Elevator trapped person self-rescue device and method based on synchronous gearless traction machine
Through the self-rescue device for trapping people in the elevator based on a synchronous gearless traction machine, the elevator is quickly shut down by using the Star Emergency Level Controller and the Gate Holding Device. Combined with the networked rescue terminal and camera, the inaccurate stopping and rescue of elevator trapping people in the event of a trapping people in the elevator is solved. The problem of inefficiency achieves a safer and more convenient passenger experience and efficient fault diagnosis.
Patent Information
- Application Number
- CN202411110797.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2024-12-27
AI Technical Summary
When the elevator breaks down, it is difficult for the existing technology to quickly park the elevator on the nearest level, causing passengers to be anxious and nervous, and the rescue and maintenance efficiency are not high.
Adopt the self-rescue device for trapped people based on synchronous gearless traction machines, including car, synchronous gearless traction machines, brake holders, control systems, star-seal emergency level controller, networked rescue terminal, computer room control cabinet and computer room camera , through the Star Emergency Level Controller and the Brake Holding Device, the elevator can be quickly shut down, and passengers can communicate with the rescue center through the networked terminal, and the control system monitors the elevator status and diagnoses faults in real time.
It realizes rapid parking of elevators, reduces passenger injuries, improves rescue efficiency and maintenance efficiency, provides a safer and more convenient user experience, and enhances the safety and fault diagnosis functions of elevators.
Smart Images
Figure CN119191012A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of elevator self-rescue, and in particular to an elevator trapped person self-rescue device and method based on a synchronous gearless traction machine. Background Art
[0002] As a means of vertical transportation in modern society, elevators have increasingly entered people's daily lives and are widely used in airports, stations, docks, shopping malls, office buildings, high-rise residential buildings, and family homes. They have become an indispensable vertical transportation equipment in buildings. However, with the increase in the number of elevators, the uneven quality of elevators, the inadequate and irregular daily maintenance of elevators, and the irregular use of elevators by passengers have led to frequent elevator entrapment failures. After an elevator entrapment failure occurs, rescue is urgent.
[0003] The current rescue method is to send an alarm to the rescue platform through a mobile app, WeChat applet, or alarm button, alarm phone, or QR code in the elevator. The platform will issue a rescue instruction to the maintenance company based on the alarm information and implement the rescue.
[0004] Although this method improves the rescue efficiency of the elevator, it is difficult to quickly stop the elevator at the nearest level to avoid the anxiety and tension of passengers when they are trapped; Summary of the invention
[0005] The present application provides an elevator trapped person self-rescue device and method based on a synchronous gearless traction machine, which provides a safer and more convenient use experience and provides self-rescue and fault diagnosis functions.
[0006] The present application provides an elevator trapped person self-rescue device and method based on a synchronous gearless traction machine, which adopts the following technical solutions:
[0007] A self-rescue device and method for people trapped in an elevator based on a synchronous gearless traction machine, the self-rescue device for people trapped in an elevator based on a gearless traction machine comprises a car, a synchronous gearless traction machine, a brake, a control system, a star-sealing emergency leveling controller, a counterweight, a networked rescue terminal, a machine room control cabinet, a machine room and a machine room camera arranged in the machine room, a traction rope is provided on the top of the car, one end of the traction rope is connected to the car, and the other end of the traction rope passes through the synchronous gearless traction machine, the brake and is connected to the counterweight in sequence.
[0008] By adopting the above technical scheme, the elevator can be quickly stopped at the nearest level through the star-sealing emergency leveling controller and the braking device to prevent passengers from further harm; and the passengers can communicate with the rescue center through the networked rescue terminal to obtain timely help and guidance, which increases the self-rescue ability in the event of entrapment; and the control system can monitor the operating status of the elevator in real time. Once a fault occurs, it can accurately determine the type of fault and promptly notify maintenance personnel to repair it, thereby improving maintenance efficiency; in general, the elevator trapped self-rescue device based on the gearless traction machine improves the safety of the elevator through various measures, provides passengers with a safer and more convenient use experience, and provides self-rescue and fault diagnosis functions.
[0009] Preferably, a camera is provided inside the car for monitoring the internal situation of the car and providing a video signal.
[0010] By adopting the above technical solution, the camera can monitor the situation inside the elevator in real time, including passengers and items; this can provide security, timely monitor and prevent bad behavior, and ensure the safety of passengers in the elevator; the camera can record the situation inside the machine room equipment and the elevator, including the process of sudden incidents, such as falls, sudden power outages, etc.; this record can help relevant personnel to investigate and deal with the incident afterwards, and find out the cause and responsibility of the incident; in the event of entrapment, the camera can provide real-time images and conditions of the passengers, helping rescuers to better understand the situation and guide the rescue process; the camera can help maintenance personnel perform technical maintenance and troubleshooting of the elevator; by observing the camera images in real time, maintenance personnel can more accurately judge the problems inside the elevator and make corresponding repairs and adjustments.
[0011] Preferably, it also includes a mobile phone and an Internet of Things rescue terminal, the signal output end of the camera is connected to the input end of the Internet of Things rescue terminal, and the output end of the Internet of Things rescue terminal is connected to the signal input end of the mobile phone of the rescuer.
[0012] By adopting the above technical solution, the camera needs to be able to capture the image inside the car and the rescue action status in the machine room so that the rescue personnel can understand the situation of the trapped person and provide corresponding guidance. As the core rescue equipment, the IoT rescue terminal has voice and video acquisition functions and can receive and send rescue information. It needs to have sound and video sensors to collect voice and video signals in the car and convert them into text prompts or push them to relevant rescue personnel. The mobile phones of property or maintenance personnel serve as terminals for receiving rescue information. They can receive pushed rescue information and rush to the scene for rescue in time.
[0013] Preferably, a playback device is provided inside the car, and an input end of the playback device is connected to an output end of the Internet of Things rescue terminal.
[0014] By adopting the above technical solution, the playback device is used to play videos and music that relieve tension, thereby helping trapped passengers relieve tension; the playback device can be a function built into the IoT rescue terminal, or it can be an independent audio and video playback device.
[0015] Preferably, a temperature sensor, a human infrared sensor and a gravity acceleration sensor are provided inside the car.
[0016] By adopting the above technical solution, more comprehensive monitoring information of the temperature in the trapped environment can be provided.
[0017] Preferably, an oxygen concentration sensor is provided inside the car.
[0018] By adopting the above technical solution, more comprehensive monitoring information of oxygen concentration in trapped environment can be provided.
[0019] Preferably, the self-rescue method of the elevator trapped person self-rescue device based on the gearless traction machine, the rescue steps include:
[0020] S1: When a problem occurs in the car, the car sends a self-rescue command to the star-sealing emergency platform controller, and sends it to the synchronous traction machine through the switch command;
[0021] S2: The emergency platform controller controls and cuts off the safety circuit of the control system or the main power supply circuit; at the same time, it plays a pre-made voice to help calm the system. After reaching the door area, it supplies power to open the door, and after leaving the car, it cuts off power and waits for maintenance;
[0022] S3: The star-sealing emergency platform controller controls the car and makes the car slide to the leveling position in the heavy-load direction.
[0023] By adopting the above technical solution, the Fengxing emergency platform controller controls the disconnection and reconnection of the elevator system's safety circuit or power supply main circuit, and cuts off the power after the passengers leave to ensure safety and provide preparation for maintenance. This can enhance safety, prompt passengers to evacuate quickly, and make maintenance ready.
[0024] In summary, this application has the following beneficial effects:
[0025] 1. The elevator trapped person self-rescue device based on the gearless traction machine can quickly stop the elevator at the nearest level through the star-sealing emergency leveling controller and the brake device to prevent passengers from further harm; and the passengers can communicate with the rescue center through the networked rescue terminal to obtain timely help and guidance, which increases the self-rescue ability in the case of entrapment; and the control system can monitor the operating status of the elevator in real time. Once a fault occurs, it can accurately determine the type of fault and promptly notify the maintenance personnel to repair it, thereby improving maintenance efficiency; in general, the elevator trapped person self-rescue device based on the synchronous gearless traction machine improves the safety of the elevator through various measures, provides passengers with a safer and more convenient use experience, and provides self-rescue and fault diagnosis functions.
[0026] 2. The rescue method of the elevator trapped person self-rescue device based on the synchronous gearless traction machine, the Fengxing emergency platform controller controls the disconnection and reconnection of the elevator system's safety circuit or power supply main circuit, and cuts off the power after the passengers leave to ensure safety and provide preparation for maintenance. This can enhance safety, prompt passengers to evacuate quickly and make maintenance ready. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 1 is a front view of the elevator trapped person self-rescue device based on the gearless traction machine in this embodiment;
[0028] Figure 2 is a flow chart of a self-rescue method of an elevator trapped person self-rescue device based on a gearless traction machine in this embodiment;
[0029] Explanation of the reference numerals: 1. Car; 2. Synchronous gearless traction machine; 4. Sealing star emergency leveling controller; 5. Counterweight; 6. Traction rope; 7. Camera; 8. Machine room control cabinet; 9. Machine room camera; 10. Machine room. DETAILED DESCRIPTION
[0030] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.
[0031] The present invention discloses a self-rescue device and method for people trapped in an elevator based on a synchronous gearless traction machine 2, such as Figure 1As shown, the elevator trapped person self-rescue device based on the gearless traction machine 2 includes a car 1, a synchronous gearless traction machine 2, a brake, a control system, a star-sealing emergency leveling controller 4, a counterweight 5, an online rescue terminal, a machine room control cabinet 8, a machine room 10 and a machine room camera 9 arranged in the machine room 10. A traction rope 6 is arranged on the top of the car 1, one end of the traction rope 6 is connected to the car 1, and the other end of the traction rope 6 passes through the synchronous gearless traction machine 2, the brake and is connected to the counterweight 5 in sequence. The elevator trapped person self-rescue device based on the synchronous gearless traction machine 2 uses the synchronous gearless traction machine 2 as a driving force source, and the The traction rope 6 is used to provide the lifting and lowering power of the car 1; the star-sealing emergency leveling controller 4 receives the brake release signal, real-time speed feedback and leveling signal; the brake release signal refers to the rescue signal transmitted by the maintenance personnel through the 4G network in the event of an elevator failure or trapped people. After comparing and confirming the audio and video on the scene, real-time docking, and determining that rescue is needed, the maintenance personnel press a one-key help button on the APP; after receiving the brake release signal, the star-sealing emergency leveling controller 4 will automatically slide the elevator in the star-sealing state at a speed of about 0.15m / s to the nearest leveling floor, and lock the car door to prevent passengers from being trapped. Numb self-rescue; this can ensure the safety of trapped passengers and avoid further injuries; and the Fengxing emergency leveling controller 4 can accurately control the running speed of the elevator through real-time speed feedback; when the elevator runs to a distance close enough to the leveling floor, the controller can stop in time according to the real-time speed feedback, and ensure that the elevator stops smoothly at the target leveling floor; this can reduce the trapped time of trapped passengers and improve rescue efficiency; and the Fengxing emergency leveling controller 4 can not only receive the leveling signal, but also accurately locate through real-time speed feedback; by accurately controlling the running speed and parking time of the elevator, the error of the elevator stopping at the leveling position can be minimized as much as possible, improving the comfort and safety of passengers; the Fengxing emergency leveling controller 4 can receive feedback information from various sensors in real time, including speed feedback and leveling signals, etc.; this information can be used for fault diagnosis and maintenance, timely detect the running status of the elevator, determine the type and location of the fault, and improve maintenance efficiency and accuracy; in summary, the Fengxing emergency leveling controller 4 can improve the safety of the elevator, reduce the trapped time, achieve accurate leveling and parking, and provide convenient fault diagnosis and maintenance functions by receiving the release signal, real-time speed feedback and leveling signal.
[0032] The holding brake in the device can fix the traction rope 6 of the car 1 to prevent accidental movement of the elevator.
[0033] The control system is the core part of car 1, which controls the operation, parking and fault handling of car 1; in the event of entrapment, the control system can take corresponding measures according to the fault situation to ensure the safety of passengers; the device is connected to an external rescue center or management center. Once a fault or entrapment occurs, passengers can conduct real-time two-way audio and video communication with the rescue center through the terminal to obtain help and guidance.
[0034] Therefore, through the star-sealing emergency leveling controller 4 and the brake device, the elevator can be quickly stopped at the nearest level to prevent passengers from further injury; and the passengers can communicate with the rescue center through the networked rescue terminal to obtain timely help and guidance, which increases the self-rescue ability in trapped situations; and the control system can monitor the operating status of the elevator in real time. Once a fault occurs, it can accurately determine the type of fault and promptly notify maintenance personnel to repair it, thereby improving maintenance efficiency.
[0035] In general, the elevator trapped person self-rescue device based on the synchronous gearless traction machine 2 improves the safety of the elevator through various measures, provides passengers with a safer and more convenient use experience, and provides self-rescue and fault diagnosis functions.
[0036] A camera 7 is provided inside the car 1, and the camera 7 can monitor the situation inside the elevator, including passengers and items, in real time; this can provide security, timely monitor and prevent bad behavior, and ensure the safety of passengers in the elevator; the camera 7 can record the situation inside the elevator and the dynamic situation of the machine room 10, including the process of sudden incidents, such as falls, sudden power outages, etc.; this record can help relevant personnel to investigate and deal with the incident afterwards, and find out the cause and responsibility of the incident; in the event of entrapment, the camera 7 can provide real-time images and conditions of the passengers, help rescuers better understand the situation and guide the rescue process; the camera 7 can help maintenance personnel perform technical maintenance and troubleshooting of the elevator; by observing the images of the camera 7 in real time, the maintenance personnel can more accurately judge the problems inside the elevator, and make corresponding repairs and adjustments.
[0037] It also includes a mobile phone and an Internet of Things rescue terminal; the camera 7 needs to be able to capture the image inside the car 1 so that the rescue personnel can understand the situation of the trapped person and provide corresponding guidance. The signal output end of the camera 7 is connected to the input end of the Internet of Things rescue terminal; as the core equipment for rescue, the Internet of Things rescue terminal has voice and video acquisition functions, and can receive and send rescue information; it needs to have sound and video sensors to collect voice and video signals in the car 1, and convert them into text prompts or push them to relevant rescue personnel; the output end of the Internet of Things rescue terminal is connected to the signal input end of the rescue personnel's mobile phone. The mobile phone of the property or maintenance personnel serves as a terminal for receiving rescue information. It can receive the pushed rescue information, determine if on-site rescue is needed, and rush to the scene for rescue.
[0038] In addition, a playback device is provided inside the car 1, and the input end of the playback device is connected to the output end of the Internet of Things rescue terminal; the playback device is used to play videos and music that help rescue and relieve tension, helping trapped passengers relieve tension; the playback device can be a function built into the Internet of Things rescue terminal, or it can be an independent audio and video interactive playback device.
[0039] Moreover, the interior of the car 1 is provided with a temperature sensor, a human infrared sensor, a gravity acceleration sensor, and an oxygen concentration sensor so as to provide more comprehensive trapped environment monitoring information.
[0040] Therefore, through the camera 7, voice and video sensors and other equipment, the situation and environmental information of the trapped passengers can be obtained in real time so that the rescue personnel can make corresponding rescue decisions; and by timely pushing rescue information to the mobile phones of property or maintenance personnel, the rescue personnel can respond quickly and rush to the scene, thereby improving the rescue speed, and by pre-recorded synchronized rescue soothing voices, playing soothing videos and music, it helps the trapped passengers relieve tension, anxiety and fear; and the interactive function of the rescue program can guide the trapped passengers to complete the self-rescue process step by step according to the instructions through audio and video prompts, thereby improving the self-rescue ability and efficiency; in short, the use of these hardware devices can improve the safety and rescue efficiency of trapped persons, and increase the automation and humanization of the rescue process.
[0041] like Figure 2 As shown, the rescue method of the elevator trapped person self-rescue device based on the gearless traction machine 2, the rescue steps include:
[0042] S1: When a fault occurs in car 1, car 1 sends a self-rescue instruction to the Fengxing emergency platform controller, which determines through a computer whether the rescue program needs to be activated and controls the circuit breaker in the machine room to cut off the main power supply. The processor determines and activates the backup UPS power supply to give a switch instruction to the synchronous traction machine. The Fengxing emergency platform controller is an electronic control device, which is connected to the elevator control system and has a special emergency rescue function. When a problem occurs in car 1 and a self-rescue instruction is sent, the Fengxing emergency platform controller can receive and interpret these instructions, and then control the elevator system to enter the corresponding self-rescue mode. The synchronous traction machine is the driving device of the elevator, which includes a motor and a traction wheel. The operation of car 1 is achieved by controlling the rotation of the motor. When the Fengxing emergency platform controller receives the self-rescue instruction, it will shut down the elevator system by cutting off the main power switch. The system is switched to the special working mode of the synchronous traction machine, so that the synchronous traction machine can control the car 1 to move according to the lightness and heaviness; by switching the elevator system to the special working mode of the synchronous traction machine, the car 1 can realize self-rescue operation, thereby improving the self-rescue ability and efficiency of trapped passengers; passengers can complete corresponding actions according to the instructions, such as opening the door, moving to the designated position, etc.; the Fengxing emergency platform controller can control the synchronous traction machine through the switch gate instruction to accurately control the position of the car 1; this is very important in an emergency situation, which can ensure that the car 1 moves according to the predetermined path and position during the self-rescue process to avoid unnecessary accidents; the Fengxing emergency platform controller and the synchronous traction machine can realize the self-rescue operation of the car 1 and reduce the dependence on rescue personnel; at the same time, during the self-rescue process, the communication between the controller and the car 1 can provide guidance and help to improve the rescue efficiency.
[0043] In general, the application of the Fengxing emergency platform controller and the synchronous traction machine can enable the car 1 to be effectively controlled during the self-rescue process, improve the self-rescue ability and efficiency of the trapped passengers, while reducing the dependence on rescue personnel and improving the rescue efficiency.
[0044] S2: The star-sealing emergency platform controller controls and cuts off the safety circuit or main power supply circuit of the control system; after arriving at the door area, power is supplied to open the door, and after leaving car 1, power is cut off and waiting for maintenance. The star-sealing emergency platform controller will cut off the safety circuit or main power supply circuit in the elevator control system; the safety circuit or main power supply circuit is a key part of the elevator system. Cutting them off will prevent car 1 from receiving normal control signals, thereby stopping the normal operation of the elevator; when car 1 arrives at the door area, the star-sealing emergency platform controller will reconnect the main power supply circuit of the elevator control system, supply power to the elevator system, and send a door opening command; this can ensure that the door of car 1 is opened at the appropriate time to facilitate the departure of passengers; after the passengers leave car 1, the star-sealing emergency platform controller The main power supply circuit of the elevator main power supply circuit breaker will be cut off again, causing the elevator to stop running and wait for maintenance personnel to arrive for maintenance and repair; by cutting off the safety circuit or the main power supply circuit of the control system, it can ensure that car 1 stops running completely, reducing the risk of further safety accidents; this is the most critical step in an emergency, which can protect the lives of passengers; after opening the door, passengers can quickly leave car 1, because the controller reconnects the elevator system, ensuring that the door opens in the appropriate position and providing passengers with a convenient exit; the Fengxing emergency platform controller cuts off power after the passengers leave car 1 and waits for the arrival of maintenance personnel; this ensures that maintenance personnel can safely maintain and repair the elevator and reduce fault recovery time.
[0045] In summary, the Fengxing emergency platform controller controls the disconnection and reconnection of the elevator system's safety circuit or main power supply circuit, and cuts off power after the passengers leave to ensure safety and provide preparation for maintenance; this can enhance safety, promote rapid evacuation of passengers and preparation for maintenance.
[0046] S3: The star-sealing emergency platform controller controls the elevator car 1 and makes the car 1 slide to the leveling position in the heavy load direction. The star-sealing emergency platform controller will detect whether the elevator car 1 is overloaded; it will monitor the heavy load sensor or load sensor in the elevator. If the load sensor detects an overload signal, the controller will trigger the corresponding emergency measures; once an overload signal is detected, the star-sealing emergency platform controller will cut off the elevator power system and stop the normal operation of the elevator; this includes cutting off the power supply and control signal of the elevator motor so that the elevator can no longer move up and down normally; after cutting off the elevator power, the star-sealing emergency platform controller will release the brake or other mechanical devices to allow the car 1 to slide freely to the position closest to the leveling in the star-sealing state; this can ensure that passengers get on and off at the leveling position and reduce the risk of failure caused by overloading; after the car 1 slides to the leveling position, the star-sealing emergency platform controller will take further measures, such as cutting off the power supply of the elevator, to ensure safety and prepare for the arrival of maintenance personnel.
[0047] When the elevator is overloaded, the control of the Fengxing emergency platform controller can cut off the elevator power system to prevent the elevator from continuing to run, reduce the potential risks and accidents caused by overload, and protect the safety of passengers and elevator equipment; the control of the Fengxing emergency platform controller allows the car 1 to slide to the leveling position in the heavy load direction, avoiding further damage and failure that may be caused by continued operation due to overload, and protecting the integrity of the elevator system; after sliding to the leveling position, passengers can enter and exit the car 1 more conveniently, because the car 1 stays at the leveling position, and the passengers do not need to climb or cross uneven ground between floors; the control of the controller makes the car 1 slide to the leveling position and further cut off the elevator power supply, providing a safe working environment and maintenance conditions for the arrival of maintenance personnel.
[0048] In summary, the Fengxing emergency platform controller controls car 1 to slide to the leveling position in the heavy-load direction. By cutting off the power, allowing car 1 to slide freely and preparing for maintenance, the safety of the elevator is enhanced, further damage is avoided, passenger evacuation is facilitated, and preparations are provided for maintenance.
[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A self-rescue device for people trapped in an elevator based on a synchronous gearless traction machine (2), characterized in that: The invention comprises a car (1), a synchronous gearless traction machine (2), a brake, a control system, a star-sealing emergency leveling controller (4), a counterweight (5), a networked rescue terminal, a machine room control cabinet (8), a machine room (10), and a machine room camera (9) arranged in the machine room (10); a traction rope (6) is arranged on the top of the car (1); one end of the traction rope (6) is connected to the car (1); and the other end of the traction rope (6) passes through the synchronous gearless traction machine (2), the brake and is connected to the counterweight (5) in sequence.
2. The elevator trapped person self-rescue device based on the synchronous gearless traction machine (2) according to claim 1 is characterized in that: A camera (7) is provided inside the car (1) for monitoring the internal conditions of the car (1) and providing a video signal.
3. The elevator trapped person self-rescue device based on the gearless traction machine (2) according to claim 2 is characterized in that: It also includes a mobile phone and an Internet of Things rescue terminal, wherein the signal output end of the camera (7) is connected to the input end of the Internet of Things rescue terminal, and the output end of the Internet of Things rescue terminal is connected to the signal input end of the mobile phone of the rescuer.
4. The elevator trapped person self-rescue device based on the synchronous gearless traction machine (2) according to claim 1 is characterized in that: A playback device is provided inside the car (1), and an input end of the playback device is connected to an output end of an Internet of Things rescue terminal.
5. The elevator trapped person self-rescue device based on the synchronous gearless traction machine (2) according to claim 1 is characterized in that: A temperature sensor, a human infrared sensor and a gravity acceleration sensor are arranged inside the elevator car (1).
6. The elevator trapped person self-rescue device based on the synchronous gearless traction machine (2) according to claim 1 is characterized in that: An oxygen concentration sensor is arranged inside the car (1).
7. A self-rescue method for an elevator trapped person self-rescue device based on a gearless traction machine (2) as claimed in any one of claims 1 to 6, characterized in that: The rescue steps include: S1: When the car (1) stops due to power outage or electrical fault protection, the car (1) sends a self-rescue instruction to the star-sealing emergency platform controller, and sends a switch instruction to the synchronous traction machine; S2: The satellite sealing emergency platform controller controls and cuts off the control system safety circuit or the main power supply circuit; After reaching the door area, power is supplied to open the door, and after leaving the car (1), power is cut off and wait for maintenance; S3: The star-sealing emergency platform controller controls the car (1) and causes the car (1) to slide to the leveling position in the heavy-load direction.