A hydraulic station with a load-sensitive pressure compensator

Abstract

The present invention provides a hydraulic station with a load-sensitive pressure compensator, which relates to the technical field of hydraulic stations. The hydraulic station with a load-sensitive pressure compensator includes a base and a bracket. A bracket is fixedly connected above the base, and a workbench is fixedly connected to the top of the bracket. A hydraulic oil tank is fixedly connected to the middle part below the workbench. A plunger pump is fixedly connected to one end above the workbench, and a gear transmission box is arranged at the output end of the plunger pump. Through the load-sensitive compensation valve arranged inside the pressure compensator body, the present invention can, under the cooperation of a fixed piston, a sliding oil cylinder and a return spring, adjust the swash plate angle of the plunger pump body by the action of a directional control valve by using the liquid outlet pressure of the plunger pump body, so as to ensure that the liquid outlet pressure of the plunger pump body is only higher than the load pressure by the spring pressure of a low-pressure spring spool, improving the working efficiency of the hydraulic station and reducing the power loss and heat generation.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic stations, and particularly to a hydraulic station with a load-sensitive pressure compensator. Background Art

[0002] A hydraulic station, also known as a hydraulic pump station, is a hydraulic source device composed of a hydraulic pump, a driving electric motor, an oil tank, a directional valve, a throttle valve, an overflow valve, etc., or a hydraulic device including a control valve. It drives the oil pump to work through an electric motor. The oil pump sucks oil from the oil tank and then pumps the oil, thereby converting mechanical energy into the pressure energy of the hydraulic oil. After the hydraulic oil realizes the adjustment of direction, pressure, and flow through an integrated block (or valve combination), it is transmitted to the cylinder or oil motor of the hydraulic machinery through an external pipeline, and can supply oil according to the required flow direction, pressure, and flow rate of the driving device, thereby controlling the change of the direction of the hydraulic motor, the magnitude of the force, and the speed, and driving various hydraulic machinery to do work. It is applicable to various machines where the driving device is separated from the hydraulic station. Connecting the hydraulic station and the driving device (cylinder or motor) with a pipeline, the hydraulic system can achieve various specified actions.

[0003] The traditional center relief, fixed displacement hydraulic station cannot adjust the pump flow according to the hydraulic pressure. And when the load pressure exceeds the hydraulic pressure, to avoid overloading of the hydraulic pump, the hydraulic oil will be drained through the overflow valve. At this time, the hydraulic pump still operates at high pressure. When the cylinder is lightly loaded, in order to ensure the stable operation of the cylinder, the remaining displacement will also be drained back to the hydraulic oil tank, increasing the power loss and heat generation, and reducing the working efficiency of the hydraulic station. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a hydraulic station with a load-sensitive pressure compensator, which solves the problems described in the background art.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the present invention is realized by the following technical solutions: A hydraulic station with a load-sensitive pressure compensator, comprising a base and a bracket. The bracket is fixedly connected above the base. The top of the bracket is fixedly connected with a workbench. The middle part below the workbench is fixedly connected with a hydraulic oil tank. One end above the workbench is fixedly connected with a plunger pump. The output end of the plunger pump is provided with a gear transmission box. One side above the workbench near the gear transmission box is fixedly connected with a hydraulic motor. Below one end of the plunger pump away from the gear transmission box is provided an inlet pipe. One end of the inlet pipe away from the plunger pump is fixedly communicated with an inlet valve. Above the plunger pump is fixedly connected with a pressure compensator body. One end of the plunger pump above and away from the gear transmission box is fixedly communicated with an outlet valve. The outlet of the outlet valve away from the gear transmission box is fixedly communicated with an outlet pipe. One end of the outlet pipe away from the outlet valve is fixedly communicated with a reversing valve. A check valve is arranged at the connection between the outlet pipe and the reversing valve. Both ends above the reversing valve are fixedly communicated with an oil supply pipe;

[0008] The outlet of the outlet valve away from the outlet pipe is fixedly communicated with a load-sensitive compensation valve through a pipeline. The load-sensitive compensation valve comprises a valve body, a valve core seat, a low-pressure spring valve core, a high-pressure spring valve core, a piston oil circuit and an inlet oil circuit. The middle part above the valve body is fixedly inlaid with a valve core seat. Spring cavities are respectively arranged on both sides of the valve core seat. The low-pressure spring valve core and the high-pressure spring valve core are respectively arranged in the two spring cavities. An adjustment circuit is arranged below the interior of the valve body. A piston oil circuit is arranged on one side below the valve body near the low-pressure spring valve core. An inlet oil circuit is arranged on one side below the valve body near the high-pressure spring valve core. The bottom of the low-pressure spring valve core is fixedly connected with a four-valve plate valve rod. The bottom of the high-pressure spring valve core is fixedly connected with a double-valve plate valve rod. The middle part above the reversing valve is fixedly communicated with a return pipe. Below one side of the pressure compensator body near the reversing valve is fixedly connected with a drain pipe;

[0009] At a position corresponding to the piston oil circuit on the side of the valve body away from the liquid outlet valve, a fixed pipe is fixedly connected. At the outer side of one end of the fixed pipe away from the load-sensitive compensation valve, a fixed piston is fixedly connected. The outer side of the fixed piston is slidably and sealingly connected with a sliding oil cylinder. The outer side of the sliding oil cylinder is slidably connected with a limit sliding seat. One end of the sliding oil cylinder away from the load-sensitive compensation valve is fixedly connected with an adjusting seat. Inside the adjusting seat, a lifting seat is slidably connected up and down. The bottom of the lifting seat is rotatably connected with an inclined plate connecting rod. One end of the adjusting seat away from the sliding oil cylinder is fixedly connected with a return spring. One end of the return spring away from the adjusting seat is fixedly connected with a spring seat. Above the limit sliding seat, a bevel gear transmission is fixedly connected. In the middle above the bevel gear transmission, an input shaft is provided, and the bevel gear transmission is rotatably connected with an adjusting handwheel through the input shaft. In the middle on one side of the bevel gear transmission away from the sliding oil cylinder, an output shaft is provided, and the bevel gear transmission is rotatably connected with an adjusting lead screw through the output shaft. A lead screw nut is arranged on the outer side of the adjusting lead screw.

[0010] Preferably, the adjustment circuit includes a low-pressure valve core hole corresponding to the four-valve plate valve rod, a high-pressure valve core hole corresponding to the double-valve plate valve rod, a bottom communication hole corresponding to the oil inlet oil circuit, a middle communication hole corresponding to the piston oil circuit, and an upper communication hole located above the middle communication hole. Both ends of the bottom communication hole, the middle communication hole, and the upper communication hole are respectively fixedly connected with the low-pressure valve core hole and the high-pressure valve core hole. An oil discharge communication hole is opened at the bottom of the valve core seat.

[0011] Preferably, at a position corresponding to the return oil pipe inside the reversing valve, a jacking check valve is arranged. One end of the return oil pipe is fixedly connected with the jacking check valve. A throttle hole communicated with the return oil pipe is opened inside the reversing valve, and the throttle hole is communicated with the hydraulic oil tank, and the jacking check valve can act as an overflow valve when the load-sensitive system fails, improving the fault tolerance of the system.

[0012] Preferably, the side of the return oil pipe away from the reversing valve passes through the pressure compensator main body and is communicated with the spring cavity corresponding to the low-pressure spring valve core.

[0013] Preferably, one end of the oil discharge pipe close to the pressure compensator main body is connected with the oil discharge communication hole through the low-pressure valve core hole corresponding to the four-valve plate valve rod, and the connection hole position of the oil discharge pipe corresponds to the position of the uppermost valve plate of the four-valve plate valve rod. One end of the oil discharge pipe away from the pressure compensator main body is fixedly connected with the hydraulic oil tank.

[0014] Preferably, the outer sides of the adjusting seat and the spring seat are both slidably connected with the inner side of the limit sliding seat.

[0015] Preferably, the adjusting handwheel is drivingly connected to the adjusting lead screw through a bevel gear drive. One end of the adjusting lead screw away from the bevel gear drive is rotatably connected to the pressure compensator body. The lower part of the lead screw nut is fixedly connected to the spring seat, and the compression stroke of the return spring can be adjusted by the adjusting handwheel.

[0016] Working principle: When the present invention is working, the load-sensitive compensation valve provided inside the pressure compensator body, in cooperation with the fixed piston, the sliding oil cylinder and the return spring, through the action of the reversing valve, uses the liquid outlet pressure of the plunger pump body to adjust the swash plate angle of the plunger pump body. When the reversing valve is not connected, the oil pressure of the liquid inlet oil hole directly lifts the four-valve plate valve stem of the low-pressure spring valve core into the piston oil circuit to lift the sliding oil cylinder and move the adjusting seat, thereby causing the swash plate angle to be approximately zero, and the pump flow rate to be the same as the oil leakage rate. When the reversing valve is connected, the hydraulic oil enters the oil supply oil circuit through the liquid inlet end oil circuit of the lifting check valve, and at the same time enters the corresponding spring cavity through the lifting check valve and the return oil pipe. The pressures on both sides of the low-pressure spring valve core are balanced, and the spring pressure causes the four-valve plate valve stem to return to its position. The hydraulic oil of the sliding oil cylinder is released through the oil discharge pipe, and the pump flow rate increases. When the oil pressure is greater than the spring force of the high-pressure spring valve core, the hydraulic oil pushes the double-valve plate valve stem to move, thereby entering the piston oil circuit, making the swash plate angle approximately zero, and the pump flow rate the same as the oil leakage rate. Compared with the traditional middle-position oil return and fixed-displacement hydraulic station, the power loss and heat generation are reduced, and the working efficiency of the hydraulic station is improved.

[0017] (III) Beneficial effects

[0018] The present invention provides a hydraulic station with a load-sensitive pressure compensator. It has the following beneficial effects:

[0019] 1. Through the load-sensitive compensation valve provided inside the pressure compensator body of the present invention, in cooperation with the fixed piston, the sliding oil cylinder and the return spring, through the action of the reversing valve, the liquid outlet pressure of the plunger pump body is used to adjust the swash plate angle of the plunger pump body, thereby ensuring that the liquid outlet pressure of the plunger pump body is only higher than the load pressure by the spring pressure of a low-pressure spring valve core, improving the working efficiency of the hydraulic station, and reducing the power loss and heat generation.

[0020] 2. The load-sensitive compensation valve of the present invention is formed by setting the combination of the valve body and the valve core seat. By using the method of separate machining and then combination, the difficulty of internal oil circuit punching and filling can be effectively reduced, and the processing efficiency is improved. Cooperating with the corresponding spring valve core and valve plate valve stem to form a load-sensitive circuit, the flow demand can be adjusted according to the load system pressure, strengthening the practicability of the present invention. Brief description of the drawings

[0021] Figure 1 It is a left-side three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 Schematic diagram of the right three-dimensional structure of the present invention;

[0023] Figure 3 Schematic diagram of the rear three-dimensional structure of the present invention;

[0024] Figure 4 Schematic diagram of the internal structure of the pressure compensator body of the present invention;

[0025] Figure 5 Schematic diagram of the internal structure of the sliding oil cylinder and the adjusting seat of the present invention;

[0026] Figure 6 Schematic diagram of the internal structure of the load-sensitive compensation valve of the present invention.

[0027] Wherein, 1, base; 2, bracket; 3, workbench; 4, hydraulic oil tank; 5, plunger pump; 6, gear transmission box; 7, hydraulic motor; 8, pressure compensator body; 9, inlet valve; 10, inlet pipe; 11, outlet valve; 12, outlet pipe; 13, reversing valve; 14, load-sensitive compensation valve; 141, valve body; 142, valve core seat; 143, low-pressure spring valve core; 144, high-pressure spring valve core; 145, piston oil circuit; 146, inlet oil circuit; 147, adjustment circuit; 148, spring cavity; 149, four-valve plate valve stem; 1410, double-valve plate valve stem; 15, fixed pipe; 16, fixed piston; 17, sliding oil cylinder; 18, limit sliding seat; 19, adjustment seat; 20, lifting seat; 21, swash plate connecting rod; 22, return spring; 23, spring seat; 24, lead screw nut; 25, adjustment lead screw; 26, bevel gear drive; 27, adjustment handwheel; 28, supply oil pipe; 29, return oil pipe; 30, drain pipe. Detailed implementation manners

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment:

[0030] As Figure 1-6As shown in the figure, an embodiment of the present invention provides a hydraulic station with a load-sensitive pressure compensator, which includes a base 1 and a bracket 2. The bracket 2 is fixedly connected above the base 1, and a workbench 3 is fixedly connected to the top of the bracket 2. A hydraulic oil tank 4 is fixedly connected to the middle part below the workbench 3. A plunger pump 5 is fixedly connected to one end above the workbench 3. A gear transmission box 6 is arranged at the output end of the plunger pump 5. A hydraulic motor 7 is fixedly connected to one side of the workbench 3 close to the gear transmission box 6. A liquid inlet pipe 10 is arranged below one end of the plunger pump 5 far from the gear transmission box 6. A liquid inlet valve 9 is fixedly communicated with one end of the liquid inlet pipe 10 far from the plunger pump 5. A pressure compensator main body 8 is fixedly connected above the plunger pump 5. A liquid outlet valve 11 is fixedly communicated with one end of the plunger pump 5 far from the gear transmission box 6. The liquid outlet of the liquid outlet valve 11 far from the gear transmission box 6 is fixedly communicated with a liquid outlet pipe 12. A reversing valve 13 is fixedly communicated with one end of the liquid outlet pipe 12 far from the liquid outlet valve 11. Two oil supply pipes 28 are fixedly communicated with both ends above the reversing valve 13;

[0031] The liquid outlet of the liquid outlet valve 11 far from the liquid outlet pipe 12 is fixedly communicated with a load-sensitive compensation valve 14 through a pipeline. The load-sensitive compensation valve 14 includes a valve body 141, a valve core seat 142, a low-pressure spring valve core 143, a high-pressure spring valve core 144, a piston oil circuit 145 and an oil inlet oil circuit 146. A valve core seat 142 is fixedly inlaid in the middle above the valve body 141. Spring cavities 148 are respectively opened on both sides of the valve core seat 142. The low-pressure spring valve core 143 and the high-pressure spring valve core 144 are respectively arranged inside the two spring cavities 148. An adjustment circuit 147 is opened below the inside of the valve body 141. A piston oil circuit 145 is opened on one side of the valve body 141 below close to the low-pressure spring valve core 143. An oil inlet oil circuit 146 is opened on one side of the valve body 141 below close to the high-pressure spring valve core 144. A four-valve plate valve rod 149 is fixedly connected to the bottom of the low-pressure spring valve core 143. A double-valve plate valve rod 1410 is fixedly connected to the bottom of the high-pressure spring valve core 144. The adjustment circuit 147 includes a low-pressure valve core hole corresponding to the four-valve plate valve rod 149, a high-pressure valve core hole corresponding to the double-valve plate valve rod 1410, a bottom communication hole corresponding to the oil inlet oil circuit 146, a middle communication hole corresponding to the piston oil circuit 145 and an upper communication hole located above the middle communication hole. Both ends of the bottom communication hole, the middle communication hole and the upper communication hole are respectively fixedly communicated with the low-pressure valve core hole and the high-pressure valve core hole. An oil discharge communication hole is opened at the bottom of the valve core seat 142. By setting the combination of the valve body and the valve core seat in the load-sensitive compensation valve 14 of the present invention and using the method of separate processing and then combination, the difficulty of internal oil circuit punching and filling can be effectively reduced, and the processing efficiency is improved. Cooperating with the corresponding spring valve core and valve plate valve rod to form a load-sensitive circuit, the flow demand can be adjusted according to the load system pressure, which strengthens the practicability of the present invention;

[0032] In the middle of the upper part of the reversing valve 13, an oil return pipe 29 is fixedly connected. At the position corresponding to the oil return pipe 29 in the upper part inside the reversing valve 13, a jacking check valve is provided. One end of the oil return pipe 29 is fixedly connected to the jacking check valve. A throttle hole communicating with the oil return pipe 29 is opened inside the reversing valve 13, and the throttle hole is communicated with the hydraulic oil tank 4. One side of the oil return pipe 29 away from the reversing valve 13 passes through the pressure compensator body 8 and is communicated with the spring chamber 148 corresponding to the low-pressure spring spool 143. One side below the pressure compensator body 8 close to the reversing valve 13 is fixedly connected with an oil discharge pipe 30. One end of the oil discharge pipe 30 close to the pressure compensator body 8 is communicated with an oil discharge communication hole through a low-pressure spool hole corresponding to the four-valve plate valve stem 149, and the connection hole position of the oil discharge pipe 30 corresponds to the position of the uppermost valve plate of the four-valve plate valve stem 149. One end of the oil discharge pipe 30 away from the pressure compensator body 8 is fixedly connected to the hydraulic oil tank 4;

[0033] On the side of the valve body 141 away from the liquid outlet valve 11, at the position corresponding to the piston oil circuit 145, a fixed pipe 15 is fixedly connected. On the outer side of one end of the fixed pipe 15 away from the load-sensitive compensation valve 14, a fixed piston 16 is fixedly connected. The outer side of the fixed piston 16 is slidably and sealingly connected with a sliding oil cylinder 17. The outer side of the sliding oil cylinder 17 is slidably connected with a limit sliding seat 18. One end of the sliding oil cylinder 17 away from the load-sensitive compensation valve 14 is fixedly connected with an adjusting seat 19. Inside the adjusting seat 19, a lifting seat 20 is slidably connected up and down. The bottom of the lifting seat 20 is rotatably connected with an inclined disk connecting rod 21. One end of the adjusting seat 19 away from the sliding oil cylinder 17 is fixedly connected with a return spring 22. One end of the return spring 22 away from the adjusting seat 19 is fixedly connected with a spring seat 23. Through the load-sensitive compensation valve 14 arranged inside the pressure compensator body 8, the present invention can, under the cooperation of the fixed piston 16, the sliding oil cylinder 17 and the return spring 22, through the action of the reversing valve 13, utilize the liquid outlet pressure of the plunger pump body 5 to adjust the swash plate angle of the plunger pump body 5, so as to ensure that the liquid outlet pressure of the plunger pump body 5 is only higher than the load pressure by the spring pressure of a low-pressure spring spool 144, improve the working efficiency of the hydraulic station, and reduce the power loss and heat generation;

[0034] The outer sides of the adjusting seat 19 and the spring seat 23 are both slidably connected to the inner side of the limit sliding seat 18. A bevel gear drive 26 is fixedly connected above the limit sliding seat 18. An input shaft is arranged in the middle above the bevel gear drive 26. The bevel gear drive 26 is rotatably connected to an adjusting handwheel 27 through the input shaft. An output shaft is arranged in the middle on the side of the bevel gear drive 26 away from the sliding oil cylinder 17. The bevel gear drive 26 is rotatably connected to an adjusting lead screw 25 through the output shaft. A lead screw nut 24 is arranged on the outer side of the adjusting lead screw 25. The adjusting handwheel 27 is in transmission connection with the adjusting lead screw 25 through the bevel gear drive 26. One end of the adjusting lead screw 25 away from the bevel gear drive 26 is rotatably connected to the pressure compensator main body 8. The lower part of the lead screw nut 24 is fixedly connected to the spring seat 23. The compression stroke of the return spring 22 can be adjusted by the adjusting handwheel 27.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic station with a load-sensitive pressure compensator, comprising a base (1) and a bracket (2), characterized in that: Above the base (1), a bracket (2) is fixedly connected. At the top of the bracket (2), a workbench (3) is fixedly connected. In the middle below the workbench (3), a hydraulic oil tank (4) is fixedly connected. At one end above the workbench (3), a plunger pump (5) is fixedly connected. At the output end of the plunger pump (5), a gear transmission box (6) is provided. On one side of the workbench (3) above, close to the gear transmission box (6), a hydraulic motor (7) is fixedly connected. Below one end of the plunger pump (5) away from the gear transmission box (6), a liquid inlet pipe (10) is provided. One end of the liquid inlet pipe (10) away from the plunger pump (5) is fixedly connected and communicated with a liquid inlet valve (9). Above the plunger pump (5), a pressure compensator body (8) is fixedly connected. One end of the plunger pump (5) away from the gear transmission box (6) is fixedly connected and communicated with a liquid outlet valve (11). The liquid outlet of the end of the liquid outlet valve (11) away from the gear transmission box (6) is fixedly connected and communicated with a liquid outlet pipe (12). One end of the liquid outlet pipe (12) away from the liquid outlet valve (11) is fixedly connected and communicated with a reversing valve (13). At both upper ends of the reversing valve (13), oil supply pipes (28) are fixedly connected and communicated; The liquid outlet of the end of the liquid outlet valve (11) away from the liquid outlet pipe (12) is fixedly connected and communicated with a load-sensitive compensation valve (14) through a pipeline. The load-sensitive compensation valve (14) includes a valve body (141), a valve core seat (142), a low-pressure spring valve core (143), a high-pressure spring valve core (144), a piston oil circuit (145) and an oil inlet oil circuit (146). In the middle above the valve body (141), a valve core seat (142) is fixedly inlaid. Spring cavities (148) are respectively opened on both sides of the valve core seat (142). The low-pressure spring valve core (143) and the high-pressure spring valve core (144) are respectively arranged in the two spring cavities (148). An adjustment circuit (147) is opened below the interior of the valve body (141). The piston oil circuit (145) is opened on one side of the valve body (141) below, close to the low-pressure spring valve core (143). The oil inlet oil circuit (146) is opened on one side of the valve body (141) below, close to the high-pressure spring valve core (144). At the bottom of the low-pressure spring valve core (143), a four-valve plate valve rod (149) is fixedly connected. At the bottom of the high-pressure spring valve core (144), a double-valve plate valve rod (1410) is fixedly connected. In the middle above the reversing valve (13), an oil return pipe (29) is fixedly connected and communicated. Below one side of the pressure compensator body (8) close to the reversing valve (13), an oil discharge pipe (30) is fixedly connected; On one side of the valve body (141) away from the liquid outlet valve (11), a fixed pipe (15) is fixedly communicated at a position corresponding to the piston oil passage (145). One end of the fixed pipe (15) away from the load sensing compensation valve (14) is fixedly connected with a fixed piston (16) on the outside. The outside of the fixed piston (16) is slidably and sealingly connected with a sliding oil cylinder (17). The outside of the sliding oil cylinder (17) is slidably connected with a limit sliding seat (18). One end of the sliding oil cylinder (17) away from the load sensing compensation valve (14) is fixedly connected with an adjusting seat (19). An elevating seat (20) is slidably connected up and down inside the adjusting seat (19). The bottom of the elevating seat (20) is rotatably connected with an inclined disk connecting rod (21). One end of the adjusting seat (19) away from the sliding oil cylinder (17) is fixedly connected with a return spring (22). One end of the return spring (22) away from the adjusting seat (19) is fixedly connected with a spring seat (23). Above the limit sliding seat (18), a bevel gear transmission (26) is fixedly connected. In the middle above the bevel gear transmission (26), an input shaft is provided. And the bevel gear transmission (26) is rotatably connected with an adjusting handwheel (27) through the input shaft. In the middle on one side of the bevel gear transmission (26) away from the sliding oil cylinder (17), an output shaft is provided. And the bevel gear transmission (26) is rotatably connected with an adjusting lead screw (25) through the output shaft. A lead screw nut (24) is arranged on the outside of the adjusting lead screw (25).

2. The hydraulic station with a load-sensitive pressure compensator according to claim 1, characterized in that: The adjusting circuit (147) includes a low-pressure valve core hole corresponding to the four-valve plate valve rod (149), a high-pressure valve core hole corresponding to the double-valve plate valve rod (1410), a bottom communication hole corresponding to the oil inlet passage (146), a middle communication hole corresponding to the piston oil passage (145), and an upper communication hole located above the middle communication hole. Both ends of the bottom communication hole, the middle communication hole, and the upper communication hole are respectively fixedly communicated with the low-pressure valve core hole and the high-pressure valve core hole. An oil discharge communication hole is opened at the bottom of the valve core seat (142).

3. A hydraulic station with a load-sensitive pressure compensator according to claim 1, characterized in that: Above the inside of the reversing valve (13), a lifting one-way valve is arranged at a position corresponding to the return oil pipe (29). One end of the return oil pipe (29) is fixedly communicated with the lifting one-way valve. A throttle hole communicated with the return oil pipe (29) is opened inside the reversing valve (13), and the throttle hole is communicated with the hydraulic oil tank (4).

4. A hydraulic station with a load-sensitive pressure compensator according to claim 1, characterized in that: One side of the return oil pipe (29) away from the reversing valve (13) passes through the pressure compensator main body (8) and is communicated with the spring cavity (148) corresponding to the low-pressure spring valve core (143).

5. The hydraulic station with a load-sensitive pressure compensator according to claim 2, characterized in that: One end of the oil discharge pipe (30) close to the pressure compensator main body (8) is communicated with the oil discharge communication hole through the low-pressure valve core hole corresponding to the four-valve plate valve rod (149), and the connection hole position of the oil discharge pipe (30) corresponds to the uppermost valve plate position of the four-valve plate valve rod (149). One end of the oil discharge pipe (30) away from the pressure compensator main body (8) is fixedly communicated with the hydraulic oil tank (4).

6. The hydraulic station with a load-sensitive pressure compensator according to claim 1, characterized in that: The outsides of the adjusting seat (19) and the spring seat (23) are both slidably connected with the inside of the limit sliding seat (18).

7. A hydraulic station with a load-sensitive pressure compensator according to claim 1, characterized in that: The adjusting handwheel (27) is drivingly connected to the adjusting lead screw (25) through a bevel gear drive (26). One end of the adjusting lead screw (25) away from the bevel gear drive (26) is rotatably connected to the pressure compensator body (8). The lower part of the lead screw nut (24) is fixedly connected to the spring seat (23).

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