Hydraulic winch with limit function and switchable traction mode

Abstract

The present invention relates to a hydraulic winch with a limiting function and switchable traction mode, comprising a frame, a drum rotatably arranged on the frame and located in the middle, a traction rope wound on the drum that can be retracted and released, a traction rope limiting component fixed to the frame behind the drum, a hydraulic drive motor fixed to the frame and located on one side of the drum for driving the drum to rotate back and forth and a planetary reduction component on the other side, a brake component inside the drum and located on the outer periphery of the output shaft of the hydraulic drive motor, and the hydraulic winch also includes a clutch device arranged inside the drum; the present invention provides two traction modes that can be switched to each other, the switching step needs to be manual and is performed when the traction rope is replaced, and the switching is completed by using the brake provided by the winch and the oblique waist hole arranged outside the drum, and the application scenarios of the two traction modes are targeted, providing users with an additional choice, so that the winch can be used more safely and reasonably.

Description

Technical Field

[0001] The invention belongs to the technical field of winches, and in particular relates to a hydraulic winch with a limit function and switchable traction modes. Background Art

[0002] The winch, also known as a capstan, is widely used in the field of traction. Its main components include a drum, a power mechanism for driving the drum, and a traction rope wound around the drum. Common traction ropes are steel wire ropes and nylon ropes. A drum of the same specification can be installed with steel wire ropes or nylon ropes of the same diameter. Nylon ropes have the advantages of being affordable, light, easy to maintain, and easier to use in combination with pulleys. Steel wire ropes have the advantage of high tensile strength. The disadvantages are that steel wire ropes are heavy and require lubricating oil for maintenance, while nylon ropes have low tensile strength. Therefore, operators will choose suitable traction ropes in different application sites. In order to protect the traction rope during the traction operation, a sufficient number of safety circles must be retained and wrapped around the drum when the rope is released to prevent the traction rope from being broken at the connection of the drum when subjected to force. For example, the Chinese utility model patent with authorization announcement number CN210366772 U discloses a hydraulic winch with the function of preventing the traction rope from escaping. A bump block is arranged to drive the support rod to rotate when the traction rope reaches the maximum allowable rope release amount until the pressing piece contacts the button to disconnect the solenoid valve from distributing oil.

[0003] However, when nylon rope is used for traction, the existing technology does not provide further protection for its low tensile strength, or there are few protection methods. This is also one of the main causes of winch accidents. If steel wire rope is used, it is not easy to be overloaded and broken due to its material. Summary of the invention

[0004] In view of the above problems, the present invention provides a hydraulic winch with a limit function and switchable traction mode. When a nylon rope is used, the winch can be equipped with overload protection, and when a wire rope is used, the overload protection can be conveniently removed, thereby making the winch safer and more reasonably usable.

[0005] The invention objective of the present invention is achieved through the following technical solutions: a hydraulic winch with a limit function and switchable traction mode, comprising a frame, a drum rotatably arranged on the frame and located in the middle, a traction rope wound on the drum that can be retracted and released, a traction rope inlet and outlet guide fixed on the frame in front of the drum, a traction rope limit assembly fixed on the frame behind the drum, a hydraulic drive motor fixed on the frame and located on one side of the drum for driving the drum to rotate back and forth and a planetary reduction assembly on the other side, a brake assembly inside the drum and located on the outer periphery of the output shaft of the hydraulic drive motor, and the hydraulic winch also includes a clutch device arranged inside the drum;

[0006] The output shaft of the hydraulic drive motor is coaxially connected to one end of the clutch device, the other end of the clutch device is coaxially connected to the input end of the planetary reduction assembly, and the output end of the planetary reduction assembly is connected to the reel through gear meshing; during operation, the clutch device can be adjusted and switched to a mode with overload protection, or it can be switched to a continuous transmission mode without overload protection.

[0007] As a preferred embodiment, the specific structure of the clutch device includes a transmission clutch sleeve located in the middle, a transmission shaft coaxially installed in the transmission clutch sleeve through a bearing, an axial fixed ring seat coaxially connected to the transmission shaft and rotatable, a spring rear swivel abutting against the axial fixed ring seat and rotatably matched, a spring front swivel coaxially and parallelly arranged with the spring rear swivel and spaced apart, and a compression spring with one end fixed on the spring rear swivel and the other end fixed on the spring front swivel, a driven cam member rotatably connected to the transmission shaft, and an active cam member contacting and matching with the cam surface of the driven cam member and having a protrusion on the inner hole wall to be connected to the transmission shaft radial limit as a key. Each component is compactly combined, and the two ends of the compression spring are provided with swivels to maintain elastic force, so that the rotation of the driven cam member and the active cam member will not be affected.

[0008] Preferably, the outer peripheral surface of the transmission clutch sleeve has a plurality of long strip-shaped waist holes arranged at intervals along the axial direction. The transmission clutch sleeve is integrally provided with a bearing installation area at one end. An output connection end extends to the far end of the same end and the bearing installation area. The output connection end is connected to the receiving input shaft of the planetary reduction assembly. The edge of the other end of the transmission clutch sleeve has an inner shrinkage with a diameter that decreases inward. On the inner wall of the inner shrinkage, a plurality of connection blocks are fixedly arranged at equal intervals. The side of the connection block away from the inner wall of the inner shrinkage is an arc surface, and the end facing the inside of the transmission clutch sleeve has an extended section. The shape of the extended section tends to gradually decrease, and there are two avoidance notches on the arc surface of the extended section. The output connection end provided by the transmission clutch sleeve completes the connection so that the transmission clutch sleeve can be fixed in the axial direction. The provided connection block is used for engagement. The shape of the extended section tends to gradually decrease, so that it is easier to enter during engagement.

[0009] Preferably, a section of the transmission shaft facing the inner contraction has a positioning connection groove, and the other end is sleeved with a bearing. The positioning connection groove is used to radially fix the active cam member, and the bearing rotatably mounts the transmission shaft and the transmission clutch sleeve.

[0010] Preferably, the circumference of the reel has a plurality of spaced oblique waist holes, and the outer circumference of the driven cam has a plurality of spaced insertion holes. The oblique waist holes and the insertion holes are used for switching the transmission mode, which is simple and practical.

[0011] Preferably, the spring rear swivel, the spring front swivel and the compression spring are all located inside the transmission clutch sleeve, and the axial fixed ring seat is installed against the inner bottom wall of the transmission clutch sleeve on the side facing the bearing installation area.

[0012] Preferably, the clutch device also includes a retaining ring at the flat end of the active cam member, which is fixedly connected to the transmission shaft; the outer ring is sleeved on the outer periphery of the active cam member and the driven cam member, and the inner ring is fixedly connected to the transmission shaft; the spring front swivel is rotatably sleeved on the back side of the cam side of the driven cam member.

[0013] Preferably, the cam surfaces of the active cam member and the driven cam member are in opposing contact after assembly, and the cam surfaces have the same shape and size. The cam surface as a whole is composed of two sections of relatively gentle slope surfaces connected to two sections of relatively steep slope surfaces, the relatively gentle slope surface is the long slope surface, and the relatively steep slope surface is the short slope surface. The two long slope surfaces on the active cam member are the first slope surface, and the short slope surface is the second slope surface, and the two long slope surfaces on the driven cam member are the third slope surface, and the short slope surface is the fourth slope surface; the active cam member and the driven cam member have the same outer diameter, and raised resistance portions are provided on the outer circumferential surfaces corresponding to the intersection of the long slope surfaces and the short slope surfaces, the resistance portion of the active cam member is the raised resistance portion of the active wheel, and the resistance portion of the driven cam member is the raised resistance portion of the driven wheel.

[0014] Preferably, one end of the drive connecting sleeve is an internal spline structure and the other end is a sleeve structure. The two side walls of the inner hole of the sleeve structure have a raised pushing structure. One end of the internal spline is fixedly connected to the output shaft of the hydraulic drive motor. The end face of the driven cam member facing the drive connecting sleeve is provided with connecting holes that match the number, position and shape of the connecting block, and the size of the connecting holes is larger than the connecting block.

[0015] Preferably, a barrier is provided in the connection hole, the outer shape of the barrier fits the arc surface of the connection hole, one end of the barrier is hinged to the bottom surface of the connection hole, and the other end is cylindrical. The cylindrical shape is designed to increase the weight of the far end of the barrier, so that the barrier is kept in an open state under the centrifugal force when the driven cam rotates, and when the driven cam stops, the cylindrical shape can also make each barrier return to its original position one by one during the rotation process, that is, be magnetically attracted.

[0016] In summary, the present invention has the following advantages compared with the prior art:

[0017] The present invention utilizes the larger space inside the drum and designs and adds a set of clutch devices, so there are no extra parts on the appearance of the winch, and there is no need to change the overall frame. The added clutch device provides two traction modes that can be switched between each other. The switching steps need to be done manually and are performed when the traction rope is replaced. The switching is completed by the cooperation of the brake provided by the winch and the oblique waist hole set on the outside of the drum. The application scenarios of the two traction modes are targeted, that is, the nylon rope is used for the work of traction of light objects but repeated traction by manpower. At this time, the clutch device is switched to the protection mode. In this way, if the rope traction action will stop, the nylon rope will be prevented from breaking or injuring the human body. When the wire rope is selected, it can be conveniently switched back to the continuous transmission mode in the same way. Therefore, the present invention provides users with an additional choice when using the existing winch, so that the winch can be used more safely and reasonably. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 The present invention hides the reel, and is a schematic diagram of the overall structure from another angle;

[0020] Figure 3 A full cutaway perspective view of the transmission clutch sleeve;

[0021] Figure 4 It is an exploded view of the parts of the clutch device;

[0022] Figure 5 It is a structural schematic diagram of the continuous transmission mode after the driving connecting sleeve part of the clutch device is cut away;

[0023] Figure 6 The schematic diagram of the state structure of the clutch device during the transition from the continuous transmission mode to the protection mode after the driving connection sleeve part is cut away;

[0024] Figure 7 It is a schematic diagram of the structure of the protection mode after the driving connecting sleeve part of the clutch device is cut away;

[0025] Figure 8 for Figure 4 A partial enlarged view of the middle A;

[0026] Fig. 9 It is a dynamic structural schematic diagram of the driven cam member and the active cam member about to be combined;

[0027] Fig.10 The present invention is a schematic structural diagram after the traction rope is hidden and the drum is moved out.

[0028] Markings in the figure:

[0029] Frame 1, reel 2, oblique waist hole 21, traction rope 3, entry and exit guide 4, hydraulic drive motor 5, planetary reduction assembly 6, guide rope limit assembly 7, retaining ring 8, clutch device 100, transmission clutch sleeve 110, waist hole 111, bearing installation area 112, output connection end 113, input connection end 114, engagement block 615, avoidance gap 116, transmission shaft 120, positioning connection groove 121, axial fixed ring seat 130, Spring rear swivel 140, spring front swivel 150, compression spring 160, driven cam member 170, driven wheel raised abutment portion 171, third slope 172, fourth slope 173, connecting hole 174, plug hole 175, active cam member 180, active wheel raised abutment portion 181, first slope 182, second slope 183, drive connecting sleeve 190, pushing structure 191, spacer 200, brake assembly 300. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0031] Example 1

[0032] like Figure 1-2 As shown, a hydraulic winch with a limit function and switchable traction mode, the limit function means that the traction rope needs to retain a safe number of turns in the drum 2 when releasing the rope, which is an existing disclosed technology. The improvement of the hydraulic winch in this embodiment lies in two switchable traction modes, the main structure includes a frame 1, a drum 2 rotatably arranged on the frame 1 and located in the middle, a traction rope 3 wound on the drum 2 that can be retracted and released, a traction rope 3 entry and exit guide 4 fixed on the frame 1 in front of the drum 2, a traction rope 3 limiter assembly 7 fixed on the frame 1 behind the drum 2, a hydraulic drive motor 5 fixed on the frame 1 and located on one side of the drum 2 for driving the drum 2 to rotate back and forth and a planetary reduction assembly 6 on the other side, a clutch device 100 arranged inside the drum 2, and a brake assembly 300 located inside the drum 2 and on the outer periphery of the output shaft of the hydraulic drive motor 5;

[0033] The output shaft of the hydraulic drive motor 5 is coaxially connected to one end of the clutch device 100, and the other end of the clutch device 100 is coaxially connected to the input end of the planetary reduction assembly 6. The output end of the planetary reduction assembly 6 is then connected to the drum 2 through gear meshing. The overall operation is as follows: start the hydraulic drive motor 5 to reverse, manually pull out the traction rope 3, and when the rope release amount reaches the maximum allowable rope release amount (3 turns remaining), the guide rope limit assembly 7 cuts off the power of the hydraulic drive motor 5. After the traction rope 3 is connected to the traction object, the hydraulic drive motor 5 starts to rotate forward, and the power is transmitted to the planetary reduction assembly 6 through the clutch device 100. The planetary reduction assembly 6 transmits the decelerated power to the drum 2, and the drum 2 reels the traction rope 3 to achieve traction. Here, the reeling clutch device 100 can be adjusted to switch to a mode with overload protection, or it can be switched to a continuous transmission mode without overload protection. In this way, different traction ropes and different transmission modes can be selected according to different traction objects.

[0034] like Figure 4 As shown, the specific structure of the clutch device 100 is as follows: it includes a transmission clutch sleeve 110 located in the middle, a transmission shaft 120 coaxially installed in the transmission clutch sleeve 110 through a bearing, an axial fixed ring seat 130 coaxially connected to the transmission shaft 120 and rotatably connected, a spring rear swivel 140 abutting against the axial fixed ring seat 130 and rotatably matched, a spring front swivel 150 coaxially and parallelly arranged with the spring rear swivel 140 and spaced apart, and a compression spring 160 with one end fixed on the spring rear swivel 140 and the other end fixed on the spring front swivel 150, a driven cam member 170 rotatably connected to the transmission shaft 120, and an active cam member 180 contacting and matching with the cam surface of the driven cam member 170 and having a protrusion on the inner hole wall to be connected to the transmission shaft 120 in a radial limiting manner as a key;

[0035] like Figure 3As shown, the outer peripheral surface of the transmission clutch sleeve 110 has a plurality of long strip waist holes 111 arranged at intervals along the axial direction. The transmission clutch sleeve 110 is integrally provided with a bearing installation area 112 at one end thereof. At the same end, the bearing installation area 112 extends an output connection end 113 to the far end. The output connection end 113 is connected to the receiving input shaft of the planetary reduction assembly 6; the edge of the other end of the transmission clutch sleeve 110 has an inner shrinkage opening 114 with a diameter reduced inwardly, and a plurality of connection holes 114 are fixedly arranged at equal intervals on the inner wall of the inner shrinkage opening 114. Block 115, the side of the connecting block 115 away from the inner wall of the inner constriction 114 is an arc surface, and the end facing the inside of the transmission clutch sleeve 110 has an extended section, the shape of the extended section tends to gradually decrease, and there are two avoidance notches 116 on the arc surface of the extended section; a section of the transmission shaft 120 facing the inner constriction 114 has a positioning connection groove 121, and a bearing is sleeved on the other end. The transmission shaft 120 is rotatably connected to the transmission clutch sleeve 110 through the matching connection between the bearing and the bearing installation area 112.

[0036] The circumference of the reel 2 has a plurality of spaced oblique waist holes 21, and the outer circumference of the driven cam member 170 has a plurality of spaced insertion holes 175, the oblique waist holes 21 are used for an external rod to temporarily pass through and enter the waist hole 111 or for an external rod to temporarily penetrate into the insertion hole 175;

[0037] The spring rear swivel 140, the spring front swivel 150 and the compression spring 160 are all located inside the transmission clutch sleeve 110. The axial fixing ring seat 130 is installed close to the inner bottom wall of the transmission clutch sleeve 110 facing the bearing installation area 112. After installation, the axial fixing ring seat 130 is limited in the axial direction and can rotate along the axis.

[0038] The clutch device 100 also includes a retaining ring 8 fixedly connected to the transmission shaft 120 at the flat end of the active cam member 180, a driving connecting sleeve 190 with an outer ring sleeved on the outer periphery of the active cam member 180 and the driven cam member 170 and an inner ring fixedly connected to the transmission shaft 120; and a spring front swivel 150 rotatably sleeved on the back side of the cam side of the driven cam member 170.

[0039] like Figure 5-7 , Fig. 9As shown, the cam surfaces of the active cam member 180 and the driven cam member 170 are in opposing contact after being combined, and the cam surfaces have the same shape and size. The cam surface as a whole is composed of two sections of relatively gentle slope surfaces connected to two sections of relatively steep slope surfaces. For the convenience of description, the relatively gentle slope surface is defined as a long slope surface, and the relatively steep slope surface is defined as a short slope surface. The two long slope surfaces on the active cam member 180 are defined as a first slope surface 182, and the short slope surface is defined as a second slope surface 183. The two long slope surfaces on the driven cam member 170 are defined as a third slope surface 172, and the short slope surface is defined as a fourth slope surface 173. The active cam member 180 and the driven cam member 170 have the same outer diameter, and raised abutment portions are provided on the outer circumferential surfaces corresponding to the intersection of the long slope surface and the short slope surface. The abutment portion of the active cam member 180 is defined as a raised abutment portion 181 of the active wheel, and the abutment portion of the driven cam member 170 is defined as a raised abutment portion 171 of the driven wheel. One end of the drive connection sleeve 190 is an internal spline structure and the other end is a sleeve-like structure. The inner hole of the sleeve structure has a protruding push structure 191 on both sides of the diameter. One end of the internal spline is fixedly connected to the output shaft of the hydraulic drive motor 5. Figure 4 , Figure 8 As shown, the end surface of the driven cam member 170 facing the driving connecting sleeve 190 is provided with connecting holes 174 that match the number, position and shape of the connecting block 115. The size of the connecting holes 174 is slightly larger than the connecting block 115 so that the two can be more easily engaged under slow rotation.

[0040] The driving sleeve 190 and the active cam member 180 and the driven cam member 170 are driven by the way of conflict. There are two specific ways. One is as follows: Figure 5 As shown in the figure, the protruding contact part 181 of the driving wheel and the protruding contact part 171 of the driven wheel are aligned. At this time, the pushing structure 191 directly contacts the protruding contact part 181 of the driving wheel and the protruding contact part 171 of the driven wheel. Under the push of the compression spring 160, the first slope 182 and the third slope 172 are basically in full contact, and the connecting block 115 also enters the connecting hole 174. When the driving connecting sleeve 190 rotates, the transmission shaft 120, the driven cam member 170, and the driving cam member 180 are driven to rotate at the same time. This transmission mode is a continuous transmission mode, that is, the cam surface and the compression spring 160 do not work, and the connecting block 115 and the connecting hole 174 will not separate. The other is as follows Figure 7 As shown, the driving wheel raised contact portion 181 and the driven wheel raised contact portion 171 are in a separated state, and the transmission mode is a protection transmission mode. Figure 5 The state shown in the figure is switched, and after switching, it has the function of protecting the traction rope. The specific switching steps are: first use the brake assembly 300 to lock the drive connection sleeve 190, so that the active cam member 180 is also locked, and then use external force to rotate the reel 2 clockwise. At this time, the reel 2 drives the transmission clutch sleeve 110 to synchronize Figure 6As shown in the clockwise rotation, the transmission clutch sleeve 110 drives the driven cam member 170 to rotate, the second slope surface 183 and the fourth slope surface 173 collide with each other to overcome the thrust of the compression spring 160 to produce a slip, and the driven cam member 170 moves backward as a whole. Figure 6 , Fig.10 As shown in the figure, when the driven cam member 170 moves as a whole to the connection block 115 and the connection hole 174 are completely separated, the reel 2 needs to be rotated a little more to stagger the connection block 115 and the connection hole 174, and then a temporary rod is inserted from the oblique waist hole 21 of the reel 2 and enters the waist hole 111, and then it is still rotated clockwise, and another temporary rod is inserted into the insertion hole 175, and then the two temporary rods are continuously moved clockwise to make the fourth slope 173 of the driven cam member 170 break through the second slope 183, so as to reach Figure 7 In the state shown, when working in this state, if the traction rope 3 is entangled by foreign objects and the traction force increases, the connection hole 174 and the connection block 115 will be disengaged. At the moment of disengagement, the load of the driven cam member 170 immediately becomes very small, so the cam surface of the active cam member 180 is driven to rotate rapidly, and the connection hole 174 and the connection block 115 cannot be engaged under the rapid rotation, so the transmission clutch sleeve 110 stops rotating, and the corresponding reel 2 also stops, thus ensuring that the traction rope 3 is not pulled further. Similarly, if the traction rope is to be replaced and the protection transmission mode is switched to the continuous transmission mode, the switching can be completed by rotating the corresponding components in reverse order according to the above steps.

[0041] In addition, in the protection transmission mode, in order to prevent the connection block 115 from entering the connection hole 174 even when the driven cam 170 rotates at a relatively slow speed, the connection block 115 can enter the connection hole 174 when the driven cam 170 is about to stop rotating for the last one or two turns. For this purpose, a barrier 200 that is automatically opened by centrifugal force is provided in the connection hole 174. The shape of the barrier 200 fits the arc surface of the connection hole 174. One end of the barrier 200 is hinged to the bottom surface of the connection hole 174, and the other end is cylindrical as a counterweight. A magnetic stone is provided on the arc surface of the connection hole 174. When the driven cam 170 rotates rapidly, the centrifugal force will get rid of the suction of the magnetic stone so that the barrier 200 can be opened. The blocking member 200 is in an open state, and the height of the blocking member 200 is flush with the end face of the driven cam member 170. In this way, even if the connecting block 115 reaches the position of the connecting hole 174, the two will not be connected because they are blocked by the blocking member 200. In this way, the reel 2 remains stagnant and the traction rope 3 will not be pulled further. When the stop button of the hydraulic drive motor 5 is pressed, the speed of the driven cam member 170 gradually decreases, and the weight of the blocking member 200 is designed to overcome the centrifugal force and return to the initial position in the last few turns and be adsorbed by the magnetic stone. In this way, the connecting block 115 can be connected with the connecting hole 174 in the last few turns. At this time, the hydraulic drive motor 5 is also completely stopped.

[0042] The dynamic relationship among the active cam member 180, the driven cam member 170 and the transmission shaft 120 is as follows: under the action of the compression spring 160, the first slope 182 and the third slope 172 conflict with each other, and the active cam member 180 and the driven cam member 170 are in a state of balance under the action of the compression spring 160. At this time, the rotation of the active cam member 180 will drive the driven cam member 170 to rotate together, and if the driven cam member 170 is loaded under the external force, the first slope 182, the third slope 172 and the compression spring 160 will find a balance point again, that is, the contact position of the first slope 182 and the third slope 172 under the load is transferred from the low side to the high side, and the compression spring 160 is further squeezed to provide a greater reaction force, so that the friction force between the first slope 182 and the third slope 172 increases, so that after the balance, it can carry a larger load, and at this time the transmission shaft 120 is in a state of balance. The clutch sleeve 110 transmits power through the connection block 115 and the connection hole 174. When the load increases, the driven cam member 170 is displaced toward the side of the compression spring 160, that is, the depth of engagement between the connection block 115 and the connection hole 174 is decreasing. When the load increases to a certain value (or a set value), the connection block 115 will completely disengage from the connection hole 174. At this time, as mentioned above, the connection block 115 cannot immediately return to the connection hole 174, and the plane of the end surface of the connection block 115 at the connection hole 174 will briefly contact and rub. Although the connection block 115 is in a friction state, the operator is in an operating state and will immediately shut down the hydraulic drive motor 5. Therefore, the friction damage is not great. After shutting down the hydraulic drive motor 5, the connection block 115 re-enters the connection hole 174 as mentioned above to complete the reset. The overall action process achieves the purpose of controlling overload and protecting the traction rope 3.

[0043] Those skilled in the art to which the present invention relates may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A hydraulic winch with a limit function and switchable traction mode, comprising a frame (1), a drum (2) rotatably arranged on the frame (1) and located in the middle, a traction rope (3) wound on the drum (2) that can be retracted and released, a traction rope (3) entering and exiting a guide member (4) fixed to the frame (1) in front of the drum (2), a traction rope (3) limit assembly (7) fixed to the frame (1) behind the drum (2), a hydraulic drive motor (5) fixed to the frame (1) and located on one side of the drum (2) for driving the drum (2) to rotate back and forth, and a planetary reduction assembly (6) on the other side, and a brake assembly (300) located inside the drum (2) and on the outer periphery of an output shaft of the hydraulic drive motor (5), characterized in that: The hydraulic winch also includes a clutch device (100) arranged inside the drum (2); The output shaft of the hydraulic drive motor (5) is coaxially connected to one end of the clutch device (100), the other end of the clutch device (100) is coaxially connected to the input end of the planetary reduction assembly (6), and the output end of the planetary reduction assembly (6) is meshedly connected to the reel (2) via gears; during operation, the clutch device (100) is adjusted to switch to a mode with overload protection, or to switch to a continuous transmission mode without overload protection; The clutch device (100) specifically comprises a transmission clutch sleeve (110) located in the middle, a transmission shaft (120) coaxially mounted in the transmission clutch sleeve (110) via a bearing, an axial fixed ring seat (130) coaxially rotatably connected to the transmission shaft (120), a spring rear swivel (140) abutting against the axial fixed ring seat (130) and rotatably engaged, a spring front swivel (150) coaxially parallel and spaced apart from the spring rear swivel (140), and a compression spring (160) having one end fixed to the spring rear swivel (140) and the other end fixed to the spring front swivel (150), a driven cam member (170) rotatably connected to the transmission shaft (120), and an active cam member (180) contacting and engaging with the cam surface of the driven cam member (170) and having a protrusion on the inner hole wall to act as a key and connected to the transmission shaft (120) in a radial limiting manner; The clutch device (100) further comprises a retaining ring (8) fixedly connected to the transmission shaft (120) at the flat end of the active cam member (180); a driving connection sleeve (190) having an outer ring sleeved on the outer periphery of the active cam member (180) and the driven cam member (170) and an inner ring fixedly connected to the transmission shaft (120); and a spring front swivel (150) rotatably sleeved on the back side of the cam side of the driven cam member (170).

2. The hydraulic winch with a limit function and switchable traction mode according to claim 1, characterized in that: The outer peripheral surface of the transmission clutch sleeve (110) has a plurality of long strip waist holes (111) arranged at intervals along the axial direction. The transmission clutch sleeve (110) is integrally provided with a bearing installation area (112) at one end thereof. An output connection end (113) is extended from the same end and the bearing installation area (112) to the far end. The output connection end (113) is connected to the receiving input shaft of the planetary reduction assembly (6). The edge of the other end of the transmission clutch sleeve (110) has an inner shrinkage opening (114) with a diameter that decreases inwardly. A plurality of connection blocks (115) are fixedly arranged at equal intervals on the inner wall of the inner shrinkage opening (114). The connection blocks (115) have an arc surface on one side away from the inner wall of the inner shrinkage opening (114) and an extended section on one end facing the inside of the transmission clutch sleeve (110). The extended section has a gradually decreasing shape and has two avoidance notches (116) on the arc surface of the extended section.

3. The hydraulic winch with a limit function and switchable traction mode according to claim 2, characterized in that: The transmission shaft (120) has a positioning connection groove (121) at one end facing the inner shrinkage opening (114), and a bearing is sleeved at the other end.

4. The hydraulic winch with a limit function and switchable traction mode according to claim 1, characterized in that: The circumferential surface of the reel (2) has a plurality of oblique waist holes (21) arranged at intervals, and the outer circumferential surface of the driven cam member (170) has a plurality of insertion holes (175) arranged at intervals.

5. The hydraulic winch with a limit function and switchable traction mode according to claim 2, characterized in that: The spring rear swivel (140), the spring front swivel (150), and the compression spring (160) are all located inside the transmission clutch sleeve (110), and the axial fixed ring seat (130) is installed close to the inner bottom wall of the transmission clutch sleeve (110) on the side facing the bearing installation area (112).

6. The hydraulic winch with a limit function and switchable traction mode according to claim 1, characterized in that: The cam surfaces of the active cam member (180) and the driven cam member (170) are in contact with each other after being assembled. The cam surfaces have the same shape and size. The cam surface as a whole is composed of two sections of relatively slow slope surfaces connected to two sections of relatively fast slope surfaces. The relatively slow slope surface is a long slope surface, and the relatively fast slope surface is a short slope surface. The two long slope surfaces on the active cam member (180) are a first slope surface (182), and the short slope surface is a second slope surface (183). The driven cam member (1 The two long slope surfaces on the driving cam member (180) are the third slope surface (172) and the short slope surface is the fourth slope surface (173); the outer diameters of the driving cam member (180) and the driven cam member (170) are the same, and a raised abutment portion is provided on the outer circumferential surface corresponding to the intersection of the long slope surface and the short slope surface, the abutment portion of the driving cam member (180) is the driving wheel raised abutment portion (181), and the abutment portion of the driven cam member (170) is the driven wheel raised abutment portion (171).

7. The hydraulic winch with a limit function and switchable traction mode according to claim 2, characterized in that: The drive connection sleeve (190) has an internal spline structure at one end and a sleeve structure at the other end; both side walls of the inner hole of the sleeve structure having a diameter have protruding push structures (191); one end of the internal spline is fixedly connected to the output shaft of the hydraulic drive motor (5); an end surface of the driven cam member (170) facing the drive connection sleeve (190) is provided with connection holes (174) that match the number, position and shape of the connection block (115); the size of the connection holes (174) is larger than the connection block (115).

8. The hydraulic winch with a limit function and switchable traction mode according to claim 7, characterized in that: A barrier member (200) is arranged in the connection hole (174); the outer shape of the barrier member (200) fits the arc surface of the connection hole (174); one end of the barrier member (200) is hinged to the bottom surface of the connection hole (174), and the other end is columnar.

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