A pressure protection device for hydraulic equipment

Abstract

A pressure protection device for hydraulic equipment relates to the field of hydraulic equipment, and comprises a pressure protection mechanism (4) connected in parallel to a hydraulic pipeline (1). The pressure protection mechanism (4) is used to protect the hydraulic oil in the hydraulic pipeline (1) from high pressure and unstable pressure. The pressure protection mechanism (4) comprises an oil inlet assembly (41), an oil outlet assembly (45), and a storage tank assembly (44) arranged between the oil inlet assembly (41) and the oil outlet assembly (45). The storage tank assembly (44) is used to stabilize the pressure of the hydraulic oil. The storage tank assembly (44) comprises a storage tank (441) that can undergo pressure deformation. The pressure protection device for hydraulic equipment of the present invention is connected in parallel to the hydraulic pipeline via the storage tank assembly that can undergo pressure deformation. When the pressure inside the hydraulic pipeline changes, the hydraulic oil in the storage tank assembly enters and exits the hydraulic pipeline, thereby preventing the hydraulic oil in the hydraulic pipeline from being high pressure or unstable pressure, reducing the load on the hydraulic equipment, and preventing leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic equipment, and in particular to a pressure protection device for hydraulic equipment. Background Art

[0002] As an indispensable part of the modern industrial field, hydraulic equipment has been widely used in various industries and has played an important role in promoting the development of modern industry. In the field of engineering machinery, hydraulic equipment is used in large machinery such as excavators and loaders. It provides these machines with powerful power and precise control, enabling the machinery to complete various complex tasks. In the manufacturing industry, hydraulic equipment can be used in the drive and control systems of various machine tools. Through precise hydraulic control, machine tools can achieve high-precision processing operations. In the aerospace field, hydraulic systems are essential for key functions such as aircraft control and landing gear retraction and extension. However, with the continuous expansion of applications, hydraulic equipment also faces some challenges. On the one hand, the complexity of the hydraulic system increases the difficulty of maintenance and troubleshooting. The hydraulic system consists of multiple components, including pumps, valves, cylinders, etc., and the failure of any component may cause the failure of the entire system. On the other hand, the performance requirements for hydraulic equipment are also getting higher and higher. For example, in some high-precision applications, the hydraulic system is required to have higher control accuracy and response speed. In order to solve these problems, hydraulic technology continues to develop and innovate. In terms of hydraulic components, new high-performance pumps and valves continue to emerge, improving the efficiency and reliability of the system. In terms of control technology, the application of intelligent control algorithms and sensors has significantly improved the control accuracy and response speed of hydraulic systems. In addition, people are constantly exploring new materials and new processes to improve the performance of hydraulic equipment and reduce costs. In short, hydraulic equipment plays an important role in modern industry, but it also faces some challenges. Through continuous technological innovation and development, hydraulic equipment will continue to provide strong support for the development of various fields.

[0003] In modern industry, hydraulic pipeline systems are widely used in various mechanical equipment to provide power and control for them. The hydraulic system we are familiar with is usually composed of pumps, pipelines, control valves and actuators. However, the unstable performance of the pump in the hydraulic pipeline may generate excessive pressure. Failure or improper adjustment of the control valve may also cause pressure fluctuations. In this case, the hazards mainly include the following aspects. First, high pressure will increase the load on the pipeline and components, leading to fatigue and premature damage. This may cause oil leakage, pipeline rupture and other faults, affecting the normal operation of the system. The increase in temperature in the hydraulic pipeline causes thermal expansion of the hydraulic oil, which in turn causes the pressure to increase. The above pressure instability will affect the control accuracy and response speed of the system, thereby reducing the working quality and efficiency of the equipment. In addition, high pressure and pressure instability may also cause safety problems. For example, pipeline rupture may cause hydraulic oil leakage, which will not only cause environmental pollution, but also may cause harm to the operator. Therefore, high pressure and unstable pressure in hydraulic pipelines will bring a series of hazards. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the first purpose of the present invention is to provide a pressure protection device for hydraulic equipment. When the internal pressure of the hydraulic pipeline changes, the hydraulic oil in the pressure protection device enters and exits the hydraulic pipeline, preventing the hydraulic oil in the hydraulic pipeline from being high or unstable, reducing the load on the hydraulic equipment and preventing leakage.

[0006] To achieve the above-mentioned purpose, the first aspect of the present invention proposes a pressure protection device for hydraulic equipment, including a pressure protection mechanism connected in parallel to the hydraulic pipeline, the pressure protection mechanism is used to protect the hydraulic oil in the hydraulic pipeline from high pressure and unstable pressure, the pressure protection mechanism includes an oil inlet assembly, an oil outlet assembly, and a storage tank assembly arranged between the oil inlet assembly and the oil outlet assembly, the oil inlet end of the oil inlet assembly is connected to the hydraulic pipeline, the oil outlet end of the oil outlet assembly is connected to the hydraulic pipeline, the storage tank assembly is used to stabilize the pressure of the hydraulic oil, the storage tank assembly includes a storage tank that can undergo pressure deformation, and the two ends of the storage tank are respectively connected to the oil inlet assembly and the oil outlet assembly.

[0007] In addition, the pressure protection device for hydraulic equipment according to the present invention may also have the following additional technical features:

[0008] In one embodiment of the present invention, the oil inlet assembly includes an oil inlet pipe, an oil inlet check valve and an oil inlet pressure valve, wherein the two ends of the oil inlet pipe are respectively connected to the hydraulic pipeline and the storage tank assembly, the oil inlet pressure valve is arranged at the oil inlet end of the oil inlet pipe, and the oil inlet check valve is arranged at the oil outlet end of the oil inlet pipe.

[0009] In one embodiment of the present invention, the oil outlet assembly includes an oil outlet pipe and an oil outlet one-way valve, wherein the oil outlet pipe is arranged between the storage tank assembly and the hydraulic pipeline, and the oil outlet one-way valve is arranged between the storage tank assembly and the hydraulic pipeline.

[0010] In one embodiment of the present invention, a pressure regulating assembly is provided on the storage tank, wherein the pressure regulating assembly includes a buffer cylinder, a piston and an adjusting rod unit, wherein the buffer cylinder is provided on the storage tank, the piston is provided in the buffer cylinder, the adjusting rod unit is connected to the piston, and the adjusting rod unit is used to adjust the position of the piston.

[0011] In one embodiment of the present invention, the adjusting rod unit includes a sliding rod and a threaded rod connected in one piece, the threaded rod has an external threaded sleeve provided thereon, a vertical guide sliding rod is provided outside the threaded sleeve, and the guide sliding rod vertically penetrates the buffer cylinder.

[0012] In one embodiment of the present invention, a sliding sleeve is provided on the outer side of the sliding rod, a buffer spring is provided between the sliding sleeve and the threaded sleeve, and bearings are provided at both ends of the buffer spring.

[0013] In one embodiment of the present invention, the diameter of the threaded rod is smaller than the diameter of the sliding rod.

[0014] In one embodiment of the present invention, a filter element groove is provided inside the storage tank, and a detachable filter element is arranged inside the filter element groove.

[0015] In one embodiment of the present invention, a heat exchange component is arranged between the oil outlet one-way valve and the hydraulic pipeline, and the heat exchange component includes heat exchange fins and heat exchange tubes. The heat exchange tubes are made of high thermal conductivity metal material, and the heat exchange fins are in contact with the heat exchange tubes.

[0016] In one embodiment of the present invention, a limited pressure discharge valve is provided between the oil inlet check valve and the oil inlet pressure valve.

[0017] Beneficial effect: The present invention connects a pressure-deformable storage tank assembly in parallel with the hydraulic pipeline. When the internal pressure of the hydraulic pipeline changes, the hydraulic oil in the storage tank assembly enters and exits the hydraulic pipeline, preventing the hydraulic oil in the hydraulic pipeline from being high-pressure or unstable, reducing the load on the hydraulic equipment and preventing leakage.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A schematic structural diagram of a pressure protection device for hydraulic equipment according to an embodiment of the present invention;

[0021] Figure 2 A schematic structural diagram of a pressure protection mechanism in a pressure protection device for hydraulic equipment according to an embodiment of the present invention;

[0022] Figure 3 A schematic cross-sectional view of a pressure protection mechanism in a pressure protection device for hydraulic equipment according to an embodiment of the present invention;

[0023] Figure 4 for Figure 3 A magnified view of middle;

[0024] Figure 5 A schematic structural diagram of an adjusting rod unit in a pressure protection device for hydraulic equipment according to an embodiment of the present invention;

[0025] Figure 6 The figure is a schematic structural diagram of a heat exchange component in a pressure protection device for hydraulic equipment according to an embodiment of the present invention.

[0026] As shown in the figure: 1. Hydraulic pipeline; 2. Hydraulic source; 3. Hydraulic equipment; 4. Pressure protection mechanism; 41. Oil inlet assembly; 411. Oil inlet check valve; 412. Oil inlet pressure valve; 413. Oil inlet pipe; 42. Pressure limiting discharge valve; 43. Pressure regulating assembly; 431. Buffer cylinder; 432. Piston; 433. Adjusting rod unit; 4331. Sliding rod; 4332. Threaded rod; 4333. Driving unit; 434. Threaded sleeve; 435. Guide sliding rod; 436. Buffer spring; 437. Sliding sleeve; 438. Bearing; 44. Storage tank assembly; 441. Storage tank; 442. Filter element groove; 443. Filter element; 45. Oil outlet assembly; 451. Oil outlet check valve; 452. Oil outlet pipe; 46. Heat exchange assembly; 461. Heat exchange fins; 462. Heat exchange tube. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limitations of the present invention. On the contrary, embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0028] The pressure protection device for hydraulic equipment according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0029] like Figure 1 and Figure 2 As shown, the pressure protection device for hydraulic equipment provided by the embodiment of the present invention includes a pressure protection mechanism 4 connected in parallel to the hydraulic pipeline 1, and the pressure protection mechanism 4 is used to protect the hydraulic oil in the hydraulic pipeline 1 from high pressure and unstable pressure.

[0030] The pressure protection mechanism 4 includes an oil inlet assembly 41, an oil outlet assembly 45, and a storage tank assembly 44 arranged between the oil inlet assembly 41 and the oil outlet assembly 45. The oil inlet end of the oil inlet assembly 41 is connected to the hydraulic pipeline 1, and the oil outlet end of the oil outlet assembly 45 is connected to the hydraulic pipeline 1.

[0031] The storage tank assembly 44 is used to stabilize the pressure of the hydraulic oil. The storage tank assembly 44 includes a storage tank 441 that can undergo pressure deformation. Both ends of the storage tank 441 are respectively connected to the oil inlet assembly 41 and the oil outlet assembly 45.

[0032] Specifically, when using the pressure protection device of the present invention, the oil inlet end of the oil inlet assembly 41 is first connected to the hydraulic pipeline 1, and the oil outlet end of the oil outlet assembly 45 is connected to the hydraulic pipeline 1. The hydraulic pipeline 1 promotes the flow of hydraulic oil through the hydraulic source 2 and generates pressure to drive the hydraulic oil in and out of the hydraulic using equipment 3.

[0033] When the hydraulic oil pressure in the hydraulic pipeline 1 suddenly rises sharply, the hydraulic oil will be squeezed into the pressure-deformable storage tank 441 along with the oil inlet assembly 41, and the volume of the storage tank 441 will increase to store the hydraulic oil, and the pressure in the hydraulic pipeline 1 will be released. When the pressure in the hydraulic pipeline 1 is too low, the hydraulic oil in the storage tank 441 will be squeezed into the hydraulic pipeline 1 to supplement the pressure, and the volume in the storage tank 441 will decrease.

[0034] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, the oil inlet assembly 41 includes an oil inlet pipe 413, an oil inlet check valve 411 and an oil inlet pressure valve 412, wherein the two ends of the oil inlet pipe 413 are respectively connected to the hydraulic pipeline 1 and the storage tank assembly 44, the oil inlet pressure valve 412 is arranged at the oil inlet end of the oil inlet pipe 413, and the oil inlet check valve 411 is arranged at the oil outlet end of the oil inlet pipe 413; the oil outlet assembly 45 includes an oil outlet pipe 452 and an oil outlet check valve 451, wherein the oil outlet pipe 452 is arranged between the storage tank assembly 44 and the hydraulic pipeline 1, and the oil outlet check valve 451 is arranged between the storage tank assembly 44 and the hydraulic pipeline 1.

[0035] Specifically, in the process of the hydraulic oil in the hydraulic pipeline 1 entering and exiting the storage tank 441, when the hydraulic oil pressure in the hydraulic pipeline 1 is too high and exceeds the pressure value of the oil inlet pressure valve 412, the oil inlet pressure valve 412 opens, and the hydraulic oil enters the storage tank 441 along the oil inlet check valve 411; when the hydraulic oil pressure in the hydraulic pipeline 1 is too low and lower than the hydraulic oil pressure value inside the storage tank 441, the hydraulic oil inside the storage tank 441 enters the hydraulic pipeline 1 along the oil outlet check valve 451 to supplement the pressure.

[0036] In one embodiment of the present invention, Figure 3-5 As shown, a pressure regulating assembly 43 is provided on the storage tank 441, wherein the pressure regulating assembly 43 includes a buffer cylinder 431, a piston 432 and an adjusting rod unit 433, wherein the buffer cylinder 431 is provided on the storage tank 441, the piston 432 is provided in the buffer cylinder 431, the adjusting rod unit 433 is connected to the piston 432, and the adjusting rod unit 433 is used to adjust the position of the piston 432.

[0037] The adjusting rod unit 433 includes a sliding rod 4331 and a threaded rod 4332 connected in one piece. The threaded rod 4332 is provided with a threaded sleeve 434 on the outside of the threaded rod 4332. A vertical guide sliding rod 435 is provided on the outside of the threaded sleeve 434. The guide sliding rod 435 vertically penetrates the buffer cylinder 431. A sliding sleeve 437 is provided on the outside of the sliding rod 4331. A buffer spring 436 is provided between the sliding sleeve 437 and the threaded sleeve 434. Bearings 438 are provided at both ends of the buffer spring 436 to prevent the buffer spring 436 from twisting. The diameter of the threaded rod 4332 is smaller than the diameter of the sliding rod 4331 to prevent the threaded sleeve 434 from slipping off.

[0038] Specifically, during the process of hydraulic oil entering and exiting the storage tank 441 , the hydraulic oil pushes the piston 432 to move up and down. The piston 432 has space to move up and down due to the elastic force of the buffer spring 436 , which is used to store the hydraulic oil and realize the pressure deformation of the storage tank 441 .

[0039] When it is necessary to adjust the entry pressure value of the storage tank 441, the driving part 4333 is connected to the top of the adjusting rod unit 433 to drive the adjusting rod unit 433 to rotate. The rotation of the adjusting rod unit 433 drives the threaded rod 4332 to rotate, and the buffer spring 436 is compressed upward. At the same time, the buffer spring 436 drives the piston 432 downward to apply force to the hydraulic oil, so as to adjust the initial average pressure value of the hydraulic pipeline 1.

[0040] It should be noted that in order to achieve pressure protection in the hydraulic pipeline 1, the opening pressure of the oil inlet pressure valve 412 needs to be equal to the upper limit of the safety pressure of the hydraulic pipeline 1, and the pressure of the oil inlet pipe 413 should be greater than or equal to the opening pressure of the oil inlet pressure valve 412 when the piston 432 moves.

[0041] The function of the oil inlet pressure valve 412 is to prevent oil leakage caused by leakage of the pressure protection mechanism 4 and to prevent leakage of the hydraulic oil in the hydraulic pipeline 1 .

[0042] In one embodiment of the present invention, Figure 3 As shown, a filter element groove 442 is opened inside the storage tank 441, and a detachable filter element 443 is arranged inside the filter element groove 442. Due to the effect of limiting the flow direction of the oil inlet check valve 411 and the oil outlet check valve 451, the hydraulic oil always flows from right to left in the storage tank 441, and the residue in the hydraulic oil is filtered through the filter element 443, thereby reducing the blockage of the oil circuit and reducing the wear of the hydraulic equipment.

[0043] In one embodiment of the present invention, Figure 6 As shown, a heat exchange component 46 is provided between the oil outlet check valve 451 and the hydraulic pipeline 1. The heat exchange component 46 includes heat exchange fins 461 and heat exchange tubes 462. The heat exchange tubes 462 are made of a high thermal conductivity metal material. The heat exchange fins 461 and the heat exchange tubes 462 are in contact with each other.

[0044] Specifically, due to the fluctuation of hydraulic oil pressure, the hydraulic oil is prompted to enter the storage tank 441 from the oil inlet pipe 413 and be discharged from the oil outlet pipe 452 to the hydraulic pipeline 1. During the flow of the hydraulic oil in the oil outlet pipe 452, the hydraulic oil transfers the heat to the heat exchange pipe 462 and the heat exchange fin 461 in sequence through the heat exchange pipe 462, so that the heat of the hydraulic oil is released, preventing the hydraulic oil temperature from being too high and causing the hydraulic oil pressure to be too high, and playing the role of cooling the entire oil circuit equipment to prevent equipment damage.

[0045] In one embodiment of the present invention, Figure 2 As shown, a pressure-limiting discharge valve 42 is provided between the oil inlet check valve 411 and the oil inlet pressure valve 412. When the pressure protection mechanism 4 is blocked, the excessive pressure will successively open the oil inlet pressure valve 412 and the pressure-limiting discharge valve 42 to discharge the hydraulic oil and protect the pressure balance inside the hydraulic oil circuit.

[0046] In order to clearly explain the above embodiments, refer to Figure 1-6 The specific working principle of the pressure protection device for hydraulic equipment of the present invention is as follows: When using the pressure protection device of the present invention, firstly, the oil inlet end of the oil inlet pipe 413 is connected to the hydraulic pipeline 1, and the oil outlet end of the oil outlet pipe 452 is connected to the hydraulic pipeline 1, such as Figure 1 , so that the pressure protection mechanism 4 is connected in parallel to the hydraulic pipeline 1, the hydraulic pipeline 1 pushes the hydraulic oil to flow through the hydraulic source 2, and generates pressure to drive the hydraulic oil in and out of the hydraulic using equipment 3.

[0047] When the hydraulic oil pressure inside the hydraulic pipeline 1 suddenly rises sharply, the hydraulic oil pressure in the hydraulic pipeline 1 is too high and exceeds the pressure value of the oil inlet pressure valve 412. The oil inlet pressure valve 412 opens, and the hydraulic oil enters the storage tank 441 along the oil inlet check valve 411. In the process of the hydraulic oil entering and exiting the storage tank 441, the hydraulic oil pushes the piston 432 to move upward. The piston 432 has space to move up and down due to the elastic force of the buffer spring 436. The buffer cylinder 431 on the lower side of the piston 432 is used to store hydraulic oil, thereby realizing the pressure deformation of the storage tank 441, and the excessive oil pressure in the hydraulic pipeline 1 is released.

[0048] When the hydraulic oil pressure in the hydraulic pipeline 1 is too low, lower than the hydraulic oil pressure value inside the storage tank 441, the buffer spring 436 pushes the piston 432 to move downward, and the piston 432 is pushed by the elastic force of the buffer spring 436 to flow out of the storage tank 441. The hydraulic oil inside the storage tank 441 enters the hydraulic pipeline 1 along the oil outlet one-way valve 451 to supplement the pressure.

[0049] When it is necessary to adjust the inlet pressure value of the storage tank 441 (i.e., the initial average pressure value of the hydraulic pipeline 1), the top of the adjusting rod unit 433 is connected to the driving part 4333 to drive the adjusting rod unit 433 to rotate, and the rotation of the adjusting rod unit 433 drives the threaded rod 4332 to rotate, and the buffer spring 436 is compressed upward. At the same time, the buffer spring 436 drives the piston 432 to exert force on the hydraulic oil downward, thereby adjusting the initial average pressure value of the hydraulic pipeline 1. Therefore, the buffer spring 436 can provide the piston 432 with an up and down buffer stroke, and adjust the initial pressure value of the piston 432.

[0050] Due to the flow restriction of the oil inlet check valve 411 and the oil outlet check valve 451, the hydraulic oil always flows from right to left in the storage tank 441, and the residue in the hydraulic oil is filtered by the filter element 443, thereby reducing the blockage of the oil circuit and the wear of the hydraulic equipment. At the same time, when the hydraulic oil flows out of the oil outlet pipe 452, the hydraulic oil passes through the heat exchange pipe 462 to transfer the heat to the heat exchange pipe 462 and the heat exchange fin 461 in sequence, so that the heat of the hydraulic oil is released, preventing the hydraulic oil temperature from being too high and causing the hydraulic oil pressure to be too high, and playing the role of cooling the entire oil circuit equipment to prevent equipment damage.

[0051] When the pressure protection mechanism 4 is blocked, the excessive pressure will open the oil inlet pressure valve 412 and the pressure-limiting discharge valve 42 in succession to discharge the hydraulic oil and protect the pressure balance inside the hydraulic oil circuit.

[0052] In summary, the pressure protection device for hydraulic equipment in the embodiment of the present invention is connected in parallel with the hydraulic pipeline through a pressure deformation storage tank assembly. When the internal pressure of the hydraulic pipeline changes, the hydraulic oil in the storage tank assembly enters and exits the hydraulic pipeline, preventing the hydraulic oil in the hydraulic pipeline from being high or unstable, reducing the load on the hydraulic equipment, and preventing leakage. At the same time, the initial value of the oil pressure in the hydraulic pipeline can be adjusted through the pressure regulating assembly, and the hydraulic oil can also be dissipated and filtered to make the hydraulic oil pressure more stable.

[0053] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and deform the above embodiments within the scope of the present invention.

Claims

1. A pressure protection device for hydraulic equipment, characterized in that: It comprises a pressure protection mechanism (4) connected in parallel to the hydraulic pipeline (1), wherein the pressure protection mechanism (4) is used to protect the hydraulic oil in the hydraulic pipeline (1) from high pressure and unstable pressure; The pressure protection mechanism (4) comprises an oil inlet assembly (41), an oil outlet assembly (45), and a storage tank assembly (44) arranged between the oil inlet assembly (41) and the oil outlet assembly (45), the oil inlet end of the oil inlet assembly (41) being connected to the hydraulic pipeline (1), and the oil outlet end of the oil outlet assembly (45) being connected to the hydraulic pipeline (1); The storage tank assembly (44) is used to stabilize the pressure of the hydraulic oil, and the storage tank assembly (44) comprises a storage tank (441) that can undergo pressure deformation, and two ends of the storage tank (441) are respectively connected to the oil inlet assembly (41) and the oil outlet assembly (45); The storage tank (441) is provided with a pressure regulating assembly (43), wherein the pressure regulating assembly (43) comprises a buffer cylinder (431), a piston (432) and an regulating rod unit (433), wherein the buffer cylinder (431) is provided on the storage tank (441), the piston (432) is provided in the buffer cylinder (431), the regulating rod unit (433) is connected to the piston (432), and the regulating rod unit (433) is used to adjust the position of the piston (432); The adjusting rod unit (433) comprises a sliding rod (4331) and a threaded rod (4332) connected in one piece, the threaded rod (4332) is provided with a threaded sleeve (434) on the outside of the threaded sleeve (434), a vertical guide sliding rod (435) is provided on the outside of the threaded sleeve (434), and the guide sliding rod (435) vertically penetrates the buffer cylinder (431); The sliding rod (4331) is externally sleeved with a sliding sleeve (437), a buffer spring (436) is provided between the sliding sleeve (437) and the threaded sleeve (434), and bearings (438) are respectively provided at both ends of the buffer spring (436); The diameter of the threaded rod (4332) is smaller than the diameter of the sliding rod (4331).

2. The pressure protection device for hydraulic equipment according to claim 1, characterized in that: The oil inlet assembly (41) comprises an oil inlet pipe (413), an oil inlet non-return valve (411) and an oil inlet pressure valve (412), wherein two ends of the oil inlet pipe (413) are respectively connected to the hydraulic pipeline (1) and the storage tank assembly (44), the oil inlet pressure valve (412) is arranged at the oil inlet end of the oil inlet pipe (413), and the oil inlet non-return valve (411) is arranged at the oil outlet end of the oil inlet pipe (413).

3. The pressure protection device for hydraulic equipment according to claim 2, characterized in that: The oil outlet assembly (45) comprises an oil outlet pipe (452) and an oil outlet one-way valve (451), wherein the oil outlet pipe (452) is arranged between the storage tank assembly (44) and the hydraulic pipeline (1), and the oil outlet one-way valve (451) is arranged between the storage tank assembly (44) and the hydraulic pipeline (1).

4. The pressure protection device for hydraulic equipment according to claim 1, characterized in that: A filter element groove (442) is provided inside the storage tank (441), and a detachable filter element (443) is provided inside the filter element groove (442).

5. The pressure protection device for hydraulic equipment according to claim 3, characterized in that: A heat exchange component (46) is provided between the oil outlet one-way valve (451) and the hydraulic pipeline (1); the heat exchange component (46) comprises a heat exchange fin (461) and a heat exchange tube (462); the heat exchange tube (462) is made of a high thermal conductivity metal material; the heat exchange fin (461) and the heat exchange tube (462) are in contact with each other.

6. The pressure protection device for hydraulic equipment according to claim 2, characterized in that: A limited pressure discharge valve (42) is provided between the oil inlet check valve (411) and the oil inlet pressure valve (412).

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