Adjustable eccentric wheel and automobile lifting appliance for assembly line

Abstract

The embodiment of the invention provides an adjustable eccentric wheel and an automobile sling for an assembly line, the adjustable eccentric wheel comprises a wheel body, a wheel shaft and a positioning ring, the wheel shaft comprises a concentric shaft and an eccentric positioning shaft, the concentric shaft is coaxially sleeved on the inner side of the wheel body, the eccentric positioning shaft is fixedly connected with the concentric shaft, and the axis of the eccentric positioning shaft and the axis of the concentric shaft are arranged in parallel according to a preset distance; the outer side surface of the eccentric positioning shaft is a regular polygon; a positioning hole used for containing the eccentric positioning shaft is formed in the positioning ring, and the inner side face of the positioning hole is a regular polygon matched with the outer side face of the eccentric positioning shaft. By the adoption of the technical scheme, rigid limiting can be formed through the polygonal matching mode between the eccentric positioning shaft and the positioning ring, the problem that the eccentric shaft is difficult to position and consequently frequent rotation is caused is solved, and therefore normal operation of a production line is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile production, and particularly relates to an adjustable eccentric wheel and an automobile sling for an assembly line. Background Art

[0002] Automobile slings are used on automobile assembly lines to support or lift body parts, so as to realize operations such as conveying and transferring of body parts. In order to facilitate adjustment, components such as balance wheels and opening wheels on automobile slings are often designed as eccentric wheels. In the prior art, frequent maintenance is required, otherwise, after a period of time, the operating state of the automobile sling will become unstable (including the imbalance of the automobile sling, abnormal opening and closing of the opening parts such as the boom, etc.), resulting in problems such as transfer offset and body interference in the automobile production process, leading to production interruption. Therefore, how to avoid the unstable operating state of the automobile sling and thus ensure the continuous operation of production is a problem to be solved. Summary of the Invention

[0003] An embodiment of the present invention provides an adjustable eccentric wheel and an automobile sling for an assembly line, which are used to avoid the unstable operating state of the automobile sling and thus ensure the continuous and stable operation of production.

[0004] To achieve the above object, on the one hand, an embodiment of the present invention provides an adjustable eccentric wheel, including: a wheel body, a wheel shaft and a positioning ring. The wheel shaft includes a concentric shaft coaxially sleeved inside the wheel body and an eccentric positioning shaft fixedly connected to the concentric shaft. The axis of the eccentric positioning shaft is parallel to the axis of the concentric shaft at a preset distance; the outer side surface of the eccentric positioning shaft is a regular polygon; a positioning hole for accommodating the eccentric positioning shaft is formed inside the positioning ring, and the inner side surface of the positioning hole is a regular polygon matching the outer side surface of the eccentric positioning shaft.

[0005] Further, the adjustable eccentric wheel further includes a shaft seat, and a through hole is formed in the shaft seat; the wheel shaft further includes an eccentric circular shaft fixedly connected to the eccentric positioning shaft, and the outer diameter of the eccentric circular shaft matches the inner diameter of the through hole.

[0006] Further, the positioning ring can rotate along its own axis.

[0007] Further, the side surface of the positioning ring is attached to the side surface of the shaft seat. An adjusting arm extending outwards on both sides is connected to the outer edge of the positioning ring. Two ball head set screws are screwed on the shaft seat, and the positions of the two ball head set screws correspond to the positions of the two adjusting arms respectively; the surface of the adjusting arm facing the ball head set screw is a flat surface.

[0008] Further, the number of sides of the outer side surface of the eccentric positioning shaft is n, and the rotation angle range α of the positioning ring is α = 360° / n.

[0009] Further, the outer side surface of the eccentric positioning shaft is a regular dodecagon, and the inner side surface of the positioning hole is a regular dodecagon.

[0010] Furthermore, a setscrew nut is also provided between the shaft seat and the spherical setscrew.

[0011] Furthermore, the adjustable eccentric wheel further includes a lock nut; at the end of the eccentric circular shaft away from the concentric shaft, a threaded end is further provided, and the lock nut is screwed onto the threaded end.

[0012] On the other hand, an embodiment of the present invention further provides a vehicle hoist for an assembly line, including a hoist top frame, hoist arms hinged below both sides of the hoist top frame, balance wheels, opening wheels, a load-bearing beam assembly for connecting an assembly line driving device, and a balance track and a hoist arm opening plate laid along the running direction of the assembly line; the load-bearing beam assembly is hinged to the top end of the hoist top frame, the balance wheels are connected to both sides of the hoist top frame, the opening wheels are connected to the outer sides of the hoist arms, the outer edges of the wheels of the balance wheels abut against the lower part of the balance track, and the outer edges of the wheels of the opening wheels are pressed against the hoist arm opening plate; both the balance wheels and the opening wheels adopt the adjustable eccentric wheels as described above.

[0013] The above technical solution has the following beneficial effects:

[0014] This technical solution improves the structure of the adjustable eccentric wheel in the vehicle hoist. Through the cooperation of the polygonal eccentric positioning shaft and the polygonal positioning ring, rigid limiting can be generated for the eccentric shaft during use, avoiding the problem of the eccentric shaft rotating due to insufficient friction in the prior art. And by changing the mating surface between the eccentric positioning shaft and the positioning ring, the adjustable eccentric wheel can be adjusted, ensuring that the adjustable eccentric wheel will not change its eccentric state due to loosening during operation, and further ensuring that the improved vehicle hoist will not frequently experience unbalance, abnormal opening and closing of the hoist arm, etc. like the prior art, ensuring the continuous and stable operation of production.

[0015] In addition, this technical solution also has the following characteristics:

[0016] 1) In the prior art, due to the frequent rotation of the eccentric shaft under force, the hoist has abnormalities such as unbalance and abnormal opening and closing of the hoist arm. If production interruption is to be avoided, a large number of maintenance personnel need to be arranged for frequent regular inspections to readjust and fix the position. Usually, there are hundreds of hoists on the production line, and the probability of problems with the balance wheels or opening wheels is very high under high production capacity, which leads to a huge workload for the maintenance personnel; after adopting this technical solution, since the eccentric wheel relies on rigid positioning and no longer relies on frictional fastening, the eccentric positioning of the adjustable eccentric wheel is very reliable, and there is no need to do so much inspection and maintenance work, greatly reducing the labor cost and workload.

[0017] 2) In the prior art, when abnormal conditions such as imbalance of the vehicle hoist or opening and closing of the boom occur, if timely maintenance cannot be carried out, it is very likely that the assembly precision error of the vehicle exceeds the tolerance, affecting the quality of the final product. After adopting this technical solution, the occurrence of this problem can be effectively avoided, thus ensuring the product quality.

[0018] 3) In the improved adjustable eccentric wheel of the present application, through the ball head set screw arranged on the shaft seat, the positioning ring can be pushed to adjust within a certain angle range, thereby driving the entire adjustable eccentric wheel to rotate synchronously. Through dimension design, when the angle adjustment range of the positioning ring is exactly equal to the supplementary angle of the inner angle of the positioning hole, the overall adjustable eccentric wheel can achieve any angle adjustment within the range of 360°, providing convenience for on-site adjustment work. Two adjustment arms are arranged on the outer edge of the positioning ring. When adjusting the rotation angle of the positioning ring by pressing the adjustment arm with the ball head set screw, the adjustment arm provides a force arm, making the operation more labor-saving and with higher adjustment precision, and angle fine-tuning can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is a structural schematic diagram of an adjustable eccentric wheel according to an embodiment of the present invention;

[0021] Figure 2 is a first schematic diagram of angle fine-tuning of an adjustable eccentric wheel through a positioning ring according to an embodiment of the present invention;

[0022] Figure 3 is a second schematic diagram of angle fine-tuning of an adjustable eccentric wheel through a positioning ring according to an embodiment of the present invention;

[0023] Figure 4 is a structural schematic diagram of a vehicle hoist for an assembly line according to an embodiment of the present invention;

[0024] Reference numerals in the drawings: 1, lock nut; 2, shaft seat; 3, ball head set screw; 4, set screw nut; 5, positioning ring; 6, eccentric circular shaft; 7, eccentric positioning shaft; 8, concentric shaft; 9, wheel body; 10, threaded end; 11, positioning hole; 12, adjustment arm; 13, through hole; 100, hoist top frame; 200, boom; 300, load-bearing beam assembly; 400, balance track; 500, balance wheel; 600, boom opening plate; 700, opening wheel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] As Figure 1 shown, an adjustable eccentric wheel is provided in an embodiment of the present invention, which includes a wheel body 9, a wheel shaft, and a positioning ring 5. The wheel shaft includes a concentric shaft 8 coaxially sleeved inside the wheel body 9 and an eccentric positioning shaft 7 fixedly connected to the concentric shaft 8. The axis of the eccentric positioning shaft is parallel to the axis of the concentric shaft 8 at a preset distance. The outer side surface of the eccentric positioning shaft 7 is a regular polygon. A positioning hole 11 for accommodating the eccentric positioning shaft 7 is formed inside the positioning ring 5, and the inner side surface of the positioning hole 11 is a regular polygon matching the outer side surface of the eccentric positioning shaft 7.

[0027] On another type of crane used as a comparative example, a balance wheel 500 and / or an opening wheel 700 are provided. (Refer to Figure 4 shown) The outer edge of the wheel of the balance wheel 500 abuts against the balance track 400, and its function is to maintain the balance of the crane. The opening wheel 700 is used to open and close the boom 200 to separate the conveyed vehicle body parts from the crane. When the balance wheel 500 and / or the opening wheel 700 malfunction during operation, it will cause the vehicle carrier to be unbalanced, the boom 200 to open and close abnormally, etc. The same conclusion holds for other vehicle carriers such as trolleys.

[0028] Upon further analysis by the inventor, it is known that the direct cause of the failure of the balance wheel 500 and / or the opening wheel 700 during operation lies in the structure of the adjustable eccentric wheel they adopt. The eccentric shaft of this adjustable eccentric wheel can rotate and adjust within the installation hole of the fixed shaft seat, causing the height of the outer edge of the wheel to change accordingly to meet the usage requirements. However, its structure follows the existing conventional adjustable eccentric wheel technology. The eccentric shaft is fixed within the installation hole by directly pressing the outer shaft surface of the eccentric shaft with a radially arranged setscrew, that is, the friction force between the end face of the setscrew and the shaft surface of the eccentric shaft is used to prevent the eccentric shaft from rotating. In the actual application process, there is generally a problem of insufficient friction force in this eccentric shaft positioning method. Moreover, since the lever arm during the tightening of the setscrew is also very small (the lever arm is equal to the radius of the eccentric shaft), and the wheel diameter of the balance wheel 500 or the opening wheel 700 is much larger than the shaft diameter of the eccentric shaft, once the torque transmitted to the eccentric shaft by the assembly line through the balance wheel 500 or the opening wheel 700 is greater than the stopping torque provided by the friction force, the original installation position is difficult to maintain, and the eccentric shaft is very likely to rotate. As a result, the wheel body of the balance wheel 500 or the opening wheel 700 loses its originally adjusted position. The structural defect of the existing adjustable eccentric wheel is the cause of the eccentric wheel failure, and the difficulty of the eccentric shaft in maintaining its position is the form of the eccentric wheel failure, which in turn leads to abnormal situations in the vehicle carrier.

[0029] Therefore, if the eccentric shaft of the adjustable eccentric wheel can be firmly held in a predetermined position, problems such as imbalance of the vehicle carrier caused by the change in the position of the eccentric wheel can be avoided.

[0030] For this reason, in this technical solution, a brand-new adjustable eccentric wheel is designed, and the fixing method of the eccentric shaft in the adjustable eccentric wheel is redesigned. Instead of using a set screw to directly tighten the eccentric shaft, a section with a regular polygon (such as a square, hexagon, octagon, dodecagon, etc.) on its outer side is separately added in the axial direction of the eccentric shaft for fastening and positioning. Therefore, this section can be called the eccentric positioning shaft 7. At the same time, a positioning ring 5 is set to achieve the shaft-hole fit with the eccentric positioning shaft 7. The shape of the positioning hole 11 opened on the positioning ring 5 is the same as the shape of the regular polygon on the outer side of the eccentric positioning shaft 7, while the size is slightly smaller than the size of the outer side of the eccentric positioning shaft 7, so that the eccentric positioning shaft 7 can easily penetrate into the positioning hole 11. In application, according to the need, the eccentric positioning shaft 7 is rotated to the appropriate position, so that the adjustable eccentric wheel is adjusted to the corresponding orientation. Then, the eccentric positioning shaft 7 is inserted into the positioning hole 11, and the connection between the positioning ring 5 and the eccentric positioning shaft 7 is achieved. In this design, since the fit between the positioning ring 5 and the eccentric positioning shaft 7 is no longer a circular shaft-hole fit, but a polygon-to-polygon fit, a rigid connection is formed between the two, and no additional friction is required to maintain it. Therefore, as long as the positioning ring 5 is fixed, the relative rotation between the two will not be caused by external forces, and the connection reliability is very high, so that the position of the entire adjustable eccentric wheel is fixed and will no longer be prone to the position change of the eccentric shaft as in the prior art.

[0031] Furthermore, in actual application, if the positioning ring 5 is fixed and used as the support part of the entire adjustable eccentric wheel, the adjustable eccentric wheel can only be adjusted step by step instead of arbitrarily, because for the eccentric positioning shaft 7 with a polygon (assuming the number of its sides is n), every time it rotates past a side, the angle of the entire wheel shaft rotates by 360° / n. Therefore, in this application, the conventional shaft seat 2 is still retained, and a coaxial eccentric circular shaft 6 is connected to the eccentric positioning shaft 7. The eccentric circular shaft 6 and the shaft seat 2 are in shaft-hole fit, so that the overall adjustable eccentric wheel still takes the shaft seat 2 as the installation and fixing basis.

[0032] Furthermore, since the eccentric circular shaft 6 can rotate along the through hole 13 of the shaft seat 2, while the connection between the positioning ring 5 and the eccentric positioning shaft 7 is an interference fit and cannot rotate relative to each other. Therefore, in order to enable the adjustable eccentric wheel to adjust the angle, the positioning ring 5 and the shaft seat 2 cannot be fixedly connected together, but the positioning ring 5 is allowed to rotate circumferentially along its own axis.

[0033] Furthermore, the preferred implementation mode is, as Figure 1As shown, the outer side surface of the positioning ring 5 is attached to the inner side surface of the shaft seat 2. Two adjusting arms 12 extending outward to both sides are provided at the outer edge of the positioning ring 5. A stepped surface is provided at the top of the shaft seat 2, such that the stepped surface is located above the positioning ring 5, and two ball head set screws 3 are connected through screw holes opened on the stepped surface. The bottoms of the two ball head set screws 3 are respectively located above the two adjusting arms 12. The design of the double ball head set screws 3 can resist the adjusting arms 12 from both ends to prevent the positioning ring 5 from rotating by itself (since the positioning ring 5 is suspended and not fixedly connected to the shaft seat 2). At the same time, this design enables the angle of the adjustable eccentric wheel to be adjustable: when adjusting the ball head set screw 3, the positioning ring 5 rotates by extrusion, thereby driving the entire wheel shaft to rotate, so that the orientation of the adjustable eccentric wheel can be adjusted. For example, as Figure 2 shown, when the ball head set screw 3 on the left side in the figure is adjusted downward and the ball head set screw 3 on the right side is adjusted upward, the positioning ring 5 rotates counterclockwise by a certain angle, thereby driving the wheel body 9 to rotate synchronously counterclockwise through the concentric shaft 8; as Figure 3 shown, when the ball head set screw 3 on the left side in the figure is adjusted upward and the ball head set screw 3 on the right side is adjusted downward, the positioning ring 5 rotates clockwise by a certain angle, thereby driving the wheel body 9 to rotate synchronously clockwise through the concentric shaft 8.

[0034] That is to say, in the present application, the "coarse adjustment" of the wheel shaft angle can be achieved through the regular polygon structure of the eccentric positioning shaft 7 and the positioning hole 11. After that, by adjusting the angle of the positioning ring 5 through the ball head set screw 3, the "fine adjustment" of the wheel shaft angle can be achieved to meet various requirements of practical applications.

[0035] Furthermore, in order to maximize the satisfaction of the use requirements, the wheel shaft should be adjusted at any angle of 360°. At this time, if the number of sides of the outer side surface of the eccentric positioning shaft 7 is n, the rotation angle range α of the positioning ring 5 should be α = 360° / n, that is, when the eccentric positioning shaft 7 rotates through one side surface, the rotated angle is α. When in use, after adjusting the adjustable eccentric wheel to an angle close to the required angle by setting the installation angle of the eccentric positioning shaft 7, the angle can be finely adjusted to the precise position by further adjusting the positioning ring 5 through the ball head set screw 3. In order to achieve this rotation angle range of the positioning ring 5, it can be achieved by comprehensively designing the length dimension of the ball head set screw 3, the size of the positioning ring 5 itself, and the size of the shaft seat 2.

[0036] Furthermore, the most preferred solution in the present application is that the outer side surface of the eccentric positioning shaft 7 is a regular dodecagon, and the inner side surface of the positioning hole 11 is a regular dodecagon. At this time, when the eccentric positioning shaft 7 rotates through one side surface, the rotated angle is 30°. Correspondingly, through optimizing the dimension design, the circumferential rotation angle range of the positioning ring 5 should be 30°. At this time, the processing convenience is high, the polygonal fit between the eccentric positioning shaft 7 and the positioning ring 5 is stable and reliable, and the 30° adjustment range of the positioning ring 5 is also easy to achieve.

[0037] Furthermore, a screw nut 4 is provided between the shaft seat 2 and the ball head screw 3 for locking the ball head screw 3 to prevent the ball head screw 3 from rotating accidentally.

[0038] Furthermore, the adjustable eccentric wheel also includes a locking nut 1, and a threaded end 10 is also provided at the end of the eccentric circular shaft 6 away from the coaxial shaft 8, and the locking nut 1 is screwed onto the threaded end 10. The locking nut 1 is used to prevent the wheel axle and the positioning ring 5 from axially loosening in the shaft seat 2.

[0039] like Figure 4 As shown, the embodiment of the present invention further provides an automobile hoist, which includes a hoist top frame 100, a suspension arm 200 hinged at both sides of the suspension top frame 100, a balancing wheel 500, an opening wheel 700, and a load-bearing beam assembly 300 for connecting an assembly line drive device, wherein the load-bearing beam assembly 300 is hinged at the top of the suspension top frame 100, the balancing wheel 500 is connected to both sides of the suspension top frame 100, and the opening wheel 700 is connected to the outer side of the suspension arm 200, wherein the balancing wheel 500 and the opening wheel 700 are both of the aforementioned adjustable type. Eccentric wheel; the outer edge of the opening wheel 700 is pressed against the boom opening plate 600. As the height position of the boom opening plate 600 changes, the height position of the opening wheel 700 changes accordingly, thereby driving the boom 200 to open and close at an accurate angle. Therefore, the function of the opening wheel 700 is to realize the opening and closing of the boom 200 and thus realize the separation of the transported body parts and the sling; the outer edge of the balancing wheel 500 is against the bottom of the balancing track 400, and its function is to maintain the balance of the automobile sling, thereby ensuring the smooth transportation, precise assembly and accurate hanging of the body parts.

[0040] When the balancing wheel 500 and the opening wheel 700 adopt the existing conventional adjustable eccentric wheels, as mentioned above, since the eccentric shaft is directly tightened by the top screw, this method generally has the problem of insufficient friction, and since the force arm when the top screw is tightened is also very small (the force arm is equal to the radius of the eccentric shaft), and the wheel diameter of the eccentric wheel is much larger than the shaft diameter of the eccentric shaft, it is often the case that the rotational torque of the eccentric shaft is greater than the stopping torque provided by the friction force, resulting in unexpected rotation of the eccentric shaft and difficulty in maintaining the original installation position. Therefore, during use, the operating state may be unstable. For example, the displacement of the eccentric shaft of the balancing wheel 500 may cause imbalance of the vehicle carrier, and the displacement of the eccentric shaft of the opening wheel 700 may cause abnormal opening and closing of the boom 200, which may lead to problems such as rotation offset and body interference. Automobile assembly is a delicate process, and these problems may lead to serious product quality problems and even production interruptions. Therefore, problems are bound to occur when the adjustable eccentric wheel of the prior art is applied to the automobile sling.

[0041] The adjustable eccentric wheel of the present application has a new structural design. There is a rigid limit between the eccentric shaft and the positioning ring, and the friction fastening method is no longer used. Therefore, the rotation of the eccentric shaft due to insufficient friction is avoided, ensuring that the eccentric state does not change due to loosening during operation. Therefore, it can be applied to equipment such as automobile lifting appliances, ensuring the reliable and stable operation of the automobile lifting appliance, without situations such as unbalanced lifting appliances and abnormal opening and closing of the boom, and ensuring product quality.

[0042] At the same time, after adopting this design, the angle adjustment of the eccentric shaft is also very convenient. For small-angle adjustment requirements, only need to loosen the locking nut 1 and the jacking nut 4 appropriately, then adjust the spherical head jacks 3 on both sides to rotate the positioning ring 5 by a corresponding angle, and then tighten the locking nut 1 and the jacking nut 4; for large-angle adjustment, only need to remove the wheel shaft, rotate it to a suitable angle, make the eccentric positioning shaft 7 and the positioning ring 5 cooperate at a suitable angle, and then reinstall it. If there is still deviation, the positioning ring 5 can be adjusted appropriately. After adjustment, the height of the outer edge of the wheel body 9 changes accordingly, which can meet the use requirements. Therefore, after the adjustable eccentric wheel is applied to the automobile lifting appliance, it can greatly facilitate the adjustment work and improve work efficiency.

[0043] The adjustable eccentric wheel of the embodiment of the present invention can also be applied to other vehicle carriers, such as trolleys, etc. The balance wheels on the trolleys can also adopt the aforementioned adjustable eccentric wheels.

[0044] In the above detailed description, various features are combined in a single embodiment to simplify the present disclosure. This method of disclosure should not be construed as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly recited in each claim. On the contrary, as reflected in the appended claims, the present invention is in a state with fewer features than all the features of the disclosed single embodiment. Therefore, the appended claims are hereby clearly incorporated into the detailed description, where each claim stands alone as a separate preferred embodiment of the present invention.

[0045] In order to enable any person skilled in the art to implement or use the present invention, the above-described disclosed embodiments have been described. For those skilled in the art; various modification methods of these embodiments are obvious, and the general principles defined herein can also be applied to other embodiments without departing from the spirit and protection scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in the present application.

[0046] The specific embodiments described above further elaborate on the object, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An adjustable eccentric wheel, characterized in that, Comprising: A wheel body (9), a wheel shaft and a positioning ring (5), wherein the wheel shaft includes a concentric shaft (8) coaxially sleeved inside the wheel body (9), and an eccentric positioning shaft (7) fixedly connected to the concentric shaft (8), and the axis of the eccentric positioning shaft is arranged in parallel with the axis of the concentric shaft (8) at a preset distance; the outer side surface of the eccentric positioning shaft (7) is a regular polygon; a positioning hole (11) for accommodating the eccentric positioning shaft (7) is formed inside the positioning ring (5), and the inner side surface of the positioning hole (11) is a regular polygon matching the outer side surface of the eccentric positioning shaft (7).

2. The adjustable eccentric wheel according to claim 1, characterized in that, The adjustable eccentric wheel further includes a shaft seat (2), and the shaft seat (2) is provided with a through hole (13); the wheel shaft further includes an eccentric circular shaft (6) fixedly connected to the eccentric positioning shaft (7), and the outer diameter of the eccentric circular shaft (6) matches the inner diameter of the through hole (13).

3. The adjustable eccentric wheel according to claim 2, wherein The positioning ring (5) can rotate along its own axis.

4. The adjustable eccentric wheel according to claim 3, characterized in that, The side surface of the positioning ring (5) is attached to the side surface of the shaft seat (2), the outer edge of the positioning ring (5) is connected with adjustment arms (12) extending outwards on both sides, two ball head set screws (3) are screwed on the shaft seat (2), and the positions of the two ball head set screws (3) respectively correspond to the positions of the two adjustment arms (12); the surface of the adjustment arm (12) facing the ball head set screw (3) is a flat surface.

5. The adjustable eccentric wheel according to claim 4, wherein The number of sides of the outer side surface of the eccentric positioning shaft (7) is n, and the rotation angle range α of the positioning ring (5) = 360° / n.

6. The adjustable eccentric wheel according to claim 5, wherein The outer side surface of the eccentric positioning shaft (7) is a regular dodecagon, and the inner side surface of the positioning hole (11) is a regular dodecagon.

7. The adjustable eccentric wheel according to claim 4, wherein A set screw nut (4) is further arranged between the shaft seat (2) and the ball head set screw (3).

8. The adjustable eccentric wheel according to claim 3, characterized in that, The adjustable eccentric wheel further includes a lock nut (1); at one end of the eccentric circular shaft (6) far from the concentric shaft (8), a threaded end (10) is further provided, and the lock nut (1) is screwed on the threaded end (10).

9. An automobile lifting device for an assembly line, characterized in that, Comprising a spreader top frame (100), suspension arms (200) hinged below both sides of the spreader top frame (100), balance wheels (500), opening wheels (700), a carrier beam assembly (300) for connecting an assembly line driving device, and a balance track (400) and a suspension arm opening plate (600) laid along the running direction of the assembly line; the carrier beam assembly (300) is hinged to the top end of the spreader top frame (100), the balance wheels (500) are connected to both sides of the spreader top frame (100), the opening wheels (700) are connected to the outer sides of the suspension arms (200), the outer edge of the wheel of the balance wheel (500) abuts against the lower part of the balance track (400), and the outer edge of the wheel of the opening wheel (700) presses against the suspension arm opening plate (600); both the balance wheels (500) and the opening wheels (700) adopt the adjustable eccentric wheel as described in any one of claims 1-8.

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