Roller bed, conveying system and production line

Abstract

The utility model provides a roller bed, a conveying system and a production line. The roller bed comprises a conveying frame, a first roller bed and a second roller bed, wherein a first station is arranged on the conveying frame; a conveying wheel set; the conveying wheel set is arranged on the conveying frame. Wherein the conveying wheel set comprises a rigid conveying positioning wheel and a rubber coating conveying wheel which are arranged on the first station; the rubber coating conveying wheel comprises a hub; the outer diameter of the rigid conveying positioning wheel is larger than that of the hub and smaller than that of the rubber coating conveying wheel. According to the roller bed provided by the embodiment of the invention, the characteristic that the rigid conveying positioning wheel is not easy to generate elastic deformation under the action of the propping pressure of the carrier is utilized, so that when the carrier moves to the first station, the carrier does not move downwards after being propped against the rigid conveying positioning wheel under the action of gravity; therefore, accurate positioning of the carrier in the vertical direction is achieved through the rigid conveying positioning wheels.

Description

Roller beds, conveyor systems and production lines Technical Field

[0001] This application relates to the field of manufacturing technology, specifically to a roller bed, a conveying system, and a production line. Background Technology

[0002] In existing automobile manufacturing workshops, the movement of automotive parts between different production lines or different workstations on the same production line is typically achieved using automated conveyor systems. This improves the flexibility and efficiency of logistics within the workshop, thereby increasing automobile production efficiency and shortening the vehicle production cycle. Specifically, the conveyor system may include roller beds and carriers (such as skids) that can be mounted on the roller beds. Under the action of driving force, the carriers carrying vehicle parts move automatically or semi-automatically on the roller beds.

[0003] When a carrier carrying vehicle parts moves to certain processing stations, the carrier needs to be positioned to improve the processing accuracy of the vehicle parts and enhance the production quality of the production line. However, in actual production, it has been found that it is difficult to accurately position the carrier in the vertical direction using existing roller beds. Summary of the Invention

[0004] In view of this, several embodiments of this specification provide a roller bed, a conveying system, and a production line for positioning a carrier in the vertical direction.

[0005] One embodiment of this specification provides a roller bed, the roller bed comprising: a conveyor frame, the conveyor frame having a first station; a conveyor wheel assembly; the conveyor wheel assembly being disposed on the conveyor frame; wherein, the conveyor wheel assembly includes a rigid conveyor positioning wheel and a rubber-coated conveyor wheel disposed at the first station; the rubber-coated conveyor wheel includes a hub; the outer diameter of the rigid conveyor positioning wheel is larger than the outer diameter of the hub and smaller than the outer diameter of the rubber-coated conveyor wheel.

[0006] Optionally, the outer diameter of the rigid conveyor positioning wheel is 0.3mm to 0.5mm smaller than the outer diameter of the rubber-coated conveyor wheel.

[0007] Optionally, the conveyor wheel set includes at least two rows of sub-conveyor wheel sets; each row of the sub-conveyor wheel set includes the rigid conveyor positioning wheel and the rubber-coated conveyor wheel arranged along the conveying direction.

[0008] Optionally, the conveyor frame has a conveying direction; along the conveying direction, at each of the first workstations, the rubber-coated conveyor wheels are provided on both sides of the rigid conveyor positioning wheel.

[0009] Optionally, the rigid conveying and positioning wheel is a metal wheel, a metal-ceramic wheel, or a carbon fiber composite wheel.

[0010] Optionally, the rubber-coated conveyor wheel includes a rubber-coated ring fitted onto the hub, the rubber-coated ring being a polyurethane ring, a rubber ring, or an epoxy resin ring. Optionally, the roller bed further includes a height-limiting structure, the height-limiting structure being used to limit the vertical height of a carrier that can be mounted on the roller bed.

[0011] One embodiment of this specification provides a conveying system including a roller bed as described in the above embodiments and a carrier that can be disposed on the roller bed.

[0012] Optionally, the height limiting structure and the vehicle have a reserved gap in the vertical direction, the size of which falls within the range of 0.1mm to 0.2mm.

[0013] One embodiment of this specification provides a production line that includes a roller bed or a conveying system as described in the above embodiments.

[0014] In several embodiments provided in this specification, a conveyor wheel assembly including a rigid conveyor positioning wheel and a rubber-coated conveyor wheel is set at the first station on the roller bed conveyor frame. The rubber-coated conveyor wheel includes a hub, and the outer diameter of the rigid conveyor positioning wheel is larger than the outer diameter of the hub and smaller than the outer diameter of the rubber-coated conveyor wheel. Since the rigid conveyor positioning wheel is not prone to elastic deformation under the pressure of the carrier, when the carrier moves to the first station, it stops moving downward after contacting the rigid conveyor positioning wheel under the action of gravity. Thus, the rigid conveyor positioning wheel is used to achieve accurate positioning of the carrier in the vertical direction. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this specification, the accompanying drawings used in describing the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 is a three-dimensional structural diagram of a roller bed provided in one embodiment of this specification.

[0017] Figure 2 is a schematic diagram of the structure of the conveyor wheel assembly with the part of the roller bed removed as shown in Figure 1.

[0018] Figure 3 is a three-dimensional structural diagram of a conveying system provided in one embodiment of this specification.

[0019] Figure 4 is a structural schematic diagram of the conveying system shown in Figure 3 from another perspective.

[0020] Figure 5 is a magnified view of part A in Figure 4.

[0021] Structural designation explanation

[0022] 100 Roller bed; 110 Conveyor frame; 111 First station; 120 Sub-conveyor wheel set; 121 Rigid conveyor positioning wheel; 122 Rubber-coated conveyor wheel; 1221 Wheel hub; 1222 Rubber-coated ring; 130 Height limiting structure; 200 Carrier; 210 Limiting block. Detailed Implementation

[0023] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0024] In this application specification, the drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features.

[0025] Unless otherwise stated, all technical and scientific terms used in this application specification have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this specification. The term "and / or" as used in this application specification includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0026] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.

[0028] In the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] In the description of this application, unless otherwise expressly defined, the terms "above," "over," "on top of," "below," "below," "under," or "below" can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "below," and "over" can mean that the first feature is directly above or diagonally above the second feature, or simply that the horizontal level of the first feature is higher than the horizontal level of the second feature. Similarly, "below," "below," and "below" can mean that the first feature is directly below or diagonally below the second feature, or simply that the horizontal level of the first feature is lower than the horizontal level of the second feature.

[0030] Currently, in automobile manufacturing workshops, conveying systems typically include carriers (such as skids) for loading vehicle parts and roller beds for transporting the carriers. Along the conveying direction of the roller beds, the carriers can move vehicle parts between different pre-set processing stations on the roller beds under the action of driving force. Typically, the processing stations on the roller beds are arranged according to the automobile manufacturing process.

[0031] In related technologies, multiple rollers are installed on the conveyor support or conveyor track of a roller bed along the conveying direction of the roller bed. These rollers can abut against the carrier, thereby driving the carrier to move or providing support for the carrier. To increase the friction between the rollers and the carrier to prevent the carrier from slipping, and also to absorb vibration to protect the vehicle parts loaded on the carrier, the structure of these rollers typically includes a hub and an elastic material layer covering the hub, i.e., a rubber-coated conveyor roller.

[0032] The inventors discovered that when the carrier comes into contact with the rubber-coated conveyor wheel, it causes compression of the elastic material layer on the surface of the conveyor wheel, i.e., the rubber coating. Differences in the weight of the vehicle parts loaded on the carrier, differences in the weight of the carrier after replacement, or the increased weight of the carrier and its loaded vehicle parts can all lead to increased compression of the elastic material layer on the surface of the rubber-coated conveyor wheel under prolonged pressure. These factors can result in different vertical positions of the carrier at the same workstation, making accurate positioning impossible and failing to meet the positioning requirements of some workstations with high precision requirements.

[0033] Therefore, it is necessary to provide a roller bed, including a conveyor frame with a first station and a conveyor wheel assembly mounted on the conveyor frame. The conveyor wheel assembly includes a rigid conveyor positioning wheel and a rubber-coated conveyor wheel located at the first station. The rubber-coated conveyor wheel includes a hub. The outer diameter of the rigid conveyor positioning wheel is larger than the outer diameter of the hub but smaller than the outer diameter of the rubber-coated conveyor wheel. Furthermore, since the rigid conveyor positioning wheel is not prone to elastic deformation under significant resistance, when the carrier moves to the first station, it stops moving downwards after contacting the rigid conveyor positioning wheel under gravity. This allows the rigid conveyor positioning wheel to provide vertical support and positioning for the carrier, achieving accurate vertical positioning and improving the positioning accuracy of the carrier.

[0034] Referring to Figures 1 and 2, a roller bed 100 is provided in one embodiment of this specification. The roller bed 100 includes a conveyor frame 110 and a set of conveyor wheels disposed on the conveyor frame 110.

[0035] The conveyor frame 110 is used to carry a carrier, which can move along the conveying direction of the roller bed 100. Specifically, the conveyor frame 110 can extend along the conveying direction of the roller bed 100 and has multiple processing stations arranged in the layout of the entire production line, corresponding to other processing equipment. These processing stations may include a first station 111 with high positioning accuracy requirements. Taking the roller bed 100 as an example of being applied to an automotive welding production line, the first station 111 on the conveyor frame 110 may include processing stations such as the main body assembly station and the welding robot workstation. It is understood that in other feasible embodiments, the roller bed is not limited to including the first station, but may also include a second station with lower positioning accuracy requirements. For example, the second station may include processing stations such as the component pre-assembly station and the spot welding or stud welding station.

[0036] It is understood that the conveyor wheel assembly can be used to abut against the vehicle to support and / or drive the vehicle. Specifically, in this embodiment, the conveyor wheel assembly includes a rigid conveyor positioning wheel 121 and a rubber-coated conveyor wheel 122. It is understood that both the rigid conveyor positioning wheel 121 and the rubber-coated conveyor wheel 122 are conveyor wheels.

[0037] The rubber-coated conveyor wheel 122 includes a hub 1221. The outer diameter D2 of the rigid conveyor positioning wheel 121 is greater than the outer diameter D1 of the hub 1221 and smaller than the outer diameter D3 of the rubber-coated conveyor wheel 122, that is, D1 <D2<D3。

[0038] The roller bed 100 described above, because the rigid conveying positioning wheel 121 is not prone to elastic deformation under the action of a large resistance force, when the carrier moves to the first station, the carrier will not move downward after it comes into contact with the rigid conveying positioning wheel 121 under the action of gravity. Thus, the rigid conveying positioning wheel 121 provides vertical support and positioning for the carrier, thereby achieving accurate positioning of the carrier in the vertical direction and improving the positioning accuracy of the carrier.

[0039] In this embodiment, the first station is also provided with a rubber-coated conveyor wheel 122. Through the buffering effect of the surface of the rubber-coated conveyor wheel 122, the carrier can stop more smoothly at the first station 111 or pass through the first station 111, thereby reducing the swaying of the carrier in the vertical direction and realizing the positioning of the carrier in the vertical direction.

[0040] Furthermore, by having the rigid conveying positioning wheel 121 and the rubber-coated conveying wheel 122 jointly support the carrier, the supporting force of each wheel can be reduced, and the phenomenon of local stress concentration in the carrier can also be reduced.

[0041] In addition, even at the first workstation where the working hours are long, it is important to avoid prolonged pressure between the carrier and the rubber-coated conveyor wheel, which could cause significant deformation of the rubber-coated ring of the conveyor wheel and thus avoid the risk of inelastic deformation of the rubber-coated ring.

[0042] In some embodiments, the conveyor wheel assembly includes a second station. Therefore, the conveyor wheel assembly for the second station may consist only of the rubber-coated conveyor wheel 122, without the rigid conveyor positioning wheel.

[0043] In some embodiments, the outer diameter D2 of the rigid conveyor positioning wheel 121 can be 0.3mm to 0.5mm smaller than the outer diameter D3 of the rubber-coated conveyor wheel 122. Optionally, the outer diameter D2 of the rigid conveyor positioning wheel 121 can be 0.3mm, 0.35mm, 0.4mm, 0.45mm, or 0.5mm smaller than the outer diameter D3 of the rubber-coated conveyor wheel 122. Therefore, while vertical positioning is achieved using the rigid conveyor positioning wheel 121, the risk of inelastic deformation of the rubber-coated conveyor wheel 122 can be better avoided.

[0044] Specifically, the center of the rigid conveyor positioning wheel 121 and the center of the rubber-coated conveyor wheel 122 are on the same horizontal line.

[0045] In this embodiment, the conveyor wheel assembly may include two rows of sub-conveyor wheel assemblies 120. Specifically, each row of sub-conveyor wheel assemblies 120 may include rigid conveyor positioning wheels 121 and rubber-coated conveyor wheels 122 arranged along the conveying direction. Referring to Figure 1, the sub-conveyor wheel assembly 120 refers to the multiple conveyor wheels within the dashed box. The arrangement of the rigid conveyor positioning wheels 121 and rubber-coated conveyor wheels 122 along the conveying direction means that the multiple conveyor wheels composed of the rigid conveyor positioning wheels 121 and rubber-coated conveyor wheels 122 are arranged along the conveying direction. The sub-conveyor wheel assembly 120 is configured in two rows, which can more stably support the carrier and prevent the carrier from tilting.

[0046] In this embodiment, the arrangement direction of the two rows of conveyor wheel sets 120 is perpendicular to both the conveying direction and the vertical direction. For ease of description, the arrangement direction of the two rows of conveyor wheel sets 120 is referred to as the transverse direction. It can be understood that the transverse arrangement of the two rows of conveyor wheel sets 120 ensures that the carrier remains stable when moving on the first station 111 of the roller bed 100.

[0047] In this embodiment, in the two rows of sub-conveying wheel sets 120, the rigid conveying positioning wheel 121 or the rubber-coated conveying wheel 122 in one row of conveying wheel sets 120 are respectively set with one rigid conveying positioning wheel 121 or the rubber-coated conveying wheel 122 in the other row of conveying wheel sets 120, and the corresponding conveying wheels are arranged in a transverse direction.

[0048] In this embodiment, the spacing between adjacent conveyor wheels in the same row of conveyor wheel sets 120 is the same. In another feasible embodiment, the spacing between adjacent conveyor wheels in the same row of conveyor wheel sets may also be different.

[0049] Optionally, the conveyor frame 110 may include two conveyor tracks, and the multiple conveyor wheels included in the two rows of sub-conveyor wheel sets 120 may be symmetrically and evenly installed on the two conveyor tracks.

[0050] To achieve vertical positioning of the carrier using the rigid conveyor positioning wheel 121 while reducing the carrier's sliding in non-conveying directions, in some embodiments, the conveyor frame 110 may have a conveying direction; along the conveying direction, rubber-coated conveyor wheels 122 may be provided on both sides of the rigid conveyor positioning wheel 121 located at each first station 111. Specifically, there may be a large frictional force between the carrier and the rubber-coated conveyor wheels 122, thereby preventing the carrier from sliding in non-conveying directions.

[0051] Specifically, among the multiple conveyor wheels provided on each first workstation 111, rigid conveyor positioning wheels 121 and rubber-coated conveyor wheels 122 can be arranged alternately, such that the adjacent conveyor wheels of each rigid conveyor positioning wheel 121 are rubber-coated conveyor wheels 122. In some embodiments, multiple rubber-coated conveyor wheels 122 can also be provided between two rigid conveyor positioning wheels 121.

[0052] In some embodiments, the rigid conveyor positioning wheel 121 can be a metal wheel. Specifically, the rigid conveyor positioning wheel 121 can be a conveyor wheel made of materials such as alloy steel, hard alloy, stainless steel, or powder metallurgy materials. In some working conditions with special requirements for the performance of the conveyor wheel or the processing environment, the rigid conveyor positioning wheel 121 can also be a conveyor wheel made of metal ceramic or carbon fiber composite materials.

[0053] Optionally, in some embodiments, the rubber-coated conveyor wheel 122 includes a rubber-coated ring 1222 sleeved on the hub 1221. The rubber-coated ring 1222 can be a polyurethane ring, a rubber ring, or an epoxy resin ring to meet the processing environment requirements of automobile production lines, such as high-speed operation, heavy load, and low noise.

[0054] During the process of the rubber-coated ring 1222 of the rubber-coated conveyor roller 122 returning from a compressed state to a normal state, a large vertical supporting force may be provided to the carrier. This causes vertical movement of the vehicle parts carried by the carrier as it moves on the roller bed 100, potentially leading to lower positioning accuracy and reduced machining precision of the vehicle parts. To limit the range of vertical movement of the carrier and improve its vertical positioning accuracy, in some embodiments, the roller bed 100 may also include a height limiting structure 130. Specifically, this height limiting structure 130 can be used to limit the vertical height of the carrier that can be mounted on the roller bed 100.

[0055] It is understood that the height limiting structure 130 is designed to match a pre-set carrier. It is also understood that in some feasible embodiments, the limiting height of the height limiting structure 130 is adjustable to match a wider range of carriers of different sizes, thereby increasing the applicability of the roller bed.

[0056] Referring to Figures 3 to 5, one embodiment of this specification provides a conveying system that may include a roller bed 100 as described in the above embodiments and a carrier 200 disposed on the roller bed 100. Specifically, the roller bed 100 may be used to convey the carrier 200. The carrier 200 may be used to load vehicle parts. The carrier 200 may have a structure that cooperates with the conveyor frame 110 of the roller bed 100, such that the carrier 200 can be disposed on the roller bed 100 during the loading of vehicle parts and the movement of the vehicle parts to various processing stations. In some embodiments, the conveying system may further include a spare carrier 200 to replace the faulty carrier 200 when the carrier 200 moving on the roller bed 100 fails, thereby reducing the downtime caused by the failure of the carrier 200 and improving the overall conveying efficiency of the conveying system.

[0057] The conveying system provided in this specification includes a roller bed 100. Referring to Figures 1 and 2, a conveying wheel assembly including a rigid conveying positioning wheel 121 and a rubber-coated conveying wheel 122 is provided on the conveying frame 110 of the roller bed 100. The rubber-coated conveying wheel 122 includes a hub 1221. The outer diameter of the rigid conveying positioning wheel 121 is larger than the outer diameter of the hub 1221 and smaller than the outer diameter of the rubber-coated conveying wheel 122. Since the rigid conveying positioning wheel 121 is not prone to elastic deformation under the pressure of the carrier, when the carrier moves to the first station, the carrier will not move downward after contacting the rigid conveying positioning wheel under the action of gravity. Thus, the rigid conveying positioning wheel provides vertical support and positioning for the carrier, improving the positioning accuracy of the carrier.

[0058] To reduce the obstruction encountered by the carrier 200 during its movement on the roller bed 100, and to facilitate the passage of the carrier 200 through the location of the height limiting structure 130, thereby improving the overall conveying efficiency of the conveying system, in some embodiments, a reserved gap H may be provided between the height limiting structure 130 and the carrier 200.

[0059] Specifically, a limiting block 210 can be provided on the carrier 200. The position of the limiting block 210 on the carrier 200 can correspond to the height limiting structure 130. That is, when the carrier 200 passes through the height limiting structure 130, the height limiting structure 130 and the limiting block 210 are positioned vertically, with the limiting block 210 located on the bottom side of the height limiting structure 130. See Figure 5 for the relevant information. The reserved gap H can be the distance between the surface of the height limiting structure 130 near the conveyor frame 110 and the surface of the limiting block 210 away from the conveyor frame 110.

[0060] Specifically, the size of the reserved gap H falls within the range of 0.1mm to 0.2mm. Optionally, the size of the reserved gap H can be 0.1mm, 0.12mm, 0.15mm, 0.17mm, or 0.2mm.

[0061] In some embodiments, the conveying system may further include a drive mechanism. Specifically, in this embodiment, the conveyor wheel set provides both support and driving force to the carrier 200. The drive mechanism can be used to provide power to the conveyor wheel set to drive the conveyor wheels to rotate, thereby moving the carrier 200 along the conveying direction. Of course, in other feasible embodiments, the conveyor wheel set may only provide support to the carrier 200, and the drive mechanism may provide power to the carrier 200 along the conveying direction through other structures to drive the carrier 200 carrying vehicle parts to move on the roller bed 100. For example, a linear motor may be used as the drive mechanism to drive a drive member with magnetic elements to move along the conveying direction, thereby driving the carrier to move along the conveying direction.

[0062] One embodiment of this specification provides a production line that may include a roller bed as described in the above embodiments or a conveying system as described in the above embodiments.

[0063] Understandably, a production line can also include feeding equipment, unloading equipment, monitoring equipment, welding equipment, etc., which can be set up according to specific needs.

[0064] The technical effects of the production line described in the above embodiments can be explained by referring to other embodiments in this specification, and will not be repeated here.

[0065] It is understood that in the various embodiments of this specification, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not limit the implementation process of the embodiments of this specification in any way.

[0066] It is understood that the various embodiments described in this specification can be implemented individually or in combination, and the embodiments in this specification are not limited in this respect.

[0067] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0068] The above description is merely a specific embodiment of this specification, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this specification should be included within the scope of protection of this specification. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A roller bed, characterized in that, The roller bed includes: a conveyor frame with a first station on the conveyor frame; a conveyor wheel assembly; the conveyor wheel assembly is disposed on the conveyor frame; wherein the conveyor wheel assembly includes a rigid conveyor positioning wheel and a rubber-coated conveyor wheel disposed on the first station; the rubber-coated conveyor wheel includes a hub; the outer diameter of the rigid conveyor positioning wheel is larger than the outer diameter of the hub and smaller than the outer diameter of the rubber-coated conveyor wheel.

2. The roller bed according to claim 1, characterized in that, The outer diameter of the rigid conveyor positioning wheel is 0.3mm to 0.5mm smaller than that of the rubber-coated conveyor wheel.

3. The roller bed according to claim 1 or 2, characterized in that, The conveyor wheel set includes at least two rows of sub-conveyor wheel sets; each row of the sub-conveyor wheel set includes the rigid conveyor positioning wheel and the rubber-coated conveyor wheel arranged along the conveying direction.

4. The roller bed according to any one of claims 1 or 2, characterized in that, The conveyor frame has a conveying direction; along the conveying direction, at each of the first workstations, the rubber-coated conveyor wheels are provided on both sides of the rigid conveying positioning wheel.

5. The roller bed according to any one of claims 1 or 2, characterized in that, The rigid conveying and positioning wheel is a metal wheel, a metal-ceramic wheel, or a carbon fiber composite wheel.

6. The roller bed according to claim 1 or 2, characterized in that, The rubber-coated conveyor wheel includes a rubber-coated ring fitted on the hub, wherein the rubber-coated ring is a polyurethane ring, a rubber ring, or an epoxy resin ring.

7. The roller bed according to claim 1 or 2, characterized in that, The roller bed further includes a height limiting structure, which is used to limit the height of a carrier that can be mounted on the roller bed in the vertical direction.

8. A conveying system, characterized in that, The conveying system includes a roller bed as described in any one of claims 1 to 7 and a carrier that can be disposed on the roller bed.

9. The conveying system according to claim 8, characterized in that, The height-limiting structure and the vehicle have a reserved gap in the vertical direction, the size of which falls within the range of 0.1mm to 0.2mm.

10. A production line, characterized in that, The production line includes a roller bed as described in any one of claims 1 to 6 or a conveying system as described in any one of claims 7 to 9.

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