Nuclear power man bridge crane

Abstract

The invention discloses a nuclear power man bridge crane which comprises a man bridge main beam, a winch walking mechanism walks on the man bridge main beam, operation devices are arranged at the left end and the right end of the man bridge main beam, the winch walking mechanism comprises a base, a power source is fixed to the upper end of the base, and a winch drum is rotationally connected to the upper end of the base. Clamping plates are fixed to the front end and the rear end of the winding drum respectively, a middle partition plate is fixed to the winding drum, side partition plates fixedly connected with the winding drum are arranged on the front side and the rear side of the middle partition plate respectively, a stopping mechanism used for stopping the winding drum is arranged on the base and comprises a transmission round rod, and two symmetrically-arranged stopping pieces are arranged on the transmission round rod. After the winding drum rotates quickly, due to the action of centrifugal force, the passive clamping block rotates and is thrown out, the thrown-out passive clamping block is correspondingly clamped with a stop rod on the stop mechanism, and the stop rod abuts against the passive clamping block to prevent the winding drum from rotating and prevent a heavy object from continuing to descend.

Description

Technical Field

[0001] This invention relates to the field of winch technology, specifically to a nuclear power plant overhead crane. Background Technology

[0002] Ring-type cable trays are crucial equipment in nuclear power engineering. During nuclear power plant construction, they are used for hoisting and transporting heavy equipment and components within the reactor building, playing a key role in the construction and subsequent maintenance of the nuclear power plant. Winches are small, lightweight lifting devices that use drums to wind wire ropes or chains to lift or pull heavy objects. Winches can lift vertically and pull horizontally or at an angle. Winches are classified into three types: manual winches, electric winches, and hydraulic winches, with electric winches being the most common. They can be used independently or as components in hoisting, road construction, and mine hoisting machinery. They are widely used due to their simple operation, large rope capacity, and ease of relocation. They are mainly used for material lifting or horizontal dragging in construction, water conservancy projects, forestry, mining, and docks.

[0003] Chinese patent application number CN202120100009.5 discloses a winch pair support structure, a winch device, and a working machine. The winch pair support structure includes a winch support plate, a bearing, and a support shaft. The winch support plate has mounting holes for installing the bearing. The first end of the support shaft passes through the bearing and abuts against the inner ring of the bearing. The support shaft is rotatably connected to the bearing. This utility model provides a winch pair support structure with a winch support plate, bearing, and support shaft. By directly mounting the support shaft inside the winch support plate via the bearing, the bearing seat is eliminated, reducing costs and effectively decreasing the distance between the drum and the winch support plate, improving the stress distribution on the winch support plate, and enhancing the safety of the winch pair support structure.

[0004] Chinese patent application number CN202022359248.0 discloses a winch device and a winch depth measuring device. The winch device includes a winch frame, a drum, a winch rope, and an encoder. The drum is pivotally connected to the winch frame; the winch rope is wound around the drum; the encoder is mounted on the winch frame, and the encoder's input shaft is fixed relative to the drum and rotates with the drum to obtain the number of rotations of the winch rope. This winch depth measuring device includes a winch device. It solves the technical problem of existing depth measuring devices having a large number of sensors, resulting in a complex structure.

[0005] The above solution may encounter the following problems during use: 1. When hoisting heavy objects, the drive motor of the winch may suddenly become weak. At this time, the hoisted object will cause the winch to rotate rapidly and the object will fall. If the brake is not applied quickly, the object will fall to the ground, causing damage to the property or injury to personnel.

[0006] 2. In actual operation of the hoist assembly, when the wire rope is fully wound onto the drum and moved from the first layer to the second layer, the wire rope often piles vertically on the first layer. Sometimes, the next turn of wire rope is even piled directly onto the third layer, preventing smooth rope routing. This phenomenon is called "rope piling." When the rope piles up to a certain extent, the wire rope "jumps" down from the second or third layer, causing a strong impact on the bottom layer of wire rope and severely affecting its service life. Summary of the Invention

[0007] To address the above problems, this invention provides a nuclear power plant personnel crane; it solves the aforementioned problems.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a nuclear power plant personnel bridge crane, comprising a main beam of the personnel bridge, a winch traveling mechanism traveling on the main beam of the personnel bridge, and running devices provided at the left and right ends of the main beam of the personnel bridge. The winch traveling mechanism includes a base, a power source fixed at the upper end of the base, a winch drum rotatably connected to the upper end of the base, locking plates fixed at the front and rear ends of the winch drum, a central partition plate fixed on the winch drum, side partition plates fixedly connected to the winch drum on the front and rear sides of the central partition plate, and a stop mechanism for stopping the winch drum provided on the base.

[0009] Preferably, the stop component includes two fixed seats for connecting the transmission rod and the base. The transmission rod is rotatably connected to the base. A stop rod is provided between the two fixed seats. Two push rods that are slidably connected to the transmission rod are provided on the left side of the stop rod. Compression springs are provided on the outer sides of the two push rods respectively. The compression springs are sleeved on the transmission rod. A gap is provided between the two push rods, and the gap is greater than the thickness of the snap-fit ​​plate.

[0010] Preferably, a locking block and a locking strip are fixed on the transmission rod, a through groove is opened on the top rod, the stop rod is locked with the locking block, the through groove corresponds to the locking strip, and the locking strip prevents the two top rods from getting close.

[0011] Preferably, the stopping component includes two first connecting rods slidably connected to the transmission rod. A gap is provided between the left first connecting rod and the right fixed seat, and the gap is consistent with the thickness of the side partition. Second connecting rods are rotatably connected to the first connecting rods respectively. Compression blocks are rotatably connected to the opposite sides of the two second connecting rods respectively. A pressure rod is provided between the two compression blocks. The compression blocks are composed of a cylinder and a frustum. A tension spring is provided between the first connecting rods and the second connecting rods.

[0012] Preferably, a pressure block is fixed on the opposite side of the two first connecting rods, and a transmission block corresponding to the pressure block is provided between the two first connecting rods. The transmission block is fixedly connected to the transmission rod, and the first connecting rod is moved when the transmission block rotates.

[0013] Preferably, the snap-fit ​​plate has multiple snap-fit ​​slots along its circumference, and the snap-fit ​​slots are snap-fitted into the stop mechanism.

[0014] Preferably, the winch drum has multiple passive locking blocks distributed along its circumference at both its front and rear ends. The passive locking blocks are rotatably connected to the winch drum. The winch drum has a fixed plate that corresponds to each passive locking block. An arc spring is provided between the fixed plate and the passive locking block. The passive locking block is locked in place with the stop mechanism.

[0015] Preferably, a power source is fixed on the base, and a braking system is provided at the output end of the power source. The braking system is fixed on the base, and a reducer is driven to the output end of the power source and fixedly connected to the base. The output end of the reducer is connected to a drive shaft, and the drive shaft is driven to a winch drum through gears. A pulley is fixed on the base.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. After the winch drum starts to rotate rapidly, the passive locking block will rotate due to centrifugal force. The passive locking block will be thrown out and then engage with the stop rod on the stop mechanism. The stop rod will abut against the passive locking block to prevent the winch drum from rotating and to prevent the load from falling further. The passive locking block and the fixing plate are connected by an arc spring. The arc spring pulls the passive locking block to prevent it from opening when the winch drum is working normally, which would cause an unexpected stop.

[0017] 2. The extrusion block is composed of a cylinder and a frustum. Due to the inclined surface of the frustum, when the wire rope climbs from the first layer to the second layer, the component force generated by the rotating surface on the wire rope points in the direction of the second layer of the wire rope. This can reduce or avoid the phenomenon of "rope piling" or "rope skipping" of the wire rope. The tension spring pulls the second connecting rod to apply pressure to the winch drum, and at the same time, apply pressure to the wire rope wound on the winch drum to prevent the wire rope from becoming disordered. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the winch traveling machine of the present invention; Figure 3 This is a schematic diagram of the stopping mechanism of the present invention; Figure 4This is a partially enlarged schematic diagram of the stopping mechanism of the present invention. Figure 1 ; Figure 5 This is a partially enlarged schematic diagram of the stopping mechanism of the present invention. Figure 2 ; Figure 6 This is a partially enlarged schematic diagram of the stopping mechanism of the present invention. Figure 3 ; Figure 7 This is a schematic diagram of the transmission block of the present invention; Figure 8 This is a cross-sectional schematic diagram of the hoisting traveling mechanism of the present invention.

[0019] The diagram shows the following labels: 1. Main beam of the pedestrian bridge; 2. Winch traveling mechanism; 3. Stopping mechanism; 11. Running device; 21. Base; 22. Power source; 23. Braking system; 24. Reducer; 25. Drive shaft; 26. Winch drum; 27. Pulley; 31. Transmission rod; 32. Fixed seat; 33. Stop rod; 34. Top rod; 35. Compression spring; 36. First connecting rod; 37. Second connecting rod; 38. Transmission block; 311. Locking bar; 312. Locking block; 261. Middle partition plate; 262. Side partition plate; 263. Locking plate; 264. Locking groove; 265. Passive locking block; 266. Fixed plate; 267. Arc spring; 341. Through groove; 361. Pressure block; 371. Extrusion block; 372. Pressure rod; 373. Tension spring. Detailed Implementation

[0020] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0021] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4Considering that the drive motor of the winch may sometimes suddenly become weak when lifting heavy objects, the lifted object will cause the winch to rotate rapidly and fall. If there is no quick braking reaction, the object will fall to the ground, causing damage to property or injury to personnel. Therefore, a nuclear power plant personnel bridge crane includes a main beam 1, on which a winch traveling mechanism 2 travels. The lower end of the winch traveling mechanism 2 is equipped with a traveling device to allow the winch traveling mechanism 2 to travel on the main beam 1. The traveling device is powered by an electric motor. The bridge is composed of a machine, reducer, wheels, and other structures. The main beam 1 of the bridge is equipped with a running device 11 at both ends. The running device 11 consists of a motor, brake, coupling, etc., which drives the wheels to rotate, so that the main beam 1 of the bridge runs on the track. Multiple motors are used to drive the bridge to ensure the smoothness and synchronization of the operation. The wheel set is installed on the end beam and is divided into driving wheels and driven wheels. The driving wheels are driven by the driving device, and the driven wheels play a supporting and guiding role. The wheels are in contact with the track, bear the weight of the bridge frame and the heavy objects, and ensure the running accuracy of the bridge frame.

[0022] Please see Figure 2 , Figure 3 , Figure 4 and Figure 6 The hoisting traveling mechanism 2 includes a base 21, with a power source 22 fixed to the upper end of the base 21. A hoisting drum 26 is rotatably connected to the upper end of the base 21. The hoisting drum 26 is used to wind the wire rope. The rotation of the hoisting drum 26 winds up and down the wire rope, thereby raising and lowering the hook to achieve the purpose of lifting and lowering heavy objects. A clamping plate 263 is fixed to the front and rear ends of the hoisting drum 26, and a middle partition plate 261 is fixed to the hoisting drum 26. The middle partition plate 261 divides the hoisting drum 26, allowing the hoisting drum 26 to wind the wire rope in a double-rope configuration. During double-rope winding, the tension of the wire ropes at both ends is symmetrically distributed on both sides of the hoisting drum 26, which can offset part of the radial force. The load is reduced, the bending stress on the shaft of the winch drum 26 is reduced, and the service life of shaft components, bearings and journals is extended. At the same time, when the double ropes are wound, the tension of the wire ropes at both ends restrains each other, which can help guide the wire ropes to be arranged in an orderly manner in the rope groove, reducing the risk of jumping out of the groove due to uneven force on one side. The front and rear sides of the middle partition plate 261 are respectively provided with side partition plates 262 fixedly connected to the winch drum 26. The base 21 is provided with a stop mechanism 3 for stopping the winch drum 26. When the drive motor of the winch device sometimes suddenly becomes weak, the stop mechanism 3 restricts the winch drum 26 to prevent the winch drum 26 from rotating, prevent the heavy object from falling, and prevent the occurrence of safety accidents.

[0023] Please see Figure 2 , Figure 3 , Figure 4 and Figure 8Considering that the drive motor of the winch may suddenly become weak and require a rapid response to stop it, multiple passive engaging blocks 265 distributed circumferentially are provided at both ends of the winch drum 26. These passive engaging blocks 265 are rotatably connected to the winch drum 26 and correspond to the stop mechanism 3. When the winch drum 26 rotates rapidly, due to centrifugal force, the passive engaging blocks 265 rotate and are thrown out. The thrown-out passive engaging blocks 265 engage with the stop rod 33 on the stop mechanism 3, which abuts against the passive engaging blocks 265, preventing the winch drum 26 from rotating and thus preventing the load from being lifted. As the winding continues to descend, a fixing plate 266 corresponding to a passive locking block 265 is fixed inside the winch drum 26. An arc spring 267 is respectively provided between the fixing plate 266 and the passive locking block 265. The passive locking block 265 is engaged with the stop mechanism 3. When the winch drum 26 rotates normally, a small centrifugal force is generated. Combined with the weight of the passive locking block 265, to prevent the passive locking block 265 from being opened when the winch drum 26 is working normally, the arc spring 267 connects the passive locking block 265 and the fixing plate 266. The arc spring 267 pulls the passive locking block 265 to prevent the passive locking block 265 from being opened when the winch drum 26 is working normally, thus preventing an unexpected stop.

[0024] Please see Figure 2 , Figure 3 , Figure 4 and Figure 6The stopping mechanism 3 includes a transmission rod 31, on which two symmetrically arranged stopping components are provided. Each stopping component includes two fixed seats 32, which connect the transmission rod 31 and the base 21. The transmission rod 31 is rotatably connected to the base 21. A stopping rod 33 is provided between the two fixed seats 32. Two push rods 34, which are slidably connected to the transmission rod 31, are provided on the left side of the stopping rod 33. Compression springs 35 are respectively provided on the outer side of the two push rods 34, and the compression springs 35 are sleeved on the transmission rod 31. A gap is provided between the two push rods 34, and the gap is greater than the thickness of the locking plate 263. A locking block 312 and a locking strip 311 are fixed on the transmission rod 31. A through groove 341 is opened on the push rod 34. The stopping rod 33 is locked with the locking block 312. The through groove 341 corresponds to the locking strip 311. The locking strip 311 prevents the two push rods 34 from getting close. The locking plate 263 has multiple locking slots 264 along its circumference. These slots 264 engage with the stop mechanism 3. When the winch drum 26 rotates rapidly, centrifugal force causes the passive locking block 265 to rotate. The passive locking block 265 is thrown out and momentarily abuts against the stop rod 33, causing the stop rod 33 to rotate at a small angle. This small-angle rotation of the stop rod 33 drives the transmission rod 31 to rotate. After the round rod 31 rotates, the locking strip 311 rotates along with the transmission round rod 31. After the locking strip 311 rotates, it will correspond with the through groove 341 on the top rod 34. At this time, the locking strip 311 no longer abuts against the two top rods 34. After the locking strip 311 corresponds with the through groove 341, the two compression springs 35 will push the two top rods 34 closer to each other. After the top rods 34 are close together, they will be locked in the locking groove 264 on the locking plate 263, thereby preventing the winch drum 26 from rotating.

[0025] Please see Figure 2 , Figure 3 , Figure 4 and Figure 7The stopping component includes two first connecting rods 36 slidably connected to the transmission rod 31. A gap is provided between the left first connecting rod 36 and the right fixed seat 32, the gap being the same as the thickness of the side partition 262. Second connecting rods 37 are rotatably connected to the first connecting rods 36 respectively. Compression blocks 371 are rotatably connected to the opposite sides of the two second connecting rods 37 respectively. A pressure rod 372 is provided between the two compression blocks 371. A pressure block 361 is fixed to the opposite sides of the two first connecting rods 36. A transmission block 38 corresponding to the pressure block 361 is provided between the two first connecting rods 36. Block 38 is fixedly connected to transmission rod 31. When the transmission block 38 rotates, it pushes the first connecting rod 36 to move. After the transmission rod 31 rotates, it will drive the transmission block 38 to rotate. Due to the action of the transmission block 38 and the pressure block 361, the transmission block 38 will push against the first connecting rod 36 to move after rotating. Then, the second connecting rod 37 will apply pressure to the middle partition 261 and the side partition 262 to increase the friction between them, thereby causing the winch drum 26 to decelerate and stop. Through the action of the stop rod 33, the push rod 34 and the second connecting rod 37, the winch drum 26 can stop instantly.

[0026] Please see Figure 2 , Figure 3 , Figure 4 and Figure 6 In actual operation of the hoisting assembly, when the wire rope is fully wound onto the hoisting drum 26 and moved from the first layer to the second layer, the wire rope often piles vertically on the first layer, and sometimes even the next loop of wire rope is piled directly onto the third layer, preventing smooth rope routing. This phenomenon is called "rope piling." When the rope piling reaches a certain extent, the wire rope "jumps" down from the second or third layer, causing a strong impact on the bottom layer of wire rope, severely affecting its service life. The compression block 371 is composed of a cylinder and a frustum. The first connecting... A tension spring 373 is provided between the rod 36 and the second connecting rod 37. The compression block 371 is composed of a cylinder and a frustum. Due to the inclined surface of the frustum, when the wire rope climbs from the first layer to the second layer, the component force generated by the rotating surface on the wire rope points towards the direction of the second layer of the wire rope, which can reduce or avoid the phenomenon of "rope piling" or "rope skipping" of the wire rope. The tension spring 373 pulls the second connecting rod 37 to apply pressure to the winch drum 26, and at the same time applies pressure to the wire rope wound on the winch drum 26 to prevent the wire rope from becoming disordered.

[0027] Please see Figure 2 and Figure 8A power source 22 is fixed on the base 21. A braking system 23 is provided at the output end of the power source 22. The braking system 23 consists of a brake frame including components such as a brake arm, brake shoes, a brake wheel, a brake spring, a brake release device, such as an electromagnet, an electro-hydraulic actuator, etc. The brake shoes are installed on the brake arm and connected to the shaft of the power source 22. Under normal conditions, the elastic force generated by the brake spring makes the brake shoes tightly hold the brake wheel, which is in a braking state and prevents the drum from rotating, thereby preventing the heavy object from accidentally sliding down due to its own weight. When it is necessary to lift or lower the heavy object, the brake release device is energized and acts to overcome the elastic force of the brake spring, so that the brake shoes separate from the brake wheel, release the brake, and the motor can drive the drum to operate normally. When it is necessary to stop the movement of the heavy object, the brake release device is de-energized, the brake spring returns to its elasticity, and the brake shoes grip the brake wheel again to achieve rapid braking. The braking system 23 is fixed on the base 21. The output end of the power source 22 is driven by a reducer 24 fixedly connected to the base 21. The output end of the reducer 24 is connected to a drive shaft 25. The drive shaft 25 is driven by a gear and a winch drum 26. A pulley 27 is fixed on the base 21. The power source 22 provides power and transmits the power to the winch drum 26 through the reducer 24 and the drive shaft 25, causing the winch drum 26 to rotate, thereby lifting or lowering the heavy object.

[0028] When using this invention: Power source 22 operates, causing winch drum 26 to rotate, thereby lifting the load. During the lifting process, if power source 22 suddenly loses power, winch drum 26 rotates rapidly. Due to centrifugal force, passive locking block 265 rotates and is thrown out, instantly abutting against stop rod 33, causing stop rod 33 to rotate at a small angle. After stop rod 33 rotates at a small angle, it drives transmission rod 31 to rotate. After transmission rod 31 rotates, locking strip 311 rotates with transmission rod 31. After locking strip 311 rotates, it aligns with through groove 341 on top rod 34. At this time, locking strip 311 no longer abuts against the two top rods 34. After the bar 311 aligns with the through slot 341, the two compression springs 35 push the two push rods 34 closer together. After the push rods 34 approach each other, they will engage in the slots 264 on the locking plate 263, thereby preventing the winch drum 26 from rotating. At the same time, after the transmission rod 31 rotates, the transmission rod 31 will drive the transmission block 38 to rotate. Due to the action of the transmission block 38 and the pressure block 361, after the transmission block 38 rotates, it will push the first connecting rod 36 to move. Then the second connecting rod 37 will apply pressure to the middle partition 261 and the side partition 262 to increase the friction between them, thereby causing the winch drum 26 to decelerate and stop. Through the action of the stop rod 33, the push rod 34 and the second connecting rod 37, the winch drum 26 can stop instantly.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nuclear power plant personnel crane, characterized in that: The system includes a main beam (1) of a pedestrian bridge, on which a winch traveling mechanism (2) travels. Running devices (11) are provided at the left and right ends of the main beam (1). The winch traveling mechanism (2) includes a base (21). A power source (22) is fixed at the upper end of the base (21). A winch drum (26) is rotatably connected to the upper end of the base (21). A snap-fit ​​plate (263) is fixed at the front and rear ends of the winch drum (26). A middle partition plate (261) is fixed on the winch drum (26). Side partition plates (262) that are fixedly connected to the winch drum (26) are provided on the front and rear sides of the middle partition plate (261). A stop mechanism (3) for stopping the winch drum (26) is provided on the base (21).

2. A nuclear power plant personnel crane according to claim 1, characterized in that: The stopping mechanism (3) includes a transmission rod (31), on which two symmetrically arranged stopping components are provided. Each stopping component includes two fixed seats (32), which are used to connect the transmission rod (31) and the base (21). The transmission rod (31) is rotatably connected to the base (21). A stopping rod (33) is provided between the two fixed seats (32). Two push rods (34) that are slidably connected to the transmission rod (31) are provided on the left side of the stopping rod (33). Compression springs (35) are respectively provided on the outer side of the two push rods (34). The compression springs (35) are sleeved on the transmission rod (31). A gap is provided between the two push rods (34), which is greater than the thickness of the snap-fit ​​plate (263).

3. A nuclear power plant personnel crane according to claim 2, characterized in that: The transmission rod (31) is fixed with a snap-fit ​​block (312) and a snap-fit ​​strip (311). The top rod (34) is provided with a through groove (341). The stop rod (33) is snapped with the snap-fit ​​block (312). The through groove (341) corresponds to the snap-fit ​​strip (311). The snap-fit ​​strip (311) prevents the two top rods (34) from getting close.

4. A nuclear power plant personnel crane according to claim 2, characterized in that: The stop component includes two first connecting rods (36) that are slidably connected to the transmission rod (31). A gap is provided between the left first connecting rod (36) and the right fixed seat (32), and the gap is consistent with the thickness of the side partition (262). A second connecting rod (37) is rotatably connected to the first connecting rod (36). A pressing block (371) is rotatably connected to the opposite side of the two second connecting rods (37). A pressure rod (372) is provided between the two pressing blocks (371). The pressing block (371) is composed of a cylinder and a frustum. A tension spring (373) is provided between the first connecting rod (36) and the second connecting rod (37).

5. A nuclear power plant personnel crane according to claim 4, characterized in that: A pressure block (361) is fixed on the opposite side of the two first connecting rods (36), and a transmission block (38) corresponding to the pressure block (361) is provided between the two first connecting rods (36). The transmission block (38) is fixedly connected to the transmission rod (31). When the transmission block (38) rotates, it pushes the first connecting rod (36) to move.

6. A nuclear power plant personnel crane according to claim 1, characterized in that: The snap-fit ​​plate (263) has multiple snap-fit ​​slots (264) along its circumference, and the snap-fit ​​slots (264) are snapped into the stop mechanism (3).

7. A nuclear power plant personnel crane according to claim 1, characterized in that: Multiple passive locking blocks (265) are respectively provided at the front and rear ends of the winch (26) and distributed along its circumference. The passive locking blocks (265) are rotatably connected to the winch (26). The winch (26) has a fixed plate (266) that corresponds one-to-one with the passive locking blocks (265) inside. An arc spring (267) is respectively provided between the fixed plate (266) and the passive locking blocks (265). The passive locking blocks (265) are correspondingly locked with the stop mechanism (3).

8. A nuclear power plant personnel crane according to claim 1, characterized in that: A power source (22) is fixed on the base (21). A braking system (23) is provided at the output end of the power source (22). The braking system (23) is fixed on the base (21). A reducer (24) is connected to the output end of the power source (22) and fixedly connected to the base (21). A drive shaft (25) is connected to the output end of the reducer (24). The drive shaft (25) is connected to the winch drum (26) through gears. A pulley (27) is fixed on the base (21).

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