ 2.5mpa. (2) reduce air strike, reverse strike, eliminate the total impact, in the actual drilling operation as far as possible to eliminate the use of impact in the case of low propulsion or no propulsion force, can not use high impact. (3) Check the damage degree of brazing tail, flushing head seal and connecting plate state regularly, and replace vulnerable parts such as water seal in time. (4) Check the damaged tightening force of side bolts and rear cover bolts regularly. (5) regularly (generally every 400 impact hours) replace the seal, copper sleeve, bearing, three rib sleeve, brazing ring and other fragile and consumable parts, regularly check the copper sleeve, three rib sleeve and other outer clearance, regularly check the preload of bearings and other parts. (6) Ensure smooth and sufficient gas lubrication, and ensure that the gas lubricating oil type is correct, sufficient lubrication is the necessary condition for rotating contact parts (rotating bushing, copper bushing, brazing ring, three-rib sleeve and impact piston, etc.) to maintain good performance.

For 300 drill pipes of MMT38H35R32*4.305 and MF RD T45*1.525, it only took 20 days from purchasing raw materials, production and processing, quality testing, packing and warehousing.