CN112483503A

CN112483503A - Hydraulic cylinder

Info

Publication number: CN112483503A
Application number: CN201910859795.4A
Authority: CN
Inventors: 汪波; 易鑫; 李志军
Original assignee: HUNAN TELI HYDRAULIC CO Ltd
Current assignee: HUNAN TELI HYDRAULIC CO Ltd
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2021-03-12

Abstract

The invention relates to the field of hydraulic equipment, and discloses a hydraulic cylinder which comprises a cylinder body (1), a piston (2) and a rod body (3), wherein a first pressure relief hole (21) is formed in the outer peripheral surface, attached to the inner peripheral surface of the cylinder body (1), of the piston (2), and a first oil return pipeline (22) with a rod cavity, communicated with the first pressure relief hole (21) and the cylinder body (1) is arranged in the piston (2). Through above-mentioned technical scheme, pressure release hole and oil return pipeline can communicate the sealed of having between piston and cylinder body to have the pole chamber, carry out the pressure release to the sealed of between piston and cylinder body, realize cooling and blowdown to the effective seal of protection piston and cylinder body.

Description

Hydraulic cylinder

Technical Field

The present invention relates to hydraulic equipment, and in particular, to a hydraulic cylinder.

Background

The pneumatic cylinder includes parts such as cylinder body, the body of rod, piston, guide ring, wherein forms piston seal between piston and the cylinder body to form the pole between the body of rod and the guide ring and seal, in the use, because the reciprocating motion of piston and the body of rod, lead to piston seal and the sealed emergence of pole to damage, consequently, need provide a pneumatic cylinder in order to solve the problem of sealed easy damage.

Disclosure of Invention

The invention aims to provide a hydraulic cylinder to solve the problem that a seal between a piston and a cylinder body is easy to damage.

In order to achieve the above object, the present invention provides a hydraulic cylinder, including a cylinder body, a piston, and a rod body, wherein a first pressure relief hole is provided on an outer circumferential surface of the piston, which is attached to an inner circumferential surface of the cylinder body, and a first oil return line having a rod cavity and communicating with the first pressure relief hole and the cylinder body is provided in the piston.

Optionally, the outer circumferential surface of the piston is provided with a plurality of first pressure relief holes uniformly distributed along the circumferential direction.

Optionally, a first annular groove is formed in the outer circumferential surface of the piston, and a sealing structure is arranged in the first annular groove.

Optionally, the outer circumferential surface of the piston is provided with first annular grooves located on two sides of the first pressure relief hole in the axial direction.

Optionally, the hydraulic cylinder includes a cylinder bottom connected to the cylinder body, and the cylinder body is provided with a first oil port adjacent to the cylinder bottom and communicating with the rodless chamber.

Optionally, the hydraulic cylinder comprises a guide ring arranged in the cylinder body, the rod body penetrates through the guide ring, a second pressure relief hole is formed in the inner circumferential surface, attached to the outer circumferential surface of the rod body, of the guide ring, and a second oil return pipeline communicated with the second pressure relief hole and a rod cavity of the cylinder body is arranged in the guide ring.

Optionally, the inner circumferential surface of the guide ring is provided with a plurality of second pressure relief holes uniformly distributed along the circumferential direction.

Optionally, a second annular groove is formed in the inner circumferential surface of the guide ring, and a sealing structure is arranged in the second annular groove.

Optionally, the inner circumferential surface of the guide ring is provided with second annular grooves located on two axial sides of the second pressure relief hole.

Optionally, the cylinder body is provided with a second oil port adjacent to the guide ring and communicating with the rod chamber, and the hydraulic cylinder includes a port seat located on an outer circumferential surface of the cylinder body and an oil pipe in fluid communication with the port seat and the second oil port.

Through above-mentioned technical scheme, pressure release hole and oil return pipeline can communicate the sealed of having between piston and cylinder body to have the pole chamber, carry out the pressure release to the sealed of between piston and cylinder body, realize cooling and blowdown to the effective seal of protection piston and cylinder body.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a sectional view of a hydraulic cylinder according to an embodiment of the present invention.

Description of the reference numerals

1 cylinder and 2 piston

3 rod body 4 guide ring

5 oil pipe 6 interface seat

7 cylinder bottom

11 first oil port 12 second oil port

21 first pressure relief hole 22 first oil return line

23 first annular groove

41 second relief hole 42 second oil return line

43 second annular groove

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, the axial direction refers to the axial direction of the cylinder, piston, rod, guide ring, etc., and the circumferential direction refers to the circumferential direction of the cylinder, piston, rod, guide ring, etc.

The invention provides a hydraulic cylinder which comprises a cylinder body 1, a piston 2 and a rod body 3, wherein a first pressure relief hole 21 is formed in the outer peripheral surface, attached to the inner peripheral surface of the cylinder body 1, of the piston 2, and a first oil return pipeline 22 communicated with the first pressure relief hole 21 and a rod cavity of the cylinder body 1 is arranged in the piston 2.

The piston 2 is movable in the cylinder 1 in its axial direction, and divides the space inside the cylinder 1 into a rod chamber and a rodless chamber. The outer peripheral surface of the piston 2 is hermetically jointed with the inner peripheral surface of the cylinder 1, a first pressure relief hole 21 is formed on the outer peripheral surface, and the first pressure relief hole 21 is communicated with a rod cavity of the cylinder 1 through a first oil return pipeline 22 which is built in the piston 2. referring to fig. 1, the first pressure relief hole 21 and the first oil return pipeline 22 can be regarded as a radial channel and a channel which is parallel to the axial direction which are formed in the piston 2, so that the sealing on the outer peripheral surface of the piston 2 is communicated with the rod cavity, a hydraulic oil loop is formed, the sealing formed by the piston 2 and the cylinder 1 can be relieved, the temperature reduction and the pollution discharge are realized, and the sealing between the piston 2 and the cylinder 1 is protected.

Further, a plurality of first pressure relief holes 21 are uniformly distributed along the circumferential direction on the outer circumferential surface of the piston 2. The plurality of first pressure release holes 21 are uniformly spaced in the circumferential direction, and more uniform pressure release is achieved for sealing between the piston 2 and the cylinder 1. The plurality of first pressure release holes 21 are aligned in the axial direction on the piston 2, and there is substantially no misalignment.

In addition, a first annular groove 23 is provided on the outer peripheral surface of the piston 2, and a seal structure is provided in the first annular groove 23. First ring channel 23 staggers with first pressure release hole 21, and first pressure release hole 21 can realize cooling and blowdown to the sealed pressure release between seal structure in first ring channel 23 and cylinder body 1, protects this seal structure.

Further, the outer circumferential surface of the piston 2 is provided with the first annular grooves 23 located on both sides of the first pressure relief hole 21 in the axial direction. As shown in fig. 1, the first pressure release hole 21 is provided with first annular grooves 23 on both sides in the axial direction, and sealing structures are provided in the first annular grooves 23 on both sides to enhance the sealing between the first pressure release hole and the inner circumferential surface of the cylinder 1, and the first pressure release hole 21 can release the pressure on both sides to achieve cooling and pollution discharge.

Furthermore, the hydraulic cylinder comprises a cylinder bottom 7 connected to the cylinder body 1, the cylinder body 1 being provided with a first oil port 11 adjacent to the cylinder bottom 7 and communicating with the rodless chamber. One end of the cylinder body 1 allows the rod body 1 to be inserted, the other end of the cylinder body is provided with a cylinder bottom 7, a rodless cavity is formed between the piston 2 and the cylinder bottom 7, a first oil port 11 is formed in the position, close to the cylinder bottom 7, of the cylinder body 1, and hydraulic oil can be injected into the rodless cavity through the first oil port 11 so as to push the piston 2 to move.

In addition, the pneumatic cylinder is including setting up guide ring 4 in cylinder body 1, the body of rod 3 passes guide ring 4, guide ring 4 with be provided with second pressure release hole 41 on the inner peripheral surface of the outer peripheral face laminating of the body of rod 3, guide ring 4 embeds and communicates in second pressure release hole 41 with the second oil return line 42 that has the pole chamber of cylinder body 1. Referring to fig. 1, the guide ring 4 is located at one end of the rod body 3 inserted into the cylinder body 1, a seal is formed between the guide ring 4 and the rod body 3, a second pressure relief hole 41 is formed on the inner circumferential surface of the guide ring 4, and the second pressure relief hole 41 is communicated with the rod cavity through a second oil return pipeline 42 embedded in the guide ring 4. referring to fig. 1, the second pressure relief hole 41 and the second oil return pipeline 42 can be integrally regarded as a radial channel and a channel parallel to the axial direction formed in the guide ring, so that the seal at the outer circumferential surface of the rod body 3 is communicated with the rod cavity to form a hydraulic oil loop, a gap on the rod seal pressure side is increased in a proper amount, the seal formed by the rod body 3 and the guide ring 4 can be relieved, the seal is lubricated, cooling and pollution discharge are realized, and the seal between the rod body 3.

Further, the inner circumferential surface of the guide ring 4 is provided with a plurality of second pressure relief holes 41 uniformly distributed along the circumferential direction. The plurality of second pressure relief holes 41 are uniformly spaced in the circumferential direction, and more uniform pressure relief is achieved for sealing between the rod body 3 and the guide ring 4. The plurality of second pressure release holes 41 are aligned in the axial direction on the guide ring 4, and there is substantially no misalignment.

In addition, a second annular groove 43 is provided on the inner peripheral surface of the guide ring 4, and a seal structure is provided in the second annular groove 43. The second annular groove 43 is staggered with the second pressure relief hole 41, and the second pressure relief hole 41 can relieve the sealing pressure between the sealing structure in the second annular groove 43 and the rod body 3, so that the cooling and the pollution discharge are realized, and the sealing structure is protected.

Further, the inner circumferential surface of the guide ring 4 is provided with the second annular grooves 43 located at both axial sides of the second relief hole 41. As shown in fig. 1, the second pressure relief holes 41 are provided with second annular grooves 43 on both sides in the axial direction, and sealing structures are provided in the second annular grooves 43 on both sides to enhance the sealing between the outer circumferential surfaces of the rod body 3, and the second pressure relief holes 41 can relieve the sealing on both sides to reduce the temperature and discharge the sewage. The sealing structure can be a sealing ring, a sealing lip, a dustproof ring and other structures, can be used for improving the sealing between the guide ring 4 and the rod body 3, can prevent hydraulic oil in the rod cavity from leaking on the one hand, and can prevent external dust and other impurities from entering the interior of the cylinder body 1 on the other hand.

Furthermore, the cylinder block 1 is provided with a second oil port 12 adjacent to the guide ring 4 and communicating with the rod chamber, and the hydraulic cylinder includes a mouthpiece 6 on the outer circumferential surface of the cylinder block 1 and an oil pipe 5 in fluid communication with the mouthpiece 6 and the second oil port 12. Referring to fig. 1, the cylinder block 1 is provided with a second oil port 12 at a position adjacent to the guide ring 4, and hydraulic oil can be injected into the rod chamber through the second oil port 12 to push the piston 2 to move. The cylinder body 1 is further provided with a connector seat 6, a hydraulic oil pipeline is arranged in the connector seat 6, and a connector capable of being connected with a hydraulic oil supply device is arranged in the connector seat 6, the connector seat 6 is communicated with the second oil port 12 through an oil pipe 5, and therefore the hydraulic cylinder can be conveniently communicated with the hydraulic oil supply device through the connector seat 6.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. The hydraulic cylinder comprises a cylinder body (1), a piston (2) and a rod body (3), and is characterized in that a first pressure relief hole (21) is formed in the outer peripheral surface, attached to the inner peripheral surface of the cylinder body (1), of the piston (2), and a first oil return pipeline (22) with a rod cavity, communicated with the first pressure relief hole (21) and the cylinder body (1), is arranged in the piston (2).

2. Hydraulic cylinder according to claim 1, characterized in that the outer circumferential surface of the piston (2) is provided with a plurality of said first relief holes (21) distributed uniformly in the circumferential direction.

3. Hydraulic cylinder according to claim 2, characterized in that the piston (2) is provided with a first annular groove (23) on its outer circumference, a sealing structure being provided in the first annular groove (23).

4. Hydraulic cylinder according to claim 3, characterized in that the piston (2) is provided on its outer circumference with the first annular grooves (23) on both sides of the first relief bore (21) in the axial direction.

5. Hydraulic cylinder according to claim 1, characterized in that it comprises a bottom (7) connected to the cylinder body (1), the cylinder body (1) being provided with a first oil port (11) adjacent to the bottom (7) and communicating with a rodless chamber.

6. The hydraulic cylinder according to claim 1, characterized in that the hydraulic cylinder comprises a guide ring (4) arranged in the cylinder body (1), the rod body (3) penetrates through the guide ring (4), a second pressure relief hole (41) is arranged on the inner circumferential surface of the guide ring (4) attached to the outer circumferential surface of the rod body (3), and a second oil return pipeline (42) communicated with the second pressure relief hole (41) and the rod cavity of the cylinder body (1) is arranged in the guide ring (4).

7. Hydraulic cylinder according to claim 6, wherein the inner circumferential surface of the pilot ring (4) is provided with a plurality of second relief holes (41) uniformly distributed in the circumferential direction.

8. Hydraulic cylinder according to claim 7, characterized in that the inner circumferential surface of the guide ring (4) is provided with a second annular groove (43), in which second annular groove (43) a sealing structure is provided.

9. Hydraulic cylinder according to claim 8, characterized in that the inner circumferential surface of the pilot ring (4) is provided with the second annular grooves (43) on both axial sides of the second relief hole (41).

10. Hydraulic cylinder according to claim 6, characterized in that the cylinder body (1) is provided with a second oil port (12) adjacent to the guide ring (4) and communicating with the rod chamber, the hydraulic cylinder comprising a nipple seat (6) on the outer circumferential surface of the cylinder body (1) and an oil pipe (5) in fluid communication with the nipple seat (6) and the second oil port (12).