A buffer hydraulic control system for a strong frame machine

Abstract

The application discloses a buffer hydraulic control system of a strong ramming machine arm support, which comprises a hydraulic source, a variable-amplitude balance control device assembly connected with the hydraulic source and used for driving the arm support to lift through a hydraulic motor, an oil cylinder tracking control valve group in communication with the hydraulic source, and an arm support oil cylinder in communication with an output end of the oil cylinder tracking control valve group, wherein the arm support oil cylinder is connected between the arm support of the strong ramming machine and an anti-tilt rod, the anti-tilt rod is hinged on the strong ramming machine, and an accumulator is further connected on a connecting pipeline between the output end of the oil cylinder tracking control valve group and the arm support oil cylinder. The arm support and the oil cylinder can be improved in action coordination, and the operation convenience can be improved through the combination of the oil cylinder tracking control valve group and the accumulator. The arm support oil cylinder controlled by the oil cylinder tracking control valve group is used for buffering the arm support, the response is fast, and the sustained real-time follow-up work can be realized.

Description

Technical Field

[0001] This invention relates to the field of construction equipment technology, and more specifically, to a buffer pressure control system for a dynamic compaction machine boom. Background Technology

[0002] When the hammer is raised, the boom of a dynamic compaction machine sways due to sudden load changes; when the hammer is released from its hook at high altitude, the release of potential energy also causes the boom to rebound and sway. To address the stability issues of the dynamic compaction machine under these conditions, the following methods are currently used to buffer and prevent swaying of the boom: 1. Using mechanical springs for buffering; 2. Using a double-acting hydraulic cylinder system. When using mechanical springs, only unidirectional buffering is possible. When the hammer is raised, the boom tilts downwards due to the hammer's pull, and there is a tendency for it to lose contact with the spring. At this time, the spring cannot provide reverse resistance to prevent the boom from swaying. While using a double-acting hydraulic cylinder system, the coordination between the boom and cylinder movements is poor, requiring separate execution, making operation more cumbersome and inconvenient. For example, the invention patent with publication number CN102720179A discloses a device and a dynamic compaction machine to prevent the boom of a dynamic compaction machine from swaying. The invention installs a buffer cylinder between the main boom and the A-frame to buffer the swaying of the main boom and increase the service life of the equipment. However, it does not solve the problem of poor coordination between the boom and the cylinder, making operation more cumbersome and inconvenient. Summary of the Invention

[0003] When using a dual-acting hydraulic cylinder system to solve the problem of boom swaying in a dynamic compaction machine, the coordination between the boom and the hydraulic cylinder is poor, requiring separate execution, which makes the operation more cumbersome and inconvenient. To overcome this defect, this invention provides a buffer pressure control system for the boom of a dynamic compaction machine, which can improve the coordination between the boom and the hydraulic cylinder and enhance the ease of operation.

[0004] The technical solution of this invention is: a hydraulic buffer pressure control system for a dynamic compaction machine boom, comprising a hydraulic source and a variable amplitude balance control device assembly connected to the hydraulic source and driven by a hydraulic motor to raise and lower the boom. It also includes a cylinder tracking control valve group connected to the hydraulic source and a boom cylinder connected to the output end of the cylinder tracking control valve group. The boom cylinder is connected between the boom of the dynamic compaction machine and an anti-tilt bar, which is hinged to the dynamic compaction machine. An accumulator is also connected to the connecting pipeline between the output end of the cylinder tracking control valve group and the boom cylinder. The cylinder tracking control valve group is an integrated multi-functional control valve assembly, possessing functions such as driving the boom cylinder, stabilizing oil pressure, and energy saving. Through key control by the accumulator, on the one hand, it automatically replenishes energy when the boom raises the hammer on the ground, maintaining the real-time rigidity of the boom; on the other hand, when the hammer is released during the operation of the dynamic compaction machine, the released energy is absorbed by the accumulator, causing the accumulator pressure to rise instantaneously, thus playing a buffering and shock-absorbing role. Therefore, the present invention can solve the problem of boom rebound caused by instantaneous potential energy release by combining the hydraulic cylinder tracking control valve group and the accumulator.

[0005] Preferably, the cylinder tracking control valve group includes an electromagnetic unloading valve connected to the hydraulic power source and a hydraulic control valve connected to the hydraulic output end of the luffing balance control device assembly and the boom cylinder. The hydraulic control valve is also connected to the output end of the cylinder tracking control valve group and the hydraulic power source. A pressure sensor is connected to the connecting pipeline between the hydraulic control valve and the boom cylinder. When the system boom is not working, the electromagnetic unloading valve unloads the hydraulic power source, achieving energy saving. The hydraulic control valve conducts when it receives the driving force output from the luffing balance control device assembly, realizing power output to the boom cylinder; when the hydraulic control valve is not working, it realizes the load holding function of the hydraulic buffer pressure control system of this dynamic compaction machine. The pressure sensor can provide an alarm prompt for the minimum safe pressure of the pressure holding system to ensure system safety.

[0006] Preferably, the cylinder tracking control valve assembly also includes an internal relief valve. The input ends of the solenoid unloading valve and the internal relief valve are connected in parallel on the connecting pipeline between the hydraulic control valve and the hydraulic power source. The internal relief valve is used to maintain the pressure stability of the cylinder tracking control valve assembly, ensuring that the boom can be raised and lowered under stable pressure.

[0007] Preferably, the connection channel between the hydraulic output end of the amplitude-variable balance control device assembly and the hydraulic control valve is a damping orifice. The damping orifice allows the hydraulic pressure output from the amplitude-variable balance control device assembly to be smoothly transmitted to the cylinder tracking control valve group, achieving a smooth switching of the hydraulic control valve's operating state and reducing shock.

[0008] Preferably, a safety valve is also connected to the output end of the hydraulic control valve. The safety valve can protect the boom from damage in real time when the cylinder tracking control valve group fails, ensuring the reliability and safety of the equipment.

[0009] Preferably, a reversing valve is also provided between the hydraulic power source and the luffing balance control device assembly. The inlet of the reversing valve is connected to the hydraulic power source, and the reversing valve has two outlets, which are connected one-to-one with two bidirectional oil ports on the luffing balance control device assembly. The hydraulic motor in the luffing balance control device assembly requires forward and reverse rotation, and the reversing valve can output power to the luffing balance control device assembly in alternating directions.

[0010] Preferably, the hydraulic output end of the luffing balance control device assembly is alternately connected to the bidirectional oil port. While driving the boom to lift and lower, the luffing balance control device assembly also obtains hydraulic driving force from the bidirectional oil port through the hydraulic output end, making the hydraulic output end a parallel output end to the boom lifting main force output end, and controlling the downstream cylinder tracking control valve group.

[0011] Preferably, the hydraulic buffer control system for the boom of this dynamic compaction machine also includes a pilot valve. The pilot valve is connected to the hydraulic power source and has two power output terminals. These power output terminals are connected to the directional valve via pipelines and output power to drive the directional valve to switch directions. The pilot valve converts the power from the hydraulic power source into pilot pressures corresponding to the boom lifting and lowering actions, respectively. Under the action of the pilot pressure, the directional valve completes the switching action and then executes the corresponding control of the boom lifting and lowering actions.

[0012] Preferably, the cylinder tracking control valve assembly also includes a valve block, with the electromagnetic unloading valve and hydraulic control valve installed within the valve block. The cylinder tracking control valve assembly integrates multiple functional control valves within the valve block, resulting in a compact structure, fast response, low leakage, and high control accuracy.

[0013] Preferably, the hydraulic source includes multiple independent hydraulic pumps, with the cylinder tracking control valve group and the luffing balance control device assembly connected one-to-one with two of the hydraulic pumps. The independent operation of multiple hydraulic pumps simplifies the control circuit and reduces mutual interference.

[0014] The beneficial effects of this invention are:

[0015] Easy to operate. This invention improves the coordination between the boom and the cylinder by combining a cylinder tracking control valve group and an accumulator, thus enhancing ease of operation.

[0016] Excellent control and tracking performance. This invention uses a boom cylinder controlled by a hydraulic cylinder tracking control valve group for boom buffering, resulting in a fast response and continuous real-time follow-up operation.

[0017] High safety and reliability. This invention is equipped with protective devices such as safety valves and pressure sensors. The pressure sensor monitors the pressure in real time, and with the energy stored in the accumulator, the pressure sensor can issue an alarm prompt for the minimum safe pressure of the pressure-holding system, ensuring system safety.

[0018] Low maintenance costs. This invention increases boom stability, significantly improves work efficiency, and helps reduce maintenance costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the positional relationship between the boom cylinder and the boom in this invention.

[0020] Figure 2 This is a schematic diagram of a control circuit according to the present invention.

[0021] Figure 3 This is a schematic diagram of a hydraulic cylinder tracking control valve assembly in this invention.

[0022] Figure 4 This is a schematic diagram of the control circuit of the hydraulic cylinder tracking control valve group in this invention.

[0023] In the diagram, 1-hydraulic oil tank, 2-first hydraulic pump, 3-relief valve, 4-pilot valve, 5-second hydraulic pump, 6-directional valve, 7-third hydraulic pump, 8-cylinder tracking control valve group, 9-safety valve, 10-accumulator, 11-luffing balance control device assembly, 12-boom cylinder, 13-pressure sensor, 14-electromagnetic unloading valve, 15-hydraulic control valve, 16-internal relief valve, 17-damping orifice, 18-valve block, 19-boom. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1:

[0026] like Figures 1 to 4 As shown, a hydraulic buffer control system for a dynamic compaction machine boom includes a hydraulic tank 1, a hydraulic power source, a pilot valve 4, a directional valve 6, a luffing balance control device assembly 11, a cylinder tracking control valve group 8, an accumulator 10, and a boom cylinder 12. The hydraulic power source includes a first hydraulic pump 2, a second hydraulic pump 5, and a third hydraulic pump 7, each of which is connected to the hydraulic tank 1. The pilot valve 4 is connected to the first hydraulic pump 2, and an overflow valve 3 is also connected between the pilot valve 4 and the hydraulic tank 1. The pilot valve 4 has two power output terminals, which are connected to the directional valve 6 through pipelines and output hydraulic power to drive the directional valve 6 to switch directions. The second hydraulic pump 5 is connected to the inlet of the directional valve 6 via a pipeline. The directional valve 6 has two outlets, a and b. The luffing balance control assembly 11 is located downstream of the directional valve 6 and consists of a housing, a hydraulic motor, and multiple matching valves. The luffing balance control assembly 11 has two bidirectional oil ports, a' and b', which are used for both oil inlet and outlet to control the forward and reverse rotation of the hydraulic motor. The outlets of the directional valve 6 and the bidirectional oil ports of the luffing balance control assembly 11 are connected one-to-one, allowing the luffing balance control assembly 11 to be indirectly connected to the second hydraulic pump 5 through the directional valve 6. The luffing balance control assembly 11 outputs the hydraulic power provided by the second hydraulic pump 5 through the hydraulic motor, becoming the main power for driving the boom lifting and lowering. The luffing balance control assembly 11 also has a hydraulic output end S, which is alternately connected to ports a' and b' via a shuttle valve, and the hydraulic output end S outputs in parallel with the hydraulic motor.

[0027] The cylinder tracking control valve group 8 is connected to the third hydraulic pump 7. The cylinder tracking control valve group 8 includes a valve block 18, an electromagnetic unloading valve 14, a hydraulic control valve 15, and an internal overflow valve 16. The electromagnetic unloading valve 14, the hydraulic control valve 15, and the internal overflow valve 16 are integrated and installed in the valve block 18. The internal overflow valve 16 is also a liquid orifice. The hydraulic control valve 15 has two parallel ports. The hydraulic control valve 15 switches between two working states. In one working state, the ports become bidirectional open hydraulic inlet and outlet, and in the other working state, the ports become unidirectional hydraulic outlet with only output and no input. The input end of the electromagnetic unloading valve 14 and the input end of the internal overflow valve 16 are connected in parallel to one port of the hydraulic control valve 15. The other port of the hydraulic control valve 15 is connected to the output end of the cylinder tracking control valve group 8. The hydraulic control valve 15 is connected to the hydraulic output end of the luffing balance control device assembly 11. The electromagnetic unloading valve 14 is connected to the third hydraulic pump 7. The hydraulic control valve 15 works simultaneously with the hydraulic motor in the luffing balance control device assembly 11. The valve block 18 is equipped with a hydraulic power source interface P, a luffing balance control device assembly interface K, a boom cylinder interface A, a sensor interface J, a safety valve interface G, a hydraulic control valve return port T1, and a common return port T2 for the electromagnetic unloading valve and the internal relief valve. The hydraulic power source interface P is the input end of the cylinder tracking control valve group 8. The hydraulic power source interface P is connected to the third hydraulic pump 7 through a pipeline. The input ends of the electromagnetic unloading valve 14 and the internal relief valve 16 are also connected to the hydraulic power source interface P through pipelines. The boom cylinder interface A is the output end of the cylinder tracking control valve group 8. The boom cylinder interface A, the safety valve interface G, and the sensor interface J are connected to another port of the hydraulic control valve 15 through pipelines. A pressure sensor 13 is also connected to the pipeline between the boom cylinder interface A and the hydraulic control valve 15. The pressure sensor 13 is installed on the sensor interface J. The output ends of the electromagnetic unloading valve 14 and the internal relief valve 16 are connected to the common return port T2 of the electromagnetic unloading valve and the internal relief valve through pipelines. The hydraulic control valve 15 has an oil drain port that is connected to the hydraulic control valve return port T1. A safety valve 9 is connected to the safety valve interface G.

[0028] The boom cylinder 12 is connected to the boom cylinder interface A via a pipeline, and the luffing balance control device assembly interface K is connected to the hydraulic output end S. The piston rod of the boom cylinder 12 is hinged to the boom 19 of the dynamic compaction machine, and the boom 19 is rotatably connected to the machine body via a rotating shaft. The cylinder body of the boom cylinder 12 is hinged to an anti-tilt bar, which is hinged to an A-frame, which is mounted on the machine body. The accumulator 10 is connected to the pipeline connecting the output end of the cylinder tracking control valve group 8 and the boom cylinder 12. The connection channel between the hydraulic output end of the luffing balance control device assembly 11 and the hydraulic control valve 15 is a damping orifice 17, which can realize the smooth switching of the working state of the hydraulic control valve 15 and reduce impact.

[0029] When the boom 19 needs to be raised, the boom buffer pressure control system of this dynamic compaction machine is activated. The first hydraulic pump 2, the second hydraulic pump 5, and the third hydraulic pump 7 start working, driving the pilot valve 4. The reversing valve 6 reverses under the pilot pressure of the pilot valve 4. The hydraulic motor in the luffing balance control device assembly 11 rotates. The hydraulic motor winds up the wire rope to lift the boom 19. At the same time, the hydraulic output end S synchronously controls the oil cylinder to track the luffing balance control device assembly interface K of the control valve group 8, thereby driving the boom cylinder 12 to start working synchronously with the hydraulic motor. Under the reverse thrust of the raised boom 18, the boom cylinder 12 discharges hydraulic oil in real time, so that the boom 18 maintains a stable pressure during the lifting process. When the boom 19 needs to be lowered, the boom buffer pressure control system of this dynamic compaction machine is activated. The first hydraulic pump 2, the second hydraulic pump 5, and the third hydraulic pump 7 start working, driving the pilot valve 4. The reversing valve 6 reverses under the pilot pressure of the pilot valve 4, and the hydraulic motor in the luffing balance control assembly 11 rotates. The hydraulic motor releases the steel wire rope to drive the boom 19 down. At the same time, the hydraulic output end S synchronously controls the cylinder tracking the luffing balance control assembly interface K of the control valve group 8, thereby driving the boom cylinder 12 to start working synchronously with the hydraulic motor. Under the action of the lowering boom 19, the boom cylinder 12 pushes the piston rod to extend in real time, so that the boom cylinder 12 maintains a stable cylinder pressure during the descent of the boom 18. Through the key control of the accumulator 10, on the one hand, the energy is automatically replenished when the boom 19 is raising the hammer on the ground, maintaining the real-time rigidity of the boom 19; on the other hand, when the hammer is released in the air, the fully released potential energy is absorbed by the accumulator 10, and the pressure of the accumulator 10 increases instantaneously, playing a buffering and shock-absorbing role.

[0030] Example 2:

[0031] A hydraulic buffer control system for a dynamic compaction machine boom includes a hydraulic tank 1, a hydraulic power source, a pilot valve 4, a directional valve 6, a luffing balance control device assembly 11, a cylinder tracking control valve group 8, an accumulator 10, and a boom cylinder 12. The hydraulic power source includes a first hydraulic pump 2, a second hydraulic pump 5, and a third hydraulic pump 7, each of which is connected to the hydraulic tank 1. The pilot valve 4 is connected to the first hydraulic pump 2, and an overflow valve 3 is also connected between the pilot valve 4 and the hydraulic tank 1. The pilot valve 4 has two power output terminals, which are connected to the directional valve 6 through pipelines and output hydraulic power to drive the directional valve 6 to switch directions. The second hydraulic pump 5 is connected to the inlet of the directional valve 6 via a pipeline. The directional valve 6 has two outlets, a and b. The luffing balance control assembly 11 is located downstream of the directional valve 6 and consists of a housing, a hydraulic motor, and multiple matching valves. The luffing balance control assembly 11 has two bidirectional oil ports, a' and b', which are used for both oil inlet and outlet to control the forward and reverse rotation of the hydraulic motor. The outlets of the directional valve 6 and the bidirectional oil ports of the luffing balance control assembly 11 are connected one-to-one, allowing the luffing balance control assembly 11 to be indirectly connected to the second hydraulic pump 5 through the directional valve 6. The luffing balance control assembly 11 outputs the hydraulic power provided by the second hydraulic pump 5 through the hydraulic motor, becoming the main power for driving the boom lifting and lowering. The luffing balance control assembly 11 also has a hydraulic output end S, which is alternately connected to ports a' and b' via a shuttle valve, and the hydraulic output end S outputs in parallel with the hydraulic motor.

[0032] The cylinder tracking control valve group 8 is connected to the third hydraulic pump 7. The cylinder tracking control valve group 8 includes a valve block 18, an electromagnetic unloading valve 14, a hydraulic control valve 15, and an internal overflow valve 16. The electromagnetic unloading valve 14, the hydraulic control valve 15, and the internal overflow valve 16 are integrated and installed in the valve block 18. The internal overflow valve 16 is also a liquid orifice. The hydraulic control valve 15 has two parallel ports. The valve switches between two operating states: in one state, the ports are bidirectional open hydraulic inlets and outlets; in the other state, they are unidirectional hydraulic outlets that only output. The input ends of the electromagnetic unloading valve 14 and the internal relief valve 16 are connected in parallel to one port of the hydraulic control valve 15. The other port of the hydraulic control valve 15 is connected to the output end of the cylinder tracking control valve group 8. The hydraulic control valve 15 is connected to the hydraulic output end of the luffing balance control device assembly 11. The electromagnetic unloading valve 14 is connected to the third hydraulic pump 7. The hydraulic control valve 15 operates simultaneously with the hydraulic motor in the luffing balance control device assembly 11. Unlike embodiment 1, in this embodiment, the valve block 18 is equipped with a hydraulic source interface P, a luffing balance control device assembly interface K, a boom cylinder interface A, a sensor interface J, a hydraulic control valve return port T1, and a common return port T2 for the electromagnetic unloading valve and the internal relief valve. No safety valve interface or safety valve 9 is provided. Hydraulic power interface P is the input terminal of cylinder tracking control valve group 8. Hydraulic power interface P is connected to the third hydraulic pump 7 through a pipeline. The input terminals of electromagnetic unloading valve 14 and internal relief valve 16 are also connected to hydraulic power interface P through pipelines. Boom cylinder interface A is the output terminal of cylinder tracking control valve group 8. Boom cylinder interface A, safety valve interface G, and sensor interface J are connected to another oil port of hydraulic control valve 15 through pipelines. A pressure sensor 13 is also connected to the pipeline between boom cylinder interface A and hydraulic control valve 15, and the pressure sensor 13 is installed on sensor interface J. The output terminals of electromagnetic unloading valve 14 and internal relief valve 16 are connected to the common return oil port T2 of electromagnetic unloading valve and internal relief valve through pipelines. Hydraulic control valve 15 has a drain port, and the drain port is connected to the return oil port T1 of hydraulic control valve. A safety valve 9 is connected to safety valve interface G.

[0033] The boom cylinder 12 is connected to the boom cylinder interface A via a pipeline, and the luffing balance control device assembly interface K is connected to the hydraulic output end S. The piston rod of the boom cylinder 12 is hinged to the boom 19 of the dynamic compaction machine, and the boom 19 is rotatably connected to the machine body via a rotating shaft. The cylinder body of the boom cylinder 12 is hinged to an anti-tilt bar, which is hinged to an A-frame, which is mounted on the machine body. The accumulator 10 is connected to the pipeline connecting the output end of the cylinder tracking control valve group 8 and the boom cylinder 12. The connection channel between the hydraulic output end of the luffing balance control device assembly 11 and the hydraulic control valve 15 is a damping orifice 17, which can realize the smooth switching of the working state of the hydraulic control valve 15 and reduce impact.

[0034] When the boom 19 needs to be raised, the boom buffer pressure control system of this dynamic compaction machine is activated. The first hydraulic pump 2, the second hydraulic pump 5, and the third hydraulic pump 7 start working, driving the pilot valve 4. The reversing valve 6 reverses under the pilot pressure of the pilot valve 4. The hydraulic motor in the luffing balance control device assembly 11 rotates. The hydraulic motor winds up the wire rope to lift the boom 19. At the same time, the hydraulic output end S synchronously controls the oil cylinder to track the luffing balance control device assembly interface K of the control valve group 8, thereby driving the boom cylinder 12 to start working synchronously with the hydraulic motor. Under the reverse thrust of the raised boom 18, the boom cylinder 12 discharges hydraulic oil in real time, so that the boom 18 maintains a stable pressure during the lifting process. When the boom 19 needs to be lowered, the boom buffer pressure control system of this dynamic compaction machine is activated. The first hydraulic pump 2, the second hydraulic pump 5, and the third hydraulic pump 7 start working, driving the pilot valve 4. The reversing valve 6 reverses under the pilot pressure of the pilot valve 4, and the hydraulic motor in the luffing balance control assembly 11 rotates. The hydraulic motor releases the steel wire rope to drive the boom 19 down. At the same time, the hydraulic output end S synchronously controls the cylinder tracking the luffing balance control assembly interface K of the control valve group 8, thereby driving the boom cylinder 12 to start working synchronously with the hydraulic motor. Under the action of the lowering boom 19, the boom cylinder 12 pushes the piston rod to extend in real time, so that the boom cylinder 12 maintains a stable cylinder pressure during the descent of the boom 18. Through the key control of the accumulator 10, on the one hand, the energy is automatically replenished when the boom 19 is raising the hammer on the ground, maintaining the real-time rigidity of the boom 19; on the other hand, when the hammer is released in the air, the fully released potential energy is absorbed by the accumulator 10, and the pressure of the accumulator 10 increases instantaneously, playing a buffering and shock-absorbing role.

[0035] Example 3:

[0036] A hydraulic buffer control system for a dynamic compaction machine boom includes a hydraulic tank 1, a hydraulic power source, a pilot valve 4, a directional valve 6, a luffing balance control device assembly 11, a cylinder tracking control valve group 8, an accumulator 10, and a boom cylinder 12. The hydraulic power source includes a first hydraulic pump 2, a second hydraulic pump 5, and a third hydraulic pump 7, each of which is connected to the hydraulic tank 1. The pilot valve 4 is connected to the first hydraulic pump 2, and an overflow valve 3 is also connected between the pilot valve 4 and the hydraulic tank 1. The pilot valve 4 has two power output terminals, which are connected to the directional valve 6 through pipelines and output hydraulic power to drive the directional valve 6 to switch directions. The second hydraulic pump 5 is connected to the inlet of the directional valve 6 via a pipeline. The directional valve 6 has two outlets, a and b. The luffing balance control assembly 11 is located downstream of the directional valve 6 and consists of a housing, a hydraulic motor, and multiple matching valves. The luffing balance control assembly 11 has two bidirectional oil ports, a' and b', which are used for both oil inlet and outlet to control the forward and reverse rotation of the hydraulic motor. The outlets of the directional valve 6 and the bidirectional oil ports of the luffing balance control assembly 11 are connected one-to-one, allowing the luffing balance control assembly 11 to be indirectly connected to the second hydraulic pump 5 through the directional valve 6. The luffing balance control assembly 11 outputs the hydraulic power provided by the second hydraulic pump 5 through the hydraulic motor, becoming the main power for driving the boom lifting and lowering. The luffing balance control assembly 11 also has a hydraulic output end S, which is alternately connected to ports a' and b' via a shuttle valve, and the hydraulic output end S outputs in parallel with the hydraulic motor.

[0037] The cylinder tracking control valve group 8 is connected to the third hydraulic pump 7. The cylinder tracking control valve group 8 includes a valve block 18, an electromagnetic unloading valve 14, a hydraulic control valve 15, and an internal overflow valve 16. The electromagnetic unloading valve 14, the hydraulic control valve 15, and the internal overflow valve 16 are integrated and installed in the valve block 18. Unlike embodiment 1, in this embodiment, the internal overflow valve 16, like the electromagnetic unloading valve 14, is electromagnetically controlled. The hydraulic control valve 15 has two parallel ports. The hydraulic control valve 15 switches between two working states. In one working state, the ports become bidirectional open hydraulic inlet and outlet, and in the other working state, the ports become unidirectional hydraulic outlet with only output and no input. The input end of the electromagnetic unloading valve 14 and the input end of the internal overflow valve 16 are connected in parallel to one port of the hydraulic control valve 15. The other port of the hydraulic control valve 15 is connected to the output end of the cylinder tracking control valve group 8. The hydraulic control valve 15 is connected to the hydraulic output end of the luffing balance control device assembly 11. The electromagnetic unloading valve 14 is connected to the third hydraulic pump 7. The hydraulic control valve 15 works simultaneously with the hydraulic motor in the luffing balance control device assembly 11. The valve block 18 is equipped with a hydraulic power source interface P, a luffing balance control device assembly interface K, a boom cylinder interface A, a sensor interface J, a safety valve interface G, a hydraulic control valve return port T1, and a common return port T2 for the electromagnetic unloading valve and the internal overflow valve. The hydraulic power source interface P is the input end of the cylinder tracking control valve group 8. The hydraulic power source interface P is connected to the third hydraulic pump 7 through a pipeline. The input ends of the electromagnetic unloading valve 14 and the internal overflow valve 16 are also connected to the hydraulic power source interface P through pipelines. The boom cylinder interface A is the output end of the cylinder tracking control valve group 8. The boom cylinder interface A, the safety valve interface G, and the sensor interface J are connected to another oil port of the hydraulic control valve 15 through pipelines. A pressure sensor 13 is also connected to the pipeline between the boom cylinder interface A and the hydraulic control valve 15. The pressure sensor 13 is installed on the sensor interface J. The operation of the internal overflow valve 16 is controlled by the pressure signal of the pressure sensor 13. The outputs of the electromagnetic unloading valve 14 and the internal overflow valve 16 are connected to the common return port T2 of the electromagnetic unloading valve and the internal overflow valve via pipelines. The hydraulic control valve 15 has an oil drain port, which is connected to the return port T1 of the hydraulic control valve. A safety valve 9 is connected to the safety valve interface G.

[0038] The boom cylinder 12 is connected to the boom cylinder interface A via a pipeline, and the luffing balance control device assembly interface K is connected to the hydraulic output end S. The piston rod of the boom cylinder 12 is hinged to the boom 19 of the dynamic compaction machine, and the boom 19 is rotatably connected to the machine body via a rotating shaft. The cylinder body of the boom cylinder 12 is hinged to an anti-tilt bar, which is hinged to an A-frame, which is mounted on the machine body. The accumulator 10 is connected to the pipeline connecting the output end of the cylinder tracking control valve group 8 and the boom cylinder 12. The connection channel between the hydraulic output end of the luffing balance control device assembly 11 and the hydraulic control valve 15 is a damping orifice 17, which can realize the smooth switching of the working state of the hydraulic control valve 15 and reduce impact.

[0039] When the boom 19 needs to be raised, the boom buffer pressure control system of this dynamic compaction machine is activated. The first hydraulic pump 2, the second hydraulic pump 5, and the third hydraulic pump 7 start working, driving the pilot valve 4. The reversing valve 6 reverses under the pilot pressure of the pilot valve 4. The hydraulic motor in the luffing balance control device assembly 11 rotates. The hydraulic motor winds up the wire rope to lift the boom 19. At the same time, the hydraulic output end S synchronously controls the oil cylinder to track the luffing balance control device assembly interface K of the control valve group 8, thereby driving the boom cylinder 12 to start working synchronously with the hydraulic motor. Under the reverse thrust of the raised boom 18, the boom cylinder 12 discharges hydraulic oil in real time, so that the boom 18 maintains a stable pressure during the lifting process. When the boom 19 needs to be lowered, the boom buffer pressure control system of this dynamic compaction machine is activated. The first hydraulic pump 2, the second hydraulic pump 5, and the third hydraulic pump 7 start working, driving the pilot valve 4. The reversing valve 6 reverses under the pilot pressure of the pilot valve 4, and the hydraulic motor in the luffing balance control assembly 11 rotates. The hydraulic motor releases the steel wire rope to drive the boom 19 down. At the same time, the hydraulic output end S synchronously controls the cylinder tracking the luffing balance control assembly interface K of the control valve group 8, thereby driving the boom cylinder 12 to start working synchronously with the hydraulic motor. Under the action of the lowering boom 19, the boom cylinder 12 pushes the piston rod to extend in real time, so that the boom cylinder 12 maintains a stable cylinder pressure during the descent of the boom 18. Through the key control of the accumulator 10, on the one hand, the energy is automatically replenished when the boom 19 is raising the hammer on the ground, maintaining the real-time rigidity of the boom 19; on the other hand, when the hammer is released in the air, the fully released potential energy is absorbed by the accumulator 10, and the pressure of the accumulator 10 increases instantaneously, playing a buffering and shock-absorbing role.

Claims

1. A hydraulic buffer control system for a dynamic compaction machine boom, comprising a hydraulic source and a variable amplitude balance control device assembly (11) connected to the hydraulic source and driven to raise and lower the boom by a hydraulic motor, characterized in that, It also includes a cylinder tracking control valve group (8) connected to the hydraulic power source and a boom cylinder (12) connected to the output end of the cylinder tracking control valve group (8). The boom cylinder (12) is connected between the boom of the dynamic compaction machine and an anti-tilt bar. The anti-tilt bar is hinged to the dynamic compaction machine. An accumulator (10) is also connected to the connecting pipeline between the output end of the cylinder tracking control valve group (8) and the boom cylinder (12). The cylinder tracking control valve group includes an electromagnetic unloading valve connected to the hydraulic power source and a hydraulic control valve connected to the hydraulic output end of the luffing balance control device assembly and the boom cylinder, as well as an internal overflow valve. The hydraulic control valve is also connected to the output end of the cylinder tracking control valve group and the hydraulic power source. The input end of the electromagnetic unloading valve and the input end of the internal overflow valve are connected in parallel to the connecting pipeline between the hydraulic control valve and the hydraulic power source.

2. The dynamic compaction machine boom buffer pressure control system according to claim 1, characterized in that, A pressure sensor (13) is connected to the connecting pipe between the hydraulic control valve (15) and the boom cylinder (12).

3. The dynamic compaction machine boom buffer pressure control system according to claim 1, characterized in that, The connection channel between the hydraulic output end of the variable amplitude balance control device assembly (11) and the hydraulic control valve (15) is a damping orifice (17).

4. The dynamic compaction machine boom buffer pressure control system according to claim 1, characterized in that, A safety valve (9) is also connected to the output end of the hydraulic control valve (15).

5. The buffer pressure control system for the boom of a dynamic compaction machine according to claim 1, characterized in that, A reversing valve (6) is also provided between the hydraulic power source and the variable amplitude balance control device assembly (11). The oil inlet of the reversing valve (6) is connected to the hydraulic power source. The reversing valve (6) has two oil outlets, which are connected one-to-one with the two bidirectional oil ports on the variable amplitude balance control device assembly (11).

6. The dynamic compaction machine boom buffer pressure control system according to claim 5, characterized in that, The hydraulic output end of the variable amplitude balance control device assembly (11) is alternately connected to the bidirectional oil port.

7. The dynamic compaction machine boom buffer pressure control system according to claim 5, characterized in that, It also includes a pilot valve (4), which is connected to the hydraulic source. The pilot valve (4) has two power output ends, which are connected to the directional valve (6) and output power to drive the directional valve (6) to switch.

8. The dynamic compaction machine boom buffer pressure control system according to any one of claims 1 to 7, characterized in that, The cylinder tracking control valve group (8) also includes a valve block (18), an electromagnetic unloading valve (14) and a hydraulic control valve (15) installed inside the valve block (18).

9. The buffer pressure control system for the boom of a dynamic compaction machine according to any one of claims 1 to 7, characterized in that, The hydraulic source includes multiple independent hydraulic pumps, and the cylinder tracking control valve group (8) and the variable amplitude balance control device assembly (11) are connected to two of the hydraulic pumps in a one-to-one correspondence.

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