CN204900407U - Seal structure of pneumatic cylinder cylinder cap - Google Patents

Abstract

The application discloses a sealing structure of a cylinder head of a hydraulic cylinder. The hydraulic cylinder includes a cylinder body, a piston, a piston rod, a cylinder bottom and a cylinder head. In the cavity, one end of the piston rod is fixed to the piston, and the other end extends out of the cavity, the cylinder bottom is sealed and fixed to one end of the cylinder body, and the cylinder head is sleeved on the The outer side of the piston rod is fixed to the other end of the cylinder body. The cylinder body is located at one end of the cylinder head and is provided with a second cylinder body flange. The end face of the cylinder body is flush, and a cylinder liner and a guide sleeve are also provided between the second cylinder body flange and the cylinder head. The guide sleeve is located between the cylinder liner and the cylinder head. The cylinder The sleeve and the guide sleeve are sleeved on the outside of the piston rod, and a sealing ring is provided between the contact surface of the cylinder sleeve and the cylinder body. The hydraulic cylinder of the utility model has the advantages of convenient installation, low manufacturing cost and good sealing performance.

Description

Sealing structure of a hydraulic cylinder head

technical field

The present application relates to a hydraulic cylinder, in particular to a sealing structure of a cylinder head of a hydraulic cylinder.

Background technique

A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swing motion). It has simple structure and reliable operation. When it is used to realize reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the motion is stable, so it is widely used in various mechanical hydraulic systems. The output force of the hydraulic cylinder is proportional to the effective area of the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device.

Traditional hydraulic cylinders have the technical problems of inconvenient assembly and poor sealing.

Utility model content

The purpose of the utility model is to provide a sealing structure of a hydraulic cylinder head to overcome the deficiencies in the prior art.

In order to achieve the above object, the utility model provides the following technical solutions:

The embodiment of the present application discloses a sealing structure of a cylinder head of a hydraulic cylinder. The hydraulic cylinder includes a cylinder body, a piston, a piston rod, a cylinder bottom and a cylinder head. Sliding in the cavity, one end of the piston rod is fixed to the piston, and the other end extends out of the cavity, the cylinder bottom is sealed and fixed at one end of the cylinder body, and the cylinder head is sleeved On the outside of the piston rod and fixed to the other end of the cylinder, the cylinder is located at one end of the cylinder cover with a second cylinder flange, the end surface of the second cylinder flange and The end faces of the cylinder body are flush, and a cylinder liner and a guide sleeve are also provided between the second cylinder body flange and the cylinder head, and the guide sleeve is located between the cylinder liner and the cylinder head. The cylinder sleeve and the guide sleeve are sleeved on the outside of the piston rod, and a sealing ring is provided between the contact surface of the cylinder sleeve and the cylinder body.

Preferably, in the above sealing structure of a hydraulic cylinder head, the side of the cylinder liner facing the cylinder body is recessed to form an annular sealing ring installation groove, and the sealing ring is fixed on the sealing ring installation in the slot.

Preferably, in the sealing structure of the cylinder head of a hydraulic cylinder described above, the flange of the second cylinder body is fixed to the cylinder body by welding.

Preferably, in the sealing structure of the cylinder head of a hydraulic cylinder, the side of the cylinder liner facing the cavity protrudes from a ring-shaped protruding part, and the outer diameter of the protruding part is equal to that of the cavity. The diameter of the protruding part is located in the cavity.

Preferably, in the above sealing structure of a hydraulic cylinder head, the surface of the piston rod is plated with a chromium layer, and the thickness of the chromium layer is 0.05 mm.

Preferably, in the sealing structure of the cylinder head of a hydraulic cylinder described above, the inner surface of the cylinder body is plated with a chromium layer, and the thickness of the chromium layer is 30-40 μm.

Preferably, in the above-mentioned sealing structure of a hydraulic cylinder head, a sealing ring is provided between the piston and the inner wall of the cylinder body.

Preferably, in the sealing structure of the cylinder head of a hydraulic cylinder, a dust-proof ring and a rubber oil seal are further provided between the cylinder head and the piston rod.

Preferably, in the sealing structure of the cylinder head of a hydraulic cylinder described above, an exhaust valve hole communicating with the cavity is opened on the bottom of the cylinder.

Compared with the prior art, the utility model has the advantages of convenient installation, low manufacturing cost and good sealing performance of the hydraulic cylinder of the utility model.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments described in this application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of a hydraulic cylinder in a specific embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the drawings in the embodiments of the present invention. Apparently, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Fig. 1, the hydraulic cylinder includes a cylinder body 1, a piston 2, a piston rod 3, a cylinder bottom 4 and a cylinder head 5. The cylinder body 1 has a cavity connected in the axial direction, and the piston 2 slides in the cavity. One end of the piston rod 3 is fixed to the piston 2, and the other end extends out of the cavity, the cylinder bottom 4 is sealed and fixed to one end of the cylinder body 1, and the cylinder head 5 is sleeved on the The outer side of the piston rod 3 is fixed to the other end of the cylinder body 1 .

One end of the cylinder body 1 is provided with a first cylinder body flange 6, the end face of the first cylinder body flange 6 is flush with the end face of the cylinder body 1, and the cylinder bottom 4 and the first cylinder body The flanges 6 are detachably fixed by bolts, and a sealing ring 7 is provided between the contact surface of the cylinder bottom 4 and the cylinder body 1 .

Further, the side of the cylinder bottom 4 facing the cylinder body 1 is concavely formed with an annular sealing ring installation groove, and the sealing ring 7 is fixed in the sealing ring installation groove.

Further, the first cylinder flange 6 is fixed to the cylinder 1 by welding.

Further, the side of the cylinder bottom 4 facing the cavity is protruded with an annular protruding portion 41, the outer diameter of which is equal to the diameter of the cavity, and the protruding portion 41 is located at the inside the cavity.

The other end of the cylinder body 1 relative to the first cylinder body flange 6 is provided with a second cylinder body flange 8, and the end surface of the second cylinder body flange 8 is flush with the end surface of the cylinder body 1. A cylinder liner 9 and a guide sleeve 10 are also provided between the second cylinder body flange 8 and the cylinder head 5 , and the guide sleeve 10 is located between the cylinder liner 9 and the cylinder head 5 . The cylinder liner 9 and the guide sleeve 10 are sleeved on the outside of the piston rod 3 . A sealing ring 11 is provided between the contact surface of the cylinder liner 9 and the cylinder body 1 .

Further, the side of the cylinder liner 9 facing the cylinder body 1 is concavely formed with an annular seal ring installation groove, and the seal ring 11 is fixed in the seal ring installation groove.

Further, the second cylinder flange 8 is welded and fixed to the cylinder 1 .

Further, an annular protruding portion 91 protrudes from the side of the cylinder liner 9 facing the cavity, the outer diameter of the protruding portion 91 is equal to the diameter of the cavity, and the protruding portion 91 is located at the inside the cavity.

The second cylinder flange 8, the cylinder liner 9 and the cylinder head 5 are respectively provided with axially connected mounting holes with internal thread surfaces, and the cylinder liner 9 and the cylinder head 5 pass through the bolts in the mounting holes. 12 is fixed on the second cylinder flange 8 .

The cylinder head 5 protrudes from the side facing the cylinder liner 9 with an annular protruding portion 51 , and the cylinder liner 9 cooperates with the protruding portion 51 to form a stepped portion 92 , and the protruding portion 51 abuts against On the side of the stepped portion 92 , an annular sealing ring 13 is disposed between the protruding portion 51 and the stepped portion 92 .

Further, the protruding portion 51 is concavely formed with an annular sealing ring installation groove, and the sealing ring 13 is fixed in the sealing ring installation groove.

Further, a dustproof ring 14 and a rubber oil seal 15 are also provided between the cylinder head 5 and the piston rod 3 .

Further, a sealing ring 16 is provided between the piston 2 and the inner wall of the cylinder 1 .

Further, the cylinder bottom 4 is provided with an exhaust valve hole 17 communicating with the cavity.

Further, the surface of the piston rod 3 is plated with a chromium layer with a thickness of 0.05 mm.

Further, the inner surface of the cylinder body 1 is plated with a chromium layer, and the thickness of the chromium layer is 30-40 μm.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. any such actual relationship or order exists between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above is only the specific implementation of the application, and it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the application, some improvements and modifications can also be made, and these improvements and modifications are also It should be regarded as the protection scope of this application.

Claims (9)

1. A sealing structure of a hydraulic cylinder head, characterized in that, the hydraulic cylinder comprises a cylinder block, a piston, a piston rod, a cylinder bottom and a cylinder cover, and the cylinder body has a cavity communicated in the axial direction, and the The piston slides in the cavity, one end of the piston rod is fixed to the piston, and the other end extends out of the cavity, the cylinder bottom is sealed and fixed at one end of the cylinder body, and the cylinder head cover It is arranged on the outside of the piston rod and fixed on the other end of the cylinder body. The cylinder body is located at one end of the cylinder head and is provided with a second cylinder body flange. The end surface of the second cylinder body flange flush with the end face of the cylinder body, a cylinder liner and a guide sleeve are also provided between the second cylinder body flange and the cylinder head, and the guide sleeve is located between the cylinder liner and the cylinder head, so The cylinder sleeve and the guide sleeve are sleeved on the outside of the piston rod, and a sealing ring is provided between the contact surface of the cylinder sleeve and the cylinder body. 2. The sealing structure of a hydraulic cylinder head according to claim 1, characterized in that: the side of the cylinder liner facing the cylinder body is recessed to form an annular sealing ring installation groove, and the sealing ring is fixed in the sealing ring installation groove. 3 . The sealing structure of a cylinder head of a hydraulic cylinder according to claim 1 , wherein the flange of the second cylinder body is welded and fixed to the cylinder body. 4 . 4. The sealing structure of a cylinder head of a hydraulic cylinder according to claim 1, wherein an annular protruding portion protrudes from the side of the cylinder liner facing the cavity, and the outer portion of the protruding portion The diameter is equal to the diameter of the cavity, and the protruding part is located in the cavity. 5 . The sealing structure of a hydraulic cylinder head according to claim 1 , characterized in that: the surface of the piston rod is plated with a chromium layer, and the thickness of the chromium layer is 0.05 mm. 6 . The sealing structure of a cylinder head of a hydraulic cylinder according to claim 1 , characterized in that: the inner surface of the cylinder body is plated with a chromium layer, and the thickness of the chromium layer is 30-40 μm. 7. The sealing structure of a cylinder head of a hydraulic cylinder according to claim 1, wherein a sealing ring is provided between the piston and the inner wall of the cylinder body. 8 . The sealing structure of a cylinder head of a hydraulic cylinder according to claim 1 , wherein a dustproof ring and a rubber oil seal are also provided between the cylinder head and the piston rod. 9 . The sealing structure of a cylinder head of a hydraulic cylinder according to claim 1 , wherein an exhaust valve hole communicating with the cavity is opened on the bottom of the cylinder. 10 .