WO2021004397A1

WO2021004397A1 - Large flow valve-pump joint control emulsion pump station and control method therefor

Info

Publication number: WO2021004397A1
Application number: PCT/CN2020/100215
Authority: WO
Inventors: 赵继云; 曹超; 王云飞; 满家祥; 张鹤
Original assignee: 中国矿业大学
Priority date: 2019-07-09
Filing date: 2020-07-03
Publication date: 2021-01-14
Also published as: CN110307193B; CN110307193A

Abstract

A large flow valve-pump joint control emulsion pump station and a control method therefor, particularly suitable for use in the field of coal electromechanical equipment hydraulic systems. A valve-controlled liquid supply system is added to an existing pump-controlled emulsion pump station system controlled by an inverter, a filter being connected to a small metering pump (2), the small metering pump (2) being driven by a motor (3), there being three bypasses at the outlet of the small metering pump (2), one entering a hydraulic support system, another being connected to a proportional throttle valve (6) to flow back to an oil tank (9), and another being connected to a relief valve (4) to flow back to the oil tank (9). The pumped flow flows into the hydraulic support system in a timely manner, the flow being small and stable, increasing the response speed of the entire system. When the pump control system is started, as the hydraulic support system already has a flow entering, flow fluctuations and shocks are greatly reduced; the structure is simple and maintenance is convenient.

Description

Large flow valve-pump combined control emulsion pump station and control method thereof

Technical field

The invention relates to a large-flow valve-pump combined control emulsion pump station and a control method thereof, and is particularly suitable for a new type of emulsion combined with a valve-controlled liquid supply system and a pump-controlled liquid supply system used in the field of coal electromechanical equipment hydraulic systems Pump station and control method.

Background technique

Emulsion pumping station is a power equipment used to deliver high-pressure emulsion to the hydraulic support of a fully mechanized mining face or a single hydraulic prop of a general mining face. The traditional emulsion pumping system of a fully mechanized face is mainly controlled by variable frequency and constant pressure. Mainly, the basic principle is that the pressure signal of the hydraulic system of the hydraulic support is fed back to the controller, and the controller controls the frequency converter to drive the operation of the quantitative pump to provide pressure and flow for the hydraulic support system. However, when the frequency converter drives the fixed pump to supply liquid to the system, how long is the acceleration and deceleration time of the frequency conversion motor, and the liquid supply speed of the system is slow, and its liquid supply delay has a serious impact

The movement speed of the hydraulic support. In addition, when the shearer speed is fast, multiple hydraulic supports will act at the same time. At this time, a quantitative pump is required to supply a large amount of flow. The pumping station will supply liquid with multiple pumps. The start of multiple pumps will cause flow fluctuations in the pipeline. , Causing impact damage to the hydraulic support system.

In this regard, this patent designs the addition of a small quantitative pump controlled by a motor to supply liquid at the same time on the basis of the existing frequency converter controlled quantitative pump liquid supply pump station. The bypass of this liquid supply system is connected in parallel with a proportional throttle The valve, by adjusting the opening size of the proportional throttle valve, controls the flow rate supplied by the quantitative pump to the hydraulic support system. This is a valve-controlled liquid supply system. The original frequency converter controlled quantitative pump liquid supply system is a pump controlled liquid supply system. The two combine to supply liquid for the hydraulic support system, which can not only increase the liquid supply speed of the system, but also reduce the flow impact generated during the liquid supply process. Summary of the invention

Aiming at the above technical problems, an emulsion pumping station is provided with a fast response speed, fast liquid supply, and a small and stable flow impact during the opening and closing of multiple pumps. A large flow valve-pump combined control emulsion pumping station and a control method thereof are provided.

In order to achieve the above technical objectives, the large flow valve-pump combined control emulsion pump station of the present invention includes a pump-controlled liquid supply system, which is characterized in that: in the existing frequency converter controlled pump-controlled emulsion pump station system, Another valve-controlled liquid supply system, the filter is connected to a small quantitative pump, which is driven by a motor. There are three bypasses at the outlet of the small quantitative pump, one enters the hydraulic support system, and the other is connected to a proportional throttle valve to flow back Fuel tank, the last one is connected to the overflow valve to flow back to the fuel tank.

Specifically, it includes a pump-controlled liquid supply system, and a valve-controlled liquid supply system is arranged in parallel with the pump-controlled liquid supply system; the valve-controlled liquid supply system includes a filter, a small quantitative pump, a motor, an overflow valve, a one-way valve, and a proportional Throttle valve, accumulator, flow meter and fuel tank; the small quantitative pump is equipped with a motor; there is a pipeline that directly returns to the fuel tank in the fuel tank, and the pipeline is equipped with a proportional throttle and overflow valve. Equipped with a motor, the inlet of the small quantitative pump is connected to the tank pipeline through a filter, the outlet of the small quantitative pump is equipped with an overflow valve to protect the entire hydraulic system, and the output port of the small quantitative pump is connected with the overflow valve and one-way The inlet of the valve is connected with the proportional throttle valve, the output port of the one-way valve is connected with the liquid supply system of the hydraulic support through a pipeline, and the pipeline between the output port of the one-way valve and the liquid supply system of the hydraulic support is respectively It is equipped with an accumulator and a flow meter to adjust the overflow pressure of the overflow valve to directly flow back to the oil tank, and then control the flow from the small quantitative pump into the hydraulic system.

A control method for large flow valve-pump combined control of emulsion pumping station, which works in coordination with the existing emulsion pumping station system. The steps are as follows:

When the hydraulic support is in the supporting state, the hydraulic support electro-hydraulic valve group matched with the hydraulic support is in the closed state, and the motor controlled by the inverter in the pump-controlled liquid supply system is in the power frequency working state, that is, the large variable pump is driven at the lowest speed. At this time, start the valve-controlled liquid supply system and connect it to the existing emulsion pump station system to work:

The motor drives the small quantitative pump to pump out the emulsion. At this time, the emulsion flows back to the tank through the proportional throttle valve. When the hydraulic support moves, first open the hydraulic support electro-hydraulic valve group, and the valve-controlled liquid supply system provides the flow rate The hydraulic support needs to be operated. By adjusting the input current of the proportional throttle valve, the opening of the proportional throttle valve is reduced. The emulsion pumped by the small quantitative pump driven by the motor quickly enters the hydraulic support to supplement its pressure and flow. The whole process The pump-controlled liquid supply system and the valve-controlled liquid supply system work at the same time, while the valve-controlled liquid supply system has a faster response. The motor controlled by the frequency converter enters the frequency conversion working state from the power frequency working state, and the frequency converter controlled motor speeds up to improve The flow and pressure of the emulsion pump of the large variable pump supplement the pressure lost and the required flow during the action of the hydraulic support (13). The pumped flow and pressure vary according to the movement range of the hydraulic support, supporting the hydraulic support (13) Carrying out actions for lowering, moving, lifting and pushing and slipping can slow down the flow fluctuation and impact phenomenon of the existing pumping station liquid supply system, and greatly improve the response speed of the entire system.

Beneficial effects: The present invention adds a valve-controlled liquid supply system to the existing emulsion pump station. The valve-controlled liquid supply system is mainly composed of a filter, a small quantitative pump, a motor, an overflow valve, a one-way valve, and a proportional valve. It consists of flow valve, accumulator and flow meter. The control core of the valve-controlled liquid supply system is the proportional throttle valve. Because of its fast response speed, when the hydraulic support moves, the valve-controlled liquid supply system responds immediately, and the flow from the small quantitative pump flows into the hydraulic support system in time. Small and stable, improving the response speed of the entire system. When the pump-controlled liquid supply system is started, since the hydraulic support system has flow entered, its flow fluctuation and impact will be greatly reduced, and its structure is simple and easy to maintain.

Description of the drawings

Fig. 1 is a schematic diagram of the mechanism of the present invention with a large flow valve-pump combined control emulsion pump station.

Description of the drawings: 1-filter 2-small quantitative pump 3-motor 4-overflow valve 5-check valve 6-proportional throttle valve 7-accumulator 8-flow meter 9-fuel tank 10-large variable pump 11 -Motor controlled by frequency converter 12-Hydraulic support electro-hydraulic valve group 13-Hydraulic support.

Detailed ways

The embodiments of the present invention will be further described below in conjunction with the drawings:

As shown in Figure 1, the large-flow valve-pump combined control emulsion pump station of the present invention includes a pump-controlled liquid supply system, which is characterized in that: in the existing inverter-controlled pump-controlled emulsion pump station system, The other valve control liquid supply system, the filter is connected to the small quantitative pump 2, which is driven by the motor 2. There are three bypasses at the outlet of the small quantitative pump 2, one enters the hydraulic support system, and the other is connected to the proportional throttle The valve 6 flows back to the fuel tank 9 and the last one is connected to the overflow valve 4 to flow back to the fuel tank 9.

A valve-controlled liquid supply system is provided in parallel with the pump-controlled liquid supply system; the valve-controlled liquid supply system includes filter 1, small quantitative pump 2, motor 3, overflow valve 4, check valve 5, proportional throttle valve 6, and accumulator The energy device 7, the flow meter 8 and the oil tank 9; the small quantitative pump 2 is equipped with a motor 3; the oil tank 9 is equipped with a pipeline that directly returns to the oil tank 9, and the pipeline is equipped with a proportional throttle valve 6 and an overflow valve 4. The small quantitative pump 2 is equipped with a motor 3, the inlet of the small quantitative pump 2 is connected to the tank 9 through the filter 1 and the outlet of the small quantitative pump 2 is provided with an overflow valve 4 for protecting the entire hydraulic system. The output ports of 2 are respectively connected to the inlet of the overflow valve 4, the check valve 5 and the proportional throttle valve 6. The output port of the check valve 5 is connected to the hydraulic support liquid supply system through the pipeline, the check valve 5 An accumulator 7 and a flow meter 8 are respectively provided on the pipeline between the output port of the hydraulic support and the liquid supply system phase of the hydraulic support. The overflow pressure of the overflow valve 4 is adjusted to directly flow back to the oil tank 9 to control the small quantitative pump 2 Pump out the flow into the hydraulic system of the liquid supply.

When the hydraulic support 13 is in the supporting state, the motor 11 controlled by the inverter in the pump-controlled liquid supply system is in the power frequency working state, that is, the large variable pump 10 is driven at the lowest speed to start working. At this time, the valve-controlled liquid supply system is started in parallel The existing emulsion pumping station system works: the motor 3 drives the small quantitative pump 2 to work and pumps out the emulsion. At this time, the emulsion flows back to the oil tank through the proportional throttle valve 6. When the hydraulic support 13 operates, a liquid supply system is required Provide flow to meet its action needs. By adjusting the input current of the proportional throttle valve 6, the opening of the proportional throttle valve 6 becomes smaller, and the emulsion pumped by the small quantitative pump 2 driven by the motor 3 quickly enters the hydraulic support 13, supplementing The pressure and flow rate, the pump-controlled liquid supply system and the valve-controlled liquid supply system work at the same time in the whole process, and the valve-controlled liquid supply system has a faster response. The motor 11 controlled by the frequency converter enters the frequency conversion working state from the power frequency working state. The motor 11 controlled by the controller accelerates the operation, increases the emulsion pump flow and pressure of the large variable pump 10, and supplements the pressure lost and the required flow of the hydraulic support 13 when the hydraulic support 13 moves. The pumped flow and pressure are based on the amplitude of the hydraulic support movement. However, it supports the hydraulic support 13 to perform actions to lower, move, raise and push and slide, so that the flow fluctuation and impact phenomenon of the existing pump station liquid supply system can be slowed down, and the response speed of the entire system is greatly improved.

The small quantitative pump 2 is connected to the oil tank 9 through the filter 1, and the motor 3 drives the small quantitative pump 2 to rotate through rotation, and the emulsion is pumped out from the oil tank 9 to supply liquid to the hydraulic support system. An overflow valve 4 is installed at the outlet of the small quantitative pump 2 to protect this circuit. The main liquid supply pipeline is connected to the liquid supply system of the hydraulic support through the one-way valve 5. The accumulator 7 and the flow meter 8 are installed in this pipeline, and they are used to measure the energy and model flow respectively. A pipeline that directly returns to the tank 9 is connected in parallel next to the liquid supply pipeline. A proportional throttle valve 6 is installed on this pipeline. By adjusting the opening size of the proportional throttle valve 6, the pipeline can directly flow back to the tank 9 The flow rate in turn affects the flow rate from the small quantitative pump 2 into the hydraulic system.

The original emulsion pump station is a pump-controlled liquid supply system, and the structure is a multi-pump combined liquid supply structure. According to the number of units, we can divide it into No. 1 to No. N. Among them, the emulsion pump station is equipped with a large variable pump 10, large The variable pump 10 is provided with a motor 11 controlled by a frequency converter. When the hydraulic support system is in a supporting state, only one large variable pump 10 works in the pump-controlled liquid supply system, and the motor 11 controlled by the frequency converter is in a frequency conversion state. The valve-controlled liquid supply system of the new parallel inlet system is also in a normally open working state, and the small quantitative pump 2 driven by the motor 3 is always in working state. By adjusting the opening size of the proportional throttle valve 6, the flow of the valve-controlled liquid supply system into the hydraulic support system is controlled. When the hydraulic support 13 needs to move, the pressure at the outlet of the liquid supply system will change, and the controller will recognize the pressure signal and issue a control command to the motor 11 controlled by the inverter. The motor 11 controlled by the frequency converter accelerates to increase the outlet pressure and flow of the large variable pump 10, but the motor 11 controlled by the frequency converter has a longer acceleration time, and the output flow of the large variable pump 10 cannot meet the requirements of the hydraulic support 13. At this time, the valve-controlled liquid supply system shows its control advantages due to its faster response speed. By reducing the opening of the proportional throttle valve 6, the flow pumped by the small quantitative pump 2 flows into the system of the hydraulic support 13 more, and the rapid action of the hydraulic support 13 is realized. When multiple hydraulic supports need to act at the same time, the pressure and flow output of the large variable pump controlled by only one inverter may not meet the system requirements. At this time, the large variable pump controlled by the second inverter needs to be started. There are large flow fluctuations and flow shocks during the startup process. By reducing the opening of the proportional throttle valve 6, the flow provided by the valve-controlled liquid supply system is appropriately increased, which can reduce the flow fluctuations and shocks of the support hydraulic system. When the hydraulic support 13 is finished, it is in the supporting state again. At this time, multiple large variable pumps in the pump-controlled liquid supply system are closed one by one. Flow fluctuations and flow shocks will also occur during the closing process. Adjust the valve-controlled liquid supply appropriately The opening of the proportional throttle valve 6 in the system can reduce the influence of this phenomenon. When the excess large variable pump stops running, the pump-controlled liquid supply system will only have one large variable pump 10 controlled by the frequency converter in the frequency conversion working state. At this time, appropriately increase the proportional throttle valve 6 in the valve-controlled liquid supply system. The opening reduces the flow into the hydraulic system of the support.

Claims

A large-flow valve-pump combined control emulsion pump station, including a pump-controlled liquid supply system, is characterized in that: another valve-controlled liquid supply system is added: a filter is connected to a small quantitative pump (2), a small quantitative pump ( 2) Driven by the motor, there are three bypasses at the outlet of the small quantitative pump (2), one enters the hydraulic support system, the other is connected to the proportional throttle valve (6) and flows back to the tank (9), and the last is connected to the overflow valve (4) Flow back to the fuel tank (9).
The high-flow valve-pump combined control emulsion pumping station according to claim 1, wherein the pump-controlled liquid supply system is a multi-pump combined liquid supply structure, including multiple emulsion pump stations, emulsion pump stations A large variable pump (10) is provided in the middle, and a motor (11) controlled by a frequency converter is provided on the large variable pump (10).
The high-flow valve-pump combined control emulsion pump station according to claim 1, wherein a valve-controlled liquid supply system is provided in parallel with the pump-controlled liquid supply system;

The valve-controlled liquid supply system includes a filter (1), a small quantitative pump (2), a motor (3), an overflow valve (4), a one-way valve (5), a proportional throttle valve (6), and an accumulator ( 7), flow meter (8) and fuel tank (9); the small quantitative pump (2) is equipped with a motor (3); the fuel tank (9) is equipped with a pipeline that directly returns to the fuel tank (9), and the pipeline is equipped Proportional throttle valve (6) and overflow valve (4), the small quantitative pump (2) is equipped with a motor (3), the inlet of the small quantitative pump (2) passes through the filter (1) and the tank (9) pipeline Connected, the outlet of the small quantitative pump (2) is provided with an overflow valve (4) for protecting the entire hydraulic system, and the output port of the small quantitative pump (2) is connected with the overflow valve (4) and the one-way valve (5) respectively The inlet of the one-way valve (6) is connected with the proportional throttle valve (6), the output port of the one-way valve (5) is connected to the liquid supply system of the hydraulic support through a pipeline, and the output port of the one-way valve (5) is between the hydraulic support An accumulator (7) and a flow meter (8) are respectively arranged on the pipeline of the, adjust the overflow pressure of the overflow valve (4) to directly flow back to the flow rate of the tank (9), and then control the pumping from the small quantitative pump (2) The flow into the hydraulic system of the fluid supply.
A control method for using the large flow valve-pump combined control of the emulsion pump station described in the above claims to work in coordination with the emulsion pump station system, characterized in that the steps are as follows:

When the hydraulic support (13) is in the supporting state, the hydraulic support electro-hydraulic valve group (12) matched with the hydraulic support (13) is in the closed state, and the motor (11) controlled by the frequency converter in the pump-controlled liquid supply system is in the power frequency Working state, that is, the large variable pump (10) is driven to work at the lowest speed. At this time, the valve-controlled liquid supply system is started in parallel to the emulsion pump station system to work: the motor (3) drives the small quantitative pump (2) to work and pump out Emulsion. At this time, the emulsion flows back to the tank through the proportional throttle valve (6). When the hydraulic support (13) needs to be moved, first open the hydraulic support electro-hydraulic valve group (12), and the valve-controlled liquid supply system provides flow To meet the action needs of the hydraulic support (13), by adjusting the input current of the proportional throttle valve (6), the opening of the proportional throttle valve (6) becomes smaller, and the small quantitative pump (2) driven by the motor (3) pumps out The emulsion quickly enters the hydraulic support (13) to replenish its pressure and flow. The pump-controlled liquid supply system and the valve-controlled liquid supply system work at the same time during the entire process, and the valve-controlled liquid supply system has a faster response and is controlled by the frequency converter. The motor (11) enters the variable frequency operating state from the power frequency working state, and the motor (11) controlled by the frequency converter accelerates to increase the flow and pressure of the emulsion pump of the large variable pump (10), which will cause losses when the hydraulic support (13) operates The pumped flow and pressure vary according to the amplitude of the hydraulic support. The hydraulic support (13) is supported to perform actions such as lowering, moving, lifting and pushing, so that the pumping station’s liquid supply system Flow fluctuations and shock phenomena can be slowed down, while greatly improving the response speed of the entire system.
The control method according to claim 4, characterized in that: the small quantitative pump (2) is connected to the oil tank (9) through a filter (1), and the motor (3) drives the small quantitative pump (2) to rotate through rotation, from The emulsion is pumped from the oil tank (9) to supply the hydraulic support system.
The control method according to claim 4, characterized in that: an overflow valve (4) is installed at the outlet of the small quantitative pump (2) to protect the circuit.
The control method according to claim 4, characterized in that: the main liquid supply pipeline is connected to the liquid supply system of the hydraulic support through a one-way valve (5), an accumulator (7) and a flow meter (8) Installed in this pipeline, it is used for the measurement of retractable energy and model flow.
The control method according to claim 7, characterized in that: a pipeline directly returning to the oil tank (9) is connected in parallel beside the liquid supply pipeline where the accumulator (7) and the flow meter (8) are installed. The pipeline of (9) is equipped with a proportional throttle valve (6). By adjusting the opening size of the proportional throttle valve (6), the flow rate of this pipeline directly flowing back to the tank (9) can be adjusted, thereby affecting the constant pump ( 2) The flow of pumping and flowing into the hydraulic system of the liquid supply.