Sealed hydraulic oil cylinder

Abstract

The utility model relates to the technical field of hydraulic oil cylinders, in particular to a sealed hydraulic oil cylinder which is characterized in that a dustproof cover is fixedly connected to the upper surface of a cylinder cover, a fourth notch is formed in the outer surface of the cylinder cover, a first notch is formed in the upper side of the inner surface of an opening of the cylinder cover, a second notch is formed in the lower side of the inner surface of the opening of the cylinder cover, and a third notch is formed in the lower surface of the cylinder cover; the upper surface of the piston is fixedly connected with the piston rod. A limiting notch is formed in the outer surface of the middle of the piston. The upper surface of the bottom in the cylinder body is fixedly connected with a cushion; the hydraulic cylinder has the beneficial effects that the second sealing ring can effectively prevent hydraulic oil from permeating from the connecting position of the cylinder cover and the cylinder body, the sealing performance is improved, the sealing gasket can prevent the hydraulic oil from permeating from the position between the cylinder cover and the piston rod, and the sealing performance is improved; the buffer plate moves upwards to relieve impact of the piston on the cylinder body under cooperation of the spring, the limiting rod and the third notch, leakage of the hydraulic oil cylinder caused by looseness of the sealing structure is avoided, and the service life of equipment is prolonged.

Description

Technical Field

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

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating 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 movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] In the prior art, a hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device and other structures.

[0004] However, the existing hydraulic cylinders have the problem of poor sealing. With long-term use, different degrees of wear will occur between the piston and the cylinder body. Due to the lack of a buffer mechanism, the collision between the piston and the cylinder body will reduce the sealing of the hydraulic cylinder and may cause oil leakage, thereby shortening the service life of the hydraulic cylinder. Utility Model Content

[0005] The purpose of the utility model is to provide a sealed hydraulic cylinder to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a sealed hydraulic oil cylinder, the sealed hydraulic oil cylinder comprising: a cylinder head, a dust cover is fixedly connected to the upper surface of the cylinder head, a fourth notch is provided on the outer surface of the cylinder head, a first notch is provided on the upper side of the inner surface of the cylinder head opening, a second notch is provided on the lower side of the inner surface of the cylinder head opening, and a third notch is provided on the lower surface of the cylinder head;

[0007] The piston, the upper surface of the piston is fixedly connected to the piston rod, the outer surfaces of both ends of the piston are provided with positioning notches, and the outer surface of the middle part of the piston is provided with a limiting notch;

[0008] The cylinder body has an oil port fixedly connected to the inner surface of the cylinder body, and a buffer pad fixedly connected to the upper surface of the bottom of the cylinder body.

[0009] Preferably, the fourth notch is an annular plate structure, and the second sealing ring can be inserted into the fourth notch.

[0010] Preferably, the inner diameter of the third slot is equal to the diameter of the limit block, and the diameter at the opening of the third slot is smaller than the diameter of the limit block. The third slot can limit the limit block from falling off. The lower surface of the limit block is fixedly connected to the upper surface of the limit rod, and the lower surface of the limit rod is fixedly connected to the buffer plate. The limit rod is sleeved with a spring, the upper end of the spring is connected to the cylinder head, and the lower end of the spring is connected to the buffer plate.

[0011] Preferably, the first notch is an annular plate-shaped structure, and the dustproof pad can be inserted into the first notch, and the dustproof pad is a "T"-shaped ring-shaped structure.

[0012] Preferably, the second notch is an annular plate-shaped structure, and the sealing gasket can be inserted into the second notch.

[0013] Preferably, the limiting notch is a "T"-shaped annular notch, the first sealing ring can be inserted into the limiting notch, and the first sealing ring is an "I"-shaped ring structure.

[0014] Preferably, the positioning notch is an annular plate structure, and the positioning notch can assist in installing the wear-resistant ring to prevent the wear-resistant ring from falling off the piston.

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

[0016] The utility model provides a sealed hydraulic cylinder. First, a first sealing ring is inserted into a limiting groove. This setting can effectively prevent the hydraulic oil in two different chambers of the hydraulic cylinder from penetrating each other, thereby improving the hydraulic effect. The piston is installed in the cylinder body. Then, a second sealing ring is installed on the cylinder head along the fourth groove. The second sealing ring can effectively prevent the hydraulic oil from penetrating from the connection between the cylinder head and the cylinder body, thereby improving the sealing performance. Then, a sealing gasket is installed on the cylinder head to ensure that the sealing gasket is inserted into the second groove. The sealing gasket can prevent the hydraulic oil from penetrating from between the cylinder head and the piston rod, thereby improving the sealing performance. The cooperation of the second groove and the cylinder head can fix the sealing gasket, thereby improving the sealing effect of the hydraulic cylinder. The dust cover and the dustproof cover are connected. The cushion can effectively prevent particles such as sand and dust from entering the cylinder head, avoid wear of the piston, reduce the risk of hydraulic cylinder contamination, and improve the sealing of the hydraulic cylinder. A wear-resistant ring is arranged on the piston to prevent the piston from wearing the cylinder body when the piston moves up and down, which leads to a decrease in the sealing of the hydraulic cylinder. A cushion is arranged under the cylinder body and a cushion plate is arranged above the cylinder body. The cushion located at the bottom of the cylinder body can cushion the rigid impact of the piston on the bottom of the cylinder body. When the piston squeezes the cushion plate, the spring is deformed. With the cooperation of the spring, the limit rod and the third notch, the cushion plate moves upward to relieve the impact of the piston on the cylinder body, avoid loosening of the sealing structure and cause leakage of the hydraulic cylinder, and extend the service life of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the front view of the structure of the utility model;

[0019] Figure 3 This is a front view cross-sectional schematic diagram of the structure of the utility model;

[0020] Figure 4 for Figure 3 The enlarged structural diagram at A in the middle;

[0021] Figure 5 for Figure 3 The enlarged structural diagram at B in the middle;

[0022] Figure 6 for Figure 3 Enlarged structural diagram at point C in the middle.

[0023] In the figure: 1. cylinder head; 2. piston; 3. dust cover; 4. dust pad; 5. first notch; 6. sealing pad; 7. second notch; 8. third notch; 9. limit block; 10. limit rod; 11. spring; 12. buffer plate; 13. cylinder body; 14. piston rod; 15. oil port; 16. buffer pad; 17. wear-resistant ring; 18. first sealing ring; 19. positioning notch; 20. limit notch; 21. second sealing ring; 22. fourth notch. DETAILED DESCRIPTION

[0024] In order to make the purpose and technical solution of the utility model clearly and completely described, and the advantages more clearly understood, the embodiments of the utility model are further described in detail in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are part of the embodiments of the utility model, not all of the embodiments, and are only used to explain the embodiments of the utility model, and are not used to limit the embodiments of 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.

[0025] Embodiment 1

[0026] See also Figure 1-Figure 6 The utility model provides a technical solution: a sealed hydraulic oil cylinder, the sealed hydraulic oil cylinder comprises: a cylinder head 1, a dust cover 3 is fixedly connected to the upper surface of the cylinder head 1, a fourth notch 22 is provided on the outer surface of the cylinder head 1, a first notch 5 is provided on the upper side of the inner surface of the opening of the cylinder head 1, a second notch 7 is provided on the lower side of the inner surface of the opening of the cylinder head 1, and a third notch 8 is provided on the lower surface of the cylinder head 1; a piston 2, the upper surface of the piston 2 is fixedly connected to the piston rod 14, positioning notches 19 are provided on the outer surfaces of both ends of the piston 2, and a limiting notch 20 is provided on the outer surface of the middle part of the piston 2; a cylinder body 13, an oil port 15 is fixedly connected to the outer surface of the cylinder body 13, and a buffer pad 16 is fixedly connected to the upper surface of the inner bottom of the cylinder body 13;

[0027] During specific use, first align the wear-resistant ring 17 with the positioning groove 19 and install it on the piston 2, then insert the first sealing ring 18 into the limiting groove 20, install the piston 2 into the cylinder body 13, install the second sealing ring 21 along the fourth groove 22 on the cylinder head 1, and then install the dust pad 4 on the cylinder head 1, ensuring that the dust pad 4 is inserted into the first groove 5, and then install the sealing gasket 6 on the cylinder head 1, ensuring that the sealing gasket 6 is inserted into the second groove 7, and finally, install the cylinder head 1 on the cylinder body 13 along the piston rod 14, and use bolts and nuts to thread the cylinder head 1 and the cylinder body 13.

[0028] Embodiment 2

[0029] On the basis of the first embodiment, in order to prevent the leakage of the hydraulic cylinder due to poor sealing, a second notch 7 is provided, the second notch 7 is an annular plate structure, the sealing gasket 6 can be inserted into the second notch 7, the limiting notch 20 is a "T"-shaped annular notch, the first sealing ring 18 can be inserted into the limiting notch 20, the first sealing ring 18 is an "I"-shaped ring structure, the fourth notch 22 is an annular plate structure, and the second sealing ring 21 can be inserted into the fourth notch 22;

[0030] During specific use, the first sealing ring 18 is inserted into the limiting groove 20. The setting of the first sealing ring 18 can prevent the hydraulic oil in the two different chambers of the hydraulic cylinder from penetrating each other, thereby increasing the hydraulic effect. The piston 2 is installed in the cylinder body 13, and the second sealing ring 21 is installed on the cylinder head 1 along the fourth groove 22. The second sealing ring 21 can effectively prevent the hydraulic oil from penetrating from the connection between the cylinder head 1 and the cylinder body 13, thereby increasing the sealing performance. Then, the sealing gasket 6 is installed on the cylinder head 1 to ensure that the sealing gasket 6 is inserted into the second groove 7. The sealing gasket 6 can prevent the hydraulic oil from penetrating from between the cylinder head 1 and the piston rod 14, thereby increasing the sealing performance. The cooperation of the second groove 7 and the cylinder head 1 can fix the sealing gasket 6 on the cylinder head 1 to prevent the sealing gasket 6 from falling off, thereby improving the sealing effect of the hydraulic cylinder.

[0031] Embodiment 3

[0032] On the basis of the second embodiment, in order to prevent the leakage of the hydraulic cylinder due to internal wear, the inner diameter of the third notch 8 is equal to the diameter of the limit block 9, the diameter of the opening of the third notch 8 is smaller than the diameter of the limit block 9, and the third notch 8 can limit the limit block 9 from falling off. The lower surface of the limit block 9 is fixedly connected to the upper surface of the limit rod 10, and the lower surface of the limit rod 10 is fixedly connected to the buffer plate 12. The limit rod 10 is sleeved with a spring 11, the upper end of the spring 11 is connected to the cylinder head 1, and the lower end of the spring 11 is connected to the buffer plate 12. The first notch 5 is an annular plate structure, and the dustproof pad 4 can be stuck in the first notch 5. The dustproof pad 4 is a "T"-shaped ring structure. The positioning notch 19 is an annular plate structure. The positioning notch 19 can assist in installing the wear-resistant ring 17 to prevent the wear-resistant ring 17 from falling off from the piston 2;

[0033] During specific use, the dust cover 3 and the dust pad 4 can effectively prevent fine particles such as sand and dust from entering the cylinder body 13 from the cylinder head 1, wearing the piston 2, resulting in a decrease in the sealing of the hydraulic cylinder, and polluting the hydraulic oil in the hydraulic cylinder, thereby causing the piston 2 to get stuck with the cylinder body 13 and reducing the service life of the hydraulic cylinder. A wear-resistant ring 17 is provided on the piston 2 to prevent the piston 2 from wearing the cylinder body 13 when the piston 2 moves up and down, thereby reducing the sealing of the hydraulic cylinder. A buffer pad 16 is provided at the bottom of the cylinder body 13, and a buffer plate 12 is provided above the cylinder body 13. When the piston 2 squeezes the buffer plate 12, the spring 11 is deformed, and the spring 11, the limit rod 10 and the third notch 8 cooperate with the lower buffer plate 12 to move upward to buffer the rigid impact of the piston 2 on the cylinder body 13, thereby avoiding the loosening of the sealing structure due to the rigid impact of the piston 2 on the cylinder body 13 and causing hydraulic cylinder leakage, thereby improving the service life of the hydraulic cylinder.

[0034] In actual use, first, insert the first sealing ring 18 into the limiting groove 20. This setting can effectively prevent the hydraulic oil in the two different chambers of the hydraulic cylinder from penetrating each other, thereby improving the hydraulic effect. Install the piston 2 into the cylinder body 13, and then install the second sealing ring 21 onto the cylinder head 1 along the fourth groove 22. This sealing ring can effectively prevent the hydraulic oil from penetrating from the connection between the cylinder head 1 and the cylinder body 13, thereby improving the sealing performance. Then install the sealing gasket 6 onto the cylinder head 1, and ensure that the sealing gasket 6 is inserted into the second groove 7. The sealing gasket 6 can prevent the hydraulic oil from penetrating from between the cylinder head 1 and the piston rod 14, thereby improving the sealing performance. The cooperation between the second groove 7 and the cylinder head 1 can fix the sealing gasket 6 and improve the sealing effect of the hydraulic cylinder. The dust cover 3 cooperates with the dust pad 4 to effectively prevent sand from penetrating. Dust and other particles enter the cylinder head 1, avoiding wear of the piston 2, reducing the risk of hydraulic cylinder contamination, and improving the sealing of the hydraulic cylinder. A wear-resistant ring 17 is provided on the piston 2 to avoid wear of the piston 2 on the cylinder body 13 when the piston 2 moves up and down, thereby reducing the sealing of the hydraulic cylinder. A buffer pad 16 is provided below the cylinder body 13 and a buffer plate 12 is provided above the cylinder body 13. The buffer pad 16 located at the bottom of the cylinder body 13 can buffer the rigid impact of the piston 2 on the bottom of the cylinder body 13. When the piston 2 squeezes the buffer plate 12, the spring 11 is deformed. With the cooperation of the spring 11, the limit rod 10 and the third notch 8, the buffer plate 12 moves upward to relieve the impact of the piston 2 on the cylinder body 13, avoid loosening of the sealing structure to cause leakage of the hydraulic cylinder, and extend the service life of the hydraulic cylinder.

[0035] 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 sealed hydraulic cylinder, characterized in that: The sealed hydraulic cylinder comprises: a cylinder head (1), a dust cover (3) is fixedly connected to the upper surface of the cylinder head (1), a fourth notch (22) is provided on the outer surface of the cylinder head (1), a first notch (5) is provided on the upper side of the inner surface of the opening of the cylinder head (1), a second notch (7) is provided on the lower side of the inner surface of the opening of the cylinder head (1), and a third notch (8) is provided on the lower surface of the cylinder head (1); A piston (2), the upper surface of the piston (2) being fixedly connected to the piston rod (14), the outer surfaces of both ends of the piston (2) being provided with positioning notches (19), and the outer surface of the middle portion of the piston (2) being provided with a limiting notch (20); The cylinder body (13) has an oil port (15) fixedly connected to the outer surface of the cylinder body (13), and a buffer pad (16) fixedly connected to the upper surface of the inner bottom of the cylinder body (13).

2. A sealed hydraulic cylinder according to claim 1, characterized in that: The fourth notch (22) is an annular plate-shaped structure, and the second sealing ring (21) can be inserted into the fourth notch (22).

3. A sealed hydraulic cylinder according to claim 1, characterized in that: The inner diameter of the third notch (8) is equal to the diameter of the limit block (9), and the diameter of the opening of the third notch (8) is smaller than the diameter of the limit block (9). The third notch (8) can prevent the limit block (9) from falling off. The lower surface of the limit block (9) is fixedly connected to the upper surface of the limit rod (10), and the lower surface of the limit rod (10) is fixedly connected to the buffer plate (12). The limit rod (10) is sleeved with a spring (11), the upper end of the spring (11) is connected to the cylinder cover (1), and the lower end of the spring (11) is connected to the buffer plate (12).

4. A sealed hydraulic cylinder according to claim 1, characterized in that: The first notch (5) is an annular plate-shaped structure, the dustproof pad (4) can be inserted into the first notch (5), and the dustproof pad (4) is a "T"-shaped ring-shaped structure.

5. The sealed hydraulic cylinder according to claim 1, characterized in that: The second notch (7) is an annular plate-shaped structure, and the sealing gasket (6) can be inserted into the second notch (7).

6. A sealed hydraulic cylinder according to claim 1, characterized in that: The limiting notch (20) is a "T"-shaped annular notch, the first sealing ring (18) can be inserted into the limiting notch (20), and the first sealing ring (18) is an "I"-shaped ring structure.

7. The sealed hydraulic cylinder according to claim 1, characterized in that: The positioning notch (19) is an annular plate-shaped structure, and the positioning notch (19) can assist in installing the wear-resistant ring (17) to prevent the wear-resistant ring (17) from falling off the piston (2).

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