Rapid rescue device for people trapped in vertical ladder in counterweight balance state

Abstract

The utility model relates to a quick rescue device for people trapped in a vertical ladder in a counterweight balance state. The quick rescue device comprises a control box, a driving circuit, an electric elevator and a ground anchor, the electric elevator is installed at the bottom of the elevator car and provided with a steel wire rope and a lifting hook. The ground anchor is mounted on the ground of an elevator shaft; the driving circuit is used for driving the electric elevator, and the control box is used for remotely controlling the operation of the electric elevator; the lifting hook can ascend and descend relative to the ground anchor, the lifting hook is used for being combined with the ground anchor, and when the elevator is in counter-weight balance, the elevator car moves downwards to a flat layer through the winding effect of the electric hoister on the steel wire rope. The device is used for quickly rescuing trapped passengers in the vertical ladder in a counter-weight balance state, is simple in structure, and can quickly rescue the trapped passengers, shorten the trapped time, reduce the psychological pressure of the trapped passengers and ensure the personal safety.

Description

TECHNICAL FIELD

[0001] The utility model relates to a straight ladder auxiliary rescue facility technical field, concretely relates to a kind of for the quick rescue device of the straight ladder of the state of balance of counterweight. BACKGROUND

[0002] During the operation of elevator, due to various reasons, such as mechanical failure, electrical failure, control device failure, etc., the situation of stopping elevator and trapping people may occur, in order to ensure personal safety, the passengers must be rescued in the shortest time. The straight elevator in the state of balance of counterweight must break the balance, move the car to the landing floor and then put the passengers out to achieve the purpose of rescue. The traditional elevator is divided into elevator with machine room and elevator without machine room. The elevator with machine room is provided with a special elevator machine room, and the main components such as traction machine, control cabinet and brake are installed in the machine room. In the case of elevator failure or balance of car and counterweight, the hand wheel or its auxiliary equipment can be used to rotate the car to move the car to the nearest landing floor for rescue. The elevator without machine room is different from the elevator with machine room in that all the devices are installed inside the shaft except for some control devices installed in the control cabinet inside the shaft. When the elevator fails or the car and the counterweight are in balance, it is not possible to move the car using the rotating device in the machine room as in the elevator with machine room, so as to achieve the purpose of quickly rescuing the trapped passengers. This is the defect of the elevator without machine room.

[0003] The traditional rescue method includes combining the rescue support to form a lifting device, lifting sandbags to the top of the car to increase the weight of the car, making the car go down, and then putting the passengers out after landing to achieve the purpose of rescue. This method has low cost, but it takes a lot of time to transport and assemble the rescue support, and multiple people are needed to work together. The sandbags are lifted repeatedly, the rescue efficiency is low, the rescue time is long, and the trapped passengers may experience great psychological pressure and anxiety, which may lead to accidental injury and illness. Another way is to install a ground anchor at the bottom of the shaft, install a pulley on the ground anchor, wrap the compensation chain on one side of the traction car or counterweight around the pulley, fix a special rope clamp on the elevator compensation chain to ensure safety, and pull the compensation chain to move the car up or down to the nearest landing floor. This structure allows the car to move in both directions to the nearest landing floor. However, this method must repeatedly adjust the position of the rope clamp multiple times during operation, and the operator needs to be skilled in adjusting the fixed rope clamp, which takes a long time to rescue. SUMMARY

[0004] (I) Technical problem to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a quick rescue device for the straight elevator trapped in the state of balance of counterweight, which can greatly shorten the rescue time. According to the test, when the car moves 20m at a speed of 0.2m / s during the rescue process, the total time consumption is not more than 10min, which can effectively alleviate the psychological pressure of the trapped personnel and ensure personal safety.

[0006] (II) Technical solution

[0007] A device for quickly rescuing people trapped in a straight ladder in a counterweight balance state, characterized in that it comprises a control box, a drive circuit, an electric hoist and a ground anchor; the electric hoist is installed at the bottom of the elevator car, and the electric hoist is provided with a steel wire rope and a hook; the ground anchor is installed on the ground of the elevator shaft; the drive circuit is used to drive the electric hoist, and the control box is used to remotely control the operation of the electric hoist; the hook can move up and down relative to the ground anchor, and the hook is used to combine with the ground anchor; when the elevator is in counterweight balance, the electric hoist is used to wind the steel wire rope, so that the elevator car moves downward to the flat layer. After the elevator car moves to the flat layer, the passengers can be released, and the rescue purpose is achieved.

[0008] According to the preferred embodiment of the utility model, preferably, the ground anchor comprises a push-pull electromagnet, a lock rod and a locking frame, the push-pull electromagnet is driven by the drive circuit and remotely controlled by the control box, so that the push-pull electromagnet pushes the lock rod into the lock hole of the locking frame or pulls the lock rod out of the lock hole of the locking frame, and the hook can be hooked or unhooked with the lock rod.

[0009] According to the preferred embodiment of the utility model, preferably, the control box is connected with the electric hoist through a traveling control cable to realize remote control of the operation of the electric hoist.

[0010] According to the preferred embodiment of the utility model, preferably, the control box is connected with the push-pull electromagnet through a ground anchor control cable to remotely control the push-pull electromagnet.

[0011] According to the preferred embodiment of the utility model, preferably, the hook of the electric hoist is connected to the steel wire rope of the electric hoist through a flexible spring.

[0012] The utility model is applied on the premise that the elevator has a star circuit or a pulse braking circuit to control the running speed of the elevator car in the rescue process, so as to ensure the safety of passengers and equipment in the elevator rescue process; the elevator without a star circuit or a pulse braking circuit needs to be transformed and installed with the rescue device.

[0013] According to the preferred embodiment of the utility model, preferably, the net weight of the electric hoist accounts for not more than 5% of the weight percentage of the elevator car, so as to reduce the influence on the original balance state of the elevator car.

[0014] According to the preferable embodiment of the utility model, preferably, the electric hoist is installed on the lower beam of the elevator car through the mounting bracket, and the mounting bracket is connected with the lower beam of the elevator car by bolting or welding; the total weight of the facilities connected at the bottom of the elevator car is less than 50Kg, and the facilities include the mounting bracket, the electric hoist and the connecting structure such as bolts, thereby ensuring that the load at the bottom of the elevator car meets the safety requirements.

[0015] According to the preferable embodiment of the utility model, preferably, the control box is located on the outer wall of the ground floor outside the elevator shaft, which is convenient for the rescue personnel to operate and avoids interference with the equipment inside the elevator shaft.

[0016] According to the preferable embodiment of the utility model, preferably, the electric hoist is the existing product PA1000 crane. When the rescue device is installed in the existing elevator, the force data required to break the balance is first measured, and the data is used as the selection basis for the electric hoist (crane). At the same time, considering that the required drag force is different for different brands, the force of 1.5-2 times the maximum force required to break the balance is used as the reference condition for the selection of the electric hoist.

[0017] According to the preferable embodiment of the utility model, preferably, the ground anchor includes 2-6 sets of push-pull electromagnets, lock rods matched with the push-pull electromagnets and locking frames matched with the push-pull electromagnets. These push-pull electromagnets, lock rods matched with the push-pull electromagnets and locking frames matched with the push-pull electromagnets are arranged around a center, and the center corresponds to the projection of the hook of the elevator car on the bottom surface of the elevator shaft in the static state.

[0018] According to the preferable embodiment of the utility model, preferably, the hook of the electric hoist is a hollow spherical structure composed of multiple rings; an inductive switch is arranged inside the area surrounded by the push-pull electromagnets, the lock rods matched with the push-pull electromagnets and the locking frames matched with the push-pull electromagnets. When the hook enters the inside of the area, it is inducted by the inductive switch. Each push-pull electromagnet pushes its matched lock rod to slide into the lock hole of the corresponding locking frame, so as to lock the hook. Through the scheme, the electric hoist and the ground anchor can be automatically hooked and unhooked, without the need for workers to manually operate in the elevator shaft, thereby greatly improving the safety of the rescue process.

[0019] Preferably, a guide plate is arranged above the area surrounded by the multiple sets of push-pull electromagnets, the lock rods matched with the push-pull electromagnets and the locking frames matched with the push-pull electromagnets, so that the hook smoothly enters the inside of the area surrounded by the push-pull electromagnets, the lock rods matched with the push-pull electromagnets and the locking frames matched with the push-pull electromagnets, thereby improving the combination accuracy and combination speed between the hook and the ground anchor, and further accelerating the rescue speed.

[0020] (Three) beneficial effects

[0021] The utility model is used to the quick rescue device of the passenger who is trapped in the straight elevator under the counterweight balance state, simple structure, can rescue the passenger who is trapped fast, shortens the time of being trapped, reduces the psychological pressure of the passenger who is trapped, guarantees the personal safety.

[0022] The main working components of the quick rescue device are an electric hoist and a ground anchor, and each part has a relatively simple structure. The electric hoist (commonly known as a crane or an electric hoist) is a mature product, has few components, has a low failure rate, and has high reliability. The main component of the ground anchor is an electromagnet, which has a simple structure, is easy to install and test, is easy to maintain, and has a long service life. The locking frame of the ground anchor and the mounting bracket of the electric hoist are steel processing parts, which have a simple structure and are easy to install. The electric hoist has a small size and weight, which does not have a significant impact on the load capacity of the elevator car, and ensures the normal volume of the elevator. There is only a ground anchor (not involving a driving motor) in the elevator shaft, so even if there is leakage or flooding in the shaft, it does not affect the normal use of the rescue device, and the risk of being unable to use due to leakage in the shaft is eliminated.

[0023] In the utility model, the ground anchor adopts a push-pull electromagnet to push the locking rod out of the locking hole of the locking frame. After the rescue is completed, the hook of the electric hoist is automatically decoupled from the ground anchor, without the need for manual operation. A plurality of push-pull electromagnets, locking rods matched with the push-pull electromagnets, and locking frames are arranged around a center. The hook is provided in the form of a hollow spherical structure composed of multiple rings. The area surrounded by the push-pull electromagnets, the locking rods matched with the push-pull electromagnets, and the locking frames is provided with an inductive switch. Through the scheme, the electric hoist and the ground anchor can be automatically coupled, without the need for workers to enter the elevator shaft for manual operation, thereby improving the safety of the rescue process.

[0024] The quick rescue device only needs two rescue personnel to operate at most. According to tests, when the car moves at a speed of not more than 0.3 m / s for 20 m, the total rescue time is only about 5.5-8.5 minutes (including the operation of lowering the hook to the position, coupling, and pulling to the landing floor). The existing rescue device needs 20 minutes or even longer to complete the operation of moving the elevator car to the nearby landing floor. The rescue device has a rescue speed that is significantly better than the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic view of the quick rescue device for the passenger who is trapped in the straight elevator under the counterweight balance state of embodiment 1.

[0026] Figure 2 It is a schematic view of the electric hoist and its installation of the quick rescue device for the passenger who is trapped in the straight elevator under the counterweight balance state of embodiment 1.

[0027] Figure 3The schematic diagram of the ground anchor structure of the quick rescue device for the person trapped in the elevator in the counterweight balance state of the embodiment 1.

[0028] Figure 4 The schematic diagram of the control box of the quick rescue device for the person trapped in the elevator in the counterweight balance state of the embodiment 1.

[0029] Figure 5 The schematic diagram of the ground anchor structure of the quick rescue device for the person trapped in the elevator in the counterweight balance state of the embodiment 3.

[0030] Figure 6 The schematic diagram of the hook of the electric hoist of the quick rescue device for the person trapped in the elevator in the counterweight balance state of the embodiment 3. DETAILED DESCRIPTION

[0031] In order to better explain the present application, so as to understand, the following will be combined with the drawings, through specific embodiments, the present application is described in detail.

[0032] As Figure 1 shown, the utility model provides a kind of for the quick rescue device for the person trapped in the elevator in the counterweight balance state, including control box 10, drive circuit 20, electric hoist 30 and ground anchor 40.Electric hoist 30 is installed in the bottom of elevator car 50, and electric hoist 30 is equipped with steel wire rope 31 and hook 32.Ground anchor 40 is installed on the ground of elevator shaft.Drive circuit 20 is used to drive electric hoist 30, and control box 10 is used to remotely control the operation of electric hoist 30 to make the hook 32 of electric hoist 30 can be lifted and moved relative to ground anchor 40.In the rescue process, hook 32 is used to combine with ground anchor 40, and when the elevator is in counterweight balance, the winding effect of electric hoist 30 to steel wire rope 31 is used to break balance, so that elevator car 50 moves to the nearest flat layer.Down.When elevator car 40 moves to flat layer, passenger can be put out, and rescue purpose is achieved.

[0033] In the process of rescuing the trapped passengers, after the staff arrive at the malfunctioning elevator, one staff member is responsible for managing the control box 10, and opens the electric hoist 30 through the control box 10 to release the steel wire rope 31. With the release of the steel wire rope 31, the hook 32 is lowered to the ground near the elevator shaft, and the staff on the ground of the elevator shaft manually hooks the hook 32 with the ground anchor 40. The staff member responsible for managing the control box 10 then opens the electric hoist 30 to wind the steel wire rope 31, and sets the winding length of the steel wire rope 31 according to the nearest landing, and with the winding of the steel wire rope 31, the elevator car 50 is constantly and smoothly lowered to the nearest landing, and then the staff opens the door of the elevator car 50 to rescue the trapped passengers. After that, the staff on the ground of the elevator shaft manually unhook the hook 32 from the ground anchor 40, and the staff member responsible for managing the control box 10 opens the homing instruction of the hook 32, and the electric hoist 30 winds the steel wire rope 31 to return the hook 32 to the initial position. The two staff members can use the intercom to communicate with each other to coordinate their respective responsibilities.

[0034] As shown in Figure 2 , the electric hoist 30 is installed on the lower beam 51 of the elevator car 50 through the mounting bracket 33, and the mounting bracket 33 is connected to the lower beam 51 of the elevator car 50 by bolts or by welding. The total weight of the facilities added to the bottom of the elevator car 50 should be less than 50Kg to ensure that the load on the bottom of the elevator car 50 meets the safety requirements. The total weight of these facilities includes the weight of the mounting bracket 33, the weight of the electric hoist 31, and the weight of the connecting bolts and other connecting structures. Among them, the net weight of the electric hoist 30 accounts for no more than 5% of the weight of the elevator car, in order to reduce the impact on the original balance state of the elevator car 50. In order to quickly complete the rescue work of the rescue staff, the control box 10 is preferably arranged on the outer wall of the ground landing outside the elevator shaft, which is convenient for the rescue personnel to operate and avoids interference with the equipment inside the elevator shaft.

[0035] The ground anchor 40 can be a hook, a rod, a metal ring, or other structure fixed to the ground, as long as it can be stably connected with the hook 32. In the present embodiment, as shown in Figure 3 , the ground anchor 40 can be further provided with a push-pull electromagnet 41. Specifically, the ground anchor includes a push-pull electromagnet 41, a locking rod 42, and a locking bracket 43. The push-pull electromagnet 41 is driven by a driving circuit and remotely controlled by the control box 10, so that the push-pull electromagnet 41 pushes the locking rod 42 into the locking hole 43 of the locking bracket or pulls the locking rod 42 out of the locking hole of the locking bracket 43, so that the hook 32 can be stably hooked or unhooked with the locking rod 42. By Figure 3The structure of the ground anchor 40 shown in the figure, when initially combined with the hook 32, needs to be manually connected by the staff in the elevator shaft; after the rescue is over, when the hook 32 needs to be unhooked from the ground anchor 40, it only needs to be remotely controlled at the control box 10 to exit the locking rod 42 from the locking frame 43, without the need for manual unhooking by the staff, simplifying the operation and improving safety. As shown in the figure Figure 1 As shown, the control box 10 is connected to the electric hoist 30 through the traveling control cable 11 to realize remote control of the operation of the electric hoist 30. The control box 10 is also connected to the push-pull electromagnet 41 of the ground anchor 40 through the ground anchor control cable 12 to remotely control the push-pull electromagnet 41.

[0036] When the rescue device is installed in an existing elevator, the force data required to break the "counterweight balance state" is first measured, and this data is used as the basis for selecting the electric hoist 30 (crane). Different brands require different pulling forces, and the maximum breaking force of 1.5-2 times is used as a reference condition for selecting the electric hoist 30. Preferably, the electric hoist 30 is the existing product PA1000 crane, which can meet the rescue needs of most straight elevator trapped people.

[0037] As shown in the figure Figure 4 As shown, it is a schematic diagram of the control panel of the control box 10. The control box 10 is installed on the connection line of the drive circuit 20, the electric hoist 30 and the push-pull electromagnet 41. The buttons on the surface of the control box 10 include "total open", "release", "collect", "emergency stop", "anchor release" and the like. The "total open" is a total switch, which is used to power on or power off the electric hoist 30 and the push-pull electromagnet 41; "release" means to control the electric hoist 30 to release the steel wire rope 31 to make the hook 32 descend; "collect" means to control the electric hoist 30 to wind the steel wire rope 31 to make the hook 32 ascend; "emergency stop" means to control the electric hoist 30 to immediately stop operating; "anchor release" means to control the push-pull electromagnet 41 to exit the locking rod 42 from the locking frame 43, and complete the disengagement of the hook 32 from the ground anchor 40.

[0038] The premise of application of the quick rescue device is that the elevator has a star-enclosing circuit or a pulse braking circuit to control the running speed of the elevator car in the rescue process, so as to ensure the safety of passengers, equipment and staff in the rescue process of the elevator. When the elevator does not have a star-enclosing circuit or a pulse braking circuit, the circuit of the elevator needs to be modified before the rescue device can be installed. The star-enclosing circuit is a special protection device for power systems or electromechanical equipment, and the main function is to form a closed loop by short-circuiting the motor winding to convert mechanical energy into electrical energy consumption, thereby realizing emergency braking or safety protection. The pulse braking circuit is a circuit system for quickly consuming the power generation energy of the motor to prevent the voltage from being too high, which is commonly used in power electronic devices such as frequency converters, and its core function is to control the access of the braking resistor through a controllable pulse signal to convert the excess energy into heat energy, thereby ensuring the safe operation of the equipment. The star-enclosing circuit can control the speed of the traction machine to be not more than 0.3 m / s; the pulse braking circuit ensures that the brake can only be opened for a short time.

[0039] Embodiment 2

[0040] This embodiment is further connected with a flexible spring at the lower end of the steel wire rope 31 of the electric hoist 30 on the basis of embodiment 1, and the lower end of the flexible spring is further connected with the hook 32. This structure is suitable for occasions where the elevator uses a pulse braking circuit.

[0041] The working mode of the rescue device of this embodiment is as follows: first, the electric hoist 30 is started to pull up the flexible spring to the maximum, then the operation of the electric hoist 30 is stopped, and the elevator car 50 continues to descend by using the pulling force of the flexible spring. When the pulling force of the flexible spring decreases, the electric hoist 30 is started again to wind the steel wire rope 31 so that the flexible spring is stretched again, and the elevator car 50 continues to descend by using the pulling force of the flexible spring. This repeated operation makes the elevator car 50 reach the nearest landing position, avoiding the problem of repeated overloading of the electric hoist caused by repeated stopping in a short time, which leads to overheating protection shutdown of the electric hoist.

[0042] Embodiment 3

[0043] This embodiment is improved on the basis of embodiment 1 or 2 as follows:

[0044] As shown in Figure 5 , the ground anchor 40 includes three sets of push-pull electromagnets 41, locking rods 42 and locking frames 43 (represented by 41A-41C, 42A-42C and 43A-43C respectively), which are arranged around a center, which is opposite to the projection of the hook 32 of the elevator car 50 on the bottom surface of the elevator shaft in the static state. As shown in Figure 6 , the hook 32 of the electric hoist 30 is further provided in a hollow spherical structure composed of multiple loops (as shown in Figure 6Preferably, an inductive switch is arranged inside the area surrounded by the three sets of push-pull electromagnets 41, the locking rods 42 and the locking frames 43, and the inductive switch is inducted when the hook 32 enters the area, at which time the three sets of push-pull electromagnets 41 push the corresponding locking rods 42 into the locking holes of the corresponding locking frames 43, thereby automatically locking the hook 32. Through this scheme, at the beginning of the rescue, the staff does not need to go to the bottom of the elevator shaft to manually combine the hook 32 with the ground anchor 40; when the hook 32 needs to be reset after the rescue of the trapped person is completed, the three sets of push-pull electromagnets 41 pull the locking rods 42 to automatically exit from the locking holes of the locking frames 43, at which time the unhooking is automatically completed, and the staff does not need to enter the elevator shaft to manually operate, greatly improving the safety of the rescue process.

[0045] Further, a horn-shaped inclined guide plate can be arranged above the area surrounded by the three sets of push-pull electromagnets 41, the locking rods 42 and the locking frames 43, so that the hook 32 can smoothly enter the area surrounded by the three sets of push-pull electromagnets 41, the locking rods 42 and the locking frames 43 along the surface of the inclined guide plate during the descending process, and then quickly and automatically combine with the ground anchor. In this case, even if the hook 32 swings to a certain extent during the descending process, it does not affect the accurate positioning and quick combination between the hook 32 and the ground anchor 40, further accelerating the rescue speed; since the staff does not need to manually connect the hook 32 with the ground anchor 40 at the bottom of the elevator shaft, the safety of the staff during the rescue operation is further improved.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent substitutions for part or all of the technical features; and these modifications or substitutions, or the combination of the technical features in the above embodiments without mutual conflict, can be combined in the manner described in the embodiments, and these modifications, substitutions or combinations do not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rapid rescue device for people trapped in a straight ladder under a state of gravity balance, characterized in that, The system includes a control box, a drive circuit, an electric hoist, and a ground anchor. The electric hoist is installed at the bottom of the elevator car and is equipped with a wire rope and a hook. The ground anchor is installed on the floor of the elevator shaft. The drive circuit drives the electric hoist, and the control box remotely controls the operation of the electric hoist. The hook can move up and down relative to the ground anchor and is used to engage with the ground anchor. When the elevator is in counterweight balance, the electric hoist retracts the wire rope, causing the elevator car to move downwards to the floor level.

2. The rapid rescue device for people trapped in a straight ladder under a state of counterbalance as described in claim 1, characterized in that, The ground anchor includes a push-pull electromagnet, a locking rod, and a locking frame. The push-pull electromagnet is driven by the drive circuit and remotely controlled by the control box, so that the push-pull electromagnet pushes the locking rod into the locking hole of the locking frame or pulls the locking rod out of the locking hole of the locking frame, so that the hook can hook or unhook with the locking rod.

3. The rapid rescue device for people trapped in a straight ladder under a state of counterbalance as described in claim 1, characterized in that, The control box is connected to the electric hoist via a traveling control cable to enable remote control of the electric hoist's operation.

4. The rapid rescue device for people trapped in a straight ladder under a state of counterbalance as described in claim 2, characterized in that, The control box is connected to the push-pull electromagnet via a ground anchor control cable, so as to remotely control the push-pull electromagnet.

5. The rapid rescue device for people trapped in a straight ladder under a state of counterbalance as described in claim 1, characterized in that, The hook of the electric hoist is connected to the wire rope of the electric hoist via a flexible spring.

6. The rapid rescue device for people trapped in a straight ladder under a state of counterbalance as described in claim 1, characterized in that, The net weight of the electric hoist shall not exceed 5% of the weight of the elevator car.

7. The rapid rescue device for people trapped in a straight ladder under a state of gravity balance as described in claim 1, characterized in that, The electric hoist is installed on the lower beam of the elevator car via a mounting bracket, which is bolted or welded to the lower beam of the elevator car; the total weight of the facilities connected to the bottom of the elevator car is less than 50 kg.

8. The rapid rescue device for people trapped in a straight ladder under a state of counterbalance as described in claim 1, characterized in that, The control box is located on the exterior wall of the ground floor outside the elevator shaft.

9. The rapid rescue device for people trapped in a straight ladder under a state of counterbalance as described in claim 1, characterized in that, The ground anchor includes 2-6 sets of push-pull electromagnets and locking rods and locking frames that are matched with the push-pull electromagnets. These push-pull electromagnets and the locking rods and locking frames that are matched with the push-pull electromagnets are arranged around a center, which corresponds to the projection of the elevator car hook on the bottom surface of the elevator shaft when the elevator car is stationary.

10. The rapid rescue device for people trapped in a straight ladder under a state of counterbalance as described in claim 9, characterized in that, The hook of the electric hoist is a hollow sphere structure composed of multiple rings; an induction switch is provided inside the area enclosed by the push-pull electromagnet and the locking rod and locking frame that are matched with the push-pull electromagnet. When the hook enters the area, it is sensed by the induction switch, and each push-pull electromagnet pushes its matched locking rod to slide into the locking hole of the corresponding locking frame to lock the hook.

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