A welded shaft for a universal wheel, a wheel assembly thereof, and a universal wheel

Abstract

The present invention discloses a welding shaft for a universal wheel, a wheel assembly and a universal wheel. The welding shaft includes a large wheel welding shaft and a small wheel welding shaft. The large wheel welding shaft includes a large wheel welding shaft body, a large wheel welding shaft retaining ring and a large wheel welding shaft fixing head which are sequentially formed into an integral part; the small wheel welding shaft includes a small wheel welding shaft body, a small wheel welding shaft retaining ring and a small wheel welding shaft fixing head which are sequentially formed into an integral part. The wheel assembly for the universal wheel includes a wheel axle fixing plate, the welding shaft as described above, a large wheel and a small wheel. The universal wheel includes an outer guard plate, an outer fixing plate, a wheel axle driving connector, a plurality of wheel assemblies as described above, an inner fixing plate, an inner guard plate and a plurality of shock absorbing assemblies. The layout is more reasonable, which is conducive to the large wheel and the small wheel being evenly distributed on the same circumference, the force is evenly applied, the transition is smoother, the steering is more precise, it is less prone to slipping, the wear is small, the service life is long, and it is conducive to reducing production costs and maintenance costs.

Description

Technical Field

[0001] The invention relates to a welding shaft and a wheel assembly and a universal wheel, in particular to a welding shaft and a wheel assembly and a universal wheel for the universal wheel. Background Art

[0002] Wheelchairs are common medical devices that provide assistance to users with physical disabilities and mobility impairments. Users can exercise, rehabilitate, or participate in various social activities with the help of wheelchairs. Current wheelchairs have the disadvantages of inconvenient steering and a large rotation radius. They cannot turn freely in a narrow space, which seriously affects the user experience. For this reason, some new wheelchairs use universal wheels instead of ordinary wheels to achieve the technical effect of arbitrary steering of the wheelchair, improve the performance of the wheelchair, and enhance the user experience of the wheelchair. However, there are several disadvantages.

[0003] 1. Wheels are important accessories for mobile products. The existing welded shaft can make the large wheel and the small wheel distributed on the same circumference, but the welded shaft setting of the large wheel and the small wheel is not evenly stressed, resulting in inaccurate steering, wear and tear, and is not conducive to mass production.

[0004] Second, there is no wear warning feature on the existing universal wheels, which makes it impossible for users to make a reasonable judgment on whether to replace the rubber wheels. Some users fail to replace the worn rubber wheels in time, causing slipping and other dangers; other users, fearing slipping and other dangers, replace the rubber wheels too frequently, causing unnecessary waste.

[0005] 3. The existing universal wheels do not have a shock-absorbing structure. The axial torque, motion stress and impact force from left and right steering directly act on the various components of the existing universal wheels. The shaking of the components causes bumps, and the friction and collision between the parts produce noise, affecting the user's comfort. The torque, stress and impact force directly acting on the components are easy to cause strain on the components, greatly reducing the service life of the universal wheel.

[0006] Fourth, the welding shaft in the wheel assembly of the universal wheel in the prior art is usually a smooth cylindrical body. When the fixing plate is connected to the welding shaft, it is difficult to locate and determine the center point of the welding shaft, so the welding connection between the fixing plate and the welding shaft deviates from the center of the welding shaft, resulting in uneven force on the left and right rubber wheels; or the welding shaft slips during the welding process, resulting in loose welding and quality risks.

[0007] 5. The universal wheel in the prior art is not removable due to the large number of non-detachable connection methods such as welding. The non-detachable structure makes the assembly of the universal wheel take a long time; and it is impossible to maintain and replace individual parts, which is not conducive to maintenance and causes a series of safety hazards. At the same time, the failure of a part can cause the entire universal wheel to be unusable, so the entire universal wheel needs to be replaced, which is costly and wasteful. Summary of the invention

[0008] The first technical problem to be solved by the present invention is to provide a welded shaft for a universal wheel, which has a more reasonable layout, is conducive to the large wheel and the small wheel being evenly distributed on the same circumference, has uniform force, smoother transition, more precise steering, is less prone to slipping, has less wear, and has a long service life, which is conducive to reducing production costs and maintenance costs.

[0009] In order to solve the first technical problem mentioned above, the welding shaft for the universal wheel of the present invention includes a large wheel welding shaft and a small wheel welding shaft, the large wheel welding shaft includes a large wheel welding shaft body, a large wheel welding shaft retaining ring, and a large wheel welding shaft fixing head which are sequentially formed into an integral part; the small wheel welding shaft includes a small wheel welding shaft body, a small wheel welding shaft retaining ring, and a small wheel welding shaft fixing head which are sequentially formed into an integral part.

[0010] Optionally, the large wheel welding shaft body, the large wheel welding shaft retaining ring, and the large wheel welding shaft fixing head are located on the same axis;

[0011] The small wheel welding shaft body, the small wheel welding shaft retaining ring, and the small wheel welding shaft fixing head are located on the same axis;

[0012] The length of the large wheel welding shaft body is greater than the length of the small wheel welding shaft body.

[0013] Optionally, the large wheel welding shaft retaining ring is in the shape of a perfect circular segment;

[0014] The shape of the small wheel welding shaft retaining ring is an excellent circular shape.

[0015] Compared with the prior art, the welded shaft for the universal wheel of the present invention has the following beneficial effects.

[0016] The technical solution adopts the technical means that the welding shaft includes a large wheel welding shaft and a small wheel welding shaft, the large wheel welding shaft includes a large wheel welding shaft body, a large wheel welding shaft retaining ring, and a large wheel welding shaft fixing head which are sequentially formed into an integral part; the small wheel welding shaft includes a small wheel welding shaft body, a small wheel welding shaft retaining ring, and a small wheel welding shaft fixing head which are sequentially formed into an integral part. Different wheels correspond to different shaft body settings. Therefore, the layout is more reasonable, which is conducive to the large wheel and the small wheel being evenly distributed on the same circumference, uniform force, smoother transition, more precise steering, less slipping, less wear, and a long service life, which is conducive to reducing production costs and maintenance costs.

[0017] The present invention also provides a wheel assembly thereof, wherein the welding shaft layout of the wheel assembly is more reasonable, which is conducive to the large wheel and the small wheel being evenly distributed on the same circumference, the force is evenly distributed, the transition is smoother, the steering is more precise, it is less likely to slip, the wear is small, the service life is long, and it is conducive to reducing production costs and maintenance costs.

[0018] The wheel assembly of the present invention comprises a wheel axle fixing plate, a large wheel, and a small wheel. As described above, the welding shaft for the universal wheel, the plate surface of the wheel axle fixing plate is provided with a large wheel axle fixing hole and a small wheel axle fixing hole near the plate head. The large wheel axle fixing hole and the small wheel axle fixing hole are distributed along the length direction of the wheel axle fixing plate. The distance between the large wheel axle fixing hole and the plate head of the wheel axle fixing plate is greater than the distance between the small wheel axle fixing hole and the plate head of the wheel axle fixing plate. The large wheel welding shaft fixing head of the large wheel welding shaft is inserted into the large wheel axle fixing hole from one plate surface of the wheel axle fixing plate and fixedly connected by welding, and the small wheel welding shaft fixing head of the small wheel welding shaft is inserted into the small wheel axle fixing hole from the other plate surface of the wheel axle fixing plate and fixedly connected by welding, the large wheel is connected to the large wheel welding shaft body of the large wheel welding shaft, and the small wheel is connected to the small wheel welding shaft body of the small wheel welding shaft.

[0019] Optionally, a weight-reducing hole is provided on the plate surface of the wheel axle fixing plate near the plate tail;

[0020] Clamping grooves are symmetrically arranged on both sides of the wheel axle fixing plate near the tail of the plate;

[0021] The shape of the engaging groove is rectangular;

[0022] Both sides of the bottom of the engaging groove extend inwards to form a clearance groove;

[0023] The large wheel welding shaft fixing head of the large wheel welding shaft is welded and fixed to the wheel shaft fixing plate;

[0024] The small wheel welding shaft fixing head of the small wheel welding shaft is welded and fixed to the wheel shaft fixing plate.

[0025] Optionally, the axle fixing plate is in the shape of a long isosceles trapezoid;

[0026] The plate head of the wheel axle fixing plate is in an arc shape.

[0027] Optionally, the large wheel and the large wheel welding shaft body are rotatably connected via a large wheel bearing;

[0028] The small wheel is rotatably connected to the small wheel welding shaft body via a small wheel bearing.

[0029] Optionally, the large wheel and the large wheel welding shaft body are connected by riveting the large wheel bearing;

[0030] The small wheel and the small wheel welding shaft body are connected by riveting the small wheel bearing.

[0031] Optionally, a large wheel fixing threaded hole is provided at the center of the end surface of the large wheel welding shaft body;

[0032] A threaded hole for fixing the small wheel is arranged at the center of the end surface of the main body of the small wheel welding shaft;

[0033] The large wheel fixing threaded hole cooperates with the corresponding large wheel fixing screw to fix the large wheel;

[0034] The small wheel fixing threaded hole cooperates with the corresponding small wheel fixing screw to fix the small wheel.

[0035] Optionally, the diameter and length of the large wheel are greater than the diameter and length of the small wheel.

[0036] Optionally, each of the large wheel and the small wheel is provided with a wear indication feature.

[0037] Optionally, anti-skid grooves are provided on the outer surfaces of the large wheel and the small wheel, and the wear warning feature is provided in the anti-skid grooves.

[0038] Optionally, the wear warning feature is a protrusion in the anti-slip groove that extends radially from the bottom surface of the anti-slip groove, and the height of the protrusion is half the depth of the anti-slip groove.

[0039] Optionally, the large wheel and the small wheel are both provided with a plurality of circles of anti-slip grooves, and each circle of the anti-slip grooves is provided with a plurality of the wear warning features; the number of the wear warning features in each circle of the anti-slip grooves is consistent with each other; and the wear warning features are evenly distributed in the anti-slip grooves.

[0040] Optionally, both the large wheel and the small wheel are rubber wheels.

[0041] Compared with the prior art, the wheel assembly of the present invention has the following beneficial effects.

[0042] The technical solution adopts the wheel assembly for the universal wheel, which includes a wheel axle fixing plate, a welding shaft, a large wheel and a small wheel. The welding shaft is the welding shaft for the universal wheel as described above. The plate surface of the wheel axle fixing plate is provided with a large wheel axle fixing hole and a small wheel axle fixing hole near the plate head. The large wheel axle fixing hole and the small wheel axle fixing hole are distributed along the length direction of the wheel axle fixing plate. The distance between the large wheel axle fixing hole and the plate head of the wheel axle fixing plate is greater than the distance between the small wheel axle fixing hole and the plate head of the wheel axle fixing plate. The large wheel welding shaft fixing head of the large wheel welding shaft is inserted into the large wheel axle fixing hole from one plate surface of the wheel axle fixing plate and fixedly connected by welding. The small wheel welding shaft fixing head of the small wheel welding shaft The fixed head is inserted into the small wheel axle fixing hole from the other plate surface of the wheel axle fixing plate and fixedly connected by welding. The large wheel is connected to the large wheel welding shaft body of the large wheel welding shaft, and the small wheel is connected to the small wheel welding shaft body of the small wheel welding shaft. The technical means is that different wheels correspond to different shaft bodies, and the distance between the large wheel axle fixing hole and the plate head of the wheel axle fixing plate is greater than the distance between the small wheel axle fixing hole and the plate head of the wheel axle fixing plate. Therefore, the welding shaft layout of the wheel assembly is more reasonable, which is conducive to the large wheel and the small wheel being evenly distributed on the same circumference, uniform force, smoother transition, more precise steering, less slipping, less wear, and long service life, which is conducive to reducing production costs and maintenance costs.

[0043] The present invention also provides a universal wheel, the welded shaft layout of the universal wheel is more reasonable, which is conducive to the large wheel and the small wheel being evenly distributed on the same circumference, the force is evenly distributed, the transition is smoother, the steering is more precise, it is less likely to slip, the wear is small, the service life is long, and it is conducive to reducing production costs and maintenance costs.

[0044] The universal wheel of the present invention comprises an outer guard plate, an outer fixing plate, an inner fixing plate, an inner guard plate, a wheel axle drive connecting piece, a plurality of wheel assemblies and a plurality of shock absorbing assemblies. The wheel axle drive connecting piece is connected to the plurality of wheel assemblies via the outer fixing plate, the inner fixing plate and the plurality of shock absorbing assemblies. The outer guard plate is fixed to the outer side of the outer fixing plate, the inner guard plate is fixed to the inner side of the inner fixing plate, and the plurality of wheel assemblies are the wheel assemblies for the universal wheel as described above.

[0045] Optionally, a plurality of the wheel assemblies are evenly arranged around the wheel axle drive connector;

[0046] The plurality of large wheels and the plurality of small wheels are arranged alternately with each other.

[0047] Optionally, the landing points of the plurality of large wheels and the plurality of small wheels are located on the same circumference. Optionally, the plurality of shock absorbing assemblies are evenly arranged along the circumference of the wheel axle drive connector;

[0048] Each of the shock absorbing components comprises a shockproof component and a limiting component. The side of the shockproof component away from the wheel axle driving connecting piece is provided with the limiting component for limiting the movement of the shockproof component.

[0049] Optionally, the shockproof component includes a sponge pad and a sponge support frame, and the sponge pad and the sponge support frame are fixedly connected.

[0050] Optionally, the sponge pad is an arc-shaped block structure, and the inner side surface of the sponge pad and the outer side surface of the sponge pad have the same curvature.

[0051] Optionally, the main body of the sponge support frame is an arc-shaped plate structure, the curvature of the inner side surface of the sponge support frame corresponds to the curvature of the outer side surface of the sponge pad, and the outer side surface of the sponge pad fits in with the inner side surface of the sponge support frame; two ends of the sponge support frame are provided with convex edges protruding toward its inner side surface, and the convex edges include a left convex edge arranged at the left end of the sponge support frame and a right convex edge arranged at the right end of the sponge support frame; the angle between the left convex edge and the sponge support frame main body and the angle between the outer side surface of the sponge pad and the left side surface of the sponge pad correspond to the angle between the right convex edge and the sponge support frame main body and the angle between the outer side surface of the sponge pad and the right side surface of the sponge pad correspond to the angle between the outer side surface of the sponge pad and the right side surface of the sponge pad; the inner side surface of the left convex edge of the sponge support frame fits in with the left side surface of the sponge pad, and the inner side surface of the right convex edge of the sponge support frame fits in with the right side surface of the sponge pad; the sponge pad is engaged with the sponge support frame.

[0052] Optionally, a plurality of shock-absorbing grooves are evenly arranged on the circumferential side of the wheel axle drive connector; the plurality of sponge pads are engaged with the plurality of shock-absorbing grooves one by one, the bottom surface of the shock-absorbing groove has the same curvature and size as the inner surface of the sponge pad, the left side wall of the shock-absorbing groove has the same inclination as the left side surface of the sponge pad and corresponds to each other; the right side wall of the shock-absorbing groove has the same inclination as the right side surface of the sponge pad and corresponds to each other; the sponge pad has an interference fit with the shock-absorbing groove.

[0053] Optionally, the bottom surface of the shock-absorbing groove is further provided with an anti-sway protrusion, and the inner side of the sponge pad is provided with an anti-sway groove, and the anti-sway protrusion is clamped in the anti-sway groove.

[0054] Optionally, each of the sponge support frames is provided with a fixing plate groove on its outer side;

[0055] The tails of the plurality of wheel axle fixing plates are inserted into the fixing plate grooves in a one-to-one correspondence.

[0056] Optionally, the outer fixing plate is detachably connected to the wheel axle drive connecting member, and the inner fixing plate is detachably connected to the wheel axle drive connecting member; the shockproof component is arranged between the outer fixing plate and the inner fixing plate;

[0057] The limiting component is fixed between the outer fixing plate and the inner fixing plate.

[0058] Optionally, the limiting component is a limiting bolt or a limiting pressure rod;

[0059] The shockproof component includes a sponge pad and a sponge support frame; the outer side of the sponge support frame is provided with a columnar protrusion, and each sponge support frame includes four columnar protrusions; every two columnar protrusions form a group, one group of columnar protrusions is arranged at the left end of the sponge support frame, and the other group of columnar protrusions is arranged at the right end of the sponge support frame, and the two groups of columnar protrusions are symmetrical to each other; the distance between the two columnar protrusions in each group is consistent and parallel to each other, and an arc surface is formed between the opposite sides of the two columnar protrusions in each group, and the inner diameter of the arc surface corresponds to the outer diameter of the limit bolt or the limit pressure rod;

[0060] The outer fixing plate is provided with a through hole, and the through hole on the outer fixing plate corresponds to the limiting bolt or the limiting pressure rod; and the inner fixing plate is provided with a through hole, and the through hole on the inner fixing plate corresponds to the limiting bolt or the limiting pressure rod;

[0061] The limiting bolt or the limiting pressure rod passes through the through hole of the outer fixing plate and the through hole on the inner fixing plate in sequence, and the limiting bolt or the limiting pressure rod is surrounded by the arc surface.

[0062] Optionally, circular through holes are provided in the centers of the outer fixing plate and the inner fixing plate, and the inner diameter of the circular through holes corresponds to the outer diameter of the main body of the wheel-axle drive connecting member; the outer fixing plate is snap-connected with the wheel-axle drive connecting member, and the inner fixing plate is snap-connected with the wheel-axle drive connecting member; the wheel-axle drive connecting member, the outer fixing plate and the inner fixing plate are coaxially arranged.

[0063] Optionally, the outer fixing plate and the inner fixing plate are respectively clamped with the wheel axle fixing plate.

[0064] Compared with the prior art, the universal wheel of the present invention has the following beneficial effects.

[0065] The technical solution adopts the universal wheel, including an outer guard plate, an outer fixing plate, a wheel axle drive connecting piece, multiple wheel assemblies, an inner fixing plate, an inner guard plate, and multiple shock-absorbing assemblies. The wheel axle drive connecting piece and the multiple wheel assemblies are connected through the outer fixing plate, the inner right fixing plate and the multiple shock-absorbing assemblies. The outer guard plate is fixed to the outer side of the outer fixing plate, and the inner guard plate is fixed to the inner side of the inner fixing plate. The multiple wheel assemblies are the technical means of the wheel assemblies used for the universal wheel as mentioned above. Since different wheels correspond to different shaft bodies, and the distance between the large wheel axle fixing hole and the plate head of the wheel axle fixing plate is greater than the distance between the small wheel axle fixing hole and the plate head of the wheel axle fixing plate, the welded shaft layout of the universal wheel is more reasonable, which is conducive to the large wheel and the small wheel being evenly distributed on the same circumference, the force is even, the transition is smoother, the steering is more precise, it is less likely to slip, the wear is small, the service life is long, and it is conducive to reducing production costs and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. The drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0067] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. Obviously, the drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0068] Figure 1 This is a schematic diagram of the structure of a welded shaft for a universal wheel according to an embodiment of the present invention;

[0069] Figure 2 A schematic structural diagram of a large wheel welding shaft for a universal wheel according to an embodiment of the present invention;

[0070] Figure 3 A schematic diagram of the structure of a small wheel welding shaft for a universal wheel according to an embodiment of the present invention;

[0071] Figure 4 A schematic diagram of the structure of the axle fixing plate of the welded axle used in the universal wheel according to an embodiment of the present invention;

[0072] Figure 5 This is a schematic diagram of the structure of a wheel assembly according to an embodiment of the present invention;

[0073] Figure 6This is a schematic diagram of the universal wheel structure according to an embodiment of the present invention;

[0074] Figure 7 This is a schematic diagram of the exploded structure of the universal wheel according to an embodiment of the present invention;

[0075] Figure 8 It is an assembly diagram of the wheel axle driving connector and the wheel axle fixing plate according to an embodiment of the present invention;

[0076] Fig. 9 This is a schematic structural diagram of a large wheel according to an embodiment of the present invention;

[0077] Fig.10 Schematic diagram of the structure of the shockproof component of an embodiment of the present invention.

[0078] Icon: 1-External guard plate;

[0079] 2-outer fixing plate; 201-through hole; 202-circular through hole;

[0080] 3-wheel axle drive connector; 301-shock absorbing groove; 302-anti-sway protrusion;

[0081] 4-big wheel; 401-big wheel bearing; 402-wear reminder feature; 403-anti-slip groove;

[0082] 5- small wheel;

[0083] 6-wheel axle fixing plate; 601-large wheel axle fixing hole; 602-small wheel axle fixing hole; 603-weight reduction hole; 604-clamping slot; 605-giving slot;

[0084] 7-big wheel welding shaft; 701-big wheel welding shaft body; 702-big wheel welding shaft fixing head; 703-big wheel welding shaft retaining ring; 704-big wheel fixing threaded hole;

[0085] 8- small wheel welding shaft; 801- small wheel welding shaft body; 802- small wheel welding shaft fixing head; 803- small wheel welding shaft retaining ring; 804- small wheel fixing threaded hole;

[0086] 9-inner fixing plate; 10-inner guard plate; 11-shock absorbing assembly;

[0087] 12- shockproof component; 121- sponge pad; 122- sponge support frame; 1211- anti-sway groove; 1221- convex edge; 1222- fixed plate groove; 1223- columnar protrusion; 13- limiting component. DETAILED DESCRIPTION

[0088] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0089] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0090] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0091] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0092] like Figures 1 to 10 As shown, in this embodiment, a welding shaft for a universal wheel is provided, and the welding shaft for the universal wheel includes a large wheel welding shaft 7 and a small wheel welding shaft 8. The large wheel welding shaft 7 includes a large wheel welding shaft body 701, a large wheel welding shaft retaining ring 703, and a large wheel welding shaft fixing head 702 which are sequentially integrated; the small wheel welding shaft 8 includes a small wheel welding shaft body 801, a small wheel welding shaft retaining ring 803, and a small wheel welding shaft fixing head 802 which are sequentially integrated.

[0093] Compared with the prior art, the welded shaft for the universal wheel of the present invention has the following beneficial effects.

[0094] The technical solution adopts the technical means that the welding shaft includes a large wheel welding shaft 7 and a small wheel welding shaft 8, the large wheel welding shaft 7 includes a large wheel welding shaft body 701, a large wheel welding shaft retaining ring 703, and a large wheel welding shaft fixing head 702 which are sequentially formed into an integral part; the small wheel welding shaft 8 includes a small wheel welding shaft body 801, a small wheel welding shaft retaining ring 803, and a small wheel welding shaft fixing head 802 which are sequentially formed into an integral part. Different wheels correspond to different shaft body settings, so the layout is more reasonable, which is conducive to uniform distribution of the landing points of the large wheel and the small wheel on the same circumference, uniform force, smoother transition, more precise steering, less slipping, less wear, and a long service life, which is conducive to reducing production costs and maintenance costs.

[0095] like Figures 1 to 10 As shown, in the optional solution of this embodiment,

[0096] The large wheel welding shaft body 701, the large wheel welding shaft retaining ring 703, and the large wheel welding shaft fixing head 702 are located on the same axis;

[0097] The small wheel welding shaft body 801, the small wheel welding shaft retaining ring 803, and the small wheel welding shaft fixing head 802 are located on the same axis;

[0098] The length of the large wheel welding shaft body 701 is greater than the length of the small wheel welding shaft body 801 .

[0099] The stop ring is set to facilitate welding and fixing. Different length settings are designed for different sizes of wheels to facilitate installation and balancing.

[0100] Preferably, the shape of the large wheel welding shaft retaining ring 703 is a perfect circular shape;

[0101] The shape of the small wheel welding shaft retaining ring 803 is a perfect circular shape;

[0102] The optimal circular shape is to avoid hole design and facilitate processing and installation.

[0103] The present embodiment further provides a wheel assembly, including a wheel axle fixing plate 6, a large wheel 4, a small wheel 5, and a welding shaft for a universal wheel as described above. The plate surface of the wheel axle fixing plate 6 is provided with a large wheel axle fixing hole 601 and a small wheel axle fixing hole 602 near the plate head. The large wheel axle fixing hole 601 and the small wheel axle fixing hole 602 are distributed along the length direction of the wheel axle fixing plate 6. The distance between the large wheel axle fixing hole 601 and the plate head of the wheel axle fixing plate 6 is greater than the distance between the small wheel axle fixing hole 602 and the plate head of the wheel axle fixing plate 6. The large wheel welding shaft fixing head 702 of the large wheel welding shaft 7 is from the wheel axle fixing plate 6. One plate surface is inserted into the large wheel axle fixing hole 601 and fixedly connected by welding, the small wheel welding shaft fixing head 802 of the small wheel welding shaft 8 is inserted into the small wheel axle fixing hole 602 from the other plate surface of the wheel axle fixing plate 6 and fixedly connected by welding, the large wheel 4 is connected to the large wheel welding shaft body 701 of the large wheel welding shaft 7, and the small wheel 5 is connected to the small wheel welding shaft body 801 of the small wheel welding shaft 8. Preferably, a large wheel 4 and a small wheel 5 with a diameter difference corresponding to the distance between the large wheel axle fixing hole 601 and the small wheel axle fixing hole 602 are used, so that the landing point of the large wheel 4 and the landing point of the small wheel 5 are located on the same circumference.

[0104] Compared with the prior art, the wheel assembly of the present invention has the following beneficial effects.

[0105] This technical solution adopts the wheel assembly for the universal wheel, which includes a wheel axle fixing plate 6, a welding shaft, a large wheel 4, and a small wheel 5. The welding shaft is the welding shaft for the universal wheel as described above. Since the distance between the large wheel axle fixing hole 601 and the plate head of the wheel axle fixing plate 6 is greater than the distance between the small wheel axle fixing hole 602 and the plate head of the wheel axle fixing plate 6, and since different wheels correspond to different axle bodies, the layout of the welding shaft of the wheel assembly is more reasonable, which is conducive to the uniform distribution of the force points of the large wheel and the small wheel on the same circumference, uniform force, smoother transition, more precise steering, less prone to slipping, less wear, and long service life, which is conducive to reducing production costs and maintenance costs. At the same time, due to the coordination of the hole, the welding shaft fixing head and the retaining ring, the shaft and the plate are easy to position during welding, not easy to make a sound deviation, and convenient welding.

[0106] like Figures 1 to 10 As shown, in an optional solution of this embodiment, the shape of the wheel axle fixing plate 6 is a long isosceles trapezoid;

[0107] The head of the wheel axle fixing plate 6 is in an arc shape;

[0108] The wheel axle fixing plate 6 is provided with a weight-reducing hole 603 on its surface near the tail;

[0109] The two sides of the wheel axle fixing plate 6 are symmetrically provided with engaging grooves 604 near the plate tail;

[0110] The shape of the engaging groove 604 is rectangular;

[0111] The two sides of the bottom of the engaging groove 604 extend inwards to form a clearance groove 605;

[0112] The large wheel welding shaft fixing head 702 of the large wheel welding shaft 7 is fixed to the wheel shaft fixing plate 6 by welding.

[0113] The small wheel welding shaft fixing head 802 of the small wheel welding shaft 8 is fixed to the wheel shaft fixing plate 6 by welding.

[0114] The shape of the wheel axle fixing plate 6 can be set to different shapes as needed, and the weight reduction hole 603 can be set to effectively reduce weight. By setting the engaging groove 604, the wheel axle fixing plate 6 can be engaged with the inner and outer fixing plates.

[0115] like Figures 1 to 10 As shown, in an optional solution of this embodiment, the large wheel 4 is rotatably connected to the large wheel welding shaft body 701 through a large wheel bearing 401;

[0116] The small wheel 5 is rotatably connected to the small wheel welding shaft body 801 via a small wheel bearing.

[0117] The rotation is smooth, stable and fast through the bearing connection. Preferably, both ends of the large wheel 4 are provided with large wheel bearings 401, and both ends of the small wheel 5 are provided with small wheel bearings.

[0118] Furthermore, the large wheel 4 and the large wheel welding shaft body 701 are connected by riveting through the large wheel bearing 401;

[0119] The small wheel 5 and the small wheel welding shaft body 801 are connected by riveting the small wheel bearing.

[0120] The use of a riveting machine for riveting connection makes assembly faster and more convenient, improves production efficiency, reduces production costs, and is conducive to mass production.

[0121] Alternatively, a large wheel fixing threaded hole 704 is provided at the center of the end surface of the large wheel welding shaft body 701;

[0122] A small wheel fixing threaded hole 804 is provided at the center of the end surface of the small wheel welding shaft body 801;

[0123] The large wheel fixing threaded hole 704 cooperates with the corresponding large wheel fixing screw to fix the large wheel 4;

[0124] The small wheel fixing threaded hole 804 cooperates with the corresponding small wheel fixing screw to fix the small wheel 5.

[0125] The threaded fixing method is also more convenient and firm, and it is easier to disassemble and install.

[0126] like Figures 1 to 10 As shown, in an optional solution of this embodiment, the diameter and length of the large wheel 4 are greater than the diameter and length of the small wheel 5.

[0127] By designing the large wheel and the small wheel with different diameters, the points of force are on the same circumference, making the driving more stable.

[0128] like Figures 1 to 10 As shown, in an optional solution of this embodiment, each of the large wheel 4 and the small wheel 5 is provided with a wear indication feature 402 .

[0129] The rubber wheel is provided with a wear reminder feature 402 to help the user make a well-founded judgment on whether to replace the rubber wheel, thereby avoiding the wheelchair slipping caused by untimely replacement of the rubber wheel and avoiding the waste caused by replacing the rubber wheel too frequently.

[0130] Furthermore, anti-skid grooves 403 are provided on the outer surfaces of the large wheel 4 and the small wheel 5 , and the wear indication feature 402 is provided in the anti-skid grooves 403 .

[0131] This provides convenience for the user's observation and judgment. The user can understand the degree of wear of the anti-skid groove 403 by observing the depth of the top surface of the wear indication feature 402 in the anti-skid groove 403. When the top surface of the wear indication feature 402 in the anti-skid groove 403 is flush with the outer surface of the rubber wheel, the user can quickly make a judgment to replace the rubber wheel.

[0132] Furthermore, the wear warning feature 402 is a protrusion extending radially from the bottom surface of the anti-slip groove 403 in the anti-slip groove 403 , and the height of the protrusion is half of the depth of the anti-slip groove 403 .

[0133] The wear warning feature 402 is effectively prevented from falling off. The difference between the height of the protrusion and the depth of the anti-slip groove 403 is the safety distance. During use, when the top surface of the wear warning feature 402 is flush with the outer surface of the rubber wheel, the user can quickly make a decision to replace the rubber wheel.

[0134] Preferably, the large wheel 4 and the small wheel 5 are both provided with a plurality of circles of anti-slip grooves 403, and each circle of the anti-slip grooves 403 is provided with a plurality of the wear warning features 402; the number of the wear warning features 402 in each circle of the anti-slip grooves 403 is consistent with each other; and the wear warning features 402 are evenly distributed in the anti-slip grooves 403.

[0135] The wear warning features 402 are distributed in the grooves of each circle. When some circles of the rubber wheel are worn and some circles are not worn, the rubber wheel will not be replaced in time because only the unworn wear warning features 402 are observed because the wear warning features 402 are not set in some circles where the wear is located.

[0136] Preferably, the large wheel 4 and the small wheel 5 are both rubber wheels.

[0137] The large wheel 4 and the small wheel 5 can be rubber wheels or metal wheels or wheels made of other materials, which can be selected according to needs.

[0138] The points of force are on the same circumference, so the driving is more stable, there will be no bumps, it can move smoothly, and the comfort is stronger. There will be no situation where some wheels are severely worn while others are not worn yet.

[0139] The present embodiment also provides a universal wheel, which includes an outer guard plate 1, an outer fixing plate 2, an inner fixing plate 9, an inner guard plate 10, a wheel axle drive connector 3, multiple wheel assemblies and multiple shock-absorbing assemblies 11. The wheel axle drive connector 3 is connected to the multiple wheel assemblies through the outer fixing plate 2 and the inner fixing plate 9 and the multiple shock-absorbing assemblies 11. The outer guard plate 1 is fixed to the outer side of the outer fixing plate 2, and the inner guard plate 10 is fixed to the inner side of the inner fixing plate 9. The multiple wheel assemblies are the wheel assemblies for the universal wheel as described above.

[0140] The wheel assembly including the above-mentioned welded shaft is conducive to evenly distributing the force points of the large wheel and the small wheel on the same circumference, evenly receiving the force, smoother transition, more precise steering, less prone to slipping, less wear, long service life, and conducive to reducing production costs and maintenance costs. At the same time, the entire assembly is detachably connected, which is conducive to the replacement of components and convenient repair when damaged.

[0141] like Figures 1 to 10 As shown, in an optional solution of this embodiment, a plurality of wheel assemblies are evenly arranged around the wheel axle driving connector 3;

[0142] The plurality of large wheels 4 and the plurality of small wheels 5 are arranged alternately with each other.

[0143] The large wheel 4 and the small wheel 5 are arranged at intervals from each other, so that the entire wheel is subjected to more uniform force and runs more smoothly during driving.

[0144] Furthermore, the landing points of the plurality of large wheels and the plurality of small wheels are located on the same circumference.

[0145] like Figures 1 to 10 As shown, in the optional solution of this embodiment, the wheel assemblies have twelve, ten, eight, or six;

[0146] The number of the shock absorbing components 11 may be twelve, ten, eight, or six.

[0147] You can set different numbers as needed so you can choose according to your needs.

[0148] like Figures 1 to 10 As shown, in an optional solution of this embodiment, a plurality of the shock absorbing assemblies 11 are evenly arranged along the circumference of the wheel axle driving connector 3;

[0149] Each of the shock absorbing components 11 includes a shockproof component 12 and a limiting component 13 . The side of the shockproof component 12 away from the wheel axle driving connector 3 is provided with the limiting component 13 for limiting the movement of the shockproof component 12 .

[0150] The evenly arranged shock-absorbing components 11 can evenly absorb shock, and can effectively reduce vibration when the entire wheel body rotates, thereby reducing the loss and wear of parts and improving the comfort of users.

[0151] Furthermore, the shockproof component 12 includes a sponge pad 121 and a sponge support frame 122 , and the sponge pad 121 and the sponge support frame 122 are fixedly connected.

[0152] The sponge pad 121 is supported by the sponge support frame 122, and shock absorption is performed by the sponge pad 121. The sponge pad 121 has an excellent shock absorption effect and can effectively avoid shock.

[0153] Furthermore, the sponge pad 121 is an arc-shaped block structure, and the inner side surface of the sponge pad 121 and the outer side surface of the sponge pad 121 have the same curvature.

[0154] The arc-shaped block structure is convenient for being arranged around the annular wheel axle drive connector 3, and the curvatures of the inner and outer sides are consistent, making it more convenient to arrange.

[0155] Furthermore, the main body of the sponge support frame 122 is an arc-shaped plate-like structure, the curvature of the inner side surface of the sponge support frame 122 corresponds to the curvature of the outer side surface of the sponge pad 121, and the outer side surface of the sponge pad 121 fits with the inner side surface of the sponge support frame 122; both ends of the sponge support frame 122 are provided with convex edges 1221 protruding toward the inner side surface thereof, and the convex edges 1221 include a left convex edge provided at the left end of the sponge support frame 122 and a right convex edge provided at the right end of the sponge support frame 122; the left convex edge and the sponge support frame The angle between the main body of sponge support frame 122 corresponds to the angle between the outer side surface of the sponge pad 121 and the left side surface of the sponge pad 121, the angle between the right convex edge and the main body of the sponge support frame 122 corresponds to the angle between the outer side surface of the sponge pad 121 and the right side surface of the sponge pad 121; the inner side surface of the left convex edge of the sponge support frame 122 fits with the left side surface of the sponge pad 121, and the inner side surface of the right convex edge of the sponge support frame 122 fits with the right side surface of the sponge pad 121; the sponge pad 121 is engaged with the sponge support frame 122.

[0156] The sponge pad 121 is clamped by the convex edges 1221 on both sides, so that the sponge pad 121 is not easy to fall off. The curvature is set to be consistent and fit, which can more effectively support the sponge pad 121.

[0157] Preferably, a plurality of shock-absorbing grooves 301 are evenly arranged on the circumferential side of the wheel-axle drive connector 3; the plurality of sponge pads 121 are engaged with the plurality of shock-absorbing grooves 301 one by one, the bottom surface of the shock-absorbing groove 301 has the same curvature and size as the inner surface of the sponge pad 121, the left side wall of the shock-absorbing groove 301 has the same inclination as the left side surface of the sponge pad 121 and corresponds to each other; the right side wall of the shock-absorbing groove 301 has the same inclination as the right side surface of the sponge pad 121 and corresponds to each other; the sponge pad 121 and the shock-absorbing groove 301 have an interference fit.

[0158] Through interference fit, the sponge pad 121 is stuck in the shock-absorbing groove 301, so that the sponge pad 121 is not easy to fall off, and the sponge pad 121 is effectively fixed to achieve a shock-absorbing effect.

[0159] Furthermore, an anti-sway protrusion 302 is provided on the bottom surface of the shock-absorbing groove 301 , and an anti-sway groove 1211 is provided on the inner side of the sponge pad 121 , and the anti-sway protrusion 302 is clamped in the anti-sway groove 1211 .

[0160] Through the cooperation between the anti-sway groove 1211 and the anti-sway protrusion 302 , the sponge pad 121 is more effectively fixed and is not easy to shake.

[0161] Optionally, each of the sponge support frames 122 is provided with a fixing plate groove 1222 on its outer side;

[0162] The tails of the plurality of wheel axle fixing plates 6 are inserted into the fixing plate grooves 1222 in a one-to-one correspondence.

[0163] Such arrangement facilitates installation and limiting of the axle fixing plate 6, and plays a role in damping and limiting the axle fixing plate 6. Preferably, the bottom of the fixing plate groove 1222 is embedded in the outer wall of the sponge pad 121, so that it can be more effectively damped.

[0164] like Figures 1 to 10 As shown, in an optional solution of this embodiment, the outer fixing plate 2 is detachably connected to the wheel axle drive connecting member 3, and the inner fixing plate 9 is detachably connected to the wheel axle drive connecting member 3; the shockproof component 12 is arranged between the outer fixing plate 2 and the inner fixing plate 9;

[0165] The limiting component 13 is fixed between the outer fixing plate 2 and the inner fixing plate 9 .

[0166] The various parts are detachably connected, making it easier to disassemble and replace components and to repair them after they are damaged.

[0167] Preferably, the limiting component 13 is a limiting bolt or a limiting pressure rod;

[0168] The shockproof component 12 includes a sponge pad 121 and a sponge support frame 122; a columnar protrusion 1223 is provided on the outer side of the sponge support frame 122, and each sponge support frame 122 includes four columnar protrusions 1223; every two columnar protrusions 1223 form a group, one group of the columnar protrusions 1223 is arranged at the left end of the sponge support frame 122, and the other group of the columnar protrusions 1223 is arranged at the right end of the sponge support frame 122, and the two groups of the columnar protrusions 1223 are symmetrical to each other; the distance between the two columnar protrusions 1223 in each group is consistent and parallel to each other, and an arc surface is formed between the opposite sides of the two columnar protrusions 1223 in each group, and the inner diameter of the arc surface corresponds to the outer diameter of the limiting bolt or the limiting pressure rod;

[0169] The outer fixing plate 2 is provided with a through hole 201, and the through hole 201 on the outer fixing plate 2 corresponds to the limiting bolt or limiting pressure rod; and the inner fixing plate 9 is provided with a through hole 201, and the through hole 201 on the inner fixing plate 9 corresponds to the limiting bolt or limiting pressure rod;

[0170] The limiting bolt or the limiting pressure rod passes through the through hole 201 of the outer fixing plate 2 and the through hole 201 on the inner fixing plate 9 in sequence, and the limiting bolt or the limiting pressure rod is surrounded by the arc surface.

[0171] The entire damping component and the axle fixing plate 6 are fixed by bolts or limiting pressure rods, so that the entire device can be easily disassembled. Meanwhile, the setting of the arc surface can also play a positioning and limiting effect.

[0172] Furthermore, circular through holes 202 are provided at the centers of the outer fixing plate 2 and the inner fixing plate 9, and the inner diameter of the circular through hole 202 corresponds to the outer diameter of the main body of the wheel axle drive connecting member 3; the outer fixing plate 2 is snap-connected with the wheel axle drive connecting member 3, and the inner fixing plate 9 is snap-connected with the wheel axle drive connecting member 3; the wheel axle drive connecting member 3, the outer fixing plate 2 and the inner fixing plate 9 are coaxially arranged.

[0173] The clamping method is convenient for disassembly and can be disassembled and fixed through the fixing plates on both sides, which is firm and easy to disassemble.

[0174] Furthermore, the outer fixing plate 2 and the inner fixing plate 9 are respectively engaged with the engaging grooves 604 on both sides of the axle fixing plate 6 .

[0175] Fixing the axle fixing plate 6 by means of snap-fitting is simple and easy to implement, and the fixing is firm and convenient to disassemble.

[0176] Finally, it should be noted that it is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and therefore it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present application.

[0177] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A universal wheel, characterized in that: The invention comprises an outer guard plate, an outer fixing plate, an inner fixing plate, an inner guard plate, a wheel axle drive connecting member, a plurality of wheel assemblies and a plurality of shock absorbing assemblies; the wheel axle drive connecting member is connected to the plurality of wheel assemblies through the outer fixing plate, the inner fixing plate and the plurality of shock absorbing assemblies, the outer guard plate is fixed to the outer side of the outer fixing plate, and the inner guard plate is fixed to the inner side of the inner fixing plate; The wheel assembly includes: a wheel axle fixing plate, a large wheel, a small wheel, and a welding shaft for a universal wheel; a large wheel axle fixing hole and a small wheel axle fixing hole are distributed on the surface of the wheel axle fixing plate near the plate head; the large wheel axle fixing hole and the small wheel axle fixing hole are distributed along the length direction of the wheel axle fixing plate, and the distance between the large wheel axle fixing hole and the plate head of the wheel axle fixing plate is greater than the distance between the small wheel axle fixing hole and the plate head of the wheel axle fixing plate; the welding shaft includes a large wheel welding shaft and a small wheel welding shaft, and the large wheel welding shaft includes a large wheel welding shaft body, a large wheel welding shaft retaining ring, and a large wheel welding shaft fixing head that are sequentially integrated; the large wheel welding shaft body, the large wheel welding shaft retaining ring, and the large wheel welding shaft fixing head are located on the same axis; the small wheel welding shaft includes The small wheel welding shaft body, the small wheel welding shaft retaining ring, and the small wheel welding shaft fixing head sequentially constitute an integral part; the small wheel welding shaft body, the small wheel welding shaft retaining ring, and the small wheel welding shaft fixing head are located on the same axis; the length of the large wheel welding shaft body is greater than the length of the small wheel welding shaft body; the large wheel welding shaft fixing head of the large wheel welding shaft is inserted into the large wheel shaft fixing hole from one plate surface of the wheel shaft fixing plate and fixedly connected by welding, and the small wheel welding shaft fixing head of the small wheel welding shaft is inserted into the small wheel shaft fixing hole from the other plate surface of the wheel shaft fixing plate and fixedly connected by welding; the large wheel is connected to the large wheel welding shaft body of the large wheel welding shaft, and the small wheel is connected to the small wheel welding shaft body of the small wheel welding shaft; The shape of the large wheel welding shaft retaining ring is an excellent circular notch shape; The shape of the small wheel welding shaft retaining ring is an excellent circular notch shape; The wheel axle fixing plate is provided with a weight-reducing hole on its plate surface near the plate tail; the wheel axle fixing plate is symmetrically provided with engaging grooves on both sides near the plate tail; the engaging grooves are rectangular in shape; the bottom sides of the engaging grooves extend inward to form a clearance groove; the large wheel welding shaft fixing head of the large wheel welding shaft is welded and fixed to the wheel axle fixing plate; the small wheel welding shaft fixing head of the small wheel welding shaft is welded and fixed to the wheel axle fixing plate; A plurality of the wheel assemblies are evenly arranged around the wheel axle drive connector; The plurality of large wheels and the plurality of small wheels are arranged alternately with each other; The landing points of the plurality of large wheels and the plurality of small wheels are located on the same circumference; A plurality of the shock absorbing assemblies are evenly arranged along the circumference of the wheel axle drive connecting member; each of the shock absorbing assemblies comprises a shockproof component and a limiting component, and the side of the shockproof component away from the wheel axle drive connecting member is provided with the limiting component for limiting the movement of the shockproof component; The shockproof component includes a sponge pad and a sponge support frame, and the sponge pad and the sponge support frame are fixedly connected; The sponge pad is an arc-shaped block structure, and the inner side of the sponge pad and the outer side of the sponge pad have the same curvature; The main body of the sponge support frame is an arc-shaped plate-shaped structure, the curvature of the inner side surface of the sponge support frame corresponds to the curvature of the outer side surface of the sponge pad, and the outer side surface of the sponge pad fits with the inner side surface of the sponge support frame; both ends of the sponge support frame are provided with convex edges protruding toward its inner side surface, and the convex edges include a left convex edge arranged at the left end of the sponge support frame and a right convex edge arranged at the right end of the sponge support frame; the angle between the left convex edge and the main body of the sponge support frame and the angle between the outer side surface of the sponge pad and the left side surface of the sponge pad correspond to the angle between the right convex edge and the main body of the sponge support frame and the angle between the outer side surface of the sponge pad and the right side surface of the sponge pad correspond to the angle between the inner side surface of the sponge pad and the right side surface of the sponge pad; the inner side surface of the left convex edge of the sponge support frame fits with the left side surface of the sponge pad, and the inner side surface of the right convex edge of the sponge support frame fits with the right side surface of the sponge pad; the sponge pad is engaged with the sponge support frame; The circumferential side of the wheel axle drive connector is evenly provided with a plurality of shock-absorbing grooves; the plurality of sponge pads are engaged with the plurality of shock-absorbing grooves one by one, the bottom surface of the shock-absorbing groove is consistent with the curvature and size of the inner surface of the sponge pad, the left side wall of the shock-absorbing groove is consistent with the left side surface of the sponge pad and corresponds to each other; the right side wall of the shock-absorbing groove is consistent with the right side surface of the sponge pad and corresponds to each other; the sponge pad is interference fit with the shock-absorbing groove; The bottom surface of the shock-absorbing groove is also provided with an anti-sway protrusion, the inner side of the sponge pad is provided with an anti-sway groove, and the anti-sway protrusion is clamped in the anti-sway groove; A fixing plate groove is arranged on the outer side surface of each sponge support frame; the tails of the plurality of wheel axle fixing plates are inserted into the fixing plate groove in a one-to-one correspondence.

2. The universal wheel according to claim 1, characterized in that: The shape of the wheel axle fixing plate is a long isosceles trapezoid; the plate head of the wheel axle fixing plate is an arc shape.

3. The universal wheel according to claim 1, characterized in that: The large wheel is rotatably connected to the large wheel welding shaft body via a large wheel bearing; the small wheel is rotatably connected to the small wheel welding shaft body via a small wheel bearing.

4. The universal wheel according to claim 3, characterized in that: The large wheel and the large wheel welding shaft body are riveted and connected via the large wheel bearing; the small wheel and the small wheel welding shaft body are riveted and connected via the small wheel bearing.

5. The universal wheel according to claim 4, characterized in that: A large wheel fixing threaded hole is arranged at the center of the end surface of the large wheel welding shaft body; a small wheel fixing threaded hole is arranged at the center of the end surface of the small wheel welding shaft body; the large wheel fixing threaded hole cooperates with the corresponding large wheel fixing screw to fix the large wheel; the small wheel fixing threaded hole cooperates with the corresponding small wheel fixing screw to fix the small wheel.

6. The universal wheel according to claim 1, characterized in that: The diameter and length of the large wheel are greater than the diameter and length of the small wheel.

7. The universal wheel according to claim 1, characterized in that: Each of the large wheel and the small wheel is provided with a wear indication feature.

8. The universal wheel according to claim 7, characterized in that: Anti-skid grooves are arranged on the outer surfaces of the large wheel and the small wheel, and the wear prompting features are arranged in the anti-skid grooves.

9. The universal wheel according to claim 8, characterized in that: The wear reminder feature is a protrusion extending radially from the bottom surface of the anti-slip groove in the anti-slip groove, and the height of the protrusion is half the depth of the anti-slip groove.

10. The universal wheel according to claim 8, characterized in that: The large wheel and the small wheel are both provided with a plurality of circles of anti-skid grooves, and each circle of the anti-skid grooves is provided with a plurality of the wear indication features; the number of the wear indication features in each circle of the anti-skid grooves is consistent with each other; and the wear indication features are evenly distributed in the anti-skid grooves.

11. The universal wheel according to any one of claims 1 to 10, characterized in that: The large wheel and the small wheel are both rubber wheels.

12. The universal wheel according to claim 1, characterized in that: The outer fixing plate is detachably connected to the wheel axle drive connecting member, and the inner fixing plate is detachably connected to the wheel axle drive connecting member; the shockproof component is arranged between the outer fixing plate and the inner fixing plate; the limiting component is fixed between the outer fixing plate and the inner fixing plate.

13. The universal wheel according to claim 12, characterized in that: The limiting component is a limiting bolt or a limiting pressure rod; the shockproof component includes a sponge pad and a sponge support frame; the outer side of the sponge support frame is provided with a columnar protrusion, and each sponge support frame includes four columnar protrusions; every two columnar protrusions form a group, one group of columnar protrusions is arranged at the left end of the sponge support frame, and the other group of columnar protrusions is arranged at the right end of the sponge support frame, and the two groups of columnar protrusions are symmetrical to each other; the distance between the two columnar protrusions in each group is consistent and parallel to each other, and the opposite sides of the two columnar protrusions in each group are formed. The inner diameter of the arc surface corresponds to the outer diameter of the limit bolt or the limit pressure rod; the outer fixing plate is provided with a through hole, and the through hole on the outer fixing plate corresponds to the limit bolt or the limit pressure rod; and the inner fixing plate is provided with a through hole, and the through hole on the inner fixing plate corresponds to the limit bolt or the limit pressure rod; the limit bolt or the limit pressure rod passes through the through hole of the outer fixing plate and the through hole on the inner fixing plate in sequence, and the limit bolt or the limit pressure rod is surrounded by the arc surface.

14. The universal wheel according to claim 12, characterized in that: The centers of the outer fixing plate and the inner fixing plate are provided with circular through holes, the inner diameter of the circular through holes corresponds to the outer diameter of the main body of the wheel axle drive connecting member; the outer fixing plate is snap-connected with the wheel axle drive connecting member, and the inner fixing plate is snap-connected with the wheel axle drive connecting member; the wheel axle drive connecting member, the outer fixing plate and the inner fixing plate are coaxially arranged.

15. The universal wheel according to claim 12, characterized in that: The outer fixing plate and the inner fixing plate are respectively clamped with the wheel axle fixing plate.

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