CN218148627U

CN218148627U - Semi-variable confluence hydraulic system of loader

Info

Publication number: CN218148627U
Application number: CN202221884028.2U
Authority: CN
Inventors: 黄庆佳; 胡育钦; 陈江平
Original assignee: Xiamen XGMA Machinery Co Ltd
Current assignee: Xiamen XGMA Machinery Co Ltd
Priority date: 2022-07-20
Filing date: 2022-07-20
Publication date: 2022-12-27
Anticipated expiration: 2032-07-20

Abstract

The utility model discloses a semi-variable confluence hydraulic system of a loader, which comprises an oil tank, a variable pump, a gear pump, an unloading valve, a flow amplifying valve, a control valve, a steering gear, a pressure reducing valve, a pilot oil supply valve, a control switch, a pilot valve, a shuttle valve, a multi-way valve, a movable arm oil cylinder, a rotating bucket oil cylinder and a steering oil cylinder; the oil outlet of the gear pump is connected with the multi-way valve through an unloading valve, the variable pump is converged with the gear pump through a flow amplifying valve and supplies oil to the multi-way valve, the oil outlet of the variable pump is connected with a pressure reducing valve, the flow amplifying valve and a pilot oil supply valve, the pressure reducing valve is connected with the flow amplifying valve through a steering gear, the flow amplifying valve is connected with a rodless cavity of a steering oil cylinder, a control valve is connected with the variable pump and controls the flow of the variable pump, and the multi-way valve is connected with the rodless cavities of a movable arm oil cylinder and a rotating bucket oil cylinder. Because the utility model discloses a control the output pressure of pilot valve, the shuttle valve then feeds back pilot pressure signal to the control valve, and the control valve control variable pump confluence flow reduces the meso position bypass energy consumption extravagant.

Description

Semi-variable confluence hydraulic system of loader

Technical Field

The utility model relates to a hydraulic system especially relates to a half variable confluence hydraulic system of loader.

Background

The loader is a widely-used engineering machine, and the complexity of the operation of a hydraulic system is determined by different purposes and complex working conditions. The common loader hydraulic system at present mainly comprises a double-quantitative pump system, a combination system of a quantitative pump and a variable pump, a double-variable pump system and the like. As shown in fig. 1, chinese patent CN201520332609.9, a fixed variable hydraulic system for a loader based on flow amplification steering includes a hydraulic oil tank 1', a variable pump 2', a steering gear 3', a right limit valve 4', a left limit valve 5', a flow amplification valve 6', a left steering cylinder 7', a right steering cylinder 8', a flow control valve block 9', an accumulator 10', a distribution valve 11', a dump cylinder 12', a boom cylinder 13', a pilot valve 14', an unloading valve block 17', a fixed displacement pump 18', a working mode switching solenoid valve 19', and a working mode switching switch 30', and a pilot opening pressure of a double-pump confluence of the loader system is set by the flow control valve block 9', that is, each handle action corresponds to the same opening pressure, so that in order to meet a certain action working speed, the opening pressure needs to be reduced, the double-pump confluence is caused in advance during other actions, and the flow is caused to bypass from the middle position, thereby wasting energy.

Disclosure of Invention

An object of the utility model is to provide a half variable confluence hydraulic system of loader that the energy consumption is low, work efficiency is high.

In order to achieve the above object, the technical solution of the present invention is:

the utility model relates to a loader semi-variable confluence hydraulic system, which comprises an oil tank, a variable pump, a gear pump, an unloading valve, a flow amplifying valve, a control valve, a steering gear, a pressure reducing valve, a pilot oil supply valve, a control switch, a pilot valve, a shuttle valve, a multi-way valve, a movable arm oil cylinder, a rotating bucket oil cylinder and a steering oil cylinder;

an oil suction port of the gear pump is connected with an oil tank, an oil outlet of the gear pump is connected with the multi-way valve through an unloading valve, an oil suction port of the variable pump is connected with the oil tank, one oil outlet of the variable pump is simultaneously connected with a port P of a flow amplifying valve, a port P1 of a reducing valve, a pilot oil supply valve and a port P3 of a control valve, an port EF of the flow amplifying valve is connected with an oil path between the unloading valve and the multi-way valve to form confluence of the variable pump and the gear pump and supply oil to the multi-way valve, an oil outlet P2 of the reducing valve is connected with a port a and a port B of the flow amplifying valve through a steering gear, a port A and a port B of the flow amplifying valve are connected with a rodless cavity of a steering oil cylinder, the pilot oil supply valve is connected with the port P of the pilot valve through a control switch, oil outlets c1 and c2 of the pilot valve are connected with oil inlets a1 and a2 of a shuttle valve to control the action of a rotating bucket oil cylinder, and an oil outlet c3 and c4 of the pilot valve to control the action of a movable arm of the oil cylinder; an oil inlet p1 of the control valve is connected with an oil outlet c of the shuttle valve to collect a pressure signal from the shuttle valve, an oil outlet p4 of the control valve is connected with an oil inlet of the variable pump to control the flow of the variable pump, the other two oil outlets p5 and p2 of the control valve are respectively connected with an LS port of the flow amplifying valve and an LS port of the steering gear, a T port of the control valve is connected with a T port of the flow amplifying valve, other oil outlets of the shuttle valve are connected with oil inlets a1, b1, a2 and b2 of the multi-way valve, and oil outlets of the multi-way valve are respectively connected with rodless cavities of the movable arm oil cylinder and the rotating bucket oil cylinder. The oil return filter is arranged on an oil return pipeline of the oil tank, and the bypass is connected to the oil return filter in a bypassing mode.

The utility model also comprises an oil return filter and a bypass; the oil return filter is arranged on an oil return pipeline of the oil tank, and the bypass is connected to the oil return filter in a bypassing mode.

After the scheme is adopted, the utility model comprises an oil tank, a variable pump, a gear pump, an unloading valve, a flow amplifying valve, a control valve, a steering gear, a pressure reducing valve, a pilot oil supply valve, a control switch, a pilot valve, a shuttle valve, a multi-way valve, a movable arm oil cylinder, a rotating bucket oil cylinder and a steering oil cylinder; through the output pressure of adjustment control pilot valve, the shuttle valve then feeds back pilot pressure signal to the control valve, and control valve control variable pump confluence flow reduces meso position bypass energy consumption extravagant, and accessible control variable pump and gear pump converge with maximum discharge capacity, and fast work improves work efficiency, in addition, the utility model discloses a control the off-load through pressure signal, the structure is comparatively simple, has avoided high pressure off-load, overflow loss, meso position bypass loss, throttle loss, reduces hydraulic system calorific capacity, reduces and uses the energy consumption, improves the hydraulic component reliability, has reduced complete machine use cost.

The invention will be further described with reference to the accompanying drawings and specific embodiments.

Drawings

FIG. 1 is a schematic diagram of a conventional loader fixed variable hydraulic system;

fig. 2 is a schematic diagram of the hydraulic system of the present invention.

Detailed Description

As shown in fig. 2, the utility model relates to a loader semi-variable confluence hydraulic system, including oil tank 1, variable pump 2, gear pump 3, unloading valve 4, flow amplification valve 5, control valve 6, steering gear 7, relief valve 8, guide's fuel feeding valve 9, control switch 10, pilot valve 11, shuttle valve 12, multiple unit valve 13, swing arm cylinder 14, rotary bucket cylinder 15, steering cylinder 16, oil return filter 17 and bypass 18.

An oil suction port of the gear pump 3 is connected with the oil tank 1, an oil outlet of the gear pump 3 is connected with the multi-way valve 13 through the unloading valve 4, an oil suction port of the variable pump 2 is connected with the oil tank 1, an oil outlet of the variable pump 2 is simultaneously connected with a port P of the flow amplifying valve 5, a port P1 of the reducing valve 8, a port P3 of the pilot oil supply valve 9 and the control valve 6, an EF port of the flow amplifying valve 5 is connected with an oil path between the unloading valve 4 and the multi-way valve 13 to form confluence of the variable pump 2 and the gear pump 3 and supply oil to the multi-way valve 13, an oil outlet P2 of the reducing valve 8 is connected with ports a and B of the flow amplifying valve 5 through the steering gear 7, a port and B of the flow amplifying valve 5 are connected with a rodless cavity of the steering oil cylinder 16, the pilot oil supply valve 9 is connected with a port P of the pilot valve 11 through the control switch 10, oil outlets c1 and c2 of the pilot valve 11 are connected with oil inlets a1 and a2 of the shuttle valve 12 for controlling the action of the rotating bucket oil cylinder 15, an oil outlet c3 and c4 of the pilot arm 11 are connected with an oil inlet of the shuttle valve 12 and an oil cylinder 14 for controlling action of the rotating bucket oil cylinder 14; an oil inlet p1 of the control valve 6 is connected with an oil outlet c of the shuttle valve 12 to collect a pressure signal from the shuttle valve 12, an oil outlet p4 of the control valve 6 is connected with an oil inlet of the variable pump 2 to control the flow of the variable pump 2, the other two oil outlets p5 and p2 of the control valve 6 are respectively connected with an LS port of the flow amplifying valve 5 and an LS port of the steering gear 7, a T port of the control valve 6 is connected with a T port of the flow amplifying valve 5, the other oil outlets of the shuttle valve 12 are connected with oil inlets a1, b1, a2 and b2 of the multi-way valve 13, and an oil outlet of the multi-way valve 13 is respectively connected with rodless cavities of the movable arm oil cylinder 14 and the rotating bucket oil cylinder 15. The return oil filter 17 is arranged on a return oil pipeline of the oil tank 1, and the bypass 18 is connected to the return oil filter 17 in a bypassing mode.

The utility model discloses a theory of operation:

the utility model discloses a turn to hydraulic system that hydraulic system comprises variable pump 2, flow amplification valve 5, steering gear 7, relief pressure valve 8, control valve 6 and steering cylinder 16. The variable displacement pump 2 supplies oil according to the requirements of steering speed and angle change during steering, and high-pressure signal oil output by the steering gear 7 and high-pressure oil output by the flow amplifying valve 5 enter the steering oil cylinder 16 to participate in steering, so that energy consumption loss is reduced.

The working hydraulic system is a confluence hydraulic system consisting of a gear pump 3, an unloading valve 4, a pilot oil supply valve 9, a pilot handle (not shown in the figure), a shuttle valve 12, a control valve 6, a distribution valve, a boom cylinder 14, a rotating bucket cylinder 15, a flow amplifying valve 5 and a variable pump 2. When the pressure of the working system is higher, the high-pressure small flow can meet the normal operation of the system, and the working quantitative gear pump 3 avoids high-pressure overflow loss through low-pressure unloading.

The output pressure of the pilot valve 11 is 0 to Px bar, the opening pressure of the control valve 6 is Py bar (0 is Py and is Px), and as long as the handle is slightly moved (the output pressure of the pilot valve 11 is less than Py bar), the shuttle valve 12 feeds a pilot pressure signal back to the control valve 6, the pilot signal pressure is less than the opening pressure of the control valve 6, the control valve 6 is not opened, and the minimum displacement of the variable displacement pump 2 works. If the handle is moved greatly (the output pressure of the pilot valve 11 is greater than Pybar), the shuttle valve 12 feeds back the pilot pressure signal to the control valve 6, at the moment, the pilot signal pressure is greater than the opening pressure of the control valve 6, the valve core of the control valve 6 moves to the left, and the variable displacement pump 2 merges at the maximum displacement. Therefore, when the handle is slightly moved (the expected working speed is lower), the interflow flow of the variable pump 2 can be reduced, and the energy consumption waste of the middle bypass is reduced. When the handle is greatly operated (the expected operating speed is high), the variable pump 2 and the gear pump 3 are converged at the maximum displacement, and the handle can be rapidly operated.

The above description is only a preferred embodiment of the present invention, and therefore, the scope of the present invention should not be limited by the above description, and all equivalent changes and modifications made in the claims and the description of the present invention should be covered by the present invention.

Claims

1. The utility model provides a loader semivariable confluence hydraulic system which characterized in that: the hydraulic control system comprises an oil tank, a variable pump, a gear pump, an unloading valve, a flow amplifying valve, a control valve, a steering gear, a pressure reducing valve, a pilot oil supply valve, a control switch, a pilot valve, a shuttle valve, a multi-way valve, a movable arm oil cylinder, a rotating bucket oil cylinder and a steering oil cylinder;

an oil suction port of the gear pump is connected with an oil tank, an oil outlet of the gear pump is connected with the multi-way valve through an unloading valve, an oil suction port of the variable pump is connected with the oil tank, one oil outlet of the variable pump is simultaneously connected with a port P of a flow amplifying valve, a port P1 of a reducing valve, a pilot oil supply valve and a port P3 of a control valve, an port EF of the flow amplifying valve is connected with an oil path between the unloading valve and the multi-way valve to form confluence of the variable pump and the gear pump and supply oil to the multi-way valve, an oil outlet P2 of the reducing valve is connected with a port a and a port B of the flow amplifying valve through a steering gear, a port A and a port B of the flow amplifying valve are connected with a rodless cavity of a steering oil cylinder, the pilot oil supply valve is connected with the port P of the pilot valve through a control switch, oil outlets c1 and c2 of the pilot valve are connected with oil inlets a1 and a2 of a shuttle valve to control the action of a rotating bucket oil cylinder, and an oil outlet c3 and c4 of the pilot valve to control the action of a movable arm of the oil cylinder; an oil inlet p1 of the control valve is connected with an oil outlet c of the shuttle valve to collect a pressure signal from the shuttle valve, an oil outlet p4 of the control valve is connected with an oil inlet of the variable pump to control the flow of the variable pump, the other two oil outlets p5 and p2 of the control valve are respectively connected with an LS port of the flow amplifying valve and an LS port of the steering gear, a T port of the control valve is connected with a T port of the flow amplifying valve, other oil outlets of the shuttle valve are connected with oil inlets a1, b1, a2 and b2 of the multi-way valve, and oil outlets of the multi-way valve are respectively connected with rodless cavities of the movable arm oil cylinder and the rotating bucket oil cylinder.

2. The semi-variable converging hydraulic system of a loader of claim 1, characterized in that: the system also comprises an oil return filter and a bypass; the oil return filter is arranged on an oil return pipeline of the oil tank, and the bypass is connected to the oil return filter in a bypass mode.