Heat treatment furnace stable in transmission

Abstract

The heat treatment furnace comprises a furnace body, a conveying mechanism, a carrier locking mechanism and a carrier unlocking mechanism, the furnace body is sequentially provided with an isolation area, a drying area and a cooling area in the product conveying direction, and the isolation area, the drying area and the cooling area are jointly provided with a product channel penetrating through the furnace body; the drying area comprises at least one drying box body which is sequentially arranged, and circulating heating modules used for heating the product channel are symmetrically arranged on the two sides of each drying box body; the conveying mechanism comprises a carrier bearing face used for bearing a carrier, and at least one product is loaded on the carrier. The carrier locking mechanism is arranged on the carrier bearing surface and is used for locking the carrier on the carrier bearing surface; the carrier unlocking mechanism is at least arranged at the outlet of the product channel and used for unlocking the carrier locked by the carrier locking mechanism. According to the utility model, not only is the drying efficiency improved, but also the stability in the carrier conveying process can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cell production, in particular to a heat treatment furnace with stable transmission. Background Art

[0002] A plug-type drying furnace is a common heat treatment device used in solar cell production. Typically, a plug-type drying furnace consists of a furnace body, a conveyor, and a carrier. A carrier (such as a basket or boat) loaded with solar cells is transported within the furnace body via the conveyor for heat treatment (drying or cooling) of the cells. However, existing furnaces often utilize a single hot air circulation heating mode for drying. Due to the long single circulation path, insufficient negative pressure often results in low thermal cycle efficiency and poor drying time. Furthermore, the carrier is prone to tilting and shaking during transport, which can lead to the risk of solar cells falling off or breaking. Utility Model Content

[0003] In order to overcome the above shortcomings, the purpose of the present invention is to provide a heat treatment furnace with stable transmission, which not only improves the drying efficiency but also improves the stability of the carrier during transmission.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is: a heat treatment furnace with stable transmission, comprising

[0005] The furnace body is provided with an isolation zone, a drying zone, and a cooling zone in sequence along the product transmission direction. The isolation zone, the drying zone, and the cooling zone are jointly provided with a product channel running through the furnace body; the drying zone includes at least one drying box arranged in sequence, and a circulating heating module for heating the product channel is symmetrically provided on both sides of each drying box;

[0006] A conveying mechanism for conveying products within the product channel; the conveying mechanism includes a carrier receiving surface for receiving a carrier, wherein the carrier is loaded with at least one product;

[0007] A carrier locking mechanism is arranged on the carrier receiving surface and is used to lock the carrier on the carrier receiving surface;

[0008] The carrier unlocking mechanism is arranged at least at the exit of the product channel, and is used to release the carrier locked by the carrier locking mechanism.

[0009] The beneficial effects of the heat treatment furnace with stable transmission of the utility model are:

[0010] In the drying area, by arranging circulation heating modules on both sides of the drying box, the products in the product channel can be circulated and heated in a dual-path manner to improve the drying effect of the products; and compared with the single-circulation heating mode in the prior art, the setting of two circulation heating modules can shorten the airflow circulation path between the circulation heating module and the product channel, thereby improving the heat circulation efficiency; through the setting of the carrier locking mechanism, the carrier can be locked on the conveying mechanism during the process of the carrier being transported along the product channel with the conveying mechanism, so as to improve the stability of the carrier on the conveying mechanism, thereby ensuring the transmission stability of the products on the carrier; and through the setting of the carrier unlocking mechanism, the lock between the carrier and the conveying mechanism can be unlocked at the exit of the product channel to facilitate the carrier to detach from the conveying mechanism.

[0011] Furthermore, the circulating heating module includes a heating chamber, a circulating air duct, and a suction component. A heating element is provided in the heating chamber, and the circulating air duct is used to connect the heating chamber and the product channel. The suction component is arranged at the top of the heating chamber to suck the heating chamber so that the airflow in the heating chamber can circulate in the circulating air duct and the product channel.

[0012] The circulating air duct allows for independent airflow between the heating chamber and the product channel, while the suction assembly allows for airflow between the heating chamber and the product channel. When the heating elements and suction assemblies of the two circulating heating modules operate simultaneously, a dual-path circulating heating mode is achieved for the product channel.

[0013] By setting up the heating chamber and suction component of the two circulating heating modules, the airflow circulation path between a single heating chamber and the product channel can be shortened, which is equivalent to each heating chamber only needing to circulate and heat half of the space in the product channel in the drying area. Therefore, the power demand for the suction component can be reduced, ensuring the negative pressure stability within a single airflow circulation path.

[0014] Specifically, the circulating air duct includes a first air duct and a second air duct used in conjunction with each other. The first air duct is provided through the side wall of the drying box, and the second air duct is provided between the inner and outer bottom walls of the drying box. When the suction assembly is activated, the first air duct directs the airflow in the corresponding heating chamber into the product channel, and the second air duct returns the airflow in the product channel to the corresponding heating chamber. The coordination of the first and second air ducts forms a path for airflow between the side wall and the bottom wall of the drying box, thereby allowing the hot air entering the product channel through the first air duct to fully contact the product in the product channel.

[0015] Specifically, the two second air ducts are separated by a partition, and a return opening is provided on the inner bottom wall of the drying box body, communicating with both second air ducts. The return opening is covered with a second mesh plate fixed to the inner bottom wall of the drying box body. The partition is vertically arranged, with its upper end connected to the middle of the second mesh plate. The partition ensures the independent operation of the two second air ducts, preventing airflow from flowing between them. The return opening can also direct airflow from the drying channel into the second air duct.

[0016] Furthermore, the carrier locking mechanism includes a plurality of locking parts arranged on the carrier receiving surface along the product transmission direction, each locking part includes a locking member symmetrically arranged along the direction perpendicular to the product conveying direction, the locking member includes a locking block, an elastic member, and a movable member, the movable member can move back and forth along the direction perpendicular to the product conveying direction, the locking block is connected to the side of the movable member facing the carrier, the elastic member is located on the side of the locking block away from the carrier, one end of the elastic member abuts on the locking block, and the other end is fixed on the carrier receiving surface; when the locking block abuts on the carrier, the elastic member is in a compressed state.

[0017] The movement of the movable parts of the two locks can simultaneously drive the two locking blocks to move towards or away from the carrier, thereby locking or unlocking the carrier; and the elastic parts in the compressed state are arranged so that the locking blocks can be elastically pressed against the carrier, which not only ensures the locking of the carrier, but also avoids damage to the carrier surface caused by rigid pressure.

[0018] Specifically, the lock element includes a mounting base, which is fixed to the transmission mechanism and has a guide slot extending therethrough. The movable element includes a pull rod extending through the guide slot, with the end of the pull rod facing the carrier connected to the locking block. The elastic element includes a spring mounted on the pull rod, with one end of the spring abutting the locking block and the other end abutting the mounting base. The mounting base and the guide slot guide the movement of the pull rod, thereby ensuring the accuracy of the locking direction of the locking block.

[0019] Furthermore, the locking block is provided with a locking protrusion on the side facing the carrier. When the locking block abuts the carrier, the lower end surface of the locking protrusion also abuts the carrier. The lower end surface of the locking protrusion is a downwardly arched arc surface. The provision of the locking protrusion enables the locking block to abut the carrier at multiple points and in different directions, thereby enhancing the locking stability of the carrier. Furthermore, by designating the lower end surface of the locking protrusion as a downwardly arched arc surface, the contact between the locking protrusion and the carrier is linear, minimizing friction between the locking protrusion and the carrier.

[0020] Specifically, the unlocking mechanism includes unlocking members symmetrically arranged on the conveying mechanism perpendicular to the product conveying direction. Each unlocking member includes a plate arranged along the product conveying direction. The side of the plate away from the carrier is provided with an unlocking surface that can press against the moving member. When the carrier moves to the unlocking mechanism, the moving member can be moved away from the carrier under the action of the abutment surface, thereby disengaging the locking block from the carrier. The limited abutment of the unlocking surface can force the moving member to move away from the carrier, thereby disengaging the locking block from the carrier and unlocking the carrier.

[0021] Furthermore, a carrier reflux mechanism for transporting carriers is provided below the furnace body, and a lifting mechanism for lifting the carriers onto the product mechanism is provided between the transport mechanism near the product entrance and the carrier reflux mechanism.

[0022] Furthermore, the furnace body is equipped with a dust collection mechanism located between the conveyor mechanism and the carrier return mechanism. This mechanism includes a dust box with an open top, extending in the direction of product conveyance and wider than the conveyor mechanism. This mechanism catches dust that falls from the conveyor mechanism, preventing it from falling onto the carrier return mechanism and contaminating the carrier.

[0023] Furthermore, a connecting roller assembly for receiving carriers is located near the entrance to the product channel. This connecting roller assembly comprises at least two connecting rollers, all of which have their upper ends coplanar, with the upper end of the connecting roller closest to the product channel entrance being flush with the end of the conveyor mechanism that receives the carriers. The connecting roller assembly's transport of carriers provides a buffer for the transition of carriers onto the conveyor mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of a heat treatment furnace according to the present invention;

[0025] Figure 2 for Figure 1 A partial enlarged view of part A in the middle;

[0026] Figure 3 This is a schematic diagram of the three-dimensional structure of the furnace body according to an embodiment of the present utility model;

[0027] Figure 4 This is a schematic cross-sectional view of a drying box according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the three-dimensional structure of the drying box according to an embodiment of the present utility model;

[0029] Figure 6 This is a structural diagram of an embodiment of the utility model in which a carrier is placed on a transmission mechanism;

[0030] Figure 7 for Figure 6 A partial enlarged view of part B in the middle;

[0031] Figure 8 This is a schematic diagram of the structure of the vehicle locking mechanism and the vehicle unlocking mechanism in cooperation with each other in an embodiment of the present utility model;

[0032] Figure 9 This is a side view of the furnace body of an embodiment of the present utility model;

[0033] Figure 10 for Figure 9 A partial enlarged view of the middle C area;

[0034] Figure 11 This is a schematic structural diagram of a dust box according to an embodiment of the present utility model.

[0035] In the picture:

[0036] 1 - furnace body; 11 - isolation zone; 12 - drying zone; 121 - drying box; 1211 - reflux opening; 1212 - waste outlet; 122 - circulating heating module; 1221 - heating chamber; 1222 - suction assembly; 1223 - heating element; 1224 - first air duct; 1225 - second air duct; 123 - first mesh plate; 124 - second mesh plate; 125 - partition; 13 - cooling zone; 131 - exhaust outlet; 14 - product channel; 15 - side baffle;

[0037] 2-transmission mechanism; 21-transmission frame; 22-closed loop chain; 23-support plate;

[0038] 3-carrier locking mechanism; 31-locking block; 311-locking protrusion; 32-elastic member; 33-moving member; 331-pull rod; 332-vertical rod; 34-mounting seat; 341-waist groove;

[0039] 4-carrier unlocking mechanism; 41-plate; 411-unlocking inclined plane; 412-pressing plane;

[0040] 5- Vehicle;

[0041] 6-Joint roller set;

[0042] 7-carrier reflux mechanism;

[0043] 81-dust box; 811-box body; 812-connecting plate; 813-support cover plate; 82-mounting plate; 821-support rod. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0045] Example

[0046] See attached Figure 1-3 As shown, a heat treatment furnace with stable transmission according to the present invention includes a furnace body 1, a transmission mechanism 2, a carrier locking mechanism 3, and a carrier unlocking mechanism 4. The furnace body 1 is sequentially provided with an isolation zone 11, a drying zone 12, and a cooling zone 13 along the product transmission direction. The isolation zone 11, the drying zone 12, and the cooling zone 13 collectively define a product channel 14 that runs through the furnace body 1. The drying zone 12 includes at least one drying box 121 arranged in sequence, each of which has a circulating heating module 122 symmetrically disposed on both sides for heating the product channel. The transmission mechanism 2 is used to transport products within the product channel 14 and includes a carrier receiving surface for receiving a carrier 5, which is loaded with at least one product. The carrier locking mechanism 3 is disposed on the carrier receiving surface to lock the carrier 5 thereon. The carrier unlocking mechanism 4 is disposed at least at the exit of the product channel 14 to release the carrier 5 from the locking mechanism 3.

[0047] For details, see the attached Figure 4-5 As shown, the circulating heating module 122 includes a heating chamber 1221, a circulating air duct, and a suction component 1222 (such as a suction fan). A heating element 1223 is provided in the heating chamber 1221, and the circulating air duct is used to connect the heating chamber 1221 and the product channel 14; the suction component 1222 is arranged at the top of the heating chamber 1221, and is used to suck the heating chamber 1221, so that the airflow in the heating chamber 1221 can circulate in the circulating air duct and the product channel 14.

[0048] During operation, the product (silicon wafer) is loaded onto the carrier 5 at the entrance of the product channel 14, and the carrier 5 is locked on the conveying mechanism 2 by the carrier locking mechanism 3, and the conveying mechanism 2 is started so that the carrier 5 carrying the product can pass through the isolation area 11, the drying area 12, and the cooling area 13 in sequence along the product channel 14 to isolate, dry and cool the product; in the drying area 12, the product can be continuously dried by the provision of at least one drying box 121 to improve the drying efficiency of the product; by arranging circulating heating modules 122 on both sides of the drying box 121, and the heating chamber 1221, the circulating air duct and the suction component 1222 of each circulating heating module 122 can all independently circulate air with the product channel 14, when the heating element 1223 in the heating chamber 1221 is running, the hot air flow in the heating chamber 1221 can enter the product channel 14 along the circulating air duct under the action of the suction component 1222 to dry the product in the product channel 14. When the carrier 5 carrying the product moves to the exit of the product channel 14 , the carrier unlocking mechanism 4 can release the lock between the carrier and the conveying mechanism 2 , thereby facilitating the carrier 5 to detach from the conveying mechanism 2 .

[0049] In some embodiments, the circulating air duct includes a first air duct 1224 and a second air duct 1225 used in conjunction with each other. The first air duct 1224 is arranged through the side wall of the drying box 121, and the second air duct 1225 is clamped between the inner bottom wall and the outer bottom wall of the drying box 121; when the suction component 1222 is started, the first air duct 1224 will evenly guide the airflow in the corresponding heating chamber 1221 into the product channel 14, and the second air duct 1225 will return the airflow in the product channel 14 to the corresponding heating chamber 1221.

[0050] When the heating element 1223 in the heating chamber 1221 is running, the temperature in the heating chamber 1221 rises accordingly. At this time, with the suction of the suction component 1222, the hot air flow in the heating chamber 1221 can enter the product channel 14 along the first air duct 1224 to dry the product in the product channel 14; then in the product channel 14, the air flow after heat exchange with the product flows back to the heating chamber 1221 through the second air duct 1225 at the bottom thereof for reheating, thereby forming a circulating flow of air between the heating chamber 1221 and the product channel 14. The circulating flow of the air flow can ensure the temperature stability in the product channel 14, thereby ensuring the uniformity of heating of the product and improving the drying effect of the product. The first air duct 1224 is located on the side wall of the drying box 121, and the second air duct 1225 is located on the bottom wall of the drying box 121. During the circulation of the air flow, a path for air flow can be formed between the side wall and the bottom wall of the drying box 121, and the path is half as short as the path of the single-cycle heating module. In the same volume of circulating air flow, the circulation frequency increases, and the temperature compensation of the heating chamber is continuously performed to fill the heat carried away by the product through the temperature zone, so that the hot air flow entering the product channel 14 through the first air duct 1224 can fully contact the product in the product channel 14.

[0051] In some embodiments, see Appendix Figure 5 As shown, first mesh panels 123 covering the first air duct 1224 are arranged vertically on both inner sidewalls of the drying box 121. Air entering the drying box 121 through the first air duct 1224 is diverted by the first mesh panels 123 before entering the product channel 14. This ensures that the hot air in the first air duct 1224 is evenly distributed throughout the product channel 14, reducing temperature differences within the product channel 14 to a maximum temperature difference of no more than ±5°C.

[0052] In some embodiments, see Appendix Figure 4As shown, the inner bottom wall of the drying box 121 is provided with a return opening 1211 that communicates with both second air ducts 1225. The return opening 1211 is covered with a second mesh plate 124 fixed to the inner bottom wall of the drying box 121. Airflow within the product channel 14 can enter the second air ducts 1225 through the return opening 1211, and the second mesh plate 124 can evenly distribute the airflow.

[0053] Furthermore, to ensure the independence of the two second air ducts 1225, the second air ducts 1225 are arranged horizontally, and a partition 125 is provided between the two second air ducts 1225. The partition 125 is arranged vertically, with its upper end connected to the middle portion of the second mesh plate 124 and its lower end connected to the drying box 121. The provision of the partition 125 ensures the independent operation of the two second air ducts 1225 and prevents airflow from flowing between the two second air ducts 1225. Furthermore, because the partition 125 is connected to the middle portion of the second mesh plate 124, when airflow in the product channel 14 is diverted by the second mesh plate 124, the airflow diverted to one side of the partition 125 can enter the second air duct 1225 on the same side of the partition 125, while the airflow diverted to the other side of the partition 125 can enter the other second air duct 1225 on the same side of the partition 125.

[0054] In some embodiments, in order to reduce heat loss during airflow, the inner walls of the first air duct 1224 and the second air duct 1225 are both covered with a thermal insulation cotton layer.

[0055] During the drying process, waste gas is generated in the product channel 14 of the drying zone 12. In order to discharge the waste gas, in some embodiments, see the attached Figure 4 As shown, the top of the drying box 121 is provided with a waste outlet 1212 connected to the product channel 14, and a one-way valve is provided at the waste outlet 1212. The one-way valve can only be opened in a direction away from the product channel 14 to prevent external air from entering the product channel 14 through the waste outlet 1212.

[0056] In some embodiments, see Appendix Figure 3 As shown, cooling zone 13 includes a cooling box, which is equipped with a cooling fan and exhaust vents 131 on either side, perpendicular to the product conveying direction, connected to the product channel. The cooling fan draws cold air from the outside into product channel 14 located in cooling zone 13, thereby cooling the products therein. The air in product channel 14 is then discharged through exhaust vents 131, ensuring that cold air from the outside continues to flow from the cooling fan into product channel 14. Furthermore, side baffles 15 are installed at the intersections of isolation zone 11, drying zone 12, and cooling zone 13 to guide airflow and reduce airflow between different zones.

[0057] In some embodiments, see Appendix Figure 2 、 6 As shown in Figures 9 and 10, the transmission mechanism 2 includes a driving roller and a driven roller mounted on a transmission frame 21. Two closed-loop chains 22 are wound around the driven and driving rollers. Several support plates 23 are evenly spaced between the two closed-loop chains 22 along the product transmission direction. The outward-facing sides of the support plates 23 form carrier receiving surfaces for receiving the carriers 5. A transmission drive (e.g., a motor) connected to the driving rollers is provided on the transmission frame 21.

[0058] See attached Figure 6-8 As shown, the carrier locking mechanism 3 includes a plurality of locking parts arranged on the support plate 23 along the product transmission direction, each locking part includes a locking member symmetrically arranged along the direction perpendicular to the product conveying direction, and the locking member includes a locking block 31, an elastic member 32, and a moving member 33. The moving member 33 can move back and forth along the direction perpendicular to the product conveying direction. The locking block 31 is connected to the side of the moving member 33 facing the carrier 5, and the elastic member 32 is located on the side of the locking block 31 away from the carrier 5. One end of the elastic member 32 abuts on the locking block 31, and the other end is fixed on the support plate 23; when the locking block 31 abuts on the carrier 5, the elastic member 32 is in a compressed state.

[0059] During the transmission of the product and the carrier, the locking part can be transmitted synchronously with the product and the carrier 5. When the carrier 5 is placed on the carrier receiving surface, the cooperation of the two locking parts can make the two locking blocks 31 move simultaneously in the direction close to or away from the carrier 5, thereby realizing the limited locking or unlocking of the carrier 5; when the locking block 31 abuts against the carrier 5, the elastic part 32 in the compressed state can ensure that the locking block 31 locks the carrier 5, while avoiding damage to the surface of the carrier 5 caused by rigid pressure.

[0060] The number of locking portions can be the same as the number of support plates 23, with each locking portion correspondingly disposed on each support plate 23. Alternatively, the number of support plates 23 can be multiples of the number of locking portions, with multiple locking portions evenly spaced apart on the support plates 23. Regardless of the number of locking portions, the spacing between two adjacent locking portions must be less than the dimension of the carrier 5 along the product conveying direction, so that when the carrier 5 is placed on the conveying mechanism 2, at least one locking portion can lock the carrier 5.

[0061] In some embodiments, see Appendix Figure 7-8 As shown, the lock member also includes a mounting base 34, which is fixed to the support plate 23 and has a guide slot extending perpendicular to the product conveying direction. The movable member 33 includes a pull rod 331 extending through the guide slot. The end of the pull rod 331 facing the carrier 5 is connected to the locking block 31. The locking block 31 is suspended in the air, and its end away from the pull rod 331 is used to abut against the carrier 5.

[0062] Furthermore, the elastic member 32 comprises a spring mounted on the pull rod, one end of the spring abutting the locking block 31 and the other end abutting the mounting base 34. Because the mounting base 34 is fixed to the support plate 23, when an external force pulls the pull rod 331 away from the carrier 5, the locking block 31 moves synchronously, thereby compressing the spring. When the external force is removed, the spring returns the locking block 31 to move toward the carrier, thereby locking the carrier 5.

[0063] In order to ensure that the spring is always in a compressed state, in some embodiments, a waist-shaped groove 341 connected to the guide groove is provided at the upper end of the mounting seat 34. A vertical rod 332 that can be inserted into the waist-shaped groove 341 is fixedly provided on the pull rod 331. When the vertical rod 332 moves in the waist-shaped groove 341, the spring is always in a compressed state. When the vertical rod 332 moves to the end of the waist-shaped groove 341 close to the carrier 5, the locking block 31 can lock the carrier 5, and when the vertical rod 332 moves to the end of the waist-shaped groove 341 away from the carrier 5, the locking block 31 cannot lock the carrier 5. The setting of the waist-shaped groove 341 can limit the movement range of the vertical rod 332, thereby indirectly limiting the movement range of the pull rod 331 and the locking block 31.

[0064] In some embodiments, the locking block 31 has a locking protrusion 311 on the side facing the carrier. When the locking block 31 abuts the carrier 5, the lower end surface of the locking protrusion 311 also abuts the carrier 5, thereby limiting the vertical position of the carrier 5. Furthermore, the lower end surface of the locking protrusion 311 is a downwardly arched arc surface to minimize friction between the locking protrusion 311 and the carrier 5.

[0065] In some embodiments, see Appendix Figure 7-8 As shown, the carrier unlocking mechanism 4 includes unlocking members symmetrically arranged on the transmission mechanism 2 along a direction perpendicular to the product conveying direction. Each unlocking member includes a plate body 41 arranged along the product conveying direction. The plate body 41 is fixed to the transmission frame 21 and is suspended above the support plate 23. The side of the plate body 41 away from the carrier 5 is provided with an unlocking surface that can press against the moving member 33. Specifically, the unlocking surface includes an unlocking inclined surface 411 and a pressing plane 412 that are continuously arranged along the product conveying direction. The unlocking inclined surface 411 is located at the end of the pressing plane 412 away from the product channel outlet, and the unlocking inclined surface 411 gradually tilts away from the carrier 5 from the end away from the pressing plane 412 to the end close to the pressing plane 412, so that when the vertical rod 332 moves along the unlocking inclined surface 411 toward the pressing plane 412, the vertical rod 332 can drive the locking block 31 to move away from the carrier 5.

[0066] In actual configuration, the lower end surface of the plate body 41 should be higher than the upper end surface of the mounting seat 34 to ensure that the mounting seat 34 can pass under the plate body 41 when the vertical rod 332 moves along the unlocking surface of the plate body 41. Furthermore, to ensure that the vertical rod 332 can smoothly abut the unlocking inclined surface 411, the end of the unlocking inclined surface 411 away from the pressing plane 412 should be positioned closer to the carrier 5 than when the vertical rod 332 is in the locked state (in the locked state, the locking block 31 presses against the carrier 5, and the vertical rod 332 is located at the end of the waist-shaped groove 341 closer to the carrier 5). When the vertical rod 332 in the locked state moves to the unlocking member, it can directly abut the unlocking inclined surface 411. As the mounting seat 34 moves with the transmission mechanism 2, the vertical rod 332 can move along the unlocking inclined surface 411, thereby driving the locking block 31 to move away from the carrier 5. When the vertical rod 332 moves to the junction of the unlocking inclined surface 411 and the pressing plane 412, the vertical rod 332 can move to the end of the waist groove 341 away from the carrier 5. At this time, the locking block 31 no longer abuts against the carrier 5, and the carrier 5 is in the unlocked state.

[0067] The pressing plane 412 is always flat along the product transmission direction. After the vertical rod 332 moves to the pressing plane 412 along the unlocking inclined surface 411, the vertical rod 332 always presses against the pressing plane 412 to ensure that the locking block 31 always remains in a state of not abutting against the carrier 5.

[0068] In some embodiments, a carrier unlocking mechanism 4 may also be provided at the entrance of the product channel 14. At the entrance of the product channel 14, as the conveyor mechanism 2 transports the product, the vertical rod 332 first contacts the pressing flat surface 412 of the carrier unlocking mechanism 4 and then contacts the unlocking inclined surface 411 of the carrier unlocking mechanism 4. At the exit of the product channel 14, the vertical rod 332 first contacts the unlocking inclined surface 411 of the carrier unlocking mechanism 4 and then contacts the pressing flat surface 412 of the carrier unlocking mechanism 4.

[0069] Since the transmission mechanism 2 is a racetrack-shaped closed loop structure formed by the closed loop chain 22 and the support plate 23, the entrance and exit of the product channel 14 are both ends of the racetrack-shaped closed loop structure, and the curvature is large, which makes it easy for the carrier to be placed unstable. Therefore, in some embodiments, see the attached Figure 2 、 9 As shown, a connecting roller group 6 for receiving the carrier 5 is respectively provided on the conveying frame 21 near the entrance and exit of the product channel 14. The connecting roller group 6 includes at least two connecting rollers. The upper end surfaces of all the connecting rollers are located on the same plane, and the upper end surface of the connecting roller closest to the entrance or exit of the product channel is flush with the end surface of the conveying mechanism 2 for receiving the carrier.

[0070] As products flow from the exit of the product channel 14 to the next process step, empty carriers 5 may remain on the conveyor mechanism 2. To recover or temporarily store these empty carriers 5, in some embodiments, a carrier return mechanism 7 is provided beneath the furnace body 1 for transferring carriers 5. Furthermore, a lifting mechanism is provided between the conveyor mechanism 2 and the carrier return mechanism 7 near the entrance of the product channel 14 to lift the carriers 5 onto the conveyor mechanism 2. The carrier return mechanism 7 can return carriers at the exit of the product channel 14 to the entrance of the product channel 14. The lifting mechanism can then lift the carriers 5 on the carrier return mechanism 7 onto the conveyor mechanism 2 for loading the next product.

[0071] During the operation of the transmission mechanism 2, the continuous transmission friction of the closed-loop chain 22 will generate metal dust, which may fall onto the carrier 5 of the carrier return mechanism 7 and may contaminate the product when the carrier 5 is loaded with the product again. Figure 9-10 As shown, the furnace body 1 is also provided with a dust collecting mechanism located between the transmission mechanism 2 and the carrier reflux mechanism 7. The dust collecting mechanism includes a dust box 81 with an open upper end. The dust box 81 extends along the product transmission direction, and the width of the dust box 81 (the width refers to the dimension perpendicular to the product transmission direction) is greater than the width of the transmission mechanism 2.

[0072] For details, see the attached Figure 10-11 As shown, the dust box 81 comprises multiple box bodies 811 arranged sequentially along the product transport direction. A channel connecting plate 812 connects and secures any two adjacent box bodies 811. This connection of multiple box bodies 811 allows the length of the dust box 81 to be flexibly adjusted based on actual operating conditions. Furthermore, the connecting plate 812 can be secured to the box bodies 811 via welding, plug-in connections, or threaded connections.

[0073] In some embodiments, the dust collecting mechanism further includes mounting plates 82 symmetrically arranged on both sides of the dust box 81. The mounting plates 82 are L-shaped and fixedly connected to the furnace body 1. The mounting plates 82 are provided with support rods 821 extending in the product conveying direction. Supporting cover plates 813 capable of being suspended on the support rods 821 are integrally provided on both sides of the box body 811. The cooperation between the supporting cover plates 813 and the support rods 821 ensures that the support rods 821 stably support the dust box 81, and also facilitates the separation of the supporting cover plates 813 and the support rods 821, thereby facilitating the timely cleaning of dust collected on the box body 811.

[0074] 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 heat treatment furnace with stable transmission, characterized by: include A furnace body, wherein the furnace body is sequentially provided with an isolation zone, a drying zone, and a cooling zone along the product conveying direction, wherein the isolation zone, the drying zone, and the cooling zone are jointly provided with a product passage running through the furnace body; the drying zone comprises at least one drying box arranged sequentially, and a circulating heating module for heating the product passage is symmetrically provided on both sides of each drying box; A conveying mechanism for conveying products within the product channel; the conveying mechanism includes a carrier receiving surface for receiving a carrier, wherein the carrier is loaded with at least one product; A carrier locking mechanism, arranged on the carrier receiving surface, for locking the carrier on the carrier receiving surface; The carrier unlocking mechanism is arranged at least at the exit of the product channel, and is used to release the carrier locked by the carrier locking mechanism.

2. The heat treatment furnace with stable transmission according to claim 1, characterized in that: The circulating heating module includes a heating chamber, a circulating air duct, and a suction component. A heating element is provided in the heating chamber. The circulating air duct is used to connect the heating chamber and the product channel. The suction component is arranged at the top of the heating chamber to suck the heating chamber so that the airflow in the heating chamber can circulate in the circulating air duct and the product channel.

3. The heat treatment furnace with stable transmission according to claim 2, characterized in that: The circulating air duct includes a first air duct and a second air duct used in conjunction with each other. The first air duct is arranged through the side wall of the drying box body, and the second air duct is clamped between the inner bottom wall and the outer bottom wall of the drying box body; when the suction component is started, the first air duct will guide the airflow in the corresponding heating chamber into the product channel, and the second air duct will return the airflow in the product channel to the corresponding heating chamber.

4. The heat treatment furnace with stable transmission according to claim 3, characterized in that: The two second air ducts are separated by a partition, and a return opening connected to both second air ducts is provided on the inner bottom wall of the drying box body. The return opening is covered with a second mesh plate fixed to the inner bottom wall of the drying box body. The partition is arranged vertically, and its upper end is connected to the middle part of the second mesh plate.

5. The heat treatment furnace with stable transmission according to claim 1, characterized in that: The carrier locking mechanism includes a plurality of locking parts arranged on the carrier receiving surface along the product transmission direction, each of the locking parts includes a locking member symmetrically arranged along the direction perpendicular to the product conveying direction, the locking member includes a locking block, an elastic member, and a movable member, and the movable member can move back and forth along the direction perpendicular to the product conveying direction, the locking block is connected to the side of the movable member facing the carrier, the elastic member is located on the side of the locking block away from the carrier, one end of the elastic member abuts on the locking block, and the other end is fixed on the carrier receiving surface; when the locking block abuts on the carrier, the elastic member is in a compressed state.

6. The heat treatment furnace with stable transmission according to claim 5, characterized in that: The locking member also includes a mounting seat, which is fixed to the transmission mechanism and has a guide groove extending therethrough; the movable member includes a pull rod passing through the guide groove, and one end of the pull rod facing the carrier is connected to the locking block; the elastic member includes a spring sleeved on the pull rod, one end of the spring abuts against the locking block, and the other end abuts against the mounting seat.

7. The heat treatment furnace with stable transmission according to claim 5, characterized in that: The locking block is provided with a locking protrusion on the side facing the carrier; when the locking block abuts against the carrier, the lower end surface of the locking protrusion also abuts against the carrier; the lower end surface of the locking protrusion is a downwardly arched arc surface.

8. The heat treatment furnace with stable transmission according to claim 7, characterized in that: The unlocking mechanism includes unlocking members symmetrically arranged on the transmission mechanism in a direction perpendicular to the product conveying direction, and each of the unlocking members includes a plate body arranged along the product conveying direction, and the side of the plate body away from the carrier is provided with an unlocking surface that can press against the moving member; and when the carrier moves to the unlocking mechanism, the moving member can move in a direction away from the carrier under the action of the abutting surface, so that the locking block disengages from the carrier.

9. The heat treatment furnace with stable transmission according to claim 1, characterized in that: A carrier return mechanism for transmitting the carrier is provided below the furnace body, and a lifting mechanism for lifting the carrier onto the product mechanism is provided between the transmission mechanism and the carrier return mechanism near the product entrance; the furnace body is also provided with a dust collecting mechanism located between the transmission mechanism and the carrier return mechanism, and 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 heat treatment furnace with stable transmission according to claim 1, characterized in that: A connecting roller group for receiving the carrier is provided near the entrance of the product channel, and the connecting roller group includes at least two connecting rollers. The upper end surfaces of all the connecting rollers are located on the same plane, and the upper end surface of the connecting roller closest to the entrance of the product channel is flush with the end surface of the transmission mechanism for receiving the carrier.

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