Low temperature drying furnace

Abstract

This utility model relates to a low-temperature drying oven, the oven body of which includes a frame, a heating unit, a conveying unit, and a drive unit. The drive unit is located at one end of the frame, and the heating unit is located in the middle. The conveying unit runs through the frame and includes a mesh chain and supporting profiles, the surface of which is covered with a nylon protective sleeve. A pin is mounted on the mesh chain, and the distance L1 between the side of the mesh chain and the nylon protective sleeve is less than the distance L2 between the outer edge of the pin and the supporting profile. A drive wheel is added to the tail end of the conveying unit, and a single-sided bolt adjustment structure is provided on both sides of the frame. The nylon protective sleeve prevents the mesh chain from shifting and colliding with the supporting profile, reducing wear, protecting the pins, and extending their lifespan. The single-sided bolt adjustment structure enables smooth steering and position adjustment of the mesh chain, preventing shifting, reducing friction, improving stability and maintenance efficiency, and reducing downtime and costs.

Description

Technical Field

[0001] This utility model relates to the technical field of drying ovens, and in particular to a low-temperature drying oven. Background Technology

[0002] The low-temperature drying oven, specifically designed for solar cell printing lines, employs precise temperature control technology to efficiently and gently cure the functional layers of printed solar cells. The equipment typically includes a hot air circulation system, an insulated enclosure, a heat-resistant conveyor belt, a temperature control system, and a dehumidification device. Its advantages include significantly reducing high-temperature thermal stress, protecting brittle substrates, ensuring uniform drying of the film layer, improving product yield and performance stability, and also featuring low energy consumption.

[0003] The high-temperature resistant conveyor belt adopts a mesh chain structure, with pins on its surface to support silicon wafers. A reversing shaft is installed at the outlet end of the low-temperature drying oven to reverse the direction of the mesh chain conveyor belt. However, current low-temperature drying ovens can reach lengths of up to 17 meters, making the mesh chain prone to deviation during transport. After deviation, the edges of the mesh chain are likely to come into contact with the aluminum profile, causing metal wear and thus affecting the service life of the mesh chain. Utility Model Content

[0004] In view of the shortcomings of the existing technology, one of the objectives of this utility model is to provide a low-temperature drying oven.

[0005] The above-mentioned objective of this utility model is achieved through the following technical solution: a low-temperature drying oven, the oven body includes a frame, a heating unit, a conveying unit and a driving unit, the driving unit is arranged at one end of the frame and the heating unit is arranged in the middle, the conveying unit runs through the entire frame, the conveying unit includes a mesh chain and a supporting profile located on the frame for supporting the mesh chain, the surface of the supporting profile is covered with a nylon protective sleeve; the mesh chain is provided with a pin, and the distance L1 between the side of the mesh chain and the nylon protective sleeve is less than the distance L2 between the outer edge of the pin and the supporting profile.

[0006] By adopting the above technical solution, when the conveyor belt deviates during the conveying process, the side of the conveyor belt will first contact the nylon protective sleeve covering the support profile, rather than directly colliding with the aluminum support profile, thereby avoiding metal wear. At the same time, since the distance L1 between the side of the conveyor belt and the nylon protective sleeve is less than the distance L2 between the outer edge of the ejector pin and the support profile, the outer edge of the ejector pin will not interfere with the support profile during the deviation, ensuring the smooth operation of the conveyor belt and extending the service life of the equipment.

[0007] In a preferred embodiment, the present invention can be further configured such that the nylon protective sleeve and the supporting profile adopt an insertion structure: the bottom surface of the nylon protective sleeve is provided with an insertion block, the top surface of the supporting profile is provided with an insertion groove, and the insertion block is embedded in the insertion groove.

[0008] By adopting the above technical solution, the nylon protective sleeve can be stably fixed to the support profile, preventing it from loosening or falling off due to vibration when the chain is running at high speed or shifting. The plug-in structure design simplifies the installation and maintenance process; operators only need to align the insert block with the insert slot and push it in to complete the fixation, eliminating the need for additional fasteners, thus improving assembly efficiency and reducing maintenance costs. At the same time, this structure ensures a tight fit between the nylon protective sleeve and the support profile, effectively dispersing the impact force when the chain collides with the side, further reducing the risk of wear, thereby enhancing the overall stability and service life of the equipment.

[0009] In a preferred embodiment, the present invention can be further configured such that: a drive wheel is provided at the tail end of the conveying unit, and a single-sided bolt adjustment structure is provided on the tail bearing mounting plate of the frame on both sides of the drive wheel.

[0010] By adopting the above technical solution, when the conveyor belt needs to change direction during the conveying process, the drive wheel can smoothly guide the belt to turn, reducing friction and wear. At the same time, the single-sided bolt adjustment structure allows operators to easily adjust the position of the drive wheel to adapt to different working conditions or compensate for installation errors, ensuring that the conveyor belt is always on the correct track, thereby effectively preventing deviation, improving conveying stability, and further extending the service life of the equipment. In addition, this structural design simplifies the maintenance process, allowing for quick adjustments without disassembling the entire machine, reducing downtime and maintenance costs.

[0011] In a preferred embodiment, this utility model can be further configured as follows: the single-sided bolt adjustment structure includes a bearing mounting plate, a seated bearing, a transmission sprocket, a fixing bolt, a bearing push plate, and a bolt adjustment assembly; the end bearing of the drive wheel passes through the seated bearing, and the transmission sprocket is installed at its extended end; multiple oblong holes are provided on the bearing mounting plate, and the fixing bolt passes through the oblong holes to fix the bearing mounting plate to the tail bearing mounting plate of the frame; a bearing push plate is installed at the end of the seated bearing near the bolt adjustment assembly, and the bolt adjustment assembly drives the seated bearing to move by pushing the bearing push plate.

[0012] By adopting the above technical solution, operators can adjust the components by rotating the bolts, push the bearing push plate, and make the seated bearing slide along the frame direction within the range of the waist-shaped hole, thereby achieving fine adjustment of the drive wheel position. This structural design simplifies the operation process, and can quickly compensate for installation errors or adapt to different working conditions without disassembling the whole machine, ensuring that the mesh chain is always on the correct track, effectively preventing deviation, reducing friction and wear, thereby significantly improving conveying stability, extending equipment service life, and reducing maintenance costs.

[0013] In a preferred embodiment, the present invention can be further configured as follows: the bolt adjustment assembly includes a fixing block, a tightening bolt, a tightening nut, and a limiting pull stud; one side of the fixing block is fixed to the tail bearing mounting plate of the frame, and the other side is provided with a threaded groove for installing the tightening bolt; the bearing push plate has a first groove on one side facing the bolt adjustment assembly and a second groove on the other side, the first groove and the second groove are connected and the cross-sectional area of ​​the first groove is smaller than that of the second groove; the end of the tightening bolt passes through the through groove of the tightening nut and the fixing block in sequence, and its tail end is connected to the limiting pull stud located in the first groove; when the tightening bolt is tightened, the limiting pull stud pushes the bearing push plate, thereby driving the seated bearing to move.

[0014] By adopting the above technical solution, operators only need to rotate the tightening bolt and adjust the preload using the tightening nut, so that the limiting pull pin can firmly push the bearing push plate in the first slot, achieving precise sliding of the seated bearing along the direction of the oblong hole. This structure is compact and intuitive to operate, and can quickly compensate for installation deviations or adapt to different mesh chain tensions without additional tools, ensuring that the position of the drive wheel is precise and controllable, effectively avoiding mesh chain deviation, reducing friction loss, thereby further improving conveying stability, extending equipment service life, and reducing daily maintenance frequency and costs.

[0015] In a preferred embodiment, the present invention can be further configured such that: the limiting rivet is composed of a first limiting part, a neck and a second limiting part connected in sequence, the first limiting part is located outside the first groove, the neck is placed inside the first groove, and the second limiting part is located inside the second groove; the first limiting part is connected to the tightening bolt.

[0016] By adopting the above technical solution, the three-section structure of the limiting pull stud can accurately limit its movement range in the slot. The first limiting part effectively prevents the limiting pull stud from coming out of the first slot, and the neck provides sliding space in the slot. The second limiting part forms a stable support point in the second slot. At the same time, the threaded design ensures a firm connection between the limiting pull stud and the tightening bolt. This configuration makes the limiting pull stud bear force evenly during the pushing process, avoiding loosening caused by vibration or impact, thereby improving the response accuracy and reliability of the bearing push plate, further enhancing the stability of the bearing position adjustment, reducing the risk of the mesh chain running off-center, reducing frictional loss, and extending the overall service life of the equipment.

[0017] In a preferred embodiment, the present invention can be further configured such that: limiting pressure plates are added to the upper and lower sides of the bearing mounting plate, and the bearing mounting plate moves left and right along the direction of the limiting pressure plates.

[0018] By adopting the above technical solution, the added limiting pressure plate provides a stable guiding path for the seated bearing, enabling the seated bearing to move accurately and smoothly left and right along the guide rail direction. This design effectively improves the flexibility and controllability of position adjustment, reduces the deviation or jamming of the seated bearing during operation, thereby significantly reducing the risk of the mesh chain running off track, ensuring the stability of the mesh chain running trajectory, further optimizing the transmission efficiency of the drying oven, reducing friction loss, and extending the service life of key components of the equipment.

[0019] In summary, this utility model has at least one of the following beneficial technical effects:

[0020] 1. The nylon protective sleeve effectively prevents the mesh chain from directly colliding with the aluminum support profile when it shifts, significantly reducing metal wear, protecting the ejector pin, and extending the overall service life of the equipment.

[0021] 2. The nylon protective sleeve is fixed by a plug-in structure, which simplifies the installation and maintenance process, improves assembly efficiency and reduces maintenance costs, while ensuring that the nylon protective sleeve fits tightly with the supporting profile, disperses impact force and enhances equipment stability.

[0022] 3. The addition of a drive wheel and a single-sided bolt adjustment structure enables smooth steering and convenient position adjustment of the mesh chain, preventing deviation, reducing friction, improving conveying stability, and supporting rapid maintenance, thereby reducing downtime and operating costs.

[0023] 4. Optimize the design of the bolt adjustment assembly, including the three-section structure of the limit rivet, to ensure accurate and reliable response of the bearing push plate, avoid loosening, further improve the stability of position adjustment, and reduce the risk of chain deviation and friction loss.

[0024] 5. Adding a limit plate to guide the movement of the belt bearing improves the accuracy and controllability of position adjustment, effectively reduces offset or jamming, optimizes transmission efficiency, and extends the life of key components. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a low-temperature drying oven.

[0026] Figure 2 This is a partial schematic diagram of the conveyor unit, used to show the nylon protective sleeve.

[0027] Figure 3 This is a partial schematic diagram of the conveyor unit, used to show the mesh chain and ejector pins.

[0028] Figure 4 This is a schematic diagram of a single-sided bearing bolt adjustment structure.

[0029] Figure 5 yes Figure 4The enlarged view in section A shows the structure and position of the limiting rivet.

[0030] In the diagram, 1. Frame; 11. Support profile; 111. Insertion slot; 12. Nylon protective sleeve; 121. Insertion block; 13. Tail bearing mounting plate; 2. Heating unit; 3. Conveying unit; 31. Mesh chain; 311. Ejector pin; 32. Drive wheel; 4. Drive unit; 5. Single-sided bearing bolt adjustment structure; 51. Bearing with seat; 52. Transmission sprocket; 53. Bearing push plate; 531. First slot; 532. Second slot; 54. Bolt adjustment assembly; 541. Fixing block; 542. Tightening bolt; 543. Tightening nut; 544. Limiting rivet; 5441. First limiting part; 5442. Neck; 5443. Second limiting part; 55. Limiting pressure plate; 56. Fixing bolt; 57. Bearing mounting plate. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Reference Figure 1 This utility model discloses a low-temperature drying oven suitable for photovoltaic printing lines. Its oven structure mainly consists of a frame 1, a heating unit 2, a conveying unit 3, and a drive unit 4. The drive unit 4 is located at one end of the frame 1 and is responsible for providing driving force to the entire system; the heating unit 2 is located in the middle area of ​​the frame 1 to ensure concentrated heat supply; the conveying unit 3 runs through the entire length of the frame 1 and is responsible for the stable transport of silicon wafers.

[0033] Reference Figure 2-3 The core of the conveying unit 3 includes a mesh chain 31 and a support profile 11. The support profile 11 is fixed to the main frame of the frame 1 by welding or bolting and is specifically designed to support the mesh chain 31. The surface of the support profile 11 that contacts the mesh chain 31 is covered with a wear-resistant nylon protective sleeve 12 to reduce friction loss. Pins 311 for supporting silicon wafers are regularly distributed on the working surface of the mesh chain 31. The horizontal distance L1 between the side edge of the mesh chain 31 and the outer edge of the nylon protective sleeve 12 is smaller than the horizontal distance L2 between the outermost edge of the pin 311 and the vertical sidewall of the support profile 11 below. This design effectively prevents operational interference. The nylon protective sleeve 12 and the supporting profile 11 below adopt a plug-in mating structure to achieve a reliable connection: the bottom surface of the nylon protective sleeve 12 is molded with continuous insertion blocks 121 along the length direction, and correspondingly, the top surface of the supporting profile 11 is machined with continuous insertion grooves 111. During installation, the insertion blocks 121 of the protective sleeve are precisely embedded into the grooves of the supporting profile 11, thereby achieving a firm fixation between the two.

[0034] Reference Figure 4-5At the tail end of the conveying unit 3, there is a drive wheel 32 for changing the conveying direction. To ensure that the parallelism and tension of the rollers are adjustable, an independent single-sided bolt adjustment structure is provided on the tail bearing mounting plate 13 of the frame 1 on both sides of the rollers.

[0035] The single-sided bolt adjustment structure specifically includes a bearing mounting plate 57, a seated bearing 51, a drive sprocket 52, a fixing bolt 56, a bearing push plate 53, and a bolt adjustment assembly 54. The end bearing of the drive wheel 32 is precisely installed and passes through the center hole of the seated bearing 51. Its extended end is fixedly mounted with the drive sprocket 52 by a lock nut. The drive sprocket 52 is fixed by a flat key and its end is protected by a sprocket cover plate. The main body of the bearing mounting plate 57 is engaged with a pre-set oblong hole on the frame 1 by fixing bolts to achieve initial fixed positioning and allow for a certain range of adjustment. A bearing push plate 53 is rigidly connected to one end of the bearing mounting plate 57 near the bolt adjustment assembly 54. This can be fixed by welding or bolting, and pushing the bearing push plate 53 drives the seated bearing 51 to produce the required axial displacement.

[0036] The bolt adjustment assembly 54 further includes a fixing block 541, a tightening bolt 542, a tightening nut 543, and a limiting pull pin 544. One side of the fixing block 541 is firmly fixed to the tail bearing mounting plate 13 of the frame 1, and the other side has a threaded groove for assembling the adjusting bolt 542. The bearing push plate 53 has a first slot 531 with a smaller cross-sectional area and a second slot 532 with a larger cross-sectional area, which are interconnected on the side facing the bolt adjustment assembly 54. The tightening bolt 542 passes sequentially through the threaded grooves of the tightening nut 543 and the fixing block 541, and its end is threadedly fixed to the limiting pull pin 544 located inside the first slot 531. When the adjusting bolt 542 is tightened, the limiting pull pin 544 moves axially with the bolt 542 and pushes the bearing push plate 53, thereby driving the entire mounted bearing 51 to move along the adjustment direction.

[0037] The specially designed limiting rivet 544 consists of three parts: a first limiting part 5441 located outside the first slot 531, a cylindrical neck 5442 placed inside the first slot 531, and a second limiting part 5443 located inside the second slot 532. The diameter of the first limiting part 5441 is larger than the width of the first slot 531, the diameter of the neck 5442 matches the diameter of the first slot 531, and the diameter of the second limiting part 5443 is larger than the neck 5442 but smaller than the width of the second slot 532. Furthermore, the first limiting part 5441 located outside the first slot 531 is connected to the end of the adjusting bolt 542, for example, through abutment, rotational connection, or welding.

[0038] To ensure that the bearing 51 moves smoothly and without deviation, limit plates 55 are added to the upper and lower sides of the bearing 51, so that it can move linearly left and right along the guide rail fixed on the frame 1.

[0039] The implementation principle of this embodiment is as follows: the drive unit 4 drives the conveyor chain 31 of the conveyor unit 3 to rotate cyclically. The ejector pins 311 carrying the silicon wafers move with the conveyor chain 31, smoothly conveying the silicon wafers through the area where the heating unit 2 is located for low-temperature drying. During operation, the horizontal distance L1 between the side edge of the conveyor chain 31 and the outer edge of the nylon protective sleeve 12 is always less than the horizontal distance L2 between the outermost edge of the ejector pin 311 and the vertical sidewall of the lower support profile 11. This dimensional relationship avoids collisions or friction between the ejector pins 311 and the sidewall of the support profile 11 when the conveyor chain 31 moves, ensuring interference-free operation. The nylon protective sleeve 12 is engaged with the continuous insertion slot 111 on the top surface of the support profile 11 through the continuous insertion block 121 at its bottom. This not only achieves a reliable connection between the two, but its wear-resistant properties also significantly reduce frictional loss between the conveyor chain 31 and the support profile 11, extending the service life of the components. When it is necessary to adjust the offset direction of the conveyor chain 31, it can be adjusted by adjusting the parallelism or tension of the drive wheel 32. The operator can rotate the tightening bolt 542 of the bolt adjustment assembly 54 on a specific side. The rotation of the tightening bolt 542 causes the limiting pull pin 544, which is threaded to its end, to move axially. Since the cylindrical neck 5442 of the limiting pull pin 544 is precisely located in the first slot 531 of the bearing push plate 53, and the diameter of the first limiting part 5441 of the limiting pull pin 544 is larger than the width of the first slot 531, and the second limiting part 5443 is located in the second slot 532, the axial movement of the limiting pull pin 544 directly pushes the bearing push plate 53, thereby driving the rigidly connected bearing 51 to produce a clear linear displacement along the guide direction of the upper and lower limiting pressure plates 55. This displacement changes the position of the bearing at the end of the drive wheel 32 on a specific side, thereby achieving the adjustment of the parallelism of the roller and the tension of the mesh chain 31: since the friction coefficient of the mesh chain 31 on the tensioned side is high and the friction coefficient on the other side is low, the mesh chain 31 is guided to adjust towards the tensioned side, thereby achieving the purpose of adjusting the offset of the mesh chain 31. This single-sided adjustment structure design ensures convenient and accurate adjustment, making the operation of the conveying unit 3 more stable and reliable.

[0040] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A low-temperature drying oven, the oven body comprising a frame (1), a heating unit (2), a conveying unit (3), and a driving unit (4), wherein the driving unit (4) is disposed at one end of the frame (1), the heating unit (2) is disposed in the middle, and the conveying unit (3) penetrates the entire frame (1), characterized in that: The conveying unit (3) includes a mesh chain (31) and a support profile (11) located on the frame (1) for supporting the mesh chain (31). The surface of the support profile (11) is covered with a nylon protective sleeve (12). The mesh chain (31) is provided with a pin (311), and the distance L1 between the side of the mesh chain (31) and the nylon protective sleeve (12) is less than the distance L2 between the outer edge of the pin (311) and the support profile (11).

2. The low-temperature drying oven according to claim 1, characterized in that... The nylon protective sleeve (12) and the supporting profile (11) adopt a plug-in structure: the bottom surface of the nylon protective sleeve (12) is provided with an insertion block (121), and the top surface of the supporting profile (11) is provided with an insertion groove (111), and the insertion block (121) is embedded in the insertion groove (111).

3. The low-temperature drying oven according to claim 2, characterized in that... The conveying unit (3) is equipped with a drive wheel (32) at its tail end, and a single-sided bolt adjustment structure (5) is configured on the tail bearing mounting plate (13) of the frame (1) on both sides of the drive wheel (32).

4. The low-temperature drying oven according to claim 3, characterized in that... The single-sided bolt adjustment structure (5) includes a bearing mounting plate (57), a seated bearing (51), a transmission sprocket (52), a fixing bolt (56), a bearing push plate (53), and a bolt adjustment assembly (54). The end bearing of the drive wheel (32) passes through the seated bearing (51), and the transmission sprocket (52) is installed on its extended end. The bearing mounting plate (57) has multiple oblong holes, and the fixing bolt (56) passes through the oblong holes to fix the bearing mounting plate (57) to the tail bearing mounting plate (13) of the frame (1). The seated bearing (51) has a bearing push plate (53) installed at one end near the bolt adjustment assembly (54), and the bolt adjustment assembly (54) drives the seated bearing (51) to move by pushing the bearing push plate (53).

5. The low-temperature drying oven according to claim 4, characterized in that... The bolt adjustment assembly (54) includes a fixing block (541), a tightening bolt (542), a tightening nut (543), and a limiting rivet (544). One side of the fixing block (541) is fixed to the tail bearing mounting plate (13) of the frame (1), and the other side has a threaded groove for installing the tightening bolt (542). The bearing push plate (53) has a first slot (531) on one side facing the bolt adjustment assembly (54), and a second slot (532) on the other side. A slot (531) is connected to a second slot (532), and the cross-sectional area of ​​the first slot (531) is smaller than that of the second slot (532). The end of the tightening bolt (542) passes through the through slots of the tightening nut (543) and the fixing block (541) in sequence, and its tail end is connected to the limiting pull stud (544) located in the first slot (531). When the tightening bolt (542) is tightened, the limiting pull stud (544) pushes the bearing push plate (53), thereby driving the seated bearing (51) to move.

6. The low-temperature drying oven according to claim 5, characterized in that... The limiting rivet (544) is composed of a first limiting part (5441), a neck (5442) and a second limiting part (5443) connected in sequence. The first limiting part (5441) is located outside the first groove (531), the neck (5442) is placed inside the first groove (531), and the second limiting part (5443) is located inside the second groove (532). The first limiting part (5441) is connected to the tightening bolt (542).

7. The low-temperature drying oven according to claim 4, characterized in that... Limiting pressure plates (55) are added to the upper and lower sides of the bearing mounting plate (57), and the bearing mounting plate (57) moves left and right along the direction of the limiting pressure plates (55).

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