Labor-saving auxiliary lifter for mounting spare tire of low flat-bed trailer

Abstract

The invention relates to the technical field of lifters, and discloses a spare tire mounting labor-saving auxiliary lifter for a low flat-bed trailer, which comprises a carriage, a vertical rod arranged on the outer side of the carriage, a traction mechanism arranged at the top of the vertical rod, and a telescopic mechanism arranged at the bottom of the vertical rod and used for adjusting the coverage range of the lifter, the traction mechanism comprises a transverse rod arranged at the top of the vertical rod, a telescopic rod arranged on the inner side of the transverse rod, fixed guide rails symmetrically arranged on the inner wall of the bottom of the transverse rod, and movable guide rails symmetrically arranged on the inner wall of the bottom of the telescopic rod, wherein the transverse rod and the vertical rod are connected to form a stable support; the movable guide rail and the fixed guide rail extend in the same direction, and the support is arranged at the end, close to the vertical rod, of the transverse rod and provides a supporting point for the rotating component at the top. And by arranging the traction mechanism, a user can select two preset labor-saving modes according to actual conditions, so that the lifter has higher adaptability.

Description

Technical Field

[0001] The present invention relates to the technical field of lifters, and in particular to a labor-saving auxiliary lifter for installing a spare tire of a low-bed trailer. Background Art

[0002] The spare tire on a lowbed trailer is typically located low, often underneath or on the vehicle's exterior. Manual installation requires bending over or even crawling under the vehicle, which is both laborious and unsafe. A lifter easily raises the spare tire to the appropriate height, allowing the operator to install it while standing on the ground. This significantly reduces labor intensity, saving time and energy, and avoids lumbar muscle strain or collision injuries caused by prolonged bending over or crawling under the vehicle, thereby improving the efficiency and safety of spare tire replacement.

[0003] Traditional lifters are widely used in the field of auto repair, but due to the limitations of their structure and working principle, there are often some problems that cannot be ignored. The existing lifter structure is generally relatively fixed and has two obvious defects. First, the labor-saving component lacks adjustment function. The weight of tires of different models and seasons varies greatly, and the labor-saving component with a fixed structure cannot adapt to such changes. For heavier tires, it may still require a greater force to lift them, which limits its scope of application. Second, the length of the lifter is limited and the working coverage area cannot be adjusted. In actual use, the installation position of vehicle spare tires varies, and some positions are relatively far away. Fixed-length lifters are often difficult to reach, resulting in improper use. This not only reduces work efficiency, but may also require the use of other tools or manpower assistance, increasing the complexity and labor intensity of the operation. Summary of the Invention

[0004] In view of the problems in the prior art that the lifter cannot adjust the labor-saving component according to the tire weight and cannot adjust the working coverage area, a labor-saving auxiliary lifter for installing the spare tire of a low-bed trailer is proposed.

[0005] The purpose is to enable the lifter to select different degrees of labor-saving states according to different working conditions and to expand the working coverage.

[0006] The technical solution of the present invention is a labor-saving auxiliary lifter for installing a spare tire on a low-bed trailer, comprising a vehicle body, a vertical rod arranged outside the vehicle body, a traction mechanism arranged at the top of the vertical rod, and a telescopic mechanism arranged at the bottom of the vertical rod for adjusting the coverage range of the lifter; The traction mechanism includes a cross bar arranged at the top of the vertical bar, the cross bar and the vertical bar are connected to form a stable support, a telescopic rod arranged on the inside of the cross bar, the telescopic rod can move along the inner wall of the cross bar, a fixed guide rail symmetrically arranged on the inner wall of the bottom of the cross bar, a movable guide rail symmetrically arranged on the inner wall of the bottom of the telescopic rod, the movable guide rail and the fixed guide rail extending in the same direction, a bracket arranged on the cross bar near one end of the vertical bar, the bracket provides a support point for the rotating component at the top, a fixed pulley arranged on the side of the bracket near the car, the fixed pulley can only rotate in its original position, a winding wheel arranged on the side of the bracket away from the fixed pulley, the winding wheel can reel in or unreel after rotation, a movable pulley on the outside of the movable guide rail near the car side, and a variable pulley arranged on the top of the movable guide rail away from the car side. , a horizontal axis is arranged on the side of the movable pulley away from the car body, a connecting sleeve is arranged on the outside of the horizontal axis, the moving direction of the connecting sleeve is constrained by the connecting sleeve, a stud is arranged on the side of the variable pulley close to the connecting sleeve, the stud is threadedly connected to the connecting sleeve, a limiting plate is arranged on the side of the follower pulley away from the connecting sleeve, a limiting hole is opened on the side of the telescopic rod close to the variable pulley, the limiting plate and the limiting hole can constrain the variable pulley, a traction rope is arranged on the outside of the movable pulley, the traction rope is used to transmit the force, the two ends of the traction rope are respectively fixedly connected to the bracket and the winding wheel, respectively, hooks are respectively arranged on the side of the movable pulley and the connecting sleeve away from the vertical rod, a hanging rope is arranged on the hook outside the connecting sleeve, the spare tire is lifted by the hanging rope, and a locking unit is arranged at the top of the cross bar.

[0007] Furthermore, a rotating wheel is provided in a straight line at one end of the telescopic rod away from the vertical rod, the movable pulley is fixedly connected to the corresponding hook, the connecting sleeve is rotatably connected to the corresponding hook, and a screw hole is provided at one end of the connecting sleeve close to the stud, and the stud is threadedly connected to the screw hole.

[0008] Furthermore, the traction rope passes around the movable pulley and the fixed pulley in sequence, and finally passes around the variable position pulley and is fixedly connected to the winding wheel.

[0009] Furthermore, the locking unit includes a handle arranged on the top of the winding wheel, a ratchet group arranged at the bottom of the handle, and a toggle rod arranged on the top of the ratchet group.

[0010] Furthermore, the ratchet assembly is composed of a pawl, a ratchet and a spring. The pawl is meshed with the ratchet, the bottom of the toggle rod is fixedly connected to the pawl, the end of the spring close to the ratchet is fixedly connected to the pawl, and a short shaft is provided at the end of the spring away from the ratchet, and the top of the short shaft is fixedly connected to the cross bar.

[0011] Furthermore, the telescopic mechanism includes a sleeve arranged at the bottom of the vertical rod, a rotating cylinder arranged on the inner wall of the sleeve, a screw arranged at the top of the rotating cylinder, the top of the screw rod is rotatably connected to the telescopic rod, a driven wheel arranged at the bottom of the rotating cylinder, a driving wheel arranged at the bottom of the sleeve, a telescopic shaft arranged on the inner side of the driving wheel, a handwheel arranged on the side of the telescopic shaft away from the rotating cylinder, and a perforated plate arranged on the inner wall of the bottom of the sleeve.

[0012] Furthermore, the telescopic shaft is in the shape of a hexagonal prism, and a hexagonal hole is provided on the top of the orifice plate. After the telescopic shaft moves, it can be slidably connected with the hexagonal hole.

[0013] Furthermore, the driving wheel is provided with a diameter-changing hole along the axis, the diameter-changing hole is slidably connected to the telescopic shaft, a baffle is provided in the middle of the telescopic shaft, and the baffle abuts against the diameter-changing hole.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a traction mechanism, the user can choose different labor-saving modes according to the weight of the tire. When faced with tires of different weights, the user can choose between two preset labor-saving modes based on actual conditions. If the tire is heavier, you can choose a mode that focuses more on labor-saving efficiency to reduce your own burden. If you pursue a faster lifting speed, you can also switch to the corresponding mode. This design makes the lifter more adaptable and is no longer limited to a single operating method. Users do not need to make an absolute trade-off between labor-saving and speed, but can flexibly adjust according to specific needs to complete the tire lifting work in a more reasonable way, thereby improving the convenience and practicality of the operation.

[0015] 2. By setting up a telescopic mechanism, the equipment is given the ability to adjust the working coverage range, so that the lifter is no longer limited to a fixed working distance and can be extended or contracted according to actual needs. When the spare tire installation position is relatively scattered, or the vehicle structure causes the spare tire placement points to be in different positions, the telescopic mechanism can play a role. The user can adjust the length of the lifter according to the specific position of the spare tire so that it can accurately reach the spare tire. Whether it is the spare tire close to the edge of the vehicle or relatively inward, the telescopic mechanism can make the lifter easily reach it. In this way, the lifter can adapt to the spare tire lifting needs in different positions, improving the versatility and flexibility of the equipment, and making the spare tire lifting work more convenient and efficient.

[0016] 3. By setting up a locking unit, a stable hovering function is provided for the suspended tire. When the tire is lifted to the required height, the user can operate the locking unit to temporarily fix the tire in the air and keep it stationary. This hovering function facilitates subsequent operations, such as adjusting the tire position and conducting pre-installation inspections. In the absence of a locking unit, manpower is required to continuously hold the suspended tire, which not only consumes physical strength, but may also cause the tire position to be unstable due to hand tremors or fatigue, increasing the difficulty of operation and safety hazards. The application of the locking unit eliminates the need for continuous manpower holding, allowing users to focus more on other work links, improving the continuity and safety of operations, and making the entire tire lifting and installation process smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 An exploded view of the traction mechanism of the present invention; Figure 3 Schematic diagram of the internal structure of the crossbar of the present invention; Figure 4 This is a schematic diagram of the crossbar and telescopic rod structure of the present invention; Figure 5 This is a schematic diagram of the internal structure of the telescopic rod of the present invention; Figure 6 This is a schematic diagram of the winding of the traction rope of the present invention; Figure 7 It is a schematic structural diagram of the movable pulley and the shifting pulley of the present invention; Figure 8 This is a schematic diagram of the connection between the connecting tube and the stud of the present invention; Figure 9 This is a schematic diagram of the connection between the cross bar and the telescopic rod of the present invention; Figure 10 This is a schematic diagram of the connection between the handle and the ratchet assembly of the present invention; Figure 11 Schematic diagram of the ratchet assembly structure of the present invention; Figure 12 Schematic diagram of the internal structure of the sleeve of the present invention; Figure 13 This is a schematic diagram of the connection between the driving wheel and the sleeve of the present invention; Figure 14 This is a schematic diagram of the connection between the orifice plate and the sleeve of the present invention; Figure 15 It is a schematic diagram of the connection between the driven wheel and the rotating drum of the present invention.

[0018] In the picture: 1. Carriage; 2. Vertical rod; 3. Traction mechanism; 4. Telescopic mechanism; 31. Cross bar; 32. Telescopic rod; 33. Fixed guide rail; 34. Movable guide rail; 35. Bracket; 36. Fixed pulley; 37. Winding wheel; 38. Movable pulley; 39. Shifting pulley; 310. Cross shaft; 311. Connecting sleeve; 312. Stud; 313. Limiting plate; 314. Limiting hole; 315. Traction rope; 316. Hook; 317. Lifting rope; 318. Handle; 319. Ratchet assembly; 320. Toggle lever; 41. Sleeve; 42. Rotating drum; 43. Screw; 44. Driven wheel; 45. Driving wheel; 46. Telescopic shaft; 47. Handwheel; 48. Orifice plate. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] Example 1, with reference to Figures 1-9, which is the first embodiment of the present invention, provides a labor-saving auxiliary lifter for installing a spare tire on a low-bed trailer, comprising a car body 1, a vertical rod 2 rotatably connected to the outside of the car body 1, a traction mechanism 3 installed on the top of the vertical rod 2, and a telescopic mechanism 4 installed at the bottom of the vertical rod 2 for adjusting the coverage range of the lifter; the traction mechanism 3 includes a cross bar 31 fixedly connected to the top of the vertical rod 2, the cross bar 31 is connected to the vertical rod 2 to form a stable support, a telescopic rod 32 slidably connected to the inside of the cross bar 31, the telescopic rod 32 can move along the inner wall of the cross bar 31, and is symmetrically fixed to the top of the cross bar 31. The fixed guide rail 33 on the bottom inner wall of the cross bar 31 is symmetrically fixedly connected to the movable guide rail 34 on the bottom inner wall of the telescopic rod 32. The movable guide rail 34 and the fixed guide rail 33 extend in the same direction. The bracket 35 is fixedly connected to the cross bar 31 near the end of the vertical rod 2. The bracket 35 provides a support point for the rotating component at the top. The fixed pulley 36 rotatably connected to the bracket 35 on the side close to the carriage 1 can only rotate in place. The winding wheel 37 is fixedly connected to the side of the bracket 35 away from the fixed pulley 36. After the winding wheel 37 is rotated, it can be wound or unwound. The movable pulley 38 on the outside of the movable guide rail 34 is slidably connected to the displacement pulley 39 on the top of the movable guide rail 34 on the side away from the car 1, fixedly connected to the transverse shaft 310 on the side of the movable pulley 38 away from the car 1, and rotatably connected to the connecting sleeve 311 on the outside of the transverse shaft 310. The moving direction of the connecting sleeve 311 is constrained by the connecting sleeve 311. The stud 312 is fixedly connected to the side of the displacement pulley 39 close to the connecting sleeve 311. The stud 312 is threadedly connected to the connecting sleeve 311. The limit plate 313 is rotatably connected to the side of the follower pulley 38 away from the connecting sleeve 311, which is opened on the telescopic rod 3 2 , a limiting hole 314 is provided near the side of the shifting pulley 39. The limiting plate 313 cooperates with the limiting hole 314 to constrain the shifting pulley 39. A traction rope 315 is sleeved on the outside of the movable pulley 38. The traction rope 315 is used to transmit the force. The two ends of the traction rope 315 are respectively fixedly connected to the bracket 35 and the winding wheel 37. They are respectively connected to the movable pulley 38 and the hook 316 on the side of the connecting sleeve 311 away from the vertical rod 2. A lifting rope 317 is connected to the hook 316 on the outside of the connecting sleeve 311. The spare tire is lifted by the lifting rope 317. A locking unit is also assembled on the top of the crossbar 31.

[0021] Specifically, the cross bar 31 provides a support point for the entire traction mechanism 3, and the telescopic rod 32 can expand the working range of the equipment after being extended. The fixed guide rail 33 and the movable guide rail 34 guide the moving trajectory of the movable pulley 38 and the variable pulley 39. When the telescopic rod 32 is extended, the fixed guide rail 33 and the movable guide rail 34 alternately constrain the corresponding movable pulley 38 and the variable pulley 39. The bracket 35 limits the position of the fixed pulley 36 and the winding wheel 37. The fixed pulley 36 and the winding wheel 37 can only rotate in the original position. The rotation of the winding wheel 37 can reel in and out the traction rope 315. The movable pulley 38 can be connected to the lifting rope 317 through the corresponding hook 316, so that the tire can be lifted, and the tire can be lifted through the traction rope 315 through the movable pulley 38. It can play a labor-saving role. The fixed pulley 36 can be connected to the stud 312 through the horizontal axis 310 and the connecting tube, so that the force is transmitted to the variable pulley 39. When the two sides of the limiting plate 313 are parallel to the ground, the restriction on the follower pulley 38 can be released, so that it can move along the direction of the limiting hole 314. When the movable pulley 38 and the follower pulley 38 move together, the equipment will be in a more labor-saving state. The movable pulley 38 and the connecting tube transmit the force to the hanging rope 317 through the corresponding hook 316. When the connecting tube and the stud 312 are in a connected state, the hanging rope 317 is connected to the hook 316 corresponding to the connecting tube, and vice versa, it is connected to the hook 316 corresponding to the movable pulley 38, avoiding power loss due to excessive offset of the force angle.

[0022] Reference Figure 5-Figure 9 A rotary wheel is provided in a straight line at one end of the telescopic rod 32 away from the vertical rod 2, the movable pulley 38 is fixedly connected to the corresponding hook 316, the connecting sleeve 311 is rotatably connected to the corresponding hook 316, and a screw hole is opened at one end of the connecting sleeve 311 close to the stud 312, and the stud 312 is threadedly connected to the screw hole.

[0023] Specifically, the rotating wheel is used to reduce the wear of the suspension rope 317 when it is pulled and displaced. After the connecting sleeve 311 is connected to the stud 312, the force of the movable pulley 38 will be transmitted to the displacement pulley 39.

[0024] Reference Figure 6 The traction rope 315 passes through the movable pulley 38 and the fixed pulley 36 in sequence, and finally passes through the shifting pulley 39 and is fixedly connected to the winding wheel 37.

[0025] Specifically, after the winding wheel 37 reels the traction rope 315, the traction rope 315 forms multiple shorter force lines through the movable pulley 38 and the fixed pulley 36, thereby achieving the effect of dispersing the weight of the spare tire.

[0026] Reference Figure 3-Figure 11The locking unit includes a handle 318 fixedly connected to the top of the winding wheel 37, a ratchet group 319 fixedly connected to the bottom of the handle 318, and a toggle rod 320 fixedly connected to the top of the ratchet group 319.

[0027] Specifically, the ratchet assembly 319 can fix the handle 318 so that it cannot rotate. Since the handle 318 is connected to the winding wheel, the winding wheel will also be fixed after the handle 318 is fixed. The ratchet assembly 319 can be controlled by moving the toggle rod 320.

[0028] Reference Figure 3-Figure 11 The ratchet assembly 319 is composed of a pawl, a ratchet and a spring. The pawl is meshed with the ratchet, the bottom of the toggle rod 320 is fixedly connected to the pawl, the end of the spring close to the ratchet is fixedly connected to the pawl, and a short shaft is provided at the end of the spring away from the ratchet, and the top of the short shaft is fixedly connected to the cross bar 31.

[0029] Specifically, the handle 318 can drive the ratchet to rotate, and when the ratchet and the pawl are in a mating state, the handle 318 and the winding wheel 37 will be fixed.

[0030] Example 2, reference Figures 1-15 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the telescopic mechanism 4 includes a sleeve 41 rotatably connected to the bottom of the vertical rod 2, a rotating cylinder 42 rotatably connected to the inner wall of the sleeve 41, a screw rod 43 threadedly connected to the top of the rotating cylinder 42, the top of the screw rod 43 is rotatably connected to the telescopic rod 32, a driven wheel 44 fixedly connected to the bottom of the rotating cylinder 42, a driving wheel 45 rotatably connected to the bottom of the sleeve 41, a telescopic shaft 46 slidably connected to the inner side of the driving wheel 45, a handwheel 47 fixedly connected to the side of the telescopic shaft 46 away from the rotating cylinder 42, and a perforated plate 48 fixedly connected to the inner wall of the bottom of the sleeve 41.

[0031] Specifically, the sleeve 41 can rotate around the connection with the vertical rod 2, and the rotating drum 42 can rotate inside the sleeve 41. The rotating drum 42 drives the screw rod 43 to extend and retract while rotating. When the screw rod 43 extends, it will push the telescopic rod 32 to extend from the cross bar 31. When the screw rod 43 contracts, it drives the telescopic rod 32 to retract toward the inside of the cross bar 31. The telescopic shaft 46 can be rotated by turning the hand wheel 47. The telescopic shaft 46 drives the driving wheel 45 to rotate. The driving wheel 45 drives the driven wheel 44 to rotate the rotating drum 42. The telescopic shaft 46 can be moved along its own axis by pushing and pulling the hand wheel 47. When the telescopic shaft 46 is inserted into the orifice plate 48, the telescopic shaft 46 will lose its freedom of rotation.

[0032] Reference Figure 14 The telescopic shaft 46 is in the shape of a hexagonal prism, and a hexagonal hole is provided on the top of the orifice plate 48. The telescopic shaft 46 can be slidably connected with the hexagonal hole after moving.

[0033] Specifically, one end of the telescopic shaft 46 away from the hand wheel 47 can be inserted into the middle of the hexagonal hole, thereby limiting the rotation of the horizontal shaft 310 .

[0034] Reference Figure 14 The driving wheel 45 is provided with a reducing hole along the axis, the reducing hole is slidably connected to the telescopic shaft 46, and a baffle is provided in the middle of the telescopic shaft 46, which abuts against the reducing hole.

[0035] Specifically, the telescopic shaft 46 can move along the variable diameter hole, the baffle limits the maximum stroke of the telescopic shaft 46, and the remaining structure is the same as that of embodiment 1.

[0036] The traction rope 315 is wound around the bottom end of the lifting rope 317 and the spare tire, and the traction rope 315 is wound around the bottom end of the lifting rope 317 and the spare tire. The traction rope 315 exerts a force on the movable pulley 38, and the movable pulley 38 moves while pulling the lifting rope 317 through the corresponding hook 316 to lift the spare tire. The movable pulley 38, the fixed pulley 36 and the traction rope 315 form a pulley group, so that the spare tire can be lifted by a force less than the weight of the spare tire. If a heavier spare tire needs to be lifted in a more labor-saving way, the movable pulley 38 and the variable pulley 39 are connected through the connecting sleeve 311 and the stud 312, the limiting plate 313 is rotated to a state parallel to the limiting hole 314, and the top end of the lifting rope 317 is connected to the hook 316 of the corresponding connecting sleeve 311. When the variable pulley 39 is movable, it is equivalent to adding a movable pulley 3 8, and since the labor-saving effect of the pulley group depends on the number of rope strands that bear the weight, the number of movable pulleys determines the number of rope strands that bear the weight. At this time, rotating the winding wheel 37 will lift the spare tire more labor-saving. After lifting the spare tire, the ratchet and the pawl are matched by toggling the rod 320, so that the winding wheel 37 cannot rotate, thereby achieving the suspension of the spare tire. When the spare tire needs to be lifted to a farther position, the handwheel 47 is turned to rotate the telescopic shaft 46. The telescopic shaft 46 rotates the rotating drum 42 through the driving wheel 45 and the driven wheel 44. The rotating drum 42 drives the screw rod 43 to extend, and the screw rod 43 drives the telescopic rod 32 to extend from the horizontal rod 31, thereby increasing the coverage range of the telescopic rod 32. By pushing the handwheel 47 toward the direction of the vertical rod 2, the telescopic shaft 46 can be inserted into the hole plate 48, so that the handwheel 47 cannot rotate, thereby avoiding accidental touch and unnecessary movement of the telescopic rod 32.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A labor-saving auxiliary lifter for installing a spare tire on a low-bed trailer, comprising a carriage and a vertical rod arranged outside the carriage, characterized in that: It also includes a traction mechanism provided at the top of the vertical rod, and a telescopic mechanism provided at the bottom of the vertical rod for adjusting the coverage of the lifter; The traction mechanism includes a cross bar arranged at the top of the vertical bar, the cross bar and the vertical bar are connected to form a stable support, a telescopic rod arranged on the inside of the cross bar, the telescopic rod can move along the inner wall of the cross bar, a fixed guide rail symmetrically arranged on the inner wall of the bottom of the cross bar, a movable guide rail symmetrically arranged on the inner wall of the bottom of the telescopic rod, the movable guide rail and the fixed guide rail extending in the same direction, a bracket arranged on the cross bar near one end of the vertical bar, the bracket provides a support point for the rotating component at the top, a fixed pulley arranged on the side of the bracket near the car, the fixed pulley can only rotate in its original position, a winding wheel arranged on the side of the bracket away from the fixed pulley, the winding wheel can reel in or unreel after rotation, a movable pulley on the outside of the movable guide rail near the car side, and a variable pulley arranged on the top of the movable guide rail away from the car side. , a horizontal axis is arranged on the side of the movable pulley away from the car body, a connecting sleeve is arranged on the outside of the horizontal axis, the moving direction of the connecting sleeve is constrained by the connecting sleeve, a stud is arranged on the side of the variable pulley close to the connecting sleeve, the stud is threadedly connected to the connecting sleeve, a limiting plate is arranged on the side of the follower pulley away from the connecting sleeve, a limiting hole is opened on the side of the telescopic rod close to the variable pulley, the limiting plate and the limiting hole can constrain the variable pulley, a traction rope is arranged on the outside of the movable pulley, the traction rope is used to transmit the force, the two ends of the traction rope are respectively fixedly connected to the bracket and the winding wheel, respectively, hooks are respectively arranged on the side of the movable pulley and the connecting sleeve away from the vertical rod, a hanging rope is arranged on the hook outside the connecting sleeve, the spare tire is lifted by the hanging rope, and a locking unit is arranged at the top of the cross bar.

2. The labor-saving auxiliary lifter for installing a spare tire on a low-bed trailer according to claim 1 is characterized in that: A rotating wheel is provided in a straight line at one end of the telescopic rod away from the vertical rod, the movable pulley is fixedly connected to the corresponding hook, the connecting sleeve is rotatably connected to the corresponding hook, and a screw hole is provided at one end of the connecting sleeve close to the stud, and the stud is threadedly connected to the screw hole.

3. The labor-saving auxiliary lifter for installing a spare tire on a low-bed trailer according to claim 1 is characterized in that: The traction rope passes around the movable pulley and the fixed pulley in sequence, and finally passes around the shifting pulley and is fixedly connected to the winding wheel.

4. The labor-saving auxiliary lifter for installing a spare tire on a low-bed trailer according to claim 1, characterized in that: The locking unit includes a handle arranged on the top of the winding wheel, a ratchet group arranged on the bottom of the handle, and a toggle rod arranged on the top of the ratchet group.

5. The labor-saving auxiliary lifter for installing a spare tire on a low-bed trailer according to claim 4 is characterized in that: The ratchet assembly is composed of a pawl, a ratchet and a spring. The pawl is meshed with the ratchet, the bottom of the toggle rod is fixedly connected to the pawl, the end of the spring close to the ratchet is fixedly connected to the pawl, and the end of the spring away from the ratchet is provided with a short shaft, and the top of the short shaft is fixedly connected to the cross bar.

6. The labor-saving auxiliary lifter for installing a spare tire on a low-bed trailer according to claim 1, characterized in that: The telescopic mechanism includes a sleeve arranged at the bottom of the vertical rod, a rotating cylinder arranged on the inner wall of the sleeve, a screw arranged at the top of the rotating cylinder, the top of the screw rod is rotatably connected to the telescopic rod, a driven wheel arranged at the bottom of the rotating cylinder, a driving wheel arranged at the bottom of the sleeve, a telescopic shaft arranged on the inner side of the driving wheel, a handwheel arranged on the side of the telescopic shaft away from the rotating cylinder, and a perforated plate arranged on the inner wall of the bottom of the sleeve.

7. The labor-saving auxiliary lifter for installing a spare tire on a low-bed trailer according to claim 6, characterized in that: The telescopic shaft is in the shape of a hexagonal prism, and a hexagonal hole is provided on the top of the orifice plate. The telescopic shaft can be slidably connected with the hexagonal hole after moving.

8. The labor-saving auxiliary lifter for installing a spare tire on a low-bed trailer according to claim 6, characterized in that: The driving wheel is provided with a diameter-changing hole along the axis, the diameter-changing hole is slidably connected with the telescopic shaft, a baffle is provided in the middle of the telescopic shaft, and the baffle abuts against the diameter-changing hole.

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