阅读说明：本技术 一种大流量泵站的柔性加载和卸荷方法 (Flexible loading and unloading method for large-flow pump station ) 是由 王峰 陈金成 于 2021-07-22 设计创作，主要内容包括：本发明公开了一种大流量泵站的柔性加载和卸荷方法。包括液压支架和泵站,泵站的入口连接到油箱,泵站的出口和液压支架的进油口连通；液压泵组均设有电机、液压泵和过滤器；电机的输出轴和液压泵的输入轴连接,液压泵的进油端经过滤器和油箱连通,液压泵的输出端经单向阀输出；包括比例节流阀,液压泵的输出端经比例节流阀和油箱连通,通过控制比例节流阀的开度,实现液压泵组中液压泵的柔性加载和卸荷。本发明方法可有效地降低系统的液压冲击,提高系统的可靠性,增加泵站的寿命。(The invention discloses a flexible loading and unloading method for a large-flow pump station. The hydraulic support comprises a hydraulic support and a pump station, wherein an inlet of the pump station is connected to an oil tank, and an outlet of the pump station is communicated with an oil inlet of the hydraulic support; the hydraulic pump sets are provided with motors, hydraulic pumps and filters; the output shaft of the motor is connected with the input shaft of the hydraulic pump, the oil inlet end of the hydraulic pump is communicated with the oil tank through the filter, and the output end of the hydraulic pump is output through the one-way valve; the hydraulic pump set flexible loading and unloading device comprises a proportional throttle valve, wherein the output end of a hydraulic pump is communicated with an oil tank through the proportional throttle valve, and flexible loading and unloading of the hydraulic pump in the hydraulic pump set are realized by controlling the opening of the proportional throttle valve. The method can effectively reduce the hydraulic impact of the system, improve the reliability of the system and prolong the service life of the pump station.)

1. A flexible loading and unloading method of a large-flow pump station comprises a hydraulic support and the pump station, wherein an inlet of the pump station is connected to an oil tank (10), and an outlet of the pump station is communicated with an oil inlet of the hydraulic support; the hydraulic pump sets are provided with motors (2), hydraulic pumps and filters (4); an output shaft of the motor (2) is connected with an input shaft of the hydraulic pump (3), an oil inlet end of the hydraulic pump (3) is communicated with an oil tank (10) through a filter (4), and an output end of the hydraulic pump (3) is output through the one-way valve (1); the method is characterized in that: the flexible loading and unloading device is characterized by further comprising a proportional throttle valve (5), wherein the output end of the hydraulic pump (3) is communicated with an oil tank (10) through the proportional throttle valve (5), and flexible loading and unloading of the hydraulic pump (3) in the hydraulic pump set are achieved by controlling the opening of the proportional throttle valve (5).

2. The flexible loading and unloading method of the high-flow pump station according to claim 1, characterized in that: the pump station comprises a plurality of hydraulic pump sets which are connected in parallel, and the plurality of hydraulic pump sets are sequentially loaded and unloaded.

3. The flexible loading and unloading method of the high-flow pump station according to claim 1, characterized in that: the hydraulic pumps (A1, A2, … … and An) of each hydraulic pump group are sequentially loaded or unloaded, the pressure points of the loading or unloading of the hydraulic pumps (1, 2, … … and N) are sequentially P1, P2, … … and Pn, and the proportional throttle valves connected with the hydraulic pumps in parallel are respectively B1, B2, … … and Bn;

when the pressure required by an oil inlet of the hydraulic support is greater than 0 and less than P1, P1 represents the loading or unloading pressure of a hydraulic pump A1 in a preset first hydraulic pump group, the hydraulic pump A1 of the first hydraulic pump group is in a loading state, and the opening degree of a proportional throttle valve B1 of the first hydraulic pump group connected in parallel with the first hydraulic pump group is changed along with the pressure change required by the hydraulic support so as to control the flexible output and adjustment of flow; at the moment, the hydraulic pumps A2, … …, An are in An unloading state, and the proportional throttle valves B2, … …, Bn are in a full-open state;

when the pressure required by an oil inlet of the hydraulic support is greater than P1 and less than P2, P2 represents the loading or unloading pressure of a hydraulic pump A2 in a preset second hydraulic pump set, the hydraulic pump A2 of the second hydraulic pump set is in a loading state, and the opening degree of a proportional throttle valve B2 of the second hydraulic pump set connected in parallel with the second hydraulic pump set is changed along with the pressure change required by the hydraulic support so as to control the flexible output and adjustment of flow; at this time, the hydraulic pump a1 is still in the loaded state, the proportional throttle B1 is in the closed state, the hydraulic pumps A3, … …, An are in the unloaded state, and the proportional throttles B3, … …, Bn are in the fully opened state.

4. The flexible loading and unloading method of the high-flow pump station according to claim 1, characterized in that: the hydraulic support is a hydraulic actuator in a coal mining hydraulic system.

Technical Field

The invention relates to a method for controlling oil supply liquid, in particular to a flexible loading and unloading method for a high-flow pump station, which is particularly suitable for a multi-pump linkage hydraulic system used in coal mining.

Background

The pump station is a power source for supplying liquid to the hydraulic support of the fully mechanized mining face. The flow required by the hydraulic support of the fully mechanized mining face is large, so that the traditional hydraulic support pump station usually adopts multi-pump linkage control to supply liquid for the system. Each hydraulic pump is connected with an electromagnetic unloading valve in parallel, and the loading and unloading of the hydraulic pump are controlled by the electromagnetic unloading valve. According to the pressure of the system, the hydraulic pump is loaded or unloaded in sequence: when the pressure is lower than the required pressure, loading the next hydraulic pump and increasing the liquid supply flow; when the pressure is higher than the required pressure, an operating hydraulic pump is unloaded, and the supply flow is reduced. The hydraulic system of the method has large pressure impact, and the reliability and the service life of a pump station are influenced.

Disclosure of Invention

In order to solve the problems in the background technology, the invention provides a flexible loading and unloading method for a high-flow pump station, and solves the technical problems that the existing hydraulic system has large pressure impact and affects the reliability and the service life of the pump station.

The technical scheme adopted by the invention is as follows:

the invention comprises a hydraulic support and a pump station, wherein the inlet of the pump station is connected to an oil tank, and the outlet of the pump station is communicated with the oil inlet of the hydraulic support; the hydraulic pump sets are provided with motors, hydraulic pumps and filters; the output shaft of the motor is connected with the input shaft of the hydraulic pump, the oil inlet end of the hydraulic pump is communicated with the oil tank through the filter, and the output end of the hydraulic pump is output through the one-way valve; the hydraulic pump unit further comprises a proportional throttle valve, the output end of the hydraulic pump is communicated with the oil tank through the proportional throttle valve, and flexible loading and unloading of the hydraulic pump in the hydraulic pump unit are achieved by controlling the opening degree of the proportional throttle valve.

The hydraulic support is a hydraulic actuator.

The pump station is a hydraulic device or equipment for outputting a hydraulic power source.

The pump station comprises a plurality of hydraulic pump sets which are connected in parallel, and the plurality of hydraulic pump sets are sequentially loaded and unloaded.

The hydraulic pumps of each hydraulic pump group are sequentially loaded or unloaded, the pressure points of the loading or unloading of each hydraulic pump are sequentially P1, P2, … … and Pn, and the proportional throttle valves connected in parallel with the hydraulic pumps are respectively B1, B2, … … and Bn;

when the pressure required by an oil inlet of the hydraulic support is greater than 0 and less than P1, P1 represents the loading or unloading pressure of a hydraulic pump A1 in a preset first hydraulic pump group, the hydraulic pump A1 of the first hydraulic pump group is in a loading state, and the opening degree of a proportional throttle valve B1 of the first hydraulic pump group connected in parallel with the first hydraulic pump group is changed along with the pressure change required by the hydraulic support so as to control the flexible output and adjustment of flow; at the moment, the hydraulic pumps A2, … …, An are in An unloading state, and the proportional throttle valves B2, … …, Bn are in a full-open state;

when the pressure required by an oil inlet of the hydraulic support is greater than P1 and less than P2, P2 represents the loading or unloading pressure of a hydraulic pump A2 in a preset second hydraulic pump set, the hydraulic pump A2 of the second hydraulic pump set is in a loading state, and the opening degree of a proportional throttle valve B2 of the second hydraulic pump set connected in parallel with the second hydraulic pump set is changed along with the pressure change required by the hydraulic support so as to control the flexible output and adjustment of flow; at this time, the hydraulic pump a1 is still in the loaded state, the proportional throttle B1 is in the closed state, the hydraulic pumps A3, … …, An are in the unloaded state, and the proportional throttles B3, … …, Bn are in the fully opened state. The loading or unloading method of the hydraulic pump under other pressure states can be analogized.

The hydraulic support is a hydraulic actuator in a coal mining hydraulic system.

The invention has the beneficial effects that:

the method can effectively reduce the pressure impact of the hydraulic system, improve the reliability of the pump station and prolong the service life of the pump station.

Drawings

FIG. 1 is a schematic view of a mass flow pump station according to the present invention.

In the figure: 1-one-way valve, 2-motor, 3-hydraulic pump A1, 4-filter, 5-proportional throttle valve B1, 6-hydraulic pump A2, 7-proportional throttle valve B2, 8-hydraulic pump An, 9-proportional throttle valve Bn, 10-oil tank, 11-output pipeline.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

As shown in FIG. 1, the device comprises a hydraulic support and a pump station, wherein the inlet of the pump station is connected to an oil tank 10, the outlet of the pump station is communicated with the oil inlet of the hydraulic support, and the oil discharge end of the hydraulic support is communicated with the oil tank; each hydraulic pump set is provided with a motor 2, a hydraulic pump and a filter 4; the output shaft of the motor 2 is connected with the input shaft of the hydraulic pump 3, the oil inlet end of the hydraulic pump 3 is communicated with the oil tank 10 through the filter 4, the output end of the hydraulic pump 3 is output through the one-way valve 1 and can be connected to the hydraulic support through structures such as energy storage and the like; the hydraulic pump unit further comprises a proportional throttle valve 5, the output end of the hydraulic pump 3 is communicated with an oil tank 10 through the proportional throttle valve 5, and flexible loading and unloading of the hydraulic pump 3 in the hydraulic pump unit are achieved by controlling the opening degree of the proportional throttle valve 5.

The pump station comprises a valve control liquid supply system, the pump station comprises a plurality of hydraulic pump sets which are connected in parallel, the input ends of the hydraulic pump sets are connected to an oil tank, the output ends of the hydraulic pump sets are connected together, the hydraulic pump sets are sequentially loaded and unloaded, and one hydraulic pump set is used for loading and unloading each time.

The flexible loading and unloading control method and the principle process thereof are as follows:

to achieve the required pressure of the system, the hydraulic pumps a1, a2, … …, An of each hydraulic pump group are loaded or unloaded in turn, n represents the total number of hydraulic pump groups; the pressure points of the hydraulic pumps 1, 2, … … and N for loading or unloading are P1, P2, … … and Pn in sequence, and the proportional throttle valves connected with the hydraulic pumps in parallel are B1, B2, … … and Bn respectively;

when the pressure required by the oil inlet of the hydraulic support is greater than 0 and less than P1, P1 represents the loading or unloading pressure of a hydraulic pump A1 in a preset first hydraulic pump group, the hydraulic pump A1 of the first hydraulic pump group is in a loading state, and the opening degree of a proportional throttle valve B1 of the first hydraulic pump group connected in parallel with the hydraulic pump group is changed along with the pressure change required by the oil inlet of the hydraulic support so as to control the flexible output and adjustment of flow; when the pressure required by the oil inlet of the hydraulic support is larger than the output pressure of the pump station, the opening of the proportional throttle valve B1 is reduced to increase the output flow of the pump station, so that the output pressure of the pump station is increased until the pressure required by the oil inlet of the hydraulic support can be met. When the pressure required by the oil inlet of the hydraulic support is smaller than the output pressure of the pump station, the opening of the proportional throttle valve B1 is increased to reduce the output flow of the pump station, so that the output pressure of the pump station is reduced until the pressure required by the oil inlet of the hydraulic support can be met. At the moment, the hydraulic pumps A2, … …, An are in An unloading state, and the proportional throttle valves B2, … …, Bn are in a full-open state;

when the pressure required by the oil inlet of the hydraulic bracket is greater than P1 and less than P2, P2 represents the loading or unloading pressure of a hydraulic pump A2 in a preset second hydraulic pump group, the hydraulic pump A2 of the second hydraulic pump group is in a loading state, and the opening degree of a proportional throttle valve B2 of the second hydraulic pump group connected in parallel with the second hydraulic pump group is changed along with the pressure change required by the oil inlet of the hydraulic bracket so as to control the flexible output and adjustment of flow; when the pressure required by the oil inlet of the hydraulic support is larger than the output pressure of the pump station, the opening of the proportional throttle valve B2 is reduced to increase the output flow of the pump station, so that the output pressure of the pump station is increased until the pressure required by the oil inlet of the hydraulic support can be met. When the pressure required by the oil inlet of the hydraulic support is smaller than the output pressure of the pump station, the opening of the proportional throttle valve B2 is increased to reduce the output flow of the pump station, so that the output pressure of the pump station is reduced until the pressure required by the oil inlet of the hydraulic support can be met. At this time, the hydraulic pump a1 is still in the loaded state, the proportional throttle B1 is in the closed state, the hydraulic pumps A3, … …, An are in the unloaded state, and the proportional throttles B3, … …, Bn are in the fully opened state. The loading or unloading method of the hydraulic pump under other pressure states can be analogized.

The hydraulic support is a hydraulic actuator in a coal mining hydraulic system.

The flexible loading and unloading control method disclosed by the invention has the following principle:

when the hydraulic support works, the valve-controlled liquid supply system 1#, 2#, … … and N # supply liquid for the hydraulic support through the output pipeline 11. The hydraulic pumps 3, 6, 8 will in turn be loaded or unloaded based on the required output line 11 pressure. The pressure points of the hydraulic pumps 3, 6 and 8 for loading or unloading are P1, P2 and Pn in sequence. The loading or unloading of the hydraulic pumps 3, 6, 8 is controlled by means of proportional throttles 5, 7, 9. By adjusting the opening of the proportional throttle valves 5, 7,9, the desired output line 11 pressure is obtained.

When the pressure required by the system is more than 0 and less than P1, the hydraulic pump 3 is in a loading state, and the opening degree of the proportional throttle valve 5 connected in parallel with the loading state is changed along with the pressure required by the system so as to control the flow output. One part of oil pumped by the hydraulic pump 3 flows to an output pipeline 11 through the check valve 1, and the other part of oil flows back to an oil tank through the proportional throttle valve 5. At this time, the hydraulic pumps 6, 8 are in the unloading state, and the proportional throttle valves 7,9 are in the full opening state. The oil pumped by the hydraulic pumps 6, 8 flows back to the oil tank through the throttle valves 7, 9.

When the pressure required by the system is more than P1 and less than P2, the hydraulic pump 6 is in a loading state, and the opening degree of the proportional throttle valve 7 connected with the hydraulic pump is used for regulating the control flow output according to the system pressure. One part of the oil pumped by the hydraulic pump 6 flows to an output pipeline 11 through a one-way valve, and the other part of the oil flows back to the oil tank through a proportional throttle valve 7. At the moment, the hydraulic pump 3 still keeps a loading state, the proportional throttle valve 5 is in a closing state, and oil pumped by the hydraulic pump 3 flows to the output pipeline 11 through the check valve 1. The hydraulic pump 8 is in an unloading state, the proportional throttle valve 9 is in a full-open state, and oil pumped out by the hydraulic pump 8 flows back to the oil tank through the throttle valve 9.

The foregoing detailed description is intended to be illustrative of the invention, which is only one, but not all embodiments of the invention. Any modification and variation made within the spirit of the present invention and the scope of the claims are within the scope of the present invention.