Thermal processing furnace apparatus for solar cells

Abstract

This invention discloses a heat treatment furnace for solar cells, comprising a frame, a heating unit mounted on the frame, and a conveying unit penetrating the heating unit. The conveying unit includes: a first and a second conveying chain symmetrically arranged; multiple connecting rods, each having a conveying portion and a first and a second connecting portion located on either side of the conveying portion; and a limiting component for connecting to the portions of the first and second connecting portions extending beyond the first and second conveying chains. This invention can reduce vibration during conveying and improve conveying efficiency. Furthermore, by connecting the first and second conveying chains to the first and second connecting portions respectively, the influence of connecting rod deformation on the conveying process is eliminated.

Description

Technical Field

[0001] This invention relates to the field of solar cell fabrication, specifically to a heat treatment furnace for solar cells. Background Technology

[0002] In the manufacturing process of solar cells, after the solar cells are printed with metal paste, they need to be transported to a heat treatment furnace where the paste undergoes high-temperature heat treatment. Common heat treatment furnaces include drying furnaces and sintering furnaces. During the drying process in the drying furnace and the sintering process in the sintering furnace, a conveying device is required to transport the solar cells. In existing technologies, when the conveying device needs to move synchronously with the solar cells, a mesh chain conveyor is generally used. The solar cells are placed on a mesh chain and transported by chains connected to the mesh chain. However, the mesh chain itself has a vibration problem, which affects the heat treatment quality of the solar cells. Summary of the Invention

[0003] In order to overcome the defects in the existing technology, the inventors tried to replace the chain with a link structure. They attempted to solve the above problems by replacing the mesh chain with a link and fixing it to the chain. However, they found that the high temperature in the heat treatment furnace would cause the link to deform, which would affect the conveying effect in the heat treatment furnace. As a result, the problem of poor heat treatment quality of solar cells still existed, and the above solution was not feasible.

[0004] This invention provides a heat treatment furnace for solar cells, which is used to solve one or more of the above-mentioned problems.

[0005] This application discloses a solar cell heat treatment furnace device, including a frame, a heating unit disposed on the frame, and a conveying unit passing through the heating unit. The conveying unit includes: a first and a second conveying chain symmetrically arranged; multiple connecting rods, each connecting rod having a conveying portion and a first and a second connecting portion located on both sides of the conveying portion. The first connecting portion passes through the first conveying chain and partially extends outside the first conveying chain. The end of the conveying portion near the first connecting portion abuts against the first conveying chain. The second connecting portion passes through the second conveying chain and partially extends outside the second conveying chain. A predetermined distance exists between the end of the conveying portion near the second connecting portion and the first conveying chain; a limiting component, the limiting component being used to connect with the portions of the first connecting portion extending out of the first conveying chain and the portions of the second connecting portion extending out of the second conveying chain.

[0006] Furthermore, the conveying unit includes a support bar extending in a straight direction, and the first transmission chain and the second transmission chain are respectively disposed on different support bars; the frame also includes a limiting and fixing unit, the limiting and fixing unit including a fixing block connected to the support bar, the fixing block having a clearance groove for the support bar to pass through.

[0007] Furthermore, the fixing block is connected to a side plate at the same height as the connecting rod. In the opposite direction of the movement of the part of the connecting rod located in the clearance groove, the side plate gradually extends away from the bottom of the clearance groove from the connecting rod.

[0008] Furthermore, the limiting component is at least one of a retaining ring or a cotter pin.

[0009] Furthermore, the connecting rod is fitted with a support ring for supporting the solar cell, the inner diameter of the support ring being smaller than the outer diameter of the connecting rod.

[0010] Furthermore, the first transmission chain and the second transmission chain have protruding abutment portions at their ends in the extension direction of the link, the abutment portions being able to abut against the transmission portion and the limiting component.

[0011] Furthermore, the end of the transmission section has a transition surface whose cross-sectional area gradually decreases from the inside to the edge in its extending direction and a plane located at the edge of the transition surface, and the abutting part is provided corresponding to the end of the transmission section.

[0012] Furthermore, it includes a drive unit, which includes a bearing fixing unit mounted on the frame, a rolling bearing detachably mounted on the bearing fixing unit, and a first sprocket connected to the inner ring of the rolling bearing. The two first sprockets are connected to the first transmission chain and the second transmission chain.

[0013] Furthermore, the bearing fixing unit includes a bearing support seat connected to the frame and a bearing pressure block detachably connected to the bearing support seat. The bearing support seat and the bearing pressure block respectively have a first contact surface and a second contact surface for accommodating the outer ring of the rolling bearing. The first contact surface and the second contact surface are correspondingly arranged, and the edges of the first contact surface and the second contact surface are provided with limiting portions for abutting against the outer ring of the rolling bearing.

[0014] Furthermore, it includes a tensioning unit, which includes a guide post disposed on the frame and a counterweight guide block disposed on the guide post. The extension direction of the guide post forms an angle with the horizontal plane. The counterweight guide block is connected to a second sprocket, and the second sprocket is connected to at least one of the first transmission chain and the second transmission chain.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. Since each connecting rod is connected to both ends of the first and second transmission chains respectively, the connecting rod can maintain relative stability with the first and second transmission chains. Furthermore, because the rigidity of the connecting rod itself is greater than that of the mesh chain, vibration during transport can be reduced, improving transport efficiency. In addition, by connecting the first and second transmission chains to the first and second connecting parts respectively, during the transport of solar cells in the heating unit, when the temperature changes, the relative position between the first connecting part and the first transmission chain remains stable, while the second connecting part can deform under temperature changes and move relative to the second transmission chain, thereby eliminating the influence of the connecting rod's own deformation on the transport process.

[0017] 2. After the clearance groove is opened to allow the first and second transmission chains to move, the upper and lower ends of the fixing block can be set on the frame, so that the fixing block itself has good stability, so as to provide stable support for the support bar, avoid deformation of the support bar, especially the middle part, and thus improve the stability of the transport of solar cells.

[0018] 3. The baffle plate can guide the connecting rod located outside the fixed block, so that the connecting rod is gradually moved by the baffle plate into the range of the clearance groove along its extension direction, so as to avoid the connecting rod contacting the bottom of the clearance groove, thereby achieving the effect of adjusting the relative position of the connecting rod and the fixed block, and improving the delivery efficiency of the solar cell.

[0019] 4. During the contact process between the transmission part and the abutting part, the abutting part provides a good guiding effect on the transmission part, and the transmission part extending into the abutting part has good stability.

[0020] 5. Since the bearing pressure block is detachable from the bearing support seat, the first contact surface and the second contact surface can be the same as the outer diameter of the rolling bearing, thereby enabling the bearing fixing unit to have a better fixing effect on the rolling bearing.

[0021] 6. The second sprocket can tension the first transmission chain and / or the second transmission chain under the action of the counterweight guide block. The entire structure improves the stability of the second sprocket during the tensioning process by relying on the weight of the counterweight guide block and the limiting effect of the guide shaft.

[0022] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the heat treatment furnace equipment for solar cells in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of a heat treatment furnace for solar cells in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the connecting rod in an embodiment of the present invention;

[0027] Figure 4 This is a detailed view of the connecting rod in an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram showing the positional relationship between the connecting rod and the first and second transmission chains in an embodiment of the present invention;

[0029] Figure 6 This is a detailed view of the connection between the connecting rod and the first transmission chain in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the drive unit in an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the bearing fixing unit in an embodiment of the present invention;

[0032] The reference numerals in the above figures are as follows: 1. Frame; 11. Limiting and fixing unit; 111. Fixing block; 112. Clearance groove; 113. Side plate; 2. Heating unit; 3. Conveying unit; 31. First transmission chain; 32. Second transmission chain; 33. Connecting rod; 331. Transmission part; 3311. Transition surface; 3312. Plane; 332. First connecting part; 333. Second connecting part; 34. Limiting component; 35. Support bar; 4. Abutment part; 5. Drive unit; 51. Bearing fixing unit; 511. Bearing support seat; 5111. First contact surface; 512. Bearing pressure block; 5121. Second contact surface; 52. Limiting part; 53. Rolling bearing; 54. First sprocket; 6. Tensioning unit; 61. Guide column; 62. Counterweight guide block; 63. Second sprocket; 7. Solar cell. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figures 1 to 8 As shown, a solar cell heat treatment furnace apparatus according to this embodiment includes a frame 1 and a conveying unit 3 disposed on the frame 1. The frame 1 supports the conveying unit 3 to ensure structural stability of the conveying unit 3. The conveying unit 3 includes:

[0035] The first transmission chain 31 and the second transmission chain 32 are symmetrically arranged. The first transmission chain 31 can be composed of multiple chain units of different widths connected alternately, so that the first transmission chain 31 can have a good rotation effect during transmission. The connection position of each chain unit can be a hollow structure, so that the connecting rod 33 can be inserted through the hollow structure. This allows the connecting rod 33 to connect with the first transmission chain 31 at the connection position of each chain unit, thereby avoiding interference with the connecting rod 33 during the relative movement of the chain units. Correspondingly, the shape of the symmetrically arranged second transmission chain 32 can be the same as that of the first transmission chain 31. The symmetrical arrangement of the second transmission chain 32 and the first transmission chain 31 allows the second transmission chain 32 to cooperate with the first transmission chain 31 to synchronously transport the connecting rod 33. Preferably, both the first transmission chain 31 and the second transmission chain 32 transmit in a straight line to drive the connecting rod 33 and the solar cell 7 located on it to move in a straight line.

[0036] Multiple connecting rods 33, each having a transmission section 331 and a first connecting section 332 and a second connecting section 333 located on both sides of the transmission section 331. The transmission section 331 carries the solar cell 7 and drives the solar cell 7 to move forward synchronously with the first transmission chain 31 and the second transmission chain 32. The cross-sectional shape of the transmission section 331 perpendicular to its extension direction can be circular, so that the solar cell 7 can be placed on the upper end of the multiple transmission sections 331 after being placed behind the multiple connecting rods 33, so that the solar cell 7 can move with the multiple transmission sections 331 during the transportation process. The first connecting section 332 passes through the first transmission chain 31 and partially extends out of the first transmission chain 31. The end of the transmission section 331 near the first connecting section 332 abuts against the first transmission chain 31, thereby fixing the first transmission chain 31 and the transmission section 331 relatively, improving the stability of the connecting rods 33 during the transportation process. The second connecting part 333 passes through the second transmission chain 32 and partially extends out of the second transmission chain 32. The end of the transmission part 331 near the second connecting part 333 has a preset distance from the first transmission chain 31, so that when the connecting rod 33 deforms during the high-temperature heat treatment process, the relative position between the second connecting part 333 and the second transmission chain 32 can change.

[0037] A limiting component 34 is provided to connect with the portions of the first connecting portion 332 extending out of the first transmission chain 31 and the second connecting portion 333 extending out of the second transmission chain 32, so that the limiting component 34 can abut against the first transmission chain 31 and the second transmission chain 32. Preferably, the distance between the limiting component 34 on the first connecting portion 332 and the transmission portion 331 is slightly larger than the width of the first transmission chain 31, thereby providing a deformation allowance for the first connecting portion 332, which can be 1-2 mm. The limiting unit on the second connecting portion 333 can abut against or be isolated from the second transmission chain 32.

[0038] In this embodiment, when the conveying unit 3 drives the solar cell 7 on it to be heated and heat-treated in the heating unit 2, the connecting rod 33 expands due to the increase in temperature inside the heating unit 2. The first connecting part 332 is fixed under the limiting effect of the limiting component 34 and the first transmission chain 31 connected to it. The second connecting part 333 can generate relative movement with the second transmission chain 32 along the extension direction of the connecting rod 33, so that when the temperature inside the heating unit 2 changes, the connecting rod 33 only deforms at the position of the second connecting part 333. During the temperature rise process, the first connecting part 332 and the second connecting part 333 deform in their circumferential direction to reduce the distance from the inner wall of the first transmission chain 31 and the second transmission chain 32, respectively.

[0039] With the above structure, since each connecting rod 33 is connected to the first transmission chain 31 and the second transmission chain 32 at both ends, the connecting rod 33 can maintain relative stability with the first transmission chain 31 and the second transmission chain 32. Furthermore, because the rigidity of the connecting rod 33 is greater than that of the mesh chain, vibration during the conveying process can be reduced, improving conveying efficiency. In addition, by connecting the first transmission chain 31 and the second transmission chain 32 to the first connecting part 332 and the second connecting part 333 respectively, during the process of conveying the solar cell 7 in the heating unit 2, when the temperature changes, the relative position between the first connecting part 332 and the first transmission chain 31 can remain stable, while the second connecting part 333 can deform under temperature changes and move relative to the second transmission chain 32, thereby eliminating the influence of the deformation of the connecting rod 33 itself on the conveying process.

[0040] Specifically, such as Figure 2 As shown, the conveying unit 3 includes a support bar 35 extending in a straight direction. The first transmission chain 31 and the second transmission chain 32 are respectively disposed on different support bars 35. The support bar 35 is used to support the first transmission chain 31 and the second transmission chain 32 during their movement. The support bar 35 can be disposed below the first transmission chain 31 and the second transmission chain 32 and rotatably connected to the rotating wheel on it. The rotating wheel is located at the connection position of the chain unit so that the first transmission chain 31 and the second transmission chain 32 can slide relative to the support bar 35.

[0041] The frame 1 also includes a limiting and fixing unit 11, which includes a fixing block 111 connected to the support strip 35. The fixing block 111 is disposed on the frame 1 to provide good stability. In one optional embodiment, multiple fixing blocks 111 are arranged in the extending direction of the support strip 35 to provide stable support in the conveying direction of the support strip 35. In another optional embodiment, the middle part of each support strip 35 is connected to the fixing block 111 to support the part most prone to deformation, thereby providing stable support. The fixing block 111 has a clearance groove 112 for the support strip 35 to pass through, so as to avoid interference with the first transmission chain 31 or the second transmission chain 32.

[0042] With the above structure, after the clearance groove 112 is opened to allow the first transmission chain 31 and the second transmission chain 32 to move, the upper and lower ends of the fixing block 111 can be set on the frame 1, so that the fixing block 111 itself has good stability, so as to provide stable support for the support bar 35, avoid deformation of the support bar 35, especially the middle part, and thus improve the transport stability of the solar cell 7.

[0043] Specifically, such as Figure 2As shown, the fixing block 111 is connected to a baffle plate 113 at the same height as the connecting rod 33. In the opposite direction of the movement of the part of the connecting rod 33 located within the clearance groove 112, the baffle plate 113 gradually extends away from the bottom of the clearance groove 112 and away from the connecting rod 33. Since the first connecting part 332 and the first transmission chain 31, as well as the second connecting part 333 and the second transmission chain 32, can all move relative to each other along the extension direction of the connecting rod 33, it is possible for the edge of the connecting rod 33 to extend out of the clearance groove 112. The above structure allows the baffle plate 113 to guide the connecting rod 33 located outside the fixing block 111, so that the connecting rod 33 is gradually moved by the baffle plate 113 into the range of the clearance groove 112 along its extension direction, so as to avoid the connecting rod 33 contacting the bottom of the clearance groove 112, thereby achieving the effect of adjusting the relative position of the connecting rod 33 and the fixing block 111, and improving the transmission efficiency of the solar cell 7.

[0044] Specifically, the limiting component 34 is at least one of a retaining ring or a cotter pin. In one optional embodiment, the limiting component 34 is a cotter pin extending into the first connecting portion 332 and the second connecting portion 333, so as to limit the connecting rod 33 by abutting against the first transmission chain 31 or the second transmission chain 32 through its edge. In another optional embodiment, the limiting component 34 is a retaining ring engaged with the first connecting portion 332 and the second connecting portion 333, so as to limit the connecting rod 33 by abutting against the first transmission chain 31 or the second transmission chain 32 through its edge. Yet another optional embodiment, such as... Figure 6 As shown, the limiting component 34 includes a retaining ring that is engaged on the first connecting part 332 and the second connecting part 333 and a cotter pin disposed adjacent thereto. The retaining ring can limit the rotation of the cotter pin to improve the stability of the limiting component 34 itself.

[0045] Specifically, the connecting rod 33 is fitted with a support ring (not shown in the figure) for supporting the solar cell 7. The inner diameter of the support ring is smaller than the outer diameter of the connecting rod 33, so that the support ring can be mounted on the connecting rod 33. The support ring can be made of high-temperature resistant rubber or fluororubber, so that the support ring can provide stable support for the solar cell 7 it supports during high-temperature heat treatment and protect the solar cell 7.

[0046] Preferred, such as Figure 3 As shown, the cross-sectional areas of the first connecting portion 332 and the second connecting portion 333 in the direction perpendicular to the extension of the connecting rod 33 are smaller than the cross-sectional area of ​​the transmission portion 331. This is so that the limiting component 34 and the transmission portion 331 are located on both sides of the first transmission chain 31 and the second transmission chain 32, respectively, and thus provide a limiting effect on the first transmission chain 31 and the second transmission chain 32.

[0047] Specifically, such as Figure 6As shown, the first transmission chain 31 and the second transmission chain 32 have protruding abutment portions 4 at their ends in the extension direction of the connecting rod 33. The abutment portions 4 can abut against the transmission part 331 and the limiting component 34. This ensures that the abutment portions 4 abut against the transmission part 331 or the limiting component 34 first, thereby protecting the first transmission chain 31 or the second transmission chain 32.

[0048] Preferred, such as Figure 4 As shown, the end of the transmission section 331 has a transition surface 3311 whose cross-sectional area gradually decreases from the inside to the edge in its extending direction, and a plane 3312 located at the edge of the transition surface 3311. The abutment portion 4 is correspondingly provided with the end of the transmission section 331. This structure ensures that during the contact process between the transmission section 331 and the abutment portion 4, the interior of the abutment portion 4 contacts the smaller portion of the transition surface 3311 first, thus guiding it. This allows the end of the transmission section 331 to gradually extend into the abutment portion 4, and finally, its plane 3312 corresponds to the abutment portion 4, resulting in a stable connection between the transmission section 331 and the abutment portion 4. This structure also ensures that during the contact process between the transmission section 331 and the abutment portion 4, the abutment portion 4 provides good guidance for the transmission section 331 and provides good stability for the transmission section 331 extending into the abutment portion 4.

[0049] Specifically, such as Figure 7 As shown, the system includes a drive unit 5, which includes a bearing fixing unit 51 mounted on the frame 1, a rolling bearing 53 detachably mounted on the bearing fixing unit 51, and a first sprocket 54 connected to the inner ring of the rolling bearing 53. The first sprocket 54 is connected to a first transmission chain 31 and a second transmission chain 32. At least one of the first sprockets 54 can be connected to a power device so that the power device can drive the first sprocket 54 to rotate, thereby causing the first sprocket 54 to drive the first transmission chain 31 and the second transmission chain 32 to rotate, thus providing a power source for the conveying unit 3.

[0050] Specifically, such as Figure 8As shown, the bearing fixing unit 51 includes a bearing support 511 connected to the frame 1 and a bearing pressure block 512 detachably connected to the bearing support 511. The bearing support 511 and the bearing pressure block 512 respectively have a first contact surface 5111 and a second contact surface 5121 for accommodating the outer ring of the rolling bearing 53. The first contact surface 5111 and the second contact surface 5121 are correspondingly arranged. Since the bearing pressure block 512 is detachable from the bearing support 511, the first contact surface 5111 and the second contact surface 5121 can be the same as the outer diameter of the rolling bearing 53, thereby enabling the bearing fixing unit 51 to have a better fixing effect on the rolling bearing 53. Both the first contact surface 5111 and the second contact surface 5121 have limiting portions 52 at their edges for abutting against the outer ring of the rolling bearing 53. The limiting portions 52 can be stop structures provided on the bearing support 511 and / or the bearing pressure block 512, or they can be baffles connected to the bearing support 511 and / or the bearing pressure block 512. Figure 7 As shown, in this embodiment, the limiting part 52 is a stop structure and a baffle connected to the bearing support seat 511 and the bearing pressure block 512, respectively, which together provide a good fixing effect on the rolling bearing 53.

[0051] Specifically, such as Figure 2 As shown, the device includes a tensioning unit 6, which comprises a guide post 61 mounted on the frame 1 and a counterweight guide block 62 mounted on the guide post 61. The extension direction of the guide post 61 forms an angle with the horizontal plane 3312, so that under the action of gravity, the counterweight guide block 62 tends to move downward on the guide post 61. The counterweight guide block 62 is connected to a second sprocket 63, which is connected to at least one of the first transmission chain 31 and the second transmission chain 32. This allows the second sprocket 63 to tension the first transmission chain 31 and / or the second transmission chain 32 under the action of the counterweight guide block 62. The entire structure improves the stability of the second sprocket 63 during the tensioning process by utilizing the weight of the counterweight guide block 62 itself and the limiting effect of the guide shaft 61. Of course, the counterweight guide block 62 can also be connected to a weight to increase its weight.

[0052] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A thermal processing furnace apparatus for solar cells, characterized by, The machine frame, a heating unit arranged on the machine frame, and a conveying unit penetrating through the heating unit, wherein the conveying unit comprises: a first transmission chain and a second transmission chain arranged symmetrically; a plurality of connecting rods, each of which has a transmission part and first and second connecting parts located on both sides of the transmission part, the first connecting part penetrating through the first transmission chain and partially extending outside the first transmission chain, the transmission part abutting against the first transmission chain near the end of the first connecting part, the second connecting part penetrating through the second transmission chain and partially extending outside the second transmission chain, and the transmission part having a preset distance from the second transmission chain near the end of the second connecting part; a limiting assembly for connecting with the part of the first connecting part extending outside the first transmission chain and the part of the second connecting part extending outside the second transmission chain; the conveying unit comprises support strips extending in a straight line direction, and the first transmission chain and the second transmission chain are arranged on different support strips respectively; the machine frame further comprises a limiting and fixing unit, which comprises a fixing block connected with the support strips, and the fixing block has an avoiding slot for allowing the first transmission chain or the second transmission chain to pass through; the fixing block is connected with a baffle plate at the same height as the connecting rod, and the baffle plate extends away from the connecting rod from the bottom of the avoiding slot in the opposite direction of the movement of the part of the connecting rod located in the avoiding slot.

2. The solar cell heat treatment furnace apparatus according to claim 1, wherein The limiting assembly is at least one of a clasp spring or a split pin.

3. The solar cell heat-treating furnace apparatus according to claim 1, wherein The connecting rod is sleeved with a support ring for supporting a solar cell, and the inner diameter of the support ring is smaller than the outer diameter of the connecting rod.

4. The solar cell heat-treating furnace apparatus according to claim 1, wherein The end of the first transmission chain and the second transmission chain in the extension direction of the connecting rod has a protruding abutting part, which can abut against the transmission part and the limiting assembly.

5. The solar cell thermal processing furnace apparatus of claim 4, wherein, The end of the transmission part has a transition surface with a gradually decreasing cross-sectional area from the inside to the edge in the extension direction thereof and a flat surface located at the edge of the transition surface, and the abutting part is arranged correspondingly at the end of the transmission part.

6. The solar cell thermal processing furnace apparatus of claim 1, wherein, The driving unit comprises a bearing fixing unit arranged on the machine frame, a rolling bearing detachably arranged on the bearing fixing unit, and a first sprocket connected with the inner ring of the rolling bearing, and two first sprockets are connected with the first transmission chain and the second transmission chain.

7. The solar cell thermal processing furnace apparatus of claim 6, wherein, The bearing fixing unit comprises a bearing support seat connected with the machine frame and a bearing pressing block detachably connected with the bearing support seat, the bearing support seat and the bearing pressing block respectively have a first contact curved surface and a second contact curved surface for accommodating the outer ring of the rolling bearing, the first contact curved surface and the second contact curved surface are arranged correspondingly, and the edges of the first contact curved surface and the second contact curved surface are respectively provided with limiting parts for abutting against the outer ring of the rolling bearing.

8. The solar cell thermal processing furnace apparatus of claim 7, wherein, The tensioning unit comprises a guide column arranged on the frame and a counterweight guide block arranged on the guide column, the extension direction of the guide column forms an angle with the horizontal plane, and the counterweight guide block is connected with a second sprocket, and the second sprocket is connected with at least one of the first transmission chain and the second transmission chain.

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