Conveying mechanism and material conveying device

Abstract

Disclosed in the present application are a conveying mechanism and a material conveying device. The conveying mechanism comprises at least one conveying wheel; the conveying wheel comprises a conveying surface for conveying a material strip, a plurality of through holes provided on the conveying surface, and a vacuum channel provided in the conveying wheel, the plurality of through holes being arranged in the circumferential direction of the conveying surface; and the conveying mechanism is configured such that when the conveying wheel rotates, at least one through hole is always in communication with the vacuum channel so as to achieve vacuum suction of the material strip. The present application can reduce the risk of displacement in a material strip conveying process.

Description

Conveying mechanism and material transfer device

[0001] This application is based on and claims priority to Chinese Patent Application No. 202510026889.9, filed on January 7, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of semiconductor manufacturing, and more particularly to a conveying mechanism and a material transfer device. Background Technology

[0003] In semiconductor chip manufacturing, chips are placed on a strip and transported. In existing technologies, internal lead bonding machines use a belt cam to control the opening and closing of grippers to transport the strip. When the grippers open, there is a risk of the strip shifting. Some existing technologies also use two conveyor rollers, with a clamping channel between adjacent rollers to hold and transport the strip. However, these lack a positioning device between the rollers, and the risk of strip shifting still exists. Summary of the Invention

[0004] One of the objectives of this application is to provide a conveying mechanism to solve the technical problem of belt slippage during conveying in the prior art.

[0005] One of the purposes of this application is to provide a material transfer device.

[0006] To achieve one of the above-mentioned objectives, one embodiment of this application provides a conveying mechanism, including at least one conveying wheel. The conveying wheel includes a conveying surface for conveying a material strip, a plurality of through holes disposed on the conveying surface, and a vacuum channel disposed within the conveying wheel. The plurality of through holes are arranged circumferentially along the conveying surface. The conveying mechanism is configured such that when the conveying wheel rotates, at least one of the through holes is always connected to the vacuum channel to achieve vacuum adsorption of the material strip.

[0007] As a further improvement of one embodiment of this application, the conveying mechanism is configured such that when the conveying wheel rotates, the through hole at the top end is connected to the vacuum channel.

[0008] As a further improvement of one embodiment of this application, the through hole at the top is parallel to the vertical direction.

[0009] As a further improvement of one embodiment of this application, the conveying mechanism includes at least two through holes located at the top, and the two through holes located at the top are symmetrically arranged about the vertical direction.

[0010] As a further improvement of one embodiment of this application, the central angle formed between two adjacent through holes along the circumference of the conveying surface ranges from 10° to 20°, and the through holes are evenly arranged.

[0011] As a further improvement of one embodiment of this application, the vacuum channel includes sub-vacuum cavities that are arranged one-to-one with the through holes, and the conveying mechanism includes a gravity block disposed in each of the sub-vacuum cavities, the gravity block being used to control the opening and closing of the sub-vacuum cavities and the through holes.

[0012] As a further improvement of one embodiment of this application, the conveying mechanism includes an elastic element disposed in the sub-vacuum cavity, the elastic element being disposed on the side of the gravity block opposite to the through hole.

[0013] As a further improvement of one embodiment of this application, the conveying mechanism is configured such that when the conveying wheel rotates, a portion of the gravity blocks tend to move outward along the radial direction of the conveying wheel, the gravity blocks abut against the through hole to cover the through hole, and the through hole and the sub-vacuum cavity are separated.

[0014] As a further improvement of one embodiment of this application, the conveying mechanism is configured such that when the conveying wheel rotates, the gravity block at the top presses down on the elastic member, a gap is formed between the gravity block at the top and the through hole, and the through hole is connected to the sub-vacuum cavity.

[0015] As a further improvement of one embodiment of this application, each of the through holes and sub-vacuum cavities is arranged radially along the conveyor wheel, and each of the through holes and its corresponding sub-vacuum cavity is aligned radially along the conveyor wheel.

[0016] As a further improvement of one embodiment of this application, the size of the through hole is smaller than the size of the sub-vacuum cavity.

[0017] As a further improvement of one embodiment of this application, the vacuum channel includes a vacuum cavity located in the central region of the conveyor wheel, and a plurality of the sub-vacuum cavities are located around the vacuum cavity and communicate with the vacuum cavity.

[0018] As a further improvement of one embodiment of this application, the vacuum cavity is a cylindrical cavity, and the central axis of the vacuum cavity coincides with the central axis of the transmission wheel.

[0019] As a further improvement of one embodiment of this application, the conveying wheel includes two sides located on both sides of the conveying surface, at least one of the sides having an opening, the opening being arranged along the central axis of the conveying wheel, and the opening communicating with a vacuum channel.

[0020] To achieve one of the above-mentioned objectives, one embodiment of this application provides a material transfer device, including the conveying mechanism described in any of the above technical solutions and a drive mechanism for driving the conveying mechanism to rotate.

[0021] As a further improvement of one embodiment of this application, the conveying mechanism includes a connecting block disposed at least on one side of the conveying wheel, the connecting block being connected to the drive structure, and the central axis of the connecting block coinciding with the central axis of the conveying wheel.

[0022] Compared with the prior art, this application provides a conveying mechanism that uses a conveying wheel with through holes and a vacuum channel. When the conveying wheel conveys the material belt, the through holes are connected to the vacuum channel to vacuum adsorb the material belt, thereby reducing the risk of material belt slippage during the conveying process. Attached Figure Description

[0023] Figure 1 is a schematic diagram of the transmission mechanism in one embodiment of this application.

[0024] Figure 2 is a schematic diagram of the conveying mechanism from another angle in one embodiment of this application.

[0025] Figure 3 is a schematic diagram of the transmission mechanism at another angle in one embodiment of this application.

[0026] Figure 4 is a cross-sectional view of a conveying mechanism used to absorb the conveyor belt in one embodiment of this application.

[0027] Figure 5 is a cross-sectional view of a conveying mechanism used to absorb material strips in another embodiment of this application.

[0028] Figure 6 is a cross-sectional view of a conveying mechanism used to adsorb the conveyor belt at another angle in one embodiment of this application.

[0029] Figure 7 is a schematic diagram of a material transfer device according to one embodiment of this application.

[0030] Figure 8 is a front view of the material transfer device according to one embodiment of this application.

[0031] Figure 9 is a side view of a material transfer device according to one embodiment of this application. Detailed Implementation

[0032] The present application will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present application, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of this application.

[0033] It should be noted that the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," "third," "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] The terms “connection,” “connected to,” or any other variations are intended to encompass various relative positions where a connection exists, including both direct and indirect connections. A direct connection can be formed through a pneumatic conduit, while an indirect connection can be formed through devices such as valves or sensors, through pneumatic components such as brake control units, or through any other medium such as air.

[0035] Please refer to Figures 1-3, which are schematic diagrams of a conveying mechanism 100 provided in one embodiment of this application, used for conveying a conveyor belt 200.

[0036] In one embodiment, the conveying mechanism 100 includes at least one conveying wheel 10. The conveying wheel 10 includes a conveying surface 101 for conveying the conveyor belt 200, a plurality of through holes 102 disposed on the conveying surface 101, and a vacuum channel disposed within the conveying wheel 10. The plurality of through holes 102 are arranged circumferentially along the conveying surface 101. The conveying mechanism 100 is configured such that, when the conveying wheel 10 rotates, at least one through hole 102 is always connected to the vacuum channel to achieve vacuum adsorption of the conveyor belt 200. Thus, when the conveying wheel 10 conveys the conveyor belt 200, it vacuum adsorbs the conveyor belt 200, preventing the conveyor belt 200 from shifting.

[0037] Referring to Figures 4 and 5, the conveying mechanism 100 is configured such that when the conveying wheel 10 rotates, the through hole 102A at the top end connects to the vacuum channel. In a specific embodiment, the conveying wheel 10 conveys the material belt 200 in a horizontal direction, and the top end of the conveying wheel 10 is used to support and convey the material belt 200, hence the through hole 102A at the top end is provided to vacuum adsorb the material belt 200.

[0038] It is understood that in other embodiments, when the conveyor wheel 10 conveys the material belt 200 in a vertical or other inclined direction, the through hole 102 provided at the side end of the conveyor wheel 10 or other places vacuum adsorbs the material belt 200.

[0039] In one embodiment, the through-hole 102A at the top is parallel to the vertical direction. Referring to Figure 4, the extension direction of the through-hole 102A at the top coincides with the vertical diameter of the conveyor wheel 10, and is used to vertically adsorb the material strip 200. The through-holes 102 at other locations are not connected to the vacuum channel and cannot adsorb the material strip 200, thus preventing the material strip 200 from being drawn into the conveyor wheel 10.

[0040] It is understandable that in the above embodiment, the spacing between two adjacent through holes 102 is relatively large. If two or more top through holes 102A simultaneously adsorb the material strip 200, it may cause the material strip 200 to bend.

[0041] In one embodiment, the conveying mechanism 100 includes at least two through holes 102A located at the top, which are symmetrically arranged about the vertical direction. Referring to Figure 5, in this embodiment, the distance between two adjacent through holes 102A at the top is relatively small. When a single through hole 102A is rotated to a vertical position, it can vacuum-adsorb the material strip 200. Because of the small distance between the two through holes 102A, the material strip 200 can also be adsorbed simultaneously. In other words, when the material strip 200 is located between the two through holes 102A, it can also be vacuum-adsorbed without causing the material strip 200 to bend.

[0042] During the conveying process, the conveyor wheel 10 rotates, and the conveyor belt 200 moves forward horizontally. It is understood that a through-hole 102A should have an adsorption force on the conveyor belt 200 from the moment it is about to contact it. The adsorption force is greatest when the conveyor belt 200 is completely aligned with the through-hole 102A. The through-hole 102A also has an adsorption force on the conveyor belt 200 as it gradually deviates from it. When the through-hole 102A deviates significantly from the conveyor belt 200, it can no longer provide vacuum adsorption, and the process switches to the next through-hole 102A to begin vacuum adsorption of the conveyor belt 200.

[0043] Understandably, during the process of switching from one top-positioned through-hole 102A to another top-positioned through-hole 102A adsorbing the material strip 200, if the distance between two adjacent through-holes 102A is large, the previous through-hole 102A gradually deviates from the material strip 200 and loses its adsorption force on the material strip 200, while the next through-hole 102A gradually approaches the material strip 200 but has not yet generated adsorption force on the material strip 200. Therefore, only one top through-hole 102A adsorbs the material strip 200.

[0044] Understandably, two adjacent through holes 102A may be in contact before switching to the next through hole 102A at the top for adsorption. After the previous through hole 102A adsorbs a certain distance, the next through hole 102A continues to adsorb the material strip 200. Although two through holes 102A cannot adsorb the material strip 200 simultaneously, continuous adsorption and positioning of the material strip 200 can still be achieved, preventing movement.

[0045] Of course, it's also possible that during the transition from one through-hole 102A to the next, the material strip 200 will have a short transmission distance free from adsorption forces. Understandably, this distance is also small and will not cause any risk of slippage.

[0046] It is understandable that during the process of switching from adsorbing the material strip 200 through one through hole 102A to adsorbing the material strip 200 through another through hole 102A, if the distance between two adjacent through holes 102A is small, the previous through hole 102A will gradually move away from the material strip 200, but will still have an adsorption force on the material strip 200, while the next through hole 102A will gradually approach the material strip 200 and will also have an adsorption force on the material strip 200. Therefore, there are situations where two through holes 102A can simultaneously have an adsorption force on the material strip 200. This allows for continuous adsorption and positioning of the material strip 200, preventing it from shifting.

[0047] In one embodiment, the central angle formed between two adjacent through holes 102 along the circumference of the conveying surface 101 ranges from 10° to 20°, and a plurality of through holes 102 are evenly arranged along the circumference of the conveying surface 101.

[0048] Referring to Figures 4-5, the conveying mechanism 100 includes 24 through holes 102 evenly arranged circumferentially, with a central angle of 15° between two adjacent through holes 102. During rotation, the through holes 102A at the top of two adjacent holes can alternately or simultaneously adsorb and position the material belt 200, achieving continuous adsorption and positioning.

[0049] In other embodiments, the conveying mechanism 100 is provided with more sets of through holes 102, for example, 36 sets. The central angle formed between two adjacent through holes 102 is 10°. In this case, during rotation, the through holes 102A at the two adjacent top ends can also simultaneously adsorb and position the material belt 200.

[0050] In other embodiments, the conveying mechanism 100 may reduce the number of through holes 102, for example, by providing 18 sets. The central angle formed between two adjacent through holes 102 is 20°, which can also achieve adsorption and positioning of the material belt 200 and prevent it from shifting.

[0051] In one embodiment, referring to Figures 4-5, the vacuum channel includes sub-vacuum cavities 103 that are arranged one-to-one with the through holes 102. The conveying mechanism 100 includes a gravity block 20 disposed in each sub-vacuum cavity 103, and the gravity block 20 is used to control the opening and closing of the sub-vacuum cavity 103 and the through hole 102.

[0052] Specifically, when gravity block 20 blocks through hole 102, through hole 102 cannot connect to sub-vacuum cavity 103. When gravity block 20 is a distance away from through hole 102, through hole 102 and sub-vacuum cavity 103 are connected, enabling through hole 102 to have vacuum adsorption function. It can be seen that through hole 102A located at the top must necessarily be connected to sub-vacuum cavity 103.

[0053] The size of the through hole 102 is smaller than the size of the sub-vacuum cavity 103. In other words, the size of the gravity block 20 is larger than the size of the through hole 102, so that the gravity block 20 can block the through hole 102.

[0054] The gravity block 20 can be a steel ball, copper block, or other material with a certain weight. There are no restrictions on the specific material or shape, as long as it can block the through hole 102. The weight requirement for the gravity block 20 will be detailed below.

[0055] In one embodiment, the conveying mechanism 100 includes an elastic element 30 disposed in the sub-vacuum cavity 103. The elastic element 30 is disposed on the side of the gravity block 20 opposite to the through hole 102. The elastic element 30 is a spring, and the elastic element 30 is located between the wall of the sub-vacuum cavity 103 and the gravity block 20.

[0056] It is known that the gravity block 20 has its own gravity, and is also subjected to the elastic force of the elastic element 30 and the centrifugal force generated during the rotation of the transmission wheel 10. The gravity is vertically downward, the elastic force is radially outward along the transmission wheel 10, and the centrifugal force is also radially outward along the transmission wheel 10. In other words, the elastic force and centrifugal force experienced by the gravity block 20 are directed towards its corresponding through hole 102.

[0057] For ease of understanding, the resultant force of elastic force and centrifugal force can also be decomposed into a first component in the vertical direction and a second component in the horizontal direction. The first component in the vertical direction can be superimposed on or canceled by gravity, while the second component in the horizontal direction has no other force to cancel it out, which makes the gravity block 20 have a tendency to move in the horizontal direction.

[0058] The conveying mechanism 100 is configured such that, when the conveying wheel 10 rotates, a portion of the gravity block 20 tends to move radially outward along the conveying wheel 10. The gravity block 20 abuts against the through hole 102 to cover the through hole 102, thus isolating the through hole 102 from the sub-vacuum chamber 103. This means that the through hole 102, at a non-top position, is not connected to the sub-vacuum chamber 103, saving vacuum and reducing costs.

[0059] The conveying mechanism is configured such that when the conveyor wheel 10 rotates, the gravity block 20 at the top presses down on the elastic element 30, forming a gap between the gravity block 20 at the top and the through hole 102. The through hole 102 is connected to the sub-vacuum chamber 103 and has an adsorption function to adsorb the material belt 200.

[0060] When the gravity of the gravity block 20 cannot counteract the elastic force and centrifugal force it experiences, the gravity block 20 will inevitably tend to move towards its corresponding through hole 102. Therefore, the through hole 102 can be blocked. When the gravity of the gravity block 20 can counteract the elastic force and centrifugal force it experiences, the gravity block 20 will tend to move downwards and gradually move away from the through hole 102, thus connecting the through hole 102 and the sub-vacuum cavity 103.

[0061] Specifically, let's first analyze the forces acting on the gravity block 20 located in the lower half of the conveyor wheel 10. At this point, the gravity block 20 is located vertically or obliquely below the elastic element 30, and the through hole 102 is also located vertically or obliquely below the gravity block 20. The elastic force and centrifugal force acting on the gravity block 20 are vertically or obliquely downwards. More specifically, the second component force is horizontally outwards, and the first component force is vertically downwards and superimposed on the gravity force, further increasing the tendency of the gravity block 20 to move towards the through hole 102. Therefore, the gravity block 20 located in the lower half of the conveyor wheel 10 completely blocks the through hole 102.

[0062] Next, let's analyze the forces acting on the gravity block 20 located on the horizontal radial direction of the conveyor wheel 10. At this point, the elastic element 30, gravity block 20, and through hole 102 are arranged sequentially outwards along the horizontal radial direction. The elastic force and centrifugal force acting on the gravity block 20 are directed outwards along the horizontal radial direction, and there is no first component force. The gravity acting on the gravity block 20 is perpendicular to the second component force and cannot cancel each other out; therefore, the gravity block 20 still tends to move towards the through hole 102. That is, the gravity block 20 located on the horizontal radial direction of the conveyor wheel 10 also blocks the through hole 102.

[0063] Let's continue analyzing the forces acting on the gravity block 20 located in the upper part of the conveyor wheel 10. This can be further divided into two cases.

[0064] The first case is the gravity block 20 located at the top, which corresponds to the through hole 102A located at the top and is located below the through hole 102A at the top.

[0065] The elastic force and centrifugal force experienced by the top gravity block 20 are vertically upward or nearly vertically upward. This is equivalent to experiencing only a vertically upward first component force or a vertically upward first component force and a smaller second component force. In this case, the gravity experienced by gravity block 20 is greater than the first component force, allowing gravity block 20 to move downward. Although a second component force may also exist, it does not affect the downward movement of gravity block 20. Therefore, the top gravity block 20 can overcome the elastic force and centrifugal force to press down on the elastic element 30, moving it away from the through hole 102A, which is connected to the sub-vacuum cavity 103.

[0066] In the second case, the gravity block 20 is located between the top and the horizontal radial direction. In this position, the gravity, elastic force, and centrifugal force acting on the gravity block 20 can partially cancel each other out, but it is still insufficient for the gravity block 20 to overcome the elastic force and centrifugal force and move away from the through-hole 102. Therefore, the through-hole 102 and the sub-vacuum cavity 103 are separated.

[0067] In one embodiment, each through hole 102 and sub-vacuum cavity 103 are arranged radially along the conveyor wheel 10, and each through hole 102 and its corresponding sub-vacuum cavity 103 are aligned radially along the conveyor wheel 10. In this way, radial communication between the through hole 102 and the sub-vacuum cavity 103 can be achieved.

[0068] More specifically, each through hole 102 and its corresponding gravity block 20 and elastic element 30 are arranged sequentially along the radial direction of the conveyor wheel 10.

[0069] The vacuum channel includes a vacuum cavity 104 located in the central region of the conveyor wheel 10, and several sub-vacuum cavities 103 located around and connected to the vacuum cavity 104. The sub-vacuum cavities 103 are evenly arranged and have the same size and shape. The central vacuum cavity 104 and the peripheral sub-vacuum cavities 103 together constitute the vacuum channel. The conveyor mechanism 100 evacuates the vacuum cavity 104 to achieve evacuation of the sub-vacuum cavities 103.

[0070] It is understandable that while the vacuum chamber 104 and the sub-vacuum chamber 103 are in a vacuum state, the through hole 102 located on the outer periphery of the sub-vacuum chamber 103 is not necessarily in a vacuum state; only the through hole 102 located at the top is in a vacuum state.

[0071] Referring to Figure 6, the vacuum cavity 104 is a cylindrical cavity. The central axis of the vacuum cavity 104 coincides with the central axis of the conveyor wheel 10. Several sub-vacuum cavities 103 are located between the vacuum cavity 104 and several through holes 102. One end of the several sub-vacuum cavities 103 is connected to the same vacuum cavity 104, and the other end of the several sub-vacuum cavities 103 is connected to several through holes 102 respectively.

[0072] In one embodiment, the conveyor wheel 10 includes two side surfaces located on both sides of the conveyor surface 101. At least one side surface has an opening 110, which is arranged along the central axis of the conveyor wheel and communicates with a vacuum channel. The opening 110 is used to connect an external vacuum pumping device to achieve vacuuming inside the conveyor wheel 10.

[0073] Specifically, referring to Figure 7, the conveyor wheel 10 includes connecting blocks 11 disposed on both sides, which are used to fix to the fixing frame 400. One of the connecting blocks 11 has an opening 110 along the central axis of the conveyor wheel 10.

[0074] Referring to Figure 7, this application includes a material transfer device 1000, which includes a transfer mechanism 100 of any of the above-described technical solutions and a drive mechanism 300 for driving the transfer mechanism 100 to rotate.

[0075] The conveying mechanism 100 includes a connecting block 11 disposed at least on one side of the conveying wheel 10, and the connecting block 11 is connected to the drive structure 300. The central axis of the connecting block 11 coincides with the central axis of the conveying wheel 10.

[0076] Two connecting blocks 11 are simultaneously fixed to the mounting bracket 400. One connecting block 11 is used to open the opening 110 and connect to the vacuum device, while the other connecting block 11 is used to connect to the drive structure 300 to realize the rotation of the transmission wheel 10.

[0077] Continuing with Figures 8-9, the material conveying device 1000 includes a fixed frame 400, the material belt 200 is conveyed at the top of the fixed frame 400, and the conveying mechanism 100 and the driving mechanism 300 are installed and fixed on the fixed frame 400 and located below the material belt 200.

[0078] The material conveying device 1000 includes two conveyor wheels 10 arranged opposite each other. The material belt 200 is located on the conveying surface 101 of the two conveyor wheels 10 and is conveyed by the two conveying surfaces 101. The drive mechanism 300 includes a drive shaft 310, the two ends of which are respectively connected to connecting blocks 11 of the two conveyor wheels 10 to drive the two conveyor wheels 10 to rotate simultaneously. The connecting blocks 11 for connecting the drive shaft 310 are arranged inwards opposite each other, and the connecting blocks 11 for opening the opening 110 are arranged outwards opposite each other.

[0079] The drive structure 300 includes a drive source, a drive wheel 320 connected to the drive source, and a driven wheel 330 connected to the drive wheel 320. A drive shaft 310 passes through the center of the driven wheel 330, and the central axis of the drive shaft 310 coincides with the central axis of the driven wheel 330. Thus, the drive wheel 320 drives the driven wheel 330 to rotate, the driven wheel 330 drives the drive shaft 310 to rotate, and both ends of the drive shaft 310 simultaneously drive the two transmission wheels 10 to rotate.

[0080] The beneficial effects of this application are as follows: the conveyor wheel 10 is provided with a through hole 102 and a vacuum channel. When the conveyor wheel 10 conveys the material belt 200, the through hole 102 connects to the vacuum channel to vacuum-adhere the material belt 200, reducing the risk of the material belt 200 shifting during the conveying process. The through hole 102A at the top of the conveyor wheel 10 is used to vacuum-adhere the material belt 200. The gravity block 20 and the elastic element 30 work together to open or close the vacuum state of the through hole 102.

[0081] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0082] The series of detailed descriptions listed above are only specific descriptions of the feasible implementation manners of this application, and they are not intended to limit the protection scope of this application. Any equivalent implementation manners or modifications made without departing from the technical spirit of this application shall be included within the protection scope of this application.

Claims

1. A conveying mechanism, characterized in that, The device includes at least one conveyor wheel, which includes a conveying surface for conveying a material strip, a plurality of through holes disposed on the conveying surface, and a vacuum channel disposed within the conveyor wheel. The plurality of through holes are arranged circumferentially along the conveying surface. The conveying mechanism is configured such that when the conveyor wheel rotates, at least one of the through holes is always connected to the vacuum channel to achieve vacuum adsorption of the material strip.

2. The conveying mechanism according to claim 1, characterized in that, The conveying mechanism is configured such that when the conveying wheel rotates, the through hole at the top end connects to the vacuum channel.

3. The conveying mechanism according to claim 2, characterized in that, The through hole at the top is parallel to the vertical direction.

4. The conveying mechanism according to claim 2, characterized in that, The conveying mechanism includes at least two through holes at the top, which are symmetrically arranged about the vertical direction.

5. The conveying mechanism according to claim 1, characterized in that, Along the circumference of the conveying surface, the central angle formed between two adjacent through holes ranges from 10° to 20°, and several of the through holes are evenly arranged.

6. The conveying mechanism according to claim 1, characterized in that, The vacuum channel includes sub-vacuum cavities that correspond one-to-one with the through holes. The conveying mechanism includes a gravity block disposed in each of the sub-vacuum cavities. The gravity block is used to control the opening and closing of the sub-vacuum cavities and the through holes.

7. The conveying mechanism according to claim 6, characterized in that, The conveying mechanism includes an elastic element disposed in the sub-vacuum cavity, the elastic element being disposed on the side of the gravity block opposite to the through hole.

8. The conveying mechanism according to claim 7, characterized in that, The conveying mechanism is configured such that when the conveying wheel rotates, a portion of the gravity blocks tend to move outward along the radial direction of the conveying wheel, the gravity blocks abut against the through hole to cover the through hole, and the through hole is separated from the sub-vacuum cavity.

9. The conveying mechanism according to claim 7, characterized in that, The conveying mechanism is configured such that when the conveying wheel rotates, the gravity block at the top presses down on the elastic element, and a gap is formed between the gravity block at the top and the through hole, and the through hole is connected to the sub-vacuum cavity.

10. The conveying mechanism according to claim 6, characterized in that, Each of the aforementioned through holes and sub-vacuum cavities is arranged radially along the conveyor wheel, and each of the aforementioned through holes and its corresponding sub-vacuum cavity is aligned radially along the conveyor wheel.

11. The conveying mechanism according to claim 6, characterized in that, The size of the through hole is smaller than the size of the sub-vacuum cavity.

12. The conveying mechanism according to claim 6, characterized in that, The vacuum channel includes a vacuum cavity located in the central region of the conveyor wheel, and a plurality of sub-vacuum cavities located around the vacuum cavity and connected to the vacuum cavity.

13. The conveying mechanism according to claim 11, characterized in that, The vacuum cavity is a cylindrical cavity, and the central axis of the vacuum cavity coincides with the central axis of the transmission wheel.

14. The conveying mechanism according to claim 1, characterized in that, The conveyor wheel includes two sides located on both sides of the conveyor surface, and at least one side has an opening. The opening is arranged along the central axis of the conveyor wheel and communicates with a vacuum channel.

15. A material transfer device, characterized in that, It includes the conveying mechanism as described in any one of claims 1-14 and a drive mechanism for driving the conveying mechanism to rotate.

16. The material transfer device according to claim 15, characterized in that, The conveying mechanism includes a connecting block disposed on at least one side of the conveying wheel, the connecting block being connected to the drive structure, and the central axis of the connecting block coinciding with the central axis of the conveying wheel.

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