Tunnel type drying oven

Abstract

The utility model provides a tunnel type drying oven. Penetrating openings are formed in the two ends of a drying oven body. A first conveying rod is horizontally arranged between the two first conveying frames, a second conveying rod is horizontally arranged between the two second conveying frames, a third conveying rod is horizontally arranged between the two third conveying frames, a fourth conveying rod is horizontally arranged between the two fourth conveying frames, and the first conveying belts and the second conveying belts are arranged in a staggered mode. The top of the first conveying belt and the top of the second conveying belt are equal in height. The lifting frames are externally connected with a lifting mechanism used for controlling the lifting frames to ascend and descend, and two lifting rods are horizontally and rotationally arranged between the two lifting frames. A plurality of lifting belts are rotationally wound on the two lifting rods, and the projection of the lifting belts in the vertical direction and the projection of the first conveying belt in the vertical direction are staggered. The tunnel type drying oven provided by the utility model can enable the processing effect to be better.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel ovens and relates to a tunnel oven. Background Art

[0002] The tunnel oven is a continuous drying equipment, which can continuously bake without interruption, improving the production efficiency of products. It is equipped with chain drives on both sides to solve the phenomenon of deviation during transportation. The oven is heated in sections, controlled by an independent electric box, and is convenient to operate. The structure mainly consists of two major parts: a conveyor system and a drying furnace. It has multi-segment independent PID temperature control, and the temperature in the furnace is uniform. The conveying speed is frequency conversion adjustable, easy to adjust, runs smoothly, and has high production efficiency.

[0003] At present, the common tunnel ovens on the market mainly include an oven body and a conveyor belt (high temperature resistant) passing through the oven body; among them, there is a heating structure in the oven body, such as electric heating sheets, etc., which heats and dries the objects transported on the conveyor belt in the form of thermal radiation. In the actual drying production process, some products are directly placed at the upstream end of the conveyor belt and then enter the oven body for drying, and some products also need to be assembled or placed on the conveyor belt and then sent into the oven body; for example, in the use of food ovens such as pizza, the dough needs to be first placed on the conveyor belt, and then corresponding foods, such as cheese, ham, etc., are placed on the dough, and then sent into the oven body; another example is some objects that are adhered by hot melting, and the objects to be adhered and the adhesive need to be placed properly and then sent into the oven body together, and automatic hot melting and adhesion are completed in the oven body; however, since if the objects are placed properly and then placed on the conveyor belt, it is easy to cause the objects to fall or be misaligned, etc., so in some places, the method adopted is to stop the conveyor belt, then place the objects properly, and then start the conveyor belt to send the objects into the oven body; although this can better ensure that the objects to be dried and processed can enter the drying body in a proper state, the drying time of the objects in the drying body is easily affected by the operation time of the workers, which is likely to cause the situation that the objects are dried and heated for too long or too short, resulting in poor processing effects. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a tunnel oven, aiming to solve the problem of poor processing effects.

[0005] To solve the above technical problems, the utility model provides a tunnel oven, including:

[0006] An oven body, through openings are provided at both ends of the oven body;

[0007] The first conveyor rack, the second conveyor rack, the third conveyor rack, and the fourth conveyor rack are arranged in sequence. There are two of each of the first conveyor rack, the second conveyor rack, the third conveyor rack, and the fourth conveyor rack. A first conveyor rod is horizontally arranged between the two first conveyor racks, a second conveyor rod is horizontally arranged between the two second conveyor racks, a third conveyor rod is horizontally arranged between the two third conveyor racks, and a fourth conveyor rod is horizontally arranged between the two fourth conveyor racks. The first conveyor rack, the second conveyor rack, the third conveyor rack, and the fourth conveyor rack are all externally connected to motors;

[0008] A first conveyor belt and a second conveyor belt. The middle parts of the first conveyor belt and the second conveyor belt both pass through the through holes on the oven body movably. There are several of the first conveyor belt and the second conveyor belt, and several of the first conveyor belt and the second conveyor belt are arranged in a staggered manner. The tops of the first conveyor belt and the second conveyor belt are at the same height. The sides of adjacent first conveyor belts and second conveyor belts are in a fitting state. The two ends of the first conveyor belt are respectively wound around the first conveyor rod and the fourth conveyor rod, and the two ends of the second conveyor belt are respectively wound around the second conveyor rod and the third conveyor rod;

[0009] A lifting rack. The lifting rack is externally connected to a lifting mechanism for controlling the lifting of the lifting rack. There are two lifting racks. All the first conveyor belts are located between the two lifting racks. Two lifting rods are horizontally rotatably arranged between the two lifting racks. The lifting rods are located between the first conveyor rod and the second conveyor rod, and both of the two lifting rods pass through the loop of the first conveyor belt;

[0010] A lifting belt. Several lifting belts are rotatably wound around the two lifting rods. The projection of the lifting belt in the vertical direction is staggered with the projection of the first conveyor belt in the vertical direction. When the lifting belt is at the highest height, the top of the lifting belt is higher than the top of the first conveyor belt. When the conveyor belt is at the lowest height, the top of the conveyor belt is at the same height as the top of the first conveyor belt, or the top of the conveyor belt is lower than the top of the first conveyor belt.

[0011] The present utility model is further arranged such that the lifting rack includes a horizontal frame in a horizontal shape and a vertical frame vertically connected to the middle of the bottom of the horizontal frame. The cross-section of the vertical frame is rectangular, and the two lifting rods are rotatably connected to the two ends of the horizontal frame;

[0012] It further includes a vertical lifting cylinder. A vertical groove that is movably matched with the vertical frame is opened in the middle of the top end of the lifting cylinder.

[0013] The utility model is further configured as follows: linkage parts are horizontally arranged on both sides of the vertical frame, a long vertical hole is vertically opened on the side of the lifting cylinder, the linkage part is vertically movable in the vertical hole, and the lifting mechanism includes a stop block horizontally arranged on the outer wall of the lifting cylinder, and an elastic member which is continuously in a compressed state is arranged between the top of the stop block and the bottom of the linkage part.

[0014] The utility model is further configured such that the thickness of the lifting belt is greater than the thickness of the first conveying belt, and when the top of the linkage portion contacts the top of the vertical hole, the lifting belt is at the highest height, and the lifting rod is in a separated state from the first conveying belt.

[0015] The utility model is further configured that the two lifting cylinders are vertically provided with long strip holes on the opposite sides thereof, an integral rod is horizontally arranged between the two vertical frames, and the two ends of the integral rod are movably located in the two long strip holes respectively;

[0016] It also includes a fixed seat with a fixed position, on which an inclined driving rod is hingedly arranged, a hinged rod is hingedly arranged in the middle of the driving rod, and the top of the hinged rod is hinged to the middle of the integrated rod.

[0017] The utility model is further configured to include a fifth conveyor frame, a sixth conveyor frame, a seventh conveyor frame and an eighth conveyor frame arranged in sequence, wherein the third conveyor frame, the fifth conveyor frame, the fourth conveyor frame and the sixth conveyor frame are arranged in sequence;

[0018] The fifth conveying frame, the sixth conveying frame, the seventh conveying frame and the eighth conveying frame are each provided with two, a fifth conveying rod is horizontally arranged between the two fifth conveying frames, a sixth conveying rod is horizontally arranged between the two sixth conveying frames, a seventh conveying rod is horizontally arranged between the two seventh conveying frames, and an eighth conveying rod is horizontally arranged between the two eighth conveying frames, and a shaping frame is arranged on the top of the fifth conveying frame, the fourth conveying frame and the sixth conveying frame;

[0019] It also includes a first arc-shaped member and a second arc-shaped member with a longitudinal section in the shape of an arc with an opening downward, both ends of the first arc-shaped member and the second arc-shaped member are fixedly connected to the forming frame, and a plurality of clearance openings for the first conveyor belt to pass through the first arc-shaped member and the second arc-shaped member are opened;

[0020] A plurality of receiving belts are movably arranged between the fifth conveying rod and the seventh conveying rod, the lower side of the receiving belt located on the upper side is movably attached to the upper side of the first arc-shaped member, and the lower side of the receiving belt located on the lower side is movably attached to the upper side of the second arc-shaped member;

[0021] A plurality of external conveyor belts are movably wound around between the sixth conveyor rod and the eighth conveyor rod. Both ends of the receiving belt are lower than the first conveyor belt and the external conveyor belts respectively, and both ends of the receiving belt are staggered with the first conveyor belt and the external conveyor belts respectively.

[0022] Compared with the prior art, the present utility model provides a tunnel oven. When drying and processing some objects that need to be assembled, first, raise the lifting frame and make the top of the lifting belt higher than the top of the first conveyor belt. At this time, assembly can be carried out on the top of the lifting belt. For example, place the noodles on the lifting belt, or place the substrate on the lifting belt. Then, place other foods on the noodles, or place other objects that need to be heat-melted on the substrate. Then, lower the height of the lifting belt and make the top of the lifting belt lower than the top of the first conveyor belt, or at the same height as the top of the first conveyor belt. During the whole process, the motor drives the first conveyor rod, the second conveyor rod, the third conveyor rod, and the fourth conveyor rod to rotate. However, when assembling on the lifting belt, the lifting rod does not rotate. After the lifting rod descends in height, if the top of the lifting belt is lower than the first conveyor belt, the lifting rod does not need to rotate. However, if the top of the lifting belt is at the lowest height and is at the same height as the top of the first conveyor belt, at this time, the motor outside the lifting rod can also drive the lifting rod to rotate and make the lifting belt and the first conveyor belt convey objects downstream at the same time. The transmission speeds of the first conveyor belt, the second conveyor belt, and the lifting belt are equal. When the object enters the oven main body, the motor heating element in the oven main body generates heat and heats the object. Since the lifting belt is in a static state during assembly, the assembly operation can be carried out smoothly. Secondly, when the object moves onto the second conveyor belt, the time for the object to pass through the oven main body is fixed, so the drying quality can be guaranteed, that is, it can prevent the drying time from being too long or too short, and ensure the drying or baking quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of an embodiment of a tunnel oven of the present utility model;

[0024] Figure 2 is Figure 1 an enlarged view of part A in

[0025] Figure 3 is Figure 1 an enlarged view of part B in

[0026] Figure 4 is Figure 1 an enlarged view of part C in

[0027] Figure 5 is Figure 1 an enlarged view of part D in

[0028] Figure 6 It is a schematic diagram of an embodiment of a first arc-shaped member and a second arc-shaped member in a tunnel-type oven of the utility model.

[0029] Among them, 1, oven body; 2, first conveyor frame; 3, second conveyor frame; 4, third conveyor frame; 5, fourth conveyor frame; 6, first conveyor rod; 7, second conveyor rod; 8, third conveyor rod; 9, fourth conveyor rod; 10, first conveyor belt; 11, second conveyor belt; 12, lifting frame; 12a, horizontal frame; 12b, vertical frame; 13, lifting rod; 14, lifting belt; 15, lifting cylinder; 16, linkage part; 17, vertical hole; 18, end block; 1 9. Elastic member; 20. Long strip hole; 21. Integrated rod; 22. Fixed seat; 23. Driving rod; 24. Articulated rod; 25. Fifth conveyor frame; 26. Sixth conveyor frame; 27. Seventh conveyor frame; 28. Eighth conveyor frame; 29. ​​Fifth conveyor rod; 30. Sixth conveyor rod; 31. Seventh conveyor rod; 32. Eighth conveyor rod; 33. Forming frame; 34. First arc-shaped member; 35. Second arc-shaped member; 36. Make way; 37. Receiver belt; 38. Outer delivery belt. DETAILED DESCRIPTION

[0030] The following is a further detailed description of a tunnel oven proposed by the utility model in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the utility model will be more clear. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. The same or similar reference numerals in the drawings represent the same or similar components.

[0031] A tunnel oven, such as Figures 1 to 6 As shown, including:

[0032] An oven body 1, wherein both ends of the oven body 1 are provided with through openings;

[0033] A first conveying frame 2, a second conveying frame 3, a third conveying frame 4 and a fourth conveying frame 5 are arranged in sequence, two of the first conveying frame 2, the second conveying frame 3, the third conveying frame 4 and the fourth conveying frame 5 are arranged opposite to each other, a first conveying rod 6 is horizontally arranged between the two first conveying frames 2, a second conveying rod 7 is horizontally arranged between the two second conveying frames 3, a third conveying rod 8 is horizontally arranged between the two third conveying frames 4, a fourth conveying rod 9 is horizontally arranged between the two fourth conveying frames 5, and the first conveying frame 2, the second conveying frame 3, the third conveying frame 4 and the fourth conveying frame 5 are all externally connected to a motor;

[0034] A first conveyor belt 10 and a second conveyor belt 11, the middle parts of the first conveyor belt 10 and the second conveyor belt 11 both pass through the through - openings on the oven body 1 movably. A plurality of the first conveyor belts 10 and the second conveyor belts 11 are provided, and the plurality of first conveyor belts 10 and second conveyor belts 11 are arranged in a staggered manner. The tops of the first conveyor belt 10 and the second conveyor belt 11 are at the same height. The sides of adjacent first conveyor belts 10 and second conveyor belts 11 are in a fitting state. The two ends of the first conveyor belt 10 are respectively wound around the first conveyor rod 6 and the fourth conveyor rod 9, and the two ends of the second conveyor belt 11 are respectively wound around the second conveyor rod 7 and the third conveyor rod 8;

[0035] A lifting frame 12, the lifting frame 12 is externally connected with a lifting mechanism for controlling the lifting of the lifting frame 12. There are two lifting frames 12. All the first conveyor belts 10 are located between the two lifting frames 12. Two lifting rods 13 are horizontally rotatably arranged between the two lifting frames 12. The lifting rods 13 are located between the first conveyor rod 6 and the second conveyor rod 7, and both of the two lifting rods 13 pass through the loop of the first conveyor belt 10;

[0036] A lifting belt 14, a plurality of the lifting belts 14 are rotatably wound around the two lifting rods 13. The projection of the lifting belt 14 in the vertical direction is in a staggered state with the projection of the first conveyor belt 10 in the vertical direction. When the lifting belt 14 is at the highest height, the top of the lifting belt 14 is higher than the top of the first conveyor belt 10. When the conveyor belt is at the lowest height, the top of the conveyor belt is at the same height as the top of the first conveyor belt 10, or the top of the conveyor belt is lower than the top of the first conveyor belt 10.

[0037] The lifting frame 12 includes a horizontal frame 12a in a horizontal shape and a vertical frame 12b vertically connected to the middle of the bottom of the horizontal frame 12a. The cross - section of the vertical frame 12b is rectangular. The two lifting rods 13 are rotatably connected to the two ends of the horizontal frame 12a;

[0038] There is also a vertical lifting cylinder 15. A vertical groove for movably cooperating with the vertical frame 12b is opened in the middle of the top end of the lifting cylinder 15.

[0039] On both sides of the vertical frame 12b, a linkage part 16 is horizontally arranged. A long - strip vertical hole 17 is vertically opened on the side of the lifting cylinder 15. The linkage part 16 is vertically movably located in the vertical hole 17. The lifting mechanism includes a stop block 18 horizontally arranged on the outer wall of the lifting cylinder 15. An elastic member 19 in a continuously compressed state is arranged between the top of the stop block 18 and the bottom of the linkage part 16.

[0040] The thickness of the lifting belt 14 is greater than that of the first conveyor belt 10 . When the top of the linkage portion 16 contacts the top of the vertical hole 17 , the lifting belt 14 is at the highest height, and the lifting rod 13 is separated from the first conveyor belt 10 .

[0041] The two lifting cylinders 15 are vertically provided with long strip holes 20 on the opposite sides thereof, and an integral rod 21 is horizontally provided between the two vertical frames 12b, and the two ends of the integral rod 21 are movably located in the two long strip holes 20 respectively;

[0042] It also includes a fixed seat 22 (fixedly connected to the ground), on which an inclined driving rod 23 is hingedly provided, and a hinged rod 24 is hingedly provided in the middle of the driving rod 23, and the top of the hinged rod 24 is hinged to the middle of the integrated rod 21.

[0043] It also includes a fifth conveyor frame 25, a sixth conveyor frame 26, a seventh conveyor frame 27 and an eighth conveyor frame 28 which are arranged in sequence, and the third conveyor frame 4, the fifth conveyor frame 25, the fourth conveyor frame 5 and the sixth conveyor frame 26 are arranged in sequence;

[0044] The fifth conveying frame 25, the sixth conveying frame 26, the seventh conveying frame 27 and the eighth conveying frame 28 are each provided with two, a fifth conveying rod 29 is horizontally arranged between the two fifth conveying frames 25, a sixth conveying rod 30 is horizontally arranged between the two sixth conveying frames 26, a seventh conveying rod 31 is horizontally arranged between the two seventh conveying frames 27, and an eighth conveying rod 32 is horizontally arranged between the two eighth conveying frames 28, and a shaping frame 33 is arranged on the top of the fifth conveying frame 25, the fourth conveying frame 5 and the sixth conveying frame 26;

[0045] The first arc-shaped member 34 and the second arc-shaped member 35 are also included, and the longitudinal section is an arc-shaped member with an opening downward. Both ends of the first arc-shaped member 34 and the second arc-shaped member 35 are fixedly connected to the forming frame 33. A plurality of openings 36 for the first conveyor belt 10 to pass through the first arc-shaped member 34 and the second arc-shaped member 35 are provided.

[0046] A plurality of receiving belts 37 are movably arranged between the fifth conveying rod 29 and the seventh conveying rod 31, and the lower side of the receiving belt 37 located on the upper side is movably attached to the upper side of the first arc-shaped member 34, and the lower side of the receiving belt 37 located on the lower side is movably attached to the upper side of the second arc-shaped member 35;

[0047] A plurality of outer conveyor belts 38 (for conveying objects downstream for operations such as cooling, rinsing, and dust removal) are movably wound around between the sixth conveyor rod 30 and the eighth conveyor rod 32. Both ends of the receiving belt 37 are lower than the first conveyor belt 10 and the outer conveyor belts 38 respectively, and both ends of the receiving belt 37 are in a staggered shape with the first conveyor belt 10 and the outer conveyor belts 38 respectively.

[0048] For a tunnel-type oven provided by the present utility model, when drying and processing some objects that need to be assembled, first, the lifting frame 12 is raised, and the top of the lifting belt 14 is made higher than the top of the first conveyor belt 10. At this time, assembly can be carried out on the top of the lifting belt 14. For example, placing a noodle cake on the lifting belt 14, or placing a substrate on the lifting belt 14, and then placing other foods on the noodle cake, or placing other objects that need to be heat-melted on the substrate; then the height of the lifting belt 14 is lowered, and the top of the lifting belt 14 is made lower than the top of the first conveyor belt 10, or at the same height as the top of the first conveyor belt 10; during the whole process, the motor drives the first conveyor rod 6, the second conveyor rod 7, the third conveyor rod 8, and the fourth conveyor rod 9 to rotate, but when the assembly operation is carried out on the lifting belt 14, the lifting rod 13 does not rotate; after the height of the lifting rod 13 is lowered, if the top of the lifting belt 14 is lower than the first conveyor belt 10, then the lifting rod 13 does not need to rotate; but if the top of the lifting belt 14 is at the lowest height and is at the same height as the top of the first conveyor belt 10, then at this time, the motor outside the lifting rod 13 can also drive the lifting rod 13 to rotate and make the lifting belt 14 and the first conveyor belt 10 convey objects downstream at the same time; the transmission speeds of the first conveyor belt 10, the second conveyor belt 11, and the lifting belt 14 are equal; when the object enters the oven main body 1, the motor heating element in the oven main body 1 generates heat and heats the object. Since the lifting belt 14 is in a stationary state during assembly, the assembly operation can be carried out smoothly; secondly, when the object moves onto the second conveyor belt 11, the time for the object to pass through the oven main body 1 is fixed, so the drying quality can be guaranteed, that is, it can prevent the drying time from being too long or too short, and ensure the drying or baking quality.

[0049] During actual operation, under the elastic force of the elastic member 19, the linkage portion 16 abuts against the top of the vertical hole 17. At this time, the top of the lifting belt 14 is higher than the top of the first conveyor belt 10, and normal assembly can be carried out. After the assembly is completed, the worker only needs to step on the free end of the driving rod 23. The driving rod 23 pulls the integral rod 21 downward through the hinge rod 24. At the same time, the integral rod 21 drives the two vertical frames 12b downward until the bottom of the integral rod 21 abuts against the bottom of the long hole 20. At this time, the lifting belt 14 reaches the lowest height. In this application, it is preferably that when the lifting belt 14 is at the lowest height, the lifting rod 13 is automatically driven by the motor, and then the lifting belt 14 and the first conveyor belt 10 convey the object forward at the same time. Of course, according to the actual situation, it is also possible that the top of the lifting belt 14 is lower than the top of the first conveyor belt 10 at this time, and the object is only conveyed by the first conveyor belt 10. After the object is sent away from the lifting belt 14, the worker's foot releases the driving rod 23, and then the elastic member 19 pushes the linkage portion 16 upward, so that the lifting belt 14 rises to the highest height and waits for the next use.

[0050] If the object can smoothly transition to the downstream (equal height) conveyor belt at the ends of the first conveyor belt 10 and the second conveyor belt 11, it can be directly transitioned. However, if the object is prone to tipping over or has a soft shape and cannot be directly transitioned from the first conveyor belt 10 to the next conveyor belt (there is a gap between the two, and it is easy to catch the object that deforms downward), then a receiving belt 37 or the like is needed to receive the object (the first conveyor belt 10 and the second conveyor belt 11 are heat-resistant, so their cost is relatively high, while the ordinary external conveyor belt 38 has a lower cost and is used for conveying to a farther distance outward. In this application, the lengths of the receiving belt 37 and the external conveyor belt 38 are for illustration only and do not represent the actual situation).

[0051] After the object to be dried or baked is sent out from the end of the second conveyor belt 11, the object is still supported by the first conveyor belt 10 at this time, so it can be normally conveyed downstream; since the upstream end of the receiving belt 37 is lower than the first conveyor belt 10 and is in an interleaved state with the first conveyor belt 10, the object can transition from the first conveyor belt 10 to the receiving belt 37 and is conveyed upward by the receiving belt 37; the fifth conveying rod 29, the sixth conveying rod 30, the seventh conveying rod 31 and the eighth conveying rod 32 are all externally connected to corresponding motors. After the object is transitioned by the receiving belt 37 and conveyed upward, the object is separated from the first conveyor belt 10; the object continues to move downstream and can transition from the receiving belt 37 to the external conveyor belt 38 when it is transported onto the external conveyor belt 38, and then is conveyed downstream by the external conveyor belt 38. If a relatively soft object is transported, it is preferably to design the receiving belt 37, the external conveyor belt 38, etc. to be relatively dense, so as to better prevent the object from deforming. If the structure of the object is not very stable just after heating and drying, the receiving belt 37 and the external conveyor belt 38 can also be used for transition transmission, and the arc of the receiving belt 37 can be designed to be larger and the span can be designed to be wider according to the actual situation (only for illustration in the figure), and the receiving belt 37 can receive the object on the first conveyor belt 10 in a state close to horizontal and transfer the object to the external conveyor belt 38 in a state close to horizontal.

[0052] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the field of the present invention based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A tunnel oven, characterized in that, Including: An oven main body (1), through openings are provided at both ends of the oven main body (1); A first conveyor rack (2), a second conveyor rack (3), a third conveyor rack (4) and a fourth conveyor rack (5) arranged in sequence. There are two of each of the first conveyor rack (2), the second conveyor rack (3), the third conveyor rack (4) and the fourth conveyor rack (5). A first conveyor rod (6) is horizontally arranged between the two first conveyor racks (2), a second conveyor rod (7) is horizontally arranged between the two second conveyor racks (3), a third conveyor rod (8) is horizontally arranged between the two third conveyor racks (4), and a fourth conveyor rod (9) is horizontally arranged between the two fourth conveyor racks (5). The first conveyor rack (2), the second conveyor rack (3), the third conveyor rack (4) and the fourth conveyor rack (5) are all externally connected to motors; A first conveyor belt (10) and a second conveyor belt (11). The middle parts of the first conveyor belt (10) and the second conveyor belt (11) both movably pass through the through openings on the oven main body (1). There are several of the first conveyor belts (10) and the second conveyor belts (11), and several of the first conveyor belts (10) and the second conveyor belts (11) are arranged in a staggered manner. The tops of the first conveyor belts (10) and the tops of the second conveyor belts (11) are at the same height. The sides of adjacent first conveyor belts (10) and second conveyor belts (11) are in a fitting state. The two ends of the first conveyor belt (10) are respectively wound around the first conveyor rod (6) and the fourth conveyor rod (9), and the two ends of the second conveyor belt (11) are respectively wound around the second conveyor rod (7) and the third conveyor rod (8); A lifting rack (12), the lifting rack (12) is externally connected to a lifting mechanism for controlling the lifting of the lifting rack (12). There are two of the lifting racks (12). All the first conveyor belts (10) are located between the two lifting racks (12). Two lifting rods (13) are horizontally rotatably arranged between the two lifting racks (12). The lifting rods (13) are located between the first conveyor rod (6) and the second conveyor rod (7), and both of the two lifting rods (13) pass through the loop of the first conveyor belt (10); A lifting belt (14). Several lifting belts (14) are rotatably wound around the two lifting rods (13). The projection of the lifting belt (14) in the vertical direction and the projection of the first conveyor belt (10) in the vertical direction are in a staggered state. When the lifting belt (14) is at the highest height, the top of the lifting belt (14) is higher than the top of the first conveyor belt (10). When the conveyor belt is at the lowest height, the top of the conveyor belt is at the same height as the top of the first conveyor belt (10), or the top of the conveyor belt is lower than the top of the first conveyor belt (10).

2. The tunnel oven according to claim 1, characterized in that, The lifting frame (12) includes a horizontal frame (12a) in a horizontal shape and a vertical frame (12b) vertically connected to the middle of the bottom of the horizontal frame (12a). The cross-section of the vertical frame (12b) is rectangular. The two lifting rods (13) are rotatably connected to both ends of the horizontal frame (12a). It further includes a vertical lifting cylinder (15). A vertical groove for active cooperation with the vertical frame (12b) is provided in the middle of the top end of the lifting cylinder (15).

3. A tunnel oven according to claim 2, characterized in that, Linkage parts (16) are horizontally arranged on both sides of the vertical frame (12b). A long vertical hole (17) is vertically formed in the side part of the lifting cylinder (15). The linkage parts (16) are vertically and movably located in the vertical hole (17). The lifting mechanism includes a stop block (18) horizontally arranged on the outer wall of the lifting cylinder (15). An elastic member (19) continuously in a compressed state is arranged between the top of the stop block (18) and the bottom of the linkage part (16).

4. The tunnel oven according to claim 3, characterized in that, The thickness of the lifting belt (14) is greater than the thickness of the first conveyor belt (10). When the top of the linkage part (16) abuts against the top of the vertical hole (17), the lifting belt (14) is at the highest height, and the lifting rod (13) is in a separated state from the first conveyor belt (10).

5. A tunnel oven according to claim 3 or 4, characterized in that, Long strip holes (20) in a long strip shape are vertically formed in the facing sides of the two lifting cylinders (15). An integral rod (21) is horizontally arranged between the two vertical frames (12b). Both ends of the integral rod (21) are respectively movably located in the two long strip holes (20). It further includes a fixed seat (22) with a fixed position. An inclined drive rod (23) is hinged on the fixed seat (22). A hinge rod (24) is hinged in the middle of the drive rod (23). The top of the hinge rod (24) is hinged to the middle of the integral rod (21).

6. A tunnel oven according to claim 1, characterized in that, It further includes a fifth conveyor frame (25), a sixth conveyor frame (26), a seventh conveyor frame (27), and an eighth conveyor frame (28) arranged in sequence. The third conveyor frame (4), the fifth conveyor frame (25), the fourth conveyor frame (5), and the sixth conveyor frame (26) are arranged in sequence. There are two of each of the fifth conveyor frame (25), the sixth conveyor frame (26), the seventh conveyor frame (27), and the eighth conveyor frame (28). A fifth conveyor rod (29) is horizontally arranged between the two fifth conveyor frames (25). A sixth conveyor rod (30) is horizontally arranged between the two sixth conveyor frames (26). A seventh conveyor rod (31) is horizontally arranged between the two seventh conveyor frames (27). An eighth conveyor rod (32) is horizontally arranged between the two eighth conveyor frames (28). Shaping frames (33) are arranged on the tops of the fifth conveyor frame (25), the fourth conveyor frame (5), and the sixth conveyor frame (26). It further includes a first arc-shaped member (34) and a second arc-shaped member (35) with a downwardly open circular arc in the longitudinal section. Both ends of the first arc-shaped member (34) and the second arc-shaped member (35) are fixedly connected to the shaping frame (33). A plurality of relief openings (36) for the first conveyor belt (10) to pass through are formed through the first arc-shaped member (34) and the second arc-shaped member (35). A plurality of receiving belts (37) are movably wound around between the fifth conveyor rod (29) and the seventh conveyor rod (31). The lower side of the receiving belt (37) located on the upper side is movably attached to the upper side of the first arc-shaped member (34), and the lower side of the receiving belt (37) located on the lower side is movably attached to the upper side of the second arc-shaped member (35). A plurality of outer conveyor belts (38) are movably wound around between the sixth conveyor rod (30) and the eighth conveyor rod (32). Both ends of the receiving belt (37) are respectively lower than the first conveyor belt (10) and the outer conveyor belt (38), and both ends of the receiving belt (37) are respectively in an interleaved state with the first conveyor belt (10) and the outer conveyor belt (38).

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