CN216549103U

CN216549103U - Rotary anti-falling device

Info

Publication number: CN216549103U
Application number: CN202123072169.2U
Authority: CN
Inventors: 龚伟国
Original assignee: Ruian Keda Electronic Appliance Manufacturing Co ltd
Current assignee: Ruian Keda Electronic Appliance Manufacturing Co ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-05-17
Anticipated expiration: 2031-12-08

Abstract

The utility model provides a rotation anti-falling device, includes the base, fixes the driver part who sets up in base one end, sets up the anti-falling part on the base, its characterized in that: prevent weighing down the part and be the lever spare, the position that lever spare one end is close to the base is articulated with the base, is equipped with the stop part that restricts lever spare rotation stroke on the base, be connected with elastic transmission spare between drive component and the lever spare, be equipped with between lever spare and the base and can make the lever spare rotate the piece that resets of reseing towards being close to the base direction. The utility model has smart structure, does not need a driving component to respond when the falling prevention action is carried out, can work under the condition that the driving source fails, such as power failure and the like, and has higher safety.

Description

Rotary anti-falling device

Technical Field

The utility model relates to the technical field of elevator equipment, in particular to a rotary type anti-falling device.

Background

With the development of technology, elevators become an important tool in daily life of people gradually, people or objects can be carried to be higher, great convenience is brought to life, and modern elevators mainly compriseTraction machineA guide rail,CounterweightThe safety system is especially important, and the safety system protects the life safety of goods and passengers, and the anti-falling device is an important part in the safety system. In the prior art, the anti-falling system mainly comprises an anti-falling device and an anti-falling clamping table, the anti-falling device is arranged at four corners of the bottom of the elevator cargo carrying platform, the anti-falling clamping table is arranged on a guide rail, and the anti-falling device can extend out or retract back along the horizontal directionAnd a power source for driving the bearing shaft to stretch and retract.

Publication number "CN 212374651U" discloses a fall arrester and fall arrest system for an elevator, wherein the fall arrester includes: the pull-push type electromagnet comprises an electromagnet body and a movable iron core which is positioned at one end of the electromagnet body and can move along the axial direction of the electromagnet body, and the movable iron core is a telescopic shaft of the anti-falling device; the telescopic shaft end part is fixed with a supporting seat, the elevator shaft wall of the elevator is fixed with an anti-falling supporting structure, the anti-falling supporting structure comprises an apron arranged horizontally, and one side of the supporting seat departing from the mounting seat is a plane matched with the surface of the apron. In addition, publication number "CN 213445682U" discloses an elevator safety hook, elevator safety hook includes mounting panel, bearing seat, bearing bar, cylinder, signal switch, solenoid valve and air pump, the mounting panel is installed in elevator car bottom, bearing seat and cylinder connect in the same side of mounting panel, the bearing seat is offered along the horizontal direction and is used for supplying the perforation that the bearing bar removed, the piston rod of cylinder with the bearing bar links to each other in order to drive the bearing bar stretches out perforation card is gone into in the elevator track or is got into from the elevator track in the perforation, the air pump pass through the solenoid valve with the cylinder links to each other. The elevator falling protector realizes the movement of the bearing rod through the cylinder, the electromagnetic valve and the air pump.

The two anti-falling devices are provided with the telescopic shafts or the bearing rods with bearing capacity, and when the elevator runs upwards, the telescopic shafts or the bearing rods are in a retracting state, so that the running of the elevator cannot be influenced. When the elevator falls, the telescopic shaft with the bearing capacity or the bearing rod is driven to extend out by driving components such as an air cylinder, an electromagnet and the like, and the falling of the elevator is stopped by the falling prevention clamping platform arranged on the elevator guide rail, namely the falling prevention supporting structure or the hole of the elevator track.

However, if a power failure or air leakage occurs in the cylinder during the operation of the elevator, that is, if the driving member fails, the above-mentioned fall preventing device cannot perform the fall preventing function, and the personnel and equipment in the elevator are still in danger. Simply keeping the telescopic shaft or the load-bearing bar extended will affect the upward movement of the elevator. Therefore, how to still exert the anti-falling function to ensure the safety of personnel and equipment under the condition of failure and failure of the driving part is a difficult problem to overcome.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a rotary anti-falling device, which has a skillful structure, does not need a driving part to respond when performing anti-falling action, thoroughly solves the problems in the prior art, and has higher safety compared with the traditional anti-falling device provided with a telescopic rod.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a rotation anti-falling device, includes the base, fixes the driver part who sets up in base one end, driver part is connected with anti-falling parts, its characterized in that: the anti-falling component comprises a lever component, one end of the lever component is hinged to the base at a position close to the base, the fulcrum of the lever component is a hinged center of the lever component and the base, the other end of the lever component is a bearing part, the bearing part extends towards the direction far away from the driving component and extends out of one end of the base, and a blocking part for limiting the rotation stroke of the lever component is arranged on the base.

By adopting the technical scheme, the falling prevention function can be realized under the condition that the falling prevention device does not need any mechanical force provided by the driving part, and the safety is further improved. Firstly, the anti-falling device is arranged at the four corners of the bottom of the elevator. Because the anti-falling component is a lever component, one end of the lever component is hinged with the base at a position close to the base, and the fulcrum of the lever component is a hinge center of the lever component and the base. The lever member can thus be rotated about the hinge center. And prevent to fall to be connected between part and the driver part, promptly the lever spare is connected with the driver part, and the driver part is fixed in the base, therefore the lever spare can be supported by drive assembly and avoid taking place to rotate under the action of lever spare self gravity. Because the other end of the anti-falling component is a bearing part, the bearing part extends towards the direction away from the driving component and extends out of one end of the base, so that the bearing part can be abutted against an anti-falling clamping platform arranged on an external guide rail. If the elevator needs to be lifted normally, only the driving part needs to work to generate driving force, and the lever part is pulled to rotate for a certain angle until the lever part does not interfere with an external anti-falling clamping table.

When the elevator falls unexpectedly, when the lower end of the bearing part abuts against the external anti-falling clamping table, under the action of gravity of the elevator, the bearing part can rotate around the hinge center towards the direction close to the base, the lever part rotates at the moment, if the lever part is arranged, the rotation stroke is too large, the bearing part is easily separated from the external anti-falling clamping table, and the elevator has the possibility of continuously falling. The blocking part can be one end of the base and can also be arranged on the rotating path of the lever piece. At the moment, the lever member is limited by the blocking part to rotate, and the bearing part is extruded by the external anti-falling clamping platform to bear the whole weight of the elevator, so that the elevator stops on the anti-falling clamping platform on the next layer. Therefore, when the elevator descends, the anti-falling device does not need to start the driving part when the anti-falling device plays an anti-falling function, can work under the condition that the driving part fails such as power failure and the like, and has higher safety compared with the traditional anti-falling device with the telescopic rod.

The rotary anti-falling device can be further provided with: the anti-falling component comprises a plurality of groups of lever members which are arranged oppositely, the fulcrums of the lever members are positioned on the same straight line, and a plurality of connecting pieces are arranged between the adjacent lever members.

By adopting the technical scheme, the multiple groups of lever pieces are arranged, so that the bearing capacity of the anti-falling device is improved, the failure of the whole anti-falling device caused by the deformation of a single lever piece is avoided, and the safety and the stability are further improved. Because the fulcrums of the lever members are positioned on the same straight line, and the connecting pieces are arranged between the adjacent lever members, the lever members can move synchronously, and the problem that the anti-falling effect is poor or even the anti-falling device is damaged due to the fact that the lever members rotate asynchronously is avoided.

The rotary anti-falling device can be further provided with: an elastic transmission part is connected between the lever part and the driving part, and a reset part which can enable the bearing part to rotate towards the direction close to the base is connected between the lever part and the base.

By adopting the technical scheme, the lever piece can be reset without the driving part, and the working time of the driving part is reduced. If not reset, when the elevator rose, need drive assembly pulling lever spare to rotate certain angle and take place to interfere in order to avoid preventing weighing down the ka tai with the outside, and when lever spare reset, need again promote lever spare through drive assembly and change back original position for drive assembly need frequently start, influences life. Because be connected with between lever spare and the base and can make bearing part towards being close to the base direction pivoted piece that resets, simultaneously, be equipped with the elastic transmission spare between lever spare and the driver part, reset through setting up and make lever spare can rotate towards being close to the barrier part direction under no exogenic action, until being blockked by the barrier part, or with the lever spare self gravity balanced state after stall. Wherein, the elastic transmission part can adopt extension spring for be flexible connection between driver part and the anti-falling part, when driver part needs the during operation, the impact in the twinkling of an eye of the drive power of production is great, and extension spring is tensile state this moment, and the elasticity of production plays certain cushioning effect, can avoid rigid impact, avoids damaging driver part or anti-falling part, can prolong anti-falling device life. When the elevator ascends, the upper end of the bearing part of the lever part is contacted with the lower end of the anti-falling clamping table and is extruded, the upper end of the bearing part of the lever part is acted by external force at the moment, the lever part rotates towards the direction far away from the blocking part, after the elevator ascends to a certain height, the lever part is not extruded by the anti-falling clamping table any more, under the action of the resetting part, the anti-falling part rotates towards the direction close to the blocking part until being blocked by the blocking part, or stops rotating with the self gravity balance state of the lever part, and therefore resetting is achieved. Therefore, when the elevator ascends, the elevator can ascend normally without response of the driving part, the working time of the driving part is reduced, and the service life of the driving part is prolonged.

The rotary anti-falling device can be further provided with: the reset piece is an extension spring, the joint of the extension spring and the base is arranged on one side, close to the end part of the base, of the hinged center of the lever piece and the base, and the joint of the extension spring and the lever piece is far away from the base.

By adopting the technical scheme, because the reset piece is the extension spring, the production cost can be reduced, and the installation is convenient. Because the piece that resets is extension spring, and the junction of extension spring and base sets up in one side that the articulated center of lever spare and base is close to the base tip, when bearing portion received the exogenic action and rotates along keeping away from the stopper direction, extension spring was in tensile state this moment, produced elasticity to the lever spare. When the bearing part is not acted by external force any more, the elastic force can urge the bearing part to rotate towards the direction close to the blocking part to realize reset. Because the base setting is kept away from to the junction of extension spring and lever spare, lead to the junction of extension spring and lever spare to keep away from the fulcrum of lever spare, according to lever principle, the junction of extension spring and lever spare is far away from the fulcrum of lever spare more, and the power that makes lever spare reset needs is littleer, if the extension spring produce at elasticity certain and under the unchangeable condition of lever spare gravity, the speed of resetting of lever spare is faster.

The rotary anti-falling device can be further provided with: the lever member is plate-shaped.

By adopting the technical scheme, the lever piece is plate-shaped, so that the plate-shaped material is convenient to process and can be made into various shapes, the production cost can be reduced, and the lever piece which can be made into various shapes can adapt to different occasions.

The rotary anti-falling device can be further provided with: the normal direction of the lever piece is perpendicular to the normal direction of the base.

By adopting the technical scheme, when the elevator stops falling, the bearing part of the rotary plate needs to bear the weight of the elevator, the upper end of the bearing part is extruded by the blocking part, the lower end of the bearing part is extruded by the external anti-falling clamping table, and the normal direction of the rotary plate is perpendicular to the normal direction of the base, so that the upper end stress point of the bearing part of the rotary plate is far away from the lower end stress point, and therefore, the rotary plate is not easy to break or deform.

The rotary anti-falling device can be further provided with: and a contact inclined plane is arranged on one side of the bearing part close to the base.

By adopting the technical scheme, because the bearing part is provided with the contact inclined plane on one side close to the base, the contact inclined plane can be contacted with the external anti-falling clamping table when the elevator ascends, the contact inclined plane can reduce the friction between the contact inclined plane and the external anti-falling clamping table, the lever part is prevented from being worn and torn between the anti-falling clamping tables, the lever part can rotate more smoothly, and the influence on the elevator ascending is reduced.

The rotary anti-falling device can be further provided with: the stop part includes spacing back shaft, spacing back shaft sets up in bearing part when rotating towards being close to the base direction on the bearing part rotates the route, spacing back shaft is connected with bearing part upper end intermittent type nature conflict, be equipped with the concave surface with spacing back shaft adaptation on the bearing part.

By adopting the technical scheme, the blocking part comprises the limiting supporting shaft, so that the weight can be reduced, and meanwhile, the installation is convenient. Because spacing back shaft sets up on the rotation path of bearing part when the bearing part rotates towards being close to the base direction, promptly when the elevator meets unexpected whereabouts, when bearing part and outside anti-falling card platform butt, under elevator action of gravity, bearing part can rotate towards being close to the base direction around articulated center and form the rotation path of bearing part, spacing back shaft is fixed to be set up on this rotation path, in order to realize the rotation stroke of restriction anti-falling parts, avoid preventing that anti-falling parts turned angle is too big and make bearing part break away from anti-falling card platform, and the upper end and the spacing back shaft of bearing part are contradicted and are connected, because be equipped with the concave surface with spacing back shaft adaptation on the bearing part at this moment, consequently when bearing part and spacing back shaft conflict are connected, the wearing and tearing of the two are little, be favorable to increase of service life.

The rotary anti-falling device can be further provided with: the driving component comprises a traction electromagnet fixedly mounted on the base, the traction electromagnet comprises an electromagnet main body and an iron core, a control box is arranged on the electromagnet main body, a return spring is arranged between the iron core and the electromagnet main body, and the driving component is connected through an iron core lever piece.

By adopting the technical scheme, as the driving part comprises the traction electromagnet, when the traction electromagnet is electrified, the iron core is stressed to pull the lever part to rotate, so that the interference between the bearing part of the lever part and the external anti-falling clamping table is avoided, and the elevator can freely rise or descend. The return spring is in a compression state, when the traction electromagnet is powered off, the iron core loses force function, and the iron core resets under the action of the return spring, so that the iron core is pulled in a reciprocating manner. When the elevator stops on the external anti-falling clamping table, the elevator can continuously move downwards only by controlling the elevator to rise for a certain distance, electrifying the traction electromagnet and pulling the lever member to rotate so that the bearing part of the lever member does not interfere with the external anti-falling clamping table. The pull-in force of the traction electromagnet is large, so that the anti-falling component can be quickly pulled to rotate, and the state switching of the anti-falling device is quicker. The traction electromagnet can adjust the parameters of the traction electromagnet through the control box, so that the holding current of the traction electromagnet is reduced, and energy conservation is realized.

The rotary anti-falling device can be further provided with: the traction electromagnet further comprises a tail extension rod, one end of the tail extension rod is coaxially connected with the iron core, one end of the tail extension rod extends to the outer side of the electromagnet main body, and a signal switch is arranged on the base corresponding to the tail extension rod.

By adopting the technical scheme, one end of the tail extension rod of the traction electromagnet is coaxially connected with the iron core, and the tail extension rod can move along with the iron core. Because the signal switch is fixedly connected with the base at the position corresponding to the tail extension rod, when the traction electromagnet is electrified to attract the iron core, the iron core moves to pull the lever member, the tail extension rod moves towards the direction close to the signal switch at the moment, when the lever member rotates to a proper angle, the tail extension rod triggers the signal switch, the signal switch generates a signal and feeds the signal back to the elevator control system, and the elevator control system can perform next action according to the current signal, so that the realization of automation, intellectualization and remote control is facilitated.

The utility model has the beneficial effects that: a rotary anti-falling device is ingenious in structure, does not need a driving part to respond when falling prevention is carried out, solves the problems in the prior art, and has very high safety. Meanwhile, the normal ascending of the elevator cannot be influenced without the response of the driving part in the ascending process, the working time of the driving part is shortened, and the service life of the driving part is prolonged.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Drawings

Fig. 1 is a schematic structural view of a base of a first embodiment of the present invention facing upward;

FIG. 2 is a schematic view of a first embodiment of the present invention with a base facing downward;

FIG. 3 is a partial cross-sectional view of a first embodiment of the present invention;

FIG. 4 is a schematic view of a second embodiment of the present invention with a base facing upward;

FIG. 5 is a schematic view of a second embodiment of the present invention with a base facing downward;

FIG. 6 is a schematic view of the fall arrest member according to a first embodiment of the present invention;

FIG. 7 is a schematic view of the fall arrest member of a second embodiment of the present invention;

FIG. 8 is a diagram illustrating a force-driven rotation of the lever member according to the first or second embodiment;

fig. 9 is a schematic view of the traction electromagnet according to the first or second embodiment in an operating state;

FIG. 10 is a schematic view of the first or second embodiment before contact with an external fall arrest block;

FIG. 11 is a schematic view of the contact between the first embodiment or the second embodiment and an external anti-falling clamping platform in an ascending state of the elevator;

fig. 12 is a schematic view of the elevator descending in the working state of the traction electromagnet according to the first embodiment or the second embodiment;

fig. 13 is a schematic diagram of the fall arrest function of the first or second embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows: as shown in fig. 1, fig. 2, fig. 3, fig. 6, including base 1, the fixed drive unit 2 that sets up in base one end, drive unit 2 is connected with prevents weighing down the part, prevents weighing down the part and includes the relative lever piece 3 that sets up of a plurality of groups, the fulcrum 31 of lever piece 3 is the hinge center of lever piece 3 and base department 1, the 3 other end of lever piece is bearing part 32, bearing part 32 extends and stretches out base 1 one end setting towards the direction of keeping away from drive unit 2, be equipped with the stopper 7 of restriction lever piece 3 rotation stroke on the base 1. The fulcrums 31 of the lever members 3 are positioned on the same straight line, one end face, far away from the base 1, of the bearing part 32 of each lever member 3 is positioned on the same plane, and a plurality of connecting pieces 33 are arranged between the adjacent lever members 3. And one end of the lever member 3 is hinged with the base 1 at a position close to the base 1. Wherein, the lever member 3 is plate-shaped, which is convenient for processing. The normal direction of the lever member 3 is perpendicular to the normal direction of the base 1. An elastic transmission part 4 is connected between the lever part 3 and the driving part 2, a reset part 5 which can enable the bearing part 32 to rotate towards the direction close to the base 1 is connected between the lever part 3 and the base 1, and a contact inclined surface 321 is arranged on one side of the bearing part 32 close to the base 1. Wherein, the piece that resets 5 is extension spring, and extension spring and base 1's junction sets up in one side that the articulated center of lever piece 3 and base 1 is close to base 1 tip, extension spring and lever piece 3's junction keep away from base 1 and sets up. The elastic transmission member 4 is an extension spring. The stop part 7 includes spacing back shaft 71, spacing back shaft 71 sets up in the rotation route of bearing part 32 when bearing part 32 rotates towards being close to base 1 direction, spacing back shaft 71 is connected with bearing part 32 upper end intermittent type nature conflict, bearing part 32 and spacing back shaft 71 ground contact be equipped with the concave surface 322 of spacing back shaft 11 adaptation. Drive assembly 2 includes traction electromagnet 21 of fixed mounting on base 1, traction electromagnet 21 includes electro-magnet main part 211 and iron core 212, be equipped with control box 213 on the electro-magnet main part 211, be equipped with return spring 214 between iron core 212 and the electro-magnet main part 211, drive assembly 2 passes through iron core 212 and is connected with lever piece 3. The traction electromagnet 21 further comprises a tail extension rod 22, one end of the tail extension rod 22 is coaxially connected with the iron core 212, the other end of the tail extension rod 22 extends to the outer side of the electromagnet main body 211, and a signal switch 6 is arranged on the base 1 and corresponds to the tail extension rod 22.

Example two: compared with the first embodiment, the rotary type anti-falling device shown in the figures 4, 5 and 7 has the anti-falling component which is a single lever component, and the rest parts are the same as the first embodiment.

The working principle of the first embodiment is substantially the same as that of the second embodiment, and the working principle is as follows:

fig. 10 is a schematic view of the first embodiment or the second embodiment before the first embodiment or the second embodiment contacts with the anti-falling clamping platform 8. As shown in fig. 8 and fig. 11, when the elevator goes upward, the contact inclined plane 321 of the bearing part 32 of the rotary type falling prevention device is contacted with and pressed by the falling prevention clamping platform 8, the reset part 5 is stressed and then stretched by the action of external force, the bearing part 32 rotates around the fulcrum 31 and is not contacted with the limit support shaft 71 any more, at this moment, the elevator can go upward normally, until the elevator rises to a certain height, the falling prevention clamping platform 8 is not in contact with the contact inclined plane 321 in a pressing way, at this moment, the bearing part 32 rotates towards the direction close to the base 1 under the action of the reset part 5 for resetting. Therefore, when the elevator ascends, the rotary type anti-falling device does not influence the ascending of the elevator, the driving part 2 does not need to work, the working time of the driving part 2 is shortened, the energy is saved, and the service life of the driving part 2 is prolonged.

As shown in fig. 9 and 12, after the traction electromagnet 21 of the rotary anti-falling device is energized, the iron core 212 is stressed to drive the elastic transmission member 4 to pull the lever member 3, the reset member 5 is stressed to be stretched, so the lever member 3 can rotate around the fulcrum 31, at this time, after the lever member 3 rotates a certain angle, no matter the elevator goes upwards or downwards, the bearing part 32 of the lever member 3 cannot be contacted with an external anti-falling clamping platform, at this time, the tail extension bar 22 is close to the signal switch 6, after the lever member 3 rotates to a proper angle, the tail extension bar 22 triggers the signal switch 6, the signal switch 6 generates a signal and feeds the signal back to an external elevator control system, the elevator control system determines to act according to the signal, and the elevator can continue to go downwards. The traction electromagnet 21 provided with the control box 213 has a large attraction force and a small holding current, so that when the traction electromagnet 21 needs to work, the electric energy can be saved.

Fig. 13 is a schematic diagram of the fall arrest function of the first or second embodiment. When an emergency occurs, even under the condition that the driving component 2 fails such as power failure and the like, when the elevator falls down, the lower end of the bearing part 32 contacts the anti-falling clamping platform 8 firstly, the upper end of the bearing part 32 is extruded by the anti-falling clamping platform 8, so that the contact inclined surface 321 is contacted with the limiting supporting shaft 71, and the bearing part 32 is limited by the anti-falling clamping platform 8 and the limiting supporting shaft 4, so that the bearing part 32 cannot rotate, the elevator stops on the anti-falling clamping platform 8 of the next layer, and even under the special conditions such as power failure and the like, the first embodiment or the second embodiment mentioned in the utility model still can play a role of anti-falling.

Claims

1. The utility model provides a rotation anti-falling device, includes the base, fixes the driver part who sets up in base one end, driver part is connected with anti-falling parts, its characterized in that: the anti-falling component comprises a lever component, one end of the lever component is hinged to the base at a position close to the base, the fulcrum of the lever component is a hinged center of the lever component and the base, the other end of the lever component is a bearing part, the bearing part extends towards the direction far away from the driving component and extends out of one end of the base, and a blocking part for limiting the rotation stroke of the lever component is arranged on the base.

2. The rotary type fall preventing device as claimed in claim 1, wherein: the anti-falling component comprises a plurality of groups of lever members which are arranged oppositely, the fulcrums of the lever members are positioned on the same straight line, and a plurality of connecting pieces are arranged between the adjacent lever members.

3. The rotary fall arrest device according to claim 1 or 2, wherein: an elastic transmission part is connected between the lever part and the driving part, and a reset part which can enable the bearing part to rotate towards the direction close to the base is connected between the lever part and the base.

4. The rotary fall arrest device according to claim 3, wherein: the reset piece is an extension spring, the joint of the extension spring and the base is arranged on one side, close to the end part of the base, of the hinged center of the lever piece and the base, and the joint of the extension spring and the lever piece is far away from the base.

5. The rotary fall arrest device according to claim 3, wherein: the lever member is plate-shaped.

6. The rotary fall arrest device according to claim 5, wherein: the normal direction of the lever piece is perpendicular to the normal direction of the base.

7. The rotary fall arrest device according to claim 3, wherein: and a contact inclined plane is arranged on one side of the bearing part close to the base.

8. The rotary type fall preventing device as claimed in claim 1, wherein: the stop part comprises a limiting support shaft, the limiting support shaft is arranged on a rotating path of the bearing part when the bearing part rotates towards the direction close to the base, the limiting support shaft is intermittently abutted to the upper end of the bearing part, and the bearing part is contacted with the limiting support shaft to form a concave surface matched with the limiting support shaft.

9. The rotary type fall preventing device as claimed in claim 1, wherein: the driving component comprises a traction electromagnet fixedly mounted on the base, the traction electromagnet comprises an electromagnet main body and an iron core, a control box is arranged on the electromagnet main body, a return spring is arranged between the iron core and the electromagnet main body, and the driving component is connected through an iron core lever piece.

10. The rotary fall arrest device according to claim 9, wherein: the traction electromagnet further comprises a tail extension rod, one end of the tail extension rod is coaxially connected with the iron core, one end of the tail extension rod extends to the outer side of the electromagnet main body, and a signal switch is arranged on the base corresponding to the tail extension rod.