A leak-proof sealing device for a hydraulic cylinder
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI HENGXIANG FRICTION MATERIAL CO LTD
- Filing Date
- 2025-09-24
- Publication Date
- 2026-07-21
AI Technical Summary
Hydraulic cylinders are prone to oil leakage and poor sealing when the piston rod reciprocates.
It employs a piston sealing mechanism, a plug sealing mechanism, and an auxiliary sealing mechanism, including components such as a metal core ring, a main sealing ring, a fluororubber sealing ring, and a rubber scraper ring, to improve the sealing performance of the piston rod through a multi-layer sealing structure.
It effectively prevents hydraulic oil leakage, improves the sealing of the piston rod in the hydraulic cylinder, and ensures the stable operation of the hydraulic system.
Smart Images
Figure CN224533145U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of hydraulic cylinder technology, specifically a leak-proof sealing device for hydraulic cylinders. Background Technology
[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device and has no transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines.
[0003] When a hydraulic cylinder is in use, hydraulic oil is injected into it. The hydraulic oil acts on the piston, and due to the different areas at both ends of the piston, a pressure difference is generated, which pushes the piston to move towards the rod chamber or the rodless chamber, thus achieving linear reciprocating motion.
[0004] However, during the use of hydraulic cylinders, abnormal high pressure may be generated inside the cylinder when the piston rod reciprocates. Poor sealing of the hydraulic cylinder body can easily lead to oil leakage. Therefore, a leak-proof sealing device for hydraulic cylinder bodies is proposed to address the above problems. Utility Model Content
[0005] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model proposes a leak-proof sealing device for hydraulic cylinders.
[0006] The technical solution adopted by this utility model to solve its technical problem is: a leak-proof sealing device for a hydraulic cylinder, including a hydraulic cylinder barrel; an upper cylinder cover is fixedly installed above the hydraulic cylinder barrel, and a lower cylinder cover is fixedly installed below the hydraulic cylinder barrel. A sliding hole is opened on the upper cylinder cover, and a piston rod is slidably connected to the sliding hole. A piston support plate is fixedly installed at the bottom of the piston rod, and a piston sealing mechanism is provided on the piston support plate. A plugging hole sealing mechanism is provided on the inner side of the upper cylinder cover. The plugging hole sealing mechanism includes a support ring fixedly installed below the upper cylinder cover. A set of main sealing rings is fixedly installed on the inner side of the support ring. The main sealing rings are slidably connected to the piston rod, and a cavity is formed between the two main sealing rings and the piston rod. An external air pipe is fixedly installed on the hydraulic cylinder barrel, and the external air pipe is connected to the cavity. An auxiliary connecting plate is fixedly installed above the upper cylinder cover, and an auxiliary sealing mechanism is provided on the auxiliary connecting plate.
[0007] Preferably, the piston sealing mechanism includes a metal retainer ring fixedly disposed on the side of the piston support plate, and a set of piston sealing lips disposed on the outer side wall of the metal retainer ring, the outer side of the piston sealing lips being slidably connected to the inner wall of the hydraulic cylinder.
[0008] Preferably, the longitudinal section of the main sealing ring is T-shaped, and a polyurethane wear-resistant layer is provided on the inner side of the main sealing ring.
[0009] Preferably, the auxiliary sealing mechanism includes an embedded hole in the auxiliary connecting plate, a rigid ring fixedly disposed in the embedded hole, a fluoropolymer sealing ring fixedly disposed on the inner side wall of the rigid ring, and the inner side of the fluoropolymer sealing ring being slidably connected to the piston rod.
[0010] Preferably, a plurality of support columns are fixedly installed above the auxiliary connecting plate, and a ring frame is fixedly installed above the plurality of support columns. A rubber scraper ring is fixedly installed on the inner side wall of the ring frame, and the rubber scraper ring is slidably connected to the piston rod.
[0011] Preferably, a hydraulic interface is fixedly provided at the bottom of the lower cylinder head, and the hydraulic interface is provided with external threads.
[0012] The advantages of this utility model are: This utility model provides a leak-proof sealing device for a hydraulic cylinder. Through the structural design of the piston sealing mechanism, the sealing performance of the piston support plate during movement inside the hydraulic cylinder is improved, preventing hydraulic oil leakage.
[0013] This utility model provides a leak-proof sealing device for a hydraulic cylinder. Through the structural design of the plug-hole sealing mechanism, the piston rod moving on the upper cylinder head is sealed. A set of main sealing rings is fixedly installed on the inner side of the support ring. The main sealing rings are slidably connected to the piston rod, thereby improving the sealing performance of the piston rod movement.
[0014] This utility model provides a leak-proof sealing device for a hydraulic cylinder, which further improves the sealing performance of the upper part of the hydraulic cylinder when the piston rod moves by the structural design of the auxiliary sealing mechanism.
[0015] This utility model provides a leak-proof sealing device for a hydraulic cylinder. Multiple support pillars are fixedly installed above the auxiliary connecting plate, and a ring frame is fixedly installed above the multiple support pillars. A rubber scraper ring is fixedly installed on the inner side of the ring frame, which can clean the dust attached to the outer side of the piston rod. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1This is a perspective view of the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 This is a cross-sectional view of the present invention; Figure 4 yes Figure 3 Enlarged view of point B in the middle; Figure 5 yes Figure 3 Enlarged view of point C in the middle; Figure 6 This is a 3D view of the auxiliary sealing mechanism.
[0018] In the diagram: 1. Hydraulic cylinder barrel; 2. Upper cylinder head; 3. Lower cylinder head; 4. Piston rod; 5. Piston support plate; 6. Support ring; 7. Main sealing ring; 8. Cavity; 9. External air pipe; 10. Auxiliary connecting plate; 11. Metal bone ring; 12. Piston sealing lip; 13. Polyurethane wear-resistant layer; 14. Embedded hole; 15. Rigid ring; 16. Vulcanized fluororubber sealing ring; 17. Support column; 18. Ring frame; 19. Rubber scraper ring; 20. Hydraulic interface. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0020] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail. This application discloses a leak-proof sealing device for a hydraulic cylinder. (Refer to...) Figure 1 and Figure 6A leak-proof sealing device for a hydraulic cylinder includes a hydraulic cylinder barrel 1. The hydraulic cylinder barrel 1 is made of high-strength steel and has an anti-corrosion coating on its surface. An upper cylinder cover 2 is fixedly installed above the hydraulic cylinder barrel 1, and a lower cylinder cover 3 is fixedly installed below the hydraulic cylinder barrel 1. A sliding hole is provided on the upper cylinder cover 2, and a piston rod 4 is slidably connected to the sliding hole. A piston support plate 5 is fixedly installed at the bottom of the piston rod 4, and a piston sealing mechanism is provided on the piston support plate 5 to improve the sealing performance of the piston support plate 5 inside the hydraulic cylinder barrel 1. A plugging hole sealing mechanism is provided on the inner side of the upper cylinder cover 2 to seal the piston rod 4 that moves on the upper cylinder cover 2. The plugging hole sealing mechanism includes a support ring 6 fixedly installed below the upper cylinder cover 2. The support ring 6 is made of high-strength steel and has good rigidity. A set of main sealing rings 7 are fixedly installed on the inner side. The main sealing rings 7 are slidably connected to the piston rod body 4 to improve the sealing performance of the piston rod body 4 during movement. A cavity 8 is formed between the two main sealing rings 7 and the piston rod body 4. An external air pipe 9 is fixedly installed on the hydraulic cylinder 1. The external air pipe 9 is connected to the cavity 8. By connecting an external air source to the external air pipe 9 and inputting appropriate gas into the cavity 8 formed between the two main sealing rings 7 and the piston rod body 4, the air pressure in the cavity 8 is increased, thereby expanding the two main sealing rings 7 outward and making the main sealing rings 7 fit more tightly, thus improving the sealing performance between the main sealing rings 7 and the piston rod body 4. An auxiliary connecting plate 10 is fixedly installed above the upper cylinder head 2. An auxiliary sealing mechanism is installed on the auxiliary connecting plate 10. Through the structure of the auxiliary sealing mechanism, the sealing performance of the upper part of the hydraulic cylinder body is further improved when the piston rod body 4 moves.
[0021] Reference Figure 3 and Figure 4 The piston sealing mechanism includes a metal ring 11 fixedly disposed on the side of the piston support plate 5. A set of piston sealing lips 12 is disposed on the outer side wall of the metal ring 11. The outer side of the piston sealing lips 12 is slidably connected to the inner wall of the hydraulic cylinder 1. Through this structure, the sealing performance of the piston support plate 5 when moving inside the hydraulic cylinder 1 is improved, and hydraulic oil leakage is prevented.
[0022] Reference Figure 3 and Figure 4 The longitudinal section of the main sealing ring 7 is T-shaped, and a polyurethane wear-resistant layer 13 is provided on the inner side of the main sealing ring 7 to improve the wear resistance of the main sealing ring 7.
[0023] Reference Figure 1 and Figure 6The auxiliary sealing mechanism includes an embedded hole 14 in the auxiliary connecting plate 10, a rigid ring 15 fixedly installed in the embedded hole 14, and a fluoropolymer sealing ring 16 fixedly installed on the inner wall of the rigid ring 15. The inner side of the fluoropolymer sealing ring 16 is slidably connected to the piston rod 4. The rigid ring 15 supports the fluoropolymer sealing ring 16. The structure of the auxiliary sealing mechanism further improves the sealing performance of the upper part of the hydraulic cylinder when the piston rod 4 moves.
[0024] Reference Figure 6 Multiple support columns 17 are fixedly installed above the auxiliary connecting plate 10, and a ring frame 18 is fixedly installed above the multiple support columns 17. A rubber scraper ring 19 is fixedly installed on the inner side wall of the ring frame 18. The rubber scraper ring 19 is slidably connected to the piston rod body 4, which can clean the dust attached to the outside of the piston rod body 4.
[0025] Reference Figure 1 A hydraulic interface 20 is fixedly installed at the bottom of the lower cylinder head 3. The hydraulic interface 20 has an external thread for connecting an external hydraulic oil pipe. Hydraulic oil is injected into the hydraulic cylinder 1 through the hydraulic interface 20, thereby pushing the piston support plate 5 inside the hydraulic cylinder 1.
[0026] Working principle: The sealing performance of the piston support plate 5 inside the hydraulic cylinder 1 is improved by the structure of the piston sealing mechanism. The metal rib ring 11 is fixedly installed on the side of the piston support plate 5, and a set of piston sealing lips 12 is provided on the outer side of the metal rib ring 11. This structure improves the sealing performance of the piston support plate 5 when it moves inside the hydraulic cylinder 1, and prevents hydraulic oil from leaking out. Through the structural design of the plug sealing mechanism, the piston rod 4 moving on the upper cylinder head 2 is sealed. A set of main sealing rings 7 are fixedly installed on the inner side of the support ring 6. The main sealing rings 7 are slidably connected to the piston rod 4, which improves the sealing performance of the piston rod 4. A cavity 8 is formed between the two main sealing rings 7 and the piston rod 4. An external air pipe 9 is fixedly installed on the hydraulic cylinder 1. The external air pipe 9 is connected to the cavity 8. By connecting an external air source to the external air pipe 9 and inputting appropriate gas into the cavity 8 formed between the two main sealing rings 7 and the piston rod 4, the air pressure in the cavity 8 is increased, thereby expanding the two main sealing rings 7 outward and making the main sealing rings 7 fit more tightly, thus improving the sealing performance between the main sealing rings 7 and the piston rod 4. By using the structure of the auxiliary sealing mechanism, the sealing performance of the upper part of the hydraulic cylinder is further improved when the piston rod 4 moves. A fluorinated rubber sealing ring 16 is fixedly installed on the inner wall of the rigid ring 15. The inner side of the fluorinated rubber sealing ring 16 is slidably connected to the piston rod 4, thereby improving the sealing performance of the upper part of the hydraulic cylinder when the piston rod 4 moves. By fixing multiple support columns 17 above the auxiliary connecting plate 10, and fixing a ring frame 18 above the multiple support columns 17, and fixing a rubber scraper ring 19 on the inner side wall of the ring frame 18, the dust attached to the outer side of the piston rod 4 can be cleaned.
[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. A leak-proof sealing device for a hydraulic cylinder, comprising a hydraulic cylinder barrel (1); characterized in that: An upper cylinder cover (2) is fixedly installed above the hydraulic cylinder (1), and a lower cylinder cover (3) is fixedly installed below the hydraulic cylinder (1). A sliding hole is provided on the upper cylinder cover (2), and a piston rod (4) is slidably connected to the sliding hole. A piston support plate (5) is fixedly installed at the bottom of the piston rod (4), and a piston sealing mechanism is provided on the piston support plate (5). A plugging hole sealing mechanism is provided on the inner side of the upper cylinder cover (2), and the plugging hole sealing mechanism includes a support fixedly installed below the upper cylinder cover (2). A set of main sealing rings (7) is fixedly provided on the inner side of the support ring (6). The main sealing rings (7) are slidably connected to the piston rod body (4), and a cavity (8) is formed between the two main sealing rings (7) and the piston rod body (4). An external air pipe (9) is fixedly provided on the hydraulic cylinder (1). The external air pipe (9) is connected to the cavity (8). An auxiliary connecting plate (10) is fixedly provided on the upper cylinder cover (2). An auxiliary sealing mechanism is provided on the auxiliary connecting plate (10).
2. The anti-leakage sealing device for a hydraulic cylinder body according to claim 1, characterized in that: The piston sealing mechanism includes a metal ring (11) fixedly disposed on the side of the piston support plate (5), and a set of piston sealing lips (12) disposed on the outer side of the metal ring (11), the outer side of the piston sealing lips (12) being slidably connected to the inner wall of the hydraulic cylinder (1).
3. The anti-leakage sealing device for a hydraulic cylinder body according to claim 1, characterized in that: The longitudinal section of the main sealing ring (7) is T-shaped, and a polyurethane wear-resistant layer (13) is provided on the inner side of the main sealing ring (7).
4. The anti-leakage sealing device for a hydraulic cylinder body according to claim 1, characterized in that: The auxiliary sealing mechanism includes an embedded hole (14) opened on the auxiliary connecting plate (10), a rigid ring (15) is fixedly provided on the embedded hole (14), a fluorinated rubber sealing ring (16) is fixedly provided on the inner side of the rigid ring (15), and the inner side of the fluorinated rubber sealing ring (16) is slidably connected to the piston rod body (4).
5. The anti-leakage sealing device for a hydraulic cylinder body according to claim 4, characterized in that: Multiple support columns (17) are fixedly installed above the auxiliary connecting plate (10), and a ring frame (18) is fixedly installed above the multiple support columns (17). A rubber scraper ring (19) is fixedly installed on the inner side wall of the ring frame (18), and the rubber scraper ring (19) is slidably connected to the piston rod body (4).
6. The anti-leakage sealing device for a hydraulic cylinder body according to claim 1, characterized in that: The bottom of the lower cylinder head (3) is fixedly provided with a hydraulic interface (20), and the hydraulic interface (20) is provided with an external thread.