Inclined pulling and inclined lifting prevention device for lifting equipment

Abstract

The invention belongs to the technical field of hoisting equipment, and particularly relates to a hoisting equipment inclined pulling and inclined hoisting prevention device which comprises a mounting base, a correlation type photoelectric switch is fixedly mounted at the top of a positioning ring plate, an adjusting screw rod is rotationally connected to the top of the positioning ring plate, a limiting piece is arranged at the top of the positioning ring plate, and a planetary gear piece is arranged in the positioning ring plate. According to the cable-stayed and inclined lifting prevention device of the lifting equipment, the steel wire rope penetrates and bypasses the round hole groove of the guide plate and the sliding groove in the inner side of the fixed pulley, so that the shaking amplitude of the upper end of the steel wire rope can be reduced, and same-frequency shaking of a lifting hook ring connected with the lower end of the steel wire rope and a heavy object is prevented; at the moment, a laser path between the correlation type photoelectric switches is recovered, the lifting control system starts a motor controller through a single chip microcomputer module, a second gear motor works, an adjusting screw rod rotates, and a limiting plate gets close to a steel wire rope and is pushed to the center position to prevent deflection.

Description

Technical Field

[0001] The invention belongs to the technical field of lifting equipment, and in particular relates to a device for preventing oblique pulling and crooked lifting of lifting equipment. Background Art

[0002] Cranes are indispensable lifting and hoisting machinery for transporting materials or equipment in modern industrial production. Cranes can be divided into tire cranes and bridge cranes. Tire cranes have a walking structure and are mainly used in outdoor working environments, while bridge cranes are mainly horizontally mounted above workshops, warehouses and material yards to lift materials. The anti-oblique lifting device, as the name suggests, refers to a device that maintains the center of gravity of the heavy object during the lifting process and keeps the lifting rope driving the heavy object to rise in a straight line, thereby preventing the crane rope guide and wire rope from being scrapped due to oblique lifting, and even safety accidents.

[0003] After searching, it was found that according to the invention patent with Chinese patent publication number CN117533944A, a crane anti-oblique pull protector is disclosed. The crane anti-oblique pull protector is to start the second motor to drive the screw rod to rotate, and the rotation of the screw rod drives the slide seat to move in the slide groove of the moving seat. The movement of the limiting ring can guide the rope so that the rope can be evenly wound onto the winding drum, thereby improving the practicality of the device. However, the winding drum in the device is arranged directly above the limiting ring, that is, the rope distance between the winding drum and the limiting ring is too short. When the motor drives the screw rod to drive the limiting ring When the rope is moved left and right to be evenly wound around the winding drum, the heavy object hoisted at the bottom of the rope may swing due to the rope, which is dangerous. At the same time, the guide roller structure in the limiting ring cannot adjust the spacing according to the thickness of the rope, that is, the guide roller cannot be adjusted to fit the outside of the lifting rope. When the rope is lifted, reeled or lowered for lifting, there will still be a certain degree of shaking. Therefore, the crane anti-slanting protector needs to be further improved in the guide structure of the rope when it is lifted, reeled and lowered for lifting. Therefore, a lifting equipment anti-slanting and crooked lifting device is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide a device for preventing oblique pulling and crooked lifting of lifting equipment.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a device for preventing tilting and crooked lifting of lifting equipment, comprising a mounting base, a lifting assembly and a bracket are arranged on the top of the mounting base, and a lifting auxiliary mechanism is arranged on the side of the mounting base;

[0006] The lifting assembly is provided with a winch motor fixed to the top of the mounting base;

[0007] The inner side of the top of the bracket is rotatably connected with a reel and a fixed pulley, and a winding auxiliary part is provided on the top of the bracket;

[0008] The lifting auxiliary structure is provided with a positioning ring plate fixed to the side of the mounting base, a beam-type photoelectric switch is fixedly installed on the top of the positioning ring plate, an adjusting screw is rotatably connected to the top of the positioning ring plate, a limit piece is provided on the top of the positioning ring plate, and a planetary gear piece is provided inside the positioning ring plate.

[0009] Specifically, the bracket is rotatably connected to the first sprocket, the output end of the winch motor and the front end of the winding drum are respectively fixedly connected to the first sprocket, a wire rope is wound on the outer side of the winding drum, a sliding groove matching the wire rope is opened on the inner side of the fixed pulley, the wire rope is slidably connected to the inner side of the sliding groove, the winch motor drives the first sprocket, the winding drum rotates to wind and release the wire rope, and the wire rope slides along the guide plate and the inner side of the fixed pulley.

[0010] Specifically, the winding auxiliary part is provided with a column frame fixed to the top of the bracket and having a U-shaped structure. The inner side of the column frame is rotatably connected to a threaded screw, the outer side of the threaded screw is threadedly connected to a sleeve block, and the opposite side of the sleeve block is fixedly connected to a guide plate. A circular hole groove is opened inside the guide plate, and the steel wire rope is slidably connected to the inner side of the circular hole groove. The sleeve block is threadedly connected to the threaded screw, and the sleeve block is driven by the threaded screw to enable the guide plate to move forward and backward.

[0011] Specifically, the column frame is rotatably connected to the second sprocket, the second sprocket is fixedly connected to the threaded screw, a first reduction motor is fixedly installed on the front top of the column frame, the output end of the first reduction motor is fixedly connected to the front end of the second sprocket, the first reduction motor drives the second sprocket to rotate, thereby driving the threaded screw to rotate synchronously in the same direction.

[0012] Specifically, a cylindrical through groove is opened on the inner side of the positioning ring plate, and the opposing photoelectric switch is symmetrically arranged around the center of the through groove. A laser transmitter and a receiver are arranged on opposite sides of the opposing photoelectric switch, and the receiver is connected to the lifting control system through a photoelectric detection circuit.

[0013] Specifically, the steel wire rope passes through the through slot and is fixedly connected to the hook ring below, driving the hook ring to move up and down to lift the heavy objects of the equipment, and the steel wire rope cuts off the laser path of the opposing photoelectric switch.

[0014] Specifically, the limiting member is provided with a limiting plate connected to the external thread of the adjusting screw, a bearing block is fixedly installed on one side of the limiting plate close to the through slot, and a miniature roller is rotatably connected to the inner side of the bearing block.

[0015] Specifically, the inner top wall and the inner bottom wall of the positioning ring plate are both provided with annular grooves, the planetary gear member is slidably connected to the gear ring ring inside the annular groove, the inner tooth layer of the gear ring ring is meshed with an inner gear disk, and a second reduction motor is fixedly installed on the bottom of the positioning ring plate, and the output end of the second reduction motor is fixedly connected to the bottom of the inner gear disk.

[0016] Specifically, the outer tooth layer of the gear ring is meshed with an outer gear disk, the outer gear disks are evenly distributed in a circular array, and the top box and bottom of the outer gear disk are rotatably connected to the inner top wall and inner bottom wall of the positioning ring plate respectively, the outer gear disk and the inner gear disk both rotate inside the positioning ring plate, and the gear ring rotates on the inner side of the ring groove.

[0017] Specifically, the top of the outer gear disc is fixedly connected to a No. 1 bevel gear, one end of the adjusting screw is fixedly connected to a No. 2 bevel gear, the top of the No. 1 bevel gear is respectively meshed with the outer side of the No. 2 bevel gear, the outer gear disc drives the No. 1 bevel gear, the No. 1 bevel gear meshes with the No. 2 bevel gear to make the adjusting screw rotate synchronously, so that the limit plate moves toward the outside of the wire rope to fit.

[0018] The present invention has the following beneficial effects:

[0019] 1) The device for preventing the lifting equipment from tilting and tilting is implemented by winding and fixing one end of the wire rope around the outside of the winding drum, and using the winch motor to drive the first sprocket to rotate the winding drum, so as to realize the winding and lowering of the wire rope. At this time, the wire rope passes through the circular hole groove of the guide plate and the slide groove on the inner side of the fixed pulley respectively, and extends to the bottom of the positioning ring plate. When the threaded screw drives the guide plate to move back and forth, the wire rope is evenly wound around the outside of the winding drum. The circular hole groove and the slide groove structure can reduce the shaking amplitude of the upper end of the wire rope, prevent the hook ring connected to the lower end of the wire rope and the heavy object from shaking at the same frequency, and improve the safety of heavy object lifting.

[0020] 2) The device for preventing the lifting equipment from tilting and crooked lifting has a steel wire rope passing through the through groove of the positioning ring plate and connected to the hook ring. In a natural state, the steel wire rope will naturally fall down and cut off the laser path between the two symmetrically distributed opposing photoelectric switches. When the steel wire rope begins to reel in, the guide plate moving at the upper end and the heavy object hoisted at the lower end will cause the steel wire rope to tilt and lift during the rising process. At this time, the laser path between the opposing photoelectric switches is restored, and the detected photoelectric signal is processed and transmitted to the external lifting control system. The system controls the single-chip microcomputer module to start the motor controller, so that the second reduction motor drives the inner gear disc to rotate, and the inner gear disc drives the outer gear disc through the meshing of the gear ring, so that the adjusting screw rotates, and the limit plate moves closer to the steel wire rope, pushing the steel wire rope to the center position until the laser path between the opposing photoelectric switches is cut off again, thereby effectively preventing the steel wire rope from tilting during the lifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 Schematic diagram of the installation base structure.

[0023] Figure 3 It is a schematic diagram of the partial structure of the positioning ring plate.

[0024] Figure 4 This is a top view of the positioning ring plate.

[0025] Figure 5 for Figure 4 Schematic diagram of some structures.

[0026] Figure 6 for Figure 4 sectional view of .

[0027] In the figure: 1-mounting base; 2-lifting assembly; 201-winch motor; 202-bracket; 203-winding drum; 204-fixed pulley; 205-winding auxiliary part; 2051-column frame; 2052-threaded screw; 2053-guide plate; 3-lifting auxiliary mechanism; 301-positioning ring plate; 302-opposing photoelectric switch; 303-adjusting screw; 304-limiting part; 3041-limiting plate; 3042-bearing block; 3043-mini roller; 305-planetary gear part; 3051-tooth ring; 3052-inner gear disc; 3053-outer gear disc; 4-first sprocket; 5-wire rope; 6-second sprocket; 7-first reduction motor; 8-hook ring; 9-second reduction motor. DETAILED DESCRIPTION

[0028] The present invention will now be described in further detail with reference to the accompanying drawings.

[0029] As shown Figure 1-6 A device for preventing tilting and crooked lifting of lifting equipment comprises a mounting base 1, a lifting assembly 2 is arranged on the top of the mounting base 1, and a lifting auxiliary mechanism 3 is arranged on the right side of the mounting base 1;

[0030] The lifting assembly 2 includes a hoisting motor 201 fixed to the left side of the top of the mounting base 1, a bracket 202 is fixedly installed on the top of the mounting base 1, a reel 203 is rotatably connected to the inner side of the top of the bracket 202, a fixed pulley 204 is rotatably connected to the inner side of the top of the bracket 202, and a winding auxiliary member 205 is provided on the top of the bracket 202;

[0031] The lifting auxiliary mechanism 3 includes a positioning ring plate 301 fixed to the right side of the mounting base 1, a beam-type photoelectric switch 302 is fixedly mounted on the top of the positioning ring plate 301, an adjusting screw 303 is rotatably connected to the top of the positioning ring plate 301, a limiting member 304 is arranged on the top of the positioning ring plate 301, and a planetary gear member 305 is arranged inside the positioning ring plate 301.

[0032] The front side of the bracket 202 is rotatably connected to two first sprockets 4, the output end of the hoisting motor 201 and the front end of the winding drum 203 are fixedly connected to the rear ends of the two first sprockets 4 respectively, a steel wire rope 5 is wound on the outer side of the winding drum 203, a slide groove adapted to the steel wire rope 5 is opened on the inner side of the fixed pulley 204, and the steel wire rope 5 is slidably connected to the inner side of the slide groove.

[0033] The mounting base 1 is installed through four bolt rod structures, and the winch motor 201 drives one of the first sprockets 4. The two first sprockets 4 are synchronously driven through the chain belt. At this time, the winding drum 203 rotates to wind and release the wire rope 5, and the wire rope 5 can slide along the guide plate 2053 and the inner side of the fixed pulley 204.

[0034] The winding auxiliary component 205 includes a column frame 2051 which is fixed to the top of the bracket 202 and has a U-shaped structure. The inner side of the column frame 2051 is rotatably connected to two threaded screws 2052. The outer sides of the two threaded screws 2052 are threadedly connected to sleeve blocks. The opposite sides of the two sleeve blocks are fixedly connected to a guide plate 2053. A circular hole groove is opened inside the guide plate 2053, and the wire rope 5 is slidably connected to the inner side of the circular hole groove.

[0035] The top and bottom of the guide plate 2053 are both fixed with sleeve blocks, and the two sleeve blocks are respectively threadedly connected to the two threaded screw rods 2052. The threaded screw rods 2052 drive the sleeve blocks to enable the guide plate 2053 to move forward and backward.

[0036] The inner front wall of the column frame 2051 is rotatably connected to two second sprockets 6, the front ends of the two threaded screws 2052 are fixedly connected to the rear ends of the two second sprockets 6 respectively, and a first reduction motor 7 is fixedly installed on the front top of the column frame 2051, and the output end of the first reduction motor 7 is fixedly connected to the front end of one of the second sprockets 6.

[0037] The first reduction motor 7 drives one of the second sprockets 6, and the two second sprockets 6 rotate synchronously through the chain belt. At this time, the two second sprockets 6 drive the two threaded screws 2052 to rotate synchronously in the same direction.

[0038] A through groove with a cylindrical structure is opened on the inner side of the positioning ring plate 301. There are two opposing photoelectric switches 302. The two opposing photoelectric switches 302 are symmetrically arranged around the center of the through groove, and laser transmitters and receivers are arranged on opposite sides of the two opposing photoelectric switches 302. The two receivers are connected to an external lifting control system through a photoelectric detection circuit. The lifting control system includes a single-chip microcomputer module and a motor controller. The wire rope 5 passes through the through groove at the end away from the winding drum 203 and is fixedly connected to a hook ring 8. The positioning ring plate 301 is located directly below the fixed pulley 204.

[0039] The steel wire rope 5 naturally hangs down and passes through the through groove, and is fixedly connected to the hook ring 8 below. The steel wire rope 5 is wound and released by rotating the winding drum 203, driving the hook ring 8 to move up and down to lift the heavy objects of the equipment. At this time, the vertical steel wire rope 5 will cut off the laser path of the two opposing photoelectric switches 302. The two opposing photoelectric switches 302 are essentially photoelectric sensor structures. The detection laser signal is emitted by the laser transmitter. After the receiver of the avalanche photodiode structure receives the laser signal, the signal is transmitted to the lifting control system through the photoelectric detection circuit.

[0040] The limiting member 304 includes a limiting plate 3041 connected to the external thread of the adjusting screw 303, a bearing block 3042 is fixedly installed on the side of the limiting plate 3041 close to the through groove, and a miniature roller 3043 is rotatably connected to the inner side of the bearing block 3042. There are four adjusting screws 303, and the four adjusting screws 303 are evenly distributed in a circular array.

[0041] When the steel wire rope 5 is lifted downward, the miniature roller 3043 is used to roll on the outer side of the steel wire rope 5 to reduce the resistance of the steel wire rope 5 and to guide and limit the steel wire rope 5 to prevent it from deviating or tilting.

[0042] The inner top wall and the inner bottom wall of the positioning ring plate 301 are both provided with annular grooves, and the planetary gear part 305 includes a gear ring 3051 slidably connected to the inner sides of the two annular grooves, and the inner tooth layer of the gear ring 3051 is meshed with an inner gear disk 3052. A second reduction motor 9 is fixedly installed at the bottom of the positioning ring plate 301, and the output end of the second reduction motor 9 is fixedly connected to the bottom of the inner gear disk 3052. The single-chip microcomputer module and the motor controller are electrically connected to the second reduction motor 9 through the control circuit.

[0043] The lifting control system controls the motor controller through the single chip microcomputer module to operate the second reduction motor 9, and the second reduction motor 9 drives the inner gear disc 3052, the inner gear disc 3052 engages to drive the gear ring 3051, and the gear ring 3051 engages to drive the outer gear disc 3053.

[0044] The top of the inner toothed disc 3052 is rotatably connected to the inner top wall of the positioning ring plate 301, and the outer tooth layer of the toothed ring 3051 is meshed with four outer toothed discs 3053. The four outer toothed discs 3053 are evenly distributed in a circular array, and the top and bottom of the four outer toothed discs 3053 are rotatably connected to the inner top wall and inner bottom wall of the positioning ring plate 301 respectively.

[0045] The outer toothed disc 3053 and the inner toothed disc 3052 both rotate inside the positioning ring plate 301 , and the toothed ring 3051 rotates inside the ring groove.

[0046] The tops of the four outer gear discs 3053 are fixedly connected to a No. 1 bevel gear, one end of the four adjusting screws 303 is fixedly connected to a No. 2 bevel gear, and the tops of the four No. 1 bevel gears are respectively meshed with the outer sides of the four No. 2 bevel gears.

[0047] The four outer gear discs 3053 drive four No. 1 bevel gears, and the four No. 1 bevel gears mesh with the four No. 2 bevel gears to make the four adjusting screws 303 rotate synchronously, so that the four limit plates 3041 move to fit outside the wire rope 5, and adjust according to the thickness of the wire rope 5.

[0048] The working method of the anti-slanting and crooked lifting device of the lifting equipment is as follows: one end of the wire rope 5 is wound and fixed on the outer side of the winding drum 203, and the winch motor 201 is used to drive the first sprocket 4 to rotate the winding drum 203 to realize the winding and lowering of the wire rope 5. At this time, the wire rope 5 passes through the circular hole groove of the guide plate 2053 and the slide groove inside the fixed pulley 204 respectively, and extends to the bottom of the positioning ring plate 301. When the threaded screw rod 2052 drives the guide plate 2053 to move back and forth, the wire rope 5 is evenly wound around the outer side of the winding drum 203. The circular hole groove and the slide groove structure can reduce the shaking amplitude of the upper end of the wire rope 5, prevent the hook ring 8 connected to the lower end of the wire rope 5 and the heavy object from shaking at the same frequency, thereby improving the safety of heavy objects during lifting. The wire rope 5 passes through the through groove of the positioning ring plate 301 and is connected to the hook ring 8. In a natural state, the wire rope 5 will naturally hang down. The laser path between the two symmetrically distributed opposing photoelectric switches 302 is cut off. When the wire rope 5 starts to be wound, the guide plate 2053 moving at the upper end and the heavy object hoisted at the lower end will cause the wire rope 5 to be tilted and lifted during the rising process. At this time, the laser path between the opposing photoelectric switches 302 is restored, and the detected photoelectric signal is processed and transmitted to the external lifting control system. The system controls the single-chip microcomputer module to start the motor controller, so that the second reduction motor 9 drives the inner gear disc 3052 to rotate. The inner gear disc 3052 drives the outer gear disc 3053 through the engagement of the gear ring 3051, so that the adjusting screw 303 rotates, and the limit plate 3041 moves closer to the wire rope 5, pushing the wire rope 5 to the center position until the laser path between the opposing photoelectric switches 302 is cut off again, thereby effectively preventing the wire rope 5 from tilting during the lifting process.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for preventing tilting and crooked lifting of lifting equipment, characterized in that: It comprises a mounting base, the top of which is provided with a lifting assembly and a bracket, and the side of the mounting base is provided with a lifting auxiliary mechanism; The lifting assembly is provided with a winch motor fixed to the top of the mounting base; The inner side of the top of the bracket is rotatably connected with a reel and a fixed pulley, and a winding auxiliary part is provided on the top of the bracket; The lifting auxiliary structure is provided with a positioning ring plate fixed to the side of the mounting base, a beam-type photoelectric switch is fixedly installed on the top of the positioning ring plate, an adjusting screw is rotatably connected to the top of the positioning ring plate, a limit piece is provided on the top of the positioning ring plate, and a planetary gear piece is provided inside the positioning ring plate.

2. The device for preventing the lifting equipment from tilting and crooked lifting according to claim 1 is characterized in that: The bracket is rotatably connected to the first sprocket, the output end of the winch motor and the front end of the winding drum are respectively fixedly connected to the first sprocket, a wire rope is wound on the outer side of the winding drum, a slide groove matching the wire rope is opened on the inner side of the fixed pulley, the wire rope is slidably connected to the inner side of the slide groove, the winch motor drives the first sprocket, the winding drum rotates to wind and release the wire rope, and the wire rope slides along the guide plate and the inner side of the fixed pulley.

3. The device for preventing tilting and crooked lifting of lifting equipment according to claim 1, characterized in that: The winding auxiliary part is provided with a column frame fixed to the top of the bracket and having a U-shaped structure. The inner side of the column frame is rotatably connected to a threaded screw, and the outer side of the threaded screw is threadedly connected to a sleeve block. The opposite side of the sleeve block is fixedly connected to a guide plate, and a circular hole groove is opened inside the guide plate. The steel wire rope is slidably connected to the inner side of the circular hole groove, and the sleeve block is threadedly connected to the threaded screw. The sleeve block is driven by the threaded screw to enable the guide plate to move forward and backward.

4. The device for preventing tilting and crooked lifting of lifting equipment according to claim 3 is characterized in that: The column frame is rotatably connected to a second sprocket, and the second sprocket is fixedly connected to the threaded screw. A first reduction motor is fixedly installed on the front top of the column frame, and the output end of the first reduction motor is fixedly connected to the front end of the second sprocket. The first reduction motor drives the second sprocket to rotate, thereby driving the threaded screw to rotate synchronously in the same direction.

5. The device for preventing the lifting equipment from tilting and crooked lifting according to claim 1, characterized in that: A cylindrical through groove is provided on the inner side of the positioning ring plate, and the opposing photoelectric switches are symmetrically arranged around the center of the through groove. A laser transmitter and a receiver are provided on opposite sides of the opposing photoelectric switches, and the receiver is externally connected to the lifting control system through a photoelectric detection circuit.

6. The device for preventing tilting and crooked lifting of lifting equipment according to claim 2, characterized in that: The steel wire rope passes through the through slot and is fixedly connected to the hook ring below, driving the hook ring to move up and down to lift the heavy objects of the equipment, and the steel wire rope cuts off the laser path of the opposing photoelectric switch.

7. The device for preventing tilting and crooked lifting of lifting equipment according to claim 1, characterized in that: The limiting member is provided with a limiting plate connected with the external thread of the adjusting screw rod, a bearing block is fixedly installed on one side of the limiting plate close to the through slot, and a miniature roller is rotatably connected to the inner side of the bearing block.

8. The device for preventing tilting and crooked lifting of lifting equipment according to claim 1, characterized in that: The inner top wall and the inner bottom wall of the positioning ring plate are both provided with annular grooves, the planetary gear member is slidably connected to the gear ring ring inside the annular groove, the inner tooth layer of the gear ring ring is meshed with an inner gear disk, and a second reduction motor is fixedly installed at the bottom of the positioning ring plate, and the output end of the second reduction motor is fixedly connected to the bottom of the inner gear disk.

9. The device for preventing tilting and crooked lifting of lifting equipment according to claim 8, characterized in that: The outer tooth layer of the gear ring is meshed with an outer gear disk, which is evenly distributed in a ring array, and the top box and bottom of the outer gear disk are rotatably connected to the inner top wall and inner bottom wall of the positioning ring plate respectively, the outer gear disk and the inner gear disk both rotate inside the positioning ring plate, and the gear ring rotates on the inner side of the ring groove.

10. A device for preventing tilting and crooked lifting of lifting equipment according to claim 9, characterized in that: The top of the outer gear disc is fixedly connected to a No. 1 bevel gear, and one end of the adjusting screw is fixedly connected to a No. 2 bevel gear. The top of the No. 1 bevel gear is respectively meshed with the outer side of the No. 2 bevel gear. The outer gear disc drives the No. 1 bevel gear, and the No. 1 bevel gear meshes with the No. 2 bevel gear to make the adjusting screw rotate synchronously, so that the limit plate moves toward the outside of the wire rope to fit.

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