CN204406126U - Safety operation monitoring device for coal mine machine digging face ventilation dust-removing system - Google Patents

Abstract

The utility model relates to the field of coal mines, in particular to a monitoring device for safe operation of a ventilation and dust removal system for excavating faces of coal mining machines. The monitoring device for the safe operation of the ventilation and dust removal system of coal mining machine excavation includes a control box, an air volume measuring device for measuring the compressed air volume of the ventilation and dust removal system, a first methane concentration sensor arranged in the overlapping section of the air cylinder, and a first methane concentration sensor arranged in the ventilation and dust removal system. The second methane concentration sensor, the dust concentration sensor at the air inlet, and the dust concentration sensor at the air outlet; the pressure air volume measuring device, the first methane concentration sensor, the second methane concentration sensor, the dust concentration sensor at the air inlet The sensor and the dust concentration sensor at the air outlet are electrically connected to the control box.

Description

Monitoring device for safe operation of ventilation and dust removal system of mining machine excavation face

technical field

The utility model relates to the field of coal mines, in particular to a monitoring device for safe operation of a ventilation and dust removal system for excavating faces of coal mining machines.

Background technique

At present, among the dust prevention measures for fully mechanized excavation faces in coal mines, the ventilation and dust removal system combined with press-in ventilation and dust removal by dust collectors is one of the most widely used dust prevention measures, and it is also the most proven by domestic and foreign practices. One of the effective measures.

However, during the excavation operation of the roadway, the gas concentration and dust concentration in the roadway may exceed the standard; at the same time, as the fully-mechanized roadway advances and the service time of the dust collector increases, the ratio of the suction and pressure air volume of the ventilation system, the dust collector Parameters such as load status will change. These hidden dangers may lead to safety accidents at any time.

It can be seen that the real-time monitoring of the operation status of the dust removal system and the formation of closed-loop control are important means to ensure the safe and efficient operation of the dust removal system of the fully mechanized excavation face, but there is still a lack of such a safe operation monitoring device.

Utility model content

The purpose of the utility model is to provide a coal mining machine excavation face ventilation and dust removal system safe operation monitoring device to solve the above problems.

In the embodiment of the present invention, a monitoring device for safe operation of the ventilation and dust removal system of coal mining machine excavation is provided, which includes an air volume measuring device for measuring the compressed air volume of the ventilation and dust removal system, a control box, and a The first methane concentration sensor, the second methane concentration sensor installed in the ventilation and dust removal system, the dust concentration sensor at the air inlet, and the dust concentration sensor at the air outlet;

The first methane concentration sensor, the second methane concentration sensor, the dust concentration sensor at the air inlet, and the dust concentration sensor at the air outlet are electrically connected to the control box.

Further, the air volume measuring device includes a differential pressure transmitter, a pressure gauge transmitter and a temperature transmitter.

Further, the monitoring device for safe operation of the ventilation and dust removal system for excavation of the coal mining machine also includes a transformer and a DC power supply;

The input end of the transformer is connected to the main circuit of the fan of the ventilation and dust removal system, and the output end of the transformer is respectively connected to the input end of the controller and the DC power supply;

The output end of the DC power supply is connected to the frequency controller.

Further, the monitoring device for safe operation of the ventilation and dust removal system for coal mining machine excavation also includes a control relay;

The control relays are respectively electrically connected to the controller and the output terminals of the DC power supply; the contacts of the control relays are connected in series to the main circuit of the fan of the ventilation and dust removal system.

Further, the monitoring device for safe operation of the ventilation and dust removal system for excavation of the coal mining machine also includes a liquid crystal display;

The liquid crystal display is electrically connected with the controller.

Further, it also includes a filter and an input reactor connected in series on the main circuit.

The safety operation monitoring device for the ventilation and dust removal system of coal mining machine excavation provided by the embodiment of the utility model measures the air supply volume of the ventilation and dust removal system through the air volume measurement device, and then the air volume measurement device sends the measured air supply volume to the controller, and the controller sends the air volume to the controller. The air supply volume is sent to the frequency controller, and the frequency controller obtains the control command according to the change of the air supply volume and sends the control command to the frequency converter. The exhaust air volume of the fan changes with the change of the air supply volume. That is, for example, when the air volume measuring device measures that the air supply volume of the ventilation and dust removal system is insufficient, the control box can reduce the frequency of the dust collector, thereby reducing the air volume of the dust collector to ensure a stable pumping pressure ratio; The operation monitoring device can control the exhaust air volume of the ventilation and dust removal system to change with the change of the air supply volume, so as to ensure that the extraction pressure ratio is the set extraction pressure ratio, thereby avoiding the gas accumulation caused by the circulating air formed in the overlapping sections. Also refer to Figure 3, the above process mainly includes the measurement of the air volume at the air outlet of the working surface, the monitoring of the exhaust air volume and the extraction pressure ratio, specifically including preheating and initialization; reading the set extraction pressure ratio; measuring the air volume at the air supply end ; Calculate the pumping pressure ratio, and finally carry out the feedback control of the frequency of the dust collector.

Description of drawings

Fig. 1 shows the circuit schematic diagram of the safety operation monitoring device for controlling the ventilation and dust removal system of the coal mining machine excavation face of the utility model embodiment;

Fig. 2 shows the on-site layout diagram of the safety operation monitoring device for controlling the ventilation and dust removal system of the mining machine excavation face in the embodiment of the present invention;

Fig. 3 shows the operation flow chart of the monitoring device for controlling the safe operation of the ventilation and dust removal system of the excavation face of the coal mining machine according to the embodiment of the utility model.

Detailed ways

The utility model will be described in further detail below through specific implementation examples and in conjunction with the accompanying drawings.

As shown in Figure 1, it is a monitoring device for controlling the safe operation of the ventilation and dust removal system of the mining machine excavation provided by the present embodiment, including an air volume measuring device 107 for measuring the compressed air volume of the ventilation and dust removal system, a control box, and an air duct overlapping The first methane concentration sensor 201 in the section, the second methane concentration sensor 202 installed in the ventilation and dust removal system, the dust concentration sensor 203 at the air inlet, and the dust concentration sensor 204 at the air outlet;

The first methane concentration sensor 201, the second methane concentration sensor 202, the air inlet dust concentration sensor 203, and the air outlet dust concentration sensor 204 are electrically connected to the control box.

Further, the air volume measuring device 107 includes a differential pressure transmitter, a pressure gauge transmitter and a temperature transmitter.

Further, the monitoring device for safe operation of the ventilation and dust removal system for excavation of the coal mining machine also includes a transformer and a DC power supply;

The input end of the transformer is connected to the main circuit of the blower fan 108 of the ventilation and dust removal system, and the output end of the transformer is respectively connected to the input ends of the controller 103 and the DC power supply;

The output end of the DC power supply is connected to the frequency controller 105 .

Further, the monitoring device for safe operation of the ventilation and dust removal system for coal mining machine excavation also includes a control relay;

The control relays are electrically connected to the controller 103 and the output terminals of the DC power supply 102 respectively; the contacts of the control relays are connected in series to the main circuit of the fan of the ventilation and dust removal system.

Further, the monitoring device for safe operation of the ventilation and dust removal system for excavation of the coal mining machine also includes a liquid crystal display 106;

The liquid crystal display 106 is electrically connected to the controller 103 .

Furthermore, the monitoring device for safe operation of the ventilation and dust removal system for excavation of coal mining machines further includes a filter 111 and an input reactor 110 connected in series to the main circuit.

In the embodiment of the utility model, the gas concentration in the overlapping section of the air cylinder and in the dust removal system is detected by the first methane concentration sensor arranged in the overlapping section of the air cylinder and the second methane concentration sensor in the ventilation and dust removal system, and the The detected gas concentration is sent to the frequency controller. When any one of the values exceeds the set alarm value (prompting that the overlapping section may form circulating air), the operator will be reminded to take corresponding measures in time; when any one of the values exceeds the set power-off value, the ventilation and dust removal system and the monitoring system will be automatically cut off. The power supply of the device realizes the protection of the ventilation and dust removal system and the monitoring device. That is to say, the monitoring device of this embodiment can not only prevent the circulating air from being formed in the overlapping section of the blower duct, but also protect the ventilation and dust removal system and the monitoring device.

The monitoring of the power and frequency of the dust collector is beneficial to determine the operating status of the dust collector, and provides a basis for the air volume monitoring, frequency adjustment and protection of the dust collector. For example: when there is too much dust bonded to the filter inside the dust collector, the resistance of the dust collector will increase, the air volume will decrease, and the corresponding power of the dust collector will increase. When the control box monitors that the power of the dust collector increases, it can be judged that the resistance of the dust collector increases and the real-time air volume decreases, so the frequency of the dust collector can be increased to ensure the exhaust air volume; when the power increases rapidly, in order to prevent the current from being too large When the dust collector is burned, the control box can be powered off to protect the dust collector (that is, to realize the overpower protection function of the dust collector).

The dust concentration at the air inlet and outlet is detected by setting the dust concentration sensor at the air inlet and outlet. And send the detected dust concentration to the control box. When a certain value exceeds the set value, it will alarm in time and remind the operators to take corresponding measures.

Among them, through the dust concentration detection function of the dust concentration sensor at the air inlet and outlet and the identification and control function of the control box, the detection and monitoring of dust and gas as well as targeted protection and control measures can be completed; then along with the control of dust removal In the process of increasing the power of the dust collector, the air volume monitoring and over-power protection of the dust collector will be completed in coordination; that is, when the power increases rapidly to a certain extent, the control box can perform power-off operation to protect the dust collector (that is, to realize the over-power protection of the dust collector function); in addition, electrical components such as transformer 101, control relay 104, and switch 112 are shown in FIG.

Refer to Figure 2 for the on-site layout of the monitoring device for controlling the safe operation of the ventilating and dust removal system of the mining machine excavation face in the embodiment of the utility model, wherein V represents the air volume monitoring device; D represents the concentration and dust removal efficiency monitoring device; P represents the power monitoring device; CH4 represents Gas monitoring device; the direction of the arrow in the figure indicates the flow direction of the wind direction; the line between the press-in ventilator and the head-on direction is the air duct, and the connection between each equipment indicates; the gas monitoring device and the dust collector The connection and the connection between the air volume monitoring device and the dust collector represent the transmission of the collected signal; the connection between the control box and the air volume monitoring device and the gas monitoring device respectively represent the transmission signal; the signal between the control box and the dust collector represents Execution signal.

For the air volume measuring device 107, a sensor may be used to detect the air volume, and of course other methods may also be used. Preferably, the air flow measurement device 107 includes a differential pressure transmitter, a pressure gauge transmitter and a temperature transmitter; the differential pressure transmitter, the pressure gauge transmitter and the temperature transmitter are respectively electrically connected to the controller. Specifically, the differential pressure transmitter can be arranged at both ends of the air cylinder to measure the pressure difference between the two ends of the air cylinder, the pressure gauge transmitter can detect the pressure in the air cylinder, and the temperature sensor can detect the temperature in the air cylinder. After the detected data are sent to the controller, the controller can obtain the air supply volume according to the data, and the air supply volume detected by the air duct measurement device has high precision and strong real-time performance.

As for the controller, the controller may preferably be a PLC controller. A pumping ratio can be preset in the controller. After the air volume detection device detects the air supply volume, the expected exhaust air volume can be obtained according to the supply-to-draw ratio. The supply and extraction ratio is the ratio of the supply air volume to the exhaust air volume. After obtaining the expected air volume, the controller obtains the expected frequency to be achieved by the fan and sends the expected frequency to the frequency controller, and the frequency controller sends a frequency conversion command to the frequency converter according to the expected frequency, so that the operating frequency of the fan reaches the expected frequency , so that the exhaust air volume can be adjusted at any time according to the working conditions while changing with the change of the air supply volume.

Further, the monitoring device also includes a filter 111 and an input reactor 110 connected in series to the main circuit. The filter 111 and the input reactor 110 can avoid the influence of the frequency converter 109 on the main circuit during frequency conversion.

The monitoring device of this embodiment can realize the air volume ratio control function, so that the supply and extraction ratio of the ventilating and dust removal system of the excavation face can be adjusted according to a certain ratio, so that the exhaust air volume can change with the change of the air supply volume. In addition, the monitoring device also has a safety protection function, that is, the power-off protection of the ventilation and dust removal system against the gas exceeding the limit and the over-power protection of the fan power over-power. Finally, the monitoring device also has detection and fault diagnosis functions, that is, it can automatically monitor parameters such as air supply volume, exhaust air volume, gas concentration, dust concentration, and fan power of the excavation surface, and display them on the LCD. The operation of the sensor is monitored, and if each sensor fails, the fault information of the sensor will be displayed automatically. It should be noted again that the above-mentioned functions of the monitoring device can be realized by a PLC controller or a single-chip microcomputer.

Obviously, those skilled in the art should understand that the various controllers of the above-mentioned utility model can be realized by general-purpose computing devices, and they can be concentrated on a single computing device, or distributed on a network formed by multiple computing devices , alternatively, they can be implemented with executable program codes of the computing device, thus, they can be stored in the storage device and executed by the computing device, or they can be made into individual integrated circuit modules respectively, or the Multiple modules or steps are implemented as a single integrated circuit module. As such, the invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (7)

1. a digging surface of coal mining machine ventilating and purifying air system safe operation monitor for electric, it is characterized in that, comprising control box, for measuring the apparatus for measuring air quantity of the pressure air quantity of ventilating and purifying air system, the first sensing methane concentration device be arranged in air duct overlay segment, the second sensing methane concentration device, air inlet sensor of dust concentration, the air outlet sensor of dust concentration be arranged in ventilating and purifying air system;

Described pressure wind apparatus for measuring air quantity, described first sensing methane concentration device, described second sensing methane concentration device, described air inlet sensor of dust concentration, described air outlet sensor of dust concentration are electrically connected with described control box;

Described control box is electrically connected with fly-ash separator, and regulates fly-ash separator frequency, monitoring fly-ash separator running status in real time.

2. supervising device according to claim 1, is characterized in that, described control box has each sensor concentration of display, regulates fly-ash separator frequency, monitors fly-ash separator running status and calculate the functions such as fly-ash separator air quantity accordingly.

3. supervising device according to claim 1, is characterized in that, described apparatus for measuring air quantity comprises differential pressure transmitter, tensimeter send device and temperature transmitter.

4. supervising device according to claim 2, is characterized in that, also comprises transformer and direct supply;

The input end of described transformer is connected on the main circuit of the blower fan of ventilating and purifying air system, the output terminal difference connection control device of described transformer and the input end of described direct supply;

The output terminal rate of connections controller of described direct supply.

5. supervising device according to claim 4, is characterized in that, also comprises pilot relay;

Described pilot relay is electrically connected with the output terminal of described controller and described direct supply respectively; The contact series of described pilot relay is on the main circuit of the blower fan of ventilating and purifying air system.

6. supervising device according to claim 5, is characterized in that, also comprises LCDs;

Described LCDs is electrically connected with described controller.

7. supervising device according to claim 6, is characterized in that, also comprises series connection wave filter on the main circuit and input reactance device.