Piston structure of hydraulic cylinder

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a piston structure of a hydraulic cylinder, which comprises a cylinder body, a piston component is arranged in the cylinder body, and a piston rod is arranged in the piston component. The first annular sealing plate and the second annular sealing plate on one side of the plug body are inserted into the first annular sealing groove and the second annular sealing groove in the side of the second plug body respectively, so that the first annular sealing plate extrudes the first sealing ring, the second annular sealing plate extrudes the second sealing ring, and the sealing performance between the first plug body and the second plug body is enhanced; hydraulic oil is prevented from easily penetrating through a gap between the first plug body and the second plug body, and normal use of the hydraulic cylinder is guaranteed; and meanwhile, the buffer spring buffers and absorbs destructive force generated by collision, the end cover is prevented from being damaged, and then a hydraulic system is protected to a certain degree.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a piston structure of a hydraulic cylinder. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When using it to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap and the motion is smooth. Therefore, it is widely used in the hydraulic systems of various machines. The hydraulic cylinder mainly includes a cylinder body, a piston rod and a piston structure. The piston structure mainly separates the hydraulic oil in the two oil chambers, thereby ensuring that the piston rod is driven to move back and forth in the cylinder body.

[0003] Application number: CN202123438048.5 "Piston structure and hydraulic cylinder" Compared with the prior art, a first plug body and a second plug body are provided, and the first plug body and the second plug body are provided as a split assembly, and an annular groove can be directly formed between the first plug body and the second plug body. By adjusting the width of the annular groove, in addition to ensuring the stable clamping effect of the sealing ring, the extrusion force of the sealing ring can also be adjusted. When the sealing ring is squeezed and deformed, the sealing ring will extend to the outside of the annular groove, thereby ensuring a close contact with the inner wall of the cylinder body. This structure changes the previous one-piece piston structure, can ensure the installation of the sealing ring, and can adapt to the manufacturing errors of each component, ensure the assembly effect, and can improve the service life. It is highly practical.

[0004] In the above piston structure and hydraulic cylinder, one end of the piston rod directly passes through the through hole, and the tail end can lock the first plug body and the second plug body to the piston rod through a nut, but the hydraulic oil can easily pass through the gap between the first plug body and the second plug body, thereby affecting the use of the hydraulic cylinder. When the hydraulic cylinder is working at high speed, if the piston directly collides with the end cover of the hydraulic cylinder, the end cover will be damaged under the action of inertia force and hydraulic pressure, and a large impact load will be generated, which will have an adverse effect on the hydraulic system. Utility Model Content

[0005] The utility model aims to provide a piston structure of a hydraulic cylinder, which can enhance the sealing performance between a first plug body and a second plug body, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the utility model provides the following technical solutions: a piston structure of a hydraulic cylinder, comprising a cylinder body, a piston assembly is arranged inside the cylinder body, and a piston rod is arranged inside the piston assembly;

[0007] Among them, the piston assembly includes: a plug body 1 and a plug body 2, the side of the plug body 2 is provided with an annular sealing groove 1 and an annular sealing groove 2, a sealing ring 1 is installed in the annular sealing groove 1, and a sealing ring 2 is installed in the annular sealing groove 2, the groove wall of the annular sealing groove 1 is slidably connected to the outside of the annular sealing plate 1, the groove wall of the annular sealing groove 2 is slidably connected to the outside of the annular sealing plate 2, and the annular sealing plate 1 and the annular sealing plate 2 are integrally formed with the plug body 1.

[0008] Preferably, a second installation groove is provided on the outside of the second plug body, and a second guide ring is installed on the groove wall of the second installation groove.

[0009] Preferably, a mounting groove 1 is provided on the outside of the plug body 1, and a guide ring 1 is installed on the groove wall of the mounting groove 1.

[0010] Preferably, a sealing ring three is provided on the outside of the annular sealing plate one, and the sealing ring three is located between the plug body one and the plug body two.

[0011] Preferably, a mounting groove three is provided on the outside of the piston rod, a sealing ring four is installed in the mounting groove three, and the sealing ring four is located between the plug body one and the piston rod.

[0012] Preferably, the outer portion of the piston rod is fixedly inserted into the inner ring of the fixing plate, and the outer portion of one end of the piston rod is threadedly connected to the inner ring of the nut.

[0013] Preferably, the outer portion of the piston rod is slidably inserted into the inner rings of the plug body 1 and the plug body 2, and the plug body 1 and the plug body 2 are located between the nut and the fixing plate.

[0014] Preferably, one side of the fixed plate is fixedly connected to one end of the buffer spring, the other end of the buffer spring is fixedly connected to one side of the sliding plate, and the inner rings of the sliding plate and the buffer spring are both slidably sleeved on the outside of the piston rod.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model inserts the annular sealing plate 1 and the annular sealing plate 2 on one side of the plug body into the annular sealing groove 1 and the annular sealing groove 2 on the side of the plug body 2 respectively, so that the annular sealing plate 1 squeezes the sealing ring 1 and the annular sealing plate 2 squeezes the sealing ring 2, thereby enhancing the sealing between the plug body 1 and the plug body 2, preventing the hydraulic oil from easily passing through the gap between the plug body 1 and the plug body 2, and ensuring the normal use of the hydraulic cylinder; at the same time, the buffer spring buffers and absorbs the destructive force generated by the impact, prevents the end cover from being damaged, and thus forms a certain protection for the hydraulic system.

[0017] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the piston assembly of the utility model;

[0020] Figure 3 This is a schematic diagram of the explosion structure of the piston assembly of the utility model;

[0021] Figure 4 This is a schematic diagram of the piston rod structure of the utility model.

[0022] In the figure: 1. Piston assembly; 2. Cylinder body; 3. Piston rod; 4. Guide ring 1; 5. Sealing ring 3; 6. Guide ring 2; 7. Sealing ring 1; 8. Sealing ring 2; 9. Sealing ring 4; 11. Plug body 1; 12. Plug body 2; 13. Mounting groove 1; 14. Annular sealing plate 1; 15. Annular sealing plate 2; 16. Annular sealing groove 1; 17. Annular sealing groove 2; 31. Nut; 32. Mounting groove 3; 33. Fixed plate; 34. Buffer spring; 35. Sliding plate. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-4 The utility model provides a technical solution: a piston structure of a hydraulic cylinder, comprising: a cylinder body 2, a piston assembly 1 is arranged inside the cylinder body 2, and a piston rod 3 is arranged inside the piston assembly 1.

[0025] The piston assembly 1 includes: a plug body 11 and a plug body 12. The side of the plug body 12 is provided with an annular sealing groove 16 and an annular sealing groove 17. A sealing ring 17 is installed in the annular sealing groove 16, and a sealing ring 28 is installed in the annular sealing groove 17. The groove wall of the annular sealing groove 16 is slidably connected to the outside of the annular sealing plate 14, and the groove wall of the annular sealing groove 2 17 is slidably connected to the outside of the annular sealing plate 2 15. The annular sealing plate 14 and the annular sealing plate 2 15 are integrally formed with the plug body 11.

[0026] Furthermore, when in use, first install the sealing ring 7 into the annular sealing groove 16, install the sealing ring 28 into the annular sealing groove 17, then sleeve the plug body 212 on the outside of the piston rod 3, and the side of the plug body 212 away from the annular sealing groove 16 is connected to the fixed plate 33, then sleeve the sealing ring 35 on the outside of the annular sealing plate 14, and then sleeve the plug body 11 on the outside of the piston rod 3, and the annular sealing plate 14 on one side of the plug body 11 is inserted into the annular sealing groove 16, and the annular sealing plate Insert the annular sealing groove 15 into the annular sealing groove 17, then install the nut 31 on the end of the piston rod 3, rotate the nut 31 to move it in the direction of the fixing plate 33, so that the nut 31 pushes the plug body 11 to move in the direction of the plug body 2 12, and then the annular sealing plate 14 squeezes the sealing ring 17, and the annular sealing plate 2 15 squeezes the sealing ring 2 8, so that the hydraulic oil can be prevented from easily passing through the gap between the plug body 11 and the plug body 2 12, thereby ensuring the normal use of the hydraulic cylinder.

[0027] The plug body 12 is provided with a mounting groove 18 on its exterior, and a guide ring 6 is installed on the groove wall of the mounting groove 18. The plug body 11 is provided with a mounting groove 13 on its exterior, and a guide ring 4 is installed on the groove wall of the mounting groove 13.

[0028] Furthermore, guide ring 1 4 and guide ring 2 6 are respectively used to support the moving parts of plug body 1 1 and plug body 2 12. Guide ring 1 4 and guide ring 2 6 can prevent plug body 1 1 and plug body 2 12 from direct contact and friction with cylinder body 2 during movement, thereby protecting cylinder body 2 and plug body 1 1 and plug body 2 12 from damage.

[0029] A sealing ring 3 5 is provided on the outside of the annular sealing plate 14 , and the sealing ring 3 5 is located between the plug body 1 11 and the plug body 2 12 .

[0030] Furthermore, the sealing ring 3 5 is used to enhance the sealing between the plug body 11 and the inner wall of the cylinder body 2.

[0031] The outside of the piston rod 3 is provided with a mounting groove 32, and a sealing ring 49 is installed in the mounting groove 32. The sealing ring 49 is located between the plug body 11 and the piston rod 3.

[0032] Furthermore, the sealing ring 4 9 is used to enhance the sealing between the plug body 1 11, the plug body 2 12 and the piston rod 3.

[0033] The outer portion of the piston rod 3 is fixedly inserted into the inner ring of the fixing plate 33 , and the outer portion of one end of the piston rod 3 is threadedly connected to the inner ring of the nut 31 .

[0034] The outer portion of the piston rod 3 is slidably inserted into the inner rings of the plug body 11 and the plug body 2 12 , and the plug body 11 and the plug body 2 12 are located between the nut 31 and the fixing plate 33 .

[0035] One side of the fixed plate 33 is fixedly connected to one end of the buffer spring 34 , and the other end of the buffer spring 34 is fixedly connected to one side of the sliding plate 35 . The inner rings of the sliding plate 35 and the buffer spring 34 are both slidably sleeved on the outside of the piston rod 3 .

[0036] Furthermore, when the piston assembly 1 moves to the end cover position of the hydraulic cylinder, the sliding plate 35 hits the end cover of the hydraulic cylinder, thereby causing the sliding plate 35 to move toward the fixed plate 33. The sliding plate 35 will compress the buffer spring 34, causing the buffer spring 34 to buffer and absorb the destructive force generated by the impact, thereby preventing damage to the end cover and providing certain protection for the hydraulic system.

[0037] Working principle: When in use, first install the sealing ring 7 into the annular sealing groove 16, install the sealing ring 28 into the annular sealing groove 17, then sleeve the plug body 212 on the outside of the piston rod 3, and the side of the plug body 212 away from the annular sealing groove 16 is connected to the fixed plate 33, then sleeve the sealing ring 35 on the outside of the annular sealing plate 14, then sleeve the plug body 11 on the outside of the piston rod 3, and the annular sealing plate 14 on one side of the plug body 11 is inserted into the annular sealing groove 16, and the annular sealing plate Insert the annular sealing groove 15 into the annular sealing groove 17, then install the nut 31 at the end of the piston rod 3, rotate the nut 31 to move it in the direction of the fixed plate 33, so that the nut 31 pushes the plug body 11 to move in the direction of the plug body 2 12, and then the annular sealing plate 14 squeezes the sealing ring 17, and the annular sealing plate 2 15 squeezes the sealing ring 2 8, so that the hydraulic oil can be prevented from easily passing through the gap between the plug body 11 and the plug body 2 12, ensuring the normal use of the hydraulic cylinder. When the piston assembly 1 moves to the end cover position of the hydraulic cylinder, the sliding plate 35 hits the end cover of the hydraulic cylinder, and then the sliding plate 35 moves in the direction of the fixed plate 33, and the sliding plate 35 will compress the buffer spring 34, so that the buffer spring 34 buffers and absorbs the destructive force generated by the collision, preventing the end cover from being damaged, and thus forming a certain protection for the hydraulic system.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A piston structure of a hydraulic cylinder, characterized in that: It comprises a cylinder body (2), a piston assembly (1) is arranged inside the cylinder body (2), and a piston rod (3) is arranged inside the piston assembly (1); The piston assembly (1) comprises: a plug body 1 (11) and a plug body 2 (12); a side of the plug body 2 (12) is provided with an annular sealing groove 1 (16) and an annular sealing groove 2 (17); a sealing ring 1 (7) is installed in the annular sealing groove 1 (16); a sealing ring 2 (8) is installed in the annular sealing groove 2 (17); a groove wall of the annular sealing groove 1 (16) is slidably connected to the outside of an annular sealing plate 1 (14); a groove wall of the annular sealing groove 2 (17) is slidably connected to the outside of an annular sealing plate 2 (15); the annular sealing plate 1 (14) and the annular sealing plate 2 (15) are integrally formed with the plug body 1 (11).

2. The piston structure of a hydraulic cylinder according to claim 1, characterized in that: The second plug body (12) is provided with a second installation groove (18) on its exterior, and a second guide ring (6) is installed on the groove wall of the second installation groove (18).

3. The piston structure of a hydraulic cylinder according to claim 1, characterized in that: The plug body (11) is provided with a mounting groove (13) on its exterior, and a guide ring (4) is installed on the groove wall of the mounting groove (13).

4. The piston structure of a hydraulic cylinder according to claim 1, characterized in that: A sealing ring three (5) is provided outside the annular sealing plate one (14), and the sealing ring three (5) is located between the plug body one (11) and the plug body two (12).

5. The piston structure of a hydraulic cylinder according to claim 1, characterized in that: The piston rod (3) is provided with a mounting groove three (32) on the outside, a sealing ring four (9) is installed in the mounting groove three (32), and the sealing ring four (9) is located between the plug body one (11) and the piston rod (3).

6. The piston structure of a hydraulic cylinder according to claim 1, characterized in that: The outer portion of the piston rod (3) is fixedly inserted into the inner ring of the fixing plate (33), and the outer portion of one end of the piston rod (3) is threadedly connected to the inner ring of the nut (31).

7. The piston structure of a hydraulic cylinder according to claim 6, characterized in that: The outer portion of the piston rod (3) is slidably inserted into the inner rings of the plug body 1 (11) and the plug body 2 (12), and the plug body 1 (11) and the plug body 2 (12) are located between the nut (31) and the fixing plate (33).

8. The piston structure of a hydraulic cylinder according to claim 7, characterized in that: One side of the fixed plate (33) is fixedly connected to one end of the buffer spring (34), and the other end of the buffer spring (34) is fixedly connected to one side of the sliding plate (35). The inner rings of the sliding plate (35) and the buffer spring (34) are both slidably sleeved on the outside of the piston rod (3).

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