Safety protection device and safety protection method for monitoring accidental extrusion in hoistway
By setting up pressure and distance detection devices and human infrared detection devices in the elevator shaft, real-time monitoring of the distance between the car and the shaft wall and whether there is a human body in the dangerous area, it solves the problem that the existing technology cannot effectively prevent the car and the inner wall of the shaft from being squeezed. The problem of injury has achieved the effect of stopping the elevator before the danger occurs and ensuring the safety of the operators.
Patent Information
- Application Number
- CN202411362836.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2024-12-17
AI Technical Summary
The existing elevator shaft construction technology cannot effectively prevent accidental squeeze and injury between the car and the inner wall of the shaft, especially when the operation is not carried out according to the specifications, maintenance or stop switch fails.
Use pressure and distance detection devices and human infrared detection devices to detect the distance between the car and the shaft wall through pressure sensors and laser distance measuring sensors, and use human infrared sensors to monitor whether human bodies are in dangerous areas, and control the elevator to start and stop in real time to ensure that Stop running in a timely manner in dangerous situations.
Effectively prevent the crushing and injury accident between the car and the inner wall of the shaft, improve the safety of the operators, and avoid unnecessary elevator shutdown caused by non-human foreign objects.
Smart Images
Figure CN119142949A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of elevator shaft safety construction, and in particular to a safety protection device and a safety protection method for monitoring accidental squeezing in a shaft. Background Art
[0002] At present, there are some countermeasures for the safety issues of workers working in elevator shafts, such as car top inspection and stop switch settings. In "GB / T 7588.1-2020 Safety Specifications for Elevator Manufacturing and Installation Part 1: Passenger Elevators and Freight Elevators" and "TSG T7001-2023 Rules for Elevator Supervision Inspection and Periodic Inspection", there are also requirements for the safety space at the top and bottom of the shaft. However, when working in the shaft, due to failure to follow the standardized work process, or when maintenance or stop switches fail, accidents often occur in which workers are injured or killed due to accidental squeezing while working in the shaft.
[0003] In the prior art, the utility model patent with application number CN202321670308.8 provides a construction elevator in a building, including a traction machine, a load-bearing beam assembly, a traction rope, a plurality of safety doors, a car, a safety system, a buffer, a counterweight, a main rail and a secondary rail. The load-bearing beam assembly is arranged at the topmost position of the shaft of the construction building, the traction machine is arranged on the load-bearing beam assembly, the traction rope passes through the traction machine and the top of the car in sequence from the counterweight connecting end to the load-bearing beam assembly connecting end, the main rail and the secondary rail are both arranged vertically along the side wall of the shaft, the car is arranged on the main rail, the counterweight is arranged on the secondary rail, the car is arranged below the load-bearing beam assembly, the buffer is arranged directly below the car on the bottom surface of the shaft, the safety door is arranged at the floor door position of the non-top floor of the shaft, and the safety system is arranged between the load-bearing beam assembly and the bottom surface of the shaft.
[0004] In the prior art, an invention patent with application number CN202111611980.5 provides a safe construction method for a shaft elevator, wherein a climbing frame and a construction elevator are provided in the shaft, and the construction method comprises: transporting the construction elevator assembly into the shaft, and setting up a protective device above the construction elevator installation area in the shaft; installing the construction elevator in the area below the protective device, and synchronously constructing a climbing frame above the protective device; after the construction elevator is assembled, the climbing frame is installed, and the bottom of the climbing frame is closed, the supporting scaffolding, horizontal steel beams, and protective devices are removed, and the protective structure on the truss structure provides safety protection for the construction elevator.
[0005] The construction elevator in the building provided by the first patent mentioned above mainly solves the safety problem of the elevator itself, but does not solve the safety problem of accidental squeezing and injuring people between the car and the inner wall of the shaft. The safety construction method provided by the second patent mentioned above uses the erected protective device to ensure that the construction elevator and the climbing frame can be constructed synchronously during the construction phase; during the operation phase, the protective structure on the construction elevator provides safety protection to prevent falling objects from directly hitting the elevator car. However, this safety construction method does not solve the safety problem of squeezing and injuring people between the car and the inner wall of the shaft. Summary of the invention
[0006] The purpose of the present invention is to provide a safety protection device and a safety protection method for monitoring accidental squeezing in a hoistway, aiming to improve the problem that the existing construction elevators and safety construction methods in the elevator hoistway cannot effectively prevent accidental squeezing and injury between the car and the inner wall of the hoistway.
[0007] In order to achieve the above object, according to one aspect of the present invention, the present invention provides a safety protection device for monitoring accidental squeezing in a hoistway, comprising a frequency converter main control board for controlling the start and stop of an elevator, and also comprising:
[0008] A pressure and distance detection device is arranged on the top of the elevator car; the pressure and distance detection device comprises a pressure detection module, a distance measurement module and a first controller module, the pressure detection module and the distance measurement module are both electrically connected to the first controller module, and the first controller module is electrically connected to the inverter main control board;
[0009] The human infrared detection device is arranged on the wall of the shaft; the human infrared detection device comprises a human detection module and a second controller module, and the second controller module is electrically connected to the inverter main control board.
[0010] Furthermore, the pressure detection module is used to detect the pressure on the top of the car and transmit the detected pressure value to the first controller module, which compares the received detected pressure value with the internally set pressure threshold; the distance measuring module is used to measure the distance between it and the shaft wall and transmit the detected distance value to the first controller module, which calculates the distance between the outer wall of the elevator car and the shaft wall based on the received detection distance value, and compares the calculated result with the internally set distance threshold to determine the dangerous area.
[0011] Furthermore, when the distance between the outer wall of the elevator car and the hoistway wall is not greater than a distance threshold, the location of the elevator car is a dangerous area.
[0012] Furthermore, the pressure detection module is a pressure sensor, the distance measurement module is a laser distance measurement sensor, and the first controller module is a single chip microcomputer controller or a PLC controller.
[0013] Furthermore, the human body detection module is used to detect whether there is a human body in the dangerous area, and transmit the detection result signal to the second controller module. The second controller module determines whether to send a shutdown signal to the inverter main control board according to the detection result.
[0014] Furthermore, the human detection module is a human infrared sensor, and the second controller module is a single chip microcomputer controller or a PLC controller.
[0015] Furthermore, the pressure detection module and the ranging module of the pressure and distance detection device are provided with four groups, and the four groups of pressure detection modules and ranging modules are respectively arranged at the edges of the four sides of the top of the elevator car; the human body detection module of the human body infrared detection device is provided with four groups, and the four groups of human body detection modules are respectively arranged on the four inner walls of the shaft wall.
[0016] Furthermore, the pressure and distance detection device and the human infrared detection device both have a data storage device and a wireless transmission module, the data storage device and the wireless transmission module are both electrically connected to the corresponding controller module, and the data storage device is electrically connected to a reserved interface.
[0017] According to a second aspect of the present invention, the present invention provides a safety protection method for preventing accidental squeezing in a well, and using the safety protection method for preventing accidental squeezing in a well, the method comprises the following steps:
[0018] S100, when the elevator is running, the pressure detection module of the pressure and distance detection device is powered, detects the pressure on the top of the car, and transmits the detected pressure value to the first controller module;
[0019] S200, the first controller module compares the received detection pressure value with an internally set pressure threshold;
[0020] S300, when the detection pressure value received by the first controller module is less than or equal to the pressure threshold, the pressure detection module is powered off and the elevator keeps running; when the detection pressure value received by the first controller module is greater than the pressure threshold, proceed to the next step;
[0021] S400, the distance measuring module of the pressure and distance detecting device is powered, the distance measuring module measures the distance between itself and the shaft wall, and transmits the detected distance value to the first controller module, and the first controller module calculates the distance between the outer wall of the elevator car and the shaft wall according to the received detected distance value;
[0022] S500, the first controller module compares the calculation result with the internally set distance threshold. When the distance between the outer wall of the elevator car and the hoistway wall is greater than the distance threshold, the distance measurement module continues to measure until the pressure value detected by the pressure detection module is less than or equal to the pressure threshold, the pressure detection module is powered off, and the distance measurement module is powered off;
[0023] S600: When the distance between the outer wall of the elevator car and the hoistway wall is not greater than the distance threshold, the elevator car is located in a dangerous area, and the first controller module transmits a signal to the inverter main control board. After receiving the signal, the inverter main control board transmits a signal to the second controller module of the human infrared detection device. After receiving the signal, the second controller module controls the human detection module to be powered on.
[0024] S700, the human body detection module detects whether there is a human body in the dangerous area, and transmits the detection result signal to the second controller module;
[0025] S800. If there is no human body in the dangerous area, the elevator keeps running; if there is a human body in the dangerous area, the second controller module sends a stop signal to the inverter main control board, and the inverter main control board controls the elevator to stop running.
[0026] Furthermore, the pressure threshold is 0-30kg, and the distance threshold is 500-600mm.
[0027] Compared with the prior art, the present invention has the following beneficial effects:
[0028] 1. The safety protection method for preventing accidental squeezing in the shaft and the safety protection method for preventing squeezing in the shaft provided by the present invention can play a safety protection role when operations are not carried out according to the standardized workflow, or when maintenance or stop switches fail. It can prevent the problem of squeezing and injuring people between the car and the inner wall of the shaft, and can stop the elevator before the danger occurs, effectively ensuring the safety of the operators.
[0029] 2. The present invention monitors the presence of human bodies in dangerous areas by means of human infrared monitoring, which can avoid unnecessary stopping of the elevator when non-human foreign objects appear.
[0030] 3. The pressure and distance detection device and the human infrared detection device of the present invention also have a data storage device and a wireless transmission module. Each data storage device is electrically connected to a reserved interface. Therefore, the detection data of the pressure and distance detection device and the human infrared detection device of the present invention can be sent to the central database and the big data monitoring platform through the wireless transmission module in the form of wireless signals or through the data storage device and the reserved interface in the form of hard disk and data cable transfer, as a big data sample and for calculation by the monitoring platform. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 This is a block diagram of the electric control structure of the safety protection method for preventing accidental squeezing in a shaft provided by Embodiment 1 of the present invention;
[0032] Figure 2 It is a schematic diagram of the position and structure of the safety protection method for preventing accidental squeezing in the hoistway provided by Embodiment 1 of the present invention in the elevator hoistway;
[0033] Figure 3 It is a flow chart of the anti-extrusion safety protection method in the shaft provided in Example 2 of the present invention.
[0034] Figure numerals: 1. pressure and distance detection device; 2. human infrared detection device; 3. elevator car; 4. shaft wall; 5. inverter main control board. DETAILED DESCRIPTION
[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0036] The following is a further description with reference to the accompanying drawings and specific embodiments:
[0037] Example 1
[0038] A safety protection device for monitoring accidental squeezing in a shaft, such as Figure 1 and Figure 2As shown, it includes a frequency converter main control board 5 for controlling the start and stop of the elevator, and a pressure and distance detection device 1 and a human infrared detection device 2 electrically connected to the frequency converter main control board 5. The pressure and distance detection device 1 is arranged on the top of the elevator car 3 and moves synchronously with the elevator car 3. The pressure and distance detection device 1 includes a shell and a pressure detection module, a distance measurement module and a first controller module arranged in the shell. The pressure detection module is a pressure sensor, the distance measurement module is a laser distance measurement sensor, and the first controller module is a single chip microcomputer. The pressure sensor and the laser distance measurement sensor are both electrically connected to the single chip microcomputer, and the single chip microcomputer is electrically connected to the frequency converter main control board 5. There are four groups of pressure sensors and laser distance measurement sensors of the pressure and distance detection device 1, and the four groups of pressure sensors and laser distance measurement sensors are respectively arranged at the edges of the four sides of the top of the elevator car 3. Or there are four pressure and distance detection devices 1, and these four pressure and distance detection devices 1 are respectively arranged at the edges of the four sides of the top of the elevator car 3, and the single chip microcomputers of these four pressure and distance detection devices 1 are all electrically connected to the frequency converter main control board 5. The housing of the pressure and distance detection device 1 is provided with an accompanying cable interface, to which a cable is connected, so as to meet the requirement that the pressure and distance detection device 1 moves synchronously with the elevator car 3 .
[0039] The pressure sensor is used to detect the pressure on the top of the elevator car 3, and transmits the detected pressure value to the single-chip microcomputer of the pressure and distance detection device 1. The single-chip microcomputer of the pressure and distance detection device 1 compares the received detected pressure value with the internally set pressure threshold to confirm whether there is anyone on the top of the elevator car 3. When the initial pressure on the pressure sensor is zero, the pressure threshold is set to 0-30kg, and the weight of the maintenance personnel will not be less than 30kg. When the detected pressure value is less than or equal to the pressure threshold, it means that there is no one on the top of the elevator car 3. When the detected pressure value is greater than the pressure threshold, it means that there is someone on the top of the elevator car 3. The laser distance sensor is used to measure the distance between it and the shaft wall 4, and transmits the detected distance value to the single-chip microcomputer of the pressure and distance detection device 1. The single-chip microcomputer of the pressure and distance detection device 1 calculates the distance between the outer wall of the elevator car 3 and the shaft wall 4 according to the received detected distance value and the internally set calculation formula, and compares the calculation result with the internally set distance threshold to determine whether it is a dangerous area. When the distance between the outer wall of the elevator car 3 and the shaft wall 4 is not greater than the distance threshold, the elevator car 3 is located in a dangerous area. The distance threshold is set to 500-600mm. Referring to the maximum shoulder width data in GB / T 10000-2023 Chinese Adult Human Body Dimensions, the distance threshold should not be set less than 500mm, nor should it be set too large, otherwise the entire elevator shaft will be a dangerous area, and there is no need to set up a laser distance sensor for detection and calculation.
[0040] like Figure 1 and Figure 2 As shown, the human body infrared detection device 2 is provided with four groups of human body detection modules, which are respectively arranged on the four inner walls of the shaft wall 4, and are respectively used to detect whether there is a human body in the space around the elevator car 3 and the shaft wall 4. The human body infrared detection device 2 includes a human body detection module and a second controller module. The human body detection module is a human body infrared sensor, and the second controller module is a single-chip microcomputer. The human body infrared sensor is electrically connected to the single-chip microcomputer, and the single-chip microcomputer is electrically connected to the inverter main control board 5. The human body infrared sensor is used to detect whether there is a human body in the dangerous area, and transmit the detection result signal to the single-chip microcomputer of the human body infrared detection device 2. The single-chip microcomputer module of the human body infrared detection device 2 determines whether to send a stop signal to the inverter main control board 5 according to the detection result.
[0041] like Figure 1 As shown, the pressure and distance detection device 1 and the human infrared detection device 2 are also provided with a data storage device and a wireless transmission module. The data storage device and the wireless transmission module of the pressure and distance detection device 1 are electrically connected to the single-chip microcomputer of the pressure and distance detection device 1, and the data storage device and the wireless transmission module of the human infrared detection device 2 are electrically connected to the single-chip microcomputer of the human infrared detection device 2, and each data storage device is electrically connected to a reserved interface. By setting up the wireless transmission module, the pressure and distance detection device 1 and the human infrared detection device 2 can send the detection data to the central database and the big data monitoring platform by means of wireless signals, as a big data sample and for the use of the monitoring platform for calculation. By setting up the data storage device and the reserved interface, the pressure and distance detection device 1 and the human infrared detection device 2 can first store the detection data in the data storage device, and then transmit the detection data to the central database and the big data monitoring platform through the hard disk, the data cable and the reserved interface, as a big data sample and for the use of the monitoring platform for calculation.
[0042] Example 2
[0043] This embodiment provides a safety protection method for preventing accidental squeezing in a well. The safety protection method for preventing accidental squeezing in a well provided in Example 1 is used. Figure 3 As shown, the following steps are included:
[0044] S100, when the elevator is running, the pressure sensor of the pressure and distance detection device 1 is powered, detects the pressure on the top of the car, and transmits the detected pressure value to the single chip microcomputer of the pressure and distance detection device 1.
[0045] S200, the single chip microcomputer of the pressure and distance detection device 1 compares the received detection pressure value with the internally set pressure threshold;
[0046] S300, when the detected pressure value received by the single-chip microcomputer of the pressure and distance detection device 1 is less than or equal to the pressure threshold, the pressure sensor is powered off and the elevator keeps running. The pressure sensor is initially subjected to zero pressure, and when the detected pressure value is equal to 0, the pressure sensor is powered off and the elevator keeps running. When the detected pressure value received by the single-chip microcomputer of the pressure and distance detection device 1 is greater than the pressure threshold, the next step is performed. The pressure sensor is initially subjected to zero pressure, and when the detected pressure value is greater than 0 or non-0, the next step is performed.
[0047] S400, the laser distance measuring sensor of the pressure and distance detecting device 1 is powered, the laser distance measuring sensor measures the distance between it and the shaft wall 4, and transmits the detected distance value to the single chip microcomputer of the pressure and distance detecting device 1, and the single chip microcomputer of the pressure and distance detecting device 1 calculates the distance between the outer wall of the elevator car 3 and the shaft wall 4 according to the received detected distance value.
[0048] S500, the single chip microcomputer of the pressure and distance detection device 1 compares the calculation result with the internally set distance threshold, and the distance threshold is set to 500mm. When the distance between the outer wall of the elevator car 3 and the shaft wall 4 is greater than 500mm, the laser ranging sensor continues to measure until the pressure value detected by the pressure sensor is less than or equal to the pressure threshold, the pressure sensor is powered off, and the ranging module is powered off. The initial pressure on the pressure sensor is zero, then until the pressure value detected by the pressure sensor is equal to 0, the pressure sensor is powered off, and the ranging module is powered off.
[0049] S600. When the distance between the outer wall of the elevator car 3 and the shaft wall 4 is not greater than 500 mm, the elevator car 3 is determined to be located in a dangerous area. The single-chip microcomputer of the pressure and distance detection device 1 transmits a signal to the inverter main control board 5. After receiving the signal, the inverter main control board 5 transmits a signal to the single-chip microcomputer of the human infrared detection device 2. After receiving the signal, the single-chip microcomputer of the human infrared detection device 2 controls the human infrared sensor to be powered.
[0050] S700 , the human infrared sensor detects whether there is a human body in the dangerous area, and transmits the detection result signal to the single chip microcomputer of the human infrared detection device 2 .
[0051] S800, if there is no human body in the dangerous area, the elevator keeps running; if there is a human body in the dangerous area, the single chip microcomputer of the human infrared detection device 2 sends a stop signal to the inverter main control board 5, and the inverter main control board 5 controls the elevator to stop running.
[0052] The safety protection method for preventing accidental squeezing in the shaft and the safety protection method for preventing squeezing in the shaft provided by the present invention can play a safety protection role when there is an operation that does not follow the standardized workflow, or when the maintenance or stop switch fails, and can prevent the problem of squeezing and injuring people between the car and the inner wall of the shaft, and can stop the elevator before the danger occurs, effectively ensuring the safety of the operators. In addition, the present invention monitors the presence of human bodies in dangerous areas by human infrared monitoring, which can avoid the situation where the elevator stops running unnecessarily when non-human foreign objects appear.
[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A safety protection device for monitoring accidental squeezing in a hoistway, comprising a frequency converter main control board (5) for controlling the start and stop of an elevator, It is characterized in that Also includes: A pressure and distance detection device (1) is arranged on the top of an elevator car (3); the pressure and distance detection device (1) comprises a pressure detection module, a distance measurement module and a first controller module, the pressure detection module and the distance measurement module are both electrically connected to the first controller module, and the first controller module is electrically connected to a frequency converter main control board (5); A human infrared detection device (2) is arranged on a shaft wall (4); the human infrared detection device (2) comprises a human detection module and a second controller module, wherein the second controller module is electrically connected to a frequency converter main control board (5).
2. A safety protection device for monitoring accidental squeezing in a shaft according to claim 1, It is characterized in that The pressure detection module is used to detect the pressure on the top of the elevator car and transmit the detected pressure value to the first controller module, and the first controller module compares the received detected pressure value with the internally set pressure threshold; the distance measurement module is used to measure the distance between it and the shaft wall (4) and transmit the detected distance value to the first controller module, and the first controller module calculates the distance between the outer wall of the elevator car (3) and the shaft wall (4) based on the received detected distance value, and compares the calculated result with the internally set distance threshold to determine the danger zone.
3. A safety protection device for monitoring accidental squeezing in a shaft according to claim 2, It is characterized in that When the distance between the outer wall of the elevator car (3) and the shaft wall (4) is not greater than a distance threshold, the location of the elevator car (3) is a dangerous area.
4. A safety protection device for monitoring accidental squeezing in a shaft according to claim 2, It is characterized in that The pressure detection module is a pressure sensor, the distance measurement module is a laser distance measurement sensor, and the first controller module is a single chip microcomputer controller or a PLC controller.
5. A safety protection device for monitoring accidental squeezing in a shaft according to claim 2, It is characterized in that The human body detection module is used to detect whether there is a human body in the dangerous area and transmit the detection result signal to the second controller module. The second controller module determines whether to send a shutdown signal to the inverter main control board (5) according to the detection result.
6. A safety protection device for monitoring accidental squeezing in a shaft according to claim 5, It is characterized in that The human body detection module is a human body infrared sensor, and the second controller module is a single chip microcomputer controller or a PLC controller.
7. A safety protection device for monitoring accidental squeezing in a shaft according to claim 1, It is characterized in that The pressure and distance detection device (1) is provided with four groups of pressure detection modules and distance measurement modules, and the four groups of pressure detection modules and distance measurement modules are respectively arranged at the edges of the four sides of the top of the elevator car (3); the human body detection module of the human body infrared detection device (2) is provided with four groups, and the four groups of human body detection modules are respectively arranged on the four inner walls of the shaft wall (4).
8. The safety protection device for monitoring accidental squeezing in a shaft according to claim 1, It is characterized in that The pressure and distance detection device (1) and the human infrared detection device (2) both further comprise a data storage device and a wireless transmission module, the data storage device and the wireless transmission module both being electrically connected to the corresponding controller module, and the data storage device being electrically connected to a reserved interface.
9. A safety protection method for preventing accidental squeezing in a shaft, using the safety protection device for monitoring accidental squeezing in a shaft as claimed in any one of claims 1 to 8, It is characterized in that The steps include: S100, when the elevator is running, the pressure detection module of the pressure and distance detection device (1) is powered, detects the pressure on the top of the car, and transmits the detected pressure value to the first controller module; S200, the first controller module compares the received detection pressure value with an internally set pressure threshold; S300, when the detection pressure value received by the first controller module is less than or equal to the pressure threshold, the pressure detection module is powered off and the elevator keeps running; when the detection pressure value received by the first controller module is greater than the pressure threshold, proceed to the next step; S400, the distance measuring module of the pressure and distance detecting device (1) is powered, the distance measuring module measures the distance between itself and the shaft wall (4), and transmits the detected distance value to the first controller module, and the first controller module calculates the distance between the outer wall of the elevator car (3) and the shaft wall (4) based on the received detected distance value; S500, the first controller module compares the calculation result with the distance threshold set internally, and when the distance between the outer wall of the elevator car (3) and the shaft wall (4) is greater than the distance threshold, the distance measurement module continues to measure until the pressure value detected by the pressure detection module is less than or equal to the pressure threshold, the pressure detection module is powered off, and the distance measurement module is powered off; S600: When the distance between the outer wall of the elevator car (3) and the shaft wall (4) is not greater than a distance threshold, the elevator car (3) is located in a dangerous area, the first controller module transmits a signal to the inverter main control board (5), and after receiving the signal, the inverter main control board (5) transmits a signal to the second controller module of the human infrared detection device (2), and after receiving the signal, the second controller module controls the human detection module to be powered on; S700, the human body detection module detects whether there is a human body in the dangerous area, and transmits the detection result signal to the second controller module; S800: If there is no human body in the dangerous area, the elevator keeps running; if there is a human body in the dangerous area, the second controller module sends a stop signal to the inverter main control board (5), and the inverter main control board (5) controls the elevator to stop running.
10. A safety protection method for preventing accidental squeezing in a shaft according to claim 9, It is characterized in that The pressure threshold is 0-30kg, and the distance threshold is 500-600mm.