WO2019128131A1

WO2019128131A1 - Hydraulic oil cylinder with anti-shear structure

Info

Publication number: WO2019128131A1
Application number: PCT/CN2018/091125
Authority: WO
Inventors: 韦杰
Original assignee: 盐城市华森机械有限公司
Priority date: 2017-12-27
Filing date: 2018-06-13
Publication date: 2019-07-04
Also published as: CN108087376A; CN108087376B; DE112018000074T5

Abstract

A hydraulic oil cylinder with an anti-shear structure, comprising an oil cylinder (1), an oil storage tank (2), and a piston (3). The piston (3) is slidably assembled in the oil cylinder (1). The inner space of the oil cylinder (1) is divided into a rodless cavity (101) and a rod cavity (102) by means of the piston (3). The rodless cavity (101) is communicated with the inner space of the oil storage tank (2). The oil storage tank (2) is coaxially connected to the oil cylinder (1) by means of assembly cooperation of a logic valve cover (4) and an oil cylinder rear cover (5). The logic valve cover (4) is provided with a valve accommodating cavity (401) used for accommodating a logic valve (6). The end face of the logic valve (6) is flush with the end face of the logic valve cover (4). The logic valve cover (4), the logic valve (6), and the oil cylinder rear cover (5) are provided with an oil pipeline communicating the oil storage tank (2) with the oil cylinder (1). The hydraulic oil cylinder can obviously lower the machining and assembling difficulty, and reduce the production cost. In addition, the hydraulic oil cylinder can be used as long as an oil pipeline in a valve element of the logic valve is communicated with an oil hole of the logic valve cover and an oil hole of the oil cylinder rear cover even if the assembling positions of the logic valve cover and the oil cylinder rear cover are deviated slightly, and thus the stability and durability of the hydraulic oil cylinder are greatly improved.

Description

Hydraulic cylinder with anti-shear structure

Technical field

The invention relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder with a shear-proof structure.

Background technique

The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion). It is simple in structure and reliable in operation. When it is used to realize the reciprocating motion, the speed reducing 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 reciprocating motion of the hydraulic rod is mainly achieved by the change of the hydraulic pressure on both sides of the piston rod, specifically by the opening and closing of the logic valve.

However, in the existing hydraulic cylinders, since the logic valves need to communicate with the oil chambers on both sides of the piston rod, it is necessary to place a part of the logic valve in the left oil chamber part and the other part in the right side oil during processing and installation. In the cavity part, the processing and mounting method requires extremely high coaxiality accuracy for the left oil chamber component, the logic valve, and the right oil chamber component. If the three are not coaxial, the coaxiality is not high. Difficult to assemble, so the processing is difficult, the production cost is high, and once the position of the three is shifted during use, the logic valve will be subjected to radial shear force from the oil chamber components on the left and right sides, resulting in a logic valve. The valve core is deformed. Because the diameter of the oil passage pipe opened in the spool of the logic valve is generally small, once the logic valve is deformed, the oil passage in the spool is easily blocked, and the spool is stuck. Hydraulic cylinders also lose their effectiveness. Therefore, the existing hydraulic cylinder structure results in not only high processing cost, but also unstable operation, and oil passage clogging is likely to occur.

Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to provide a hydraulic cylinder having a shear-proof structure, which can reduce the processing difficulty and ensure that the logic valve is not blocked by the shearing force during installation and use.

To achieve the above object, the present invention adopts a method of: a hydraulic cylinder having a shear-proof structure, comprising a cylinder, an oil storage tank, a piston; the piston being slidably fitted in the cylinder, the piston The inner space of the cylinder is divided into a rodless cavity and a rod cavity, and the rodless cavity is in communication with the inner space of the oil storage tank, and the oil storage tank is assembled and matched with the cylinder by a logic valve cover and a cylinder rear cover Coaxially connected, the logic valve cover is provided with a valve chamber for accommodating a logic valve, the logic valve end surface is flush with an end surface of the logic valve cover, and the logic valve cover, the logic valve and the cylinder back cover are arranged There is a fuel line connecting the oil storage tank to the oil cylinder.

As an improvement of the present invention, a large open cavity and a small open cavity are respectively disposed on two sides of the rear cover of the cylinder, and the large open cavity is for receiving a cylinder, and the small open cavity is used for coaxially fitting connection with the logic valve cover.

As an improvement of the present invention, the cylinder back cover is provided with a cylindrical oil passage hole, and the cylindrical oil passage hole communicates with the small opening chamber.

As an improvement of the present invention, the logic valve cover is provided with a tapered oil passage for communicating the oil storage tank with the logic valve.

As an improvement of the present invention, the logic valve cover is further provided with a return oil pipe, and the oil return pipe is placed in the oil storage tank.

Beneficial effects:

A hydraulic cylinder with anti-shear structure, the logic valve is completely placed directly into the logic valve cover, the valve core is not easy to be stuck, then only the coaxial connection of the logic valve cover and the cylinder back cover can be ensured, and The lower coaxiality requirement can significantly reduce the difficulty of processing and assembly, reduce the production cost, and even if the position of the logic valve cover and the cylinder back cover is offset, as long as the oil pipe in the spool of the logic valve is still The oil hole is connected, and the hydraulic cylinder can continue to be used, which greatly improves the stability and durability of the hydraulic cylinder.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention;

Figure 2 is a schematic structural view of a logic valve cover of the present invention;

Figure 3 is a schematic view showing the structure of the cylinder back cover of the present invention.

The components in the figure are:

1-cylinder, 101-rodless chamber, 102-rod chamber, 2-tank, 3-piston, 4-logic bonnet, 401-valve chamber, 402-conical oil hole, 5-cylinder Cover, 501-large open cavity, 502-small open cavity, 503-cylindrical oil hole, 6-logic valve, 7-return pipe.

Detailed ways

The present invention is further described in the following with reference to the accompanying drawings, and the accompanying drawings It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to the directions in the image, the words "inside" and "outside" "Respectively refers to the direction toward or away from the geometric center of a particular component.

As shown in the figure, a hydraulic cylinder having a shear-proof structure includes a cylinder 1, an oil storage tank 2, a piston 3; the piston 3 is slidably fitted in the cylinder 1, and the piston 3 is to be the cylinder 1 The internal space is divided into a rodless chamber 101 and a rod chamber 102, and the rodless chamber 101 communicates with the internal space of the oil storage tank 2, and the oil storage tank 2 passes between the logic valve cover 4 and the cylinder back cover 5 An assembly fit is coaxially coupled to the cylinder 1 , the logic valve cover 4 is provided with a valve chamber 401 for receiving a logic valve 6 , the end surface of the logic valve 6 being flush with an end surface of the logic valve cover 4 The logic valve cover 4, the logic valve 6, and the cylinder rear cover 5 are provided with an oil passage pipe that communicates the oil storage tank 2 with the oil cylinder 1.

The principle of the invention: the oil passage in the existing oil cylinder is composed of a logic valve cover, a logic valve and a three-stage oil passage in the rear cover of the cylinder, and the oil passage in the logic valve spool is used to connect the oil on both sides. The cavity realizes the circulation of hydraulic oil on both sides. Once a blockage occurs in the entire oil pipeline, the hydraulic cylinder will be ineffective, and the diameter of the oil passage of the spool will be small, and if it is slightly deformed, it will be blocked and the oil passages on both sides will be blocked. However, the logic valve of the present invention is placed in the logic valve cover without being subjected to radial shear force, and only needs to ensure that the pipe port of the oil pipe on the logic valve cover covers the oil passage pipe of the logic valve spool, and the rear of the oil cylinder The pipe port covering the oil pipe encloses the oil pipe of the logic valve spool to ensure the smooth flow of the entire oil pipe of the oil cylinder. The hydraulic cylinder of this structure not only has low coaxiality requirements during processing and assembly. The upper limit of the allowable offset of the component parts during use is also large, which can significantly improve the durability and stability of the cylinder.

As a modification of the present invention, a large open cavity 501 and a small open cavity 502 are respectively disposed on two sides of the cylinder rear cover 5, and the large open cavity 501 is for receiving the oil cylinder 1, and the small open cavity 502 is used for the logic valve. The cover 4 is coaxially assembled.

As an improvement of the present invention, the cylinder rear cover 5 is provided with a cylindrical oil passage hole 503, and the cylindrical oil passage hole 503 is in communication with the small opening chamber 502.

As a modification of the present invention, the logic valve cover 4 is provided with a tapered oil passage hole 402 for communicating the oil storage tank 2 with the logic valve 6.

As a modification of the invention, the logic valve cover 4 is further provided with a return oil pipe 7 in which the oil return pipe 7 is placed.

The invention provides a hydraulic cylinder with anti-shear structure, the logic valve is completely placed directly into the logic valve cover, and the valve core is not easily caught. In this case, only the coaxial connection between the logic valve cover and the cylinder back cover is ensured. Yes, and the coaxiality requirements of the two are relatively low, which can significantly reduce the difficulty of processing and assembly, reduce the production cost, and even if the position of the logic valve cover and the cylinder back cover is offset, as long as the valve body of the logic valve is in the oil pipeline It is also connected to the oil passage holes of the two, and the hydraulic cylinder can continue to be used, which greatly improves the stability and durability of the hydraulic cylinder.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification or equivalent change made according to the technical essence of the present invention still falls within the scope of the claimed invention. .

Claims

A hydraulic cylinder having a shear-proof structure, comprising: a cylinder, an oil storage tank, a piston; the piston is slidably fitted in the cylinder, the piston dividing the internal space of the cylinder into a rodless cavity and a rod chamber having a rod space communicating with an inner space of the oil storage tank, the oil storage tank being coaxially connected to the oil cylinder through an assembly fit between a logic valve cover and a cylinder back cover, the logic valve The cover is provided with a valve chamber for accommodating a logic valve, and the end surface of the logic valve is flush with an end surface of the logic valve cover, and the logic valve cover, the logic valve and the rear cover of the cylinder are provided with an oil storage tank connected to the oil cylinder Oil line.
A hydraulic cylinder having a shear-proof structure according to claim 1, wherein a large open cavity and a small open cavity are respectively disposed on two sides of the rear cover of the cylinder, and the large open cavity is for accommodating a cylinder, and the small open cavity For coaxial assembly connection with the logic valve cover.
A hydraulic cylinder having a shear-proof structure according to claim 2, wherein the cylinder rear cover is provided with a cylindrical oil passage hole, and the cylindrical oil passage hole communicates with the small opening chamber.
A hydraulic cylinder having a shear-proof structure according to claim 1, wherein said logic valve cover is provided with a tapered oil passage for communicating the oil storage tank with said logic valve.
A hydraulic cylinder having a shear-proof structure according to claim 1, wherein said logic valve cover is further provided with a return oil pipe, and said oil return pipe is disposed in said oil storage tank.