Hydraulic rock drill with rotary energy recycling function and comprehensive test system of the hydraulic rock drill

Abstract

The application discloses a rotary energy recycling hydraulic rock drill comprehensive test system and a comprehensive test test bed with the same, which comprises a rock drill test system, a rotary loading system and an impact vibration absorbing system. The rock drill test system comprises a measured rock drill and a test oil supply circuit, and the test oil supply circuit supplies oil to an impact piston and a rotary motor respectively. The impact vibration absorbing system is connected with a drill tail to supply hydraulic oil to absorb the impact energy of the drill tail. The rotary loading system comprises a loading gearbox, a loading motor and a loading overflow valve, the loading overflow valve is used for adjusting the pressure of the rotary loading system to be equal to the pressure of the impact vibration absorbing system, so that the oil outlet of the high-pressure side of the loading motor directly enters the impact vibration absorbing system to supply oil, and meanwhile, the loading motor changes the displacement to ensure the loading torque requirement. The system can comprehensively test the impact and rotation of the rock drill, the power of the rotary loading system can be maximally used to drive the impact vibration absorbing system, and the efficient use of energy is realized.

Description

Technical Field

[0001] This invention relates to the field of hydraulic rock drill technology, and in particular, to a comprehensive testing system for hydraulic rock drills that utilizes rotational energy. Furthermore, this invention also relates to a comprehensive testing bench that includes the aforementioned comprehensive testing system for hydraulic rock drills that utilizes rotational energy. Background Technology

[0002] Hydraulic rock drills, as a type of rock drilling equipment that uses high-pressure oil to drive a piston to impact the drill bit and has an independent rotary mechanism, play a crucial role in tunnel drilling construction. Their working principle is that high-pressure oil, through a precision reversing valve inside the cylinder, drives the impact piston 11 to achieve efficient reciprocating motion within the front and rear guide sleeves. This motion then impacts the drill bit, and the powerful impact energy is transmitted to the rock through the connecting sleeve, drill rod, and drill bit. Simultaneously, the drilling rotary motor 12 drives the drill bit to rotate, thus creating a rock-breaking effect on the rock surface through a combination of impact and rotation. Hydraulic rock drills, with their advantages of high drilling speed, low power consumption, high energy utilization, and large impact energy, have become the preferred tool for tunnel drilling construction.

[0003] However, hydraulic rock drills have a relatively complex structure. To ensure that key parameters such as impact performance and rotation performance meet factory standards, rigorous testing is required before shipment. Traditional testing methods typically involve drilling into concrete piles, but this method has significant limitations: due to the relatively fixed load, the impact and rotation testing range of the rock drill is limited, resulting in incomplete performance testing; furthermore, although there are some test benches specifically designed for hydraulic rock drills on the market, most only test a single performance characteristic such as rotation or drilling, without testing the overall performance of the rock drill; and due to the pure power loss of the rotation loading circuit, the entire test bench operates at high power, generates significant heat, and wastes energy considerably. If hydraulic loading is used, the hydraulic oil temperature will rise even faster, requiring a more powerful cooling system and exacerbating system power loss.

[0004] To address the aforementioned issues, existing technology CN116928177A, "An Energy Recovery System and Method for Performance Testing of Hydraulic Rock Drills," connects the rock drill's output to a loading gearbox and a loading motor. Torque loading of the rock drill is achieved by adjusting the parameters of a frequency converter. The DC power generated by the loading motor and converted by the frequency converter is then used to drive the main pump motor again via a DC bus, thus achieving energy recovery. However, this solution only tests the rock drill's rotational performance, neglecting its impact performance. The test content is relatively simple, and the loading method using the loading motor involves multiple energy conversions during energy recovery. The conversion components are costly, and significant energy loss is inevitable during the conversion process, resulting in a low energy recovery utilization rate.

[0005] In existing technology CN107327430A, "A Hydraulic Integrated Testing System for Power Recovery," the output ends of the motor and reducer under test are connected to the loading reducer and loading motor. Loading is achieved through a bridge-type circuit overflow valve. High-pressure oil in the loading circuit is recovered and drives a power recovery motor via a control valve group. The power recovery motor is rigidly connected to the main oil pump. By changing the displacement to match the pressure of the loading overflow valve, the power recovery motor drives the main oil pump to rotate, achieving the purpose of power recovery. This scheme can significantly reduce the power consumption of the test bench, but the energy recovery system is relatively complex, involves multiple energy conversions, numerous components, and has a high cost. Furthermore, the conversion process inevitably involves significant energy loss, resulting in low energy recovery utilization. Because the power recovery motor is rigidly connected to the main pump, high requirements are placed on the displacement control technology of the power recovery motor. Summary of the Invention

[0006] This invention provides a comprehensive testing system for hydraulic rock drills that reuses rotational energy, as well as a comprehensive testing bench with the same, to solve the technical problems of existing testing benches, such as limited impact and rotational testing range of rock drills, resulting in incomplete performance testing, lack of comprehensive performance testing of rock drills, high operating power, severe heat generation, and serious energy waste.

[0007] The technical solution adopted in this invention is as follows:

[0008] A comprehensive testing system for hydraulic rock drills that utilizes rotary energy includes a rock drill testing system, a rotary loading system, and an impact vibration absorption system. The rock drill testing system includes a rock drill under test and a test oil supply circuit connected to the rock drill. The test oil supply circuit supplies oil to the impact piston and rotary motor of the rock drill under test, respectively, to allow the drill bit to impact and rotate. The impact vibration absorption system is connected to the drill bit to supply hydraulic oil to absorb the impact energy of the drill bit. The rotary loading system includes a loading gearbox, a loading motor, and a loading relief valve. The loading gearbox is connected to the drill bit to apply torque loading to the drill bit under the action of the loading motor and the loading gearbox. The high-pressure side oil outlet of the loading motor is also connected to the impact vibration absorption system. The loading relief valve is used to adjust the pressure of the rotary loading system to be equal to the pressure of the impact vibration absorption system, thereby allowing the high-pressure side oil outlet of the loading motor to directly enter the impact vibration absorption system for oil supply. Simultaneously, the displacement of the loading motor is changed to ensure that the loading torque requirements are met.

[0009] Furthermore, the rotary loading system also includes a coupling for connecting to the drill bit and a rotary loading oil circuit for supplying oil to the loading motor; the loading gearbox is connected to the coupling, and the loading motor is connected to the loading gearbox; the rotary loading oil circuit is connected to the high-pressure side and low-pressure side of the loading motor and the impact vibration absorption system, for supplying oil to the low-pressure side of the loading motor, while introducing the oil outlet from the high-pressure side of the loading motor into the impact vibration absorption system; and the loading relief valve is connected to the rotary loading oil circuit and the impact vibration absorption system.

[0010] Furthermore, the rotary loading oil circuit includes a first oil supply pipe, a first hydraulic pump connected to the oil inlet end of the first oil supply pipe, a first relief valve connected to the first oil supply pipe, a bridge circuit connected to the oil outlet end of the first oil supply pipe, and a first check valve; the bridge circuit is connected to the low-pressure side and high-pressure side of the loading motor and the impact vibration absorption system respectively; the first check valve is installed in the pipeline connecting the bridge circuit and the impact vibration absorption system;

[0011] Furthermore, the rotary loading oil circuit also includes a first pressure sensor, which is installed in the pipeline connecting the loading relief valve to the bridge circuit and the impact vibration absorption system; the rotary loading system also includes a torque sensor and a speed sensor respectively connected to the loading gearbox.

[0012] Furthermore, the impact vibration absorption system includes a vibration absorption cylinder for absorbing impact energy, a vibration absorption oil supply circuit for supplying oil to the vibration absorption cylinder, and a vibration absorption return oil circuit for returning oil to the vibration absorption cylinder; the oil outlet of the bridge circuit is connected to the vibration absorption oil supply circuit; the two ends of the loading overflow valve are respectively connected to the bridge circuit and the vibration absorption return oil circuit, and the return oil of the vibration absorption return oil circuit is connected to the oil tank.

[0013] Furthermore, the vibration-absorbing oil supply circuit includes a second oil supply pipe, a second hydraulic pump connected to the oil inlet end of the second oil supply pipe, and a second relief valve, a sixth check valve, and a second pressure sensor connected in the second oil supply pipe. The oil outlet end of the second oil supply pipe is connected to the vibration-absorbing cylinder. The vibration-absorbing return oil circuit includes a first return oil pipe connecting the vibration-absorbing cylinder and the oil tank, and a radiator installed in the first return oil pipe.

[0014] Furthermore, the vibration-absorbing oil supply circuit also includes an accumulator connected to the second oil supply pipe.

[0015] Furthermore, the test oil supply circuit includes a third hydraulic pump for pumping oil and an electro-proportional multi-way valve for distributing hydraulic oil; the oil outlet of the electro-proportional multi-way valve is connected to the oil inlet and outlet of the impact piston, and the high-pressure side and low-pressure side of the rotary motor, respectively.

[0016] Furthermore, the test oil supply circuit also includes a third and fourth pressure sensor for measuring system pressure, a first and second flow meter for measuring system flow, and a shuttle valve for measuring the high-pressure oil drawn from the rotary motor; the first flow meter and the third pressure sensor are sequentially installed in the pipeline connecting the impact piston and the electro-proportional multi-way valve; the second flow meter is installed in the oil circuit connecting the rotary motor and the electro-proportional multi-way valve; the two ends of the shuttle valve are respectively connected to the two pipelines on the high-pressure side and the low-pressure side of the rotary motor; and the fourth pressure sensor is connected to the shuttle valve.

[0017] According to another aspect of the present invention, a comprehensive test bench is also provided, which has a comprehensive test system for hydraulic rock drills that utilizes rotational energy as described above.

[0018] The present invention has the following beneficial effects:

[0019] This invention proposes a comprehensive testing system for hydraulic rock drills that reuses rotational energy. This system is primarily used to comprehensively test the impact and rotational performance of hydraulic rock drills. The test oil supply circuit supplies oil to the impact piston and rotational motor of the rock drill under test to drive its movement. The drill bit's shank is connected to a loading gearbox and an impact vibration absorption system. The loading gearbox is connected to a loading motor, thereby driving the loading motor to rotate through the impact vibration absorption system and the shank's impact. The loading motor, supplied with oil by the rotation loading system and acting in conjunction with the loading gearbox, applies torque to the drill bit to simulate the rotational force experienced during actual operation, thus achieving a comprehensive test of the rock drill's impact and rotational performance. Simultaneously, when the loading motor is operating, the oil output from the high-pressure side directly enters the impact vibration absorption system to absorb the impact vibration. The system supplies oil, thereby using the rotational energy that would otherwise be lost to supply oil to the impact vibration absorption system. This achieves the recovery of rotational energy and reduces the power loss of the motor loading circuit. By controlling the loading overflow valve, the pressure of the rotary loading system is made equal to that of the impact vibration absorption system. At the same time, the displacement of the loading motor is changed to ensure that the loading torque requirements are met. Therefore, when the loading motor is loading, the oil from the high-pressure side can enter the impact vibration absorption system almost without loss, allowing the power of the rotary loading system to drive the impact vibration absorption system to the maximum extent. This significantly reduces the operating power of the entire test system and achieves efficient energy utilization. Furthermore, since the oil from the loading motor directly enters the impact vibration absorption system without additional energy recovery components, the energy recovery system is simpler, has fewer energy conversion cycles, higher recovery efficiency, and lower recovery costs.

[0020] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 This is an energy transfer block diagram of a hydraulic rock drill integrated testing system for the reuse of rotary energy according to a preferred embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of a hydraulic rock drill integrated testing system for the reuse of rotary energy, according to a preferred embodiment of the present invention.

[0024] Legend:

[0025] 1. The rock drill under test; 11. Impact piston; 12. Rotary motor;

[0026] 2. Test the oil supply circuit; 21. Third hydraulic pump; 22. Electro-proportional multi-way valve; 221. First proportional directional valve; 222. First proportional relief valve; 223. Second proportional directional valve; 224. Second first proportional relief valve; 225. Second second proportional relief valve; 23. Third pressure sensor; 24. Fourth pressure sensor; 25. First flow meter; 26. Second flow meter; 27. Shuttle valve; 28. Third relief valve;

[0027] 31. Loading the gearbox; 32. Loading the motor; 33. Loading the relief valve; 34. Coupling; 35. Torque sensor; 36. Speed ​​sensor;

[0028] 4. Rotary loading oil circuit; 41. First hydraulic pump; 42. First relief valve; 431. Second check valve; 432. Third check valve; 433. Fourth check valve; 434. Fifth check valve; 44. First check valve; 45. First pressure sensor;

[0029] 5. Impact vibration absorption system; 51. Vibration absorption cylinder; 52. Second hydraulic pump; 53. Second relief valve; 54. Sixth check valve; 55. Second pressure sensor; 56. Radiator; 57. Accumulator;

[0030] 61. Fuel tank; 62. Prime mover. Detailed Implementation

[0031] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0032] Reference Figure 1-2A preferred embodiment of the present invention provides a comprehensive testing system for a hydraulic rock drill that reuses rotational energy, comprising a rock drill testing system, a rotational loading system, and an impact and vibration absorption system 5. The rock drill testing system includes a rock drill under test 1 and a test oil supply circuit 2 connected to the rock drill under test 1. The test oil supply circuit 2 supplies oil to the impact piston 11 and the rotational motor 12 of the rock drill under test 1, respectively, so that the drill bit of the rock drill under test 1 impacts and rotates. The impact and vibration absorption system 5 is connected to the drill bit to supply hydraulic oil to absorb the impact energy of the drill bit. The rotary loading system includes a loading gearbox 31, a loading motor 32, and a loading relief valve 33. The loading gearbox 31 is connected to the drill bit and is used to apply torque to the drill bit under the action of the loading motor 32 and the loading gearbox 31. The high-pressure side oil outlet of the loading motor 32 is also connected to the impact vibration absorption system 5. The loading relief valve 33 is used to adjust the pressure of the rotary loading system to be equal to the pressure of the impact vibration absorption system 5, so that the high-pressure side oil outlet of the loading motor 32 can directly enter the impact vibration absorption system 5 for oil supply. At the same time, the displacement of the loading motor 32 is changed to ensure that the loading torque requirements are met.

[0033] This invention proposes a comprehensive testing system for hydraulic rock drills that reuses rotational energy. This system is primarily used to comprehensively test the impact and rotational performance of hydraulic rock drills. The test oil supply circuit 2 supplies oil to the impact piston 11 and rotational motor 12 of the rock drill under test 1 to drive its operation. The drill bit shank of the rock drill under test 1 is connected to a loading gearbox 31 and an impact vibration absorption system 5. The loading gearbox 31 is connected to a loading motor 32, thereby driving the loading motor 32 to rotate through the impact vibration absorption system 5. The loading motor 32, through the oil supply from the rotation loading system and in conjunction with the loading gearbox 31, applies torque to the drill bit shank to simulate the rotational force experienced during actual operation, thus achieving a comprehensive test of the rock drill's impact and rotational performance. Simultaneously, the oil output from the high-pressure side of the loading motor 32 directly enters the impact vibration absorption system 5 to... Oil is supplied to the impact vibration absorption system 5, thereby using the rotational energy that would otherwise be lost to supply oil to the impact vibration absorption system 5, so as to realize the recovery of rotational energy and reduce the power loss of the motor loading circuit. By controlling the loading overflow valve 33, the pressure of the rotary loading system is made equal to the pressure of the impact vibration absorption system 5. At the same time, the displacement of the loading motor 32 is changed to ensure that the loading torque requirement is met. Therefore, when the loading motor 32 is loading, the oil from the high-pressure side can enter the impact vibration absorption system 5 almost without loss for oil supply, so that the power of the rotary loading system can drive the impact vibration absorption system 5 to the maximum extent, thereby significantly reducing the operating power of the entire test system and realizing the efficient use of energy. Since the oil from the loading motor 32 directly enters the impact vibration absorption system 5 without additional energy recovery elements, the energy recovery system is simple, has fewer energy conversion times, high recovery efficiency, and low recovery cost.

[0034] Optionally, such as Figure 2As shown, the rotary loading system also includes a coupling 34 for connection to the drill bit and a rotary loading oil circuit 4 for supplying oil to the loading motor 32. The loading gearbox 31 is connected to the coupling 34, and the loading motor 32 is connected to the loading gearbox 31. The rotary loading oil circuit 4 connects the high-pressure side and low-pressure side of the loading motor 32 to the impact vibration absorption system 5, supplying oil to the low-pressure side of the loading motor 32 while simultaneously introducing the oil outlet from the high-pressure side of the loading motor 32 into the impact vibration absorption system 5. The loading relief valve 33 connects the rotary loading oil circuit 4 and the impact vibration absorption system 5. In this optional scheme, the rock drill under test 1 is the target test rock drill. The impact piston 11 is used for rock drill impact, and the rotary motor 12 is used for rock drill rotation. This scheme allows for testing of different models of rock drills by adjusting parameters. The loading gearbox 31 changes the transmission ratio and, in conjunction with the loading motor 32, applies torque to the rock drill under test 1. The loading motor 32 simulates a rotary load, providing the required rotary torque to the rock drill under test 1. The loading motor 32 is an electro-proportional variable displacement motor; its displacement can be changed via a control signal. When the pressure difference between its high and low pressure sides is constant, the torque of the loading motor 32 can be changed to meet the loading torque requirements. Where T is the motor torque (Nm), P is the pressure difference between the inlet and outlet of the high and low pressure sides of the motor (bar), and V is the motor displacement (Ml / r); the function of the loading relief valve 33 is to work with the loading motor 32 to simulate the load. By changing the relief pressure value, the rotation torque can be changed. The loading relief valve 33 is an electro-proportional relief valve.

[0035] In this optional solution, such as Figure 2 As shown, the rotary loading oil circuit 4 includes a first oil supply pipe, a first hydraulic pump 41 connected to the oil inlet of the first oil supply pipe, a first relief valve 42 connected in the first oil supply pipe, a bridge circuit connected to the oil outlet of the first oil supply pipe, and a first check valve 44. The bridge circuit is connected to the low-pressure side and high-pressure side of the loading motor 32 and the impact vibration absorption system 5, respectively. The first check valve 44 is located in the pipeline connecting the bridge circuit and the impact vibration absorption system 5. In this optional scheme, the function of the first hydraulic pump 41 is to provide replenishment oil to the loading motor 32 to ensure sufficient hydraulic oil in the rotary loading oil circuit 4. The first hydraulic pump 41 can be a fixed displacement pump or a variable displacement pump; the first relief valve 42 is the outlet safety valve of the first hydraulic pump 41, used to ensure that the rotary loading system does not overpressure; the first check valve 44 is used to allow the pressure oil in the loading circuit to flow unidirectionally into the impact vibration absorption system 5 to avoid cross-pressure.

[0036] In specific embodiments of this optional solution, such as Figure 2As shown, the bridge circuit includes a second check valve 431, a third check valve 432, a fourth check valve 433, and a fifth check valve 434 connected sequentially. Each of the four pairs of valves connects to the high-pressure and low-pressure sides of the loading motor 32, the first hydraulic pump 41, and the impact and vibration absorption system 5, respectively. The bridge circuit functions to replenish oil to the low-pressure side of the loading motor 32 with the first hydraulic pump 41 and to apply load to the high-pressure side of the loading motor 32 with the loading relief valve 33.

[0037] Furthermore, such as Figure 2 As shown, the rotary loading oil circuit 4 also includes a first pressure sensor 45, which is installed in the pipeline connecting the loading overflow valve 33 to the bridge circuit and the impact vibration absorption system 5, for detecting the pressure in the loading circuit. The rotary loading system also includes a torque sensor 35 and a speed sensor 36, which are respectively connected to the loading gearbox 31; the torque sensor 35 is used to detect the rotary torque of the rock drill 1 under test in real time, and the speed sensor 36 is used to detect the speed of the rock drill 1 under test in real time.

[0038] Preferably, in this invention, the pressure oil in the rotary loading circuit can be used as a pressure oil source to drive the operation of other actuators in the system, thereby achieving energy recovery and utilization.

[0039] Optionally, such as Figure 1 and Figure 2 As shown, the impact vibration absorption system 5 includes a vibration absorption cylinder 51 for absorbing impact energy, a vibration absorption oil supply circuit for supplying oil to the vibration absorption cylinder 51, and a vibration absorption return oil circuit for returning oil to the vibration absorption cylinder 51. The oil outlet of the bridge circuit is connected to the vibration absorption oil supply circuit. The two ends of the loading overflow valve 33 are respectively connected to the bridge circuit and the vibration absorption return oil circuit, and the return oil of the vibration absorption return oil circuit is connected to the oil tank 61. In this optional scheme, the vibration absorption cylinder 51 is used as the counter cylinder of the impact piston 11 of the rock drill 1 under test, absorbing the impact energy transmitted by the rock drill 1 under test. When the impact pressure changes, the inlet pressure of the vibration absorption cylinder 51 needs to be adjusted accordingly in order to absorb the corresponding impact energy.

[0040] In this optional solution, such as Figure 2As shown, the vibration-damping oil supply circuit includes a second oil supply pipe, a second hydraulic pump 52 connected to the oil inlet end of the second oil supply pipe, and a second relief valve 53, a sixth check valve 54, and a second pressure sensor 55 connected in the second oil supply pipe. The oil outlet end of the second oil supply pipe is connected to the vibration-damping cylinder 51. The vibration-damping return oil circuit includes a first return oil pipe connecting the vibration-damping cylinder 51 and the oil tank 61, and a radiator 56 installed in the first return oil pipe. In this optional scheme, the second hydraulic pump 52 is used to supply oil to the vibration-absorbing cylinder 51. The second hydraulic pump 52 is a variable pump, preferably with an electro-proportional pressure regulation function, so as to adjust the inlet pressure of the vibration-absorbing cylinder 51 when the impact pressure changes. The second relief valve 53 is the outlet safety valve of the second hydraulic pump 52, used to ensure that the system does not overpressure. The second pressure sensor 55 is used to detect the pressure of the vibration-absorbing circuit. The radiator 56 is used to absorb the hydraulic oil in the vibration return oil circuit to ensure that the hydraulic oil in the system does not get too hot. The sixth check valve 54 is used to allow the pressure oil from the second hydraulic pump 52 and the loading circuit to flow unidirectionally into the vibration-absorbing circuit to avoid cross-pressure.

[0041] Preferably, such as Figure 2 As shown, the vibration-absorbing oil supply circuit also includes an accumulator 57 connected to the second oil supply pipe. The accumulator 57 is used to reduce the pressure fluctuation of the vibration-absorbing oil supply circuit, maintain the system pressure relatively stable, and also play a role in improving the response frequency of the vibration-absorbing circuit.

[0042] Optionally, such as Figure 2 As shown, the test oil supply circuit 2 includes a third hydraulic pump 21 for pumping oil, a third relief valve 28, and an electro-proportional multi-way valve 22 for distributing hydraulic oil. The oil outlet of the electro-proportional multi-way valve 22 is connected to the oil inlet and outlet of the impact piston 11, and the high-pressure side and low-pressure side of the rotary motor 12, respectively. In this optional scheme, the third hydraulic pump 21 is used to supply oil to the impact piston 11 and the rotary motor 12 of the rock drill under test 1, driving the rock drill under test 1 to move. The third hydraulic pump 21 is a fixed displacement pump, or it can be a variable displacement pump; the third relief valve 28 is the outlet safety valve of the third hydraulic pump 21, used to ensure that the system does not overpressure.

[0043] like Figure 2 As shown, the electro-proportional multi-way valve 22 is used to distribute the high-pressure oil from the third hydraulic pump 21 to supply oil to the impact piston 11 and the rotary motor 12 respectively. The electro-proportional multi-way valve 22 has the functions of proportionally regulating the flow rate and proportionally regulating the load pressure, ensuring that the impact pressure, impact flow rate, rotary pressure and rotary flow rate parameters of the rock drill 1 under test are proportionally adjustable. The first proportional directional valve 221 is used to control the impact flow rate of the rock drill 1 under test, and the first proportional relief valve 222 is used to control the impact pressure of the rock drill 1 under test. The second proportional directional valve 223 is used to control the rotary flow rate of the rock drill 1 under test, the second first proportional relief valve 224 is used to control the reverse pressure of the rock drill 1 under test, and the second second proportional relief valve 225 is used to control the forward pressure of the rock drill 1 under test.

[0044] In this optional solution, such as Figure 2 As shown, the test oil supply circuit 2 also includes a third pressure sensor 23 and a fourth pressure sensor 24 for measuring system pressure, a first flow meter 25 and a second flow meter 26 for measuring system flow, and a shuttle valve 27 for measuring the high-pressure oil supplied to the rotary motor 12. The first flow meter 25 and the third pressure sensor 23 are sequentially installed in the pipeline connecting the impact piston 11 and the electro-proportional multi-way valve 22. The second flow meter 26 is installed in the oil circuit connecting the rotary motor 12 and the electro-proportional multi-way valve 22. The two ends of the shuttle valve 27 are connected to the high-pressure side and the low-pressure side pipelines of the rotary motor 12, respectively. The fourth pressure sensor 24 is connected to the shuttle valve 27. The function of the flow meter is to detect the system flow in real time. The first flow meter 25 is used to detect the impact flow of the rock drill 1 under test, and the second flow meter 26 is used to detect the rotation flow of the rock drill 1 under test. The first hydraulic pump 41, the second hydraulic pump 52 and the third hydraulic pump 21 are all connected to the prime mover 62, which provides the power source. The function of the pressure sensor is to detect the system pressure in real time. The third pressure sensor 23 is used to detect the impact pressure of the rock drill 1 under test, and the fourth pressure sensor 24 is used to detect the rotation pressure of the rock drill 1 under test. The function of the shuttle valve 27 is to lead out the high-pressure oil of the rotary motor 12 of the rock drill 1 under test for detection by the fourth pressure sensor 24.

[0045] The testing process for the rock drill 1 under test is as follows:

[0046] Idle Phase: The prime mover 62 starts, driving the third hydraulic pump 21, the first hydraulic pump 41, and the second hydraulic pump 52 to rotate. At this time, the first hydraulic pump 41 outputs pressurized oil, which enters the high-pressure side and low-pressure side of the loading motor 32 through the second check valve 431 and the third check valve 432 of the bridge circuit. This pressure is used to ensure that the loading motor 32 can replenish oil in time when it is running. The second hydraulic pump 52 outputs pressurized oil according to the set pressure and supplies oil to the vibration absorption circuit through the sixth check valve 54. The second pressure sensor 55 detects the pressure of the vibration absorption circuit in real time. The third hydraulic pump 21 outputs pressurized oil, which enters the electro-proportional multi-way valve 22. The first proportional directional valve 221 and the first proportional relief valve 222 of the electro-proportional multi-way valve 22 are connected to the... According to the control signal output corresponding flow and pressure control, the impact piston 11 of the rock drill 1 under test starts to impact. The drill bit is connected to the vibration absorption cylinder 51 through the coupling 34, and the output impact energy is transmitted to the vibration absorption cylinder 51 for absorption. Since the vibration absorption cylinder 51 will cause vibration absorption pressure fluctuation after absorbing the impact, and in order to improve the response frequency of the vibration absorption cylinder 51, the accumulator 57 is used to reduce pressure fluctuation and improve response frequency. At the same time, the second proportional directional valve 223 and the second first proportional relief valve 224 of the electro-proportional multi-way valve 22 output corresponding flow according to the control signal, and control the rotary motor 12 of the rock drill 1 under test to start to rotate forward. At this time, the loading relief valve 33 is not energized, and the rotary motor 12 drives the loading motor 32 to run unloaded.

[0047] Loading Phase: When the rotary motor 12 requires torque loading, the controller first adjusts the pressure of the loading relief valve 33 based on the pressure value of the vibration absorption circuit detected by the second pressure sensor 55, ensuring that the set pressure of the loading relief valve 33 is consistent with the pressure of the second pressure sensor 55. Then, the controller controls the displacement control coil of the loading motor 32 to control the displacement of the loading motor 32 accordingly, so that the torque sensor 35 and the set torque value are constant, and the rotary motor 12 loads torque as required. At this time, the low-pressure side of the loading motor 32 is supplied by the first hydraulic pump 41 through the second check valve 431 (assuming...). Figure 2 The upper port of the loading motor 32 shown is the low-pressure side, and the lower port is the high-pressure side. Oil is replenished. The high-pressure oil on the high-pressure side is supplied to the vibration absorption circuit through the fifth check valve 434 and the first check valve 44. Since the pressure of the rotary loading circuit and the vibration absorption circuit are the same, the high-pressure oil of the rotary loading circuit can enter the vibration absorption circuit without loss, so as to achieve the purpose of efficient utilization of the loading rotary energy.

[0048] Loading Change: When the test impact pressure of the rock drill 1 changes or a different model of rock drill 1 is tested, the oil inlet pressure of the vibration absorption cylinder 51 needs to be changed accordingly. If the test impact energy increases, the second hydraulic pump 52 increases the set pressure to meet the system pressure requirements. When the pressure of the second pressure sensor 55 increases, the controller synchronously increases the pressure value of the loading overflow valve 33 to ensure that the rotary loading pressure continues to be consistent with the vibration absorption circuit pressure. To ensure that the test torque of the rotary motor 12 remains unchanged, the displacement of the loading motor 32 is reduced accordingly. If the test impact energy decreases, the second hydraulic pump 52 decreases the set pressure to meet the system pressure requirements. When the pressure of the second pressure sensor 55 decreases, the controller synchronously decreases the pressure value of the loading overflow valve 33 to ensure that the rotary loading pressure continues to be consistent with the vibration absorption circuit pressure. To ensure that the test torque of the rotary motor 12 remains unchanged, the displacement of the loading motor 32 is increased accordingly. At the same time, by collecting the parameters of each sensor, the parameters of the rock drill 1 under different working conditions can be analyzed to achieve the comprehensive performance test of the rock drill 1.

[0049] When the rotary motor 12 is loaded, since the pressure of the loading overflow valve 33 controlled by the controller is consistent with the pressure of the vibration absorption circuit, the high-pressure oil of the rotary loading circuit enters the vibration absorption circuit through the first check valve 44 with almost no loss, and drives the vibration absorption cylinder 51 as a power source, so as to achieve efficient utilization of the energy of the loading circuit. At this time, the second hydraulic pump 52 adaptively reduces the operating power, thereby reducing the operating power of the whole machine.

[0050] Reference Figure 1-2The preferred embodiment of the present invention also provides a comprehensive test bench with a comprehensive test system for hydraulic rock drills that recycles rotational energy as described above. Thus, the comprehensive test bench of the present invention can not only perform comprehensive testing of the impact and rotation of the rock drill, but also, when the loading motor 32 is working, the oil output from the high-pressure side directly enters the impact vibration absorption system 5 to supply oil to the impact vibration absorption system 5. This utilizes the rotational energy that would otherwise be lost to supply oil to the impact vibration absorption system 5, thereby achieving the recovery of rotational energy and reducing the power loss of the motor loading circuit. Furthermore, due to the loading overflow valve... The function of 33 is to make the pressure of the rotary loading system equal to the pressure of the impact vibration absorption system 5. Therefore, when the loading motor 32 loads, the oil from the high-pressure side can enter the impact vibration absorption system 5 almost without damage for oil supply. This allows the power of the rotary loading system to drive the impact vibration absorption system 5 to the maximum extent, thereby significantly reducing the operating power of the entire test bench and achieving efficient energy utilization. Furthermore, since the oil from the loading motor 32 directly enters the impact vibration absorption system 5 without additional energy recovery elements, the energy recovery system is simpler, has fewer energy conversion cycles, higher recovery efficiency, and lower recovery costs.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A comprehensive testing system for a hydraulic rock drill that reuses rotary energy, characterized in that, Including rock drill testing system, rotary loading system and impact vibration absorption system (5); The rock drill testing system includes a rock drill under test (1) and a test oil supply circuit (2) connected to the rock drill under test (1). The test oil supply circuit (2) is used to supply oil to the impact piston (11) and the rotary motor (12) of the rock drill under test (1) respectively, so that the drill bit of the rock drill under test (1) can impact and rotate. The impact absorption system (5) is connected to the drill bit to supply hydraulic oil to absorb the impact energy of the drill bit; The rotary loading system includes a loading gearbox (31), a loading motor (32), and a loading relief valve (33). The loading gearbox (31) is connected to the drill bit and is used to apply torque to the drill bit under the action of the loading motor (32) and the loading gearbox (31). The high-pressure side oil outlet of the loading motor (32) is also connected to the impact vibration absorption system (5). The loading relief valve (33) is used to adjust the pressure of the rotary loading system to be equal to the pressure of the impact vibration absorption system (5), so that the high-pressure side oil outlet of the loading motor (32) directly enters the impact vibration absorption system (5) for oil supply. At the same time, the loading motor (32) changes the displacement to ensure that the loading torque requirement is met. The rotary loading system also includes a coupling (34) for connecting to the drill bit and a rotary loading oil circuit (4) for supplying oil to the loading motor (32); the loading gearbox (31) is connected to the coupling (34), and the loading motor (32) is connected to the loading gearbox (31); the rotary loading oil circuit (4) is connected to the high-pressure side and low-pressure side of the loading motor (32) and the impact vibration absorption system (5) for supplying oil to the low-pressure side of the loading motor (32) and introducing the oil outlet from the high-pressure side of the loading motor (32) into the impact vibration absorption system (5); the loading relief valve (33) is connected to the rotary loading oil circuit (4) and the impact vibration absorption system (5). The rotary loading oil circuit (4) includes a first oil supply pipe, a first hydraulic pump (41) connected to the oil inlet end of the first oil supply pipe, a first relief valve (42) connected to the first oil supply pipe, a bridge circuit connected to the oil outlet end of the first oil supply pipe, and a first check valve (44); the bridge circuit is connected to the low-pressure side and high-pressure side of the loading motor (32) and the impact vibration absorption system (5) respectively; the first check valve (44) is set in the pipeline connecting the bridge circuit and the impact vibration absorption system (5); The shock absorption system (5) includes a shock absorption cylinder (51) for absorbing shock energy, a shock absorption oil supply circuit for supplying oil to the shock absorption cylinder (51), and a shock absorption return oil circuit for returning oil to the shock absorption cylinder (51); the oil outlet of the bridge circuit is connected to the shock absorption oil supply circuit; the two ends of the loading overflow valve (33) are respectively connected to the bridge circuit and the shock absorption return oil circuit, and the return oil of the shock absorption return oil circuit is connected to the oil tank (61).

2. The comprehensive testing system for hydraulic rock drills with rotary energy reuse according to claim 1, characterized in that, The rotary loading oil circuit (4) also includes a first pressure sensor (45), which is located in the pipeline connecting the loading relief valve (33) to the bridge circuit and the impact vibration absorption system (5); The rotary loading system also includes a torque sensor (35) and a speed sensor (36) respectively connected to the loading gearbox (31).

3. The comprehensive testing system for hydraulic rock drills utilizing rotary energy according to claim 2, characterized in that, The vibration damping oil supply circuit includes a second oil supply pipe, a second hydraulic pump (52) connected to the oil inlet end of the second oil supply pipe, and a second relief valve (53), a sixth check valve (54) and a second pressure sensor (55) connected to the second oil supply pipe. The oil outlet end of the second oil supply pipe is connected to the vibration damping cylinder (51). The vibration damping return oil circuit includes a first return oil pipe connecting the vibration damping cylinder (51) and the oil tank (61), and a radiator (56) installed in the first return oil pipe.

4. The comprehensive testing system for hydraulic rock drills utilizing rotary energy according to claim 2, characterized in that, The vibration-absorbing oil supply circuit also includes an accumulator (57) connected to the second oil supply pipe.

5. The comprehensive testing system for hydraulic rock drills utilizing rotary energy according to claim 1, characterized in that, The test oil supply circuit (2) includes a third hydraulic pump (21) for pumping oil and an electro-proportional multi-way valve (22) for distributing hydraulic oil. The oil outlet of the electro-proportional multi-way valve (22) is connected to the oil inlet and outlet of the impact piston (11), and the high-pressure side and low-pressure side of the rotary motor (12), respectively.

6. The comprehensive testing system for hydraulic rock drills utilizing rotary energy according to claim 5, characterized in that, The test oil supply circuit (2) also includes a third pressure sensor (23) and a fourth pressure sensor (24) for measuring system pressure, a first flow meter (25) and a second flow meter (26) for measuring system flow, and a shuttle valve (27) for measuring the high-pressure oil drawn from the rotary motor (12). The first flow meter (25) and the third pressure sensor (23) are sequentially installed in the pipeline connecting the impact piston (11) and the electro-proportional multi-way valve (22); The second flow meter (26) is installed in the oil circuit where the rotary motor (12) and the electro-proportional multi-way valve (22) are connected; The two ends of the shuttle valve (27) are respectively connected to the two pipelines on the high-pressure side and the low-pressure side of the rotary motor (12); The fourth pressure sensor (24) is connected to the shuttle valve (27).

7. A comprehensive testing bench, characterized in that, A comprehensive testing system for hydraulic rock drills that utilizes rotational energy as described in any one of claims 1-6.

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