A rock drill test bench

Abstract

The application discloses a rock drill test bed, which comprises a reduction gearbox and an energy absorber connected with a first sensor, the reduction gearbox is connected with a drill rod, the drill rod is connected with a simulated drill bit arranged correspondingly with the energy absorber, the energy absorber comprises a hydraulic cylinder connected with a hydraulic accumulator, a hydraulic rod is arranged in the hydraulic cylinder, the hydraulic rod divides the hydraulic cylinder into a nitrogen cavity and a hydraulic oil cavity, the hydraulic rod is extended from the hydraulic oil cavity, a rock drill to be tested is connected with the reduction gearbox, the simulated drill bit in a working state rotates or knocks on the hydraulic rod, and the first sensor detects the stress of the energy absorber. The rock drill test bed can simulate the advancing resistance, rotating resistance and impact breaking resistance of rocks generated in the rock drilling process of a rock drilling jumbo, and the response capability is improved by using nitrogen energy absorption.

Description

Technical Field

[0001] This application relates to the field of rock drilling rig testing, and in particular to a rock drilling machine test bench. Background Technology

[0002] A rock drill is a tool used to directly extract stone. It drills holes in rock strata to insert explosives to blast the rock, thereby completing the extraction of stone or other rock excavation projects. In addition, rock drills can also be modified into breakers to crush hard layers such as concrete. Rock drills play an important role in national economic development and are essential equipment for rock drilling and blasting in mining, transportation, hydropower, and national defense construction projects. Its performance parameters have a significant impact on the construction effect, especially the impact energy, which directly determines the construction efficiency.

[0003] Due to the high frequency and high impact energy of rock drills, improper operation can easily cause irreversible damage to the drill and equipment. This necessitates a highly complex hydraulic system for the rock drilling rig, with numerous debugging points. Therefore, rock drilling rigs must be tested within the factory. However, the harsh on-site environmental conditions in mines, tunnels, and blast furnace areas make it difficult to conduct factory inspections of hydraulic rock drills on-site. Instead, simulation tests must be performed as closely as possible to the actual on-site working conditions.

[0004] Traditional rock drilling rig tests include the following methods: 1. Using cement blocks for rock drilling tests. This method is low-cost, but because it differs significantly from the rock's parameters, it fails to achieve ideal test results and can easily damage the rock drill due to dry drilling. 2. Using quartzite blocks for rock drilling tests. This method is inconvenient to transport and store, costly, and has the disadvantage of being disposable. 3. Using a traditional rock drilling rig test bench, which uses ordinary propulsion cylinders and rotary brakes to simulate propulsion and rotational loads, and springs to absorb impact loads. The disadvantages are short service life, high wear and tear, and frequent maintenance.

[0005] Relevant patents, such as the Chinese patent application "Reliability Test Bench for Hydraulic Rock Drills" (application number: CN201010109716.7), disclose a test bench with horizontal sliding guide rails installed on it. A sliding plate is fitted onto the guide rails, and opposing propulsion cylinders and hydraulic spring cylinders are fixed to the test bench at both ends of the sliding plate's movement direction. The piston rods of the propulsion cylinders are connected to the sliding plate, and the hydraulic rock drill to be tested is mounted on the sliding plate, with the drill bit of the test drill facing the piston rod of the hydraulic spring cylinder. Alternatively, a hydraulic rock drill for impact testing, with the directional valve core removed or fixed, can be used instead of a hydraulic spring cylinder. An internal channel connects the test drill to the side water inlet of the impact hydraulic rock drill, and a high-pressure air pump is connected to the side water inlet of the test drill. This invention utilizes a hydraulic spring cylinder or an impact hydraulic rock drill to press the drill bit of the test hydraulic rock drill, effectively functioning as a hydraulic spring cylinder. Prolonged high-frequency impact actions will not cause damage to the machine body.

[0006] For example, the Chinese patent application "A Vertical Test Stand for Testing the Performance of Rock Drills", application (patent) number: CN201720935093.6, discloses a structure including a base, a column fixed to the upper part of the base, a rotating arm and platform set in the middle of the column, and a winch device located at the top of the column. An energy absorber is set on the left side of the column, the rotating arm is located at the lower part of the platform, a propulsion device is fixed at one end of the rotating arm, a tubular guide hammer device is fixed at the other end of the rotating arm, and a pneumatic system is set in the middle of the rotating arm. This vertical test stand for testing the performance of rock drills can test the performance of rock drills and impact tools of various powers and calibrate their parameters.

[0007] Existing technologies using old structures like springs for energy absorption are inefficient, generate excessive heat, and are prone to fatigue and breakage. Furthermore, the impact frequency of rock drills is typically around 60Hz, which the springs cannot keep up with, easily causing the rock drill to dry-drill and resulting in damage. Summary of the Invention

[0008] The technical problem to be solved by this application is to provide a rock drill test bench that can simulate the propulsion resistance, rotational resistance and impact crushing resistance generated by the rock during the rock drilling process of the rock drilling rig, and improves the response capability by using nitrogen energy absorption.

[0009] The technical solution adopted in this application is as follows: a rock drill test bench, including a reduction gearbox and an energy absorber connected to a first sensor. The reduction gearbox is connected to a drill rod, and the drill rod is connected to a simulated drill bit corresponding to the energy absorber. The energy absorber includes a hydraulic cylinder connected to a hydraulic accumulator. A hydraulic rod is installed inside the hydraulic cylinder. The hydraulic rod divides the hydraulic cylinder into a nitrogen chamber and a hydraulic oil chamber. The hydraulic rod extends out from the hydraulic oil chamber. The rock drill to be tested is connected to the reduction gearbox. The simulated drill bit in working condition rotates or strikes on the hydraulic rod. The first sensor detects the force on the energy absorber.

[0010] Compared with existing technologies, the advantages of this application are as follows: the impact energy of the rock drill accounts for approximately 80% of the total output energy of the machine. This application incorporates nitrogen energy absorption within the hydraulic cylinder of the energy absorber. During the rock drill's forward stroke, the impact energy is converted into compressed nitrogen energy; during the rock drill's return stroke, the compressed nitrogen energy is released and pushed out. Compared to traditional spring-like structures, the energy absorber of this application improves responsiveness and prevents damage to the rock drill due to dry drilling. The energy absorber of this application has a fast response speed, enabling full contact between the test device and the drill bit. Furthermore, the hydraulic cylinder connected to a hydraulic accumulator has a long service life and high efficiency.

[0011] This application provides a drill rod connected to the gearbox, which is connected to a simulated drill bit. The simulated drill bit and the hydraulic rod are set separately, which can prevent damage to the hydraulic cylinder when the rock drill rotates.

[0012] In some embodiments of this application, the simulated drill bit is equipped with a cooling water passage connected to coolant. Furthermore, the cooling water passage is connected to the cooler of the rock drill. While cooling the simulated drill bit, the cooling water passage can also drain water from the rock drill's water cooler, increasing the continuous testing time.

[0013] In some embodiments of this application, the gearbox is provided with a shaft hole that is adapted to the drill bit structure of the rock drill. Specifically, the gearbox is provided with a hexagonal shaft hole, allowing the drill bit of the rock drill to be directly connected to the gearbox, thus improving testing efficiency. Preferably, the gearbox used in this application is the same as the gearbox used in the rock drill, ensuring consistent and synchronized pressure feedback, and providing better and more intuitive feedback on the rotational load.

[0014] In some embodiments of this application, the gearbox is connected to a motor, and the rotation of the rock drill drives the motor to rotate passively.

[0015] This application also includes a first gear pump, which is connected to a drive motor. The drive motor provides power to the first gear pump.

[0016] The first gear pump is connected to the first chamber of the motor via a one-way check valve, and the first gear pump is connected to the second chamber of the motor via a first overflow valve and a balance valve.

[0017] The hydraulic oil output from the first gear pump passes through the first relief valve and the balance valve to the second chamber of the motor. The first gear pump and the first relief valve replenish the motor in the gearbox, extending the motor's lifespan. The first relief valve sets the pressure of the rotary oil replenishment system to prevent air cavitation damage to the motor. A higher pressure setting on the balance valve results in a larger rotating load and more severe rock conditions simulated in this application.

[0018] The hydraulic oil output from the motor is delivered to the first gear pump via a one-way check valve. The one-way check valve effectively prevents the rock drill motor from reversing.

[0019] Furthermore, the motor is connected to a second sensor. The second sensor detects the motor pressure in real time.

[0020] Furthermore, this application also includes an air cooler, which is configured correspondingly to the balance valve. During use, the balance valve converts the energy of the rock drill's rotation into heat in the hydraulic oil, which is ultimately dissipated through the air cooler.

[0021] In some embodiments of this application, the energy absorber is connected to a propulsion cylinder. The propulsion cylinder provides thrust to the energy absorber, causing the simulated drill bit and the energy absorber to fit tightly together.

[0022] The propulsion cylinder includes a third chamber and a fourth chamber, with the fourth chamber connected to the second gear pump.

[0023] The third chamber of the propulsion cylinder is connected to the second gear pump via a one-way throttle valve. The second gear pump outputs hydraulic oil to the fourth chamber of the propulsion cylinder. The hydraulic oil output from the third chamber of the propulsion cylinder is then delivered to the second gear pump via the one-way throttle valve, which regulates the flow rate of the hydraulic oil. Specifically, the second gear pump is connected to a drive motor, which provides power to the second gear pump.

[0024] The second gear pump outputs hydraulic oil to the propulsion hydraulic cylinder, enhancing its response speed. When the rock drilling rig's propulsion load acts on the propulsion cylinder, it retracts, and the hydraulic oil in the cylinder flows through a one-way throttle valve to the second gear pump. This one-way throttle valve acts as a flow regulator simulating rock hardness; the smaller the throttle opening, the higher the simulated rock hardness.

[0025] The second gear pump is connected to the second overflow valve. The second overflow valve adjusts the oil supply pressure so that the propulsion cylinder can effectively and completely ensure a tight fit between the simulated drill bit and the impact energy absorber.

[0026] The first sensor is connected to the energy absorber via the propulsion cylinder. The first sensor records the pressure passively generated by the propulsion cylinder in real time.

[0027] In some embodiments of this application, the application includes a propulsion beam on which the rock drill to be tested is placed, and the propulsion beam controls the propulsion amount of the rock drill.

[0028] This application includes a test bench, on which the propulsion cylinder, energy absorber, and gearbox are sequentially mounted. A middle drill bit holder and a front drill bit holder are also provided on the test bench, spaced apart. The drill bit of the test rock drill passes sequentially through the front and middle drill bits before connecting to the gearbox. The purpose of the front and middle drill bits is to protect the drill bit from bending.

[0029] Based on common knowledge in the field, the above-described embodiments can be combined arbitrarily. Attached Figure Description

[0030] The present application will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0031] Figure 1 This is a side view of the application in its usage state;

[0032] Figure 2 This is a top view showing the usage status of this application;

[0033] Figure 3 This is a schematic diagram of this application.

[0034] The specific reference numerals in the attached drawings are explained as follows: 1. Drive motor; 2. First gear pump; 3. Gearbox; 4. Motor; 5. Second sensor; 6. One-way check valve; 7. Balance valve; 8. First overflow valve; 9. Second gear pump; 10. Second overflow valve; 11. One-way throttle valve; 12. First sensor; 13. Propulsion cylinder; 14. Energy absorber; 15. Drill rod; 16. Test rock drill; 17. Propulsion beam; 18. Air cooler; 19. Simulated drill bit; 20. Front drill support; 21. Middle drill support. Detailed Implementation

[0035] The present application will now be described in detail with reference to the accompanying drawings.

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0037] A rock drill test bench, such as Figure 1 , Figure 2 The device includes a reduction gearbox 3 and an energy absorber 14 connected to a first sensor 12. The reduction gearbox 3 is connected to a drill rod 15, which is connected to a simulated drill bit 19 corresponding to the energy absorber 14. The energy absorber 14 includes a hydraulic cylinder connected to a hydraulic accumulator. A hydraulic rod is installed inside the hydraulic cylinder, dividing it into a nitrogen chamber and a hydraulic oil chamber. The hydraulic rod extends from the hydraulic oil chamber. This application uses nitrogen energy absorption within the hydraulic cylinder of the energy absorber 14. When the rock drill strikes forward, the impact energy is converted into compressed nitrogen energy. When the rock drill returns, the compressed nitrogen energy is released and pushed out. Compared to traditional spring structures, the energy absorber 14 of this application improves responsiveness and avoids damage to the rock drill due to dry drilling. The energy absorber 14 of this application has a fast response speed, allowing for full contact between the test device and the drill bit. Furthermore, the hydraulic cylinder connected to the hydraulic accumulator has a long service life and high efficiency.

[0038] The rock drill to be tested is connected to the gearbox 3. The simulated drill bit 19, in working condition, rotates or strikes on the hydraulic rod, and the first sensor 12 detects the force on the energy absorber 14. This application provides a chisel 15 connected to the gearbox 3, and the chisel 15 is connected to the simulated drill bit 19. The simulated drill bit 19 and the hydraulic rod are set separately, which can avoid damage to the hydraulic cylinder when the rock drill rotates.

[0039] The simulated drill bit 19 is equipped with a cooling water channel connected to coolant. Furthermore, the cooling water channel is connected to the cooler of the rock drill. While cooling the simulated drill bit 19, the cooling water channel can also drain water from the rock drill's cooler, increasing the continuous testing time.

[0040] This application includes a propulsion beam 17, on which the rock drill to be tested is placed, and the propulsion beam controls the propulsion amount of the rock drill.

[0041] This application includes a test bench, on which a propulsion cylinder 13, an energy absorber 14, and a reduction gearbox 3 are sequentially mounted. A middle drill bit holder 21 and a front drill bit holder 20 are also provided on the test bench, spaced apart. The drill bit of the test rock drill 16 passes sequentially through the front drill bit holder 20 and the middle drill bit holder 21 before connecting to the reduction gearbox 3. The purpose of providing the front drill bit holder 20 and the middle drill bit holder 21 in this application is to protect the drill bit from bending.

[0042] Example 2, as Figures 1 to 3 As shown, the reduction gearbox 3 is provided with a shaft hole, which is adapted to the drill bit structure of the rock drill. Specifically, the reduction gearbox 3 is provided with a hexagonal shaft hole, allowing the drill bit of the rock drill to be directly connected to the reduction gearbox 3, thus improving testing efficiency. Preferably, the reduction gearbox 3 used in this application is the same as the reduction gearbox 3 used inside the rock drill, ensuring consistent and synchronized pressure feedback, and providing better and more intuitive feedback on the rotational load.

[0043] The gearbox 3 is connected to the motor 4, and the rotation of the rock drill drives the motor 4 to rotate passively.

[0044] This application also includes a first gear pump 2, which is connected to a drive motor 1. The drive motor 1 provides power to the first gear pump 2.

[0045] The first gear pump 2 is connected to the first chamber of the motor 4 through the one-way check valve 6, and the first gear pump 2 is connected to the second chamber of the motor 4 through the first overflow valve 8 and the balance valve 7.

[0046] The hydraulic oil output from the first gear pump 2 flows through the first relief valve 8 and the balance valve 7 to the second chamber of the motor 4. The first gear pump 2 and the first relief valve 8 replenish the oil supply to the motor 4 in the reduction gearbox 3, extending the service life of the motor 4. The first relief valve 8 sets the pressure of the rotary oil replenishment system to prevent air cavitation damage to the motor 4. A higher pressure setting on the balance valve 7 results in a larger rotary load and more severe rock conditions simulated in this application.

[0047] The hydraulic oil output from the motor 4 is delivered to the first gear pump 2 through the one-way check valve 6. The one-way check valve 6 effectively prevents the rock drill motor 4 from reversing.

[0048] Furthermore, the motor 4 is connected to a second sensor 5. The second sensor 5 detects the pressure of the motor 4 in real time.

[0049] Furthermore, this application also includes an air cooler 18, which is correspondingly configured with the balance valve 7. During use, the balance valve 7 converts the energy of the rock drill's rotation into heat in the hydraulic oil, which is ultimately dissipated through the air cooler 18.

[0050] The rest of the contents of Example 2 are the same as those of Example 1.

[0051] Example 3, as Figures 1 to 3 As shown, the energy absorber 14 is connected to the propulsion cylinder 13. The propulsion cylinder 13 provides thrust to the energy absorber 14, causing the simulated drill bit 19 and the energy absorber 14 to fit tightly together.

[0052] The propulsion cylinder 13 includes a third chamber and a fourth chamber, with the fourth chamber connected to the second gear pump 9.

[0053] The third chamber of the propulsion cylinder 13 is connected to the second gear pump 9 via a one-way throttle valve 11. The second gear pump 9 outputs hydraulic oil to the fourth chamber of the propulsion cylinder 13. The hydraulic oil output from the third chamber of the propulsion cylinder 13 is delivered to the second gear pump 9 via the one-way throttle valve 11, which can adjust the flow rate of the hydraulic oil. Specifically, the second gear pump 9 is connected to the drive motor 1, and the drive motor 1 provides power to the second gear pump 9.

[0054] The second gear pump 9 outputs hydraulic oil to the propulsion hydraulic cylinder, enhancing the response speed of the propulsion cylinder 13. When the rock drilling rig's propulsion load acts on the propulsion cylinder 13, the propulsion cylinder 13 retracts, and the hydraulic oil in the propulsion cylinder 13 passes through the one-way throttle valve 11 to the second gear pump 9. The one-way throttle valve 11 is a flow regulator that simulates rock hardness; the smaller the opening of the one-way throttle valve 11, the higher the simulated rock hardness.

[0055] The second gear pump 9 is connected to the second overflow valve 10. The second overflow valve 10 adjusts the oil supply pressure so that the propulsion cylinder 13 can effectively and completely ensure that the simulated drill bit 19 and the impact energy absorber 14 are in close contact.

[0056] The first sensor 12 is connected to the energy absorber 14 via the propulsion cylinder 13. The first sensor 12 records the pressure passively generated by the propulsion cylinder 13 in real time.

[0057] The other contents of Example 3 are the same as those of Example 1 or Example 2.

[0058] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A rock drill test bench, characterized in that Including the reduction gearbox (3) and the energy absorber (14) connected with the first sensor (12), the reduction gearbox (3) is connected with the drill rod (15), the drill rod (15) is connected with the analog drill bit (19) arranged correspondingly with the energy absorber (14), the energy absorber (14) includes the hydraulic cylinder connected with the hydraulic accumulator, the hydraulic cylinder is mounted with the hydraulic rod, the hydraulic rod divides the hydraulic cylinder into the nitrogen cavity and the hydraulic oil cavity, the hydraulic rod is stretched out from the hydraulic oil cavity, the rock drill to be tested is connected with the reduction gearbox (3), the working state analog drill bit (19) rotates or knocks on the hydraulic rod, the first sensor (12) detects the force of the energy absorber (14); The reduction gearbox (3) is connected with the motor (4), and the rock drill rotates to drive the motor (4) to be passively rotated; Further comprising a first gear pump (2), the first gear pump (2) is connected with the driving motor (1); the first gear pump (2) is connected with the first cavity of the motor (4) through the one-way check valve (6), the first gear pump (2) is connected with the second cavity of the motor (4) through the first overflow valve (8) and the balance valve (7); the output hydraulic oil of the first gear pump (2) passes through the first overflow valve (8) and the balance valve (7) to the second cavity of the motor (4); the output hydraulic oil of the motor (4) is delivered to the first gear pump (2) through the one-way check valve (6).

2. A rock drill test bench according to claim 1, characterized in that The analog drill bit (19) is provided with a cooling waterway, the cooling waterway is connected with cooling liquid; the cooling waterway is connected with the cooler of the rock drill.

3. A rock drill test bench according to claim 1, characterized in that The reduction gearbox (3) is provided with a shaft hole, the shaft hole is adapted to the drill structure of the rock drill.

4. A rock drill test bench according to claim 1, characterized in that The motor (4) is connected with the second sensor (5); the second sensor (5) detects the pressure of the motor (4) in real time.

5. A rock drill test bench according to claim 1, characterized in that The energy absorber (14) is connected with the propelling oil cylinder (13); the propelling oil cylinder (13) includes a third cavity and a fourth cavity, and the fourth cavity is connected with the second gear pump (9).

6. A rock drill test bench according to claim 5, characterized in that The third cavity of the propelling oil cylinder (13) is connected with the second gear pump (9) through the one-way throttle valve (11), the second gear pump (9) outputs hydraulic oil to the fourth cavity of the propelling oil cylinder (13), the output hydraulic oil of the third cavity of the propelling oil cylinder (13) is delivered to the second gear pump (9) through the one-way throttle valve (11), and the one-way throttle valve (11) can adjust the flow of the hydraulic oil.

7. A rock drill test bench according to claim 1, characterized in that It includes a propelling beam (17), the rock drill to be tested is placed on the propelling beam, and the propelling beam controls the propelling amount of the rock drill.

8. A rock drill test bench according to claim 5, characterized in that It includes a test bench, the propelling oil cylinder (13), the energy absorber (14) and the reduction gearbox (3) are sequentially installed on the test bench top; the test bench top is further provided with a middle drill holder (21) and a front drill holder (20), the middle drill holder (21) and the front drill holder (20) are arranged at intervals, the drill of the test rock drill (16) sequentially passes through the front drill holder (20), the middle drill holder (21) and is connected with the reduction gearbox (3).

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