Sealing structure of hydraulic oil cylinder

Abstract

The utility model relates to the technical field of oil cylinder sealing, in particular to a sealing structure of a hydraulic oil cylinder, which comprises a cylinder body, the inner bottom surface of the cylinder body is in threaded connection with a cushion collar, the upper end of the cylinder body is in threaded connection with an oil cylinder cover, the inside of the cylinder body is movably connected with a hydraulic rod, and the outer surface of the hydraulic rod is in nested connection with an oil cylinder piston. According to the utility model, the first sealing sleeve and the second sealing sleeve are provided with the sealing rings through the limiting grooves, so that the hydraulic rod is in contact with the sealing rings when stretching out and drawing back, and the contact position of the hydraulic rod and the oil cylinder cover is sealed through the sealing rings; and hydraulic oil is prevented from flowing out of the contact position of the hydraulic rod and the oil cylinder cover, the mounting sleeve is dismounted, then the hydraulic rod is manually pulled, the first sealing sleeve and the second sealing sleeve are taken out through the hydraulic rod, the first sealing sleeve and the second sealing sleeve are connected in a clamped mode through the clamping protrusions, and therefore the sealing ring embedded in the sealing piece can be replaced conveniently.

Description

Technical Field

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

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. Since it has no transmission gap and operates smoothly, it is widely used in the hydraulic systems of various machines. The long-term reciprocating motion of the hydraulic cylinder easily causes wear of the sealing structure such as the sealing ring at the piston rod. However, the devices in the prior art have certain disadvantages when used. For example, the announcement No. CN220566353U describes a sealing structure for a hydraulic support cylinder, which relates to the technical field of hydraulic cylinders. The present invention includes a cylinder body, a piston rod is provided at the top of the cylinder body, and a symmetrically distributed protective cover is provided on the outer movable sleeve of the cylinder body. The top of the protective cover is sleeved on the outer side of the piston rod, one side of the protective cover is hinged to each other, and the other side of the protective cover is provided with a through groove.

[0003] The above-mentioned device uses a protective cover to protect the extended section of the piston rod to prevent particles such as tiny dust and sand from entering the interior of the cylinder body, further improving the service life of the hydraulic cylinder. However, the contact point between the cylinder head and the hydraulic rod is prone to oil leakage, and some contact points between the cylinder head and the hydraulic rod require embedded sealing rings. Such embedded sealing rings are inconvenient to replace due to their position, and are not convenient for subsequent maintenance. Utility Model Content

[0004] The purpose of the present utility model is to provide a sealing structure for a hydraulic cylinder to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A sealing structure of a hydraulic cylinder includes a cylinder body, an inner bottom surface of the cylinder body being threadedly connected to a buffer sleeve, an upper end of the cylinder body being threadedly connected to a cylinder cover, a hydraulic rod being movably connected inside the cylinder body, an outer surface of the hydraulic rod being nestedly connected to a cylinder piston, an upper surface of the cylinder cover being embeddedly connected to a first sealing sleeve, a side surface of the first sealing sleeve being snap-connected to a second sealing sleeve, an outer surface of the cylinder body being nestedly connected to a mounting sleeve, and a lower surface of the mounting sleeve being threadedly connected to an extrusion bolt.

[0007] Furthermore, a buffer spring is placed inside the buffer sleeve, a buffer column is embedded in the upper end of the buffer sleeve and movably connected, a damping piston is nested and connected at the lower end of the buffer column, and the damping piston is in contact with the buffer spring.

[0008] Furthermore, the lower end of the hydraulic rod is fixedly connected with a threaded column, the outer surface of the threaded column is threadedly connected with a nut, and a contact pad is placed between the oil cylinder piston and the nut.

[0009] Furthermore, the inner walls of the first sealing sleeve and the second sealing sleeve are both provided with limiting grooves, the interior of the limiting grooves is clamped with sealing rings, the hydraulic rod and the sealing ring are slidably connected, sealing gaskets are placed on the upper and lower ends of the first sealing sleeve and the second sealing sleeve, the side surface of the second sealing sleeve is fixedly connected with a clamping protrusion, and the second sealing sleeve is clamped and connected to the first sealing sleeve via the clamping protrusion.

[0010] Furthermore, a contact ring is provided on the inner top surface of the installation sleeve, and the contact ring contacts the sealing gasket located at the upper end of the first sealing sleeve.

[0011] Furthermore, a limiting hole is provided on the outer surface of the mounting sleeve, a mounting seat is nested and connected at the lower end of the mounting sleeve, a bolt is threadedly connected to the outer surface of the mounting seat, and the end of the bolt is inserted into the limiting hole.

[0012] Preferably, a groove is provided on the upper surface of the mounting seat, and the mounting seat is nested and connected with the mounting sleeve through the groove.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] When the end of the hydraulic rod contacts the buffer column, the buffer column moves downward, causing the damping piston to squeeze the buffer spring. The damping piston prevents the buffer spring from continuously shaking, thereby absorbing the force applied by the hydraulic rod and preventing the bottom of the cylinder from being damaged by force and causing oil leakage.

[0015] The first sealing sleeve and the second sealing sleeve are provided with sealing rings through the limiting grooves, so that the hydraulic rod contacts the sealing rings when extending and retracting, and the contact position between the hydraulic rod and the cylinder cover is sealed by the sealing rings to prevent the hydraulic oil from flowing out from the contact position between the hydraulic rod and the cylinder cover;

[0016] When replacing the sealing ring and the sealing gasket, rotate the extrusion bolt to separate one end of the extrusion bolt from the cylinder body, so that the contact ring and the first sealing sleeve and the sealing gasket on the upper surface of the second sealing sleeve can be separated. In addition, rotate the bolt so that one end of the bolt is separated from the mounting sleeve under the push of the thread, so that the lower end of the mounting sleeve loses external fixation, and the mounting sleeve is removed. Then, manually pull the hydraulic rod to bring out the first sealing sleeve and the second sealing sleeve through the hydraulic rod, and the first sealing sleeve and the second sealing sleeve are clamped by the clamping protrusion, which is convenient for replacing the sealing ring embedded in the sealing member. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall schematic diagram of the utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the cylinder body of the present utility model;

[0019] Figure 3 This is a schematic diagram of the split structure of the utility model;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the installation sleeve of the utility model.

[0021] In the figure: 1. Cylinder body; 101. Buffer sleeve; 102. Buffer spring; 103. Buffer column; 104. Damping piston; 2. Hydraulic rod; 201. Threaded column; 202. Cylinder piston; 204. Contact pad; 205. Nut; 3. Cylinder head; 4. First sealing sleeve; 401. Limiting groove; 402. Second sealing sleeve; 403. Snap-fit ​​protrusion; 404. Sealing ring; 405. Sealing pad; 5. Mounting sleeve; 501. Contact ring; 502. Limiting hole; 503. Mounting seat; 504. Groove; 505. Bolt; 506. Extrusion bolt. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figures 1 to 4 In an embodiment of the present invention, a sealing structure of a hydraulic cylinder includes a cylinder body 1, the inner bottom surface of the cylinder body 1 is threadedly connected to a buffer sleeve 101, the upper end of the cylinder body 1 is threadedly connected to a cylinder cover 3, the interior of the cylinder body 1 is movably connected to a hydraulic rod 2, the outer surface of the hydraulic rod 2 is nested and connected to a cylinder piston 202, the upper surface of the cylinder cover 3 is embedded and connected to a first sealing sleeve 4, one side surface of the first sealing sleeve 4 is snap-connected to a second sealing sleeve 402, the outer surface of the cylinder body 1 is nested and connected to a mounting sleeve 5, and the lower surface of the mounting sleeve 5 is threadedly connected to an extrusion bolt 506.

[0024] Specifically, when in use, the cylinder piston 202 is used to separate the internal space of the cylinder body 1, and the buffer sleeve 101 is used to buffer the hydraulic rod 2 to prevent the bottom end of the hydraulic rod 2 from hitting the bottom of the cylinder body 1 and preventing damage to the cylinder body 1. The first sealing sleeve 4 and the second sealing sleeve 402 seal the contact position between the cylinder cover 3 and the hydraulic rod 2 to avoid oil leakage at the connection position, and the mounting sleeve 5 protects the cylinder body 1 to increase the strength of the cylinder body 1. When removing the first sealing sleeve 4 and the second sealing sleeve 402, the mounting sleeve 5 is removed, so that the mounting sleeve 5 loses its fixation on the first sealing sleeve 4 and the second sealing sleeve 402, which facilitates maintenance of the first sealing sleeve 4 and the second sealing sleeve 402.

[0025] Example 1

[0026] like Figure 1-3 As shown, a buffer spring 102 is placed inside the buffer sleeve 101, the upper end of the buffer sleeve 101 is embedded with a buffer column 103 and is movably connected, the lower end of the buffer column 103 is nested and connected with a damping piston 104, the damping piston 104 is in contact with the buffer spring 102, the lower end of the hydraulic rod 2 is fixedly connected with a threaded column 201, the outer surface of the threaded column 201 is threadedly connected with a nut 205, and a contact pad 204 is placed between the cylinder piston 202 and the nut 205.

[0027] In this embodiment, when the end of the hydraulic rod 2 contacts the buffer column 103, the buffer column 103 moves downward, causing the damping piston 104 to squeeze the buffer spring 102. The damping piston 104 prevents the buffer spring 102 from continuously shaking, thereby absorbing the force applied by the hydraulic rod 2 and preventing the bottom of the cylinder body 1 from being damaged by force and causing oil leakage.

[0028] Example 2

[0029] On the basis of the first embodiment, in order to make up for the problem that it is inconvenient to replace the sealing ring 404 in the first embodiment.

[0030] like Figure 1-4 As shown, the inner walls of the first sealing sleeve 4 and the second sealing sleeve 402 are both provided with a limiting groove 401, and a sealing ring 404 is clamped inside the limiting groove 401. The hydraulic rod 2 and the sealing ring 404 are slidably connected. Sealing gaskets 405 are placed on the upper and lower ends of the first sealing sleeve 4 and the second sealing sleeve 402. The side surface of the second sealing sleeve 402 is fixedly connected with a clamping protrusion 403. The second sealing sleeve 402 is clamped and connected to the first sealing sleeve 4 through the clamping protrusion 403. A contact ring 501 is provided on the inner top surface of the mounting sleeve 5, and the contact ring 501 is in contact with the sealing gasket 405 located at the upper end of the first sealing sleeve 4.

[0031] In this embodiment, when in use, the first sealing sleeve 4 and the second sealing sleeve 402 are installed with the sealing ring 404 through the limiting groove 401, so that the hydraulic rod 2 contacts the sealing ring 404 when extending and retracting, and the contact position between the hydraulic rod 2 and the cylinder cover 3 is sealed by the sealing ring 404 to prevent the hydraulic oil from flowing out from the contact position between the hydraulic rod 2 and the cylinder cover 3.

[0032] like Figure 1-4 As shown, a limiting hole 502 is provided on the outer surface of the mounting sleeve 5, and a mounting seat 503 is nested and connected at the lower end of the mounting sleeve 5. A bolt 505 is threadedly connected to the outer surface of the mounting seat 503, and the end of the bolt 505 is inserted into the limiting hole 502. A groove 504 is provided on the upper surface of the mounting seat 503, and the mounting seat 503 is nested and connected to the mounting sleeve 5 through the groove 504.

[0033] In this embodiment, when replacing the sealing ring 404 and the sealing gasket 405, the extrusion bolt 506 is rotated to separate one end of the extrusion bolt 506 from the cylinder body 1, so that the contact ring 501 and the first sealing sleeve 4 and the sealing gasket 405 on the upper surface of the second sealing sleeve 402 can be separated. In addition, the bolt 505 is rotated to separate one end of the bolt 505 from the mounting sleeve 5 under the push of the thread, so that the lower end of the mounting sleeve 5 loses external fixation, the mounting sleeve 5 is removed, and then the hydraulic rod 2 is manually pulled to bring out the first sealing sleeve 4 and the second sealing sleeve 402 through the hydraulic rod 2, and the first sealing sleeve 4 and the second sealing sleeve 402 are clamped by the clamping protrusion 403, which facilitates the replacement of the sealing ring embedded in the sealing component.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0035] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A sealing structure for a hydraulic cylinder, comprising a cylinder body (1), characterized in that: The inner bottom surface of the cylinder body (1) is threadedly connected to a buffer sleeve (101), the upper end of the cylinder body (1) is threadedly connected to a cylinder cover (3), the interior of the cylinder body (1) is movably connected to a hydraulic rod (2), the outer surface of the hydraulic rod (2) is nestedly connected to a cylinder piston (202), the upper surface of the cylinder cover (3) is embeddedly connected to a first sealing sleeve (4), one side surface of the first sealing sleeve (4) is snap-connected to a second sealing sleeve (402), the outer surface of the cylinder body (1) is nestedly connected to a mounting sleeve (5), and the lower surface of the mounting sleeve (5) is threadedly connected to an extrusion bolt (506).

2. The sealing structure of a hydraulic cylinder according to claim 1, characterized in that: A buffer spring (102) is placed inside the buffer sleeve (101), the upper end of the buffer sleeve (101) is embedded with a buffer column (103) for active connection, the lower end of the buffer column (103) is nested with a damping piston (104), and the damping piston (104) is in contact with the buffer spring (102).

3. The sealing structure of a hydraulic cylinder according to claim 1, characterized in that: The lower end of the hydraulic rod (2) is fixedly connected to a threaded column (201), the outer surface of the threaded column (201) is threadedly connected to a nut (205), and a contact pad (204) is placed between the oil cylinder piston (202) and the nut (205).

4. The sealing structure of a hydraulic cylinder according to claim 1, characterized in that: The inner walls of the first sealing sleeve (4) and the second sealing sleeve (402) are both provided with a limiting groove (401), a sealing ring (404) is clamped inside the limiting groove (401), the hydraulic rod (2) and the sealing ring (404) are slidably connected, a sealing gasket (405) is placed on the upper end and the lower end of the first sealing sleeve (4) and the second sealing sleeve (402), a clamping protrusion (403) is fixedly connected to the side surface of the second sealing sleeve (402), and the second sealing sleeve (402) is clamped and connected to the first sealing sleeve (4) through the clamping protrusion (403).

5. The sealing structure of a hydraulic cylinder according to claim 1, characterized in that: A contact ring (501) is provided on the inner top surface of the mounting sleeve (5), and the contact ring (501) contacts the sealing gasket (405) located at the upper end of the first sealing sleeve (4).

6. The sealing structure of a hydraulic cylinder according to claim 1, characterized in that: The outer surface of the mounting sleeve (5) is provided with a limiting hole (502), the lower end of the mounting sleeve (5) is nested and connected with a mounting seat (503), the outer surface of the mounting seat (503) is threadedly connected with a bolt (505), and the end of the bolt (505) is inserted into the limiting hole (502).

7. The sealing structure of a hydraulic cylinder according to claim 6, characterized in that: A groove (504) is provided on the upper surface of the mounting seat (503), and the mounting seat (503) is nested and connected with the mounting sleeve (5) through the groove (504).

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