Stroke limiter for executing mechanism of hydraulic hoisting equipment

Abstract

The invention discloses a stroke limiter for an executing mechanism of hydraulic hoisting equipment, and relates to the technical field of stroke switches, the stroke limiter comprises a winch seat, a reel, a winch, a mounting seat, a collision block, a stroke conversion mechanism and a rocker arm stroke switch, the rocker arm stroke switch is provided with a swing arm and a swing arm roller, and the swing arm roller is matched with the collision block for use; and the holding reset mechanism is arranged in the collision block and used for driving the swing arm to swing. The linear displacement stroke corresponding to rotation of the winch is converted into the linear displacement stroke of the collision block through the stroke conversion mechanism, and when the collision block makes contact with a swing arm roller of the rocker arm stroke switch, the swing arm is driven to rotate, so that the swing arm stroke switch generates an electric signal, and then the stroke limiting function on the winch is achieved; after the swing arm rotates, the holding reset mechanism drives the swing arm to reset along with the reverse movement of the collision block, so that the service life of the rocker travel switch is prolonged, and the rocker travel switch can reset reliably.

Description

Technical Field

[0001] The invention relates to the technical field of travel switches, in particular to a travel limiter for an actuator of a hydraulic lifting device. Background Art

[0002] The travel limiter (travel switch) is a commonly used low-current main control electrical appliance. It uses the collision of the moving parts of the production machinery to make its contacts move to connect or disconnect the control circuit to achieve a certain control purpose. Usually, this type of switch is used to limit the position or stroke of mechanical movement, so that the moving machinery can automatically stop, reverse, change speed or automatically reciprocate at a certain position or stroke.

[0003] General hydraulic lifting equipment is equipped with a travel limit device, which hits the swing arm of the travel limiter through the impact block, so that the swing arm drives the moving contact in the travel limiter to move, and the moving contact touches the static contact to achieve circuit connection. After the impact block moves away from the swing arm of the travel limiter, the swing arm is driven to reset by the spring inside the travel limiter, and the moving contact is driven away from the static contact, thereby achieving circuit disconnection. In the prior art, when the travel limiter is used for a long time or the working environment is relatively humid, the swing arm of the travel limiter is easily stuck and cannot be reset by itself. In addition, the moving contact may be greatly deformed, making it impossible to reset reliably, thereby affecting the normal use of the travel limiter. Therefore, a travel limiter that can be reliably reset is needed. Summary of the invention

[0004] The object of the present invention is to provide a travel limiter for a hydraulic lifting equipment actuator to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A travel limiter for an actuator of a hydraulic lifting device comprises a capstan seat of the hydraulic lifting device and a capstan rotatably connected to the capstan seat via a reel, and further comprises: A mounting seat mounted on a side surface of the capstan seat, wherein a collision block is movably connected in the mounting seat; A stroke conversion mechanism provided on the mounting seat, the stroke conversion mechanism cooperates with the reel to drive the impact block to move linearly in the mounting seat, and is used to convert the linear displacement stroke of the winch during rotation into the linear displacement stroke of the impact block in direct proportion; A rocker arm travel switch installed on the inner wall of the mounting seat, wherein the rocker arm travel switch comprises a swing arm and a swing arm roller, wherein the swing arm roller is rotatably connected to the end of the swing arm, and the swing arm roller is used in conjunction with the impact block; A holding and resetting mechanism is arranged in the collision block, and the holding and resetting mechanism is used to drive the swing arm to swing.

[0006] Through the above technical scheme, when the winch rotates, the stroke conversion mechanism converts the linear displacement stroke corresponding to the rotation of the winch into the linear displacement stroke of the impact block, and drives the impact block to move. When the impact block contacts the swing arm roller of the rocker arm stroke switch, it drives the swing arm to rotate, so that the swing arm stroke switch generates an electrical signal, thereby playing a stroke limit function for the winch. After the swing arm rotates, the holding and reset mechanism drives the swing arm to swing in the opposite direction as the impact block moves in the opposite direction, so that when the rocker arm stroke switch cannot reset itself after long-term use or in a humid working environment, the holding and reset mechanism drives the swing arm to reset, thereby extending the service life of the rocker arm stroke switch, and the rocker arm stroke switch can be reset reliably.

[0007] Furthermore, the stroke conversion mechanism includes a worm portion fixedly sleeved on the periphery of the reel, a screw rod is rotatably connected to the mounting seat, one end of the screw rod passes through the mounting seat and is fixedly sleeved with a worm wheel, the worm wheel is in meshing state with the worm portion, a nut sleeve is threadedly sleeved on the screw rod, a moving seat is fixedly sleeved on the periphery of the nut sleeve, and one end of the impact block is fixedly connected to the periphery of the moving seat.

[0008] Through the above technical solution, the capstan rotates, causing the reel and the worm part to rotate synchronously, the worm part meshes and rotates with the worm wheel, and then drives the screw rod and the nut sleeve to threadedly engage, thereby converting the rotational linear displacement stroke of the capstan into a linear motion stroke of the nut sleeve. The movement of the nut sleeve drives the impact block to move. After the impact block contacts the swing arm roller of the rocker arm travel switch, the rocker arm travel switch generates an electrical signal. At this time, the stroke of the capstan corresponds to the maximum number of rotations. The structure is simple and easy to maintain.

[0009] Furthermore, two limit blocks are fixedly connected to both sides of the outer wall of the movable seat, and a clamping space is enclosed between two adjacent limit blocks. A clamping strip is fixedly connected to the inner cavity wall of the mounting seat, and the clamping strip is clamped in the clamping space and can slide freely in the clamping space.

[0010] Through the above technical solution, the clamping strip slides in the clamping space, so that the movable seat will not rotate when the nut sleeve and the screw rod are screwed together.

[0011] Furthermore, the holding and resetting mechanism includes a holding claw hinged to one end of the impact block, the holding claw is arc-shaped toward one side of the impact block, and a driving column is passed through the other end of the impact block. The driving column slides freely in the impact block, and the driving column is connected to the holding claw through a transmission unit, so that when the driving column moves, the holding claw is synchronously driven to swing, and a lifting unit is provided in the mounting seat, and the lifting unit is used to drive the driving column to slide in the impact block.

[0012] Through the above technical scheme, when the impact block approaches the swing arm roller, the lifting unit drives the driving column to move toward the inner side of the impact block, and the transmission unit drives the holding claw to swing toward the direction of the swing arm roller, so that the holding claw gradually clamps the swing arm roller. When the impact block is away from the rocker arm travel switch, the holding claw first maintains the state of holding the swing arm roller and then releases it, so that the swing arm roller can be driven to reset in the process of holding the swing arm roller.

[0013] Furthermore, the transmission unit includes a rack segment opened on one end of the driving column that penetrates into the impact block, and a gear segment meshing with the rack segment is provided on the outer wall of the holding claw. The gear segment is coaxial with the rotation fulcrum of the holding claw on the impact block.

[0014] Through the above technical solution, when the driving column moves in the collision block, the rack segment and the gear segment will be engaged, thereby driving the holding claw to rotate.

[0015] Furthermore, the lifting unit includes a fixing plate connected to the mounting seat, a protrusion is fixedly connected to a side of the fixing plate facing the inner side of the mounting seat, an inclined surface is provided at one end of the protrusion facing away from the rocker arm travel switch, and the end of the driving column cooperates with the protrusion and the inclined surface.

[0016] Through the above technical solution, when the driving column moves in the direction of the rocker arm travel switch, the end of the driving column will begin to slide from the inclined surface to the top surface of the protrusion, thereby enabling the driving column to move in the direction of being retracted into the collision block.

[0017] Furthermore, a ball is rotatably embedded in one end of the driving column that passes through the collision block.

[0018] Through the above technical solution, the balls roll on the surfaces of the bumps and the inclined surfaces, replacing the frictional sliding between the end of the driving column and the bumps and the inclined surfaces, thereby reducing the wear on the end of the driving column.

[0019] Furthermore, one end of the driving column that penetrates into the collision block is fixedly connected with an anti-rotation pin, and the outer wall of the collision block is provided with a waist-shaped hole for the anti-rotation pin to be inserted into, and the anti-rotation pin slides freely in the waist-shaped hole.

[0020] Through the above technical solution, the anti-rotation pin slides in the waist-shaped hole, thereby limiting the driving column in the circumferential direction, thereby preventing the driving column from rotating on its own and causing the rack segment and the gear segment to be out of meshing state.

[0021] Furthermore, one end of the driving column passing through the impact block is fixedly sleeved with a stop ring, a spring is provided between the stop ring and the outer wall of the impact block, the spring sleeve is wrapped around the periphery of the driving column, and the two ends of the spring elastic force direction elastically press against the stop ring and the impact block respectively.

[0022] Through the above technical solution, when the driving column moves in the direction of being retracted into the impact block, the stop ring will move upward and compress the spring, so that the spring accumulates elastic potential energy. Then, when the impact block moves away from the rocker arm travel switch, the elastic potential energy accumulated in the spring is released, so that the driving column can move quickly toward the outside of the impact block, so that the holding claw can gradually release the holding state of the swing arm roller.

[0023] Furthermore, one end of the impact block away from the holding claw is rotatably connected to a swing plate, a hinge rod is hinged on the swing plate, and one end of the hinge rod away from the swing plate is hinged to the periphery of the stop ring.

[0024] Through the above technical scheme, when the impact block approaches the rocker arm travel switch, the rocker arm is in a reset state, and the length direction of the rocker arm is parallel to the movement direction of the impact block. If the impact block directly contacts the rocker arm roller, it may generate an impact force on the rocker arm along the movement direction of the impact block, thereby causing the axis of the rocker arm to bend and deform, affecting the reset of the rocker arm. Therefore, through the setting of the swing plate, when the end of the driving column contacts the inclined surface, the driving column will drive the stop ring to move in the direction of the impact block, and drive the stop ring to move synchronously. When the stop ring moves, it will drive the hinge rod to swing and make the rocker plate swing in the direction of the rocker arm, so that when the surface of the rocker plate contacts the rocker arm roller, the rocker plate gradually tilts, and then can drive the rocker arm roller to swing in the direction of the impact block, thereby reducing the impact force on the rocker arm roller, and improving the service life of the rocker arm. In addition, the structure is simple.

[0025] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention converts the linear displacement stroke corresponding to the rotation of the capstan into the linear displacement stroke of the impact block by the capstan rotation, and drives the impact block to move. When the impact block contacts the swing arm roller of the rocker arm stroke switch, the swing arm is driven to rotate, so that the swing arm stroke switch generates an electrical signal, thereby playing a stroke limit function for the capstan. After the swing arm rotates, the holding and resetting mechanism drives the swing arm to swing in the opposite direction with the reverse movement of the impact block, so that when the rocker arm stroke switch cannot be reset by itself in long-term use or in a humid working environment, the holding and resetting mechanism drives the swing arm to reset, thereby extending the service life of the rocker arm stroke switch, and the rocker arm stroke switch can be reliably reset; 2. In the present invention, when the collision block approaches the swing arm roller, the lifting unit drives the driving column to move toward the inner side of the collision block, and the transmission unit drives the holding claw to swing toward the swing arm roller, so that the holding claw gradually clamps the swing arm roller. When the collision block moves away from the rocker arm travel switch, the holding claw first keeps holding the swing arm roller, and then releases it, so that the swing arm roller can be driven to reset in the process of holding the swing arm roller. 3. In the present invention, when the impact block approaches the rocker arm travel switch, the rocker arm is in a reset state, and the length direction of the rocker arm is parallel to the movement direction of the impact block. If the impact block directly contacts the rocker arm roller, it may generate an impact force on the rocker arm along the movement direction of the impact block, thereby causing the axis of the rocker arm to bend and deform, affecting the reset of the rocker arm. Therefore, through the setting of the swing plate, when the end of the driving column contacts the inclined surface, the driving column will drive the stop ring to move in the direction of the impact block, and drive the stop ring to move synchronously. When the stop ring moves, it will drive the hinge rod to swing and make the rocker plate swing in the direction of the rocker arm, so that when the surface of the rocker plate contacts the rocker arm roller, the rocker plate gradually tilts, and then can drive the rocker arm roller to swing in the direction of the impact block, thereby reducing the impact force on the rocker arm roller, and improving the service life of the rocker arm. In addition, the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a travel limiter for a hydraulic lifting equipment actuator in the present invention; Figure 2 for Figure 1 A schematic diagram of the structure from another perspective; Figure 3 This is a schematic diagram of the structure after the capstan seat, capstan and reel are omitted in the present invention; Figure 4 for Figure 3 A schematic diagram of the structure from another perspective; Figure 5 for Figure 4 The structural diagram after the mounting base is omitted; Figure 6 for Figure 5 The schematic diagram of the structure after omitting the worm gear; Figure 7 for Figure 6 A schematic diagram of the structure from another perspective; Figure 8 for Figure 7 A magnified schematic diagram of the local structure at point A; Fig. 9 for Figure 7 Schematic diagram of the positional relationship after the middle part of the structure is cut open.

[0027] In the figure, the description of each reference numeral is as follows: 1. capstan seat; 2. reel; 3. capstan; 4. worm part; 5. worm wheel; 6. mounting seat; 7. lead screw; 8. clamping strip; 9. rocker arm travel switch; 10. fixed plate; 11. movable seat; 12. nut sleeve; 13. swing arm; 14. bumper; 15. limit block; 16. holding claw; 17. swing arm roller; 18. protrusion; 19. inclined plane; 20. waist-shaped hole; 21. anti-rotation pin; 22. rubber pad; 23. swing plate; 24. hinge rod; 25. stop ring; 26. spring; 27. engaging space; 28. driving column; 29. ​​ball; 30. rack segment; 31. gear segment. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1 - Fig. 9The present invention provides a technical solution: a travel limiter for a hydraulic lifting equipment actuator, comprising a capstan seat 1 of the hydraulic lifting equipment and a capstan 3 rotatably connected to the capstan seat 1 through a reel 2, the travel of the hydraulic lifting equipment actuator is the linear displacement travel corresponding to the maximum number of rotations of the capstan 3, a mounting seat 6 is screwed to the surface of the capstan seat 1 facing the capstan 3, the length direction of the mounting seat 6 is perpendicular to the axial direction of the reel 2, a worm part 4 is fixedly sleeved on the periphery of the reel 2, the worm part 4 rotates synchronously with the reel 2, and the linear speed ratio of the two is in a fixed proportional relationship with the diameters of the two, and the mounting seat 6 is rotatably connected with a screw rod 7 through an installation bearing, one end of the screw rod 7 passes through the mounting seat 6 and is fixedly sleeved with a worm wheel 5, the worm wheel 5 is in meshing state with the worm part 4, the meshing transmission ratio of the worm wheel 5 and the worm part 4 is fixed, a nut sleeve 12 is threadedly sleeved on the screw rod 7, a movable seat 11 is fixedly sleeved on the periphery of the nut sleeve 12, a collision block 14 is welded on the periphery of the movable seat 11, and the length direction of the collision block 14 is perpendicular to the axial direction of the screw rod 7, the inner cavity wall of the mounting seat 6 is screwed with a rocker arm travel switch 9, the rocker arm travel switch 9 is a more common travel switch structure at present, which includes a swing arm 13 and a swing arm roller 17, and the swing arm 1 3 is connected to the housing of the rocker arm travel switch 9 through an axis, and the rocker arm 13 is fixedly connected to the axis. Therefore, when the rocker arm 13 rotates around the axis, it will drive the moving contact in the rocker arm travel switch 9 to move, and the return spring (not shown in the figure) inside the rocker arm travel switch 9 will accumulate elastic potential energy as the rocker arm 13 rotates. Under normal circumstances, after the rocker arm 13 rotates under the action force, the return spring inside the rocker arm travel switch 9 will drive the axis of the rocker arm 13 to rotate after the action force disappears, thereby driving the rocker arm 13 to reset. In this embodiment, the (linear displacement) transmission generated by the diameter ratio of the worm portion 4 to the winding shaft 2 The dynamic ratio is fixed, and the transmission ratio of the meshing of the worm part 4 and the worm wheel 5 is fixed, so the number of rotations of the worm wheel 5 corresponding to one rotation of the capstan 3 is fixed, and the diameter ratio of the worm wheel 5 to the screw rod 7 is fixed, so that the number of rotations of the screw rod 7 driven by the worm wheel 5 is fixed, and the pitch of the screw rod 7 is fixed, so the number of rotations of the capstan 3 can be calculated by the technology in this field based on the existing technology. The pitch of the screw rod 7 is fixed, so the linear displacement stroke of the linear motion of the nut sleeve 12 driven by the screw rod 7 can be obtained based on the existing technology, and then the stroke limit of the capstan 3 is realized by the cooperation of the collision block 14 and the rocker arm stroke switch 9; Combination Figure 3 , Figure 5 , Figure 6 and Figure 7As shown, two limit blocks 15 are fixedly connected to both sides of the outer wall of the movable seat 11, and a clamping space 27 is surrounded by two adjacent limit blocks 15. A clamping strip 8 is fixedly connected to the inner wall of the mounting seat 6, and the clamping strip 8 is clamped in the clamping space 27 and slides freely in the clamping space 27. The clamping strip 8 slides in the clamping space 27, so that the movable seat 11 will not rotate when the nut sleeve 12 is screwed with the screw rod 7; Combination Figures 5 to 9 As shown, a clearance groove is provided at one end of the collision block 14 adjacent to the screw rod 7, and a holding claw 16 (such as Fig. 9 As shown), the side of the holding claw 16 facing the collision block 14 is arc-shaped, and the side of the holding claw 16 facing the collision block 14 is provided with a rubber pad 22. The other end of the collision block 14 is penetrated by a driving column 28, and the driving column 28 slides freely in the collision block 14. A rack section 30 is provided on the end of the driving column 28 that penetrates into the air avoidance groove, and a gear section 31 meshing with the rack section 30 is provided on the outer wall of the holding claw 16. The gear section 31 is coaxial with the rotation fulcrum of the holding claw 16 on the collision block 14. A fixing plate 10 is installed on the mounting seat 6, and a protrusion 18 is fixedly connected to a side of the fixing plate 10 facing the inner side of the mounting seat 6. The end of the protrusion 18 facing away from the rocker arm travel switch 9 is provided with an inclined surface 19. The setting of the inclined surface 19 enables the surface of the protrusion 18 and the fixing plate 10 to have a smooth transition. A ball 29 is rotatably embedded in the end of the driving column 28 that passes through the collision block 14, and the ball 29 is used in conjunction with the protrusion 18 and the inclined surface 19; Combination Figures 5 to 9 As shown, one end of the driving column 28 that passes through the impact block 14 is fixedly connected with an anti-rotation pin 21, and the outer wall of the impact block 14 is provided with a waist-shaped hole 20 for the anti-rotation pin 21 to be inserted, and the anti-rotation pin 21 slides freely in the waist-shaped hole 20, and the end of the driving column 28 that passes through the impact block 14 is fixedly sleeved with a stop ring 25, and a spring 26 is provided between the stop ring 25 and the outer wall of the impact block 14, and the spring 26 is sleeved around the periphery of the driving column 28, and the two ends of the spring 26 in the elastic force direction elastically press against the stop ring 25 and the impact block 14 respectively, and the end of the impact block 14 away from the holding claw 16 is rotatably connected to a swing plate 23, and a hinge rod 24 is hinged on the swing plate 23, and the end of the hinge rod 24 away from the swing plate 23 is hinged to the periphery of the stop ring 25.

[0030] Working principle of the present invention: When the reel 2 rotates, it synchronously drives the worm part 4 to rotate, and the worm part 4 is meshed with the worm wheel 5 for transmission, thereby driving the screw 7 to rotate. The rotation of the screw 7 will drive the nut sleeve 12 to move along the axial direction of the screw 7, so that the moving seat 11 and the impact block 14 move toward the direction of the rocker arm travel switch 9. In the initial state, the inside of the rocker arm travel switch 9 is in an open circuit state, and the length direction of the swing arm 13 is parallel to the axial direction of the screw 7, and the end of the swing arm 13 away from the rocker arm travel switch 9 is toward the impact block 14; When the collision block 14 approaches the rocker arm travel switch 9, the spring 26 exerts an elastic force on the stop ring 25. In the initial state, the driving column 28 extends outward from the collision block 14 to the maximum length. As the collision block 14 moves, the ball 29 rolls on the inclined surface 19 toward the inside of the collision block 14, thereby causing the driving column 28 to move toward the inside of the collision block 14. Two movement processes are simultaneously generated: 1) The rack segment 30 on the driving column 28 will mesh with the gear segment 31 of the holding claw 16 and drive the holding claw 16 to rotate downward (refer to Figure 7 or Fig. 9 ); 2) The movement of the driving column 28 drives the stop ring 25 to move toward the inner side of the collision block 14, and the swing plate 23 is in a vertical state (refer to Figure 7 or Fig. 9 ), and the distance between the swing arm roller 17 and the swing arm roller 17 is small. At the same time, the stop ring 25 compresses the spring 26, and the stop ring 25 drives the hinge rod 24 to swing, so that the hinge rod 24 drives the swing plate 23 to swing upward (reference Figure 7 or Fig. 9 ), the swing plate 23 will generate a lifting force on the swing arm roller 17, so that the swing arm roller 17 swings in the direction of the holding claw 16. When the ball 29 rolls to the highest point of the inclined surface 19, the swing arm roller 17 has rolled from the surface of the swing plate 23 to the surface of the collision block 14; As the ball 29 rolls on the inclined plane 19, the holding claw 16 also continues to swing downward. When the ball 29 rolls to a point close to the highest point of the inclined plane 19, the swing arm roller 17 will break away from the contact with the swing plate 23 and roll to the surface of the impact block 14. As the impact block 14 continues to move in the direction of the rocker arm travel switch 9, the swing arm roller 17 will roll from the lower side of the impact block 14 to the upper side and begin to enter between the holding claw 16 and the impact block 14. When the ball 29 rolls to the surface of the protrusion 18, the holding claw 16 swings downward at the maximum angle and holds the swing arm roller 17. At this time, the swing arm 13 has not swung into place, so the impact block 14 continues to move until the swing arm 13 swings into place, triggering the internal circuit of the rocker arm travel switch 9 to be connected, and the control end of the hydraulic lifting equipment will control the winch 3 to stop rotating, and the impact block 14 also stops moving at this time. When resetting, the winch 3 rotates in the opposite direction, so that the collision block 14 starts to move away from the rocker arm travel switch 9. In the initial stage of resetting, the ball 29 continues to roll on the surface of the protrusion 18, so the holding claw 16 still maintains the holding state of the swing arm roller 17, so that when the collision block 14 is reset, the holding claw 16 has a pulling force on the swing arm roller 17 in the direction of the collision block 14, thereby forcing the swing arm roller 17 and the swing arm 13 to reset. The surface of the swing arm roller 17 and the holding claw 16 are sliding friction. Therefore, during the resetting process, the swing arm roller 17 can slide on the surface of the holding claw 16 facing the collision block 14, so that the swing arm 13 can swing downward. When the ball 29 rolls from the surface of the protrusion 18 to the inclined surface 19, the elastic potential energy accumulated by the spring 26 is released, thereby causing the driving column 28 to move downward (refer to Figure 7 or Fig. 9 ), the driving column 28 drives the stop ring 25 to move, and at the same time the rack segment 30 and the gear segment 31 mesh in the opposite direction, so that the holding claw 16 swings upward and breaks away from the holding state of the swing arm roller 17, and at the same time the hinge rod 24 also swings in the opposite direction, and makes the swing plate 23 swing downward to reset. Through the above process, the swing arm 13 of the rocker arm stroke switch 9 can be reliably reset to avoid generating false signals and affecting normal use. In addition, the setting of the rubber pad 22 enables the holding claw 16 to hold the swing arm roller 17, and the rotation of the swing arm 13 causes the swing arm roller 17 to squeeze the rubber pad 22, and the rubber pad 22 produces elastic deformation, so that the swing arm roller 17 will not be locked by the holding claw 16, thereby avoiding interference with the rotation of the swing arm 13. In addition, the rubber pad 22 can also prevent the surface of the holding claw 16 from being subjected to greater extrusion and wear.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A travel limiter for an actuator of a hydraulic lifting device, comprising a capstan seat (1) of the hydraulic lifting device and a capstan (3) rotatably connected to the capstan seat (1) via a reel (2), characterized in that: Also includes: A mounting seat (6) mounted on a side surface of the capstan seat (1), wherein a collision block (14) is movably connected inside the mounting seat (6); a stroke conversion mechanism disposed on the mounting seat (6), the stroke conversion mechanism cooperating with the reel (2) to drive the impact block (14) to move linearly within the mounting seat (6), and used to convert the linear displacement stroke of the capstan (3) during rotation into the linear displacement stroke of the impact block (14) in direct proportion; a rocker arm travel switch (9) mounted on the inner wall of the mounting seat (6), the rocker arm travel switch (9) comprising a swing arm (13) and a swing arm roller (17), the swing arm roller (17) being rotatably connected to the end of the swing arm (13), and the swing arm roller (17) being used in conjunction with the impact block (14); A holding and resetting mechanism is provided in the collision block (14), and the holding and resetting mechanism is used to drive the swing arm (13) to swing.

2. The travel limiter for the hydraulic lifting equipment actuator according to claim 1, characterized in that: The stroke conversion mechanism comprises a worm portion (4) fixedly sleeved on the periphery of the winding shaft (2); a screw rod (7) is rotatably connected to the mounting seat (6); one end of the screw rod (7) passes through the mounting seat (6) and is fixedly sleeved with a worm wheel (5); the worm wheel (5) is in a meshing state with the worm portion (4); a nut sleeve (12) is threadedly sleeved on the screw rod (7); a movable seat (11) is fixedly sleeved on the periphery of the nut sleeve (12); and one end of the collision block (14) is fixedly connected to the periphery of the movable seat (11).

3. The travel limiter for the hydraulic lifting equipment actuator according to claim 2, characterized in that: Two limit blocks (15) are fixedly connected to both sides of the outer wall of the movable seat (11), and a clamping space (27) is enclosed between two adjacent limit blocks (15). A clamping strip (8) is fixedly connected to the inner cavity wall of the mounting seat (6), and the clamping strip (8) is clamped in the clamping space (27) and can slide freely in the clamping space (27).

4. The travel limiter for the hydraulic lifting equipment actuator according to claim 1, characterized in that: The holding and resetting mechanism comprises a holding claw (16) hinged to one end of the collision block (14); the holding claw (16) is arc-shaped on one side facing the collision block (14); a driving column (28) is passed through the other end of the collision block (14); the driving column (28) slides freely in the collision block (14); the driving column (28) and the holding claw (16) are connected through a transmission unit, so that when the driving column (28) moves, the holding claw (16) is synchronously driven to swing; a lifting unit is provided in the mounting seat (6); the lifting unit is used to drive the driving column (28) to slide in the collision block (14).

5. The travel limiter for the hydraulic lifting equipment actuator according to claim 4, characterized in that: The transmission unit comprises a rack segment (30) formed on one end of the drive column (28) and inserted into the impact block (14); a gear segment (31) meshing with the rack segment (30) is provided on the outer wall of the holding claw (16); the gear segment (31) is coaxial with a rotation fulcrum of the holding claw (16) on the impact block (14).

6. The travel limiter for the hydraulic lifting equipment actuator according to claim 4, characterized in that: The lifting unit comprises a fixing plate (10) connected to the mounting seat (6), a protrusion (18) being fixedly connected to a surface of the fixing plate (10) facing the inner side of the mounting seat (6), an inclined surface (19) being provided at an end of the protrusion (18) facing away from the rocker arm travel switch (9), and an end of the driving column (28) being used in conjunction with the protrusion (18) and the inclined surface (19).

7. The travel limiter for the actuator of the hydraulic lifting equipment according to claim 6, characterized in that: A ball (29) is rotatably embedded in one end of the driving column (28) that passes through the collision block (14).

8. The travel limiter for the actuator of the hydraulic lifting equipment according to claim 6, characterized in that: One end of the driving column (28) that penetrates into the collision block (14) is fixedly connected to an anti-rotation pin (21); an outer wall of the collision block (14) is provided with a waist-shaped hole (20) for the anti-rotation pin (21) to be inserted into; and the anti-rotation pin (21) is free to slide in the waist-shaped hole (20).

9. The travel limiter for the hydraulic lifting equipment actuator according to claim 6, characterized in that: One end of the driving column (28) passing through the impact block (14) is fixedly sleeved with a stop ring (25), and a spring (26) is provided between the stop ring (25) and the outer wall of the impact block (14). The spring (26) is sleeved around the periphery of the driving column (28), and the two ends of the spring (26) in the direction of elastic force elastically press against the stop ring (25) and the impact block (14) respectively.

10. The travel limiter for the actuator of the hydraulic lifting equipment according to claim 9, characterized in that: One end of the impact block (14) away from the holding claw (16) is rotatably connected to a swing plate (23), a hinge rod (24) is hinged on the swing plate (23), and one end of the hinge rod (24) away from the swing plate (23) is hinged to the periphery of the stop ring (25).

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