Improved double-layer tunnel furnace system and operation method

Abstract

The invention relates to the field of tunnel furnace equipment, in particular to an improved double-layer tunnel furnace system and an operation method.The system comprises a feeding and discharging stage, a conveying and heating stage, a transfer transition stage and a tray used for bearing to-be-treated objects which are arranged in sequence; the feeding and discharging stage is used for conveying trays and articles to the conveying and heating stage, the conveying and heating stage is used for heating the trays and the articles, and the transfer transition stage is used for transferring the heated trays and articles to the conveying and heating stage again and carrying out secondary heating treatment; the feeding and discharging stage is further used for conveying and transferring the trays and the articles subjected to secondary heating treatment and stacking the trays and the articles in order; through full-process automatic operation, the production efficiency is improved, and the labor cost is reduced; by utilizing the structural advantages of the double-layer tunnel furnace, the heating efficiency and quality are obviously improved; a precise driving mechanism ensures reliable operation, flexible design meets various requirements, and precise heat treatment is achieved.

Description

Technical Field

[0001] The invention relates to the field of tunnel furnace equipment, and in particular to an improved double-layer tunnel furnace system and an operating method. Background Art

[0002] In industrial production, tunnel furnace is a commonly used heating equipment, widely used in electronics, food, chemical and other industries; in existing tunnel furnace equipment, there are often problems such as uneven heating, low processing efficiency, and inflexible secondary heating; traditional tunnel furnaces usually only have a single heating channel, and the items pass through the furnace at one time, making it difficult to ensure that each part can be fully heated; at the same time, the material loading and unloading process is cumbersome and difficult to achieve automation and efficient management; in addition, for items that require secondary heating treatment, additional equipment or processes are often required, which increases production costs and time costs. Summary of the invention

[0003] In order to solve some of the problems existing in the above-mentioned prior art, the present invention provides an improved double-layer tunnel furnace system, which realizes efficient and uniform heating treatment of the items to be processed through unique design of loading and unloading stages, conveying and heating stages, transfer transition stages, and a specially designed tray structure, and has a secondary heating function, which greatly improves the efficiency and effect of heat treatment.

[0004] To achieve the above-mentioned purpose, the present invention provides an improved double-layer tunnel furnace system, which includes a loading and unloading stage, a conveying and heating stage, a transfer and transition stage, and a tray for carrying items to be processed, which are arranged in sequence; the loading and unloading stage is used to convey the tray and the items to the conveying and heating stage, the conveying and heating stage is used to heat the tray and the items, and the transfer and transition stage is used to transfer the tray and the items after the heat treatment back to the conveying and heating stage for secondary heating treatment; the loading and unloading stage is also used to convey and transfer the tray and the items after the secondary heating treatment and stack them in an orderly manner.

[0005] As a further improvement of the present invention, in order to make the material feeding and discharging operations smoother, more stable and accurate, and at the same time increase the working range and operational flexibility of the suction device; the feeding and discharging stage includes a feeding and discharging equipment bracket, on which a conveying support roller assembly and a slide rail are provided; a slide rail is clamped with a slide plate, on which a connecting rod is installed; the connecting rod is also provided with a suction device, which can be moved on the slide rail through the slide plate and the connecting rod.

[0006] As a further improvement of the present invention, in order to adapt to pallets and items of different heights, the suction cup can be removed and replaced separately, thereby reducing maintenance costs and time and improving the maintainability and applicability of the equipment; the suction device includes a first mounting block and a second mounting block arranged on the connecting rod, and the first mounting block and the second mounting block are respectively provided with a first connecting light rod and a second connecting light rod; the lower ends of the first connecting light rod and the second connecting light rod are connected with a mounting base plate, and the lower end of the mounting base plate is provided with a connecting steel bar; a slide groove is provided on the connecting steel bar, and a suction cup is matched with the slide groove; the suction cup can be lifted and lowered on the first mounting block and the second mounting block respectively through the first connecting light rod and the second connecting light rod, and the suction cup can be removed and replaced separately; a limit block is provided on the top of the first connecting light rod, and the limit block is used to limit the lifting range of the suction cup.

[0007] As a further improvement of the present invention, in order to improve the degree of automation and operating accuracy in the feeding and unloading stages, better connect with upstream and downstream processes, and improve the production efficiency of the entire system; the feeding and unloading equipment bracket is also provided with a first driving device, a first transmission device and a second transmission device, and the first transmission device and the second transmission device are both provided with a pallet extraction device and a guide rail; the first driving device can drive the corresponding pallet extraction device to perform lifting movements on the guide rail respectively through the first transmission device and the second transmission device.

[0008] As a further improvement of the present invention, in order to better extract and place pallets and improve the safety and accuracy of operations; the pallet extraction device includes a mounting plate, one side of the mounting plate is provided with a plurality of blocks and connected to the guide rails through the blocks; the other side of the mounting plate is provided with a plurality of cantilever connecting rods, and the cantilever connecting rods are provided with a telescopic device; an extraction pallet is installed on the end head of the telescopic device, and the extraction pallet can perform telescopic movement through the telescopic device; the extraction pallet is "L"-shaped as a whole, and a roller assembly is also provided on the extraction pallet.

[0009] As a further improvement of the present invention, in order to achieve stable movement of pallets and articles in the furnace and improve conveying efficiency; at the same time, the double-layer conveying setting of the upper conveying mechanism and the lower conveying mechanism improves space utilization and heating efficiency; the conveying and heating stage includes a tunnel furnace body, which is provided with a circulating fan; a heating device is provided in the tunnel furnace body, and an observation window is provided on the side of the tunnel furnace body; the tunnel furnace body is also penetrated by an upper conveying mechanism and a lower conveying mechanism arranged in parallel, and a stabilizing bracket is provided between the upper conveying mechanism and the lower conveying mechanism; the upper conveying mechanism and the lower conveying mechanism are both provided with a second driving device, a third transmission device and a pulley assembly, and the second driving device can drive the pulley assembly to rotate through the transmission device, thereby driving the pallet and articles to move horizontally.

[0010] As a further improvement of the present invention, in order to accurately and flexibly transfer the pallets and articles after the heat treatment and ensure the continuity of the entire system; the transfer transition stage includes a base, a fourth transmission device and a connecting frame, and the fourth transmission device is fixedly mounted on the base through the connecting frame; the fourth transmission device is provided with a chain, and the chain is clamped with a pallet extraction device; the connecting frame is provided with a third drive device, and the third drive device drives the pallet extraction device to follow the chain for circumferential motion through the fourth transmission device.

[0011] As a further improvement of the present invention, in order to facilitate the classification and placement of items of different types or batches, the convenience of material management and the flexibility of production operations are improved; at the same time, the introduction of through holes improves the heat transfer efficiency during the heating process, so that the items are heated evenly; the tray includes a partition, and the tray is provided with a plurality of groove placement areas separated by partitions; the groove placement areas are provided with through holes, and a plurality of through holes are provided.

[0012] One of the beneficial effects of the present invention is that through the coordinated work of the feeding and unloading stage, the conveying and heating stage, and the transfer and transition stage, the full process automation operation from material conveying, heating treatment to secondary heating and final orderly stacking and placement is realized, which greatly improves production efficiency, reduces manual intervention, and reduces labor costs; the suction device and the tray extraction device are used in the feeding and unloading stage, which can accurately and quickly complete the loading and unloading of the tray, and at the same time realize the stacking of the tray, saving space; in the conveying and heating stage, the double-layer conveying mechanism is combined with a powerful heating device and a circulating fan to ensure that the items are heated evenly, thereby improving the heating efficiency and quality; the design of the transfer and transition stage makes it easy for the tray and the items to achieve secondary heating treatment, further enhancing the flexibility and applicability of the system; in addition, the structural design of the tray also fully considers practicality. Through the setting of partitions and groove placement areas, and the provision of through holes, it is not only convenient to place and fix the items, but also promotes the circulation of hot air and improves the heating effect; the invention can be widely applied to the heating treatment needs of various industries, effectively improving the production efficiency and competitiveness of enterprises.

[0013] The present invention also provides an improved double-layer tunnel furnace system operation method, which comprehensively optimizes the performance of the double-layer tunnel furnace system, reduces production costs, and improves product competitiveness. The operation method comprises the following steps: Step 1: Place the items to be processed in the groove placement area of ​​the tray. The groove placement area is divided into multiple areas by partitions to facilitate the classification and placement of items. The through holes help ventilation and uniform heat distribution. Then place the tray and the items to be processed on the conveyor support roller assembly at the loading and unloading stage. Step 2: Start the first driving device on the feeding and unloading equipment bracket, and the first driving device drives the corresponding pallet extraction device to perform lifting movement on the guide rail through the first transmission device; when the pallet extraction device descends to a suitable position, the extraction support plate on its mounting plate extends through the telescopic device to facilitate lifting the pallet; then the pallet extraction device holds the pallet and moves upward on the guide rail to a position where it docks with the conveying and heating stage; Step 3: After reaching the designated position, the roller assembly on the extraction tray starts to rotate, driving the tray and the items to move and transport them to the lower conveying mechanism of the conveying and heating stage; Step 4: Start the second driving device on the lower conveying mechanism and drive the pulley assembly to rotate through the third transmission device, thereby driving the tray and the items to move horizontally in the tunnel furnace body; Step 5: During the movement of the pallet and the items, the heating device in the tunnel furnace body heats them, and the circulating fan circulates the air in the furnace to ensure uniform heating. The operator can observe the situation in the furnace in real time through the observation window on the side of the tunnel furnace body, and adjust the heating parameters as needed to ensure that the items achieve the required heat treatment effect. When the heating treatment is completed once, the pallet and the items enter the transfer transition stage; Step 6: The transfer transition phase starts, the third driving device on the base drives the chain to move through the fourth transmission device, and the pallet extraction device mounted on the chain moves circumferentially with the chain; when the pallet extraction device moves to the position of the pallet after heating treatment, the extraction pallet extends and lifts the pallet, and then transfers the pallet and the items to the entrance of the upper conveying mechanism of the conveying and heating phase, and enters the conveying and heating phase again for secondary heating treatment, and the process is the same as step 5; Step 7: After the secondary heating treatment is completed, the pallet and the articles are transferred to the exit of the upper conveying mechanism in the conveying and heating stage again, and the suction device in the feeding and unloading stage starts to work in coordination at this time; the suction device moves to the top of the pallet on the slide rail through the slide plate and the connecting rod, and the suction cup in the suction device is lifted and lowered on the first mounting block and the second mounting block through the first connecting light rod and the second connecting light rod; when the pallet needs to be sucked, the suction cup descends and adsorbs the pallet, and the limit block at the top of the first connecting light rod limits the lifting range of the suction cup; Step 8: The suction device moves back with the pallet on the slide rail, and then starts the first driving device on the feeding and unloading equipment bracket. The first driving device drives the corresponding pallet extraction device to move up and down on the guide rail through the second transmission device; after the pallet extraction device moves to the corresponding height position, the suction cup in the suction device descends and releases the pallet, and the pallet is placed on the pallet extraction device; then the pallet extraction device moves down to the designated position and releases, completing the orderly stacking of the pallet and the items.

[0014] Another beneficial effect of the present invention is that the method makes full use of the structural advantages of the double-layer tunnel furnace, and significantly improves the heating efficiency and processing quality through layered transportation and secondary heating treatment; moreover, in each operation stage, the precise driving and transmission mechanism ensures the smooth movement and precise positioning of the tray and the items, making the entire heating process more reliable and controllable; at the same time, the ingenious design of the suction device and the tray extraction device, as well as the consideration of details such as the through hole and the roller assembly, further enhance the flexibility and practicality of the system; in addition, the operator can adjust the heating parameters in real time through the observation window to ensure the accurate achievement of the heat treatment effect.

[0015] When the present invention is working, firstly, the articles to be processed are placed in the groove placement area of ​​the tray, and the tray and the articles are placed on the conveying support roller assembly in the feeding and unloading stage; then the first driving device is started, and the tray extraction device is driven to rise and fall on the guide rail through the first transmission device, and the tray is lifted up and moved to the lower conveying mechanism in the conveying and heating stage by the extraction pallet; then the second driving device is started, and the pulley assembly is driven by the third transmission device, so that the tray and the articles are moved horizontally in the tunnel furnace body and subjected to heating treatment; after the primary heating is completed, the tray extraction device on the chain is driven by the third driving device and the fourth transmission device in the transfer transition stage to transfer the tray and the articles to the upper conveying mechanism for secondary heating; after the secondary heating, the suction device in the feeding and unloading stage moves on the slide rail through the slide plate and the connecting rod, and the tray is adsorbed and brought back by the suction cup, and then the tray extraction device is lifted up and down on the guide rail to stack the tray and the articles in an orderly manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to facilitate the understanding of those skilled in the art, the present invention is further described below with reference to the accompanying drawings: Figure 1 It is an overall front view of the present invention.

[0017] Figure 2 It is an overall top view of the present invention.

[0018] Figure 3 It is a schematic diagram of the feeding and discharging stages in the present invention.

[0019] Figure 4 It is a schematic diagram of the transport heating stage in the present invention.

[0020] Figure 5 Schematic diagram of the transfer transition stage in the present invention Figure 1 .

[0021] Figure 6 Schematic diagram of the transfer transition stage in the present invention Figure 2 .

[0022] Figure 7 Schematic diagram of the transfer transition stage in the present invention Figure 3 .

[0023] Figure 8 It is a schematic diagram of the structure of the tray extraction device in the present invention.

[0024] Fig. 9 It is a schematic diagram of the structure of the tray in the present invention.

[0025] Fig.10 It is a schematic diagram of the workflow of the present invention.

[0026] Among them, 1 feeding and unloading stage, 101 feeding and unloading equipment bracket, 102 first driving device, 103 transmission support roller assembly, 104 slide rail, 105 tray extraction device, 1051 mounting plate, 1052 clamping block, 1053 cantilever connecting rod, 1054 extraction support plate, 1055 roller assembly, 1056 telescopic device, 106 first transmission device, 107 second transmission device, 108 slide plate, 109 connecting rod, 110 first connecting light rod, 111 first mounting block, 112 second connecting light rod, 113 second mounting block, 114 mounting bottom plate, 115 suction cup , 116 connecting steel bars, 117 slide grooves, 118 limit blocks, 119 guide rails, 2 conveying and heating stages, 201 second driving devices, 202 lower conveying mechanisms, 203 pulley assemblies, 204 upper conveying mechanisms, 205 tunnel furnace bodies, 206 circulating fans, 207 observation windows, 208 heating devices, 209 third transmission devices, 210 stable brackets, 3 transfer transition stages, 301 bases, 302 fourth transmission devices, 303 chains, 304 connecting frames, 305 third driving devices, 4 trays, 401 groove placement areas, 402 through holes, 403 partitions. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution in this application, Figure 1-10 The present invention is further described. The following examples are only used to more clearly illustrate the technical solution of the present invention, and are not intended to limit the protection scope of the present invention.

[0028] As shown in the figure, an improved double-layer tunnel furnace system comprises a feeding and discharging stage 1, a conveying and heating stage 2, a transfer and transition stage 3, and a tray 4 for carrying articles to be processed, which are arranged in sequence; the feeding and discharging stage 1 is used to convey the tray 4 and the articles to the conveying and heating stage 2, the conveying and heating stage 2 is used to heat the tray 4 and the articles, and the transfer and transition stage 3 is used to transfer the tray 4 and the articles after the heating treatment to the conveying and heating stage 2 again and perform a secondary heating treatment; the feeding and discharging stage 1 is also used to convey and transfer the tray 4 and the articles after the secondary heating treatment and stack them in an orderly manner; the feeding and discharging stage 1 comprises a feeding and discharging equipment bracket 101, and the feeding and discharging equipment bracket 101 is provided with a plurality of trays 4 and articles. A conveying support roller assembly 103 and a slide rail 104 are provided; a slide plate 108 is mounted on the slide rail 104, and a connecting rod 109 is installed on the slide plate 108; a suction device is also provided on the connecting rod 109, and the suction device can be moved on the slide rail 104 through the slide plate 108 and the connecting rod 109; the suction device includes a first mounting block 111 and a second mounting block 113 provided on the connecting rod 109, and a first connecting light rod 110 and a second connecting light rod 112 are respectively penetrated on the first mounting block 111 and the second mounting block 113; the lower ends of the first connecting light rod 110 and the second connecting light rod 112 are connected to a mounting base plate 114, and the lower end of the mounting base plate 114 is provided with a connecting steel The connecting steel bar 116 is provided with a slide groove 117, and a suction cup 115 is provided in the slide groove 117; the suction cup 115 can be lifted and lowered on the first mounting block 111 and the second mounting block 113 respectively through the first connecting light rod 110 and the second connecting light rod 112, and the suction cup 115 can be removed and replaced separately; a limit block 118 is provided at the top of the first connecting light rod 110, and the limit block 118 is used to limit the lifting range of the suction cup 115; the feeding and discharging equipment bracket 101 is also provided with a first driving device 102, a first transmission device 106 and a second transmission device 107, and the first transmission device 106 and the second transmission device 107 are both provided with a tray extraction device 105 and guide rail 119; the first driving device 102 can drive the corresponding tray extraction device 105 to perform lifting and lowering movements on the guide rail 119 respectively through the first transmission device 106 and the second transmission device 107; the tray extraction device 105 includes a mounting plate 1051, one side of the mounting plate 1051 is provided with a plurality of blocks 1052 and is connected to the guide rail 119 through the blocks 1052; the other side of the mounting plate 1051 is provided with a plurality of cantilever connecting rods 1053, and the cantilever connecting rods 1053 are provided with a telescopic device 1056; an extraction support plate 1054 is installed on the end of the telescopic device 1056, and the extraction support plate 1054 can perform telescopic movement through the telescopic device 1056;The extraction support plate 1054 is in an "L" shape as a whole, and a roller assembly 1055 is also provided on the extraction support plate 1054; the conveying and heating stage 2 includes a tunnel furnace body 205, and a circulating fan 206 is provided on the tunnel furnace body 205; a heating device 208 is provided in the tunnel furnace body 205, and an observation window 207 is provided on the side of the tunnel furnace body 205; an upper conveying mechanism 204 and a lower conveying mechanism 202 arranged in parallel are also penetrated in the tunnel furnace body 205, and a stabilizing bracket 210 is provided between the upper conveying mechanism 204 and the lower conveying mechanism 202; the upper conveying mechanism 204 and the lower conveying mechanism 202 are both provided with a second driving device 201, a third transmission device 209 and a pulley assembly 203, and the second driving device 201 can be driven by the transmission device 209 The driving pulley assembly 203 rotates, driving the tray 4 and the articles to move horizontally; the transfer transition stage 3 includes a base 301, a fourth transmission device 302 and a connecting frame 304, wherein the fourth transmission device 302 is fixedly mounted on the base 301 through the connecting frame 304; a chain 303 is arranged on the fourth transmission device 302, and a tray extraction device 105 is clamped on the chain 303; a third driving device 305 is arranged on the connecting frame 304, and the third driving device 305 drives the tray extraction device 105 to follow the chain 303 to perform circumferential movement through the fourth transmission device 302; the tray 4 includes a partition 403, and the tray 4 is divided into a plurality of groove placement areas 401 by the partition 403; the groove placement area 401 is matched with a through hole 402, and the through hole 402 is provided with a plurality of through holes 402. ;

[0029] As shown in the figure, an improved double-layer tunnel furnace system operation method is provided, and the operation method comprises the following steps: Step 1: Place the items to be processed in the groove placement area 401 of the tray 4. The groove placement area 401 is divided into multiple areas by partitions 403, which is convenient for classifying and placing items, and the through holes 402 are conducive to ventilation and uniform distribution of heat; then place the tray 4 and the items to be processed on the conveying support roller assembly 103 of the loading and unloading stage 1; Step 2: Start the first driving device 102 on the feeding and unloading equipment bracket 101, and the first driving device 102 drives the corresponding tray extraction device 105 to perform lifting movement on the guide rail 119 through the first transmission device 106; when the tray extraction device 105 descends to a suitable position, the extraction support plate 1054 on its mounting plate 1051 extends through the telescopic device 1056 to facilitate the lifting of the tray 4; then the tray extraction device 105 holds the tray 4 and moves upward on the guide rail 119 to a position where it docks with the conveying and heating stage 2; Step 3: After reaching the designated position, the roller assembly 1055 on the extraction tray 1054 starts to rotate, driving the tray 4 and the articles to move and transport them to the lower conveying mechanism 202 of the conveying and heating stage 2; Step 4: Start the second driving device 201 on the lower conveying mechanism 202 and drive the pulley assembly 203 to rotate through the third transmission device 209, thereby driving the tray 4 and the articles to move horizontally in the tunnel furnace body 205; Step 5: During the movement of the tray 4 and the articles, the heating device 208 in the tunnel furnace body 205 heats them, and the circulating fan 206 circulates the air in the furnace to ensure uniform heating; the operator can observe the situation in the furnace in real time through the observation window 207 on the side of the tunnel furnace body 205, and adjust the heating parameters as needed to ensure that the articles achieve the required heat treatment effect; when the first heating treatment is completed, the tray 4 and the articles enter the transfer transition stage 3; Step 6: The transfer transition stage 3 is started, and the third driving device 305 on the base 301 drives the chain 303 to move through the fourth transmission device 302, and the tray extraction device 105 clamped on the chain 303 follows the chain 303 to perform circumferential movement; when the tray extraction device 105 moves to the position of the tray 4 after the heating treatment, the extraction support plate 1054 extends and holds up the tray 4, and then transfers the tray 4 and the articles to the entrance of the upper conveying mechanism 204 of the conveying and heating stage 2, and enters the conveying and heating stage 2 again for secondary heating treatment, and the process is the same as step 5; Step 7: After the secondary heating treatment is completed, the tray 4 and the articles are transferred again to the exit of the upper conveying mechanism 204 of the conveying and heating stage 2, and the suction device of the feeding and unloading stage 1 starts to work in coordination; the suction device moves to the top of the tray 4 on the slide rail 104 through the slide plate 108 and the connecting rod 109, and the suction cup 115 in the suction device is lifted and lowered on the first mounting block 111 and the second mounting block 113 through the first connecting light rod 110 and the second connecting light rod 112; when it is necessary to suck the tray 4, the suction cup 115 descends and absorbs the tray 4, and the limit block 118 at the top of the first connecting light rod 110 limits the lifting range of the suction cup 115; Step 8: The suction device moves back with the pallet 4 on the slide rail 104, and then starts the first driving device 102 on the feeding and unloading equipment bracket 101. The first driving device 102 drives the corresponding pallet extraction device 105 to perform lifting movement on the guide rail 119 through the second transmission device 107; after the pallet extraction device 105 moves to the corresponding height position, the suction cup 115 in the suction device descends and releases the pallet 4, and the pallet 4 is placed on the pallet extraction device 105; then the pallet extraction device 105 moves down to the designated position and releases, completing the orderly stacking of the pallet 4 and the items.

[0030] When the present invention is working, firstly, the articles to be processed are placed in the groove placement area 401 of the tray 4, and the tray 4 and the articles are placed on the conveying support roller assembly 103 of the feeding and unloading stage 1; then the first driving device 102 is started, and the tray extraction device 105 is driven to rise and fall on the guide rail 119 through the first transmission device 106, and the tray 4 is lifted by the extraction support plate 1054 and moved to the lower conveying mechanism 202 of the conveying and heating stage 2; then the second driving device 201 is started, and the pulley assembly 203 is driven by the third transmission device 209, so that the tray 4 and the articles are placed on the tunnel furnace body 2 05 and perform heating treatment; after the first heating is completed, the tray extraction device 105 on the driving chain 303 is used to transfer the tray 4 and the articles to the upper conveying mechanism 204 for secondary heating through the third driving device 305 and the fourth transmission device 302 of the transfer transition stage 3; after the secondary heating, the suction device of the feeding and discharging stage 1 moves on the slide rail 104 through the slide plate 108 and the connecting rod 109, and uses the suction cup 115 to absorb the tray 4 and bring it back, and then the tray extraction device 105 is lifted and lowered on the guide rail 119 to stack the tray 4 and the articles in an orderly manner.

[0031] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. An improved double-layer tunnel furnace system, characterized in that: The system comprises a loading and unloading stage (1), a conveying and heating stage (2), a transfer and transition stage (3), and a tray (4) for carrying articles to be processed, which are arranged in sequence; the loading and unloading stage (1) is used to convey the tray (4) and the articles to the conveying and heating stage (2); the conveying and heating stage (2) is used to heat the tray (4) and the articles; the transfer and transition stage (3) is used to transfer the tray (4) and the articles after the heating treatment back to the conveying and heating stage (2) and perform a secondary heating treatment; the loading and unloading stage (1) is also used to convey and transfer the tray (4) and the articles after the secondary heating treatment and to stack them in an orderly manner.

2. An improved double-layer tunnel furnace system according to claim 1, characterized in that: The feeding and unloading stage (1) comprises a feeding and unloading equipment bracket (101), on which a conveying support roller assembly (103) and a slide rail (104) are arranged; a slide plate (108) is clamped on the slide rail (104), and a connecting rod (109) is installed on the slide plate (108); a suction device is also arranged on the connecting rod (109), and the suction device can be moved on the slide rail (104) through the slide plate (108) and the connecting rod (109).

3. An improved double-layer tunnel furnace system according to claim 2, characterized in that: The suction device comprises a first mounting block (111) and a second mounting block (113) arranged on the connecting rod (109); a first connecting light rod (110) and a second connecting light rod (112) are respectively passed through the first mounting block (111) and the second mounting block (113); a mounting base plate (114) is connected to the lower ends of the first connecting light rod (110) and the second connecting light rod (112); a connecting steel bar (116) is arranged at the lower end of the mounting base plate (114); the connecting steel bar (116) ) is provided with a slide groove (117), and a suction cup (115) is arranged in the slide groove (117); the suction cup (115) can be lifted and lowered on the first mounting block (111) and the second mounting block (113) respectively through the first connecting light rod (110) and the second connecting light rod (112), and the suction cup (115) can be disassembled and replaced separately; a limit block (118) is provided at the top end of the first connecting light rod (110), and the limit block (118) is used to limit the lifting range of the suction cup (115).

4. An improved double-layer tunnel furnace system according to claim 2, characterized in that: The loading and unloading equipment support (101) is also provided with a first driving device (102), a first transmission device (106) and a second transmission device (107); the first transmission device (106) and the second transmission device (107) are both provided with a tray extraction device (105) and a guide rail (119); the first driving device (102) can drive the corresponding tray extraction device (105) to perform lifting movements on the guide rail (119) through the first transmission device (106) and the second transmission device (107).

5. An improved double-layer tunnel furnace system according to claim 4, characterized in that: The tray extraction device (105) comprises a mounting plate (1051), one surface of which is provided with a plurality of clamping blocks (1052) and connected to a guide rail (119) via the clamping blocks (1052); the other surface of the mounting plate (1051) is provided with a plurality of cantilever connecting rods (1053), and the cantilever connecting rods (1053) are provided with a telescopic device (1056); an extraction support plate (1054) is installed on the end of the telescopic device (1056), and the extraction support plate (1054) can perform telescopic movement via the telescopic device (1056); the extraction support plate (1054) is in an "L" shape as a whole, and a roller assembly (1055) is also provided on the extraction support plate (1054).

6. The improved double-layer tunnel furnace system according to claim 1, characterized in that: The transport and heating stage (2) comprises a tunnel furnace body (205), on which a circulating fan (206) is provided; a heating device (208) is provided in the tunnel furnace body (205), and an observation window (207) is provided on the side of the tunnel furnace body (205); an upper conveying mechanism (204) and a lower conveying mechanism (202) arranged in parallel are also provided in the tunnel furnace body (205), and a stabilizing bracket (210) is provided between the upper conveying mechanism (204) and the lower conveying mechanism (202); a second driving device (201), a third transmission device (209) and a pulley assembly (203) are provided in the upper conveying mechanism (204) and the lower conveying mechanism (202), and the second driving device (201) can drive the pulley assembly (203) to rotate through the transmission device (209), thereby driving the tray (4) and the articles to move horizontally.

7. An improved double-layer tunnel furnace system according to claims 1 and 4, characterized in that: The transfer transition stage (3) comprises a base (301), a fourth transmission device (302) and a connecting frame (304); the fourth transmission device (302) is fixedly mounted on the base (301) via the connecting frame (304); a chain (303) is arranged on the fourth transmission device (302), and a tray extraction device (105) is clamped on the chain (303); a third driving device (305) is arranged on the connecting frame (304), and the third driving device (305) drives the tray extraction device (105) to follow the chain (303) to perform circumferential movement via the fourth transmission device (302).

8. The improved double-layer tunnel furnace system according to claim 1, characterized in that: The tray (4) comprises a partition (403), and the tray (4) is provided with a plurality of groove placement areas (401) separated by the partition (403); the groove placement areas (401) are provided with through holes (402), and a plurality of through holes (402) are provided.

9. An improved double-layer tunnel furnace system operation method, characterized in that: The operation method comprises the following steps: Step 1: placing the items to be processed in the groove placement area (401) of the tray (4), wherein the groove placement area (401) is divided into a plurality of areas by partitions (403) to facilitate the classification and placement of the items, and the through holes (402) facilitate ventilation and uniform distribution of heat; then placing the tray (4) and the items to be processed together on the conveying support roller assembly (103) of the loading and unloading stage (1); Step 2: Start the first driving device (102) on the feeding and unloading equipment support (101); the first driving device (102) drives the corresponding tray extraction device (105) to perform lifting movement on the guide rail (119) through the first transmission device (106); when the tray extraction device (105) descends to a suitable position, the extraction support plate (1054) on its mounting plate (1051) extends through the telescopic device (1056) to facilitate the lifting of the tray (4); then the tray extraction device (105) holds the tray (4) and moves upward on the guide rail (119) to a position where it docks with the conveying and heating stage (2); Step 3: After reaching the designated position, the roller assembly (1055) on the extraction tray (1054) starts to rotate, driving the tray (4) and the articles to move and transport them to the lower conveying mechanism (202) of the conveying and heating stage (2); Step 4: starting the second driving device (201) on the lower conveying mechanism (202) and driving the pulley assembly (203) to rotate via the third transmission device (209), thereby driving the tray (4) and the articles to move horizontally in the tunnel furnace body (205); Step 5: During the movement of the tray (4) and the articles, the heating device (208) in the tunnel furnace body (205) heats them, and the circulating fan (206) circulates the air in the furnace to ensure uniform heating. The operator can observe the situation in the furnace in real time through the observation window (207) on the side of the tunnel furnace body (205), and adjust the heating parameters as needed to ensure that the articles achieve the desired heat treatment effect. When the heating treatment is completed once, the tray (4) and the articles enter the transfer transition stage (3). Step 6: The transfer transition stage (3) is started, and the third driving device (305) on the base (301) drives the chain (303) to move through the fourth transmission device (302), and the tray extraction device (105) mounted on the chain (303) moves circumferentially following the chain (303); when the tray extraction device (105) moves to the position of the tray (4) after the heating treatment, the extraction support plate (1054) extends and holds up the tray (4), and then transfers the tray (4) and the articles to the entrance of the upper conveying mechanism (204) of the conveying and heating stage (2), and enters the conveying and heating stage (2) again for secondary heating treatment, and the process is the same as step 5; Step 7: After the secondary heating treatment is completed, the tray (4) and the articles are transferred again to the exit of the upper conveying mechanism (204) of the conveying and heating stage (2), and the suction device of the feeding and unloading stage (1) starts to work in coordination; the suction device moves on the slide rail (104) to the top of the tray (4) through the slide plate (108) and the connecting rod (109), and the suction cup (115) in the suction device is lifted and lowered on the first mounting block (111) and the second mounting block (113) through the first connecting rod (110) and the second connecting rod (112); when the tray (4) needs to be sucked, the suction cup (115) descends and adsorbs the tray (4), and the limit block (118) at the top of the first connecting rod (110) limits the lifting range of the suction cup (115); Step 8: The suction device moves back with the pallet (4) on the slide rail (104), and then starts the first driving device (102) on the feeding and unloading equipment bracket (101). The first driving device (102) drives the corresponding pallet extraction device (105) to move up and down on the guide rail (119) through the second transmission device (107); after the pallet extraction device (105) moves to the corresponding height position, the suction cup (115) in the suction device descends and releases the pallet (4), and the pallet (4) is placed on the pallet extraction device (105); then the pallet extraction device (105) moves down to the specified position and releases, completing the orderly stacking and placement of the pallet (4) and the articles.

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