Multi-section type transmission curing oven

Abstract

The utility model discloses a multi-section type transmission curing oven which comprises an oven body, a transmission mechanism and a gate mechanism, one end of the oven body is a product inlet, and the other end of the oven body is a product outlet. The furnace body is sequentially provided with at least three partition areas in the product conveying direction, and all the partition areas jointly form a product channel communicating with the product inlet and the product outlet. The conveying mechanism comprises conveying assemblies which are arranged in the partition areas in a one-to-one correspondence mode and can operate independently. The conveying assemblies are used for conveying products in the product channels. The gate mechanism comprises an inlet gate, an outlet gate and middle gates which can be independently opened and closed to partition or communicate the product channel, the inlet gate and the outlet gate are located at the product inlet and the product outlet respectively, and the middle gates are arranged between every two adjacent partition areas in a one-to-one correspondence mode. According to the utility model, the loss phenomenon of inert gas and heat in the furnace body can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cell production, in particular to a multi-stage transmission curing furnace. Background Art

[0002] In HJT cell manufacturing, drying and curing furnaces are often used to dry and cure solar cells. In some special processes, in order to avoid surface passivation caused by surface oxidation of the cell, the heating and curing of the cell must be carried out in an inert gas environment. The process chamber of existing equipment is equipped with multiple temperature zones, which are connected by a transmission mechanism. During the process of transporting the cell by the transmission mechanism, multiple temperature zones are in an open state, which leads to the risk of a large amount of inert gas loss in the process chamber. Due to the open temperature zones, the heat in the temperature zones will also be lost. Utility Model Content

[0003] In order to overcome the above-mentioned shortcomings, the purpose of the present invention is to provide a multi-stage transmission curing furnace, which can effectively reduce the loss of inert gas and heat in the process chamber.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is: a multi-stage transmission curing furnace, comprising

[0005] A furnace body, one end of which is a product inlet and the other end of which is a product outlet; the furnace body is provided with at least three partitions in sequence along the product transmission direction, all of which together form a product channel connecting the product inlet and the product outlet;

[0006] A conveying mechanism, the conveying mechanism including conveying components arranged in a one-to-one correspondence in the partition area and capable of operating independently, the conveying components being used to convey products in the product channel;

[0007] A gate mechanism, comprising an entrance gate, an exit gate, and an intermediate gate that can be independently opened and closed to isolate or connect the product channel, the entrance gate and the exit gate being located at the product entrance and the product exit, respectively, and the intermediate gate being disposed between two adjacent separation zones in a one-to-one correspondence;

[0008] At least one of the entrance gate and the exit gate is in a closed state, and when the exit gate is in an open state, the intermediate gate closest to the exit gate is in a closed state; when the entrance gate is in an open state, the intermediate gate closest to the entrance gate is in a closed state.

[0009] The beneficial effects of the multi-stage transmission curing furnace of the utility model are:

[0010] In the transmission mechanism, the transmission components corresponding to the partition areas are arranged to ensure the independent transmission of products in a single partition area, so as to avoid the influence of the transmission of other partition areas on the transmission of products in any partition area; the gate mechanism is arranged to segmentally open and close the multiple partition areas of the furnace body, so as to avoid the large loss of gas and heat in the product channel caused by the simultaneous opening of multiple partition areas; at least one of the inlet gate and the outlet gate is arranged in a closed state, and when the inlet gate (or the outlet gate) is opened, the intermediate gate closest to the inlet gate (or the outlet gate) is closed, so that the product channel between the outlet gate (or the inlet gate) in the closed state and the intermediate gate closest to the inlet gate (or the outlet gate) is closed, thereby effectively avoiding the large loss of inert gas and heat in the product channel.

[0011] Further, the inlet gate, outlet gate and intermediate gate each include a door plate, a guide column and a lifting drive, the guide column is installed on the top of the furnace body, and the door plate penetrates the top of the furnace body in the vertical direction and can move up and down along the guide column under the action of the lifting drive. The movement direction of the door plate can be guided by the guide column, so that the door plate can perform up-down opening and closing action in the vertical direction.

[0012] Further, the top of the furnace body is further provided with detection members corresponding to the inlet gate, outlet gate and intermediate gate, and the upper end of the door plate is provided with a position detection piece for detection by the detection members; when the detection members detect the position detection piece, the door plate is in a closed state. When the detection members detect the position detection piece, the lifting drive stops running, and the door plate stops moving and remains in the closed state.

[0013] Further, the upper end of the guide column is provided with a stop block for abutting against the door plate. The up-moving position of the door plate can be limited by the stop block.

[0014] Further, the junctions of two adjacent partition areas are each provided with a side baffle arranged on the two inner side walls of the furnace body, and when the door plate between the two partition areas is in a closed state, the side baffle and the door plate can be partially projected and overlapped in the product transmission direction.

[0015] This arrangement is because there is a gap between the door plate and the inner side wall of the furnace body during the lifting of the door plate, and when the door plate is in a closed state, inert gas may escape from the gap between the door plate and the inner side wall of the furnace body, at which time the escape of inert gas can be stopped by the side baffle to slow down the escape speed of inert gas.

[0016] Further, five separation zones are sequentially arranged on the furnace body, and along the product transmission direction, the five separation zones are in sequence an isolation zone, a preheating waiting zone, a constant temperature zone, a heat preservation isolation zone and a cooling zone; the top of the isolation zone is provided with a waste discharge port communicated with the product channel.

[0017] Further, the preheating waiting zone and the constant temperature zone are both provided with a heating module for heating the product channel, and the heating module is a single cycle heating module or a double cycle heating module. Through the arrangement of the heating module, the product in the product channel can be heated and dried.

[0018] Further, the furnace body comprises a pair of counterflow panels arranged oppositely, the top of the pair of counterflow panels is commonly provided with a top cover, and the bottom of the pair of counterflow panels is commonly provided with the product channel; and one end of the counterflow panel close to the product inlet is provided with an air curtain machine. Through the arrangement of the air curtain machine, the environment in the product channel can be distinguished from the external environment, which is beneficial to the introduction of inert gas into the product channel.

[0019] Further, the transmission mechanism is further provided below the dust collection mechanism mounted on the furnace body. The dust collection mechanism comprises a dust box with an open upper end, the dust box extends along the product transmission direction, and the width of the dust box is greater than the width of the transmission mechanism. Through the arrangement of the dust collection mechanism, the dust falling off the conveying mechanism can be collected to reduce the risk of contamination of the battery piece.

[0020] Further, the furnace body is provided below with a carrier backflow mechanism, and a carrier lifting mechanism is arranged between the transmission mechanism close to the product inlet and the carrier backflow mechanism. Generally, the product is placed on the carrier for transmission, when the carrier with the product is transmitted to the product outlet, the product enters the next process, and the carrier can be backflowed to the product inlet through the carrier backflow mechanism, and then the carrier on the carrier backflow mechanism is lifted to the transmission mechanism through the carrier lifting mechanism, so as to load the next product. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structure schematic view of the multi-section type transmission solidification furnace of the utility model embodiment;

[0022] Figure 2 It is a structure schematic view of the multi-section type transmission solidification furnace of the utility model embodiment; Figure 1 It is a local enlarged view of A part in the middle;

[0023] Figure 3 It is a three-dimensional structure schematic view of the furnace body of the utility model embodiment;

[0024] Figure 4 It is a local enlarged view of B part in the middle; Figure 3

[0025] ​ Figure 5 For Figure 3 Local enlarged view of middle C part.

[0026] In the figure:

[0027] 1 - furnace body; 11 - separation zone; 111 - isolation zone; 1111 - exhaust port; 112 - preheating waiting zone; 113 - constant temperature zone; 114 - heat preservation isolation zone; 115 - cooling zone; 12 - side baffle; 13 - top cover;

[0028] 2 - transmission mechanism; 21 - transmission assembly; 211 - transmission frame; 212 - driving roller; 213 - bearing plate;

[0029] 31 - inlet gate; 311 - door plate; 312 - guide column; 313 - in-place detection sheet; 32 - intermediate gate;

[0030] 41 - heating cavity; 42 - circulating fan;

[0031] 5 - air curtain machine;

[0032] 6 - carrier backflow mechanism;

[0033] 7 - dust collection mechanism;

[0034] 8 - connecting roller group. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present application are described in detail below with reference to the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the protection scope of the present application is more clearly defined.

[0036] Embodiment

[0037] Referring to the accompanying drawings, Figure 1-3As shown, the present invention is a multi-stage transmission curing furnace, comprising a furnace body 1, a transmission mechanism 2, and a gate mechanism. One end of the furnace body 1 is a product inlet, and the other end is a product outlet. The furnace body 1 is provided with at least three partitions 11 in sequence along the product transmission direction, and all of the partitions 11 together form a product channel connecting the product inlet and the product outlet. The transmission mechanism 2 includes transmission assemblies 21, which are arranged one-to-one within the partitions 11 and can operate independently. The transmission assemblies 21 are used to transport products within the product channel. The gate mechanism includes an entrance gate 31, an exit gate (not shown), and an intermediate gate 32, which can be opened and closed independently to separate or connect the product channel. The entrance gate 31 and the exit gate are located at the product inlet and the product outlet, respectively, and the intermediate gate 32 is arranged one-to-one between two adjacent partitions 11. At least one of the entrance gate 31 and the exit gate is in a closed state, and when the exit gate 32 is in an open state, the intermediate gate 32 closest to the exit gate is in a closed state; when the entrance gate 31 is in an open state, the intermediate gate 32 closest to the entrance gate 31 is in a closed state.

[0038] In the initial state, the entrance gate 31, the exit gate and the intermediate gate 32 are all in a closed state. When the product is at the product entrance, the entrance gate 31 is opened, and the transmission component 21 in the partition 11 closest to the entrance gate 31 is started. The product can enter the partition 11 closest to the entrance gate 31 along the product entrance. At this time, only the partition 11 closest to the entrance gate 31 is in an open state; when the product enters the first partition 11, the entrance gate 31 is closed. At this time, the product channel is maintained in a closed environment under the action of the closed entrance gate 31 and the exit gate. Then the intermediate gate 32 can be opened at the same time or in sequence according to actual conditions, and the transmission component 21 can be started to realize the sequential transmission of the product in multiple partitions 11; when the product is transmitted to near the exit gate, the exit gate is opened and the intermediate gate 32 closest to the exit gate is closed. At this time, only the partition 11 closest to the exit gate is in an open state, and the product immediately leaves the product channel along the product outlet.

[0039] In the transmission mechanism 2, the transmission components 21 arranged in a one-to-one correspondence with the partitions 11 ensure the independent transmission of products in a single partition 11, so as to avoid the transmission of products in any partition 11 being affected by the transmission of other partitions 11, and when there is no product in the partition 11, the transmission component 21 in the partition 11 is suspended to achieve the purpose of reducing energy consumption; the gate mechanism can be set to open and close the multiple partitions 11 of the furnace body 1 in sections to avoid the large loss of gas and heat in the product channel caused by multiple partitions 11 being in an open state at the same time; at least one of the inlet gate 31 and the outlet gate is set to a closed state, and when the inlet gate 31 (or outlet gate) is opened, the intermediate gate 32 closest to the inlet gate 31 (or outlet gate) is closed, so that the product channel between the closed outlet gate (or inlet gate) and the intermediate gate 32 closest to the inlet gate 31 (or outlet gate) is closed, thereby effectively avoiding the large loss of inert gas and heat in the product channel.

[0040] Under actual working conditions, multiple products will be transported in the furnace body 1 at the same time, and multiple products will enter the furnace body 1 at set time intervals. At this time, the opening or closing time of the intermediate gate 32, the entrance gate 31, and the exit gate can be set according to the time when multiple products enter the furnace body 1, so as to ensure the smooth transmission of multiple products while reducing the loss of inert gas and heat.

[0041] In some embodiments, see Appendix Figure 4-5 As shown, the entrance gate 31, the exit gate, and the intermediate gate have the same structure, including a door panel 311, a guide column 312, and a lifting drive (not shown). The guide column 312 is installed on the top of the furnace body 1. The door panel 311 vertically penetrates the top of the furnace body 1 and can be lifted and lowered along the guide column 312 under the action of the lifting drive. The guide column 312 can guide the movement direction of the door panel 311, thereby enabling the door panel 311 to be lifted and opened and closed in the vertical direction.

[0042] Furthermore, to ensure the consistency of the opening and closing positions of the door panels 311, in some embodiments, the top of the furnace body 1 is further provided with detection members (such as sensors) corresponding to the entrance gate 31, the exit gate, and the intermediate gate 32. The upper end of the door panel 311 is provided with an in-position detection piece 313 for detection by the detection member; when the detection member detects the in-position detection piece 313, the door panel 311 moves to the closed position, the lifting drive member immediately stops, and the door panel 311 is immediately maintained in the closed position. Furthermore, the upper end of the guide column 312 is provided with a stop block for the door panel 311 to abut, thereby limiting the upward movement position of the door panel 311.

[0043] In order to reduce the moving resistance of the door plate 311, a gap is usually left between the door plate 311 and the inner side wall of the furnace body 1 during the lifting of the door plate 311, which may cause the inert gas to escape from the gap between the door plate 311 and the inner side wall of the furnace body 1 when the door plate 311 is in the closed state. Therefore, in some embodiments, a side baffle 12 is arranged on the inner side wall of the furnace body 1 at the boundary between two adjacent partition areas 11, the side baffle 12 and the door plate 311 between the two adjacent partition areas 11 are staggered in the product conveying direction, and the side baffle 12 and the door plate 311 can partially overlap in the product conveying direction when the door plate 311 between the two partition areas 11 is in the closed state. The stop of the side baffle 12 can inhibit the escape of the inert gas, so as to reduce the amount of inert gas escaping as much as possible.

[0044] Further, the side baffle 12 gradually inclines towards the door plate 311 from the position close to the inner side wall of the furnace body 1 to the position away from the inner side wall of the furnace body 1, so as to reduce the gap between the side baffle 12 and the door plate 311 as much as possible.

[0045] In some embodiments, a pair of photoelectric sensors are arranged in the partition area 11 to detect the product. When the photoelectric sensors detect the product, the product is completely located in the partition area 11. The arrangement of the photoelectric sensors can detect the position of the product in the partition area 11, thereby facilitating the control of the opening and closing of the door plates 311 at both ends of the partition area 11.

[0046] For example, the door plates 311 at both ends of the partition area 11 are respectively a first door plate and a second door plate, and the first door plate is closer to the product inlet. In the initial state, the first door plate is in the open state, the product can enter the partition area 11 and enter the detection area of the photoelectric sensors, at this time, the product has completely entered the partition area 11, and the first door plate can be controlled to perform the closing action; as the product continues to be conveyed, the product will leave the detection area of the photoelectric sensors, at this time, the second door plate can be controlled to perform the opening action.

[0047] In some embodiments, the oxygen content of the partition area 11 is greater than 500 ppm, and the nitrogen content is less than 99.95%. The temperature of the partition area is not less than 60°C.

[0048] In some embodiments, referring to FIG. 1, the furnace body 1 comprises a plurality of partition areas 11, and each partition area 11 is provided with a pair of door plates 311. Figure 1As shown, the furnace body 1 is sequentially provided with five partition zones 11, and along the product transmission direction, the five partition zones 11 are sequentially the isolation zone 111, the preheating waiting zone 112, the constant temperature zone 113, the insulation isolation zone 114 and the cooling zone 115. Among them, the isolation zone 111 is used for the isolation of the product and the external environment; the preheating waiting zone 112 is used for preheating the product and waiting to enter the constant temperature zone 113; the constant temperature zone 113 is used for the constant temperature heat treatment of the product, and inert gas (such as nitrogen) is used as the heating medium during the heat treatment process, and the temperature of the constant temperature zone 113 is controlled at about 450°C; the insulation isolation zone 114 is used for the insulation treatment of the product; and the cooling zone 115 is used for the cooling treatment of the product.

[0049] Since waste gas is generated during the heat treatment process, in some embodiments, the top of the isolation zone 111 is provided with a waste discharge port 1111 which is in communication with the product channel. When the intermediate gate 32 is opened, the waste gas of the constant temperature zone 113 can be discharged along the product channel through the waste discharge port 1111.

[0050] In some embodiments, the preheating waiting zone 112 and the constant temperature zone 113 are each provided with a heating module for heating the product channel, and the heating module is a single-circulation heating module or a double-circulation heating module. Through the setting of the heating module, the product in the product channel can be heated and dried.

[0051] Among them, the single-circulation heating module is a heating cavity 41 provided with a single built-in heating element on one side of the furnace body 1, and the circulation of the airflow between the heating cavity 41 and the product channel is realized through a circulating fan 42. The double-circulation heating module is a heating cavity 41 provided with a built-in heating element on both sides of the furnace body 1, and each heating cavity 41 realizes the circulation of the airflow between the product channel through an independent circulating fan 42.

[0052] Further, the constant temperature zone 113 includes multiple temperature zones, and a temperature zone gate is arranged between the two temperature zones closest to the preheating waiting zone 112, and the structure of the temperature zone gate is the same as that of the intermediate gate 32. When the intermediate gate 32 between the constant temperature zone 113 and the preheating waiting zone 112 is in the open state, the temperature zone gate is in the closed state. Since the inert gas and the hot airflow are mainly concentrated in the constant temperature zone 113, the added temperature zone gate can further ensure the stability of the temperature and the gas concentration in the constant temperature zone 113.

[0053] In some embodiments, referring to the accompanying drawings, Figure 3 As shown, the furnace body 1 includes a pair of counterflow panels arranged oppositely, the top of the pair of counterflow panels is commonly provided with a top cover 13, the bottom of the pair of counterflow panels is commonly provided with a product channel, and one end of one counterflow panel close to the product inlet is provided with an air curtain machine 5. Through the setting of the air curtain machine 5, the environment in the product channel can be distinguished from the external environment.

[0054] Typically, products are placed on carriers for transport. When a carrier carrying a product is transported to the product exit, the product enters the next process, while the empty carrier remains on the conveyor mechanism 2. To recycle or temporarily store the empty carriers, in some embodiments, a carrier return mechanism 6 is provided below the furnace body 1. A carrier lifting mechanism is provided between the conveyor mechanism 2 near the product entrance and the carrier return mechanism 6. The carrier return mechanism 6 can return the carrier at the product exit to the product entrance, and then the carrier lifting mechanism can lift the carrier on the carrier return mechanism 6 onto the conveyor mechanism 2 to facilitate loading of the next product.

[0055] Since the transmission mechanism 2 is mostly chain-type transmission, metal dust is generated during the continuous transmission and friction of the chain. This dust may fall onto the carrier of the carrier return mechanism 6, and when the carrier is loaded with products again, it may contaminate the products. Based on this, in some embodiments, a dust collection mechanism 7 mounted on the furnace body 1 is further provided below the transmission mechanism 2. The dust collection mechanism 7 includes a dust box with an open top end, which extends along the product transmission direction and has a width greater than the width of the transmission mechanism 2. The provision of the dust collection mechanism 7 can collect dust that falls from the conveying mechanism, thereby reducing the risk of battery cell contamination.

[0056] In some embodiments, see Appendix Figure 5 As shown, the transmission assembly 21 includes a driving roller 212 and a driven roller mounted on a transmission frame 211. Two closed-loop chains are wound around the driving roller 212 and the driven roller. Several carrier plates 213 for supporting carriers are arranged evenly between the two closed-loop chains along the product transmission direction. Furthermore, a transmission drive (such as a motor) is provided on the transmission frame 211 and is connected to the driving roller 212.

[0057] At the product entrance, since the transmission component 21 is a runway-shaped closed-loop structure formed by a closed-loop chain and a support plate 213, the product entrance is at the end of the runway-shaped closed-loop structure, and its curvature is relatively large, and the carrier is prone to unstable placement. Therefore, in some embodiments, a connecting roller group 8 for carrying the carrier is provided on the transmission frame 211 near the product entrance. The connecting roller group 8 includes at least two connecting rollers, and the upper end faces of all the connecting rollers are located on the same plane, and the upper end face of the connecting roller closest to the product entrance is flush with the end face of the transmission component 21 carrying the carrier.

[0058] In addition, to ensure stable transmission of the carrier between two adjacent transmission assemblies 21, the distance between the two adjacent transmission assemblies 21 can be set to be smaller than the size of the carrier along the product transmission direction. Alternatively, a connecting roller set 8 can be added between the two transmission assemblies according to actual conditions.

[0059] The above implementation methods are only for illustrating the technical concept and features of the utility model. Its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the scope of protection of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the scope of protection of the utility model.

Claims

1. A multi-stage transmission curing oven, characterized in that: include A furnace body, one end of which is a product inlet and the other end of which is a product outlet; the furnace body is provided with at least three partitions in sequence along the product transmission direction, all of which together form a product channel connecting the product inlet and the product outlet; A conveying mechanism, the conveying mechanism including conveying components arranged in a one-to-one correspondence in the partition area and capable of operating independently, the conveying components being used to convey products in the product channel; A gate mechanism, comprising an entrance gate, an exit gate, and an intermediate gate that can be independently opened and closed to isolate or connect the product channel, the entrance gate and the exit gate being located at the product entrance and the product exit, respectively, and the intermediate gate being disposed between two adjacent separation zones in a one-to-one correspondence; At least one of the entrance gate and the exit gate is in a closed state, and when the exit gate is in an open state, the intermediate gate closest to the exit gate is in a closed state; when the entrance gate is in an open state, the intermediate gate closest to the entrance gate is in a closed state.

2. The multi-stage transmission curing oven according to claim 1, characterized in that: The entrance gate, exit gate and intermediate gate all include door panels, guide columns and lifting drive members. The guide columns are installed on the top of the furnace body. The door panels vertically penetrate the top of the furnace body and can be lifted and lowered along the guide columns under the action of the lifting drive member.

3. The multi-stage transmission curing oven according to claim 2, characterized in that: The top of the furnace body is also provided with detection parts corresponding to the entrance gate, exit gate and intermediate gate one by one, and the upper end of the door panel is provided with an in-place detection piece for detection by the detection part; when the detection part detects the in-place detection piece, the door panel is in a closed state.

4. The multi-stage transmission curing oven according to claim 2, characterized in that: The upper end portion of the guide column is provided with a stop block for the door panel to abut against.

5. The multi-stage transmission curing oven according to claim 2, characterized in that: The junction of two adjacent partitions is provided with side baffles arranged on the two inner side walls of the furnace body. When the door panel between the two partitions is in a closed state, the side baffles and the door panel can partially overlap in projection along the product transmission direction.

6. The multi-stage transmission curing oven according to claim 1, characterized in that: There are five separation zones on the furnace body in sequence. Along the product transmission direction, the five separation zones are the isolation zone, the preheating waiting zone, the constant temperature zone, the heat preservation isolation zone and the cooling zone in sequence; the top of the isolation zone is provided with a waste outlet connected to the product channel.

7. The multi-stage transmission curing oven according to claim 6, characterized in that: The preheating waiting area and the constant temperature area are both provided with heating modules for heating the product channel, and the heating modules are single-circulation heating modules or double-circulation heating modules.

8. The multi-stage transmission curing oven according to claim 1, characterized in that: The furnace body includes a pair of convection panels arranged opposite to each other, the tops of the pair of convection panels are commonly provided with a top cover, and the bottoms of the pair of convection panels are commonly provided with the product channel; and an air curtain is installed at one end of one of the convection panels close to the product inlet.

9. The multi-stage transmission curing oven according to claim 1, characterized in that: A dust collecting mechanism mounted on the furnace body is further provided below the transmission mechanism. The dust collecting mechanism includes a dust box with an open upper end. The dust box extends along the product transmission direction, and the width of the dust box is greater than the width of the transmission mechanism.

10. The multi-stage transmission curing oven according to claim 1, characterized in that: A carrier reflux mechanism is provided below the furnace body, and a carrier lifting mechanism is provided between the transmission mechanism near the product inlet and the carrier reflux mechanism.

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