Rotary brake for crane

Abstract

The invention relates to the technical field of brakes, and provides a rotary brake for a crane, which comprises a base, the upper surface of the base is fixedly connected with a hydraulic pusher, the output shaft end of the hydraulic pusher is fixedly connected with a fixed plate, the upper surface of the fixed plate is fixedly connected with a first linkage rod, and the upper surface of the base is fixedly connected with two first vertical plates; two first gears movably sleeve one sides of the two groups of first vertical plates, a linkage plate is fixedly connected to the outer circular surface of one output shaft of the hydraulic pusher, a connecting rod is fixedly connected to one side of the linkage plate, a first rack is fixedly connected to one end of the connecting rod, and a connecting rod is fixedly connected to one end of the first gear; one end of the connecting rod is fixedly connected with a fixing frame, and the inner wall of the fixing frame is fixedly connected with a first spring. Through the design of the wear compensation mechanism, equipment normally brakes, and due to excessive wear of a brake pad, the output end of the hydraulic thruster needs to be shrunk downwards to compensate the wear distance compared with a normal condition.

Description

Technical Field

[0001] The present invention relates to the technical field of brakes, and in particular to a rotary brake for a crane. Background Art

[0002] A crane is a multi-action lifting machine that can lift and carry heavy objects vertically and horizontally within a certain range. Also known as an overhead crane, an overhead crane, or a crane, a crane is a mechanical device used to carry, lift, and move heavy objects. It plays an important role in the fields of construction, manufacturing, and transportation. Due to the periodic and intermittent working characteristics of the crane, each working mechanism is often in a state of frequent starting and braking. The brake has become an indispensable component of each mechanism of a power-driven crane. The brake is a device that has the function of slowing down, stopping, or keeping a moving part (or moving machinery) in a stopped state. It is a mechanical part that stops or slows down the moving parts in the machine. Commonly known as brakes and gates, it is both a control device for the work of the mechanism and a safety device to ensure the operation of the crane. Whether the brake is intact and reliable is the focus of safety inspection.

[0003] However, there are often some problems in the actual use of existing crane rotary brakes: first, the brake pads of existing rotary brakes will wear out after long-term use, and cannot be adjusted during operation. If they are not handled for a long time, the braking effect will be greatly reduced, and there will even be safety hazards. In addition, the surface roughness of the brake pads will be greatly reduced during long-term use, which affects the braking effect, greatly reduces the life of the brake pads, and requires subsequent replacement and adjustment. Summary of the invention

[0004] The present invention provides a rotary brake for a crane, which solves a problem of a rotary brake for a crane in the related art.

[0005] The technical solution of the present invention is as follows: a rotary brake for a crane comprises a base, the upper surface of the base is fixedly connected with a hydraulic pusher, the output shaft end of the hydraulic pusher is fixedly connected with a fixed plate, the upper surface of the fixed plate is fixedly connected with a first linkage rod, the upper surface of the base is fixedly connected with two first vertical plates, one side of the two groups of the first vertical plates is movably sleeved with two first gears, the outer cylindrical surface of an output shaft of the hydraulic pusher is fixedly connected with a linkage plate, one side of the linkage plate is fixedly connected with one end of a connecting rod, the other end of the connecting rod is fixedly connected with a first rack, one side of the first gear is fixedly connected with one end of a round rod, the other end of the round rod is fixedly connected with a fixed frame, the inner wall of the fixed frame is fixedly connected with a first spring, the inner wall of the fixed frame is movably sleeved with a moving block, the middle part of the moving block is fixedly connected with a cutting tool, one side of the upper surface of the base is fixedly connected with a second vertical plate, and one side of the second vertical plate is provided with a wear compensation mechanism movably sleeved with it.

[0006] Preferably, two load-bearing blocks are fixedly connected to the upper surface of the base, four connecting plates are movably sleeved on both sides of the two groups of the load-bearing blocks, the first fixing rod, the second fixing rod and the third fixing rod are movably sleeved on the inner side of the connecting plates, the outer circular surface of the first fixing rod is fixedly connected to a brake arm, one side of the brake arm is fixedly connected to two evenly distributed support rods, one end of the support rod is fixedly connected to a brake pad, and the upper and lower surfaces of the brake pad are fixedly connected to limiting plates.

[0007] Preferably, the outer circular surface of the second fixed rod on the side close to the hydraulic pusher is movably sleeved with a spring frame, the inner sides of the protrusions on both sides of the spring frame are fixedly connected with spring connecting plates, the middle part of the spring connecting plate is movably sleeved with a guide rod, the middle part of the spring frame is movably sleeved with the guide rod, one side of the spring connecting plate is fixedly connected with a second spring, one end of the second spring is fixedly connected to the inner side of the spring frame, the second spring is movably sleeved with the outer circular surface of the guide rod, and one end of the guide rod is fixedly connected to the second fixed rod close to the second vertical plate.

[0008] Preferably, the outer circular surface of the third fixed rod close to the second vertical plate is fixedly connected to the first adjustment plate, the outer circular surface of the third fixed rod close to the hydraulic pusher side is fixedly connected to two load-bearing plates, a connecting rod is movably sleeved on the middle part of one end of the outer circular surface of the first linkage rod, the two ends of the connecting rod are fixedly connected to the inner sides of the two load-bearing plates, and the inner sides of the two groups of load-bearing plates are movably sleeved with second adjustment plates.

[0009] Preferably, one end of the first adjustment plate is provided with evenly distributed trapezoidal grooves, two telescopic rods are movably sleeved on both sides of the second adjustment plate, two third springs are fixedly connected on both sides of the second adjustment plate, one end of the third spring is fixedly connected to a trapezoidal block, the trapezoidal block is fixedly connected to one end of the telescopic rod, and the trapezoidal block is engaged with the trapezoidal groove.

[0010] Preferably, the wear compensation mechanism includes a second gear, a rotating rod is movably sleeved in the middle of one end of the second vertical plate, one end of the rotating rod is fixedly connected to one side of the second gear, the other end of the rotating rod is fixedly connected to a second linkage rod, one end of the second linkage rod is fixedly connected to one side of the first adjustment plate, one side of the base is fixedly connected to an L-shaped connecting plate, the outer circular surface of the support rod close to the second vertical plate is fixedly connected to a base plate, one side of the base plate is fixedly connected to a second rack, the tooth surface of the second rack is meshed with the outer edge of the second gear, and the second rack is movably sleeved with the horizontal surface of the L-shaped connecting plate.

[0011] Preferably, the upper surface of the load-bearing block is fixedly connected to a limiting seat, the middle portion of the limiting seat is threadedly connected to a limiting screw, and the threaded surface of the limiting screw is threadedly connected to a limiting nut.

[0012] Preferably, the two groups of the first gears are half-tooth gears, the first rack is a double-sided rack, and the tooth surface of the first rack is meshed with the tooth surface of the first gear.

[0013] Preferably, the load-bearing plate is in a triangular shape, the outer circular surface of the third fixing rod is fixedly connected to the obtuse angle of the triangle, the trapezoidal block is a right-angled trapezoid, the brake pad and the limit plate are two arc-shaped curved structures, and the upper end of the brake pad is adapted to the bottom arc-shaped curved structure of the limit plate.

[0014] Preferably, a plurality of blades evenly distributed are fixedly connected to the outer cylindrical surface of the cutting tool, and the cutting tool is movably sleeved with the inner side of the brake pad and the limit plate.

[0015] The working principle and beneficial effects of the present invention are: 1. The present invention adopts the design of the cutting tool. When the equipment brakes normally, the hydraulic pusher is driven. When the output end of the hydraulic pusher extends to stop braking, the output end of the hydraulic pusher drives the first rack to move upward through the linkage plate and the connecting rod. The first rack drives the two first gears to work. The first gear drives the fixed frame to rotate. The fixed frame drives the moving block to rotate. The moving block drives the cutting tool to move from top to bottom. The moving block is squeezed by the brake pad. Under the action of the first spring, the moving block moves in the fixed frame as the rotation angle changes. When the output end of the hydraulic pusher contracts to brake, the first rack also drives the first gear to rotate, so that the cutting tool quickly passes the brake pad to the uppermost end. While not affecting the braking, the surface of the brake pad can always maintain roughness during long-term work and use, which greatly increases the braking effect of the equipment and the service life of the brake pad.

[0016] 2. Through the design of the wear compensation mechanism, the present invention allows the equipment to brake normally. Due to excessive wear of the brake pad, the output end of the hydraulic pusher needs to shrink downward to compensate for the wear distance compared to normal conditions. At this time, the support rod drives the base plate to move, the base plate drives the second rack to move, the second rack drives the second gear to rotate, and the second gear drives the first adjustment plate to be squeezed inward through the second linkage rod. The trapezoidal block is squeezed and shrinks inward, so that the trapezoidal block moves to the trapezoidal groove of the first adjustment plate. Under the action of the third spring, the trapezoidal block engages with the trapezoidal groove, thereby realizing the adjustment of the distance between the first adjustment plate and the second adjustment plate and compensating for the wear of the brake pad, thereby improving the fault tolerance of the equipment and ensuring the safety performance and braking effect of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 It is a front view of the overall structure of the present invention; Figure 2 It is a rear view of the overall structure of the present invention; Figure 3 It is a rear view of the brake pad structure of the present invention; Figure 4 It is a front view of a part of the structure of the present invention; Figure 5 For the present invention Figure 1 The enlarged schematic diagram at A in the middle; Figure 6 It is a schematic diagram of the overall structure of the second adjustment plate of the present invention; Figure 7 It is a partial structural schematic diagram of the wear compensation mechanism of the present invention.

[0019] In the figure: 1, base; 2, hydraulic pusher; 3, first linkage rod; 4, first vertical plate; 5, first gear; 6, linkage plate; 7, first rack; 8, fixed frame; 9, first spring; 10, moving block; 11, cutting tool; 12, second vertical plate; 13, load-bearing block; 14, connecting plate; 15, first fixed rod; 16, second fixed rod; 17, third fixed rod; 18, brake arm; 19, support rod; 20, brake pad; 21, limit plate; 22, spring frame; 23, spring connecting plate; 24, guide rod; 25, second spring; 26, first adjusting plate; 27, load-bearing plate; 28, second adjusting plate; 29, third spring; 30, trapezoidal block; 31, second gear; 32, second linkage rod; 33, L-shaped connecting plate; 34, base plate; 35, second rack; 36, limit seat; 37, limit screw; 38, limit nut. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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.

[0021] like Figures 1 to 7As shown, an embodiment of the present invention provides a rotary brake for a crane, comprising a base 1, a hydraulic pusher 2 is fixedly connected to the upper surface of the base 1, a fixed plate is fixedly connected to the output shaft end of the hydraulic pusher 2, a first linkage rod 3 is fixedly connected to the upper surface of the fixed plate, two first vertical plates 4 are fixedly connected to the upper surface of the base 1, two first gears 5 are movably sleeved on one side of the two groups of first vertical plates 4, a linkage plate 6 is fixedly connected to the outer cylindrical surface of an output shaft of the hydraulic pusher 2, one side of the linkage plate 6 is fixedly connected to one end of a connecting rod, the other end of the connecting rod is fixedly connected to a first rack 7, and one side of the first gear 5 is fixedly connected to one end of a round rod The other end of the round rod is fixedly connected to a fixed frame 8, the inner wall of the fixed frame 8 is fixedly connected to a first spring 9, the inner wall of the fixed frame 8 is movably sleeved with a moving block 10, the middle part of the moving block 10 is fixedly connected to a cutting tool 11, one side of the upper surface of the base 1 is fixedly connected to a second vertical plate 12, one side of the second vertical plate 12 is provided with a wear compensation mechanism movably sleeved therewith, the two groups of first gears 5 are half-tooth gears, the first rack 7 is a double-sided rack, the tooth surface of the first rack 7 is meshed with the tooth surface of the first gear 5, the outer cylindrical surface of the cutting tool 11 is fixedly connected to a number of evenly distributed blades, and the cutting tool 11 is movably sleeved with the inner side of the brake pad 20 and the limit plate 21.

[0022] Among them, two load-bearing blocks 13 are fixedly connected to the upper surface of the base 1, and four connecting plates 14 are movably sleeved on both sides of the two groups of load-bearing blocks 13. The inner side of the connecting plate 14 is movably sleeved with a first fixing rod 15, a second fixing rod 16, and a third fixing rod 17. The outer cylindrical surface of the first fixing rod 15 is fixedly connected to a brake arm 18, and one side of the brake arm 18 is fixedly connected to two evenly distributed support rods 19, and one end of the support rod 19 is fixedly connected to a brake pad 20. The upper and lower surfaces of the brake pad 20 are fixedly connected to a limiting plate 21. The outer cylindrical surface of the second fixing rod 16 on the side close to the hydraulic pusher 2 is movably sleeved with a spring frame 22, and the inner side of the spring frame 22 is fixedly connected to a spring connecting plate 23, and the middle part of the spring connecting plate 23 is movably sleeved There is a guide rod 24, the middle part of the spring frame 22 is movably sleeved with the guide rod 24, one side of the spring connecting plate 23 is fixedly connected with a second spring 25, one end of the second spring 25 is fixedly connected with the inner side of the spring frame 22, the second spring 25 is movably sleeved with the outer cylindrical surface of the guide rod 24, one end of the guide rod 24 is fixedly connected with the second fixed rod 16 near the second vertical plate 12, the outer cylindrical surface of the third fixed rod 17 near the second vertical plate 12 is fixedly connected with a first adjusting plate 26, the outer cylindrical surface of the third fixed rod 17 near the hydraulic pusher 2 is fixedly connected with two bearing plates 27, the middle part of one end of the outer cylindrical surface of the first linkage rod 3 is movably sleeved with a connecting rod, the two ends of the connecting rod are fixedly connected with the inner sides of the two bearing plates 27, and the inner sides of the two groups of bearing plates 27 are movably sleeved A second adjusting plate 28 is connected, the upper surface of the load-bearing block 13 is fixedly connected to a limited seat 36, the middle part of the limited seat 36 is threadedly connected to a limited screw 37, and the threaded surface of the limited screw 37 is threadedly connected to a limited nut 38. The load-bearing plate 27 is triangular in shape, and the outer cylindrical surface of the third fixing rod 17 is fixedly connected to the obtuse angle of the triangle. The trapezoidal block 30 is a right-angled trapezoid, and the brake pad 20 and the limit plate 21 are two arc-shaped curved structures. The upper end of the brake pad 20 is adapted to the bottom arc-shaped curved structure of the limit plate 21. When the equipment is working normally, the limit screw 37 is adjusted so that the brake arm 18 maintains a suitable angle and locks the limit nut 38, driving the hydraulic pusher 2. The output end of the hydraulic pusher 2 contracts and drives the first linkage rod 3 to descend. The linkage rod 3 drives the first adjusting plate 26 and the second adjusting plate 28 to make relative movement through the load-bearing plate 27. The first adjusting plate 26 and the second adjusting plate 28 drive the connecting plate 14 to make relative movement through the third fixed rod 17. The connecting plate 14 drives the guide rod 24 to move through the second fixed rod 16. The guide rod 24 causes the second spring 25 to be extruded and deformed. The connecting plate 14 drives the brake arm 18 to work through the first fixed rod 15. The brake arm 18 drives the brake pad 20 to work through the support rod 19. The braking effect is generated by the friction between the brake pad 20 and the target working roller. When it is necessary to stop braking, the hydraulic pusher 2 is driven, the output shaft end of the hydraulic pusher 2 rises, and the second spring 25 rebounds, thereby realizing the stopping of braking and determining the position of the connecting plate 14.

[0023] Among them, the wear compensation mechanism includes a second gear 31, a rotating rod is movably sleeved in the middle of one end of the second vertical plate 12, one end of the rotating rod is fixedly connected to one side of the second gear 31, and the other end of the rotating rod is fixedly connected to a second linkage rod 32, one end of the second linkage rod 32 is fixedly connected to one side of the first adjustment plate 26, an L-shaped connecting plate 33 is fixedly connected to one side of the base 1, and a base plate 34 is fixedly connected to the outer cylindrical surface of the support rod 19 close to one side of the second vertical plate 12, and a second rack 35 is fixedly connected to one side of the base plate 34, and the tooth surface of the second rack 35 is meshed with the outer edge of the second gear 31, and the second rack 35 is movably sleeved with the transverse surface of the L-shaped connecting plate 33, and one end of the first adjustment plate 26 is provided with evenly distributed trapezoidal grooves, and two telescopic rods are movably sleeved on both sides of the second adjustment plate 28, and two third springs 29 are fixedly connected on both sides of the second adjustment plate 28. One end of the third spring 29 is fixedly connected with a trapezoidal block 30, and the trapezoidal block 30 is fixedly connected to one end of the telescopic rod, and the trapezoidal block 30 is meshed with the trapezoidal groove. When the equipment is braked normally, due to excessive wear of the brake pad, the output end of the hydraulic pusher 2 needs to be retracted downward to compensate for the wear distance compared to normal conditions. At this time, the support rod 19 drives the base plate 34 to move, the base plate 34 drives the second rack 35 to move, the second rack 35 drives the second gear 31 to rotate, and the second gear 31 drives the first adjusting plate 26 to be squeezed inward through the second linkage rod 32. The trapezoidal block 30 is squeezed and shrinks inward, so that the trapezoidal block 30 moves to the trapezoidal groove of the first adjusting plate 26. Under the action of the third spring 29, the trapezoidal block 30 is meshed with the trapezoidal groove, thereby realizing the adjustment of the distance between the first adjusting plate 26 and the second adjusting plate 28, and compensating for the wear of the brake pad.

[0024] Working principle: When the equipment is working normally, the limit screw 37 is adjusted to keep the brake arm 18 at a suitable angle and the limit nut 38 is locked to drive the hydraulic pusher 2. The output end of the hydraulic pusher 2 contracts and drives the first linkage rod 3 to descend. The first linkage rod 3 drives the first adjusting plate 26 and the second adjusting plate 28 to move relative to each other through the load-bearing plate 27. The first adjusting plate 26 and the second adjusting plate 28 drive the connecting plate 14 to move relative to each other through the third fixed rod 17. The connecting plate 14 drives the guide rod 24 to move through the second fixed rod 16. The guide rod 24 causes the second spring 25 to be extruded and deformed. The connecting plate 14 drives the brake arm 18 to work through the first fixed rod 15. The brake arm 18 drives the brake pad 20 to work through the support rod 19. The braking effect is generated by the friction between the brake pad 20 and the target working roller. When it is necessary to stop braking, the hydraulic pusher 2 is driven, the output shaft end of the hydraulic pusher 2 rises, and the second spring 25 rebounds, so as to stop the braking and determine the position of the connecting plate 14.

[0025] In addition, when it is necessary to increase the roughness of the brake pad 20, when the equipment is braking normally, the hydraulic pusher 2 is driven. When the output end of the hydraulic pusher 2 extends to stop braking, the output end of the hydraulic pusher 2 drives the first rack 7 to move upward through the linkage plate 6 and the connecting rod. The first rack 7 drives the two first gears 5 to work, and the first gear 5 drives the fixed frame 8 to rotate. The fixed frame 8 drives the moving block 10 to rotate. The moving block 10 drives the cutting tool 11 to move from top to bottom. The moving block 10 is squeezed by the brake pad 20. Under the action of the first spring 9, the moving block 10 moves in the fixed frame 8 as the rotation angle changes, thereby achieving different degrees of cutting on the surface of the brake pad 20, which greatly improves the roughness of the surface of the brake pad 20 and enhances the braking effect. When the output end of the hydraulic pusher 2 contracts to brake, the first rack 7 will also drive the first gear 5 to rotate, so that the cutting tool 11 quickly passes through the brake pad 20 to the uppermost end.

[0026] Finally, when the brake pad 20 is excessively worn and the wear needs to be compensated, the equipment brakes normally. Due to the excessive wear of the brake pad, the output end of the hydraulic pusher 2 needs to shrink downward to compensate for the wear distance compared to normal. At this time, the support rod 19 drives the base plate 34 to move, the base plate 34 drives the second rack 35 to move, the second rack 35 drives the second gear 31 to rotate, and the second gear 31 drives the first adjustment plate 26 to be squeezed inward through the second linkage rod 32. The trapezoidal block 30 is squeezed and shrinks inward, so that the trapezoidal block 30 moves to the trapezoidal groove of the first adjustment plate 26. Under the action of the third spring 29, the trapezoidal block 30 engages with the trapezoidal groove, thereby realizing the adjustment of the distance between the first adjustment plate 26 and the second adjustment plate 28, and compensating for the brake pad wear.

[0027] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotary brake for a crane, comprising a base (1), a hydraulic pusher (2) fixedly connected to the upper surface of the base (1), a fixed plate fixedly connected to the output shaft end of the hydraulic pusher (2), a first linkage rod (3) fixedly connected to the upper surface of the fixed plate, characterized in that: Two first vertical plates (4) are fixedly connected to the upper surface of the base (1), and two first gears (5) are movably sleeved on one side of the two groups of the first vertical plates (4). A linkage plate (6) is fixedly connected to the outer cylindrical surface of an output shaft of the hydraulic pusher (2), and one side of the linkage plate (6) is fixedly connected to one end of a connecting rod, and the other end of the connecting rod is fixedly connected to a first rack (7). One side of the first gear (5) is fixedly connected to one end of a round rod, and the other end of the round rod is fixedly connected to a fixed frame (8). The inner wall of the fixed frame (8) is fixedly connected to a first spring (9), and a moving block (10) is movably sleeved on the inner wall of the fixed frame (8). A cutting tool (11) is fixedly connected to the middle part of the moving block (10). A second vertical plate (12) is fixedly connected to one side of the upper surface of the base (1), and one side of the second vertical plate (12) is provided with a wear compensation mechanism movably sleeved therewith.

2. A rotary brake for a crane according to claim 1, characterized in that: Two load-bearing blocks (13) are fixedly connected to the upper surface of the base (1); four connecting plates (14) are movably sleeved on both sides of the two groups of load-bearing blocks (13); a first fixing rod (15), a second fixing rod (16), and a third fixing rod (17) are movably sleeved on the inner side of the connecting plates (14); a brake arm (18) is fixedly connected to the outer circumferential surface of the first fixing rod (15); two evenly distributed support rods (19) are fixedly connected to one side of the brake arm (18); a brake pad (20) is fixedly connected to one end of the support rod (19); and the upper and lower surfaces of the brake pad (20) are fixedly connected to a limiting plate (21).

3. A rotary brake for a crane according to claim 2, characterized in that: The outer circumferential surface of the second fixed rod (16) on the side close to the hydraulic pusher (2) is movably sleeved with a spring frame (22); the inner sides of the protrusions on both sides of the spring frame (22) are fixedly connected with spring connecting plates (23); the middle part of the spring connecting plate (23) is movably sleeved with a guide rod (24); the middle part of the spring frame (22) is movably sleeved with the guide rod (24); one side of the spring connecting plate (23) is fixedly connected with a second spring (25); one end of the second spring (25) is fixedly connected to the inner side of the spring frame (22); the second spring (25) is movably sleeved with the outer circumferential surface of the guide rod (24); and one end of the guide rod (24) is fixedly connected to the second fixed rod (16) on the side close to the second vertical plate (12).

4. A rotary brake for a crane according to claim 3, characterized in that: The outer cylindrical surface of the third fixed rod (17) close to the second vertical plate (12) is fixedly connected to the first adjustment plate (26), the outer cylindrical surface of the third fixed rod (17) close to the hydraulic pusher (2) is fixedly connected to two load-bearing plates (27), a connecting rod is movably sleeved at the middle of one end of the outer cylindrical surface of the first linkage rod (3), the two ends of the connecting rod are fixedly connected to the inner sides of the two load-bearing plates (27), and the inner sides of the two groups of the load-bearing plates (27) are movably sleeved with second adjustment plates (28).

5. A rotary brake for a crane according to claim 4, characterized in that: One end of the first adjustment plate (26) is provided with evenly distributed trapezoidal grooves, two telescopic rods are movably sleeved on both sides of the second adjustment plate (28), two third springs (29) are fixedly connected to both sides of the second adjustment plate (28), one end of the third spring (29) is fixedly connected to a trapezoidal block (30), the trapezoidal block (30) is fixedly connected to one end of the telescopic rod, and the trapezoidal block (30) is meshed with the trapezoidal groove.

6. A rotary brake for a crane according to claim 5, characterized in that: The wear compensation mechanism comprises a second gear (31), a rotating rod is movably sleeved in the middle of one end of the second vertical plate (12), one end of the rotating rod is fixedly connected to one side of the second gear (31), the other end of the rotating rod is fixedly connected to a second linkage rod (32), one end of the second linkage rod (32) is fixedly connected to one side of the first adjustment plate (26), one side of the base (1) is fixedly connected to an L-shaped connecting plate (33), the outer circumferential surface of the support rod (19) close to the second vertical plate (12) is fixedly connected to a base plate (34), one side of the base plate (34) is fixedly connected to a second rack (35), the tooth surface of the second rack (35) is meshed with the outer edge of the second gear (31), and the second rack (35) is movably sleeved to the horizontal surface of the L-shaped connecting plate (33).

7. A rotary brake for a crane according to claim 6, characterized in that: The upper surface of the load-bearing block (13) is fixedly connected to a limit seat (36), the middle portion of the limit seat (36) is threadedly connected to a limit screw (37), and the threaded surface of the limit screw (37) is threadedly connected to a limit nut (38).

8. A rotary brake for a crane according to claim 7, characterized in that: The two sets of the first gears (5) are half-tooth gears, the first rack (7) is a double-sided rack, and the tooth surface of the first rack (7) meshes with the tooth surface of the first gear (5).

9. A rotary brake for a crane according to claim 8, characterized in that: The load-bearing plate (27) is in a triangular shape, the outer circumferential surface of the third fixing rod (17) is fixedly connected to the obtuse angle of the triangle, the trapezoidal block (30) is a right-angled trapezoid, the brake pad (20) and the limit plate (21) are two arc-shaped curved structures, and the upper end of the brake pad (20) is adapted to the bottom arc-shaped curved structure of the limit plate (21).

10. A rotary brake for a crane according to claim 9, characterized in that: A plurality of blades that are evenly distributed are fixedly connected to the outer cylindrical surface of the cutting tool (11), and the cutting tool (11) is movably sleeved with the inner side of the brake pad (20) and the limit plate (21).

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