Buffer seal structure against hydraulic impact

Abstract

This utility model relates to the field of hydraulic cylinder technology and discloses a buffer sealing structure for resisting hydraulic shock. It includes a cylinder body with an oil inlet and an oil outlet sequentially installed from front to back on the top of the cylinder body. An oil chamber is formed in the middle of the cylinder body. A piston block is slidably connected inside the cylinder body, located in the middle of the oil chamber. A piston rod is slidably connected to the middle of the cylinder body, and the piston rod is connected to the piston block. A sealing ring is installed on the outer periphery of the piston block. A movable ring is slidably connected to the middle of the piston block, and a buffer pad is installed on the outer side of the movable ring. In this utility model, when the piston block slides in the oil chamber and approaches the end of the cylinder body, the buffer pad contacts the inner wall of the cylinder body end, thereby pushing the movable ring to compress the compression spring. The compression spring absorbs and reduces the impact force, while the buffer pad prevents further absorption and reduction of impact force and avoids wear caused by collision.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a buffer sealing structure that resists hydraulic shock. Background Technology

[0002] Hydraulic cylinders, as the core actuators in hydraulic systems, play a crucial role in efficiently converting the pressure energy of hydraulic oil into linear reciprocating mechanical energy. Due to their significant advantages such as high power density, strong load-bearing capacity, smooth and controllable motion, and flexible layout, they have been widely used in fields including but not limited to: engineering machinery, industrial manufacturing, transportation, agricultural and forestry machinery, and automation equipment. It can be said that hydraulic cylinders are the cornerstone of reliable power transmission and precise motion control in modern industry and equipment.

[0003] However, behind the widespread application of hydraulic cylinders, a long-standing and unresolved problem continues to affect their performance and service life: when the piston reaches its stroke limit, it inevitably collides rigidly with the hydraulic cylinder end cap. This high-speed impact at the end not only causes noise pollution but also leads to piston seal failure and leakage under the influence of the impact force. To address this issue, a buffer sealing structure resistant to hydraulic shock is proposed. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a buffer sealing structure that resists hydraulic shock, aiming to improve the problem in the prior art where the piston movement causes a rigid collision with the hydraulic cylinder end cover, thereby affecting the sealing structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A hydraulic shock resistant buffer sealing structure includes a cylinder body. An oil inlet and an oil outlet are sequentially installed on the top of the cylinder body from front to back. An oil chamber is formed in the middle of the cylinder body. A piston block is slidably connected inside the cylinder body, located in the middle of the oil chamber. A piston rod is slidably connected to the middle of the cylinder body, and the piston rod is connected to the piston block. A sealing ring is installed on the outer periphery of the piston block. A movable ring is slidably connected to the middle of the piston block. A buffer pad is installed on the outer side of the movable ring. An elastic component is installed between the piston block and the movable ring.

[0007] The elastic component includes a compression spring, which is installed in the middle of the piston block. A groove is formed in the middle of the piston block, and the movable ring is slidably connected to the middle of the groove.

[0008] As a further description of the above technical solution:

[0009] The piston block is threadedly connected to a bolt, and the movable ring is slidably connected to the outer circumference of the bolt.

[0010] As a further description of the above technical solution:

[0011] The buffer pad is slidably connected to the middle of a bolt two, the other end of which passes through the movable ring, and a nut is threaded onto the outer circumference of the bolt two.

[0012] As a further description of the above technical solution:

[0013] The buffer pad has a groove in the middle, and the end of the bolt two away from the nut is located in the middle of the groove;

[0014] As a further description of the above technical solution:

[0015] The compression spring is sleeved on the outer periphery of the bolt;

[0016] As a further description of the above technical solution:

[0017] The inner diameter of the buffer pad is larger than the outer diameter of the piston rod.

[0018] This utility model has the following beneficial effects:

[0019] 1. In this utility model, when the piston block slides in the oil chamber and comes into contact with the end of the cylinder, the buffer pad will contact the inner wall of the end of the cylinder, thereby pushing the movable ring to squeeze the compression spring. Then, under the action of the compression spring, the impact force is absorbed and reduced. At the same time, under the action of the buffer pad, further absorption and reduction of impact force is avoided and collisions are prevented from causing wear. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a buffer sealing structure for resisting hydraulic shock proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the oil cavity of a buffer sealing structure for resisting hydraulic shock proposed in this utility model;

[0022] Figure 3 This is a schematic diagram of the piston block of a buffer sealing structure for resisting hydraulic shock proposed in this utility model;

[0023] Figure 4 This is a schematic diagram of the buffer pad of the hydraulic shock resistant buffer sealing structure proposed in this utility model.

[0024] Legend:

[0025] 1. Cylinder block; 2. Oil inlet; 3. Oil outlet; 4. Piston rod; 5. Piston block; 6. Sealing ring; 7. Oil chamber; 8. Moving ring; 9. Bolt 1; 10. Buffer pad; 11. Groove; 12. Compression spring; 13. Bolt 2; 14. Nut; 15. Slide groove. Detailed Implementation

[0026] 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.

[0027] Reference Figures 1-3 This utility model provides an embodiment of a hydraulic shock-resistant buffer sealing structure, comprising a cylinder body 1. An oil inlet 2 and an oil outlet 3 are sequentially installed on the top of the cylinder body 1 from front to back. An oil chamber 7 is formed in the middle of the cylinder body 1. A piston block 5 is slidably connected inside the cylinder body 1, located in the middle of the oil chamber 7. A piston rod 4 is slidably connected to the middle of the cylinder body 1, and the piston rod 4 is connected to the piston block 5. A sealing ring 6 is installed on the outer periphery of the piston block 5. A movable ring 8 is slidably connected to the middle of the piston block 5. A buffer pad 10 is installed on the outer side of the movable ring 8. An elastic component is installed between the piston block 5 and the movable ring 8. The elastic component includes a compression spring 12, which is installed in the middle of the piston block 5. A groove 15 is formed in the middle of the piston block 5, and the movable ring 8 is slidably connected to the middle of the groove 15. The inner diameter of the buffer pad 10 is larger than the outer diameter of the piston rod 4. First, after oil enters through the oil inlet 2, the piston block 5 slides in the middle of the oil chamber 7 under the push of the oil and drives the piston rod 4 to move. When the piston block 5 moves to the end of the inner wall of the cylinder 1, the buffer pad 10 will contact the end of the cylinder 1, thereby squeezing the movable ring 8. This causes the movable ring 8 to slide in the middle of the slide groove 15 and squeeze the compression spring 12. Under the action of the compression spring 12, the transmission of the impact force generated by the collision is absorbed and reduced. At the same time, when the compression spring 12 contracts to its limit, the buffer pad 10 will deform under the compression, thereby further absorbing and reducing the impact force and preventing the piston block 5 from directly contacting the end of the cylinder 1 to cause wear and sound transmission. This ensures that the piston seal will not fail or leak due to the collision.

[0028] Reference Figures 2-4A bolt 9 is threadedly connected to the center of the piston block 5. A movable ring 8 is slidably connected to the outer circumference of bolt 9. A bolt 13 is slidably connected to the center of the buffer pad 10. The other end of bolt 13 passes through the movable ring 8. A nut 14 is threadedly connected to the outer circumference of bolt 13. A groove 11 is formed in the center of the buffer pad 10. The end of bolt 13 away from nut 14 is located in the center of groove 11. A compression spring 12 is sleeved on the outer circumference of bolt 9. After prolonged use, bolt 9 can be loosened to separate it from the piston block 5, allowing the movable ring 8 to be removed from the slide groove 15. This allows the compression spring 12 to be removed and replaced, preventing it from failing due to prolonged use. After removing the movable ring 8, a screwdriver can be inserted into groove 11 to loosen bolt 13 and nut 14, allowing the worn buffer pad 10 to be replaced. This facilitates the replacement of both the compression spring 12 and the buffer pad 10, reducing maintenance costs.

[0029] Working principle: First, when the piston block 5 slides in the oil chamber 7 and comes into contact with the end of the cylinder 1, the buffer pad 10 will come into contact with the inner wall of the end of the cylinder 1, thereby pushing the movable ring 8 to squeeze the compression spring 12. Then, under the action of the compression spring 12, the impact force is absorbed and reduced. At the same time, after the compression spring 12 is contracted to its limit, the buffer pad 10 will be squeezed and deformed. Then, under the action of the buffer pad 10, further absorption and reduction of impact force is avoided and the end of the cylinder 1 is prevented from directly contacting the piston block 5 and causing wear.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cushion seal structure against hydraulic impact, comprising a cylinder (1), characterized in that: The top of the cylinder (1) is provided with an oil inlet (2) and an oil outlet (3) in sequence from front to back. An oil chamber (7) is provided in the middle of the cylinder (1). A piston block (5) is slidably connected inside the cylinder (1). The piston block (5) is located in the middle of the oil chamber (7). A piston rod (4) is slidably connected in the middle of the cylinder (1). The piston rod (4) is connected to the piston block (5). A sealing ring (6) is installed on the outer periphery of the piston block (5). A movable ring (8) is slidably connected in the middle of the piston block (5). A buffer pad (10) is installed on the outer side of the movable ring (8). An elastic component is installed between the piston block (5) and the movable ring (8). The elastic component includes a compression spring (12), which is installed in the middle of the piston block (5). A groove (15) is provided in the middle of the piston block (5), and the movable ring (8) is slidably connected to the middle of the groove (15).

2. The cushion seal structure against hydraulic impact according to claim 1, wherein: The piston block (5) is threaded with a bolt (9) in the middle, and the movable ring (8) is slidably connected to the outer periphery of the bolt (9).

3. The hydraulic shock resistant buffer sealing structure according to claim 1, characterized in that: The buffer pad (10) is slidably connected to a bolt two (13) in the middle, and the other end of the bolt two (13) passes through the movable ring (8). The outer circumference of the bolt two (13) is threaded with a nut (14).

4. The cushion seal structure against hydraulic impact according to claim 3, wherein: The buffer pad (10) has a groove (11) in the middle, and the end of the bolt (13) away from the nut (14) is located in the middle of the groove (11).

5. The cushion seal structure against hydraulic impact according to claim 2, wherein: The compression spring (12) is sleeved on the outer periphery of the bolt (9).

6. The cushion seal structure against hydraulic impact according to claim 1, wherein: The inner diameter of the buffer pad (10) is larger than the outer diameter of the piston rod (4).

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