Mining cutting equipment and pump-controlled motor control system thereof

Abstract

The utility model discloses a kind of mining cutting equipment and pump control motor control system thereof, pump control motor control system includes: with the motor and the motor of mining cutting equipment respectively connected main plunger pump;With the series connection of auxiliary plunger pump of main plunger pump;With the displacement control piston of main plunger pump connection pump control valve core;Proportional electromagnet for adjusting pump control valve core position is installed on main plunger pump;Main safety valve and two-way plug-in reversing valve are installed between the oil circuit of main plunger pump outlet and motor.The utility model of mining cutting equipment and pump control motor control system thereof, the motor speed of mining cutting equipment can be accurately controlled, cutting speed is slow when entering tool, tooth striking, chain jumping, cutting skew problem does not appear when entering tool, improve cutting efficiency, effectively unload mine pressure.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary mechanical equipment for coal mine roadway repair and roadway depressurization, and in particular to a mining cutting equipment such as a chainsaw trencher and chainsaw top cutter that can accurately control the cutting speed of the chainsaw during chainsaw cutting and can adaptively adjust speed and pressure, as well as its pump control motor control system. Background Technology

[0002] With the continuous mechanization of the coal industry, auxiliary machinery for roadway repair is widely used in coal mine production. Among them, chainsaw trenchers and chainsaw roof cutters are important development directions for roadway repair machinery. They are mainly used to solve problems such as deformation and damage to the floor or roof of coal mine roadways due to high mine pressure. Therefore, chainsaws are often used to cut a gap in the floor or roof of the roadway to break the integrity of the floor or roof, thereby relieving the mine pressure.

[0003] When chainsaw trenchers and chainsaw top cutters begin cutting, high speeds can cause problems such as tooth breakage, chain skipping, and misaligned cuts. Therefore, the chainsaw needs to enter the cutting area at an extremely slow speed, gradually increasing the speed. However, most existing chainsaw motor control systems use proportional directional valves to control the motor's speed. Due to limitations in the performance of these valves, there is an opening dead zone, resulting in existing chainsaw motors operating too fast at low speeds, failing to meet the required cutting speed for the chainsaw entry point. Summary of the Invention

[0004] The purpose of this invention is to solve the above problems by providing a mining cutting equipment and its pump-controlled motor control system, which can precisely control the motor speed of the mining cutting equipment, so that the cutting speed is slow and there are no problems such as tooth breakage, chain skipping, or crooked cutting during the cutting process, thereby improving cutting efficiency and effectively unloading the mining pressure.

[0005] To achieve the above-mentioned objectives of this utility model, one aspect of this utility model is to provide a pump-controlled motor control system for a mining cutting equipment, comprising: a main plunger pump connected to a motor and a motor of the mining cutting equipment respectively; a secondary plunger pump connected in series with the main plunger pump; a pump control valve core connected to the displacement control piston of the main plunger pump; a proportional electromagnet installed on the main plunger pump for adjusting the position of the pump control valve core; a main safety valve and a two-way cartridge directional valve installed on the oil line between the outlet of the main plunger pump and the motor.

[0006] Preferably, the main safety valve and the two-way cartridge directional valve are connected in parallel.

[0007] Preferably, the main plunger pump is an open main plunger pump.

[0008] Preferably, the auxiliary plunger pump provides a pressure greater than 30 bar to the main plunger pump.

[0009] Preferably, the mining cutting equipment is a mining chainsaw trencher or a mining chainsaw top cutter.

[0010] On the other hand, this utility model also provides a mining cutting device, which includes the pump-controlled motor control system described above.

[0011] Compared with the prior art, the mining cutting equipment and its pump-controlled motor control system of this utility model have the following advantages:

[0012] 1. The mining cutting equipment and its pump-controlled motor control system of this utility model can precisely control the motor speed of the mining cutting equipment, so that the cutting speed is slow and there will be no problems such as tooth breakage, chain skipping, or crooked cutting during cutting, thereby improving cutting efficiency and effectively unloading the mining pressure.

[0013] 2. The mining cutting equipment and its pump control motor control system of this utility model include a secondary plunger pump and a main plunger pump connected in series and driven by a motor. The pump control valve core is connected to the displacement control piston of the main plunger pump. A proportional electromagnet adjusts the position of the pump control valve core. A main safety valve and a two-way cartridge reversing valve are installed between the outlet of the main plunger pump and the motor. In practical applications, the secondary plunger pump can provide a certain pressure to the main plunger pump. By controlling the magnitude of the current of the proportional electromagnet, the displacement of the main plunger pump is controlled, thereby enabling precise control of the motor speed of the mining cutting equipment. This avoids the cutting speed of the mining cutting equipment being too fast and also prevents motor malfunction.

[0014] The present invention will now be described in detail with reference to the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the working principle of the pump-controlled motor control system of the mining cutting equipment of this utility model.

[0016] Figure 2 This is a schematic diagram of the pump-controlled motor control system of this utility model when the proportional electromagnet has no control signal and the motor is stationary.

[0017] Figure 3 This is a schematic diagram illustrating the principle of the pump-controlled motor control system of this utility model, where a proportional electromagnet has a control current and the motor is in a rotating working state.

[0018] Figure 4 This is a schematic diagram of the pump-controlled motor control system of this utility model when the motor is in an overload state. Detailed Implementation

[0019] like Figure 1The diagram shows the working principle of the pump-controlled motor control system of the mining cutting equipment of this utility model. As can be seen from the diagram, the pump-controlled motor control system of the mining cutting equipment of this utility model includes: a main plunger pump 2 connected to the motor 8 and the chainsaw motor 7 of the mining cutting equipment respectively; a secondary plunger pump 1 connected in series with the main plunger pump; a pump control valve core 4 connected to the displacement control piston of the main plunger pump; a proportional electromagnet 3 installed on the main plunger pump for adjusting the position of the pump control valve core; a main safety valve 5 and a two-way cartridge reversing valve 6 installed on the oil line between the outlet of the main plunger pump and the chainsaw motor. The main plunger pump is an open-type main plunger pump.

[0020] Specifically, the pump control motor control system of the mining cutting equipment of this utility model includes a secondary plunger pump 1, an open main plunger pump 2, a proportional electromagnet 3, a pump control valve core 4, a main safety valve 5, a two-way cartridge reversing valve 6, and a chainsaw motor 7.

[0021] The auxiliary plunger pump 1 and the open main plunger pump 2 are connected in series and driven by a motor. The auxiliary plunger pump 1 supplies control oil greater than 30 bar to the open main plunger pump 2 through port M. The pump control valve spool 4 is connected to the displacement control piston of the open main plunger pump 2. The position of the pump control valve spool 4 is controlled by controlling the current of the proportional electromagnet 3. The position of the pump control valve spool determines the output displacement of the open main plunger pump 2, and the output displacement determines the speed of the chainsaw motor. The main safety valve 5 and the two-way cartridge directional valve 6 are connected in parallel in the main oil circuit between the outlet of the main plunger pump and the chainsaw motor. The two-way cartridge directional valve 6 controls the opening and closing of the main oil circuit. By controlling the two-way cartridge directional valve 6, the rotation and stop of the chainsaw motor are controlled to prevent malfunction of the chainsaw motor. The main safety valve 5 provides system protection. In this invention, the proportional electromagnet 3 and the two-way cartridge directional valve 6 are simultaneously energized and de-energized.

[0022] Below, in conjunction with Figures 2-4 The working process of the pump-controlled motor control system of the mining cutting equipment of this utility model is described.

[0023] like Figure 2 As shown, the chainsaw motor is in a stopped state: the proportional solenoid 3 and the two-way cartridge directional valve 6 are simultaneously de-energized, and the two-way cartridge directional valve 6 remains closed; the pump control valve spool 4 has no displacement. At this time, the pressure oil (greater than 30 bar) supplied by the auxiliary plunger pump 1 enters the open main plunger pump 2. When there is no control signal from the proportional solenoid 3, the open main plunger pump 2 is in its minimum displacement state. At this time, no pressure oil enters the chainsaw motor 7, and it is in a stopped state.

[0024] like Figure 3As shown, the chainsaw motor is in a rotating operating state: the proportional electromagnet 3 and the two-way cartridge directional valve 6 are simultaneously energized, and the two-way cartridge directional valve 6 becomes open. By controlling the magnitude of the current to the proportional electromagnet 3, the position of the pump control valve core 3 is controlled. As the current to the proportional electromagnet 3 increases, the open main plunger pump 2 swings to a larger displacement. At this time, pressurized oil enters the chainsaw motor 7, and as the displacement of the open main plunger pump 2 increases, the speed of the chainsaw motor 7 increases.

[0025] like Figure 4 As shown, as the load increases, the input pressure of the chainsaw motor 7 increases. When the pressure value exceeds the set value of the main safety valve 5, the high-pressure oil will flow into the oil tank through the main safety valve 5, thereby playing the role of overload protection through the main safety valve.

[0026] In addition to providing the above-mentioned pump-controlled motor control system, this utility model also provides a mining cutting device including the above-mentioned pump-controlled motor control system, which is a mining chainsaw trencher or a mining chainsaw top cutter.

[0027] The mining cutting equipment and its pump-controlled motor control system of this utility model can accurately control the speed of the chainsaw motor when the chainsaw is cutting in the chainsaw trenching machine or chainsaw top cutting machine, which has obvious practical effect.

[0028] Although the present invention has been described in detail above, it is not limited thereto. Those skilled in the art can make modifications based on the principles of the present invention. Therefore, all modifications made in accordance with the principles of the present invention should be understood as falling within the protection scope of the present invention.

Claims

1. A pump-controlled motor control system for mining cutting equipment, characterized in that, include: A main plunger pump that is connected to both the electric motor and the motor of the mining cutting equipment; A secondary plunger pump connected in series with the main plunger pump; Pump control valve core connected to the displacement control piston of the main plunger pump; A proportional electromagnet installed on the main plunger pump for adjusting the position of the pump control valve core; The main safety valve and the two-way cartridge directional valve are installed on the oil line between the main plunger pump outlet and the motor.

2. The pump-controlled motor control system according to claim 1, characterized in that, The main safety valve and the two-way cartridge directional valve are connected in parallel.

3. The pump-controlled motor control system according to claim 1 or 2, characterized in that, The main plunger pump is an open-type main plunger pump.

4. The pump-controlled motor control system according to any one of claims 1-3, characterized in that, The auxiliary plunger pump provides the main plunger pump with a pressure greater than 30 bar.

5. The pump-controlled motor control system according to any one of claims 1-4, characterized in that, The mining cutting equipment is a mining chainsaw trencher or a mining chainsaw top cutter.

6. A mining cutting device, characterized in that, Including the pump-controlled motor control system as described in any one of claims 1-5.

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