Pressure compensation device for hydraulic equipment

Abstract

A pressure compensation device for hydraulic equipment belongs to the field of hydraulic equipment and comprises a pressure release mechanism and a pressure compensation mechanism. The pressure release mechanism comprises a pressure release cylinder body, a hollow rod and a high-pressure piston plate; the pressure compensation mechanism is arranged at the liquid outlet end of the hollow rod and comprises a constant pressure release assembly, a first one-way valve and a second one-way valve. The hollow rod penetrates through the interior of the high-pressure piston plate, the one-way plug is arranged at the bottom of the high-pressure piston plate, after the high-pressure piston plate ascends to a certain height, the hollow rod ejects the one-way plug at the bottom of the high-pressure piston plate, high-pressure fluid is guided out through the hollow rod, and therefore the high-pressure condition of hydraulic oil is released; in addition, constant-pressure discharging is achieved through the constant-pressure releasing assembly, constant-pressure hydraulic oil is fed into the hydraulic pipeline again, the low-pressure condition of the hydraulic oil is compensated, and the pressure of the hydraulic pipeline is protected.

Description

Technical Field

[0001] This invention relates to the field of hydraulic equipment technology, specifically to a pressure compensation device for hydraulic equipment. Background Technology

[0002] Hydraulic equipment is a commonly used power transmission device in the industrial field. It converts mechanical energy into fluid pressure energy through a hydraulic pump, which then drives hydraulic cylinders and other actuators via pipelines and control valves to achieve precise force and motion control. It is widely used in engineering machinery, metallurgy, machine tools, and other fields. During operation, hydraulic systems are susceptible to factors such as sudden load changes, pipeline leaks, and oil contamination, leading to unstable pressure. Excessive pressure can damage valves and seals, while insufficient pressure causes sluggish action and insufficient output from actuators, severely affecting the equipment's operational accuracy and lifespan. Therefore, pressure compensation devices are necessary to maintain stable system pressure. Existing hydraulic compensation devices have significant drawbacks: when facing overload pressure, they mostly rely on mechanical components such as relief valves for passive unloading, with a response delay of up to tens of milliseconds, making it unable to sensitively alleviate sudden overload pressure and easily causing impact damage to the equipment; for low-pressure compensation, fixed displacement pump oil replenishment or accumulator energy storage schemes are often used, which have low oil replenishment accuracy and slow response. Under continuous leakage or light load conditions, it is difficult to replenish pressure in time, resulting in poor system pressure holding capacity and further reducing the reliability of equipment operation. Summary of the Invention

[0003] In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide a pressure compensation device for hydraulic equipment, so as to at least partially solve the problems mentioned in the background art.

[0004] Therefore, the purpose of this invention is to provide a pressure compensation device for hydraulic equipment, which releases and compensates for high and low pressure conditions, and protects the pressure of hydraulic pipelines.

[0005] To achieve the above objectives, the present invention proposes a pressure compensation device for hydraulic equipment, comprising a pressure release mechanism and a pressure compensation mechanism. The pressure release mechanism includes a pressure relief cylinder, a hollow rod, and a high-pressure piston plate. An oil inlet pipe is provided at the bottom of the pressure relief cylinder. The high-pressure piston plate is disposed inside the pressure relief cylinder, and a first compression spring is provided at the top of the high-pressure piston plate. A one-way plug is hinged to the bottom of the high-pressure piston plate. The hollow rod passes through the inner side of the high-pressure piston plate. The pressure compensation mechanism is located at the outlet end of the hollow rod and includes a constant pressure release assembly, a first check valve, and a second check valve. The outlet end of the hollow rod is connected to the first check valve, the outlet end of the first check valve is connected to the inlet end of the constant pressure release assembly, and the outlet end of the constant pressure release assembly is connected to the inlet end of the second check valve. An oil drain pipe is provided at the outlet end of the second check valve.

[0006] Furthermore, the high-pressure piston plate is provided with an adjustment seat that extends through both ends. The height of the adjustment seat is greater than the thickness of the high-pressure piston plate. A piston ring is sleeved on the bottom of the hollow rod, and the hollow rod is slidably disposed inside the adjustment seat through the piston ring.

[0007] Furthermore, a first elastic telescopic cover is provided between the bottom edge of the high-pressure piston plate and the inner wall of the pressure relief cylinder.

[0008] Furthermore, the oil outlet end of the hollow rod is provided with an oil return pipe, which is connected to the first check valve, and a hydraulic hose is provided on the oil return pipe.

[0009] Furthermore, the oil outlet of the first check valve is provided with a pressure recovery assembly, including a first hydraulic motor, a second hydraulic motor, and a hydraulic oil tank. The oil inlet of the first hydraulic motor is connected to the oil outlet of the first check valve, the oil outlet of the first hydraulic motor is connected to the top of the hydraulic oil tank, the oil inlet of the second hydraulic motor is connected to the bottom of the hydraulic oil tank, the oil outlet of the second hydraulic motor is connected to the constant pressure release assembly, the shafts of the first hydraulic motor and the second hydraulic motor are connected to each other by a connecting shaft, and the top of the hydraulic oil tank is provided with an oil tank vent.

[0010] Furthermore, the oil outlet end of the second hydraulic motor is provided with a pressure storage assembly, including a pressure cylinder, a second compression spring and a pressure cylinder piston, wherein the pressure cylinder piston is disposed inside the pressure cylinder, the second compression spring is disposed on the top of the pressure cylinder piston, the bottom of the pressure cylinder is connected to the oil outlet end of the second hydraulic motor, and the bottom of the pressure cylinder is also connected to a constant pressure release assembly.

[0011] Furthermore, an adjusting plate is provided on the top of the second compression spring, and a pressure adjusting screw is rotatably provided on the adjusting plate. The pressure adjusting screw is threaded through the top of the pressure cylinder, and a pressure cylinder vent is also provided on the top of the pressure cylinder.

[0012] Furthermore, a second elastic telescopic cover is provided between the bottom edge of the pressure cylinder piston and the inner wall of the pressure cylinder.

[0013] Furthermore, the constant pressure release assembly includes a constant speed flow valve and a pressure limiting valve, wherein the constant speed flow valve and the pressure limiting valve are connected in series, the oil inlet of the constant speed flow valve is connected to the bottom of the pressure cylinder, the bottom of the pressure limiting valve is connected to a second check valve, and an adjusting valve stem is provided at the bottom of the pressure limiting valve.

[0014] Furthermore, a first telescopic rod is provided at the top of the pressure relief cylinder, and the output shaft of the first telescopic rod is connected to the top of the hollow rod.

[0015] Beneficial effects: The hollow rod of this invention penetrates the interior of the high-pressure piston plate, and a one-way plug is set at the bottom of the high-pressure piston plate. The hydraulic oil in the hydraulic pipeline enters the area below the high-pressure piston plate through the oil inlet pipe, and drives the high-pressure piston plate to squeeze the first compression spring. When the high-pressure piston plate rises to a certain height, the hollow rod pushes open the one-way plug at the bottom of the high-pressure piston plate, and the high-pressure fluid is discharged through the hollow rod. At this time, the fluid pressure decreases, the position of the high-pressure piston plate drops, and the one-way plug closes again, thereby releasing the high pressure of the hydraulic oil. In addition, the discharged hydraulic oil is unidirectionally guided through the first one-way valve and the second one-way valve, and discharged under constant pressure through the constant pressure release component. The constant pressure hydraulic oil is sent back into the hydraulic pipeline to compensate for the low pressure of the hydraulic oil and protect the pressure of the hydraulic pipeline.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the overall structure of a pressure compensation device for a hydraulic device according to an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of a pressure compensation device for a hydraulic device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a pressure compensation device for a hydraulic device according to an embodiment of the present invention from another perspective; Figure 4 This is a partial cross-sectional view of a pressure compensation device for a hydraulic system according to an embodiment of the present invention; Figure 5 A cross-sectional view of a pressure storage component in a pressure compensation device for a hydraulic device according to an embodiment of the present invention; Figure 6 This is a cross-sectional view of a constant pressure release component in a pressure compensation device for a hydraulic device according to an embodiment of the present invention.

[0018] As shown in the figure: 1. Pressure relief mechanism; 11. First telescopic rod; 12. Oil inlet pipe; 13. Pressure relief cylinder; 14. First compression spring; 15. Hollow rod; 151. Piston ring; 16. High-pressure piston plate; 161. Adjusting seat; 162. One-way plug; 17. First elastic telescopic cover; 2. Pressure compensation mechanism; 21. Return oil pipe; 211. Hydraulic hose; 22. First check valve; 221. First oil delivery pipe; 23. Pressure recovery assembly; 231. Connecting shaft; 232. Second hydraulic motor; 233. First hydraulic... 24. Motor; 241. Hydraulic oil tank; 25. Oil tank breather; 26. Pressure storage assembly; 27. Pressure regulating screw; 28. Regulating plate; 29. ​​Second compression spring; 20. Pressure cylinder; 20. Pressure cylinder piston; 21. Pressure cylinder breather; 22. Second oil supply pipe; 23. Third oil supply pipe; 24. Second elastic telescopic cover; 25. Constant pressure release assembly; 26. Protective shell; 27. Constant speed flow valve; 28. Pressure limiting valve; 29. ​​Regulating valve stem; 20. Oil drain pipe; 20. Hydraulic pipeline. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] The pressure compensation device for hydraulic equipment according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0021] like Figures 2-4 As shown, the pressure compensation device for hydraulic equipment provided in this embodiment of the invention includes a pressure relief mechanism 1 and a pressure compensation mechanism 2. The pressure relief mechanism 1 includes a pressure relief cylinder 13, a hollow rod 15 and a high-pressure piston plate 16. An oil inlet pipe 12 is provided at the bottom of the pressure relief cylinder 13. The high-pressure piston plate 16 is disposed inside the pressure relief cylinder 13. A first compression spring 14 is provided at the top of the high-pressure piston plate 16. A single-pass plug 162 is hinged at the bottom of the high-pressure piston plate 16. The hollow rod 15 is disposed through the inner side of the high-pressure piston plate 16.

[0022] The pressure compensation mechanism 2 is located at the liquid outlet end of the hollow rod 15 and includes a constant pressure release component 26, a first check valve 22, and a second check valve 27. The oil outlet end of the hollow rod 15 is connected to the first check valve 22, the oil outlet end of the first check valve 22 is connected to the oil inlet end of the constant pressure release component 26, the oil outlet end of the constant pressure release component 26 is connected to the oil inlet end of the second check valve 27, and the oil outlet end of the second check valve 27 is provided with an oil drain pipe 3.

[0023] Specifically, when the pressure compensation device of this application is used, the oil inlet pipe 12 and the oil outlet pipe 3 are both connected to the hydraulic pipeline 4. When the hydraulic pipeline 4 is under high pressure, the hydraulic oil squeezes the high-pressure piston plate 16 and the first compression spring 14. When the high-pressure piston plate 16 rises to a certain height, the hollow rod 15 pushes open the single-pass plug 162 at the bottom of the high-pressure piston plate 16, and the high-pressure fluid is discharged through the hollow rod 15. At this time, the hydraulic oil pressure below the high-pressure piston plate 16 decreases, and the high-pressure piston plate 16 is lowered by the downward pressure of the first compression spring 14. The single-pass plug 162 leaves the hollow rod 15 and closes again, thereby completing the release of the high pressure of the hydraulic oil.

[0024] When the hydraulic line 4 is under low pressure, the hydraulic oil discharged from the hollow rod 15 is unidirectionally guided through the first check valve 22 and the second check valve 27, and discharged under constant pressure through the constant pressure release component 26. The constant pressure hydraulic oil is then sent back into the hydraulic line 4 to compensate for the low pressure of the hydraulic oil and protect the pressure of the hydraulic line 4.

[0025] In one embodiment of the present invention, such as Figure 4 As shown, the high-pressure piston plate 16 is provided with an adjustment seat 161 that extends through both ends, and a piston ring 151 is sleeved on the bottom of the hollow rod 15. The hollow rod 15 is slidably disposed inside the adjustment seat 161 through the piston ring 151.

[0026] Specifically, during the downward movement of the hollow rod 15 relative to the adjusting seat 161, in order to prevent the hydraulic oil below the adjusting seat 161 from being isolated, a piston ring 151 is fitted at the bottom of the hollow rod 15 to ensure that the hydraulic oil below the high-pressure piston plate 16 is isolated during the up-and-down sliding of the hollow rod 15.

[0027] In one embodiment of the present invention, such as Figure 4 As shown, the height of the adjusting seat 161 is greater than the thickness of the high-pressure piston plate 16, and a first elastic telescopic cover 17 is provided between the bottom edge of the high-pressure piston plate 16 and the inner wall of the pressure relief cylinder 13.

[0028] Specifically, since the edge of the high-pressure piston plate 16 is thinner than the upper and lower thickness of the adjusting seat 161, on the one hand, the influence of the high-pressure piston plate 16's own inertia is reduced, making the movement of the high-pressure piston plate 16 more sensitive to changes in hydraulic oil pressure. In addition, a first elastic telescopic cover 17 is provided at the bottom of the high-pressure piston plate 16, so that the contact area of ​​the high-pressure piston plate 16 can be larger. Furthermore, during the up-and-down movement of the high-pressure piston plate 16, the hydraulic oil below the high-pressure piston plate 16 is completely isolated to prevent inadequate sealing.

[0029] In one embodiment of the present invention, such as Figure 4As shown, the oil outlet end of the hollow rod 15 is provided with an oil return pipe 21, which is connected to the first check valve 22. A hydraulic hose 211 is provided on the oil return pipe 21 to facilitate the smooth discharge of hydraulic oil from the hollow rod 15.

[0030] In one embodiment of the present invention, such as Figure 4 As shown, the oil outlet of the first check valve 22 is provided with a pressure recovery assembly 23, which includes a first hydraulic motor 233, a second hydraulic motor 232 and a hydraulic oil tank 24. The oil inlet of the first hydraulic motor 233 is connected to the oil outlet of the first check valve 22, and the oil outlet of the first hydraulic motor 233 is connected to the top of the hydraulic oil tank 24.

[0031] The oil inlet of the second hydraulic motor 232 is connected to the bottom of the hydraulic oil tank 24, and the oil outlet of the second hydraulic motor 232 is connected to the constant pressure release component 26. The shafts of the first hydraulic motor 233 and the second hydraulic motor 232 are connected to each other by a connecting shaft 231. The top of the hydraulic oil tank 24 is provided with an oil tank vent 241.

[0032] Specifically, in order to fully collect and utilize the high-pressure potential energy of the high-pressure hydraulic oil, the high-pressure hydraulic oil enters the first check valve 22 through the return oil pipe 21, hydraulic hose 211 and first oil delivery pipe 221, and then enters the first hydraulic motor 233, driving the first hydraulic motor 233 to rotate. The high-pressure hydraulic oil becomes low-pressure hydraulic oil and enters the hydraulic oil tank 24 for storage. At the same time, the first hydraulic motor 233 drives the second hydraulic motor 232 to rotate through the connecting shaft 231. The second hydraulic motor 232 repressurizes the hydraulic oil in the hydraulic oil tank 24 and sends it into the pressure storage component 25 to store it as high-pressure hydraulic oil, reducing the waste of pressure potential energy.

[0033] In one embodiment of the present invention, such as Figure 5 As shown, the oil outlet end of the second hydraulic motor 232 is provided with a pressure storage component 25, which includes a pressure cylinder 254, a second compression spring 253 and a pressure cylinder piston 255. The pressure cylinder piston 255 is located inside the pressure cylinder 254, the second compression spring 253 is located on the top of the pressure cylinder piston 255, the bottom of the pressure cylinder 254 is connected to the oil outlet end of the second hydraulic motor 232, and the bottom of the pressure cylinder 254 is connected to the constant pressure release component 26 through a third oil supply pipe 258.

[0034] Specifically, after the high-pressure hydraulic oil enters the bottom of the pressure cylinder 254 through the second oil supply pipe 257, the high-pressure hydraulic oil squeezes the second compression spring 253 and the pressure cylinder piston 255 and is stored inside the pressure cylinder 254.

[0035] In one embodiment of the present invention, such as Figure 5As shown, an adjusting plate 252 is provided on the top of the second compression spring 253, and a pressure adjusting screw 251 is rotatably provided on the adjusting plate 252. The pressure adjusting screw 251 is threaded through the top of the pressure cylinder 254, and a pressure cylinder breather hole 256 is also provided on the top of the pressure cylinder 254.

[0036] Specifically, in order to adjust the pressure potential energy inside the pressure cylinder 254, the pressure adjusting screw 251 is rotated to drive the adjusting plate 252 to move up and down, thereby adjusting the initial pressure value of the second compression spring 253, and thus adjusting the pressure potential energy inside the pressure cylinder 254.

[0037] In one embodiment of the present invention, such as Figure 5 As shown, a second elastic telescopic cover 259 is provided between the bottom edge of the pressure cylinder piston 255 and the inner wall of the pressure cylinder 254 to ensure the sealing of the bottom of the pressure cylinder piston 255 during the up and down movement of the pressure cylinder piston 255.

[0038] In one embodiment of the present invention, such as Figure 6 As shown, the constant pressure release assembly 26 includes a constant speed flow valve 262 and a pressure relief valve 263. The constant speed flow valve 262 and the pressure relief valve 263 are externally protected by a protective shell 261. The constant speed flow valve 262 and the pressure relief valve 263 are connected in series. The oil inlet end of the constant speed flow valve 262 is connected to the bottom of the pressure cylinder 254. The bottom of the pressure relief valve 263 is connected to the second check valve 27. The bottom of the pressure relief valve 263 is provided with an adjusting valve stem 264, which is adjusted according to the low pressure compensation value of the hydraulic pipeline 4.

[0039] Specifically, the high-pressure hydraulic oil inside the pressure cylinder 254 is stabilized after passing through the constant speed flow valve 262, and then discharged to the hydraulic pipeline 4 through the pressure relief valve 263. During this process, when the pressure difference across the pressure relief valve 263 reaches the pressure limit value, the pressure relief valve 263 is opened. Then, when the hydraulic pressure in the hydraulic pipeline 4 is low, the pressure difference across the pressure relief valve 263 increases and opens when it reaches the pressure limit value, thus exporting the hydraulic oil fluid with stable pressure to the hydraulic pipeline 4 to compensate for the pipeline pressure.

[0040] In one embodiment of the present invention, such as Figure 4 As shown, a first telescopic rod 11 is provided on the top of the pressure relief cylinder 13, and the output shaft of the first telescopic rod 11 is connected to the top of the hollow rod 15.

[0041] Specifically, the position of the bottom end of the hollow rod 15 is controlled by the extension and retraction of the first telescopic rod 11, thereby adjusting the opening pressure value of the single-pass plug 162 (the higher the hollow rod 15 is, the greater the opening pressure value of the single-pass plug 162), and thus adjusting the high pressure discharge value of the hydraulic oil.

[0042] To clearly illustrate the above embodiments, refer to Figures 1-6The working principle of the pressure compensation device for hydraulic equipment of the present invention is as follows: Before using the pressure compensation device of this application, the oil inlet pipe 12 and the oil outlet pipe 3 are both connected to the hydraulic pipeline 4, and the position of the bottom end of the hollow rod 15 is controlled by the extension and retraction of the first telescopic rod 11 to adjust the high pressure discharge value of the hydraulic oil; at the same time, the adjusting valve rod 264 at the bottom of the pressure limiting valve 263 is adjusted to adjust the low pressure compensation value of the hydraulic pipeline 4.

[0043] When the hydraulic line 4 is under high pressure, the hydraulic oil squeezes the high-pressure piston plate 16 and the first compression spring 14. When the high-pressure piston plate 16 rises to a certain height (at which point the hydraulic oil reaches the high pressure limit value), the hollow rod 15 pushes open the single-way plug 162 at the bottom of the high-pressure piston plate 16, and the high-pressure fluid is discharged through the hollow rod 15. At this time, the hydraulic oil pressure below the high-pressure piston plate 16 decreases, and the high-pressure piston plate 16 is lowered by the downward pressure of the first compression spring 14. The single-way plug 162 leaves the hollow rod 15 and closes again, thereby releasing the high pressure of the hydraulic oil and protecting the pressure of the hydraulic line 4.

[0044] Subsequently, the high-pressure hydraulic oil enters the first check valve 22 through the return oil pipe 21 and then enters the first hydraulic motor 233, driving the first hydraulic motor 233 to rotate. The high-pressure hydraulic oil becomes low-pressure hydraulic oil and enters the hydraulic oil tank 24 for storage. At the same time, the first hydraulic motor 233 drives the second hydraulic motor 232 to rotate through the connecting shaft 231. The second hydraulic motor 232 repressurizes the hydraulic oil in the hydraulic oil tank 24 and sends it into the pressure storage component 25 for storage as high-pressure hydraulic oil. During this process, the high-pressure hydraulic oil enters the bottom of the pressure cylinder 254 through the second oil supply pipe 257. The high-pressure hydraulic oil then compresses the second compression spring 253 and the pressure cylinder piston 255 and is stored inside the pressure cylinder 254.

[0045] Finally, the high-pressure hydraulic oil inside the pressure cylinder 254 is stabilized after passing through the constant speed flow valve 262, and then discharged to the hydraulic pipeline 4 through the pressure relief valve 263. During this process, when the pressure difference across the pressure relief valve 263 reaches the pressure limit value, the pressure relief valve 263 is opened. Then, when the hydraulic pressure in the hydraulic pipeline 4 is low, the pressure difference across the pressure relief valve 263 increases and opens when it reaches the pressure limit value, thus exporting the hydraulic oil fluid with stable pressure to the hydraulic pipeline 4 to compensate for the low pressure in the pipeline.

[0046] In summary, this invention uses a hollow rod penetrating the interior of the high-pressure piston plate and a one-way plug at the bottom of the high-pressure piston plate. Hydraulic oil in the hydraulic pipeline enters below the high-pressure piston plate through the inlet pipe, causing the high-pressure piston plate to compress the first compression spring. When the high-pressure piston plate rises to a certain height, the hollow rod opens the one-way plug at the bottom of the high-pressure piston plate, and the high-pressure fluid is discharged through the hollow rod. At this time, the fluid pressure decreases, the position of the high-pressure piston plate drops, and the one-way plug closes again, thereby releasing the high pressure of the hydraulic oil. In addition, the discharged hydraulic oil is unidirectionally guided through the first and second check valves and discharged under constant pressure through the constant pressure release component. The constant pressure hydraulic oil is then sent back into the hydraulic pipeline to compensate for the low pressure of the hydraulic oil and protect the pressure of the hydraulic pipeline.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pressure compensating device for a hydraulic apparatus, characterized by comprising: The utility model provides a pressure release mechanism (1) and pressure compensation mechanism (2) are included, wherein, the pressure release mechanism (1) includes pressure relief cylinder body (13), hollow rod (15) and high pressure piston plate (16), the bottom of pressure relief cylinder body (13) is provided with oil inlet pipe (12), high pressure piston plate (16) is arranged in the inside of pressure relief cylinder body (13), the top of high pressure piston plate (16) is provided with first compression spring (14), the bottom of high pressure piston plate (16) is hingedly provided with single pass plug (162), hollow rod (15) is arranged in the inside of high pressure piston plate (16) through; The pressure compensation mechanism (2) is arranged at the liquid outlet end of the hollow rod (15) and includes a constant pressure release assembly (26), a first one-way valve (22), and a second one-way valve (27). The oil outlet end of the first one-way valve (22) is connected to the oil inlet end of the constant pressure release assembly (26). The oil outlet end of the constant pressure release assembly (26) is connected to the oil inlet end of the second one-way valve (27). The oil outlet end of the second one-way valve (27) is provided with an oil discharge pipe (3).

2. The pressure compensator for hydraulic equipment according to claim 1, characterized by The high pressure piston plate (16) is provided with an adjusting seat (161) penetrating through both ends. The height of the adjusting seat (161) is greater than the thickness of the high pressure piston plate (16). The bottom of the hollow rod (15) is provided with a piston ring (151). The hollow rod (15) is slidably arranged in the inside of the adjusting seat (161) through the piston ring (151).

3. The pressure compensator for hydraulic equipment according to claim 2, characterized in that, The bottom edge portion of the high pressure piston plate (16) and the inner wall of the pressure relief cylinder body (13) are provided with a first elastic expansion cover (17).

4. The pressure compensator for hydraulic equipment according to claim 2, characterized by The oil outlet end of the hollow rod (15) is provided with an oil return pipe (21). The oil return pipe (21) is connected to the first one-way valve (22). The oil return pipe (21) is provided with a hydraulic hose (211).

5. The pressure compensator for hydraulic equipment according to claim 1, characterized by The oil outlet end of the first one-way valve (22) is provided with a pressure recovery assembly (23) including a first hydraulic motor (233), a second hydraulic motor (232), and a hydraulic oil tank (24). The oil inlet end of the first hydraulic motor (233) is connected to the oil outlet end of the first one-way valve (22). The oil outlet end of the first hydraulic motor (233) is in communication with the top of the hydraulic oil tank (24). The oil inlet end of the second hydraulic motor (232) is in communication with the bottom of the hydraulic oil tank (24). The oil outlet end of the second hydraulic motor (232) is connected to the constant pressure release assembly (26). The shafts of the first hydraulic motor (233) and the second hydraulic motor (232) are connected to each other through a connecting shaft (231). The top of the hydraulic oil tank (24) is provided with an oil tank breathing hole (241).

6. The pressure compensator for hydraulic equipment according to claim 5, characterized in that, The oil outlet end of the second hydraulic motor (232) is provided with a pressure storage assembly (25), including a pressure cylinder (254), a second compression spring (253) and a pressure cylinder piston (255), wherein the pressure cylinder piston (255) is arranged inside the pressure cylinder (254), the second compression spring (253) is arranged on the top of the pressure cylinder piston (255), the bottom of the pressure cylinder (254) is connected with the oil outlet end of the second hydraulic motor (232), and the bottom of the pressure cylinder (254) is further connected with a constant pressure release assembly (26).

7. The pressure compensator for hydraulic equipment according to claim 6, characterized in that, The top of the second compression spring (253) is provided with an adjusting pressure plate (252), the adjusting pressure plate (252) is rotatably provided with a pressure adjusting screw rod (251), the pressure adjusting screw rod (251) is threaded through the top of the pressure cylinder (254), and the top of the pressure cylinder (254) is further provided with a pressure cylinder breathing hole (256).

8. The pressure compensator for hydraulic equipment according to claim 6, characterized by The bottom edge part of the pressure cylinder piston (255) is provided with a second elastic expansion cover (259) between the inner wall of the pressure cylinder (254).

9. The pressure compensator for hydraulic equipment according to claim 6, characterized by The constant pressure release assembly (26) includes a constant speed flow valve (262) and a pressure limiting valve (263), wherein the constant speed flow valve (262) and the pressure limiting valve (263) are connected with each other in series, the oil inlet end of the constant speed flow valve (262) is connected with the bottom of the pressure cylinder (254), the bottom of the pressure limiting valve (263) is connected with a second one-way valve (27), and the bottom of the pressure limiting valve (263) is provided with an adjusting valve rod (264).

10. The pressure compensator for hydraulic equipment according to claim 1, characterized by The top of the pressure release cylinder body (13) is provided with a first telescopic rod (11), and the output shaft of the first telescopic rod (11) is connected with the top of the hollow rod (15).

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