Safety lock with flexible anti-falling device adaptive to multi-specification angle steel dimensions

Abstract

The utility model provides a safety lock with a flexible anti-falling device adaptive to multi-specification angle steel sizes, which relates to the technical field of safety protection and comprises a lock body, a lock block and an anti-retreating mechanism. The lock block is in sliding connection with the lock body, the lock block and the lock body are matched to define a clamping space which is adjustable in size and used for containing angle steel, and one side of the clamping space is provided with an opening for the angle steel to enter and exit; the anti-retreating mechanism is connected to the lock body and the lock block at the same time, the anti-retreating mechanism has a first working state and a second working state which are switched mutually, and when the anti-retreating mechanism is in the first working state, the lock block can slide in a reciprocating mode in the first direction and the second direction relative to the lock body; and in the second working state, the lock block can only slide in the first direction relative to the lock body so as to reduce the size of the clamping space. The safety lock is simple in structure, convenient to operate and good in protection effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of safety protection, specifically, relates to a safety lock. BACKGROUND

[0002] At present, as the main artery of electric energy transmission, overhead transmission line needs to eliminate overhead transmission line fault by tower climbing operation to ensure extremely high operation reliability, however, there are problems such as low coverage of existing transmission line anti-falling guide rail, uneven quality of suppliers and time-consuming and laborious alternate use of safety belts in the tower climbing operation process, which seriously affect the operation safety of tower climbing personnel. In the prior art, the pole tower anti-falling device used in the overhead transmission line maintenance or repair includes a foot nail, a safety belt and an anti-falling hook, and in the use process, the tower climbing operator alternately uses the anti-falling safety belt to climb the iron tower step by step.

[0003] The inventor found that the anti-falling system of the related art at least has the following disadvantages:

[0004] When working at high altitudes, the safety rope is connected to the worker's body, and the worker needs to alternately use the anti-falling hook to climb step by step, which is labor-intensive, time-consuming and laborious, and seriously affects the work efficiency and safety of the worker. CONTENT OF THE UTILITY MODEL

[0005] The purpose of the utility model includes providing a safety lock capable of adapting to the size of flexible anti-falling device of multiple specifications of angle steel, which can reduce the operation intensity and improve the efficiency and safety of high-altitude operation.

[0006] The embodiment of the utility model can be implemented as follows:

[0007] In a first aspect, the utility model provides a safety lock, which comprises:

[0008] A lock body, a lock block and an anti-backoff mechanism; the lock block is in sliding connection with the lock body, the lock block and the lock body cooperate to define a size-adjustable clamping space for accommodating the angle steel, one side of the clamping space is provided as an open mouth for the angle steel to enter and exit; the anti-backoff mechanism is connected to the lock body and the lock block at the same time, the anti-backoff mechanism has a first working state and a second working state which are switched with each other, when in the first working state, the lock block can reciprocate in a first direction and a second direction relative to the lock body; when in the second working state, the lock block can only slide in the first direction relative to the lock body to reduce the size of the clamping space; the first direction and the second direction are opposite.

[0009] In an optional embodiment, the anti-backup mechanism comprises a rack and an anti-backup block, the rack is installed on the lock body, and the rack is provided with a plurality of inclined teeth arranged in the first direction or the second direction; the anti-backup block is provided with a clamping tooth, and the anti-backup block is rotatably connected with the lock block; when the anti-backup mechanism is in the first working state, the clamping tooth is separated from the inclined teeth; when the anti-backup mechanism is in the second working state, the clamping tooth is clamped with one of the plurality of inclined teeth.

[0010] Based on the above scheme, the movement state of the lock block can be adjusted by the cooperation of the anti-backup block and the rack, that is, when the clamping tooth on the anti-backup block is clamped with the inclined tooth on the rack, at this time, the lock block can only move towards the direction of reducing the size of the clamping space, so as to clamp the angle steel. When the safety lock needs to be removed, the clamping tooth on the anti-backup block is separated from the inclined tooth on the rack, and the lock block can be retracted together with the anti-backup block, so as to increase the clamping space. The lock block and the lock body lose the clamping force of clamping the angle steel, and the angle steel is easy to be taken out of the clamping space.

[0011] In an optional embodiment, the anti-backup mechanism further comprises a counterweight, a first cable, a second cable and a lifting rod, the counterweight and the lifting rod are slidably connected with the lock body in the third direction, and the counterweight and the lifting rod are located on both sides of the anti-backup block in the first direction; the anti-backup block has a first end and a second end oppositely arranged in the first direction, one end of the first cable is connected with the counterweight, and the other end of the first cable is connected with the first end; one end of the second cable is connected with the lifting rod, and the other end of the second cable is connected with the second end; the gravity of the lifting rod is greater than the gravity of the counterweight, so that the anti-backup block has a rotating tendency to clamp the clamping tooth with the inclined tooth, and the lock block has a tendency to move in the first direction; when the lifting rod is lifted by applying force, the anti-backup block is rotated under the action of the counterweight to make the clamping tooth away from the inclined tooth, and the lock block is driven to move in the second direction.

[0012] Based on the above scheme, when the safety lock is hoisted to high altitude by the unmanned aerial vehicle or other equipment, the unmanned aerial vehicle is connected with the pull rod, the gravity of the pull rod is balanced by the unmanned aerial vehicle, at this time, under the action of the force of the counterweight, the anti-back-off piece and the lock block are pulled by the first cable to move in the second direction, the lock block moves to the initial position, at this time, the size of the clamping space is maximum, the width of the opening is maximum, which is beneficial to the angle steel entering the clamping space from the opening. After the angle steel horizontally arranged at the top of the tower enters the clamping space, the unmanned aerial vehicle descends, the safety lock as a whole descends, when the lock body of the safety lock overlaps on the angle steel, the unmanned aerial vehicle continues to descend, the gravity of the pull rod is not balanced by the unmanned aerial vehicle, because the gravity of the pull rod is greater than the gravity of the counterweight, the anti-back-off piece is pulled by the second cable, the anti-back-off piece is rotated to the state that the tooth is engaged with the inclined tooth, and the anti-back-off piece and the lock block can be moved in the first direction together through the second cable, the clamping space is gradually reduced, until the lock block and the lock body clamp the angle steel, the lock block cannot continue to move in the first direction, and because of the action of the gravity of the pull rod, the tooth is always engaged with the inclined tooth, the lock block cannot back off in the second direction, and the safety lock cannot be loosened from the angle steel, so that the protection is safe and reliable.

[0013] In an optional embodiment, a first pulley is mounted on the lock body, and the first cable is wound on the first pulley; the first end is provided with a first connecting portion connected with the first cable; the height of the position of the first cable in contact with the first pulley is lower than the height of the first connecting portion.

[0014] Based on the above scheme, under the action of the gravity of the counterweight, when the anti-back-off piece is pulled by the first cable, the first end of the anti-back-off piece is rotated downward, and the second end of the anti-back-off piece is correspondingly rotated upward, so that the tooth on the second end can smoothly leave the inclined tooth on the rack, thereby ensuring that the lock block can move in the second direction to increase the clamping space.

[0015] In an optional embodiment, a second pulley is mounted on the lock body, and the second cable is wound on the second pulley; the second end is provided with a second connecting portion connected with the second cable; the height of the position of the second cable in contact with the second pulley is lower than the height of the second connecting portion.

[0016] Based on the above scheme, when the safety lock is installed on the angle steel or the like, under the action of the gravity of the pull rod, the second end of the anti-back-off piece is rotated downward, and the first end of the anti-back-off piece is correspondingly rotated upward, the tooth on the second end can be smoothly engaged in the inclined tooth, so that the anti-back-off piece can slide in the first direction together with the lock block to reduce the size of the clamping space, but the anti-back-off piece cannot back off in the second direction, thereby achieving one-way locking, and improving the safety and reliability of the cooperation between the safety lock and the angle steel.

[0017] In an optional embodiment, the anti-backup mechanism further comprises a protective cover connected with the lock body, and the rack and the anti-backup piece are located in the protective cover.

[0018] Based on the above scheme, the protective cover plays a protective role, avoiding the rack and the anti-backup piece being disturbed by the external environment, improving the safety of the rack and the anti-backup piece and the like, and prolonging the service life of the safety lock.

[0019] In an optional embodiment, the lock body is provided with a lock slot having a first side wall and a second side wall oppositely arranged in the first direction, and the lock block cooperates with the second side wall to define the clamping space; and the first side wall is provided with a receiving groove for accommodating the lock block.

[0020] Based on the above scheme, by arranging the receiving groove, the lock block enters the receiving groove when it is in the initial position, and the lock block itself does not occupy the clamping space, thereby improving the size of the clamping space when it is in the maximum state and improving the use range of the clamping space.

[0021] In an optional embodiment, the first side wall is provided with a guide slope for guiding the angle steel into the clamping space.

[0022] Based on the above scheme, by arranging the guide slope, when the safety lock is lowered from above the angle steel to make the angle steel enter the clamping space from the opening, the angle steel contacts the guide slope, and under the guidance of the guide slope, the angle steel is more easily guided into the clamping space, and the angle steel is less likely to be blocked by the lock body, so that the angle steel is more smoothly guided into the clamping space.

[0023] In an optional embodiment, the lock block has a side surface facing the second side wall, and a anti-falling protrusion is arranged on the side surface for contacting the bottom of the angle steel to prevent the angle steel from being taken out of the clamping space from the opening.

[0024] Based on the above scheme, when the lock block cooperates with the second side wall of the lock body to clamp the angle steel, the freedom of the angle steel in the first direction and the second direction is limited, and at the same time, due to the cooperation of the anti-falling protrusion and the groove bottom wall of the lock slot, the freedom of the angle steel in the height direction relative to the lock body is also limited, thereby improving the combination firmness of the angle steel and the safety lock and reducing the probability of the angle steel being taken out of the clamping space.

[0025] In an optional embodiment, the safety lock further comprises a sliding rail and a sliding block, the sliding rail is installed on the lock body, the sliding block is slidably connected with the sliding rail in the first direction and the second direction, and the lock block is installed on the sliding block.

[0026] Based on the above scheme, the sliding block slides along the sliding rail stably, thereby enabling the lock block and the anti-backup piece to slide stably.

[0027] The safety lock has the advantages that:

[0028] In conclusion, the safety lock can be applied to high-altitude operation and the like, the safety lock can deliver the anti-falling rope to a high place, and the anti-falling rope is connected to an angle steel at the high place by the safety lock, so that the anti-falling rope is always combined with the operator when the high-altitude operator climbs, the operator is not unprotected by the anti-falling rope, and the safety of high-altitude operation is high. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 The structure diagram of the safety lock provided in the present embodiment is shown in the figure.

[0031] Figure 2 The structure diagram of the safety lock provided in the present embodiment is shown in the figure.

[0032] Figure 3 The structure diagram of the safety lock provided in the present embodiment is shown in the figure.

[0033] Figure 4 The structure diagram of the safety lock provided in the present embodiment is shown in the figure.

[0034] Figure 5 The structure diagram of the safety lock provided in the present embodiment is shown in the figure.

[0035] Figure 6 The structure diagram of the safety lock provided in the present embodiment is shown in the figure.

[0036] Figure 7 The structure diagram of the safety lock provided in the present embodiment is shown in the figure.

[0037] Icon:

[0038] 001 - first direction; 002 - second direction; 003 - clamping space; 004 - opening; 100 - lock body; 110 - first rod; 111 - guide slope; 112 - receiving groove; 120 - second rod; 121 - strip-shaped hole; 130 - third rod; 140 - first pulley; 150 - second pulley; 160 - inclined plate; 200 - lock block; 210 - base; 220 - anti-back protrusion; 230 - connecting rod; 300 - anti-back mechanism; 310 - rack; 311 - oblique tooth; 320 - anti-back block; 321 - first end; 322 - second end; 323 - clamping tooth; 330 - counterweight; 340 - first pull cable; 350 - second pull cable; 360 - pull rod; 400 - slide rail; 500 - slide block; 600 - protective cover. DETAILED DESCRIPTION

[0039] In the prior art, when working at a high altitude, the anti-falling rope is sleeved on the worker and the anti-falling hook, and the worker needs to alternately perform the operations of hooking the anti-falling hook on the angle steel and taking the anti-falling hook off the angle steel, so that when the anti-falling hook is separated from the angle steel, the worker is not protected by the anti-falling rope, and there is a safety hazard.

[0040] Therefore, the designer provides a safety lock, which can ensure that the anti-falling rope can always connect the angle steel and the worker when the worker performs high-altitude climbing and the like, and a protection vacuum period is not prone to occur, and the safety lock is safe and reliable to use.

[0041] To make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0043] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] In the description of the utility model, it needs to be explained that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0045] In addition, if the terms "first", "second" and the like are used only to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0046] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.

[0047] It should be understood that the safety lock provided in the embodiment can be applied to high-altitude operation protection scenarios, and can also be applied to high-altitude lighthouse action scenarios, etc., which are not limited in the embodiment. Moreover, the use of the safety lock can be matched with a carrier such as a drone, and the safety lock can be transported to a specified height by using the drone. At the same time, the drone and the safety lock can be separated, that is, after the safety lock is transported to the specified height by using the drone and matched with other horizontally arranged structural members such as angle steels, the drone can be separated from the safety lock, the safety lock is hung on the angle steel, and the drone returns.

[0048] Please combine Figures 1-7 In the embodiment, the safety lock comprises a lock body 100, a lock block 200 and a retreat prevention mechanism 300. The lock block 200 is slidably connected with the lock body 100, and the lock block 200 and the lock body 100 cooperatively define a size-adjustable clamping space 003 for accommodating the horizontally arranged angle steel at the top of the angle steel tower, one side of the clamping space 003 is provided as an opening 004 for the angle steel to enter and exit; the retreat prevention mechanism 300 is connected to the lock body 100 and the lock block 200 at the same time, and the retreat prevention mechanism 300 has a first working state and a second working state which are switched with each other, when in the first working state, the lock block 200 can reciprocally slide relative to the lock body 100 in a first direction 001 and a second direction 002; when in the second working state, the lock block 200 can only slide relative to the lock body 100 in the first direction 001 to reduce the size of the clamping space 003; the first direction 001 and the second direction 002 are opposite.

[0049] As described above, the use mode of the safety lock provided in the embodiment includes, for example:

[0050] The bottom of the safety lock can be connected with a flexible anti-falling rope, the safety lock is transported to a specified height by using a drone, so as to be matched with an angle steel, the safety lock is hung on the angle steel, and the connection between the anti-falling rope and the angle steel is realized. Please combine Figure 2 andFigure 3 wherein, Figure 2 Schematic diagram of the lock block 200 of the safety lock moving in the first direction 001 to set the distance to clamp the angle steel, Figure 3 Schematic diagram of the lock block 200 of the safety lock moving in the second direction 002 to the initial position to facilitate the angle steel to enter the clamping space 003. Specifically, the size of the clamping space 003 is adjusted to the maximum state, that is, the lock block 200 moves to the limit position in the second direction 002, and since the size of the clamping space 003 is maximum, even if the size of the angle steel is large, it can also enter the clamping space 003 from the opening 004. After the angle steel enters the clamping space 003, the anti-back mechanism 300 is switched to the second working state, so that the lock block 200 moves in the first direction 001 in one direction, that is, the lock block 200 can only move in the first direction 001 to reduce the size of the clamping space 003, so that the lock block 200 and the lock body 100 cooperate to clamp the angle steel, and the lock block 200 cannot move in the second direction 002 to increase the size of the clamping space 003, thereby ensuring the stability of the lock block 200 and the lock body 100 cooperating to clamp the angle steel, and the angle steel is not easy to come out of the clamping space 003, and the safety protection is high. When the safety lock is completed with the angle steel, the safety lock is used to connect the fall protection rope with the angle steel at a high place, and the fall protection rope is always combined with the worker during the climbing of the worker, so that the worker is not protected by the fall protection rope, and the safety of the high-altitude work is high.

[0051] The following examples illustrate the details of the safety lock of the present application.

[0052] Please combine Figure 4 In the embodiment, the lock body 100 includes a first rod 110, a second rod 120 and a third rod 130 connected in sequence, the first rod 110 and the third rod 130 are located at both ends of the second rod 120 and are arranged in parallel and spaced apart, and the first rod 110, the second rod 120 and the third rod 130 cooperate to define a lock slot, the slot opening of the lock slot is away from the second rod 120, and the slot opening of the lock slot is the opening 004. The side wall of the first rod 110 facing the third rod 130 is a first side wall, the side wall of the third rod 130 facing the first rod 110 is a second side wall, and the side wall of the second rod 120 facing the slot opening is a slot bottom wall. The first side wall is provided with a guide inclined surface 111, the guide inclined surface 111 is provided, so that the width of the opening 004 is maximum, and the distance between the guide inclined surface 111 and the second side wall gradually decreases in the direction from the opening 004 to the slot bottom. In this way, when the angle steel enters the clamping space 003 from the opening 004, it is not easy to interfere with the first rod 110.

[0053] Further, the first side wall is provided with a receiving groove 112 for accommodating the locking block 200. That is, when the locking block 200 moves in the second direction 002 to increase the size of the clamping space 003, the locking block 200 enters the receiving groove 112, and the locking block 200 itself does not occupy the clamping space 003, thereby improving the size of the clamping space 003 when it is at the maximum, and improving the use range of the clamping space 003.

[0054] It should be understood that the guide slope 111 can be formed by the side surface of the inclined plate 160 provided on the first rod 110, and in addition, the receiving groove 112 can be formed by the two opposite inclined plates 160 provided on the first rod 110, which is selected as needed, and is flexible and convenient to manufacture. For example, two opposite inclined plates 160 are provided on the first rod 110, and each inclined plate 160 is provided with a guide slope 111 on the side close to the third rod 130, and the two inclined plates 160 have a spacing therebetween, and the first rod 110 and the two inclined plates 160 cooperate to define the receiving groove 112. The inclined plate 160 can be provided as a hollow plate to reduce weight.

[0055] Further, the second rod 120 is provided with two parallel strip-shaped holes 121, and the length of the strip-shaped hole 121 extends in the first direction 001 or the second direction 002. The two strip-shaped holes 121 are provided with a sliding rail 400 extending in the first direction 001. The bottom of the sliding rail 400 is provided with a sliding groove, which is a dovetail groove or a T-shaped groove, and the sliding groove is provided with a sliding block 500. The locking block 200 is arranged in the two strip-shaped holes 121 at the same time, and the locking block 200 is fixedly connected with the sliding block 500. The sliding block 500 and the sliding rail 400 cooperate to guide the sliding of the locking block 200, and the sliding of the locking block 200 is more stable.

[0056] Optionally, a first pulley 140 and a second pulley 150 are respectively arranged at two ends of the second rod 120, the first pulley 140 is close to the first rod 110, and the second pulley 150 is close to the third rod 130.

[0057] Optionally, a protective cover 600 is arranged on the top of the second rod 120, and the protective cover 600 and the second rod 120 cooperate to define a mounting cavity, and part of the anti-back mechanism 300 is located in the mounting cavity, thereby reducing the probability that the anti-back mechanism 300 is affected by the external environment.

[0058] Please refer to Figure 5In the embodiment, the lock block 200 includes a base 210, a retreat prevention protrusion 220, and two connecting rods 230. The base 210 is located in the lock slot and is fixedly connected to the sliding block 500 below the sliding block 500. The base 210 has a side wall facing the third rod 130, and the retreat prevention protrusion 220 is arranged on the side wall. The top of the retreat prevention protrusion 220 has a spacing from the bottom surface of the second rod 120. The two connecting rods 230 are fixedly connected to the base 210 and are arranged in the two strip-shaped holes 121, respectively. It should be understood that the base 210, the retreat prevention protrusion 220, and the two connecting rods 230 can be arranged as an integrated structure, which has high overall structural strength and long service life.

[0059] Please refer to Figure 6 and Figure 7 In the embodiment, the retreat prevention mechanism 300 includes a rack 310, a retreat prevention block 320, a counterweight 330, a first pull cable 340, a second pull cable 350, and a pull rod 360. The rack 310 is installed on the second rod 120, specifically, above the sliding rail 400 and between the two strip-shaped holes 121. The rack 310 is provided with a plurality of inclined teeth 311 arranged in the first direction 001 or the second direction 002. The retreat prevention block 320 is provided with a clamping tooth 323. The retreat prevention block 320 is rotatably connected to the two connecting rods 230 of the lock block 200, that is, the retreat prevention block 320 is rotatably installed between the two connecting rods 230 through a rotating shaft. When the retreat prevention mechanism 300 is in the first working state, the clamping tooth 323 is separated from the inclined teeth 311. When the retreat prevention mechanism 300 is in the second working state, the clamping tooth 323 is clamped with one of the plurality of inclined teeth 311.

[0060] Meanwhile, the counterweight 330 and the pull rod 360 are slidably matched with the lock body 100 in the third direction, and are located on both sides of the anti-back block 320 in the first direction 001. Specifically, the counterweight 330 is slidably matched with the first rod 110, and the pull rod 360 is slidably matched with the third rod 130. The anti-back block 320 has a first end 321 and a second end 322 oppositely arranged in the first direction 001. One end of the first cable 340 is connected with the counterweight 330, and the other end of the first cable 340 is connected with the first end 321. The first cable 340 passes around the first pulley 140. One end of the second cable 350 is connected with the pull rod 360, and the other end of the second cable 350 is connected with the second end 322. The second cable 350 passes around the second pulley 150. In addition, the gravity of the pull rod 360 is greater than the gravity of the counterweight 330, so that the anti-back block 320 has a rotating tendency to make the clamping teeth 323 be clamped with the inclined teeth 311, and the lock block 200 has a tendency to move towards the first direction 001. When the pull rod 360 is forced to rise, the anti-back block 320 is rotated under the action of the counterweight 330 to make the clamping teeth 323 leave the inclined teeth 311, and the lock block 200 is driven to move towards the second direction 002.

[0061] It should be understood that when the safety lock is hoisted to a high altitude by a drone or other equipment, the drone is connected with the pull rod 360, and the gravity of the pull rod 360 is balanced by the drone. At this time, the anti-back block and the lock block 200 are driven to move together along the second direction 002 by the first cable 340 under the action of the counterweight 330, and the lock block 200 moves to the initial position. At this time, the size of the clamping space 003 is the largest, and the width of the opening 004 is the largest, which is beneficial for the angle steel to enter the clamping space 003 from the opening 004. When the angle steel enters the clamping space 003, the drone descends, and the safety lock as a whole descends. When the lock body of the safety lock is overlapped on the angle steel, the drone continues to descend, and the gravity of the pull rod 360 is not balanced by the drone. Since the gravity of the pull rod 360 is greater than the gravity of the counterweight 330, the anti-back block is driven to rotate to the state that the clamping teeth 323 are clamped with the inclined teeth 311 by the second cable 350, and the anti-back block and the lock block 200 can be driven to move together along the first direction 001 by the second cable 350, so as to gradually reduce the clamping space 003, until the lock block 200 and the lock body 100 cooperate to clamp the angle steel. The lock block 200 cannot continue to move along the first direction 001, and the clamping teeth 323 are always clamped with the inclined teeth 311 due to the gravity of the pull rod 360, so the lock block 200 will not retreat to the second direction 002, and the safety lock will not be loosened from the angle steel, which is safe and reliable.

[0062] Further, the first end 321 is provided with a first connecting portion connected with the first cable 340; the height of the position of the first cable 340 in contact with the first pulley 140 is lower than the height of the first connecting portion. The second end 322 is provided with a second connecting portion connected with the second cable 350; the height of the position of the second cable 350 in contact with the second pulley 150 is lower than the height of the second connecting portion. Under the action of the gravity of the counterweight 330, when the anti-back-off piece is pulled by the first cable 340, the first end 321 of the anti-back-off piece rotates downward, and the second end 322 of the anti-back-off piece rotates upward correspondingly, so that the pawl 323 on the second end 322 can smoothly leave the inclined teeth 311 on the rack 310, thereby ensuring that the lock block 200 can move in the second direction 002 to increase the clamping space 003. When the safety lock is installed on the angle steel, under the action of the gravity of the lifting rod 360, the second end 322 of the anti-back-off piece is pulled downward by the second cable 350, and the first end 321 of the anti-back-off piece rotates upward correspondingly, so that the pawl 323 on the second end 322 can be smoothly engaged in the inclined teeth 311, so that the anti-back-off piece can slide along with the lock block 200 in the first direction 001 to reduce the size of the clamping space 003, but the anti-back-off piece cannot back off in the second direction 002, thereby achieving one-way locking and improving the safety and reliability of the safety lock and the angle steel.

[0063] In the embodiment, the safety lock is automatically locked with the angle steel through the cooperation of the lock block 200 and the lock body 100, so that the safety lock is firmly hung on the angle steel. During use, the lock block 200 is not easy to automatically back off due to the action of the anti-back-off mechanism 300, the locking effect is good, and the safety is high. When the safety lock needs to be removed, the unmanned aerial vehicle is connected with the lifting rod 360, the lifting rod 360 is pulled up, the anti-back-off piece rotates to make the pawl 323 leave the inclined teeth 311 under the action of the counterweight 330, and the anti-back-off piece and the lock block 200 can back off together in the second direction 002, so that the lock block 200 releases the angle steel, the unmanned aerial vehicle lifts the safety lock, and the safety lock can be separated from the angle steel, thereby improving the operation convenience.

[0064] The above merely illustrates the specific implementation manner of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which shall be covered within the protection scope of the present application.

Claims

1. A safety lock for flexible fall arrest device to adapt to the size of angle steel, characterized in that, The safety lock comprises a lock body (100), a lock block (200) and a retreat prevention mechanism (300); the lock block (200) is in sliding connection with the lock body (100), the lock block (200) and the lock body (100) cooperatively define a size-adjustable clamping space (003) for accommodating an angle steel arranged horizontally at the top of an angle steel tower, one side of the clamping space (003) is provided as an opening (004) for the angle steel to enter and exit; the retreat prevention mechanism (300) is connected to the lock body (100) and the lock block (200) simultaneously, the retreat prevention mechanism (300) has a first working state and a second working state which are switched with each other, when in the first working state, the lock block (200) can reciprocally slide relative to the lock body (100) in a first direction (001) and a second direction (002); when in the second working state, the lock block (200) can only slide relative to the lock body (100) in the first direction (001) to reduce the size of the clamping space (003); the first direction (001) and the second direction (002) are opposite.

2. The safety lock according to claim 1, wherein: the retreat prevention mechanism (300) comprises a rack (310) and a retreat prevention block (320), the rack (310) is installed on the lock body (100), the rack (310) is provided with a plurality of inclined teeth (311) arranged in the first direction (001) or the second direction (002); the retreat prevention block (320) is provided with a clamping tooth (323), the retreat prevention block (320) is rotatably matched with the lock block (200); when the retreat prevention mechanism (300) is in the first working state, the clamping tooth (323) is separated from the inclined teeth (311); when the retreat prevention mechanism (300) is in the second working state, the clamping tooth (323) is clamped with one of the plurality of inclined teeth (311).

3. The safety lock according to claim 2, wherein: ​ ​ The anti-backup mechanism (300) further comprises a counterweight (330), a first cable (340), a second cable (350) and a lifting rod (360), the counterweight (330) and the lifting rod (360) are slidably matched with the lock body (100) in a third direction, the counterweight (330) and the lifting rod (360) are located on both sides of the anti-backup block (320) in the first direction (001); the anti-backup block (320) has a first end (321) and a second end (322) oppositely arranged in the first direction (001), one end of the first cable (340) is connected with the counterweight (330), the other end of the first cable (340) is connected with the first end (321); one end of the second cable (350) is connected with the lifting rod (360), the other end of the second cable (350) is connected with the second end (322); the gravity of the lifting rod (360) is greater than that of the counterweight (330), so that the anti-backup block (320) has a rotating tendency to make the clamping tooth (323) be clamped with the inclined tooth (311), and the lock block (200) has a tendency to move towards the first direction (001); when the lifting rod (360) is forced to rise, the anti-backup block (320) rotates under the action of the counterweight (330) to make the clamping tooth (323) away from the inclined tooth (311), and drives the lock block (200) to move towards the second direction (002).

4. The safety lock according to claim 3, wherein: A first pulley (140) is installed on the lock body (100), and the first cable (340) is wound around the first pulley (140); the first end (321) is provided with a first connecting portion connected with the first cable (340); the height of the position of the first cable (340) contacting the first pulley (140) is lower than the height of the first connecting portion.

5. The safety lock according to claim 3, wherein: A second pulley (150) is installed on the lock body (100), and the second cable (350) is wound around the second pulley (150); the second end (322) is provided with a second connecting portion connected with the second cable (350); the height of the position of the second cable (350) contacting the second pulley (150) is lower than the height of the second connecting portion.

6. The safety lock according to claim 2, wherein: The anti-backup mechanism (300) further comprises a protective cover (600), the protective cover (600) is connected with the lock body (100), and the rack (310) and the anti-backup member are located in the protective cover (600).

7. The safety lock according to claim 1, wherein: The lock body (100) is provided with a lock slot having a first side wall and a second side wall oppositely arranged in a first direction (001), and the lock block (200) cooperates with the second side wall to define the clamping space (003); the first side wall is provided with a receiving groove (112) for accommodating the lock block (200).

8. The safety lock according to claim 7, characterized in that: The first side wall is provided with a guide slope (111) for guiding the angle steel into the clamping space (003).

9. The safety lock according to claim 7, characterized in that: The lock block (200) has a side surface facing the second side wall, and the side surface is provided with an anti-falling protrusion for contacting the bottom of the angle steel to prevent the angle steel from falling out of the clamping space (003) from the opening (004).

10. The safety lock according to claim 1, characterized in that: The safety lock further comprises a sliding rail (400) and a sliding block (500), the sliding rail (400) is mounted on the lock body (100), the sliding block (500) is slidably matched with the sliding rail (400) in the first direction (001) and the second direction (002), and the lock block (200) is mounted on the sliding block (500).

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