A control system and control method for air compressor in coal mine

Abstract

The present application discloses a control system for an underground air compressor in a coal mine and a control method thereof, the method comprising: a control system for an underground air compressor in a coal mine, comprising a main controller module, a multi-channel temperature detection module, a multi-channel pressure detection module and a function expansion module; the main controller module is connected to a remote user control terminal; the multi-channel temperature detection module detects the temperature of an air compressor component and outputs a temperature detection signal; the multi-channel pressure detection module detects the pressure of an air compressor component and outputs a pressure detection signal; according to a temperature comparison result, the air compressor component is controlled to be in an automatic temperature control state or a temperature protection state; and according to a pressure comparison result, the air compressor component is controlled to be in an automatic pressure control state or a pressure protection state; the function expansion module provides a customized program development function; the present application meets the diversified function control requirements of the control system of an underground air compressor in a coal mine, and has the effect of improving the control effect of the control system of an underground air compressor in a coal mine.

Description

Technical Field

[0001] The present application relates to the technical field of air compressors, and in particular to a control system and a control method for an air compressor in an underground coal mine. Background Art

[0002] Coal mine underground explosion-proof air compressor, also known as underground explosion-proof air compressor, is a kind of equipment specially used for underground operations in coal mines. Its main function is to provide compressed air for coal miners to drive the operation of underground equipment in coal mines and carry out on-site mine work; underground air compressors are usually driven by gas or electric motors, and use compressed air to realize the power supply of underground equipment in coal mines.

[0003] The existing control systems for coal mine underground air compressors can only realize limited control functions, such as the common start-stop control functions, and the control program logic of the control system is fixed, which cannot meet the user's demand for diversified functional control of the control system for coal mine underground air compressors. Therefore, there is room for improvement. Summary of the invention

[0004] In order to meet the user's demand for diversified functional control of the control system of the coal mine underground air compressor and improve the control effect of the control system of the coal mine underground air compressor, the present application provides a control system and a control method of the coal mine underground air compressor.

[0005] In the first aspect, the invention objective of the present application is achieved by adopting the following technical solutions:

[0006] A control system for an underground air compressor in a coal mine, comprising a main controller module, a multi-channel temperature detection module, a multi-channel pressure detection module and a function expansion module;

[0007] The main controller module is provided at the air compressor, and the main controller module is connected to a communication connection module for connecting to a remote user control terminal, so that the main controller module controls the operation state of the air compressor based on the remote control instruction received from the remote user control terminal; the air compressor includes a plurality of air compressor components, and each of the air compressor components is associated with a component device identifier;

[0008] The multi-channel temperature detection module is used to detect the temperature of the multiple air compressor components and output the temperature detection signal to the main controller module; the multi-channel pressure detection module is used to detect the pressure of the multiple air compressor components and output the pressure detection signal to the main controller module;

[0009] The main controller module is provided with a temperature threshold signal and a pressure threshold signal in one-to-one correspondence based on the component device identification of each of the air compressor components, and controls the air compressor components to switch to a temperature automatic control state or a temperature protection state according to a temperature comparison result between the temperature detection signal of the air compressor component and the corresponding temperature threshold signal; and controls the air compressor components to switch to a pressure automatic control state or a pressure protection state according to a pressure comparison result between the pressure detection signal of the air compressor component and the corresponding pressure threshold signal;

[0010] The function expansion module is connected to the function expansion end of the main controller module, and the function expansion module is used to provide a function expansion interface for the main controller module to provide a customized program development function.

[0011] By adopting the above technical scheme, the control system of the air compressor in the coal mine underground realizes the functions of remote control, automatic temperature control, temperature protection, pressure detection and pressure protection, and is also provided with a function expansion interface with function expansion. Users can develop customized function programs through the main controller module combined with the function expansion interface of the function expansion module to achieve the purpose of function expansion of the air compressor in the coal mine underground; specifically, for the temperatures of multiple air compressor components in the air compressor, such as coolers, bearings, motor windings, oil and gas barrels, etc., the temperatures of multiple air compressor components are detected one by one through a multi-channel temperature detection module to obtain temperature detection signals, and temperature threshold signals are respectively set corresponding to each air compressor component, so that the main controller module can judge whether it is in the temperature automatic control state or the temperature protection state according to the temperature comparison result between the temperature detection signal of each air compressor component and the temperature threshold signal.

[0012] Similarly, the exhaust pressure, oil injection pressure and paint bucket pressure of multiple air compressor components in the air compressor are detected to obtain a pressure detection signal, and a pressure threshold signal is set corresponding to the pressure detection signal of each air compressor component, so that the main controller module can judge whether it is in the pressure automatic control state or the pressure protection state according to the pressure comparison result of the pressure detection signal of each air compressor component and the pressure threshold signal, so that the coal mine underground air compressor can realize the functions of automatic loading and automatic unloading based on the exhaust pressure size; the control system of the coal mine underground air compressor with customized function expansion of the air compressor having multi-channel temperature detection control, multi-channel pressure detection control, remote communication control and function expansion interface in the present application is conducive to meeting the user's diversified function control requirements for the control system of the coal mine underground air compressor and improving the control effect of the control system of the coal mine underground air compressor.

[0013] In a preferred example of the present application: the air compressor assembly includes a motor winding, the temperature detection signal of the motor winding includes an A-phase winding temperature detection signal, a B-phase winding temperature detection signal and a C-phase winding temperature detection signal; the temperature threshold signal of the motor winding also includes a phase difference threshold signal and a phase maximum threshold signal;

[0014] The main controller module calculates and obtains the phase temperature difference between the A-phase winding temperature detection signal, the B-phase winding temperature detection signal and the C-phase winding temperature detection signal to obtain a phase temperature difference signal, compares the phase temperature difference signal with the phase difference threshold signal, and outputs a motor winding abnormality prompt signal to the remote user control terminal when the phase temperature difference signal is greater than the phase difference threshold signal;

[0015] The main controller module compares the A-phase winding temperature detection signal, the B-phase winding temperature detection signal and the C-phase winding temperature detection signal with the phase-split maximum threshold signal one by one to obtain corresponding winding temperature comparison results; when the winding temperature comparison result meets the preset winding temperature warning condition, it outputs winding temperature abnormality prompt information.

[0016] By adopting the above technical scheme, in actual work, the motor winding often has three-phase load imbalance or temperature differences between different phases due to faults such as the cooling system of the air compressor, winding short circuit, poor contact, etc. In order to facilitate the detection of the temperature change of the motor winding, real-time temperature detection is performed on the three-phase temperature of the motor winding, and the three-phase temperature difference of the motor winding is calculated in real time based on the winding temperature detection signal between the three phases to obtain the phase temperature difference, and the phase temperature difference is compared with the corresponding phase difference threshold signal. When the phase temperature difference signal is greater than the phase difference threshold signal, it indicates that the temperature of the motor winding is abnormal, and an abnormal motor winding prompt signal is output to prompt the user to check and take treatment measures in time; and the A-phase winding temperature detection signal, the B-phase winding temperature detection signal, and the C-phase winding temperature detection signal of the motor winding are respectively compared with the phase maximum threshold signal. The phase maximum threshold signal represents the upper temperature limit of the motor winding. When the winding temperature comparison result meets the winding temperature warning condition, the winding temperature abnormality prompt information is output to prompt the user that the temperature of the motor winding is too high at this time.

[0017] In a preferred example of the present application: the air compressor assembly includes a cooler, the multi-channel temperature detection module includes an ambient temperature sensor for detecting the ambient temperature, and the control system further includes:

[0018] When the split-phase temperature difference signal is greater than the split-phase difference threshold signal, or when the winding temperature comparison result meets a preset winding temperature early warning condition;

[0019] The main controller module sends command detection signals to the motor winding, the ambient temperature sensor and the cooler respectively, and receives data detection signals fed back by the command detection signals to generate data detection results;

[0020] The main controller module determines whether there is fault abnormal temperature data based on the data detection result, generates fault type information if there is fault abnormal temperature data, and sends the fault type information to the remote user control terminal.

[0021] By adopting the above technical solution, when the motor winding has a temperature abnormality, in order to analyze the cause of the temperature abnormality and the temperature conditions of the remaining air compressor components and obtain the cause of the temperature fault and the type of fault information, the main controller module sends a command detection signal to the motor winding, the ambient temperature sensor, and the cooler to detect the fault conditions of the motor winding, the ambient temperature sensor, and the cooler. When the motor winding, the ambient temperature sensor, and the cooler fail, the corresponding components have no signal output, and the corresponding data detection results are generated to determine the location and components of the fault abnormality based on the data detection results, so as to accurately locate the components with temperature abnormalities or operating failures, and facilitate timely maintenance and abnormal prompts.

[0022] In a preferred example of the present application: the temperature detection signal of the multi-channel temperature detection module includes an ambient temperature detection signal;

[0023] The main controller module compares the preset reference threshold signal with the real-time detected ambient temperature detection signal to obtain a temperature threshold difference;

[0024] The temperature threshold difference is compared with a preset first critical difference and a preset second critical difference,

[0025] When the temperature threshold difference is greater than or equal to the preset first critical difference and less than the preset second critical difference, adjusting the temperature threshold signal by increasing or decreasing it based on the first temperature adjustment ratio;

[0026] When the temperature threshold difference is greater than the second critical difference, adjusting the temperature threshold signal by increasing or decreasing it based on a second temperature adjustment ratio;

[0027] When the temperature threshold signal is adjusted to be enlarged or reduced, a temperature threshold signal prompt instruction is generated and output to the remote user control terminal.

[0028] By adopting the above technical scheme, the temperature values ​​of the high temperature environment and the low temperature environment in the coal mine are quite different. Using a unified temperature threshold signal for temperature detection is not conducive to improving the accuracy of temperature detection. In order to reduce the large changes in the external environment temperature, the signal size comparison accuracy of the temperature detection of the air compressor component is affected. The present application adopts a dynamic temperature threshold for adjustment and then comparison. Specifically, the reference threshold signal is a temperature threshold reference signal set under normal temperature. The main controller module compares the reference threshold signal with the ambient temperature detection signal of the surrounding environment detected in real time to analyze the temperature difference between the real-time ambient temperature and the normal temperature environment to obtain the temperature threshold difference, and then compares the temperature threshold difference with the first critical difference and the second critical difference to determine whether to expand or reduce the temperature threshold signal by the first temperature adjustment ratio or by the second temperature adjustment ratio according to the comparison result of the temperature threshold difference and the first critical difference and the second critical difference, so as to complete the update of the temperature threshold signal, thereby improving the accuracy of temperature detection of multiple air compressor components of the air compressor and the control reliability of the temperature automatic control state.

[0029] In a preferred example of the present application: the air compressor assembly includes a control transformer, a high-voltage fuse, and a low-voltage fuse, wherein the high-voltage fuse is connected to the high-voltage secondary side of the control transformer, and the low-voltage fuse is connected to the low-voltage secondary side of the control transformer;

[0030] The air compressor assembly further comprises an exhaust pipe, and the pressure detection signal comprises an exhaust pressure detection signal of the exhaust pipe;

[0031] The main controller module is provided with an exhaust low-pressure threshold signal and an exhaust high-pressure threshold signal based on the exhaust pressure detection signal; when the main controller module detects that the exhaust pressure detection signal of the exhaust pipe is less than the exhaust low-pressure threshold signal, the main controller module controls the air compressor to switch to a loading state within a loading control time to increase the output of compressed air; when the main controller module detects that the exhaust pressure detection signal of the exhaust pipe is greater than the exhaust high-pressure threshold signal, the main controller module controls the air compressor to switch to an unloading state within an unloading control time to reduce the output of compressed air.

[0032] By adopting the above technical solution, the control transformer is also called a multi-point transformer, and the high-voltage fuse provides a high-voltage protection function on the high-voltage secondary side of the control transformer, while the low-voltage fuse provides a low-voltage protection function on the low-voltage secondary side of the control transformer; further, the air compressor of the present application can also realize the functions of automatic loading and unloading based on the exhaust pressure detection signal of the exhaust pipe. Specifically, during the actual operation of the air compressor, two situations often occur. The first situation is that the compressed air output of the air compressor is low and the air pressure in the coal mine is low, that is, when the exhaust pressure detection signal of the exhaust pipe is detected to be less than the exhaust low-pressure threshold signal, the air compressor will automatically load and unload the air. The overload control time controls the air compressor to be in an automatic loading state to ensure normal ventilation and normal operation of other equipment in the coal mine underground; the second situation is that the compressed air output of the air compressor is too high and the system exhaust pressure reaches the upper pressure limit, that is, the exhaust pressure detection signal of the exhaust pipe is detected to be greater than the exhaust high pressure threshold signal. In order to avoid excessive pressurization of the air compressor and energy waste, the air compressor switches to unloading mode and reduces the production of compressed air based on the unloading control time. At this time, the power consumption of the air compressor is reduced to achieve the purpose of energy saving, which is conducive to maintaining the pressure in the exhaust pipe stable and convenient for maintenance of the air compressor.

[0033] In a preferred example of the present application: the air compressor is connected to a magnetic starter for providing power supply to the air compressor, and the magnetic starter controls the start and stop of the air compressor based on the start and stop control signal received from the main controller module, and the control system further includes:

[0034] The magnetic starter sends an operation detection signal to the air compressor in real time to detect whether the air compressor has received a start instruction; if no operation feedback signal is received within a preset time, a secondary operation detection signal is sent to the main controller module, the ambient temperature sensor, and the communication connection module to generate an operation detection result;

[0035] If only the ambient temperature detection signal and the communication signal are obtained in the operation detection result, the magnetic starter sends an analog operational amplifier signal to the processor of the main controller module.

[0036] By adopting the above technical solution, the magnetic starter connects the air compressor to the power supply and controls the connection and disconnection between the air compressor and the power supply, so as to realize the remote start and stop control function for the air compressor through the magnetic starter; since the air compressor does not work in the operating state for a long time, such as the air compressor is controlled to switch to the on state or the off state based on the automatic switch control method, in order to judge the operating state of the main controller module, the ambient temperature sensor, and the communication connection module in the air compressor, the operating detection signal is used to judge once every preset time period whether the operating feedback signal is received within the time period, and generate the operating detection result; since the main controller module, the ambient temperature sensor, and the communication connection module are in the normal operating state There is an operation feedback signal output below, and the operation feedback signal cannot be fed back in the event of a fault. Therefore, the operation detection result can be used to determine whether the operation of the main controller module, the ambient temperature sensor, and the communication connection module is abnormal; and when only the ambient temperature detection signal and the communication signal are obtained in the operation detection result, the processor of the main controller module may be faulty. At this time, an analog operational amplifier signal is sent to the processor through the magnetic starter to further determine the operating status of the processor, thereby realizing the working status detection of multiple air compressor components of the air compressor and timely diagnosis of the fault status, improving the fault diagnosis efficiency and intelligent control effect of the air compressor in the coal mine, and facilitating timely rescue measures when a fault occurs.

[0037] In a preferred example of the present application: the air compressor assembly includes a backup power supply; if only the ambient temperature detection signal and the communication signal are obtained in the operation detection result, the magnetic starter sends an analog operational amplifier signal to the processor of the main controller module, and further includes:

[0038] Based on the analog operational amplifier signal, if a startup instruction of the processor of the main controller module is received and the air compressor is not started, a power supply test instruction is sent to the backup power supply;

[0039] Based on the power supply test instruction, if the test instruction feedback signal is not received, air compressor fault information is generated as fault type information.

[0040] By adopting the above technical solution, the ambient temperature sensor and the communication connection module use a power supply different from that of the main controller module; when the main controller module does not feedback the operation detection signal, that is, when the ambient temperature detection signal and the communication signal are obtained in the operation detection result, the main controller module may be faulty. At this time, a power supply test instruction is issued through the backup power supply, and the processor of the air compressor is directly powered by the backup power supply, and a start instruction is sent to the processor. If the air compressor still does not start, the air compressor is determined to be faulty, so as to achieve accurate judgment of the air compressor failure.

[0041] In the second aspect, the invention objective of the present application is achieved by adopting the following technical solutions:

[0042] A control method for an underground air compressor in a coal mine is applied to the control system of the underground air compressor in a coal mine as described above. The control method comprises:

[0043] Collecting remote control instructions from a remote user control terminal, controlling the operating state of the air compressor based on the received remote control instructions, and controlling the start and stop of the air compressor;

[0044] Detecting the temperatures of the plurality of air compressor components to obtain temperature detection signals; detecting the pressures of the plurality of air compressor components to obtain pressure detection signals; associating a component device identifier with each of the air compressor components, and associating a temperature threshold signal with a pressure threshold signal based on the component device identifier of each of the air compressor components;

[0045] Compare the temperature detection signals of the plurality of air compressor components with the corresponding temperature threshold signals in real time to obtain a temperature comparison result; control the corresponding air compressor components to switch to a temperature automatic control state or a temperature protection state according to the temperature comparison result; compare the pressure detection signals of the plurality of air compressor components with the corresponding pressure threshold signals in real time to obtain a pressure comparison result; control the corresponding air compressor components to switch to a pressure automatic control state or a pressure protection state according to the pressure comparison result;

[0046] According to the function expansion interface of the main controller module and the function expansion module, when the function expansion program instruction is obtained, the corresponding expansion function is displayed or executed.

[0047] By adopting the above technical scheme, the temperatures of multiple air compressor components in the air compressor, such as coolers, bearings, motor windings, oil and gas barrels, etc., are detected one by one by a multi-channel temperature detection module to obtain temperature detection signals, and temperature threshold signals are set corresponding to each air compressor component, so that the main controller module can judge whether it is in the automatic temperature control state or the temperature protection state according to the temperature comparison result between the temperature detection signal of each air compressor component and the temperature threshold signal.

[0048] Similarly, the exhaust pressure, oil injection pressure and paint bucket pressure of multiple air compressor components in the air compressor are detected to obtain a pressure detection signal, and a pressure threshold signal is set corresponding to the pressure detection signal of each air compressor component, so that the main controller module can judge whether it is in the pressure automatic control state or the pressure protection state according to the pressure comparison result of the pressure detection signal of each air compressor component and the pressure threshold signal, so that the coal mine underground air compressor can realize the functions of automatic loading and automatic unloading based on the exhaust pressure size; the control system of the coal mine underground air compressor with customized function expansion of the air compressor having multi-channel temperature detection control, multi-channel pressure detection control, remote communication control and function expansion interface in the present application is conducive to meeting the user's diversified function control requirements for the control system of the coal mine underground air compressor and improving the control effect of the control system of the coal mine underground air compressor.

[0049] In summary, the present application includes at least one of the following beneficial technical effects:

[0050] 1. For the temperature of multiple air compressor components in the air compressor, such as coolers, bearings, motor windings, oil and gas barrels, etc., the temperature of multiple air compressor components is detected one by one through a multi-channel temperature detection module to obtain a temperature detection signal, and a temperature threshold signal is set corresponding to each air compressor component, so that the main controller module can judge whether it is in the temperature automatic control state or the temperature protection state according to the temperature comparison result between the temperature detection signal of each air compressor component and the temperature threshold signal; similarly, the exhaust pressure, oil injection pressure and paint barrel pressure of multiple air compressor components in the air compressor are detected to obtain a pressure detection signal, and the pressure detection signal of each air compressor component is detected. The signals are respectively provided with pressure threshold signals, so that the main controller module can judge whether it is in the pressure automatic control state or the pressure protection state according to the pressure comparison result of the pressure detection signal of each air compressor component and the pressure threshold signal, so that the coal mine underground air compressor can realize the functions of automatic loading and automatic unloading based on the exhaust pressure size; the control system of the coal mine underground air compressor with air compressor customized function expansion with multi-channel temperature detection control, multi-channel pressure detection control, remote communication control and function expansion interface of the present application is conducive to meeting the user's diversified function control requirements for the control system of the coal mine underground air compressor, and improving the control effect of the control system of the coal mine underground air compressor;

[0051] 2. In actual operation, the motor winding often has unbalanced three-phase load or temperature differences between different phases due to faults such as the air compressor cooling system, winding short circuit, poor contact, etc. In order to facilitate the detection of temperature changes in the motor winding, real-time temperature detection is performed on the three-phase temperature of the motor winding, and the three-phase temperature difference of the motor winding is calculated in real time based on the winding temperature detection signal between the three phases to obtain the phase temperature difference, and the phase temperature difference is compared with the corresponding phase difference threshold signal. When the phase temperature difference signal is greater than the phase difference threshold signal, it indicates that the temperature of the motor winding is abnormal, and an abnormal motor winding prompt signal is output to prompt the user to check and take treatment measures in time; and the A-phase winding temperature detection signal, the B-phase winding temperature detection signal, and the C-phase winding temperature detection signal of the motor winding are compared with the phase maximum threshold signal respectively. The phase maximum threshold signal represents the upper temperature limit of the motor winding. When the winding temperature comparison result meets the winding temperature warning condition, the winding temperature abnormality prompt information is output to prompt the user that the temperature of the motor winding is too high at this time;

[0052] 3. When the motor winding has abnormal temperature, in order to analyze the cause of the abnormal temperature and the temperature conditions of the other air compressor components, and obtain the cause of the temperature fault and the type of fault information, the main controller module sends a command detection signal to the motor winding, the ambient temperature sensor, and the cooler to detect the fault conditions of the motor winding, the ambient temperature sensor, and the cooler. When the motor winding, the ambient temperature sensor, and the cooler fail, the corresponding components have no signal output, and the corresponding data detection results are generated to determine the location and components of the abnormal fault based on the data detection results, so as to accurately locate the components with abnormal temperature or operation failure, and facilitate timely maintenance and abnormal prompts. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a structural diagram of a control system of an underground air compressor in a coal mine in one embodiment of the present application;

[0054] Figure 2 This is a circuit diagram of a control system for an underground air compressor in a coal mine in one embodiment of the present application;

[0055] Figure 3 This is a functional schematic diagram of a wiring terminal of a function expansion module in a control system of an underground air compressor in a coal mine in one embodiment of the present application;

[0056] Figure 4 This is a flow chart of a control method for an underground air compressor in a coal mine in one embodiment of the present application;

[0057] Description of reference numerals:

[0058] 1. Main controller module; 2. Multi-channel temperature detection module; 3. Function expansion module; 4. Touch screen; 5. Control transformer. DETAILED DESCRIPTION

[0059] The present application is further described in detail below in conjunction with the accompanying drawings.

[0060] In one embodiment, if Figure 1 and Figure 2 As shown, the present application discloses a control system for an underground air compressor in a coal mine, the control system comprising a main controller module 1, a multi-channel temperature detection module 2, a multi-channel pressure detection module and a function expansion module 3; the main controller module 1 is arranged in the air compressor, and the main controller module 1 is connected with a communication connection module for connecting a remote user control terminal, so that the main controller module 1 controls the operation state of the air compressor based on the remote control command received from the remote user control terminal; the air compressor comprises a plurality of air compressor components, each of which is associated with a component device identifier; the multi-channel temperature detection module 2 is used to detect the temperature of a plurality of air compressor components and output a temperature detection signal to the main controller module 1; the multi-channel pressure detection module is used to detect the pressure of a plurality of air compressor components and output a pressure detection signal to the main controller module 1; for the temperature of a plurality of air compressor components in the air compressor, such as a cooler, a bearing, a motor winding, an oil and gas barrel, an exhaust pipe, etc., the temperature of the plurality of air compressor components is detected one by one by the multi-channel temperature detection module 2 to obtain a temperature detection signal; the exhaust pressure, the oil injection pressure and the paint bucket pressure of the plurality of air compressor components in the air compressor are detected to obtain a pressure detection signal.

[0061] like Figure 1 and Figure 2 As shown, the main controller module 1 is provided with a temperature threshold signal and a pressure threshold signal based on the component equipment identification of each air compressor component, and controls the air compressor component to switch to the temperature automatic control state or the temperature protection state according to the temperature comparison result between the temperature detection signal of the air compressor component and the corresponding temperature threshold signal; and controls the air compressor component to switch to the pressure automatic control state or the pressure protection state according to the pressure comparison result between the pressure detection signal of the air compressor component and the corresponding pressure threshold signal; the function expansion module is connected to the function expansion end of the main controller module 1, and the function expansion module is used to provide the main controller module 1 with a function expansion interface of a customized program development function; the user can develop a customized function program through the main controller module 1 in combination with the function expansion interface of the function expansion module to achieve the purpose of function expansion of the air compressor underground in the coal mine.

[0062] like Figure 2As shown, in this embodiment, the air compressor is also provided with a touch screen 4, on which are provided a plurality of functional touch buttons of control functions, so as to press and control the air compressor based on the user's pressing operation. The model of the main controller module 1 is H2U-8A91G-XP, and the multi-channel temperature detection module 2 is a PT100 temperature transmitter; the function expansion module adopts an analog input submodule and a thermal resistor module, and the model of the analog input submodule is H2U-4ADR, and the thermal resistor module is H2U-4PTR; the outer side of the air compressor housing is provided with a communication terminal for connecting the lead of the communication connection module and a plurality of terminals for connecting external devices such as a magnetic starter.

[0063] like Figure 2 As shown, the air compressor component includes a motor winding, and the temperature detection signal of the motor winding includes an A-phase winding temperature detection signal, a B-phase winding temperature detection signal and a C-phase winding temperature detection signal; the temperature threshold signal of the motor winding also includes a phase difference threshold signal and a phase maximum threshold signal; the main controller module 1 calculates and obtains the phase temperature difference between the A-phase winding temperature detection signal, the B-phase winding temperature detection signal and the C-phase winding temperature detection signal to obtain the phase temperature difference signal, compares the phase temperature difference signal with the phase difference threshold signal, and outputs a motor winding abnormality prompt signal to the remote user control terminal when the phase temperature difference signal is greater than the phase difference threshold signal; the main controller module 1 compares the A-phase winding temperature detection signal, the B-phase winding temperature detection signal and the C-phase winding temperature detection signal with the phase maximum threshold signal one by one to obtain the corresponding winding temperature comparison result; when the winding temperature comparison result meets the preset winding temperature warning condition, the winding temperature abnormality prompt information is output.

[0064] In actual operation, the motor winding often has unbalanced three-phase load or temperature differences between different phases due to faults such as the cooling system of the air compressor, winding short circuit, poor contact, etc. In order to facilitate the detection of the temperature change of the motor winding, real-time temperature detection is performed on the three-phase temperature of the motor winding, and the three-phase temperature difference of the motor winding is calculated in real time based on the winding temperature detection signal between the three phases to obtain the phase temperature difference, and the phase temperature difference is compared with the corresponding phase difference threshold signal. When the phase temperature difference signal is greater than the phase difference threshold signal, it indicates that the temperature of the motor winding is abnormal, and an abnormal motor winding prompt signal is output to prompt the user to check and take treatment measures in time; and the A-phase winding temperature detection signal, the B-phase winding temperature detection signal, and the C-phase winding temperature detection signal of the motor winding are compared with the phase maximum threshold signal respectively. The phase maximum threshold signal represents the upper temperature limit of the motor winding. When the winding temperature comparison result meets the winding temperature warning condition, the winding temperature abnormality prompt information is output to prompt the user that the temperature of the motor winding is too high at this time.

[0065] like Figure 1 and Figure 2 As shown, the air compressor assembly includes a cooler, the multi-channel temperature detection module 2 includes an ambient temperature sensor for detecting the ambient temperature, and the control system also includes: when the phase temperature difference signal is greater than the phase difference threshold signal, or when the winding temperature comparison result meets the preset winding temperature warning condition; the main controller module 1 sends a command detection signal to the motor winding, the ambient temperature sensor and the cooler respectively, and receives a data detection signal fed back by the command detection signal to generate a data detection result; the main controller module 1 determines whether there is fault abnormal temperature data based on the data detection result, and if there is fault abnormal temperature data, generates fault type information, and sends the fault type information to the remote user control terminal. When the motor winding has abnormal temperature, in order to analyze the cause of the abnormal temperature and the temperature conditions of the remaining air compressor components, and obtain the cause of the temperature fault and the type of fault information, the main controller module 1 sends a command detection signal to the motor winding, the ambient temperature sensor, and the cooler to detect the fault conditions of the motor winding, the ambient temperature sensor, and the cooler. When the motor winding, the ambient temperature sensor, and the cooler fail, the corresponding components have no signal output, and the corresponding data detection results are generated to determine the location and components of the abnormal fault based on the data detection results, so as to accurately locate the components with abnormal temperature or operation failure, and facilitate timely maintenance and abnormal prompts.

[0066] like Figure 1 and Figure 2 As shown, the main controller module 1 compares the preset reference threshold signal with the real-time detected ambient temperature detection signal to obtain a temperature threshold difference, where the reference threshold signal is a temperature threshold reference signal set under normal temperature (35°C); compares the temperature threshold difference with a preset first critical difference and a preset second critical difference, and when the temperature threshold difference is greater than or equal to the preset first critical difference and less than the preset second critical difference, the temperature threshold signal is enlarged or reduced based on the first temperature adjustment ratio; when the temperature threshold difference is greater than the second critical difference, the temperature threshold signal is enlarged or reduced based on the second temperature adjustment ratio; the first critical difference and the second critical difference are the absolute values ​​of the difference data; when the temperature threshold signal is enlarged or reduced, a temperature threshold signal prompt instruction is generated and output to the remote user control terminal.

[0067] like Figure 1 and Figure 2As shown, the temperature values ​​of the high temperature environment and the low temperature environment in the coal mine are quite different. Using a unified temperature threshold signal for temperature detection is not conducive to improving the accuracy of temperature detection. In order to reduce the large changes in the external environment temperature, the signal size comparison accuracy of the temperature detection of the air compressor component is affected; the temperature threshold difference is compared with the first critical difference and the second critical difference, so as to determine whether to enlarge or reduce the temperature threshold signal by the first temperature adjustment ratio or by the second temperature adjustment ratio according to the comparison result of the temperature threshold difference and the first critical difference and the second critical difference; specifically: when the ambient temperature detection signal is lower than the reference threshold signal and the temperature threshold difference is greater than the first critical difference, the temperature threshold signal is reduced based on the first temperature adjustment ratio; when the ambient temperature detection signal is higher than the reference threshold signal and the temperature threshold difference is greater than the first critical difference, the temperature threshold signal is expanded based on the first temperature adjustment ratio; when the ambient temperature detection signal is lower than the reference threshold signal and the temperature threshold difference is greater than the second critical difference, the temperature threshold signal is reduced based on the second temperature adjustment ratio; when the ambient temperature detection signal is lower than the reference threshold signal and the temperature threshold difference is greater than the second critical difference, the temperature threshold signal is expanded based on the second temperature adjustment ratio;

[0068] like Figures 1 to 3 As shown, the air compressor assembly includes a control transformer 5, a high-voltage fuse, and a low-voltage fuse, the high-voltage fuse is connected to the high-voltage secondary side of the control transformer 5, and the low-voltage fuse is connected to the low-voltage secondary side of the control transformer 5; the air compressor assembly also includes an exhaust pipe, and the pressure detection signal includes an exhaust pressure detection signal of the exhaust pipe; the main controller module 1 is provided with an exhaust low-pressure threshold signal and an exhaust high-pressure threshold signal based on the exhaust pressure detection signal; when the main controller module 1 detects that the exhaust pressure detection signal of the exhaust pipe is less than the exhaust low-pressure threshold signal, the main controller module 1 controls the air compressor to switch to a loading state within the loading control time to increase the output of the compressed air; when the main controller module 1 detects that the exhaust pressure detection signal of the exhaust pipe is greater than the exhaust high-pressure threshold signal, the main controller module 1 controls the air compressor to switch to an unloading state within the unloading control time to reduce the output of the compressed air.

[0069] like Figures 1 to 3As shown, the air compressor can also realize the functions of automatic loading and unloading based on the exhaust pressure detection signal of the exhaust pipe. Specifically, during the actual operation of the air compressor, two situations often occur. The first situation is that the compressed air output of the air compressor is low and the air pressure in the coal mine is low, that is, it will be detected that the exhaust pressure detection signal of the exhaust pipe is less than the exhaust low pressure threshold signal. At this time, the air compressor is controlled to be in an automatic loading state through the loading control time to ensure the normal ventilation and normal operation of other equipment in the coal mine. The second situation is that the compressed air output of the air compressor is high and the system exhaust pressure reaches the upper limit of the pressure, that is, it will be detected that the exhaust pressure detection signal of the exhaust pipe is greater than the exhaust high pressure threshold signal. In order to avoid excessive pressurization of the air compressor and energy waste, the air compressor switches to unloading mode and reduces the production of compressed air based on the unloading control time. At this time, the power consumption of the air compressor is reduced to achieve the purpose of energy saving.

[0070] like Figure 2 As shown, the air compressor is connected to a magnetic starter for providing power supply for the air compressor. The magnetic starter controls the start and stop of the air compressor based on the start-stop control signal received from the main controller module 1. The magnetic starter sends an operation detection signal to the air compressor in real time to detect whether the air compressor has received the start instruction; if no operation feedback signal is received within a preset time, a secondary operation detection signal is sent to the main controller module 1, the ambient temperature sensor, and the communication connection module to generate an operation detection result; if only the ambient temperature detection signal and the communication signal are obtained in the operation detection result, the magnetic starter sends a secondary operation detection signal to the main controller module 1. The processor sends an analog operational amplifier signal; since the main controller module 1, the ambient temperature sensor, and the communication connection module have an operation feedback signal output under normal operating conditions, the operation feedback signal cannot be fed back in the event of a fault, so that the operation detection result can be used to determine whether the operation of the main controller module 1, the ambient temperature sensor, and the communication connection module is abnormal; and when only the ambient temperature detection signal and the communication signal are obtained in the operation detection result, the processor of the main controller module 1 may be faulty. At this time, an analog operational amplifier signal is sent to the processor through the magnetic starter to further determine the operating status of the processor.

[0071] like Figure 2As shown, in one embodiment, the air compressor assembly includes a backup power supply; if only the ambient temperature detection signal and the communication signal are obtained in the operation detection result, the magnetic starter sends the analog operational amplifier signal to the processor of the main controller module 1, and further includes: based on the analog operational amplifier signal, if the startup instruction of the processor of the main controller module 1 is received and the air compressor is not started, a power supply test instruction is sent to the backup power supply; based on the power supply test instruction, if the test instruction feedback signal is not received, the air compressor fault information is generated as the fault type information; the ambient temperature sensor and the communication connection module in this embodiment use a power supply with a different power supply circuit from the main controller module 1; when the main controller module 1 does not feedback the operation detection signal, that is, when the ambient temperature detection signal and the communication signal are obtained in the operation detection result, the main controller module 1 may have a fault. At this time, a power supply test instruction is issued by the backup power supply, and the processor of the air compressor is directly powered by the backup power supply, and a startup instruction is sent to the processor. If the air compressor still does not start, the air compressor is determined to be faulty, so as to achieve accurate judgment of the air compressor fault.

[0072] The implementation principle of a control system for an underground air compressor in a coal mine according to an embodiment of the present application is as follows: for the temperatures of multiple air compressor components in the air compressor, such as coolers, bearings, motor windings, oil and gas barrels, etc., a multi-channel temperature detection module 2 detects the temperatures of the multiple air compressor components one by one to obtain temperature detection signals, and a temperature threshold signal is set corresponding to each air compressor component, so that the main controller module 1 can judge whether it is in an automatic temperature control state or a temperature protection state according to the temperature comparison result between the temperature detection signal of each air compressor component and the temperature threshold signal; similarly, the exhaust pressure, oil injection pressure and paint bucket pressure of the multiple air compressor components in the air compressor are detected to obtain a pressure detection signal, and A pressure threshold signal is set corresponding to the pressure detection signal of each air compressor component, so that the main controller module 1 can judge whether it is in the pressure automatic control state or the pressure protection state according to the pressure comparison result of the pressure detection signal of each air compressor component and the pressure threshold signal, so that the coal mine underground air compressor can realize the functions of automatic loading and automatic unloading based on the exhaust pressure size; the control system of the coal mine underground air compressor with customized function expansion of air compressor with multi-channel temperature detection control, multi-channel pressure detection control, remote communication control and function expansion interface in the present application is conducive to meeting the user's diversified function control needs of the control system of the coal mine underground air compressor and improving the control effect of the control system of the coal mine underground air compressor.

[0073] In one embodiment, referring to Figure 4 The present application also discloses a control method for an underground air compressor in a coal mine, which specifically comprises the following steps:

[0074] S1: Collect remote control instructions from the remote user control terminal, control the operating state of the air compressor based on the received remote control instructions, and control the start and stop of the air compressor.

[0075] In this embodiment, the control system of the air compressor in the coal mine underground realizes the functions of remote control, automatic temperature control, temperature protection, pressure detection and pressure protection.

[0076] S2: Detect the temperatures of multiple air compressor components to obtain temperature detection signals; detect the pressures of multiple air compressor components to obtain pressure detection signals; associate a component device identifier with each air compressor component, and associate a temperature threshold signal and a pressure threshold signal based on the component device identifier of each air compressor component.

[0077] Specifically, with respect to the temperatures of multiple air compressor components in the air compressor, such as coolers, bearings, motor windings, oil and gas barrels, exhaust pipes, etc., a multi-channel temperature detection module is used to detect the temperatures of the multiple air compressor components one by one to obtain a temperature detection signal; with respect to the exhaust pressure, oil injection pressure and paint bucket pressure of the multiple air compressor components in the air compressor, detection is performed to obtain a pressure detection signal.

[0078] S3: Compare the temperature detection signals of multiple air compressor components with the corresponding temperature threshold signals in real time to obtain a temperature comparison result; control the corresponding air compressor components to switch to an automatic temperature control state or a temperature protection state according to the temperature comparison result; compare the pressure detection signals of multiple air compressor components with the corresponding pressure threshold signals in real time to obtain a pressure comparison result; control the corresponding air compressor components to switch to an automatic pressure control state or a pressure protection state according to the pressure comparison result.

[0079] Specifically, based on the temperature comparison results between the temperature detection signal of each air compressor component and the temperature threshold signal, it is determined whether it is in the temperature automatic control state or the temperature protection state; based on the pressure comparison results between the pressure detection signal of each air compressor component and the pressure threshold signal, it is determined whether it is in the pressure automatic control state or the pressure protection state, so that the coal mine underground air compressor can realize the functions of automatic loading and automatic unloading based on the exhaust pressure size.

[0080] Specifically, the temperature automatic control state includes increasing the heat dissipation rate of the cooler when the temperature is high, the temperature protection state is a temperature abnormality prompt state, and the main controller module controls the air compressor to stop when it detects that a single temperature abnormality lasts for a period exceeding the temperature abnormality timeout period; the pressure automatic control state is an automatic loading and unloading state, the pressure protection state is a pressure abnormality prompt state, and the main controller module controls the air compressor to stop when it detects that a single pressure abnormality lasts for a period exceeding the pressure abnormality timeout period.

[0081] S4: According to the function expansion interface of the main controller module and the function expansion module, when the function expansion program instruction is obtained, the corresponding expansion function is displayed or executed.

[0082] In this embodiment, the user can develop a customized function program through the main controller module combined with the function expansion interface of the function expansion module to achieve the purpose of function expansion of the air compressor in the coal mine.

[0083] It should be understood that the serial numbers of the steps in the above embodiments do not imply a sequence of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0084] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0085] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the features thereof may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A control system for an air compressor in a coal mine, characterized in that: It comprises a main controller module (1), a multi-channel temperature detection module (2), a multi-channel pressure detection module and a function expansion module (3); The main controller module (1) is arranged on the air compressor, and the main controller module (1) is connected to a communication connection module for connecting to a remote user control terminal, so that the main controller module (1) controls the operation state of the air compressor based on a remote control instruction received from the remote user control terminal; the air compressor comprises a plurality of air compressor components, and each of the air compressor components is associated with a component device identifier; The multi-channel temperature detection module (2) is used to detect the temperatures of the plurality of air compressor components and output temperature detection signals to the main controller module (1); the multi-channel pressure detection module is used to detect the pressures of the plurality of air compressor components and output pressure detection signals to the main controller module (1); The main controller module (1) is provided with a temperature threshold signal and a pressure threshold signal in one-to-one correspondence based on the component device identification of each of the air compressor components, and controls the air compressor components to switch to a temperature automatic control state or a temperature protection state according to a temperature comparison result between a temperature detection signal of the air compressor component and a corresponding temperature threshold signal; and controls the air compressor components to switch to a pressure automatic control state or a pressure protection state according to a pressure comparison result between a pressure detection signal of the air compressor component and a corresponding pressure threshold signal; The function expansion module is connected to the function expansion end of the main controller module (1); the temperature detection signal of the motor winding of the air compressor assembly includes an A-phase winding temperature detection signal, a B-phase winding temperature detection signal and a C-phase winding temperature detection signal; the temperature threshold signal of the motor winding also includes a phase difference threshold signal and a phase maximum threshold signal; The main controller module (1) calculates and obtains the phase temperature difference between the A-phase winding temperature detection signal, the B-phase winding temperature detection signal and the C-phase winding temperature detection signal to obtain a phase temperature difference signal, compares the phase temperature difference signal with the phase difference threshold signal, and outputs a motor winding abnormality prompt signal to the remote user control terminal when the phase temperature difference signal is greater than the phase difference threshold signal; The main controller module (1) compares the A-phase winding temperature detection signal, the B-phase winding temperature detection signal and the C-phase winding temperature detection signal with the phase-split maximum threshold signal one by one to obtain corresponding winding temperature comparison results; When the winding temperature comparison result meets the preset winding temperature early warning condition, the winding temperature abnormality prompt information is output.

2. A control system for an air compressor in a coal mine according to claim 1, characterized in that: The air compressor assembly includes a cooler, the multi-channel temperature detection module (2) includes an ambient temperature sensor for detecting ambient temperature, and the control system further includes: When the split-phase temperature difference signal is greater than the split-phase difference threshold signal, or when the winding temperature comparison result meets a preset winding temperature early warning condition; The main controller module (1) sends command detection signals to the motor winding, the ambient temperature sensor and the cooler respectively, and receives data detection signals fed back by the command detection signals to generate data detection results; The main controller module (1) determines whether fault abnormal temperature data exists based on the data detection result, generates fault type information if fault abnormal temperature data exists, and sends the fault type information to the remote user control terminal.

3. The control system of an underground air compressor in a coal mine according to claim 1, characterized in that: The temperature detection signal of the multi-channel temperature detection module (2) includes an ambient temperature detection signal; The main controller module (1) compares a preset reference threshold signal with a real-time detected ambient temperature detection signal to obtain a temperature threshold difference; The temperature threshold difference is compared with a preset first critical difference and a preset second critical difference, When the temperature threshold difference is greater than or equal to the preset first critical difference and less than the preset second critical difference, adjusting the temperature threshold signal by increasing or decreasing it based on the first temperature adjustment ratio; When the temperature threshold difference is greater than the second critical difference, adjusting the temperature threshold signal by increasing or decreasing it based on a second temperature adjustment ratio; When the temperature threshold signal is adjusted to be enlarged or reduced, a temperature threshold signal prompt instruction is generated and output to the remote user control terminal.

4. The control system of an underground air compressor in a coal mine according to claim 1, characterized in that: The air compressor assembly comprises a control transformer (5), a high-voltage fuse, and a low-voltage fuse, wherein the high-voltage fuse is connected to the high-voltage secondary side of the control transformer (5), and the low-voltage fuse is connected to the low-voltage secondary side of the control transformer (5); The air compressor assembly further comprises an exhaust pipe, and the pressure detection signal comprises an exhaust pressure detection signal of the exhaust pipe; The main controller module (1) is provided with an exhaust low pressure threshold signal and an exhaust high pressure threshold signal based on the exhaust pressure detection signal; when the main controller module (1) detects that the exhaust pressure detection signal of the exhaust pipeline is less than the exhaust low pressure threshold signal, the main controller module (1) controls the air compressor to switch to a loading state within a loading control time to increase the output of compressed air; when the main controller module (1) detects that the exhaust pressure detection signal of the exhaust pipeline is greater than the exhaust high pressure threshold signal, the main controller module (1) controls the air compressor to switch to an unloading state within an unloading control time to reduce the output of compressed air.

5. The control system of an underground air compressor in a coal mine according to claim 2, characterized in that: The air compressor is connected to a magnetic starter for providing power supply to the air compressor, and the magnetic starter controls the start and stop of the air compressor based on the start and stop control signal received from the main controller module (1). The control system also includes: The magnetic starter sends an operation detection signal to the air compressor in real time to detect whether the air compressor has received a start instruction; if no operation feedback signal is received within a preset time, a secondary operation detection signal is sent to the main controller module (1), the ambient temperature sensor, and the communication connection module to generate an operation detection result; If only the ambient temperature detection signal and the communication signal are obtained in the operation detection result, the magnetic starter sends an analog operational amplifier signal to the processor of the main controller module (1).

6. A control system for an air compressor in an underground coal mine according to claim 5, characterized in that: The air compressor assembly includes a backup power supply; if only an ambient temperature detection signal and a communication signal are obtained in the operation detection result, the magnetic starter sends an analog operational amplifier signal to the processor of the main controller module (1), and further includes: Based on the analog operational amplifier signal, if a startup instruction of the processor of the main controller module (1) is received and the air compressor is not started, a power supply test instruction is sent to the backup power supply; Based on the power supply test instruction, if the test instruction feedback signal is not received, air compressor fault information is generated as fault type information.

7. A method for controlling an air compressor in an underground coal mine, characterized in that: A control system for an underground air compressor in a coal mine as claimed in any one of claims 1 to 6, wherein the control method comprises: Collecting remote control instructions from a remote user control terminal, controlling the operating state of the air compressor based on the received remote control instructions, and controlling the start and stop of the air compressor; Detecting the temperatures of the plurality of air compressor components to obtain temperature detection signals; detecting the pressures of the plurality of air compressor components to obtain pressure detection signals; associating a component device identifier with each of the air compressor components, and associating a temperature threshold signal with a pressure threshold signal based on the component device identifier of each of the air compressor components; Compare the temperature detection signals of the plurality of air compressor components with the corresponding temperature threshold signals in real time to obtain a temperature comparison result; control the corresponding air compressor components to switch to a temperature automatic control state or a temperature protection state according to the temperature comparison result; compare the pressure detection signals of the plurality of air compressor components with the corresponding pressure threshold signals in real time to obtain a pressure comparison result; control the corresponding air compressor components to switch to a pressure automatic control state or a pressure protection state according to the pressure comparison result; According to the function expansion interface of the main controller module and the function expansion module, when the function expansion program instruction is obtained, the corresponding expansion function is displayed or executed; The temperature detection signal of the motor winding of the air compressor assembly includes a temperature detection signal of the A-phase winding, a temperature detection signal of the B-phase winding and a temperature detection signal of the C-phase winding; the temperature threshold signal of the motor winding also includes a phase difference threshold signal and a phase maximum threshold signal; The main controller module calculates and obtains the phase temperature difference between the A-phase winding temperature detection signal, the B-phase winding temperature detection signal and the C-phase winding temperature detection signal to obtain a phase temperature difference signal, compares the phase temperature difference signal with the phase difference threshold signal, and outputs a motor winding abnormality prompt signal to the remote user control terminal when the phase temperature difference signal is greater than the phase difference threshold signal; The main controller module compares the A-phase winding temperature detection signal, the B-phase winding temperature detection signal and the C-phase winding temperature detection signal with the phase-split maximum threshold signal one by one to obtain corresponding winding temperature comparison results; when the winding temperature comparison result meets the preset winding temperature warning condition, it outputs winding temperature abnormality prompt information.

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