Preheating device for corrugated board processing

Abstract

The utility model discloses a preheating device for corrugated board processing, which belongs to the technical field of corrugated board processing, and comprises a processing table, the rear side of the processing table is fixedly connected with a first support plate, and the top of the first support plate is fixedly connected with a baking assembly. Supporting frames are fixedly connected to the two sides of the top of the machining table correspondingly, heating conveying assemblies are arranged in inner cavities of the supporting frames, and each drying assembly comprises an air heater, a connecting cover, a first flow dividing pipe, an upper flow dividing pipe, an upper connecting pipe, an upper drying cover, a lower flow dividing pipe, a lower connecting pipe and a lower drying cover. The problems that most of existing preheating devices can only preheat one face of a corrugated board, so that heat on the other face is insufficient, the preheating effect is affected, the corrugated board is generally heated through a single heating roller in the prior art, the contact area between the heating roller and the corrugated board is small when the heating roller rolls, and the heating effect is affected are solved. And a single heating roller is difficult to heat the corrugated board to the required temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of corrugated board processing, and particularly relates to a preheating device for corrugated board processing. Background Art

[0002] A corrugated board is a multi-layer adhesive body, which is composed of at least one layer of corrugated core paper sandwich and one layer of cardboard. It has high mechanical strength and can withstand collisions and drops during handling. The actual performance of the corrugated board depends on three factors: the characteristics of the core paper and cardboard, and the structure of the cardboard box itself.

[0003] Currently, a Chinese patent with the publication number CN218489236U discloses a preheating device for corrugated board processing, belonging to the technical field of corrugated board processing. Aiming at the problems of poor preheating processing efficiency of corrugated board and the effect being difficult to meet the needs of workers, it includes a processing box, and the processing box further includes a bottom plate fixed to the bottom side wall of the processing box. Two symmetrically distributed transmission shafts are rotatably connected to the inner side wall of the processing box, and a conveyor belt is sleeved on the outer surface of the transmission shaft. An installation plate is fixed to the processing box, and a driving motor is fixed to the top side wall of the installation plate. The utility model drives the corrugated board to be evenly conveyed through the conveyor belt, and drives the heating plate to move reciprocally with the setting of the reciprocating component, so that compared with the traditional preheating device, the preheating treatment efficiency of the corrugated board of this device is higher, and for workers, the operation is more convenient and the stability is higher, so it can better meet the requirements of the corrugated board preheating treatment work.

[0004] When preheating the corrugated board, a preheating device is needed. Most of the existing preheating devices can only preheat one side of the corrugated board, which will cause insufficient heat on the other side and affect the preheating effect. And currently, the corrugated board is usually heated by a single heating roller. When the heating roller rolls, the contact area with the corrugated board is small, and it is difficult for a single heating roller to heat the corrugated board to the required temperature. Summary of the Utility Model

[0005] The utility model provides a preheating device for corrugated board processing, aiming to solve the problems that most of the existing preheating devices can only preheat one side of the corrugated board, which will cause insufficient heat on the other side and affect the preheating effect, and currently, the corrugated board is usually heated by a single heating roller. When the heating roller rolls, the contact area with the corrugated board is small, and it is difficult for a single heating roller to heat the corrugated board to the required temperature.

[0006] The present utility model is realized as follows. A preheating device for corrugated cardboard processing includes a processing table. A first support plate is fixedly connected to the rear side of the processing table. A heating component is fixedly connected to the top of the first support plate. Support frames are fixedly connected to both sides of the top of the processing table. A heating and conveying component is arranged inside the support frames.

[0007] The heating component includes a hot air blower, a connection cover, a first shunt pipe, an upper shunt pipe, an upper connection pipe, an upper baking cover, a lower shunt pipe, a lower connection pipe, and a lower baking cover. The bottom of the hot air blower is fixedly connected to the top of the first support plate. The rear side of the connection cover is communicated with the air outlet of the hot air blower. The rear side of the first shunt pipe is communicated with the front side of the connection cover. The bottom of the upper shunt pipe is communicated with the top of the first shunt pipe. One end of the upper connection pipe is communicated with the front side of the upper shunt pipe. The top of the upper baking cover is communicated with the other end of the upper connection pipe. The top of the lower shunt pipe is communicated with the bottom of the first shunt pipe. The bottom of the lower shunt pipe is fixedly connected to the rear side of the top of the processing table. One end of the lower connection pipe is communicated with the front side of the lower shunt pipe. The bottom of the lower baking cover is communicated with the other end of the lower connection pipe.

[0008] In order to achieve the effect of conveying the corrugated cardboard and heating both sides of the corrugated cardboard simultaneously, as a preferred embodiment of the preheating device for corrugated cardboard processing of the present utility model, the heating and conveying component includes a second support plate, a driving motor, a first driving rod, a first heating transmission roller, a pneumatic telescopic rod, a connection frame, a second driving rod, and a second heating transmission roller. The rear side of the second support plate is fixedly connected to the front side of the support frame. The bottom of the driving motor is fixedly connected to the top of the second support plate. The front side of the first driving rod is fixedly connected to the output end of the driving motor. The rear side of the first driving rod penetrates to the rear side of the support frame. The first heating transmission roller is sleeved on the surface of the first driving rod. The inner wall of the first heating transmission roller is fixedly connected to the surface of the first driving rod. The bottom of the pneumatic telescopic rod is fixedly connected to the top of the support frame. The output end of the pneumatic telescopic rod penetrates to the inside of the support frame. The top of the connection frame is fixedly connected to the output end of the pneumatic telescopic rod. The front side and the rear side of the second driving rod respectively penetrate to the front side and the rear side of the connection frame. The second heating transmission roller is sleeved on the surface of the second driving rod. The inner wall of the second heating transmission roller is fixedly connected to the surface of the second driving rod.

[0009] In order to achieve the effect of supporting the processing table and assisting in supporting the first support plate, as a preferred embodiment of the preheating device for corrugated cardboard processing of the present utility model, first support legs are fixedly connected to the front side and the rear side of both sides of the bottom of the processing table. Second support legs are fixedly connected to both sides of the rear side of the first support plate.

[0010] In order to achieve the effect of increasing the heating area of the top and bottom of the corrugated board, preferably as a preheating device for corrugated board processing of the present utility model, the number of the upper connecting pipes and the upper baking covers is five, and they are evenly distributed on the front side of the upper shunt pipe. The number of the lower connecting pipes and the lower baking covers is five, and they are evenly distributed on the front side of the lower shunt pipe.

[0011] In order to achieve the effect of increasing the support stability of the driving motor by the second support plate, preferably as a preheating device for corrugated board processing of the present utility model, a reinforcing rib is fixedly connected to the front side of the bottom of the second support plate, and the side of the reinforcing rib close to the support frame is fixedly connected to the support frame.

[0012] In order to achieve the effect that the first driving rod can pass through the support frame and is convenient to rotate through the bearing, preferably as a preheating device for corrugated board processing of the present utility model, first moving holes for cooperating with the first driving rod are respectively formed in the front side and the rear side of the support frame, and one side of the surface of the first driving rod close to the inner wall of the first moving hole is rotationally connected to the inner wall of the first moving hole through a bearing.

[0013] In order to achieve the effect of limiting the connecting frame and preventing the connecting frame from shaking, preferably as a preheating device for corrugated board processing of the present utility model, limiting rods are respectively fixedly connected to the front side and the rear side of the top of the connecting frame. The tops of the limiting rods penetrate to the top of the support frame. Through holes for cooperating with the limiting rods are respectively formed in the front side and the rear side of the inner wall of the top of the support frame, and the surface of the limiting rod is slidably connected to the inner wall of the through hole.

[0014] In order to achieve the effect that the second driving rod can pass through the connecting frame and is convenient to rotate through the bearing, preferably as a preheating device for corrugated board processing of the present utility model, second moving holes for cooperating with the second driving rod are respectively formed in the front side and the rear side of the inner wall of the connecting frame, and one side of the surface of the second driving rod close to the inner wall of the second moving hole is rotationally connected to the inner wall of the second moving hole through a bearing.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] The preheating device for corrugated board processing is provided with a processing table, a first support plate, a heating component, a support frame and a heating and conveying component. When in use, the corrugated board is inserted into the heating and conveying component on the right side of the top of the processing table, then passes through the heating component, and then passes out from the heating and conveying component on the left side of the top of the processing table. Then, the two heating and conveying components are started to clamp the corrugated board. After clamping, the two heating and conveying components are started to convey the corrugated board and heat both sides of the corrugated board simultaneously. During the conveying process, the heating component is started, and the heating component will heat both sides of the corrugated board simultaneously, thereby achieving the effect of heating both sides of the corrugated board simultaneously, and multiple heating of the corrugated board is carried out through the two heating and conveying components and the heating component, improving the heating effect. Description of the Drawings

[0017] Figure 1 is the overall structure diagram of the preheating device for corrugated board processing of the present utility model;

[0018] Figure 2 In the present utility model Figure 1 front view structure diagram;

[0019] Figure 3 In the present utility model Figure 1 left view structure diagram;

[0020] Figure 4 is the structure diagram of the heating component in the present utility model;

[0021] Figure 5 is the exploded structure diagram of the heating and conveying component and the support frame in the present utility model.

[0022] In the figure, 1. Processing table; 2. First support plate; 3. Heating component; 301. Hot air blower; 302. Connecting cover; 303. First shunt pipe; 304. Upper shunt pipe; 305. Upper connecting pipe; 306. Upper baking cover; 307. Lower shunt pipe; 308. Lower connecting pipe; 309. Lower baking cover; 4. Support frame; 5. Heating and conveying component; 501. Second support plate; 502. Driving motor; 503. First driving rod; 504. First heating transmission roller; 505. Pneumatic telescopic rod; 506. Connecting frame; 507. Second driving rod; 508. Second heating transmission roller; 6. First support leg; 7. Second support leg; 8. Reinforcing rib; 9. First movable hole; 10. Limiting rod; 11. Through hole; 12. Second movable hole. Detailed Embodiments

[0023] In order to make the objectives, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, in the description of the present utility model, the meaning of "a plurality of" is two or more unless otherwise specifically defined.

[0025] Please refer to Figures 1-5 , the present utility model provides a technical solution: a preheating device for corrugated cardboard processing, including a processing table 1, a first support plate 2 is fixedly connected to the rear side of the processing table 1, a heating component 3 is fixedly connected to the top of the first support plate 2, and support frames 4 are fixedly connected to both sides of the top of the processing table 1. A heating and conveying component 5 is arranged in the inner cavity of the support frame 4;

[0026] The heating component 3 includes a hot air blower 301, a connecting cover 302, a first shunt pipe 303, an upper shunt pipe 304, an upper connecting pipe 305, an upper baking cover 306, a lower shunt pipe 307, a lower connecting pipe 308 and a lower baking cover 309. The bottom of the hot air blower 301 is fixedly connected to the top of the first support plate 2. The rear side of the connecting cover 302 is communicated with the air outlet of the hot air blower 301. The rear side of the first shunt pipe 303 is communicated with the front side of the connecting cover 302. The bottom of the upper shunt pipe 304 is communicated with the top of the first shunt pipe 303. One end of the upper connecting pipe 305 is communicated with the front side of the upper shunt pipe 304. The top of the upper baking cover 306 is communicated with the other end of the upper connecting pipe 305. The top of the lower shunt pipe 307 is communicated with the bottom of the first shunt pipe 303. The bottom of the lower shunt pipe 307 is fixedly connected to the rear side of the top of the processing table 1. One end of the lower connecting pipe 308 is communicated with the front side of the lower shunt pipe 307. The bottom of the lower baking cover 309 is communicated with the other end of the lower connecting pipe 308.

[0027] In this embodiment: By providing a processing table 1, a first support plate 2, a heating component 3, a support frame 4, and a heating and conveying component 5, during use, the corrugated cardboard is inserted through the heating and conveying component 5 on the right side of the top of the processing table 1, then passes through the heating component 3, and then exits from the heating and conveying component 5 on the left side of the top of the processing table 1. Then, the two heating and conveying components 5 are started to clamp the corrugated cardboard. After clamping, the two heating and conveying components 5 are started to convey the corrugated cardboard and simultaneously heat both sides of the corrugated cardboard. During the conveying process, the heating component 3 is started, and the heating component 3 will simultaneously heat both sides of the corrugated cardboard, thereby achieving the effect of being able to simultaneously heat both sides of the corrugated cardboard. Moreover, the corrugated cardboard is heated multiple times by the two heating and conveying components 5 and the heating component 3, improving the heating effect.

[0028] As a technical optimization solution of the present utility model, the heating and conveying component 5 includes a second support plate 501, a driving motor 502, a first transmission rod 503, a first heating transmission roller 504, a pneumatic telescopic rod 505, a connecting frame 506, a second transmission rod 507, and a second heating transmission roller 508. The rear side of the second support plate 501 is fixedly connected to the front side of the support frame 4. The bottom of the driving motor 502 is fixedly connected to the top of the second support plate 501. The front side of the first transmission rod 503 is fixedly connected to the output end of the driving motor 502. The rear side of the first transmission rod 503 penetrates to the rear side of the support frame 4. The first heating transmission roller 504 is sleeved on the surface of the first transmission rod 503, and the inner wall of the first heating transmission roller 504 is fixedly connected to the surface of the first transmission rod 503. The bottom of the pneumatic telescopic rod 505 is fixedly connected to the top of the support frame 4. The output end of the pneumatic telescopic rod 505 penetrates to the inner cavity of the support frame 4. The top of the connecting frame 506 is fixedly connected to the output end of the pneumatic telescopic rod 505. The front side and the rear side of the second transmission rod 507 respectively penetrate to the front side and the rear side of the connecting frame 506. The second heating transmission roller 508 is sleeved on the surface of the second transmission rod 507, and the inner wall of the second heating transmission roller 508 is fixedly connected to the surface of the second transmission rod 507.

[0029] In this embodiment: By providing a second support plate 501, a drive motor 502, a first drive rod 503, a first heating transfer roller 504, a pneumatic telescopic rod 505, a connecting frame 506, a second drive rod 507, and a second heating transfer roller 508, during use, the corrugated board is passed between the first heating transfer roller 504 and the second heating transfer roller 508, and then the pneumatic telescopic rod 505 is activated. The output end of the pneumatic telescopic rod 505 drives the connecting frame 506 to move downward. The connecting frame 506 drives the second drive rod 507 to move downward, and the second drive rod 507 drives the second heating transfer roller 508 to move downward, causing the second heating transfer roller 508 and the first heating transfer roller 504 to clamp the corrugated board. Then, the drive motor 502 is activated. The drive motor 502 drives the first drive rod 503 to rotate, and the first drive rod 503 drives the first heating transfer roller 504 to rotate. At this time, the second heating transfer roller 508 will rotate in the opposite direction, thereby conveying the corrugated board. And during the conveying process, the first heating transfer roller 504 heats the bottom of the corrugated board, and the second heating transfer roller 508 heats the top of the corrugated board, thus achieving the effect of simultaneously heating both sides of the corrugated board during the transmission process.

[0030] As a technical optimization solution of the present utility model, first support legs 6 are fixedly connected to the front side and the rear side of both sides of the bottom of the processing table 1, and second support legs 7 are fixedly connected to both sides of the rear side of the first support plate 2.

[0031] In this embodiment: By providing the first support legs 6, the processing table 1 can be supported. By providing the second support legs 7, the first support plate 2 can be supported assistingly.

[0032] As a technical optimization solution of the present utility model, the number of the upper connecting pipes 305 and the upper baking hoods 306 is five, and they are evenly distributed on the front side of the upper shunt pipe 304. The number of the lower connecting pipes 308 and the lower baking hoods 309 is five, and they are evenly distributed on the front side of the lower shunt pipe 307.

[0033] In this embodiment: By providing a plurality of upper connecting pipes 305 and upper baking hoods 306, the baking area on the top of the corrugated board can be increased. By providing a plurality of lower connecting pipes 308 and lower baking hoods 309, the baking area on the bottom of the corrugated board can be increased.

[0034] As a technical optimization solution of the present utility model, a reinforcing rib 8 is fixedly connected to the front side of the bottom of the second support plate 501, and the side of the reinforcing rib 8 close to the support frame 4 is fixedly connected to the support frame 4.

[0035] In this embodiment: By providing the reinforcing rib 8, the support stability of the second support plate 501 for the drive motor 502 can be increased.

[0036] As a technical optimization solution of the present utility model, first moving holes 9 adapted for use with the first transmission rod 503 are formed in the front side and the rear side of the support frame 4, and one side of the surface of the first transmission rod 503 close to the inner wall of the first moving hole 9 is rotatably connected to the inner wall of the first moving hole 9 through a bearing.

[0037] In this embodiment: By providing the first moving holes 9, it is to enable the first transmission rod 503 to pass through the support frame 4 and facilitate rotation through the bearing.

[0038] As a technical optimization solution of the present utility model, limiting rods 10 are fixedly connected to the front side and the rear side of the top of the connecting frame 506, the tops of the limiting rods 10 penetrate to the top of the support frame 4, and through holes 11 adapted for use with the limiting rods 10 are formed in the front side and the rear side of the inner wall top of the support frame 4, and the surface of the limiting rod 10 is slidably connected to the inner wall of the through hole 11.

[0039] In this embodiment: By providing the limiting rods 10, the connecting frame 506 can be limited to prevent the connecting frame 506 from shaking. By providing the through holes 11, it is to enable the limiting rods 10 to move up and down.

[0040] As a technical optimization solution of the present utility model, second moving holes 12 adapted for use with the second transmission rod 507 are formed in the front side and the rear side of the inner wall of the connecting frame 506, and one side of the surface of the second transmission rod 507 close to the inner wall of the second moving hole 12 is rotatably connected to the inner wall of the second moving hole 12 through a bearing.

[0041] In this embodiment: By providing the second moving holes 12, it is to enable the second transmission rod 507 to pass through the connecting frame 506 and facilitate rotation through the bearing.

[0042] Working principle: First, the corrugated cardboard is threaded through between the first heating transfer roller 504 and the second heating transfer roller 508 on the right side of the top of the processing table 1, then through between the upper baking hood 306 and the lower baking hood 309, then out through between the first heating transfer roller 504 and the second heating transfer roller 508 on the left side of the top of the processing table 1. Then, the corrugated cardboard is straightened. Then, the pneumatic telescopic rods 505 on both sides of the top of the processing table 1 are started simultaneously. The output end of the pneumatic telescopic rod 505 drives the connecting frame 506 to move downward. The connecting frame 506 drives the second transmission rod 507 to move downward. The second transmission rod 507 drives the second heating transfer roller 508 to move downward, so that the second heating transfer roller 508 and the first heating transfer roller 504 clamp the corrugated cardboard. Then, the driving motor 502 is started. The driving motor 502 drives the first transmission rod 503 to rotate. The first transmission rod 503 drives the first heating transfer roller 504 to rotate. At this time, the second heating transfer roller 508 will rotate in the opposite direction, thereby conveying the corrugated cardboard. And during the conveying process, the first heating transfer roller 504 heats the bottom of the corrugated cardboard, and the second heating transfer roller 508 heats the top of the corrugated cardboard, thus achieving the effect of simultaneously heating both sides of the corrugated cardboard during the transmission process. And during the transmission process, the hot air blower 301 is started. The hot air blower 301 outputs hot air, which then enters the upper shunt pipe 304 and the lower shunt pipe 307 through the connecting cover 302 and the first shunt pipe 303. Then, it enters the upper connecting pipe 305 and the lower connecting pipe 308 through the upper shunt pipe 304 and the lower shunt pipe 307 respectively. Then, the upper baking hood 306 and the lower baking hood 309 simultaneously heat both sides of the corrugated cardboard, thus achieving the effect of simultaneously heating both sides of the corrugated cardboard. And through the two groups of the first heating transfer roller 504 and the second heating transfer roller 508 and the multiple upper baking hoods 306 and lower baking hoods 309, the corrugated cardboard can be heated multiple times, improving the heating effect.

[0043] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preheating device for corrugated board processing, comprising a processing table (1), characterized in that: A first support plate (2) is fixedly connected to the rear side of the processing table (1), a heating component (3) is fixedly connected to the top of the first support plate (2), support frames (4) are fixedly connected to both sides of the top of the processing table (1), and a heating and conveying component (5) is provided in the inner cavity of the support frame (4); The heating assembly (3) comprises a hot air blower (301), a connecting cover (302), a first flow divider (303), an upper flow divider (304), an upper connecting pipe (305), an upper drying cover (306), a lower flow divider (307), a lower connecting pipe (308) and a lower drying cover (309); the bottom of the hot air blower (301) is fixedly connected to the top of the first support plate (2); the rear side of the connecting cover (302) is connected to the air outlet of the hot air blower (301); the rear side of the first flow divider (303) is connected to the front side of the connecting cover (302); the bottom of the upper flow divider (304 ... The upper connecting pipe (305) is connected to the top of the first diverter pipe (303), one end of the upper connecting pipe (305) is connected to the front side of the upper diverter pipe (304), the top of the upper drying hood (306) is connected to the other end of the upper connecting pipe (305), the top of the lower diverter pipe (307) is connected to the bottom of the first diverter pipe (303), the bottom of the lower diverter pipe (307) is fixedly connected to the rear side of the top of the processing table (1), one end of the lower connecting pipe (308) is connected to the front side of the lower diverter pipe (307), and the bottom of the lower drying hood (309) is connected to the other end of the lower connecting pipe (308).

2. A preheating device for corrugated cardboard processing according to claim 1, characterized in that: The heating and conveying assembly (5) comprises a second support plate (501), a transmission motor (502), a first transmission rod (503), a first heating and conveying roller (504), a pneumatic telescopic rod (505), a connecting frame (506), a second transmission rod (507) and a second heating and conveying roller (508), the rear side of the second support plate (501) is fixedly connected to the front side of the support frame (4), the bottom of the transmission motor (502) is fixedly connected to the top of the second support plate (501), the front side of the first transmission rod (503) is fixedly connected to the output end of the transmission motor (502), the rear side of the first transmission rod (503) passes through the rear side of the support frame (4), and the first heating and conveying roller (504) is sleeved on the second transmission rod (507). The surface of a transmission rod (503), the inner wall of the first heating transmission roller (504) is fixedly connected to the surface of the first transmission rod (503), the bottom of the pneumatic telescopic rod (505) is fixedly connected to the top of the support frame (4), the output end of the pneumatic telescopic rod (505) passes through the inner cavity of the support frame (4), the top of the connecting frame (506) is fixedly connected to the output end of the pneumatic telescopic rod (505), the front side and the rear side of the second transmission rod (507) respectively pass through the front side and the rear side of the connecting frame (506), the second heating transmission roller (508) is sleeved on the surface of the second transmission rod (507), and the inner wall of the second heating transmission roller (508) is fixedly connected to the surface of the second transmission rod (507).

3. A preheating device for corrugated cardboard processing according to claim 1, characterized in that: The front and rear sides of both sides of the bottom of the processing table (1) are fixedly connected to first supporting legs (6), and the rear sides of the first supporting plate (2) are fixedly connected to second supporting legs (7).

4. A preheating device for corrugated cardboard processing according to claim 1, characterized in that: The number of the upper connecting pipes (305) and the upper drying hoods (306) is five and they are evenly distributed on the front side of the upper diverter pipe (304); the number of the lower connecting pipes (308) and the lower drying hoods (309) is five and they are evenly distributed on the front side of the lower diverter pipe (307).

5. A preheating device for corrugated cardboard processing according to claim 2, characterized in that: A reinforcing rib (8) is fixedly connected to the front side of the bottom of the second support plate (501), and the reinforcing rib (8) is fixedly connected to the support frame (4) on a side close to the support frame (4).

6. A preheating device for corrugated board processing according to claim 2, characterized in that: The front and rear sides of the support frame (4) are both provided with a first movable hole (9) for use with the first transmission rod (503); a side of the surface of the first transmission rod (503) close to the inner wall of the first movable hole (9) is rotatably connected to the inner wall of the first movable hole (9) via a bearing.

7. A preheating device for corrugated board processing according to claim 2, characterized in that: The front and rear sides of the top of the connecting frame (506) are fixedly connected to a limiting rod (10), the top of the limiting rod (10) passes through the top of the supporting frame (4), and the front and rear sides of the top of the inner wall of the supporting frame (4) are provided with a through hole (11) for use with the limiting rod (10), and the surface of the limiting rod (10) is slidably connected to the inner wall of the through hole (11).

8. A preheating device for corrugated board processing according to claim 2, characterized in that: The front and rear sides of the inner wall of the connecting frame (506) are both provided with a second movable hole (12) for use with the second transmission rod (507); the side of the surface of the second transmission rod (507) close to the inner wall of the second movable hole (12) is rotatably connected to the inner wall of the second movable hole (12) via a bearing.

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