A new sealing and mounting structure of a hydraulic cylinder rear cover

Abstract

This utility model discloses a novel sealing and installation structure for the rear cover of a hydraulic cylinder. The hydraulic cylinder consists of an outer cylinder and an inner cylinder. The piston of the outer cylinder is fitted over the inner cylinder and integrally connected to an extended outer cylinder. The inner cylinder has retaining rings at both ends, a built-in sealing plug and sealing clip at one end, and a rubber ring corresponding to the retaining groove of the outer cylinder. The extended end of the piston is bolted to a retaining plate, and the other end of the extended outer cylinder is connected to a sealing front flange with a locking pin. During installation, heat fitting and press fitting processes are used, along with an electric torque wrench and pneumatic riveting equipment to ensure assembly accuracy. During operation, the hydraulic system is controlled by a PLC and pressure sensors, and temperature and vibration sensors are used for real-time monitoring. This structure solves the problems of leakage and unstable connection in traditional hydraulic cylinders through multiple sealing designs and a stable connection method. The retaining rings and rubber rings form multiple sealing defenses, and the bolts and locking pins strengthen the connection, significantly improving sealing performance and connection strength, and reducing maintenance costs.

Description

Technical Field

[0001] This utility model provides a sealing and installation structure, and particularly relates to a novel sealing and installation structure for a hydraulic cylinder rear cover. Background Technology

[0002] In hydraulic systems, hydraulic cylinders are key actuators for achieving linear reciprocating motion and energy conversion; their performance directly affects the overall system's efficiency and reliability. The rear cover seal and mounting structure of the hydraulic cylinder play a crucial role in preventing hydraulic oil leakage and ensuring a secure connection between components, making it one of the core components ensuring the normal operation of the hydraulic cylinder. A good sealing and mounting structure can effectively maintain system pressure, avoid energy loss due to leakage, and ensure stable connection of components under high-pressure, high-frequency operating conditions, preventing problems such as loosening and displacement.

[0003] Currently, traditional hydraulic cylinder rear cover sealing and installation structures mostly employ a single sealing element and simple fixing methods. In common structures, the inner and outer cylinders are sealed only by a single sealing ring, and the connection is often simply fixed with bolts. The sealing element is prone to aging and deformation due to long-term pressure and friction, and the bolts may loosen under high-frequency vibration. This structure is difficult to cope with the sealing and stability requirements under complex working conditions, and is prone to problems such as hydraulic oil leakage and unstable component connections. This not only leads to a drop in hydraulic system pressure and reduced working efficiency, but may also cause equipment failure, increase maintenance costs, and create safety hazards. Utility Model Content

[0004] In order to solve the above problems, this application provides a novel sealing and installation structure for the rear cover of a hydraulic cylinder, which solves the problems of easy leakage of hydraulic oil and unstable connection of components, improves sealing performance and stability, and reduces maintenance costs.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a novel sealing and installation structure for a hydraulic cylinder rear cover, comprising a hydraulic cylinder, wherein the hydraulic cylinder includes an outer cylinder and an inner cylinder;

[0006] The outer cylinder includes a piston movable end sleeved outside the inner cylinder and an extended outer cylinder integrally connected to the piston movable end.

[0007] Both ends of the inner cylinder are fixedly fitted with retaining rings, and the end of the inner cylinder away from the extended outer cylinder is fixedly fitted with a sealing plug, and a sealing clip is provided on the outside of the sealing plug.

[0008] Preferably, the piston movable end and the connection between the extended outer cylinder are provided with a groove, and the inner cylinder is provided with a rubber ring corresponding to the groove.

[0009] Preferably, the retaining ring is a conical rubber sleeve, which is pressed and installed inside the moving end of the piston to achieve sealing and stable installation in conjunction with the rubber ring.

[0010] Preferably, the piston movable end is a hollow cylindrical shell, and an extension end is integrally connected to the end away from the extended outer cylinder. A clamping plate is fixedly connected to the side of the extension end away from the piston movable end by a bolt structure.

[0011] Preferably, the clamping plate and the extension end are held on both sides of the clamping ring, the sealing clip is placed inside the clamping plate, and the sealing plug is clamped inside the inner cylinder.

[0012] Preferably, the end of the extended outer cylinder furthest from the piston's movable end is connected to a sealing front flange via a locking pin.

[0013] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0014] This device is based on the fundamental principles of hydraulic transmission and achieves stable operation through a unique interlocking outer and inner cylinder structure. The outer cylinder is integrally formed from a piston movable end and an extended outer cylinder. The piston movable end is fitted onto the outside of the inner cylinder. Conical rubber retaining rings at both ends of the inner cylinder are pressed and installed inside the piston movable end, forming a double seal with the corresponding rubber rings in the grooves inside the inner cylinder to prevent hydraulic oil leakage. The sealing plug inside one end of the inner cylinder and the sealing retaining clip on the outside, together with the sealing front flange at the other end of the extended outer cylinder, achieve overall sealing. The extended end of the piston movable end of the outer cylinder is connected to a retaining plate via a bolt structure, which, together with the extended end, clamps the retaining rings to ensure a stable connection between the inner and outer cylinders. During operation, hydraulic oil flows within the sealed space between the inner and outer cylinders, driving the piston movable end to reciprocate outside the inner cylinder, realizing the transfer and conversion of energy. The multiple sealing and stable connection structure ensures stable hydraulic system pressure, avoiding problems such as decreased efficiency and increased energy consumption due to leakage or loosening, effectively improving the reliability and stability of the hydraulic cylinder and meeting the needs of various working conditions.

[0015] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a novel sealing and installation structure for a hydraulic cylinder rear cover according to the present invention.

[0017] Figure 2 This is a cross-sectional view of a novel sealing and installation structure for a hydraulic cylinder rear cover according to this utility model.

[0018] Figure 3This is an exploded view of the cylinder body of a novel sealing and installation structure for the rear cover of a hydraulic cylinder according to this utility model.

[0019] Figure 4 This is a schematic diagram of the internal structure of a novel sealing and installation structure for a hydraulic cylinder rear cover according to this utility model.

[0020] As shown in the figure:

[0021] 1. Hydraulic cylinder; 2. Outer cylinder; 3. Inner cylinder; 4. Piston movable end; 5. Extended outer cylinder; 6. Snap ring; 7. Sealing plug; 8. Sealing clip; 9. Snap groove; 10. Rubber ring; 11. Extension end; 12. Bolt structure; 13. Clamping plate; 14. Locking pin; 15. Sealing front flange. Detailed Implementation

[0022] 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 protection scope of the present utility model.

[0023] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] like Figure 1 and Figure 2 As shown, a novel sealing and installation structure for a hydraulic cylinder rear cover is disclosed. Its core component, the hydraulic cylinder 1, consists of an outer cylinder 2 and an inner cylinder 3. The piston movable end 4 of the outer cylinder 2 is sleeved outside the inner cylinder 3 and integrally connected to an extended outer cylinder 5. The piston movable end 4 is a hollow cylindrical shell, with one end's extension 11 connected to a clamping plate 13 via a bolt structure 12. The other end of the extended outer cylinder 5 is connected to a sealing front flange 15 via a locking pin 14. Clamping rings 6 are fixedly sleeved on both ends of the inner cylinder 3. One end has a sealing plug 7 and an outer sealing clamp 8 inside, and a rubber ring 10 corresponding to the groove 9 at the connection point between the piston movable end 4 of the outer cylinder and the extended outer cylinder 5.

[0026] In this implementation scheme, the piston movable end 4 and the inner cylinder 3 are interference-fitted by a retaining ring 6. After being installed by compression, the retaining ring 6, made of tapered rubber sleeve, together with the rubber ring 10 inside the inner cylinder 3, fills the gap between the piston movable end 4 and the inner cylinder 3. Combined with the corresponding setting of the retaining groove 9 and the rubber ring 10, multiple sealing lines are achieved, effectively preventing hydraulic oil leakage along the gap between the inner and outer cylinders. The extension end 11 and the retaining plate 13 are fastened by bolts 12, clamping and fixing the retaining ring 6 to prevent axial displacement of the inner cylinder 3 under pressure, thus enhancing connection stability. The sealing plug 7 and the sealing clip 8 together seal the end of the inner cylinder 3. The extended outer cylinder 5 and the sealing front flange 15 are connected by locking pins 14, further improving the overall sealing performance and structural strength. From the implementation points, the superposition of multiple sealing structures and the modular connection method make sealing and installation operations simpler and more efficient. From an innovative perspective, it breaks through the limitations of traditional single seals, forming a three-dimensional sealing and stable installation system through the synergistic cooperation between components.

[0027] like Figure 3 and Figure 4 As shown, in the novel sealing and installation structure of the hydraulic cylinder rear cover, the conical rubber retaining rings 6 at both ends of the inner cylinder 3 are pressed and installed inside the piston movable end 4, working in conjunction with the rubber ring 10 inside the inner cylinder 3 to achieve sealing and stable installation. The retaining plate 13 and the extension end 11 clamp the retaining rings 6 from both sides, the sealing clip 8 is located inside the retaining plate 13, and the sealing plug 7 is clamped inside the inner cylinder 3 to ensure internal sealing; at the same time, the end of the extended outer cylinder 5 away from the piston movable end 4 is connected to the sealing front flange 15 through the locking pin 14, further enhancing the overall sealing performance and structural stability.

[0028] In this embodiment, during actual use of the device, a hydraulic pump station, as used in existing technology, is required to provide a power source for the hydraulic cylinder 1. The hydraulic pump station is connected to the hydraulic cylinder 1 through a pipeline system, delivering hydraulic oil to the sealed space formed by the inner cylinder 3 and the outer cylinder 2, driving the piston's movable end 4 to move. To ensure the cleanliness of the hydraulic oil, a filter, as used in existing technology, is also required to prevent impurities from entering the hydraulic system and affecting sealing performance and component lifespan. Furthermore, a pressure sensor is used to monitor the internal pressure of the hydraulic cylinder in real time. The pressure sensor is installed at a suitable position on the extended outer cylinder 5 via threaded connections or other means, and the data is fed back to the control system for timely adjustment of the hydraulic system's operating status. In terms of material selection, the outer cylinder 2 and inner cylinder 3 can be made of high-strength alloy steel such as 42CrMo. This material has high strength and good toughness and can withstand greater pressure. The retaining ring 6 and rubber ring 10 are made of nitrile rubber, which has good oil resistance and wear resistance, and can effectively ensure the sealing effect. The sealing plug 7 and sealing clip 8 can be made of polytetrafluoroethylene. This material has strong chemical stability and low coefficient of friction, which can enhance the sealing performance and reduce component wear. The bolt structure 12 uses 8.8 grade high-strength bolts to ensure the firmness of the connection. The locking pin 14 uses a combination of cylindrical pin and cotter pin to prevent loosening and falling off. All components work together to enable the device to operate stably and efficiently under complex working conditions.

[0029] Specifically, when installing the new sealing and installation structure of the hydraulic cylinder rear cover, the outer cylinder 2 can be horizontally fixed on the assembly table using existing hoisting equipment, and its axis can be ensured to be horizontal using positioning fixtures. First, the retaining ring 6 at one end of the inner cylinder 3 is installed using a heat-fitting method, that is, the rubber retaining ring 6 is subjected to low-temperature treatment to shrink it, and then quickly fitted onto the end of the inner cylinder 3. After returning to room temperature, an interference fit is formed. Then, the inner cylinder 3 is slowly inserted into the piston moving end 4 of the outer cylinder 2, and a press is used to press the inner cylinder 3 into place with constant pressure, ensuring that the rubber ring 10 is accurately embedded in the groove 9 at the connection between the piston moving end 4 and the extended outer cylinder 5. An electric torque wrench is used to tighten the bolt structure 12 between the extension end 11 and the clamping plate 13 according to the preset torque value, ensuring uniform and stable clamping force. The sealing plug 7 and sealing clip 8 are installed with the assistance of existing sealant. After applying silicone sealant to the edge of the sealing plug 7, it is pressed into the end of the inner cylinder 3 using a special fixture, and the sealing clip 8 is quickly fixed using a snap-fit ​​structure. When the extended outer cylinder 5 is connected to the sealing front flange 15, the positioning pin in the prior art is used for pre-positioning, and then the locking pin 14 is firmly riveted by a pneumatic riveting device.

[0030] During operation, anti-wear hydraulic oil is injected into the hydraulic system using existing hydraulic oil filling equipment, following prescribed procedures and cleanliness standards. Before starting the hydraulic pump station, an oil cleanliness tester is used to check the particle size of the hydraulic oil to ensure it meets system requirements. During operation, a programmable logic controller (PLC) controls the variable pump of the hydraulic pump station to regulate output pressure and flow. Simultaneously, temperature and vibration sensors are used to monitor the operating temperature and vibration of the hydraulic cylinders in real time. When the monitored data exceeds a preset threshold, the PLC automatically controls the hydraulic system to reduce load or shut down. An ultrasonic leak detector is used periodically to inspect sealing areas, promptly identifying potential leaks. Hydraulic oil sampling and analysis equipment is used to perform physicochemical property testing on the oil to assess seal wear and the hydraulic system's operating status, ensuring the long-term stable operation of the device.

[0031] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A novel sealing and mounting structure for a hydraulic cylinder rear cover, comprising a hydraulic cylinder (1), characterized in that: The hydraulic cylinder (1) includes an outer cylinder (2) and an inner cylinder (3); The outer cylinder (2) includes a piston movable end (4) sleeved outside the inner cylinder (3) and an extended outer cylinder (5) integrally connected to the piston movable end (4); Both ends of the inner cylinder (3) are fixedly fitted with retaining rings (6), and the inner cylinder (3) is fixedly fitted with a sealing plug (7) at the end away from the extended outer cylinder (5), and a sealing clip (8) is provided on the outside of the sealing plug (7).

2. The novel sealing and mounting structure for a hydraulic cylinder rear cover according to claim 1, characterized in that: The piston movable end (4) and the extension outer cylinder (5) are provided with a groove (9), and the inner cylinder (3) is provided with a rubber ring (10) corresponding to the groove (9).

3. The novel sealing and mounting structure for a hydraulic cylinder rear cover according to claim 1, characterized in that: The retaining ring (6) is a conical rubber sleeve that is squeezed and installed inside the piston moving end (4) to achieve sealing and stable installation in conjunction with the rubber ring (10).

4. The novel sealing and mounting structure for a hydraulic cylinder rear cover according to claim 1, characterized in that: The piston movable end (4) is a hollow cylindrical shell, and an extension end (11) is integrally connected to the end away from the extended outer cylinder (5). The side of the extension end (11) away from the piston movable end (4) is fixedly connected to a clamping plate (13) by a bolt structure (12).

5. A novel sealing and mounting structure for a hydraulic cylinder rear cover according to claim 4, characterized in that: The clamping plate (13) and the extension end (11) are held on both sides of the clamping ring (6), the sealing clip (8) is placed inside the clamping plate (13), and the sealing plug (7) is clamped inside the inner cylinder (3).

6. The novel sealing and mounting structure for a hydraulic cylinder rear cover according to claim 1, characterized in that: The end of the extended outer cylinder (5) away from the piston moving end (4) is connected to a sealing front flange (15) via a locking pin (14).

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