Preheating oven mechanism

Abstract

The invention discloses a preheating oven mechanism, and belongs to the field of film coating equipment. The device comprises a box body and a conveying assembly arranged in the box body. A pair of first partition plates are horizontally fixed in the box body side by side; the two first partition plates are connected through a second partition plate; hot air chambers are respectively formed between the two first partition plates and the top wall and the bottom wall of the box body; a preheating chamber is formed among the two first partition plates, the front side wall of the box body and the second partition plate; the opposite side faces of the two first partition plates are each provided with a plurality of air blowing openings used for communicating the hot air cavity with the preheating cavity side by side. The conveying assembly comprises a plurality of first conveying rollers arranged side by side and a plurality of second conveying rollers parallel to the first conveying rollers. The two ends of the first conveying rollers and the two ends of the second conveying rollers are rotationally connected to the front side wall of the box body and the second partition plate correspondingly. And hot air in the hot air chamber is vertically blown into the preheating chamber through the air blowing opening, so that the preheating effect of the film can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of thin film coating equipment, and in particular to a preheating oven mechanism for thin film production and processing. Background Technology

[0002] Film preheating ovens are commonly used equipment in key processes of film production and subsequent processing (such as coating, lamination, printing, etc.). Their main function is to preheat the substrate film to remove surface-adsorbed moisture and low-molecular-weight volatiles, increase the film temperature, and improve its surface properties and dimensional stability, thereby ensuring the quality and efficiency of subsequent processes (such as coating adhesion and material lamination).

[0003] Chinese Patent No. CN222343341U discloses a film preheating box. During the film conveying process by the conveyor rollers, a heating component heats the air inside the box. Air-driving components located on the upper and lower sides of the box drive the hot air flow within the box. The hot air then passes through hot air ducts spaced apart by a uniform air distribution component, and is blown out and flows through the film, thereby preheating it. The above device has the following drawbacks: (Refer to the attached instruction manual for the above device). Figure 1 As shown, the hot air in the above device flows along the axial direction of the conveying roller, that is, the hot air flows from one edge of the film to the other edge. Since one edge of the film is always close to the heating component, the heating temperature of one edge of the film is always greater than that of the other edge. This will either cause the one edge of the film to be damaged due to the high heating temperature, or cause insufficient preheating of the other edge of the film, thus affecting the preheating effect of the film.

[0004] Therefore, there is an urgent need to study a preheating oven mechanism in order to solve the above problems. Summary of the Invention

[0005] This invention provides a preheating oven mechanism that can solve technical problems such as poor film preheating effect in the prior art.

[0006] A preheating oven mechanism includes a box body and a conveying assembly installed inside the box body; the opposite side walls of the box body are provided with inlets and outlets; a pair of first partitions are horizontally fixed side by side inside the box body from top to bottom; the two first partitions are connected by a second partition parallel to the front side wall of the box body; the two first partitions form hot air chambers with the top and bottom walls of the box body respectively; a preheating chamber connected to the inlet and outlet is formed between the two first partitions, the front side wall of the box body, and the second partition; multiple air blowers for connecting the hot air chamber and the preheating chamber are provided side by side on the opposite sides of the two first partitions. Air vent; the conveying assembly includes multiple first conveying rollers arranged side by side and multiple second conveying rollers that are parallel to the first conveying rollers; the two ends of the multiple first conveying rollers and the two ends of the multiple second conveying rollers are respectively rotatably connected to the front side wall of the housing and the second partition, and the multiple second conveying rollers are all arranged above the first conveying rollers; a first conveying roller is arranged on both sides of any air vent on a first partition near the first conveying roller; a second conveying roller is arranged on both sides of any air vent on another first partition near the second conveying roller.

[0007] As a preferred embodiment of the present invention, guide components are provided on the outer sides of both inlets and outlets; the guide components include a pair of bearing blocks respectively fixed on the opposite sides of the inlets and outlets; a pair of guide rollers are rotatably connected side by side from top to bottom between the two bearing blocks; a film conveying gap is formed between the two guide rollers.

[0008] As a preferred embodiment of the present invention, a heating chamber is formed between the two first partitions, the rear side wall of the box and the second partition; a heating component is installed in the heating chamber; multiple vertically arranged connecting cylinders are fixedly inserted side by side on the opposite sides of the two first partitions; the connecting cylinders can transport hot air from the heating chamber to the hot air chamber through their inner cavities.

[0009] As a preferred embodiment of the present invention, the heating assembly includes a pair of support seats fixed side by side on the rear side wall of the housing; and a plurality of electric heating rods are horizontally fixed side by side between the two support seats from top to bottom.

[0010] As a preferred embodiment of the present invention, a pair of mounting cylinders are fixed side by side on the rear side wall of the housing; the inner cavities of the two mounting cylinders are connected to the heating chamber; a first fan is fixed inside the two mounting cylinders; the air outlets of the two first fans are horizontally directed towards the heating assembly.

[0011] As a preferred embodiment of the present invention, a second fan is horizontally fixed inside each of the plurality of connecting cylinders; the air inlet of any one of the second fans points towards the heating chamber.

[0012] As a preferred embodiment of the present invention, both hot air chambers are provided with guide plates that are inclined and correspond to the connecting cylinders; one edge of each guide plate is fixed to the rear side wall of the housing; the other edge of each guide plate is fixed to the top and bottom walls of the housing, respectively.

[0013] As a preferred embodiment of the present invention, a return air chamber communicating with the heating chamber is provided in each of the plurality of first conveying rollers and the plurality of second conveying rollers, and a plurality of negative pressure holes communicating with the return air chamber are arranged side by side on the circumferential sidewalls of the plurality of first conveying rollers and the plurality of second conveying rollers.

[0014] As a preferred embodiment of the present invention, a pair of third partitions are horizontally fixed between the two first partitions from top to bottom; negative pressure chambers are formed between the two third partitions, the rear side wall of the housing, the second partition, and the two first partitions; one end of each of the plurality of first conveying rollers and one end of each of the plurality of second conveying rollers are rotatably connected to a movable joint; each of the plurality of movable joints is connected to an air supply pipe; one end of each air supply pipe on each of the plurality of first conveying rollers is connected to a third partition, and the return air chambers of the plurality of first conveying rollers are connected to a negative pressure chamber through the air supply pipes; one end of each air supply pipe on each of the plurality of second conveying rollers is connected to another third partition, and the return air chambers of the plurality of second conveying rollers are connected to another negative pressure chamber through the air supply pipes.

[0015] As a preferred embodiment of the present invention, multiple third fans corresponding to the negative pressure chambers are arranged side by side on the opposite sides of the two first partitions, and the multiple third fans are bolted to the two first partitions respectively; the third fans are used to draw the hot air in the negative pressure chamber to the hot air chamber adjacent to the negative pressure chamber.

[0016] As a preferred embodiment of the present invention, each of the multiple air outlets has a horizontally fixed air distribution plate at its outlet end; and each of the multiple air distribution plates has multiple through holes arranged in parallel vertically on its upper surface.

[0017] This invention provides a preheating oven mechanism. A film is conveyed from an inlet / outlet to a preheating chamber, and the film is alternately conveyed by multiple first conveying rollers and multiple second conveying rollers. Simultaneously, hot air from the hot air chamber is vertically blown into the preheating chamber through air vents. Because a first conveying roller is positioned on each side of any air vent on a first partition near the first conveying roller, and a second conveying roller is positioned on each side of any air vent on another first partition near the second conveying roller, the hot air discharged from the air vents can be vertically blown onto the film surface between any two adjacent first conveying rollers and between any two adjacent second conveying rollers. This not only increases the heated area of ​​the film but also effectively improves the preheating efficiency. Furthermore, since the film is dynamically conveyed within the oven, problems such as uneven local heating of the film are greatly reduced, ensuring uniform heating of the film. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a preheating oven mechanism provided by the present invention.

[0019] Figure 2 for Figure 1 The main view of the structure.

[0020] Figure 3 for Figure 1 A structural side view.

[0021] Figure 4 for Figure 3 Cross-sectional view of the structure along the AA direction.

[0022] Figure 5 This is a schematic diagram of the connection between the first partition and the second partition of the present invention.

[0023] Figure 6 This is a schematic diagram of the heating component of the present invention disposed inside the box.

[0024] Figure 7 This is a schematic diagram of the conveying assembly of the present invention.

[0025] Figure 8 This is a schematic diagram of the structure of the guide component of the present invention.

[0026] Explanation of reference numerals in the attached figures: 1-Box body, 2-Conveying assembly, 3-Guiding assembly, 4-Heating assembly, 5-Mounting cylinder, 6-Second fan, 7-Guide plate, 8-Air distribution plate, 9-Third fan, 101-Inlet / outlet, 102-First partition, 103-Second partition, 104-Hot air chamber, 105-Preheating chamber, 106-Air outlet, 107-Heating chamber, 108-Connecting cylinder, 109-Third partition, 110-Negative pressure chamber, 201-First conveying roller, 202-Second conveying roller, 203-Return air chamber, 204-Negative pressure hole, 205-Modible joint, 206-Air duct, 301-Bearing block, 302-Guiding roller, 401-Support base, 402-Electric heating rod, 501-First fan, 801-Through hole. Detailed Implementation

[0027] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0028] Example 1: like Figures 1-5As shown in the figure, a preheating oven mechanism provided in this embodiment of the invention includes a box body 1 and a conveying assembly 2 installed inside the box body 1; the opposite side walls of the box body 1 are provided with rectangular inlet and outlet 101; a pair of first partitions 102 are horizontally welded side by side from top to bottom inside the box body 1; the two first partitions 102 are connected by a second partition 103 parallel to the front side wall of the box body 1, and the second partition 103 is welded inside the box body 1; the two first partitions 102 form hot air chambers 104 with the top wall and bottom wall of the box body 1 respectively; the two first partitions 102, the front side wall of the box body 1 and the second partition 103 form a connection with the inlet and outlet 101. A preheating chamber 105 is connected to the preheating chamber 105; the preheating chamber 105 is located between two hot air chambers 104, and the hot air chambers 104 and the preheating chamber 105 are independent of each other; multiple air outlets 106 for connecting the hot air chambers 104 and the preheating chamber 105 are arranged side by side on the opposite sides of the two first partitions 102, that is, the hot air in the hot air chamber 104 enters the preheating chamber 105 through the air outlets 106; the conveying assembly 2 includes multiple first conveying rollers 201 arranged side by side and multiple second conveying rollers 202 that are parallel to the first conveying rollers 201; the two ends of the multiple first conveying rollers 201 and the multiple second conveying rollers 202 are connected to the preheating chamber 105. Both ends are rotatably connected to the front side wall of the housing 1 and the second partition 103, respectively, and multiple second conveying rollers 202 are all arranged above the first conveying rollers 201; a first conveying roller 201 is arranged on both sides of any air outlet 106 on a first partition 102 near the first conveying roller 201, that is, an air outlet 106 on a first partition 102 is arranged between any two adjacent first conveying rollers 201; a second conveying roller 202 is arranged on both sides of any air outlet 106 on another first partition 102 near the second conveying roller 202, that is, a second conveying roller 202 is arranged between any two adjacent second conveying rollers 202. An air outlet 106 is provided on another first partition 102; specifically, the distance between any two adjacent first conveying rollers 201 is equal to the distance between any two adjacent second conveying rollers 202, the diameter and length of the first conveying roller 201 are consistent with the diameter and length of the second conveying roller 202, and the distance between any two adjacent first conveying rollers 201 is greater than the diameter of the first conveying roller 201. This design enables the film to have a V-shaped conveying profile when the film is conveyed between the first conveying roller 201 and the second conveying roller 202, thereby increasing the heating area of ​​the film and further improving the preheating efficiency of the film.The film is conveyed from an inlet / outlet 101 to a preheating chamber 105, and the film is alternately conveyed by multiple first conveying rollers 201 and multiple second conveying rollers 202. At the same time, hot air from the hot air chamber 104 is vertically blown into the preheating chamber 105 through air outlets 106. Due to the design, a first conveying roller 201 is provided on each side of any air outlet 106 on a first partition 102 near the first conveying roller 201, and a second conveying roller is provided on each side of any air outlet 106 on another first partition 102 near the second conveying roller 202. 202, so the hot air discharged from the air outlet 106 can be blown vertically onto the surface of the film section between any two adjacent first conveying rollers 201 and between any two adjacent second conveying rollers 202, thereby not only increasing the heated area of ​​the film, but also effectively improving the preheating efficiency of the film. Since the film is dynamically conveyed in the box 1 and the hot air is blown directly onto the film, the problem of uneven local heating of the film is greatly reduced, ensuring the uniformity of film heating. The preheated film is discharged from the box 1 through another inlet 101, ensuring the production efficiency of the film.

[0029] Among them, such as Figures 1-2 and Figure 8 As shown, to ensure the film conveying effect, guide components 3 are installed on the opposite outer sides of both inlet and outlet 101. Each guide component 3 includes a pair of support blocks 301 bolted to the opposite sides of the inlet and outlet 101. A pair of guide rollers 302 are rotatably connected side-by-side between the two support blocks 301 from top to bottom. A film conveying gap is formed between the two guide rollers 302. By conveying the film through the film conveying gap between the two guide rollers 302, the film conveying effect can be guaranteed.

[0030] Example 2: Based on Example 1, as follows Figures 2-4 and Figure 6As shown, a heating chamber 107 is formed between the two first partitions 102, the rear side wall of the housing 1, and the second partition 103. A heating assembly 4 is installed inside the heating chamber 107. Multiple vertically arranged connecting cylinders 108 are fixedly inserted side-by-side on opposite sides of the two first partitions 102. The connecting cylinders 108 can transport hot air from the heating chamber 107 to the hot air chamber 104 through their inner cavities. Heat is generated in the heating chamber 107 by the heating assembly 4, and then the heat in the heating chamber 107 is transported to the hot air chamber 104 through the inner cavities of the connecting cylinders 108, effectively ensuring the preheating efficiency of the membrane. Specifically, the heating assembly 4 includes a pair of support seats 401 bolted side-by-side to the rear side wall of the housing 1; multiple conventional electric heating rods 402 are horizontally bolted side-by-side between the two support seats 401 from top to bottom. Designed based on the principle of electrothermal generation, the electric heating rod 402 generates heat during operation, which raises the temperature inside the heating chamber 107, ensuring the heating effect and avoiding problems such as slow or insufficient heat generation, thus guaranteeing the preheating effect of the thin film.

[0031] Among them, such as Figures 3-4 and Figure 6 As shown, to accelerate the entry of heat into the heating chamber 107, a pair of mounting cylinders 5 are bolted side-by-side to the rear side wall of the housing 1; the inner cavities of both mounting cylinders 5 are connected to the heating chamber 107; a conventional first fan 501 is bolted to each of the two mounting cylinders 5; the air outlets of both first fans 501 are horizontally directed towards the heating assembly 4. When the first fan 501 is working, it blows air into the heating chamber 107 through the mounting cylinders 5. The air is heated by the electric heating rod 402 in the heating chamber 107 and then transported to the hot air chamber 104 through the inner cavity of the connecting cylinder 108. This not only promotes the flow of hot air but also ensures the heating efficiency in the hot air chamber 104.

[0032] Furthermore, such as Figures 3-6As shown, in order to increase the flow rate of hot air, second fans 6 are horizontally bolted into multiple connecting cylinders 108; the air inlet of any second fan 6 points towards the heating chamber 107; when the second fan 6 is working, the heat in the heating chamber 107 is quickly drawn into the hot air chamber 104 through the inner cavity of the connecting cylinder 108, thereby further increasing the flow rate of hot air and also accelerating the exhaust efficiency of the air outlet 106; guide plates 7 corresponding to the connecting cylinder 108 are inclinedly arranged in both hot air chambers 104; one edge of each guide plate 7 is bolted to the rear side wall of the housing 1; the other edge of each guide plate 7 is bolted to the top and bottom walls of the housing 1, respectively. By installing a guide plate 7 at an incline inside the hot air chamber 104, corresponding to the connecting cylinder 108, the hot air discharged from the connecting cylinder 108 is blown onto the guide plate 7 and reflected by the guide plate 7 so that the hot air is horizontally input into the hot air chamber 104. This ensures the stability of the hot air flow in the hot air chamber 104 and avoids problems such as insufficient hot air near the front wall of the housing 1.

[0033] In addition, such as Figure 5 As shown, in order to ensure the uniformity of the hot air discharged into the preheating chamber 105, air distribution plates 8 are horizontally bolted to the outlet ends of multiple air outlets 106; multiple air distribution plates 8 have multiple through holes 801 arranged vertically side by side on their upper surfaces. The hot air in the hot air chamber 104 enters the preheating chamber 105 vertically through the through holes 801, which can effectively improve the heating uniformity of the film.

[0034] Example 3: Based on Example 2, as follows Figure 3 and Figure 7 As shown, to avoid heat concentration in the preheating chamber 105 and to improve the flow of hot air in the preheating chamber 105, return air chambers 203 connected to the heating chamber 107 are provided in each of the multiple first conveying rollers 201 and the multiple second conveying rollers 202. Furthermore, multiple negative pressure holes 204 connected to the return air chambers 203 are arranged side-by-side on the circumferential sidewalls of the multiple first conveying rollers 201 and the multiple second conveying rollers 202. After the hot air in the hot air chamber 104 is vertically blown into the preheating chamber 105 through the air outlet 106, the hot air in the preheating chamber 105 flows back to the heating chamber 107 through the negative pressure holes 204 and the return air chambers 203, thereby effectively improving the circulation of hot air and ensuring the thermal stability of the film.

[0035] Specifically, such as Figures 3-7As shown, a pair of third partitions 109 are horizontally welded from top to bottom between the two first partitions 102; negative pressure chambers 110 are formed between the two third partitions 109, the rear side wall of the housing 1, the second partition 103, and the two first partitions 102; the negative pressure chambers 110, hot air chambers 104, and heating chambers 107 are all independent of each other; one end of each of the multiple first conveying rollers 201 and one end of each of the multiple second conveying rollers 202 are rotatably connected to conventional movable joints 205 in the art, and each end of each of the multiple first conveying rollers 201 and one end of each of the multiple second conveying rollers 202 is axially provided with a channel for connecting the return air chamber 203 and the inner cavity of the movable joint 205, through which hot air in the return air chamber 203 is input into the movable joint 205; each of the multiple movable joints 205 is connected to a conveyor... Air duct 206; one end of the air duct 206 on multiple first conveying rollers 201 is connected to a third partition 109, and the return air chamber 203 of multiple first conveying rollers 201 is connected to a negative pressure chamber 110 through the air duct 206; one end of the air duct 206 on multiple second conveying rollers 202 is connected to another third partition 109, and the return air chamber 203 of multiple second conveying rollers 202 is connected to another negative pressure chamber 110 through the air duct 206; multiple third fans 9 corresponding to the negative pressure chamber 110 are arranged side by side on the opposite sides of the two first partitions 102, and the multiple third fans 9 are bolted to the two first partitions 102 respectively; the third fans 9 are used to draw the hot air in the negative pressure chamber 110 to the hot air chamber 104 adjacent to the negative pressure chamber 110. When the third fan 9 is working, the negative pressure chamber 110 is drawn to a negative pressure state, causing the hot air in the heating chamber 107 to flow back to the negative pressure chamber 110 through the negative pressure hole 204, the return air chamber 203, the movable joint 205 and the air supply pipe 206. Then, the negative pressure chamber 110 is drawn back to the hot air chamber 104 by the third fan 9, thus isolating the return air chamber 203 from the heating chamber 107. This not only avoids the problem of difficulty in hot air recirculation in the return air chamber 203 caused by the first fan 501 blowing air into the heating chamber 107, but also further accelerates the flow of hot air in the heating chamber 107.

[0036] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A preheating oven mechanism, comprising a housing (1) and a conveying assembly (2) installed within the housing (1); wherein the opposite side walls of the housing (1) are provided with inlets and outlets (101); characterized in that: Inside the box (1), a pair of first partitions (102) are fixed horizontally side by side from top to bottom; the two first partitions (102) are connected by a second partition (103) parallel to the front side wall of the box (1); the two first partitions (102) form hot air chambers (104) between the top wall and the bottom wall of the box (1) respectively. A preheating chamber (105) is formed between the two first partitions (102), the front side wall of the box (1), and the second partition (103) and is connected to the inlet and outlet (101); multiple air outlets (106) for connecting the hot air chamber (104) and the preheating chamber (105) are arranged side by side on the opposite sides of the two first partitions (102). The conveying assembly (2) includes a plurality of first conveying rollers (201) arranged side by side and a plurality of second conveying rollers (202) that are parallel to the first conveying rollers (201); the two ends of the plurality of first conveying rollers (201) and the two ends of the plurality of second conveying rollers (202) are respectively rotatably connected to the front side wall of the housing (1) and the second partition (103), and the plurality of second conveying rollers (202) are all arranged above the first conveying rollers (201); In this configuration, a first conveying roller (201) is provided on both sides of any air outlet (106) on a first partition (102) near the first conveying roller (201); and a second conveying roller (202) is provided on both sides of any air outlet (106) on another first partition (102) near the second conveying roller (202).

2. The preheating oven mechanism as described in claim 1, characterized in that, Guide components (3) are installed on the opposite outer sides of the two inlets and outlets (101); the guide components (3) include a pair of bearing blocks (301) respectively fixed on the opposite sides of the inlets and outlets (101); a pair of guide rollers (302) are rotatably connected side by side from top to bottom between the two bearing blocks (301); a film conveying gap is formed between the two guide rollers (302).

3. The preheating oven mechanism as described in claim 1, characterized in that, A heating chamber (107) is formed between the two first partitions (102), the rear side wall of the box body (1), and the second partition (103); a heating assembly (4) is installed in the heating chamber (107); multiple vertically arranged connecting cylinders (108) are fixedly inserted side by side on the opposite sides of the two first partitions (102); the connecting cylinders (108) can transport the hot air in the heating chamber (107) to the hot air chamber (104) through their inner cavity.

4. A preheating oven mechanism as described in claim 3, characterized in that, The heating component (4) includes a pair of support seats (401) fixed side by side on the rear side wall of the box (1); a plurality of electric heating rods (402) are fixed horizontally side by side between the two support seats (401) from top to bottom.

5. A preheating oven mechanism as described in claim 3 or 4, characterized in that, A pair of mounting cylinders (5) are fixed side by side on the rear side wall of the housing (1); the inner cavity of the two mounting cylinders (5) is connected to the heating chamber (107); a first fan (501) is fixed in the two mounting cylinders (5); the air outlet of the two first fans (501) is horizontally pointing towards the heating component (4).

6. A preheating oven mechanism as described in claim 3, characterized in that, Each of the multiple connecting cylinders (108) has a second fan (6) fixed horizontally inside; the air inlet of any one of the second fans (6) points to the heating chamber (107).

7. A preheating oven mechanism as described in claim 6, characterized in that, Both hot air chambers (104) are provided with guide plates (7) that correspond to the connecting cylinder (108) at an incline; one edge of each guide plate (7) is fixed to the rear side wall of the box body (1); the other edge of each guide plate (7) is fixed to the top and bottom walls of the box body (1) respectively.

8. A preheating oven mechanism as described in claim 3, characterized in that, Each of the first conveying rollers (201) and the second conveying rollers (202) is provided with a return air chamber (203) that communicates with the heating chamber (107). The circumferential sidewalls of the first conveying rollers (201) and the circumferential sidewalls of the second conveying rollers (202) are provided with a plurality of negative pressure holes (204) that communicate with the return air chambers (203).

9. A preheating oven mechanism as described in claim 8, characterized in that, A pair of third partitions (109) are horizontally fixed between the two first partitions (102) from top to bottom; negative pressure chambers (110) are formed between the two third partitions (109), the rear side wall of the box (1), the second partition (103), and the two first partitions (102); a movable joint (205) is rotatably connected to one end of the plurality of first conveying rollers (201) and one end of the plurality of second conveying rollers (202); an air supply pipe (206) is connected to the plurality of movable joints (205); the plurality of first conveying rollers (201) are rotatably connected to one end of the plurality of second conveying rollers (202); an air supply pipe (206) is connected to the plurality of movable joints (205); the plurality of first conveying rollers (201) are rotatably connected to one end of the first conveying rollers (202). One end of the air duct (206) on the conveying roller (201) is connected to a third partition (109), and the return air chambers (203) of the plurality of first conveying rollers (201) are connected to a negative pressure chamber (110) through the air duct (206); one end of the air duct (206) on the plurality of second conveying rollers (202) is connected to another third partition (109), and the return air chambers (203) of the plurality of second conveying rollers (202) are connected to another negative pressure chamber (110) through the air duct (206).

10. A preheating oven mechanism as described in claim 1, characterized in that, Each of the multiple air outlets (106) has a horizontally fixed air distribution plate (8) at its outlet end; the upper surface of each of the multiple air distribution plates (8) has multiple through holes (801) arranged in parallel vertically.

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