CN117266531A - Anti-falling device for scaffold - Google Patents

Abstract

The invention provides a falling protection device for a scaffold, which comprises: the driving device, articulated rod and two brake blocks, two brake blocks set up along guide rail extending direction interval, two brake blocks all rotate with the wall seat that attaches to be connected, the axis of rotation of two brake blocks is all perpendicular to guide rail extending direction, two brake blocks are close to the one end of wall seat that attaches to pass through articulated rod hinge connection, driving device sets up on attaching the wall seat and is connected with the guide rail transmission, driving device can selectively drive articulated rod along guide rail extending direction reciprocating motion, when the guide rail attaches the wall seat fast-moving relatively, driving device can drive articulated rod to guide rail moving direction motion, and the brake block that drives one side that is close to the guide rail moving direction rotates to the braking with the guide rail butt. The anti-falling and anti-impact roof has reasonable structural design, can realize anti-falling and anti-impact roof simultaneously, and has good application prospect.

Description

Anti-falling device for scaffold

Technical Field

The invention relates to the technical field of auxiliary equipment of lifting scaffolds, in particular to a falling prevention device for a scaffold.

Background

The lifting scaffold is a high-efficiency scaffold derived from a hanging basket type climbing frame, and comprises a horizontal truss and a plurality of layers of scaffolds arranged on the horizontal truss, wherein the lifting scaffold can be linked with a hanging seat attached to a building wall body to realize up-and-down movement.

The effect of hanging the seat mainly lies in providing the fulcrum for climbing of scaffold frame, simultaneously provides the guarantee for stability and the security of scaffold frame, consequently hanging the seat itself and also having the function of preventing weighing down, among the prior art, hang the anti-weighing device on the seat and generally adopt the card to hinder the structure, thereby the fixture block can't in time rebound when utilizing quick whereabouts thereby realizes hanging the joint between seat and the slide rail and reaches the anti-weighing purpose. However, the conventional blocking structure generally depends on the overspeed driving of the hanging seat and the sliding rail in a single direction, that is, the sliding rail can trigger the anti-falling device when moving fast downward relative to the hanging seat, but the corresponding locking function cannot be achieved when moving fast upward relative to the hanging seat. For some scaffolds adopting the balancing weight as auxiliary driving, if the driving end fails, the balancing weight can cause the scaffold to punch, so that danger is caused.

In view of this, how to provide a fall protection device for a scaffold capable of preventing falling and at the same time, which is one of the technical problems to be solved in the prior art.

Disclosure of Invention

In view of the above, the invention provides a falling prevention device for a scaffold, which aims to provide a falling prevention device with more reasonable structural design and can realize the functions of falling prevention and roof impact prevention at the same time.

The technical scheme of the invention is realized as follows: the invention provides a falling protection device for a scaffold, which comprises: attach wall seat, ejector pin and guider, attach the one side of wall seat and fix in building wall side, attach wall seat upper end rotation and be provided with the ejector pin, attach wall seat keep away from one side of wall body be provided with scaffold frame's guide rail complex guider, still include: the driving device, articulated rod and two brake blocks, two brake blocks set up along guide rail extending direction interval, two brake blocks all rotate with the wall seat that attaches to be connected, the axis of rotation of two brake blocks is all perpendicular to guide rail extending direction, two brake blocks are close to the one end of wall seat that attaches to pass through articulated rod hinge connection, driving device sets up on attaching the wall seat and is connected with the guide rail transmission, driving device can selectively drive articulated rod along guide rail extending direction reciprocating motion, when the guide rail attaches the wall seat fast-moving relatively, driving device can drive articulated rod to guide rail moving direction motion, and the brake block that drives one side that is close to the guide rail moving direction rotates to the braking with the guide rail butt.

In some embodiments, the driving apparatus includes: the device comprises a rotating shaft, rotary dampers, elastic pieces and a shifting block, wherein the rotating shaft is rotationally arranged on an attached wall seat, the rotating shaft is perpendicular to the extending direction of a guide rail, the rotating shaft is in transmission connection with the surface of the guide rail, the rotary dampers are coaxially arranged at two ends of the rotating shaft, the rotating shaft is coaxially connected with rotating parts of the rotary dampers, two ends of the shifting block are fixedly connected with fixing parts of the two rotary dampers respectively, the shifting block is elastically connected with the attached wall seat through the elastic pieces, the shifting block is in transmission connection with a hinge rod, and when the guide rail moves at normal speed, the displacement of the hinge rod is insufficient to drive a brake block to be in butt braking with the guide rail.

In some embodiments, the device further comprises a driving wheel, a driven wheel and a transmission belt, wherein the driving wheel is rotatably arranged on the wall-attached base, the driven wheel is coaxially connected to the rotating shaft in a key manner, the driving wheel and the driven wheel are transmitted through the transmission belt, and the driving wheel is in rolling connection with the surface of the guide rail.

In some embodiments, the wall-mounted type energy-saving device further comprises an adjusting block, the driving wheel is rotatably arranged on the adjusting block, an adjusting groove is formed in the wall-mounted base along the direction perpendicular to the surface of the wall, and the adjusting block is adjustably arranged in the adjusting groove.

In some embodiments, the surface of the shifting block is provided with a sliding block in a protruding manner, the surface of the hinging rod is provided with a guide groove along the length direction perpendicular to the hinging rod, and the sliding block is arranged in the guide groove in a sliding manner.

In some embodiments, the elastic piece comprises two tension springs, the two tension springs are respectively and elastically connected to two side surfaces of the shifting block along the extending direction of the guide rail, one end of the two tension springs, which is far away from the shifting block, is connected with the wall-attached seat surface, the elastic extending direction of the two tension springs is parallel to the extending direction of the guide rail, and when the shifting block is not driven by the rotary damper, and the two tension springs are in a stress balance state, the two brake blocks are not in braking abutting connection with the guide rail.

In some embodiments, a limiting through groove is formed in a surface, close to one end of the guide rail, along the extending direction of the guide rail.

In some embodiments, the guiding device comprises at least two groups of guiding wheels, each group of guiding wheels comprises two guiding wheels respectively arranged on two side surfaces of the wall-attached base along the direction perpendicular to the extending direction of the guiding rail, and the groups of guiding wheels are arranged on the surface of the wall-attached base at intervals along the extending direction of the guiding rail.

In some embodiments, the ejector rod comprises a rotating rod and an extension rod, one end of the rotating rod, which is close to the wall attaching seat, is connected with the wall attaching seat in a rotating hinged manner, one end of the rotating rod, which is far away from the wall attaching seat, is connected with the extension rod in an adjustable manner, the extension rod can reciprocate along the axial direction of the extension rod relative to the rotating rod, and a clamping groove is formed in one end of the extension rod, which is far away from the rotating rod.

In some embodiments, the extension rod is threadably coupled to the rotation rod.

Compared with the prior art, the anti-falling device for the scaffold has the following beneficial effects:

according to the anti-falling device for the scaffold, the two brake blocks are adopted for braking, and the driving device and the hinged rod structure are used for linkage, so that the anti-falling of the lifting scaffold can be realized, the anti-falling top can be realized, and the anti-falling device is safer than the conventional anti-falling device for the scaffold.

The rotary damper is adopted as a driving structure, the damping effect of the rotary damper and the effect related to the rotating speed moment are utilized, the brake block structure can be maintained under the safe speed shifting of the guide rail without braking, and when the rotating speed of the guide rail is too high, the shifting block can be driven to rotate and the brake block can enter a braking section to brake the guide rail.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an isometric view of a fall arrest device for a scaffold of the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a side cross-sectional view of the fall arrest device for a scaffold of the present invention;

FIG. 4 is an exploded view showing the connection structure of the dial block and the shaft portion in the anti-drop device for scaffold of the present invention;

fig. 5 is an isometric view of the fall arrest device for a scaffold of the present invention in one of the fall arrest conditions;

fig. 6 is an isometric view of the fall arrest device for a scaffold of the present invention in one of the fall arrest conditions.

In the figure: 1-wall-attached base, 2-ejector rod, 3-guiding device, 4-driving device, 5-hinging rod, 6-brake block, 7-regulating block, 11-regulating groove, 21-rotating rod, 22-extension rod, 31-guide wheel, 41-rotating shaft, 42-rotary damper, 43-elastic piece, 44-stirring block, 45-driving wheel, 46-driven wheel, 47-driving belt, 431-tension spring, 441-sliding block, 51-guiding groove and 61-limit through groove.

Detailed Description

The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the invention belong. If the definitions set forth in this section are contrary to or otherwise inconsistent with the definitions set forth in the patents, patent applications, published patent applications and other publications incorporated herein by reference, the definitions set forth in this section are preferentially set forth in the definitions set forth herein.

As shown in fig. 1, in combination with fig. 2 to 6, the fall arrest device for a scaffold of the present invention comprises: the wall attaching base 1, the ejector rod 2 and the guiding device 3, the wall attaching base 1 comprises a fixing plate which is vertically arranged, clamping plates which are arranged at two opposite ends of the fixing plate along the horizontal direction, and a supporting plate which is horizontally arranged at one side of the fixing plate far away from the wall, wherein a through groove and/or a through hole are formed in the surface of the fixing plate, the fixing plate can be fixed on a vertical wall through a structure corresponding to the through groove and/or the through hole, the ejector rod 2 is rotatably arranged on the upper surface of the supporting plate, the guiding device 3 is arranged at one opposite side of the clamping plates at two sides, the guiding device 3 is used for being in sliding fit with a lifting guide rail on the scaffold, a driving device 4, a hinging rod 5 and two braking blocks 6 are further arranged between the two clamping plates at intervals along the vertical direction, the two braking blocks 6 are respectively rotated around a fixing shaft, the fixing shaft is horizontally connected between the two clamping plates, one ends of the two braking blocks 6 close to the fixing plate are hinged through the hinging rod 5, the driving device 4 is arranged between the two clamping plates and is in transmission connection with the guide rail, and when the guide rail is relatively attached to the wall attaching base 1, the driving device is in a sliding mode, the driving device can selectively move along the hinging rod 5 and can move along the hinging rod 5 in a reciprocating direction, and can move along the driving direction of the hinging rod 5.

In the above embodiment, two brake blocks 6 are provided, and a linkage structure is formed after the hinge rod 5 is hinged, when the hinge rod 5 moves upwards, the brake block 6 at the upper end rotates and enables one end of the brake block 6 at the upper end far away from the fixed plate to enter the brake area of the guide rail, meanwhile, the brake block 6 at the lower end rotates along with the brake block and is far away from the guide rail, when the hinge rod 5 moves downwards, one end of the brake block 6 at the lower end far away from the fixed plate enters the brake area of the guide rail, meanwhile, the brake block 6 at the upper end rotates along with the brake block and is far away from the guide rail, and when the hinge rod 5 is at the middle position, the brake blocks 6 at the upper end and the lower end cannot be braked. In the above embodiment, the side of the guide rail, which is close to the wall mount 1, is provided with the parallel spaced cross bars along the vertical direction, and the cross bars are used for matching with the ejector rod 2 and the brake block 6, so as to support and brake the lifting scaffold, and the brake block 6 is propped against the surface of the cross bars during braking.

In some embodiments, the driving device 4 includes a rotating shaft 41, a rotary damper 42, an elastic member 43 and a shifting block 44, the rotating shaft 41 is horizontally rotatably disposed between two clamping plates, the axis of the rotating shaft 41 is parallel to the fixed plate, the two ends of the rotating shaft 41 are coaxially provided with the rotary damper 42, the rotary damper 42 is an infinite angle type rotary damper 42, the rotating shaft 41 is coaxially connected with the rotating parts of the rotary damper 42 by a key, the shifting block 44 is fixedly connected with the fixed parts of the two rotary dampers 42, meanwhile, the shifting block 44 is elastically connected with the supporting plate through the elastic member 43, the rotating shaft 41 is in transmission connection with the surface of the guide rail, and the shifting block 44 is in transmission connection with the hinge rod 5. When the normal speed of the guide rail is displaced relative to the wall mount 1, the rotation speed of the rotating shaft 41 is low, the fixed end of the rotary damper 42 is insufficient to generate enough torque to drive the shifting block 44 to drive the elastic piece 43 to deform, at this time, the shifting block 44 is kept stable, and the two brake blocks 6 cannot rotate to achieve the purpose of braking; when the guide rail slides at a speed exceeding a normal speed, the rotating speed of the rotating shaft 41 is higher, the fixed end of the rotary damper 42 generates larger torque, at the moment, the shifting block 44 overcomes the elastic force of the elastic piece 43 and deforms the elastic piece under the driving of the torque of the damper 42, at the moment, the shifting block 44 rotates and drives the hinging rod 5 to displace, and the two braking blocks 6 rotate along with the movement of the hinging rod 5 and achieve the corresponding braking purpose.

Different from the conventional anti-falling device, the two brake blocks 6 adopted by the anti-falling structure can selectively support and block in different directions according to the rapid sliding of the guide rail in different directions, so that anti-falling and anti-collision can be realized.

In some embodiments, the wall mount further comprises a driving wheel 45, a driven wheel 46 and a driving belt 47, wherein the driving wheel 45 is rotatably arranged on the wall mount 1, the driven wheel 46 is coaxially connected to the rotating shaft 41 in a key way, the driving wheel 45 and the driven wheel 46 are driven by a driving belt 47, and the driving wheel 45 is in rolling connection with the surface of the guide rail.

In the above embodiment, as an exemplary structure of a feasible transmission connection between the guide rail and the rotating shaft 41, the driving wheel 45 and the driven wheel 46 are adopted for transmission, specifically, the rotation axis of the driving wheel 45 is parallel to the rotating shaft 41, the driving wheel 45 is arranged on the surface of the guide rail in a rolling manner, in the rolling process of the driving wheel 45, the driven wheel 46 is driven to rotate by the driving belt 47, and the driven wheel 46 is driven to rotate by the rotation of the driven wheel 46, in the above exemplary embodiment, the rotation direction of the driving wheel 45 is the same as the rotation direction of the driven wheel 46, therefore, when the guide rail drops down rapidly, after the driving wheel 45, the driving belt 47 and the driven wheel 46 are driven, as shown in fig. 6, the lower brake block 6 stretches out and brakes the guide rail, otherwise, the upper brake block stretches out and brakes the guide rail.

In some embodiments, the driving belt 47 may be a chain structure, and gears may be used for the driving wheel 45 and the driven wheel 46.

In some embodiments, gears may be used as a transmission structure to drive the guide rail and the rotating shaft 41, and according to different transmission systems, the rotation direction of the corresponding shifting block 44 may be opposite to the rotation direction of the driving wheel.

In some embodiments, the device further comprises an adjusting block 7, the driving wheel 45 is rotatably arranged on the adjusting block 7, an adjusting groove 11 is formed in the surface of the clamping plate on the wall base 1 along the direction perpendicular to the plane where the fixing plate is located, and the adjusting block 7 is adjustably arranged in the adjusting groove 11.

In the above embodiment, the adjustment block 7 is provided for adjusting the rolling contact between the driving wheel 45 and the guide rail to maintain the tight contact between the driving wheel 45 and the guide rail. Specifically, the adjusting groove 11 is used for limiting and guiding the adjusting block 7, and the adjusting block 7 can be finally fastened and connected with the wall-attached base 1 through bolts.

In some embodiments, the surface of the shifting block 44 is convexly provided with a sliding block 441, the surface of the hinge rod 5 is provided with a guide groove 51 along the direction perpendicular to the length direction of the hinge rod 5, and the sliding block 441 is slidably arranged in the guide groove 51.

The specific working structure of the above embodiment may refer to fig. 3, 5 and 6, in which the longitudinal direction of the guide groove 51 may be approximately perpendicular to the longitudinal direction of the hinge rod 5, and in order to avoid that the receiving direction of the sliding block 441 is perpendicular to the inner wall of the guide groove 51 under the action of the rotation moment of the shifting block 44, the guide groove 41 may be set so as not to be perpendicular to the direction of the rotating force arm of the sliding block 441.

In some embodiments, the elastic member 43 includes two tension springs 431, the two tension springs 431 are respectively elastically connected to two side surfaces of the dial block 44 along the vertical direction, one end of the two tension springs 431 away from the dial block 44 is connected to the surface of the wall mount 1, the elastic extension direction of the two tension springs 431 is parallel to the extension direction of the guide rail, and when the dial block 44 is not driven by the rotary damper 42, and the two tension springs 431 are in a force balance state, the two brake blocks 6 are not in braking abutment with the guide rail.

In the above embodiment, the shifting block 44 includes a rotating portion and a force arm portion protruding from the rotating portion, the rotating portion is coaxially disposed with the rotating shaft 41, the force arm portion is used for driving with the hinge rod 5, so as to avoid the force arm from swinging down under the dead weight, and therefore, two tension springs 431 are provided for maintaining the force arm to be horizontal or nearly horizontal in a stable state, and at this time, in a linkage state of the force arm and the hinge rod 5, as shown in fig. 3, both brake blocks 6 are in a state incapable of braking contact with the guide rail. In order to provide a connection site for the lower tension spring 431, a second support plate is provided below the lower brake shoe 6 for connecting the lower tension spring 431.

It should be understood that the two tension springs 431 are deformed by the rotation of the dial 44, and the moment required for the deformation is provided by the rotary damper 42, so the rotary damper 42 should be selected so as to: when the corresponding brake block 6 can reach the braking position, the resultant force of the moment of the dead weights of the two tension springs 431 and the moment arm part is the same as the moment of the fixed end of the rotary damper 42 at the limit of the safe speed.

In some embodiments, the surface of the brake block 6 near one end of the rail along the extending direction of the rail is provided with a limit through groove 61.

In the above embodiment, when the brake block 6 is driven to be able to abut against the guide rail and brake, if the brake block 6 cannot be locked with the guide rail, the shifting block 44 may be continuously restored to the balanced state under the driving of the elastic member 43, at this time, the brake block 6 is separated from the guide rail, and the guide rail may be overspeed again, so the through groove 61 is provided for matching with the rail on the guide rail, so as to achieve the locking purpose and avoid resetting of the brake block 6.

In some embodiments, the guiding device 3 includes at least two sets of guiding wheels 31, each set of guiding wheels 31 includes two guiding wheels 31 respectively disposed on two side surfaces of the wall-attached base 1 along a direction perpendicular to the extending direction of the guiding rail, and the sets of guiding wheels 31 are disposed on the surface of the wall-attached base 1 at intervals along the extending direction of the guiding rail.

In the above embodiment, at least two guide wheels 31 are arranged on opposite sides of the two clamping plates and near one end of the fixing plate in an array along the vertical direction, and the guide wheels 31 and the guide rails are used for limiting and the guide rails can slide relative to the wall mount 1.

In some embodiments, the ejector rod 2 includes a rotating rod 21 and an extension rod 22, one end of the rotating rod 21, which is close to the wall attaching base 1, is rotatably hinged with the wall attaching base 1, one end of the rotating rod 21, which is far away from the wall attaching base 1, is adjustably connected with the extension rod 22, the extension rod 22 can reciprocate along the axial direction of the extension rod 22 relative to the rotating rod 21, and a clamping groove is formed in one end of the extension rod 22, which is far away from the rotating rod 21.

In the above embodiment, the ejector rod 2 is used for supporting the lifting scaffold, the rotating rod 21 is provided, so that the ejector rod 2 can swing integrally, thereby supporting the scaffold or allowing the scaffold to move up and down, the extension rod 22 is provided, the overall length of the ejector rod 2 can be adjusted, the ejector rods 2 with different lengths can be selected according to different supporting scenes, and the clamping groove structure is generally matched with the supporting and positioning structure represented by the lifting scaffold.

In some embodiments, the extension rod 22 is threadably coupled to the rotation rod 21.

In the above embodiment, by rotating the extension rod 22, the extension length of the extension rod 22 can be changed, thereby changing the length of the overall jack 2.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. A fall arrest device for a scaffold, comprising: attach wall seat, ejector pin and guider, attach the one side of wall seat and fix in building wall side, attach wall seat upper end rotation and be provided with the ejector pin, attach wall seat keep away from one side of wall body be provided with scaffold frame's guide rail complex guider, its characterized in that still includes: the driving device, articulated rod and two brake blocks, two brake blocks set up along guide rail extending direction interval, two brake blocks all rotate with the wall seat that attaches to be connected, the axis of rotation of two brake blocks is all perpendicular to guide rail extending direction, two brake blocks are close to the one end of wall seat that attaches to pass through articulated rod hinge connection, driving device sets up on attaching the wall seat and is connected with the guide rail transmission, driving device can selectively drive articulated rod along guide rail extending direction reciprocating motion, when the guide rail attaches the wall seat fast-moving relatively, driving device can drive articulated rod to guide rail moving direction motion, and the brake block that drives one side that is close to the guide rail moving direction rotates to the braking with the guide rail butt.

2. The fall arrest device for a scaffold as claimed in claim 1, wherein the driving means comprises: the device comprises a rotating shaft, rotary dampers, elastic pieces and a shifting block, wherein the rotating shaft is rotationally arranged on an attached wall seat, the rotating shaft is perpendicular to the extending direction of a guide rail, the rotating shaft is in transmission connection with the surface of the guide rail, the rotary dampers are coaxially arranged at two ends of the rotating shaft, the rotating shaft is coaxially connected with rotating parts of the rotary dampers, two ends of the shifting block are fixedly connected with fixing parts of the two rotary dampers respectively, the shifting block is elastically connected with the attached wall seat through the elastic pieces, the shifting block is in transmission connection with a hinge rod, and when the guide rail moves at normal speed, the displacement of the hinge rod is insufficient to drive a brake block to be in butt braking with the guide rail.

3. The anti-falling device for the scaffold according to claim 2, further comprising a driving wheel, a driven wheel and a transmission belt, wherein the driving wheel is rotatably arranged on the wall attaching base, the driven wheel is coaxially connected on the rotating shaft in a key way, the driving wheel and the driven wheel are transmitted through the transmission belt, and the driving wheel is in rolling connection with the surface of the guide rail.

4. The falling protection device for the scaffold according to claim 3, further comprising an adjusting block, wherein the driving wheel is rotatably arranged on the adjusting block, an adjusting groove is formed in the wall attaching base along the direction perpendicular to the surface of the wall, and the adjusting block is adjustably arranged in the adjusting groove.

5. The drop-preventing device for scaffold as claimed in claim 2, wherein the dial block surface is provided with a slider protruding therefrom, the hinge rod surface is provided with a guide groove along a direction perpendicular to a length direction of the hinge rod, and the slider is slidably disposed in the guide groove.

6. The anti-falling device for the scaffold according to claim 2, wherein the elastic member comprises two tension springs, the two tension springs are respectively and elastically connected to two side surfaces of the shifting block along the extending direction of the guide rail, one ends of the two tension springs, which are far away from the shifting block, are connected with the wall-attached seat surface, the elastic extending directions of the two tension springs are parallel to the extending direction of the guide rail, and when the shifting block is not driven by the rotary damper and the two tension springs are in a stress balance state, the two brake blocks are not in braking abutting connection with the guide rail.

7. The fall protection device for scaffold according to claim 1, wherein the surface of the brake block, which is close to one end of the guide rail, along the extending direction of the guide rail is provided with a limit through groove.

8. The drop protection device for scaffolds as claimed in claim 1, wherein the guide means comprises at least two sets of guide wheels, each set of guide wheels comprises two guide wheels respectively arranged on two side surfaces of the wall attaching base along the direction perpendicular to the extending direction of the guide rail, and the sets of guide wheels are arranged on the surface of the wall attaching base at intervals along the extending direction of the guide rail.

9. The drop preventing device for scaffold according to claim 1, wherein the ejector rod comprises a rotating rod and an extension rod, one end of the rotating rod, which is close to the wall attaching seat, is rotatably hinged with the wall attaching seat, one end of the rotating rod, which is far away from the wall attaching seat, is adjustably connected with the extension rod, the extension rod can reciprocate along the axial direction relative to the rotating rod, and a clamping groove is formed in one end of the extension rod, which is far away from the rotating rod.

10. The fall arrest device for a scaffold of claim 9, wherein said extension rod is threadedly coupled to the rotation rod.