Electric hoist

Abstract

The invention provides an electric hoist, and relates to the technical field of hoists. The electric hoist comprises a cross beam, a suspension device, a driving motor, a winding drum, a cable, a control handle, a steel rope and a hook. The first chain serves as a main chain, the second chain serves as a standby chain, the tensioning force of the first chain can be dynamically detected and adjusted in real time by arranging the tensioning force detection structure and the tensioning force adjusting structure, and when the adjusting frequency of the tensioning force adjusting structure reaches a set value, warning information can be sent out through a buzzer and an alarm lamp; when the first chain is broken in the hoisting process, the controller immediately controls the clutch structure to be powered on except for continuously sending out warning information through the buzzer and the alarm lamp, so that the second chain and the two groups of second chain wheels are started, smooth hoisting operation is guaranteed, and the machine is selected to be maintained after the hoisting operation is completed. And the production efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric hoists, and particularly to an electric hoist. Background Art

[0002] Electric hoists have the advantages of compact structure, light weight, small volume, strong universality of components, convenient operation, etc., and are widely used in loading and unloading heavy objects, mechanical welding, installation and movement of mechanical equipment, etc. In the prior art, electric hoists basically adopt a single rail or require two drums to wind the steel wire ropes to achieve the lifting of two steel wire ropes. The heavy objects lifted by the electric hoist with a single rail are prone to shaking, reducing the safety factor. While the electric hoist with two drums increases the structure of the equipment, the volume increases, and the weight increases. Therefore, there is a disclosed technology that proposes a wire rope electric hoist (Chinese Patent Publication No. CN110271989B). This wire rope electric hoist includes a box body, a hoisting mechanism, a guide, and a driving part; the hoisting mechanism includes a wire rope drum, a hoisting wire rope is wound around the wire rope drum, a hook pulley group and a hook are provided on the wire rope, a wire rope fixing component fixed on one side of the box body, a hanging component fixed on the other side of the box body, bearings fixed at both ends of the wire rope drum, a fixed shaft passing through the bearings and the wire rope drum and provided on the box body, and fixing screws provided at both ends of the fixed shaft. This disclosed technology has a reasonable structure, a high safety guarantee coefficient, and anti-shaking; In the prior art including the above-mentioned disclosed technology, an emergency braking structure is usually designed for the failure of the braking system, but there is no special design for the transmission chain. Only regular maintenance is used to inspect and maintain the chain, and it is difficult to detect the hidden danger of chain fracture. Once the chain breaks during the hoisting process, the hoisting operation cannot continue, and it is necessary to stop the machine for replacement, affecting the production efficiency. Therefore, it is necessary to improve and optimize the structure of the electric hoist to solve the above problems. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides an electric hoist, which solves the problem that the existing electric hoist cannot continue hoisting after the chain breaks.

[0004] To achieve the above object, the present invention is realized through the following technical solutions: An electric hoist includes a cross beam, a suspension device, a driving motor, a winding drum, a cable, a control handle, a steel rope, and a hook. The suspension device is slidably connected to the lower wall of the cross beam. The lower wall of the suspension device is fixedly connected to a main housing through a fixing frame. The winding drum is rotatably connected to the inner side wall of the main housing through a rotating shaft. The steel rope is wound around the outer wall of the winding drum, and one end of the steel rope is fixedly connected to the outer wall of the winding drum. The hook is fixedly connected to the end of the steel rope away from the winding drum. A controller is fixedly connected to the front wall of the suspension device. The cable is fixedly connected to the side wall of the controller. The control handle is fixedly connected to the end of the cable away from the controller. A heat dissipation housing is fixedly connected to the front wall of the main housing. A driving box is fixedly connected to the rear wall of the main housing. The driving motor is fixedly connected to the upper inner wall of the driving box through a fixing seat. A transmission device for connecting the driving motor and the rotating shaft is provided inside the driving box.

[0005] Preferably, the transmission device includes two groups of first sprockets, second sprockets, and two groups of transmission shafts. The rear end of the rotating shaft sequentially penetrates the rear wall of the main housing and the front wall of the driving box and extends into the interior of the driving box. One group of the two groups of transmission shafts is fixedly connected to the end of the extending shaft of the driving motor and the end of the rotating shaft extending into the driving box through a coupling respectively. One group of the two groups of transmission shafts connected to the driving motor is rotatably connected to the front inner wall of the driving box through a rotating seat at the end away from the driving motor. One group of the two groups of transmission shafts connected to the rotating shaft is rotatably connected to the lower inner wall of the driving box through a support seat at the end away from the rotating shaft. The two groups of first sprockets are respectively rotatably connected to the outer wall of one group of transmission shafts. The two groups of second sprockets are respectively rotatably connected to the outer wall of one group of transmission shafts and are both located in front of the first sprockets. A first chain is commonly sleeved on the outer walls of the two groups of first sprockets. A second chain is commonly sleeved on the outer walls of the two groups of second sprockets. A tension detection structure for detecting the tension of the first chain is provided on the right inner wall of the driving box. A tension adjustment structure for adjusting the tension of the first chain is provided on the left inner wall of the driving box. The inner side wall of the second sprocket is fixedly connected to an outer housing. The inner side wall of the outer housing is rotatably connected to an inner housing. The inner side wall of the inner housing is fixedly connected to the outer wall of the transmission shaft. A clutch structure for controlling the clutch state between the second sprocket and the transmission shaft is provided between the outer housing and the inner housing. A rotating power supply structure for supplying power to the clutch structure during rotation is provided on the outer wall of the transmission shaft and behind the inner housing. A heat dissipation structure for dissipating heat from the clutch structure is provided on the right wall of the driving box. An alarm structure for sending out warning information is provided on the left wall of the driving box.

[0006] Preferably, the tension detection structure includes a second sliding tube, a second slider, a second roller, and a displacement sensor. The second sliding tube is fixedly connected to the right inner wall of the drive box. A push block is slidably connected to the inner side wall of the second sliding tube. The second slider is fixedly connected to the left wall of the push block. One end of the second slider away from the push block penetrates through the left wall of the second sliding tube and extends to the left side of the second sliding tube. The second roller is rotatably connected to the end of the second slider away from the push block. The outer circumferential wall of the second roller is in rolling connection with the outer wall of the first chain. A spring is arranged between the side of the push block away from the second slider and the right inner wall of the drive box.

[0007] Preferably, the displacement sensor is fixedly connected to the upper wall of the second sliding tube. A through groove penetrating up and down is arranged on the upper wall of the second sliding tube. A connecting strip is fixedly connected to the upper wall of the push block. One end of the connecting strip away from the push block penetrates through the through groove and is fixedly connected to the detection slider of the displacement sensor. The displacement sensor is electrically connected to the controller.

[0008] Preferably, the tension adjustment structure includes a first sliding tube, a first slider, a first roller, and an electric telescopic rod. The first sliding tube is fixedly connected to the left inner wall of the drive box. The first slider is slidably connected to the inner side wall of the first sliding tube and the right end of the first slider penetrates through the right wall of the first sliding tube. The electric telescopic rod is fixedly connected between the left inner wall of the drive box and the first slider. The first roller is rotatably connected to the end of the first slider away from the electric telescopic rod. The outer circumferential wall of the first roller is in rolling connection with the outer wall of the first chain. The electric telescopic rod is electrically connected to the controller.

[0009] Preferably, the clutch structure includes an electromagnetic coil and a magnetic powder pack. The electromagnetic coil is arranged between the inner housing and the outer housing. The magnetic powder pack is arranged between the electromagnetic coil and the inner housing and between the electromagnetic coil and the outer housing. The magnetic powder pack is composed of a plurality of iron-cobalt-based alloy magnetic powder particles. The clutch structure makes the magnetic powder pack solidify by energizing the electromagnetic coil to realize the transmission connection between the outer housing and the inner housing.

[0010] Preferably, a plurality of first grooves are arranged on the inner side wall of the outer housing. The plurality of first grooves are evenly distributed in a circumferential manner centered on the axis of the outer housing. A plurality of second grooves are arranged on the outer circumferential wall of the inner housing. The plurality of second grooves are evenly distributed in a circumferential manner centered on the axis of the inner housing.

[0011] Preferably, the rotary power supply structure includes a fixed slip ring and a moving slip ring. The fixed slip ring is sleeved on the outer wall of the transmission shaft and is fixedly connected to the inner side wall of the drive box through a bracket. The moving slip ring is fixedly connected to the outer wall of the transmission shaft and is rotatably connected to the fixed slip ring. The moving slip ring is electrically connected to the fixed slip ring and the clutch structure.

[0012] Preferably, the heat dissipation structure includes two groups of heat dissipation windows, both of which are fixedly connected to the right wall of the drive box and are distributed vertically. The two groups of heat dissipation windows correspond to the positions of the two transmission shafts respectively.

[0013] Preferably, the alarm structure includes an alarm lamp and a buzzer. The alarm lamp and the buzzer are both fixedly connected to the left wall of the drive box and are distributed front and back. The alarm lamp and the buzzer are both electrically connected to the controller.

[0014] The present invention provides an electric hoist, which has the following beneficial effects: Compared with the prior art, in this electric hoist, the first chain serves as the main chain and the second chain serves as the spare chain. By setting the tension detection structure and the tension adjustment structure, the tension of the first chain can be dynamically and real-time detected and adjusted to ensure the transmission between the two first sprockets. When the adjustment times of the tension adjustment structure for adjusting the tension of the first chain reach the set value, a warning message can be sent through the buzzer and the alarm lamp to remind the staff to pay attention and improve the operation safety.

[0015] Compared with the prior art, in this electric hoist, when the first chain breaks during the hoisting process, in addition to continuously sending a warning message through the buzzer and the alarm lamp, the controller immediately controls the clutch structure to be powered on, thereby enabling the second chain and the two second sprockets to ensure that the drive motor can still drive the winding drum to perform the winding work, ensuring the smooth progress of the hoisting operation, and then repairing it at an opportune time after the hoisting operation is completed, effectively improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic plan view of the present invention; Figure 2 is a schematic three-dimensional view of the present invention; Figure 3 is a schematic side view of the connection structure of the fixing frame, the main housing, the drive box and the heat dissipation housing of the present invention; Figure 4 is a partial side sectional view of the internal structure of the drive box of the present invention; Figure 5 For the present invention Figure 4 is a partial enlarged view at B in; Figure 6 is a sectional view of the connection structure of the transmission shaft, the inner housing and the outer housing of the present invention; Figure 7 is a sectional view of the outer housing of the present invention; Figure 8 is a sectional view of the inner housing of the present invention; Figure 9 is a partial sectional view of the internal structure of the drive box of the present invention; Figure 10For the present invention Figure 9 Partial enlarged view at position C in the present invention; Figure 11 For the present invention Figure 1 Partial enlarged view at position A in the present invention; Figure 12 Schematic plan view of the mounting block in the present invention; Wherein, 1, cross beam; 2, suspension device; 3, controller; 4, cable; 5, control handle; 6, fixing bracket; 7, main housing; 8, heat dissipation housing; 9, steel rope; 10, hook; 11, drive box; 12, buzzer; 13, warning light; 14, fixing seat; 15, drive motor; 16, coupling; 17, winding drum; 18, rotating shaft; 19, support seat; 20, first chain; 21, second chain; 22, transmission shaft; 23, first sprocket; 24, second sprocket; 25, fixed slip ring; 26, moving slip ring; 27, outer housing; 2701, first groove; 28, inner housing; 2801, second groove; 29, electromagnetic coil; 30, magnetic powder package; 31, heat dissipation window; 32, first sliding tube; 33, first slider; 34, first roller; 35, electric telescopic rod; 36, second sliding tube; 37, spring; 38, push block; 39, second slider; 40, second roller; 41, displacement sensor; 42, connecting bar; 43, abutting block; 44, connecting ear; 45, auxiliary wheel; 46, L-shaped part; 47, limiting block; 48, U-shaped part; 48a, switching part; 48b, limiting part; 49, mounting block; 50, travel switch; 51, locking screw; 52, adjusting rod; 53, guide seat. Detailed implementation manners

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0018] As Figures 1 to 12As shown in the figure, an embodiment of the present invention provides an electric hoist, which includes a cross beam 1, a suspension device 2, a driving motor 15, a winding drum 17, a cable 4, a control handle 5, a steel wire rope 9 and a hook 10. The suspension device 2 is slidably connected to the lower wall of the cross beam 1. The lower wall of the suspension device 2 is fixedly connected to a main housing 7 through a fixing frame 6. The winding drum 17 is rotatably connected to the inner side wall of the main housing 7 through a rotating shaft 18. The steel wire rope 9 is wound around the outer wall of the winding drum 17 and one end of the steel wire rope 9 is fixedly connected to the outer wall of the winding drum 17. The hook 10 is fixedly connected to the end of the steel wire rope 9 away from the winding drum 17. The front wall of the suspension device 2 is fixedly connected to a controller 3. The cable 4 is fixedly connected to the side wall of the controller 3. The control handle 5 is fixedly connected to the end of the cable 4 away from the controller 3. The front wall of the main housing 7 is fixedly connected to a heat dissipation housing 8. The rear wall of the main housing 7 is fixedly connected to a driving box 11. The driving motor 15 is fixedly connected to the upper wall inside the driving box 11 through a fixing seat 14. A transmission device for connecting the driving motor 15 and the rotating shaft 18 is provided inside the driving box 11. In this embodiment, the connection between the suspension device 2 and the cross beam 1 and the structure of the winding drum 17 driving the steel wire rope 9 are both consistent with the existing structures, and will not be elaborated here.

[0019] In order to ensure the smooth progress of the hoisting operation, the transmission device includes two groups of first sprockets 23, second sprockets 24 and two groups of transmission shafts 22. The rear end of the rotating shaft 18 sequentially penetrates the rear wall of the main housing 7 and the front wall of the driving box 11 and extends into the driving box 11. The two groups of transmission shafts 22 are respectively fixedly connected to the end of the protruding shaft of the driving motor 15 and the end of the rotating shaft 18 extending into the driving box 11 through a group of couplings 16. One of the two groups of transmission shafts 22 connected to the driving motor 15 is rotatably connected to the front wall inside the driving box 11 through a rotating seat at the end away from the driving motor 15. One of the two groups of transmission shafts 22 connected to the rotating shaft 18 is rotatably connected to the lower wall inside the driving box 11 through a support seat 19 at the end away from the rotating shaft 18. The two groups of first sprockets 23 are respectively rotatably connected to the outer wall of a group of transmission shafts 22. The two groups of second sprockets 24 are respectively rotatably connected to the outer wall of a group of transmission shafts 22 and are both located in front of the first sprockets 23. A first chain 20 is sleeved on the outer walls of the two groups of first sprockets 23. A second chain 21 is sleeved on the outer walls of the two groups of second sprockets 24. The first chain 20 is the main chain and plays a main transmission role. The second chain 21 is a spare chain and maintains the transmission connection between the driving motor 15 and the rotating shaft 18 after the first chain 20 breaks; In order to detect the tension of the first chain 20 in real time, a tension detection structure for detecting the tension of the first chain 20 is provided on the inner right wall of the drive box 11. The tension detection structure includes a second sliding tube 36, a second slider 39, a second roller 40 and a displacement sensor 41. The second sliding tube 36 is fixedly connected to the inner right wall of the drive box 11. A push block 38 is slidably connected to the inner wall of the second sliding tube 36. The second slider 39 is fixedly connected to the left wall of the push block 38. One end of the second slider 39 away from the push block 38 penetrates the left wall of the second sliding tube 36 and extends to the left side of the second sliding tube 36. The second roller 40 is rotatably connected to one end of the second slider 39 away from the push block 38. The outer circumference of the second roller 40 is in rolling connection with the outer wall of the first chain 20. A spring 37 is provided between the side of the push block 38 away from the second slider 39 and the inner right wall of the drive box 11. The displacement sensor 41 is fixedly connected to the upper wall of the second sliding tube 36. A through groove that penetrates up and down is provided on the upper wall of the second sliding tube 36. A connecting bar 42 is fixedly connected to the upper wall of the push block 38. One end of the connecting bar 42 away from the push block 38 penetrates the through groove and is fixedly connected to the detection slider of the displacement sensor 41. The displacement sensor 41 is electrically connected to the controller 3. During daily operation, the spring 37 pushes the push block 38 and the second slider 39, driving the second roller 40 to abut against the outer wall of the first chain 20. When the first chain 20 becomes slack, the elastic force of the spring 37 drives the second slider 39 to extend further. During this movement, the detection slider on the displacement sensor 41 is driven by the connecting bar 42, so that the displacement sensor 41 generates a displacement signal. After the receiving end of the controller 3 receives the displacement signal, it controls the tension adjustment structure to adjust the tension of the first chain 20. When the first chain 20 breaks, the detection slider of the displacement sensor 41 is pushed by the spring 37, instantly generating a displacement signal with a large displacement, and then controlling the clutch structure to act through the controller 3; In order to dynamically adjust the tension of the first chain 20, a tension adjustment structure for adjusting the tension of the first chain 20 is provided on the inner left wall of the drive box 11. The tension adjustment structure includes a first sliding tube 32, a first slider 33, a first roller 34 and an electric telescopic rod 35. The first sliding tube 32 is fixedly connected to the inner left wall of the drive box 11. The first slider 33 is slidably connected to the inner wall of the first sliding tube 32 and the right end of the first slider 33 penetrates the right wall of the first sliding tube 32. The electric telescopic rod 35 is fixedly connected between the inner left wall of the drive box 11 and the first slider 33. The first roller 34 is rotatably connected to one end of the first slider 33 away from the electric telescopic rod 35. The outer circumference of the first roller 34 is in rolling connection with the outer wall of the first chain 20. The electric telescopic rod 35 is electrically connected to the controller 3. After the displacement sensor 41 detects that the first chain 20 is slack, according to the detected slack amount, the controller 3 controls the extension shaft of the electric telescopic rod 35 to extend, driving the first slider 33 and the first roller 34 to squeeze the first chain 20, so that the first chain 20 returns to the taut state again, ensuring normal transmission; To control the engagement and disengagement between the second sprocket 24 and the transmission shaft 22, a housing 27 is fixedly connected to the inner side wall of the second sprocket 24. An inner housing 28 is rotatably connected to the inner side wall of the housing 27. The outer wall of the transmission shaft 22 is fixedly connected to the inner side wall of the inner housing 28. A clutch structure for controlling the engagement and disengagement state between the second sprocket 24 and the transmission shaft 22 is provided between the housing 27 and the inner housing 28. The clutch structure includes an electromagnetic coil 29 and a magnetic powder pack 30. The electromagnetic coil 29 is arranged between the inner housing 28 and the housing 27. The magnetic powder pack 30 is arranged between the electromagnetic coil 29 and the inner housing 28 and between the electromagnetic coil 29 and the housing 27. The magnetic powder pack 30 is composed of a plurality of iron-cobalt-based alloy magnetic powder particles. The clutch structure makes the magnetic powder pack 30 solidify by energizing the electromagnetic coil 29, realizing the transmission connection between the housing 27 and the inner housing 28. A plurality of first grooves 2701 are arranged on the inner side wall of the housing 27. The plurality of first grooves 2701 are circumferentially equally distributed centered on the axis of the housing 27. A plurality of second grooves 2801 are arranged on the circumferential outer wall of the inner housing 28. The plurality of second grooves 2801 are circumferentially equally distributed centered on the axis of the inner housing 28. When the first chain 20 is operating normally, the electromagnetic coil 29 is in a de-energized state, and the magnetic powder particles in the magnetic powder pack 30 are in a loose state. The housing 27 and the inner housing 28 are in a rotatable state, that is, the transmission shaft 22 is not driven by the second chain 21. When the first chain 20 breaks, the controller 3 controls the electromagnetic coil 29 to be energized to generate a magnetic field. The magnetic powder particles in the magnetic powder pack 30 are magnetized and solidified. A magnetic powder bonding structure is formed by the magnetic powder filled in the first grooves 2701 and the second grooves 2801, making the housing 27 and the inner housing 28 in a fixed state. At this time, the two transmission shafts 22 are driven by the second chain 21 and the two second sprockets 24, ensuring the continuous progress of the hoisting; To supply power to the clutch structure during rotation, a rotary power supply structure for supplying power to the clutch structure during rotation is arranged on the outer wall of the transmission shaft 22 and behind the inner housing 28. The rotary power supply structure includes a fixed slip ring 25 and a moving slip ring 26. The fixed slip ring 25 is sleeved on the outer wall of the transmission shaft 22 and is fixedly connected to the inner side wall of the drive box 11 through a bracket. The moving slip ring 26 is fixedly connected to the outer wall of the transmission shaft 22 and is rotatably connected to the fixed slip ring 25. The moving slip ring 26 is electrically connected to the fixed slip ring 25 and the clutch structure. The electromagnetic coil 29 in the clutch structure is powered during rotation through the fixed slip ring 25 and the moving slip ring 26, ensuring the smooth operation of the clutch structure; To ensure that the heat generated during the operation of the clutch structure can be discharged smoothly, a heat dissipation structure for the clutch structure is provided on the right wall of the drive box 11. The heat dissipation structure includes two groups of heat dissipation windows 31. The two groups of heat dissipation windows 31 are both fixedly connected to the right wall of the drive box 11 and are distributed vertically. The two groups of heat dissipation windows 31 correspond to the positions of the two groups of transmission shafts 22 respectively, and the two groups of heat dissipation windows 31 correspond to the two groups of outer shells 27 respectively. During the operation of the clutch structure, the heat can be discharged smoothly through the two groups of heat dissipation windows 31, avoiding the high-temperature failure of the clutch structure; To send a warning message when the tension detection structure detects a specific situation, an alarm structure for sending a warning message is provided on the left wall of the drive box 11. The alarm structure includes an alarm lamp 13 and a buzzer 12. The alarm lamp 13 and the buzzer 12 are both fixedly connected to the left wall of the drive box 11 and are distributed front and back. The alarm lamp 13 and the buzzer 12 are both electrically connected to the controller 3. The alarm structure has two warning modes and can be reminded by emitting different lights through the alarm lamp 13. The alarm lamp 13 can be a common LED lamp with different colors on the market. When the number of times the controller 3 controls the electric telescopic rod 35 to extend reaches the set value, the alarm structure sends the first warning message to remind that the tension of the first chain 20 has been adjusted to the limit. When the displacement sensor 41 detects that the first chain 20 is broken, the alarm structure sends the second warning message.

[0020] Specifically: At both ends of the cross beam 1, abutting blocks 43 are connected through fasteners. On both sides of the suspension device 2, there are also connecting ears 44. One end of an L-shaped member 46 is rotatably connected to the connecting ear 44 through a rotating shaft 18. There is also a return torsion spring between the rotating shaft 18 and the connecting ear 44. In this embodiment, the return torsion spring can be used to make the long dry section of the L-shaped member 46 in a horizontal state. A limit block 47 that cooperates with the L-shaped member 46 is also installed on the connecting ear 44. An auxiliary wheel 45 is installed at the other end of the L-shaped member 46. At both ends of the cross beam 1, mounting blocks 49 are also connected, and the mounting blocks 49 are located above the abutting blocks 43. A U-shaped member 48 is installed on the mounting block 49. One end of the U-shaped member 48 has a switching portion 48a arranged obliquely, and the other end of the U-shaped member 48 has a limiting portion 48b arranged obliquely. A guide seat 53 is installed in the middle of the U-shaped member 48. A locking screw 51 is threadedly connected to the guide seat 53. An adjusting rod 52 is vertically slidably connected to the guide seat 53. A travel switch 50 that cooperates with the auxiliary wheel 45 is connected to the adjusting rod 52. The travel switch 50 is electrically connected to the control handle 5. In order to ensure that the electric hoist can stop stably after moving left and right to the specified position, movable L-shaped members 46 are installed on both sides of the suspension device 2. When the suspension device 2 reaches the left and right extreme positions, under the combined action of the switching portion 48a and the limiting portion 48b, the auxiliary wheel 45 guides the L-shaped member 46 to smoothly transition from the horizontal position to the vertical state. At this time, the guide wheel contacts the travel switch 50, and a signal is immediately transmitted to the control handle 5. Since the distance of each contact between the guide wheel and the travel switch 50 remains the same, excessive impact on the travel switch 50 is avoided. Even after long-term use, when the abutting block 43 becomes loose and moves outward, the guide wheel can still contact the travel switch 50, ensuring the stability and reliability of the in-place detection.

[0021] Working principle: The first chain 20 is the main chain and plays a main driving role. The second chain 21 is the spare chain, which maintains the transmission connection between the driving motor 15 and the rotating shaft 18 after the first chain 20 breaks. During daily operation, the spring 37 pushes the push block 38 and the second slider 39, driving the second roller 40 to abut against the outer wall of the first chain 20. When the first chain 20 becomes loose, the elastic force of the spring 37 drives the second slider 39 to extend further. During this movement, the detection slider on the displacement sensor 41 is driven by the connecting bar 42, so that the displacement sensor 41 generates a displacement signal. After the receiving end of the controller 3 receives the displacement signal, it controls the tension adjustment structure to adjust the tension of the first chain 20. When the first chain 20 breaks, the detection slider of the displacement sensor 41 instantaneously generates a displacement signal with a large displacement under the push of the spring 37, and then controls the clutch structure to act through the controller 3. The electric telescopic rod 35 is electrically connected to the controller 3. After the displacement sensor 41 detects that the first chain 20 is loose, according to the detected amount of slack, the controller 3 controls the extending shaft of the electric telescopic rod 35 to extend, driving the first slider 33 and the first roller 34 to squeeze the first chain 20, so that the first chain 20 returns to the taut state again, ensuring normal transmission. When the first chain 20 is operating normally, the electromagnetic coil 29 is in a power-off state, and the magnetic powder particles in the magnetic powder package 30 are in a loose state. The outer shell 27 and the inner shell 28 are in a rotatable state, that is, the transmission shaft 22 is not driven by the second chain 21. When the first chain 20 breaks, the controller 3 controls the electromagnetic coil 29 to be energized to generate magnetism, and the magnetic powder particles in the magnetic powder package 30 are magnetically cured. A magnetic powder bonding structure is formed through the magnetic powder filled in the first groove 2701 and the second groove 2801, so that a fixed state is formed between the outer shell 27 and the inner shell 28. At this time, the two transmission shafts 22 are driven by the second chain 21 and the two second sprockets 24, ensuring the continuation of the hoisting. The fixed slip ring 25 and the moving slip ring 26 supply power to the electromagnetic coil 29 in the clutch structure during rotation, ensuring that the clutch structure can act smoothly. The two heat dissipation windows 31 correspond to the positions of the two outer shells 27 respectively. During the operation of the clutch structure, the two heat dissipation windows 31 ensure that heat can be discharged smoothly, avoiding the high-temperature failure of the clutch structure. The alarm structure has two warning modes and can be reminded by emitting different lights through the alarm lamp 13. The alarm lamp 13 can be a common LED lamp with different colors on the market. When the number of times the controller 3 controls the electric telescopic rod 35 to extend reaches the set value, the alarm structure issues the first warning message, reminding that the tension of the first chain 20 has been adjusted to the limit. When the displacement sensor 41 finds that the first chain 20 breaks, the alarm structure issues the second warning message.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric hoist, characterized in that: The invention comprises a crossbeam (1), a suspension device (2), a drive motor (15), a winding drum (17), a cable (4), a control handle (5), a steel rope (9) and a hook (10), wherein the suspension device (2) is slidably connected to the lower wall of the crossbeam (1), the lower wall of the suspension device (2) is fixedly connected to a main housing (7) via a fixing frame (6), the winding drum (17) is rotatably connected to the inner wall of the main housing (7) via a rotating shaft (18), the steel rope (9) is wound around the outer wall of the winding drum (17) and one end of the steel rope (9) is fixedly connected to the outer wall of the winding drum (17), and the hook (10) is fixedly connected to the far end of the steel rope (9). The controller (3) is fixedly connected to the front wall of the suspension device (2), the cable (4) is fixedly connected to the side wall of the controller (3), the control handle (5) is fixedly connected to the end of the cable (4) away from the controller (3), the front wall of the main shell (7) is fixedly connected to the heat dissipation shell (8), the rear wall of the main shell (7) is fixedly connected to the drive box (11), the drive motor (15) is fixedly connected to the inner upper wall of the drive box (11) through a fixing seat (14), and a transmission device for connecting the drive motor (15) and the rotating shaft (18) is arranged inside the drive box (11).

2. An electric hoist according to claim 1, characterized in that: The transmission device comprises two sets of first sprockets (23), second sprockets (24) and two sets of transmission shafts (22); the rear end of the rotating shaft (18) sequentially passes through the rear wall of the main housing (7) and the front wall of the driving box (11) and extends into the interior of the driving box (11); the two sets of transmission shafts (22) are respectively fixedly connected to the protruding shaft end of the driving motor (15) and one end of the rotating shaft (18) extending into the interior of the driving box (11) through a set of couplings (16); one of the two sets of transmission shafts (22) connected to the driving motor (15) is away from the One end of the driving motor (15) is rotatably connected to the inner front wall of the driving box (11) through a rotating seat; one end of the two sets of transmission shafts (22) connected to the rotating shaft (18) and away from the rotating shaft (18) is rotatably connected to the inner lower wall of the driving box (11) through a supporting seat (19); the two sets of the first sprockets (23) are respectively rotatably connected to the outer wall of one set of transmission shafts (22); the two sets of the second sprockets (24) are respectively rotatably connected to the outer wall of one set of transmission shafts (22) and are both located in front of the first sprockets (23); the two sets of the first sprockets (24) are respectively rotatably connected to the outer wall of one set of transmission shafts (22) and are both located in front of the first sprockets (23); 3) The outer walls are commonly sleeved with a first chain (20), the outer walls of the two sets of the second sprockets (24) are commonly sleeved with a second chain (21), the inner right wall of the drive box (11) is provided with a tension detection structure for detecting the tension of the first chain (20), the inner left wall of the drive box (11) is provided with a tension adjustment structure for adjusting the tension of the first chain (20), the inner wall of the second sprocket (24) is fixedly connected to an outer shell (27), the inner wall of the outer shell (27) is rotatably connected to an inner shell (28), and the The inner wall of the inner shell (28) is fixedly connected to the outer wall of the transmission shaft (22); a clutch structure for controlling the clutch state between the second sprocket (24) and the transmission shaft (22) is provided between the outer shell (27) and the inner shell (28); a rotating power supply structure for supplying power to the clutch structure during rotation is provided on the outer wall of the transmission shaft (22) and located at the rear side of the inner shell (28); a heat dissipation structure for dissipating heat from the clutch structure is provided on the right wall of the drive box (11); and an alarm structure for issuing a warning message is provided on the left wall of the drive box (11).

3. An electric hoist according to claim 2, characterized in that: The tension force detection structure comprises a second sliding tube (36), a second slider (39), a second roller (40) and a displacement sensor (41); the second sliding tube (36) is fixedly connected to the inner right wall of the driving box (11); a push block (38) is slidably connected to the inner wall of the second sliding tube (36); the second slider (39) is fixedly connected to the left wall of the push block (38); an end of the second slider (39) away from the push block (38) passes through the left wall of the second sliding tube (36) and extends to the left side of the second sliding tube (36); the second roller (40) is rotatably connected to an end of the second slider (39) away from the push block (38); a circumferential outer wall of the second roller (40) is rollingly connected to an outer wall of the first chain (20); and a spring (37) is provided between a side of the push block (38) away from the second slider (39) and the inner right wall of the driving box (11).

4. An electric hoist according to claim 3, characterized in that: The displacement sensor (41) is fixedly connected to the upper wall of the second sliding tube (36); the upper wall of the second sliding tube (36) is provided with a through groove which passes through from top to bottom; the upper wall of the push block (38) is fixedly connected to a connecting strip (42); one end of the connecting strip (42) away from the push block (38) passes through the through groove and is fixedly connected to a detection slider of the displacement sensor (41); and the displacement sensor (41) is electrically connected to the controller (3).

5. An electric hoist according to claim 4, characterized in that: The tensioning force adjustment structure comprises a first sliding tube (32), a first slider (33), a first roller (34) and an electric telescopic rod (35); the first sliding tube (32) is fixedly connected to the inner left wall of the driving box (11); the first slider (33) is slidably connected to the inner wall of the first sliding tube (32) and the right end of the first slider (33) passes through the right wall of the first sliding tube (32); the electric telescopic rod (35) is fixedly connected between the inner left wall of the driving box (11) and the first slider (33); the first roller (34) is rotatably connected to an end of the first slider (33) away from the electric telescopic rod (35); the circumferential outer wall of the first roller (34) is rollingly connected to the outer wall of the first chain (20); and the electric telescopic rod (35) is electrically connected to the controller (3).

6. An electric hoist according to claim 5, characterized in that: The clutch structure comprises an electromagnetic coil (29) and a magnetic powder bag (30); the electromagnetic coil (29) is arranged between an inner shell (28) and an outer shell (27); the magnetic powder bag (30) is arranged between the electromagnetic coil (29) and the inner shell (28) and between the electromagnetic coil (29) and the outer shell (27); the magnetic powder bag (30) is composed of a plurality of iron-cobalt-based alloy magnetic powder particles; the clutch structure solidifies the magnetic powder bag (30) by energizing the electromagnetic coil (29), thereby realizing a transmission connection between the outer shell (27) and the inner shell (28).

7. An electric hoist according to claim 6, characterized in that: The inner side wall of the outer shell (27) is provided with a plurality of groups of first grooves (2701), and the plurality of groups of first grooves (2701) are equally distributed in a circle with the axis of the outer shell (27) as the center. The outer side wall of the inner shell (28) is provided with a plurality of groups of second grooves (2801), and the plurality of groups of second grooves (2801) are equally distributed in a circle with the axis of the inner shell (28) as the center.

8. An electric hoist according to claim 7, characterized in that: The rotating power supply structure comprises a fixed slip ring (25) and a movable slip ring (26); the fixed slip ring (25) is sleeved on the outer wall of the transmission shaft (22) and fixedly connected to the inner wall of the drive box (11) via a bracket; the movable slip ring (26) is fixedly connected to the outer wall of the transmission shaft (22) and rotationally connected to the fixed slip ring (25); the movable slip ring (26) is electrically connected to the fixed slip ring (25) and the clutch structure.

9. An electric hoist according to claim 8, characterized in that: The heat dissipation structure comprises two groups of heat dissipation windows (31), the two groups of heat dissipation windows (31) are fixedly connected to the right wall of the drive box (11) and are distributed up and down, and the two groups of heat dissipation windows (31) correspond to the positions of the two groups of transmission shafts (22) respectively.

10. An electric hoist according to claim 9, characterized in that: The alarm structure comprises an alarm light (13) and a buzzer (12); the alarm light (13) and the buzzer (12) are both fixedly connected to the left wall of the drive box (11) and are distributed frontward and rearward; and the alarm light (13) and the buzzer (12) are both electrically connected to the controller (3).

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