A transmission device and a detection apparatus

Abstract

This application relates to the field of sheet metal transportation technology, disclosing a transmission device and a detection equipment. The transmission device includes a fixed transmission module and a movable transmission module. The fixed transmission module includes a support plate, a drive motor, a conveyor belt, and at least two pulleys. The drive motor is mounted on the support plate, and the two pulleys are rotatably mounted on the support plate, with the two pulleys located at opposite ends of the support plate. The conveyor belt is sleeved on the two pulleys, and the drive motor is connected to the conveyor belt. The movable transmission module includes a movable plate and a bearing follower. The movable plate is mounted on the support plate, and the bearing follower is rotatably mounted on the movable plate. The bearing follower is configured to abut against the surface of the sheet metal being transported that is away from the conveyor belt. Through the above method, this application embodiment can increase the friction between the sheet metal and the conveyor belt, which is beneficial to improving the stability of sheet metal transportation. At the same time, the bearing follower can flatten the edges of the sheet metal, which is beneficial to improving the stability of detection.

Description

Technical Field

[0001] This application relates to the field of sheet metal transportation technology, and in particular to a transmission device and a testing equipment. Background Technology

[0002] In the circuit board manufacturing process, board material transport structures are typically used to move the circuit board materials. Currently, the two most common board material transport structures are conveyor belt transport and gripper transport. Existing conveyor belt transport structures are more suitable for transporting boards with a certain degree of rigidity. By placing the board material on the conveyor belt, the rotation of the conveyor belt moves the board material, resulting in relatively stable transport. However, for flexible boards, slippage can easily occur, leading to unstable transport. Gripper transport is suitable for shorter flexible boards. For longer flexible boards, the friction between the grippers and the product is insufficient to move the entire product, eventually causing the product to detach from the grippers and fail to be transported. Therefore, improving the stability of flexible board transport has become a pressing issue for the industry. Summary of the Invention

[0003] This application provides a transmission device and a testing equipment that can improve the stability of sheet material transportation, especially for the transmission of flexible and long sheets. It can effectively reduce the risk of sheet material slippage and improve the stability of transmission, while also helping to improve the accuracy of testing.

[0004] To address the aforementioned technical problems, one technical solution adopted in this application is to provide a transmission device comprising a fixed transmission module and a movable transmission module. The fixed transmission module includes a support plate, a drive motor, a conveyor belt, and at least two pulleys. The drive motor is mounted on the support plate, and the two pulleys are rotatably mounted on the support plate, with the two pulleys located at opposite ends of the support plate. The conveyor belt is fitted over the two pulleys, and the drive motor is connected to the conveyor belt. The movable transmission module includes a movable plate and a bearing follower. The movable plate is mounted on the support plate, and the bearing follower is rotatably mounted on the movable plate. The bearing follower is configured to abut against the surface of the receiving sheet material away from the conveyor belt. By setting the bearing follower to abut against the sheet material, the friction between the sheet material and the conveyor belt is increased, which helps to improve the stability of the sheet material transportation.

[0005] In some embodiments, the support plate includes a first transmission section and a detection section, with a movable plate disposed in the detection section. The first transmission section and the detection section are arranged along a first direction, which is parallel to the transmission direction of the conveyor belt. The fixed transmission module also includes a first bearing, which is rotatably disposed in the first transmission section. The first bearing is configured to abut against the surface of the receiving sheet material away from the conveyor belt, and the diameter of the first bearing is larger than the diameter of the bearing follower. By providing a first bearing with a diameter larger than that of the bearing follower, the first bearing can flatten the raised portion at the front end of the sheet material, reducing the risk that the sheet material cannot enter the position between the bearing follower and the conveyor belt, and improving the smoothness of sheet material transmission.

[0006] In some embodiments, the fixed transmission module further includes a second bearing rotatably disposed on the first transmission section. The diameter of the second bearing is larger than that of the first bearing, and in a first direction, the first bearing is closer to the detection section than the second bearing. The second bearing is configured to abut against the surface of the receiving sheet material away from the conveyor belt. By providing a second bearing with a larger diameter than the first bearing, the second bearing can initially flatten the raised portion at the front end of the sheet material, reducing the risk that the sheet material cannot enter the position between the first bearing and the conveyor belt, and facilitating the gradual flattening and smooth transmission of the sheet material.

[0007] In some embodiments, the support plate further includes a second transmission section located on the side of the detection section opposite to the first transmission section. The fixed transmission module also includes a third bearing rotatably disposed on the second transmission section. The third bearing is configured to abut against the surface of the receiving sheet material opposite to the conveyor belt, wherein the diameter of the third bearing is larger than the diameter of the bearing follower. By setting up the second transmission section, the sheet material can enter the detection section from either the first transmission section or the second transmission section, achieving bidirectional transmission and improving the flexibility and production efficiency of the equipment. By setting up the third bearing, whose diameter is larger than the diameter of the bearing follower, the third bearing can flatten the raised portion of the front end of the sheet material entering from the second transmission section, reducing the risk that the sheet material cannot enter the position between the bearing follower and the conveyor belt.

[0008] In some embodiments, the fixed transmission module further includes a fourth bearing rotatably disposed in the second transmission section. The diameter of the fourth bearing is larger than that of the third bearing, and in a first direction, the third bearing is closer to the detection section than the fourth bearing. The fourth bearing is configured to abut against the surface of the receiving sheet material away from the conveyor belt. By configuring the fourth bearing, whose diameter is larger than that of the third bearing, the fourth bearing can initially flatten the raised portion of the front end of the sheet material entering from the second transmission section, reducing the risk that the sheet material cannot enter the position between the third bearing and the conveyor belt, and facilitating the gradual flattening and smooth transmission of the sheet material from the second transmission section.

[0009] In some embodiments, there are two fixed transmission modules and two movable transmission modules. The two fixed transmission modules are spaced apart, and the conveyor belts of the two fixed transmission modules share the function of carrying and conveying the sheet metal to be transferred. One movable transmission module is mounted on the support plate of one fixed transmission module, and the bearing followers of the two movable transmission modules are respectively used to abut against the surfaces of the sheet metal to be transferred that are away from the conveyor belt. By setting two fixed transmission modules and two movable transmission modules, pressure and driving force can be applied simultaneously from both sides of the sheet metal, which helps to improve the stability of sheet metal transfer and reduce the risk of sheet metal deviation or rotation. Especially for wide sheet metal, the two-sided driving method can better control the movement trajectory of the sheet metal.

[0010] In some embodiments, the conveying device includes a suction module, which includes a flat plate and a cylinder. The flat plate is located between support plates of two fixed conveying modules. The cylinder is connected to the flat plate and drives the flat plate to move along a second direction, which is perpendicular to the flat plate and the conveying direction of the conveyor belt. By driving the flat plate to move along the second direction, the flat plate can lift the sheet material located in the detection section, reducing the risk of the middle part of the sheet material being suspended in the air, which helps to reduce deformation of the middle part of the sheet material and improve the accuracy of detection.

[0011] In some embodiments, the suction module includes a suction cup and an air extraction assembly. The air extraction assembly is connected to the suction cup, and the suction cup is disposed on a first surface of the flat plate. The first surface is configured to carry the sheet material to be transferred. By disposing of the suction cup on the first surface of the flat plate and removing the air between the suction cup and the sheet material using the air extraction assembly, the sheet material can be adsorbed and fixed by the suction cup, which helps to improve the flatness of the sheet material and further improves the accuracy of the inspection.

[0012] In some embodiments, a check valve is provided between the suction cup and the air extraction assembly. The check valve is used to prevent air leakage during the suction process, which helps to maintain a stable negative pressure environment and improve the suction effect and stability of the suction cup on the sheet material.

[0013] In some embodiments, the conveying device further includes a conversion plate, and a cylinder is disposed on the conversion plate. The suction module includes a guide shaft and a limiting ring. The guide shaft passes through the conversion plate and is slidable relative to the conversion plate. One end of the guide shaft is disposed on a flat plate. The limiting ring is disposed on the guide shaft and is located on the side of the conversion plate opposite to the flat plate. The guide shaft can guide the movement direction of the flat plate and limit the flat plate from deflection or rotation during movement, which helps to improve the stability of the flat plate's movement. The limiting ring can limit the highest position of the flat plate, preventing the flat plate from rising too high and causing damage to the cylinder or affecting the normal operation of the equipment. At the same time, the polyurethane coating on the limiting ring can reduce the impact when the flat plate reaches its final position, which helps to extend the service life of the equipment.

[0014] In some embodiments, the material suction module further includes a linear bearing disposed on the conversion plate, with the guide shaft passing through the linear bearing. By providing the linear bearing, a sliding connection is achieved between the guide shaft and the conversion plate. The linear bearing can reduce the friction between the guide shaft and the conversion plate, which is beneficial to improving the smoothness of the flat plate's movement. At the same time, the linear bearing can provide better guiding accuracy, which is beneficial to improving the movement accuracy of the flat plate.

[0015] In some embodiments, the transmission device further includes a support plate located between the support plates of the two fixed transmission modules, and along a first direction, the support plate is located in the first transmission section of the support plate. By setting the support plate in the first transmission section, the support plate is used to support the sheet material, which can provide additional support for the sheet material, reduce the risk of the sheet material sagging or deforming in the first transmission section, and help improve the stability of the sheet material transmission.

[0016] In some embodiments, in the first direction, a guide ramp is provided at one end of the support plate away from the detection section. The guide ramp is configured to guide the sheet material to be transferred into the first transfer section. If the front end of the sheet material bends downward, it will be difficult for the sheet material to enter the position between the second bearing and the conveyor belt. By providing the guide ramp, which guides the sheet material with its front end bent downward into the position between the second bearing and the conveyor belt, the risk of the sheet material being unable to enter the transfer section due to its front end bending downward is reduced, which helps to improve the smoothness of sheet material feeding.

[0017] In some embodiments, the movable transmission module further includes a drive component, a guide rail, and a slider. The guide rail is disposed on a support plate, the slider is slidably disposed on the guide rail, the movable plate is disposed on the slider, and the drive component is disposed on the support plate. The drive component is connected to the movable plate and configured to drive the movable plate to slide along the guide rail. By driving the movable plate to move, the distance between the bearing follower mounted on the movable plate and the conveyor belt can be adjusted according to the thickness of the sheet material. This improves the adaptability of the transmission device to sheet materials of different thicknesses. When the sheet material is thick, the distance between the bearing follower and the conveyor belt can be increased to avoid excessive pressure on the sheet material. When the sheet material is thin, the distance between the bearing follower and the conveyor belt can be decreased to increase the friction between the sheet material and the conveyor belt, which helps to improve the stability of the transmission.

[0018] To address the aforementioned technical problems, another technical solution adopted in this application embodiment is to provide a testing device including the aforementioned transmission device. By integrating the transmission device, the testing device can achieve stable transmission and flatness detection of the sheet material during optical inspection, thereby improving the accuracy and efficiency of the inspection.

[0019] The beneficial effects of this application's embodiments are as follows: Unlike the prior art, in this application's embodiments, a drive motor drives the conveyor belt to move. The conveyor belt is used to carry and transport sheet metal. By setting a movable transmission module, a bearing follower is rotatably mounted on a movable plate. The bearing follower is used to abut against the surface of the sheet metal being transported away from the conveyor belt, thereby increasing the friction between the sheet metal and the conveyor belt. This helps improve the stability of sheet metal transportation and reduces the risk of sheet metal slippage. Simultaneously, the bearing follower can flatten the edges of the sheet metal, which helps improve the stability and accuracy of sheet metal inspection. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of the transmission device provided in the embodiments of this application;

[0022] Figure 2 This is an exploded view of the transmission device provided in the embodiments of this application;

[0023] Figure 3 yes Figure 1 An enlarged view of the area shown in section A;

[0024] Figure 4 yes Figure 1 An enlarged view of the area shown in section B;

[0025] Figure 5 This is a schematic diagram of the material suction module provided in the embodiments of this application;

[0026] Figure 6 This is a schematic diagram of the material suction module provided in the embodiments of this application;

[0027] Figure 7 This is a schematic diagram showing the connection relationship between the air extraction assembly, check valve, and suction cup provided in the embodiments of this application.

[0028] Attached icon number

[0029] 100. Transmission device;

[0030] 1. Fixed transmission module; 11. Support plate; 111. First transmission section; 112. Detection section; 113. Second transmission section; 12. Drive motor; 121. Drive pulley; 13. Conveyor belt; 14. Pulley; 15. First bearing; 16. Second bearing; 17. Third bearing; 18. Fourth bearing;

[0031] 2. Movable transmission module; 21. Movable plate; 22. Bearing follower; 23. Drive component; 24. Guide rail; 25. Slider;

[0032] 3. Suction module; 31. Flat plate; 311. First surface; 312. Circular hole; 32. Cylinder; 33. Suction cup; 34. Air extraction assembly; 35. Check valve; 36. Guide shaft; 37. Limiting ring; 38. Linear bearing;

[0033] 4. Conversion board;

[0034] 5. Bearing plate; 51. Guide slope;

[0035] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0036] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0038] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0039] In the circuit board manufacturing process, board material transport structures are typically used to move the board materials. Currently, the two most common board material transport structures are conveyor belt transport and gripper transport. Existing conveyor belt transport structures are more suitable for transporting boards with a certain degree of rigidity. By placing the board material on the conveyor belt, the rotation of the belt drives the board material's movement, resulting in relatively stable transport. However, for flexible boards, slippage can easily occur, leading to unstable transport. Gripper transport is suitable for shorter flexible boards, transporting them by gripping the edges of the board material. However, for longer flexible boards, the friction between the grippers and the product may be insufficient to move the entire product, eventually causing the product to detach from the grippers and fail to be transported. For boards with high rigidity, slight rotation during transport can cause the product to jam against the sides of the track, resulting in transport interruption. Furthermore, in automated optical inspection (AOI) equipment, the board material needs to be kept flat during inspection. If the board material is warped or deformed in the inspection section, it will affect the accuracy of the inspection. Therefore, how to improve the transmission stability of sheet metal, especially soft and long sheets, and how to maintain the flatness of sheet metal during the testing process have become urgent problems to be solved in the industry.

[0040] Please see Figure 1 and Figure 2 This application provides a transmission device 100, including a fixed transmission module 1 and a movable transmission module 2. The fixed transmission module 1 includes a support plate 11, a drive motor 12, a conveyor belt 13, and at least two pulleys 14. The support plate 11 is plate-shaped. The drive motor 12 can be a servo motor or a stepper motor. The drive motor 12 is mounted on the support plate 11 and provides power to drive the conveyor belt 13. The conveyor belt 13 can be a rubber conveyor belt or a polyurethane conveyor belt. At least two pulleys 14 are rotatably mounted on the support plate 11. The pulleys 14 are cylindrical and have a shaft hole at their center. The pulleys 14 are rotatably connected to the support plate 11 via bearings. The two pulleys 14 are located at opposite ends of the support plate 11. The conveyor belt 13 is fitted onto the two pulleys 14. The drive motor 12 is connected to the conveyor belt 13 via a drive pulley 121, thereby driving the conveyor belt 13 to move. The movable transfer module 2 includes a movable plate 21 and a bearing follower 22. The movable plate 21 is plate-shaped and is mounted on the support plate 11. The movable plate 21 can move relative to the support plate 11. The bearing follower 22 includes an outer ring (not labeled) and an inner ring (not labeled). The outer ring can rotate relative to the inner ring. The bearing follower 22 is mounted on the movable plate 21 via the rotation of the inner ring. The outer ring is used to abut against the plate material (not shown). The bearing follower 22 is configured to abut against the surface of the plate material to be transferred away from the conveyor belt 13. The plate material is usually the substrate of a circuit board, which can be a rigid board or a flexible board (i.e., a soft board).

[0041] In this embodiment, the conveyor belt 13 is driven by the drive motor 12 to move. The conveyor belt 13 carries the sheet material (e.g., rigid or flexible board), and the sheet material is transported via the conveyor belt 13. By setting up the movable transmission module 2, the bearing follower 22 is rotatably mounted on the movable plate 21. The bearing follower 22 is used to abut the surface of the sheet material to be transported away from the conveyor belt 13, so that the sheet material is clamped between the conveyor belt 13 and the bearing follower 22, thereby increasing the friction between the sheet material and the conveyor belt 13, which helps to improve the stability of the sheet material transportation and reduce the risk of slippage of flexible boards. At the same time, the bearing follower 22 can apply a certain pressure to the sheet material, flattening the edges of the sheet material, which helps to improve the stability of the inspection when the sheet material is inspected. The outer ring of the bearing follower 22 can rotate with the movement of the sheet material, reducing the frictional resistance between the bearing follower 22 and the sheet material, which helps to reduce the wear on the surface of the sheet material.

[0042] In some embodiments, there are multiple bearing followers 22, which are spaced apart along a first direction X, parallel to the transmission direction of the conveyor belt 13. By setting multiple bearing followers 22 spaced apart along the first direction X, pressure can be applied to multiple positions of the sheet material, which helps to improve the flattening effect of the sheet material in the transmission direction, reduces the risk of local warping of the sheet material during transmission, and further improves the stability of transmission.

[0043] It is worth noting that for soft sheet metal, if the height of the front end of the sheet metal is too high when it is received, exceeding the radius of the bearing follower 22, the sheet metal will have difficulty entering the position between the bearing follower 22 and the conveyor belt 13, resulting in the sheet metal being unable to smoothly enter the detection section for transmission and detection.

[0044] To at least partially address the above problems, in some embodiments, please continue to refer to... Figure 1 and Figure 2 The support plate 11 includes a first transmission section 111 and a detection section 112. The first transmission section 111 and the detection section 112 are different regions of the support plate 11 in the first direction X. The first transmission section 111 is located upstream of the detection section 112 and is used to receive the sheet material to be transmitted and transmit it to the detection section 112. The detection section 112 is used to inspect the sheet material, for example, by inspecting the surface of the sheet material using an optical inspection device. A movable plate 21 is disposed in the detection section 112, and the first transmission section 111 and the detection section 112 are arranged along the first direction X. Please refer to... Figure 3The fixed transmission module 1 also includes a first bearing 15, which has a structure similar to the bearing follower 22, including an outer ring and an inner ring. The outer ring can rotate relative to the inner ring. The first bearing 15 is rotatably mounted on the first transmission section 111 via the inner ring. The first bearing 15 is configured to abut against the surface of the receiving sheet material away from the conveyor belt 13. The diameter of the first bearing 15 is larger than the diameter of the bearing follower 22; for example, the diameter of the first bearing 15 can be 1.2 to 2 times the diameter of the bearing follower 22.

[0045] In this embodiment, the sheet metal first enters the first conveyor section 111. The first bearing 15 applies pressure to the sheet metal. Since the diameter of the first bearing 15 is larger than the diameter of the bearing follower 22, the space between the first bearing 15 and the conveyor belt 13 for the sheet metal to enter is larger. Even if the front end of the sheet metal has a certain tilt, it can still smoothly enter the position between the first bearing 15 and the conveyor belt 13. The first bearing 15 can flatten the tilted part of the front end of the sheet metal, reducing the tilt height of the front end of the sheet metal. This allows the sheet metal to smoothly enter the position between the bearing follower 22 and the conveyor belt 13 after entering the detection section 112, reducing the risk that the sheet metal cannot enter the position between the bearing follower 22 and the conveyor belt 13, and improving the smoothness of sheet metal transmission. When the sheet metal is transported to the detection section 112, detection equipment (not shown) can be used to detect the sheet metal, such as using optical detection equipment to detect defects, patterns, or markings on the surface of the sheet metal.

[0046] In some embodiments, there are multiple first bearings 15, which are distributed at intervals along a first direction X. By setting multiple first bearings 15 at intervals along the first direction X, pressure can be applied to multiple positions of the sheet metal in the first transmission section 111, which helps to improve the flattening effect of the sheet metal and reduce the risk of local warping of the sheet metal before entering the detection section 112.

[0047] It is worth noting that although the first bearing 15 can initially flatten the raised part at the front end of the sheet, if the raised height of the sheet is large, the first bearing 15 alone may not be able to completely flatten the sheet, making it difficult for the sheet to smoothly enter the detection section 112.

[0048] To at least partially address the above problems, in some embodiments, please continue to refer to... Figure 1 and Figure 3The fixed transmission module 1 also includes a second bearing 16, which has a similar structure to the first bearing 15, including an outer ring and an inner ring. The outer ring can rotate relative to the inner ring. The second bearing 16 is rotatably mounted on the first transmission section 111 via the inner ring. The diameter of the second bearing 16 is larger than that of the first bearing 15; for example, the diameter of the second bearing 16 can be 1.2 to 2 times the diameter of the first bearing 15. Furthermore, in the first direction X, the first bearing 15 is closer to the detection section 112 than the second bearing 16. In the first direction X, the second bearing 16 is located upstream of the first bearing 15, meaning the sheet metal first passes the second bearing 16, then the first bearing 15, and finally enters the detection section 112. The second bearing 16 is configured to abut against the surface of the received sheet metal away from the conveyor belt 13. In this embodiment, the sheet metal first enters the position between the second bearing 16 and the conveyor belt 13. The second bearing 16 has the largest diameter, thus creating the largest space for the sheet metal to enter between it and the conveyor belt 13. Even if the front end of the sheet metal has a significant upward tilt, it can still smoothly enter the position between the second bearing 16 and the conveyor belt 13. The second bearing 16 can initially flatten the tilted portion of the sheet metal front end, reducing its tilt height. Then, the sheet metal enters the position between the first bearing 15 and the conveyor belt 13. The diameter of the first bearing 15 is smaller than that of the second bearing 16, allowing it to further flatten the sheet metal. Finally, the sheet metal enters the detection section 112, where the bearing follower 22 has the smallest diameter, providing the final flattening. This step-by-step flattening by the second bearing 16, the first bearing 15, and the bearing follower 22 reduces the risk of the sheet metal failing to enter the detection section 112, facilitating the gradual flattening and smooth transport of the sheet metal.

[0049] In some embodiments, there are multiple second bearings 16, which are distributed at intervals along the first direction X. By setting multiple second bearings 16 at intervals along the first direction X, pressure can be applied to multiple positions of the sheet material during the feeding stage, which helps to improve the initial flattening effect of the front end of the sheet material and reduces the risk that the sheet material cannot enter the first transmission section 111 due to excessive warping.

[0050] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 4The support plate 11 also includes a second transmission section 113, which is another area of ​​the support plate 11 in the first direction X. The second transmission section 113 is located on the side of the detection section 112 opposite to the first transmission section 111. The second transmission section 113 is located downstream of the detection section 112 (relative to the sheet material entering from the first transmission section 111) or upstream of the detection section 112 (relative to the sheet material entering from the second transmission section 113). The fixed transmission module 1 also includes a third bearing 17, which has a similar structure to the first bearing 15, including an outer ring and an inner ring. The outer ring can rotate relative to the inner ring. The third bearing 17 is rotatably mounted on the second transmission section 113 via the inner ring. The third bearing 17 is configured to abut against the surface of the received sheet material opposite to the conveyor belt 13. The diameter of the third bearing 17 is larger than the diameter of the bearing follower 22. For example, the diameter of the third bearing 17 can be the same as or similar to the diameter of the first bearing 15.

[0051] In this embodiment, by setting a second transmission section 113, the sheet metal can enter the detection section 112 from either the first transmission section 111 or the second transmission section 113, achieving bidirectional transmission. When the sheet metal enters the detection section 112 from the second transmission section 113, it first enters the position between the third bearing 17 and the conveyor belt 13. The diameter of the third bearing 17 is larger than the diameter of the bearing follower 22, resulting in a larger gap between the third bearing 17 and the conveyor belt 13. Even if the front end of the sheet metal has a certain tilt, it can still smoothly enter the position between the third bearing 17 and the conveyor belt 13. The third bearing 17 can flatten the tilted part of the front end of the sheet metal, reducing the tilt height and allowing the sheet metal to smoothly enter the position between the bearing follower 22 and the conveyor belt 13 after entering the detection section 112, reducing the risk that the sheet metal cannot enter the position between the bearing follower 22 and the conveyor belt 13. The bidirectional transmission function helps to improve the flexibility of equipment use. For example, it can realize the reciprocating detection of the sheet material, or flexibly select the feeding direction of the sheet material according to the layout of the production line, which helps to improve production efficiency.

[0052] In some embodiments, there are multiple third bearings 17, which are spaced apart along the first direction X. By setting multiple third bearings 17 spaced apart along the first direction X, pressure can be applied to the sheet material entering from the second transmission section 113 at multiple locations, which is beneficial to improving the flattening effect of the sheet material when it enters from the second transmission section 113.

[0053] In some embodiments, the fixed transmission module 1 further includes a fourth bearing 18, which has a similar structure to the second bearing 16, including an outer ring and an inner ring. The outer ring is rotatable relative to the inner ring, and the fourth bearing 18 is rotatably disposed on the second transmission section 113 via the inner ring. The diameter of the fourth bearing 18 is larger than the diameter of the third bearing 17. For example, the diameter of the fourth bearing 18 may be the same as or similar to the diameter of the second bearing 16, and in the first direction X, the third bearing 17 is closer to the detection section 112 than the fourth bearing 18. In the first direction X, the fourth bearing 18 is located upstream of the third bearing 17 (relative to the sheet material entering from the second transmission section 113), that is, when the sheet material enters from the second transmission section 113, the sheet material first passes the fourth bearing 18, then the third bearing 17, and finally enters the detection section 112. The fourth bearing 18 is configured to abut against the surface of the received sheet material away from the conveyor belt 13.

[0054] In this embodiment, when the sheet metal enters from the second conveyor section 113, it first enters the position between the fourth bearing 18 and the conveyor belt 13. The fourth bearing 18 has the largest diameter, thus creating the largest space between it and the conveyor belt 13 for the sheet metal to enter. Even if the front end of the sheet metal has a significant upward tilt, it can still smoothly enter the position between the fourth bearing 18 and the conveyor belt 13. The fourth bearing 18 can initially flatten the tilted portion of the sheet metal front end, reducing its tilt height. Then, the sheet metal enters the position between the third bearing 17 and the conveyor belt 13. The diameter of the third bearing 17 is smaller than that of the fourth bearing 18, allowing it to further flatten the sheet metal. Finally, the sheet metal enters the detection section 112, where the bearing follower 22 performs the final flattening. By gradually flattening the sheet metal through the fourth bearing 18, the third bearing 17, and the bearing follower 22, the risk of the sheet metal failing to enter the detection section 112 when it enters from the second transmission section 113 is reduced. This facilitates the gradual flattening and smooth transmission of the sheet metal from the second transmission section 113, and realizes a gradual flattening structure symmetrical with the first transmission section 111.

[0055] In some embodiments, there are multiple fourth bearings 18, which are distributed at intervals along the first direction X. By setting multiple fourth bearings 18 at intervals along the first direction X, pressure can be applied to multiple positions of the sheet material entering from the second transmission section 113 during the material receiving stage, which is beneficial to improving the initial flattening effect of the front end of the sheet material.

[0056] It is worth noting that for wide sheets, if pressure and driving force are applied only to one side of the sheet, the sheet is prone to shifting or rotating, causing the sheet to deviate from the predetermined transmission path during transmission, affecting the stability of transmission and the accuracy of detection.

[0057] To at least partially address the above problems, in some embodiments, please refer to Figure 1and Figure 2 There are two fixed transmission modules 1 and two movable transmission modules 2. The two fixed transmission modules 1 are spaced apart along a third direction Z, which is perpendicular to the first direction X. The two fixed transmission modules 1 have the same or similar structure, and each fixed transmission module 1 includes components such as a support plate 11, a drive motor 12, and a conveyor belt 13. The two fixed transmission modules 1 are spaced apart, and the conveyor belts 13 of the two fixed transmission modules 1 are located on the same horizontal plane. The conveyor belts 13 of the two fixed transmission modules 1 are used together to carry and transport the sheet material to be transported. A movable transmission module 2 is mounted on a support plate 11 of a fixed transmission module 1. Two movable transmission modules 2 are respectively mounted on the support plates 11 of the two fixed transmission modules 1. Each movable transmission module 2 includes a movable plate 21 and a bearing follower 22. The bearing followers 22 of the two movable transmission modules 2 are located on both sides of the sheet material. The two movable transmission modules 2 are distributed on both sides of the sheet material along the third direction Z. The bearing followers 22 of the two movable transmission modules 2 are respectively used to abut against the surface of the sheet material being transported that is away from the conveyor belt 13, and jointly apply pressure to the sheet material.

[0058] In this embodiment, by setting two fixed transmission modules 1 and two movable transmission modules 2, pressure and driving force can be applied simultaneously from both sides of the sheet material. The conveyor belts 13 of the two fixed transmission modules 1 jointly carry the sheet material, and the two drive motors 12 can synchronously drive the two conveyor belts 13, which helps to improve the uniformity of the driving force. The bearing followers 22 of the two movable transmission modules 2 apply pressure to the sheet material from both sides, which helps to improve the stability of the sheet material transmission and reduce the risk of sheet material deviation or rotation. Especially for wide sheets material, the method of driving from both sides and applying pressure from both sides can better control the movement trajectory of the sheet material, which helps to improve the stability of transmission and the accuracy of detection.

[0059] In some embodiments, two fixed transmission modules 1 and two movable transmission modules 2 are symmetrically arranged. Specifically, the two fixed transmission modules 1 are symmetrically arranged about the center line of the sheet metal, and the two movable transmission modules 2 are also symmetrically arranged about the center line of the sheet metal. This symmetrical arrangement ensures that the forces applied to the sheet metal by the two fixed transmission modules 1 and the two movable transmission modules 2 are symmetrical, which helps reduce the risk of sheet metal shifting or rotating, further improving transmission stability.

[0060] It is worth noting that for flexible sheet materials, if the middle part of the sheet material is suspended during inspection in inspection section 112, it is prone to sagging or deformation, affecting the accuracy of the inspection. Furthermore, there is a gap between the two fixed transmission modules 1. If the sheet material is wide, the middle part of the sheet material will be located in the gap between the two fixed transmission modules 1, lacking support and prone to suspension and deformation.

[0061] To at least partially address the above problems, in some embodiments, please refer to Figure 1 , Figure 2 and Figure 5 The conveying device 100 includes a material suction module 3, which includes a flattening plate 31 and a cylinder 32. The flattening plate 31 is plate-shaped, with its length parallel to the first direction X and its width parallel to the third direction Z. The flattening plate 31 is located in the gap between the support plates 11 of the two fixed conveying modules 1. The first surface 311 (i.e., the upper surface) of the flattening plate 31 is used to support the plate material. The cylinder 32 can be a pneumatic cylinder or a hydraulic cylinder. The cylinder 32 is connected to the flattening plate 31, and its piston rod is connected to the flattening plate 31. The cylinder 32 is used to drive the flattening plate 31 to move along the second direction Y. The second direction Y is perpendicular to the first surface 311 of the flattening plate 31, i.e., the second direction Y is vertical and perpendicular to the conveying direction of the conveyor belt 13. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0062] In this embodiment, when the sheet material is located in the detection section 112, the cylinder 32 drives the flattening plate 31 to move upward along the second direction Y. The flattening plate 31 lifts the sheet material, supporting the middle portion of the sheet material and reducing the risk of the middle portion of the sheet material being suspended in the air. The flattening plate 31 can level the middle portion of the sheet material, which helps to reduce deformation of the middle portion of the sheet material and improve the accuracy of detection. After the detection is completed, the cylinder 32 drives the flattening plate 31 to move downward along the second direction Y. The flattening plate 31 separates from the sheet material, and the sheet material can continue to be conveyed along the conveyor belt 13. The lifting and lowering action of the cylinder 32 can be controlled according to the detection needs, which is conducive to realizing the automation of the detection process.

[0063] It is worth noting that although the flat plate 31 can lift the sheet material, if there is no fixed connection between the sheet material and the flat plate 31, the sheet material may shift or slide during the inspection process, affecting the accuracy of the inspection. In addition, for some inspection equipment, the sheet material needs to maintain an extremely high degree of flatness, and relying solely on the lifting of the flat plate 31 may not meet the requirements.

[0064] To at least partially address the above problems, in some embodiments, please continue to refer to... Figure 2 and Figure 5The material suction module 3 includes a suction cup 33 and a vacuum assembly 34, which is connected to the suction cup 33. The suction cup 33 can be a silicone or rubber suction cup, possessing elastic deformation capability. Multiple suction cups 33 are evenly distributed on the first surface 311 of the flat plate 31, configured to support the sheet material to be transferred. The vacuum assembly 34 can be a vacuum generator or vacuum pump, connected to the suction cup 33 via a pipe. The flat plate 31 has a circular hole, and the suction cup 33 is fixed to the flat plate 31 by a suction cup mounting base. The suction cup 33 passes through the circular hole 312 on the flat plate 31, with its upper surface slightly higher than the first surface 311 of the flat plate 31 by approximately 1 mm, allowing it to adsorb the sheet material.

[0065] In this embodiment, after the flat plate 31 lifts the sheet material, the suction component 34 starts working, removing the air between the suction cup 33 and the sheet material to create negative pressure, allowing the sheet material to be adsorbed and fixed by the suction cup 33. Through the adsorption effect of the suction cup 33, a fixed connection is formed between the sheet material and the flat plate 31, which helps reduce the risk of displacement or slippage of the sheet material during the testing process. The suction cup 33 is disposed on the first surface 311 of the flat plate 31, with its upper surface slightly higher than the first surface 311. When the sheet material is placed on the flat plate 31, due to the elasticity of the suction cup 33, it is compressed, allowing the sheet material to effectively adhere to the first surface 311 of the flat plate 31, thus improving the flatness of the sheet material. Simultaneously, the slightly higher upper surface of the suction cup 33 facilitates an effective seal between the suction cup 33 and the sheet material, enhancing the adsorption effect. By using suction cup 33 to fix the material, the flatness of the sheet is further improved, which helps to improve the accuracy of the inspection.

[0066] It is worth noting that if there is air leakage in the pipeline between the suction cup 33 and the suction component 34 during the air extraction process, it will cause unstable negative pressure and affect the suction effect of the suction cup 33 on the board.

[0067] To at least partially address the above problems, in some embodiments, please refer to Figure 7 A check valve 35 is provided between the suction cup 33 and the suction assembly 34. The check valve 35 is a one-way valve. The check valve 35 allows airflow from the suction cup 33 to the suction assembly 34, but prevents airflow from the suction assembly 34 to the suction cup 33. The check valve 35 can be set at the air inlet position of the suction cup mounting base.

[0068] In this embodiment, the check valve 35 is used to prevent air leakage during the material suction process. When the suction assembly 34 is working, airflow flows from the suction cup 33 through the check valve 35 to the suction assembly 34, creating a negative pressure. When the suction assembly 34 stops working or pressure fluctuations occur in the pipeline, the check valve 35 can prevent airflow from the suction assembly 34 to the suction cup 33, which helps maintain a stable negative pressure environment. By setting the check valve 35, the suction effect of the suction cup 33 on the sheet material is improved, which helps to improve the fixation stability of the sheet material and the accuracy of detection.

[0069] In some embodiments, please continue reading Figure 5 and Figure 6 The transmission device 100 also includes a conversion plate 4, which is plate-shaped and fixedly mounted on the frame of the transmission device 100. A cylinder 32 is mounted on the conversion plate 4, with its cylinder body fixed to the conversion plate 4. The piston rod of the cylinder 32 is connected to a flat plate 31. The suction module 3 includes a guide shaft 36 and a limiting ring 37. The guide shaft 36 is cylindrical, and there can be two guide shafts 36, each positioned at one end of the flat plate 31. The guide shafts 36 pass through the conversion plate 4, which has through holes allowing the guide shafts 36 to slide within these holes relative to the conversion plate 4. The lower end of the guide shaft 36 is fixed to the flat plate 31, one end of the guide shaft 36 is positioned on the flat plate 31, and the upper end of the guide shaft 36 extends through the conversion plate 4 to the top of the conversion plate 4. The limiting ring 37 is sleeved on the guide shaft 36. The limiting ring 37 is located on the side of the conversion plate 4 away from the flat plate 31 and above the conversion plate 4. The limiting ring 37 can slide along the guide shaft 36 and is locked in a specific position on the guide shaft 36 by screws. The limiting ring 37 is covered with polyurethane to reduce impact.

[0070] In this embodiment, the guide shaft 36 guides the movement direction of the flat plate 31. The guide shaft 36 slides within the through hole of the conversion plate 4, limiting the flat plate 31 from shifting or rotating during movement, thus improving the stability of the flat plate 31's movement. By setting two guide shafts 36 at opposite ends of the flat plate 31, both ends of the flat plate 31 can be guided simultaneously, reducing the risk of tilting during lifting. The limiting ring 37 restricts the highest position of the flat plate 31. When the flat plate 31 rises to a predetermined height, the limiting ring 37 contacts the conversion plate 4, preventing the flat plate 31 from rising further and thus preventing damage to the cylinder 32 or affecting the normal operation of the equipment. The position of the limiting ring 37 can be adjusted by loosening the screws. Depending on the different plate thicknesses or testing requirements, the position of the limiting ring 37 can be adjusted to adjust the highest position of the flat plate 31, improving the adaptability of the transmission device 100. The polyurethane coating on the limiting ring 37 can reduce the impact when the flat plate 31 is in place, which helps to reduce vibration and noise and extend the service life of the equipment.

[0071] It is worth noting that although the guide shaft 36 can slide within the through hole of the conversion plate 4, there is a gap between the guide shaft 36 and the through hole. If the gap is large, the guide shaft 36 is prone to wobbling during sliding, affecting the guiding accuracy. In addition, the friction between the guide shaft 36 and the through hole is relatively large, affecting the smoothness of the movement of the flat plate 31.

[0072] To at least partially solve the above problems, in some embodiments, the material suction module further includes a linear bearing 38, which is a standard linear motion bearing. The linear bearing 38 is disposed on the conversion plate 4 and fixed on the conversion plate 4. The inner ring of the linear bearing 38 cooperates with the guide shaft 36, which passes through the linear bearing 38 and can slide in the inner ring of the linear bearing 38.

[0073] In this embodiment, by setting a linear bearing 38, a sliding connection is achieved between the guide shaft 36 and the conversion plate 4. The high fitting precision between the inner ring of the linear bearing 38 and the guide shaft 36 helps reduce the wobble of the guide shaft 36 during sliding and improves guiding accuracy. Simultaneously, the linear bearing 38 employs rolling friction, which reduces the friction between the guide shaft 36 and the conversion plate 4, improving the smoothness of the flattening plate 31's movement. Through the guiding effect of the linear bearing 38, the movement accuracy of the flattening plate 31 is improved, which helps enhance the flattening effect of the flattening plate 31 on the sheet material and the accuracy of inspection.

[0074] In some embodiments, please refer to Figure 1 and Figure 2The transmission device 100 also includes a support plate 5. The support plate 5 is plate-shaped and is located in the gap between the support plates 11 of the two fixed transmission modules 1. The upper surface of the support plate 5 is at the same level as or slightly lower than the upper surface of the conveyor belt 13. Along the first direction X, the support plate 5 is located in the first transmission section 111 of the support plate 11. The support plate 5 is located below the first transmission section 111 and is used to support the middle part of the plate material located in the first transmission section 111.

[0075] In this embodiment, by providing a support plate 5 in the first transmission section 111, the support plate 5 supports the middle part of the sheet material, providing additional support and reducing the risk of sagging or deformation of the sheet material in the first transmission section 111. The upper surface of the support plate 5 is at the same level as or slightly lower than the upper surface of the conveyor belt 13, allowing the sheet material to slide on the upper surface of the support plate 5 without obstructing its transmission, thus improving the smoothness of the sheet material transmission. Through the supporting effect of the support plate 5, the transmission stability of the sheet material in the first transmission section 111 is improved, which helps reduce the risk of deformation or displacement of the sheet material before entering the detection section 112.

[0076] It is worth noting that for some sheet metal, the front end of the sheet metal may not only bend upwards but also bend downwards. If the front end of the sheet metal bends downwards, it may interfere with the front end of the bearing plate 5, making it difficult for the sheet metal to enter the position between the second bearing 16 and the conveyor belt 13.

[0077] To at least partially solve the above problems, in some embodiments, in the first direction X, a guide slope 51 is provided at one end of the support plate 5 away from the detection section 112. The guide slope 51 is provided at the front end of the support plate 5 (i.e., the end away from the detection section 112). The guide slope 51 extends downward from the upper surface of the support plate 5 at an angle of 30 degrees to 60 degrees, for example 45 degrees. The length of the guide slope 51 can be 10 mm to 50 mm. The guide slope 51 is configured to guide the sheet material to be transferred into the first transfer section 111.

[0078] In this embodiment, when the front end of the sheet metal bends downwards, it first contacts the guide ramp 51. The inclination angle of the guide ramp 51 allows the front end of the sheet metal to slide upwards along it, guiding it into the position between the second bearing 16 and the conveyor belt 13. The guide ramp 51 reduces the risk that the sheet metal will not be able to enter the transmission section due to its front end bending downwards, thus improving the smoothness of the sheet metal feeding. The guide ramp 51 functions similarly to an inlet ramp, allowing the sheet metal to smoothly enter the first transmission section 111 regardless of whether its front end is tilted upwards or downwards, thereby improving the adaptability of the transmission device 100 to sheet metal in different states.

[0079] In some embodiments, there are two support plates 5, one located in the first transmission section 111 and the other in the second transmission section 113. The two support plates 5 are respectively used to support the middle portions of the sheet material entering from the first transmission section 111 and the second transmission section 113. Each support plate 5 has a guide ramp 51 at its end facing away from the detection section 112, so that the sheet material can be smoothly guided into the detection section 112 whether entering from the first transmission section 111 or the second transmission section 113. By providing support plates 5 and guide ramps 51 in both transmission sections, a symmetrical support and guiding structure is achieved, which is beneficial to improving the integrity and reliability of the bidirectional transmission function.

[0080] It is worth noting that different sheet thicknesses require different pressures between the bearing follower 22 and the conveyor belt 13. If the sheet is thicker, the distance between the bearing follower 22 and the conveyor belt 13 is smaller, and the sheet will be subjected to greater pressure, which may lead to deformation or damage. If the sheet is thinner, the distance between the bearing follower 22 and the conveyor belt 13 is larger, and the friction between the sheet and the conveyor belt 13 is smaller, which may cause the sheet to slip. Therefore, the distance between the bearing follower 22 and the conveyor belt 13 needs to be adjusted according to the thickness of the sheet.

[0081] To at least partially address the above problems, in some embodiments, please continue to refer to... Figure 1 and Figure 2 The active transmission module 2 also includes a drive component 23, a guide rail 24, and a slider 25. The guide rail 24 is a linear guide rail, mounted on and fixed to the support plate 11. The extension direction of the guide rail 24 is perpendicular to the upper surface of the conveyor belt 13. The slider 25 is a linear slider, slidably mounted on the guide rail 24. A movable plate 21 is fixed to the slider 25 and can slide along the guide rail 24 with the slider 25. The drive component 23 can be a cylinder, a motor, or a manual adjustment mechanism. The drive component 23 is mounted on the support plate 11, with its cylinder or body fixed to the support plate 11. The drive component 23 is connected to the movable plate 21, and its piston rod or output shaft is connected to the movable plate 21. The drive component 23 is configured to drive the movable plate 21 to slide along the guide rail 24.

[0082] In this embodiment, the movable plate 21 is driven by the driving component 23 to slide along the guide rail 24. The movable plate 21 can move up and down relative to the support plate 11, thereby adjusting the distance between the bearing follower 22 mounted on the movable plate 21 and the conveyor belt 13 according to the thickness of the sheet material. When the sheet material is thick, the driving component 23 drives the movable plate 21 to move upward, increasing the distance between the bearing follower 22 and the conveyor belt 13, reducing the pressure on the sheet material, and preventing the sheet material from being deformed or damaged due to excessive pressure. When the sheet material is thin, the driving component 23 drives the movable plate 21 to move downward, decreasing the distance between the bearing follower 22 and the conveyor belt 13, increasing the friction between the sheet material and the conveyor belt 13, which helps to improve the stability of the transmission and reduce the risk of the sheet material slipping. By adjusting the distance between the bearing follower 22 and the conveyor belt 13, the transmission device 100 can adapt to sheet materials of different thicknesses, which helps to improve the versatility and flexibility of the transmission device 100. The cooperation between the guide rail 24 and the slider 25 can ensure the accuracy and stability of the movement of the movable plate 21, which helps to improve the accuracy of the adjustment.

[0083] In some embodiments, the drive element 23 is a cylinder, and the piston rod of the cylinder is connected to the movable plate 21. By adjusting the air intake pressure of the cylinder, the pressure applied to the sheet metal by the bearing follower 22 can be adjusted. The cylinder has a fast response speed, enabling rapid adjustment.

[0084] In some embodiments, the drive element 23 is a motor, which is connected to the movable plate 21 via a lead screw or rack and pinion mechanism. By controlling the rotation angle of the motor, the moving distance of the movable plate 21 can be precisely controlled, thereby precisely adjusting the distance between the bearing follower 22 and the conveyor belt 13. The motor-driven method offers high adjustment precision, which is beneficial for achieving automated control.

[0085] In this embodiment, the conveyor belt 13 is driven by the drive motor 12 to carry and transport the sheet material. A movable transmission module 2 is used to rotatably mount the bearing follower 22 onto the movable plate 21. The bearing follower 22 abuts against the surface of the sheet material facing away from the conveyor belt 13, thereby increasing the friction between the sheet material and the conveyor belt 13. This improves the stability of the sheet material transport and reduces the risk of slippage in soft sheets. Simultaneously, the bearing follower 22 can flatten the edges of the sheet material, which helps improve the stability and accuracy of the inspection process.

[0086] This application further provides an embodiment of a testing device, which includes the aforementioned transmission device 100. The testing device can be an automated optical inspection device used for optical inspection of the surface of a sheet metal. By integrating the aforementioned transmission device 100, the testing device can achieve stable transmission and flatness inspection of the sheet metal during optical inspection, thereby improving the accuracy and efficiency of the inspection. For the specific structure and function of the transmission device 100, please refer to the above embodiments; further details will not be elaborated here.

[0087] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A transmitting device, characterized by, include: A fixed transmission module includes a support plate, a drive motor, a conveyor belt, and at least two pulleys. The drive motor is mounted on the support plate, and the two pulleys are rotatably mounted on the support plate, with the two pulleys located at opposite ends of the support plate. The conveyor belt is sleeved on the two pulleys, and the drive motor is connected to the conveyor belt. The support plate includes a first transmission section, a detection section, and a second transmission section. The first transmission section and the detection section are arranged along a first direction, and the second transmission section is located on the side of the detection section opposite to the first transmission section. The first direction is parallel to the transmission direction of the conveyor belt. The movable transfer module includes a movable plate and a bearing follower. The movable plate is disposed in the detection section, and the bearing follower is rotatably disposed on the movable plate. The bearing follower is configured to abut against the surface of the receiving transfer plate material away from the conveyor belt. The fixed transmission module further includes a first bearing, which is rotatably disposed on the first transmission section. The first bearing is configured to abut against the surface of the sheet material to be transmitted away from the conveyor belt, and the diameter of the first bearing is larger than the diameter of the bearing follower. The fixed transmission module further includes a third bearing, which is rotatably disposed on the second transmission section. The third bearing is configured to abut against the surface of the sheet material to be transmitted away from the conveyor belt, wherein the diameter of the third bearing is larger than the diameter of the bearing follower.

2. The transmission device according to claim 1, characterized in that, The fixed transmission module further includes a second bearing, which is rotatably disposed on the first transmission section. The diameter of the second bearing is larger than that of the first bearing, and in the first direction, the first bearing is closer to the detection section than the second bearing. The second bearing is configured to abut against the surface of the sheet material to be transmitted that is away from the conveyor belt.

3. The transmission device according to claim 1, characterized in that, The fixed transmission module further includes a fourth bearing, which is rotatably disposed on the second transmission section. The diameter of the fourth bearing is larger than that of the third bearing, and in the first direction, the third bearing is closer to the detection section than the fourth bearing. The fourth bearing is configured to abut against the surface of the sheet material to be transmitted that is away from the conveyor belt.

4. The transmission device according to any one of claims 1-3, characterized in that, There are two fixed transmission modules and two movable transmission modules. The two fixed transmission modules are spaced apart from each other, and the conveyor belts of the two fixed transmission modules are used together to carry and transport the sheet material to be transported. One movable transmission module is set on the support plate of one fixed transmission module. The bearing followers of the two movable transmission modules are respectively used to abut the surface of the sheet material to be transported away from the conveyor belt.

5. The transmission device according to claim 4, characterized in that, The conveying device includes a material suction module, which includes a flat plate and a cylinder. The flat plate is located between the support plates of the two fixed conveying modules. The cylinder is connected to the flat plate and is used to drive the flat plate to move along a second direction, which is perpendicular to the flat plate and also perpendicular to the conveying direction of the conveyor belt.

6. The transmission device according to claim 5, characterized in that, The material suction module includes a suction cup and an air extraction component. The air extraction component is connected to the suction cup. The suction cup is disposed on the first surface of the flat plate, and the first surface is configured to carry the material to be transferred.

7. The transmission device according to claim 6, characterized in that, A check valve is provided between the suction cup and the air extraction assembly.

8. The transmitting apparatus of claim 5, wherein, It also includes a conversion plate, on which the cylinder is disposed; The material suction module includes a guide shaft and a limiting ring. The guide shaft passes through the conversion plate and can slide relative to the conversion plate. One end of the guide shaft is disposed on the flat plate. The limiting ring is disposed on the guide shaft and is located on the side of the conversion plate opposite to the flat plate.

9. The transmission device according to claim 8, characterized in that, The material suction module also includes a linear bearing, which is disposed on the conversion plate, and the guide shaft passes through the linear bearing.

10. The transmitting apparatus of claim 4, wherein, It also includes a carrier plate, which is located between the support plates of the two fixed transmission modules and along the first direction, the carrier plate is located in the first transmission section of the support plate.

11. The transmission device according to claim 10, characterized in that, In the first direction, a guide ramp is provided at one end of the bearing plate away from the detection section, and the guide ramp is configured to guide the sheet material to be transferred into the first transfer section.

12. The transmission device according to claim 1, characterized in that, The movable transmission module further includes a driving component, a guide rail, and a slider. The guide rail is disposed on the support plate, the slider is slidably disposed on the guide rail, the movable plate is disposed on the slider, the driving component is disposed on the support plate, the driving component is connected to the movable plate, and the driving component is configured to drive the movable plate to slide along the guide rail.

13. A testing device, characterized in that, Includes the transmission device as described in any one of claims 1-12.

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