Switch safety evaluation system and method for coal mine explosion-proof equipment by relative wear method

Abstract

The invention provides a safety evaluation system and a safety evaluation method for a switch for coal mine explosion-proof equipment through a relative wear method, and relates to the technical field of safety evaluation for the switch for the coal mine explosion-proof equipment based on a pre-provided safety evaluation system for the switch for the coal mine explosion-proof equipment through the relative wear method. The method comprises the following steps: calculating a threshold range of an expected stroke, a threshold range of expected vibration and a first threshold and a second threshold of expected abrasion loss of a switch contact for coal mine explosion-proof equipment in advance, judging whether vibration data is within the threshold range of the expected vibration, and judging whether stroke data is within the threshold range of the expected stroke; and judging the actual abrasion loss MS of the switch contact for the coal mine explosion-proof equipment, the first threshold value and the second threshold value, and judging whether the switch for the coal mine explosion-proof equipment breaks down or not, so that the safety of the switch for the coal mine explosion-proof equipment is improved, and the safety of the coal mine explosion-proof equipment is improved. A new thought is provided for state evaluation of the coal mine explosion-proof equipment in the operation process, and sustainable and healthy development of the coal mine explosion-proof equipment field is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of safety assessment for switches used in coal mine explosion-proof equipment, specifically to a safety assessment system and method for switches used in coal mine explosion-proof equipment based on the relative wear method. Background Art

[0002] Switches used in coal mine explosion-proof equipment include components such as vacuum contactors, vacuum circuit breakers, and disconnect switches. They play a role in connecting and disconnecting branch equipment in coal mine explosion-proof equipment and can instantaneously cut off the faulty branch in case of a fault to perform a protection function. Currently, switches used in coal mine explosion-proof equipment mainly adopt regular maintenance and fault repair, which to a certain extent ensures their safe operation. With the continuous progress of intelligent mine technology in China, the types and quantities of underground electrical equipment in coal mines are increasing continuously. Especially with the development of underground intelligent and unmanned technologies, higher and higher requirements are put forward for the safety of underground power supply systems and switch equipment. The operating state of the switch is directly related to whether the safe production work in coal mine underground can be carried out smoothly. The existing safety guarantee technologies for switches used in coal mine explosion-proof equipment can no longer meet the rapid development needs of coal mines. Therefore, it is of great significance to carry out research on the safety assessment technology for switches used in coal mine explosion-proof equipment. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the object of the present invention is to propose a safety assessment system for switches used in coal mine explosion-proof equipment based on the relative wear method, including a display unit, an instruction input unit, a power supply unit, a reset unit, a clock unit, a crystal oscillator unit, a DSP, a signal conversion unit, a switch used in coal mine explosion-proof equipment, a current detection unit, a signal acquisition unit, a stroke detection unit, a voltage detection unit, a vibration detection unit, a CAN communication unit, an industrial computer, and a data storage unit;

[0004] Among them, the signal input end of the display unit is connected to the display signal output end of the DSP, and the signal output end of the instruction input unit is connected to the control signal input end of the DSP;

[0005] The signal output end of the power supply unit is connected to the power connection terminal of the DSP, the signal output end of the reset unit is connected to the reset signal connection terminal of the DSP, the signal output end of the clock unit is connected to the clock signal input terminal of the DSP, and the signal output end of the crystal oscillator unit is connected to the crystal oscillator signal input terminal of the DSP;

[0006] The control signal output end of the DSP is connected to the signal input end of the signal conversion unit, and the signal output end of the signal conversion unit is connected to the control signal input end of the switch used in coal mine explosion-proof equipment;

[0007] The main circuit terminal of the switch for coal mine explosion-proof equipment is connected to one end of a wire, and the other end of the wire passes through the test terminal of the current detection unit. The signal test terminal of the voltage detection unit is connected in parallel with the input end and the output end of the main circuit of the switch for coal mine explosion-proof equipment; the signal test terminal of the vibration detection unit is connected to the moving contact rod of the switch for coal mine explosion-proof equipment. The vibration detection unit includes a vibration sensor, a sensor fixing device and a power supply device; the signal test terminal of the stroke detection unit is connected to the stroke signal test part of the switch for coal mine explosion-proof equipment. The stroke detection unit includes a stroke sensor, a sensor fixing device and a power supply device;

[0008] The signal output terminal of the current detection unit is connected to the signal input terminal of the signal acquisition unit, the signal output terminal of the voltage detection unit is connected to the signal input terminal of the signal acquisition unit, the signal output terminal of the stroke detection unit is connected to the signal input terminal of the signal acquisition unit, and the signal output terminal of the vibration detection unit is connected to the signal input terminal of the signal acquisition unit;

[0009] The signal output terminal of the signal acquisition unit is connected to the voltage signal input terminal, the current signal input terminal, the stroke signal input terminal and the vibration signal input terminal of the DSP;

[0010] The communication signal terminal of the industrial computer is connected to the communication signal terminal of the DSP through the CAN communication unit, and the signal input terminal of the data storage unit is connected to the storage signal output terminal of the DSP.

[0011] The safety assessment method for the switch for coal mine explosion-proof equipment based on the relative wear method is realized based on the safety assessment system for the switch for coal mine explosion-proof equipment based on the relative wear method, and includes:

[0012] Step 1: Calculate the expected wear amount M of the switch contacts for coal mine explosion-proof equipment Z 、the expected stroke L of the switch for coal mine explosion-proof equipment and the expected vibration A of the switch for coal mine explosion-proof equipment. Then, according to the expected wear amount of the switch contacts for coal mine explosion-proof equipment, determine the first threshold and the second threshold of the expected wear amount of the switch contacts for coal mine explosion-proof equipment. According to the expected stroke L of the switch for coal mine explosion-proof equipment, determine the threshold range of the expected stroke. According to the expected vibration A of the switch for coal mine explosion-proof equipment, determine the threshold range of the expected vibration;

[0013] Step 2: The switch for coal mine explosion-proof equipment sends the current signal to the current detection unit, sends the vibration signal to the vibration detection unit, and sends the stroke signal to the stroke detection unit. Then, the current detection unit sends the current signal to the signal acquisition unit, the vibration detection unit sends the vibration signal to the signal acquisition unit, and the stroke detection unit sends the stroke signal to the signal acquisition unit. Then, the signal acquisition unit sends the current signal, the vibration signal and the stroke signal to the DSP;

[0014] Step 3: Calculate the current data based on the current signal, calculate the vibration data based on the vibration signal, calculate the stroke data based on the stroke signal, determine whether the vibration data is within the threshold range of the expected vibration. When the vibration data is not within the threshold range of the expected vibration, output a first warning message, where the first warning message is used to prompt that the switch for coal mine explosion-proof equipment has a fault and needs to be shut down for maintenance; determine whether the stroke data is within the threshold range of the expected stroke. When the stroke data is not within the threshold range of the expected stroke, output the first warning message; when the stroke data is within the threshold range of the expected stroke and the vibration data is also within the threshold range of the expected vibration, execute Step 4;

[0015] Step 4: Determine the number of breaking times T of the switch for coal mine explosion-proof equipment according to the current data or the stroke data, and determine the actual breaking current I of the switch for coal mine explosion-proof equipment according to the current signal S , and then according to the number of breaking times T of the switch for coal mine explosion-proof equipment and the actual breaking current I of the switch for coal mine explosion-proof equipment S , calculate the actual wear amount M of the contacts of the switch for coal mine explosion-proof equipment S , which is specifically expressed by the following formula:

[0016]

[0017] When the actual wear amount M of the contacts of the switch for coal mine explosion-proof equipment S is greater than the first threshold, output a second warning message, where the second warning message is used to prompt that the switch for coal mine explosion-proof equipment is about to have a fault and needs to be shut down for maintenance. When the actual wear amount M of the contacts of the switch for coal mine explosion-proof equipment S is greater than the second threshold, output an alarm message, where the alarm message is used to prompt that the switch for coal mine explosion-proof equipment has a fault and needs to be shut down for maintenance.

[0018] Optionally, Step 1 specifically includes:

[0019] Obtain the electrical life times N of the switch for coal mine explosion-proof equipment and the electrical life test current I of the switch for coal mine explosion-proof equipment e , and then calculate the expected wear amount M of the contacts of the switch for coal mine explosion-proof equipment through the electrical life times N of the switch for coal mine explosion-proof equipment and the electrical life test current I of the switch for coal mine explosion-proof equipment e , which is specifically realized by the following formula: Z Based on this, the first threshold is 0.8 times of M

[0020]

[0021] Based on this, the first threshold is 0.8 times of M Z and the second threshold is 0.9 times of M Z ;

[0022] Before the switch for coal mine explosion-proof equipment is put into operation, the switch for coal mine explosion-proof equipment is tested 10 times to obtain 10 sets of actual test vibration data of the switch for coal mine explosion-proof equipment and 10 sets of actual test stroke data of the switch for coal mine explosion-proof equipment. The 10 sets of actual test stroke data of the switch for coal mine explosion-proof equipment include: L1, L2, L3, L4, L5, L6, L7, L8, L9 and L 10 ; The 10 sets of actual test vibration data of the switch for coal mine explosion-proof equipment include: A1, A2, A3, A4, A5, A6, A7, A8, A9 and A 10 ; Based on the 10 sets of actual test stroke data of the switch for coal mine explosion-proof equipment, the expected stroke L of the switch for coal mine explosion-proof equipment is calculated, specifically calculated by the following formula:

[0023]

[0024] Based on this, the threshold range of the expected stroke is 0.85L~1.1L;

[0025] Based on the 10 sets of actual test vibration data of the switch for coal mine explosion-proof equipment, the expected vibration A of the switch for coal mine explosion-proof equipment is calculated, specifically calculated by the following formula:

[0026]

[0027] Based on this, the threshold range of the expected vibration is 0.85A~1.1A.

[0028] The beneficial effects produced by adopting the above technical solutions are as follows:

[0029] The present invention provides a safety evaluation system and method for switches for coal mine explosion-proof equipment using the relative wear method, pre-calculates the threshold range of the expected stroke, the threshold range of the expected vibration, and the first and second thresholds of the expected wear amount of the contacts of the switches for coal mine explosion-proof equipment, and judges whether the vibration data is within the threshold range of the expected vibration, and at the same time judges whether the stroke data is within the threshold range of the expected stroke. Furthermore, when the stroke data is within the threshold range of the expected stroke and the vibration data is also within the threshold range of the expected vibration, judge the actual wear amount M of the contacts of the switches for coal mine explosion-proof equipment S Compare with the first and second thresholds to judge whether the switch for coal mine explosion-proof equipment fails, improve the safety of the switch for coal mine explosion-proof equipment. Thus, the safety of coal mine explosion-proof equipment is improved, providing new ideas for the state evaluation of the operation process of coal mine explosion-proof equipment, and promoting the sustainable and healthy development of the field of coal mine explosion-proof equipment. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of a safety evaluation system for switches for coal mine explosion-proof equipment using the relative wear method in an embodiment of the present invention;

[0031] Figure 2 This is the curve diagram of the breaking current and life of a switch for coal mine explosion-proof equipment in the embodiments of the present invention;

[0032] Figure 3 This is the schematic flow diagram of a safety assessment method for a switch for coal mine explosion-proof equipment using the relative wear method in the embodiments of the present invention. Specific embodiments

[0033] The following will further describe in detail the specific embodiments of the present invention with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0034] In view of the problems existing in the prior art, the present invention provides a safety assessment system for a switch for coal mine explosion-proof equipment using the relative wear method, combined with Figure 1 , including a display unit, an instruction input unit, a power supply unit, a reset unit, a clock unit, a crystal oscillator unit, a DSP, a signal conversion unit, a switch for coal mine explosion-proof equipment, a current detection unit, a signal acquisition unit, a stroke detection unit, a voltage detection unit, a vibration detection unit, a CAN communication unit, an industrial computer, and a data storage unit;

[0035] Among them, the signal input end of the display unit is connected to the display signal output end of the DSP, and the signal output end of the instruction input unit is connected to the control signal input end of the DSP;

[0036] The signal output end of the power supply unit is connected to the power supply terminal of the DSP, the signal output end of the reset unit is connected to the reset signal terminal of the DSP, the signal output end of the clock unit is connected to the clock signal input terminal of the DSP, and the signal output end of the crystal oscillator unit is connected to the crystal oscillator signal input terminal of the DSP;

[0037] The control signal output end of the DSP is connected to the signal input end of the signal conversion unit, and the signal output end of the signal conversion unit is connected to the control signal input end of the switch for coal mine explosion-proof equipment;

[0038] The main circuit terminal of the switch for coal mine explosion-proof equipment is connected to one end of the wire. The other end of the wire passes through the test terminal of the current detection unit. The signal test terminals of the voltage detection unit are connected in parallel with the input end and the output end of the main circuit of the switch for coal mine explosion-proof equipment. The signal test terminal of the vibration detection unit is connected to the moving contact rod of the switch for coal mine explosion-proof equipment. The vibration detection unit includes a vibration sensor, a sensor fixing device and a power supply device. Among them, the model of the vibration sensor is SE870. The signal test terminal of the stroke detection unit is connected to the stroke signal test part of the switch for coal mine explosion-proof equipment. The stroke detection unit includes a stroke sensor, a sensor fixing device and a power supply device. The model of the stroke sensor is KHL-5300;

[0039] The signal output terminal of the current detection unit is connected to the signal input terminal of the signal acquisition unit. The signal output terminal of the voltage detection unit is connected to the signal input terminal of the signal acquisition unit. The signal output terminal of the stroke detection unit is connected to the signal input terminal of the signal acquisition unit. The signal output terminal of the vibration detection unit is connected to the signal input terminal of the signal acquisition unit;

[0040] The signal output terminal of the signal acquisition unit is connected to the voltage signal input terminal, the current signal input terminal, the stroke signal input terminal and the vibration signal input terminal of the DSP;

[0041] The communication signal terminal of the industrial computer is connected to the communication signal terminal of the DSP through the CAN communication unit. The signal input terminal of the data storage unit is connected to the storage signal output terminal of the DSP.

[0042] Based on the relative wear method for the safety assessment system of the switch for coal mine explosion-proof equipment, the present invention provides a safety assessment method for the switch for coal mine explosion-proof equipment using the relative wear method, which may include the following steps:

[0043] Step 1: Calculate the expected wear amount M of the contacts of the switch for coal mine explosion-proof equipment Z , the expected stroke L of the switch for coal mine explosion-proof equipment and the expected vibration A of the switch for coal mine explosion-proof equipment. Then, according to the expected wear amount of the contacts of the switch for coal mine explosion-proof equipment, determine the first threshold and the second threshold of the expected wear amount of the contacts of the switch for coal mine explosion-proof equipment. According to the expected stroke L of the switch for coal mine explosion-proof equipment, determine the threshold range of the expected stroke. According to the expected vibration A of the switch for coal mine explosion-proof equipment, determine the threshold range of the expected vibration;

[0044] Combined with Figure 2It can be seen that the relative wear method for the safety assessment of switches for coal mine explosion-proof equipment adopts the relationship that the contact wear amount is inversely proportional to the safety. Each current breaking will cause wear to the contacts, and the stroke and vibration signals during the opening and closing processes of the switches for coal mine explosion-proof equipment are comprehensively combined. The expected wear amount of the contacts of the switches for coal mine explosion-proof equipment is characterized by the number of electrical life cycles and the heat generated by the rated current, and the calculation method is as follows:

[0045] Obtain the number of electrical life cycles N of the switch for coal mine explosion-proof equipment and the electrical life test current I of the switch for coal mine explosion-proof equipment e , and then through the number of electrical life cycles N of the switch for coal mine explosion-proof equipment and the electrical life test current I of the switch for coal mine explosion-proof equipment e Calculate the expected wear amount M of the contacts of the switch for coal mine explosion-proof equipment Z , which is specifically realized through the following formula:

[0046]

[0047] Based on this, the first threshold is 0.8 times of M Z , and the second threshold is 0.9 times of M Z ;

[0048] Before the switch for coal mine explosion-proof equipment is put into operation, conduct 10 tests on the switch for coal mine explosion-proof equipment to obtain 10 actual test vibration data of the switch for coal mine explosion-proof equipment and 10 actual test stroke data of the switch for coal mine explosion-proof equipment. The 10 actual test stroke data of the switch for coal mine explosion-proof equipment include: L1, L2, L3, L4, L5, L6, L7, L8, L9 and L 10 , and the 10 actual test vibration data of the switch for coal mine explosion-proof equipment include: A1, A2, A3, A4, A5, A6, A7, A8, A9 and A 10 ; Based on the 10 actual test stroke data of the switch for coal mine explosion-proof equipment, calculate the expected stroke L of the switch for coal mine explosion-proof equipment, which is specifically calculated through the following formula:

[0049]

[0050] Based on this, the threshold range of the expected stroke is 0.85L to 1.1L;

[0051] Based on the 10 actual test vibration data of the switch for coal mine explosion-proof equipment, calculate the expected vibration A of the switch for coal mine explosion-proof equipment, which is specifically calculated through the following formula:

[0052]

[0053] Based on this, the threshold range of the expected vibration is 0.85A to 1.1A.

[0054] It should be noted that due to factors such as the cumulative tolerance during the operation of the switch for coal mine explosion-proof equipment, the test accuracy of the stroke detection unit and the vibration detection unit, there will be some deviations in the two parameters of stroke and vibration. Therefore, the expected vibration and expected stroke are set as range values.

[0055] Step 2: After the system is initialized and running, in combination with Figure 3 , the switch for coal mine explosion-proof equipment sends the current signal to the current detection unit, sends the vibration signal to the vibration detection unit, and sends the stroke signal to the stroke detection unit. Then, the current detection unit sends the current signal to the signal acquisition unit, the vibration detection unit sends the vibration signal to the signal acquisition unit, and the stroke detection unit sends the stroke signal to the signal acquisition unit. Subsequently, the signal acquisition unit sends the current signal, vibration signal, and stroke signal to the DSP.

[0056] Step 3: Calculate the current data according to the current signal, calculate the vibration data according to the vibration signal, and calculate the stroke data according to the stroke signal in the DSP. Determine whether the vibration data is within the threshold range of the expected vibration, that is, Figure 3 judge whether it exceeds the vibration safety range in Figure 3 . When the vibration data is not within the threshold range of the expected vibration, output the first warning message, and the first warning message is used to prompt that the switch for coal mine explosion-proof equipment has a fault and needs to be shut down for maintenance; judge whether the stroke data is within the threshold range of the expected stroke, that is,

[0057] judge whether it exceeds the stroke safety range in S . When the stroke data is not within the threshold range of the expected stroke, output the first warning message; when the stroke data is within the threshold range of the expected stroke and the vibration data is also within the threshold range of the expected vibration, execute Step 4; S calculate the actual wear amount M of the switch contacts for coal mine explosion-proof equipment according to the number of breaking times T of the switch for coal mine explosion-proof equipment and the actual breaking current I of the switch for coal mine explosion-proof equipment S , that is, Figure 3 calculate the cumulative wear characteristic amount in

[0058]

[0059] Specifically, it is represented by the following formula: S When the actual wear amount M of the switch contacts for coal mine explosion-proof equipment SWhen it is greater than the second threshold, an alarm message is output. The alarm message is used to prompt that the switch for coal mine explosion-proof equipment has a fault and needs to be shut down for maintenance. That is, when the actual wear amount M of the switch contact for coal mine explosion-proof equipment S is greater than 0.8 times of M Z a second warning message is output. When the actual wear amount M of the switch contact for coal mine explosion-proof equipment S is greater than 0.9 times of M Z an alarm message is output. Otherwise, return to execute the acquisition of current signal, vibration signal and stroke signal. This part is equivalent to Figure 3 judging whether it exceeds the safety amount of wear characteristic value in S that is, judging whether the actual wear amount M of the switch contact for coal mine explosion-proof equipment exceeds the first threshold and the second threshold.

[0060] The above description is only the preferred embodiment of the present disclosure and the explanation of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the embodiments of the present disclosure that have similar functions.

Claims

1. Relative wear method switch safety assessment system for coal mine explosion-proof equipment, characterized in that: Including display unit, command input unit, power supply unit, reset unit, clock unit, crystal oscillator unit, DSP, signal conversion unit, switch for coal mine explosion-proof equipment, current detection unit, signal acquisition unit, travel detection unit, voltage detection unit, vibration detection unit, CAN communication unit, industrial computer and data storage unit; Wherein, the signal input end of the display unit is connected to the display signal output end of the DSP, and the signal output end of the instruction input unit is connected to the control signal input end of the DSP; The signal output end of the power supply unit is connected to the power supply terminal of the DSP, the signal output end of the reset unit is connected to the reset signal terminal of the DSP, the signal output end of the clock unit is connected to the clock signal input terminal of the DSP, and the signal output end of the crystal oscillator unit is connected to the crystal oscillator signal input terminal of the DSP; The control signal output end of the DSP is connected to the signal input end of the signal conversion unit, and the signal output end of the signal conversion unit is connected to the control signal input end of the switch for coal mine explosion-proof equipment; The main circuit wiring terminal of the switch for coal mine explosion-proof equipment is connected to one end of the wire, and the other end of the wire passes through the test end of the current detection unit. The signal test end of the voltage detection unit is connected in parallel with the input end and the output end of the main circuit of the switch for coal mine explosion-proof equipment; the signal test end of the vibration detection unit is connected to the moving guide rod of the switch for coal mine explosion-proof equipment, and the vibration detection unit includes a vibration sensor, a sensor fixing device and a power supply device; the signal test end of the stroke detection unit is connected to the stroke signal test part of the switch for coal mine explosion-proof equipment, and the stroke detection unit includes a stroke sensor, a sensor fixing device and a power supply device; The signal output end of the current detection unit is connected to the signal input end of the signal acquisition unit, the signal output end of the voltage detection unit is connected to the signal input end of the signal acquisition unit, the signal output end of the travel detection unit is connected to the signal input end of the signal acquisition unit, and the signal output end of the vibration detection unit is connected to the signal input end of the signal acquisition unit; The signal output terminal of the signal acquisition unit is connected to the voltage signal input terminal, the current signal input terminal, the travel signal input terminal, and the vibration signal input terminal of the DSP; The communication signal end of the industrial computer is connected to the communication signal end of the DSP via the CAN communication unit, and the signal input end of the data storage unit is connected to the storage signal output end of the DSP.

2. A relative wear method for safety assessment of switches for coal mine explosion-proof equipment, which is implemented based on the relative wear method for safety assessment of switches for coal mine explosion-proof equipment of claim 1, and is characterized in that: include: Step 1: Calculate the expected wear M of the switch contacts for coal mine explosion-proof equipment Z , an expected stroke L of the switch for coal mine explosion-proof equipment and an expected vibration A of the switch for coal mine explosion-proof equipment, and then according to the expected wear amount of the switch contact for coal mine explosion-proof equipment, determine a first threshold value and a second threshold value of the expected wear amount of the switch contact for coal mine explosion-proof equipment, determine a threshold range of the expected stroke according to the expected stroke L of the switch for coal mine explosion-proof equipment, and determine a threshold range of the expected vibration according to the expected vibration A of the switch for coal mine explosion-proof equipment; Step 2: The switch of the coal mine explosion-proof equipment sends the current signal to the current detection unit, sends the vibration signal to the vibration detection unit, sends the stroke signal to the stroke detection unit, and then the current detection unit sends the current signal to the signal acquisition unit, the vibration detection unit sends the vibration signal to the signal acquisition unit, the stroke detection unit sends the stroke signal to the signal acquisition unit, and then the signal acquisition unit sends the current signal, the vibration signal and the stroke signal to the DSP; Step 3: in DSP, current data is calculated according to the current signal, vibration data is calculated according to the vibration signal, and travel data is calculated according to the travel signal, and it is determined whether the vibration data is within the threshold range of the expected vibration. When the vibration data is not within the threshold range of the expected vibration, a first warning message is output, and the first warning message is used to prompt that a switch for coal mine explosion-proof equipment has a fault and needs to be shut down for maintenance; it is determined whether the travel data is within the threshold range of the expected travel. When the travel data is not within the threshold range of the expected travel, a first warning message is output; when the travel data is within the threshold range of the expected travel and the vibration data is also within the threshold range of the expected vibration, step 4 is executed; Step 4: Determine the breaking times T of the switch for coal mine explosion-proof equipment according to the current data or travel data, and determine the actual breaking current I of the switch for coal mine explosion-proof equipment according to the current signal S , and then according to the breaking times T of the switch for coal mine explosion-proof equipment and the actual breaking current I of the switch for coal mine explosion-proof equipment S , calculate the actual wear amount M of the switch contact for coal mine explosion-proof equipment S , which is specifically expressed by the following formula: When the actual wear amount of the switch contact for coal mine explosion-proof equipment is M S When the actual wear amount M of the switch contact of the coal mine explosion-proof equipment is greater than the first threshold, the second warning information is output, and the second warning information is used to prompt that the switch for coal mine explosion-proof equipment is about to fail and needs to be shut down for maintenance. S When it is greater than the second threshold, an alarm message is output, wherein the alarm message is used to prompt that a switch for coal mine explosion-proof equipment fails and needs to be shut down for maintenance.

3. The relative wear method for safety assessment of switches for coal mine explosion-proof equipment according to claim 2 is characterized in that: Step 1 specifically includes: Obtain the number of times N of the electrical life of the switch for coal mine explosion-proof equipment and the electrical life test current I of the switch for coal mine explosion-proof equipment e , and then through the coal mine explosion-proof equipment switch electrical life times N and coal mine explosion-proof equipment switch electrical life test current I e Calculation of expected wear M of switch contacts for coal mine explosion-proof equipment Z , which is specifically achieved through the following formula: Based on this, the first threshold is 0.8 times M Z , the second threshold is 0.9 times M Z ; Before the switch for coal mine explosion-proof equipment is put into operation, 10 tests are carried out on the switch for coal mine explosion-proof equipment to obtain 10 actual test vibration data of the switch for coal mine explosion-proof equipment and 10 actual test stroke data of the switch for coal mine explosion-proof equipment. The 10 actual test stroke data of the switch for coal mine explosion-proof equipment include: L1, L2, L3, L4, L5, L6, L7, L8, L9 and L 10 , the actual test vibration data of 10 switches for coal mine explosion-proof equipment include: A1, A2, A3, A4, A5, A6, A7, A8, A9 and A 10 Based on the actual test stroke data of 10 switches for coal mine explosion-proof equipment, the expected stroke L of the switch for coal mine explosion-proof equipment is calculated, which is specifically calculated by the following formula: Based on this, the threshold range of expected range is 0.85L to 1.1L; Based on the actual test vibration data of 10 switches for coal mine explosion-proof equipment, the expected vibration A of the switches for coal mine explosion-proof equipment is calculated, which is specifically calculated by the following formula: Based on this, the expected vibration threshold range is 0.85A ~ 1.1A.

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