A hoist anti-fall system

Abstract

The present application discloses a hoist anti-fall system, which relates to the technical field of hoisting equipment safety, and includes a top bracket fixed at the top position of the hoist, a bottom bracket fixed at the bottom position of the hoist, and a wire locking frame fixed on the hoisting member, wherein the top bracket is provided with a speed limiter, the speed limiter is rotatably provided with a speed limit wheel, the bottom bracket is rotatably provided with a transmission wheel, the speed limit wheel and the transmission wheel are jointly wound with a steel strand, the steel strands are connected end to end, the wire locking frame is provided with a fall detection unit and two sets of wire locking mechanisms, the two sets of wire locking mechanisms are respectively used to lock the steel strands on both sides of the speed limit wheel, and the fall detection unit is electrically connected to the two wire locking mechanisms. The present application cooperates with the wire locking mechanism and the fall detection unit, and when the hoisting member falls due to a mechanical failure during use of the hoist, the emergency braking of the hoisting member can be achieved, thereby improving the safety of the hoisting device.

Description

Technical Field

[0001] The present application relates to the technical field of hoisting equipment safety, and in particular to a hoist anti-fall system. Background Art

[0002] Lifting devices play an important role in equipment such as cranes, winches, tower cranes and cranes. They are responsible for applying hoisting, lifting or traction forces to the load surface to complete the lifting task. However, existing lifting devices often lack effective emergency braking devices during the lifting process. When a mechanical failure occurs, this lack may cause the risk of the hoisted object falling, seriously threatening personal and equipment safety. For example, in an elevator system, although the existing lifting device can achieve the lifting of the car and the weight balance system, it lacks effective means to prevent the car from falling when facing a mechanical failure. Therefore, there is an urgent need for an elevator anti-fall system that can provide an emergency braking function during the lifting process to solve the above technical problems. Summary of the invention

[0003] In view of the problems existing in the prior art, the present application provides a hoist anti-fall system.

[0004] The present application provides a hoist anti-fall system, which adopts the following technical solutions:

[0005] A hoist anti-fall system comprises a top bracket fixed at the top position of the hoist, a bottom bracket fixed at the bottom position of the hoist, and a wire locking frame fixed on the lifting member, wherein the top bracket is provided with a speed limiter, the speed limiter is rotatably provided with a speed limit wheel, the bottom bracket is rotatably provided with a transmission wheel, the speed limit wheel and the transmission wheel are jointly wound with steel strands, the steel strands are connected end to end, the wire locking frame is provided with a fall detection unit and two sets of wire locking mechanisms, the two sets of wire locking mechanisms are respectively used to lock the steel strands on both sides of the speed limit wheel, and the fall detection unit is electrically connected to the two wire locking mechanisms.

[0006] Optionally, the wire locking mechanism includes a first locking block, a second locking block and a hydraulic cylinder, the first locking block is fixedly set on the wire locking frame, the second locking block is slidably set on the wire locking frame in a direction close to or away from the first locking block, and the hydraulic cylinder is fixedly set on the wire locking frame and is used to drive the second locking block to slide.

[0007] Optionally, the fall detection unit includes a roller and a pressure wheel rotatably arranged on a wire locking frame, and a speed sensor for detecting the rotation speed of the roller, the steel strand is passed through the roller and the pressure wheel, and the roller and the pressure wheel are both rollingly connected to the steel strand, the speed sensor is electrically connected to a controller, and the controller is electrically connected to the hydraulic cylinders of the two wire locking mechanisms respectively.

[0008] Optionally, a shock-absorbing frame is slidably arranged on the top bracket along the vertical direction, the speed limiter is fixedly arranged on the shock-absorbing frame, a limiting assembly for preventing the shock-absorbing frame from sliding is arranged on the top bracket, a shock-absorbing part is arranged on the top bracket and below the shock-absorbing frame, a supporting platform is arranged on the top bracket and below the shock-absorbing frame, and a tightening assembly for tightening the steel strand is arranged on the bottom bracket.

[0009] Optionally, the limit assembly includes a limit block and a servo cylinder, the limit block is slidably disposed on the top bracket and is used to support and prevent the shock absorber frame from sliding, the servo cylinder is fixedly disposed on the top bracket and is used to drive the limit block to slide, the controller is electrically connected to the servo cylinder, a plurality of balls are rotatably disposed on the limit block, and the balls are used to be rollingly connected to the shock absorber frame.

[0010] Optionally, the shock absorbing component includes a shock absorbing spring, a support block is fixedly arranged on the top bracket and below the shock absorbing frame, the shock absorbing spring is arranged between the support block and the shock absorbing frame, and both ends of the shock absorbing spring are respectively connected to the support block and the shock absorbing frame.

[0011] Optionally, the tensioning assembly includes a first tensioning wheel, a tensioning frame, a second tensioning wheel and an elastic member, the first tensioning wheel is rotatably arranged on the bottom bracket, the tensioning frame is slidably arranged on the bottom bracket in a direction approaching or away from the first tensioning wheel, the second tensioning wheel is rotatably arranged on the tensioning frame, the steel wire rope passes around the first tensioning wheel and the second tensioning wheel respectively, and the elastic member is used to drive the tensioning frame to slide in a direction away from the first tensioning wheel.

[0012] Optionally, a limit frame is slidably arranged on the bottom bracket along the sliding direction of the expansion frame, a limit piece for preventing the limit frame from sliding is arranged on the bottom bracket, and the elastic piece is used to drive the expansion frame to slide in a direction away from the limit frame.

[0013] Optionally, the limiting member includes a limiting screw, which is rotatably disposed on the bottom bracket and is threadably matched with the limiting frame.

[0014] Optionally, a placement groove is opened on the bottom bracket along the sliding direction of the limit frame, a clamping block is fixedly arranged on the limit frame, and the clamping block is slidably arranged in the placement groove, a plurality of gaskets are placed in the placement groove, and the gaskets are arranged on the side of the clamping block away from the expansion frame.

[0015] In summary, the present application includes at least one of the following beneficial technical effects:

[0016] 1. During the lifting process, if a mechanical failure occurs and causes the lifting member to fall, the fall detection unit will immediately detect this abnormal situation and send signals to the two sets of locking wire mechanisms respectively. After receiving the signal, one set of locking wire mechanisms will first lock the steel strand on the corresponding side of the locking wire mechanism. At this time, the steel strand will move with the lifting member, and the speed limiter on the top bracket will first alleviate the falling speed of the lifting member. After that, the other set of locking wire mechanisms will lock the steel strand on the other side of the speed limiting wheel. At this time, since the steel strands on both sides of the speed limiting wheel are locked and fixed with the lifting member, the continued movement of the steel strand is prevented, and the lifting member will not continue to fall, and emergency braking of the lifting member is achieved, which greatly improves the safety of the lifting device; and since the lifting member is first decelerated by the speed limiter and then emergency braking is completed when falling, the impact force of the lifting member during emergency braking can be effectively alleviated and reduced, and the anti-fall system is made safer and more reliable.

[0017] 2. When the second set of wire locking mechanisms locks the steel strand and completes the emergency braking of the lifting member, the load of the lifting member will instantly act on the speed limiter. Since the lifting member is in a falling state at this time, it will be affected by inertia and will have a huge impact force on the speed limiter. The present application provides a shock absorber on the top bracket and installs the speed limiter on the shock absorber. When the second set of wire locking mechanisms locks the steel strand, the controller controls the servo cylinder to start, drives the limit block to slide and cancels the limit on the shock absorber. The shock absorber slides downward under the influence of the load of the lifting member until it abuts against the platform. During the downward sliding process of the shock absorber, the shock absorber offsets most of the impact force on the shock absorber and the speed limiter through the shock absorber, thereby avoiding damage to the speed limiter or breakage of the steel strand to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0019] Figure 2 It is a schematic diagram of the structure of the wire lock rack used in the embodiment of the present application;

[0020] Figure 3 It is a schematic diagram of the structure of the top bracket used in the embodiment of the present application;

[0021] Figure 4 yes Figure 3 A magnified view of part A;

[0022] Figure 5 It is a schematic diagram of the structure of the bottom bracket used to express the embodiment of the present application.

[0023] Explanation of the reference numerals: 1. top bracket; 11. shock absorbing frame; 12. support platform; 13. shock absorbing spring; 14. supporting block; 15. limiting block; 151. ball; 16. servo cylinder; 2. bottom bracket; 21. transmission wheel; 22. first tensioning wheel; 23. tensioning frame; 231. slider; 24. second tensioning wheel; 25. elastic member; 26. placement groove; 27. limiting frame; 271. clamping block; 28. limiting screw; 29. ​​gasket; 3. wire locking frame; 31. threading hole; 32. first locking block; 33. second locking block; 34. hydraulic cylinder; 35. roller; 36. clamping wheel; 37. speed sensor; 4. speed limiter; 41. speed limiting wheel; 5. steel strand. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-Figure 5 This application is described in further detail.

[0025] The present application embodiment discloses a hoist anti-fall system. Figure 1 , including a top bracket 1, a bottom bracket 2 and a wire locking frame 3, the top bracket 1 is fixed at the top position of the elevator, the bottom bracket 2 is fixed at the bottom position of the elevator or on the ground, the wire locking frame 3 is fixed to the lifting member to be lifted by bolts or welding, a speed limiter 4 is arranged on the top bracket 1, a speed limiter wheel 41 is rotatably arranged on the speed limiter 4, a transmission wheel 21 is rotatably arranged on the bottom bracket 2, a steel strand 5 is wound around the speed limiter wheel 41 and the transmission wheel 21, and the steel strand 5 is connected end to end.

[0026] Reference Figure 2 Two threading holes 31 are provided on the wire locking frame 3, and the steel strands 5 on both sides of the speed limiting wheel 41 are respectively inserted into the two threading holes 31. Two sets of wire locking mechanisms are also provided on the wire locking frame 3, and the two sets of wire locking mechanisms correspond to the two threading holes 31 one by one, and are used to lock the steel strands 5 in the corresponding threading holes 31. The wire locking mechanism includes a first locking block 32, a second locking block 33 and a hydraulic cylinder 34. The first locking block 32 is fixedly arranged on the wire locking frame 3, and the second locking block 33 is slidably arranged on the wire locking frame 3 along a direction approaching or away from the first locking block 32, and the first locking block 32 and the second locking block 33 are respectively located on both sides of the corresponding threading hole 31, and the hydraulic cylinder 34 is fixedly arranged on the wire locking frame 3, and the piston rod of the hydraulic cylinder 34 is fixedly connected to the corresponding second locking block 33.

[0027] Reference Figure 2A fall detection unit is provided on the wire locking frame 3, and the fall detection unit includes a roller 35 and a clamping wheel 36 rotatably arranged on the wire locking frame 3, and a speed sensor 37 for detecting the rotation speed of the roller 35, the rotation axes of the roller 35 and the clamping wheel 36 are parallel, and the steel strand 5 is passed through the roller 35 and the clamping wheel 36, the roller 35 and the clamping wheel 36 are both rollingly connected to the steel strand 5, and the speed sensor 37 is electrically connected to the controller, and the controller is electrically connected to the hydraulic cylinders 34 of the two wire locking mechanisms respectively.

[0028] Reference Figure 3 A shock-absorbing frame 11 is slidably arranged on the top bracket 1 along the vertical direction, the speed limiter 4 is fixedly arranged on the shock-absorbing frame 11, a support platform 12 is arranged on the top bracket 1 and below the shock-absorbing frame 11, a shock-absorbing member is arranged on the top bracket 1 and below the shock-absorbing frame 11, and the shock-absorbing member includes a shock-absorbing spring 13, and a supporting block 14 is also fixedly arranged on the top bracket 1 and below the shock-absorbing frame 11, the shock-absorbing spring 13 is arranged between the supporting block 14 and the shock-absorbing frame 11, and the two ends of the shock-absorbing spring 13 are respectively connected to the supporting block 14 and the shock-absorbing frame 11.

[0029] Reference Figure 3 and Figure 4 The top bracket 1 is provided with a limit assembly for preventing the damping frame 11 from sliding. The limit assembly includes a limit block 15 and a servo cylinder 16. The limit block 15 is slidably arranged on the top bracket 1 in the horizontal direction, and a plurality of balls 151 are rotatably arranged on the top of the limit block 15. The servo cylinder 16 is fixedly arranged on the top bracket 1, and the piston rod of the servo cylinder 16 is fixedly connected to the limit block 15. The controller is electrically connected to the servo cylinder 16. The limit block 15 is driven by the servo cylinder 16 to slide to the bottom of the damping frame 11, and the damping frame 11 is adjusted. The second set of wire locking mechanisms locks the steel strand 5, and the servo cylinder 16 is started by the controller to drive the limit block 15 to slide and cancel the limit on the shock-absorbing frame 11. The shock-absorbing frame 11 slides downward under the load of the lifting member until it abuts against the support platform 12. During the downward movement of the shock-absorbing frame 11, the shock-absorbing spring 13 offsets most of the impact force on the shock-absorbing frame 11 and the speed limiter 4, thereby avoiding damage to the speed limiter 4 or breakage of the steel strand 5 to a certain extent.

[0030] Reference Figure 5A tensioning assembly for tightening the steel strand 5 is arranged on the bottom bracket 2, and the tensioning assembly includes a first tensioning wheel 22, a tensioning frame 23, a second tensioning wheel 24 and an elastic member 25. The first tensioning wheel 22 is rotatably arranged on the bottom bracket 2, and a placement groove 26 is opened on the bottom bracket 2. A slider 231 is fixedly arranged on the tensioning frame 23, and the slider 231 is slidably arranged in the placement groove 26, and the tensioning frame 23 slides in a direction close to or away from the first tensioning wheel 22. The second tensioning wheel 24 is rotatably arranged on the tensioning frame 23. The first tensioning wheel 22 and the second tensioning wheel 24 are both parallel to the rotation axis of the transmission wheel 21, and the steel strand 5 passes around the first tensioning wheel 22 and the second tensioning wheel 24 respectively.

[0031] Reference Figure 5 A limiting frame 27 is slidably provided on the bottom bracket 2, a clamping block 271 is fixedly provided on the limiting frame 27, the clamping block 271 is slidably provided in the placement groove 26, the elastic member 25 includes a compression spring, the compression spring is provided in the placement groove 26 and is located between the slider 231 and the clamping block 271, and the two ends of the compression spring are respectively connected to the slider 231 and the clamping block 271.

[0032] Reference Figure 5 A limiting member for preventing the limiting frame 27 from sliding is provided on the bottom bracket 2, and the limiting member includes a limiting screw 28, which is rotatably provided on the bottom bracket 2, and the axial direction of the limiting screw 28 is parallel to the sliding direction of the limiting frame 27, and the limiting screw 28 is threadedly matched with the limiting frame 27; a plurality of gaskets 29 are placed in the placement groove 26 and on the side of the clamping block 271 away from the expansion frame 23, and a placement opening connected to the placement groove 26 is provided on the bottom bracket 2, and the placement opening is used to place the gasket 29.

[0033] The implementation principle of the anti-falling system of a hoist in the embodiment of the present application is as follows: when the hoist is working, as the hoisting member rises and falls, the roller 35 is connected with the steel strand 5 in a rolling manner, and the speed sensor 37 monitors the speed of the roller 35 in real time. If a mechanical failure occurs and causes the hoisting member to fall, the speed sensor 37 detects that the speed of the roller 35 exceeds the preset value. At this time, the hydraulic cylinder 34 of one group of locking wire mechanisms is controlled by the controller to act, so that the first locking block 32 and the second locking block 33 of the locking wire mechanism lock the steel strand 5 at the corresponding threading hole 31. At this time, the steel strand 5 will act together with the hoisting member, and the speed limiter 4 will first alleviate the falling speed of the hoisting member. After that, the hydraulic cylinder 34 of another group of locking wire mechanisms is controlled by the controller to act, and the steel strand 5 on the other side of the speed limiting wheel 41 is locked. At this time, since the steel strands 5 on both sides of the speed limiting wheel 41 are locked and fixed with the hoisting member, the steel strand 5 is prevented from continuing to move, and the hoisting member will not continue to fall, thereby realizing emergency braking of the hoisting member, greatly improving the safety of the lifting device.

[0034] Furthermore, since the lifting member is first decelerated by the speed limiter 4 and then emergency braking is performed when falling, the impact force of the lifting member during emergency braking can be effectively alleviated and reduced, and the anti-fall system is made safer and more reliable.

[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hoist anti-fall system, characterized in that: The invention comprises a top bracket (1) fixed at the top position of the hoist, a bottom bracket (2) fixed at the bottom position of the hoist, and a wire locking frame (3) fixed on the lifting member, wherein a speed limiter (4) is arranged on the top bracket (1), a speed limiter wheel (41) is rotatably arranged on the speed limiter (4), a transmission wheel (21) is rotatably arranged on the bottom bracket (2), a steel strand (5) is wound around the speed limiter wheel (41) and the transmission wheel (21), and the steel strand (5) is connected end to end, and a fall detection unit and two sets of wire locking mechanisms are arranged on the wire locking frame (3), the two sets of wire locking mechanisms are respectively used to lock the steel strands (5) on both sides of the speed limiter wheel (41), and the fall detection unit is electrically connected to the two wire locking mechanisms; The wire locking mechanism comprises a first locking block (32), a second locking block (33) and a hydraulic cylinder (34); the first locking block (32) is fixedly arranged on the wire locking frame (3); the second locking block (33) is slidably arranged on the wire locking frame (3) in a direction approaching or moving away from the first locking block (32); and the hydraulic cylinder (34) is fixedly arranged on the wire locking frame (3) and is used to drive the second locking block (33) to slide; The fall detection unit comprises a roller (35) and a clamping wheel (36) rotatably arranged on a wire locking frame (3), and a rotation speed sensor (37) for detecting the rotation speed of the roller (35); the steel strand (5) is passed through the roller (35) and the clamping wheel (36), and the roller (35) and the clamping wheel (36) are both rollingly connected to the steel strand (5); the rotation speed sensor (37) is electrically connected to a controller, and the controller is electrically connected to the hydraulic cylinders (34) of the two wire locking mechanisms respectively.

2. The anti-falling system for a hoist according to claim 1, characterized in that: A damping frame (11) is slidably arranged on the top bracket (1) in the vertical direction, the speed limiter (4) is fixedly arranged on the damping frame (11), a limiting component for preventing the damping frame (11) from sliding is arranged on the top bracket (1), a damping piece is arranged on the top bracket (1) and below the damping frame (11), a support platform (12) is arranged on the top bracket (1) and below the damping frame (11), and a tightening component for tightening the steel strand (5) is arranged on the bottom bracket (2).

3. The anti-falling system for a hoist according to claim 2, characterized in that: The limit assembly comprises a limit block (15) and a servo cylinder (16); the limit block (15) is slidably arranged on the top bracket (1) and is used to support and prevent the shock absorber frame (11) from sliding; the servo cylinder (16) is fixedly arranged on the top bracket (1) and is used to drive the limit block (15) to slide; the controller is electrically connected to the servo cylinder (16); a plurality of balls (151) are rotatably arranged on the limit block (15), and the balls (151) are used to be rollingly connected to the shock absorber frame (11).

4. The anti-falling system for a hoist according to claim 2, characterized in that: The shock absorbing component comprises a shock absorbing spring (13); a support block (14) is fixedly arranged on the top bracket (1) and below the shock absorbing frame (11); the shock absorbing spring (13) is arranged between the support block (14) and the shock absorbing frame (11); and two ends of the shock absorbing spring (13) are respectively connected to the support block (14) and the shock absorbing frame (11).

5. The anti-falling system for a hoist according to claim 2, characterized in that: The tensioning assembly comprises a first tensioning wheel (22), a tensioning frame (23), a second tensioning wheel (24) and an elastic member (25); the first tensioning wheel (22) is rotatably arranged on the bottom bracket (2); the tensioning frame (23) is slidably arranged on the bottom bracket (2) in a direction approaching or moving away from the first tensioning wheel (22); the second tensioning wheel (24) is rotatably arranged on the tensioning frame (23); the steel strand (5) passes around the first tensioning wheel (22) and the second tensioning wheel (24) respectively; and the elastic member (25) is used to drive the tensioning frame (23) to slide in a direction away from the first tensioning wheel (22).

6. The hoist anti-falling system according to claim 5, characterized in that: A limit frame (27) is slidably arranged on the bottom bracket (2) along the sliding direction of the expansion frame (23); a limit piece for preventing the limit frame (27) from sliding is arranged on the bottom bracket (2); and the elastic piece (25) is used to drive the expansion frame (23) to slide in a direction away from the limit frame (27).

7. The anti-falling system for a hoist according to claim 6, characterized in that: The limiting member comprises a limiting screw (28), the limiting screw (28) is rotatably arranged on the bottom bracket (2), and the limiting screw (28) is threadably matched with the limiting frame (27).

8. The anti-falling system for a hoist according to claim 7, characterized in that: A placement groove (26) is provided on the bottom bracket (2) along the sliding direction of the limiting frame (27); a clamping block (271) is fixedly provided on the limiting frame (27), and the clamping block (271) is slidably provided in the placement groove (26); a plurality of gaskets (29) are provided in the placement groove (26), and the gaskets (29) are provided on a side of the clamping block (271) away from the expansion frame (23).

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