Radiant tunnel oven heat secondary distribution device and radiant tunnel oven

Abstract

The present application belongs to the technical field of baking equipment, and provides a radiation type tunnel oven heat secondary distribution device and a radiation type tunnel oven. The upper air outlet mechanism and the lower air outlet mechanism are respectively arranged on the upper and lower sides of the baking area, the high-temperature air in the oven cavity is extracted by the circulating fan, the air volume ratio of the air flowing to the upper and lower air outlet mechanisms is adjusted by the air distribution mechanism, and then the air is sent into each air outlet pipe. After being blown out through the air outlet, the upper and lower surfaces of the blank are subjected to auxiliary convection heating. On the basis of radiation heating, the secondary distribution of heat is realized, and the fixed heat distribution form in the oven cavity of the existing radiation type tunnel oven and the poor process adaptability are compensated. The air distribution mechanism can adjust the air volume ratio of the air flowing to the upper and lower air outlet mechanisms, so that the operator can flexibly adjust the convection heating intensity distribution of the upper and lower surfaces of the blank according to the process requirements of different products or different baking stages. The differential control of heat distribution is realized, and the adaptability of the oven to different baking processes is improved.

Description

Technical Field

[0001] This invention belongs to the field of baking equipment technology, specifically relating to a radiant tunnel oven heat secondary distribution device and a radiant tunnel oven. Background Technology

[0002] A radiant tunnel oven is a continuous baking equipment widely used in the food baking industry. Its basic structure includes an oven body, an oven cavity inside the oven body, a conveying mechanism running through the oven cavity, and a radiant heating mechanism. The radiant heating mechanism typically consists of multiple radiant heating tubes arranged at intervals along the length of the oven cavity. The radiant heating tubes are positioned above and / or below the conveying mechanism to heat and bake the blanks moving on the conveying mechanism through thermal radiation.

[0003] Existing conventional radiant tunnel ovens rely solely on the heat radiation emitted by radiant heating tubes to heat the raw materials. The heat distribution pattern within the oven cavity is relatively fixed, which cannot adapt to the differentiated heat distribution requirements of different products and different baking stages, resulting in poor process adaptability. Summary of the Invention

[0004] The present invention provides a heat secondary distribution device for a radiant tunnel oven and a radiant tunnel oven, which aims to solve the technical problems described in the background art above.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, embodiments of the present invention provide a secondary heat distribution device for a radiant tunnel oven, comprising: The upper air outlet mechanism and the lower air outlet mechanism are respectively located on the upper and lower sides of the baking area. Both the upper air outlet mechanism and the lower air outlet mechanism include multiple air outlet pipes spaced apart along the length of the oven body. One end of each air outlet pipe is provided with an air inlet, and multiple air outlets are spaced apart along its own axial direction on the side. The circulating fan has an air outlet end connected to the upper air outlet mechanism and the lower air outlet mechanism, and an air inlet end connected to the furnace cavity of the furnace body. The air distribution mechanism is connected to the air outlet of the circulating fan and to the air inlet of the air outlet pipe in the upper air outlet mechanism and the lower air outlet mechanism, and is used to distribute the airflow to the upper air outlet mechanism and the lower air outlet mechanism.

[0006] In conjunction with the first aspect, in one possible implementation of the radiant tunnel oven heat secondary distribution device provided by the present invention, the air distribution mechanism includes: The connecting mechanism is connected to the air outlet of the circulating fan and to the air inlet of the air outlet pipe in the upper air outlet mechanism and the lower air outlet mechanism. An adjustment mechanism, connected to the connecting mechanism, is used to adjust the airflow to the upper air outlet mechanism and the lower air outlet mechanism.

[0007] In conjunction with the first aspect, in one possible implementation of the radiant tunnel oven heat secondary distribution device provided by the present invention, the connecting mechanism includes: The main air chamber is connected at its front end to the air outlet of the circulating fan; An upper air chamber is located above the main air chamber and is connected to the main air chamber; the air inlet of the air outlet pipe in the upper air outlet mechanism is connected to the upper air chamber. The lower air chamber is located below the main air chamber and is connected to the main air chamber. The air inlet of the air outlet pipe in the lower air outlet mechanism is connected to the lower air chamber.

[0008] In conjunction with the first aspect, in one possible implementation of the radiant tunnel oven heat secondary distribution device provided by the present invention, the upper side of the tail end of the main air chamber is provided with an upper air outlet and the lower side is provided with a lower air outlet. The adjustment mechanism includes: An adjusting plate, one end of which is rotatably disposed at the tail end inside the main air cavity via a rotating shaft, and the other end of which extends away from the tail end, having the freedom to rotate in the vertical plane and abut against the upper or lower side wall of the main air cavity; A drive mechanism is located outside the main air cavity and connected to the rotating shaft to drive the adjustment plate to rotate.

[0009] In conjunction with the first aspect, in one possible implementation of the radiant tunnel oven heat secondary distribution device provided by the present invention, the driving mechanism includes a driving plate, one end of which is fixedly connected to the rotating shaft.

[0010] In conjunction with the first aspect, in one possible implementation of the radiant tunnel oven heat secondary distribution device provided by the present invention, the projection of the drive plate on the axis of rotation coincides with the projection of the adjustment plate on the axis of rotation.

[0011] In conjunction with the first aspect, in one possible implementation of the radiant tunnel oven heat secondary distribution device provided by the present invention, the adjustment mechanism further includes a locking mechanism, which is connected to the main air chamber and the drive mechanism to lock the position of the adjustment plate.

[0012] In conjunction with the first aspect, in one possible implementation of the radiant tunnel oven heat secondary distribution device provided by the present invention, the locking mechanism includes: A limiting plate is fixedly installed, and multiple limiting holes are spaced apart on its side along an arc-shaped path centered on the pivot axis. Each limiting hole corresponds to a rotation angle of the adjusting plate. A limiting rod is provided, the limiting rod has a threaded section, the threaded section passes through the drive plate and is screwed to the drive plate; one end of the limiting rod is used to be inserted into the limiting hole.

[0013] In conjunction with the first aspect, in one possible implementation of the radiant tunnel oven heat secondary distribution device provided by the present invention, the air outlet pipe is provided with a plurality of air nozzles, each corresponding to an air outlet, and one end of each air nozzle is connected to an air outlet.

[0014] Secondly, embodiments of the present invention provide a radiant tunnel oven, including an oven body, a radiant heating mechanism, and a conveying mechanism. The oven body has an oven cavity, and the conveying mechanism has a conveying surface for conveying raw materials. The conveying surface penetrates the oven cavity, and a baking area is located within a preset height above the conveying surface. The invention is characterized by including the aforementioned radiant tunnel oven heat secondary distribution device. The upper air outlet mechanism and the lower air outlet mechanism of the radiant tunnel oven heat secondary distribution device are located inside the oven cavity and connected to the oven body; the air distribution mechanism is connected to the outside of the oven body.

[0015] The beneficial effects of the radiant tunnel oven heat secondary distribution device and radiant tunnel oven provided by this invention are as follows: Compared with the prior art, the radiant tunnel oven heat secondary distribution device and radiant tunnel oven provided by this invention, by setting upper and lower air outlet mechanisms on the upper and lower sides of the baking area respectively, and drawing high-temperature air from the oven cavity by a circulating fan, adjusting the air volume ratio of the upper and lower air outlet mechanisms by the air distribution mechanism, and then sending it into each air outlet pipe, and blowing it out through the air outlet to assist in the convection heating of the upper and lower surfaces of the blank, achieve secondary heat distribution on the basis of radiant heating, making up for the shortcomings of existing radiant tunnel ovens that rely solely on radiant heating, have a fixed heat distribution pattern in the oven cavity, and have poor process adaptability. The air distribution mechanism can adjust the air volume ratio of the upper and lower air outlet mechanisms, allowing operators to flexibly adjust the convective heating intensity distribution of the upper and lower surfaces of the blank according to the process requirements of different products or different baking stages, realizing differentiated control of heat distribution and improving the oven's adaptability to different baking processes. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the heat secondary distribution device for a radiant tunnel oven provided in an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the radiant tunnel oven heat secondary distribution device provided in an embodiment of the present invention after removing the partial sealing plate of the connecting mechanism. Figure 3 for Figure 2 Enlarged view of part A in the image; Figure 4 This is a schematic diagram of the main structure of a radiant tunnel oven provided in an embodiment of the present invention; Figure 5 For along Figure 4 Cross-sectional view of line AA in the middle; Explanation of reference numerals in the attached figures: 10. Upper air outlet mechanism; 20. Lower air outlet mechanism; 30. Air outlet duct; 31. Air nozzle; 40. Circulating fan; 50. Connecting mechanism; 51. Main air chamber; 52. Upper air chamber; 53. Lower air chamber; 61. Adjusting plate; 62. Drive plate; 63. Limiting plate; 631. Limiting hole; 64. Limiting rod; 71. Furnace body; 72. Radiant heating tube; 73. Conveying mechanism. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is actually illustrative only and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0021] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0022] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0024] Please refer to the following: Figures 1 to 3The present invention will now describe the heat secondary distribution device for a radiant tunnel oven. The radiant tunnel oven heat secondary distribution device includes an upper air outlet mechanism 10 and a lower air outlet mechanism 20, a circulating fan 40, and an air distribution mechanism. The upper air outlet mechanism 10 and the lower air outlet mechanism 20 are respectively located on the upper and lower sides of the baking area. Both the upper air outlet mechanism 10 and the lower air outlet mechanism 20 include multiple air outlet pipes 30 spaced apart along the length of the oven body 71. One end of each air outlet pipe 30 has an air inlet, and multiple air outlets are spaced apart along its axial direction on its side. The air outlet end of the circulating fan 40 is connected to the upper air outlet mechanism 10 and the lower air outlet mechanism 20, and the air inlet end is connected to the oven cavity of the oven body 71. The air distribution mechanism is connected to the air outlet end of the circulating fan 40 and to the air inlet of the air outlet pipes 30 in the upper air outlet mechanism 10 and the lower air outlet mechanism 20, and is used to distribute the airflow to the upper air outlet mechanism 10 and the lower air outlet mechanism 20.

[0025] It should be noted that in this embodiment, the heat secondary distribution device is applied to a radiant tunnel oven, and is used to distribute the heat in the oven cavity in a secondary manner by means of forced convection circulating airflow on the basis of radiant heating tube 72, so as to adapt to the differentiated heat distribution requirements of different products and different baking stages.

[0026] The upper air outlet mechanism 10 and the lower air outlet mechanism 20 are respectively located on the upper and lower sides of the baking area. It should be noted that the baking area refers to the space above the conveying surface of the conveying mechanism 73 used for placing and heating the billet. The upper air outlet mechanism 10 is located above the baking area (i.e., the space above or on the side of the radiant heating tube 72 facing away from the baking area), and the lower air outlet mechanism 20 is located below the baking area (i.e., the space below the radiant heating tube 72 below the conveying surface). The upper air outlet mechanism 10 applies convective airflow to the upper surface of the billet from above, and the lower air outlet mechanism 20 applies convective airflow to the lower surface of the billet from below. The presence of air outlet mechanisms on both the upper and lower sides ensures that convective heating covers both the upper and lower surfaces of the billet.

[0027] Both the upper air outlet mechanism 10 and the lower air outlet mechanism 20 include multiple air outlet pipes 30 spaced apart along the length of the furnace body 71. The air outlet pipes 30 are arranged sequentially and spaced apart along the length of the furnace cavity (i.e., the direction of billet conveying), covering different sections of the furnace cavity. Each air outlet pipe 30 has an air inlet at one end and multiple air outlets spaced apart along its axial direction on its side. After the airflow enters the air outlet pipe 30 through the air inlet, it is evenly blown out from the air outlets on the side of the pipe, convectively heating the billet in the corresponding section.

[0028] The air inlet of the circulating fan 40 is connected to the furnace cavity of the furnace body 71, and draws high-temperature air from the furnace cavity; the air outlet of the circulating fan 40 is connected to the upper air outlet mechanism 10 and the lower air outlet mechanism 20, and sends the pressurized airflow into the air outlet pipes 30 of the upper air outlet mechanism 10 and the lower air outlet mechanism 20.

[0029] The air distribution mechanism is connected to the outlet of the circulating fan 40 and to the inlet of each outlet pipe 30 in the upper outlet mechanism 10 and the lower outlet mechanism 20, and is used to distribute the airflow to the upper outlet mechanism 10 and the lower outlet mechanism 20. The air distribution mechanism can adjust the airflow ratio entering the upper outlet mechanism 10 and the lower outlet mechanism 20, so that the operator can increase the airflow ratio above or below according to the baking process requirements, thereby changing the distribution of convective heating intensity on the upper and lower surfaces.

[0030] It should be noted that in this embodiment, the high-temperature air drawn from the furnace cavity by the circulating fan 40 has already been heated to a relatively high temperature by the radiant heating tube 72. This high-temperature air is then sent by the circulating fan 40 into the upper and lower air outlet mechanisms 20, and blown out from the air outlets to the surface of the billet. This provides auxiliary convective heating to the billet on top of radiant heating, achieving a secondary distribution of heat. By adjusting the airflow distribution between the upper and lower air outlet mechanisms 20 through the air distribution mechanism, the ratio of convective heat obtained by the upper and lower surfaces can be changed, thereby adapting to the differentiated heat distribution requirements of different products or different baking stages.

[0031] The beneficial effects of the radiant tunnel oven heat secondary distribution device provided by this invention are as follows: Compared with the prior art, the radiant tunnel oven heat secondary distribution device provided by this invention, by setting an upper air outlet mechanism 10 and a lower air outlet mechanism 20 on the upper and lower sides of the baking area respectively, and drawing high-temperature air from the oven cavity by a circulating fan 40, adjusting the airflow ratio of the upper and lower air outlet mechanisms 20 by the air distribution mechanism, and then sending it into each air outlet pipe 30, after being blown out through the air outlet, provides auxiliary convection heating to the upper and lower surfaces of the blank. This achieves secondary heat distribution based on radiant heating, overcoming the shortcomings of existing radiant tunnel ovens that rely solely on radiant heating, have a fixed heat distribution pattern within the oven cavity, and poor process adaptability. The air distribution mechanism can adjust the airflow ratio of the upper and lower air outlet mechanisms 20, allowing operators to flexibly adjust the convective heating intensity distribution of the upper and lower surfaces of the blank according to the process requirements of different products or different baking stages, achieving differentiated control of heat distribution and improving the oven's adaptability to different baking processes.

[0032] like Figure 2 and Figure 3 As shown, in a specific embodiment of the radiant tunnel oven heat secondary distribution device provided in this invention, the air distribution mechanism includes a connecting mechanism 50 and an adjusting mechanism. The connecting mechanism 50 is connected to the air outlet of the circulating fan 40 and to the air inlet of the air outlet pipe 30 in the upper air outlet mechanism 10 and the lower air outlet mechanism 20. The adjusting mechanism is connected to the connecting mechanism 50 and is used to adjust the air volume flowing into the upper air outlet mechanism 10 and the lower air outlet mechanism 20.

[0033] It should be noted that in this embodiment, the air distribution mechanism consists of two parts: a connecting mechanism 50 and an adjusting mechanism. The connecting mechanism 50 is the airflow channel, with one end connected to the air outlet of the circulating fan 40, and the other end connected to the air inlets of the air outlet pipes 30 in the upper air outlet mechanism 10 and the lower air outlet mechanism 20, respectively, forming a complete airflow channel from the circulating fan 40 to the upper and lower air outlet mechanisms 20. The adjusting mechanism is connected to the connecting mechanism 50 and is used to adjust the proportion of airflow distributed in the two directions of the upper air outlet mechanism 10 and the lower air outlet mechanism 20 within the connecting mechanism 50. By manipulating the adjusting mechanism, the operator can increase the airflow of the upper air outlet mechanism 10 while decreasing the airflow of the lower air outlet mechanism 20, or vice versa, thereby changing the ratio of convective heating intensity on the upper and lower surfaces of the billet and achieving differentiated control of the heat distribution on the upper and lower surfaces.

[0034] In this embodiment, the air distribution mechanism adopts a combination structure of a connecting mechanism 50 and an adjusting mechanism. The connecting mechanism 50 provides a complete airflow channel, and the adjusting mechanism enables controllable adjustment of the airflow distribution ratio between the upper and lower air outlet mechanisms 20. This structure allows operators to flexibly adjust the airflow distribution of the upper and lower air outlet mechanisms 20 according to the baking process requirements, change the convective heating intensity ratio of the upper and lower surfaces of the blank, realize on-demand heat distribution, and improve the oven's adaptability to different baking processes.

[0035] Preferred, such as Figure 2 and Figure 3 As shown, the connecting mechanism 50 includes a main air chamber 51, an upper air chamber 52, and a lower air chamber 53. The front end of the main air chamber 51 is connected to the air outlet of the circulating fan 40. The upper air chamber 52 is located on the upper side of the main air chamber 51 and is connected to the main air chamber 51. The air inlet of the air outlet pipe 30 in the upper air outlet mechanism 10 is connected to the upper air chamber 52. The lower air chamber 53 is located on the lower side of the main air chamber 51 and is connected to the main air chamber 51. The air inlet of the air outlet pipe 30 in the lower air outlet mechanism 20 is connected to the lower air chamber 53.

[0036] It should be noted that in this embodiment, the connecting mechanism 50 consists of three parts: a main air chamber 51, an upper air chamber 52, and a lower air chamber 53. The main air chamber 51 is the main body of the connecting mechanism 50, and its front end (i.e., the airflow inlet end) is connected to the air outlet end of the circulating fan 40 to receive the high-pressure airflow discharged by the circulating fan 40. The upper air chamber 52 is located on the upper side of the main air chamber 51 and is connected to the inner cavity of the main air chamber 51. The air inlets of each air outlet pipe 30 in the upper air outlet mechanism 10 are all connected to the upper air chamber 52. The airflow flowing from the main air chamber 51 into the upper air chamber 52 is distributed by the upper air chamber 52 and then enters each air outlet pipe 30. The lower air chamber 53 is located below the main air chamber 51 and is connected to the inner cavity of the main air chamber 51. The air inlets of each air outlet pipe 30 in the lower air outlet mechanism 20 are connected to the lower air chamber 53. The airflow flowing from the main air chamber 51 into the lower air chamber 53 is distributed by the lower air chamber 53 and then enters each air outlet pipe 30.

[0037] The main air chamber 51, the upper air chamber 52 and the lower air chamber 53 are all assembled from metal plates by welding, riveting and bolting.

[0038] The main air chamber 51 serves as the main airflow distribution channel, guiding the airflow from the circulating fan 40 to the upper air chamber 52 and the lower air chamber 53 respectively. The upper air chamber 52 and the lower air chamber 53 then distribute the airflow to their respective multiple air outlet ducts 30. This three-stage cavity structure of main air chamber 51-upper air chamber 52-lower air chamber 53 achieves graded airflow distribution: the first stage is achieved by the main air chamber 51 distributing the total airflow to the upper and lower directions; the second stage is achieved by the upper air chamber 52 and the lower air chamber 53 distributing the airflow in their respective directions to the respective air outlet ducts 30.

[0039] In this embodiment, the connecting mechanism 50 adopts a three-stage cavity structure consisting of a main air cavity 51, an upper air cavity 52, and a lower air cavity 53. The main air cavity 51 serves as the main distribution channel, guiding the airflow discharged from the circulating fan 40 to the upper air cavity 52 and the lower air cavity 53, respectively. The upper air cavity 52 and the lower air cavity 53 then distribute the airflow to the corresponding air outlet ducts 30. This hierarchical distribution structure makes the airflow distribution hierarchy clear, and the volume and shape of each cavity can be designed separately to optimize the uniformity of airflow distribution. At the same time, the upper air cavity 52 and the lower air cavity 53 are located above and below the main air cavity 51, respectively, corresponding to the vertical layout of the baking area, making the airflow path intuitive and the structural layout reasonable.

[0040] In another embodiment, the connecting mechanism 50 may also include a main pipe and an upper branch pipe and a lower branch pipe connected to the main pipe. The main pipe is connected to the air outlet of the circulating fan, the upper branch pipe is connected to each air outlet pipe 30 in the upper air outlet mechanism 10, and the lower branch pipe is connected to each air outlet pipe 30 in the lower air outlet mechanism 20.

[0041] At this time, the regulating mechanism includes valves respectively installed on the upper branch pipe and the lower branch pipe, which control the opening degree of the upper branch pipe and the lower branch pipe respectively. Alternatively, the regulating mechanism may also include valves installed at the air inlet end of each air outlet pipe 30, which control the opening degree of each air outlet pipe 30 respectively.

[0042] In another embodiment, the connecting mechanism can also be a main air chamber, which is connected to the air outlet of the circulating fan 40 and connected to each air outlet duct 30.

[0043] At this time, the regulating mechanism includes valves located at the air inlet end of each air outlet duct 30, which control the opening degree of each air outlet duct 30 respectively.

[0044] Preferred, such as Figure 2 and Figure 3 As shown, in a specific embodiment of the radiant tunnel oven heat secondary distribution device provided in this invention, the main air chamber 51 has an upper air outlet on the upper side and a lower air outlet on the lower side.

[0045] The adjustment mechanism includes an adjustment plate 61 and a drive mechanism. One end of the adjustment plate 61 is rotatably mounted inside the main air cavity 51 at the tail end via a rotating shaft, and the other end extends away from the tail end, having the freedom to rotate in the vertical plane and abut against the upper or lower side wall of the main air cavity 51. The drive mechanism is located outside the main air cavity 51 and is connected to the rotating shaft to drive the adjustment plate 61 to rotate.

[0046] It should be noted that in this embodiment, the upper side of the tail end of the main air cavity 51 (i.e., the end of the airflow along the flow direction of the main air cavity 51) is provided with an upper air outlet, and the lower side is provided with a lower air outlet. The upper air outlet is connected to the upper air cavity 52, and the airflow flows into the upper air cavity 52 through the upper air outlet; the lower air outlet is connected to the lower air cavity 53, and the airflow flows into the lower air cavity 53 through the lower air outlet.

[0047] The regulating mechanism includes an regulating plate 61 and a driving mechanism. One end of the regulating plate 61 is rotatably mounted at the tail end inside the main air cavity 51 via a rotating shaft, and the other end extends away from the tail end (i.e., toward the airflow inlet at the front end of the main air cavity 51). The regulating plate 61 can rotate around the rotating shaft in a vertical plane. When the regulating plate 61 rotates closer to or abuts against the upper side wall of the main air cavity 51, the regulating plate 61 blocks or reduces the flow area of ​​the upper air outlet, allowing more airflow to flow into the lower air cavity 53 from the lower air outlet, increasing the airflow of the lower air outlet mechanism 20 and decreasing the airflow of the upper air outlet mechanism 10; when the regulating plate 61 rotates closer to or abuts against the lower side wall of the main air cavity 51, the regulating plate 61 blocks or reduces the flow area of ​​the lower air outlet, allowing more airflow to flow into the upper air cavity 52 from the upper air outlet, increasing the airflow of the upper air outlet mechanism 10 and decreasing the airflow of the lower air outlet mechanism 20. By rotating the adjustment plate 61 to any angle in the middle, the vertical air volume can be continuously adjusted proportionally.

[0048] The drive mechanism can be a manual knob, handwheel, or electric actuator. Operators can adjust the angle of the adjustment plate 61 inside the main air chamber 51 from outside the furnace body 71 by operating the drive mechanism, without having to enter the furnace chamber to operate.

[0049] In this embodiment, by setting upper and lower air outlets on the upper and lower sides of the tail end of the main air cavity 51 respectively, and by setting an adjusting plate 61 that can rotate around a pivot inside the main air cavity 51, continuous and adjustable upper and lower air volume distribution is achieved. When the adjusting plate 61 rotates in the vertical plane, it simultaneously changes the flow area ratio of the upper and lower air outlets, realizing synchronous and continuous proportional adjustment of the air volume of the upper air outlet mechanism 10 and the lower air outlet mechanism 20, which is convenient to operate. The drive mechanism is located outside the main air cavity 51, and the operator can complete the adjustment from outside the furnace body 71, which is convenient and does not require entering the furnace cavity. This adjustment method makes the control of secondary heat distribution flexible and can precisely adapt to the process requirements of different products and different baking stages.

[0050] like Figure 2 and Figure 3 As shown, in a specific embodiment of the radiant tunnel oven heat secondary distribution device provided in this invention, the driving mechanism includes a driving plate 62, one end of which is fixedly connected to a rotating shaft.

[0051] It should be noted that in this embodiment, the drive mechanism is implemented using a drive plate 62. One end of the drive plate 62 is fixedly connected to the rotating shaft and is located on the outside of the main air cavity 51. Since the drive plate 62 is fixedly connected to the rotating shaft, when the operator rotates the drive plate 62, the drive plate 62 drives the adjusting plate 61 inside the main air cavity 51 to rotate synchronously through the rotating shaft. The drive plate 62 serves as the operating handle for adjusting the angle of the adjusting plate 61. The operator can directly move the drive plate 62 from the outside of the main air cavity 51 to change the angle of the adjusting plate 61, thereby adjusting the vertical airflow distribution.

[0052] In this embodiment, the drive mechanism adopts a structure in which the drive plate 62 is fixedly connected to the rotating shaft. The drive plate 62 serves as an external operating handle. By moving the drive plate 62, the operator can synchronously drive the adjusting plate 61 inside the main air cavity 51 to rotate via the rotating shaft, making the operation simple and intuitive. The drive plate 62 is located outside the main air cavity 51, so the operator does not need to come into contact with the airflow and high-temperature environment inside the main air cavity 51, making the operation safe and convenient.

[0053] like Figure 2 and Figure 3 As shown, in a specific embodiment of the radiant tunnel oven heat secondary distribution device provided in this invention, the projection of the drive plate 62 on the axis of rotation coincides with the projection of the adjustment plate 61 on the axis of rotation.

[0054] It should be noted that in this embodiment, the projection of the drive plate 62 along the axis of rotation coincides with the projection of the adjustment plate 61 along the axis of rotation. That is, the drive plate 62 and the adjustment plate 61 are at the same angular position when the axis of rotation is taken as the projection direction, and their angular positions around the axis of rotation are consistent. This setting allows the operator to directly determine the current angular position of the adjustment plate 61 inside the main air cavity 51 by observing the angular position of the drive plate 62 from the outside. The angle indication of the drive plate 62 is the same as the angle indication of the adjustment plate 61, and the current position of the adjustment plate 61 can be intuitively understood without additional angle markings or indication structures.

[0055] In this embodiment, the projections of the drive plate 62 and the adjustment plate 61 on the axis of rotation coincide, allowing the operator to directly determine the current angle of the internal adjustment plate 61 by observing the angle position of the drive plate 62 from the outside. This eliminates the need for additional angle markings or indicator structures, enabling the operator to intuitively understand the current distribution status of the upper and lower air volumes. This facilitates precise adjustment to the target position according to the baking process requirements, improving the accuracy of angle adjustment and ease of operation.

[0056] like Figure 2 and Figure 3 As shown, in a specific embodiment of the radiant tunnel oven heat secondary distribution device provided in this invention, the adjustment mechanism further includes a locking mechanism, which is connected to the main air chamber 51 and the drive mechanism to lock the position of the adjustment plate 61.

[0057] It should be noted that in this embodiment, the adjustment mechanism also includes a locking mechanism. The locking mechanism is connected to the main air chamber 51 and the drive mechanism, and is used to lock the position of the adjustment plate 61 after it has been adjusted to the target angle, preventing the adjustment plate 61 from deflecting on its own under the impact of airflow. The high-speed airflow inside the main air chamber 51 will generate continuous impact and vibration on the adjustment plate 61. If the adjustment plate 61 is not locked, its angle may shift under the long-term action of the airflow, causing the upper and lower airflow distribution to deviate from the set value, affecting the stability of the baking process. The locking mechanism ensures that the adjustment plate 61 remains at the set angle after locking, guaranteeing the continuous stability of the upper and lower airflow distribution ratio.

[0058] In this embodiment, by setting a locking mechanism, the position of the adjusting plate 61 is locked after it is adjusted to the target angle, preventing the adjusting plate 61 from deflecting on its own under the long-term action of airflow impact force, ensuring the continuous stability of the upper and lower air volume distribution ratio, avoiding fluctuations in the baking process caused by air volume distribution deviation, and facilitating stable control of baking quality.

[0059] like Figure 2 and Figure 3 As shown, in a specific embodiment of the radiant tunnel oven heat secondary distribution device provided in this invention, the locking mechanism includes a limiting plate 63 and a limiting rod 64. The limiting plate 63 is fixedly arranged, and a plurality of limiting holes 631 are spaced apart on its side along an arc-shaped path centered on the rotating shaft. The limiting holes 631 correspond one-to-one with the rotation angle of the adjusting plate 61. The limiting rod 64 is provided with a threaded section, which passes through the driving plate 62 and is screwed to the driving plate 62. One end of the limiting rod 64 is used to be inserted into the limiting hole 631.

[0060] It should be noted that in this embodiment, the limiting holes 631 are arranged at equal angles or at preset angles along the arc path, and the position of each limiting hole 631 corresponds one-to-one with a specific rotation angle of the adjusting plate 61. The limiting rod 64 is provided with a threaded section, which passes through the through hole on the drive plate 62 and is screwed to the drive plate 62. One end of the limiting rod 64 (the end with the threaded section) can be inserted into the limiting hole 631.

[0061] The operation is as follows: When the adjusting plate 61 is adjusted to the target angle, the position on the drive plate 62 corresponding to that angle is precisely aligned with the corresponding limiting hole 631 on the side of the limiting plate 63. The operator pushes one end of the limiting rod 64 into the limiting hole 631 along the threaded section. After the limiting rod 64 is inserted into the limiting hole 631, it restricts the rotation of the drive plate 62, and in turn restricts the rotation of the adjusting plate 61 through the rotating shaft, thus achieving angle locking. The threaded section on the limiting rod 64 is screwed to the drive plate 62, so that the limiting rod 64 will not come out on its own after being inserted into the limiting hole 631, ensuring the reliability of the locking. When unlocking is required, the operator unscrews the limiting rod 64 to remove it from the limiting hole 631, thereby restoring the rotational freedom of the drive plate 62 and the adjusting plate 61, and performing a new angle adjustment.

[0062] Furthermore, a handwheel is provided at the end of the limit rod to facilitate rotation.

[0063] In this embodiment, the locking mechanism employs a structure in which multiple limiting holes 631 arranged along an arc-shaped path engage with limiting rods 64. Each limiting hole 631 corresponds one-to-one with a specific rotation angle of the adjusting plate 61. After the limiting rod 64 is inserted into the limiting hole 631, the angular position of the adjusting plate 61 can be precisely locked. This structure is simple, reliable, and easy to operate. The threaded engagement between the limiting rod 64 and the drive plate 62 ensures the reliability of the locking and prevents the limiting rod 64 from coming off on its own in a vibration environment. The arrangement of multiple limiting holes 631 provides the operator with several preset angles for quick locking, while also allowing continuous adjustment within the angle range between any two adjacent limiting holes 631, thus balancing the needs for rapid positioning and fine adjustment.

[0064] like Figure 1 and Figure 3 As shown, in a specific embodiment of the radiant tunnel oven heat secondary distribution device provided in this invention, the air outlet pipe 30 is provided with a plurality of air nozzles 31, each corresponding to an air outlet, and one end of each nozzle is connected to an air outlet.

[0065] It should be noted that in this embodiment, a nozzle 31 is also connected to each air outlet of each air outlet 30, with each nozzle 31 corresponding to one air outlet. One end of the nozzle 31 is connected to the air outlet, and the other end extends outward from the wall of the air outlet 30. The nozzle 31 prevents the airflow from the air outlet from being a freely diffused airflow along the radial direction of the air outlet 30, but instead guides and constrains it, causing it to be ejected in a more concentrated direction. The cross-section of the nozzle 31 can be designed as circular, rectangular, or tapered, with tapered nozzles further increasing the airflow velocity. The guiding and concentrating effect of the nozzle 31 allows the airflow to reach the surface of the billet at a higher speed and in a concentrated direction, enhancing the intensity of convective heat transfer. Simultaneously, the length and direction of the nozzle 31 can be designed according to process requirements, allowing for precise control of the airflow's exit direction and arrival position.

[0066] In this embodiment, by installing nozzles 31 on each air outlet of the air outlet duct 30, the blown airflow is guided and concentrated, causing the airflow to be directed towards the surface of the billet at a higher speed and in a concentrated direction. This improves the convective heat transfer intensity and efficiency between the airflow and the billet, enhancing the auxiliary convective heating effect of the secondary heat distribution device on the billet. The length and direction of the nozzles 31 can be designed according to process requirements, facilitating precise control of the airflow's exit direction and position, further improving the controllability of convective heating and the consistency of baking quality.

[0067] Please refer to the following: Figure 4 and Figure 5 Based on the same inventive concept, this embodiment of the invention also provides a radiant tunnel oven, including an oven body 71, a radiant heating mechanism, and a conveying mechanism 73. The oven body 71 has an oven cavity, and the conveying mechanism 73 has a conveying surface for conveying raw materials (such as the upper surface of a breathable metal conveyor belt, such as a stainless steel mesh belt or a stainless steel eyeglass mesh belt). The conveying surface penetrates the oven cavity, and the baking area is located within a preset height above the conveying surface. The invention is characterized by including the aforementioned radiant tunnel oven heat secondary distribution device. The upper air outlet mechanism 10 and the lower air outlet mechanism 20 of the radiant tunnel oven heat secondary distribution device are located inside the oven cavity and connected to the oven body 71; the air distribution mechanism is connected to the outside of the oven body 71.

[0068] It should be noted that, in this embodiment, the radiant tunnel oven includes a furnace body 71, a radiant heating mechanism, a conveying mechanism 73, and the aforementioned secondary heat distribution device. The furnace body 71 contains a furnace cavity, which is a heating space extending along the tunnel direction. The conveying mechanism 73 has a conveying surface (such as the upper surface of a breathable metal conveyor belt like a stainless steel mesh belt, stainless steel eyeglass mesh belt, or chain conveyor belt) for conveying the billet. The conveying surface extends through the furnace cavity along the tunnel direction. The billet is placed on the conveying surface and enters from one end of the furnace cavity and exits from the other end, completing the baking process. A preset height range above the conveying surface is defined as the baking area. The radiant heating mechanism includes multiple radiant heating tubes 72, which are arranged at intervals along the length of the furnace cavity and positioned above and / or below the conveying surface to heat the billet within the baking area through thermal radiation.

[0069] The upper air outlet mechanism 10 and lower air outlet mechanism 20 of the secondary heat distribution device are both located inside the oven cavity and connected to the inner wall or internal support structure of the oven body 71, respectively located above and below the baking area. The air distribution mechanism is located on the outside of the oven body 71 and connected to the outer wall of the oven body 71. Because the air distribution mechanism is located outside the oven body 71, the operator can easily adjust the upper and lower air volume distribution ratio from outside the oven body 71 through the adjustment mechanism of the air distribution mechanism (such as the drive plate 62), without having to enter the high-temperature oven cavity to operate.

[0070] Furthermore, the radiant heating mechanism includes an upper radiant heating tube 72 and a lower radiant heating tube 72 respectively located on the upper and lower sides of the baking area. The upper air outlet mechanism 10 is located on the upper side of the upper radiant heating tube 72 and the lower air outlet mechanism 20 is located on the lower side of the lower radiant heating tube 72, so as to improve the heating efficiency of the blank while performing secondary separation of heat.

[0071] The beneficial effects of the radiant tunnel oven provided by this invention are as follows: Compared with the prior art, the radiant tunnel oven provided by this invention, by integrating the aforementioned secondary heat distribution device into the radiant tunnel oven, adds an adjustable proportion of forced convection auxiliary heating method on the basis of radiant heating tube 72. The upper air outlet mechanism 10 and the lower air outlet mechanism 20 are located on the upper and lower sides of the baking area, respectively, so that the upper and lower surfaces of the blank can receive auxiliary convection heating, which makes up for the shortcomings of existing radiant tunnel ovens that rely solely on fixed radiant heat exchange, have a fixed heat distribution pattern, and poor process adaptability. The air distribution mechanism can flexibly adjust the air volume distribution ratio between the upper and lower air outlet mechanisms 20, allowing operators to differentiate the convective heating intensity of the upper and lower surfaces of the blank according to the process requirements of different products and different baking stages, realizing the on-demand secondary distribution of heat distribution, improving the oven's adaptability to different baking processes and the controllability of baking quality. The upper air outlet mechanism 10 and the lower air outlet mechanism 20 are located inside the furnace cavity, resulting in a short airflow path and minimal heat loss; the air distribution mechanism is located outside the furnace body 71, making operation convenient and eliminating the need to enter the high-temperature furnace cavity.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A secondary heat distribution device for a radiant tunnel oven, characterized in that, include: The upper air outlet mechanism (10) and the lower air outlet mechanism (20) are respectively located on the upper and lower sides of the baking area. Both the upper air outlet mechanism (10) and the lower air outlet mechanism (20) include multiple air outlet pipes (30) spaced apart along the length of the oven body (71). One end of each air outlet pipe (30) is provided with an air inlet, and multiple air outlets are spaced apart along its own axial direction on the side. The circulating fan (40) has an air outlet end connected to the upper air outlet mechanism (10) and the lower air outlet mechanism (20), and an air inlet end connected to the furnace cavity of the furnace body (71). The air distribution mechanism is connected to the air outlet of the circulating fan (40) and to the air inlet of the air outlet pipe (30) in the upper air outlet mechanism (10) and the lower air outlet mechanism (20), and is used to distribute the air volume flowing to the upper air outlet mechanism (10) and the lower air outlet mechanism (20).

2. The radiant tunnel oven heat secondary distribution device as described in claim 1, characterized in that, The air distribution mechanism includes: The connecting mechanism (50) is connected to the air outlet of the circulating fan (40) and to the air inlet of the air outlet pipe (30) in the upper air outlet mechanism (10) and the lower air outlet mechanism (20); An adjustment mechanism, connected to the connecting mechanism (50), is used to adjust the airflow to the upper air outlet mechanism (10) and the lower air outlet mechanism (20).

3. The radiant tunnel oven heat secondary distribution device as described in claim 2, characterized in that, The connecting mechanism (50) includes: The main air chamber (51) is connected at its front end to the air outlet of the circulating fan (40); The upper air chamber (52) is located on the upper side of the main air chamber (51) and is connected to the main air chamber (51). The air inlet of the air outlet pipe (30) in the upper air outlet mechanism (10) is connected to the upper air chamber (52). The lower air chamber (53) is located below the main air chamber (51) and is connected to the main air chamber (51). The air inlet of the air outlet pipe (30) in the lower air outlet mechanism (20) is connected to the lower air chamber (53).

4. The radiant tunnel oven heat secondary distribution device as described in claim 3, characterized in that, The main air chamber (51) has an upper air outlet on the upper side and a lower air outlet on the lower side at its tail end; The adjustment mechanism includes: Adjustment plate (61), one end of which is rotatably disposed at the tail end inside the main air cavity (51) via a rotating shaft, and the other end extends away from the tail end, having the freedom to rotate in the vertical plane and abut against the upper or lower side wall of the main air cavity (51); The drive mechanism is located outside the main air chamber (51) and connected to the rotating shaft to drive the adjustment plate (61) to rotate.

5. The radiant tunnel oven heat secondary distribution device as described in claim 4, characterized in that, The driving mechanism includes a driving plate (62), one end of which is fixedly connected to the rotating shaft.

6. The radiant tunnel oven heat secondary distribution device as described in claim 5, characterized in that, The projection of the drive plate (62) on the axis of rotation coincides with the projection of the adjustment plate (61) on the axis of rotation.

7. The radiant tunnel oven heat secondary distribution device as described in any one of claims 5-6, characterized in that, The adjustment mechanism also includes a locking mechanism, which is connected to the main air chamber (51) and the drive mechanism to lock the position of the adjustment plate (61).

8. The radiant tunnel oven heat secondary distribution device as described in claim 7, characterized in that, The locking mechanism includes: The limiting plate (63) is fixedly installed, and multiple limiting holes (631) are provided on its side along an arc path centered on the rotating shaft. The limiting holes (631) correspond one-to-one with the rotation angle of the adjusting plate (61). The limiting rod (64) has a threaded section that passes through the drive plate (62) and is screwed to the drive plate (62); one end of the limiting rod (64) is used to be inserted into the limiting hole (631).

9. The radiant tunnel oven heat secondary distribution device as described in claim 1, characterized in that, The air outlet pipe (30) is provided with multiple air nozzles (31), each of which corresponds to an air outlet and is connected at one end to the air outlet.

10. A radiant tunnel oven, comprising an oven body (71), a radiant heating mechanism, and a conveying mechanism (73), wherein the oven body (71) has an oven cavity, and the conveying mechanism (73) has a conveying surface for conveying raw materials, the conveying surface penetrating the oven cavity, and a baking area within a predetermined height above the conveying surface, characterized in that, The device includes a radiant tunnel oven heat secondary distribution device as described in any one of claims 1-9, wherein the upper air outlet mechanism (10) and the lower air outlet mechanism (20) of the radiant tunnel oven heat secondary distribution device are disposed in the oven cavity and connected to the oven body (71); the air distribution mechanism is connected to the outside of the oven body (71).

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