Tunnel drying furnace with uniform heating

Abstract

The present application relates to a tunnel drying furnace with uniform heating. The tunnel drying furnace with uniform heating described in the present application comprises: a furnace body, an air inlet pipe, an air outlet pipe, a heating mechanism, a partition plate, a heat dispersion component, and a roller; a furnace chamber is formed in the furnace body, and the partition plate is horizontally placed and installed in the furnace chamber; the heating mechanism is installed in the heating cavity in the furnace chamber; the heat dispersion component and the roller are respectively installed in the distribution cavity; the roller is installed above the heat dispersion component, and one roller is respectively provided on both sides above a heat dispersion component; the length direction of the roller is consistent with the length direction of the slit, and the length direction of the roller is perpendicular to the film material conveying direction. The tunnel drying furnace with uniform heating described in the present application has the advantage of uniform heating of the film material.

Description

Technical Field

[0001] The present application relates to the technical field of drying ovens, and in particular to a tunnel drying oven with uniform heating. Background Art

[0002] The tunnel furnace is a continuous heating equipment used in industrial production. Its design allows materials to be heat treated through a narrow heating channel (i.e., "tunnel"). The tunnel furnace (special functional tape processing type) is a tunnel-type mechanical equipment that completes the tape baking through heat conduction, convection, and radiation. The tunnel furnace body is generally very long, about 60 to 80 meters. The furnace cavity is a narrow tunnel, generally 80cm to 140cm wide. There is a continuously operating conveying system in the tunnel, which can be continuously produced, with high efficiency and labor saving. This type of tunnel furnace is widely used in the baking of special functional tapes in the precision manufacturing process of electronic components, semiconductors and electronic devices, as well as other industries that require high-temperature treatment of materials.

[0003] The main features of tunnel furnace:

[0004] 1) Continuous production: Materials move continuously in the furnace through the conveying system, which can achieve an uninterrupted production process.

[0005] 2) High efficiency: Due to its continuous working characteristics, the tunnel furnace can improve production efficiency and reduce labor costs.

[0006] 3) Temperature control: A precise temperature control system can be used to ensure temperature consistency throughout the heating process.

[0007] 4) Multi-purpose: According to different application requirements, the tunnel furnace can be equipped with a variety of heating methods, such as electric heating, gas heating or infrared heating.

[0008] How it works:

[0009] 1) Feed end: The material enters the furnace from one end.

[0010] 2) Heating zone: The material passes through a series of heating zones in the furnace and is evenly heated to the required temperature in these zones.

[0011] 3) Discharging end: After the heating treatment is completed, the material is discharged from the other end.

[0012] The tunnel furnace of the prior art uses a circular hole at the bottom for heat transfer. After heating each area of ​​the tunnel furnace, the heat transferred to the furnace cavity is not evenly dispersed, and the heat is transported to the tunnel furnace cavity above the partition plate, resulting in local high temperature, causing premature foaming of the product, affecting product performance and appearance, etc. Summary of the invention

[0013] Based on this, the purpose of the present application is to provide a tunnel drying furnace with uniform heating, which has the advantages of uniform furnace temperature distribution, so that the film material is heated evenly, avoiding foaming and thus ensuring product quality.

[0014] In one aspect of the present application, there is provided a tunnel drying furnace with uniform heating, comprising a furnace body, an air inlet pipe, an air outlet pipe, a heating mechanism, a partition plate, a heat dissipation component, and a rotating roller;

[0015] A furnace is formed in the furnace body, the partition plate is horizontally placed and installed in the furnace, and the partition plate divides the furnace into a heating chamber and a distribution chamber;

[0016] The heating mechanism is installed in the heating chamber in the furnace;

[0017] One end of the air inlet pipe is installed on the furnace body and communicated with the heating chamber;

[0018] The heat dissipation assembly and the rotating roller are respectively installed in the distribution cavity;

[0019] The partition plate is provided with a slit in the transverse direction, and the heat dispersion component is mounted on the partition plate and placed above the slit; the heat dispersion component is used to diffuse and distribute the rising airflow at the slit;

[0020] The rotating roller is installed above the heat dissipation component, and one rotating roller is respectively arranged on both sides above a heat dissipation component;

[0021] The length direction of the rotating roller is consistent with the length direction of the slit, and the length direction of the rotating roller is perpendicular to the conveying direction of the film material.

[0022] The uniformly heated tunnel drying furnace described in the present application realizes uniform heat distribution in the furnace through multiple technical means. First, slits are provided to change the existing circular hole ventilation mode, so that the hot air is concentrated and distributed along a straight line, thereby facilitating diffusion; second, by providing a heat dispersion component, the hot air formed in the heating chamber is diffused and fully diffused to the surroundings; third, the rollers correspond to the heat dispersion components, and one heat dispersion component corresponds to one or two rollers, thereby ensuring that the temperature is conveniently controlled when the heat is transferred to the rollers, thereby effectively preventing the film material from overheating at the rollers. Through the above-mentioned methods, the heat distribution in the furnace is more uniform, thereby ensuring the stable quality of the film material in the furnace, and ensuring that the film material does not foam, thereby improving the production quality of the film material and the stability of the product.

[0023] Further, the heat dissipation assembly includes an arc-shaped steel sheet, a fixing column, a first back cover, and a second back cover;

[0024] The cross-sectional shape of the arc-shaped steel sheet is low in the middle and high at both sides, and the two ends are bent downward to form a flow channel for airflow to diffuse to both sides and then flow downward;

[0025] The fixing column is installed on the arc-shaped steel sheet and is placed on the upper surface of the arc-shaped steel sheet; the fixing column is arranged along the length direction of the arc-shaped steel sheet, and the arc-shaped steel sheet is fixed on the furnace body through the fixing column;

[0026] The first back cover is mounted on a high upper surface of the arc-shaped steel sheet;

[0027] The second back cover is installed on another high upper surface of the arc-shaped steel sheet.

[0028] Furthermore, the cross section of the arc-shaped steel sheet is a spliced ​​shape of three "C" shapes, which are respectively a large C shape with an opening facing upward, and a first small C shape and a second small C shape with an opening facing downward;

[0029] The first back cover is fixed to the upper surface of the first small C-shape of the arc-shaped steel sheet;

[0030] The second back cover is fixed on the upper surface of the second small C-shape of the arc-shaped steel sheet.

[0031] Further, the cross-sections of the first back cover and the second back cover are respectively "C"-shaped;

[0032] The cross-sectional area of ​​the first back cover is smaller than the cross-sectional area of ​​the first small C-shape of the arc-shaped steel sheet;

[0033] The cross-sectional area of ​​the second back cover is smaller than the cross-sectional area of ​​the second small C-shape of the arc-shaped steel sheet;

[0034] The first back cover is buckled on the arc-shaped steel sheet to form a first space;

[0035] The second back cover is buckled on the arc-shaped steel sheet to form a second space.

[0036] Further, the heat dispersion assembly also includes a diffusion plate;

[0037] The diffusion plate is installed above the arc-shaped steel sheet, and the diffusion plate is installed above the first small C-shape and above the second small C-shape respectively;

[0038] The diffusion plate is placed horizontally, and the length direction of the diffusion plate is consistent with the length direction of the slit.

[0039] Furthermore, at room temperature, the upper portion of one end of the arc-shaped steel sheet corresponds to the midpoint of the width direction of the diffuser plate; the upper portion of the other end of the arc-shaped steel sheet corresponds to the midpoint of the width direction of the other diffuser plate.

[0040] Furthermore, the heat dissipation assembly further comprises a diffusion sheet; the cross section of the diffusion sheet is in the shape of an arc, and the arc is convex downward, and the diffusion sheet is buckled on the diffusion plate;

[0041] The two diffusion plates above the same arc-shaped steel sheet are respectively provided with the diffusion sheets, one of which is located at one end of the one diffusion plate, and the other diffusion sheet is located at the other end of the other diffusion plate;

[0042] The diffusion sheet corresponds to the outer side of the arc-shaped steel sheet.

[0043] Furthermore, a limiting plate is formed on the partition plate, and two limiting plates are respectively installed on both sides of the slit;

[0044] The length direction of the limiting plate is consistent with the length direction of the slit;

[0045] A limiting channel is formed between the two paired limiting plates;

[0046] The limiting channel is located directly below the middle of the arc-shaped steel sheet.

[0047] Furthermore, the air outlet duct includes a first air duct, a second air duct, and a main duct;

[0048] The first air duct is installed above the air inlet end of the furnace body;

[0049] The second air duct is installed above the other end of the air inlet end of the furnace body;

[0050] The inner diameter of the second air duct is greater than the inner diameter of the first air duct;

[0051] The first air duct and the second air duct are respectively connected to the main pipe, and the airflows discharged from the first air duct and the second air duct are collected and then drawn out from the main pipe;

[0052] The end of the main pipe is connected to the exhaust system;

[0053] The end of the air inlet pipe is connected to the air blower.

[0054] Furthermore, baffles with a plurality of micro-circular holes are respectively installed at the inlets of the first air duct and the second air duct.

[0055] For better understanding and implementation, the present application is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 This is a schematic diagram of the structure of a tunnel drying furnace with uniform heating according to the present application;

[0057] Figure 2 This is a schematic structural diagram of another exemplary uniformly heated tunnel drying furnace of the present application;

[0058] Figure 3 A schematic diagram of a three-dimensional structure of an exemplary heat dissipation component of the present application;

[0059] Figure 4 A schematic diagram of a three-dimensional structure of an exemplary heat dissipation component of the present application from another perspective;

[0060] Figure 5 A side view of an exemplary heat dissipation assembly of the present application;

[0061] Figure 6 A side view of another exemplary heat dissipation assembly of the present application;

[0062] Figure 7 is a schematic diagram of a three-dimensional structure of another exemplary heat dissipation component of the present application;

[0063] Figure 8 A bottom view of an exemplary first air duct of the present application;

[0064] Fig. 9 This is a schematic diagram of the three-dimensional structure of an exemplary first air duct of the present application;

[0065] Fig.10 This is a shape comparison diagram of an exemplary curved steel sheet of the present application under two different temperature conditions. DETAILED DESCRIPTION

[0066] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating positions or positional relationships, are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application 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 cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0067] like Figure 1-Figure 10 As shown, an exemplary uniformly heated tunnel drying furnace of the present application includes a furnace body 10, an air inlet pipe 20, an air outlet pipe 80, a heating mechanism 21, a partition plate 30, a heat dissipation component 50, and a rotating roller 60;

[0068] A furnace is formed in the furnace body 10, and the partition plate 30 is horizontally placed and installed in the furnace, and the partition plate 30 divides the furnace into a heating chamber A1 and a distribution chamber A2;

[0069] The heating mechanism 21 is installed in the heating chamber A1 in the furnace;

[0070] One end of the air inlet pipe 20 is mounted on the furnace body 10 and communicates with the heating chamber A1;

[0071] The heat dissipation assembly 50 and the rotating roller 60 are respectively installed in the distribution chamber A2;

[0072] The partition plate 30 is provided with a slit 40 in a transverse direction, and the heat dissipation assembly 50 is mounted on the partition plate 30 and placed above the slit 40; the heat dissipation assembly 50 is used to diffuse and distribute the rising airflow at the slit 40;

[0073] The rotating roller 60 is installed above the heat dissipation component 50, and one rotating roller 60 is respectively arranged on both sides above a heat dissipation component 50;

[0074] The length direction of the rotating roller 60 is consistent with the length direction of the slit 40 , and the length direction of the rotating roller 60 is perpendicular to the conveying direction of the film material 70 .

[0075] In the present application, the length direction of the furnace body 10 is the same as the conveying direction of the film material 70, and the length direction of the slit 40, the length direction of the roller 60, the length direction of the heat dispersion component 50, and the width direction of the furnace body 10 are all consistent; in other words, the length direction of the slit 40, the length direction of the roller 60, and the length direction of the heat dispersion component 50 are perpendicular to the length direction of the furnace body 10; or, the length direction of the slit 40, the length direction of the roller 60, and the length direction of the heat dispersion component 50 are perpendicular to the conveying direction of the film material 70.

[0076] The uniformly heated tunnel drying furnace described in the present application realizes uniform heat distribution in the furnace through multiple technical means. First, a slit 40 is provided to change the existing circular hole ventilation mode, so that the hot air is concentrated and distributed along a straight line, thereby facilitating diffusion; second, by providing a heat dispersion component 50, the hot air formed in the heating chamber A1 is diffused and fully diffused to the surroundings; third, the roller 60 corresponds to the heat dispersion component 50, and one heat dispersion component 50 corresponds to one or two rollers 60, thereby ensuring that the temperature is conveniently controlled when the heat is transferred to the roller 60, thereby effectively preventing the film material 70 from overheating at the roller 60. Through the above-mentioned methods, the heat distribution in the furnace is more uniform, thereby ensuring the quality stability of the film material 70 in the furnace, and ensuring that the film material 70 does not foam, thereby improving the production quality of the film material 70 and the stability of the product.

[0077] In some preferred embodiments, the width of the slit 40 is 3 mm to 100 mm. In one preferred embodiment, the width of the slit 40 is 35 mm.

[0078] In some preferred embodiments, the total cross-sectional area of ​​the slits 40 is the same as the total cross-sectional area of ​​the original circular holes. Alternatively, the total cross-sectional area of ​​the slits 40 is greater than the total cross-sectional area of ​​the original circular holes. The original circular holes referred to here refer to the circular holes of the tunnel furnace in the prior art, and the total cross-sectional area refers to the sum of the cross-sectional areas of all the circular holes. This embodiment points out that, compared with the circular holes in the prior art, although the structural form of the present application has changed, the total cross-sectional area has not decreased, and has even increased, so that the total ventilation volume has not decreased, and has even increased.

[0079] In some preferred embodiments, the heat dissipation assembly 50 includes an arc-shaped steel sheet 51, a fixing column 54, a first back cover 52, and a second back cover 53;

[0080] The cross-sectional shape of the arc-shaped steel sheet 51 is low in the middle and high at both sides, and both ends are bent downward to form a flow channel for airflow to diffuse to both sides and then flow downward;

[0081] The fixing column 54 is installed on the arc-shaped steel sheet 51 and is placed on the upper surface of the arc-shaped steel sheet 51; the fixing column 54 is arranged along the length direction of the arc-shaped steel sheet 51, and the arc-shaped steel sheet 51 is fixed to the furnace body 10 through the fixing column 54;

[0082] The first back cover 52 is installed on a high upper surface of the arc-shaped steel sheet 51;

[0083] The second back cover 53 is installed on another upper surface of the arc-shaped steel sheet 51 at a higher position.

[0084] The arc-shaped steel sheet 51 is low in the middle and high on both sides, and the ends are bent downward, so that when the airflow rises from the slit 40 to the arc-shaped steel sheet 51, it first hits the low position in the middle of the arc-shaped steel sheet 51, and then in the process of diffusing to both sides, it first rises, and then goes down at the ends of the arc-shaped steel sheet 51, at which time the airflow is diffused and redistributed. When the airflow encounters the arc-shaped steel sheet 51, it first diffuses into two parts, then rises, and then flows horizontally or downward; after leaving the obstruction of the arc-shaped steel sheet 51, the airflow continues to rise. Therefore, in the whole process, the airflow is diffused multiple times and evenly distributed.

[0085] Compared with the circular hole method, the present application is more suitable for the roller 60 solution.

[0086] In some preferred embodiments, the length of the fixing column 54 is greater than that of the arc-shaped steel sheet 51 , and both ends of the fixing column 54 protrude from the arc-shaped steel sheet 51 , thereby facilitating welding and fixing both ends of the fixing column 54 to the furnace body 10 .

[0087] The fixing column 54 is installed on the arc-shaped steel sheet 51 , which on one hand strengthens the structural strength of the arc-shaped steel sheet 51 , and on the other hand can fix the arc-shaped steel sheet 51 to the furnace body 10 through the fixing column 54 .

[0088] The two key structures in the present application are the first back cover 52 and the second back cover 53. The first back cover 52 and the second back cover 53 are respectively located on the leeward side of the arc-shaped steel sheet 51. The hot air will not directly impact on the first back cover 52 and the second back cover 53, but will impact on the lower surface of the arc-shaped steel sheet 51. The upper surface of the arc-shaped steel sheet 51 and the area above it will not be directly impacted by the hot air. Therefore, there will be a temperature difference between the upper and lower surfaces of the arc-shaped steel sheet 51, especially the temperature of the first back cover 52 and the second back cover 53 above the arc-shaped steel sheet 51 will be different from the temperature below the arc-shaped steel sheet 51. This makes the temperature of the arc-shaped steel sheet 51 different from the temperature of the first back cover 52 and the second back cover 53, so they will be affected differently by heat.

[0089] like Fig.10 As shown, Fig.10 The deformation effect comparison diagram of the curved steel sheet at two different temperatures is demonstrated. Fig.10 In the figure, the upper figure shows the shape of the curved steel sheet when the temperature is relatively low, and the lower figure shows the shape of the curved steel sheet when the temperature is relatively high; since the shape change caused by the temperature change of the curved steel sheet is affected by the first back cover and the second back cover, the curved steel sheet is connected to the first back cover and the second back cover for illustration during the demonstration. In some preferred embodiments, the curved steel sheet 51, the first back cover 52, and the second back cover 53 are made of the same material. In this embodiment, the curved steel sheet 51, the first back cover 52, and the second back cover 53 have the same thermal expansion coefficient. Since the temperature of the curved steel sheet 51 is higher than that of the first back cover 52 and the second back cover 53, the thermal expansion of the curved steel sheet 51 is greater than the thermal expansion of the first back cover 52, and also greater than the thermal expansion of the second back cover 53. When the temperature in the furnace rises, the heat dispersion assembly 50 will also expand due to the heat. Since the thermal expansion of the first back cover 52 and the second back cover 53 is small, and due to the restraint of the first back cover 52 and the second back cover 53, the two ends of the arc-shaped steel sheet 51 extend laterally after the thermal expansion. Then, after the hot air passes through the arc-shaped steel sheet 51, the flow direction is more inclined to horizontal flow, so that it eventually flows farther.

[0090] Continue to combine Fig.10As shown, when the temperature is low, the curved steel sheet 51 is in a "contracted" state, the airflow eventually flows downward, and the diffusion range is slightly smaller; when the temperature is high, the curved steel sheet 51 is in an "expanded" state, the airflow eventually flows horizontally, and the diffusion range is slightly larger. Then, the higher the temperature, the flatter the curved steel sheet 51 is after thermal expansion, the larger the lateral flow range of the airflow after diffusion, and the more uniform the diffusion. In this way, the uniformity of diffusion is changed by changing the diffusion range at different temperatures, thereby offsetting the impact of the temperature increase, thereby ensuring that the film material 70 is prevented from foaming.

[0091] In other preferred embodiments, the first back cover 52 and the second back cover 53 are made of the same material, the arc-shaped steel sheet 51 is made of a different material from them, and the thermal expansion coefficient of the first back cover 52 is smaller than the thermal expansion coefficient of the arc-shaped steel sheet 51. In this embodiment, the difference from the previous embodiment is that the materials are different and the expansion coefficients are different, and thus, when the temperature rises, the arc-shaped steel sheet 51 is more likely to deform and the deformation amount is larger than that in the previous embodiment.

[0092] In some preferred embodiments, the cross section of the arc-shaped steel sheet 51 is a spliced ​​shape of three "C" shapes, which are respectively a large C-shape 511 with an opening facing upward, and a first small C-shape 512 and a second small C-shape 513 with an opening facing downward;

[0093] The first back cover 52 is fixed to the upper surface of the first small C-shaped 512 of the arc-shaped steel sheet 51;

[0094] The second back cover 53 is fixed on the upper surface of the second small C-shape 513 of the arc-shaped steel sheet 51 .

[0095] In the structure shown in the accompanying drawings, the arc-shaped steel sheet 51 is in the shape of three "C"-shaped splicing, so as to more conveniently achieve the technical effect to be achieved in the present application.

[0096] In other embodiments, the cross section of the arc steel sheet 51 is a spliced ​​shape of three "V" shapes. The V-shaped structure has greater airflow resistance than the C-shaped structure, and the airflow is not as smooth as the C-shaped structure. However, the V-shaped structure can also achieve the desired purpose of this application.

[0097] In some preferred embodiments, the cross-sections of the first back cover 52 and the second back cover 53 are respectively "C"-shaped;

[0098] The cross-sectional area of ​​the first back cover 52 is smaller than the cross-sectional area of ​​the first small C-shape 512 of the arc-shaped steel sheet 51;

[0099] The cross-sectional area of ​​the second back cover 53 is smaller than the cross-sectional area of ​​the second small C-shape 513 of the arc-shaped steel sheet 51;

[0100] The first back cover 52 is buckled on the arc-shaped steel sheet 51 to form a first space;

[0101] The second back cover 53 is buckled on the arc-shaped steel sheet 51 to form a second space.

[0102] The first space and the second space are filled with air respectively, and are affected by the first space, and the first back cover 52 is located on the leeward side of the arc-shaped steel sheet 51, so the temperature of the first back cover 52 is lower than that of the arc-shaped steel sheet 51, so that the first back cover 52 and the second back cover 53 can better promote the increase of the deformation amount of the arc-shaped steel sheet 51 due to thermal expansion. In other words, the formation of the first space and the second space can better promote the increase of the deformation amount of the arc-shaped steel sheet 51 during thermal expansion.

[0103] In some preferred embodiments, the heat dispersion assembly 50 further includes a diffusion plate 55;

[0104] The diffusion plate 55 is installed above the arc-shaped steel sheet 51, and the diffusion plate 55 is installed above the first small C-shaped sheet 512 and above the second small C-shaped sheet 513 respectively;

[0105] The diffusion plate 55 is placed horizontally, and the length direction of the diffusion plate 55 is consistent with the length direction of the slit 40 .

[0106] The setting of the diffusion plate 55, combined with the arc-shaped steel sheet 51, enables the airflow to form a double "T"-shaped hot air flow distribution. A "T"-shaped hot air flow distribution is formed at the arc-shaped steel sheet 51, and another "T"-shaped hot air flow distribution is formed at the diffusion plate 55. As a result, the hot air flow is fully diffused and evenly distributed, and then the hot air flow at the roller 60 has been fully diffused and evenly distributed, and the heat on the roller 60 is appropriate, so that the film material 70 will not foam.

[0107] In some preferred embodiments, at room temperature, the upper portion of one end of the arc-shaped steel sheet 51 corresponds to the midpoint of the width direction of the diffuser plate 55 ; the upper portion of the other end of the arc-shaped steel sheet 51 corresponds to the midpoint of the width direction of the other diffuser plate 55 .

[0108] The diffusion plate 55 is arranged at this position, which is beneficial to the diffusion of the hot air flow, and its position is shown in the accompanying drawings.

[0109] In some preferred embodiments, the heat dissipation assembly 50 further includes a diffusion sheet 56; the cross section of the diffusion sheet 56 is arc-shaped, and the arc is convex downward, and the diffusion sheet 56 is buckled on the diffusion plate 55;

[0110] The two diffusion plates 55 above the same arc-shaped steel sheet 51 are respectively installed with the diffusion plates 56, one of the diffusion plates 56 is located at one end of the one diffusion plate 55, and the other diffusion plate 56 is located at the other end of the other diffusion plate 55;

[0111] The diffusion sheet 56 corresponds to the outer side of the arc-shaped steel sheet 51 .

[0112] The setting of the diffuser 56 helps the airflow to flow in opposite directions. In the embodiment described in the accompanying drawings, as shown in the perspective of the figure, the two diffusers 55 above the arc-shaped steel sheet 51, the diffuser 56 on the left diffuser 55 is set at the left position, and the diffuser 56 on the right diffuser 55 is set at the right position. Therefore, the diffuser 56 on the left diffuser 55 guides part of the airflow to flow to the right; the diffuser 56 on the right diffuser 55 guides part of the airflow to flow to the left. Furthermore, the airflow on the left diffuser 55 flows in two directions, and the diffuser 56 promotes the airflow to flow to the right; the airflow on the right diffuser 55 flows in two directions, and the diffuser 56 promotes the airflow to flow to the left. Finally, the airflow distribution is more uniform, the heating on the roller 60 is more suitable, the phenomenon of local high temperature is avoided, and the foaming of the film material 70 is also avoided.

[0113] In some preferred embodiments, a limiting plate 41 is formed on the partition plate 30, and two limiting plates 41 are respectively installed on both sides of the slit 40;

[0114] The length direction of the limiting plate 41 is consistent with the length direction of the slit 40;

[0115] A limiting channel is formed between the two paired limiting plates 41;

[0116] The limiting channel is located directly below the middle of the arc-shaped steel sheet 51 .

[0117] The limiting plate 41 serves to limit the airflow direction above the slit 40 , and also improves the structural stability and strength of the slit 40 .

[0118] In some preferred embodiments, the air outlet duct 80 includes a first air duct 81, a second air duct 82, and a main duct 83;

[0119] The first air duct 81 is installed above the air inlet end of the furnace body 10;

[0120] The second air duct 82 is installed above the other end of the air inlet end of the furnace body 10;

[0121] The inner diameter of the second air duct 82 is greater than the inner diameter of the first air duct 81;

[0122] The first air duct 81 and the second air duct 82 are respectively connected to the main duct 83, and the airflows discharged from the first air duct 81 and the second air duct 82 are combined and then drawn out from the main duct 83;

[0123] The end of the main pipe 83 is connected to the exhaust system;

[0124] The end of the air inlet pipe 20 is connected to the air blower.

[0125] Another means of achieving the purpose of the present application is to respectively set air ducts at both ends of the furnace body 10 so that an efficient heat cycle is formed in the furnace body 10, thereby promoting uniform and reasonable distribution of heat.

[0126] In addition, the second air duct 82 in the present application is located at the end of the film material 70 conveying direction of the furnace body 10, and the first air duct 81 is located at the front end of the film material 70 conveying direction of the furnace body 10, and the inner diameter of the second air duct 82 is larger than the inner diameter of the first air duct 81, so that more air is drawn out from the second air duct 82, which promotes the circulation and flow of airflow in the furnace.

[0127] In some preferred embodiments, the cross-sectional area of ​​the first air duct 81 and the second air duct 82 is equal to the cross-sectional area of ​​the air inlet duct 20 .

[0128] In some other preferred embodiments, the cross-sectional area of ​​the first air duct 81 and the second air duct 82 is larger than the cross-sectional area of ​​the air inlet duct 20 .

[0129] In some preferred embodiments, a baffle 811 having a plurality of micro-circular holes 812 is installed at the inlet of the first air duct 81 and the second air duct 82. Figure 8 and Fig. 9 As shown, it illustrates a structure of a first air duct, and similarly, the second air duct also has the same structure.

[0130] Baffles 811 are installed at the inlets of the first air duct 81 and the second air duct 82 respectively. A plurality of micro-circular holes 812 are opened on the baffles 811 to enhance uniform air extraction.

[0131] In some preferred embodiments, the heating mechanism 21 is an electric heating wire or an electric heating roller; a plurality of electric heating wires or electric heating rollers arranged in parallel are provided in the heating chamber A1.

[0132] The working principle of the uniformly heated tunnel drying furnace of this application is briefly described as follows:

[0133] 1) Produce hot air. The air inlet pipe 20 is connected to the blower, and air enters from the air inlet pipe 20 and is then heated at the heating mechanism 21 in the furnace to become hot air.

[0134] 2) Uniform diffusion: The hot air rises through the slit 40 and, under the influence of the heat dissipation assembly 50, is evenly distributed in the furnace and appropriately heats the roller 60.

[0135] 3) Heating the film material 70 . The film material 70 is heated by hot air, and the rotating roller 60 is heated by the hot air, and the temperature of the film material 70 is affected.

[0136] 4) Extraction: The hot air in the furnace is extracted through the air outlet pipe 80.

[0137] In some preferred solutions, the extracted hot air re-enters the air inlet duct 20 for the next heat cycle to reduce the energy consumption required for heating.

[0138] The uniformly heated tunnel drying furnace of the present application can fully and evenly diffuse the heat and hot air flow in the furnace, and make the temperature at the roller 60 suitable, thereby avoiding overheating and foaming of the film material 70 and improving product quality.

[0139] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A tunnel drying furnace with uniform heating, characterized in that: It includes a furnace body, an air inlet pipe, an air outlet pipe, a heating mechanism, a partition plate, a heat dissipation component, and a rotating roller; A furnace is formed in the furnace body, the partition plate is horizontally placed and installed in the furnace, and the partition plate divides the furnace into a heating chamber and a distribution chamber; The heating mechanism is installed in the heating chamber in the furnace; One end of the air inlet pipe is installed on the furnace body and communicated with the heating chamber; The heat dissipation assembly and the rotating roller are respectively installed in the distribution cavity; The partition plate is provided with a slit in the transverse direction, and the heat dispersion component is mounted on the partition plate and placed above the slit; the heat dispersion component is used to diffuse and distribute the rising airflow at the slit; The rotating roller is installed above the heat dissipation component, and one rotating roller is respectively arranged on both sides above a heat dissipation component; The length direction of the roller is consistent with the length direction of the slit, and the length direction of the roller is perpendicular to the film material conveying direction; The heat dissipation assembly includes an arc-shaped steel sheet, a fixing column, a first back cover, and a second back cover; The cross-sectional shape of the arc-shaped steel sheet is low in the middle and high at both sides, and the two ends are bent downward to form a flow channel for airflow to diffuse to both sides and then flow downward; The fixing column is installed on the arc-shaped steel sheet and is placed on the upper surface of the arc-shaped steel sheet; The fixing columns are arranged along the length direction of the arc-shaped steel sheet, and the arc-shaped steel sheet is installed and fixed on the furnace body through the fixing columns; The first back cover is mounted on a high upper surface of the arc-shaped steel sheet; The second back cover is installed on another high upper surface of the arc-shaped steel sheet.

2. The uniformly heated tunnel drying furnace according to claim 1, characterized in that: The cross section of the arc-shaped steel sheet is a spliced ​​shape of three "C" shapes, which are respectively a large C shape with an opening facing upward, and a first small C shape and a second small C shape with an opening facing downward; The first back cover is fixed to the upper surface of the first small C-shape of the arc-shaped steel sheet; The second back cover is fixed on the upper surface of the second small C-shape of the arc-shaped steel sheet.

3. The uniformly heated tunnel drying furnace according to claim 2, characterized in that: The cross-sections of the first back cover and the second back cover are respectively "C"-shaped; The cross-sectional area of ​​the first back cover is smaller than the cross-sectional area of ​​the first small C-shape of the arc-shaped steel sheet; The cross-sectional area of ​​the second back cover is smaller than the cross-sectional area of ​​the second small C-shape of the arc-shaped steel sheet; The first back cover is buckled on the arc-shaped steel sheet to form a first space; The second back cover is buckled on the arc-shaped steel sheet to form a second space.

4. The uniformly heated tunnel drying furnace according to claim 2, characterized in that: The heat dispersion assembly also includes a diffusion plate; The diffusion plate is installed above the arc-shaped steel sheet, and the diffusion plate is installed above the first small C-shape and above the second small C-shape respectively; The diffusion plate is placed horizontally, and the length direction of the diffusion plate is consistent with the length direction of the slit.

5. The uniformly heated tunnel drying furnace according to claim 4, characterized in that: At room temperature, the center point of one end of the arc-shaped steel sheet corresponds to the midpoint of the width direction of the diffusion plate; the center point of the other end of the arc-shaped steel sheet corresponds to the midpoint of the other diffusion plate in the width direction.

6. The uniformly heated tunnel drying furnace according to claim 5, characterized in that: The heat dissipation assembly further comprises a diffusion sheet; the cross section of the diffusion sheet is in the shape of an arc, and the arc is convex downward, and the diffusion sheet is buckled on the diffusion plate; The two diffusion plates above the same arc-shaped steel sheet are respectively installed with the diffusion plates, one of which is located at one end of the one diffusion plate, and the other diffusion plate is located at the other end of the other diffusion plate; The diffusion sheet corresponds to the outer side of the arc-shaped steel sheet.

7. The uniformly heated tunnel drying furnace according to any one of claims 1 to 6, characterized in that: A limiting plate is formed on the partition plate, and two limiting plates are respectively installed on both sides of the slit; The length direction of the limiting plate is consistent with the length direction of the slit; A limiting channel is formed between the two paired limiting plates; The limiting channel is located directly below the middle of the arc-shaped steel sheet.

8. The uniformly heated tunnel drying furnace according to claim 7, characterized in that: The air outlet duct includes a first air duct, a second air duct, and a main duct; The first air duct is installed above the air inlet end of the furnace body; The second air duct is installed above the other end of the air inlet end of the furnace body; The inner diameter of the second air duct is greater than the inner diameter of the first air duct; The first air duct and the second air duct are respectively connected to the main pipe, and the airflows discharged from the first air duct and the second air duct are collected and then drawn out from the main pipe; The end of the main pipe is connected to the exhaust system; The end of the air inlet pipe is connected to the air blower.

9. The uniformly heated tunnel drying furnace according to claim 8, characterized in that: Baffles with a plurality of micro-circular holes are respectively installed at the inlets of the first air duct and the second air duct.

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