Air bag device, lift car with roof-rushing protection and elevator roof-rushing protection control method

Abstract

The invention relates to the technical field of elevators, and provides an air bag device, a lift car with the air bag device and a roof collision prevention control method of the lift car. The air bag device comprises a folding type air bag, a gas generator and a magnetic liquid soft bag, magnetic liquid is contained in the magnetic liquid soft bag, the magnetic liquid soft bag is arranged at an inlet of the folding type air bag, an outlet of the magnetic liquid soft bag is connected with the inlet of the folding type air bag, and the gas generator is connected with the inlet of the folding type air bag. The lift car comprises an air bag device, an electromagnetic array arranged on a suspended ceiling of a car body and a permanent magnet array arranged on a bottom plate of the car body, and a bidirectional repulsive magnetic field is formed. According to the elevator car, a better protection effect can be provided, collision energy is absorbed, rebound force is reduced, and acting force generated when passengers collide with the car wall or the car bottom is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of elevator technology, in particular to an airbag device for protecting passengers from roof impact when the car roof impacts, an elevator car with roof impact protection function provided with the airbag device, and an elevator roof impact protection control method for controlling the elevator car. BACKGROUND

[0002] With the development of high-rise buildings, elevators are being used more and more widely, and elevator safety is also being taken seriously. Current elevators use a variety of safety devices (such as safety clamps, buffers, limit switches, etc.) to ensure safe operation of the elevator and protect passengers in the event of an elevator malfunction.

[0003] In elevator operation, the most serious faults mainly include two kinds, one is overspeeding and falling, and the other is roof impact. For elevator overspeeding, the elevator provided by the prior art provides sufficient protection measures and has good protection effect. For elevator roof impact, although some protection measures are provided, the overall buffer or braking of the entire car is performed, and in this process, the passengers in the car are prone to directly hitting the car ceiling due to inertia, causing serious injury to the elevator passengers.

[0004] Therefore, elevator manufacturers also attempt to set a protective device on the top of the car to protect the head of the passenger in the event of a roof impact accident of the elevator, such as the Chinese invention patent with publication number CN114084772A, which discloses an elevator anti-roof impact device and method. When detecting a roof impact hazard of the elevator, a nitrogen generator is started, and nitrogen is filled into the airbag to protect the head of the human body. However, the scheme provided by the prior art for protecting the head of the passenger in the event of a roof impact of the elevator is often insufficient for passengers who are relatively tall and heavy. The airbag plays a certain buffering role, but cannot completely prevent the head from colliding with the ceiling, and may still cause some damage. At the same time, the energy absorption effect of the airbag is poor, and a rebound force is often generated to push the passenger to the car wall or car bottom, causing secondary damage. SUMMARY

[0005] Based on the problems existing in the prior art, the embodiments of the present application provide an airbag device for setting on an elevator car to provide better protection for the head of a passenger in the event of a roof impact of the elevator.

[0006] The airbag device provided by the embodiments of the present application includes a foldable airbag bag, a gas generator, and a magnetic liquid soft bag. The magnetic liquid soft bag contains magnetic liquid, the magnetic liquid soft bag is arranged at the inlet of the foldable airbag bag, the outlet of the magnetic liquid soft bag is connected to the inlet of the foldable airbag bag, and the gas generator is connected to the inlet of the foldable airbag bag.

[0007] The airbag device provided by the embodiment of the present application can hide the folded airbag bag on the elevator car, such as the ceiling of the car. When the danger of hitting the top occurs, the gas generator is started to generate a large amount of gas and fill into the folded airbag bag, and drive the magnetic liquid in the magnetic liquid soft bag into the folded airbag bag. The magnetic liquid forms a stress layer under the action of the electromagnetic field towards the direction of the airbag towards the bottom of the car. The head of the passenger in the car first contacts the stress layer, and the magnetized chain structure of the magnetic liquid is destroyed when it is impacted. However, the magnetic field can make the magnetic liquid move towards the bottom of the elevator car, thereby well absorbing the impact energy. Therefore, the airbag device provided by the present application can provide better protection effect when applied to the car as a top hitting protection device, and can absorb the impact energy and reduce the rebound force, thereby avoiding the impact force of the passenger hitting the car wall or the car bottom as much as possible.

[0008] Preferably, a gel layer is further included, which is attached to the magnetic liquid and located in the magnetic liquid soft bag.

[0009] Preferably, glass microspheres are further included, which are located in the magnetic liquid soft bag.

[0010] Preferably, a Laval nozzle is further included, and the gas generator is connected to the inlet of the folded airbag bag through the Laval nozzle.

[0011] The embodiment of the present application also provides a car with top hitting protection, which comprises a car body, the top of the car body is provided with an electromagnetic array, the bottom of the car body is provided with a permanent magnet array, and the electromagnetic array and the permanent magnet array form a bidirectional repulsion magnetic field.

[0012] A first containing space is arranged between the ceiling of the car body and the electromagnetic array, and the airbag device is arranged in the first containing space; the ceiling of the car body is provided with a first protection plate, the first end of the first protection plate is rotationally connected with the ceiling, the second end opposite to the first end of the first protection plate is provided with an electromagnetic lock, the electromagnetic lock is locked when powered on, and the connection between the first protection plate and the ceiling is disconnected when powered off.

[0013] A control system is arranged, which comprises an acceleration sensor, a distance sensor and a central processor, the central processor is signal connected with the acceleration sensor and the distance sensor respectively, and the central processor is signal connected with the electromagnetic array; the acceleration sensor is used for detecting the acceleration of the car and sending the detection data to the central processor, and the distance sensor is used for detecting the distance between the car and a preset position point and sending the detection data to the central processor; the central processor is used for receiving the detection data of the acceleration sensor and the distance sensor and controlling the electromagnetic array, the electromagnetic lock and the first gas generator to work according to the processing result.

[0014] A power supply system for providing power to the electromagnetic array, the electromagnetic lock, the gas generator, the central processor, the acceleration sensor and the distance sensor.

[0015] The car with the roof collision protection provided by the embodiment of the application is hiddenly arranged with the folding air bag on the ceiling. The hidden design reduces the occupation of the internal space of the car, thereby avoiding the influence on the normal use of the elevator and avoiding some negative psychological pressure on the passengers. When the central processor detects the roof collision risk of the elevator through the acceleration sensor and the distance sensor, the electromagnetic array and the permanent magnet array are controlled to generate a bidirectional repulsion magnetic field, and the electromagnetic lock is controlled to be powered off, so that the first protective plate is opened and the folding air bag is opened. The gas emitter generates a large amount of gas and fills into the folding air bag, and drives the magnetic liquid in the magnetic liquid soft bag into the folding air bag. The magnetic liquid forms a stress layer in the direction of the air bag towards the car bottom under the action of the bidirectional repulsion magnetic field. The head of the passenger in the car first contacts the stress layer, and the magnetization chain structure of the magnetic liquid is damaged when the magnetic liquid is impacted. However, the magnetic field can make the magnetic liquid move towards the bottom of the elevator car, thereby well absorbing the impact energy. Therefore, the air bag device provided by the application can provide better protection effect when applied to the car as a roof collision protection device, and can absorb the impact energy and reduce the rebound force, thereby avoiding the force of the passengers impacting the car wall or the car bottom as much as possible.

[0016] Preferably, a radar arranged on the ceiling is further included, the radar is used for detecting height data and position data of the passengers in the car and sending the height data and the position data to the central processor, and the central processor is used for controlling the output power of each array unit in the electromagnetic array according to the height data and the position data.

[0017] Preferably, a second containing space is arranged at the bottom of the sidewall of the car body, and the air bag device is arranged in the second containing space.

[0018] Preferably, a magnetic liquid recovery device is further included, the magnetic liquid recovery device is provided with a centrifugal machine and a permanent magnet filter screen, and the permanent magnet filter screen is connected to the outlet of the centrifugal machine.

[0019] The embodiment of the application further provides an elevator roof collision protection control method for preventing the roof collision of the car with the roof collision protection, and the method comprises the following steps:

[0020] S100, the central processor receives detection data of the acceleration sensor and the distance sensor, judges whether the car has a roof collision risk according to the detection data, if not, repeats step S100, otherwise, enters step S200;

[0021] S200, the central processor sends a control command to the electromagnetic lock, the gas generator and the electromagnetic array, controls the gas generator to generate gas, controls the electromagnetic lock to be powered off at the same time, so that the first protection plate rotates around the first end to open, and the folding airbag package is opened; the central processor controls the electromagnetic array to form a bidirectional repulsion magnetic field with the permanent magnetic array arranged at the bottom of the car body;

[0022] S300, the gas generated by the gas generator is output to the inlet of the folding airbag package through the Laval nozzle, impacts the magnetic liquid and the gel, and scatters the magnetic liquid and the gel into fine magnetic droplets, and at the same time, the glass microspheres are rushed into the folding airbag package;

[0023] S400, the bidirectional repulsion magnetic field repels the magnetic droplets to the direction of the car body bottom, and the glass microspheres also fall to the direction of the car body bottom under the action of gravity, and a stress layer composed of the magnetic liquid, the gel and the glass microspheres is formed at the position of the folding airbag package facing the car body bottom.

[0024] The elevator crash protection control method provided by the embodiment of the application detects whether the elevator has a crash danger through the acceleration sensor and the distance sensor. The electromagnetic array and the permanent magnetic array generate a bidirectional repulsion magnetic field, and the electromagnetic lock is powered off at the same time, so that the first protection plate is opened and the folding airbag package is opened. The gas emitter generates a large amount of gas and fills into the folding airbag package, and at the same time, the magnetic liquid in the magnetic liquid soft bag is driven into the folding airbag package. The magnetic liquid forms a stress layer in the direction of the airbag facing the car body bottom under the action of the bidirectional repulsion magnetic field. The head of the passenger in the car first contacts the stress layer, and when the magnetic liquid is impacted, the magnetized chain structure is destroyed, but the magnetic field makes the magnetic liquid have the action of moving to the car body bottom, so that the impact energy is well absorbed. Therefore, the airbag device provided by the application can provide better protection effect when it is applied to the car as a crash protection device, and can absorb the impact energy and reduce the rebound force, so as to avoid the force of the passenger impacting the car wall or the car bottom as much as possible.

[0025] Preferably, before step S100, the following step is further included: the radar detects the height and position data of the passenger entering the car, and sends the height data and position data to the central processor;

[0026] The central processor calculates the working current of each array unit in the electromagnetic array according to the height data and position data, and sends a control command to the electromagnetic array;

[0027] The electromagnetic array adjusts the working current of each array unit according to the control command sent by the central processor. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0029] Figure 1 For the opening of the folded air bag package, the elevator provided by the present application has a roof protection structure diagram;

[0030] Figure 2 For the folded air bag package, when the nitrogen gas and the magnetic liquid are injected, the magnetic liquid layer formed by the magnetic liquid on the folded air bag package under the action of the bidirectional repulsion electromagnetic field is shown in the diagram;

[0031] Figure 3 When the radar detects the passenger height data and position data, the array unit in the electromagnetic array generates different size currents to produce different force effects on the magnetic liquid layer, as shown in the diagram;

[0032] Figure 4 The flowchart of the elevator roof protection control method is shown in the diagram.

[0033] In the diagram, 100, car; 110, car body; 111, car roof; 112, car bottom; 113, car side wall; 114, first protection plate; 115, air bag storage bin; 120, folded air bag package; 121, magnetic liquid layer; 122, inflation layer; 130, electromagnetic array; 140, permanent magnet array; 150, laser range finder. DETAILED DESCRIPTION

[0034] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0035] It should be noted that the terms "first", "second", "symmetric", "array" and the like are only used for distinguishing description and position description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "symmetric" and the like can explicitly or implicitly include one or more of the features; similarly, for some features that are not limited in number by the words "two", "three" and the like, it should be noted that the features also belong to explicitly or implicitly including one or more feature numbers;

[0036] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "fixing" and the like should be understood in a broad sense; for example, it can be fixed connection, or detachable connection, or integral molding; it can be mechanical connection, it can be direct connection, it can be welding, it can be indirect connection through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the description and drawings in combination with specific circumstances.

[0037] The technical solutions of the present application will be described in detail below in combination with the drawings.

[0038] As shown in Figures 1 to 3 The present application provides an elevator system, which includes a complete system composed of a car 100, a traction motor system, an elevator shaft system, etc. The present application mainly improves the car 100 of the elevator, and the remaining parts which are not improved adopt the mature technical solutions provided by the existing elevator, which will not be described here.

[0039] The elevator system provided by the embodiments of the present application focuses on improving the car 100 and provides a car 100 with a roof protection function. The car includes a car body 110 and elevator doors, the car body 110 includes a car roof 111, a car bottom 112 and a car side wall 113. The components such as floor buttons and display panels are arranged on the car side wall 113 at the side of the elevator doors, and the exhaust fan and the electromagnetic array 130 are arranged on the car roof 111. The electromagnetic array 130 is composed of a plurality of array units, each array unit can correspond to an electromagnetic field area, and each array unit can be controlled by a control circuit to control the working current thereof, so as to control the size of the magnetic field generated thereby. A suspended ceiling is arranged on the upper part of the car body 110, and a suspended ceiling space is formed between the suspended ceiling and the car roof. The lighting system can be arranged on the suspended ceiling space, and the circuit can be arranged on the suspended ceiling space. A first accommodating space is further arranged in the suspended ceiling space, and is used for accommodating the air bag device. In a preferred embodiment, the air bag storage bin 115 is arranged in the first accommodating space, and is used for placing the folded air bag package 120. The embodiments of the present application further include a first protection plate 114, which is used for isolating the first accommodating space from the space in the car body 110 for passengers to stand. In the embodiments of the present application, the first protection plate 114 is arranged in a square shape, a rotating part is arranged at the first end of the first protection plate, which is used for connecting the first protection plate with the frame of the suspended ceiling and rotating the first protection plate around the frame of the suspended ceiling. The rotating part can be a hinge. It can also be other devices provided by the prior art for realizing the rotating connection of one part relative to another part, and the specific structure of the rotating part is not limited in the present application, which will not be described here. The second end of the first protection plate opposite to the first end is provided with an electromagnetic lock. In the embodiments of the present application, the specific composition and structure of the electromagnetic lock are not limited, and a mature electromagnetic lock provided by the prior art can be used. When the electromagnetic lock is connected to the circuit to continuously provide working current, the magnetic force generated thereby fixes the first protection plate and the frame of the suspended ceiling together, so as to isolate the first accommodating space from the main space of the car body. When the electromagnetic lock is powered off, the electromagnetic lock stops working, and the second end of the first protection plate is not lifted by the attracting force, and under the action of gravity, the first protection plate rotates around the rotating part at the first end, and the folded air bag package can be opened. In a preferred embodiment provided by the present application, a torsion spring is further arranged between the second end of the first protection plate and the suspended ceiling. When the first protection plate is connected to the frame of the suspended ceiling under the action of the electromagnetic lock, the second end of the first protection plate compresses the torsion spring. When the electromagnetic lock stops generating the magnetic field, the first protection plate can be opened under the action of the torsion spring. That is, the first protection plate is not only opened by gravity, but also has a better opening function. The air bag device is arranged in the first accommodating space.

[0040] The airbag device provided by the embodiment of the present application comprises a folding airbag bag 120, a gas generator and a magnetic liquid soft bag, the magnetic liquid soft bag is filled with magnetic liquid, the magnetic liquid soft bag is arranged at the inlet of the folding airbag bag, the outlet of the magnetic liquid soft bag is connected with the inlet of the folding airbag bag, and the gas generator is connected with the inlet of the folding airbag bag. In the embodiment of the present application, the gas generator is preferably a nitrogen gas generator.

[0041] The permanent magnet array 140 is arranged at the bottom of the compartment (i.e. the compartment bottom) and covered by the bottom plate. The permanent magnet array 140 comprises a plurality of permanent magnets, each of which generates a magnetic field, and together builds a permanent magnet array magnetic field at the compartment bottom. The permanent magnet array and the electromagnetic array at the compartment top form a bidirectional repulsion magnetic field, i.e. the magnetic field generated by the electromagnetic array has the same magnetic pole opposite to the magnetic pole of the permanent magnet array opposite to the magnetic pole of the electromagnetic array. In the preferred embodiment provided by the present application, the north pole (N pole) of the electromagnetic array faces the permanent magnet array, and the north pole (N pole) of the permanent magnet array faces the electromagnetic array.

[0042] The elevator car provided by the embodiments of the present application further comprises a control system, and the control system comprises a sensor module and a central controller. The sensor module is provided with at least an acceleration sensor and a distance sensor. The acceleration sensor is arranged on the car body, for example, on the car roof or on the car side wall. The acceleration sensor is connected to the central processor, and therefore, in a preferred embodiment, the acceleration sensor and the central processor are arranged together, for example, on the same circuit board. The acceleration sensor can adopt an accelerometer provided by the prior art applicable to an elevator car, for example, a three-axis MEMS acceleration sensor. The acceleration sensor sends detection data to the central processor. The distance sensor is arranged on the outer side wall of the car or on the car roof. The distance sensor adopts a laser range finder 150, measures the distance between the car and a preset position point, for example, the distance between the car and a positioning point arranged on the top of the elevator shaft, and sends detection data to the central processor. The central processor receives the detection data of the acceleration sensor and the distance sensor, and determines whether the car has a roof collision risk through calculation. In the embodiments of the present application, the central processor adopts a fuzzy algorithm to make a collision prediction. When the central processor determines that the car has a roof collision risk, a control command is sent to the electromagnetic array, the electromagnetic lock and the gas generating device, the electromagnetic array and the permanent magnet array are controlled to form a bidirectional repulsion magnetic field. At the same time, the electromagnetic lock is controlled to stop working, so that the first protective plate opens the first containing space, and the folding air bag pack can be stretched out from the first containing space to the ceiling of the car. The nitrogen generator is ignited, and a large amount of nitrogen gas can be rapidly generated by the decomposition of guanidine nitrate or other nitrogen heterocyclic compounds after ignition through a violent chemical reaction. Under the action of strong gas pressure, nitrogen gas rapidly enters the air bag through the inlet of the folding air bag pack, and in this process, the magnetic liquid in the magnetic liquid soft pack is driven into the air bag. The magnetic liquid in the air bag rapidly moves to the direction with the strongest magnetic field strength under the action of the bidirectional repulsion magnetic field. The magnetic liquid layer 121 is formed on the side of the air bag facing the car floor, and the other part filled with nitrogen gas forms the inflation layer 122. The magnetic liquid layer 121 will first meet the head collision of the passenger caused by inertia when the car collides with the roof. When the magnetic liquid layer 121 is impacted, the magnetized chain structure is destroyed, but the magnetic field will make the magnetic liquid move to the bottom of the elevator car, thereby well absorbing the impact energy. Therefore, the air bag device provided by the present application can provide better protection effect when it is applied to the car as a roof collision protection device, and can absorb the impact energy and reduce the rebound force, thereby avoiding the impact force of the passenger on the car wall or car floor as much as possible.

[0043] The car provided by the application further comprises a power supply system for providing power for the electromagnetic array, the electromagnetic lock, the gas generator, the central processor, the acceleration sensor and the distance sensor. The power supply system provided by the embodiment of the application obtains power through a power supply line connected to the car itself. In a preferred embodiment provided by the application, a backup power supply system can be arranged in the car, and the backup power supply system comprises a storage battery which can be connected to the power supply line of the car to be charged. When the car is powered off, the backup power supply system can be activated to provide power for the sensor module, the central processor, the electromagnetic array, the electromagnetic lock, the igniter and the lighting system.

[0044] The car 100 provided by the embodiment of the application forms a bidirectional repulsion magnetic field through the control of the electromagnetic array 130 and the permanent magnetic array 140. The bidirectional repulsion magnetic field can generate the strongest magnetic field at the middle position of the car, so that the magnetic liquid forms a magnetic liquid layer 121 in the direction of the car bottom to serve as the main force layer. When the magnetic liquid is subjected to an impact force and the magnetic chain is damaged, the magnetic liquid will try to restore to the bottom of the air bag, so that the magnetic liquid provides a force unloading effect to absorb the impact energy and reduce the rebound force.

[0045] In a preferred embodiment provided by the application, a gel layer is further included, which is attached to the magnetic liquid and located in the magnetic liquid soft bag. The gel layer is filled into the air bag together with the magnetic liquid by high-pressure gas, and the gel layer is attached to the magnetic liquid, so that the bidirectional repulsion magnetic field can arrange the gel together on the side of the folding air bag pack facing the car bottom when acting on the magnetic liquid. The gel will become hard when subjected to a shearing force. The magnetic liquid with the added gel has a better buffering effect and can provide better buffering and protection for the head impact of the passenger. In a further improved scheme provided by the application, glass microspheres are further included, which are located in the magnetic liquid soft bag. The glass microspheres can be blown into the air bag by nitrogen. The glass microspheres fall to the side of the folding air bag pack facing the car bottom under the action of gravity, and together with the magnetic liquid and the gel, form a force layer. The glass microspheres are vacuum beads which are broken to absorb energy in the case of impact. The kinetic energy under the action of human inertia can be further absorbed to further reduce the rebound force.

[0046] In a further preferred embodiment provided by the application, the airbag device further comprises a Laval nozzle, and the gas generator is connected to the inlet of the folded airbag package through the Laval nozzle. After the nitrogen generator is ignited, nitrogen gas is rapidly released. These nitrogen gas passes through the Laval nozzle to form high-speed gas flow. These high-speed gas flow will impact the magnetic liquid and disperse the magnetic liquid into fine droplets, like a spray, forming atomized magnetic liquid. Of course, the high-speed gas flow will also impact the gel layer to form gel droplets. The atomized magnetic liquid can be more evenly distributed with the gel droplets in the airbag, that is, the side of the folded airbag package facing the bottom of the compartment can form a layer of magnetic liquid, so that the magnetic liquid layer is more uniform, avoiding some areas without forming a magnetic liquid layer or the magnetic liquid layer being too thin, which limits the buffering effect. At the same time, the high-speed gas flow can also improve the effect on the glass microspheres, so that the glass microspheres can scatter to a larger range and be more evenly scattered in the airbag, so that most of the magnetic liquid layer can mix with the glass microspheres, improving the buffering effect and energy absorption effect of the magnetic liquid layer in each place.

[0047] The car provided by the embodiment of the application further comprises a radar arranged on the ceiling, the radar being configured to detect height data and position data of passengers in the car and send the height data and the position data to a central processor, and the central processor being configured to control output power of each array unit in the electromagnetic array according to the height data and the position data. The control of the electromagnetic unit on the magnetic liquid enables the magnetic liquid to form three levels of soft, medium and hard. After the airbag is inflated, the contact surface of the airbag formed is at the same height to ensure that the head and upper body of the passenger can be covered when the roof is hit, thereby providing comprehensive protection. However, the distance between different height people and the contact surface of the airbag is different, resulting in different impact forces on the airbag. By setting different levels of stress hardness, different impact forces can be coped with.

[0048] Soft: suitable for children or shorter passengers. When the roof is hit, the head of the child or the shorter person is relatively low, and the body inertia is small, so the buffering force does not need to be too large. Therefore, the system is set to "soft" mode, the hardness of the magnetic liquid layer is reduced, the buffering force is moderate, and discomfort caused by excessive buffering force is avoided. Although the height of the airbag remains the same, the hardness of the magnetic liquid layer is reduced, which can provide safer and more comfortable protection for these passengers.

[0049] Medium: suitable for people of ordinary height. This is the standard setting, suitable for most adults. The body inertia of adults is moderate, so a moderate buffering force is provided. By adjusting the hardness of the magnetic liquid layer to a moderate level, the passenger can be effectively protected without feeling too soft or too hard. The height of the airbag remains the same, but the hardness of the magnetic liquid layer is moderate, ensuring that appropriate buffering is provided when the roof is hit.

[0050] Hard: Suitable for taller people. For taller people, the head position is higher, and the body inertia is larger. If the buffer force is not enough, it may be injured when hitting the top. Therefore, for taller people, the system will be adjusted to "hard" mode, increasing the hardness of the magnetic liquid layer to provide stronger buffer force to ensure safety. Although the height of the airbag remains the same, by increasing the hardness of the magnetic liquid layer, the larger inertia of taller people can be effectively dealt with, providing stronger protection.

[0051] To achieve magnetic liquid layers of different hardness, the height data of the occupant is obtained by radar, as well as the array element position in the electromagnetic array corresponding to the occupant's standing position. The central processor will adjust the current size of the array elements according to the height of the occupant. Larger current can increase the magnetic field force of the corresponding array elements, making the magnetic liquid have higher hardness, while smaller current reduces the magnetic force generated by the array elements, making the magnetic liquid layer softer. By adjusting the hardness of the magnetic liquid layer, the system can provide personalized buffer force according to the height and body inertia of the passenger. Taller people need stronger buffer force to ensure safety due to their larger body inertia, so the system will accordingly increase the hardness of the magnetic liquid layer. For example, if there are two people in the car, one in the middle position and one in the edge position, the heights of the two people are different, such as the person standing in the edge position is shorter, while the person standing in the middle position is taller. The control system will adjust the magnetic field size of the array elements in the middle and edge positions respectively, so that the working current of the array elements in the edge position is smaller, generating a smaller magnetic field to provide a softer magnetic liquid layer, while the working current of the array elements in the middle position is larger, generating a larger magnetic field to provide a harder magnetic liquid layer, to adapt to the height requirements of different passengers.

[0052] In a preferred embodiment of the present application, a second accommodating space is arranged at the bottom of the car body side wall, and an air bag device is arranged in the second accommodating space. A second protective plate can be arranged between the second accommodating space and the main body space inside the car, the upper part of the second protective plate is rotationally connected with the car side wall, and the lower part of the second protective plate can be clamped on the car side wall through slight deformation. The gas generating device of the air bag device is connected with the central processor and controlled by the central processor. Whether the passenger inside the car collides with the car roof is detected by a radar, and when the collision is detected, the gas generator of the air bag device arranged in the second accommodating space is ignited to generate a large amount of gas, such as nitrogen, in a short time. The nitrogen is filled into the folding air bag bag, so that the folding air bag bag impacts the second protective plate, the second protective plate rotates around the rotating shaft, so that the folding air bag bag can extend out of the second accommodating space. The nitrogen simultaneously generates a high-speed airflow through the Laval nozzle, and the magnetic liquid and the gel are atomized and filled into the folding air bag bag. The magnetic liquid and the gel attached to the magnetic liquid form a magnetic liquid stress layer under the action of the bidirectional repulsion magnetic field in the direction of the air bag bag facing the car roof. Therefore, when the human body collides with the air bag located on the car roof and the speed is reduced to zero, the human body will fall to the car bottom under the action of gravity, and the air bag device arranged at the bottom of the car side wall can form an air cushion to provide a buffer for the human body falling. The magnetic liquid layer can enhance the buffering effect under the action of the bidirectional repulsion magnetic field. The principle of action can be referred to the description of the air bag device on the car roof, which will not be described here.

[0053] The car with roof collision protection provided by the embodiment of the present application further includes a magnetic liquid recovery device, the magnetic liquid recovery device is provided with a centrifuge and a permanent magnetic filter screen, and the permanent magnetic filter screen is connected with the outlet of the centrifuge. The magnetic liquid recovery device for recovering the magnetic liquid in the air bag arranged on the car roof is arranged on a slide rail, and the slide rail is installed on the outside of the top of the car body. The magnetic liquid recovery device can move along the slide rail. By moving the magnetic liquid recovery device, the magnetic liquid recovery device can be close to the magnetic liquid outlet of the folding air bag bag. By changing the magnetic field polarity of the electromagnetic array, the magnetic powder and gel material in the magnetic liquid layer originally used for buffering can be attracted back to the magnetic liquid recovery device. The magnetic liquid has magnetism and can be attracted by the magnetic field, so as to drive the gel and glass microspheres (broken and intact) to flow together. After use, part of the glass microspheres will be broken, and part will remain intact. These glass microspheres (whether broken or intact) need to be recovered and separated, so as to empty the magnetic liquid layer when the air bag is restored, and ensure that the air bag can be smoothly contracted and restored to the original state. And the gas in the air bag is extracted by the air extraction device, so that the folding air bag bag returns to the folded state, and can continue to be used after replacing the gas generating device.

[0054] Three-phase separation and recovery are realized in the magnetic liquid recovery device:

[0055] Separation process:

[0056] High-speed rotation of the centrifuge cylinder: When the centrifuge cylinder is rotating at high speed, the glass microspheres (including broken and intact ones) will be thrown to the outside due to their greater density, forming a separate collection area. Broken glass microsphere debris and intact glass microspheres will be distributed in different positions due to differences in density and shape. Density and shape differences: Broken glass microsphere debris is usually smaller and more irregular, and will be closer to the outside of the centrifuge cylinder; while intact glass microspheres are relatively larger and more regular, and will be distributed slightly inside. By adjusting the centrifuge speed and time, broken glass microsphere debris and intact glass microspheres can be separated and collected.

[0057] Magnetic separation: Permanent magnet filter adsorbs iron powder: Permanent magnet filter can adsorb magnetic powder, further separating the magnetic powder. Through the action of magnetic force, the magnetic powder can be completely separated from other substances. Based on centrifugal separation, the magnetic powder can be more effectively separated to ensure the completeness of the separation process.

[0058] A magnetic liquid recovery device can also be provided at the bottom of the compartment side wall, which can be pulled out of the compartment side wall manually by the operator and classified and recovered by the operator. The magnetic liquid is recovered when the folding air bag pack is recovered. The folding air bag pack at the bottom of the compartment body can also realize the separation and recovery of the magnetic liquid through the self-provided magnetic liquid recovery device, without the need for separate setting.

[0059] The application also provides an elevator crash protection control method, as shown in the following. Figure 4 The method is used to control the crash protection of the car with the above-mentioned crash protection. The method comprises the following steps:

[0060] S100, the central processor receives the detection data of the acceleration sensor and the distance sensor, and judges whether the car has a risk of crashing according to the detection data. If not, repeat step S100, otherwise, go to step S200;

[0061] S200, the central processor sends a control command to the electromagnetic lock, the gas generator and the electromagnetic array, controls the gas generator to generate gas, controls the electromagnetic lock to be powered off at the same time, so that the first protection plate rotates around its first end to open, and the folding air bag pack is opened; the central processor controls the electromagnetic array and the permanent magnet array arranged at the bottom of the car body to form a bidirectional repulsive magnetic field;

[0062] S300, the gas generated by the gas generator is output to the inlet of the folding air bag pack through the Laval nozzle, impacting the magnetic liquid and the gel, and scattering the magnetic liquid and the gel into fine magnetic droplets, while the glass microspheres are impacted into the folding air bag pack;

[0063] S400, the bidirectional repulsion magnetic field repels the magnetic droplet to the direction of the car bottom, and the glass microspheres also fall to the direction of the car bottom under the action of gravity, forming a stress layer composed of the magnetic liquid, the gel and the glass microspheres at the position of the folded air bag cover facing the car bottom.

[0064] Before step S100, the following steps are further included: the radar detects the height and position data of the passenger entering the car, and sends the height data and position data to the central processor;

[0065] The central processor calculates the working current of each array unit in the electromagnetic array according to the height data and position data, and sends a control command to the electromagnetic array;

[0066] The electromagnetic array adjusts the working current of each array unit according to the control command sent by the central processor.

[0067] Meanwhile, after step S400, step S500 is further included: the magnetic liquid recovery device is controlled to move to the side of the folded air bag cover through the slide rail, the electromagnetic array is controlled to generate an opposite magnetic field to drive the magnetic liquid into the magnetic liquid recovery device, the magnetic liquid recovery device is started to separate the magnetic powder, the gel and the glass microspheres, and the air pump is started to separate the gas in the folded air bag cover, so that the folded air bag cover returns to the original state. The maintenance personnel can replace the gas generating device, then fold the folded air bag cover and place it in the first containing space or the second containing space. Then the electromagnetic lock is reset through the reset device. The air bag device is recovered, so that the air bag device can be reused.

[0068] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of various changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An airbag device, characterized in that: The invention comprises a foldable airbag package, a gas generator and a magnetic fluid soft bag. The magnetic fluid soft bag is filled with magnetic fluid, is arranged at the inlet of the foldable airbag package, and the outlet of the magnetic fluid soft bag is connected to the inlet of the foldable airbag package. The gas generator is connected to the inlet of the foldable airbag package.

2. The airbag device according to claim 1, wherein: It also includes a gel layer, which is attached to the magnetic fluid and located in the magnetic fluid soft bag.

3. The airbag device according to claim 2, wherein: It also includes glass microspheres, which are located in the magnetic fluid soft bag.

4. The airbag device according to any one of claims 1 to 3, characterized in that: A Laval nozzle is also included, and the gas generator is connected to the inlet of the foldable airbag package through the Laval nozzle.

5. A car with roof impact protection, comprising a car body, characterized in that: An electromagnetic array is provided on the top of the compartment, and a permanent magnetic array is provided on the bottom of the compartment, wherein the electromagnetic array and the permanent magnetic array form a bidirectional repulsive magnetic field; A first accommodating space is provided between the ceiling of the car body and the electromagnetic array, and the airbag device according to any one of claims 1 to 4 is further provided, the airbag device being provided in the first accommodating space; a first protective plate is provided on the ceiling of the car, a first end of the first protective plate is rotatably connected to the ceiling, and an electromagnetic lock is provided on a second end opposite to the first end of the first protective plate, the electromagnetic lock locking the first protective plate when power is applied and disconnecting the first protective plate from the ceiling when power is removed; A control system comprising an acceleration sensor, a distance sensor, and a central processing unit (CPU); the CPU being connected to the acceleration sensor and the distance sensor signals, respectively, and further connected to the electromagnetic array signal; the acceleration sensor being used to detect the acceleration of the car and send the detection data to the CPU; the distance sensor being used to detect the distance between the car and a preset position point and send the detection data to the CPU; the CPU being used to receive the detection data from the acceleration sensor and the distance sensor, and controlling the operation of the electromagnetic array, the electromagnetic lock, and the first gas generator according to the processing results; A power supply system is used to provide electrical energy to the electromagnetic array, electromagnetic lock, gas generator, central processing unit, acceleration sensor and distance sensor.

6. The car with roof impact protection according to claim 5, characterized in that: It also includes a radar installed on the ceiling, which is used to detect the height data and position data of passengers in the car and send the height data and position data to the central processing unit. The central processing unit is used to control the output power of each array unit in the electromagnetic array based on the height data and position data.

7. The car with roof impact protection according to claim 6, characterized in that: A second accommodating space is provided at the bottom of the side wall of the compartment, and an airbag device as described in any one of claims 1 to 4 is provided in the second accommodating space.

8. The car with roof impact protection according to claim 7, characterized in that: It also includes a magnetic liquid recovery device, which is provided with a centrifuge and a permanent magnetic filter, and the permanent magnetic filter is connected to the outlet of the centrifuge.

9. An elevator top-rush protection control method, characterized in that: The method for a car with roof impact protection as claimed in any one of claims 5 to 8 comprises the following steps: S100, the central processing unit receives detection data from the acceleration sensor and the distance sensor, and determines whether there is a risk of the car hitting the roof based on the detection data. If not, repeat step S100, otherwise, proceed to step S200; S200: The central processing unit sends a control command to the electromagnetic lock, the gas generator, and the electromagnetic array, controlling the gas generator to generate gas and simultaneously controlling the electromagnetic lock to de-energize, causing the first protective plate to rotate open about its first end and deploy the foldable airbag package; the central processing unit controls the electromagnetic array to form a bidirectional repulsive magnetic field with the permanent magnetic array provided at the bottom of the vehicle body; S300: The gas generated by the gas generator is output to the inlet of the foldable airbag package through the Laval nozzle, impacting the magnetic fluid and gel, breaking the magnetic fluid and gel into fine magnetic droplets, and at the same time flushing the glass microspheres into the foldable airbag package; S400. A bidirectional repulsive magnetic field repels the magnetic droplet toward the bottom of the car, and the glass microspheres also fall toward the bottom of the car under the action of gravity, forming a stress-bearing layer composed of magnetic liquid, gel, and glass microspheres at the position where the foldable airbag package faces the bottom of the car.

10. The method according to claim 9, wherein Before step S100, the method further includes the following steps: detecting the height data and position data of the passenger entering the car by a radar, and sending the height data and position data to a central processor; The central processing unit calculates the operating current of each corresponding array unit in the electromagnetic array according to the height data and the position data, and sends a control command to the electromagnetic array; The electromagnetic array adjusts the operating current of each array unit according to the control command sent by the central processing unit.

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