CN209886940U - Operation platform lifting falling-proof device applied to membrane type wall surfacing special machine - Google Patents

Abstract

The utility model discloses an operation platform lifting anti-falling device applied to a special membrane wall surfacing machine, which is arranged on a stand column (10), and comprises an anti-falling device body matched on a square guide rail (14) of the stand column (10), wherein a locking device is arranged at the matching part of the anti-falling device body and the square guide rail (14); can be when emergency braking when the accident appears, with whole anti-falling device body locking on the square guide rail of stand under the effect of strong friction power to realize preventing the purpose of falling.

Description

Operation platform lifting falling-proof device applied to membrane type wall surfacing special machine

Technical Field

The utility model relates to a fields such as operation platform anti-falling technique that diaphragm type wall build-up welding special plane, specific theory is applied to operation platform lift anti-falling device of diaphragm type wall build-up welding special plane.

Background

The existing special membrane wall surfacing machine is generally provided with an operating platform, the operating platform is generally matched on a square guide rail of a stand column through a sliding assembly, and is free of anti-falling equipment.

The existing membrane wall surfacing special operation platform is provided with an operation box and a cable, the cable is connected with a welding machine head, when a driving lifting chain (lifting chain) is broken, the cable falls down under the action of gravity to generate large tension on the cable, all the cables connected with the welding machine head are broken, and the problems of equipment circuit damage and the like exist.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an operation platform lift anti-falling device who is applied to diaphragm type wall build-up welding special plane can be when emergency braking when the accident appears, with the locking of whole anti-falling device body on the square guide rail of stand under the effect of strong friction power to realize preventing the purpose of falling.

The utility model discloses a following technical scheme realizes: be applied to operation platform lift anti-falling device of diaphragm type wall build-up welding special plane, set up on the stand, including the anti-falling device body of cooperation on the square guide rail of stand, be provided with locking device in anti-falling device body and square guide rail cooperation department.

Further for better realizing the utility model discloses, can realize can not carrying out emergency braking and with the locking of anti-falling device body on square guide rail when normal operating, and when the unexpected condition appears, can reach emergency braking to make the anti-falling device body lock under the effect of frictional force on square guide rail, adopt the following structure that sets up very much: the locking device comprises a cam mechanism, a zipper mechanism and a braking mechanism, the braking mechanism is matched with the zipper mechanism, the zipper mechanism is connected with the cam mechanism, and the cam mechanism is arranged on the anti-falling device body and can form strong friction with the square guide rail under the braking condition.

Further, the utility model can provide an emergency braking force for the zipper mechanism and the cam mechanism when an accident occurs; when no accident occurs, the zipper mechanism and the cam mechanism can be in a loose state between the zipper mechanism and the square guide rail, the normal up-and-down operation of the anti-falling device body can not be influenced, and the following arrangement structure is particularly adopted: the brake mechanism comprises an ejector rod and a crankshaft rod, the ejector rod is connected with and matched with the crankshaft rod, and the crankshaft rod is connected with the zipper mechanism.

Further for better realizing the utility model discloses, can realize carrying out the conversion between the state of laxing and the strong friction state between cam mechanism and the square guide rail, adopt the following structure that sets up very much: the zipper mechanism comprises a tension spring and a zipper, one end of the tension spring is connected to the anti-falling device body, the other end of the tension spring is connected with the zipper and connected with the cam mechanism to form the action fit, and the other end of the zipper is connected with the braking mechanism to form the action fit.

Further for realize better the utility model discloses, can be under the condition of braking for cam mechanism can form strong friction to square guide rail, and when not emergency braking, can not form the friction with square guide rail again, adopts the following structure that sets up very much: the cam mechanism comprises a cam and a cam shaft, the cam is arranged on the anti-falling device body through the cam shaft, the cam is connected with the zipper mechanism to form the action fit, and the cam shaft can be a rotating shaft to be far away from the square guide rail or form strong friction with the square guide rail.

Further for better realizing the utility model discloses, can make anti-falling device body can scientific and reasonable's setting on square guide rail, realize its purpose of operation from top to bottom, also can scientific and reasonable's installation of carrying out locking device simultaneously to realize locking the anti-falling device body on square guide rail under emergency braking's the condition, adopt the following structure that sets up very much: the anti-falling device body comprises a chain mounting seat and a guide wheel seat which are connected with each other, the chain mounting seat is arranged above the guide wheel seat, the guide wheel seat is matched on a square guide rail through a guide wheel, the braking mechanism is arranged on the chain mounting seat, and the cam mechanism and the zipper mechanism are matched and arranged on the guide wheel seat.

Further for better realizing the utility model discloses, can realize the upper and lower operation of anti-falling device body, adopt the following structure that sets up very much: the top of stand still is provided with the motor mount pad, is provided with the promotion motor on the motor mount pad, and the promotion motor is connected with the sprocket shaft, has the sprocket in the epaxial cooperation of sprocket, is provided with the promotion chain on the sprocket, and the one end that promotes the chain is connected with the chain mount pad, is connected with the counter weight at the other end that promotes the chain.

Further for realizing better the utility model discloses, adopt the following structure that sets up very much: an operating platform mounting seat is further arranged on the anti-falling device body, and an operating platform is arranged on the operating platform mounting seat.

In particular, in the present technical solution, terms such as "connect", "fix", "set", "movably connect", and "movably connect" related to the mechanical structure are all technical means for conventional setting in the mechanical field, and can be used as long as the purpose of fixing, connecting, or movably setting can be achieved, so that no specific limitation is made in the text (for example, nuts and screws are used to cooperate to perform movable or fixed connection, bolts are used to perform movable or fixed connection, and a detachable connection between an object a and an object B is achieved by means of clamping, and the like).

Compared with the prior art, the utility model, following advantage and beneficial effect have:

(1) the utility model discloses can be when emergency braking when the accident appears, with the locking of whole anti-falling device body on the square guide rail of stand under the effect of strong friction power to realize preventing the purpose of falling.

(2) The utility model discloses have good stability, in operation platform drive lift chain (promotion chain) fracture that in the twinkling of an eye, guarantee can not drop because of the effect of gravity at operation platform, obviously improved the security.

(3) The utility model discloses emergency braking when the accident appears prevents to break all cables with the welding head hookup, damages equipment circuit scheduling problem to guarantee the reliability of equipment.

Drawings

Figure 1 is a cross-sectional view of the fall arrest device body of the present invention.

Fig. 2 is the structure diagram of the utility model discloses combine operation platform, stand, promotion power supply part.

Fig. 3 is a schematic structural view of the combined column and the lifting power source part of the present invention.

The welding wire feeding device comprises an operation platform 1, a 2-barreled welding wire, a 3-lifting motor, a 4-counterweight, a 5-upright post mounting seat, a 6-lifting chain, a 7-motor mounting seat, an 8-chain wheel, a 9-chain wheel shaft, a 10-upright post, an 11-operation platform mounting seat, a 12-guide wheel seat, a 13-guide wheel, a 14-square guide rail, a 15-tension spring, a 16-zipper, a 17-crankshaft rod, an 18-cam, a 19-cam shaft, a 20-chain mounting seat and a 21-ejector rod.

Detailed Description

The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1:

be applied to operation platform lift anti-falling device of diaphragm type wall build-up welding special plane can be when emergency braking when the accident appears, with whole anti-falling device body locking on the square guide rail of stand under the effect of strong friction power to realize the purpose of preventing falling, as shown in fig. 1-3, set up on stand 10, including the anti-falling device body of cooperation on the square guide rail 14 of stand 10, be provided with locking device in the department of anti-falling device body and square guide rail 14 cooperation.

As a preferable arrangement scheme, the operation platform lifting anti-falling device is arranged on a column 10 of the special membrane wall overlaying machine, a square guide rail 14 is arranged on the column 10, an anti-falling device body of the operation platform lifting anti-falling device is matched on the square guide rail 14, a locking device is further arranged at the matching position of the anti-falling device body and the square guide rail 14, and the anti-falling device body can be tightly locked on the square guide rail 14 by the locking device in case of emergency.

Example 2:

this embodiment is further optimized on the basis of any above-mentioned embodiment, will not be repeated again in this technical scheme with the same technical structure position of adoption in the aforesaid technical scheme, and further for realizing better the utility model discloses, can realize can not carrying out emergency braking and locking the anti-falling device body on square guide rail when normal operating, and when the unexpected condition of appearing, can reach emergency braking to make the anti-falling device body lock on square guide rail under the effect of frictional force, as shown in fig. 1-3, adopt following setting structure in particular: the locking device comprises a cam mechanism, a zipper mechanism and a braking mechanism, the braking mechanism is matched with the zipper mechanism, the zipper mechanism is connected with the cam mechanism, and the cam mechanism is arranged on the anti-falling device body and can form strong friction with the square guide rail under the braking condition.

As a preferable arrangement scheme, the locking device mainly comprises a cam mechanism, a zipper mechanism and a brake mechanism, wherein the brake mechanism is used for providing emergency braking force and can be matched with the zipper mechanism to enable the cam mechanism and the square guide rail to be in a loose state when emergency braking does not exist; the zipper mechanism is bridged with the braking mechanism and the cam mechanism, and can enable the cam mechanism and the square guide rail to be in a loose state or a strong friction state under the matching of the braking mechanism; the cam mechanism realizes the action fit (a loose state or a strong friction state) with the square guide rail; when the anti-falling device is arranged, the cam mechanism, the zipper mechanism and the brake mechanism are arranged on the anti-falling device body in a matching state.

Example 3:

the present embodiment is further optimized on the basis of any of the above embodiments, and the technical structure parts that are the same as those in the above technical solution will not be described again in this technical solution, as shown in fig. 1 to 3, further for better realizing the present invention, when an accident occurs, an emergency braking force can be provided for the zipper mechanism and the cam mechanism; when no accident occurs, the zipper mechanism and the cam mechanism can be in a loose state between the zipper mechanism and the square guide rail, the normal up-and-down operation of the anti-falling device body can not be influenced, and the following arrangement structure is particularly adopted: the brake mechanism comprises a top rod 21 and a crankshaft rod 17, the top rod 21 is connected with and matched with the crankshaft rod 17, and the crankshaft rod 17 is connected with the zipper mechanism.

As a preferred arrangement, the brake mechanism is mainly composed of two parts, a carrier rod 21 and a crank rod 17. The ejector rod 21 is provided with a transverse pin, the crankshaft rod 17 is provided with a waist-shaped hole, when the anti-falling device is arranged, the transverse pin on the ejector rod 21 and the waist-shaped hole on the crankshaft rod 17 have a sliding connection distance of about 20mm, so that the crankshaft rod 17 can enable two ends of the crankshaft rod 17 to be positioned at the top of the anti-falling device body or parallel to the installation position of the crankshaft rod 17 on the anti-falling device body under the action of the ejector rod 21, and two ends of the crankshaft rod 17 are connected with the zipper mechanism.

Example 4:

this embodiment is further optimized on the basis of any above-mentioned embodiment, will not be repeated again in this technical scheme with adopting the same technical structure position among the aforementioned technical scheme, as shown in fig. 1-3, further for realizing better the utility model discloses, can realize carrying out the conversion between lax state and the strong friction state between cam mechanism and the square guide rail, adopt the following structure that sets up in particular: the zipper mechanism comprises a tension spring 15 and a zipper 16, one end of the tension spring 15 is connected to the anti-falling device body, the other end of the tension spring 15 is connected with the zipper 16 and connected with the cam mechanism to form the motion fit, and the other end of the zipper 16 is connected with the braking mechanism to form the motion fit.

Preferably, the zipper mechanism is mainly composed of two parts, namely a tension spring 15 and a zipper 16, when the zipper mechanism is arranged, one end of the tension spring 15 is connected with the cam mechanism, the other end of the tension spring 15 is connected with the anti-falling device body, one end of the zipper 16 is connected with the crank rod 17, and the other end of the zipper 16 is always at the part where the tension spring 15 is connected with the cam mechanism.

Example 5:

this embodiment is further optimized on the basis of any above-mentioned embodiment, will not be repeated again in this technical scheme with adopting the same technical structure position among the aforementioned technical scheme, as shown in fig. 1-3, further for realizing better the utility model discloses, can be under the circumstances of braking for cam mechanism can form strong friction to square guide rail, and when not emergency braking, can not form friction with square guide rail again, adopts the following structure that sets up in particular: the cam mechanism comprises a cam 18 and a cam shaft 19, the cam 18 is arranged on the anti-falling device body through the cam shaft 19, the cam 18 is connected with the zipper mechanism to form an action fit, and the cam 18 and the cam shaft 19 are rotating shafts and far away from the square guide rail 14 or form strong friction with the square guide rail 14.

As a preferable arrangement scheme, the cam mechanism mainly comprises two parts, namely a cam 18 and a cam shaft 19, the cam shaft 19 is arranged on the anti-falling device body, the cam 18 is sleeved on the cam shaft 19 and can rotate by taking the cam shaft 19 as a rotating shaft, and when the cam 18 is arranged on the cam shaft 19, the cam can be in close contact with the square guide rail 14 when rotating to a proper position so as to achieve the effect of strong friction, but can be far away from the square guide rail 14 when rotating to another proper position; wherein the cam 18 is distal to the end of the rail 14 for connecting the tension spring 15 and the zipper 16.

The middle part of the crankshaft rod 17 is movably connected with a top rod 21, two end parts of the crankshaft rod 17 are respectively connected with a cam 18 through a zipper 16, the cams 18 on two sides are provided with tension springs 15, the tension springs 15 are connected with the anti-falling device body, when the anti-falling device is arranged, at least one of the zipper 16, the cam 18 and the tension springs 15 on each side is arranged, when the anti-falling device is in a loose state, the top rod 21 jacks up the crankshaft rod 17, so that the end part of the crankshaft rod 17 is in a high position, the crankshaft rod 17 tensions the zipper 16, the tension springs 15 are further pulled open by the zipper 16, and the cam 18 is in an inclined shape obliquely upwards until the cam 18 cannot be contacted with the square guide rail 14; when emergency braking occurs, the ejector rod 21 will release force, so that the connecting end of the zipper 16 of the crankshaft 17 is infinitely close to the crankshaft 17 at the arrangement surface of the anti-falling device body, namely the end of the crankshaft 17 is highly lowered, the zipper 16 is loosened, the tension spring 15 is compressed, the cam 18 is driven to rotate downwards, strong friction (namely a braked state) is formed between the cam 18 and the square guide rail 14, the anti-falling device body is locked on the square guide rail 14, and the anti-falling purpose is achieved.

Example 6:

this embodiment is further optimized on the basis of any above-mentioned embodiment, will no longer describe in this technical scheme with adopting the same technical structure position among the aforementioned technical scheme, as shown in fig. 1 ~ 3, further for realizing better the utility model discloses, can make the anti-falling device body can scientific and reasonable's setting on square guide rail, realize its purpose of operation from top to bottom, also can scientific and reasonable's the installation of carrying out locking device simultaneously to realize locking the anti-falling device body on square guide rail under emergency braking's the condition, adopt following setting structure in particular: the anti-falling device body comprises a chain mounting seat 20 and a guide wheel seat 12 which are connected with each other, the chain mounting seat 20 is arranged above the guide wheel seat 12, the guide wheel seat 12 is matched on a square guide rail 14 through a guide wheel 13, the braking mechanism is arranged on the chain mounting seat, and the cam mechanism and the zipper mechanism are arranged on the guide wheel seat 12 in a matched mode.

As a preferable arrangement scheme, the anti-falling device body mainly comprises two parts, one is a chain installation seat 20, the other is a guide wheel seat 12, the chain installation seat 20 and the guide wheel seat 12 are connected with each other, the chain installation seat 20 is arranged above the guide wheel seat 12, a square guide rail 14 is arranged on at least two opposite sides of the upright post 10 (three sides of the upright post can also be arranged, but not limited to) the two sides of the upright post, the chain installation seat 20 and the guide wheel seat 12 are both sleeved on the outer side of the square guide rail 14, and the guide wheel seat 12 is matched on the square guide rail 14 through a guide wheel 13, so that the anti-falling device body can move up and down on the square guide rail under the friction force of the guide wheel 13; a group of cam mechanisms are respectively arranged on two sides of the guide wheel seat 12, the cam mechanism on each side is connected to the guide wheel seat 12 at the lower part of the cam mechanism through a tension spring 15, a push rod 21 and a crank rod 17 are arranged on a chain mounting seat 20, and a zipper 16 is connected between the crank rod 17 and a cam 18.

Example 7:

this embodiment is further optimized on the basis of any above-mentioned embodiment, will not be repeated again in this technical scheme with adopting the same technical structure position among the aforementioned technical scheme, as shown in fig. 1-3, further for realizing better the utility model discloses, can realize the upper and lower operation of anti-falling device body, adopt the following structure that sets up in particular: the top of stand 10 still is provided with motor mount pad 7, is provided with lifting motor 3 on motor mount pad 7, and lifting motor 3 is connected with sprocket shaft 9, and the cooperation has sprocket 8 on sprocket shaft 9, is provided with on sprocket 8 and promotes chain 6, and the one end that promotes chain 6 is connected with chain mount pad 20, is connected with counter weight 4 at the other end that promotes chain 6.

As the preferred arrangement scheme, still be provided with the promotion power supply on stand 10, the promotion power supply is including setting up motor mount pad 7 at the top of stand 10, setting up promotion motor 3 on motor mount pad 7, the sprocket shaft 9 of cooperation on promotion motor 3, the sprocket 8 of cooperation on sprocket shaft 9, be provided with on sprocket 8 and promote chain 6, promote the one end of chain 6 and be connected through the bolt with chain mount pad 20, there is counter weight 4 at the other end of promoting chain 6 through the bolt connection, there is 20mm sliding connection for the horizontal pin on the ejector pin 21 and the kidney type hole on the bent axle 17. When the chain is broken, the lifting chain 6 is separated from the chain mounting seat 20, the chain mounting seat 20 is separated from the ejector rod 21, the crank rod 17 and the zipper 16 are free from the acting force of the ejector rod 21, meanwhile, the tension spring 15 on the cam 18 pulls the cam 18 to rotate around the cam shaft 19 in the opposite direction, the long edge of the cam 18 is in contact with the square guide rail 14, and friction force between the cam 18 and the square guide rail 6 is formed, so that the operation platform is ensured not to drop suddenly and is locked at the position before the lifting chain 6 is broken, when the anti-falling device is used, under the control action of electrical equipment, the lifting motor 3 works, and the chain wheel shaft 9, the chain wheel 8 and the lifting chain 6 are matched to carry out lifting or dropping operation on the anti-.

Example 8:

this embodiment is further optimized on the basis of any of the above-mentioned embodiments, and will not be repeated again in this technical scheme with adopting the same technical structure position among the aforementioned technical scheme, as shown in fig. 1-3, the further realization that is better the utility model discloses, adopt the following structure that sets up in particular: an operation platform installation seat 11 is further arranged on the anti-falling device body, and an operation platform 1 is arranged on the operation platform installation seat 11.

As a preferable arrangement scheme, an operation platform installation seat 11 is movably or fixedly arranged on the outer side of a guide wheel seat 12 or the whole outer side formed by the guide wheel seat 12 and a chain installation seat 20, an operation platform 1 is further arranged on the operation platform installation seat 11, and the operation platform 1 can be used for placing barreled welding wires 2; a column mounting base 5 is also provided on the upper portion of the column 10.

The fall-preventing device prevents the operation platform 1 from falling down by generating a strong frictional force between the cam 18 and the square rail 14. The working principle is as follows: when the lifting chain 6 is not broken, the chain mounting seat 20 is pulled by the lifting chain 6, the chain mounting seat 20 tightly supports the ejector rod 21, the ejector rod 21 pushes the crank rod 17 to rotate, the zipper 16 pulls the cam 18 to rotate in the rotating process, and the short edge of the cam 18 is far away from the square guide rail 14 to form a gap between the cam 18 and the square guide rail 14, so that the operation platform 1 combined with the anti-falling device body can be normally lifted by the driving of the lifting motor 3; when the lifting chain 6 is disconnected, the lifting chain 6 is separated from the chain mounting seat 20, the chain mounting seat 20 is separated from the ejector rod 21, the crank rod 17 and the zipper 16 are free from the acting force of the ejector rod 21, meanwhile, the tension spring 15 on the cam 18 pulls the cam 18 to rotate around the cam shaft 19 in the opposite direction, and the long edge of the cam 18 contacts the square guide rail 14 to form friction force between the cam 18 and the square guide rail 14, so that the operation platform 1 is ensured not to drop suddenly.

The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.

Claims (9)

1. Be applied to operation platform lift anti-falling device of diaphragm type wall build-up welding special plane, set up on stand (10), its characterized in that: the anti-falling device comprises an anti-falling device body matched on a square guide rail (14) of an upright post (10), wherein a locking device is arranged at the matching part of the anti-falling device body and the square guide rail (14); the locking device comprises a cam mechanism, a zipper mechanism and a braking mechanism, the braking mechanism is matched with the zipper mechanism, the zipper mechanism is connected with the cam mechanism, and the cam mechanism is arranged on the anti-falling device body and can form strong friction with the square guide rail under the braking condition.

2. The operation platform lifting fall-preventing device applied to the special membrane wall overlaying machine according to claim 1, wherein the operation platform lifting fall-preventing device comprises: the brake mechanism comprises a mandril (21) and a crankshaft rod (17), the mandril (21) is connected and matched with the crankshaft rod (17), and the crankshaft rod (17) is connected with the zipper mechanism.

3. The operation platform lifting fall-preventing device applied to the special membrane wall overlaying machine as claimed in claim 1 or 2, wherein: the zipper mechanism comprises a tension spring (15) and a zipper (16), one end of the tension spring (15) is connected to the anti-falling device body, the other end of the tension spring (15) is connected with the zipper (16) and connected with the cam mechanism to form the motion fit, and the other end of the zipper (16) is connected with the braking mechanism to form the motion fit.

4. The operation platform lifting fall-preventing device applied to the special membrane wall overlaying machine as claimed in claim 1 or 2, wherein: the cam mechanism comprises a cam (18) and a cam shaft (19), the cam (18) is arranged on the anti-falling device body through the cam shaft (19), the cam (18) is connected with the zipper mechanism to form the action fit, and the cam (18) can be far away from the square guide rail (14) or form strong friction with the square guide rail (14) by taking the cam shaft (19) as a rotating shaft.

5. The operation platform lifting fall-preventing device applied to the special membrane wall overlaying machine according to claim 3, wherein the operation platform lifting fall-preventing device comprises: the cam mechanism comprises a cam (18) and a cam shaft (19), the cam (18) is arranged on the anti-falling device body through the cam shaft (19), the cam (18) is connected with the zipper mechanism to form the action fit, and the cam (18) can be far away from the square guide rail (14) or form strong friction with the square guide rail (14) by taking the cam shaft (19) as a rotating shaft.

6. The device for preventing the lifting and falling of the operation platform applied to the special membrane wall overlaying machine as claimed in claim 1, 2 or 5, wherein: the anti-falling device body comprises a chain mounting seat (20) and a guide wheel seat (12) which are connected with each other, the chain mounting seat (20) is arranged above the guide wheel seat (12), the guide wheel seat (12) is matched on a square guide rail (14) through a guide wheel (13), the braking mechanism is arranged on the chain mounting seat, and the cam mechanism and the zipper mechanism are arranged on the guide wheel seat (12) in a matched mode.

7. The operation platform lifting fall-preventing device applied to the special membrane wall overlaying machine according to claim 3, wherein the operation platform lifting fall-preventing device comprises: the anti-falling device body comprises a chain mounting seat (20) and a guide wheel seat (12) which are connected with each other, the chain mounting seat (20) is arranged above the guide wheel seat (12), the guide wheel seat (12) is matched on a square guide rail (14) through a guide wheel (13), the braking mechanism is arranged on the chain mounting seat, and the cam mechanism and the zipper mechanism are arranged on the guide wheel seat (12) in a matched mode.

8. The operation platform lifting fall-preventing device applied to the special membrane wall overlaying machine according to claim 6, wherein the operation platform lifting fall-preventing device comprises: the top of stand (10) still is provided with motor mount pad (7), is provided with lifting motor (3) on motor mount pad (7), and lifting motor (3) are connected with sprocket shaft (9), have sprocket (8) on sprocket shaft (9) the cooperation, are provided with on sprocket (8) and promote chain (6), and the one end that promotes chain (6) is connected with chain mount pad (20), is connected with counter weight (4) at the other end that promotes chain (6).

9. The device for preventing the lifting and falling of the operation platform applied to the special membrane wall overlaying machine according to the claim 1, 2, 5, 7 or 8, wherein: an operation platform installation seat (11) is further arranged on the anti-falling device body, and an operation platform (1) is arranged on the operation platform installation seat (11).

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