Sealing structure of hydraulic cylinder

Abstract

The utility model provides a sealing structure of a hydraulic cylinder, which relates to the technical field of hydraulic cylinders and comprises a hydraulic cylinder body, limiting rings are arranged at the positions, close to the top edge and the bottom edge, in the hydraulic cylinder body, a connecting rod is arranged in the hydraulic cylinder body, and pistons are fixed at the two ends of the connecting rod. According to the hydraulic cylinder, in the hydraulic cylinder body, when the pistons slide to the edge of one end of the hydraulic cylinder body, the sealing rings can be clamped in the annular grooves firstly, the pistons can have certain penetrating impact force under high pressure, and therefore the hydraulic cylinder body can be driven to rotate; when the piston rotates, the impact force extrudes the sealing ring towards the interior of the gap between the connecting disc and the piston, meanwhile, the telescopic rod shrinks, so that the gap between the connecting disc and the piston becomes small, the sliding ring is extruded, the spring is compressed, the spring generates reverse acting force during compression, and therefore the inertia impact force of the piston is counteracted, and the buffering effect is achieved.

Description

Technical Field

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

[0002] At present, in the field of hydraulic transmission technology, the hydraulic cylinder, as an important component of the hydraulic transmission system, has two main sealing structures. One is to use a lip seal ring structure as the main structural form; the other is to use a combined seal ring or a composite lip seal ring as the sealing structure form. In actual use, these two sealing structure forms have different limitations.

[0003] Moreover, when the hydraulic cylinder is extended and retracted to the maximum stroke under high pressure, the sealing element at the piston collides with the end of the hydraulic cylinder. The sealing element is in direct rigid contact with the end, which can easily cause damage to the sealing element under long-term use and affect the sealing of the hydraulic cylinder. Utility Model Content

[0004] In order to solve the existing technical problems, the utility model provides a sealing structure of a hydraulic cylinder. In order to solve the above technical problems, the basic concept of the technical solution adopted by the utility model is:

[0005] A sealing structure of a hydraulic cylinder comprises a hydraulic cylinder body, wherein limit rings are arranged inside the hydraulic cylinder body near the top and bottom edges, a connecting rod is arranged inside the hydraulic cylinder body, pistons are fixed at both ends of the connecting rod, telescopic rods are fixed to the tops of the two pistons, one ends of the two telescopic rods are fixed to connecting plates, push rods are fixed to the tops of the two connecting plates, and one ends of the two push rods slide through to the outside of the hydraulic cylinder body.

[0006] Optionally, the piston and the connecting plate at one end of the connecting rod are a group, a gap is left between the opposite sides of each group of the piston and the connecting plate, and guide grooves are provided on the inner walls on both sides of the hydraulic cylinder body.

[0007] Optionally, a sliding ring is slidably provided on the outer surface of the telescopic rod, a spring is fixed on the top of the sliding ring, and both sides of the piston are correspondingly slidably engaged in the guide groove.

[0008] Optionally, one end of the spring is fixed on the outer surface of the piston, and a contact ring is provided at the edge of the outer surface of the sliding ring.

[0009] Optionally, a sealing ring is provided at the gap between the piston and the outer surface of the connecting disk, and the outer surface of the sealing ring extends to the outer surface of the contact ring.

[0010] Optionally, an annular groove is formed on the outer surface of the limiting ring, and the sealing ring is engaged in the annular groove.

[0011] Optionally, a first pipe is connected to the outer surface of the hydraulic cylinder body near the top edge, and a second pipe is connected to the outer surface of the hydraulic cylinder body near the bottom edge.

[0012] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art. Of course, any product implementing the utility model does not necessarily need to achieve all the advantages described below at the same time:

[0013] 1. In the utility model, inside the hydraulic cylinder body, when the piston slides to the edge of one end of the hydraulic cylinder body, the sealing ring will first be engaged in the annular groove, and the piston will have a certain penetrating impact force under high pressure, and the impact force will squeeze the sealing ring into the gap between the connecting plate and the piston. At the same time, the telescopic rod will shrink, so that the gap between the connecting plate and the piston becomes smaller. At this time, the sliding ring will also be squeezed, so that the spring is compressed. The spring will generate a reverse force when compressed, thereby offsetting the inertial impact force of the piston and playing a buffering role.

[0014] 2. In the utility model, after the inertial impact force on the piston is offset, the sliding ring will be reset under the elastic force of the spring, and at the same time, reverse hydraulic oil is injected from the pipeline into the hydraulic cylinder to push the piston to reciprocate. In actual use, the sealing ring and the limit ring are made of high-strength rubber to improve their sealing performance, and the outer surface of the piston is extended to the inside of the guide groove, so that the piston is more stable when sliding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] In the figure:

[0017] Figure 1 This is a schematic diagram of the main three-dimensional structure of a sealing structure of a hydraulic cylinder proposed by the utility model;

[0018] Figure 2 The utility model provides a cross-sectional three-dimensional structural schematic diagram of a sealing structure of a hydraulic cylinder;

[0019] Figure 3 For this utility model Figure 2 Magnified view at A in the middle.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0021] 1. Hydraulic cylinder body; 2. First pipeline; 3. Second pipeline; 4. Push rod; 5. Connecting rod; 6. Guide groove; 7. Limiting ring; 8. Piston; 9. Annular groove; 10. Telescopic rod; 11. Connecting plate; 12. Sealing ring; 13. Spring; 14. Sliding ring; 15. Contact ring.

[0022] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0023] The utility model will now be further described in detail with reference to the accompanying drawings.

[0024] Embodiment 1, as Figure 1-3 As shown, the utility model provides a technical solution for the sealing structure of a hydraulic cylinder: it includes a hydraulic cylinder body 1, wherein limit rings 7 are arranged near the top and bottom edges of the hydraulic cylinder body 1, a connecting rod 5 is arranged inside the hydraulic cylinder body 1, pistons 8 are fixed at both ends of the connecting rod 5, telescopic rods 10 are fixed on the tops of the two pistons 8, one ends of the two telescopic rods 10 are fixed with connecting plates 11, the tops of the two connecting plates 11 are fixed with push rods 4, and one ends of the two push rods 4 slide through the outside of the hydraulic cylinder body 1.

[0025] The effect achieved by the entire embodiment 1 is that, inside the hydraulic cylinder body 1, when the piston 8 slides to the edge of one end of the hydraulic cylinder body 1, the sealing ring 12 will first be engaged in the annular groove 9, and the piston 8 will have a certain penetrating impact force under high pressure, and the impact force will squeeze the sealing ring 12 into the gap between the connecting plate 11 and the piston 8. At the same time, the telescopic rod 10 will shrink, so that the gap between the connecting plate 11 and the piston 8 becomes smaller. At this time, the sliding ring 14 will also be squeezed, so that the spring 13 is compressed. The spring 13 will generate a reverse force when compressed, thereby offsetting the inertial impact force of the piston 8 and playing a buffering role.

[0026] Embodiment 2, as Figure 1-3As shown, the piston 8 and the connecting plate 11 located at one end of the connecting rod 5 are a group, and a gap is left between the opposite sides of each group of pistons 8 and connecting plates 11. Guide grooves 6 are provided on the inner walls of both sides of the hydraulic cylinder body 1. A sliding ring 14 is slidably provided on the outer surface of the telescopic rod 10, and a spring 13 is fixed on the top of the sliding ring 14. Both sides of the piston 8 are correspondingly slidably engaged in the guide groove 6. One end of the spring 13 is fixed on the outer surface of the piston 8. A contact ring 15 is provided at the edge of the outer surface of the sliding ring 14. A sealing ring 12 is provided in the gap between the outer surface of the piston 8 and the connecting plate 11, and the outer surface of the sealing ring 12 extends to the outer surface of the contact ring 15. An annular groove 9 is provided on the outer surface of the limit ring 7, and the sealing ring 12 is engaged in the annular groove 9. The outer surface of the hydraulic cylinder body 1 is connected to a first pipe 2 near the top edge, and the outer surface of the hydraulic cylinder body 1 is connected to a second pipe 3 near the bottom edge.

[0027] The effect achieved by the entire embodiment 2 is that after the inertial impact force on the piston 8 is offset, the sliding ring 14 will be reset under the elastic force of the spring 13, and at the same time, the reverse hydraulic oil is injected from the pipeline into the hydraulic cylinder body 1 to push the piston 8 to reciprocate. In actual use, the sealing ring 12 and the limit ring 7 are made of high-strength rubber to improve their sealing performance, and the outer surface of the piston 8 is extended to the inside of the guide groove 6, so that the piston 8 is more stable when sliding.

[0028] Working principle: Inside the hydraulic cylinder body 1, when the piston 8 slides to the edge of one end of the hydraulic cylinder body 1, the sealing ring 12 will first be engaged in the annular groove 9. The piston 8 will have a certain penetrating impact force under high pressure, and the impact force will squeeze the sealing ring 12 into the gap between the connecting plate 11 and the piston 8. At the same time, the telescopic rod 10 will shrink, so that the gap between the connecting plate 11 and the piston 8 becomes smaller. At this time, the sliding ring 14 will also be squeezed, causing the spring 13 to be compressed. The spring 13 will generate a reverse force when compressed, thereby offsetting the inertial impact force of the piston 8 and playing a buffering role. After the inertial impact force on the piston 8 is offset, the sliding ring 14 will be reset under the elastic force of the spring 13, and at the same time, the reverse hydraulic oil will be injected from the pipeline into the hydraulic cylinder body 1 to push the piston 8 to reciprocate. In actual use, the sealing ring 12 and the limit ring 7 are made of high-strength rubber to improve their sealing performance, and the outer surface of the piston 8 is extended to the inside of the guide groove 6, so that the piston 8 is more stable when sliding.

[0029] The present invention is not limited to the above-mentioned implementation modes. Anyone should be aware of the structural changes made under the inspiration of the present invention. Any technical solution that is the same or similar to the present invention falls within the protection scope of the present invention. The technology, shape, and structure that are not described in detail in the present invention are all known technologies.

Claims

1. A sealing structure of a hydraulic cylinder, comprising a hydraulic cylinder body (1), characterized in that: Limiting rings (7) are provided inside the hydraulic cylinder body (1) near the top and bottom edges, and a connecting rod (5) is provided inside the hydraulic cylinder body (1). Pistons (8) are fixed at both ends of the connecting rod (5), telescopic rods (10) are fixed on the tops of the two pistons (8), one ends of the two telescopic rods (10) are fixed with connecting plates (11), and push rods (4) are fixed on the tops of the two connecting plates (11), and one ends of the two push rods (4) slide through the outside of the hydraulic cylinder body (1).

2. The sealing structure of a hydraulic cylinder according to claim 1, characterized in that: The piston (8) and the connecting plate (11) located at one end of the connecting rod (5) form a group, and a gap is left between the opposite sides of each group of the piston (8) and the connecting plate (11). The inner walls on both sides of the hydraulic cylinder body (1) are provided with guide grooves (6).

3. The sealing structure of a hydraulic cylinder according to claim 2, characterized in that: A sliding ring (14) is slidably provided on the outer surface of the telescopic rod (10), a spring (13) is fixed on the top of the sliding ring (14), and both sides of the piston (8) are correspondingly slidably engaged in the guide groove (6).

4. A sealing structure for a hydraulic cylinder according to claim 3, characterized in that: One end of the spring (13) is fixed on the outer surface of the piston (8), and a contact ring (15) is provided at the edge of the outer surface of the sliding ring (14).

5. The sealing structure of a hydraulic cylinder according to claim 4, characterized in that: A sealing ring (12) is provided at the gap between the piston (8) and the outer surface of the connecting plate (11), and the outer surface of the sealing ring (12) extends to the outer surface of the contact ring (15).

6. The sealing structure of a hydraulic cylinder according to claim 5, characterized in that: An annular groove (9) is formed on the outer surface of the limiting ring (7), and the sealing ring (12) is engaged inside the annular groove (9).

7. The sealing structure of a hydraulic cylinder according to claim 1, characterized in that: The outer surface of the hydraulic cylinder body (1) is connected to a first pipe (2) near the top edge, and the outer surface of the hydraulic cylinder body (1) is connected to a second pipe (3) near the bottom edge.

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