Electric lifter

Abstract

The invention provides an electric lifter, and belongs to the technical field of traction lifting, the electric lifter specifically comprises a frame structure, a power output mechanism and a lifting assembly, and the frame structure is made of a light material with rigidity; the power output mechanism is mounted on the frame structure; the lifting assembly is used for lifting an object so that the object can vertically move, and the wire stroking device is arranged below the winding drum, is coupled with the lifting rope and can apply acting force to the lifting rope so that the lifting rope can move; according to the lifting device, the winding drum rotates through the power output mechanism, the rotating winding drum winds the lifting rope, an object is lifted, in the process, the lifting rope is adjusted through the wire stroking block, the problem of wire twisting is avoided, meanwhile, through arrangement of the limiting assembly, the lifting rope can be limited, and the lifting rope can be conveniently lifted. And the situation that the lifting rope shakes in the wire stroking adjustment process is avoided, and then it is ensured that the object can be stably lifted.

Description

Technical Field

[0001] This invention belongs to the field of traction lifting technology, specifically relating to an electric lifting device. Background Technology

[0002] With the continuous expansion of the power grid and the increasing complexity of transmission line structures, the installation, inspection, and maintenance of power equipment have placed higher demands on high-altitude work equipment. Operations such as transmission line inspection, insulator string replacement, and ground wire repair often require tools, equipment, or personnel to be lifted to heights of tens of meters.

[0003] Currently, the lifting devices commonly used in power grid operations mostly rely on traditional lever hoists or winches. However, when using lever hoists to lift objects, the lifting speed is slow, while when using winches to lift objects, wire tangling problems are prone to occur, affecting the smooth progress of the lifting operation. Summary of the Invention

[0004] The purpose of this invention is to provide an electric lifting device that can lift objects stably and quickly, thereby improving lifting efficiency and safety.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is an electric lifting device, comprising a frame structure, a power output mechanism, and a lifting assembly. The frame structure is made of a rigid, lightweight material; the power output mechanism is mounted on the frame structure; and the lifting assembly is used to lift an object, enabling the object to move vertically. The lifting assembly includes a drum, a hoisting rope, and a winding device. The drum is connected to a power output structure, which rotates the drum. The hoisting rope is connected to the drum and can be connected to the object to be lifted. The drum can wind up the hoisting rope. The winding device is located below the drum and coupled to the hoisting rope, and can apply force to the hoisting rope to make it move.

[0006] Furthermore, it also includes a central shaft and a transmission assembly. The central shaft is connected to the output end of the power output structure, and the drum is connected to the central shaft. The transmission assembly connects the winding device to the central shaft, so that the winding device can work when the drum rotates.

[0007] Furthermore, the cable straightening device includes a drive rod and a cable straightening block. The drive rod is rotatable. The cable straightening block is connected to the drive rod and has a flat through-hole. The suspension rope passes through the cable straightening block. When the drive rod rotates, the cable straightening block can reciprocate linearly along the axial direction of the drive rod.

[0008] Furthermore, it also includes a limiting component located below the winding device and arranged vertically with the winding device and the drum, which can limit the position of the suspension rope.

[0009] Furthermore, the limiting component includes a limiting block and a guide rope sleeve. The limiting block is located below the straightening block and can move relative to the straightening block. The guide rope sleeve is disposed on the limiting block, and the lifting rope can pass through the guide rope sleeve. The guide rope sleeve is vertically aligned with the flat opening.

[0010] Furthermore, the limiting assembly also includes an extension plate, a boom, and a positioning arm. The extension plate is connected to the frame structure; the boom extends vertically and docks with the extension plate; the positioning arm is connected to the boom and is used to carry the limiting block and can move vertically.

[0011] Furthermore, a lifting device is provided below the positioning arm, which controls the vertical movement of the positioning arm, causing the positioning arm to move closer to or further away from the straightening block.

[0012] Furthermore, the limiting component also includes an auxiliary support component located between the limiting block and the straightening block, which can support and limit the suspension rope.

[0013] Furthermore, the auxiliary support assembly includes an upper support arm, a lower support arm, and a guide sleeve. The upper support arm is hinged to the cable straightening block; the lower support arm is hinged to the limiting block; the guide sleeve is hinged to the upper and lower support arms, and the lifting rope can pass through the guide sleeve. When the cable straightening block moves, the upper and lower support arms move.

[0014] Furthermore, limit claws are evenly installed on the upper and lower support arms to limit the suspension rope.

[0015] Furthermore, the guide sleeve includes a central tube and an annular component. The central tube is provided with two annular locking grooves. The annular component is fitted into the locking grooves. It is connected to the upper support arm and the lower support arm through the corresponding annular component.

[0016] Furthermore, a guide wheel assembly is provided inside the guide rope sleeve, with the guide wheel assembly located at the upper and lower ends of the guide rope sleeve, and the guide wheel assembly is coupled with the suspension rope.

[0017] Furthermore, the guide wheel assembly includes at least three transverse guide wheels, which are arranged in an array around the central axis of the guide rope sleeve, and all three transverse guide wheels are in contact with the suspension rope.

[0018] Compared with the prior art, the beneficial effects of the present invention are that the drum is rotated by the power output mechanism, and the rotating drum winds up the hoisting rope to lift the object. During this process, the hoisting rope is adjusted by the straightening block to avoid the problem of rope tangling. At the same time, the setting of the limiting component can limit the hoisting rope to prevent the hoisting rope from shaking during the straightening adjustment, thereby ensuring that the object can be lifted stably. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the transmission component structure in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the main structure of the limiting component according to Embodiment 2 of the present invention; Figure 4 This is a side view of the limiting component according to Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the auxiliary support component structure in Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the guide sleeve structure in Embodiment 2 of the present invention; Figure 7 This is a top view of the initial state of Embodiment 2 of the present invention; Figure 8 This is a schematic diagram of the movement state of the wire straightening block in Embodiment 2 of the present invention; Figure 9 This is a schematic diagram of the internal space of the wire straightening block of the present invention; 1-Base, 2-Electrical control device, 3-Drive motor, 4-Reducer, 5-Drum, 6-Support frame, 7-Central shaft, 8-Drive rod, 9-Straightening block, 10-Stop block, 11-Guide rod, 12-Reversing cavity, 13-Reversing through hole, 14-Flat through hole, 15-Shaft hole, 16-Flat through opening, 17-Extension plate, 18-Hanging arm, 19-Positioning arm, 20-Limit block, 21-Guide rope sleeve, 22-Upper support arm, 23-Lower support arm, 24-Upper docking sleeve, 25-Lower docking sleeve, 26-Central tube, 27-Ring component, 28-Micro motor, 29-Bottom support plate, 30-Push rod, 31-Drive wheel, 32-Driven wheel, 33-Transmission chain, 34-Guide hole, 35-Side extension plate. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] See Figure 1 , Figure 2 and Figure 9 As shown, an electric lifter includes a base 1, which can dock with a mounting component and is mainly used for installation and positioning. The base 1 is provided with a drive control area and a lifting area. A lifting component is provided in the lifting area, while a power output mechanism and an electric control device 2 are provided in the drive control area. The power output mechanism is connected to the lifting component. When the power output mechanism is working, it enables the lifting component to work and lift the object.

[0023] The aforementioned power output mechanism includes a drive motor 3 and a reducer 4. The reducer 4 is connected to the output shaft of the drive motor 3, and the output end of the reducer 4 is connected to the lifting assembly. When the drive motor 3 works, it enables the lifting assembly to work. The electronic control device 2 is connected to the drive motor 3. The lifting assembly, the power output structure, and the electronic control device 2 are arranged in a straight line, and the electronic control device 2 is located below the power output structure. A protective cover is provided in the drive control area. The electronic control device 2 and the battery are both covered by the protective cover, and the drive motor 3 is mounted on the protective cover. The electronic control device 2 acts as a feedback device for the industrial remote controller. It processes the signals transmitted by the remote controller and transmits the signals to the drive motor 3, so that the drive motor 3 can perform relevant actions to realize the remote control function of the remote controller.

[0024] The working process of the remote control and drive signal transmission is as follows: When lifting a heavy object, first, press the start button on the remote control to power the entire circuit. The electronic control device 2 includes a relay, which is connected to the external brake module and the lifting control module. The external brake module is connected to a brake assembly, which is installed on the lifting assembly. Then, press the up button on the remote control to activate the relay of the external brake module, releasing the brake assembly from its locked state. The lifting control module sends a signal to the drive motor 3, causing the drive motor 3 to start working, which in turn causes the lifting assembly to work and begin lifting the heavy object. When the up button is released, a control signal is sent to the external brake module, locking the brake assembly. At this time, pressing the up or down button on the remote control again releases the external brake module, allowing the lifting to proceed according to the predetermined instructions.

[0025] The aforementioned lifting assembly includes a drum 5 and a winding device. Both ends of the drum 5 are connected to support frames 6, which are fixed within the lifting area of ​​the base 1. One support frame 6 is closer to the power output mechanism, and the other support frame 6 is farther away from the power output mechanism. The winding device is connected between the two support frames 6. A central shaft 7 passes through the drum 5, and the central shaft 7 is connected to the drum 5 through an expansion sleeve. The central shaft 7 is also connected to the output end of the reducer 4. A brake assembly is mounted on the support frame 6 and can be coupled to the central shaft 7. A transmission assembly is connected between the central shaft 7 and the winding device. When the drive motor 3 is working, the winding device is driven to work through the transmission assembly.

[0026] The above-mentioned cable straightening device includes a drive rod 8 and a cable straightening block 9. The cable straightening block 9 is connected to the drive rod 8. When the drive rod 8 rotates, it can drive the cable straightening block 9 to perform linear reciprocating motion along the axis of the drive rod 8. Specifically, the cable straightening block 9 is provided with a flat through hole 14, and a guide plate is installed in the flat through hole 14. At this time, the surface of the drive rod 8 is provided with a guide groove. The drive rod 8 passes through the flat through hole 14 on the cable straightening block 9. The guide plate is coupled with the guide groove. The cable straightening block 9 can be moved by the rotation of the drive rod 8.

[0027] A stop block 10 is provided on the inner side of both support frames 6. When the cable winding block 9 moves along the axial direction of the drive rod 8 and finally contacts the stop block 10, the cable winding block 9 can move in the opposite direction as the drive rod 8 continues to rotate. A guide rod 11 is also provided between the two support frames 6. The guide rod 11 is parallel to the drive rod 8. A guide hole 34 is provided on the cable straightening block 9. The guide rod 11 passes through the guide hole 34, so that the cable straightening block 9 can move on the guide rod 11.

[0028] A reversing cavity 12 is provided in the above-mentioned winding block 9. The reversing cavity 12 is located above the flat through hole 14. A reversing through hole 13 is provided on the winding block 9. The reversing through hole 13 is parallel to the flat through hole 14 and passes through the reversing cavity 12. A shaft hole 15 is connected between the reversing cavity 12 and the flat through hole 14. A rotating shaft passes through the shaft hole 15. The lower end of the rotating shaft is fixed to the guide plate. A steering gear is fixed to the upper end of the rotating shaft. The steering gear is located in the reversing cavity 12. A reversing guide post passes through the reversing through hole 13. The length of the reversing guide post is greater than the length of the reversing through hole 13. A central opening is provided on the reversing guide post. The central opening is long and narrow. A tooth is provided on the inner side wall of the central opening. The steering gear is located in the central opening and meshes with the tooth. When the reversing guide post moves axially, it can make the rotating shaft rotate, thereby driving the guide plate to flip. When the cable winding block 9 moves axially along the drive rod 8, the end of the reversing guide column contacts the stop block 10, and then the cable winding block 9 continues to move in that direction, the cable winding block 9 and the reversing guide column can move relative to each other, causing the guide plate to flip.

[0029] To ensure the stability of the guide plate, two magnetic rings are installed inside the reversing through hole 13. The two magnetic rings are located near the two ends of the reversing through hole 13. At the same time, a magnetic positioning part is provided on the reversing guide post. The magnetic positioning part can cooperate with the magnetic ring, but the straight-line distance between the two magnetic positioning parts is greater than the straight-line distance between the two magnetic rings. That is, when one magnetic positioning part cooperates with the magnetic ring, the other magnetic positioning part is misaligned with the other magnetic ring. This makes the guide plate more stable.

[0030] The aforementioned guide groove includes a left-hand threaded groove and a right-hand threaded groove. Both the left-hand threaded groove and the right-hand threaded groove extend spirally along the axial direction of the drive rod 8. However, the left-hand threaded groove and the right-hand threaded groove form several intersection points. When the guide plate moves in different threaded grooves, the moving direction of the winding block 9 changes. At this time, the drive rod 8 is a reciprocating screw.

[0031] A positioning device is provided on the aforementioned drum 5. The positioning device is used to connect the hoisting rope to the drum 5. Then, by rotating the drum 5, the hoisting rope is wound up. The hoisting rope passes through the winding block 9. The lower end of the hoisting rope can be connected to the object to be lifted. Thus, the object can be lifted by rotating the drum 5. The positioning device can be a ring sleeve or bolt assembly, etc. Its main function is to lock the end of the hoisting rope after being connected to the drum 5.

[0032] The aforementioned winding block 9 is provided with a flat through-hole 16, and a longitudinal guide wheel is provided in the flat through-hole 16. There are two longitudinal guide wheels and there is a gap between the two longitudinal guide wheels. The central axis 7 of each longitudinal guide wheel is set vertically. The lifting rope passes between the two longitudinal guide wheels, which helps the movement of the lifting rope. At this time, the winding device and the drum 5 are arranged vertically. The drum 5 is located above the winding device, and the object being lifted is located below the winding device.

[0033] However, when the drive motor 3 is working, it drives the line straightening device to work. At this time, the line straightening block 9 moves linearly back and forth along the axial direction of the drive rod 8. During the movement of the line straightening block 9, it can apply force to the lifting rope. Therefore, the object being lifted connected to the lower end of the lifting rope will also swing. As a result, the stability of the object is poor during the lifting process, which can easily cause it to detach or collide with surrounding buildings.

[0034] Therefore, in Embodiment 2 of this application, see Figure 3 and Figure 4As shown, a limiting component is installed on the base 1. The limiting component is located below the straightening device. By setting the limiting component, the object can move stably upward during the lifting process.

[0035] The limiting assembly includes an extension plate 17, which is aligned with the lifting area on the base 1. Two end supports are provided on the extension plate 17. The end supports are plate-shaped, and each end support is connected to a vertically extending boom 18. A positioning arm 19 is connected between the two booms 18. A limiting block 20 is installed on the positioning arm 19. The limiting block 20 can move along the length direction of the positioning arm 19. A positioning groove is provided on the positioning arm 19, which extends along the length direction of the positioning arm 19. A locking rod is provided on the limiting block 20. After the locking rod is activated, it can cooperate with the positioning arm 19 to lock the position of the limiting block 20. Specifically, the locking rod is a threaded rod, and a side extension plate 35 is provided on the limiting block 20. The side extension plate 35 is provided with a threaded hole. The threaded rod is connected to the side extension plate 35 through the threaded hole. When the threaded rod is screwed, the lower end of the threaded rod abuts against the bottom surface of the positioning groove. As the threaded rod is gradually tightened, the limiting block 20 can be positioned.

[0036] A guide rope sleeve 21 is provided on the aforementioned limiting block 20. The guide rope sleeve 21 is vertically arranged, and its central axis 7 extends vertically. The hoisting rope can pass through the guide rope sleeve 21. A guide wheel assembly is provided inside the guide rope sleeve 21. The guide wheel assembly is located at the upper and lower ends of the guide rope sleeve 21. Each guide wheel assembly includes at least three transverse guide wheels. The three transverse guide wheels are arranged in an array around the central axis 7 of the guide rope sleeve 21. At this time, the guide rope sleeve 21 is vertically aligned with the flat through-hole 16, and the three transverse guide wheels are in contact with the hoisting rope.

[0037] In order to ensure that the object can move stably during the lifting process, an auxiliary support component is connected between the limit block 20 and the straightening block 9. During implementation, the hoisting rope passes through the auxiliary support component, and the auxiliary support component applies a lateral support force to the hoisting rope.

[0038] See Figures 5 to 8 As shown, the auxiliary support assembly includes an upper support arm 22 and a lower support arm 23, which are connected by a guide sleeve. Specifically, the outer end of the upper support arm 22 is hinged to the guide sleeve, and the outer end of the lower support arm 23 is also hinged to the guide sleeve, placing the upper support arm 22 above the lower support arm 23. The inner end of the upper support arm 22 is hinged to the line straightening block 9, and the inner end of the lower support arm 23 is hinged to the limiting block 20. Several limiting claws are provided on both the upper support arm 22 and the lower support arm 23, arranged along the length of the arm. When the lifting rope passes through the auxiliary support assembly, the limiting claws limit the rope, preventing it from separating from the auxiliary support assembly.

[0039] Both the upper support arm 22 and the lower support arm 23 can rotate. Specifically, an upper connecting sleeve 24 is fixed to the inner end of the upper support arm 22. The upper connecting sleeve 24 is connected to the winding block 9, allowing the upper connecting sleeve 24 to rotate, but it cannot be separated from the winding block 9. For example, a blind channel is provided on the winding block 9, and an annular groove is provided on the inner wall of the blind channel. An anti-detachment washer is fixed on the outer circumference of the upper connecting sleeve 24. The anti-detachment washer is located in the annular groove, thus enabling the upper connecting sleeve 24 to rotate. A rope inlet is provided on the upper connecting sleeve 24, and the rope inlet is close to the lower end of the upper connecting sleeve 24. The lower support arm 23 has a lower connecting sleeve 25 fixed to its inner end. The lower connecting sleeve 25 is connected to the limiting block 20 in the same way, but the rope inlet on the lower connecting sleeve 25 is closer to the upper end.

[0040] The aforementioned guide sleeve includes a central tube 26 through which the suspension rope can pass. Two annular locking grooves are provided on the central tube 26, and an annular component 27 is fitted into each locking groove. The annular component 27 is provided with an ear plate. The two annular components 27 are respectively connected to the upper support arm 22 and the lower support arm 23, so that the angle between the upper support arm 22 and the lower support arm 23 can be changed, allowing the cable straightening block 9 and the limiting block 20 to move relative to each other in the horizontal direction.

[0041] When the straightening block 9 moves relative to the limiting block 20, the limiting block 20 remains stationary. The straightening block 9 moves above the limiting block 20. When the straightening block 9 moves, the upper support arm 22 swings, and the lower support arm 23 swings accordingly. Specifically, a placement groove is provided on the upper part of the limiting block 20, and a micro motor 28 is installed in the placement groove. An external gear ring is provided on the lower docking sleeve 25. The placement groove is connected to a transmission channel, and a transmission pinion is provided in the transmission channel. At the same time, a drive gear is installed at the output end of the micro motor 28. The transmission pinion meshes with the drive gear and the external gear ring. When the micro motor 28 works, it can make the external gear ring rotate, thereby making the lower docking sleeve 25 rotate, so as to control the swing of the lower support arm 23. The aforementioned swing motor is connected to a sensor, which is mounted on the positioning arm 19. There are two sensors, and the limit block 20 is installed between the two sensors. A trigger is set on the winding block 9. When the trigger moves above the sensor, the sensor can send a control signal to adjust the rotation direction of the output shaft of the micro motor 28. The micro motor 28 and the drive motor 3 work simultaneously. When the drive motor 3 works, it can make the winding block 9 translate. During this process, the upper support arm 22 swings. At this time, the lower support arm 23 is controlled to swing by the micro motor 28. The aforementioned positioning arm 19 is connected to a lifting device located below the positioning arm 19. When the lifting device is working, it enables the positioning arm 19 to move vertically. The lifting device specifically includes a base plate 29 located below the positioning arm 19. A telescopic push rod 30 is installed on the base plate 29. The upper end of the push rod 30 is connected to the positioning arm 19. At this time, longitudinal channels are provided at both ends of the positioning arm 19. The boom 18 passes through the longitudinal channels. By extending or shortening the push rod 30, the positioning arm 19 can move longitudinally. Initially, the straightening block 9 and the limiting block 20 are aligned, both on the same vertical line. At this time, the push rod 30 is in a retracted state, making the angle between the upper support arm 22 and the lower support arm 23 between 160-170°, approaching a vertical state. When it is necessary to lift the object, the push rod 30 is extended first, causing the positioning arm 19 to move upward. The positioning arm 19 gradually approaches the drive rod 8, causing the upper support arm 22 and the lower support arm 23 to begin to rotate. At this time, the angle between the upper support arm 22 and the lower support arm 23 gradually decreases, but must not be less than 45°. Then, the drive motor 3 works, causing the drum 5 to wind up the lifting rope, allowing the object at the lower end of the rope to move upward. During the lifting process, as the straightening block 9 makes reciprocating linear motion, the upper support arm 22 and the lower support arm 23 swing, thereby stabilizing the lifting of the object.

[0042] After lifting the object, when the drum 5 needs to perform the line release action, the control push rod 30 retracts, causing the positioning arm 19 to move away from the line-straightening block 9, so that the upper support arm 22 and the lower support arm 23 gradually return to their initial state. Then, by performing the line release action through the drum 5, the hoisting rope can move smoothly downwards to facilitate repeated lifting actions.

[0043] Finally, the transmission assembly in this application includes a drive wheel 31 and a driven wheel 32. The drive wheel 31 is connected to the central shaft 7, and the driven wheel 32 is connected to the drive rod 8. The drive wheel 31 is connected to the driven wheel 32 through the transmission chain 33. In this way, when the drum 5 rotates, the drive rod 8 can rotate, so that the rope can be straightened by the straightening block 9 during the lifting of the object. The base 1, drum 5, support frame 6 and other frame structures in this technical solution are all made of high-strength aluminum alloy, carbon fiber composite materials and other materials, which reduces the overall weight.

[0044] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric lifting device for lifting objects, characterized in that, include: Framework structure; The power take-off mechanism is mounted on the frame structure; Lift the component to enable the object to move vertically; The lifting component includes: The drum (5) is connected to the power output structure, and the drum (5) is rotated through the power output structure; The hoisting rope is connected to the drum (5) and can be connected to the object to be lifted. The drum (5) can wind up the hoisting rope. The cable winding device is located below the drum (5) and coupled to the suspension rope, and can apply force to the suspension rope to make the suspension rope move.

2. The electric lifting device according to claim 1, characterized in that, Also includes: The central shaft (7) is connected to the output end of the power output structure, and the drum (5) is connected to the central shaft (7); The transmission assembly connects the winding device to the central shaft (7), enabling the winding device to operate when the drum (5) rotates.

3. The electric lifting device according to claim 1 or 2, characterized in that, The wire straightening device includes: Drive rod (8) is capable of rotation; A wire-strapping block (9) is connected to a drive rod (8). The wire-strapping block (9) has a flat through-hole (16). The suspension rope passes through the wire-strapping block (9). When the drive rod (8) rotates, the wire-strapping block (9) can reciprocate linearly along the axis of the drive rod (8).

4. The electric lifting device according to claim 1, characterized in that, It also includes a limiting component located below the winding device and arranged vertically with the winding device and the drum (5), which can limit the position of the rope.

5. The electric lifting device according to claim 4, characterized in that, The limiting component includes: The limiting block (20) is located below the straightening block (9) and can move relative to the straightening block (9); A guide rope sleeve (21) is provided on the limiting block (20), and the lifting rope can pass through the guide rope sleeve (21); The guide rope sleeve (21) is vertically aligned with the flat opening (16).

6. The electric lifting device according to claim 5, characterized in that, The limiting component also includes: Extension plate (17) is connected to the frame structure; The boom (18) extends vertically and docks with the extension plate (17); The positioning arm (19), connected to the boom (18), is used to carry the limiting block (20) and can move vertically.

7. The electric lifting device according to claim 6, characterized in that, A lifting device is provided below the positioning arm (19). The positioning arm (19) is controlled to move vertically by the lifting device, so that the positioning arm (19) moves towards or away from the straightening block (9).

8. The electric lifting device according to claim 5, characterized in that, The limiting component also includes: The auxiliary support component, located between the limiting block (20) and the straightening block (9), can support and limit the suspension rope.

9. The electric lifting device according to claim 8, characterized in that, The auxiliary support components include: The upper support arm (22) is hinged to the wire straightening block (9); The lower support arm (23) is hinged to the limiting block (20); The guide sleeve is hinged to the upper support arm (22) and the lower support arm (23), and the hoisting rope can pass through the guide sleeve. When the wire-straightening block (9) moves, the upper support arm (22) and the lower support arm (23) move.

10. The electric lifting device according to claim 9, characterized in that, Limiting claws are evenly provided on the upper support arm (22) and the lower support arm (23), and the limiting claws limit the suspension rope.

11. The electric lifting device according to claim 9, characterized in that, The guide sleeve includes: The central tube (26) has two annular slots. The annular part (27) is fitted into the slot; It is connected to the upper support arm (22) and the lower support arm (23) by the corresponding ring part (27).

12. The electric lifting device according to claim 11, characterized in that, The guide rope sleeve (21) is provided with a guide wheel assembly, which is located at the upper and lower ends of the guide rope sleeve (21) and is coupled with the suspension rope.

13. The electric lifting device according to claim 12, characterized in that, The guide wheel assembly includes at least three transverse guide wheels, which are arranged in an array around the central axis (7) of the guide rope sleeve (21), and all three transverse guide wheels are in contact with the suspension rope.

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