Piston rod end shaft seal leakage prevention device and hydraulic power system

Abstract

The utility model belongs to sealing technical field discloses a piston rod end shaft seal leak protection device and hydraulic power system. The device includes shaft seal cover plate and sealing element, and the shaft seal cover plate is connected to the lower end surface of the mounting support of hydraulic drive element, the shaft seal cover plate has first through -hole, the mounting support has second through -hole, the vertical piston rod of hydraulic drive element is arranged in first through -hole and second through -hole, and is connected with the valve below the shaft seal cover plate, and the connecting surface between the shaft seal cover plate and the mounting support, the side wall between through -hole and vertical piston rod are all sealed and are provided with sealing element. Through above -mentioned setting, on one hand can hinder oil from the clearance between the connecting surface of shaft seal cover plate and mounting support, on the other hand can hinder oil from the clearance between the inner side wall of first through -hole and the outer side wall of vertical piston rod, thereby reduce the risk of oil leakage, avoid the fire caused by the oil flow to the high temperature area of mounting support bottom, improve the safety and stability when the hydraulic drive element operates.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a piston rod end shaft seal anti-leakage device and a hydraulic power system. Background Technology

[0002] Currently, for high-temperature and high-pressure valves in thermal systems that are vertically installed and driven by hydraulic cylinders, a sealing ring is usually installed at the connection between the hydraulic cylinder and the piston rod as an oil seal structure to improve the sealing safety of the hydraulic cylinder.

[0003] However, this method often has the following problem: once the piston rod oil seal leaks, oil inevitably leaks down the piston rod onto the high-temperature, high-pressure valve body. Since the valve body temperature exceeds the flash point of the hydraulic oil, a serious fire may occur.

[0004] Therefore, there is an urgent need for a piston rod end shaft seal anti-leakage device and a hydraulic power system to solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of this invention is to provide a piston rod end shaft seal anti-leakage device and a hydraulic power system, which can reduce the risk of oil leakage, avoid fire accidents, and improve safety.

[0006] A piston rod end shaft seal anti-leakage device includes: a shaft seal cover plate and a sealing element. The shaft seal cover plate is fitted and connected to the lower end face of the mounting bracket of the hydraulic drive component. The shaft seal cover plate has a first through hole, and the mounting bracket has a second through hole. The vertical piston rod of the hydraulic drive component passes through the first through hole and the second through hole and is connected to a valve located below the shaft seal cover plate. The sealing element is sealed between the connecting surface of the shaft seal cover plate and the mounting bracket, and between the through hole and the side wall of the vertical piston rod.

[0007] Preferably, the shaft seal cover includes a base plate and a protrusion. The first through hole is simultaneously disposed through the base plate and the protrusion. The base plate is attached to the lower end face of the mounting bracket. The protrusion is inserted into the second through hole. The sealing element is sealed between the outer wall surface of the protrusion and the inner wall surface of the second through hole.

[0008] Preferably, the outer peripheral surface of the protrusion is provided with a first fitting groove, which is used to place the sealing element.

[0009] Preferably, the sealing element includes a first sealing ring, which is an O-ring, and the O-ring is placed in the first mounting groove.

[0010] Preferably, the inner wall of the first through hole is provided with a second fitting groove, which is used to place the sealing element.

[0011] Preferably, the seal includes a second sealing ring, which is a U-shaped ring placed in the second mounting groove.

[0012] Preferably, the shaft seal cover has an oil guide channel, one end of which is connected to the second through hole, and the other end of which is connected to the outside of the shaft seal cover.

[0013] Preferably, the oil guiding channel includes a first oil guiding section and a second oil guiding section. One end of the first oil guiding section is connected to the second through hole, and the other end of the first oil guiding section is connected to one end of the second oil guiding section. The other end of the second oil guiding section is connected to the outside of the shaft seal cover plate, and the flow channel cross-sectional area of ​​the second oil guiding section is larger than that of the first oil guiding section.

[0014] Preferably, the mounting bracket also includes a threaded fastener; the lower end face of the mounting bracket is provided with a threaded mounting hole, the shaft seal cover is provided with a third through hole, the third through hole is coaxially arranged with the threaded mounting hole, the threaded fastener passes through the third through hole and is threadedly connected to the corresponding threaded mounting hole.

[0015] The hydraulic power system includes a valve, a hydraulic drive component, and the aforementioned piston rod end shaft seal anti-leakage device. The piston rod end shaft seal anti-leakage device is sealed and installed on the mounting bracket of the hydraulic drive component. The vertical piston rod of the hydraulic drive component passes through the mounting bracket and the piston rod end shaft seal anti-leakage device and is connected to the valve.

[0016] The beneficial effects of this utility model are:

[0017] The piston rod end shaft seal anti-leakage device provided by this utility model can, on the one hand, prevent oil from flowing out from the gap between the shaft seal cover plate and the mounting bracket, and on the other hand, prevent oil from flowing out from the gap between the inner side wall of the first through hole and the outer side wall of the vertical piston rod, thereby reducing the risk of oil leakage, preventing oil from flowing to the high-temperature area at the bottom of the mounting bracket and causing a fire, and improving the safety and stability of the hydraulic drive components during operation.

[0018] The hydraulic power system provided by this utility model, by setting the aforementioned piston rod end shaft seal anti-leakage device, can achieve the purpose of sealing and preventing oil leakage, thereby reducing the risk of oil leakage, avoiding fire accidents, and improving system safety. Attached Figure Description

[0019] Figure 1This is an assembly diagram of the piston rod end shaft seal anti-leakage device provided in this embodiment of the utility model;

[0020] Figure 2 This is a cross-sectional view of the shaft seal cover plate provided in this embodiment of the utility model;

[0021] Figure 3 This is a three-dimensional structural diagram of the shaft seal cover plate provided in this embodiment of the utility model.

[0022] In the picture:

[0023] 10. Piston rod end shaft seal anti-leakage device; 11. Shaft seal cover plate; 1101. First through hole; 1102. Second fitting groove; 1103. Oil guide channel; 11031. First oil guide section; 11032. Second oil guide section; 1104. Third through hole; 111. Base plate; 112. Protrusion; 1121. First fitting groove; 12. Seal; 121. First sealing ring; 122. Second sealing ring;

[0024] 21. Mounting bracket; 2101. Second through hole; 22. Vertical piston rod; 23. Hydraulic cylinder. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0029] The technical solution provided by this utility model will be described below with reference to the accompanying drawings and specific embodiments.

[0030] Combination Figures 1 to 3 As shown, this embodiment provides a piston rod end shaft seal anti-leakage device 10, including a shaft seal cover plate 11 and a seal 12. The shaft seal cover plate 11 is fitted and connected to the lower end face of the mounting bracket 21 of the hydraulic drive component. The shaft seal cover plate 11 has a first through hole 1101, and the mounting bracket 21 has a second through hole 2101. The vertical piston rod 22 of the hydraulic drive component passes through the first through hole 1101 and the second through hole 2101, and is connected to a valve (not shown in the figure) located below the shaft seal cover plate 11. The seal 12 is sealed between the connecting surface of the shaft seal cover plate 11 and the mounting bracket 21, and between the first through hole 1101 and the side wall of the vertical piston rod 22.

[0031] Specifically, refer to Figure 1As shown, when a leak occurs at the connection between the hydraulic cylinder 23 and the vertical piston rod 22 (refer to reference number A in the figure), the oil will flow downwards along the vertical piston rod 22. By providing a seal 12, on the one hand, the oil can be prevented from flowing out from the gap between the shaft seal cover plate 11 and the mounting bracket 21; on the other hand, the oil can be prevented from flowing out from the gap between the inner wall of the first through hole 1101 and the outer wall of the vertical piston rod 22, thereby reducing the risk of oil leakage and preventing oil from flowing to the high-temperature area at the bottom of the mounting bracket 21 and causing a fire, thus improving the safety and stability of the hydraulic drive component during operation. Furthermore, by providing a shaft seal cover plate 11 on the mounting bracket 21, the shaft seal cover plate 11 can absorb the heat radiation from the bottom of the mounting bracket 21, preventing heat radiation from being projected onto the shaft seal at the connection between the hydraulic cylinder 23 and the vertical piston rod 22 through the second through hole 2101, thus preventing the shaft seal from aging and fundamentally reducing the risk of oil leakage.

[0032] In this embodiment, reference Figure 1 , Figure 2 As shown, the shaft seal cover 11 includes a base plate 111 and a protrusion 112. The base plate 111 and the protrusion 112 are preferably fixedly connected by integral molding, which helps to save processing time, improve the manufacturing efficiency and precision of the shaft seal cover 11, and allow the shaft seal cover 11 to be adjusted in terms of shape and other aspects according to actual working conditions, resulting in high-quality finished products. A first through hole 1101 is simultaneously disposed through the base plate 111 and the protrusion 112. The base plate 111 is attached to the lower end face of the mounting bracket 21, and the protrusion 112 is inserted into the second through hole 2101. A sealing element 12 is provided between the outer wall of the protrusion 112 and the inner wall of the second through hole 2101.

[0033] By inserting the protrusion 112 into the second through hole 2101, the shaft seal cover plate 11 can be positioned and assembled with the mounting bracket 21 through the protrusion 112, ensuring the concentricity of the first through hole 1101 and the second through hole 2101. Then, the sealing element 12 on the outer peripheral surface of the protrusion 112 fills the gap between the protrusion 112 and the inner wall of the second through hole 2101, ultimately achieving a sealing effect and preventing oil leakage. In addition, compared with setting the sealing element 12 between the base plate 111 and the lower end face of the mounting bracket 21, the advantages are: since the contact area between the base plate 111 and the mounting bracket 21 is large, if there is unevenness in the plane during assembly, it is easy to cause excessive local gaps, which will destroy the sealing effect. However, the outer peripheral surface seal of the protrusion 112 is a circumferential seal, and the sealing element 12 is constrained within the hole-shaft gap, which is less affected by the flatness of the plane and the tightening force, thus achieving a more stable sealing effect.

[0034] In this embodiment, the seal 12 includes a first sealing ring 121, which is an O-ring. The O-ring is arranged around the outer peripheral surface of the protrusion 112 to ensure that the gap between the outer periphery of the protrusion 112 and the inner wall of the second through hole 2101 can be completely filled, avoiding local sealing failure and further reducing the possibility of oil leakage. Moreover, its elastic properties can automatically compensate for minor dimensional deviations between the protrusion 112 and the second through hole 2101, or gap changes caused by assembly or vibration, without the need for additional adjustments. Its adaptability is higher than other non-annular seals 12. In addition, the O-ring has a simple structure and a high degree of standardization, which can effectively control procurement costs. During maintenance, it is only necessary to remove the shaft seal cover plate 11 and remove the old O-ring from the outer periphery of the protrusion 112 to replace it with a new one. The operation steps are few and the time consumption is short. There is no need to clean or repair the mating surface of the substrate 111 or the mounting bracket 21, which significantly improves maintenance efficiency.

[0035] O-rings can be any of the following: nitrile rubber, fluororubber, silicone rubber, and EPDM rubber. Preferably, nitrile rubber is used, which typically has a working temperature range of -40℃ to 120℃, good wear resistance and elasticity, and a high cost-performance ratio, making it suitable for applications involving contact with oils (such as hydraulic oil).

[0036] In this embodiment, a first fitting groove 1121 is provided circumferentially on the outer periphery of the protrusion 112, and the first fitting groove 1121 is used to place the aforementioned O-ring. Specifically, refer to... Figure 2 As shown, the dimensions (width and depth) of the first mounting groove 1121 match the cross-sectional dimensions of the O-ring, thereby firmly constraining the O-ring within the first mounting groove 1121. This prevents the O-ring from deviating from its sealing position due to friction or compression during assembly, or from shifting due to vibration or oil impact during equipment operation, ensuring that the sealing surface is always in close contact with the inner wall of the second through hole 2101.

[0037] It should be noted that the depth of the first mounting groove 1121 can be precisely designed according to the diameter of the O-ring. For example, the depth of the first mounting groove 1121 is usually slightly less than half the cross-sectional diameter of the O-ring, so that when the O-ring is squeezed by the inner wall of the second through hole 2101 after assembly, the compression can be kept within the optimal range. This avoids sealing gaps caused by insufficient compression and also prevents permanent deformation or accelerated aging of the O-ring caused by excessive compression, thus extending its service life while ensuring sealing reliability.

[0038] In this embodiment, the seal 12 further includes a second sealing ring 122. The second sealing ring 122 is a U-shaped ring, which is sandwiched between the first through hole 1101 and the side wall of the vertical piston rod 22. Since the cross-section of the U-shaped ring is U-shaped, a relatively rigid support edge is usually formed on the non-open side. The support edge can provide radial support for the open side of the U-shaped ring. When the vertical piston rod 22 reciprocates, the support edge can limit the excessive deformation of the open side, preventing it from being dragged and folded under the action of friction. This makes the force direction of the open side more stable when the vertical piston rod 22 moves, and it is less likely to curl due to shear force.

[0039] Preferably, the U-ring is made of fabric-reinforced rubber or reinforced elastic material, which makes the wear resistance of the opening side better than that of ordinary seal 12, and has stronger support and toughness, reducing the probability of being pushed and curled in dynamic scenarios, and making it more stable in use.

[0040] Specifically, refer to Figure 2 As shown, in this embodiment, a second fitting groove 1102 is annularly provided on the inner wall of the first through hole 1101. The second fitting groove 1102 is used to place the U-ring. The dimensions (depth and width) of the second fitting groove 1102 match the cross-sectional dimensions of the U-ring, which can stably constrain the U-ring within the second fitting groove 1102. This not only avoids obstructing the assembly of the vertical piston rod 22 and the shaft seal cover plate 11, but also ensures that the outer wall of the vertical piston rod 22 can fit snugly against the inner wall of the first through hole 1101, guaranteeing the coaxiality of the vertical piston rod 22 and the first through hole 1101. It also prevents the U-ring from deviating from the sealing position due to friction and compression during assembly, or from shifting due to vibration and oil impact during equipment operation, ensuring that the outer wall of the vertical piston rod 22 is always tightly fitted against the inner wall of the first through hole 1101.

[0041] In this embodiment, the shaft seal cover plate 11 also has an oil guide channel 1103. One end of the oil guide channel 1103 is connected to the second through hole 2101, and the other end of the oil guide channel 1103 is connected to the outside of the shaft seal cover plate 11. Specifically, refer to Figure 2 As shown, the oil guiding channel 1103 is formed in the protrusion 112 and the substrate 111. One end of the oil guiding channel 1103 is connected to the second through hole 2101 through the protrusion 112, and the other end is connected to the external environment through the substrate 111. This allows the oil in the oil accumulation cavity to flow to a safe area under the guidance of the oil guiding channel 1103, thereby draining the oil in the oil accumulation cavity, avoiding oil accumulation, reducing the oil pressure of the seal 12, preventing the seal 12 from being soaked and aged by oil, or leaking due to the oil pressure exceeding the critical value, thereby protecting the sealing performance and service life of the seal 12.

[0042] For example, when a small leak occurs at the connection between the hydraulic cylinder 23 and the vertical piston rod 22, the oil will concentrate in the oil accumulation chamber and slowly flow through the oil guide channel 1103 to a safe area, making it easy to observe whether the equipment needs maintenance; when a large leak occurs at the connection between the hydraulic cylinder 23 and the vertical piston rod 22, the flow direction of the oil can be effectively guaranteed to avoid fire accidents.

[0043] In this embodiment, the oil guiding channel 1103 includes a first oil guiding section 11031 and a second oil guiding section 11032. One end of the first oil guiding section 11031 is connected to the second through hole 2101, and the other end of the first oil guiding section 11031 is connected to one end of the second oil guiding section 11032. The other end of the second oil guiding section 11032 is connected to the outside of the shaft seal cover plate 11, and the flow channel cross-sectional area of ​​the second oil guiding section 11032 is larger than that of the first oil guiding section 11031.

[0044] Specifically, refer to Figure 2 As shown, by setting the second oil guide section 11032, the radial opening of the oil guide channel 1103 can be matched with the diameter of the external guide pipe, thereby facilitating the insertion of the guide pipe into the second oil guide section 11032 to guide the oil to a safe area and prevent the oil from flowing to the high-temperature area at the bottom of the mounting bracket 21 and causing a fire. Moreover, it can also make the connection between the guide pipe and the oil guide channel 1103 tighter, so that the gap between the guide pipe and the oil guide channel 1103 is formed between the pipe wall and the inner wall of the channel, rather than between the pipe opening and the opening, making it more difficult for the oil to leak from between the guide pipe and the oil guide channel 1103.

[0045] Preferably, in this embodiment, the cross-sectional shape of the first oil guide section 11031 is L-shaped. One end of the first oil guide section 11031 is vertically connected to the oil accumulation chamber, and the other end of the first oil guide section 11031 is horizontally connected to one end of the second oil guide section 11032 after a 90° turn. The other end of the second oil guide section 11032 has an opening on the side wall of the substrate 111, so that the guide tube can be horizontally inserted into the second oil guide section 11032, saving assembly space and making the connection more convenient.

[0046] In this embodiment, the leak-proof device also includes a threaded fastener; the lower end face of the mounting bracket 21 is provided with a threaded mounting hole, and the shaft seal cover plate 11 is provided with a third through hole 1104. The third through hole 1104 can be coaxially arranged with the threaded mounting hole, and the threaded fastener passes through the third through hole 1104 and is threadedly connected to the corresponding threaded mounting hole.

[0047] Specifically, refer to Figure 3As shown, in this embodiment, threaded mounting holes are circumferentially formed on the lower end face of the mounting bracket 21. Multiple third through holes 1104 are circumferentially formed on the substrate 111. The number of third through holes 1104 is the same as the number of threaded mounting holes. When the protrusion 112 is inserted into the second through hole 2101 and the top surface of the substrate 111 is attached to the lower end face of the mounting bracket 21, the third through holes 1104 and threaded mounting holes are set one-to-one. Then, the shaft seal cover plate 11 and the mounting bracket 21 are threadedly connected by threaded fasteners (such as bolts and screws) to complete the relative fixed connection between the shaft seal cover plate 11 and the mounting bracket 21. The structure is simple, safe and reliable, and easy to disassemble and assemble.

[0048] This embodiment also provides a hydraulic power system, including a valve, a hydraulic drive component, and the piston rod end shaft seal anti-leakage device 10 mentioned above. The piston rod end shaft seal anti-leakage device 10 is sealed and installed on the mounting bracket 21 of the hydraulic drive component. The vertical piston rod 22 of the hydraulic drive component passes through the mounting bracket 21 and the piston rod end shaft seal anti-leakage device 10, and is connected to the valve.

[0049] Specifically, the hydraulic drive provided in this embodiment is a hydraulic actuator. The mounting bracket 21 of the hydraulic actuator, along with the piston rod end shaft seal anti-leakage device 10, seals and prevents oil leakage, thereby reducing the risk of oil leakage, preventing fires, and improving system safety. Of course, in other parallel embodiments, this piston rod end shaft seal anti-leakage device 10 can also be applied to valve piston rods that are vertically installed in similar thermal systems and use hydraulic drives as the driving force; this invention is not limited to this application.

[0050] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A piston rod end shaft seal leak-proof device, characterized in that, include: A shaft seal cover (11) and a seal (12) are provided. The shaft seal cover (11) is fitted to the lower end face of the mounting bracket (21) of the hydraulic drive component. The shaft seal cover (11) has a first through hole (1101), and the mounting bracket (21) has a second through hole (2101). The vertical piston rod (22) of the hydraulic drive component passes through the first through hole (1101) and the second through hole (2101) and is connected to a valve located below the shaft seal cover (11). The seal (12) is sealed between the connecting surface of the shaft seal cover (11) and the mounting bracket (21) and between the through hole and the side wall of the vertical piston rod (22).

2. The piston rod end shaft seal leak-proof device according to claim 1, characterized in that, The shaft seal cover plate (11) includes a base plate (111) and a protrusion (112). The first through hole (1101) is simultaneously disposed through the base plate (111) and the protrusion (112). The base plate (111) is attached to the lower end face of the mounting bracket (21). The protrusion (112) is inserted into the second through hole (2101). The sealing element (12) is sealed between the outer wall surface of the protrusion (112) and the inner wall surface of the second through hole (2101).

3. The piston rod end shaft seal leak-proof device according to claim 2, characterized in that, The outer circumferential surface of the protrusion (112) is provided with a first fitting groove (1121), which is used to place the sealing element (12).

4. The piston rod end shaft seal leak-proof device according to claim 3, characterized in that, The sealing element (12) includes a first sealing ring (121), which is an O-ring and is placed in the first mounting groove (1121).

5. The piston rod end shaft seal leak-proof device according to claim 1, characterized in that, The inner wall of the first through hole (1101) is provided with a second fitting groove (1102) in an annular shape, and the second fitting groove (1102) is used to place the sealing element (12).

6. The piston rod end shaft seal leak-proof device according to claim 5, characterized in that, The sealing element (12) includes a second sealing ring (122), which is a U-shaped ring placed in the second mounting groove (1102).

7. The piston rod end shaft seal leak-proof device according to claim 1, characterized in that, The shaft seal cover (11) has an oil guide channel (1103) inside. One end of the oil guide channel (1103) is connected to the second through hole (2101), and the other end of the oil guide channel (1103) is connected to the outside of the shaft seal cover (11).

8. The piston rod end shaft seal leak-proof device according to claim 7, characterized in that, The oil guiding channel (1103) includes a first oil guiding section (11031) and a second oil guiding section (11032). One end of the first oil guiding section (11031) is connected to the second through hole (2101), and the other end of the first oil guiding section (11031) is connected to one end of the second oil guiding section (11032). The other end of the second oil guiding section (11032) is connected to the outside of the shaft seal cover plate (11), and the flow channel cross-sectional area of ​​the second oil guiding section (11032) is larger than the flow channel cross-sectional area of ​​the first oil guiding section (11031).

9. The piston rod end shaft seal leak-proof device according to claim 8, characterized in that, It also includes threaded fasteners; the lower end face of the mounting bracket (21) is provided with a threaded mounting hole, and the shaft seal cover plate (11) is provided with a third through hole (1104). The third through hole (1104) can be coaxially arranged with the threaded mounting hole. The threaded fastener passes through the third through hole (1104) and is threadedly connected to the corresponding threaded mounting hole.

10. A hydraulic power system, characterized in that, The device includes a valve, a hydraulic drive unit, and a piston rod end seal anti-leakage device (10) according to any one of claims 1-9. The piston rod end seal anti-leakage device (10) is sealed and installed on the mounting bracket (21) of the hydraulic drive unit. The vertical piston rod (22) of the hydraulic drive unit passes through the mounting bracket (21) and the piston rod end seal anti-leakage device (10) and is connected to the valve.

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