Independent protection system for accidental movement of lift car in new standard transformation of elevator

Abstract

According to the independent protection system for accidental movement of the new standard transformed lift car of the elevator, firstly, a competitive lift car accidental movement protection device is established, the increasingly obvious price competition requirement of the transformed elevator market is met, and transformed elevator products are helped to be popularized to more projects; secondly, starting from the analysis standard and the content of a modification list, which elevator needs to be additionally provided with a car accidental movement protection device is fully understood, and unnecessary feedback components are prevented from being additionally arranged blindly or mistakenly; 3, on the premise of flexible installation, door contact signals and door area signals are introduced to the independent protection logic unit for accidental movement of the lift car in parallel by applying independent safety contacts and safety circuits, so that the function of an electric control system of an original lift is not influenced, and the protection function for accidental movement of the lift car can be added; 4, the conditions of the modification elevator are considered, the electrical control system of the original elevator is changed to the minimum, the operation of field personnel is facilitated, and the requirements of the standard and the protection of accidental movement of the lift car by a first modification list are met.

Description

Technical Field

[0001] The present application relates to an elevator car accidental movement protection system, and in particular to an elevator car accidental movement independent protection system modified according to a new standard, belonging to the technical field of elevator car protection. Background Art

[0002] Most elevator accidents are related to the elevator brake system and door system. As one of the most important safety protection devices in the elevator structure, once the elevator brake fails, it will cause serious consequences, just like the failure of the car brakes. As a protection device to prevent falling and shearing, the elevator door also plays a very important role in the safe operation of the elevator. When the elevator is at the level position and the door is open, if the car moves unexpectedly, it will seriously threaten the safety of passengers. The accidental movement protection of the car is one of the ways of shear protection at the entrance of the hall door. When the elevator is at the level position and the door is open, if the car moves unexpectedly, this protection function will work, stop the elevator, and protect the safety of passengers.

[0003] In order to implement the protection function against accidental movement of elevator cars as soon as possible, the emergency start elevator safety standard GB7588-2003 "Amendment No. 1 to the Safety Specifications for Elevator Manufacturing and Installation" (hereinafter referred to as "Amendment No. 1") stipulates that protection against accidental movement of the car is one of the three requirements added to Amendment No. 1, which aims to effectively prevent and reduce similar accidents and reduce elevator safety risks.

[0004] Definition of Amendment No. 1: In the unlocked area and with the door open, the movement of the car without instructions to leave the landing, excluding the movement caused by loading and unloading, is considered accidental movement of the car. Interpretation of the accidental movement protection device of the car: When the landing door is not locked and the car door is not closed, the elevator should have a device to prevent or stop the accidental movement of the car from leaving the landing due to the failure of any single component of the drive host or drive control system on which the safe operation of the car depends. The failure of the suspension rope, chain and traction wheel, roller, and sprocket is excluded. The failure of the traction wheel includes the sudden loss of traction capacity.

[0005] There are many possible causes for the accidental movement of the elevator car, which cannot be eradicated through general inspections. At the same time, there are many contingencies in the use of elevators. The possibility of accidental movement of the elevator car is not only difficult to avoid, but also cannot be completely eliminated, so there is a need for safety features to prevent accidental movement of the car.

[0006] The elevator car accidental movement protection device can reliably control the occurrence of accidental movement of the elevator car or the accidental movement of the elevator car for any reason. The device can detect it, stop the elevator and keep the elevator car stationary. Such a device is effective.

[0007] There are four elements to realize the function of the elevator car accidental movement protection device: 1) Brake unit monitoring to verify that it operates normally and can generate enough torque to stop the car when UCM occurs. There are two ways to implement it. One is to test the single-sided brake every day. When there are no passengers in the car, open the single-sided brake and monitor that the car has not moved. This is to ensure that each brake unit has enough torque to keep the empty car in its original position; the second is that the brake action monitoring switch is connected to the elevator's start-up permission circuit and monitors the brake falling. Regular manual testing of the single-sided brake ensures that the torque of the single-sided brake unit is sufficient to keep the empty car in its original position. 2) If the car moves unexpectedly, the brake stops the car. 3) The detection of unexpected car movement when the door is open is realized by double door zone monitoring, and the safety circuit is cut off when the door slides out of the door zone accidentally. 4) The memory records the unexpected car movement (UCM). The memory can store UCM information when the power is off. The elevator is kept in the out of service state until the memory is reset by the maintenance personnel after checking the system.

[0008] Therefore, the modified elevator also needs to add an independent protection system for accidental car movement, on the one hand to ensure that the modified elevator can meet the new elevator standards to the greatest extent, and on the other hand to increase the safety of the elevator. When the old elevator is partially modified, the existing technology cannot add a protection device on the basis of retaining the original elevator motor to achieve the protection function of accidental car movement.

[0009] The problems that need to be solved by the elevator car accidental movement protection system in the prior art and the key technical difficulties of this application include:

[0010] (1) Currently, most elevator accidents are related to the elevator braking system and door system. The elevator brake is one of the most important safety protection devices in the elevator structure. Once it fails, the brake failure will cause serious consequences. The elevator door, as a protection device to prevent falling and shearing, plays an important role in the safe operation of the elevator. When the elevator is at the level position and the door is open, if the car moves unexpectedly, it will seriously threaten the safety of passengers. The existing technology lacks reliable protection against accidental car movement and lacks a shear protection method for the hall door entrance. When the elevator is at the level position and the door is open, if the car moves unexpectedly, there is a lack of corresponding protection function to stop the elevator. The accuracy and timeliness of the elevator car accidental movement protection are relatively poor, and it is impossible to protect the safety of passengers.

[0011] (2) The prior art does not fully implement the requirements for protection against unexpected movement of elevator cars, and lacks the four elements of protection against unexpected movement of elevator cars. First, there is a lack of brake unit monitoring, which makes it impossible to verify that it operates normally and can generate sufficient torque to stop the car when UCM occurs, and it is impossible to ensure that each brake unit has sufficient torque to keep the empty car in its original position; there is a lack of brake action monitoring switch connected to the elevator's start-up permission circuit and monitor the brake falling, and it is impossible to manually test the single-sided brake regularly to ensure that the torque of the single-sided brake unit is sufficient to keep the empty car in its original position; second, if the car moves unexpectedly, the brake cannot stop the car; third, the detection of unexpected movement of the car when the door is open cannot be achieved by double-door zone monitoring, and the safety circuit cannot be cut off when the car accidentally slides out of the door zone; fourth, there is a lack of memory to record unexpected car movement (UCM). When the power is off, the memory cannot store UCM information, and the elevator cannot be kept in the out of service state until the memory is reset after the maintenance personnel check the system. It cannot meet the requirements of "Amendment No. 1" of the emergency start elevator safety standard GB7588-2003, cannot achieve protection against accidental movement of the car, cannot effectively prevent and reduce the occurrence of similar accidents, and cannot reduce elevator safety risks.

[0012] (3) The existing technology for retrofitting elevators cannot meet the requirements of the new standards. It is impossible to make the retrofitted elevator meet the new requirements of the elevator standards after replacing the electrical control cabinet while retaining the old motor. There is a lack of a car accidental movement protection device based on the actual situation of the retrofitted elevator and adapted to the needs of the retrofitted elevator. It cannot cooperate with the two-way speed limiter to realize the upward overspeed protection function. Due to the large limitations of the retrofitted elevator, the existing technology does not analyze the installation conditions of the car accidental movement protection device from the two aspects of door opening and brake, and does not clearly define the conditions for adding the car accidental movement protection device. There is a lack of car accidental movement protection device with brake stabilization device, lack of control system and control circuit, and it is impossible to lead the required detection signal from the original elevator electrical system and provide it to the logic unit to determine the time when the car accidental movement occurs to perform protection. The original elevator electrical system is greatly modified and cannot meet the requirements of the elevator standard and the modification list for car accidental movement protection. The retrofitted elevator cannot meet the new standards and inspection regulations, and cannot handle the car accidental movement failure in time, which is not conducive to ensuring the safety and stability of the elevator system. Summary of the invention

[0013] This application aims to add a car accidental movement protection device in response to the requirements of the new No. 1 amendment to the elevator standard, and establishes a method for implementing the car accidental movement protection with a braking stabilization device. First, it aims to control costs and establish a set of competitive car accidental movement protection devices to meet the increasingly obvious price competition needs in the modified elevator market and help promote modified elevator products to more projects; second, starting from analyzing the standards and the contents of the amendment, fully understand what kind of elevators need to be equipped with a car accidental movement protection device to avoid blind installation or wrong installation, adding unnecessary feedback components, and apply it according to actual conditions; third, the design is based on flexible installation as a prerequisite, and uses independent safety contacts and safety circuits to parallelly reference the door contact signal and the door zone signal to the independent car accidental movement protection logic unit, which does not affect the original elevator's electrical control system function and can increase the car accidental movement protection function. If the original elevator is already equipped with a two-way speed limiter, the switch for monitoring upward overspeed in the two-way speed limiter can be quickly connected to the independent protection logic unit for unexpected car movement, so that the independent protection device for unexpected car movement can simultaneously realize the protection functions of unexpected car movement and upward overspeed, making the system more integrated and further improving the competitiveness of the product; Fourth, the design takes into account the conditions of the modified elevator itself, and the electrical control system of the original elevator is minimally modified to facilitate the operation of on-site personnel. After testing the entire set of independent protection devices for unexpected car movement on the sample elevator, it fully meets the requirements of the standard and the first amendment for unexpected car movement protection.

[0014] In order to achieve the above technical effects, the technical solutions adopted in this application are as follows:

[0015] The new elevator standard transforms the independent protection system for unexpected car movement, establishes a system based on retaining the original traction machine, and only installs the device when transforming the elevator control system to achieve unexpected car movement protection, establishes a control system and control circuit, and analyzes that by adding an independent circuit, the required detection signal is drawn from the original elevator electrical system and provided to the logic unit to determine the moment when the unexpected car movement occurs and execute protection, while meeting the function and making the minimum change to the original elevator electrical system;

[0016] Establish the optimal control parameter model of independent protection against unexpected car movement, and optimize the braking stability independent protection control system against unexpected car movement, including the following parts:

[0017] 1) Detection device: Under the premise that the elevator door is not closed, the accidental movement of the car is detected by an electrical safety device that meets the standard requirements at the latest when the car leaves the door lock area;

[0018] 2) Logical judgment unit: performs logical analysis on the detected signals to determine whether the elevator is in the state of unexpected car movement, or is operating normally and opening the door in advance in the safety door area;

[0019] 3) Braking protection component: When the car is detected to move unexpectedly, the system will immediately issue a braking command to make the elevator stop urgently;

[0020] As the elevators being renovated or undergoing normal maintenance cannot be significantly modified, this set of car accidental movement protection device is installed after the elevator is debugged. The brake stabilization device is used as the stopping protection component. Its detection part replicates the door lock signal and door zone signal in the original elevator control system. When the logic judgment unit determines that the car has accidentally moved, the output side disconnects the brake stabilization device excitation coil power supply circuit, triggering the brake stabilization device to clamp the traction rope and stop the car. This design is independent of the original elevator electrical system and does not affect the logical control relationship of the original control system, thus realizing the car accidental movement protection.

[0021] Preferably, the brake stabilization car accidental movement independent protection control system comprises:

[0022] D1: Braking stabilization device;

[0023] D2: logic unit box;

[0024] D3: relay unit box;

[0025] D4: Door area signal conversion board;

[0026] D5: speed limiter;

[0027] D6: tensioning device;

[0028] If the braking stabilization device is required to be used as an elevator upward overspeed protection device in actual applications, the speed limiter is configured as a two-way speed limiter. When the elevator exceeds the speed limit, the two-way speed limiter switch is disconnected to trigger the braking stabilization device to stop the wire rope for protection. This compatible design meets the standard design requirements for independent protection devices for accidental movement of the car.

[0029] Preferably, the braking stabilizing device: The braking stabilizing device is installed on the traction frame between the traction wheel and the guide wheel in the machine room, or installed on the lower part of the guide wheel. The installation must be firm and reliable. When overspeed or accidental movement of the car occurs, the detection unit sends an electrical signal, the rope pressing block of the braking stabilizing device is actuated, and the traction wire rope is clamped to achieve braking;

[0030] The brake stabilization device is the actuator in the independent protection system for accidental movement of the entire car, including: dynamic brake plate, reset device, electromagnet, friction lining, customized dynamic plate, connecting arm, side plate, impact rod, lock hook, safety switch, spring, bracket;

[0031] When the elevator is operating normally, the traction wire rope pulls the car up and down between the dynamic brake plate and the custom dynamic brake plate. The gap between the custom dynamic brake plate and the traction rope is 1 to 2.5 mm, and the gap between the dynamic brake plate and the traction rope is larger. When upward overspeed or accidental movement of the car occurs, the reset device on the brake stabilization device disconnects the power supply of the electromagnet, the electromagnet loses power, the impact trigger mechanism opens the lock hook, and releases the two compression springs to generate a force. The dynamic brake plate is moved through the connecting rod mechanism to press the traction rope, and the braking force is directly applied to the traction wire rope. The dynamic brake plate, the custom dynamic brake plate, the friction lining and the traction rope are used to stop the car within a specified distance.

[0032] Preferably, the logic unit box: the logic unit box is provided with the following detection and control units: a. Detection of overspeed signal, door lock signal, door zone signal; b. Self-detection protection, input dual-channel self-detection, terminal detection; c. Determine the moment of upward overspeed or accidental movement of the car, and can instantly disconnect the braking stabilization device action circuit; d. Reset after the fault is eliminated to restore system service.

[0033] Preferably, the relay unit: the relay unit causes the armature to close according to the input signal, drives the contact to move, and connects or disconnects the control circuit. The relay unit group is provided with 6 safety relays, 1 power module and terminal block. Every 3 relays constitute a safety circuit. The car door contact signal and the floor door lock signal are respectively provided to the safety chain of the elevator control system and the logic circuit of the independent protection system for accidental movement of the car by the safety circuit composed of three relays.

[0034] Preferably, the door area signal conversion board: copies the door area signal from the original elevator control circuit through parallel flat cables, isolates the input and output circuits with optical coupling, and then outputs the signal to the independent protection system for accidental movement of the car. The conversion board is installed in the electrical cabinet without additional protection.

[0035] Preferably, the framework of the independent protection system for accidental movement of the car is as follows: the relay unit obtains the car door and floor door status signals of the original elevator, the signal conversion board picks up the door area signal of the original elevator through a flat cable, these door status signals and door area signals are provided to the logic unit box, the logic unit box itself is certified by a programmable electronic safety circuit, it receives the car door, floor door status signals and door area signals, and combines the car operation signal to determine whether the car has accidental movement, if the car moves unexpectedly, the power supply circuit of the brake stabilization device excitation coil is immediately disconnected, the brake stabilization device is actuated to clamp the traction rope and stop the car.

[0036] Preferably, the independent protection control method: when the landing door is not locked and the car door is not closed, the elevator is provided with a device to prevent the movement or stop the movement;

[0037] Assuming that the elevator car stops at the door area, the elevator car moves out of the door area when the floor door is not locked and the car door is not closed. At this time, the relay unit corresponds to the car door, hall door signal and the door area signal provided by the signal conversion board for the logic unit to determine whether the car has moved unexpectedly. Once it is determined that the car has moved unexpectedly, the power supply of the brake stabilization device coil is immediately disconnected, thereby quickly stopping the car and disconnecting the elevator safety circuit. The elevator is out of service and waits for personnel to repair the fault and resume elevator service.

[0038] Preferably, the car accident movement protection control circuit: the input part of the independent protection device for accidental car movement has a door area signal circuit and a car door and hall door lock signal circuit, the output is directly connected to the brake stabilization device excitation coil circuit by a safety contact, and the middle logic unit is a programmable electronic safety-related system PESSRAL circuit board. Each input signal of the door area signal, door lock signal, overspeed signal and operation signal enters the logic unit box controller, which is a dual-channel acquisition signal. The two signals are compared. If the two signals are found to be inconsistent, the input dual-channel fault is detected, and the logic unit box reports the fault to the elevator main controller through the fault relay. At the same time, the buzzer sounds, and the fault code is displayed on the control board. When the elevator enters the door area and there is no running signal, the door is opened for 6s, and the elevator safety circuit is disconnected, so that the elevator cannot start and the brake stabilization device will not be triggered. After receiving the fault signal, the elevator main controller will take action to prevent the elevator from starting next time.

[0039] Preferably, the car accidental movement protection control circuit comprises:

[0040] 1) Car door lock signal circuit: This circuit uses a safety relay independent of the original elevator to detect the floor and car door status. Every 3 relays detect one signal. There are six relays from K1 to K6 for the car door and floor door. K1 to K3 are for detecting the car door contact signal. When the car door is open and the car door contacts are not closed, the K1 to K3 relay coils are all powered, and the corresponding normally closed and normally open points do not act. When the car door is closed, K1 and K2 of the K3 coil are normally closed contacts. The K3 relay coil is first energized, the normally closed contact of K3 opens, and the normally open contact closes. The K1 and K2 coils are activated through the normally open contact of K3. The electric suction, the normally closed contacts of K1 and K2 are disconnected, the normally open contacts are closed, the normally closed contacts of K1 and K2 on the K3 coil circuit are disconnected, and the K3 coil is released due to power loss. At this time, the car door contact state feedback changes from the open state to the closed state, which is consistent with the car door state, ensuring the normal operation of the original elevator electrical system. At the same time, another circuit connected in series with the normally open contacts of K1 and K2 and the normally closed contacts of K3 is output to the independent protection logic control unit for accidental movement of the car, realizing the signal of the car door contact state and giving the elevator safety circuit to determine whether the elevator has the operating conditions, and giving the independent protection logic control unit for accidental movement of the car to determine the accidental movement of the car;

[0041] 2) Landing door lock signal circuit: The landing door lock status is provided to the original elevator control circuit through the three safety relays K4 to K6, and also to the independent protection logic control unit for accidental movement of the car;

[0042] 3) Door zone signal circuit: The double door zone signal is transmitted from the door zone sensor to the car top electrical box, and then transmitted to the original elevator control system through the accompanying cable. The signal is shared to the signal conversion board through the flat cable. The signal conversion board isolates the original elevator control system and the circuit board output circuit through the optical coupler, and independently provides the door zone signal to the independent protection logic control unit for accidental movement of the car;

[0043] Install two door zone photoelectric switches and compare them with each other for diagnosis; at the same time, compare the operation signal with the two door zone signals. If the comparison status is abnormal, it is determined that the door zone sensor is faulty.

[0044] When the elevator passes through the door area four times and the signal of one of the door areas does not change, a door area fault is detected. The MCU reports the fault to the elevator main controller through the fault relay. At the same time, the buzzer sounds and the fault code is displayed on the detection control panel. When the elevator enters the door area and there is no running signal, the door is opened for 6 seconds, the elevator safety circuit is disconnected, the brake stabilization device is triggered, and the elevator cannot start. After receiving the fault signal, the elevator main controller takes action to prevent the elevator from starting next time.

[0045] When the detection controller receives the running signal, and the two door zone signals do not change for 30 seconds, a door zone fault is detected. The MCU reports the fault to the elevator main controller through the fault relay, and the buzzer sounds at the same time. The fault code is displayed on the detection control board. When there is no running signal from the elevator and the door is opened for 6 seconds, the elevator safety circuit is disconnected and the brake stabilization device is triggered, so that the elevator cannot start. After receiving the fault signal, the elevator main controller takes action to prevent the elevator from starting next time.

[0046] When the detection controller does not receive the running signal, the two door zone signals change state after 4 times, and it is determined that the running signal is lost, then a door zone fault is detected, and the MCU reports the fault to the elevator main controller through the fault relay. At the same time, the buzzer sounds, and the fault code is displayed on the detection control board. After the elevator enters the door area and the door opens for 6 seconds, the elevator safety circuit is disconnected and the brake stabilization device is triggered, so that the elevator cannot start. After receiving the fault signal, the elevator main controller takes action to prevent the elevator from starting next time.

[0047] Compared with the prior art, the innovations and advantages of this application are:

[0048] (1) This application aims to add a car accidental movement protection device in response to the requirement of the new No. 1 amendment to the elevator standard, and establishes a car accidental movement protection implementation method with a brake stabilization device. First, it aims to control costs and establish a set of competitive car accidental movement protection devices to meet the increasingly obvious price competition needs in the modified elevator market and help promote modified elevator products to more projects; second, starting from analyzing the standards and the contents of the amendment, fully understand what kind of elevators need to be equipped with a car accidental movement protection device, avoid blind installation or wrong installation, add unnecessary feedback components, and apply it according to actual conditions; third, the design is based on flexible installation as a prerequisite, and uses independent safety contacts and safety circuits to parallelly reference the door contact signal and the door zone signal to the independent car accidental movement protection logic unit, which does not affect the original elevator's electrical control system function and can increase the car accidental movement protection function. If the original elevator is already equipped with a two-way speed limiter, the switch for monitoring upward overspeed in the two-way speed limiter can be quickly connected to the independent protection logic unit for unexpected car movement, so that the independent protection device for unexpected car movement can simultaneously realize the protection functions of unexpected car movement and upward overspeed, making the system more integrated and further improving the competitiveness of the product; Fourth, the design takes into account the conditions of the modified elevator itself, and the electrical control system of the original elevator is minimally modified to facilitate the operation of on-site personnel. After testing the entire set of independent protection devices for unexpected car movement on the sample elevator, it fully meets the requirements of the standard and the first amendment for unexpected car movement protection.

[0049] (2) This application designs a set of devices to realize the protection of car accidental movement based on retaining the original traction machine and only modifying the elevator control system. The interface interface of the new control system and this set of independent protection devices for accidental car movement and each signal are described in detail. Improve the relevant safety of the elevator brake system and door system, improve the performance failure of the elevator brake as the most important safety protection device in the elevator structure, design the elevator door as a protection device to prevent falling and shearing, when the elevator is in the leveling position and the door is open, avoid accidental movement of the car, ensure the safety of passengers, and establish a shear protection mode for the entrance of the hall door for the protection of accidental car movement. When the elevator is in the leveling position and the door is open, if the car moves unexpectedly, this protection function works, stops the elevator, and protects the safety of passengers. By adding an independent protection system for accidental car movement, the modified elevator can meet the requirements of the new elevator standards to the greatest extent on the one hand, and also increase the safety of the elevator on the other hand. When the old elevator is partially modified, a protection device is added on the basis of retaining the original elevator motor to realize the protection function of accidental car movement, timely handle the accidental car movement failure, and ensure the safety and stability of the old elevator system, which is of great value.

[0050] (3) This application timely and fully implements the requirements for protection against unexpected movement of the elevator car, and establishes four elements of protection against unexpected movement of the elevator car. The first is brake unit monitoring to verify that it operates normally and can generate sufficient torque to stop the car when UCM occurs, ensuring that each brake unit has sufficient torque to keep the empty car in its original position; the brake action monitoring switch is connected to the elevator's start-up permission circuit and monitors the brake falling, and the single-sided brake is manually tested regularly to ensure that the torque of the single-sided brake unit is sufficient to keep the empty car in its original position; second, if the car moves unexpectedly, the brake will stop the car in time; third, the detection of unexpected movement of the car when the door is open is achieved by double door zone monitoring, and the safety circuit is cut off when the car slides out of the door zone accidentally; fourth, the memory records the unexpected movement of the car (UCM). When the power is off, the memory cannot store UCM information, and the elevator is kept in the out of service state until the memory is reset after the maintenance personnel check the system. It meets the requirements of "Amendment No. 1" of the emergency start elevator safety standard GB7588-2003, realizes protection against accidental movement of the car, effectively prevents and reduces similar accidents of accidental movement of the car, and reduces elevator safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 The present invention discloses a system block diagram of a car accidental movement protection device.

[0052] Figure 2 It is a comparison chart of characteristic gas content at different superheat temperatures.

[0053] Figure 3 This is the structural diagram of the brake stabilization device modified according to the new standard for elevators.

[0054] Figure 4 It is the circuit diagram of the door area signal conversion board.

[0055] Figure 5 It is the car door lock signal duplication circuit diagram.

[0056] Figure 6 It is the gate area signal circuit diagram.

[0057] Figure 7 It is an independent protection test system for accidental car movement.

[0058] Figure 8 It is a schematic diagram of the car stopping distance.

[0059] Explanation of the reference numerals: 1-brake stabilization device, 2-logic unit box, 3-relay unit box, 4-door area signal conversion board, 5-speed limiter, 6-tensioning device, 11-dynamic brake plate, 12-reset device, 13-electromagnet, 14-friction lining, 15-custom brake plate, 16-connecting arm, 17-side plate, 18-impact rod, 19-lock hook, 20-safety switch, 21-spring, 22-bracket. DETAILED DESCRIPTION

[0060] The following, in conjunction with the accompanying drawings, further describes the technical solution of the new standard for the elevator car accidental movement independent protection system provided by the present application, so that technicians in this field can better understand the present application and implement it.

[0061] According to the latest revision No. 1 of the elevator standard, elevators need to meet the requirements for accidental movement protection of the car. All elevator manufacturers have taken prompt action to study the content of the standard and make newly shipped elevators meet the new standard requirements as soon as possible and pass the inspection and testing. The modified elevator market also needs to meet the requirements of the new standard. How to make the modified elevator meet the new requirements of the elevator standard after replacing the electrical control cabinet while retaining the old motor? This product demand has not received widespread attention from elevator companies because the modified elevator market is still in a slow growth stage. This application is based on the actual situation of modified elevators and designs a set of accidental movement protection devices for the car that meet the needs of modified elevators.

[0062] The car accidental movement protection device in this application can also cooperate with the two-way speed limiter to realize the upward overspeed protection function. Such a design makes the entire elevator system more integrated. The contents of the elevator standard GB7588 and the No. 1 amendment are analyzed to decompose the implementation elements of the elevator car accidental movement protection, identify the differences between modified elevators and new elevators, and the limitations of modified elevators, provide the prerequisites for the design of the car accidental movement protection device in this application, and then analyze the installation conditions of the car accidental movement protection device from the two aspects of door opening and brakes, and clarify the conditions for adding the car accidental movement protection device.

[0063] Construct a car accidental movement protection device with a braking stabilization device, establish a control system and control circuit, and analyze that by adding an independent circuit, the required detection signal is derived from the original elevator electrical system and provided to the logic unit to determine the moment when the car accidental movement occurs and execute protection. This design scheme takes into account the functional requirements while minimizing the changes to the original elevator electrical system.

[0064] An optimal control parameter model for independent protection against accidental car movement is established. By recording various test results such as system reaction time and action distance when the car moves unexpectedly, and comparing with the specific requirements in the standard, it is proved that the accidental car movement protection scheme designed in this application meets the elevator standards and the requirements of the modification sheet for accidental car movement protection. During or after the elevator renovation, this independent design scheme can be installed to make the renovated elevator meet the new standards and inspection regulations, thus filling the market gap.

[0065] 1. Braking stability and independent protection control system for accidental car movement

[0066] The system block diagram of this car accidental movement protection device is shown in Figure 1 , including the following parts:

[0067] 1) Detection device: Under the premise that the elevator door is not closed, the accidental movement of the car is detected by an electrical safety device that meets the standard requirements at the latest when the car leaves the door lock area;

[0068] 2) Logical judgment unit: performs logical analysis on the detected signals to determine whether the elevator is in the state of unexpected car movement, or is operating normally and opening the door in advance in the safety door area;

[0069] 3) Braking protection component: When the car is detected to move unexpectedly, the system will immediately issue a braking command to make the elevator stop urgently;

[0070] Since the elevators being renovated or undergoing normal maintenance cannot be significantly modified, this set of car accidental movement protection device is installed after the elevator is debugged. The brake stabilization device is used as the stopping protection component. Its detection part replicates the door lock signal and door zone signal in the original control system of the elevator. When the logic judgment unit determines that the car has accidentally moved, the output side disconnects the power supply circuit of the brake stabilization device excitation coil, triggering the brake stabilization device to clamp the traction rope and stop the car. This design is independent of the original elevator electrical system, does not affect the logical control relationship of the original control system, and can achieve protection against accidental car movement.

[0071] (I) System composition

[0072] The overall structure of the car accidental movement protection device is as follows Figure 2 ,include:

[0073] D1: Braking stabilization device 1;

[0074] D2: logic unit box 2;

[0075] D3: relay unit box 3;

[0076] D4: Door zone signal conversion board 4 (installed in the control cabinet);

[0077] D5: speed limiter 5;

[0078] D6: tensioning device 6;

[0079] If the brake stabilization device is required to be used as an elevator upward overspeed protection device in actual applications, the speed limiter is configured as a two-way speed limiter. When the elevator exceeds the speed limit, the two-way speed limiter switch is disconnected, the brake stabilization device is triggered, and the wire rope is stopped to achieve protection. This compatible design meets the standard's design requirements for independent protection devices for accidental car movement.

[0080] 1) Brake stabilization device

[0081] The brake stabilizer 1 is installed on the traction frame between the traction wheel and the guide wheel in the machine room, or installed on the lower part of the guide wheel. It must be installed firmly and reliably. When overspeed or accidental movement of the car occurs, the detection unit sends an electrical signal, the brake stabilizer rope pressure block is activated, and the traction wire rope is clamped to achieve braking. Figure 3 This is the structural diagram of the brake stabilization device.

[0082] The brake stabilization device 1 is an actuator in the entire car accidental movement independent protection system, including: a dynamic brake plate 11, a reset device 12, an electromagnet 13, a friction lining 14, a custom dynamic plate 15, a connecting arm 16, a side plate 17, an impact rod 18, a lock hook 19, a safety switch 20, a spring 21, and a bracket 22;

[0083] When the elevator is operating normally, the traction wire rope pulls the car up and down between the dynamic brake plate 11 and the custom brake plate 15. The gap between the custom brake plate 15 and the traction rope is 1 to 2.5 mm, and the gap between the dynamic brake plate 15 and the traction rope is larger. When upward overspeed or accidental movement of the car occurs, the reset device 12 on the brake stabilization device disconnects the power supply of the electromagnet, the electromagnet loses power, the impact trigger mechanism opens the lock hook, and releases the two compression springs to generate a force. The dynamic brake plate is moved through the connecting rod mechanism to press the traction rope, and the braking force is directly applied to the traction wire rope. The dynamic brake plate 11 and the custom brake plate 15 and the friction lining 14 and the traction rope are used to stop the car within a specified distance.

[0084] 2) Logic unit box

[0085] The logic unit box is equipped with the following detection and control units: a. Detection of overspeed signal, door lock signal, door zone signal; b. Self-test protection, input dual-channel self-test, terminal detection; c. Identification of the moment when upward overspeed or unexpected movement of the car occurs, and the braking stabilization device action circuit can be instantly disconnected; d. Reset after the fault is eliminated to restore system service;

[0086] 3) Relay unit

[0087] According to the input signal, the relay unit causes the armature to close and drive the contacts to connect or disconnect the control circuit. The relay unit group is equipped with 6 safety relays, 1 power module and terminal block. Every 3 relays constitute a safety circuit. The car door contact signal and floor door lock signal are provided to the safety chain of the elevator control system and the independent protection system logic circuit of accidental car movement by the safety circuit composed of three relays.

[0088] 4) Door area signal conversion board

[0089] Figure 4This is the circuit diagram of the door area signal conversion board. The door area signal is copied from the original elevator control circuit through parallel flat cables. The optical coupler isolates the input and output circuits, and then outputs the signal to the independent protection system for accidental movement of the car. The conversion board is installed in the electrical cabinet and no additional protection is required.

[0090] (II) Independent protection control system for accidental car movement

[0091] 1. Independent protection system framework for accidental car movement

[0092] The relay unit obtains the status signals of the original elevator's car door and floor door, and the signal conversion board picks up the original elevator door area signal through a flat cable. These door status signals and door area signals are provided to the logic unit box, which itself is certified by a programmable electronic safety circuit. When it receives the car door, floor door status signals and door area signals, it combines the car operation signal to determine whether the car has unexpected movement. If the car moves unexpectedly, the power supply circuit of the brake stabilization device excitation coil is immediately disconnected, and the brake stabilization device clamps the traction rope to stop the car.

[0093] 2. Independent protection control method

[0094] When the landing door is not locked and the car door is not closed, the elevator is equipped with a device to prevent or stop the unexpected movement of the car away from the landing due to the failure of any single component of the drive host or drive control system on which the safe operation of the car depends;

[0095] Assuming that the elevator car stops at the door area, due to brake failure or unknown reasons, the elevator car moves out of the door area when the floor door is not locked and the car door is not closed. At this time, the relay unit corresponds to the car door, hall door signal and the door area signal provided by the signal conversion board for the logic unit to determine whether the car has moved unexpectedly. Once it is determined that the car has moved unexpectedly, the power supply of the brake stabilization device coil is immediately disconnected, thereby quickly stopping the car, and disconnecting the elevator safety circuit. The elevator is out of service and waits for personnel to repair the fault and resume elevator service.

[0096] (III) Car accidental movement protection control circuit

[0097] The input part of the independent protection device for accidental movement of the car includes the door area signal circuit and the car door and hall door lock signal circuit. The output is directly connected to the brake stabilization device excitation coil circuit by the safety contact. The middle logic unit is a programmable electronic safety-related system PESSRAL circuit board. Each input signal of the door area signal, door lock signal, overspeed signal and operation signal enters the logic unit box controller. They are all dual-channel acquisition signals (two-way redundant design). The two signals are compared. If the two signals are found to be inconsistent, the input dual-channel fault is detected. The logic unit box reports the fault to the elevator main controller through the fault relay, and the buzzer sounds at the same time. The fault code is displayed on the control board. When the elevator enters the door area and there is no running signal, the door is opened for 6s, and the elevator safety circuit is disconnected, so that the elevator cannot start and the brake stabilization device will not be triggered. After receiving the fault signal, the elevator main controller will process it to prevent the elevator from starting next time.

[0098] 1. Car door lock signal circuit

[0099] Figure 5 It is a car door lock signal replication circuit. This circuit uses a safety relay independent of the original elevator to detect the floor and car door status. Every 3 relays detect one signal. There are six relays from K1 to K6 for the car door and floor door. K1 to K3 are for detecting the car door contact signal. When the car door is open and the car door contact is not closed, the K1 to K3 relay coils are all powered, and the corresponding normally closed and normally open points do not act. When the car door is closed, K1 and K2 of the K3 coil are normally closed contacts. The K3 relay coil is first energized, the normally closed contact of K3 opens, and the normally open contact closes. The K1 and K2 coils are activated through the normally open contact of K3. When energized, the normally closed contacts of K1 and K2 are disconnected, and the normally open contacts are closed. The normally closed contacts of K1 and K2 on the K3 coil circuit are disconnected, and the K3 coil is released when power is lost. At this time, the car door contact state feedback changes from open to closed, which is consistent with the car door state, ensuring the normal operation of the original elevator electrical system. At the same time, another circuit connected in series with the normally open contacts of K1 and K2 and the normally closed contacts of K3 is output to the independent protection logic control unit for accidental movement of the car, realizing the signal of the car door contact state and giving the elevator safety circuit to determine whether the elevator has the operating conditions, and giving the independent protection logic control unit for accidental movement of the car to determine the accidental movement of the car.

[0100] 2. Landing door lock signal circuit

[0101] The three safety relays K4 to K6 provide the landing door lock status to the original elevator control circuit and also to the independent protection logic control unit for accidental car movement.

[0102] 3. Door zone signal circuit

[0103] like Figure 6The double door zone signal is transmitted by the door zone sensor to the car top electrical box, and then transmitted to the original elevator control system through the accompanying cable. The signal is shared to the signal conversion board through the flat cable. The signal conversion board isolates the original elevator control system and the circuit board output circuit through the optical coupler, and independently provides the door zone signal to the independent protection logic control unit for accidental movement of the car.

[0104] Install two door zone photoelectric switches and compare them with each other for diagnosis; at the same time, compare the operating signal with the two door zone signals. When the comparison status is found to be abnormal, it is determined that the door zone sensor (or operating signal) is faulty.

[0105] When the elevator passes through the door area four times and the signal of one of the door areas does not change, a door area fault is detected. The MCU reports the fault to the elevator main controller through the fault relay. At the same time, the buzzer sounds and the fault code is displayed on the detection control panel. When the elevator enters the door area and there is no running signal, the door is opened for 6 seconds, the elevator safety circuit is disconnected, the brake stabilization device is triggered, and the elevator cannot start. After receiving the fault signal, the elevator main controller takes action to prevent the elevator from starting next time.

[0106] When the detection controller receives the running signal, if the two door zone signals do not change for 30 seconds, a door zone fault is detected, and the MCU reports the fault to the elevator main controller through the fault relay. At the same time, the buzzer sounds and the fault code is displayed on the detection control board. When there is no running signal from the elevator and the door is opened for 6 seconds, the elevator safety circuit is disconnected and the brake stabilization device is triggered, so that the elevator cannot start. After receiving the fault signal, the elevator main controller takes action to prevent the elevator from starting next time.

[0107] When the detection controller does not receive the running signal, the two door zone signals change state after 4 times, and it is determined that the running signal is lost, then the door zone fault is detected, and the MCU reports the fault to the elevator main controller through the fault relay. At the same time, the buzzer sounds, and the fault code is displayed on the detection control board. After the elevator enters the door area and the door is opened for 6 seconds, the elevator safety circuit is disconnected, the brake stabilization device is triggered, and the elevator cannot start. After the elevator main controller receives the fault signal, it takes action to prevent the elevator from starting next time.

[0108] This application constructs the subsystems of the car accidental movement protection device and establishes a method for later installation of an independent car accidental movement protection device, which does not affect the original control system of the elevator and is convenient for installing the device in the elevator renovation market to meet the requirements of the new national standard.

[0109] 2. Optimal control parameter model for independent protection of car accidental movement

[0110] Before the entire set of independent protection device for accidental car movement is put into mass production, it is necessary to carry out various control circuit function tests and parameter settings on the model elevator to ensure the normal operation of the equipment.

[0111] This model is based on the requirements of the latest elevator type model rules Annex T, designed test and data sampling circuits, and built a test platform. Figure 7 For this test system, the sampling equipment will monitor the two door zone signals and the brake stabilization device coil power supply, compare the collected data and test results with the specific requirements of the model rules, analyze whether the system response is as expected, and determine whether the entire car accidental movement independent protection system can meet the requirements of car accidental movement protection.

[0112] (I) Experimental results

[0113] 1.K1 to K6 relay simulated failure test

[0114] By adding additional switch groups to simulate the adhesion and trigger failure models of K1 to K6 relays, all test results are consistent with expectations. When any relay from K1 to K6 fails, the elevator cannot start, ensuring that the installation of this independent protection device for accidental car movement will not reduce the safety factor of the original elevator control system.

[0115] 2. Door zone signal failure simulation test

[0116] Similarly, by adding an additional switch group to simulate the failure of the door zone signal, the independent protection logic control unit for unexpected car movement can identify this failure and report the corresponding fault light. The elevator stops at the level position and cannot be started.

[0117] 3. Independent protection test for accidental car movement

[0118] Modify the following requirements for the car stopping distance after an unexpected car movement occurs:

[0119] a) The distance from the landing where the car unexpectedly moves is detected is not more than 1.20m;

[0120] b) The vertical distance between the floor door sill and the lowest part of the car footboard shall not exceed 0.20m;

[0121] c) When the hoistway enclosure is set according to the standard requirements, the distance between the car sill and the lowest part of the hoistway wall facing the car entrance shall not exceed 0.20m;

[0122] d) The vertical distance between the car sill and the floor door lintel or between the floor door sill and the car lintel shall not be less than 1.00m.

[0123] refer to Figure 8 The illustration shows that the requirements shall be met when the car is loaded with any load not exceeding 100% of the rated load and moves from rest at the leveling position;

[0124] At the same time, the independent protection device for accidental car movement should also ensure that after detecting the accidental car movement, the deceleration of the car should not exceed the following requirements:

[0125] 1) 1gn when the empty car moves upward unexpectedly;

[0126] 2) In case of unexpected downward movement, the deceleration allowed when the free fall protection device is activated.

[0127] Build the test system according to the experimental plan, keep the car door open, and manually release the traction machine brake to move the car. Monitor and record the reaction time and stopping distance of the UCMP system designed in this paper when the car moves unexpectedly.

[0128] When one of the two door zone signals flips, it means that the elevator car leaves the door zone, the door opens, the door lock signal is disconnected, and the car accidental movement independent protection system determines that the car has moved unexpectedly, triggering the brake stabilization device. According to the test data results, the car accidental movement independent protection device can monitor the car accidental movement and disconnect the brake stabilization device coil power supply, triggering the brake stabilization device to stop the car, and the stopping distance meets the standard requirement of less than 1 meter. The experiment passed.

[0129] This application is based on the requirements of the new inspection regulations. The independent protection function and safety of the entire car accidental movement are tested on the constructed sample elevator. All test results meet the standard requirements and have obtained the certificate from the elevator inspection agency, meeting the conditions for application and market launch.

Claims

1. The new elevator standard transforms the independent protection system for accidental movement of the elevator car, which is characterized by: Establish a system based on retaining the original traction machine, and only modify the elevator control system to install a device to achieve accidental car movement protection, establish a control system and control circuit, analyze and add an independent circuit to lead the required detection signal from the original elevator electrical system, and provide it to the logic unit to determine the moment when the car moves unexpectedly, and execute protection, while meeting the function and making the minimum change to the original elevator electrical system; Establish the optimal control parameter model of independent protection against unexpected car movement, and optimize the braking stability independent protection control system against unexpected car movement, including the following parts: 1) Detection device: Under the premise that the elevator door is not closed, the accidental movement of the car is detected by an electrical safety device that meets the standard requirements at the latest when the car leaves the door lock area; 2) Logical judgment unit: performs logical analysis on the detected signals to determine whether the elevator is in the state of unexpected car movement, or is operating normally and opening the door in advance in the safety door area; 3) Braking protection component: When the car is detected to move unexpectedly, the system will immediately issue a braking command to make the elevator stop urgently; As the elevators being renovated or undergoing normal maintenance cannot be significantly modified, this set of car accidental movement protection device is installed after the elevator is debugged. The brake stabilization device is used as the stopping protection component. Its detection part replicates the door lock signal and door zone signal in the original elevator control system. When the logic judgment unit determines that the car has accidentally moved, the output side disconnects the brake stabilization device excitation coil power supply circuit, triggering the brake stabilization device to clamp the traction rope and stop the car. This design is independent of the original elevator electrical system and does not affect the logical control relationship of the original control system, thus realizing the car accidental movement protection.

2. According to the new standard of elevator car accidental movement independent protection system modified according to claim 1, it is characterized in that: The brake stabilizes the car from unexpected movement and the independent protection control system consists of: D1: Brake stabilization device (1); D2: logic unit box (2); D3: relay unit box (3); D4: Door zone signal conversion board (4); D5: speed limiter (5); D6: tensioning device (6); If the braking stabilization device is required to be used as an elevator upward overspeed protection device in actual applications, the speed limiter is configured as a two-way speed limiter. When the elevator exceeds the speed limit, the two-way speed limiter switch is disconnected to trigger the braking stabilization device to stop the wire rope for protection. This compatible design meets the standard design requirements for independent protection devices for accidental movement of the car.

3. The new standard elevator car accidental movement independent protection system according to claim 2 is characterized in that: Braking stabilization device: The braking stabilization device (1) is installed on the traction frame between the traction wheel and the guide wheel in the machine room, or installed under the guide wheel. It must be installed firmly and reliably. When overspeed or accidental movement of the car occurs, the detection unit sends an electrical signal, the braking stabilization device rope pressing block is activated, and the traction wire rope is clamped to achieve braking; The brake stabilization device (1) is an actuator in the entire car accidental movement independent protection system, comprising: a dynamic brake plate (11), a reset device (12), an electromagnet (13), a friction lining (14), a custom brake plate (15), a connecting arm (16), a side plate (17), an impact rod (18), a lock hook (19), a safety switch (20), a spring (21), and a bracket (22); When the elevator is running normally, the traction steel wire rope pulls the car up and down between the dynamic brake plate (11) and the custom brake plate (15). The gap between the custom brake plate (15) and the traction rope is 1 to 2.5 mm, and the gap between the dynamic brake plate (15) and the traction rope is larger. When upward overspeed or accidental movement of the car occurs, the reset device (12) on the brake stabilization device disconnects the power supply of the electromagnet, the electromagnet loses power, the impact trigger mechanism opens the lock hook, and the two compression springs are released to generate a force, and the dynamic brake plate is moved to press the traction rope through the connecting rod mechanism, and the braking force is directly applied to the traction steel wire rope. The dynamic brake plate (11) and the custom brake plate (15) and the friction lining (14) and the traction rope are used to stop the car within a specified distance.

4. According to the new standard of elevator car accidental movement independent protection system modified according to claim 2, it is characterized in that: Logic unit box: The logic unit box is equipped with the following detection and control units: a. Detection of overspeed signal, door lock signal, door zone signal; b. Self-test protection, input dual-channel self-test, terminal detection; c. Identify the moment when upward overspeed or unexpected movement of the car occurs, and can instantly disconnect the brake stabilization device action circuit; d. After the fault is eliminated, reset and restore system service.

5. According to the new standard of elevator car accidental movement independent protection system modified according to claim 2, it is characterized by: Relay unit: The relay unit closes the armature according to the input signal, drives the contact to connect or disconnect the control circuit. The relay unit group is equipped with 6 safety relays, 1 power module and terminal block. Every 3 relays constitute a safety circuit. The car door contact signal and the floor door lock signal are provided to the safety chain of the elevator control system and the independent protection system logic circuit of the accidental movement of the car by the safety circuit composed of three relays.

6. The new standard elevator car accidental movement independent protection system according to claim 2 is characterized in that: Door area signal conversion board: The door area signal is copied from the original elevator control circuit through parallel flat cables. The optical coupler isolates the input and output circuits, and then outputs the signal to the independent protection system for accidental movement of the car. The conversion board is installed in the electrical cabinet and no additional protection is required.

7. The new standard elevator car accidental movement independent protection system according to claim 1 is characterized in that: Framework of independent protection system for accidental car movement: the relay unit obtains the car door and floor door status signals of the original elevator, and the signal conversion board picks up the door area signal of the original elevator through the flat cable. These door status signals and door area signals are provided to the logic unit box. The logic unit box itself is certified by the programmable electronic safety circuit. It receives the car door, floor door status signals and door area signals, and combines them with the car operation signal to determine whether the car has accidental movement. If the car moves unexpectedly, the power supply circuit of the brake stabilization device excitation coil is immediately disconnected, and the brake stabilization device clamps the traction rope to stop the car.

8. The elevator car accidental movement independent protection system according to the new standard modification of claim 1 is characterized in that: Independent protection control method: When the landing door is not locked and the car door is not closed, the elevator is equipped with a device to prevent the movement or stop the movement; Assuming that the elevator car stops at the door area, the elevator car moves out of the door area when the floor door is not locked and the car door is not closed. At this time, the relay unit corresponds to the car door, hall door signal and the door area signal provided by the signal conversion board for the logic unit to determine whether the car has moved unexpectedly. Once it is determined that the car has moved unexpectedly, the power supply of the brake stabilization device coil is immediately disconnected, thereby quickly stopping the car and disconnecting the elevator safety circuit. The elevator is out of service and waits for personnel to repair the fault and resume elevator service.

9. The elevator car accidental movement independent protection system according to the new standard modification of claim 1 is characterized in that: Car accidental movement protection control circuit: The input part of the independent protection device for car accidental movement includes door area signal circuit and car door and hall door lock signal circuit. The output is directly connected to the brake stabilization device excitation coil circuit by the safety contact. The middle logic unit is a programmable electronic safety-related system PESSRAL circuit board. Each input signal of the door area signal, door lock signal, overspeed signal and running signal enters the logic unit box controller. They are all dual-channel acquisition signals. The two signals are compared. If the two signals are found to be inconsistent, the input dual-channel fault is detected. The logic unit box reports the fault to the elevator main controller through the fault relay. At the same time, the buzzer sounds and the fault code is displayed on the control board. When the elevator enters the door area and there is no running signal, the door is opened for 6s, and the elevator safety circuit is disconnected, so that the elevator cannot start and the brake stabilization device will not be triggered. After receiving the fault signal, the elevator main controller will process it to prevent the elevator from starting next time.

10. The elevator car accidental movement independent protection system according to the new standard modification of claim 1 is characterized in that: The car accidental movement protection control circuit includes: 1) Car door lock signal circuit: This circuit uses a safety relay independent of the original elevator to detect the floor and car door status. Every 3 relays detect one signal. There are six relays from K1 to K6 for the car door and floor door. K1 to K3 are for detecting the car door contact signal. When the car door is open and the car door contacts are not closed, the K1 to K3 relay coils are all powered, and the corresponding normally closed and normally open points do not act. When the car door is closed, K1 and K2 of the K3 coil are normally closed contacts. The K3 relay coil is first energized, the normally closed contact of K3 opens, and the normally open contact closes. The K1 and K2 coils are activated through the normally open contact of K3. The electric suction, the normally closed contacts of K1 and K2 are disconnected, the normally open contacts are closed, the normally closed contacts of K1 and K2 on the K3 coil circuit are disconnected, and the K3 coil is released due to power loss. At this time, the car door contact state feedback changes from the open state to the closed state, which is consistent with the car door state, ensuring the normal operation of the original elevator electrical system. At the same time, another circuit connected in series with the normally open contacts of K1 and K2 and the normally closed contacts of K3 is output to the independent protection logic control unit for accidental movement of the car, realizing the signal of the car door contact state and giving the elevator safety circuit to determine whether the elevator has the operating conditions, and giving the independent protection logic control unit for accidental movement of the car to determine the accidental movement of the car; 2) Landing door lock signal circuit: The landing door lock status is provided to the original elevator control circuit through the three safety relays K4 to K6, and also to the independent protection logic control unit for accidental movement of the car; 3) Door zone signal circuit: The double door zone signal is transmitted from the door zone sensor to the car top electrical box, and then transmitted to the original elevator control system through the accompanying cable. The signal is shared to the signal conversion board through the flat cable. The signal conversion board isolates the original elevator control system and the circuit board output circuit through the optical coupler, and independently provides the door zone signal to the independent protection logic control unit for accidental movement of the car; Install two door zone photoelectric switches and compare them with each other for diagnosis; at the same time, compare the operation signal with the two door zone signals. If the comparison status is abnormal, it is determined that the door zone sensor is faulty. When the elevator passes through the door area four times and the signal of one of the door areas does not change, a door area fault is detected. The MCU reports the fault to the elevator main controller through the fault relay. At the same time, the buzzer sounds and the fault code is displayed on the detection control panel. When the elevator enters the door area and there is no running signal, the door is opened for 6 seconds, the elevator safety circuit is disconnected, the brake stabilization device is triggered, and the elevator cannot start. After receiving the fault signal, the elevator main controller takes action to prevent the elevator from starting next time. When the detection controller receives the running signal, and the two door zone signals do not change for 30 seconds, a door zone fault is detected. The MCU reports the fault to the elevator main controller through the fault relay, and the buzzer sounds at the same time. The fault code is displayed on the detection control board. When there is no running signal from the elevator and the door is opened for 6 seconds, the elevator safety circuit is disconnected and the brake stabilization device is triggered, so that the elevator cannot start. After receiving the fault signal, the elevator main controller takes action to prevent the elevator from starting next time. When the detection controller does not receive the running signal, the two door zone signals change state after 4 times, and it is determined that the running signal is lost, then a door zone fault is detected, and the MCU reports the fault to the elevator main controller through the fault relay. At the same time, the buzzer sounds, and the fault code is displayed on the detection control board. After the elevator enters the door area and the door opens for 6 seconds, the elevator safety circuit is disconnected and the brake stabilization device is triggered, so that the elevator cannot start. After receiving the fault signal, the elevator main controller takes action to prevent the elevator from starting next time.

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