CN117170218A - Stage mechanical switching control safety detection device and use method - Google Patents
Stage mechanical switching control safety detection device and use method Download PDFInfo
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Abstract
The invention belongs to the field of stage mechanical control, and discloses a stage mechanical switching control safety detection device and a use method thereof, wherein the device comprises a matrix switching circuit, a routing inspection judging circuit and a PLC (programmable logic controller) which participates in judgment and redundancy switching, and the matrix switching circuit is electrically connected with the routing inspection judging circuit; the inspection judging circuit comprises a plurality of frequency converters, a matrix switching gating and an inspection circuit, wherein the frequency converters are electrically connected and controlled by a PLC (programmable logic controller) through a communication network, the matrix switching gating and the inspection circuit are electrically connected, the PLC, the frequency converters and the matrix switching gating form a loop, and the switching failure of the matrix switching circuit and the failure diagnosis of the inspection judging circuit component are completed through the PLC; the PLC detects the state of the matrix switching circuit through the equipment signal power supply and the forced superposition signal which are electrically connected through the inspection scanning control, judges the fault state according to the state detection, adjusts the sequencing of the frequency converters, and carries out matrix switching and inspection judgment again. And safety detection and multiple redundancy automatic switching are realized.
Description
Technical Field
The invention belongs to the field of stage mechanical control, and particularly relates to a stage mechanical switching control safety detection device and a use method thereof.
Background
The system has a great amount of stage mechanical switching control application requirements in the field of stage mechanical control systems, and has high redundancy and very high application trend due to low matrix switching control cost. The method is mainly used for small theatres with low safety requirements and infrequent performances. The current stage mechanical matrix switching control adopts an open loop type switching control, specifically 1, a relay and a contactor switching control, and a PLC full matrix point output gating (or decoding circuit) mode. 2. And the switching control of the logic chip, the relay and the contactor is realized, and the PLC is in a full-output matrix point output gating (or decoding circuit) mode. 3. A singlechip (or FPGA) chip, a relay and a contactor, and a PLC full-output matrix point output gating (or decoding circuit) mode. The switching result is not detected in the above manner. Because the number of the stage mechanical matrix switching control wires is large, the number of the elements is large, partial potential safety hazards are formed by the wires or element faults, and the potential hazards of miscut and serial cutting cannot be found in time, so that the matrix switching circuit faults lack automatic redundancy switching functions, and the system reliability is affected. The redundancy needs to be carried out manually, the redundancy efficiency is low, the safety is affected due to lack of effective detection, the redundancy is only carried out on the frequency converter, the redundancy is not realized in the matrix switching loop, and the reliability and the wide-range use of the matrix switching are affected.
Because of the false cutting caused by loose components and wiring, the serial cutting has no reliable guarantee measure, and a conventional detection mode is adopted, so that a great deal of cost increase is caused. Reasons for possible handover failure include: the PLC switches over the output point trouble, contactor relay contact adhesion, the wiring is not hard up, strobe ineffectiveness, strobe series connection etc. these faults may cause equipment protection signal to lose efficacy, equipment moves such as abnormal potential safety hazards, very need to take technical means, avoid the emergence of these faults. Therefore, a low-cost detection device is needed to complete the high coverage fault diagnosis function, and when a switching fault occurs, various possible faults can be detected in time so as to improve the safety of the switching circuit.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and aims to solve the problems, and the invention provides a stage mechanical switching control safety detection device and a use method thereof, which are suitable for middle and small-sized performance theatres. The method solves the problem of effective detection of the switching circuit, the fault detection covers all predictable faults of the matrix switching circuit, the switching circuit and the routing inspection circuit are taken as two components to finish the switching process together, and any fault of the two components can be judged; and the operation is allowed according to the judgment result, so that the safety requirement of the switching circuit is ensured. When judging that the switching is wrong, the switching control selection is automatically adjusted according to the requirement, and under the condition that the fault cannot be eliminated, the equipment is forbidden to run, so that the reliability of the system is improved. The method solves the problems of safety detection and automatic redundancy switching of matrix switching to improve reliability, has simple control and low cost, and realizes the safety detection and the automatic redundancy switching of multiple.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a stage mechanical switching control safety detection device which comprises a matrix switching circuit, a patrol judging circuit and a PLC controller participating in judgment and redundancy switching, wherein the matrix switching circuit is electrically connected with the patrol judging circuit; the inspection judging circuit comprises a plurality of frequency converters electrically connected through a frequency converter communication network by a PLC controller, and a matrix switching gating and inspection circuit electrically connected by the PLC controller, wherein the PLC controller, the frequency converters and the matrix switching gating form a loop, the switching failure of the matrix switching circuit and the fault diagnosis of the inspection judging circuit are completed through the PLC controller, and the matrix switching circuit connects a device motor and a signal gate associated with the motor to the corresponding frequency converter; the PLC controls the electrically connected equipment signal power supply and external forced superposition signals through inspection scanning, detects the state of the matrix switching circuit, and the electrically connected equipment signal power supply and external forced superposition signals are electrically connected with matrix switching gating.
The second aspect of the invention provides a method for using a stage mechanical switching control safety detection device, which comprises the steps of finishing fault diagnosis by switching a patrol circuit signal of a patrol judging circuit and a matrix of a matrix switching circuit, judging the patrol circuit signal of a power supply of a device to be patrol (comprising the power on and off states of the device to be patrol), changing the matrix switching method when the patrol detects the fault, and re-patrol the judging circuit;
when the switching of each gating device is finished, carrying out inspection on the signal states of all selected devices, and judging whether crosstalk exists on other switching devices by a PLC (programmable logic controller); when the signal voltage state is unchanged, the matrix switching gating or inspection circuit fails;
the replacement matrix switching method comprises the following steps: the inspection circuit is used for performing inspection control on two paths of inspected equipment power supplies, and inspecting the signal voltage change of the inspected equipment;
detecting the state change of the protection signal of the gating equipment by using a PLC controller to finish detecting the abnormal switching faults of the matrix of the equipment to be patrolled;
and (3) sending a forced superposition power supply instruction to the inspection circuit through the PLC for the no-voltage state signal of the inspected equipment, and detecting the signal voltage of the protection signal state of the motor of the gating equipment.
Compared with the prior art, the invention has the following beneficial effects:
the switching safety detection circuit is applied to stage mechanical switching control, is suitable for a stage mechanical matrix switching circuit consisting of a relay, a contactor switching circuit, an electronic circuit and a contactor, and is composed of inspection circuit hardware and a PLC controller together to complete matrix switching fault inspection and multiple redundancy automatic switching control. On the premise of little increase of the current switching control cost, the fault diagnosis of the predictable matrix switching circuit is completely covered, the fault diagnosis is completed before the equipment operates, and the switching control mode is adjusted according to the fault diagnosis result, so that the safety and reliability of the matrix switching control system are effectively improved, the application of stage mechanical switching control is expanded, and the performance is stable. The method solves the problem that the fault diagnosis of the matrix switching circuit is completely covered, and the matrix switching gating is automatically carried out again. During the switching process, automatically discovering a switching failure; after the switching failure is found, the system automatically readjusts the switching scheme, and under the condition that the failure cannot be eliminated, the equipment is forbidden to operate. When the inspection circuit finds a switching failure, the matrix gating switching is replaced, the gating path is changed, and redundancy switching control is realized. In the switching gating process of each device, one complete fault diagnosis is completed, and the diagnosis time is less than 1000ms. And (3) finishing safety inspection by cutting off the signal power supply of the equipment to detect the signal state change, and automatically replacing the redundant switching related hardware according to the detected matrix switching failure.
Drawings
Fig. 1 is a schematic diagram of basic units of a patrol circuit of the stage mechanical switching control safety detection device.
Fig. 2 is a flow chart of inspection of a protection signal of the stage mechanical switching control safety detection device.
Fig. 3 is a schematic diagram of a forced superposition switching signal circuit of the stage mechanical switching control safety detection device.
Fig. 4 is a flow chart of inspection of the stage mechanical switching control safety detection device of the present invention.
Fig. 5 is a matrix switching block diagram of the stage mechanical switching control safety detection device of the present invention.
Fig. 6 is a cancellation matrix switching block diagram of the stage mechanical switching control safety detection device of the present invention.
Fig. 7 is a diagram of a matrix switching circuit safety detection system of the stage mechanical switching control safety detection device according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The stage mechanical matrix switching control adopts a decoding circuit to drive and a PLC controller to finish switching inspection functions, and the switching equipment signal state is detected to finish switching fault detection by adjusting the power supply of the switching equipment, and the stage mechanical matrix switching control comprises a safety inspection circuit and related control of the PLC controller. The matrix switching principle is that addresses of equipment to be switched (such as a frequency converter) are coded into 1-n, addresses of equipment to be patrolled (motors and detection signals) are 1~m, and the equipment to be patrolled is connected to the equipment to be switched from small to large according to the corresponding communication of the address numbers from small to large. The redundancy procedure is when the switch fails: and (3) the number of all the switched devices is n, the address numbers of the frequency converters are 1-n, the address numbers of the frequency converters are-1, the address of the frequency converter with the number 1 is readjusted, the rearrangement is completed, and the equipment to be patrolled is again gated according to the newly arranged address of the frequency converter.
Example 1: as shown in fig. 7, the stage mechanical switching control safety detection device is used for switching a safety inspection circuit by a matrix, and comprises a matrix switching circuit, an inspection judging circuit and a PLC controller participating in judgment and redundancy switching, wherein the matrix switching circuit is electrically connected with the inspection judging circuit; the inspection judging circuit comprises a plurality of frequency converters electrically connected through a frequency converter communication network by a PLC controller, and a matrix switching gating and inspection circuit electrically connected by the PLC controller, wherein the PLC controller, the frequency converters and the matrix switching gating form a loop, the switching failure of the matrix switching circuit and the fault diagnosis of the inspection judging circuit are completed through the PLC controller, and the matrix switching circuit connects a device motor and a signal gate associated with the motor to the corresponding frequency converter; the PLC controls the electrically connected equipment signal power supply and external forced superposition signals through inspection scanning, detects the state of the matrix switching circuit, and the electrically connected equipment signal power supply and external forced superposition signals are electrically connected with matrix switching gating. Matrix switching is the course of action of the matrix switching circuit. And the PLC full-matrix point output gating (or decoding circuit) mode. And judging a fault state according to the state detection, adjusting the sequence of the frequency converters after the fault of the matrix switching circuit is found, and carrying out matrix switching and inspection judgment again to realize safety detection and multiple redundancy automatic switching.
Optionally, the matrix switching circuit runs a full matrix to complete the gating switching of a main loop and a protection signal of the equipment motor, and comprises a switching circuit and a contactor; the device comprises an encoder signal, a gating device protection signal (a rope loosening signal and a brake state action signal), a main circuit of a contactor operation device motor, brake control, limit maintenance, an upper limit, a lower limit and load signal gating switching. The switching circuit completes the switching of the motor signals of the equipment and comprises an electronic circuit or a relay.
Optionally, the frequency converter DI point collects the gating device protection signal after switching, and transmits the gating device protection signal to the PLC controller through the frequency converter communication network, or the gating device protection signal after switching collects the detection signal through the DI point of the PLC controller; the matrix switching device realizes the gating switching of the motor of the device through the output gating by the DO output point of the PLC. The DO output point of the PLC is a 6-bit PLC-DO output point, the maximum 63 device gating switching is realized, and the quantity of the PLC output points and the program decoding time are reduced by hardware decoding.
The switching signals of each equipment motor are as follows: 1. the motor main loop line, the motor brake control signal, the equipment upper limit, the equipment lower limit, the limit position, the motor wire rope disorder signal, the motor encoder signal and the motor temperature signal. The DI point of the PLC is the switching value input, DO is the switching value output, DI is the digital value (switching value) input signal, and is the on-off state of the electric secondary circuit and the feedback of certain states. The signal voltage is 24VDC or 220VAC. DO is a digital quantity (switching quantity) output signal. The control signal or status signal from the controller is at 24VDC or 220VAC.
Optionally, as shown in fig. 2, the inspection circuit includes: the equipment motor power supply is electrically connected with the gating switching circuit through the inspection circuit, and the gating switching circuit is electrically connected with the PLC; the frequency converter is electrically connected with the equipment motor to be patrolled through the gating switching circuit; the frequency converter is electrically connected with the encoder of the gating switching circuit; as shown in fig. 1, the system further comprises a plurality of inspection equipment basic units connected with an overload device and a decoder, wherein the inspection equipment basic units output point detection signal states (24V and 24 VED) through a programmable logic controller (DO), and fault inspection is performed on all the gated matrix switching equipment through a decoding circuit; and the inspection circuit supplies two paths of power to each equipment motor, and cuts off the power signal of the equipment motor to carry out inspection of gating equipment when the gating equipment is inspected. The inspection circuit can realize the inspection of 63 devices at maximum.
Optionally, the gating switching circuit comprises matrix gating switching for connecting the frequency converter and the PLC controller, electronic switching for connecting a motor power supply of the equipment and a forced voltage superposition switching signal and contactor switching.
Optionally, the inspection equipment basic unit controls 16 stage mechanical equipment power supplies (dual power supplies 24V and 24 VED), the PLC controller decodes and selects inspection equipment through a circuit wiring terminal XDC2, when the unselected equipment is inspected, the equipment power supplies are all normally turned on, and after the equipment is selected, all switching signal states of the equipment power supplies 24V and 24VED are cut off to be forced to be no voltage; and judging the state change of the signal of the equipment to be patrolled, and determining whether the matrix switching is correct or not and whether the switching circuit element is faulty or not. 1 indicates a voltage, and 0 indicates no voltage.
As shown in fig. 2, a method for using a stage mechanical switching control safety detection device includes performing fault diagnosis by switching a patrol circuit signal of a patrol judging circuit and a matrix of a matrix switching circuit, judging the patrol circuit signal of a power supply of a device to be patrol (including the power on and off states of the device to be patrol), changing the matrix switching method when the patrol detects a fault, and re-patrol the judging circuit;
when the switching of each gating device is finished, carrying out inspection on the signal states of all selected devices, and judging whether crosstalk exists on other switching devices by a PLC (programmable logic controller); when the signal voltage state is unchanged, the matrix switching gating or inspection circuit fails;
the replacement matrix switching method comprises the following steps: the inspection circuit is used for performing inspection control on two paths of inspected equipment power supplies, and inspecting the signal voltage change of the inspected equipment;
detecting the state change of the protection signal of the gating equipment by using a PLC controller to finish detecting the abnormal switching faults of the matrix of the equipment to be patrolled;
and (3) sending a forced superposition power supply instruction to the inspection circuit through the PLC for the no-voltage state signal of the inspected equipment, and detecting the signal voltage of the protection signal state of the motor of the gating equipment. Fig. 4 shows a re-matrix switching method when a fault is detected.
As shown in fig. 3, in the signal inspection process, when the level is uncertain and the inspection is performed on the switching device, the signal state of the encoder is judged by the forced voltage to perform inspection switching interface judgment, the main loop of the contactor is connected with the auxiliary contact of the contactor through a mechanical connecting rod, the state of the main contact is consistent with that of the auxiliary signal contact of the contactor, the main contact is in an adhesion state, and the signal state before switching can be judged and confirmed by detecting. The '1' signal superposition switching circuit is forced to form an OR logic relationship with the detection signal, and meanwhile, the mutual influence among different equipment signals is effectively isolated through an optical coupler, and the equipment motor is identified as M.
Optionally, the judging of the patrol circuit signal of the power supply of the device to be patrol includes: when the inspection is not output, the power supply of the equipment signal is switched on, and each gating equipment protects whether the signal is in a full-voltage state or not; for other encoder signals, when the PLC detects that the signal state of the equipment is not satisfied and is not the voltage, the PLC gives out a compulsory output superposition voltage signal, detects and judges whether the protection signal of each gating equipment is in a full voltage state again, and when the signal state is detected to be in a full voltage state, the PLC enters the inspection equipment to output the next detection step, and then the contactor contacts are subjected to switching failure, and delay is carried out after the inspection equipment address is output; giving a device switching error prompt if the voltage is not the full voltage; detecting whether the state of the matrix switching signal is completely voltage-free, and if the state of the equipment signal is detected to be voltage-free, then the switching point is in fault;
after the address of the inspection gating device is output in a gating way, the inspection gating device enters into the inspection of power off, the PLC detects the state of a matrix switching signal to judge whether the feedback signal of each device meets the state of no voltage, and when the detection signal has no voltage, the matrix switching is normal; if the total no-voltage is not satisfied, giving a device switching error prompt; the PLC controller replaces a matrix switching method, performs matrix gating switching control on the gated equipment again, completes redundant matrix switching, and re-inspection judgment; when the redundancy switching permission times are exceeded, the matrix switching gating fails, equipment with gating switching failure is not allowed to operate, a switching equipment frequency converter which is successfully switched is electrified, and the switching equipment operates.
Switching faults occur, the newly switched loop gating is selected through redundancy switching, the number of times of redundancy matrix switching is the number of matrix switching frequency converters, each time of matrix switching is abnormal, the frequency converters are automatically adjusted to be ordered, matrix switching is repeated, fault safety inspection is conducted again, and fault circuits are avoided. The switching circuit part and the inspection circuit part abnormal faults include: switching circuit component failure, inspection circuit component failure, and protection signal abnormality failure.
The circuit delay of each inspection device is within 50-100 ms; the inspection of one device is completed, and the inspection of 10 devices is not more than 1000ms in order not to influence the gating of the next device.
The specific process of protecting signal inspection is as follows: as shown in fig. 4, the switching circuit judges the initial value, judges the number of the hanger rod switched by the frequency converter, does not change the number of times of the matrix switching method, detects the state of the external signal of the equipment switched to the frequency converter, does not equal to 1, forcibly outputs the superimposed 1 signal to the input end of the switching circuit, waits, detects the state of the external signal of the equipment switched to the frequency converter as 1, cuts off the signal power supply for waiting, and detects the state of the external signal of the equipment switched to the frequency converter as 0; detecting the switching of the next frequency converter, and finishing the inspection detection of the switching of the frequency converter; and (5) setting a switching completion mark, and replacing the number of matrix switching methods, RET.
If the external signal state of the equipment switched to the frequency converter is detected to be not all 1 or not all 0, changing the matrix switching method, clearing the gating output of the frequency converter equipment, and returning to the switching line to judge the set initial value according to the cyclic change of the gating output of the frequency converter equipment;
replacing the number of times of matrix switching methods, and after switching the replacement failure mark, RET;
the inspection and detection of the switching of the frequency converter is not completed, the number of the boom equipment switched by the frequency converter is judged, and the switching of the next frequency converter is detected.
Matrix switching flow: as shown in fig. 5, the boom switching enable signal indicates that the boom has a boom switching end flag, the forward and reverse switching flag DIR is determined to be 0, the frequency converter number is 1, the frequency converter has no disable flag, the frequency converter is determined to be not idle, the forward and reverse switching flag is determined to be 0, the frequency converter is added with 1, and the frequency converter is scanned; if the frequency converter is idle, the matrix is subjected to corner cutting, the step is skipped when the matrix is full, the boom equipment number is set to the frequency converter address (occupation mark), the boom equipment number is added with 1, the boom switching is finished, and the total number of equipment is larger than RET.
The switching boom is not detected, and a boom switching enabling signal is generated;
the forward and reverse switching flag DIR is not 0, the total number of frequency converters i,
the frequency converter has a forbidden mark, the frequency converter gating suspender is cleared, the forward and reverse switching mark DIR is not 0, the frequency converter is reduced by 1, and the frequency converter is scanned completely, and the switching suspender equipment is added by 1. The switching state is always kept after the matrix is switched. Fig. 6 is a device for canceling all strobes after canceling matrix switching.
The switching of each device is accomplished while a single patrol of all selected devices is required to prevent crosstalk between all possible devices. In order not to influence the gating of the next device, the inspection of each inspected device is completed within 50-100 ms of circuit delay, and the inspection of 10 devices is not more than 1000ms.
The above description is for the purpose of illustrating the embodiments of the present invention and is not to be construed as limiting the invention, but is intended to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principle of the invention.
Claims (10)
1. The utility model provides a stage machinery switches control safety inspection device, includes matrix switching circuit, inspection judgement circuit and participates in judging and redundant PLC controller who switches, its characterized in that: the matrix switching circuit is electrically connected with the inspection judging circuit; the inspection judging circuit comprises a plurality of frequency converters electrically connected with the PLC through a frequency converter communication network, and a matrix switching gating and inspection circuit electrically connected with the PLC under control of the PLC, wherein the PLC, the frequency converters and the matrix switching gating form a loop, the switching failure of the matrix switching circuit and the fault diagnosis of the inspection judging circuit are completed through the PLC, and the matrix switching circuit connects the equipment motor and the signal gating associated with the motor to the corresponding frequency converter; the PLC controls the electrically connected equipment signal power supply and external forced superposition signals through inspection scanning, detects the state of the matrix switching circuit, and the electrically connected equipment signal power supply and external forced superposition signals are electrically connected with matrix switching gating.
2. The stage mechanical switching control safety detection device according to claim 1, wherein the matrix switching circuit operates a main circuit of a full matrix equipment motor and signal gating switching, and comprises a switching circuit and a contactor; the switching circuit includes: encoder signals, gating equipment protection signals, contactor operation equipment motor main loop, brake control, limit maintenance, upper limit, lower limit and load signal gating switch, wherein the switch circuit comprises an electronic circuit or a relay.
3. The stage mechanical switching control safety detection device according to claim 2, wherein the equipment protection signal after switching is collected by a DI point of the frequency converter, and is transmitted to the PLC controller through a communication network of the frequency converter, or the equipment protection signal after switching is collected by a DI point of the PLC controller; the matrix switching device realizes the gating switching of the motor of the device through the output gating by the DO output point of the PLC.
4. The stage mechanical switching control safety detection device according to claim 1, wherein the inspection judgment circuit includes: the equipment motor power supply is electrically connected with the gating switching circuit through the inspection circuit, and the gating switching circuit is electrically connected with the PLC; the frequency converter is electrically connected with the equipment motor to be patrolled through the gating switching circuit; the frequency converter is electrically connected with the encoder of the gating switching circuit; the system also comprises an overload device and a plurality of inspection equipment basic units connected with a decoder, wherein the inspection equipment basic units output a point detection signal state through a PLC (programmable logic controller) DO, and fault inspection is carried out on all the gated matrix switching equipment through a decoding circuit; and the inspection circuit supplies two paths of power to each equipment motor, and cuts off the power signal of the equipment motor to carry out inspection of gating equipment when the gating equipment is inspected.
5. The stage mechanical switching control safety inspection device according to claim 4, wherein the gating switching circuit includes a matrix gating switching connecting the frequency converter and the PLC controller, an electronic switching connecting the equipment motor power supply and the forced voltage superposition switching signal, and a contactor switching.
6. The safety detection device for switching control of stage machinery according to claim 4, wherein the inspection equipment basic unit controls a plurality of stage machinery power supplies, the PLC controller selects inspection equipment through the circuit connection terminal XDC2 decoding, when the unselected equipment is inspected, all equipment power supplies are normally turned on, and after the equipment is selected, all switching signal states of the equipment power supplies are cut off to force no voltage; and judging the state change of the signal of the equipment to be patrolled, and determining whether the matrix switching is correct or not and whether the matrix switching circuit element fails or not.
7. The use method of the stage mechanical switching control safety detection device comprises the steps of finishing fault diagnosis by switching the inspection circuit signals of the inspection judgment circuit and the matrix of the matrix switching circuit, and is characterized in that the inspection circuit signals of the power supply of the inspected equipment are judged, when the inspection is finished, the matrix switching method is replaced, and the inspection judgment circuit is re-inspected;
when the switching of each gating device is finished, carrying out inspection on the signal states of all selected devices, and judging whether crosstalk exists on other switching devices by a PLC (programmable logic controller); when the signal voltage state is unchanged, the matrix switching gating or inspection circuit fails;
the replacement matrix switching method comprises the following steps: the inspection circuit is used for performing inspection control on two paths of inspected equipment power supplies, and inspecting the signal voltage change of the inspected equipment;
detecting the state change of the protection signal of the gating equipment by using a PLC controller to finish detecting the abnormal switching faults of the matrix of the equipment to be patrolled;
and (3) sending a forced superposition power supply instruction to the inspection circuit through the PLC for the no-voltage state signal of the inspected equipment, and detecting the signal voltage of the protection signal state of the motor of the gating equipment.
8. The method for using a stage mechanical switching control safety inspection device according to claim 7, wherein the step of determining the inspection circuit signal of the power source of the inspected equipment comprises: when the inspection is not output, the power supply of the equipment signal is switched on, and each gating equipment protects whether the signal is in a full-voltage state or not; for other encoder signals, when the PLC detects that the signal state of the equipment is not satisfied and is not the voltage, the PLC gives out a compulsory output superposition voltage signal, detects and judges whether the protection signal of each gating equipment is in a full voltage state again, and when the signal state is detected to be in a full voltage state, the PLC enters the inspection equipment to output the next detection step, then the contact of the contactor is subjected to switching failure, and the address of the inspection equipment is output and then delayed; giving a device switching error prompt if the voltage is not the full voltage; detecting whether the state of the matrix switching signal is completely voltage-free, and if the state of the equipment signal is detected to be voltage-free, then the switching point is in fault; after the address of the inspection gating device is output in a gating way, the inspection gating device enters into the inspection of power off, the PLC detects the state of a matrix switching signal to judge whether the feedback signal of each device meets the state of no voltage, and when the detection signal has no voltage, the matrix switching is normal; if the total no-voltage is not satisfied, giving a device switching error prompt; the PLC controller replaces a matrix switching method, performs matrix gating switching control on the gated equipment again, completes redundant matrix switching, and re-inspection judgment; when the redundancy switching permission times are exceeded, the matrix switching gating fails, equipment with gating switching failure is not allowed to operate, a switching equipment frequency converter which is successfully switched is electrified, and the switching equipment operates.
9. The method according to claim 7, wherein a switching failure occurs, a newly switched loop gate is selected by redundancy switching, the number of redundancy matrix switching is the number of matrix switching frequency converters, each time the matrix switching fails abnormally, the frequency converters are automatically adjusted to order, the matrix switching is resumed, and the fail-safe inspection is performed again.
10. The method of claim 7, wherein the circuit delay of the equipment is within 50-100 ms.
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