Multi-layer tunnel type annealing furnace

Abstract

The utility model relates to a multi-layer tunnel type annealing furnace which comprises a first lifting section, an annealing section and a second lifting section which are connected in sequence, a plurality of conveying lines are arranged in the annealing section up and down, each conveying line comprises two rolling shafts, two tensioning shafts and a grid conveying belt, the two rolling shafts and the two tensioning shafts are arranged in parallel, the grid conveying belt is wound on the two rolling shafts, and the first lifting section and the second lifting section are arranged in parallel. The tensioning shaft upwards presses the lower section of the grid conveying belt, so that the upper section of the grid conveying belt is tightened; a plurality of heating pipes are arranged on the upper portion of the annealing section side by side at equal intervals in the conveying direction of the conveying line, an exhaust fan is arranged in the center of the lower portion of the annealing section, an air flue for conveying air to the positions above the heating pipes from the exhaust fan is arranged on the side of the annealing section, an air filtering assembly is arranged between an upper outlet of the air flue and the heating pipes, and a heating mechanism is further arranged in the air flue. The multi-layer tunnel type annealing furnace can convey a plurality of substrates at the same time, is high in processing efficiency, can reduce energy consumption on the premise of effectively ensuring the temperature consistency of annealing sections, and is low in failure rate.

Description

Technical Field

[0001] The utility model relates to the technical field of baking furnaces, in particular to a multi-layer tunnel annealing furnace. Background Art

[0002] With the development of the photovoltaic industry, perovskite has become an important direction for the next generation of photovoltaic cell technology due to its extremely high conversion efficiency and cost reduction potential. The annealing process is a crucial link in the production of perovskite. This process heats and controls the temperature to grow grains, remove some impurities and defects, and improve the photoelectric conversion efficiency of the cell. Annealing uses annealing furnace equipment. Currently, common annealing equipment is generally flat-plate heating annealing furnace and conventional tunnel annealing furnace.

[0003] The flat-plate heating annealing furnace adopts a multi-layer structure, which has limited production capacity; compatibility with automated assembly lines requires the use of a robotic arm, which is relatively costly; each layer of the multi-layer structure has a separate heating plate, which consumes relatively much energy.

[0004] Conventional tunnel annealing furnaces use an assembly line process, and heating is generally performed by infrared lamp heating. To ensure temperature uniformity, the substrate requires a relatively high conveying speed. To ensure sufficient annealing time for the substrate, the annealing furnace heating unit needs to be designed to be relatively long, resulting in a relatively large footprint and strict requirements on the factory site.

[0005] Chinese patent CN 203399643U discloses a multi-layer tunnel food oven, including three layers of oven channels, each with a lifting frame at the entrance and exit to change the height of the baking object, which saves space. The oven is for food, not annealing. For each oven channel, electric heating pipes are set up above and below, with multiple heating positions and a high failure rate.

[0006] Therefore, it is necessary to design a new annealing furnace structure to solve the above problems. Utility Model Content

[0007] The main purpose of the utility model is to provide a multi-layer tunnel annealing furnace, which can transport multiple substrates in parallel, has high processing efficiency, can reduce energy consumption while effectively ensuring the temperature consistency of the annealing section, improve energy utilization efficiency, and has a low failure rate.

[0008] The utility model achieves the above-mentioned purpose through the following technical scheme: a multi-layer tunnel annealing furnace, comprising a first lifting section, an annealing section and a second lifting section connected in sequence, wherein a plurality of conveying lines are arranged in the annealing section from top to bottom, wherein the conveying line comprises two rollers, two tensioning shafts and a mesh conveyor belt, wherein the two rollers and the two tensioning shafts are arranged in parallel, wherein the mesh conveyor belt is wound around the two rollers, and the tensioning shaft presses the lower section of the mesh conveyor belt upward so as to tighten the upper section of the mesh conveyor belt; a plurality of heating tubes are arranged side by side at equal distances along the conveying direction of the conveyor line at the upper part of the annealing section, an exhaust fan is arranged at the lower center of the annealing section, an air duct for delivering air from the exhaust fan to the top of the heating tube is arranged on the side of the annealing section, an air filter assembly is arranged between the upper outlet of the air duct and the heating tube, and a heating mechanism is also arranged in the air duct.

[0009] Specifically, the annealing section includes a box body and a top cover, the box body and the top cover are assembled to form the air duct, the contact position between the box body and the top cover is sealed by a seal, and the air filter assembly is detachably installed in the top cover.

[0010] Furthermore, one side of the top cover is rotatably connected to the box body through a hinge, and the other side of the box body is provided with a cylinder for lifting and pulling down the other side of the top cover.

[0011] Furthermore, an organic exhaust duct is provided on the upper portion of the top cover.

[0012] Specifically, the inner surface of the grid conveyor belt is provided with two inner pads parallel to each other, the two inner pads are located on both sides of the conveying direction and are used to support the edge of the roller; the outer surface of the grid conveyor belt is provided with two outer pads parallel to each other, the two outer pads are located on both sides of the conveying direction and are used to limit both sides of the substrate.

[0013] Specifically, the first lifting section and the second lifting section both include a supporting platform, a lifting platform located above the supporting platform, a lifting mechanism fixed on the supporting platform and driving the lifting platform to rise and fall, and a plurality of conveying rollers arranged at the same height on the lifting platform.

[0014] The beneficial effects of the technical solution of the utility model are:

[0015] 1. This multi-layer tunnel annealing furnace has multiple layers of conveyor lines, which greatly shortens the length of the annealing section required to process the same number of substrates, reduces the floor space of the annealing furnace, and improves the space utilization rate of the workshop;

[0016] 2. The upper and lower layers are heated by the same set of heating tubes, and the air duct is used for hot air circulation. The conveyor line adopts a network conveyor belt with low resistance, which can reduce energy consumption and improve energy utilization efficiency while effectively ensuring the temperature consistency of the annealing section. There are fewer heating tubes and a low failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal structure of a multi-layer tunnel annealing furnace in an embodiment;

[0018] Figure 2 It is a cross-sectional view of the annealing section along the vertical plane of the conveying direction;

[0019] Figure 3 It is a top view of the conveyor line;

[0020] Figure 4 It is a cross-sectional view of the grid conveyor belt along the vertical plane of the conveying direction when conveying the substrate.

[0021] The markings in the figure are:

[0022] 1-Multi-layer tunnel annealing furnace,

[0023] 11a-first lifting section, 11b-second lifting section, 111-support platform, 112-lifting mechanism, 113-lifting platform, 114-conveying roller,

[0024] 12-annealing section, 121-box, 1211-heating tube, 1212-exhaust fan, 1213-cylinder, 122-top cover, 1221-air filter assembly, 1222-organic exhaust pipe, 123-hinge, 124-seal, 125-air duct, 1251-heating mechanism,

[0025] 13- conveyor line, 131- roller, 132- tensioning shaft, 133- grid conveyor belt, 1331- inner pad, 1332- outer pad;

[0026] 2-Substrate. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below in conjunction with specific embodiments.

[0028] Example:

[0029] like Figure 1 As shown, a multi-layer tunnel annealing furnace 1 of the present invention comprises a first lifting section 11a, an annealing section 12 and a second lifting section 11b connected in sequence.

[0030] like Figure 1As shown, the first lifting section 11a and the second lifting section 11b both include a supporting platform 111, a lifting platform 113 located above the supporting platform 111, a lifting mechanism 112 fixed on the supporting platform 111 and driving the lifting platform 113 to rise and fall, and a plurality of conveying rollers 114 arranged at the same height on the lifting platform 113.

[0031] The conveying rollers 114 are used to move the substrate 2 in or out along the same conveying direction. When the substrate 2 stops on the lifting platform 113, the lifting mechanism 112 adjusts the height of the lifting platform 113 so as to align with a certain conveying line 13. The first lifting section 11a can bring the substrate 2 to the entrance of one of the conveying lines 13, and then anneal it in the annealing section 12, and finally the second lifting section 11b sends the substrates 2 at different heights to the same discharge line at the same height for removal.

[0032] like Figure 1 and Figure 2 As shown, a plurality of conveyor lines 13 are arranged in the annealing section 12 from top to bottom, and the conveyor line 13 includes two rollers 131, two tensioning shafts 132 and a mesh conveyor belt 133. The two rollers 131 and the two tensioning shafts 132 are arranged in parallel, and the mesh conveyor belt 133 is wound around the two rollers 131. The tensioning shaft 132 presses the lower section of the mesh conveyor belt 133 upward so that the upper section of the mesh conveyor belt 133 is tightened; a plurality of heating tubes 1211 are arranged equidistantly and side by side along the conveying direction of the conveyor line 13 at the upper part of the annealing section 12, an exhaust fan 1212 is arranged at the lower center of the annealing section 12, and an air duct 125 for conveying air from the exhaust fan 1212 to the top of the heating tube 1211 is arranged on the side of the annealing section 12, and an air filter assembly 1221 is arranged between the upper outlet of the air duct 125 and the heating tube 1211, and a heating mechanism 1251 is also arranged in the air duct 125.

[0033] When the substrate 12 passes through the annealing section 12, on the one hand, it is heated by the heating tube 1211, and on the other hand, the hot air generates an internal circulation under the action of the exhaust fan 1212, and the heating mechanism 1251 will supplement the heat of the circulating hot air. During the hot air circulation process, it will be filtered through the air filter component 1221 to prevent some particles from being blown onto the substrate 2 and causing product contamination. The multi-layer tunnel annealing furnace 1 has a plurality of upper and lower layers of conveyor lines 13, and the length of the annealing section 12 required to process the same number of substrates 2 is greatly shortened, which reduces the floor space of the annealing furnace and improves the space utilization rate of the workshop. The upper and lower layers are heated by the same set of heating tubes 1211, and the air duct 125 is used for hot air circulation. The conveyor line 13 uses a network conveyor belt 133 with low resistance, which can reduce energy consumption and improve energy utilization efficiency while effectively ensuring the temperature consistency of the annealing section. There are fewer heating tubes and a low failure rate.

[0034] like Figure 2As shown, the annealing section 12 includes a box body 121 and a top cover 122. The box body 121 and the top cover 122 are assembled to form an air duct 125. The contact position between the box body 121 and the top cover 122 is sealed by a seal 124. The air filter assembly 1221 is detachably installed in the top cover 122. One side of the top cover 122 is rotatably connected to the box body 121 through a hinge 123, and the other side of the box body 121 is provided with a cylinder 1213 for lifting and pulling down the other side of the top cover 122.

[0035] The box body 121 and the top cover 122 are assembled into a closed space, and the joint is sealed by a seal 124, and hot air circulates in the closed space. The hinge 123 allows the top cover 122 to be rotated and opened, and the cylinder 1213 can drive the top cover 122 to open, which can reduce the labor of manual opening.

[0036] like Figure 1 and Figure 2 As shown, an organic exhaust duct 1222 is provided on the upper portion of the top cover 122 .

[0037] There may be some organic matter in the gas evaporated from the substrate 2 . These organic matter are easily decomposed into some impurities when heated, so they need to be discharged from the organic exhaust pipe 1222 in time.

[0038] like Figure 3 and Figure 4 As shown, the inner surface of the grid conveyor belt 133 is provided with two inner pads 1331 parallel to each other, the two inner pads 1331 are located on both sides of the conveying direction and are used to support the edge of the roller 131; the outer surface of the grid conveyor belt 133 is provided with two outer pads 1332 parallel to each other, the two outer pads 1332 are located on both sides of the conveying direction and are used to limit both sides of the substrate 2.

[0039] The grid conveyor line 133 relies on two inner pads 1331 to maintain an axial position relationship with the roller 131, and then relies on two outer pads 1332 to maintain the axial position relationship with the substrate 2, so that the substrate 2 moves forward in the middle of the conveyor line 12 to prevent the substrate 2 from deviating from the conveying direction and falling.

[0040] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A multi-layer tunnel annealing furnace, comprising a first lifting section, an annealing section and a second lifting section connected in sequence, characterized in that: A plurality of conveyor lines are arranged in the upper and lower parts of the annealing section, and the conveyor lines include two rollers, two tensioning shafts and a mesh conveyor belt. The two rollers and the two tensioning shafts are arranged in parallel, and the mesh conveyor belt is wound around the two rollers. The tensioning shaft presses the lower section of the mesh conveyor belt upward so that the upper section of the mesh conveyor belt is tightened; a plurality of heating tubes are arranged side by side at equal distances along the conveying direction of the conveyor line at the upper part of the annealing section, an exhaust fan is arranged at the lower center of the annealing section, and an air duct is arranged on the side of the annealing section to deliver air from the exhaust fan to the top of the heating tube, an air filter assembly is arranged between the upper outlet of the air duct and the heating tube, and a heating mechanism is also arranged in the air duct.

2. The multi-layer tunnel annealing furnace according to claim 1, characterized in that: The annealing section comprises a box body and a top cover, wherein the box body and the top cover are assembled to form the air duct, the contact position between the box body and the top cover is sealed by a sealing member, and the air filter assembly is detachably installed in the top cover.

3. The multi-layer tunnel annealing furnace according to claim 2, characterized in that: One side of the top cover is rotatably connected to the box body through a hinge, and the other side of the box body is provided with a cylinder for lifting and pulling down the other side of the top cover.

4. The multi-layer tunnel annealing furnace according to claim 3, characterized in that: An organic exhaust pipe is arranged on the upper part of the top cover.

5. The multi-layer tunnel annealing furnace according to claim 1, characterized in that: The inner surface of the grid conveyor belt is provided with two inner pads parallel to each other, the two inner pads are located on both sides of the conveying direction and are used to support the edge of the roller; the outer surface of the grid conveyor belt is provided with two outer pads parallel to each other, the two outer pads are located on both sides of the conveying direction and are used to limit both sides of the substrate.

6. The multi-layer tunnel annealing furnace according to claim 1, characterized in that: The first lifting section and the second lifting section both include a supporting platform, a lifting platform located above the supporting platform, a lifting mechanism fixed on the supporting platform and driving the lifting platform to move up and down, and a plurality of conveying rollers arranged at the same height on the lifting platform.

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