A stroke limiting mechanism for a hoist

Abstract

The present application relates to the technical field of limiting mechanism, and in particular to a stroke limiting mechanism of lifting device, and solves the problems that the winding rope is easily stuck at the top end and easily reversed after being used up. To solve the above problems, the present application provides a stroke limiting mechanism of lifting device, which comprises a lifting device body and a stroke limiting mechanism. The lifting device body comprises a drum for winding the winding rope, and the drum is arranged outside the lifting device body. The stroke limiting mechanism comprises a spiral groove arranged at one end of the drum, a limiting part connected with the lifting device body, and a sliding block and two limiting switches arranged in the limiting part. At least part of the sliding block enters the spiral groove. The spiral groove is used for guiding the movement of the sliding block between the two limiting switches in the limiting part. In the process of rotating the drum, the spiral groove drives the sliding block to move in the limiting part, and the drum stops rotating when the sliding block contacts with the limiting switch.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of limiting mechanism, in particular to a stroke limiting mechanism of a lifting device. BACKGROUND

[0002] The lifting device can be used for self-rescue and rescue in harsh environments such as snow, marsh, desert, beach and muddy mountain road. There are usually two types of manual winch and electric winch. The manual winch is time-consuming and laborious in use, and the electric winch is prone to jamming or motor reverse rotation during the process of dragging the object, causing inconvenience in use of the lifting device. SUMMARY

[0003] The present application solves the problems of easy jamming at the top of the winding rope and easy reverse rotation after the winding rope is used up.

[0004] To solve the above problems, the present application provides a stroke limiting mechanism of a lifting device, which comprises a lifting device body and a stroke limiting mechanism. The lifting device body comprises a drum for winding a winding rope, and the drum is arranged outside the lifting device body. The stroke limiting mechanism comprises a spiral groove arranged at one end of the drum, a limiting part connected with the lifting device body, and a sliding block and two limiting switches arranged in the limiting part. At least part of the sliding block enters the spiral groove. The spiral groove is used for guiding the movement of the sliding block between the two limiting switches in the limiting part. During the rotation of the drum, the spiral groove drives the sliding block to move in the limiting part. When the sliding block contacts the limiting switch, the drum stops rotating.

[0005] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the cooperation of the spiral groove and the sliding block enables the drum to drive the sliding block to move while rolling. The setting of the limiting switch limits the movement range of the sliding block and makes the limiting structure simpler. After the sliding block touches the limiting switch, the motor stops moving, thereby avoiding damage to the motor caused by excessive external force.

[0006] In an embodiment of the present application, the limiting part further comprises: a shell connected with the lifting device body, the shell being provided with a mounting position, and the limiting switch being arranged in the mounting position; a connecting plate connected with the shell and arranged on the side of the shell away from the lifting device body; and a sliding rail arranged between the limiting switch and the shell. The sliding block moves in the limiting part through the sliding rail.

[0007] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the fixed connection of the shell and the lifting device body can reduce the influence of vibration during the operation of the drum. The setting of the sliding rail makes the resistance smaller during the sliding of the sliding block. The setting of the connecting plate controls the drum to stop rotating when the sliding block contacts the limiting switch, and also fixes the limiting switch in the limiting part, thereby increasing the stability of the limiting part.

[0008] In one embodiment of the present application, the sliding block has opposite first and second faces, the first face is connected with the slide rail, the second face is provided with a hollow space, the second face is flush with the side of the shell body close to the lifting device body, the first face is provided with a second protruding part, and the second protruding part enters the spiral groove.

[0009] Compared with the prior art, the technical effects achieved by adopting the technical scheme are that the position of the second protruding part in the spiral groove can be changed during the rotation of the roller, the active movement of the conventional sliding block is changed into passive movement following the roller through conversion, the limiting structure becomes simpler, the setting of the hollow space reduces the contact area of the sliding block and the slide rail, and the resistance received by the sliding block during movement is reduced.

[0010] In one embodiment of the present application, the limiting switch has a first segment and a second segment connected by bending close to one side of the lifting device body, the first segment is provided with a first protruding part, and the distance between the first segment and the lifting device body is less than the distance between the second segment and the lifting device body.

[0011] Compared with the prior art, the technical effects achieved by adopting the technical scheme are that the setting of the bending part of the first segment and the second segment plays a preliminary limiting role, and the setting of the first protruding part clearly limits the movable range of the sliding block.

[0012] In one embodiment of the present application, the installation site has two, the two installation sites are parallel and spaced apart in the shell body, one limiting switch is arranged in each installation site, the two limiting switches are reversely arranged, the second segment is flush with the plane of the shell body, the sliding block can contact the first protruding part, and the sliding block is always located between the two first protruding parts during movement.

[0013] Compared with the prior art, the technical effects achieved by adopting the technical scheme are that the first protruding parts of the two limiting switches limit the up and down positions of the sliding block, the reverse arrangement also maximizes the distance that the sliding block can move, and the space inside the limiting part is reasonably utilized.

[0014] In one embodiment of the present application, the lifting device body further comprises: a rotating part, the rotating part is arranged on the side of the lifting device body close to the limiting part and is attached to the inner surface of the roller; a bearing, the bearing is respectively attached to the rotating part and the inner surface of the roller; a driving device, the driving device is arranged in the interior of the lifting device body, and the output shaft of the driving device is connected with the rotating part.

[0015] Compared with the prior art, the technical effects achieved by adopting the technical scheme are that the driving device provides power for the work of the lifting device body, and the setting of the rotating part and the bearing makes the rotation of the roller more convenient.

[0016] In one embodiment of the present invention, the lifting device body further includes: a cover plate disposed between the roller and the limiting part, and the cover plate having a first connecting hole; and a baffle plate disposed between the cover plate and the limiting part, and the baffle plate having a second connecting hole adapted to the first connecting hole.

[0017] Compared with existing technologies, the technical effects achieved by this solution are as follows: the cover plate fixes the position of the bearing, the baffle increases the distance between the limiting part and the spiral groove, reduces the installation difficulty of the limiting part, and also makes the overall structure of the limiting part more stable, reducing the impact of vibration during motor operation.

[0018] In one embodiment of the present invention, the lifting device body further includes: an outer cover, which is disposed on both sides of the roller; and an input port, which is disposed on the outer cover on the side away from the limiting part.

[0019] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: both sides of the lifting device body are equipped with outer covers, which cover the limiting part, bearings, rotating parts and other structures, making the overall appearance of the lifting device body more aesthetically pleasing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the limiting part of the present invention cooperating with the roller;

[0022] Figure 3 This is a schematic diagram of the cooperation between the limiting part and the slider of the present invention;

[0023] Figure 4 This is a schematic diagram of the slider of the present invention;

[0024] Figure 5 for Figure 4 Rear view;

[0025] Figure 6 This is a schematic diagram of the overall structure of the limit switch;

[0026] Figure 7 for Figure 1 Rear view;

[0027] Figure 8 A schematic diagram of the internal structure of the lifting device;

[0028] Figure 9 This is a schematic diagram of the overall structure of the drum.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100-Lifting device body; 110-Roller; 111-Spiral groove; 120-Outer cover; 130-Slider; 131-First surface; 132-Second surface; 133-Second protrusion; 134-Hollow space; 140-Rotating component; 150-Bearing; 160-Drive device; 170-Cover plate; 171-First connecting hole; 180-Baffle; 181-Second connecting hole; 190-Input port; 200-Limiting part; 210-Housing; 211-Connecting plate; 220-Slide rail; 230-Limit switch; 231-First section; 232-Second section; 233-First protrusion; 240-Mounting position. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] [First Embodiment]

[0033] See Figure 1 , Figure 2 , Figure 9 In one specific embodiment, the travel limiting mechanism of the lifting device includes a lifting device body 100 and a travel limiting mechanism; the lifting device body 100 includes a roller 110 for winding a rope, the roller 110 being disposed outside the lifting device body 100; the travel limiting mechanism includes a spiral groove 111 disposed at one end of the roller 110, a limiting part 200 connected to the lifting device body 100, and a slider 130 and two limit switches 230 disposed within the limiting part 200; at least a portion of the slider 130 enters the spiral groove 111; the spiral groove 111 is used to guide the slider 130 to move between the two limit switches 230 within the limiting part 200;

[0034] During the rotation of the drum 110, the spiral groove 111 drives the slider 130 to move within the limiting part 200. When the slider 130 contacts the limit switch 230, the drum 110 stops rotating.

[0035] The drum 110 is located outside the lifting device body 100. The rope is wound around the drum 110 and is wound and unwound as the drum 110 rotates. The side of the drum 110 is provided with a spiral groove 111, which rotates with the drum 110. The upper and lower ends of the limiting part 200 are connected to the lifting device body and fixed by bolts. At this time, the gap between the limiting part 200 and the spiral groove 111 is small or in contact. The slider 130 is located inside the limiting part 200, and part of the slider 130 enters the spiral groove 111. There are usually two limit switches 230, and the slider 130 is located between the two limit switches 230.

[0036] The limiting part 200 is fixed relative to the lifting device body 100. The roller 110 is usually driven by a motor. When the roller 110 rotates, the spiral groove 111 rotates relative to the slider 130. The slider 130 moves up and down under the action of the roller 110. After the roller 110 rotates one revolution, the slider 130 rises or falls the distance between two adjacent spiral tracks on the surface of the spiral groove 111, thereby changing the position of the slider 130 relative to the roller 110. When the slider 130 contacts the limit switch 230 during movement, the slider 130 cannot continue to move, thus playing a limiting role. The limit switch 230 is electrically connected to the drive motor. After contact, the motor will also stop working to avoid damage to the motor during dragging and extend the service life of the motor.

[0037] Preferably, the roller 110 can also be driven manually.

[0038] The combination of the spiral groove 111 and the slider 130 allows the roller 110 to move the slider 130 while it is rolling. The limit switch 230 limits the range of movement of the slider 130 and simplifies the limit structure. The motor stops moving after the limit switch 230 is activated, thus preventing damage to the motor due to excessive external force.

[0039] [Second Embodiment]

[0040] See Figure 3 In one specific embodiment, the limiting part 200 further includes: a housing 210, which is connected to the lifting device body 100, and a mounting position 240 is provided on the housing 210, with the limiting switch 230 disposed in the mounting position 240; a connecting plate 211, which is connected to the housing 210 and disposed on the side of the housing 210 away from the lifting device body 100; and a slide rail 220, which is disposed between the limiting switch 230 and the housing 210; wherein the slider 130 moves within the limiting part 200 via the slide rail 220.

[0041] The housing 210 is a straight groove type, vertically arranged and connected to the lifting device body 100. The housing 210 has two through holes at the top and bottom ends, and a groove is provided near the two through holes. The fastener connects the housing 210 to the lifting device body 100 through the through holes. The slide rail 220 is located inside the housing 210. The slide rail 220 is cross-shaped and has two mounting positions 240. The mounting positions 240 are hollow. The limit switch 230 is located in the mounting position 240. A connecting plate 211 is provided on the side of the housing 210 away from the lifting device body 100. The connecting plate 211 is a PCB board and is electrically connected to the limit switch 230. The PCB board is connected and fixed to the through holes on the housing 210. When the slider 130 contacts the limit switch 230, it can control the roller 110 to stop working and also prevent the limit switch 230 from falling out of the mounting position 240.

[0042] During the rotation of the drum 110, the slider 130 moves on the slide rail 220. When the slider 130 contacts the limit switch 230, the lifting device body 100 stops working.

[0043] The fixed connection between the housing 210 and the lifting device body 100 can reduce the impact of vibration when the drum 110 is working. The slide rail 220 makes the slider 130 less resistant during sliding. The connecting plate 211 fixes the limit switch 230 inside the limit part 200, increasing the stability of the limit part 200.

[0044] [Third Embodiment]

[0045] See Figure 3 , Figure 4 , Figure 5 In one specific embodiment, the slider 130 has a first surface 131 and a second surface 132 opposite to each other. The first surface 131 is connected to the slide rail 220. The second surface 132 is provided with a hollow space 134. The second surface 132 is flush with the side of the housing 210 near the lifting device body 100. The first surface 131 is provided with a second protrusion 133, which enters the spiral groove 111.

[0046] The side of the slider 130 away from the lifting device body 100 is the first surface 131. The middle part of the second surface 132 is provided with a hollow space 134, which is usually rectangular. The side of the slider 130 is in contact with the inner surface of the housing 210. The first surface 131 is in contact with the slide rail 220. The side of the slider 130 closer to the lifting device body 100 is the second surface 132. The distance from the side of the housing 210 closer to the lifting device body 100 to the surface of the slide rail 220 is the same as the distance between the first surface 131 and the second surface 132. The second protrusion 133 is provided on the second surface 132 and extends toward the roller 110. The second protrusion 133 is arc-shaped, and its curvature is consistent with the curvature of the contact position between the spiral groove 111 and the limiting part 200, ensuring that the second protrusion 133 can enter the spiral groove 111.

[0047] The housing 210 is fixed to the lifting device body 100. During the rotation of the drum 110, the spiral groove 111 rotates with the drum 110. The second protrusion 133 is subjected to a clockwise or counterclockwise force under the action of the spiral groove 111. However, because the housing 210 is fixed, the second protrusion 133 cannot rotate in the spiral groove 111 and is finally squeezed into the adjacent spiral track. The position of the slider 130 also changes with the change of the second protrusion 133. When the drum 110 rotates clockwise, the position of the slider 130 gradually rises in the vertical direction. When the drum 110 rotates counterclockwise, the position of the slider 130 gradually falls in the vertical direction. When the slider 130 contacts the limit switch 230, the lifting device body 100 stops working.

[0048] During the rotation of the roller 110, the position of the second protrusion 133 in the spiral groove 111 can be changed. By changing the position, the active movement of the conventional slider 130 becomes the passive movement following the roller 110, making the limiting structure simpler. The hollow space 134 reduces the contact area between the slider 130 and the slide rail 220, and reduces the resistance encountered by the slider 130 during movement.

[0049] [Fourth Embodiment]

[0050] See Figure 6 In one specific embodiment, the limit switch 230 has a first segment 231 and a second segment 232 that are bent and connected on the side near the lifting device body 100. The first segment 231 is provided with a first protrusion 233. The distance between the first segment 231 and the lifting device body 100 is less than the distance between the second segment 232 and the lifting device body 100.

[0051] The limit switch 230 has a first section 231 and a second section 232 that are bent and connected on the side near the roller 110. The distance between the first section 231 and the connecting plate 211 is greater than the distance between the second end and the connecting plate 211. A first protrusion 233 is provided on the first end. The first protrusion 233 is a cuboid and is close to the bend. The slider 130 can contact the first protrusion 233 during movement.

[0052] When the slider 130 moves to the bend, it continues to move along the bend. At this time, the slider 130 is tilted relative to the body of the roller 110. The second protrusion 133 increases the pressure on the inner wall of the spiral groove 111, increasing the resistance to the rotation of the roller 110 and playing a preliminary limiting effect. When the slider 130 continues to move and contacts the first protrusion 233, the roller 110 stops rotating. When the roller 110 moves in the opposite direction, the bend allows the slider 130 to enter the slide rail 220 more easily and resume normal operation.

[0053] The bends at the first segment 231 and the second segment 232 serve as a preliminary limiting mechanism, while the first protrusion 233 clearly restricts the movable range of the slider 130.

[0054] [Fifth Embodiment]

[0055] In one specific embodiment, there are two mounting positions 240, which are arranged side by side and spaced apart in the housing 210. Each mounting position 240 is provided with a limit switch 230. The two limit switches 230 are arranged in opposite directions. The second segment 232 is flush with the plane of the housing 210. The slider 130 can contact the first protrusion 233. The slider 130 is always located between the two first protrusions 233 during the movement.

[0056] There are usually two mounting positions 240, and a slide rail 220 is provided between the two mounting positions 240. Each of the two mounting positions 240 is provided with a limit switch 230. The two limit switches 230 are arranged in opposite directions. This reversal is in the vertical direction, with the first end of the lower limit switch 230 facing down and the first end of the upper limit switch 230 facing up. The first segment 231 of each limit switch 230 is flush with the side of the housing 210 near the roller 110.

[0057] When the drum 110 rotates clockwise, the slider 130 rises within the slide rail 220. When the slider 130 rises to contact the first protrusion 233 of the upper limit switch 230, the drum 110 can no longer rotate clockwise, and the lifting device body 100 reaches the maximum drag force that it can withstand. When the drum 110 rotates counterclockwise, the slider 130 descends within the slide rail 220. When it descends to contact the first protrusion 233 of the lower limit switch 230, the drum 110 can no longer rotate counterclockwise, and the lifting device body 100 stops working.

[0058] Preferably, the limiting position of the lifting device body 100 can be controlled by changing the distance between the mounting positions 240, and the accuracy of the slider 130 movement can be changed by changing the size of the spiral groove 111 and the second protrusion 133.

[0059] The first protrusion 233 of the two limit switches 230 limits the vertical movement of the slider 130, and the reverse setting maximizes the distance that the slider 130 can move, making reasonable use of the space inside the limit part 200.

[0060] [Sixth Embodiment]

[0061] In one specific embodiment, the lifting device body 100 further includes: a rotating member 140, which is disposed on the side of the lifting device body 100 near the limiting part 200 and is in contact with the inner surface of the drum 110; a bearing 150, which is in contact with the inner surfaces of the rotating member 140 and the drum 110 respectively; and a driving device 160, which is disposed inside the lifting device body 100 and whose output shaft is connected to the rotating member 140.

[0062] The rotating component 140 is in contact with the inner surface of the roller 110, and the roller 110 is driven to rotate by the rotating component 140. The bearing 150 and the spiral groove 111 are located on the same side of the rotating component 140. The outer side of the bearing 150 is in contact with the inner surface of the roller 110, which facilitates the driving device 160. The driving device 160 is usually a motor. The motor is electrically connected to the limit switch 230. When the slider 130 contacts the first protrusion 233, the motor stops working.

[0063] The drive unit 160 provides power for the operation of the lifting device body 100, and the arrangement of the rotating part 140 and the bearing 150 makes the rotation of the drum 110 more convenient.

[0064] [Seventh Embodiment]

[0065] See Figure 7 , Figure 8In one specific embodiment, the lifting device body 100 further includes: a cover plate 170, which is disposed between the roller 110 and the limiting part 200, and the cover plate 170 is provided with a first connecting hole 171; and a baffle 180, which is disposed between the cover plate 170 and the limiting part 200, and the baffle 180 is provided with a second connecting hole 181 that is adapted to the first connecting hole 171.

[0066] The cover plate 170 is integrally formed with the lifting device body 100 and is located on both sides of the drum 110. The housing 210 and the cover plate 170 are fixed together by bolts. The cover plate 170 is provided with a first connecting hole 171 and a circular through hole in the middle. The size of the through hole is larger than the size of the spiral groove 111 on the side of the drum 110, ensuring that the spiral groove 111 can contact the second protrusion 133. The baffle 180 is located between the limiting part 200 and the cover plate 170. The baffle 180 is square with rounded corners at all four corners. A second connecting hole 181 that matches the first connecting hole 171 is provided at the center of the four rounded corners. Screws pass through the second connecting hole 181 and the first connecting hole 171 to fix the baffle 180 and the cover plate 170. The baffle 180 is provided with a through hole of the same size as the cover plate 170 in the middle. The outer side of the baffle 180 is smaller than the cover plate 170.

[0067] The cover plate 170 fixes the position of the bearing 150, and the baffle 180 increases the distance between the limiting part 200 and the spiral groove 111, reducing the installation difficulty of the limiting part 200 and making the overall structure of the limiting part 200 more stable, thus reducing the impact of vibration during motor operation.

[0068] [Eighth Embodiment]

[0069] In one specific embodiment, the lifting device body 100 further includes: an outer cover 120, which is disposed on both sides of the roller 110; and an input port 190, which is disposed on the outer cover 120 on the side away from the limiting part 200.

[0070] Both sides of the lifting device body 100 are provided with outer covers 120. The outer covers 120 cover the limiting part 200, bearing 150, rotating part 140 and other structures, making the overall appearance of the lifting device body 100 more beautiful. The input port 190 is located on the outer cover 120 on the side away from the limiting part 200.

[0071] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A stroke limiting mechanism for a hoisting device, characterized in that The lifting device body includes a drum for winding a rope, and the drum is arranged outside the lifting device body; the stroke limiting mechanism includes a spiral groove arranged at one end of the drum, a limiting part connected with the lifting device body, and a sliding block and two limiting switches arranged in the limiting part; at least part of the sliding block enters the spiral groove; the spiral groove is used for guiding the sliding block to move between the two limiting switches in the limiting part; In the process of rotating the drum, the spiral groove drives the sliding block to move in the limiting part, and the drum stops rotating when the sliding block contacts the limiting switch; The limiting switch has a first segment and a second segment connected by bending near one side of the lifting device body, the first segment is provided with a first protruding part, and the distance between the first segment and the lifting device body is less than the distance between the second segment and the lifting device body; The limiting switch has a first segment and a second segment connected by bending near one side of the drum, wherein the distance between the first segment and the connecting plate is greater than the distance between the second segment and the connecting plate, and the sliding block can contact the first protruding part during movement; The limiting part further comprises: a housing connected with the lifting device body, the housing is provided with a mounting position, and the limiting switch is arranged in the mounting position; a connecting plate connected with the housing and arranged on the side of the housing away from the lifting device; a slide rail arranged between the limiting switch and the housing; wherein the sliding block moves in the limiting part through the slide rail; The sliding block has opposite first and second surfaces, the first surface is connected with the slide rail, the second surface is provided with a hollow space, the second surface is flush with the side of the housing close to the lifting device body, the first surface is provided with a second protruding part, and the second protruding part enters the spiral groove.

2. The travel limiting mechanism of a hoisting device according to claim 1, characterized in that The mounting position has two, two The mounting positions are arranged side by side and spaced apart on the housing, and one limiting switch is arranged in each mounting position.

3. A travel limiter mechanism for a lifting device according to claim 2, characterised in that Two The limiting switches are arranged reversely, and the second segment is flush with the plane of the housing.

4. A travel limiter mechanism for a lifting device according to claim 3, characterised in that The sliding block can contact the first protruding part, and the sliding block is always located between the two first protruding parts during movement.

5. The travel limiter mechanism of the lifting device according to any one of claims 1 to 4, characterized in that, The lifting device body further comprises: a rotating part arranged on the side of the lifting device body close to the limiting part and attached to the inner surface of the drum; a bearing attached to the inner surface of the drum and the rotating part respectively; a driving device arranged in the interior of the lifting device body, and the output shaft of the driving device is connected with the rotating part.

6. A travel limiting mechanism for a lifting device as claimed in claim 5, wherein, The stroke limiting mechanism further comprises: a cover plate arranged between the drum and the limiting part, and the cover plate is provided with a first connecting hole; a baffle arranged between the cover plate and the limiting part, and the baffle is provided with a second connecting hole matched with the first connecting hole.

7. A travel limiter mechanism for a lifting device as claimed in claim 6, wherein The lifting device body further comprises: an outer cover arranged on both sides of the drum; An input port is provided on the outer cover at a side away from the limiting portion.

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