Lifting and falling prevention device

Abstract

The present application relates to the technical field of lifting device, and particularly relates to a lifting and anti-falling device, which comprises a lifting module and a limiting module, the lifting module comprises a lifting body and a lower protruding part, the lower protruding part is protruded on the lifting body, and the lifting body is provided with a plurality of tooth grooves arranged in up and down direction on one side of the lower protruding part; the limiting module comprises a shifting part and a stop part, the shifting part is rotatably arranged on the side of the tooth groove away from the lifting body, and the stop part is arranged on the outside of the shifting part; in the lifting process of the lifting body, the shifting part is used for movably inserted into the tooth groove to prevent the lifting body from moving downward; the shifting part is provided with a first contact part, the stop part is provided with a first stop part, when the lifting body is lifted to a specified height, the lower protruding part can shift the shifting part upward, so that the first contact part is aligned with the first stop part and is inserted by the first stop part, thereby locking the shifting part, in the locking state, the shifting part is separated from the tooth groove, and the lifting body can move downward.

Description

Technical Field

[0001] This invention relates to the technical field of lifting devices, and specifically to a lifting anti-fall device. Background Technology

[0002] Lifting components, especially automatic lifting doors, are usually equipped with anti-fall devices to prevent the door panel from suddenly falling during the rising process and causing accidents. Existing anti-fall mechanisms mainly adopt a combination of a stop pawl and a rack. A vertical rack is set on the door panel, and a stop pawl with a return torsion spring is set on one side of the door panel. The pawl anti-return principle is used to ensure that the door panel can only rise and cannot fall. However, in actual applications, after the door panel rises to a designated height, it needs to be lowered back to maintain the normal operation of the door panel. For this reason, the stop pawl needs to be temporarily disengaged from the rack to release the anti-return operation on the door panel.

[0003] The mechanism for disengaging the stop pawl from the rack is often complex. For example, a height sensor can be installed on the door panel, along with a sliding mechanism for the stop pawl. When the sensor detects that the door panel has reached a designated height, it sends a signal to the sliding mechanism, which then moves the stop pawl away from the rack. Once the stop pawl is no longer restraining the door, it can fall freely downwards. However, such anti-fall mechanisms are complex, requiring high manufacturing precision and precise power transmission, which increases the manufacturing cost of the lifting door and hinders lean production. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a lifting and falling prevention device, which effectively achieves the falling prevention operation of the lifting component using a simple structure.

[0005] The lifting and anti-fall device according to the present invention includes a lifting module and a limiting module. The lifting module includes a lifting body and a lower protrusion. The lifting body can move up and down under the drive of an external force. The lower protrusion is provided on the lifting body and a plurality of vertically arranged toothed grooves are provided above the lower protrusion. The limiting module includes a toggle member and a stop member. The toggle member is rotatably disposed on the side of the toothed groove away from the lifting body, and the stop member is disposed on the side of the toggle member. During the rising process of the lifting body, the toggle member is used to movably insert into the toothed groove to prevent the lifting body from moving down. The toggle member is provided with a first contact portion, and the stop member is provided with a first stop portion. When the lifting body rises to a specified height, the lower protrusion can push the toggle member upward so that the first contact portion aligns with the first stop portion and is inserted by the first stop portion, thereby locking the toggle member. In this locked state, the toggle member is disengaged from the toothed groove, and the lifting body can move down.

[0006] The method according to embodiments of the present invention has at least the following beneficial effects: This embodiment of the application features a lower protrusion on the lifting body. When the lifting body rises to a designated height (e.g., the set maximum rising position), the lower protrusion pushes the actuating component upwards, disengaging it from the toothed groove. This provides clearance for the subsequent downward movement of the lifting body, thus meeting the requirement for the lifting body to be both raised and lowered. Furthermore, this application includes a first contact portion and a first stop portion to form a locking mechanism for the actuating component. The actuating component is locked at a designated rotation angle through the insertion between the first contact portion and the first stop portion, ensuring that the actuating component can permanently disengage from the toothed groove without self-resetting, thus guaranteeing unimpeded downward movement of the lifting body. This embodiment utilizes a purely mechanical structure to lock the actuating component, resulting in a simple, easy-to-implement, reliable, and durable structure that significantly reduces the overall manufacturing cost of the device.

[0007] According to some embodiments of the present invention, the actuating element includes an actuating body and claws. The actuating body is rotatably disposed on one side of the lifting body, and the claws are disposed on the circumferential surface of the actuating body. During the lifting process of the lifting body, the claws are used to movably engage with the tooth groove to prevent the lifting body from moving downward. A first contact portion is disposed on the actuating body, and a first stop portion is disposed on the outer side of the actuating body.

[0008] According to some embodiments of the present invention, the first contact portion is a groove provided on the dial surface of the actuating body, and the end of the first stop portion is spring-back and abuts against the actuating body.

[0009] According to some embodiments of the present invention, the first stop is a ball-head plunger, which is perpendicular to the disk surface of the actuating body, and the end of the ball-head plunger is provided with a spring-loaded positioning bead. Depending on the rotation angle of the actuating member, the positioning bead abuts against or is inserted into the groove of the disk surface of the actuating body.

[0010] According to some embodiments of the present invention, the lifting module further includes an upper protrusion, and the lifting body is provided with an upper protrusion above the tooth groove. The upper protrusion and the lower protrusion protrude from the lifting body at least along the same side. The actuating member is also provided with a second contact portion, and the stopping member is also provided with a second stopping portion. When the lifting body descends to a designated position, the upper protrusion can move the actuating member downward to a designated angle so that the second contact portion aligns with the second braking portion and abuts against the second stopping portion, thereby restricting the actuating member from continuing to rotate. The actuating member thereby restricts the descent of the lifting body. And at this angle position, the actuating member re-engages with the tooth groove.

[0011] According to some embodiments of the present invention, the second contact portion is the top surface of the actuating body. When the actuating member is pushed down to a specified angle by the upper protrusion, the top surface of the actuating body can fit against the second stop portion.

[0012] According to some embodiments of the present invention, the tooth groove adopts a sawtooth structure, the tooth groove is provided with an upper groove surface and a lower groove surface, the upper groove surface and the lower groove surface intersect at a certain angle to form the bottom of the groove, the upper groove surface is set horizontally, and the lower groove surface slopes downward from the bottom of the groove to the opening of the groove.

[0013] According to some embodiments of the present invention, the bottom surface of the upper protrusion is parallel to the upper groove surface of the tooth groove, and the top surface of the lower protrusion is parallel to the lower groove surface of the tooth groove.

[0014] According to some embodiments of the present invention, the limiting module further includes a mounting base, on which a mounting shaft is inserted, and a toggle member is rotatably sleeved on the mounting shaft. A return spring is provided on the mounting base, with one end of the return spring connected to the mounting base and the other end connected to the toggle member.

[0015] According to some embodiments of the present invention, the lifting and anti-fall device further includes a power module and a sensor. The power module drives the lifting body to move the lifting body. The end of the actuating member is provided with a trigger part. When the actuating member is actuated by the lower protrusion, the trigger part can rotate with the actuating member and reach the detection range of the sensor, thereby triggering the power module.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of a lifting and falling protection device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of a lifting and falling protection device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the lower protrusion of an embodiment of the present invention pushing the actuating member upward; Figure 4 This is a schematic diagram of the upper protrusion pushing the actuating member downward according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the actuating member structure when the first contact portion and the first stop portion are inserted according to an embodiment of the present invention; Figure 6 Regarding an embodiment of the present invention Figure 5 The main view; Figure 7 Regarding an embodiment of the present invention Figure 6 AA section view; Figure 8 This is a schematic diagram of the structure of a ball-head plunger according to an embodiment of the present invention; Figure 9This is a schematic diagram of the actuating member structure when the second contact portion abuts against the second stop portion according to an embodiment of the present invention.

[0018] Figure label: Lifting module 100; lifting body 110; lower protrusion 120; toothed groove 130; upper groove surface 131; lower groove surface 132; upper protrusion 140; limiting module 200; actuating element 210; actuating body 211; claw 212; groove 213; second contact part 214; trigger part 215; ball plunger 221; threaded cylinder 221a; spring 221b; positioning ball 221c; second stop part 222; mounting base 230; mounting shaft 231; threaded through hole 232; drive module 300; sensor 310. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0023] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in one or more embodiments or examples.

[0024] Please see Figure 1 This application provides a lifting and falling prevention device, including a lifting module 100, a limiting module 200 and a driving module 300. The driving module 300 drives and connects to the lifting module 100 to drive the lifting module 100 to rise or fall. The limiting module 200 is provided on one side of the lifting module 100 to limit the extreme value of the lifting module 100 to rise or even fall.

[0025] Please see Figure 2 The lifting module 100 includes a lifting body 110 and a lower protrusion 120. The lifting body 110 is vertically arranged, and the lower protrusion 120 is located at the lower part of the lifting body 110 and protrudes outward from at least one side of the lifting body 110. The lifting body 110 has a plurality of toothed grooves 130 arranged sequentially from top to bottom on this side. When this device is applied to a lifting door, the lifting body 110 can be understood as a door panel or a toothed bar on the door panel surface. The limiting module 200 includes an actuating member 210 and a stop member. The actuating member 210 is rotatably disposed on the side of the toothed groove 130 opposite to the lifting body 110, and the stop member is disposed on the outside of the actuating member 210. During the rising process of the lifting body 110, the actuating member 210 is used to movably engage with the toothed groove 130 to prevent the lifting body 110 from moving downward during the rising process, thereby playing a role in preventing a fall. The anti-return principle of the actuating member 210 for the lifting body 110 can refer to the existing ratchet anti-return mechanism. The actuating member 210 has a first contact portion, and the stop member has a first stop portion. When the lifting body 110 rises to the set highest position, the lower protrusion 120 can push the actuating member 210 upward so that the first contact portion aligns with the first stop portion and is engaged by the first stop portion, thereby locking the actuating member 210. In this locked state, the actuating member 210 disengages from the toothed groove 130, and the lifting body 110 can move downward.

[0026] Please see Figure 3The actuating element 210 adopts a pawl structure. The actuating element 210 includes an actuating body 211 and a claw 212. The actuating body 211 is rotatably disposed on one side of the lifting body 110. The rotation center line of the turntable is set horizontally. Each tooth groove 130 extends in a direction parallel to the rotation center line of the turntable. The claw 212 is disposed on the circumferential surface of the actuating body 211. The shape and size of the end of the claw 212 correspond to the tooth groove 130. During the upward movement of the lifting body 110, the claw 212 is used to movably insert into the tooth groove 130 to prevent the lifting body 110 from moving downward midway. The first contact part is disposed on the actuating body 211, and the first stop part is disposed on the outside of the actuating body 211. Both the first contact part and the first stop part are disposed in the area outside the rotation center line of the actuating body 211.

[0027] Regarding the rotatable setting of the actuating body 211, the limiting module 200 also includes a mounting base 230. The mounting base 230 has a pre-set hole and a mounting shaft 231 is inserted into the hole. The actuating body 211 is rotatably sleeved on the mounting shaft 231. The mounting base 230 is provided with a return spring 221b. One end of the return spring 221b is connected to the mounting base 230 and the other end is connected to the actuating member 210. The function of the return spring 221b is to provide the actuating body 211 with an elastic force that can return to the initial angle, thereby causing the end of the claw 212 to adhere to the tooth groove 130 during the lifting body 110's upward movement to maintain the insertion action, and thus providing a durable and reliable anti-return function for the lifting body 110.

[0028] The end of the first stop is spring-backed so that the first stop can slide off the first contact part under a sufficiently large external force, so as not to lock the toggle member 210 and prevent it from being reconnected to the lifting body 110.

[0029] Please see Figures 6 to 8 In some embodiments, the first contact portion is a groove 213 provided on the surface of the actuating body 211 (see...). Figure 7 The first stop part adopts the form of a ball-head plunger 221, which includes a threaded cylinder 221a, a spring 221b, and a positioning ball 221c (see...). Figure 7The outer circumferential surface of the threaded cylinder 221a is provided with an external thread. A positioning bead 221c is provided at the opening of the threaded cylinder 221a. A spring 221b is installed between the positioning bead 221c and the inner bottom wall of the threaded cylinder 221a. According to this structure, the positioning bead 221c can rebound along the length of the threaded cylinder 221a and can rotate around its own center line. In order to ensure that the positioning bead 221c can smoothly slide into the groove 213 and be inserted into the groove 213 when aligned with it, it is recommended that the groove 213 adopt an arc-shaped recessed structure with a smooth transition edge, and the shape and size of the positioning bead 221c correspond to the shape and size of the groove 213.

[0030] In most applications, the positioning bead 221c abuts against the disc surface of the actuating body 211, and the spring 221b is compressed. By pre-designing the maximum height that the lifting body 110 and the lower protrusion 120 can rise, as well as the height of the actuating element 210, when the lifting body 110 rises to the set highest position, the lower protrusion 120 is slightly higher than the actuating element 210, thereby enabling the claw 212 to be pushed upwards to rotate the actuating body 211. When the actuating body 211 rotates to a certain angle, the groove 213 will... Aligned with the ball plunger 221, since the groove 213 is recessed on the disk surface of the actuating body 211, the positioning bead 221c in the aligned state can be inserted into the groove 213 under the elastic force of the spring 221b, thereby restricting the continued rotation of the actuating body 211. The actuating member 210 is thus locked at the rotation angle. At this rotation angle position, the rotation amplitude of the turntable is large enough so that the claw 212 has disengaged from the tooth groove 130. Therefore, the lifting body 110 can move freely downward without being blocked by the actuating member 210.

[0031] Please see Figure 7 To simplify the structure and assembly process, the two side plates of the mounting base 230 are respectively provided with threaded through holes 232. The ball plunger 221 is installed by screwing it into the corresponding threaded through hole 232. The positioning bead 221c is located inside the mounting base 230 and abuts against the disc surface or groove 213 of the actuating body 211. The abutting force between the positioning bead 221c and the actuating body 211 can be adjusted by controlling the screwing depth of the ball plunger 221.

[0032] To further enhance the locking strength of the actuating element 210, it is recommended that two ball plungers 221 be provided. The two ball plungers 221 are respectively located on the outer sides of the two discs of the actuating body 211 and abut against the two discs respectively. Correspondingly, the two discs of the actuating body 211 are respectively provided with grooves 213. When the actuating element 210 is actuated to a specified angle by the lower protrusion 120, the ball plungers 221 located on both sides of the actuating body 211 are aligned with the corresponding grooves 213 and inserted into the corresponding grooves 213, thereby locking the actuating element 210 more effectively.

[0033] Based on the movable insertion between the actuating member 210 and the toothed groove 130, the actuating member 210 can act as a stop during the upward movement of the lifting body 110, thereby preventing the lifting body 110 from falling during the upward movement. Based on the rotatable setting of the actuating member 210, this device can disengage the actuating member 210 from the toothed groove 130 when the lifting body 110 rises to a specified height (such as the preset highest rising position), so that the lifting body 110 is no longer restricted by the actuating member 210 and can move downward, thereby restoring the closed state and meeting the basic working requirement that the lifting body 110 can be raised and lowered. Furthermore, after disengaging the actuating member 210 from the toothed groove 130, the actuating member 210 is locked at a specified rotation angle through a purely mechanical structure using the movable connection of the first contact part and the first stop part, so that the actuating member 210 will not re-insert into the toothed groove 130 due to its own rebound energy after leaving the toothed groove 130, thereby hindering the downward movement and reset of the lifting body 110. The first contact part and the first stop part mainly utilize the principle of groove 213 and elastic element insertion. The structure is simple, easy to implement, reliable and durable. The simple structure can lock the toggle element 210, which can significantly reduce the processing cost of the lifting and anti-fall device and simplify the internal structure.

[0034] According to the above structure, when the lifting body 110 needs to move down to reset, the toggle 210 is pushed upward by the lower protrusion 120 and locked by itself, thereby providing a clearance for the lifting body 110. It can be understood that before the lifting body 110 needs to rise again to open the door, the toggle 210 needs to return to the insertion state with the tooth groove 130, thereby playing an effective anti-fall role.

[0035] Please see Figure 4To reset the actuating member 210, the lifting module 100 further includes an upper protrusion 140, which is disposed on the lifting body 110. The upper protrusion 140 and the lower protrusion 120 protrude from the lifting body 110 at least on the same side. The actuating member 210 also has a second contact portion 214, and the stop member also has a second stop portion 222. When the lifting body 110 descends to the set lowest position, the upper protrusion 140 can move the actuating member 210 downward to a specified angle, thereby completing the reset of the actuating member 210. At this angle position, the actuating member 210 re-engages with the toothed groove 130.

[0036] By designing the positions of the second contact portion 214 and the second stop portion 222, when the actuating member 210 is pushed down to a specified angle by the upper protrusion 140, the second contact portion 214 can abut against the second stop portion 222, thereby restricting the actuating member 210 from continuing to rotate. The actuating member 210, which no longer continues to rotate, blocks the upper protrusion 140, thereby restricting the lifting body 110 from continuing to descend.

[0037] Specifically, please refer to Figure 4 as well as Figure 9 The second contact portion 214 is the top surface of the actuating body 211, which is flat. The second stop portion 222 is the top plate of the mounting base 230. Both the top surface of the actuating body 211 and the inner top wall of the mounting base 230 are flat structures. When the actuating member 210 is pushed down to a specified angle by the upper protrusion 140, the top surface of the actuating body 211 can fit against the surface of the top plate of the mounting base 230.

[0038] Please refer to [link / reference] for further information. Figure 3 The toothed groove 130 adopts a sawtooth structure, and the toothed groove 130 has an upper groove surface 131 and a lower groove surface 132. The upper groove surface 131 and the lower groove surface 132 intersect at a certain angle to form the bottom of the groove. The upper groove surface 131 is set horizontally, and the lower groove surface 132 slopes downward from the bottom of the groove to the opening of the groove. The end of the actuating member 210 is set correspondingly to the toothed groove 130. The bottom surface of the upper protrusion 140 is parallel to the upper groove surface 131 of the toothed groove 130, and the top surface of the lower protrusion 120 is parallel to the lower groove surface 132 of the toothed groove 130. This surface orientation is conducive to the smooth actuation of the actuating member 210 by the upper protrusion 140 and the lower protrusion 120, so as not to cause failure to actuate or obvious scraping due to the large difference in the orientation of the two contact surfaces.

[0039] In some embodiments, the drive module 300 includes a power module (not shown), a sensor 310, and a control unit. The power module and the sensor 310 are electrically connected. The power module drives the lifting body 110 to move the lifting body 110 downward. Please refer to [link to relevant documentation]. Figure 3 and Figure 6The actuating body 211 has a trigger part 215 protruding on the side opposite to the claw 212. The sensor 310 is located outside the trigger part 215. When the actuating member 210 is actuated by the lower protrusion 120 reaching the set highest position, the trigger part 215 can rotate with the actuating member 210 and contact the sensor 310. After the sensor 310 is contacted, it transmits a detection signal to the control unit. The control unit powers on the power module, and the power module starts the power to move the lifting body 110 downward. The purpose of configuring the sensor 310 on the power module in this embodiment is to provide an additional layer of safety confirmation for the downward movement of the lifting body 110. The power module is only powered on and the lifting body 110 is only moved downward when the lower protrusion 120 reaches the set highest position and the actuating member 210 is actuated to the specified angle. This prevents the lifting body 110 from moving downward before reaching the set highest position and further prevents the lifting body 110 from falling midway.

[0040] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A lifting and falling prevention device, characterized in that, include: The lifting module includes a lifting body and a lower protrusion; the lifting body can move up and down under the drive of external force, and the lower protrusion is provided on the lifting body, and several vertically arranged toothed grooves are provided above the lower protrusion. The limiting module includes an actuating member and a stopping member. The actuating member is rotatably disposed on the side of the toothed groove opposite to the lifting body, and the stopping member is disposed on one side of the actuating member. During the upward movement of the lifting body, the actuating member is movably inserted into the toothed groove to prevent the lifting body from moving downward. The actuating member has a first contact portion, and the stopping member has a first stopping portion. When the lifting body rises to a specified height, the lower protrusion can push the actuating member upward so that the first contact portion aligns with the first stopping portion and is inserted by the first stopping portion, thereby locking the actuating member. In this locked state, the actuating member disengages from the toothed groove, and the lifting body can move downward. The actuating member includes an actuating body, the first contact portion is a groove provided on the disc surface of the actuating body, and the end of the first stopping portion is spring-loaded and abuts against the actuating body.

2. The fall arrest device of claim 1, wherein, The actuating element also includes claws. The actuating body is rotatably disposed on one side of the lifting body. The claws are disposed on the circumferential surface of the actuating body. During the upward movement of the lifting body, the claws are used to movably engage with the tooth groove to prevent the lifting body from moving downward. The first contact portion is disposed on the actuating body, and the first stop portion is disposed on the outer side of the actuating body.

3. The fall arrest device of claim 2, wherein, The first stop is a ball plunger, which is perpendicular to the disk surface of the actuating body. The end of the ball plunger is provided with a spring-loaded positioning bead. Depending on the rotation angle of the actuating element, the positioning bead abuts against or is inserted into the groove of the disk surface of the actuating body.

4. The lifting and falling prevention device according to claim 2, characterized in that, The lifting module further includes an upper protrusion, and the lifting body is provided with the upper protrusion above the tooth groove. The upper protrusion and the lower protrusion protrude from the lifting body at least along the same side. The actuating member is also provided with a second contact portion, and the stopping member is also provided with a second stopping portion. When the lifting body descends to a designated position, the upper protrusion can move the actuating member downward to a designated angle so that the second contact portion aligns with and abuts against the second stopping portion, thereby restricting the actuating member from continuing to rotate. The actuating member thereby restricts the descent of the lifting body. And at this angle position, the actuating member re-engages with the tooth groove.

5. The fall arrest device of claim 4, wherein, The second contact portion is the top surface of the actuating body. When the actuating member is pushed down to the specified angle by the upper protrusion, the top surface of the actuating body can fit against the second stop portion.

6. The fall arrest device of claim 4, wherein, The toothed groove has a sawtooth structure. The toothed groove has an upper groove surface and a lower groove surface. The upper groove surface and the lower groove surface intersect at a certain angle to form the bottom of the groove. The upper groove surface is set horizontally, and the lower groove surface slopes downward from the bottom of the groove to the opening of the groove.

7. The fall arrest device of claim 4, wherein, The bottom surface of the upper protrusion is parallel to the upper groove surface of the tooth groove, and the top surface of the lower protrusion is parallel to the lower groove surface of the tooth groove.

8. The lifting and falling prevention device according to claim 1, characterized in that, The limiting module also includes a mounting base, on which a mounting shaft is inserted. The actuating element is rotatably sleeved on the mounting shaft. The mounting base is provided with a return spring, one end of which is connected to the mounting base and the other end of which is connected to the actuating element.

9. The fall arrest device of claim 1, wherein, It also includes a power module and a sensor. The power module drives the lifting body to move the lifting body. The end of the actuating member is provided with a trigger part. When the actuating member is actuated by the lower protrusion, the trigger part can rotate with the actuating member and reach the detection range of the sensor. The sensor thereby triggers the power module.

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