Hydraulic cylinder capable of preventing piston impact

Abstract

One end of a cylinder body is open and provided with an end cover through a flange, one end of a piston rod is connected with the piston, the piston is movably arranged in the cylinder body, the piston rod penetrates through a center hole of the end cover and is in sliding fit with the end cover, and a groove is formed in the end, away from the end cover, in the cylinder body. A plurality of first buffering gaskets are arranged on the inner side of the end cover through a first annular groove, a plurality of second buffering gaskets are arranged on the end face of the end, away from the piston rod, of the piston through a second annular groove, and a rubber pad is arranged on an extension rod at the end of the piston rod. Direct collision between the piston and the end cover can be prevented through the first buffer gasket, direct collision between the piston and the inner end of the cylinder body can be prevented through the second buffer gasket, the extension rod at the outer end of the piston rod is provided with the rubber pad, direct collision between the piston and the inner end of the cylinder body can be further prevented, and therefore the service life of the hydraulic cylinder is prolonged; and noise caused by impact of the piston is avoided.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a hydraulic cylinder that can prevent piston impact. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing 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, eliminates transmission backlash, and provides smooth movement. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] Currently, when the piston inside the hydraulic cylinder moves back and forth within the cylinder, the front end face of the piston is prone to direct collision with the end cap when the piston rod is fully extended, and the rear end face of the piston is prone to direct collision with the innermost end of the cylinder when the piston rod is fully retracted. This leads to a reduction in the service life of the piston, cylinder, or end cap, and also generates noise during the impact. Therefore, an improved technology is urgently needed to solve this problem in the existing technology. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic cylinder that can prevent piston impact. A first buffer washer is provided in the first annular groove on the inner side of the end cap, and a second buffer washer is provided in the second annular groove at the end of the piston away from the piston rod. The first buffer washer can prevent direct collision between the piston and the end cap, and the second buffer washer can prevent direct collision between the piston and the inner end of the cylinder body. The extension rod at the outer end of the piston rod is provided with a rubber pad to further prevent direct collision between the piston and the inner end of the cylinder body, thereby improving the service life of the hydraulic cylinder and preventing noise caused by piston impact, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic cylinder that can prevent piston impact, comprising a cylinder body, an end cap, a piston rod and a piston, wherein one end of the cylinder body is open and an end cap is provided through a flange, one end of the piston rod is connected to a piston, the piston is movably disposed in the cylinder body, the end cap has a central hole extending through it along the axial direction, and the piston rod passes through the central hole of the end cap and slides in cooperation with the end cap.

[0006] A groove is provided inside the cylinder body and at one end away from the end cap. A first oil passage is provided through one side of the cylinder body. The first oil passage is connected to the groove and the first oil passage is connected to the inside of the cylinder body through the groove.

[0007] A second oil passage is provided through one side of the end cap. A connecting groove is provided in the center hole of the end cap. The second oil passage is connected to the connecting groove. The second oil passage is connected to the inside of the cylinder through a connecting groove. A plurality of first annular grooves are provided on the inner side of the end cap. A first buffer washer is provided in the first annular groove.

[0008] The piston has several second annular grooves on its end face away from the piston rod. A second buffer washer is provided in the second annular groove. An extension rod is provided at the center of one end of the piston rod. The extension rod passes through the piston and a rubber pad is provided at the end away from the piston rod. The end of the extension rod away from the piston rod and the rubber pad are both movably disposed in the cylinder and the groove.

[0009] Preferably, the present invention provides a hydraulic cylinder that can prevent piston impact, wherein the cylinder body has a first connecting hole at the end away from the end cover.

[0010] Preferably, the present invention provides a hydraulic cylinder that can prevent piston impact, wherein a connecting member is provided at the end of the piston rod away from the piston, and the connecting member is provided with a second connecting hole.

[0011] Preferably, the present invention provides a hydraulic cylinder that can prevent piston impact, wherein the cylinder body located at the outer end of the first oil passage and the end cover located at the outer end of the second oil passage are both bolted with cover plates.

[0012] Preferably, the present invention provides a hydraulic cylinder that can prevent piston impact, wherein the outer surface of the piston is provided with a plurality of third annular grooves along the circumferential direction, and the third annular grooves are provided with rubber rings.

[0013] Preferably, the present invention provides a hydraulic cylinder that can prevent piston impact, wherein a plurality of fourth annular grooves are further provided on the inner wall of the central hole of the end cap, and sealing packing is provided in the fourth annular grooves.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] A first buffer washer is provided in the first annular groove on the inner side of the end cap, and a second buffer washer is provided in the second annular groove at the end of the piston away from the piston rod. The first buffer washer can prevent direct collision between the piston and the end cap, and the second buffer washer can prevent direct collision between the piston and the inner end of the cylinder. The extension rod at the outer end of the piston rod is provided with a rubber pad to further prevent direct collision between the piston and the inner end of the cylinder, thereby improving the service life of the hydraulic cylinder and preventing noise caused by piston impact. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 A schematic diagram of the cross-sectional structure of the cylinder block located at the groove;

[0018] Figure 3 This is a schematic diagram of the end cap cross-section structure;

[0019] Figure 4 This is a schematic diagram of the piston structure;

[0020] Figure 5 This is a schematic diagram of the appearance and structure of this utility model.

[0021] In the diagram: 1. Cylinder body; 2. End cap; 3. Piston rod; 4. Piston; 5. Center hole; 6. Groove; 7. First oil passage; 8. Second oil passage; 9. Connecting groove; 10. First annular groove; 11. First buffer washer; 12. Second annular groove; 13. Second buffer washer; 14. Extension rod; 15. Rubber pad; 16. First connecting hole; 17. Connector; 18. Second connecting hole; 19. Cover plate; 20. Third annular groove; 21. Rubber ring; 22. Fourth annular groove; 23. Sealing filler. Detailed Implementation

[0022] The technical solution of this 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 this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] It should be noted that in the description of this utility model, the terms "inner", "outer", "upper", "lower", "both sides", "one end", "the other end", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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.

[0024] Please see Figure 1-5This utility model provides a technical solution: a hydraulic cylinder that can prevent piston impact, including a cylinder body 1, an end cap 2, a piston rod 3, and a piston 4. One end of the cylinder body 1 is open and the end cap 2 is provided through a flange. One end of the piston rod 3 is connected to the piston 4. The piston 4 is movably disposed inside the cylinder body 1. The outer surface of the piston 4 has a plurality of third annular grooves 20 formed along the circumferential direction. Rubber rings 21 are provided in the third annular grooves 20 to ensure a tight connection between the piston 4 and the inner wall of the cylinder body 1, preventing piston impact inside the cylinder body 1. The oil at both ends of the piston 4 is interconnected. The end cap 2 has a central hole 5 through it along the axial direction. The piston rod 3 passes through the central hole 5 of the end cap 2 and slides with the end cap 2. Several fourth annular grooves 22 are also provided on the inner wall of the central hole 5 of the end cap 2. Sealing packing 23 is provided in the fourth annular grooves 22 to ensure the sealing of the connection between the piston rod 3 and the end cap 2. A connector 17 is provided at the end of the piston rod 3 away from the piston 4. The connector 17 is provided with a second connecting hole 18 to realize the shaft connection with another connecting object.

[0025] A groove 6 is provided inside the cylinder body 1 and at the end away from the end cover 2. A first oil passage 7 is provided through one side of the cylinder body 1. The first oil passage 7 is connected to the groove 6. The first oil passage 7 is connected to the inside of the cylinder body 1 through the groove 6. A first connecting hole 16 is provided at the end of the cylinder body 1 away from the end cover 2 to realize shaft connection with the connecting object.

[0026] A second oil passage 8 is provided through one side of the end cover 2. The cylinder body 1 located at the outer end of the first oil passage 7 and the end cover 2 located at the outer end of the second oil passage 8 are both provided with cover plates 19 by bolts to prevent dust from entering the cylinder body before use. The end cover 2 has a connecting groove 9 in the center hole 5. The second oil passage 8 is connected to the connecting groove 9. The second oil passage 8 is also connected to the inside of the cylinder body 1 through the connecting groove 9. Several first annular grooves 10 are provided on the inner side of the end cover 2. A first buffer washer 11 is provided in the first annular groove 10.

[0027] The piston 4 has several second annular grooves 12 on its end face away from the piston rod 3. A second buffer washer 13 is provided in the second annular groove 12. An extension rod 14 is provided at the center of one end of the piston rod 3. The extension rod 14 passes through the piston 4 and a rubber pad 15 is provided at the end away from the piston rod 3. The end of the extension rod 14 away from the piston rod 3 and the rubber pad 15 are both movably disposed in the cylinder body 1 and the groove 6.

[0028] Installation method and operating principle: The piston 4 is fitted onto the extension rod 14 of the piston rod 3 and then welded. The connecting piece 17 is fitted onto the end of the piston rod 3 away from the piston 4 and then welded to fix it. First, insert the first buffer washer 11 of different diameters into the corresponding first annular groove 10 of the end cover 2. Then, insert the second buffer washer 13 of different diameters into the corresponding second annular groove 12 of the piston 4. Put the rubber ring 21 on the outside of the piston 4 and insert it into the corresponding third annular groove 20. Insert the sealing filler 23 into the fourth annular groove 22 of the end cover 2. Then, connect the rubber gasket 15 to the extension rod 14 of the piston 4 away from the piston rod 3 with bolts. Then, insert the piston 4 into the cylinder body 1. Next, fit the center hole 5 of the end cover 2 onto the piston rod 3 and connect the end cover 2 to the end of the cylinder body 1 with flanges and bolts to complete the assembly. In use, the cover plate 19 is opened, and the oil passages are connected to the first oil passage 7 and the second oil passage 8 respectively. Oil enters the oil cylinder from the first oil passage 7, and the piston 4 moves forward. The oil at the front end returns through the second oil passage 8, and the oil enters the oil cylinder from the second oil passage 8. The piston 4 moves backward, and the oil at the rear end returns through the first oil passage 7. During the process, when the piston 4 moves to the end cover 2, the first buffer washer 11 prevents the piston 4 from directly impacting the end cover 2. When the piston 4 moves backward, the second buffer washer 13 at the rear end of the piston 4 prevents the piston 4 from directly impacting the inner end of the cylinder body 1. At the same time, the outer end 14 of the extension rod and the rubber pad 15 enter the groove 6, and the rubber pad 15 further improves the cushioning. This utility model has a reasonable structure. A first buffer washer 11 is provided in the first annular groove 10 on the inner side of the end cover 2, and a second buffer washer 13 is provided in the second annular groove 12 at the end of the piston 4 away from the piston rod 3. The first buffer washer 11 can prevent the piston 4 from directly colliding with the end cover 2, and the second buffer washer 13 can prevent the piston 4 from directly colliding with the inner end of the cylinder body 1. A rubber pad 15 is provided at the outer end of the extension rod 14 to further prevent the piston 4 from directly colliding with the inner end of the cylinder body 1, thereby improving the service life of the hydraulic cylinder and preventing noise caused by the piston 4 impact.

[0029] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0030] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hydraulic cylinder capable of preventing piston impact, characterized in that: The cylinder includes a cylinder body (1), an end cap (2), a piston rod (3), and a piston (4). One end of the cylinder body (1) is open and is fitted with an end cap (2) via a flange. One end of the piston rod (3) is connected to the piston (4). The piston (4) is movably disposed inside the cylinder body (1). The end cap (2) has a central hole (5) extending through it along the axial direction. The piston rod (3) passes through the central hole (5) of the end cap (2) and slides with the end cap (2). The cylinder body (1) has a groove (6) inside and away from the end cap (2). A first oil passage (7) is provided through one side of the cylinder body (1). The first oil passage (7) is connected to the groove (6). The first oil passage (7) is connected to the inside of the cylinder body (1) through the groove (6). A second oil passage (8) is provided through one side of the end cap (2). A connecting groove (9) is provided in the center hole (5) of the end cap (2). The second oil passage (8) is connected to the connecting groove (9). The second oil passage (8) is connected to the inside of the cylinder (1) through the connecting groove (9). A plurality of first annular grooves (10) are provided on the inner side of the end cap (2). A first buffer washer (11) is provided in the first annular groove (10). The piston (4) has several second annular grooves (12) on the end face away from the piston rod (3). A second buffer washer (13) is provided in the second annular groove (12). An extension rod (14) is provided at the center of one end of the piston rod (3). The extension rod (14) passes through the piston (4) and a rubber pad (15) is provided at the end away from the piston rod (3). The end of the extension rod (14) away from the piston rod (3) and the rubber pad (15) are both movably disposed in the cylinder (1) and the groove (6).

2. A hydraulic cylinder for preventing piston impact according to claim 1, characterized in that: The cylinder body (1) has a first connecting hole (16) at the end away from the end cap (2).

3. A hydraulic cylinder for preventing piston impact according to claim 1, characterized in that: The piston rod (3) is provided with a connector (17) at the end away from the piston (4), and the connector (17) is provided with a second connecting hole (18).

4. A hydraulic cylinder for preventing piston impact according to claim 1, characterized in that: The cylinder body (1) located at the outer end of the first oil passage (7) and the end cover (2) located at the outer end of the second oil passage (8) are both bolted with cover plates (19).

5. A hydraulic cylinder for preventing piston impact according to claim 1, characterized in that: The piston (4) has several third annular grooves (20) on its outer surface and along the circumferential direction, and the third annular grooves (20) are provided with rubber rings (21).

6. A hydraulic cylinder for preventing piston impact according to claim 1, characterized in that: Several fourth annular grooves (22) are also provided on the inner wall of the central hole (5) of the end cap (2), and sealing filler (23) is provided in the fourth annular grooves (22).

Images