阅读说明：本技术 一种起重臂伸臂油缸伸出系统及方法 (System and method for extending oil cylinder of boom ) 是由 曹立峰 焦国旺 袁丛林 杜建西 于 2019-10-25 设计创作，主要内容包括：本发明公开了一种起重臂伸臂油缸伸出系统,包括第一油口、第二油口以及伸缩油缸,所述第一油口依次连接A油口、C油口、A1油口、伸缩油缸的无杆腔油口,所述第二油口依次连接、B油口、D油口、B1油口、伸缩油缸的有杆腔油口,所述第一油口与第二油口之间设有差动阀。一种起重臂伸臂油缸伸出方法；本发明快速伸臂系统,既保留了现有的伸缩臂的方式,能够适应吊臂小角度伸臂和伸臂困难的情况,又具有快速伸臂的功能,适应伸缩油缸无负载和负载较小时的快速运动,提高伸缩臂的速度。(The invention discloses a boom extension oil cylinder extension system which comprises a first oil port, a second oil port and a telescopic oil cylinder, wherein the first oil port is sequentially connected with an oil port A, an oil port C, an oil port A1 and a rodless cavity oil port of the telescopic oil cylinder, the second oil port is sequentially connected with an oil port B, an oil port D, an oil port B1 and a rod cavity oil port of the telescopic oil cylinder, and a differential valve is arranged between the first oil port and the second oil port. A method for extending an arm extending oil cylinder of a crane arm; the rapid boom extending system not only keeps the existing boom extending mode, can adapt to the situations of small-angle boom extending and boom extending difficulty of the boom, but also has the function of rapidly extending the boom, adapts to rapid movement of a telescopic oil cylinder when no load and a small load exist, and improves the speed of the telescopic boom.)

1. The utility model provides a jib loading boom hydro-cylinder stretches out system, its characterized in that includes first hydraulic fluid port, second hydraulic fluid port and flexible hydro-cylinder, the rodless chamber hydraulic fluid port of A hydraulic fluid port, C hydraulic fluid port, A1 hydraulic fluid port, flexible hydro-cylinder is connected gradually to first hydraulic fluid port, the second hydraulic fluid port connect gradually, the B hydraulic fluid port, D hydraulic fluid port, B1 hydraulic fluid port, the pole chamber hydraulic fluid port that has of flexible hydro-cylinder, be equipped with the differential valve between first hydraulic fluid port and the second hydraulic fluid port.

2. The boom extension cylinder extension system of claim 1, wherein the differential valve comprises an electromagnetic directional valve, a hydraulic directional valve and a one-way valve, and the oil port a is connected with a control port of the hydraulic directional valve through the electromagnetic directional valve and the one-way valve.

3. The boom extension cylinder extension system of claim 2, wherein the port B is connected to the port D via a hydraulic directional valve port to the left.

4. The boom extension cylinder extension system of claim 2, wherein the differential valve further comprises a damper, one end of the damper is connected to the solenoid directional valve and the other end of the damper is connected to the hydraulic directional valve.

5. The boom cylinder extension system of claim 1, wherein the rod chamber end of the telescoping cylinder is provided with a balancing valve.

6. A method for extending a boom cylinder of a crane boom is characterized by comprising the following steps:

when the electromagnetic directional valve is electrified, the direction of an oil path extending out of the telescopic oil cylinder is as follows:

the telescopic oil cylinder extends out from the first oil port to a rodless cavity of the telescopic oil cylinder; one part of the hydraulic control valve is pushed to change direction by the right position of the electromagnetic change valve and the damping;

the return oil of the rod cavity of the telescopic oil cylinder flows to the rodless cavity of the telescopic oil cylinder through the check valve via the right position of the hydraulic reversing valve.

7. The method of claim 6, further comprising:

when the electromagnetic directional valve is not electrified, the direction of an oil path extending out of the telescopic oil cylinder is as follows:

the oil flows to a rodless cavity of the telescopic oil cylinder through the first oil port, and the telescopic oil cylinder extends out; return oil of a rod cavity of the telescopic oil cylinder flows back to the oil tank through the second oil port;

when the electromagnetic directional valve is not electrified, the direction of the oil path of the oil cylinder is as follows:

and the return oil enters the rod cavity of the telescopic oil cylinder from the second oil port through the left position of the hydraulic reversing valve, and the return oil of the rodless cavity of the telescopic oil cylinder flows back to the oil tank through the first oil port.

Technical Field

The invention relates to a method for extending an arm extending oil cylinder of a crane arm, and belongs to the technical field.

Background

The extending speed of a cargo boom is an important performance index of the automobile crane, and the extending method of the telescopic oil cylinder of the cargo boom of the existing automobile crane is as follows: high-pressure oil provided by the hydraulic pump enters the rodless cavity of the telescopic oil cylinder to push the oil cylinder to extend out, and hydraulic oil in the rod cavity directly returns to the oil tank. The extending speed of the boom extending out of the oil cylinder is determined by the flow of the pump and the area of a non-cylinder cavity of the telescopic oil cylinder. When the telescopic oil cylinder extends out in a no-load mode or with a small load, the extension pressure is not high, the maximum working capacity of an engine cannot be exerted, and the extension speed of a crane boom is limited to be improved.

A bucket cylinder control linkage and a movable arm cylinder control linkage of the existing excavator multi-way valve are provided with flow regeneration valve cores, and when a bucket is unloaded to be quickly lowered and a movable arm is quickly lowered, an oil cylinder is extended out in a differential mode. The pressure of the rod cavity of the oil cylinder is a small constant value, and when the pressure of the rodless cavity of the oil cylinder is larger than the constant pressure value of the rod cavity of the oil cylinder, return oil of the rod cavity cannot enter the rodless cavity and is driven in a non-differential mode.

Disclosure of Invention

The invention aims to provide a system and a method for extending an arm cylinder of a crane arm, which aim to overcome the defects that the working condition of a large load of the arm of an automobile crane cannot be met and the free switching between differential motion and non-differential motion cannot be realized in the prior art.

The utility model provides a jib loading boom hydro-cylinder stretches out system, includes first hydraulic fluid port, second hydraulic fluid port and flexible hydro-cylinder, the rodless chamber hydraulic fluid port of A hydraulic fluid port, C hydraulic fluid port, A1 hydraulic fluid port, flexible hydro-cylinder is connected gradually to first hydraulic fluid port, the second hydraulic fluid port connect gradually, the pole chamber hydraulic fluid port of B hydraulic fluid port, D hydraulic fluid port, B1 hydraulic fluid port, flexible hydro-cylinder, be equipped with the differential valve between first hydraulic fluid port and the second hydraulic fluid port.

Preferably, the differential valve comprises an electromagnetic reversing valve, a hydraulic reversing valve and a one-way valve, and the oil port A is connected with a control port of the hydraulic reversing valve through the electromagnetic reversing valve and the one-way valve.

Preferably, the oil port B is connected with the oil port D through the left position of the hydraulic reversing valve.

Preferably, the differential valve further comprises a damper, one end of the damper is connected with the electromagnetic reversing valve, and the other end of the damper is connected with the hydraulic reversing valve.

Preferably, a balance valve is arranged at the rod cavity end of the telescopic oil cylinder.

A method for extending a boom cylinder of a crane boom is characterized by comprising the following steps:

when the electromagnetic directional valve is electrified, the direction of an oil path extending out of the telescopic oil cylinder is as follows:

the telescopic oil cylinder extends out from the first oil port to a rodless cavity of the telescopic oil cylinder; one part of the hydraulic control valve is pushed to change direction by the right position of the electromagnetic change valve and the damping;

the return oil of the rod cavity of the telescopic oil cylinder flows to the rodless cavity of the telescopic oil cylinder through the check valve via the right position of the hydraulic reversing valve.

Preferably, the method further comprises:

when the electromagnetic directional valve is not electrified, the direction of an oil path extending out of the telescopic oil cylinder is as follows:

the oil flows to a rodless cavity of the telescopic oil cylinder through the first oil port, and the telescopic oil cylinder extends out; return oil of a rod cavity of the telescopic oil cylinder flows back to the oil tank through the second oil port;

when the electromagnetic directional valve is not electrified, the direction of the oil path of the oil cylinder is as follows:

and the return oil enters the rod cavity of the telescopic oil cylinder from the second oil port through the left position of the hydraulic reversing valve, and the return oil of the rodless cavity of the telescopic oil cylinder flows back to the oil tank through the first oil port.

Compared with the prior art, the invention has the following beneficial effects: the rapid boom extending system not only keeps the existing boom extending mode, can adapt to the situations of small-angle boom extending and boom extending difficulty of the boom, but also has the function of rapidly extending the boom, adapts to rapid movement of a telescopic oil cylinder when no load and a small load exist, and improves the speed of the telescopic boom.

By adding the design of a differential valve, the telescopic arm system of the automobile crane has the existing function, and the telescopic oil cylinder has the function of extending out in a differential mode. Meanwhile, due to the structural design of the differential valve, the pressure of a rodless cavity of the telescopic oil cylinder can be increased only after the telescopic oil cylinder moves, and the telescopic balance valve can be opened, so that the phenomenon of backward contraction of the telescopic oil cylinder can be avoided when the telescopic oil cylinder stretches.

When the telescopic arm does not act, the rodless cavity of the telescopic oil cylinder is in a pressure relief state, the piston of the rod cavity of the telescopic oil cylinder is free from oil pressure, and the acting force of the hydraulic oil pressure of the rodless cavity of the telescopic oil cylinder on the piston is the acting force of the telescopic oil cylinder on an external load, so that the load bearing capacity of the conventional telescopic oil cylinder is ensured.

Drawings

Fig. 1 is a schematic diagram of the operation of the present invention.

In the figure: 1. an electromagnetic directional valve; 2. a hydraulically operated directional control valve; 3. damping; 4. a one-way valve; 5. a balancing valve; 6. a telescopic oil cylinder; 7. a differential valve; 8. a first oil port; 9. a second oil port.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

In a first aspect: as disclosed in fig. 1, a boom extension cylinder stretching system comprises a first oil port 8, a second oil port 9 and a telescopic cylinder 6, the first oil port 8 is connected with the oil port a, the oil port C, the oil port a1 and the rodless cavity oil port of the telescopic cylinder 6 in sequence, the second oil port 9 is connected with the rod cavity oil port of the telescopic cylinder 6 in sequence, the oil port B, the oil port D, the oil port B1 and the rod cavity oil port B, and a differential valve 7 is arranged between the first oil port 8 and the second oil port 9.

Differential valve 7 includes solenoid directional valve 1, 2 and check valve 4 of switching-over valve surges, the right side of solenoid directional valve 1 is connected with the A hydraulic fluid port, solenoid directional valve 1 is connected with switching-over valve 2 of surging through damping 3, the one end and the solenoid directional valve 1 of damping 3 are connected, and the other end is connected with switching-over valve 2 of surging. The right position of the hydraulic reversing valve 2 is connected with the oil port C through a one-way valve 4, and the oil port B is connected with the oil port D through the right position of the hydraulic reversing valve 2; the balance valve 5 is arranged at the rod cavity end of the telescopic oil cylinder 6, and the balance valve 5 can be opened during telescopic operation, so that the telescopic oil cylinder 6 is prevented from being retracted during cylinder extending operation.

In a second aspect: a method for extending an arm cylinder of a crane arm is disclosed, which comprises the following steps:

when the electromagnet Y1 in the electromagnetic reversing valve 1 is electrified, the electromagnetic reversing valve is a differential oil extending cylinder, the main valve is in telescopic connection reversing, oil is fed from the oil port A of the differential valve, oil is returned from the oil port B, and high-pressure oil from the oil port A pushes the hydraulic reversing valve 2 to reverse through the electromagnetic reversing valve 1 and the damper 3. When the pressure of the oil port A is increased to push the telescopic oil cylinder 6 to extend, the high-pressure oil of the oil port A enters the rodless cavity of the telescopic oil cylinder 6, and the return oil of the telescopic oil cylinder 6 enters the rodless cavity of the telescopic oil cylinder 6 after confluence of the high-pressure oil of the oil port A and the hydraulic reversing valve 2 and the one-way valve 4.

The direction of an oil path extending out of the telescopic oil cylinder is as follows:

the oil passes through the oil port A, the oil port C and the oil port A1 from the first oil port 8 to reach a rodless cavity of the telescopic oil cylinder 6, and the telescopic oil cylinder 6 extends out;

the return oil of the rod cavity of the telescopic oil cylinder 6 flows to the rodless cavity of the telescopic oil cylinder 6 through the oil port B1, the oil port D and the right check valve 4 of the hydraulic reversing valve 2, and is used for increasing the oil quantity of the rodless cavity and pushing the oil cylinder to extend out so as to improve the extension speed of the telescopic oil cylinder 6.

When the electromagnet Y1 in the electromagnetic directional valve 1 is not electrified, the electromagnetic directional valve is a non-differential extension oil cylinder: the electromagnet Y1 in the electromagnetic directional valve 1 is not electrified, the electromagnetic directional valve 1 does not change the direction, and the hydraulic directional valve 2 does not change the direction. After the main valve is in telescopic linkage reversing, the oil inlet of the oil port A passes through the oil outlet of the oil port C to enter the rodless cavity of the telescopic oil cylinder 6, and the telescopic oil cylinder 6 extends out. The return oil of the telescopic oil cylinder 6 sequentially passes through the oil port D and the oil port B and then returns to the oil tank through the second oil port 9.

The extending oil path direction of the telescopic oil cylinder 6 is as follows:

flows to the rodless cavity of the telescopic oil cylinder 6 through the first oil port 8 and the oil ports A1, and the telescopic oil cylinder 6 extends out; the return oil of the rod cavity of the telescopic oil cylinder 6 flows back to the oil tank through an oil port B1, an oil port D, a right position of the hydraulic reversing valve 2, an oil port B and a second oil port 9;

when the electromagnet Y1 in the electromagnetic directional valve 1 is not electrified, the telescopic oil cylinder is as follows: the electromagnet Y1 is de-energized and the hydraulically operated directional control valve 2 is not reversed. After the main valve is stretched and linked for reversing, high-pressure oil of the oil port B enters a rod cavity of the stretching oil cylinder 6 through the right position of the hydraulic reversing valve 2, and return oil of the rodless cavity flows back to an oil tank through the oil port C, the oil port A and the second oil port.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.