WO2022193769A1

WO2022193769A1 - Double-acting floating oil cylinder control loop

Info

Publication number: WO2022193769A1
Application number: PCT/CN2021/140758
Authority: WO
Inventors: 刘国良; 赵俊波
Original assignee: 湖南星邦智能装备股份有限公司
Priority date: 2021-03-19
Filing date: 2021-12-23
Publication date: 2022-09-22
Also published as: CN215058526U

Abstract

A double-acting floating oil cylinder control loop, comprising a double-acting hydraulic cylinder, a first balance valve, a second balance valve, and a locking device. One end of the first balance valve is connected to a rodless cavity of the double-acting hydraulic cylinder; one end of the second balance valve is connected to a rod cavity of the double-acting hydraulic cylinder, and the other end of the first balance valve is connected to the other end of the second balance valve; one end of the locking device is connected to the other end of the first balance valve and the other end of the second balance valve, and the other end of the locking device is connected to a pressure oil source; control ends of the first balance valve, the second balance valve, and the locking device are all connected to a control oil source. When the double-acting hydraulic cylinder is in a fixed state, the locking device can realize the second-layer locking of a hydraulic loop, and ensure to still lock the oilway in the hydraulic loop when a valve core of the first balance valve or the second balance valve blocks or the hydraulic oil leaks so as to prevent an oil cylinder from sliding.

Description

Double acting floating cylinder control circuit

This application claims the priority of the Chinese patent application filed on March 19, 2021 with the application number 202120571579.2 and the invention titled "Double-acting Floating Cylinder Control Circuit", the entire contents of which are incorporated herein by reference.

technical field

The invention relates to a hydraulic system for controlling a floating oil cylinder, in particular to a double-acting floating oil cylinder control circuit.

Background technique

The floating of the whole vehicle of the high-altitude platform is realized by adding a floating oil cylinder to the swing bridge. One end of the oil cylinder is connected to the frame, and the other end is connected or pressed on the swing bridge. An oil cylinder is installed at each end of a swing bridge. When the oil cylinder is double When the hydraulic cylinder is used, the swing of the swing bridge is realized by controlling the push or pull of the oil rod on one side of the swing bridge, or the pull or push of the oil cylinder on the other side of the swing bridge. When the required floating oil cylinder is activated, the control from the hydraulic control system The pressure oil opens the balance valve, the upper and lower oil ports of the oil cylinder are connected, and the power oil source replenishes a certain amount of oil in time to ensure that the oil cylinder moves quickly and adapts to the changes of the ground in time, so that the four wheels of the vehicle touch the ground and maintain a good driving force for walking.

In the related art, when the high-altitude platform is in working state, the method of locking the floating oil cylinder is generally adopted to ensure the safety of the whole machine, because the position of the oil cylinder changes during floating, and safety accidents such as tipping are prone to occur. Referring to Fig. 1, it can be seen that even if the control oil source 200 is not activated, the spool of the balance valve is stuck due to hydraulic cleanliness, or the spool wear caused by the long-term use of the balance valve will cause the failure of the balance valve and the hydraulic oil. Leakage, double-acting hydraulic cylinder 400 sliding problems, and these problems may lead to the overturning of the whole high-altitude platform and casualties.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a double-acting floating oil cylinder control circuit, which can solve the problems of hydraulic oil leakage caused by the wear of the balance valve spool and the sticking of the spool, and the sliding of the double-acting hydraulic cylinder.

A double-acting floating oil cylinder control circuit according to an embodiment of the present invention includes: a control oil source, a pressure oil source, a double-acting hydraulic cylinder, a first balance valve, a second balance valve and a locking device, wherein the first balance valve has a One end is connected with the oil port of the rodless cavity of the double-acting hydraulic cylinder; one end of the second balance valve is connected with the oil port of the rod-bearing cavity of the double-acting hydraulic cylinder; the other end of the first balance valve connected to the other end of the second balance valve, the first balance valve and the second balance valve are both connected to the pressure oil source through the locking device, the control end of the first balance valve, the The control end of the second balance valve and the control end of the locking device are both connected to the control oil source.

A double-acting floating oil cylinder control circuit according to an embodiment of the present invention has at least the following beneficial effects: in the embodiment of the present invention, by setting a double-acting hydraulic cylinder as a working device in the hydraulic circuit, The oil port is connected with one end of the first balance valve, the oil port of the rod cavity of the double-acting hydraulic cylinder is connected with one end of the second balance valve, and the other end of the first balance valve is communicated with the other end of the second balance valve, The other ends of the first balance valve and the second balance valve are connected with the pressure oil source through the locking device, and the control ends of the locking device, the first balance valve and the second balance valve are all connected with the control oil source; when the control oil source passes through the pressure oil When the locking device is in a connected state and the first balance valve and the second balance valve are in an open state, the rod chamber of the double-acting hydraulic cylinder is connected with the rodless chamber of the double-acting hydraulic cylinder, and the double-acting hydraulic cylinder is connected to the double-acting hydraulic cylinder through the pressure oil source. Hydraulic oil is replenished, and the double-acting hydraulic cylinder is in a floating state. When the control oil source is closed and the pressure oil source is closed, the locking device is in a locked state and the first balance valve and the second balance valve are in a closed state. At this time, the oil passage of the rodless cavity of the double-acting hydraulic cylinder is locked by the first balance valve. The oil passage of the rod cavity of the double-acting hydraulic cylinder is locked by the second balance valve, and the locking device is arranged between the first balance valve, the second balance valve and the pressure oil source, as the second heavy locking device. When the first balance valve or the second balance valve leaks, the locking device can still separate the oil circuit of the double-acting hydraulic cylinder from the pressure oil source, so as to ensure that the double-acting hydraulic cylinder is always in a locked state and prevent the double-acting hydraulic cylinder from sliding.

According to some embodiments of the present invention, the locking device is one, one end of the locking device is connected to the common end of the first balance valve and the second balance valve, and the other end of the locking device is connected to the common end of the first balance valve and the second balance valve. The pressure oil source is connected.

According to some embodiments of the present invention, the locking device includes a first locking device and a second locking device, the other end of the first balancing valve is connected to one end of the first locking device, and the second balancing valve is connected to one end of the first locking device. The other end is connected to one end of the second locking device, the other end of the first locking device is connected to the other end of the second locking device, and the pressure oil source is connected to the first locking device and the first locking device. The common ends of the two locking devices are connected.

According to some embodiments of the present invention, the locking device is a hydraulically controlled check valve, and an oil inlet of the hydraulically controlled check valve is connected to the pressure oil source.

According to some embodiments of the present invention, the blocking device is a hydraulically controlled reversing valve.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, wherein:

Fig. 1 is the hydraulic circuit of the original double-acting floating hydraulic cylinder of the embodiment of the present invention;

2 is a hydraulic circuit in which the locking device in the control circuit of the double-acting floating oil cylinder according to the embodiment of the present invention is a hydraulically controlled reversing valve.

3 is a hydraulic circuit in which the locking device of the control circuit of the double-acting floating oil cylinder according to the embodiment of the present invention is a hydraulically controlled check valve.

Reference number:

Pressure oil source 100, control oil source 200, first balance valve 300, double-acting hydraulic cylinder 400, rodless cavity 410, rod cavity 420, second balance valve 500, hydraulic control reversing valve 600, hydraulic control one-way valve 700.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention.

In the description of the present invention, reference to the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" or the like is meant to be used in conjunction with the embodiment. A particular feature, structure, material, or characteristic described or exemplified is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to FIG. 2 , a double-acting floating oil cylinder control circuit according to an embodiment of the present invention includes: a pressure oil source 100 , a control oil source 200 , a double-acting hydraulic cylinder 400 , a first balance valve 300 , and a second balance valve 500 and locking device, one end of the first balance valve 300 is connected with the oil port of the rodless cavity 410 of the double-acting hydraulic cylinder 400, and one end of the second balance valve 500 is connected with the oil port of the rod-bearing cavity 420 of the double-acting hydraulic cylinder 400, When the double-acting hydraulic cylinder 400 is in a floating state, the first balance valve 300 is in an open state under the action of the controlled oil source 200 , the hydraulic oil at both ends of the first balance valve 300 is conducted, and the second balance valve 500 is under the action of the controlled oil source 200 in an open state. In the open state, the hydraulic oil at both ends of the second balance valve 500 is connected, and the other end of the first balance valve 300 and the other end of the second balance valve 500 communicate with each other, so that the oil port of the rod cavity 420 of the double-acting hydraulic cylinder 400 is connected to each other. It is connected with the oil port of the rodless cavity 410 to form a floating circuit capable of rapid action; the first balance valve 300 and the second balance valve 500 are connected to the pressure oil source 100 through the locking device, and the first balance valve 300 and the second balance valve 500 The control end of the locking device and the locking device are connected to the control oil source 200. When the control oil source 200 and the pressure oil source 100 are opened, the locking device is opened, the oil circuits at both ends of the locking device are connected, and the first balance valve 300 is opened. The balance valve 500 is also opened, the rod cavity 420 and the rodless cavity 410 of the double-acting hydraulic cylinder 400 are connected to form a floating circuit, and the pressure oil source 100 is the rod cavity 420 and the rodless cavity 410 of the double-acting hydraulic cylinder 400. The rod cavity 420 and the rodless cavity 410 supplement hydraulic oil ; When the control oil source 200 is closed and the pressure oil source 100 is closed, the first balance valve 300 is closed, and the oil circuits at both ends of the first balance valve 300 are closed, that is, the rodless cavity 410 of the double-acting hydraulic cylinder 400 to the pressure oil source 100. The oil circuit is cut off, the second balance valve 500 is closed, and the oil circuit at both ends of the second balance valve 500 is cut off, that is, the oil circuit from the rod chamber 420 of the double-acting hydraulic cylinder 400 to the pressure oil source 100 is cut off, and the locking device is closed at the same time. The oil passages at both ends are cut off, that is, the oil passage from the locking device to the pressure oil source 100 is cut off; the first balance valve 300 and the second balance valve 500 are respectively responsible for the oil in the rod cavity 420 and the rodless cavity 410 of the double-acting hydraulic cylinder 400 . The oil circuit forms the first layer of blocking, and the blocking device forms a second layer of blocking for the oil circuit of the rodless chamber 410 and the rod chamber 420 of the double-acting hydraulic cylinder 400. When the first balance valve 300 or the second balance valve 500 valve When the core is blocked or the hydraulic oil leaks, due to the existence of the second layer of blocking, that is, the blocking device, the oil circuit of the double-acting hydraulic cylinder 400 can still be blocked, so as to ensure that the cylinder does not slide, and the aerial platform operation vehicle does not tilt. Turnover accident.

There may be two locking devices, one end of the two locking devices is connected to the first balance valve 300 and the second balance valve 500 respectively, and the other ends of the two locking devices are connected, that is, the common end of the two locking devices is connected to the pressure oil Source 100; there may be only one locking device, one end of the locking device is connected to the common end of the first balance valve 300 and the second balance valve 500, and the other end of the locking device is connected to the pressure oil source 100; all of which belong to the present invention Protection range, whether it is one locking device or two locking devices, the control end of the locking device is connected to the control oil source 200 together with the control ends of the first balance valve 300 and the second balance valve 500; the following embodiments are all based on one A locking device is described as an example.

Referring to FIG. 2 , the locking device is a hydraulically controlled check valve 700. When the control oil source 200 is opened, the hydraulically controlled check valve 700 is opened, and the oil circuits at both ends of the hydraulically controlled check valve 700 are connected, so that the pressure oil source 100 can Supplement hydraulic oil for the double-acting hydraulic cylinder 400 in the floating state; when the control oil source 200 is closed, the hydraulic control check valve 700 is closed, and the oil circuits at both ends of the hydraulic control check valve 700 are closed, and the double-acting hydraulic cylinder in the fixed state is closed. The 400 forms a second layer of lock to prevent the double-acting hydraulic cylinder 400 from sliding due to blockage or leakage of the spool of the first balance valve 300 or the second balance valve 500 .

Next, referring to FIG. 3 , the locking device can also be a hydraulically controlled reversing valve 600 . When the control oil source 200 is turned on, the spool of the hydraulically controlled reversing valve 600 moves to the conducting position, and the two ends of the hydraulically controlled reversing valve 600 move to the conducting position. The oil circuit is turned on, so that the pressure oil source 100 can replenish hydraulic oil for the double-acting hydraulic cylinder 400 in the floating state; when the control oil source 200 is closed, the hydraulic control reversing valve 600 is closed, and the oil at both ends of the hydraulic control reversing valve 600 is closed. When the circuit is closed, a second layer of blocking is formed for the fixed double-acting hydraulic cylinder 400 to prevent the double-acting hydraulic cylinder 400 from sliding due to the blockage or leakage of the first balance valve 300 or the second balance valve 500 spool. Of course, in addition to the hydraulic control reversing valve 600 and the hydraulic control one-way valve 700, any hydraulic pressure capable of switching the oil circuit at both ends of the locking device between on and off states under the action of the control oil source 200 can be used in the locking device. Valves all belong to the protection scope of the present invention.

To sum up, the double-acting floating oil cylinder control circuit of the embodiment of the present invention is provided with a second layer of blocking to ensure that when the first balance valve 300 or the second balance valve 500 is blocked by the spool or the hydraulic oil leaks, it can still The hydraulic circuit of the double-acting hydraulic cylinder 400 is blocked to prevent the double-acting hydraulic cylinder 400 from sliding. The hydraulic control one-way valve 700 can cut off the oil circuits at both ends when the control oil source 200 is closed, and has a simple structure, which is convenient for realizing the second-layer blocking of the hydraulic circuit of the double-acting hydraulic cylinder 400 .

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the art, various Variety. Furthermore, the embodiments of the present invention and features in the embodiments may be combined with each other without conflict.

Claims

A double-acting floating oil cylinder control circuit, characterized in that it includes:

Pressure oil source (100);

Control oil source (200);

Double acting hydraulic cylinder (400);

a first balance valve (300), one end of the first balance valve (300) is connected to the oil port of the rodless cavity (410) of the double-acting hydraulic cylinder (400);

a second balance valve (500), one end of the second balance valve (500) is connected to the oil port of the rod cavity (420) of the double-acting hydraulic cylinder (400);

A locking device, the other end of the first balance valve (300) is communicated with the other end of the second balance valve (500), and both the first balance valve (300) and the second balance valve (500) pass through The locking device is connected to the pressure oil source (100), and the control end of the first balance valve (300), the control end of the second balance valve (500) and the control end of the locking device are all connected to The control oil source (200) is connected.
The double-acting floating oil cylinder control circuit according to claim 1, wherein the locking device is one, and one end of the locking device is connected to the first balance valve (300) and the second balance valve (500). ) is connected to the common end, and the other end of the locking device is connected to the pressure oil source (100).
The floating oil cylinder control circuit for a double-acting cylinder according to claim 1, characterized in that the blocking device comprises a first blocking device and a second blocking device, and the other end of the first balance valve (300) is connected to the first blocking device (300). One end of a locking device is connected to one end, the other end of the second balance valve (500) is connected to one end of the second locking device, and the other end of the first locking device is connected to the other end of the second locking device , the pressure oil source (100) is connected to the common end of the first locking device and the second locking device.
The floating oil cylinder control circuit for a double-acting cylinder according to claim 1, characterized in that the locking device is a hydraulically controlled check valve (700), and an oil inlet of the hydraulically controlled check valve (700) is connected to the A pressure oil source (100) is connected.
The floating oil cylinder control circuit for a double-acting cylinder according to claim 1, wherein the blocking device is a hydraulically controlled reversing valve (600).