CN215830859U

CN215830859U - Oil cylinder for linkage

Info

Publication number: CN215830859U
Application number: CN202121852651.5U
Authority: CN
Inventors: 胡雪
Original assignee: Jiangsu World High Tech Agricultural Equipment Co Ltd
Current assignee: Jiangsu World High Tech Agricultural Equipment Co Ltd
Priority date: 2021-08-10
Filing date: 2021-08-10
Publication date: 2022-02-15
Anticipated expiration: 2031-08-10

Abstract

The utility model belongs to the technical field of hydraulic pressure, and particularly relates to an oil cylinder for linkage, which comprises a throttling channel and a one-way valve, wherein the throttling channel is formed in a piston so as to enable a rod cavity and a rodless cavity of the oil cylinder to be communicated, and the one-way valve is arranged in the throttling channel so as to enable oil in the oil cylinder to only flow from the rodless cavity to the rod cavity. The technical problem that the piston sealing element in the prior art is scratched by a throttling port in the inner wall of the cylinder body to cause damage to the sealing element is solved.

Description

Oil cylinder for linkage

Technical Field

The utility model belongs to the technical field of hydraulic pressure, and particularly relates to an oil cylinder for linkage.

Background

As shown in fig. 1-2, the linkage of two oil cylinders is realized by arranging a throttle opening a with a smaller aperture at a cylinder body oil outlet b of a first oil cylinder, wherein the throttle opening a is arranged on the inner wall of the cylinder body and is communicated with the cylinder body oil outlet b. The action process of the first stage: the piston of the first oil cylinder is positioned at a left limit position, oil enters from a rodless cavity of the first oil cylinder and pushes the piston to move rightwards, when the piston reaches a right limit position, a throttling port a of the first oil cylinder is communicated with the rodless cavity, the oil in the rodless cavity of the first oil cylinder enters into a rodless cavity of the second oil cylinder through the throttling port a to push the piston of the second oil cylinder positioned at the left limit position to move rightwards, the throttling port a is used for realizing oil filling before first formal work, and the oil can be stored in a rod cavity of the first oil cylinder and a rodless cavity of the second oil cylinder after first oil filling is finished; the action process of the second stage: the piston of the second oil cylinder moves leftwards, oil enters the rod cavity of the first oil cylinder from the rodless cavity of the second oil cylinder to push the piston of the first oil cylinder to move leftwards, the throttle opening a is quickly blocked by the piston moving leftwards, the piston continues to move leftwards to cross the throttle opening a, the throttle opening a is communicated with the rod cavity of the first oil cylinder, and then the piston of the first oil cylinder moves to the left limit position to complete a movement cycle. (note: the equivalent volumes of the rod chamber of the first cylinder and the rodless chamber of the second cylinder are equal, so that linkage can be realized).

Although the serial linkage of the two oil cylinders can be effectively solved, the piston of the first oil cylinder needs to pass through the throttling opening a for many times in the working process, the sealing element c on the piston is scratched by the port of the throttling opening a in the process, and the sealing element c is easily damaged, so that the sealing performance is poor, and the oil cylinder is internally drained.

Disclosure of Invention

The utility model provides an oil cylinder for linkage, which solves the technical problem that a piston sealing element in the prior art is scratched by a throttling port in the inner wall of a cylinder body to cause damage to the sealing element.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the utility model provides an oil cylinder for linkage, which comprises: the throttling channel is formed in the piston so as to enable a rod cavity and a rodless cavity of the oil cylinder to be communicated; and the check valve is arranged in the throttling channel so that oil in the cylinder can only flow from the rodless cavity to the rod cavity.

Further, when the piston moves to the maximum limit position of the volume of the rodless cavity, the throttling channel is communicated with a rod cavity oil port in the rod cavity.

Further, the preset opening force of the one-way valve is larger than the friction force between the piston and the inner wall of the cylinder body.

Further, under the limit position where the volume of the rodless cavity is maximum, a flow space is formed on the side surface of the piston in the rod cavity, and the flow space is respectively communicated with the throttling channel and the oil port of the rod cavity.

Based on the technical scheme, the utility model can realize the following technical effects:

the utility model relates to an oil cylinder for linkage, which aims to solve the problem that a piston sealing element in the prior art is easily scratched by a throttling port on the inner wall of a cylinder body, a new way is created, a throttling channel is arranged on a piston, a one-way valve is arranged in the channel of the throttling channel, the flow direction of the one-way valve is that a rodless cavity enters into and exits from a rod cavity, and when the piston moves from the rodless cavity to the rod cavity, oil can enter into the rod cavity through the throttling channel on the piston and finally enters into a downstream rodless cavity of a downstream oil cylinder to push the downstream piston of the downstream oil cylinder to move. Therefore, the oil cylinder for linkage avoids the opening of the inner wall of the cylinder body, thereby solving the technical problem that the sealing element is easy to damage caused by the fact that the sealing element of the piston in the prior art is scratched by the throttling opening on the inner wall of the cylinder body.

Drawings

FIG. 1 is a schematic view of a first ram in a prior art linkage ram system;

FIG. 2 is a schematic diagram of a linkage cylinder system of the prior art;

FIG. 3 is a schematic view of the cylinder for linkage of the present invention in an initial state;

FIG. 4 is a schematic view of the linkage cylinder of the present invention in its extreme condition;

fig. 5 is a partially enlarged view of a portion a in fig. 4;

FIG. 6 is a schematic diagram of a linkage cylinder system of the present invention.

Wherein: a-a choke; b-a cylinder oil outlet; c-a seal; 1-piston, 11-throttling channel; 2-rod cavity, 21-rod cavity oil port and 22-flowing space; 3-rodless cavity, 31-rodless cavity oil port; 4-a one-way valve; 1' -downstream cylinder.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 3 to 6, the present embodiment provides a cylinder for linkage, which includes a throttle passage 11 and a check valve 4, wherein the throttle passage 11 is opened on the piston 1 to communicate the rod chamber 2 and the rodless chamber 3 of the cylinder; the check valve 4 is disposed in the throttle passage 11 so that the cylinder oil can flow only from the rodless chamber 3 to the rod chamber 2.

In the oil cylinder for linkage of the embodiment, in order to solve the problem that a sealing element c of a piston 1 in the prior art is easily scratched by a throttling port a in the inner wall of a cylinder body, a new method is created, a throttling channel 11 is arranged on the piston 1, a check valve 4 is arranged in the channel of the throttling channel 11, the flow direction of the check valve 4 is that a rodless cavity 3 enters a rod cavity 2 and exits, and when the piston 1 moves from the rodless cavity 3 to the rod cavity 2, oil can enter the rod cavity 2 through the throttling channel 11 on the piston 1 and finally enters a downstream rodless cavity of a downstream oil cylinder 1 'to push a downstream piston of the downstream oil cylinder 1' to move. Therefore, the oil cylinder for linkage in the embodiment avoids the hole opening on the inner wall of the cylinder body, and the technical problem that the sealing element c of the piston 1 is scratched by the throttling port a on the inner wall of the cylinder body to cause damage to the sealing element c in the prior art is solved.

In this embodiment, when the piston 1 moves to the limit position where the volume of the rodless chamber 3 is maximum, the throttle passage 11 communicates with the rod chamber oil port 21 in the rod chamber 2. The purpose of this arrangement is that in actual operation, for the stability of the whole system, taking two cylinders in series as an example, when oil is filled for the first time, the oil filled in the downstream cylinder 1 'in series at the downstream is the oil filled in the upstream cylinder, that is, after the action of the cylinder for linkage of this example is completed, that is, when the piston 1 moves to the limit position where the volume of the rodless chamber 3 is maximum and does not move any more, the oil in the rodless chamber 3 flows into the downstream cylinder 1' through the throttle channel 11.

Further, in order to ensure that the oil does not flow into the downstream oil cylinder 1 'before the piston 1 of the oil cylinder for linkage moves to the maximum limit position of the volume of the rodless cavity 3 in actual operation, the preset opening force of the check valve 4 of the oil cylinder for linkage of the embodiment is greater than the friction force between the piston 1 and the inner wall of the cylinder body, so that the oil in the rodless cavity 3 must firstly push the piston 1 to the limit position to open the check valve 4 to enable the oil to enter the downstream oil cylinder 1'.

Specifically, in order to meet the requirement of actual operation stability, in the oil cylinder for linkage of the embodiment, under the limit position where the volume of the rodless chamber 3 is the largest, the rod chamber 2 forms a flow space 22 on the side surface of the piston 1, and the flow space 22 is respectively communicated with the throttling channel 11 and the rod chamber oil port 21.

The oil cylinder for linkage of the embodiment is matched with the oil filling and working stroke conditions of the series system as follows: taking two cylinders connected in series as an example, as shown in fig. 3-6, in an initial state, when the volume of the rod chamber 2 is in a maximum state, oil enters the rod chamber 3 from the cylinder at the upstream, that is, the rod-free chamber oil port 31 of the cylinder for linkage in this embodiment enters the rod chamber 3 to push the piston 1 to move towards the rod chamber 2, in this process, since the opening preset force of the check valve 4 is greater than the friction force between the piston 1 and the inner wall of the cylinder body, the oil does not enter the rod chamber 2, the piston 1 continues to move to a limit position, the volume of the rod-free chamber 3 is in a maximum state, the piston 1 abuts against the end of the rod chamber 2 and does not move any more, at this time, the oil continues to be input from the rod-free chamber oil port 31, the oil pressure in the rod chamber 3 increases, the oil in the rod chamber 3 pushes the spool of the check valve 4 open by the oil in the rod chamber 3, the oil sequentially passes through the throttling channel 11, the flow space 22, and the rod chamber oil port 21 to enter the rod chamber at the downstream rod chamber oil port 1' until the downstream piston of the downstream moves to a limit position And in the following working stroke, the downstream piston of the downstream oil cylinder 1 'retreats from the limit position, the oil liquid flows to the rod cavity 2 of the oil cylinder for linkage from the downstream rodless cavity of the downstream oil cylinder 1', the oil liquid entering the rod cavity 2 pushes the piston 1 to move to the initial position, and a complete stroke is completed, and the oil liquid cannot enter the rodless cavity 3 through the throttling channel 11 due to the existence of the one-way valve 4, so that the condition of internal leakage of the oil cylinder is prevented.

It should be understood that the above-described specific embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Obvious variations or modifications which are within the spirit of the utility model are possible within the scope of the utility model.

Claims

1. A hydro-cylinder for linkage, its characterized in that includes:

the throttling channel (11) is formed in the piston (1) so that the rod cavity (2) of the oil cylinder is communicated with the rodless cavity (3);

a check valve (4), said check valve (4) disposed within said restricted passage (11) such that in-cylinder oil can only flow from said rodless chamber (3) to said rod chamber (2).

2. The cylinder for linkage according to claim 1, wherein when the piston (1) moves to the limit position where the volume of the rodless chamber (3) is maximum, the throttling channel (11) is communicated with the rod chamber oil port (21) of the rod chamber (2).

3. The oil cylinder for linkage according to claim 2, wherein the preset opening force of the one-way valve (4) is larger than the friction force between the piston (1) and the inner wall of the cylinder body.

4. The oil cylinder for linkage according to claim 2, wherein at a maximum position where the volume of the rodless chamber (3) is maximum, the rod chamber (2) is formed with a flow space (22) at a side of the piston (1), and the flow space (22) is respectively communicated with the throttling channel (11) and the rod chamber oil port (21).