Cantilever crane buffering hydraulic control system of dynamic compaction machine

Abstract

The invention discloses a dynamic compactor arm support buffering hydraulic control system which comprises a hydraulic source and a variable amplitude balance control device assembly which is connected with the hydraulic source and drives an arm support to ascend and descend through a hydraulic motor, and further comprises an oil cylinder tracking control valve set communicated with the hydraulic source and an arm support oil cylinder communicated with the output end of the oil cylinder tracking control valve set. The arm support oil cylinder is connected between an arm support of the dynamic compaction machine and an anti-roll rod, the anti-roll rod is hinged to the dynamic compaction machine, and an energy accumulator is further connected to a connecting pipeline of the output end of the oil cylinder tracking control valve set and the arm support oil cylinder. Through combination of the oil cylinder tracking control valve group and the energy accumulator, the action collaboration of the arm support and the oil cylinder can be improved, and the operation convenience is improved. The cantilever crane oil cylinder controlled by the oil cylinder tracking control valve group is adopted for buffering the cantilever crane, the response is fast, and continuous real-time follow-up work can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction equipment, and more specifically, to a dynamic compaction machine boom buffer pressure control system. Background Art

[0002] When the rammer arm is starting, the arm will shake due to the sudden change in load; when the rammer is unhooked at high altitude, the arm will rebound and shake due to the release of potential energy. In order to solve the stability problem of the rammer machine caused by the above working conditions, the following methods are currently used to buffer and prevent the arm of the rammer from shaking: 1. Use mechanical spring buffering; 2. Use double-acting cylinder system. When using mechanical springs, only one-way buffering can be achieved. When the rammer is started, the arm tilts downward due to the downward pull of the rammer, and there is a tendency to lose contact with the spring. At this time, the spring cannot provide reverse resistance to resist the arm. When using a double-acting cylinder system, the arm and the cylinder have poor coordination and need to be executed separately, which makes the operation more cumbersome and inconvenient. For example, the invention patent with publication number CN102720179A discloses a device for preventing the boom of a dynamic compaction machine from shaking and a dynamic compaction machine. The invention installs a buffer cylinder between the main arm and the A-frame to buffer the shaking of the main arm, etc., thereby increasing the service life of the equipment. However, it also does not solve the problem of poor coordination between the boom and the cylinder, making the operation more cumbersome and inconvenient. Summary of the invention

[0003] When a double-acting cylinder system is used to solve the problem of boom shaking, the boom and cylinder have poor coordination and need to be executed separately, which makes the operation more cumbersome and inconvenient. To overcome this defect, the present invention provides a boom buffer hydraulic control system, which can improve the coordination between the boom and cylinder and improve the convenience of operation.

[0004] The technical solution of the present invention is: a hydraulic pressure control system for a boom of a dynamic compaction machine, including a hydraulic source and a variable amplitude balance control device assembly connected to the hydraulic source and driving the boom to rise and fall through a hydraulic motor, and also including 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-roll bar, the anti-roll bar is hinged on the dynamic compaction machine, and 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 installation of control valves with multiple functions, and has the functions of driving the boom cylinder, stabilizing oil pressure, and saving energy. Through the key control of the accumulator, on the one hand, the boom is automatically completed when the hammer is lifted on the ground, and the energy is replenished to maintain the real-time rigidity of the boom; on the other hand, when the rammer is released during the operation of the dynamic compaction machine, the energy release is absorbed by the accumulator, so the accumulator pressure rises instantly, which plays a buffering and shock-absorbing role. Therefore, the present invention can solve the problem of boom rebounding due to instantaneous potential energy release by combining the oil 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 source and a hydraulic control valve connected to the hydraulic output end of the variable amplitude 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 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 puts the hydraulic source in an unloading state to achieve system energy saving. The hydraulic control valve is turned on when it receives the driving force output by the variable amplitude balance control device assembly to achieve power output to the boom cylinder; when the hydraulic control valve is not working, the load holding function of the hydraulic pressure control system of the boom buffer of the tamping machine is realized. The pressure sensor can give an alarm prompt for the minimum safety pressure of the pressure maintaining system to ensure system safety.

[0006] Preferably, the oil cylinder tracking control valve group further includes a relief valve, and the input end of the electromagnetic unloading valve and the input end of the relief valve are connected in parallel to the connecting pipeline between the hydraulic control valve and the hydraulic source. The relief valve is used to maintain the pressure stability of the oil cylinder tracking control valve group to ensure that the boom can be lifted and lowered under the action of stable pressure.

[0007] Preferably, the connecting channel between the hydraulic output end of the variable amplitude balancing control device assembly and the hydraulic control valve is a damping hole. The damping hole allows the hydraulic pressure output by the variable amplitude balancing control device assembly to be gently transmitted to the cylinder tracking control valve group, thereby achieving smooth switching of the working state of the hydraulic control valve and reducing impact.

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

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

[0010] Preferably, the hydraulic output end of the boom balance control device assembly is alternately connected to the two-way oil port. While driving the boom to rise and fall, the boom balance control device assembly also obtains hydraulic driving force from the two-way oil port through the hydraulic output end, so that the hydraulic output end becomes an output end parallel to the boom lifting main power output end, and controls the downstream oil cylinder tracking control valve group.

[0011] Preferably, the hydraulic pressure control system for the boom of the dynamic tamping machine further includes a pilot valve, which is connected to the hydraulic source and has two power output ends, which are connected to the reversing valve through a pipeline and output power for driving the reversing valve to change direction. The pilot valve converts the power of the hydraulic source into pilot pressures corresponding to the lifting and lowering actions of the boom, respectively, and the reversing valve completes the reversing under the action of the pilot pressure, and then performs the corresponding control of the lifting and lowering actions of the boom.

[0012] As a preferred embodiment, the oil cylinder tracking control valve group further comprises a valve block, and the electromagnetic unloading valve and the hydraulic control valve are installed in the valve block. The oil cylinder tracking control valve group is formed by integrating multiple functional control valves in the valve block, and has a compact structure, fast response, small leakage and high control accuracy.

[0013] Preferably, the hydraulic source includes a plurality of independent hydraulic pumps, and the oil cylinder tracking control valve group and the variable amplitude balance control device assembly are connected to two of the hydraulic pumps in a one-to-one correspondence. The plurality of independent hydraulic pumps work separately, which can simplify the control circuit and reduce mutual interference.

[0014] The beneficial effects of the present invention are: The invention is convenient to operate. The invention can improve the coordination of the boom and the cylinder movement and improve the convenience of operation by combining the cylinder tracking control valve group and the accumulator.

[0015] Good control tracking performance. The present invention adopts the boom oil cylinder controlled by the oil cylinder tracking control valve group to perform boom buffering, which has a fast response and can continuously perform real-time follow-up work.

[0016] High safety and reliability. The present invention is equipped with protection devices such as safety valves and pressure sensors. The pressure sensor monitors the pressure situation in real time. When the accumulator reserves energy, the pressure sensor can give an alarm prompt for the minimum safety pressure of the pressure-maintaining system to ensure system safety.

[0017] Low operation and maintenance cost: The present invention can increase the stability of the boom, greatly improve work efficiency, and help reduce operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the positional relationship between the boom cylinder and the boom in the present invention.

[0019] Figure 2 The figure is a control circuit schematic diagram of the present invention.

[0020] Figure 3 It is a structural schematic diagram of the oil cylinder tracking control valve group in the present invention.

[0021] Figure 4 The control circuit schematic diagram of the oil cylinder tracking control valve group in the present invention.

[0022] In the figure, 1-hydraulic oil tank, 2-first hydraulic pump, 3-overflow valve, 4-pilot valve, 5-second hydraulic pump, 6-reversing valve, 7-third hydraulic pump, 8-cylinder tracking control valve group, 9-safety valve, 10-accumulator, 11-luffing balance control device assembly, 12-arm cylinder, 13-pressure sensor, 14-electromagnetic unloading valve, 15-hydraulic control valve, 16-internal overflow valve, 17-damping hole, 18-valve block, 19-arm. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to specific embodiments of the accompanying drawings.

[0024] Embodiment 1: like Figures 1 to 4 As shown, a hydraulic control system for a boom buffer of a dynamic tamping machine includes a hydraulic oil tank 1, a hydraulic source, a pilot valve 4, a reversing valve 6, an amplitude balance control device assembly 11, a cylinder tracking control valve group 8, an accumulator 10, and a boom cylinder 12. The hydraulic 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 oil tank 1, the pilot valve 4 is connected to the first hydraulic pump 2, and an overflow valve 3 is connected between the pilot valve 4 and the hydraulic oil tank 1. The pilot valve 4 is provided with two power output ends, which are connected to the reversing valve 6 through a pipeline and output oil pressure power to drive the reversing valve 6 to change direction. The second hydraulic pump 5 is connected to the oil inlet of the reversing valve 6 through a pipeline. The reversing valve 6 has two oil outlets a and b. The variable amplitude balance control device assembly 11 is located downstream of the reversing valve 6 and is composed of a housing, a hydraulic motor and a plurality of matching valves. The variable amplitude balance control device assembly 11 has two bidirectional oil ports a' and b'. The ports a' and b' are both for oil inlet and oil return, so as to realize the forward and reverse control of the hydraulic motor. The oil outlet of the reversing valve 6 is connected to the bidirectional oil port of the variable amplitude balance control device assembly 11 in a one-to-one correspondence, so that the variable amplitude balance control device assembly 11 is indirectly connected to the second hydraulic pump 5 through the reversing valve 6. The variable amplitude balance control device assembly 11 outputs the hydraulic power provided by the second hydraulic pump 5 through the hydraulic motor, which becomes the main power for driving the boom to rise and fall. The variable amplitude balance control device assembly 11 also has a hydraulic output terminal S, which is alternately connected to the ports a' and b' through a shuttle valve, and the hydraulic output terminal S is output in parallel with the hydraulic motor.

[0025] 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 in the valve block 18, and the internal overflow valve 16 is also a liquid hole. The hydraulic control valve 15 has two parallel oil ports. The hydraulic control valve 15 switches between two working states. In one working state, the oil port becomes a bidirectionally open hydraulic inlet and outlet. In the other working state, the oil port becomes a one-way hydraulic outlet with only output but 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 oil port of the hydraulic control valve 15. The other oil 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 variable amplitude balancing control device assembly 11. The electromagnetic unloading valve 14 is connected to the third hydraulic pump 7. The hydraulic control valve 15 follows the hydraulic motor in the variable amplitude balancing control device assembly 11 to work simultaneously. The valve block 18 is provided with a hydraulic source interface P, an interface K of the variable amplitude balance control device assembly, an interface A of the boom oil cylinder, a sensor interface J, a safety valve interface G, a hydraulic control valve oil return port T1, and a common oil return port T2 of the electromagnetic unloading valve and the internal overflow valve. The hydraulic source interface P is the input end of the oil cylinder tracking control valve group 8. The hydraulic source interface P is connected to the third hydraulic pump 7 through a pipeline. The input end of the electromagnetic unloading valve 14 and the input end of the internal overflow valve 16 are also connected to the hydraulic source interface P through a pipeline. The boom oil cylinder interface A is the output end of the oil cylinder tracking control valve group 8. The boom oil 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 a pipeline. A pressure sensor 13 is also connected to the pipeline between the boom oil 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 overflow valve 16 are connected to the common oil return port T2 of the electromagnetic unloading valve and the internal overflow valve through a pipeline. The hydraulic control valve 15 has an oil discharge port which is connected to the hydraulic control valve oil return port T1. A safety valve 9 is connected to the safety valve interface G.

[0026] The arm cylinder 12 is connected to the arm cylinder interface A through a pipeline, and the interface K of the variable amplitude balance control device assembly is connected to the hydraulic output end S. The piston rod of the arm cylinder 12 is hinged on the arm 19 of the tamping machine, and the arm 19 is rotatably connected to the body of the tamping machine through a rotating shaft. The cylinder body of the arm cylinder 12 is hinged on an anti-roll bar, and the anti-roll bar is hinged on a herringbone frame, which is installed on the body of the tamping machine. The accumulator 10 is connected to the connecting pipeline between the output end of the cylinder tracking control valve group 8 and the arm cylinder 12. The connecting channel between the hydraulic output end of the variable amplitude balance control device assembly 11 and the hydraulic control valve 15 is a damping hole 17, which can realize the smooth switching of the working state of the hydraulic control valve 15 and reduce the impact.

[0027] When it is necessary to lift the boom 19, the boom buffer pressure control system of the tamping machine is started, and the first hydraulic pump 2, the second hydraulic pump 5 and the third hydraulic pump 7 start to work, driving the pilot valve 4. The reversing valve 6 changes direction under the pilot pressure of the pilot valve 4, and the hydraulic motor in the boom balancing control device assembly 11 rotates. The hydraulic motor reels in the wire rope to drive the boom 19 to lift. At the same time, the hydraulic output end S synchronously controls the cylinder tracking control valve group 8 of the boom balancing control device assembly interface K, 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 hydraulic control system of the tamping machine is started, the first hydraulic pump 2, the second hydraulic pump 5 and the third hydraulic pump 7 start working, drive the pilot valve 4, the reversing valve 6 changes direction under the pilot pressure of the pilot valve 4, the hydraulic motor in the variable amplitude balance control device assembly 11 rotates, the hydraulic motor releases the steel wire rope to drive the boom 19 to descend, and at the same time, the hydraulic output end S synchronously controls the oil cylinder to track the variable amplitude 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 action of the descending 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 boom 19 is automatically completed when the hammer is lifted on the ground, and the energy is replenished to maintain the real-time rigidity of the boom 19; on the other hand, when the tamping 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 instantly, which plays a buffering and shock absorbing role.

[0028] Embodiment 2: A hydraulic control system for a boom buffer of a dynamic tamping machine includes a hydraulic oil tank 1, a hydraulic source, a pilot valve 4, a reversing valve 6, an amplitude balance control device assembly 11, a cylinder tracking control valve group 8, an accumulator 10, and a boom cylinder 12. The hydraulic 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 oil tank 1, the pilot valve 4 is connected to the first hydraulic pump 2, and an overflow valve 3 is connected between the pilot valve 4 and the hydraulic oil tank 1. The pilot valve 4 is provided with two power output ends, which are connected to the reversing valve 6 through a pipeline and output oil pressure power to drive the reversing valve 6 to change direction. The second hydraulic pump 5 is connected to the oil inlet of the reversing valve 6 through a pipeline. The reversing valve 6 has two oil outlets a and b. The variable amplitude balance control device assembly 11 is located downstream of the reversing valve 6 and is composed of a housing, a hydraulic motor and a plurality of matching valves. The variable amplitude balance control device assembly 11 has two bidirectional oil ports a' and b'. The ports a' and b' are both for oil inlet and oil return, so as to realize the forward and reverse control of the hydraulic motor. The oil outlet of the reversing valve 6 is connected to the bidirectional oil port of the variable amplitude balance control device assembly 11 in a one-to-one correspondence, so that the variable amplitude balance control device assembly 11 is indirectly connected to the second hydraulic pump 5 through the reversing valve 6. The variable amplitude balance control device assembly 11 outputs the hydraulic power provided by the second hydraulic pump 5 through the hydraulic motor, which becomes the main power for driving the boom to rise and fall. The variable amplitude balance control device assembly 11 also has a hydraulic output terminal S, which is alternately connected to the ports a' and b' through a shuttle valve, and the hydraulic output terminal S is output in parallel with the hydraulic motor.

[0029] 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 in the valve block 18, and the internal overflow valve 16 is also a liquid hole. The hydraulic control valve 15 has two parallel oil ports. The hydraulic control valve 15 is switched between two working states. In one working state, the oil port becomes a bidirectionally open hydraulic inlet and outlet. In the other working state, the oil port becomes a one-way hydraulic outlet with only output but 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 oil port of the hydraulic control valve 15. The other oil 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 variable amplitude 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 variable amplitude balance control device assembly 11. Different from the embodiment 1, the valve block 18 in this embodiment is provided with a hydraulic source interface P, a variable amplitude balance control device assembly interface K, a boom cylinder interface A, a sensor interface J, a hydraulic control valve return oil port T1, and a common return oil port T2 of the electromagnetic unloading valve and the internal overflow valve, but no safety valve interface and safety valve 9 are provided. The hydraulic source interface P is the input end of the cylinder tracking control valve group 8. The hydraulic source interface P is connected to the third hydraulic pump 7 through a pipeline. The input end of the electromagnetic unloading valve 14 and the input end of the internal overflow valve 16 are also connected to the hydraulic source interface P through a pipeline. The arm cylinder interface A is the output end of the cylinder tracking control valve group 8. The arm 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 a pipeline. There is also a pressure sensor 13 connected to the pipeline between the arm 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 overflow valve 16 are connected to the common oil return port T2 of the electromagnetic unloading valve and the internal overflow valve through a pipeline. The hydraulic control valve 15 has an oil discharge port and the oil discharge port is connected to the oil return port T1 of the hydraulic control valve. A safety valve 9 is connected to the safety valve interface G.

[0030] The arm cylinder 12 is connected to the arm cylinder interface A through a pipeline, and the interface K of the variable amplitude balance control device assembly is connected to the hydraulic output end S. The piston rod of the arm cylinder 12 is hinged on the arm 19 of the tamping machine, and the arm 19 is rotatably connected to the body of the tamping machine through a rotating shaft. The cylinder body of the arm cylinder 12 is hinged on an anti-roll bar, and the anti-roll bar is hinged on a herringbone frame, which is installed on the body of the tamping machine. The accumulator 10 is connected to the connecting pipeline between the output end of the cylinder tracking control valve group 8 and the arm cylinder 12. The connecting channel between the hydraulic output end of the variable amplitude balance control device assembly 11 and the hydraulic control valve 15 is a damping hole 17, which can realize the smooth switching of the working state of the hydraulic control valve 15 and reduce the impact.

[0031] When it is necessary to lift the boom 19, the boom buffer pressure control system of the tamping machine is started, and the first hydraulic pump 2, the second hydraulic pump 5 and the third hydraulic pump 7 start to work, driving the pilot valve 4. The reversing valve 6 changes direction under the pilot pressure of the pilot valve 4, and the hydraulic motor in the boom balancing control device assembly 11 rotates. The hydraulic motor reels in the wire rope to drive the boom 19 to lift. At the same time, the hydraulic output end S synchronously controls the cylinder tracking control valve group 8 of the boom balancing control device assembly interface K, 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 hydraulic control system of the tamping machine is started, the first hydraulic pump 2, the second hydraulic pump 5 and the third hydraulic pump 7 start working, drive the pilot valve 4, the reversing valve 6 changes direction under the pilot pressure of the pilot valve 4, the hydraulic motor in the variable amplitude balance control device assembly 11 rotates, the hydraulic motor releases the steel wire rope to drive the boom 19 to descend, and at the same time, the hydraulic output end S synchronously controls the oil cylinder to track the variable amplitude 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 action of the descending 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 boom 19 is automatically completed when the hammer is lifted on the ground, and the energy is replenished to maintain the real-time rigidity of the boom 19; on the other hand, when the tamping 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 instantly, which plays a buffering and shock absorbing role.

[0032] Embodiment 3: A hydraulic control system for a boom buffer of a dynamic tamping machine includes a hydraulic oil tank 1, a hydraulic source, a pilot valve 4, a reversing valve 6, an amplitude balance control device assembly 11, a cylinder tracking control valve group 8, an accumulator 10, and a boom cylinder 12. The hydraulic 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 oil tank 1, the pilot valve 4 is connected to the first hydraulic pump 2, and an overflow valve 3 is connected between the pilot valve 4 and the hydraulic oil tank 1. The pilot valve 4 is provided with two power output ends, which are connected to the reversing valve 6 through a pipeline and output oil pressure power to drive the reversing valve 6 to change direction. The second hydraulic pump 5 is connected to the oil inlet of the reversing valve 6 through a pipeline. The reversing valve 6 has two oil outlets a and b. The variable amplitude balance control device assembly 11 is located downstream of the reversing valve 6 and is composed of a housing, a hydraulic motor and a plurality of matching valves. The variable amplitude balance control device assembly 11 has two bidirectional oil ports a' and b'. The ports a' and b' are both for oil inlet and oil return, so as to realize the forward and reverse control of the hydraulic motor. The oil outlet of the reversing valve 6 is connected to the bidirectional oil port of the variable amplitude balance control device assembly 11 in a one-to-one correspondence, so that the variable amplitude balance control device assembly 11 is indirectly connected to the second hydraulic pump 5 through the reversing valve 6. The variable amplitude balance control device assembly 11 outputs the hydraulic power provided by the second hydraulic pump 5 through the hydraulic motor, which becomes the main power for driving the boom to rise and fall. The variable amplitude balance control device assembly 11 also has a hydraulic output terminal S, which is alternately connected to the ports a' and b' through a shuttle valve, and the hydraulic output terminal S is output in parallel with the hydraulic motor.

[0033] 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 in the valve block 18. Different from Example 1, the internal overflow valve 16 in this embodiment is electromagnetically controlled like the electromagnetic unloading valve 14. The hydraulic control valve 15 has two parallel oil ports. The hydraulic control valve 15 switches between two working states. In one working state, the oil port becomes a bidirectionally open hydraulic inlet and outlet. In the other working state, the oil port becomes a one-way hydraulic outlet with only output but 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 oil port of the hydraulic control valve 15. The other oil 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 variable amplitude balancing control device assembly 11. The electromagnetic unloading valve 14 is connected to the third hydraulic pump 7. The hydraulic control valve 15 follows the hydraulic motor in the variable amplitude balancing control device assembly 11 to work simultaneously. The valve block 18 is provided with a hydraulic source interface P, an interface K of the variable amplitude balance control device assembly, an arm cylinder interface A, a sensor interface J, a safety valve interface G, a hydraulic control valve oil return port T1, and a common oil return port T2 of the electromagnetic unloading valve and the internal overflow valve. The hydraulic source interface P is the input end of the cylinder tracking control valve group 8. The hydraulic source interface P is connected to the third hydraulic pump 7 through a pipeline. The input end of the electromagnetic unloading valve 14 and the input end of the internal overflow valve 16 are also connected to the hydraulic source interface P through a pipeline. The arm cylinder interface A is the output end of the cylinder tracking control valve group 8. The arm 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 a pipeline. A pressure sensor 13 is also connected to the pipeline between the arm 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 output ends of the electromagnetic unloading valve 14 and the internal overflow valve 16 are connected to the common oil return port T2 of the electromagnetic unloading valve and the internal overflow valve through pipelines. The hydraulic control valve 15 has an oil discharge port and the oil discharge port is connected to the hydraulic control valve oil return port T1. A safety valve 9 is connected to the safety valve interface G.

[0034] The arm cylinder 12 is connected to the arm cylinder interface A through a pipeline, and the interface K of the variable amplitude balance control device assembly is connected to the hydraulic output end S. The piston rod of the arm cylinder 12 is hinged on the arm 19 of the tamping machine, and the arm 19 is rotatably connected to the body of the tamping machine through a rotating shaft. The cylinder body of the arm cylinder 12 is hinged on an anti-roll bar, and the anti-roll bar is hinged on a herringbone frame, which is installed on the body of the tamping machine. The accumulator 10 is connected to the connecting pipeline between the output end of the cylinder tracking control valve group 8 and the arm cylinder 12. The connecting channel between the hydraulic output end of the variable amplitude balance control device assembly 11 and the hydraulic control valve 15 is a damping hole 17, which can realize the smooth switching of the working state of the hydraulic control valve 15 and reduce the impact.

[0035] When it is necessary to lift the boom 19, the boom buffer pressure control system of the tamping machine is started, and the first hydraulic pump 2, the second hydraulic pump 5 and the third hydraulic pump 7 start to work, driving the pilot valve 4. The reversing valve 6 changes direction under the pilot pressure of the pilot valve 4, and the hydraulic motor in the boom balancing control device assembly 11 rotates. The hydraulic motor reels in the wire rope to drive the boom 19 to lift. At the same time, the hydraulic output end S synchronously controls the cylinder tracking control valve group 8 of the boom balancing control device assembly interface K, 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 hydraulic control system of the tamping machine is started, the first hydraulic pump 2, the second hydraulic pump 5 and the third hydraulic pump 7 start working, drive the pilot valve 4, the reversing valve 6 changes direction under the pilot pressure of the pilot valve 4, the hydraulic motor in the variable amplitude balance control device assembly 11 rotates, the hydraulic motor releases the steel wire rope to drive the boom 19 to descend, and at the same time, the hydraulic output end S synchronously controls the oil cylinder to track the variable amplitude 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 action of the descending 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 boom 19 is automatically completed when the hammer is lifted on the ground, and the energy is replenished to maintain the real-time rigidity of the boom 19; on the other hand, when the tamping 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 instantly, which plays a buffering and shock absorbing role.

Claims

1. A hydraulic pressure control system for a boom of a dynamic compaction machine, comprising a hydraulic source and a variable amplitude balance control device assembly (11) connected to the hydraulic source and driving the boom to rise and fall through a hydraulic motor, wherein: It also includes an oil cylinder tracking control valve group (8) connected to a hydraulic source and an arm oil cylinder (12) connected to an output end of the oil cylinder tracking control valve group (8), the arm oil cylinder (12) being connected between an arm of the dynamic compaction machine and an anti-roll bar, the anti-roll bar being hinged to the dynamic compaction machine, and an accumulator (10) being connected to a connecting pipeline between the output end of the oil cylinder tracking control valve group (8) and the arm oil cylinder (12).

2. The dynamic compaction machine boom buffer pressure control system according to claim 1 is characterized in that: The cylinder tracking control valve group (8) comprises an electromagnetic unloading valve (14) connected to a hydraulic source and a hydraulic control valve (15) connected to a hydraulic output end of the boom balance control device assembly (11) and the boom cylinder (12). The hydraulic control valve (15) is also connected to an output end of the cylinder tracking control valve group (8) and the hydraulic source. A pressure sensor (13) is connected to a connecting pipeline between the hydraulic control valve (15) and the boom cylinder (12).

3. The dynamic compaction machine boom buffer pressure control system according to claim 2 is characterized in that: The oil cylinder tracking control valve group (8) further comprises a relief valve (16). The input end of the electromagnetic unloading valve (14) and the input end of the relief valve (16) are connected in parallel to the connecting pipeline between the hydraulic control valve (15) and the hydraulic source.

4. The dynamic compaction machine boom buffer pressure control system according to claim 2 is characterized in that: The connecting passage between the hydraulic output end of the variable amplitude balance control device assembly (11) and the hydraulic control valve (15) is a damping hole (17).

5. The dynamic compaction machine boom buffer pressure control system according to claim 2 is characterized in that: The output end of the hydraulic control valve (15) is also connected to a safety valve (9).

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

7. The dynamic compaction machine boom buffer pressure control system according to claim 6 is characterized in that: The hydraulic output end of the variable amplitude balancing control device assembly (11) is alternately connected to the two-way oil port.

8. The dynamic compaction machine boom buffer pressure control system according to claim 6, characterized in that: It also includes a pilot valve (4), which is connected to the hydraulic source. The pilot valve (4) is provided with two power output ends, which are connected to the reversing valve (6) and output power for driving the reversing valve (6) to change direction.

9. The dynamic compaction machine boom buffer pressure control system according to any one of claims 2 to 8, characterized in that: The oil cylinder tracking control valve group (8) further comprises a valve block (18), and the electromagnetic unloading valve (14) and the hydraulic control valve (15) are installed in the valve block (18).

10. The dynamic compaction machine boom buffer pressure control system according to any one of claims 1 to 8, characterized in that: The hydraulic source comprises a plurality of independent hydraulic pumps, and the oil cylinder tracking control valve group (8) and the amplitude balancing control device assembly (11) are connected to two of the hydraulic pumps in a one-to-one correspondence.

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