Heavy load AGV rudder wheel lifting device

Abstract

The application belongs to the technical field of AGV robot walking mechanism, and discloses a heavy-load AGV rudder wheel lifting device, which comprises a lifting device, a locking assembly and a supporting assembly are installed on the lifting device, the lifting device comprises a bottom plate, and a rudder wheel is rotatably connected to the bottom of the bottom plate; when the rudder wheel is lifted, the hydraulic rod is elongated to push the bottom plate to move downward, the rudder wheel is grounded to lift the vehicle body, the bottom plate is lowered to rotate the threaded sleeve along with the threaded rod to ensure stable lifting; after the rudder wheel is lifted to a preset height, the electric guide rail drives the first gear and the second gear to mesh, the threaded sleeve and the threaded rod are locked, the pressure of the hydraulic rod is released, the lifting height is stabilized, when the rudder wheel is lowered, the electric guide rail drives the gear assembly to reset and disengage, the threaded sleeve returns to a rotatable state, the hydraulic rod is retracted to drive the bottom plate and the rudder wheel to return to the original position, the oil pressure is prevented from gradually decreasing due to long-time load bearing of the hydraulic rod, and therefore the stability and reliability of the lifting height are ensured.

Description

Technical Field

[0001] This invention belongs to the technical field of AGV robot walking mechanism, specifically a heavy-duty AGV steering wheel lifting device. Background Technology

[0002] Heavy-duty AGVs, or Automated Guided Vehicles, are widely used in complex and demanding operations such as cargo transfer at ports and docks, material handling in large intelligent manufacturing workshops, large-scale wind turbine transport, and handling of heavy molds and large workpieces, thanks to their strong load-bearing capacity. The steering wheel is the core walking and steering component of a heavy-duty AGV, integrating both walking drive and turning steering functions. It is a key structure for the vehicle's load-bearing and motion execution. During operation, the steering wheel can output power to drive the vehicle body to move forward and backward smoothly, and can also independently complete the turning adjustment, ensuring flexible steering and precise positioning. Even under heavy load, it can stably complete operations such as large-scale material transfer and precise positioning, ensuring the operational efficiency and reliability of heavy cargo transportation in factories and docks.

[0003] Publication number CN218661223U discloses a heavy-duty AGV steering wheel lifting device, which mainly includes a trapezoidal lead screw pair, connecting rod, pin, roller, lead screw bearing seat, bearing mounting seat, nut mounting seat, roller guide rail, connecting rod rear support, base plate, and upper support plate; the base plate is installed on the AGV frame; the bottom connecting rod is installed at the trunnion seat of the base plate through a pin; the bearing mounting seat, roller guide rail, and connecting rod rear support are fixedly connected to form a rectangular frame; the upper rear connecting rod is connected to the connecting rod rear support through a pin; the upper front two connecting rods are connected through nut mounting seats; two rollers are fixed on both sides of the nut mounting seat and cooperate with the roller guide rail; the lead screw bearing seat is installed on the bearing mounting seat; the trapezoidal lead screw pair is installed on the nut mounting seat and cooperates with the lead screw bearing seat; the upper support plate is connected to the upper connecting rod through a pin. The steering wheel lifting device provided in this application can quickly lift the steering wheel within a small operating space by rotating the lead screw of the trapezoidal lead screw pair. It has a simple structure and is easy to maintain.

[0004] In the above-mentioned technologies, although the steering wheel can be quickly lifted in a small operating space by rotating the lead screw in the trapezoidal lead screw pair, the structure is simple and easy to maintain, the existing lifting structures generally do not have an independent mechanical self-locking structure. After the steering wheel is lifted, the hydraulic cylinder or electric cylinder needs to maintain pressure continuously. Long-term pressure maintenance can easily lead to overheating of the drive components, aging of seals, oil and air leakage, and a high probability of failure. Summary of the Invention

[0005] To address the issues raised in the background art, such as the lack of independent mechanical self-locking structures in lifting structures, which can lead to overheating of drive components and aging of seals causing oil and air leaks during long-term pressure maintenance, this invention provides a heavy-duty AGV steering wheel lifting device.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a heavy-duty AGV steering wheel lifting device, comprising a lifting device, wherein a locking component and a support component are installed on the lifting device;

[0007] The lifting device includes a base plate, a steering wheel rotatably connected to the bottom of the base plate, a hydraulic rod fixedly connected to the top of the base plate, a telescopic rod fixedly connected to the top of the steering wheel, an upper plate fixedly connected to the top of the telescopic rod and the hydraulic rod, and an electric cylinder fixedly connected to the top of the upper plate, with the output end of the electric cylinder connected to the telescopic rod.

[0008] The locking assembly includes a base fixed to the top of the base plate, a threaded sleeve rotatably connected to the top of the base, a threaded rod threadedly connected to the inner thread of the threaded sleeve, and the top of the threaded rod fixedly connected to the bottom of the upper plate. An electric guide rail is fixedly connected to the top of the base plate at the side of the base, a slide rod is slidably connected to the electric guide rail, a second gear is fixedly connected to the top of the slide rod, and a first gear is sleeved on the surface of the threaded sleeve, and the first gear meshes with the second gear.

[0009] The support assembly includes a fixed rod fixed to the top of the base plate, a movable rod slidably connected inside the fixed rod, and a second compression spring fixedly connected between the bottom end of the movable rod and the bottom end of the fixed rod.

[0010] Preferably, the fixing rod and the threaded sleeve are located diagonally on the base plate, and are staggered from the telescopic rod and the hydraulic rod.

[0011] Preferably, the inner wall of the base is provided with a sliding groove, and the bottom surface of the threaded sleeve is fitted with a slider, which engages with the sliding groove.

[0012] Preferably, the threaded sleeve has an oil cavity, and the inner wall of the oil cavity has a plurality of oil outlet holes at equal intervals.

[0013] Preferably, the inner wall of the oil chamber is fixedly connected with a plurality of first compression springs corresponding to the oil outlet holes, and a ball plug is fixedly connected to the end of the first compression spring away from the inner wall of the oil chamber, and the ball plug engages with the oil outlet hole.

[0014] Preferably, a sealing gasket is fitted on the surface of the ball plug, and the sealing gasket is in contact with the inner wall of the oil outlet hole.

[0015] Preferably, the oil cavity is filled with lubricating oil, and the threaded rod rotates and moves with the inner wall of the threaded sleeve, which in turn squeezes the ball plug in stages to open the oil outlet and release the lubricating oil.

[0016] Preferably, the fixed end of the telescopic rod and hydraulic rod is at the same height as the fixed rod and threaded sleeve, and the movable section of the telescopic rod and hydraulic rod is at the same height as the movable rod and threaded rod.

[0017] Preferably, guide protrusions are symmetrically arranged at the bottom of the outer wall of the movable rod, and the guide protrusions and guide grooves are slidably engaged to restrict the circumferential rotation of the movable rod.

[0018] Preferably, the bottom end of the threaded rod is provided with an annular limiting shoulder, and the upper opening of the threaded sleeve is provided with an inwardly turned limiting ring. The annular limiting shoulder and the inwardly turned limiting ring cooperate with each other to limit the threaded rod from extending upward out of the threaded sleeve and causing desiccation failure.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] When the steering wheel is raised, the hydraulic rod extends and pushes the base plate downward. The steering wheel touches the ground and lifts the vehicle body. The base plate descends simultaneously, causing the threaded sleeve to rotate with the threaded rod, ensuring smooth lifting. After the steering wheel rises to a preset height, the electric guide rail drives the first gear and the second gear to mesh, locking the threaded sleeve and the threaded rod, limiting the pressure on the hydraulic rod and stabilizing the lifting height. When the steering wheel is lowered, the electric guide rail drives the gear assembly to reset and disengage, the threaded sleeve returns to a rotatable state, and the hydraulic rod retracts, causing the base plate and steering wheel to return to their original positions. This prevents the hydraulic rod from gradually decreasing in oil pressure due to prolonged load, thereby ensuring the stability and reliability of the lifting height.

[0021] When the threaded rod rotates, it squeezes the lubricating oil in the oil chamber to increase the oil pressure. When the pressure exceeds the threshold, it pushes the ball plug to overcome the elastic force of the first compression spring and move backward, disengaging from the oil outlet. The lubricating oil flows out and evenly coats the surface of the threaded rod to form a lubricating film, reducing the frictional resistance between the threaded rod and the threaded sleeve, reducing the wear caused by long-term operation, extending the service life of both, and improving the convenience of equipment operation and maintenance and the overall reliability of operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the locking component of the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the threaded sleeve of the present invention;

[0025] Figure 4 For the present invention Figure 3 Schematic diagram of a local structure in the middle;

[0026] Figure 5 This is a schematic diagram of the support components of the present invention.

[0027] In the picture:

[0028] 1. Lifting device; 101. Base plate; 102. Steering wheel; 103. Upper plate; 104. Electric cylinder; 105. Telescopic rod; 106. Hydraulic rod; 2. Locking assembly; 201. Base; 202. Threaded sleeve; 203. First gear; 204. Electric guide rail; 205. Slide rod; 206. Second gear; 207. Threaded rod; 208. Oil chamber; 209. Ball plug; 210. Slider; 211. Slide groove; 212. Oil outlet; 213. First compression spring; 3. Support assembly; 301. Fixed rod; 302. Movable rod; 303. Second compression spring. Detailed Implementation

[0029] 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, and 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.

[0030] like Figures 1 to 5 As shown, the present invention provides a heavy-duty AGV steering wheel lifting device, including a lifting device 1, on which a locking component 2 and a support component 3 are installed;

[0031] The lifting device 1 includes a base plate 101, a steering wheel 102 rotatably connected to the bottom of the base plate 101, a hydraulic rod 106 fixedly connected to the top of the base plate 101, a telescopic rod 105 fixedly connected to the top of the steering wheel 102, an upper plate 103 fixedly connected to the top of the telescopic rod 105 and the hydraulic rod 106, an electric cylinder 104 fixedly connected to the top of the upper plate 103, and the output end of the electric cylinder 104 is connected to the telescopic rod 105.

[0032] The locking assembly 2 includes a base 201 fixed to the top of the base plate 101. A threaded sleeve 202 is rotatably connected to the top of the base 201. A threaded rod 207 is threadedly connected to the inner thread of the threaded sleeve 202, and the top of the threaded rod 207 is fixedly connected to the bottom of the upper plate 103. An electric guide rail 204 is fixedly connected to the top of the base plate 101 at the side of the base 201. A slide rod 205 is slidably connected to the electric guide rail 204. A second gear 206 is fixedly connected to the top of the slide rod 205. A first gear 203 is sleeved on the surface of the threaded sleeve 202, and the first gear 203 and the second gear 206 are meshed together.

[0033] The support assembly 3 includes a fixed rod 301 fixed to the top of the base plate 101, a movable rod 302 slidably connected inside the fixed rod 301, and a second compression spring 303 fixedly connected between the bottom end of the movable rod 302 and the bottom end inside the fixed rod 301.

[0034] The fixed rod 301 and the threaded sleeve 202 are located diagonally on the base plate 101, and are staggered with the telescopic rod 105 and the hydraulic rod 106. The inner wall of the base 201 is provided with a sliding groove 211, and the bottom surface of the threaded sleeve 202 is fitted with a slider 210, and the slider 210 is engaged with the sliding groove 211.

[0035] The above scheme is adopted as follows: When the steering wheel 102 needs to be lifted, the hydraulic rod 106 first extends, pushing the base plate 101 downward, so that the steering wheel 102 contacts the ground and lifts the entire AGV body. As the base plate 101 moves downward, the threaded sleeve 202 also descends and rotates synchronously with the threaded rod 207 to ensure that the lifting process is smooth. When the steering wheel 102 is lifted to the preset height, the electric guide rail 204 is activated to drive the first gear 203 to move towards the second gear 206 until the two are fully engaged. Through the engagement of the first gear 203 and the second gear 206, the threaded sleeve 202 and the threaded rod 207 are effectively limited to prevent the hydraulic rod 106 from gradually decreasing in oil pressure due to long-term load, thereby ensuring the stability and reliability of the lifting height.

[0036] When the steering wheel 102 needs to be lowered, the electric guide rail 204 will drive the slide bar 205 and the second gear 206 back to the initial position, disengaging the first gear 203 and the second gear 206, allowing the threaded sleeve 202 to resume free rotation. Then the hydraulic rod 106 retracts, driving the base plate 101 and the steering wheel 102 to move upward and return to the original position.

[0037] If the hydraulic rod 106 suddenly loses pressure during the lifting process, the base plate 101 will fall downwards. At this time, the second compression spring 303 compressed inside the fixed rod 301 will quickly rebound, pushing the movable rod 302 against the bottom of the upper plate 103, catching the falling base plate 101 and upper plate 103, effectively preventing the AGV body from continuing to fall. This mechanism can buffer the impact force caused by the loss of pressure, prevent the vehicle body from tilting or even overturning, thereby ensuring the safe operation of the entire lifting device 1.

[0038] like Figures 3 to 4 As shown, an oil cavity 208 is provided inside the threaded sleeve 202. Several oil outlet holes 212 are provided at equal intervals on the inner wall of the oil cavity 208. Several first compression springs 213 corresponding to the oil outlet holes 212 are fixedly connected to the inner wall of the oil cavity 208. A ball plug 209 is fixedly connected to one end of the first compression spring 213 away from the inner wall of the oil cavity 208, and the ball plug 209 engages with the oil outlet hole 212.

[0039] The above scheme works as follows: When the threaded rod 207 rotates, it squeezes the lubricating oil inside the oil chamber 208, causing its internal pressure to gradually increase. Once the oil pressure accumulates and exceeds a preset threshold, the pressure acts on the ball plug 209, pushing it to overcome the elastic force of the first compression spring 213 and retract backward. As the ball plug 209 moves, it gradually disengages from the originally sealed oil outlet 212, allowing the lubricating oil to flow smoothly out of the orifice. The flowing lubricating oil then evenly coats the entire surface of the threaded rod 207, forming a continuous and stable lubricating film. This automatic lubrication mechanism can effectively reduce the frictional resistance between the threaded rod 207 and the mating threaded sleeve 202, significantly reducing the wear caused by long-term friction, thereby extending the service life of the threaded rod 207 and the threaded sleeve 202. The entire process does not require manual intervention or periodic manual addition of lubricant, greatly improving the convenience and reliability of the entire device in operation and maintenance.

[0040] like Figure 3 As shown, a sealing gasket is fitted on the surface of the ball plug 209, and the sealing gasket is in contact with the inner wall of the oil outlet 212. The oil cavity 208 is filled with lubricating oil. During the rotation and movement of the threaded rod 207 and the inner wall of the threaded sleeve 202, the ball plug 209 is squeezed in stages, opening the oil outlet 212 to release the lubricating oil.

[0041] The above scheme achieves precise oil output when the threaded rod 207 adjusts the position of the oil chamber 208 by rotating. The system triggers the oil output process only when the threaded rod 207 continuously feeds and compresses the oil chamber 208, thus achieving lubrication. During periods when lubrication is not required, the first compression spring 213 immediately activates, pushing the ball plug 209 to automatically reset and re-seal the oil outlet 212. This design effectively avoids resource waste and potential leakage caused by continuous or excessive lubricant flow. Simultaneously, the sealing gasket in the system further enhances the sealing performance under blocked conditions, preventing minor lubricant leakage before the preset trigger pressure is reached. This ensures stable oil pressure accumulation until the trigger value is reached and the oil output action is accurately executed. This series of actions makes the entire lubrication process more precise and controllable, significantly reducing unnecessary oil consumption while meeting actual lubrication needs, thereby improving the practicality and operational stability of the automatic lubrication structure in practical applications.

[0042] like Figures 1 to 5As shown, the fixed ends of the telescopic rod 105 and hydraulic rod 106 are at the same height as the fixed rod 301 and threaded sleeve 202. The movable sections of the telescopic rod 105 and hydraulic rod 106 are at the same height as the movable rod 302 and threaded rod 207. Guide protrusions are symmetrically arranged at the bottom of the outer wall of the movable rod 302. The guide protrusions and guide grooves are slidably engaged to restrict the circumferential rotation of the movable rod 302. The bottom end of the threaded rod 207 is provided with an annular limiting shoulder. The upper opening of the threaded sleeve 202 is provided with an inward-turning limiting ring. The annular limiting shoulder and the inward-turning limiting ring cooperate to limit the threaded rod 207 from extending upward out of the threaded sleeve 202 and causing desiccation failure.

[0043] The above-mentioned scheme allows the telescopic rod 105 and hydraulic rod 106 to respectively form circumferential constraints on the movable rod 302 and threaded rod 207, restricting their circumferential rotation and ensuring that they can only rise and fall smoothly along the axial direction without synchronously deflecting with the threaded engagement. Simultaneously, the guide limit structure with guide protrusions and guide grooves further optimizes the movement trajectory of the movable rod 302, significantly improving the smoothness and stability of its lifting process. The bottom end of the threaded rod 207 is provided with an annular limiting shoulder, which cooperates with the inward-turning limiting ring on the inner side of the threaded sleeve 202 to form a stroke limit structure. When the threaded rod 207 is adjusted upwards to expand the lifting stroke of the steering wheel 102, it can prevent the threaded rod 207 from extending beyond the threaded sleeve 202, effectively avoiding the risk of thread breakage and component detachment, strengthening the structural safety factor of the entire lifting and adjustment mechanism, and eliminating safety hazards such as steering wheel 102 support failure and vehicle instability and tilting after the threads are disengaged.

[0044] Working principle and usage process of this invention:

[0045] First, during the operation of the heavy-duty automated guided vehicle (AGV), if it is necessary to adjust the direction of travel or pass through road bumps or various obstacles, the vehicle control system will automatically trigger the lifting operation of the steering wheel 102. After the mechanism is activated, the hydraulic rod 106 slowly and uniformly extends, pushing the base plate 101 downward. The steering wheel 102, which is fixed below the base plate 101, moves down synchronously until the steering wheel 102 is completely pressed against the ground. The hydraulic rod 106 continues to apply a pushing force, and relying on the ground support of the steering wheel 102, the entire AGV body is smoothly lifted to the standard height set by the program. During the downward movement of the base plate 101, the threaded rod 207 moves synchronously along the axial direction with the base plate 101, driving the threaded sleeve. The adaptive rotation of 202, coupled with the guide and limit coordination of the telescopic rod 105, provides bidirectional constraint on the offset, ensuring that the base plate 101 rises and falls smoothly without offset or swaying throughout the entire process. When the vehicle body is raised to the target height, the electric guide rail 204 is immediately activated, driving the slide rod 205 to feed laterally, causing the second gear 206 to precisely mesh with the first gear 203, locking the rotational freedom of the threaded sleeve 202, and fixing the current lifting stroke. This mechanical locking structure can share the long-term bearing pressure of the hydraulic rod 106, avoid the problem of height drop caused by oil leakage and oil pressure decay, and continuously maintain the vehicle body in the raised state, ensuring that the steering and obstacle crossing operations of the heavy-duty AGV are stable, safe and reliable throughout the entire process.

[0046] During the lifting operation of the steering wheel 102, if the hydraulic rod 106 experiences a sudden loss of pressure due to a broken oil pipe or oil leakage, the hydraulic support force will disappear instantly, and the base plate 101, along with the steering wheel 102 below, will fall rapidly downwards, which could easily cause the vehicle to become unbalanced. At this time, the second compression spring 303, which is pre-compressed and installed in the fixed rod 301 inside the mechanism, will release its elastic potential energy and rebound rapidly, pushing the movable rod 302 upwards and pressing it tightly against the bottom surface of the upper plate 103. This will promptly support the falling base plate 101 and the load of the entire vehicle, and the spring will act as a buffer to offset the huge impact load generated by the fall, quickly lifting and limiting the vehicle body. This effectively avoids major safety hazards such as unilateral force imbalance of the AGV, large tilting of the vehicle body, or even rollover. The passive emergency protection structure ensures the safety and operational reliability of the equipment lifting operation throughout the entire process.

[0047] When a heavy-duty AGV completes obstacle crossing and turning operations, it needs to lower the steering wheel 102 to transfer the entire vehicle load back to the original support structure of the vehicle body. To resume normal operation, the equipment will execute the steering wheel 102 lowering and reset process. First, the system controls the electric guide rail 204 to reverse, driving the slide bar 205 and the second gear 206 back to their initial positions, completely disengaging the second gear 206 from the first gear 203. This releases the mechanical locking structure of the threaded sleeve 202, allowing it to regain its free rotation capability. Then, the hydraulic system controls the hydraulic rod 106 to retract at a uniform speed, simultaneously pulling the base plate 101 and the steering wheel 102 mounted on it upwards until the steering wheel 102 is completely off the ground. The entire vehicle load returns to its original support structure, and the AGV is completely reset and restored to normal operation. The system operates in conventional straight-line and turning modes. Simultaneously, the entire lifting device 1 is equipped with an integrated automatic lubrication structure, adapting to the long-term reciprocating operation requirements of the equipment. Each axial lifting and lowering movement of the threaded rod 207 continuously compresses the lubricating oil inside the oil chamber 208, causing the oil pressure within the chamber to rise continuously. When the oil pressure exceeds a preset threshold, the high-pressure oil pushes the ball plug 209 to compress the first compression spring 213, opening the sealed oil outlet 212. The lubricating oil then automatically flows out, evenly covering the threaded contact surface of the threaded rod 207. This fully automatic lubrication structure eliminates the need for manual periodic lubrication, reducing manual maintenance workload and equipment maintenance costs. It also continuously weakens the frictional loss of the threaded pair, preventing premature wear and failure of components, effectively extending the overall service life of the lifting device 1, and ensuring long-term stable operation of the equipment.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heavy-duty AGV steering wheel lifting device, comprising a lifting device (1), characterized in that: The lifting device (1) is equipped with a locking component (2) and a support component (3). The lifting device (1) includes a base plate (101), a steering wheel (102) is rotatably connected to the bottom of the base plate (101), a hydraulic rod (106) is fixedly connected to the top of the base plate (101), a telescopic rod (105) is fixedly connected to the top of the steering wheel (102), an upper plate (103) is fixedly connected to the top of the telescopic rod (105) and the hydraulic rod (106), an electric cylinder (104) is fixedly connected to the top of the upper plate (103), and the output end of the electric cylinder (104) is connected to the telescopic rod (105); The locking assembly (2) includes a base (201) fixed to the top of the base plate (101), a threaded sleeve (202) rotatably connected to the top of the base (201), a threaded rod (207) threadedly connected to the threaded sleeve (202), and the top of the threaded rod (207) fixedly connected to the bottom of the upper plate (103). An electric guide rail (204) is fixedly connected to the top of the base plate (101) at the side of the base (201). A slide rod (205) is slidably connected to the electric guide rail (204). A second gear (206) is fixedly connected to the top of the slide rod (205). A first gear (203) is sleeved on the surface of the threaded sleeve (202), and the first gear (203) meshes with the second gear (206). The support assembly (3) includes a fixed rod (301) fixed to the top of the base plate (101), a movable rod (302) is slidably connected inside the fixed rod (301), and a second compression spring (303) is fixedly connected between the bottom end of the movable rod (302) and the bottom end inside the fixed rod (301).

2. The heavy-duty AGV steering wheel lifting device according to claim 1, characterized in that: The fixed rod (301) and the threaded sleeve (202) are located diagonally on the base plate (101) and are offset from the telescopic rod (105) and the hydraulic rod (106).

3. The heavy-duty AGV steering wheel lifting device according to claim 1, characterized in that: The inner wall of the base (201) is provided with a sliding groove (211), and the bottom surface of the threaded sleeve (202) is provided with a slider (210), and the slider (210) engages with the sliding groove (211).

4. The heavy-duty AGV steering wheel lifting device according to claim 1, characterized in that: The threaded sleeve (202) has an oil cavity (208) inside, and the inner wall of the oil cavity (208) has a plurality of oil outlet holes (212) at equal intervals.

5. The heavy-duty AGV steering wheel lifting device according to claim 4, characterized in that: The inner wall of the oil cavity (208) is fixedly connected with a plurality of first compression springs (213) corresponding to the oil outlet (212). A ball plug (209) is fixedly connected to one end of the first compression spring (213) away from the inner wall of the oil cavity (208), and the ball plug (209) engages with the oil outlet (212).

6. The heavy-duty AGV steering wheel lifting device according to claim 5, characterized in that: The ball plug (209) is fitted with a sealing gasket, and the sealing gasket is in contact with the inner wall of the oil outlet (212).

7. The heavy-duty AGV steering wheel lifting device according to claim 4, characterized in that: The oil chamber (208) is filled with lubricating oil. During the rotation and movement of the threaded rod (207) and the inner wall of the threaded sleeve (202), the ball plug (209) is squeezed in stages, and the oil outlet (212) is opened to release the lubricating oil.

8. The heavy-duty AGV steering wheel lifting device according to claim 1, characterized in that: The fixed ends of the telescopic rod (105) and hydraulic rod (106) are at the same height as the fixed rod (301) and threaded sleeve (202), and the movable sections of the telescopic rod (105) and hydraulic rod (106) are at the same height as the movable rod (302) and threaded rod (207).

9. The heavy-duty AGV steering wheel lifting device according to claim 1, characterized in that: The bottom of the outer wall of the movable rod (302) is symmetrically provided with guide protrusions, and the guide protrusions and guide grooves are slidably engaged to restrict the circumferential rotation of the movable rod (302).

10. The heavy-duty AGV steering wheel lifting device according to claim 1, characterized in that: The bottom end of the threaded rod (207) is provided with an annular limiting shoulder, and the upper opening of the threaded sleeve (202) is provided with an inward limiting ring. The annular limiting shoulder and the inward limiting ring cooperate with each other to limit the threaded rod (207) from extending upward out of the threaded sleeve (202) and causing the thread to desiccate.

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