WO2024066270A1

WO2024066270A1 - Oil cylinder system, boom and crane

Info

Publication number: WO2024066270A1
Application number: PCT/CN2023/085663
Authority: WO
Inventors: 武元; 彭世发; 刘森
Original assignee: 三一海洋重工有限公司; 湖南三一港口设备有限公司
Priority date: 2022-09-26
Filing date: 2023-03-31
Publication date: 2024-04-04
Also published as: CN115405580A

Abstract

The present disclosure relates to an oil cylinder system, a boom and a crane. The oil cylinder system comprises a first oil cylinder, a second oil cylinder and an oil supply pipeline; the oil supply pipeline is separately connected to the first oil cylinder and the second oil cylinder; when the oil supply pipeline is in a first state, the oil supply pipeline guides hydraulic oil to drive the first oil cylinder to operate alone; when the oil supply pipeline is in a second state, the oil supply pipeline guides the hydraulic oil to drive the second oil cylinder to operate alone; when the oil supply pipeline is in a third state, the oil supply pipeline guides the hydraulic oil to drive the first oil cylinder and the second oil cylinder to operate synchronously. Therefore, when the two oil cylinders need to operate synchronously, the oil supply pipeline is controlled to be in the third state, and the oil supply pipeline guides the oil to drive the first oil cylinder and the second oil cylinder to operate synchronously; and if the synchronous operation of the first oil cylinder and the second oil cylinder has errors, the oil supply pipeline is switched to the first state or the second state to control the first oil cylinder or the second oil cylinder to operate alone, thus eliminating the errors in the synchronization process.

Description

Cylinder systems, booms and cranes

Technical Field

The present disclosure relates to the technical field related to lifting machinery, and in particular to an oil cylinder system, a lifting arm and a crane.

Background technique

In mechanical equipment, it is often necessary to use two oil cylinders for synchronous operation. When the two oil cylinders work synchronously, the piston rods of the two oil cylinders are required to extend and retract at the same speed. In the prior art, the synchronous operation of the two oil cylinders generally adopts "connecting the two oil cylinders with a parallel oil circuit and relying on a diverter valve to achieve synchronization of the two oil cylinders". However, when distributing the flow, the diverter valve is easily affected by factors such as load, cylinder assembly error and structural component processing error, resulting in uneven flow distribution. Therefore, the synchronization of the two oil cylinders when working is poor.

Summary of the invention

In view of this, the present disclosure is dedicated to providing a cylinder system, a boom and a crane to improve the synchronization of two cylinders during operation.

According to a first aspect of an embodiment of the present disclosure, there is provided a cylinder system including a first cylinder, a second cylinder and an oil supply pipeline; the oil supply pipeline is connected to the first cylinder and the second cylinder, respectively; the rod chamber of the first cylinder is connected to the rodless chamber of the second cylinder through the oil supply pipeline, or the rod chamber of the first cylinder is directly connected to the rodless chamber of the second cylinder, wherein when the oil supply pipeline is in a first state, the oil supply pipeline is used to guide the hydraulic oil to drive the first cylinder to move alone; when the oil supply pipeline is in a second state, the oil supply pipeline is used to guide the hydraulic oil to drive the second cylinder to move alone; when the oil supply pipeline is in a third state, the oil supply pipeline is used to guide the hydraulic oil to drive the first cylinder and the second cylinder to move synchronously.

In one embodiment, the oil supply pipeline includes a first oil port, a second oil port, a first valve, a second valve, and a third valve; the first oil port is connected to the rodless chamber of the first oil cylinder; the first oil port is connected to the rodless chamber of the first oil cylinder through the first valve; The first oil port is connected to the rodless chamber of the second oil cylinder by passing through the first valve and the third valve in sequence;

The second oil port is connected to the rod chamber of the first oil cylinder through the second valve; the second oil port is connected to the rod chamber of the second oil cylinder;

The rod chamber of the first oil cylinder is connected to the rodless chamber of the second oil cylinder through the third valve; the rod chamber of the first oil cylinder is connected to the rodless chamber of the second oil cylinder through the third valve.

When the first valve is closed, the second valve is opened, and the third valve is closed, the oil supply pipeline is in a first state; when the first valve is opened, the second valve is closed, and the third valve is opened, the oil supply pipeline is in a second state; when the first valve is closed, the second valve is closed, and the third valve is opened, the oil supply pipeline is in a third state.

In one embodiment, the first valve, the second valve and the third valve are solenoid valves.

In one embodiment, the oil supply pipeline includes a first oil port, a second oil port, a first valve, a second valve, and a fourth valve; the first oil port is connected to the rodless chamber of the first oil cylinder; the first oil port is connected to the rod chamber of the first oil cylinder through the first valve; the second oil port is connected to the rod chamber of the first oil cylinder through the second valve; the second oil port is connected to the rod chamber of the second oil cylinder through the fourth valve; the rod chamber of the first oil cylinder is connected to the rodless chamber of the second oil cylinder.

When the first valve is closed, the second valve is opened, and the fourth valve is closed, the oil supply pipeline is in a first state; when the first valve is opened, the second valve is closed, and the fourth valve is opened, the oil supply pipeline is in a second state; when the first valve is closed, the second valve is closed, and the fourth valve is opened, the oil supply pipeline is in a third state.

In one embodiment, the first valve, the second valve and the fourth valve are solenoid valves.

In one embodiment, the oil supply pipeline includes a first oil port, a second oil port, a first valve, and a three-way valve; the first oil port is connected to the rodless chamber of the first oil cylinder; the first oil port is connected to the rod chamber of the first oil cylinder through the first valve; the second oil port is connected to the first opening of the three-way valve; the second opening of the three-way valve is connected to the rod chamber of the first oil cylinder; the third opening of the three-way valve is connected to the rod chamber of the second oil cylinder; the rod chamber of the first oil cylinder is connected to the rodless chamber of the second oil cylinder.

When the first valve is closed and the first opening of the three-way valve is connected to the second opening, the oil supply pipeline is in the first state; when the first valve is opened and the first opening of the three-way valve is connected to the third opening, the oil supply pipeline is in the second state; when the first valve is closed and the first opening of the three-way valve is connected to the third opening, the oil supply pipeline is in the third state.

In one embodiment, the first valve is a solenoid valve, and the three-way valve is a two-position three-way solenoid valve.

In one embodiment, it also includes an oil supply module; the oil supply module is connected to the first oil port and the second oil port respectively; the oil supply module is used to supply hydraulic oil to the first oil port and receive return oil from the second oil port, or to supply hydraulic oil to the second oil port and receive return oil from the first oil port.

According to a second aspect of an embodiment of the present disclosure, there is provided a lifting arm, comprising a cylinder system as provided in any embodiment of the first aspect of the present disclosure.

According to a third aspect of an embodiment of the present disclosure, a crane is provided, comprising a lifting arm provided in the second aspect of the present disclosure.

In the oil cylinder system provided by the present disclosure, when the oil supply pipeline is in the first state, the oil supply pipeline is used to guide oil to drive the first oil cylinder to move alone; when the oil supply pipeline is in the second state, the oil supply pipeline is used to guide oil to drive the second oil cylinder to move alone; when the oil supply pipeline is in the third state, the oil supply pipeline is used to guide oil to drive the first oil cylinder and the second oil cylinder to move synchronously. With such a configuration, when the two oil cylinders need to move synchronously, the oil supply pipeline is controlled to be in the third state, and the oil supply pipeline guides oil to drive the first oil cylinder and the second oil cylinder to move synchronously. As the synchronous movement proceeds, if there is an error in the synchronous movement of the first oil cylinder and the second oil cylinder, the oil supply pipeline can be switched to the first state or the second state, and the error in the synchronization process of the first oil cylinder and the second oil cylinder can be eliminated by controlling the first oil cylinder or the second oil cylinder to move alone, thereby improving the synchronization of the two oil cylinders when working.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other purposes, features and advantages of the present disclosure will become more apparent by describing the embodiments of the present disclosure in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

FIG1 is a schematic structural diagram of an oil cylinder system provided in one embodiment of the present disclosure.

FIG2 is a schematic structural diagram of an oil cylinder system provided in another embodiment of the present disclosure.

FIG3 is a schematic structural diagram of an oil cylinder system provided in yet another embodiment of the present disclosure.

FIG4 is a schematic structural diagram of an oil cylinder system provided in yet another embodiment of the present disclosure.

Reference numerals:
1. First oil cylinder; 2. Second oil cylinder; 3. Oil supply pipeline; 31. First valve; 32. Second valve; 33. Third valve; 34. Fourth valve; 35. Three-way valve; 351. First opening; 352. Second opening; 353. Third opening; 36. First oil port; 37. Second oil port; 4. Oil supply module.

Detailed ways

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments.

Application Overview

In order to solve the above problems, the embodiment of the present disclosure provides an oil cylinder system, in which when the oil supply pipeline 3 is in the first state, the oil supply pipeline 3 is used to guide the oil to drive the first oil cylinder 1 to move alone; when the oil supply pipeline 3 is in the second state, the oil supply pipeline 3 is used to guide the oil to drive the second oil cylinder 2 to move alone; when the oil supply pipeline 3 is in the third state, the oil supply pipeline 3 is used to guide the oil to drive the first oil cylinder 1 and the second oil cylinder 2 to move synchronously. With this arrangement, when the two oil cylinders need to move synchronously, the oil supply pipeline 3 is controlled to be in the third state, and the oil supply pipeline 3 guides the oil to drive the first oil cylinder 1 and the second oil cylinder 2 to move synchronously. During the synchronous movement, if there is an error in the synchronous movement of the first cylinder 1 and the second cylinder 2, the oil supply pipeline 3 can be switched to the first state or the second state, and the first cylinder 1 or the second cylinder 2 can be controlled to move independently to eliminate the error in the synchronization process of the first cylinder 1 and the second cylinder 2, thereby improving the synchronization of the two cylinders during operation.

After introducing the basic principles of the present disclosure, various non-limiting embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

Exemplary Systems

FIG1 is a schematic diagram of the structure of a cylinder system provided by an embodiment of the present disclosure. As shown in FIG1 , the cylinder system includes a first cylinder 1, a second cylinder 2 and an oil supply pipeline 3. The oil supply pipeline 3 is connected to the first cylinder 1 and the second cylinder 2, respectively. The rod chamber of the first cylinder 1 is connected to the rodless chamber of the second cylinder 2 through the oil supply pipeline 3, or the rod chamber of the first cylinder 1 is directly connected to the rodless chamber of the second cylinder 2. When the oil supply pipeline 3 is in a first state, the oil supply pipeline 3 is used to guide the hydraulic oil to drive the first cylinder 1 to move; when the oil supply pipeline 3 is in a second state, the oil supply pipeline 3 is used to guide the hydraulic oil to drive the second cylinder 2 to move; when the oil supply pipeline 3 is in a third state, the oil supply pipeline 3 is used to guide the hydraulic oil to drive the first cylinder 1 and the second cylinder 2 to move synchronously.

With such arrangement, when the two cylinders need to move synchronously, the oil supply pipeline 3 is controlled to be in the third state, and the oil supply pipeline 3 guides the oil to drive the first cylinder 1 and the second cylinder 2 to move synchronously. As the synchronous movement proceeds, if there is an error in the synchronization of the first cylinder 1 and the second cylinder 2, the oil supply pipeline 3 can be switched to the first state or the second state to control the first cylinder 1 or the second cylinder 2 to move alone, so as to eliminate the error in the synchronization process of the first cylinder 1 and the second cylinder 2 and improve the synchronization of the two cylinders during operation. In practical applications, the actual states of the first cylinder 1 and the second cylinder 2 fed back by other modules can be obtained. When it is found that the two are not synchronized, the state of the first cylinder 1 or the second cylinder 2 is adjusted separately to make the two states the same. Alternatively, in the process of controlling the synchronous movement of the first cylinder 1 and the second cylinder 2, when the rod of the control cylinder is fully retracted, the rod of the first cylinder 1 is controlled to be fully retracted separately and the rod of the second cylinder 2 is controlled to be fully retracted separately. In this way, it can be ensured that after “the rod of the first cylinder 1 is controlled to be fully retracted separately and the rod of the second cylinder 2 is controlled to be fully retracted separately”, the states of the first cylinder 1 and the second cylinder 2 are synchronized; when the rod of the control cylinder is fully extended, the rod of the first cylinder 1 is controlled to be fully extended separately and the rod of the second cylinder 2 is controlled separately The rod of the second oil cylinder 2 is controlled to be fully extended, so that it can be ensured that after "the rod of the first oil cylinder 1 is controlled to be fully extended alone and the rod of the second oil cylinder 2 is controlled to be fully extended alone", the states of the first oil cylinder 1 and the second oil cylinder 2 are synchronized.

Specifically, there are many specific structures of the oil supply pipeline 3, and the following are listed in the solutions provided in the present disclosure.

2 , a first specific structure of the oil supply pipeline 3 is as follows.

The oil supply pipeline 3 includes a first oil port 36, a second oil port 37, a first valve 31, a second valve 32, and a third valve 33. The first oil port 36 is connected to the rodless chamber of the first oil cylinder 1, the first oil port 36 is connected to the rod chamber of the first oil cylinder 1 through the first valve 31, and the first oil port is connected to the rodless chamber of the second oil cylinder 2 through the first valve 31 and the third valve 33 in sequence.

The second oil port 37 is connected to the rod chamber of the first oil cylinder 1 through the second valve 32, and the second oil port 37 is connected to the rod chamber of the second oil cylinder 2. The rod chamber of the first oil cylinder 1 is connected to the rodless chamber of the second oil cylinder 2 through the third valve 33, and the rod chamber of the first oil cylinder 1 is connected to the rodless chamber of the second oil cylinder 2 through the third valve 33.

In actual application, when the first valve 31 is closed, the second valve 32 is opened, and the third valve 33 is closed, the oil supply pipeline 3 is in the first state; at this time, the hydraulic oil can enter from the first oil port 36 and directly flow into the rodless cavity of the first oil cylinder 1, push the rod to extend, squeeze the rod cavity of the first oil cylinder 1, and the oil in the rod cavity of the first oil cylinder 1 flows back to the second oil port 37 through the second valve 32. Or, the hydraulic oil can enter from the second oil port 37 and flow into the rod cavity of the first oil cylinder 1 through the second valve 32, push the rod to retract, squeeze the rodless cavity of the first oil cylinder 1, and the oil in the rodless cavity of the first oil cylinder 1 flows back to the first oil port 36.

When the first valve 31 is opened, the second valve 32 is closed, and the third valve 33 is opened, the oil supply pipeline 3 is in the second state; at this time, the hydraulic oil can enter from the first oil port 36, and flow into the rodless chamber of the second oil cylinder 2 through the first valve 31 and the third valve 33, push the rod to extend, squeeze the rod chamber of the second oil cylinder 2, and the oil in the rod chamber of the second oil cylinder 2 flows back to the second oil port 37. Alternatively, the hydraulic oil can enter from the second oil port 37 and directly flow into the rod chamber of the second oil cylinder 2, push the rod to retract, squeeze the rodless chamber of the second oil cylinder 2, and the oil in the rodless chamber of the second oil cylinder 2 flows back to the first oil port 36 through the third valve 33 and the first valve 31.

When the first valve 31 is closed, the second valve 32 is closed, and the third valve 33 is opened, the oil supply pipeline 3 is in the third state. At this time, the hydraulic oil can enter from the first oil port 36 and directly flow into the rodless chamber of the first oil cylinder 1, pushing the rod to extend and squeezing the rod chamber of the first oil cylinder 1. The oil in the rod chamber of the first oil cylinder 1 flows into the rodless chamber of the second oil cylinder 2 through the third valve 33, pushing the rod to extend and squeezing the rod chamber of the second oil cylinder 2. The oil in the rod chamber of the second oil cylinder 2 flows back to the second oil port 37, so that the rods of the first oil cylinder 1 and the second oil cylinder 2 are synchronously extended. Alternatively, the hydraulic oil can flow directly from the second oil port 37 into the rod chamber of the second cylinder 2, pushing the rod to retract and squeezing the rodless chamber of the second cylinder 2. The oil in the rodless chamber of the second cylinder 2 flows into the rod chamber of the first cylinder 1 through the third valve 33, pushing the rod to retract and squeezing the rodless chamber of the first cylinder 1. The oil in the rodless chamber of the first cylinder 1 flows back to the first oil port 36, causing the rods of the first cylinder 1 and the second cylinder 2 to retract synchronously.

In the present disclosure, the first valve 31, the second valve 32 and the third valve 33 may be solenoid valves. The solenoid valves may change their open and closed states under the control of electrical signals. Based on this, when the first valve 31, the second valve 32 and the third valve 33 are solenoid valves, the oil supply pipeline 3 may be switched between the first state, the second state and the third state by electrical signals.

3 , the second specific structure of the oil supply pipeline 3 is as follows.

The oil supply pipeline 3 includes a first oil port 36, a second oil port 37, a first valve 31, a second valve 32, and a fourth valve 34. The first oil port 36 is connected to the rodless chamber of the first oil cylinder 1, and the first oil port 36 is connected to the rod chamber of the first oil cylinder 1 through the first valve 31. The second oil port 37 is connected to the rod chamber of the first oil cylinder 1 through the second valve 32, and the second oil port 37 is connected to the rod chamber of the second oil cylinder 2 through the fourth valve 34, and the rod chamber of the first oil cylinder 1 is connected to the rodless chamber of the second oil cylinder 2.

In actual application, when the first valve 31 is closed, the second valve 32 is opened, and the fourth valve 34 is closed, the oil supply pipeline 3 is in the first state; at this time, the hydraulic oil can enter from the first oil port 36 and directly flow into the rodless cavity of the first oil cylinder 1, push the rod to extend, squeeze the rod cavity of the first oil cylinder 1, and the oil in the rod cavity of the first oil cylinder 1 flows back to the second oil port 37 through the second valve 32. Or, the hydraulic oil can enter from the second oil port 37 and flow into the rod cavity of the first oil cylinder 1 through the second valve 32, push the rod to retract, squeeze the rodless cavity of the first oil cylinder 1, and the oil in the rodless cavity of the first oil cylinder 1 flows back to the first oil port 36.

When the first valve 31 is opened, the second valve 32 is closed, and the fourth valve 34 is opened, the oil supply pipeline 3 In the second state; at this time, the hydraulic oil can enter from the first oil port 36, flow into the rodless chamber of the second oil cylinder 2 through the first valve 31, push the rod to extend, squeeze the rod chamber of the second oil cylinder 2, and the oil in the rod chamber of the second oil cylinder 2 flows back to the second oil port 37 through the fourth valve 34. Or, the hydraulic oil can enter from the second oil port 37, flow into the rod chamber of the second oil cylinder 2 through the fourth valve 34, push the rod to retract, squeeze the rodless chamber of the second oil cylinder 2, and the oil in the rodless chamber of the second oil cylinder 2 flows back to the first oil port 36 through the first valve 31.

When the first valve 31 is closed, the second valve 32 is closed, and the fourth valve 34 is opened, the oil supply pipeline 3 is in the third state. At this time, the hydraulic oil can enter from the first oil port 36 and directly flow into the rodless cavity of the first oil cylinder 1, pushing the rod to extend and squeezing the rod cavity of the first oil cylinder 1. The oil in the rod cavity of the first oil cylinder 1 flows into the rodless cavity of the second oil cylinder 2, pushing the rod to extend and squeezing the rod cavity of the second oil cylinder 2. The oil in the rod cavity of the second oil cylinder 2 flows back to the second oil port 37 through the fourth valve 34, so that the rods of the first oil cylinder 1 and the second oil cylinder 2 are synchronously extended. Alternatively, hydraulic oil can enter from the second oil port 37, flow into the rod chamber of the second oil cylinder 2 through the fourth valve 34, push the rod to retract, and squeeze the rodless chamber of the second oil cylinder 2. The oil in the rodless chamber of the second oil cylinder 2 flows into the rod chamber of the first oil cylinder 1, push the rod to retract, and squeeze the rodless chamber of the first oil cylinder 1. The oil in the rodless chamber of the first oil cylinder 1 flows back to the first oil port 36, so that the rods of the first oil cylinder 1 and the second oil cylinder 2 retract synchronously.

In the present disclosure, the first valve 31, the second valve 32 and the fourth valve 34 may be solenoid valves. The solenoid valves may change their own open and closed states under the control of electrical signals. Based on this, when the first valve 31, the second valve 32 and the fourth valve 34 are solenoid valves, the oil supply pipeline 3 may be switched between the first state, the second state and the third state by electrical signals.

4 , the third specific structure of the oil supply pipeline 3 is as follows.

The oil supply pipeline 3 includes a first oil port 36, a second oil port 37, a first valve 31, and a three-way valve 35; the first oil port 36 is connected to the rodless chamber of the first oil cylinder 1; the first oil port 36 is connected to the rod chamber of the first oil cylinder 1 through the first valve 31; the second oil port 37 is connected to the first opening 351 of the three-way valve 35; the second opening 352 of the three-way valve 35 is connected to the rod chamber of the first oil cylinder 1; the third opening 353 of the three-way valve 35 is connected to the rod chamber of the second oil cylinder 2; the rod chamber of the first oil cylinder 1 is connected to the rodless chamber of the second oil cylinder 2.

It should be noted that in the solution provided by the present disclosure, the three-way valve 35 can only be connected with two openings. The three openings cannot be connected.

In actual application, when the first valve 31 is closed and the first opening 351 of the three-way valve 35 is connected to the second opening 352, the oil supply pipeline 3 is in the first state; at this time, the hydraulic oil can enter from the first oil port 36 and directly flow into the rodless cavity of the first oil cylinder 1, push the rod to extend, squeeze the rod cavity of the first oil cylinder 1, and the oil in the rod cavity of the first oil cylinder 1 flows back to the second oil port 37 through the second opening 352 and the first opening 351 of the three-way valve 35. Or, the hydraulic oil can enter from the second oil port 37, flow into the rod cavity of the first oil cylinder 1 through the first opening 351 and the second opening 352 of the three-way valve 35, push the rod to retract, squeeze the rodless cavity of the first oil cylinder 1, and the oil in the rodless cavity of the first oil cylinder 1 flows back to the first oil port 36.

When the first valve 31 is opened and the first opening 351 of the three-way valve 35 is connected to the third opening 353, the oil supply pipeline 3 is in the second state; at this time, the hydraulic oil can enter from the first oil port 36, flow into the rodless chamber of the second oil cylinder 2 through the first valve 31, push the rod to extend, squeeze the rod chamber of the second oil cylinder 2, and the oil in the rod chamber of the second oil cylinder 2 flows back to the second oil port 37 through the third opening 353 and the first opening 351 of the three-way valve 35. Or, the hydraulic oil can enter from the second oil port 37, flow into the rod chamber of the second oil cylinder 2 through the first opening 351 and the third opening 353 of the three-way valve 35, push the rod to retract, squeeze the rodless chamber of the second oil cylinder 2, and the oil in the rodless chamber of the second oil cylinder 2 flows back to the first oil port 36 through the first valve 31.

When the first valve 31 is closed and the first opening 351 of the three-way valve 35 is connected to the third opening 353, the oil supply pipeline 3 is in the third state. At this time, the hydraulic oil can flow directly from the first oil port 36 into the rodless chamber of the first oil cylinder 1, pushing the rod to extend and squeezing the rod chamber of the first oil cylinder 1. The oil in the rod chamber of the first oil cylinder 1 flows into the rodless chamber of the second oil cylinder 2, pushing the rod to extend and squeezing the rod chamber of the second oil cylinder 2. The oil in the rod chamber of the second oil cylinder 2 flows back to the second oil port 37 through the third opening 353 and the first opening 351 of the three-way valve 35, so that the rods of the first oil cylinder 1 and the second oil cylinder 2 extend synchronously. Alternatively, the hydraulic oil can enter from the second oil port 37, pass through the first opening 351 and the third opening 353 of the three-way valve 35, and flow into the rod chamber of the second cylinder 2, pushing the rod to retract and squeezing the rodless chamber of the second cylinder 2. The oil in the rodless chamber of the second cylinder 2 flows into the rod chamber of the first cylinder 1, pushing the rod to retract and squeezing the rodless chamber of the first cylinder 1. The oil in the rodless chamber of the first cylinder 1 flows back to the first oil port 36, so that the rods of the first cylinder 1 and the second cylinder 2 retract synchronously.

In the present disclosure, the first valve 31 may be a solenoid valve, and the three-way valve 35 may be a two-position three-way solenoid valve. The solenoid valve and the two-position three-way solenoid valve may change their own open and closed states under the control of an electrical signal. Based on this, when the first valve 31 is a solenoid valve and the three-way valve 35 is a two-position three-way solenoid valve, the oil supply pipeline 3 may be controlled by an electrical signal to switch between the first state, the second state, and the third state.

In one embodiment, the oil cylinder system provided by the present disclosure further includes an oil supply module 4. The oil supply module 4 is connected to the first oil port 36 and the second oil port 37 respectively; the oil supply module 4 is used to supply hydraulic oil to the first oil port 36 and receive return oil from the second oil port 37, or to supply hydraulic oil to the second oil port 37 and receive return oil from the first oil port 36.

With such a configuration, the extension and retraction of the rod of the first oil cylinder 1 and/or the second oil cylinder 2 can be controlled based on the oil supply mode of the oil supply module 4. As shown in Fig. 2, Fig. 3 and Fig. 4, when the oil supply module 4 supplies hydraulic oil to the first oil port 36 and receives the return oil from the second oil port 37, the extension of the rod of the first oil cylinder 1 and/or the second oil cylinder 2 can be controlled; when the oil supply module 4 supplies hydraulic oil to the second oil port 37 and receives the return oil from the first oil port 36, the retraction of the rod of the first oil cylinder 1 and/or the second oil cylinder 2 can be controlled.

Example boom

The present disclosure also provides a crane arm, which includes the oil cylinder system provided by the present disclosure. With such a configuration, when the crane arm needs to use two oil cylinders to move synchronously, the oil supply pipeline is controlled to be in the third state, and the oil supply pipeline guides oil to drive the first oil cylinder and the second oil cylinder to move synchronously. As the synchronous movement proceeds, if an error occurs in the synchronous movement of the first oil cylinder and the second oil cylinder, the oil supply pipeline can be switched to the first state or the second state, and the first oil cylinder or the second oil cylinder can be controlled to move alone, so as to eliminate the error in the synchronization process of the first oil cylinder and the second oil cylinder, and improve the synchronization of the two oil cylinders when working.

Example crane

The present disclosure provides a crane, which includes the boom provided by the present disclosure. When the crane controls the boom to move, if two oil cylinders of the boom need to move synchronously, the oil supply pipeline can be controlled to be in a third state, and the oil supply pipeline guides oil to drive the first oil cylinder and the second oil cylinder to move synchronously. As the synchronous movement proceeds, if there is an error in the synchronization of the first oil cylinder and the second oil cylinder, the oil supply pipeline can be switched to the first state or the second state, and the first oil cylinder or the second oil cylinder can be controlled to move independently, so as to eliminate the error in the synchronization process of the first oil cylinder and the second oil cylinder, and improve the synchronization of the two oil cylinders when working.

The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

A cylinder system, characterized in that it comprises: a first cylinder, a second cylinder and an oil supply pipeline;

The oil supply pipeline is connected to the first oil cylinder and the second oil cylinder respectively;

The rod chamber of the first oil cylinder is connected to the rodless chamber of the second oil cylinder through the oil supply pipeline, or the rod chamber of the first oil cylinder is directly connected to the rodless chamber of the second oil cylinder, wherein

When the oil supply pipeline is in the first state, the oil supply pipeline is used to guide the hydraulic oil to drive the first oil cylinder to move independently;

When the oil supply pipeline is in the second state, the oil supply pipeline is used to guide the hydraulic oil to drive the second oil cylinder to move independently;

When the oil supply pipeline is in the third state, the oil supply pipeline is used to guide the hydraulic oil to drive the first oil cylinder and the second oil cylinder to move synchronously.
The oil cylinder system according to claim 1, characterized in that the oil supply pipeline comprises: a first oil port, a second oil port, a first valve, a second valve, and a third valve;

The first oil port is connected to the rodless chamber of the first oil cylinder;

The first oil port is connected to the rod chamber of the first oil cylinder through the first valve;

The first oil port is connected to the rodless chamber of the second oil cylinder by sequentially passing through the first valve and the third valve;

The second oil port is connected to the rod chamber of the first oil cylinder through the second valve;

The second oil port is connected to the rod chamber of the second oil cylinder;

The rod chamber of the first oil cylinder is connected to the rodless chamber of the second oil cylinder through the third valve;

The rod chamber of the first oil cylinder is connected to the rodless chamber of the second oil cylinder through the third valve;

When the first valve is closed, the second valve is opened, and the third valve is closed, the oil supply pipeline is in a first state;

When the first valve is opened, the second valve is closed, and the third valve is opened, the oil supply pipeline is in a second state;

When the first valve is closed, the second valve is closed, and the third valve is opened, the oil supply pipeline is in a third state.
The oil cylinder system according to claim 2, characterized in that the first valve, the second valve and the third valve are solenoid valves.
The oil cylinder system according to claim 1, characterized in that the oil supply pipeline comprises: a first oil port, a second oil port, a first valve, a second valve, and a fourth valve;

The first oil port is connected to the rodless chamber of the first oil cylinder;

The first oil port is connected to the rod chamber of the first oil cylinder through the first valve;

The second oil port is connected to the rod chamber of the first oil cylinder through the second valve;

The second oil port is connected to the rod chamber of the second oil cylinder through the fourth valve;

The rod chamber of the first oil cylinder is connected to the rodless chamber of the second oil cylinder;

When the first valve is closed, the second valve is opened, and the fourth valve is closed, the oil supply pipeline is in a first state;

When the first valve is open, the second valve is closed, and the fourth valve is open, the oil supply pipeline is in a second state;

When the first valve is closed, the second valve is closed, and the fourth valve is opened, the oil supply pipeline is in a third state.
The oil cylinder system according to claim 4, characterized in that the first valve, the second valve and the fourth valve are solenoid valves.
The oil cylinder system according to claim 1, characterized in that the oil supply pipeline comprises: a first oil port, a second oil port, a first valve, and a three-way valve;

The first oil port is connected to the rodless chamber of the first oil cylinder;

The first oil port is connected to the rod chamber of the first oil cylinder through the first valve;

The second oil port is connected to the first opening of the three-way valve;

The second opening of the three-way valve is connected to the rod chamber of the first oil cylinder;

The third opening of the three-way valve is connected to the rod chamber of the second oil cylinder;

The rod chamber of the first oil cylinder is connected to the rodless chamber of the second oil cylinder;

When the first valve is closed and the first opening of the three-way valve is connected to the second opening, the oil supply pipeline is in a first state;

When the first valve is opened and the first opening of the three-way valve is connected to the third opening, the oil supply pipeline is in the second state;

When the first valve is closed and the first opening of the three-way valve is connected to the third opening, the oil supply pipeline is in a third state.
The oil cylinder system according to claim 6 is characterized in that the first valve is a solenoid valve, and the three-way valve is a two-position three-way solenoid valve.
The oil cylinder system according to any one of claims 2 to 4, characterized in that it also includes an oil supply module;

The oil supply module is connected to the first oil port and the second oil port respectively;

The oil supply module is used to supply hydraulic oil to the first oil port and receive return oil from the second oil port, or to supply hydraulic oil to the second oil port and receive return oil from the first oil port.
A lifting arm, characterized by comprising: the cylinder system according to any one of claims 1 to 8.
A crane, characterized by comprising: the lifting arm as claimed in claim 9.