A safety anti-overload structure for a winch wheel of a building crane

Abstract

The present invention relates to the technical field of hoisting safety equipment, specifically, a safety anti-overload structure for a hoisting wheel of a building crane tower, comprising a hoisting body, the hoisting body comprising a load-bearing plate, a load-bearing frame fixedly connected to the load-bearing plate, a winding roller rotatably connected to the load-bearing frame, one end of the winding roller fixedly connected to a driven gear, a driving gear meshed just above the driven gear, a lifting unit fixedly connected to the bottom of the hoisting body, a non-return unit fixedly connected to the end of the winding roller away from the driving motor, and a cleaning unit arranged below the winding roller. When the weight of the hoisted object exceeds a preset range, the motor output shaft will separate from the hoisting input shaft to prevent the motor from burning, and a non-return unit is arranged at one end of the hoisting to prevent the winding roller on the hoisting from reversing and causing danger, and to prevent the winding roller from driving the motor output shaft to reverse and burn the motor, and at the same time, the dust on the surface of the wire rope will be cleaned when winding, thereby extending the service life of the wire rope.

Description

Technical Field

[0001] The invention relates to the technical field of hoisting safety equipment, in particular to a safety anti-overload structure for a winch wheel of a building crane. Background Art

[0002] A winch is a small, light lifting device that uses a drum to wrap a wire rope or chain to lift or pull heavy objects. The winch can lift heavy objects vertically, horizontally, or at an angle.

[0003] Before the wire rope winch works, an overload protection device needs to be installed. The overload device can protect the motor from being burned after the winch is overloaded. In daily hoisting, overload generally occurs in the following two situations:

[0004] The first one is that during the initial lifting, the object is too heavy and exceeds the lifting range of the tower crane. If the construction workers make an inaccurate estimate and force the lifting, the tower crane motor will be damaged due to overload.

[0005] The second type is that after the lifting process is completed, when the tower crane drives the object to move, there may be some unfixed parts inside the object. The sliding of the parts inside the object will change the center of gravity of the object. At this time, due to the inertia, the tension of the wire rope will increase instantly, causing overload. The winding roller may temporarily reverse, and the input motor may also reverse, with a greater probability of burning the input motor. At the same time, there will be construction risks when the object falls.

[0006] In view of this, the present invention proposes a safety anti-overload structure for a winch wheel of a building crane, which solves the above-mentioned technical problems. Summary of the invention

[0007] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0008] The present invention provides a safety anti-overload structure for a winch wheel of a building crane. When the weight of the hoisted object exceeds a preset range, the motor output shaft will be separated from the winch input shaft to prevent the motor from burning. At the same time, a non-return unit is arranged at one end of the winch to prevent the winding roller on the winch from reversing and causing danger, and also to prevent the winding roller from driving the motor output shaft to reverse and burn the motor. The dust on the surface of the wire rope will be cleaned when the wire rope is wound, thereby extending the service life of the wire rope. The specific scheme is as follows:

[0009] A safety anti-overload structure for a winch wheel of a building crane tower comprises a winch body, the winch body comprises a load-bearing plate, a load-bearing frame is fixedly connected to the load-bearing plate, a winding roller is rotatably connected to the load-bearing frame, an opening No. 1 for passing a steel wire rope is arranged below the winding roller, the opening No. 1 is arranged on the load-bearing plate, one end of the winding roller passes through the load-bearing frame and is fixedly connected to the driven gear, the driving gear is meshed with the driving gear just above the driven gear, and the driving gear is driven by a driving motor.

[0010] As a preferred solution of the safety anti-overload structure for the winch wheel of the construction tower crane described in the present invention, a lifting unit is fixedly connected to the bottom of the winch body, and the lifting unit includes a support column, the upper end of the support column extends to the interior of the load-bearing plate, and the support column and the load-bearing plate are slidably connected, the lower end of the support column is fixedly connected to the mounting plate, a support spring is nested on the support column, and the upper and lower ends of the support spring are respectively fixedly connected to the load-bearing plate and the mounting plate, a mounting hole for installation is opened on the mounting plate, and a No. 2 opening for the wire rope to pass through is opened on the mounting plate.

[0011] As a preferred solution of the safety anti-overload structure for the winch wheel of the construction tower crane described in the present invention, the winding roller is fixedly connected to a non-return unit at one end away from the driving motor, and the non-return unit includes a turntable. The winding roller is fixedly connected to the turntable after extending out of the load-bearing frame, and a protective shell is arranged on the outside of the turntable to isolate the external environment. The protective shell is fixedly connected to the side wall of the load-bearing frame, and the turntable is fixedly connected to a plurality of non-return structures, which cooperate with the non-return blocks. There are multiple non-return blocks and they are all fixedly connected to the inner wall of the protective shell through an electric push rod.

[0012] As a preferred solution of the safety anti-overload structure for the building crane winch wheel described in the present invention, the non-return structure includes a curved slider, which is slidably engaged in a groove on the curved surface of the turntable, a telescopic column is fixedly connected to the bottom of the curved slider, and the telescopic column is slidably inserted in the bottom of the groove, a compression spring is nested on the telescopic column, and the upper and lower ends of the compression spring are respectively fixedly connected to the lower end surface of the curved slider and the bottom of the groove.

[0013] As a preferred solution of the safety anti-overload structure for the winch wheel of the construction tower crane described in the present invention, a cleaning unit is arranged under the winding roller, and the cleaning unit includes a rectangular frame, and bristles are fixedly connected to the inner wall of the rectangular frame, and the end of the steel wire rope passes through the rectangular frame and abuts against the bristles, and the rectangular frame is slidably connected to the inner wall of the load-bearing frame through a guide rod.

[0014] As a preferred solution of the safety anti-overload structure for the winch wheel of the construction crane described in the present invention, a hydraulic push rod is fixedly connected to one end of the rectangular frame, the hydraulic push rod is fixedly connected to the inner wall of the load-bearing frame, the hydraulic push rod and the hydraulic pipe are fixedly connected and communicated, the hydraulic pipe is fixedly connected to the side wall of the turntable through a rotating joint, the rotating joint and a plurality of conduits are fixedly connected and communicated, the plurality of conduits are arranged inside the turntable, and the ends of the plurality of conduits are fixedly connected with extrusion components.

[0015] As a preferred solution of the safety anti-overload structure for the construction crane winch wheel described in the present invention, the end of the conduit is connected to the cavity, the cavity is formed by the piston and the turntable, the piston is slidably connected in the cavity, and the piston and the telescopic column are fixedly connected.

[0016] As a preferred solution of the safety anti-overload structure for the construction tower crane winch wheel described in the present invention, brake units are arranged on both sides of the winding roller, and the brake unit includes a support rod, the lower end of the support rod is fixedly connected to the mounting plate, the upper end of the support rod is fixedly connected to an abutment plate that cooperates with the two ends of the winding roller, and the abutment plate is fixedly connected to a brake pad.

[0017] As a preferred solution of the safety anti-overload structure for the winch wheel of the construction tower crane described in the present invention, the side of the arc-surface slider close to the compression spring should be lower than the groove mouth on the arc-surface of the turntable, and the flat end of the arc-surface slider should be oriented in the same direction as the rotation direction of the turntable.

[0018] Beneficial effects of the present invention:

[0019] (1) In the present invention, support springs and support columns are used to cooperate with the support load-bearing plate and the mechanism above it. When hoisting, the weight of the object will cause pressure on the load-bearing plate. Through the compression deformation of the support spring, the load-bearing plate drives the entire hoisting mechanism to move downward, and the output end of the motor and the input end of the hoisting mechanism are separated. If the object is not overloaded, although the support spring is compressed, it will not reach the critical value, and the output end of the motor and the input end of the hoisting mechanism will still not be separated, thereby playing a role in overload protection of the motor.

[0020] (2) In the present invention, the non-return structure is used to contact the non-return block when the winding roller is winding, so that the non-return structure contracts to ensure that the turntable can rotate normally. In special circumstances, when the turntable rotates in the opposite direction, the non-return structure will engage with the non-return block to prevent the reverse rotation of the turntable from driving the winding roller and the motor output shaft to rotate in the opposite direction, thereby causing damage to the motor.

[0021] (3) In the present invention, the non-return structure is used to drive the extrusion component to extract the liquid oil in the rotary plate, so that the liquid oil repeatedly enters the hydraulic push rod. The output end of the hydraulic push rod drives the rectangular frame to slide back and forth along the guide rod, and drives the brush bristles to clean the dust on the surface of the wire rope, thereby extending the service life of the wire rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0023] Figure 1 This is a schematic diagram of the overall structure of a safety anti-overload structure for a building crane winch;

[0024] Figure 2 A second-view structural schematic diagram of a safety anti-overload structure for a building crane winch;

[0025] Figure 3 A third-view structural diagram of a safety anti-overload structure for a building crane winch;

[0026] Figure 4 A schematic diagram of a connection structure of a non-return unit and a turntable for a safety anti-overload structure of a winch wheel of a building crane;

[0027] Figure 5 A schematic diagram of the internal connection structure of a protection box of a safety anti-overload structure for a hoisting wheel of a building crane;

[0028] Figure 6 A schematic diagram of the connection structure of a non-return unit and an extrusion component of a safety anti-overload structure for a hoisting wheel of a building crane;

[0029] Figure 7 A schematic diagram of a turntable, a rotary joint and a hydraulic pipe connection structure of a safety anti-overload structure for a building crane winch;

[0030] Figure 8 It is a schematic diagram of a connection structure between a brake unit and a winding roller for a hoisting wheel of a building crane;

[0031] Fig. 9 for Figure 3 A schematic diagram of the structure enlargement in the middle;

[0032] Fig.10 for Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0033] Fig.11 for Figure 6 A magnified schematic diagram of the structure at C in the middle;

[0034] In the figure:

[0035] 1. Winch body; 11. Driving motor; 12. Driving gear; 13. Driven gear; 14. Winding roller; 15. Load-bearing frame; 16. Steel wire rope; 17. Load-bearing plate; 18. Opening No. 1;

[0036] 2. Lifting unit; 21. Support spring; 22. Mounting plate; 23. Support column; 24. Mounting hole; 25. Opening No. 2;

[0037] 3. Check unit; 31. Turntable; 32. Protective shell; 33. Check block; 34. Check structure; 341. Arc slider; 342. Compression spring; 343. Telescopic column;

[0038] 4. Cleaning unit; 41. Rectangular frame; 42. Brush; 43. Guide rod; 44. Hydraulic push rod; 45. Extrusion component; 451. Piston; 452. Cavity; 453. Conduit; 454. Rotary joint; 455. Hydraulic pipe;

[0039] 5. Braking unit; 51. Support rod; 52. Abutment disc; 53. Braking pad. DETAILED DESCRIPTION

[0040] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example

[0042] like Figure 1 and Figure 2As shown, a safety anti-overload structure for a winch wheel of a building crane tower comprises a winch body 1, the winch body 1 comprises a load-bearing plate 17, a load-bearing frame 15 is fixedly connected to the load-bearing plate 17, a winding roller 14 is rotatably connected to the load-bearing frame 15, a No. 1 opening 18 for a steel wire rope 16 to pass through is arranged below the winding roller 14, the No. 1 opening 18 is arranged on the load-bearing plate 17, one end of the winding roller 14 passes through the load-bearing frame 15 and is fixedly connected to the driven gear 13, the driving gear 12 is meshed just above the driven gear 13, and the driving gear 12 is driven by a driving motor 11. After the driving motor 11 is working, it drives the driving gear 12 to rotate, and after the driving gear 12 rotates, it drives the driven gear 13 to rotate, and the driven gear 13 rotates and drives the winding roller 14 to extend or reel the steel wire rope 16.

[0043] like Figure 1 , Figure 2 and Figure 3 As shown, a lifting unit 2 is fixedly connected to the bottom of the winch body 1, and the lifting unit 2 includes a support column 23, the upper end of the support column 23 extends to the interior of the load-bearing plate 17, and the support column 23 and the load-bearing plate 17 are slidably connected, the lower end of the support column 23 is fixedly connected to the mounting plate 22, a support spring 21 is nested on the support column 23, and the upper and lower ends of the support spring 21 are respectively fixedly connected to the load-bearing plate 17 and the mounting plate 22, the mounting plate 22 is provided with a mounting hole 24 for installation, and the mounting plate 22 is provided with a No. 2 opening 25 for the wire rope 16 to pass through. An object to be hoisted is fixed to the lower end of the wire rope 16. When the winding roller 14 rotates to wind up the wire rope 16 to hoist the object, the wire rope 16 is subjected to the pulling force of the object, so that the load-bearing frame 15 and the load-bearing plate 17 are subjected to downward pulling force. The load-bearing plate 17 moves downward to compress the support spring 21. If the weight of the object is overloaded, the load-bearing plate 17, the load-bearing frame 15 and the winding roller 14 move downward synchronously. The distance exceeds the critical value. At this time, the driven gear 13 and the driving gear 12 are no longer meshed. At this time, the driving motor 11 drives the driving gear 12 to idle. At this time, the driving motor 11 is not subjected to the huge torque brought by the winding roller 14, which plays a role in overload protection of the motor.

[0044] like Figure 4 , Figure 5 , Figure 6 , Figure 7 , Fig.10 and Fig.11As shown, the end of the winding roller 14 away from the driving motor 11 is fixedly connected to the non-return unit 3, and the non-return unit 3 includes a turntable 31. The winding roller 14 is extended out of the load-bearing frame 15 and is fixedly connected to the turntable 31. A protective shell 32 is provided outside the turntable 31 to isolate the external environment. The protective shell 32 is fixedly connected to the side wall of the load-bearing frame 15. The turntable 31 is fixedly connected to a plurality of non-return structures 34. The non-return structures 34 cooperate with the non-return blocks 33. The non-return blocks 33 have a plurality of And they are all fixedly connected to the inner wall of the protective shell 32 through an electric push rod. The non-return structure 34 includes an arc-surface slider 341, which is slidably embedded in the groove on the arc surface of the turntable 31. The bottom of the arc-surface slider 341 is fixedly connected with a telescopic column 343, which is slidably inserted in the bottom of the groove. A compression spring 342 is embedded on the telescopic column 343, and the upper and lower ends of the compression spring 342 are respectively fixedly connected to the lower end surface of the arc-surface slider 341 and the bottom of the groove. When hoisting an object, the winding roller 14 is wound counterclockwise, and the turntable 31 rotates counterclockwise, and the turntable 31 drives the non-return structure 34 to rotate. The arc-surface slider 341 in the non-return structure 34 will slide and abut against the non-return block 33 when rotating. When the two are in contact, the arc-surface slider 341 is pressed and squeezes the compression spring 342 and then slides into the turntable 31, so that the turntable 31 can rotate normally. When hoisting objects, some objects have moving objects inside, which makes the center of gravity of the objects unstable. Therefore, when hoisting, when the objects inside the objects slide, the pulling force of the objects on the wire rope 16 will increase instantly, and the winding roller 14 and the turntable 31 are forced to reverse, and the driving shaft of the driving motor 11 is driven to reverse. When the turntable 31 reverses, it can be stopped by the curved slider 341, so that the winding roller 14 and the turntable 31 stop rotating in the opposite direction, and the driving shaft of the driving motor 11 stops reversing at the same time, which plays a role in protecting the driving motor 11 when the hoisting is overloaded, and also prevents the objects from sliding down and causing danger. When it is necessary to put the hoisted object back to the ground, the electric push rod drives the check block 33 away from the turntable 31, and no longer hinders the rotation of the turntable 31. At this time, the driving motor 11 drives the winding roller 14 to release the wire rope 16, and the turntable 31 rotates in the opposite direction.

[0045] It should be noted that the side of the arc-surface slider 341 close to the compression spring 342 should be lower than the groove mouth on the arc surface of the turntable 31 , and the flat end of the arc-surface slider 341 should be oriented in the same direction as the rotation direction of the turntable 31 .

[0046] like Figure 1 , Figure 3 , Figure 6 , Figure 7 , Fig.10 and Fig.11As shown, a cleaning unit 4 is provided below the winding roller 14, and the cleaning unit 4 includes a rectangular frame 41, and the inner wall of the rectangular frame 41 is fixedly connected with bristles 42, and the end of the wire rope 16 passes through the rectangular frame 41 and abuts against the bristles 42, and the rectangular frame 41 is slidably connected to the inner wall of the load-bearing frame 15 through a guide rod 43, and one end of the rectangular frame 41 is fixedly connected with a hydraulic push rod 44, and the hydraulic push rod 44 is fixedly connected to the inner wall of the load-bearing frame 15, and the hydraulic push rod 44 and the hydraulic pipe 455 are fixedly connected and communicated, and the hydraulic The pressure tube 455 is fixedly connected to the side wall of the turntable 31 through a rotating joint 454. The rotating joint 454 is fixedly connected and communicated with multiple conduits 453. The multiple conduits 453 are arranged inside the turntable 31. The ends of the multiple conduits 453 are fixedly connected with an extrusion component 45. The ends of the conduits 453 are communicated with a cavity 452. The cavity 452 is formed by a piston 451 and the turntable 31. The piston 451 is slidably connected in the cavity 452. The piston 451 is fixedly connected to the telescopic column 343. When the non-return structure 34 is lifted up and down, it drives the piston 451 to slide up and down in the cavity 452. When the piston 451 is active, it repeatedly draws and presses the liquid oil in the guide tube 453. After passing through the rotary joint 454 (rotating and sealed, belonging to the prior art), the liquid oil in the guide tube 453 is repeatedly drawn and pressed into the hydraulic pipe 455 and then transported to the hydraulic push rod 44. The hydraulic push rod 44 is driven by the liquid oil to drive the rectangular frame 41 to slide back and forth along the guide rod 43. The bristles 42 on the inside of the rectangular frame 41 will clean the dust on the surface of the wire rope 16. In the working environment, dust will cause the crane wire rope 16 to wear faster and shorten the service life of the wire rope 16. The wire rope 16 may break if it is severely worn. At the same time, the wire rope 16 needs to be regularly brushed with lubricating oil for maintenance. If it is contaminated with a lot of dust, the effect of the lubricating oil will be reduced.

[0047] like Figure 1 , Figure 5 , Figure 7 and Figure 8 As shown, brake units 5 are provided on both sides of the winding roller 14, and the brake units 5 include support rods 51, the lower ends of the support rods 51 are fixedly connected to the mounting plate 22, and the upper ends of the support rods 51 are fixedly connected to abutment plates 52 that match the two ends of the winding roller 14, and brake pads 53 are fixedly connected to the abutment plates 52. When the winding roller 14 is subjected to a large instantaneous pulling force during the process of lifting the object, the load-bearing plate 17 drives the load-bearing frame 15 and the winding roller 14 to descend, at which time the abutment plates 52 abut against both sides of the winding roller 14, and the brake pads 53 brake the rotating winding roller 14, and this function can assist the non-return unit 3 in working.

[0048] The workflow is as follows:

[0049] After the driving motor 11 works, it drives the driving gear 12 to rotate. After the driving gear 12 rotates, it drives the driven gear 13 to rotate. The driven gear 13 rotates and drives the winding roller 14 to extend or reel the wire rope 16. When the winding roller 14 rotates to reel the wire rope 16 to hoist the object, the wire rope 16 is subjected to the pulling force of the object, so that the load-bearing frame 15 and the load-bearing plate 17 receive downward pulling force, and the load-bearing plate 17 moves downward to compress the supporting spring 21. If the weight of the object is overloaded (according to the elastic coefficient of the supporting spring 21, it can be manually selected), the load-bearing plate 17, the load-bearing frame 15 and the winding roller 14 move downward synchronously. The distance exceeds the critical value, at this time, the driven gear 13 and the driving gear 12 are no longer meshed, and the driving motor 11 drives the driving gear 12 to idle. At this time, the driving motor 11 is not subject to the huge torque brought by the winding roller 14, which plays a role in overload protection of the motor. If the weight of the object is not overloaded, the driven gear 13 and the driving gear 12 will remain in meshing state, and can be hoisted normally. When hoisting an object, the curved slider 341 in the non-return structure 34 will slide against the non-return block 33 when rotating. When the two are in contact, the curved slider 341 is pressed and squeezes the compression spring 342 and then slides into the turntable 31, so that the turntable 31 can rotate normally. When hoisting and moving, due to inertia, some objects have moving objects inside (for example, objects inside the container are not fixed, and when hoisting and moving, the objects will slide inside the container), resulting in unstable center of gravity of the objects, and the pulling force of the objects on the wire rope 16 will increase instantly, and the winding roller 14 and the turntable 31 are forced to reverse, and the drive shaft of the drive motor 11 is driven to reverse, while the turntable 31 can be stopped by the curved slider 341 when reversing, so that the winding roller 14 and the turntable 31 stop rotating in the opposite direction, and the drive shaft of the drive motor 11 stops reversing at the same time, which plays a role in protecting the drive motor 11 when hoisting is overloaded, and also prevents the danger caused by the object sliding down. The check structure 34 drives the extrusion component 45 to work when working, and the liquid oil is finally transported to the hydraulic push rod 44 after passing through the rotary joint 454. The hydraulic push rod 44 drives the rectangular frame 41 to slide back and forth along the direction of the guide rod 43, so that the bristles 42 clean the dust on the surface of the wire rope 16. The dust will cause the crane wire rope 16 to wear faster and shorten the service life of the wire rope 16. At the same time, the wire rope 16 needs to be regularly brushed with lubricating oil for maintenance. If it is contaminated with more dust, the lubricating oil on the wire rope 16 will dry faster, causing greater wear.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A safety anti-overload structure for a winch wheel of a building crane, comprising a winch body (1), characterized in that: include: A load-bearing plate (17), to which a load-bearing frame (15) is fixedly connected; A winding roller (14), the bearing frame (15) being rotatably connected to the winding roller (14), a first opening (18) for the steel wire rope (16) to pass through being provided below the winding roller (14), the first opening (18) being provided on the bearing plate (17); A driven gear (13), one end of the winding roller (14) passes through the load-bearing frame (15) and is fixedly connected to the driven gear (13); A driving gear (12), the driving gear (12) being meshed with the driven gear (13) directly above the driven gear (13), and the driving gear (12) being driven by a driving motor (11); The end of the winding roller (14) away from the driving motor (11) is fixedly connected to a non-return unit (3), the non-return unit (3) comprising a turntable (31), the winding roller (14) is fixedly connected to the turntable (31) after extending out of the load-bearing frame (15), a protective shell (32) is arranged outside the turntable (31) to isolate the external environment, the protective shell (32) is fixedly connected to the side wall of the load-bearing frame (15), the turntable (31) is fixedly connected to a plurality of non-return structures (34), the non-return structures (34) cooperate with the non-return blocks (33), and the non-return blocks (33) are multiple and are fixedly connected to the inner wall of the protective shell (32) through electric push rods; The non-return structure (34) comprises a curved slider (341), the curved slider (341) is slidably engaged in a groove on the curved surface of the rotating disk (31), a telescopic column (343) is fixedly connected to the bottom of the curved slider (341), the telescopic column (343) is slidably inserted in the bottom of the groove, a compression spring (342) is embedded in the telescopic column (343), and the upper and lower ends of the compression spring (342) are respectively fixedly connected to the lower end surface of the curved slider (341) and the bottom of the groove; A cleaning unit (4) is provided below the winding roller (14), the cleaning unit (4) comprising a rectangular frame (41), the inner wall of the rectangular frame (41) being fixedly connected with bristles (42), the end of the steel wire rope (16) passing through the rectangular frame (41) and abutting against the bristles (42), the rectangular frame (41) being slidably connected to the inner wall of the load-bearing frame (15) via a guide rod (43); A hydraulic push rod (44) is fixedly connected to one end of the rectangular frame (41); the hydraulic push rod (44) is fixedly connected to the inner wall of the load-bearing frame (15); the hydraulic push rod (44) and a hydraulic pipe (455) are fixedly connected and communicated; the hydraulic pipe (455) is fixedly connected to the side wall of the rotating disk (31) via a rotating joint (454); the rotating joint (454) and a plurality of conduits (453) are fixedly connected and communicated; the plurality of conduits (453) are arranged inside the rotating disk (31); and the ends of the plurality of conduits (453) are fixedly connected to an extrusion component (45); The end of the conduit (453) is in communication with a cavity (452), the cavity (452) is formed by a piston (451) and the rotating disk (31), the piston (451) is slidably connected in the cavity (452), and the piston (451) and the telescopic column (343) are fixedly connected.

2. The safety anti-overload structure for the hoist wheel of the construction crane as claimed in claim 1, characterized in that: A lifting unit (2) is fixedly connected to the bottom of the hoisting body (1), and the lifting unit (2) comprises a support column (23), the upper end of the support column (23) extends into the interior of the load-bearing plate (17), and the support column (23) and the load-bearing plate (17) are slidably connected, the lower end of the support column (23) is fixedly connected to the mounting plate (22), a support spring (21) is nested on the support column (23), and the upper and lower ends of the support spring (21) are respectively fixedly connected to the load-bearing plate (17) and the mounting plate (22), the mounting plate (22) is provided with a mounting hole (24) for installation, and the mounting plate (22) is provided with a second opening (25) for the steel wire rope (16) to pass through.

3. The safety anti-overload structure for the hoist wheel of the construction crane as claimed in claim 2, characterized in that: Braking units (5) are provided on both sides of the winding roller (14), and the braking unit (5) comprises a support rod (51), the lower end of the support rod (51) is fixedly connected to the mounting plate (22), the upper end of the support rod (51) is fixedly connected to an abutment plate (52) that cooperates with the two ends of the winding roller (14), and the abutment plate (52) is fixedly connected to a brake pad (53).

4. The safety anti-overload structure for the hoist wheel of the construction crane as claimed in claim 3, characterized in that: The side of the arc-surface slider (341) close to the compression spring (342) should be lower than the opening of the groove on the arc-surface of the rotating disk (31), and the direction of the flat end of the arc-surface slider (341) should be consistent with the rotation direction of the rotating disk (31).

5. The safety anti-overload structure for the hoist wheel of the construction crane as claimed in claim 4, characterized in that: The cavity (452), the conduit (453) and the hydraulic pipe (455) are filled with liquid oil.

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