Overload protection electric hoist

Abstract

The invention relates to the technical field of electric hoists, in particular to an anti-overload protection electric hoist. According to the anti-overload protection electric hoist, after locking of the brake is relieved, the descending speed of a heavy object can be reduced, manpower is saved, and the operation safety and efficiency are improved. An overload protection electric hoist comprises an electric hoist body, a first servo motor, a load increasing mechanism and the like, the right side of the lower portion of the electric hoist body is connected with the first servo motor, and the load increasing mechanism capable of detecting the load weight is arranged on the electric hoist body. When a heavy object needs to be lowered, the brake is removed, then the winding drum and the first friction disc rotate, the rotating speed of the first friction disc is reduced through friction force between the second friction disc and the first friction disc, then the rotating speed of the winding drum is reduced, the heavy object is lowered slowly, the descending speed of the heavy object can be reduced after locking of the brake is removed, and manpower is saved; and the operation safety and efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric hoists, and in particular to an anti-overload protection electric hoist. Background Art

[0002] Electric hoist is a commonly used lifting equipment, widely used in factories, warehouses, construction sites, docks and other occasions for lifting, transporting and installing heavy objects. It is driven by an electric motor, combined with components such as a reducer and a drum, to achieve vertical or horizontal movement of heavy objects. In order to avoid damage to key components such as motors and reducers due to overload operation, or even cause safety accidents, existing electric hoists are usually equipped with overload protection devices when lifting heavy objects. When the weight of the heavy object exceeds the set value, the power supply of the motor is immediately cut off to prevent overload. However, after the power supply of the motor is cut off, the brake will automatically lock the drum to prevent the heavy object from falling freely due to its own weight. When the heavy object needs to be lowered, manual operation is required to release the brake lock, and then the staff can safely and slowly put down the heavy object, which consumes manpower and is inefficient, and there are safety hazards.

[0003] Therefore, an overload protection electric hoist has been developed which can slow down the descending speed of heavy objects after the brake is released, save manpower, and improve operational safety and efficiency. Summary of the invention

[0004] In order to overcome the disadvantages of the existing electric hoist, when a heavy object needs to be lowered, manual operation is required to release the brake lock, and then the staff can lower the heavy object safely and slowly, which consumes manpower and is inefficient, and also has potential safety hazards. The present invention provides an anti-overload protection electric hoist which can slow down the descent speed of the heavy object after the brake lock is released, saves manpower, and improves operational safety and efficiency.

[0005] The technical solution is as follows: an anti-overload protection electric hoist, including an electric hoist, a first servo motor, a load-increasing mechanism and a deceleration mechanism. The first servo motor is connected to the right side of the lower part of the electric hoist. The electric hoist is provided with a load-increasing mechanism that can detect the load weight. The electric hoist is also provided with a deceleration mechanism that can slow down the load descent speed.

[0006] Preferably, the load-increasing mechanism includes a first fixed plate, a sliding rod, a second fixed plate, a first spring, a second servo motor, a first roller, a dynamometer and a dynamometer; the first fixed plate is connected to the upper side of the electric hoist; a plurality of sliding rods are connected to the upper side of the first fixed plate; a second fixed plate is slidably connected between the sliding rods; a first spring is connected between the sliding rods and the second fixed plate; the second servo motor is connected to the front and rear sides of the second fixed plate; the first servo motor output shaft is connected to the first roller; two front and rear dynamometers are connected to the lower middle side of the second fixed plate; the front upper part of the first fixed plate is connected to the Tension gauges are connected to the rear two sides, and the tension gauges are connected to adjacent tension gauges, which are electrically connected to the first servo motor. The weight is hung on the hook, and then the first servo motor is started to rotate the drum to reel in the steel cable so that the hook moves upward to lift the weight. When the weight is lifted, the first fixed plate and the slide bar move downward due to gravity, and the first spring is stretched. The weight of the weight is detected by the tension gauge and the tension gauge. When it is detected that the weight of the weight is overloaded, the first servo motor is controlled to close. At this time, the brake in the electric hoist starts the brake drum to prevent the weight from falling freely due to its own weight.

[0007] Preferably, the reduction mechanism includes a fixed frame, a first rack, a bearing rod, a gear, a plug-in, a second spring, a first friction disc, a second rack and a second friction disc. The second fixed plate is connected to the fixed frame, and the lower side of the left portion of the fixed frame is connected to the front and rear first racks. The lower side of the left portion of the electric hoist is connected to the bearing rod. The front and rear sides of the left portion of the bearing rod are rotatably connected to gears, and the gears are meshed with adjacent first racks. A plug-in is slidably connected to the bearing rod. The first friction disc is connected to the left side of the first servo motor output shaft, and the bearing rod is rotatably connected to the first friction disc. The lower sides of the front and rear portions of the plug-in are connected to the second racks, and the second racks are meshed with adjacent gears. The second friction disc is slidably connected to the bearing rod. A second spring is connected between the wiping disc and the plug-in. When the electric hoist moves downward, the bearing rod is driven to move downward, so that the first rack and the gear are meshed and moved, and the gear and the second rack are meshed and moved, pushing the plug-in to move right, and the second friction disc is pushed to move right by the force of the second spring. When the weight of the heavy object exceeds the set value, the plug-in moves to the right and contacts the second friction disc, pushing the second friction disc to move until it contacts and presses against the first friction disc, and the second spring is squeezed and contracted. When the heavy object needs to be lowered, the brake is released, and then the reel and the first friction disc are rotated. The friction force between the second friction disc and the first friction disc slows down the rotation speed of the first friction disc, and then slows down the rotation speed of the reel, so that the heavy object is slowly lowered.

[0008] Preferably, an anti-sway mechanism is also included, which includes a third fixed plate, a connecting plate, an anti-sway part, a first fixed seat, a telescopic sleeve and a third spring. The third fixed plate is connected to the front and rear sides of the lower part of the electric hoist, and the third fixed plate is rotatably connected to the connecting plate. The lower part of the connecting plate is connected to the anti-sway part, the middle part of the connecting plate is connected to the first fixed seat, and the lower side of the third fixed plate is also connected to the first fixed seat. A connecting block is rotatably provided on the first fixed seat, and a telescopic sleeve is connected between two adjacent connecting blocks. A third spring is connected between two adjacent connecting blocks. When the weight of the heavy object is within the set value, the connecting plate is rotated to move the anti-sway parts away from each other, the telescopic sleeve and the third spring are stretched, and the heavy object is lifted to a certain height so that the hook is located between the anti-sway parts. Then the connecting plate is released, the telescopic sleeve is restored, and the third spring rebounds, so that the anti-sway parts are close to each other to clamp the hook.

[0009] Preferably, the anti-sway parts are all arc-shaped.

[0010] Preferably, a stabilizing mechanism is also included, which includes a fourth fixed plate, a mounting seat, a rotating plate, a second roller and a first torsion spring, the fourth fixed plate is connected to the front and rear sides of the upper part of the second fixed plate, the upper side of the fourth fixed plate is connected to the mounting seat, the mounting seat is rotatably connected to the rotating plate, the upper part of the rotating plate is rotatably connected to the second roller, the first torsion spring is connected between the rotating plate and the connected mounting seat, the second roller on the rotating plate is always kept in contact with the upper side of the track through the action of the first torsion spring, and when the second fixed plate moves, the second roller rotates and moves on the track.

[0011] Preferably, a cooling mechanism is also included, which includes a second fixed seat, a coolant barrel and a nozzle. The second fixed seat is connected to the left side of the upper part of the electric hoist, the upper side of the second fixed seat is connected to the coolant barrel, and the front and rear sides of the coolant barrel are connected to the nozzle. When the first friction disk rotates, coolant is introduced into the coolant barrel, so that the nozzle sprays the coolant between the first friction disk and the second friction disk.

[0012] Preferably, the nozzles are made of flexible material.

[0013] Preferably, each nozzle is provided with a nozzle.

[0014] Preferably, a buffer mechanism is also included, which includes a fixing part, a connecting rod, a second torsion spring and a limiting wheel. Two left and right fixing parts are connected to the side of the lower part of the anti-sway part that are away from each other. A connecting rod is rotatably connected between two adjacent fixing parts. A second torsion spring is connected between the fixing parts and the connected connecting rods. The lower part of the connecting rod is rotatably connected to the limiting wheel. After the heavy object is hung on the hook, the limiting wheels on the connecting rod are contacted with each other through the force of the second torsion spring to clamp the heavy object hanging rope.

[0015] The beneficial effects of the present invention are: 1. When it is necessary to lower a heavy object, the brake is released, and then the drum and the first friction disc are rotated. The friction between the second friction disc and the first friction disc slows down the rotation speed of the first friction disc, and then slows down the rotation speed of the drum, so that the heavy object is slowly lowered, achieving the effect of slowing down the descent speed of the heavy object after the brake is released, saving manpower, and improving operational safety and efficiency.

[0016] 2. When the heavy object is lifted by the present invention, the first fixed plate and the slide rod move downward due to gravity, the first spring is stretched, and the weight of the heavy object is detected by the dynamometer and the tension meter. When it is detected that the weight of the heavy object is overloaded, the first servo motor is controlled to be turned off, thereby achieving the effect of being able to detect the weight of the heavy object and avoiding overload damage to the electric hoist.

[0017] 3. When the weight of the heavy object is within the set value, the present invention rotates the connecting plate to move the anti-sway parts away from each other, stretches the telescopic sleeve and the third spring, and then lifts the heavy object to a certain height so that the hook is located between the anti-sway parts. Thereafter, the connecting plate is loosened, the telescopic sleeve is restored, and the third spring rebounds, so that the anti-sway parts are close to each other and clamp the hook, thereby preventing the electric hoist hook from shaking and improving the stability of heavy object transportation.

[0018] 4. The present invention uses the force of the first torsion spring to keep the second roller on the rotating plate in contact with the upper side of the track at all times. When the second fixed plate moves, the second roller rotates and moves on the track, thereby achieving the effect of improving the stability of the second fixed plate when moving on the track.

[0019] 5. In the present invention, when the first friction disk rotates, coolant is introduced into the coolant barrel, so that the nozzle sprays the coolant between the first friction disk and the second friction disk, thereby achieving the effect of cooling the first friction disk and the second friction disk and reducing wear.

[0020] 6. After the weight is hung on the hook, the force of the second torsion spring causes the limiting wheels on the connecting rod to contact each other to clamp the weight hanging rope, thereby achieving the effect of limiting the weight hanging rope and slowing down the shaking of the weight. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 It is a partial three-dimensional structural schematic diagram of the present invention.

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the load-increasing mechanism of the present invention.

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the speed reduction mechanism of the present invention.

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the anti-sway mechanism of the present invention.

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the stabilizing mechanism of the present invention.

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the guide mechanism of the present invention.

[0028] Figure 8 It is a three-dimensional structural schematic diagram of the buffer mechanism of the present invention.

[0029] Description of the accompanying drawings: 1_electric hoist, 2_first servo motor, 3_load-increasing mechanism, 31_first fixed plate, 32_slide rod, 33_second fixed plate, 34_first spring, 35_second servo motor, 36_first roller, 37_tension meter, 38_tension meter, 4_reduction mechanism, 41_fixed frame, 42_first rack, 43_bearing rod, 44_gear, 45_plug-in, 46_second spring, 47_first friction disc, 48_second rack, 49_second friction disc , 5_anti-sway mechanism, 51_third fixed plate, 52_connecting plate, 53_anti-sway part, 54_first fixed seat, 55_telescopic sleeve, 56_third spring, 6_stabilizing mechanism, 61_fourth fixed plate, 62_mounting seat, 63_rotating plate, 64_second roller, 65_first torsion spring, 7_cooling mechanism, 71_second fixed seat, 72_cooling liquid barrel, 73_nozzle, 8_buffer mechanism, 81_fixed part, 82_connecting rod, 83_second torsion spring, 84_limiting wheel. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] An overload protection electric hoist, such as Figure 1-Figure 8 As shown, it includes an electric hoist 1, a first servo motor 2, a load-increasing mechanism 3 and a speed reduction mechanism 4. The first servo motor 2 is connected to the right side of the lower part of the electric hoist 1. The electric hoist 1 is provided with the load-increasing mechanism 3 and the speed reduction mechanism 4.

[0032] like Figure 1 and Figure 3As shown, the load-increasing mechanism 3 includes a first fixed plate 31, a slide bar 32, a second fixed plate 33, a first spring 34, a second servo motor 35, a first roller 36, a tension gauge 37 and a tension meter 38. The first fixed plate 31 is connected to the upper side of the electric hoist 1, and four slide bars 32 are connected to the upper side of the first fixed plate 31. The second fixed plate 33 is slidably connected between the slide bars 32, and the first spring 34 is connected between the slide bars 32 and the second fixed plate 33. The second servo motor 35 is connected to the front and rear sides of the second fixed plate 33, and the first roller 36 is connected to the output shaft of the second servo motor 35. The front and rear two tension gauges 37 are connected to the lower middle side of the second fixed plate 33, and the tension meter 38 is connected to the front and rear sides of the upper part of the first fixed plate 31. The tension gauges 37 are connected to the adjacent tension gauges 38, and the tension gauges 38 are electrically connected to the first servo motor 2.

[0033] like Figure 1 and Figure 4 As shown, the reduction mechanism 4 includes a fixed frame 41, a first rack 42, a bearing rod 43, a gear 44, a plug-in 45, a second spring 46, a first friction disc 47, a second rack 48 and a second friction disc 49. The second fixed plate 33 is connected to the fixed frame 41, and the lower left side of the fixed frame 41 is connected to the front and rear first racks 42, the lower left side of the electric hoist 1 is connected to the bearing rod 43, the front and rear sides of the left side of the bearing rod 43 are rotatably connected to the gears 44, and the gears 44 are meshed with the adjacent first racks 42, and the bearing rod 43 is slidably connected to the plug-in 45, the first servo motor 2 output shaft is connected to the first friction disc 47 on the left side, the bearing rod 43 is rotatably connected to the first friction disc 47, the lower front and rear sides of the plug-in 45 are connected to the second rack 48, and the second rack 48 is meshed with the adjacent gear 44, the bearing rod 43 is slidably connected to the second friction disc 49, and the second spring 46 is connected between the second friction disc 49 and the plug-in 45.

[0034] When using the present invention, firstly, the second fixing plate 33 is installed in the running track of the electric hoist 1, so that the first roller 36 contacts the track, and then the second servo motor 35 is started to drive the first roller 36 to rotate, so that the second fixing plate 33 moves on the track, and then the electric hoist 1 is driven to move to the heavy object transportation position. When the electric hoist 1 moves to the specified position, the heavy object is hung on the hook, and then the first servo motor 2 is started to rotate the drum to reel in the steel cable so that the hook moves upward to lift the heavy object. When the heavy object is lifted, the first fixing plate 31 and the slide bar 32 move downward due to gravity, and the first spring 34 is stretched. The weight of the heavy object is detected by the tension meter 37 and the tension meter 38. When it is detected that the weight of the heavy object is overloaded, the first servo motor 2 is controlled to be turned off. At this time, the brake in the electric hoist 1 starts the brake drum to prevent the heavy object from falling freely due to its own weight, thereby playing a role in detecting the weight of the heavy object and avoiding overload damage to the electric hoist 1. After the heavy object is unloaded, the first spring 34 rebounds to drive the first fixing plate 31 and the slide bar 32 to reset. When the electric hoist 1 moves downward, it drives the bearing rod 43 to move downward, so that the first rack 42 and the gear 44 mesh and move, so that the gear 44 and the second rack 48 mesh and move, push the plug-in 45 to move right, and the second friction disc 49 is pushed to move right by the force of the second spring 46. When the weight of the heavy object exceeds the set value, the plug-in 45 moves to the right and contacts the second friction disc 49, pushing the second friction disc 49 to move to contact and press with the first friction disc 47, and the second spring 46 is squeezed and contracted. When it is necessary to lower the heavy object, the brake is released, and then the drum and the first friction disc 47 are rotated. The friction between the second friction disc 49 and the first friction disc 47 slows down the rotation speed of the first friction disc 47, and then slows down the rotation speed of the drum, so that the heavy object is slowly lowered, thereby slowing down the descent speed of the heavy object after the brake is released, saving manpower, and improving the safety and efficiency of operation.

[0035] like Figure 1 and Figure 5 As shown, an anti-sway mechanism 5 is also included, and the anti-sway mechanism 5 includes a third fixed plate 51, a connecting plate 52, an anti-sway member 53, a first fixed seat 54, a telescopic sleeve 55 and a third spring 56. The third fixed plate 51 is connected to the front and rear sides of the lower part of the electric hoist 1. The third fixed plate 51 is rotatably connected to the connecting plate 52. The lower part of the connecting plate 52 is connected to the anti-sway member 53. The anti-sway member 53 is arc-shaped for easy clamping of the hook. The middle part of the connecting plate 52 is connected to the first fixed seat 54, and the lower side of the third fixed plate 51 is also connected to the first fixed seat 54. A connecting block is rotatably provided on the first fixed seat 54, and a telescopic sleeve 55 is connected between two adjacent connecting blocks, and a third spring 56 is connected between two adjacent connecting blocks.

[0036] The anti-sway mechanism 5 of the device can prevent the hook from swaying. When the weight of the heavy object is within the set value, the connecting plate 52 is rotated to make the anti-sway parts 53 move away from each other, the telescopic sleeve 55 and the third spring 56 are stretched, and then the heavy object is lifted to a certain height so that the hook is located between the anti-sway parts 53. Thereafter, the connecting plate 52 is loosened, the telescopic sleeve 55 is restored, and the third spring 56 rebounds, so that the anti-sway parts 53 are close to each other to clamp the hook, thereby preventing the electric hoist hook from swaying and improving the stability of heavy object transportation.

[0037] like Figure 1 and Figure 6 As shown, a stabilizing mechanism 6 is also included, and the stabilizing mechanism 6 includes a fourth fixed plate 61, a mounting seat 62, a rotating plate 63, a second roller 64 and a first torsion spring 65. The front and rear sides of the upper part of the second fixed plate 33 are connected to the fourth fixed plate 61, the upper side of the fourth fixed plate 61 is connected to the mounting seat 62, the mounting seat 62 is rotatably connected to the rotating plate 63, the upper part of the rotating plate 63 is rotatably connected to the second roller 64, and the first torsion spring 65 is connected between the rotating plate 63 and the connected mounting seat 62.

[0038] By using the stabilizing mechanism 6 of the device, the stability of the second fixed plate 33 when it moves on the track can be improved. The second roller 64 on the rotating plate 63 is always kept in contact with the upper side of the track through the force of the first torsion spring 65. When the second fixed plate 33 moves, the second roller 64 rotates and moves on the track, thereby improving the stability of the second fixed plate 33 when it moves on the track.

[0039] like Figure 1 and Figure 7 As shown, a cooling mechanism 7 is also included, and the cooling mechanism 7 includes a second fixed seat 71, a coolant barrel 72 and a nozzle 73. The second fixed seat 71 is connected to the left side of the upper part of the electric hoist 1, and the coolant barrel 72 is connected to the upper side of the second fixed seat 71. The front and rear sides of the coolant barrel 72 are connected to the nozzle 73. The nozzle 73 is made of flexible material to facilitate the adjustment of the spray direction. The nozzle 73 is provided with a nozzle to facilitate the spraying of the coolant.

[0040] By using the cooling mechanism 7 of the device, the first friction disk 47 and the second friction disk 49 can be cooled. When the first friction disk 47 rotates, coolant is introduced into the coolant barrel 72, so that the nozzle 73 sprays the coolant between the first friction disk 47 and the second friction disk 49, thereby playing a role in cooling the first friction disk 47 and the second friction disk 49 and reducing wear.

[0041] like Figure 1 and Figure 8As shown, a buffer mechanism 8 is also included, and the buffer mechanism 8 includes a fixing member 81, a connecting rod 82, a second torsion spring 83 and a limiting wheel 84. The left and right fixing members 81 are connected to the side of the lower part of the anti-sway member 53 that is away from each other, and the connecting rod 82 is rotatably connected between the two adjacent fixing members 81. The second torsion spring 83 is connected between the fixing members 81 and the connected connecting rod 82, and the lower part of the connecting rod 82 is rotatably connected to the limiting wheel 84.

[0042] By using the buffer mechanism 8 of the device, the heavy object hanging rope can be limited. After the heavy object is hung on the hook, the force of the second torsion spring 83 makes the limiting wheels 84 on the connecting rod 82 contact each other to clamp the heavy object hanging rope, thereby limiting the heavy object hanging rope and reducing the shaking of the heavy object.

[0043] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An overload protection electric hoist, characterized in that: The electric hoist (1) comprises an electric hoist (1), a first servo motor (2), a load-increasing mechanism (3) and a speed reducing mechanism (4). The first servo motor (2) is connected to the right side of the lower part of the electric hoist (1). The electric hoist (1) is provided with a load-increasing mechanism (3) capable of detecting the weight of a load. The electric hoist (1) is also provided with a speed reducing mechanism (4) capable of slowing down the speed at which the load descends.

2. The overload protection electric hoist according to claim 1, characterized in that: The load-increasing mechanism (3) comprises a first fixed plate (31), a sliding rod (32), a second fixed plate (33), a first spring (34), a second servo motor (35), a first roller (36), a tension meter (37) and a tension meter (38); the first fixed plate (31) is connected to the upper side of the electric hoist (1); a plurality of sliding rods (32) are connected to the upper side of the first fixed plate (31); the second fixed plate (33) is slidably connected between the sliding rods (32); the first spring (34) is connected between the sliding rods (32) and the second fixed plate (33); the second servo motor (35) is connected to the front and rear sides of the second fixed plate (33); the output shaft of the second servo motor (35) is connected to the first roller (36); the lower middle part of the second fixed plate (33) is connected to the front The rear two tension gauges (37) are connected to tension gauges (38) on both the front and rear sides of the upper part of the first fixed plate (31). The tension gauges (37) are connected to adjacent tension gauges (38), and the tension gauges (38) are electrically connected to the first servo motor (2). A heavy object is hung on the hook, and then the first servo motor (2) is started to rotate the drum to reel in the steel cable so that the hook moves upward to lift the heavy object. When the heavy object is lifted, the first fixed plate (31) and the slide bar (32) move downward due to gravity, and the first spring (34) stretches. The weight of the heavy object is detected by the tension gauge (37) and the tension gauge (38). When it is detected that the weight of the heavy object is overloaded, the first servo motor (2) is controlled to be turned off. At this time, the brake in the electric hoist (1) starts the brake drum to prevent the heavy object from falling freely due to its own weight.

3. The overload protection electric hoist according to claim 2 is characterized in that: The speed reduction mechanism (4) comprises a fixing frame (41), a first rack (42), a bearing rod (43), a gear (44), a plug-in unit (45), a second spring (46), a first friction disc (47), a second rack (48) and a second friction disc (49); the fixing frame (41) is connected to the second fixing plate (33); the fixing frame (41) is connected to the front and rear first racks (42) at the lower left side; the electric hoist (1) is connected to the bearing rod (43) at the lower left side; the bearing rod (43) is connected to the left side. The front and rear sides are both rotatably connected with gears (44), and the gears (44) are meshed with adjacent first racks (42). A plug-in unit (45) is slidably connected to the bearing rod (43). A first friction disk (47) is connected to the left side of the output shaft of the first servo motor (2). The bearing rod (43) is rotatably connected to the first friction disk (47). The lower sides of the front and rear parts of the plug-in unit (45) are both connected with second racks (48), and the second racks (48) are meshed with adjacent gears (44). A second friction disk (49) is slidably connected, and a second spring (46) is connected between the second friction disk (49) and the plug-in (45). When the electric hoist (1) moves downward, the bearing rod (43) is driven to move downward, so that the first rack (42) and the gear (44) mesh and move, so that the gear (44) and the second rack (48) mesh and move, pushing the plug-in (45) to move rightward, and the second friction disk (49) is pushed to move rightward by the action force of the second spring (46). When the weight of the heavy object is When the set value is exceeded, the plug-in (45) moves to the right and contacts the second friction disk (49), pushing the second friction disk (49) to move to contact and press the first friction disk (47), and the second spring (46) is squeezed and contracted. When the heavy object needs to be lowered, the brake is released, and then the reel and the first friction disk (47) are rotated. The friction force between the second friction disk (49) and the first friction disk (47) slows down the rotation speed of the first friction disk (47), thereby slowing down the rotation speed of the reel, so that the heavy object is slowly lowered.

4. The overload protection electric hoist according to claim 3 is characterized in that: The electric hoist (1) further comprises an anti-sway mechanism (5), the anti-sway mechanism (5) comprising a third fixing plate (51), a connecting plate (52), an anti-sway member (53), a first fixing seat (54), a telescopic sleeve (55) and a third spring (56), the front and rear sides of the lower part of the electric hoist (1) are connected to the third fixing plate (51), the connecting plate (52) is rotatably connected to the third fixing plate (51), the lower part of the connecting plate (52) is connected to the anti-sway member (53), the middle part of the connecting plate (52) is connected to the first fixing seat (54), the lower side of the third fixing plate (51) is also connected to the first fixing seat (54), and the first A connecting block is rotatably provided on the fixed seat (54), a telescopic sleeve (55) is connected between two adjacent connecting blocks, and a third spring (56) is connected between two adjacent connecting blocks. When the weight of the heavy object is within a set value, the connecting plate (52) is rotated to move the anti-sway parts (53) away from each other, the telescopic sleeve (55) and the third spring (56) are stretched, and the heavy object is lifted to a certain height so that the hook is located between the anti-sway parts (53). Thereafter, the connecting plate (52) is released, the telescopic sleeve (55) is restored, and the third spring (56) rebounds, so that the anti-sway parts (53) are close to each other to clamp the hook.

5. The overload protection electric hoist according to claim 4, characterized in that: The anti-sway parts (53) are all arc-shaped.

6. The overload protection electric hoist according to claim 4, characterized in that: The invention also comprises a stabilizing mechanism (6), which comprises a fourth fixed plate (61), a mounting seat (62), a rotating plate (63), a second roller (64) and a first torsion spring (65). The front and rear sides of the upper part of the second fixed plate (33) are connected to the fourth fixed plate (61), the upper side of the fourth fixed plate (61) is connected to the mounting seat (62), the mounting seat (62) is rotatably connected to the rotating plate (63), the upper part of the rotating plate (63) is rotatably connected to the second roller (64), and the first torsion spring (65) is connected between the rotating plate (63) and the connected mounting seat (62). The second roller (64) on the rotating plate (63) is always kept in contact with the upper side of the track by the action force of the first torsion spring (65). When the second fixed plate (33) moves, the second roller (64) rotates and moves on the track.

7. The overload protection electric hoist according to claim 6, characterized in that: The electric hoist (1) also includes a cooling mechanism (7), which includes a second fixing seat (71), a cooling liquid barrel (72) and a nozzle (73). The second fixing seat (71) is connected to the left side of the upper part of the electric hoist (1), the cooling liquid barrel (72) is connected to the upper side of the second fixing seat (71), and the cooling liquid barrel (72) is connected to the nozzle (73) on both the front and rear sides. When the first friction disk (47) rotates, cooling liquid is introduced into the cooling liquid barrel (72), so that the nozzle (73) sprays the cooling liquid between the first friction disk (47) and the second friction disk (49).

8. The overload protection electric hoist according to claim 7, characterized in that: The nozzles (73) are all made of flexible material.

9. The overload protection electric hoist according to claim 7, characterized in that: The nozzles (73) are each provided with nozzles.

10. The overload protection electric hoist according to claim 7, characterized in that: The device also comprises a buffer mechanism (8), the buffer mechanism (8) comprising a fixing member (81), a connecting rod (82), a second torsion spring (83) and a limiting wheel (84); two fixing members (81) on the left and right sides of the lower part of the anti-sway member (53) are connected to the sides away from each other; a connecting rod (82) is rotatably connected between two adjacent fixing members (81); a second torsion spring (83) is connected between the fixing members (81) and the connecting rod (82) connected thereto; and the limiting wheel (84) is rotatably connected to the lower part of the connecting rod (82); after a heavy object is hung on the hook, the limiting wheels (84) on the connecting rod (82) are brought into contact with each other through the action of the second torsion spring (83) to clamp the hanging rope of the heavy object.

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