Winch structure

Abstract

The utility model discloses a winch structure which comprises a shell, a winch drum and a planetary speed reducing mechanism, the winch drum and the planetary speed reducing mechanism are arranged in the shell, the output end of the planetary speed reducing mechanism is in transmission connection with the winch drum, the planetary speed reducing mechanism is a 2Z-X type negative sign mechanism, and the input end of the planetary speed reducing mechanism is in transmission connection with a transmission shaft. The winch further comprises a power input shaft and a brake mechanism, the brake mechanism is arranged in the winch drum and located between the power input shaft and the transmission shaft, the input end of the power input shaft extends out of the shell, and the output end of the power input shaft extends into the winch drum and is in transmission connection with the input end of the transmission shaft through the brake mechanism. The planetary speed reducing mechanism is designed into a 2Z-X type negative mechanism and is provided with an independent brake mechanism, so that the braking effect is good, the transmission efficiency is high, the effect is better when the winch draws a heavy object, and stable and reliable traction of a large load is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of traction devices, in particular to a winch structure. Background Art

[0002] A winch is a device that uses a rope or chain wrapped around a rotating cylinder to lift or pull heavy objects horizontally through human or mechanical power. Common winches on the market are usually equipped with motors. Winch with motors have become the first choice for many heavy operations due to their powerful power and automated operation. Winch without motors are relatively niche. However, with the advancement of technology and the diversification of application scenarios, winches without motors have gradually emerged. Winch with motor cannot be used normally in an environment without electricity or insufficient power, while winch without motor is not subject to this restriction, which greatly broadens the scope of use. In addition, winch without motor is small in size and lighter in weight, which enables it to be quickly deployed and put into use immediately in scenarios such as outdoor adventures, emergency rescue, and disaster relief. Its small size also greatly reduces the difficulty of transportation and storage. During use, users can combine it with various power tools according to their needs, such as pistol drills, electric wrenches, etc. This diversified power input method meets the usage needs in different scenarios and is more flexible.

[0003] Winch without motor usually adopts 3Z ​​type planetary gear transmission mechanism. The advantage of this transmission mechanism is that it can self-lock in reverse and can achieve stable transmission and locking without relying on the brake system. The disadvantage is that it is easy to break teeth. Its transmission efficiency η 3Z理论值 =0.7-0.84 is relatively low, so the product can usually only be used for ground and flat traction. When doing vertical traction, the 3Z planetary gear transmission mechanism is easily damaged. The winch without a motor is driven by an electric tool, and the power provided by the electric tool is often lower than the power provided by the traditional motor. In addition, the transmission efficiency of the 3Z planetary gear transmission mechanism is relatively low, which makes the winch without a motor not very effective when pulling heavy objects. Therefore, it is necessary to improve it. Utility Model Content

[0004] The purpose of the utility model is to provide a winch structure with a simple and reasonable structure, convenient operation, high transmission efficiency, and ensure stable and reliable traction of large loads in response to the defects and shortcomings of the existing technology.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The utility model describes a winch structure, including a shell and a hoisting drum and a planetary reduction mechanism arranged in the shell. The output end of the planetary reduction mechanism is transmission-connected to the hoisting drum. The planetary reduction mechanism is a 2Z-X type negative mechanism. The input end of the planetary reduction mechanism is transmission-connected to a transmission shaft. The winch also includes a power input shaft and a brake mechanism. The brake mechanism is arranged in the hoisting drum and is located between the power input shaft and the transmission shaft. The input end of the power input shaft extends out of the shell, and the output end of the power input shaft extends into the hoisting drum. The output end of the power input shaft is transmission-connected to the input end of the transmission shaft through the brake mechanism.

[0007] Furthermore, the transmission shaft is provided with a thrust spring, a cotter pin, a bearing, a spline tooth and a latch in sequence from front to back, the thrust spring is sleeved on the transmission shaft, one end of the thrust spring is against the brake mechanism, and the other end of the thrust spring is against the cotter pin, the spline tooth shaft limit is located between the bearing and the latch, the inner wall of the winch cylinder is provided with a first gear ring portion, and the planetary reduction mechanism is provided with a second gear ring portion, the second gear ring portion and the first gear ring portion are both engaged with the spline teeth, and the second gear ring portion is transmission-connected to the first gear ring portion through the spline teeth.

[0008] Furthermore, the planetary reduction mechanism includes a reduction gear housing, a first-stage sun gear, a first-stage planetary gear, a first-stage planetary gear carrier, a second-stage sun gear, a second-stage planetary gear, a second-stage planetary gear carrier, a third-stage sun gear, a third-stage planetary gear and a planetary gear outer plate which are arranged in the reduction gear housing and are meshed and connected in sequence. The inner wall of the reduction gear housing is provided with an inner ring gear, the first-stage planetary gear, the second-stage planetary gear and the third-stage planetary gear are meshed with the inner ring gear, the output end of the transmission shaft is transmission-connected to the first-stage sun gear, and the second ring gear portion is provided in the outer plate of the planetary gear.

[0009] Furthermore, the teeth of the spline teeth are provided with guiding inclined surfaces that cooperate with the outer plates of the planetary gears.

[0010] Furthermore, a clutch device is provided at the tail of the planetary reduction mechanism, and the clutch device includes a clutch knob and a triangular block. The triangular block is arranged between the transmission shaft and the clutch knob, and the triangular block is provided with three legs. A spiral slide corresponding to the triangular block is provided in the reduction gear housing, and the inner core of the clutch knob extends axially with a shift fork corresponding to the legs.

[0011] Furthermore, the brake mechanism includes a brake cylinder and an active block, a passive block and a reverse expansion spring arranged in the brake cylinder. A support plate is fixed in the shell, the brake cylinder is fixedly connected to the support plate, the output end of the power input shaft is transmission-connected to the active block, one end of the passive block is transmission-connected to the active block, and the other end of the passive block is transmission-connected to the transmission shaft. The reverse expansion spring is sleeved between the active block and the passive block, and both ends of the reverse expansion spring are provided with inwardly bent sections, and the active block and the passive block are both provided with notches that engage with the bending sections.

[0012] Furthermore, the bent section is bent toward the axial direction of the reverse expansion spring.

[0013] Furthermore, the active block is provided with a first plug-in block extending axially near one end of the passive block, and the passive block is provided with a center section extending axially near one end of the active block. The outer wall of the center section is provided with a second plug-in block that rotates against the first plug-in block, and the notch portion is provided on the first plug-in block and the second plug-in block.

[0014] Furthermore, the first plug-in block and the second plug-in block are both arc-shaped blocks.

[0015] Furthermore, a plurality of limiting columns are provided in the shell, and rolling sleeves are movably sleeved on the outer walls of the limiting columns.

[0016] The beneficial effects of the present invention are as follows: the winch structure described in the present invention designs the planetary reduction mechanism as a 2Z-X type negative mechanism and is equipped with a separate brake mechanism, which has good braking effect and high transmission efficiency. The winch is more effective in pulling heavy objects, ensuring stable and reliable traction of large loads. It can not only be used for ground and plane traction, but also can achieve vertical lifting.

[0017] In its initial state, the inertia spring engages frictionally with the inner wall of the brake cylinder, and this friction is less than the friction between the two during braking. When the active block applies torque, regardless of direction, it causes the inertia spring to tighten, shrinking its outer diameter and eliminating friction between the spring and the cylinder. When the passive block applies torque, the second insert acts in the opposite direction on the inertia spring, forcing its outer diameter to expand, locking it in the cylinder and achieving braking.

[0018] A limiting column is provided in the shell, and a rolling sleeve is movably provided on the outer wall of the limiting column. There are four limiting columns, two of which are longer and the other two are shorter. These four limiting columns cleverly form a rectangular rope outlet. When the rope passes through the rope outlet, rolling friction is generated with the rolling sleeve. The rolling sleeve rotates as the rope moves, reducing the friction caused to the rope, thereby extending the service life of the rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the utility model from a first viewing angle;

[0020] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0021] Figure 3 It is a schematic diagram of the decomposed structure of the brake mechanism in the second perspective;

[0022] Figure 4 It is a schematic diagram of the decomposed structure of the brake mechanism in the third perspective;

[0023] Figure 5 It is a structural diagram of the reverse expansion spring;

[0024] Figure 6 It is a schematic diagram of the structure of the connection between the reverse expansion spring and the active block and the passive block;

[0025] Figure 7 It is a schematic diagram of the exploded structure of the planetary reduction mechanism;

[0026] Figure 8 It is a schematic diagram of the decomposed structure of the clutch mechanism;

[0027] Figure 9 Schematic diagram of the cross-section structure of the brake mechanism, transmission shaft, planetary reduction mechanism and clutch mechanism;

[0028] Figure 10 It is a structural diagram of the winch drum;

[0029] Figure 11 This is a schematic diagram of the overall structure of the utility model from a fourth viewing angle;

[0030] Figure 12 It is a structural diagram of the limit column;

[0031] Figure 13 It is a structural diagram of spline teeth.

[0032] Figure 1 - Figure 13Middle: 1. Housing; 11. Second hook; 12. Limiting column; 121. Rolling sleeve; 13. Rope outlet; 14. Support plate; 141. Connecting column; 2. Hoist drum; 21. Rope; 211. First hook; 22. First gear ring; 3. Power input shaft; 4. Planetary reduction mechanism; 41. Reducer housing; 411. Spiral slideway; 4111. Sliding groove; 412. Inner gear ring; 421. Planetary gear outer plate; 4211. Second gear ring; 422. Third-stage central gear; 423. Third-stage planetary gear; 424. Secondary planetary gear; 425, primary planetary gear; 5, clutch mechanism; 51, clutch knob; 511, shift fork; 52, triangular block; 521, support foot; 6, brake mechanism; 61, active block; 611, first plug-in block; 62, passive block; 621, second plug-in block; 63, reverse expansion spring; 631, bending section; 64, brake cylinder; 65, notch; 71, transmission shaft; 72, spline teeth; 721, guide ramp; 73, gasket; 74, bearing; 75, latch; 76, cotter pin; 77, thrust spring; 78, retaining spring. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] like Figure 1 - Figure 13 The winch structure shown includes a shell 1 and a hoisting drum 2 and a planetary reduction mechanism 4 arranged in the shell 1. The hoisting drum 2 is rotatably arranged in the shell 1. A rope 21 is wound around the outer wall of the hoisting drum 2. The upper end of the rope 21 is connected to a first hook 211. Both sides of the hoisting drum 2 are fixedly connected to a support plate 14. The shell 1 cover is arranged outside the support plate 14 and is fixedly connected to the support plate 14. A plurality of connecting columns 141 are fixedly connected between the two support plates 14. The second hook 11 is connected to the connecting column 141 at the bottom of the support plate 14. The output end of the planetary reduction mechanism 4 is transmission-connected to the hoisting drum 2. The planetary reduction mechanism 4 is a 2Z-X type negative mechanism (that is, this application adopts a 2Z-X type negative mechanism NGW). The input end of the planetary reduction mechanism 4 is transmission-connected to a transmission shaft 71. The 2Z-X type negative mechanism has the characteristics of simple structure and high transmission efficiency, and can be used with a transmission code Indicates. Under reasonable structural conditions, usually, its transmission ratio range is Transmission efficiency High transmission efficiency.

[0035] The negative sign mechanism of the 2Z-X type does not have a reverse self-locking function. Preferably, the winch structure described in the present invention also includes a power input shaft 3 and a brake mechanism 6. The brake mechanism 6 is arranged in the winch drum 2 and is located between the power input shaft 3 and the transmission shaft 71. The input end of the power input shaft 3 extends out of the shell 1, and the output end of the power input shaft 3 extends into the winch drum 2. The output end of the power input shaft 3 is connected to the input end of the transmission shaft 71 through the brake mechanism 6. The input end of the power input shaft 3 is connected to an external drive. Specifically, the external drive can be an electric tool such as an electric drill or an electric wrench. Users can choose a suitable electric tool to drive the winch according to their needs, which is highly flexible.

[0036] Specifically, see Figure 3 - Figure 6 The brake mechanism 6 includes a brake cylinder 64 and an active block 61, a passive block 62 and a reverse expansion spring 63 arranged in the brake cylinder 64. The brake cylinder 64 is fixedly connected to the support plate 14 on the side close to the power input shaft 3, and the connection relationship is stable. The output end of the power input shaft 3 is transmission-connected to the active block 61, one end of the passive block 62 is transmission-connected to the active block 61, and the other end of the passive block 62 is transmission-connected to the transmission shaft 71. The reverse expansion spring 63 is sleeved between the active block 61 and the passive block 62. Both ends of the reverse expansion spring 63 are provided with a bending section 631 bent inwardly. The active block 61 and the passive block 62 are both provided with a notch portion 65 that is snap-fitted with the bending section 631. The bending section 631 extends into the notch portion 65 and engages with the notch portion 65 is connected. Preferably, in this embodiment, the active block 61 is provided with a first plug block 611 extending axially at one end near the passive block 62, and the passive block 62 is provided with a center section extending axially at one end near the active block 61. The outer wall of the center section is provided with a second plug block 621 which is rotatably matched with the first plug block 611. The first plug block 611 and the second plug block 621 are provided with the notch portion 65. Preferably, in this embodiment, the first plug block 611 and the second plug block 621 are both arc-shaped blocks. Specifically, the first plug block 611 and the second plug block 621 form a tooth-type transmission with good transmission effect. When the active block 61 rotates, the passive block 62 is driven to rotate through the cooperation of the first plug block 611 and the second plug block 621.

[0037] Preferably, in this embodiment, refer to Figure 5 The bent section 631 is bent toward the axial direction of the reverse expansion spring 63 to ensure that the reverse expansion spring 63 can be tightly connected to the active block 61 and the passive block 62. Preferably, in this embodiment, the bending angle of the bent section 631 is 90 degrees, so that it is not easy to separate from the notch 65. Both the torque input by the active block 61 and the torque actively input by the passive block 62 can act well on the reverse expansion spring 63.

[0038] In its initial state, the reverse expansion spring 63 is in frictional contact with the inner wall of the brake cylinder 64, and this friction is less than the friction between the reverse expansion spring 63 and the brake cylinder 64 during braking. When the active block 61 inputs torque, regardless of direction, it triggers a tightening reaction of the reverse expansion spring 63, causing its outer diameter to decrease, thus preventing friction between the reverse expansion spring 63 and the brake cylinder 64. When the passive block 62 actively inputs torque, the second plug 621 acts in the opposite direction on the reverse expansion spring 63, forcing its outer diameter to expand, causing the reverse expansion spring 63 to become stuck in the brake cylinder 64, achieving braking, improving transmission efficiency, and ensuring stable and reliable traction of large loads.

[0039] The planetary reduction mechanism 4 is designed as a 2Z-X type negative mechanism and is equipped with a separate brake mechanism 6, which has good braking effect and high transmission efficiency. The winch is more effective in pulling heavy objects, ensuring stable and reliable traction of large loads. It can not only be used for ground and plane traction, but also can achieve vertical lifting.

[0040] Preferably, in this embodiment, refer to Figure 9 The transmission shaft 71 is provided with a thrust spring 77, a cotter pin 76, a bearing 74, a spline tooth 72 and a latch 75 from front to back. The thrust spring 77 is sleeved on the transmission shaft 71. One end of the thrust spring 77 is against the brake mechanism, and the other end of the thrust spring 77 is against the cotter pin 76. The spline tooth 72 is axially limited between the bearing 74 and the latch 75. A retaining spring 78 is also fixed to the front end of the bearing 74. A card slot that cooperates with the retaining spring 78 is provided on the transmission shaft 71. A gasket 73 is also provided between the spline tooth 72 and the latch 75. Figure 10 A first gear ring portion 22 is provided on the inner wall of the hoisting drum 2, and a second gear ring portion 4211 is provided in the planetary reduction mechanism. The second gear ring portion 4211 and the first gear ring portion 22 are both engaged with the spline teeth 72, and the second gear ring portion 4211 is transmission-connected to the first gear ring portion 22 through the spline teeth 72.

[0041] Preferably, in this embodiment, refer to Figure 7 The planetary reduction mechanism includes a reduction gear housing 41, a first-stage sun gear, a first-stage planetary gear 425, a first-stage planetary gear carrier, a second-stage sun gear, a second-stage planetary gear 424, a second-stage planetary gear carrier, a third-stage sun gear 422, a third-stage planetary gear 423 and a planetary gear outer plate 421, which are arranged in the reduction gear housing 41 and are meshed and connected in sequence. The inner wall of the reduction gear housing 41 is provided with an inner ring gear 412, and the first-stage planetary gear 425, the second-stage planetary gear 424 and the third-stage planetary gear 423 are meshed with the inner ring gear 412. The output end of the transmission shaft 71 is transmission-connected to the first-stage sun gear, and the second ring gear portion 4211 is provided in the planetary gear outer plate 421.

[0042] Specifically, the transmission shaft 71 drives the first-stage center gear to rotate, the inner ring gear 412 is fixed, the first-stage planetary gear 425 drives the first-stage planetary gear frame to rotate, the tooth hole in the center of the first-stage frame engages with the second-stage center gear, driving the second-stage center gear to rotate, the second-stage center gear drives the second-stage planetary gear frame to rotate through the second-stage planetary gear 424, the inner ring gear 412 is fixed, the second-stage planetary gear frame runs normally at a reduction ratio, the second-stage planetary gear frame drives the third-stage center gear 422 to rotate, the inner ring gear 412 is fixed, the third-stage center gear 422 drives the planetary gear outer plate 421 to rotate through the third-stage planetary gear 423, the planetary gear outer plate 421 drives the spline teeth 72 to rotate, the spline teeth 72 drives the winch drum 2 to rotate, and finally pulls the rope 21.

[0043] Preferably, in this embodiment, refer to Figure 13 The spline teeth 72 are provided with guide inclined surfaces 721 that cooperate with the planetary gear outer plate 421, so that the spline teeth 72 are more easily inserted into the planetary gear outer plate 421 and meshed with the second gear ring part 4211.

[0044] Preferably, in this embodiment, refer to Figure 8 , the tail of the planetary reduction mechanism is provided with a clutch device, and the clutch device includes a clutch knob 51 and a triangular block 52. The triangular block 52 is set between the transmission shaft 71 and the clutch knob 51, and the triangular block 52 is provided with three legs 521. The reduction box housing 41 is provided with a spiral slide 411 corresponding to the triangular block 52, and the inner core of the clutch knob 51 extends axially with a shift fork 511 corresponding to the legs 521. Preferably, in this embodiment, the spiral slide 411 is provided with three sections of spiral sliding grooves 4111, and the end faces of the three legs 521 of the triangular block 52 are respectively set against the In the sliding groove 4111, when the clutch knob 51 is rotated counterclockwise, the shift fork 511 drives the triangular block 52 to slide in the sliding groove 4111, and the triangular block 52 changes its axial position, pushing the transmission shaft 71 to move in the direction away from the planetary reduction mechanism 4, so that the spline teeth 72 are away from the planetary reduction mechanism 4 and disengage from the second gear ring part 4211. At this time, the winch drum 2 is in a disengaged state from the planetary reduction mechanism 4. At this time, the rope 21 can be manually pulled outward quickly. When the clutch knob 51 is rotated clockwise, the transmission shaft 71 is reset under the action of the thrust spring 77, and the spline teeth 72 are engaged with the second gear ring part 4211 again.

[0045] In the current winch products, many electric winches use a cast steel square frame structure as the rope outlet 13. Although this design is strong and durable, it has a significant problem: it is easy to cut the rope 21. The rope 21 is worn due to long-term friction, which is prone to safety hazards. In the utility model, a plurality of limit columns 12 are provided in the housing 1, and the outer wall of the limit column 12 is movably sleeved with a rolling sleeve 121. Preferably, in this embodiment, refer to Figure 11 - Figure 12 There are four limiting columns 12, two of which are longer and the other two are shorter. These four limiting columns 12 cleverly form a rectangular rope outlet 13. When the rope 21 passes through the rope outlet 13, it will generate rolling friction with the rolling sleeve 121. The rolling sleeve rotates as the rope 21 moves, reducing the friction caused to the rope 21, thereby extending the service life of the rope 21.

[0046] The working principle of the present utility model is as follows: the electric tool drives the brake mechanism 6 to drive the planetary reduction mechanism 4 to decelerate through the transmission shaft 71, and finally drives the winch drum 2 to rotate through the spline teeth 72. After the winch drum 2 stops being wound in, the reverse pulling force of the load makes the winch drum 2 have a movement trend of reverse rotation. At this time, the brake mechanism 6 brakes to ensure operation safety; when the user needs to pull out the rope 21 quickly, the clutch knob 51 is rotated counterclockwise to drive the triangular block 52 to push the transmission shaft 71 in the direction away from the planetary reduction mechanism 4, so that the spline teeth 72 are disengaged from the planetary reduction mechanism 4. At this time, the clutch is in a disengaged state, and the rope 21 can be manually pulled outward quickly. When work is needed, the clutch knob 51 is rotated clockwise, and the transmission shaft 71 is reset under the action of the thrust spring 77. The spline teeth 72 are engaged with the planetary reduction mechanism 4 again, and the product works normally.

[0047] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A winch structure comprising a housing (1), a hoisting drum (2) and a planetary reduction mechanism (4) arranged in the housing (1), wherein the output end of the planetary reduction mechanism (4) is transmission-connected to the hoisting drum (2), and characterized in that: The planetary reduction mechanism (4) is a 2Z-X type negative mechanism. The input end of the planetary reduction mechanism (4) is connected to the transmission shaft (71). The winch further includes a power input shaft (3) and a brake mechanism (6). The brake mechanism (6) is arranged in the hoist drum (2) and is located between the power input shaft (3) and the transmission shaft (71). The input end of the power input shaft (3) extends out of the housing (1), and the output end of the power input shaft (3) extends into the hoist drum (2). The output end of the power input shaft (3) is connected to the input end of the transmission shaft (71) through the brake mechanism (6).

2. A winch structure according to claim 1, characterized in that: The transmission shaft (71) is provided with a thrust spring (77), a cotter pin (76), a bearing (74), a spline tooth (72) and a latch (75) in sequence from front to back. The thrust spring (77) is sleeved on the transmission shaft (71). One end of the thrust spring (77) abuts against the brake mechanism, and the other end of the thrust spring (77) abuts against the cotter pin (76). The spline tooth (72) is axially limited between the bearing (74) and the latch (75). The inner wall of the hoist drum (2) is provided with a first gear ring portion (22). The planetary reduction mechanism (4) is provided with a second gear ring portion (4211). The second gear ring portion (4211) and the first gear ring portion (22) are both engaged with the spline tooth (72). The second gear ring portion (4211) is connected to the first gear ring portion (22) through the spline tooth (72).

3. A winch structure according to claim 2, characterized in that: The planetary reduction mechanism (4) comprises a reduction box housing (41), a first-stage sun gear, a first-stage planetary gear (425), a first-stage planetary gear carrier, a second-stage sun gear, a second-stage planetary gear (424), a second-stage planetary gear carrier, a third-stage sun gear (422), a third-stage planetary gear (423) and a planetary gear outer plate (421) arranged in the reduction box housing (41) and meshed and connected in sequence, an inner ring gear (412) is provided on the inner wall of the reduction box housing (41), the first-stage planetary gear (425), the second-stage planetary gear (424) and the third-stage planetary gear (423) mesh with the inner ring gear (412), an output end of the transmission shaft (71) is transmission-connected to the first-stage sun gear, and the second ring gear portion (4211) is provided in the planetary gear outer plate (421).

4. A winch structure according to claim 3, characterized in that: The teeth of the spline teeth (72) are provided with a guide inclined surface (721) that cooperates with the outer plate (421) of the planetary gear.

5. A winch structure according to claim 3, characterized in that: A clutch device is provided at the tail of the planetary reduction mechanism (4), the clutch device comprising a clutch knob (51) and a triangular block (52), the triangular block (52) being arranged between the transmission shaft (71) and the clutch knob (51), the triangular block (52) being provided with three legs (521), a spiral slideway (411) corresponding to the triangular block (52) being provided in the reduction box housing (41), and a shift fork (511) corresponding to the legs (521) being extended axially from the inner core of the clutch knob (51).

6. A winch structure according to claim 1, characterized in that: The brake mechanism (6) includes a brake cylinder (64) and an active block (61), a passive block (62) and a reverse expansion spring (63) arranged in the brake cylinder (64). A support plate (14) is fixedly provided in the housing (1). The brake cylinder (64) is fixedly connected to the support plate (14). The output end of the power input shaft (3) is transmission-connected to the active block (61), one end of the passive block (62) is transmission-connected to the active block (61), and the other end of the passive block (62) is transmission-connected to the transmission shaft (71). The reverse expansion spring (63) is sleeved between the active block (61) and the passive block (62). Both ends of the reverse expansion spring (63) are provided with an inwardly bent bending section (631). The active block (61) and the passive block (62) are both provided with a notch (65) that is engaged with the bending section (631).

7. A winch structure according to claim 6, characterized in that: The bent section (631) is bent toward the axial direction of the reverse expansion spring (63).

8. The winch structure according to claim 6, characterized in that: The active block (61) is provided with a first plug-in block (611) extending axially at one end close to the passive block (62), and the passive block (62) is provided with a center section extending axially at one end close to the active block (61). The outer wall of the center section is provided with a second plug-in block (621) rotatably engaged with the first plug-in block (611), and the notch portion (65) is provided on the first plug-in block (611) and the second plug-in block (621).

9. A winch structure according to claim 8, characterized in that: The first plug-in block (611) and the second plug-in block (621) are both arc-shaped blocks.

10. The winch structure according to claim 1, characterized in that: A plurality of limiting columns (12) are provided in the housing (1), and rolling sleeves (121) are movably sleeved on the outer walls of the limiting columns (12).

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