Radiant tunnel oven

Abstract

The application belongs to the technical field of baking equipment, and provides a radiation type tunnel oven, which makes up for the deficiencies of low heat transfer efficiency and uneven heating of the blank in the existing radiation type tunnel oven by arranging an upper air outlet mechanism and a lower air outlet mechanism on the upper side of the upper radiation heating mechanism and the lower side of the lower radiation heating mechanism respectively. Meanwhile, the air distribution mechanism can adjust the air volume ratio flowing to the upper air outlet mechanism and the lower air outlet mechanism, so that the operator can flexibly adjust the convection heating intensity ratio of the upper and lower areas according to the baking requirements of different product categories, and differential control of heat distribution is realized. In addition, the air outlet pipe is arranged in a structure capable of rotating around its own axis, the air outlet pipe is driven to rotate by the driving part to adjust the orientation of the air outlet port, so that the action direction of the convection airflow relative to the radiation heating pipe and the blank is adjustable, further enriching the adjustment means of heat distribution, and then enabling the oven to more finely regulate and control the heat distribution form in the oven cavity, adapting to different baking process requirements.

Description

Technical Field

[0001] This invention belongs to the field of baking equipment technology, specifically relating to 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, and during operation, they heat and bake the raw materials 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 transfer within the oven cavity is relatively simple, with weak hot air convection and low heat transfer efficiency. This can easily lead to uneven heating of the raw materials, making it difficult to ensure the consistency of the baked product quality. At the same time, the heat distribution within the oven cavity is relatively fixed and uniform. It is impossible to adjust the heat ratio between the upper and lower zones according to the baking needs of different product categories. The equipment has poor process adaptability and cannot meet the diversified and refined baking production needs. Summary of the Invention

[0004] The present invention provides a radiant tunnel oven, which aims to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a radiant tunnel oven, comprising an oven body and an upper radiant heating mechanism and a lower radiant heating mechanism disposed within the oven cavity of the oven body, and further comprising: The upper air outlet mechanism and the lower air outlet mechanism are respectively located on the upper side of the upper radiant heating mechanism and the lower side of the lower radiant heating mechanism. Both the upper air outlet mechanism and the lower air outlet mechanism include multiple air outlet pipes spaced apart along the length of the furnace body. The circulating fan has its air inlet connected to the furnace cavity; An air distribution mechanism is connected to the air outlet of the circulating fan and to the air outlet pipes of 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. The air outlet pipe is rotatably mounted on the furnace body. One end is provided with an air inlet that communicates with the air distribution mechanism, and the other end is provided with a drive unit. Multiple air outlets are spaced apart along the length of the side. The drive unit is used to bear torque and drive the air outlet pipe to rotate.

[0006] In one possible implementation of the radiant tunnel oven provided by the present invention, the air outlet pipe has a rotating sealing part at one end where the air inlet is located, and the rotating sealing part passes through the oven wall of the oven body and is rotatingly and sealingly connected to the oven body.

[0007] In one possible implementation of the radiant tunnel oven provided by the present invention, the rotating sealing part includes: The flange is fixedly connected to the air outlet pipe and abuts against the outer side of the furnace wall; The top sleeve is spaced apart at one end of the flange facing the drive unit, fixedly connected to the air outlet pipe, and abuts against the inner side of the furnace wall; A wear-resistant sealing gasket is fitted onto the flange on the side facing the top sleeve.

[0008] In one possible implementation of the radiant tunnel oven provided by the present invention, the air outlet duct includes: The first branch pipe is fixedly connected to the flange and the top sleeve; The second branch pipe has one end connected to the first branch pipe and the other end provided with the drive unit, and the air outlet is provided on the second branch pipe; A connecting sleeve is fitted onto the junction of the first branch pipe and the second branch pipe, and is detachably connected to the first branch pipe and the second branch pipe.

[0009] In one possible implementation of the radiant tunnel oven provided by the present invention, the air outlet pipe is provided with a plurality of air nozzles, each of which corresponds to an air outlet and is connected at one end to the air outlet.

[0010] In one possible implementation of the radiant tunnel oven 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.

[0011] In one possible implementation of the radiant tunnel oven provided by the present invention, the communication 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.

[0012] In one possible implementation of the radiant tunnel oven provided by the present invention, the main air chamber is provided with an upper air outlet on the upper side and a lower air outlet on the lower side at the tail end. The adjustment mechanism includes: The adjusting plate has one end rotatably mounted inside the main air cavity 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. A drive mechanism is located outside the main air cavity and connected to the rotating shaft to drive the adjustment plate to rotate.

[0013] In one possible implementation of the radiant tunnel oven provided by the present invention, the driving mechanism includes a driving plate, one end of which is fixedly connected to the rotating shaft, and the projection of the driving plate on the axis of the rotating shaft coincides with the projection of the adjusting plate on the axis of the rotating shaft.

[0014] In one possible implementation of the radiant tunnel oven provided by the present invention, the adjusting mechanism further includes a locking mechanism, the locking mechanism comprising: A limiting plate is fixedly connected to the furnace body, and multiple limiting holes are spaced apart along an arc path centered on the rotating shaft on its side. The limiting holes correspond one-to-one with the 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.

[0015] 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 setting an upper air outlet mechanism on the upper side of the upper radiant heating mechanism and a lower air outlet mechanism on the lower side of the lower radiant heating mechanism, and by having a circulating fan draw high-temperature air from the oven cavity and distribute it through an air distribution mechanism before sending it into each air outlet pipe, adds a forced convection auxiliary heating method on the basis of radiant heating. The air outlet mechanisms on both the upper and lower sides ensure that the upper and lower surfaces of the billet can receive auxiliary convection heating, overcoming the shortcomings of existing radiant tunnel ovens that rely solely on radiant heat exchange, have low heat transfer efficiency, and produce uneven heating of the billet, thus improving heating efficiency and the consistency of baking quality.

[0016] Meanwhile, the air distribution mechanism can adjust the air volume ratio between the upper and lower air outlet mechanisms, allowing operators to flexibly adjust the convective heating intensity ratio between the upper and lower areas according to the baking needs of different product categories. This achieves differentiated control of heat distribution, making up for the shortcomings of existing ovens where the heat distribution pattern in the oven cavity is fixed and singular and the heat ratio between the upper and lower areas cannot be adjusted. This improves the equipment's process adaptability to diversified and refined baking production needs.

[0017] Furthermore, the air outlet duct is designed to rotate around its own axis. A drive unit rotates the duct to adjust the direction of the air outlet, allowing for adjustable airflow direction relative to the radiant heating tubes and the workpiece. This further enriches the methods for adjusting heat distribution. Operators can not only adjust the upper and lower airflow ratio through the air distribution mechanism, but also change the airflow pattern in each section by rotating the air outlet ducts to alter the direction of the air outlets. This achieves dual adjustability of airflow distribution and direction, enabling the oven to more precisely control the heat distribution within the oven cavity, adapting to different baking process requirements and improving baking quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of a radiant tunnel oven provided in an embodiment of the present invention; Figure 2 For along Figure 1 Cross-sectional view of line AA in the middle; Figure 3 for Figure 2 Enlarged view of part A in the image; Figure 4 A three-dimensional structural diagram of the upper air outlet mechanism, lower air outlet mechanism, and air distribution mechanism in the radiant tunnel oven provided in the embodiment of the present invention, with the partial sealing plate of the air distribution mechanism removed; Figure 5 for Figure 4 Enlarged view of part B in the image; Figure 6 A three-dimensional structural diagram of the air outlet pipe in a radiant tunnel oven provided in an embodiment of the present invention; Figure 7 for Figure 6 Enlarged view of section C in the image; Explanation of reference numerals in the attached figures: 10. Upper air outlet mechanism; 20. Lower air outlet mechanism; 30. Air outlet duct; 31. First branch duct; 32. Second branch pipe; 33. Connecting sleeve; 34. Nozzle; 35. Drive unit; 36. Indicator unit; 37. Rotary sealing part; 371. Flange; 372. Wear-resistant sealing gasket; 373. Top sleeve; 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. Upper radiant heating mechanism; 73. Lower radiant heating mechanism; 74. Conveying mechanism. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Please refer to the following: Figures 1 to 7 The radiant tunnel oven provided by the present invention will now be described. The radiant tunnel oven includes an oven body 71 and an upper radiant heating mechanism 72 and a lower radiant heating mechanism 73 disposed in the oven cavity of the oven body 71. It also 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 disposed above the upper radiant heating mechanism 72 and below the lower radiant heating mechanism 73. Both the upper air outlet mechanism 10 and the lower air outlet mechanism 20 include a plurality of air outlet pipes 30 spaced apart along the length of the oven body 71. The air inlet end of the circulating fan 40 is connected to the oven cavity. The air distribution mechanism is connected to the air outlet end of the circulating fan 40 and to 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.

[0027] Among them, such as Figure 2 and Figure 3As shown, the air outlet pipe 30 is rotatably mounted on the furnace body 71. One end is provided with an air inlet that is connected to the air distribution mechanism, and the other end is provided with a drive unit 35. Multiple air outlets are spaced apart along the length of the side. The drive unit 35 is used to bear torque and drive the air outlet pipe 30 to rotate.

[0028] It should be noted that, in this embodiment, the radiant tunnel oven also includes a conveying mechanism 74 that runs through the oven cavity. The billet is placed on the conveying surface of the conveying mechanism 74 (such as the upper surface of a breathable metal conveyor belt, such as a stainless steel mesh belt, stainless steel eyeglass mesh belt, or chain conveyor belt) and enters from one end of the oven cavity and exits from the other end, completing the baking process. The oven body 71 has an oven cavity, and the conveying mechanism 74 runs through the oven cavity. The baking area is within a preset height range above the conveying surface. The upper radiant heating mechanism 72 consists of multiple radiant heating tubes and is located above the baking area to radiate heat to the upper surface of the billet; the lower radiant heating mechanism 73 consists of multiple radiant heating tubes and is located below the baking area (i.e., below the conveying surface) to radiate heat to the lower surface of the billet. The double-sided radiant heating allows the billet to receive heat radiation from both directions simultaneously.

[0029] like Figure 2 As shown, the upper air outlet mechanism 10 is located above the upper radiant heating mechanism 72 (i.e., the side facing away from the baking area), and the lower air outlet mechanism 20 is located below the lower radiant heating mechanism 73 (i.e., the side facing away from 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 furnace body 71 (i.e., the billet conveying direction). The air outlet pipes 30 are arranged sequentially along the length of the furnace cavity, covering different baking sections of the furnace cavity. The airflow from the upper air outlet mechanism 10 passes through the gaps between the upper radiant heating pipes and reaches the upper surface of the billet, while the airflow from the lower air outlet mechanism 20 passes through the gaps between the lower radiant heating pipes and reaches the lower surface of the billet. Auxiliary convection heating is applied to both the upper and lower surfaces.

[0030] The air inlet of the circulating fan 40 is connected to the furnace cavity, drawing high-temperature air heated by the radiant heating tubes from the furnace cavity. The air outlet of the circulating fan 40 is connected to the air outlet pipes 30 of the upper air outlet mechanism 10 and the lower air outlet mechanism 20 through the air distribution mechanism, sending the pressurized high-temperature airflow into each air outlet pipe 30 of the upper and lower air outlet mechanisms 20 respectively.

[0031] 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. It is used to distribute the airflow ratio between the upper outlet mechanism 10 and the lower outlet mechanism 20. The air distribution mechanism allows the operator to adjust the airflow distribution ratio between the upper and lower outlet mechanisms 20 according to the baking process requirements, thereby changing the convective heating intensity ratio of the upper and lower surfaces of the blank.

[0032] like Figure 2 , Figure 6 and Figure 7 As shown, it should be noted that the air outlet duct 30 in this embodiment is not fixedly installed, but rotatably mounted on the furnace body 71. One end of the air outlet duct 30 has an air inlet communicating with the air distribution mechanism, and the other end has a drive unit 35. Multiple air nozzles are spaced apart along the length of the side of the air outlet duct 30. The drive unit 35 (a rod-like structure with a handwheel, a hexagonal prism rod-like structure, or a rod-like structure with a handle, etc.) is used to withstand the torque of the operator, driving the air outlet duct 30 to rotate around its own axis and adjust the orientation of the air nozzles. When the air outlet duct 30 rotates, the orientation of each air nozzle changes accordingly, thereby changing the direction of the airflow from the air nozzle relative to the radiant heating tube and the billet. Furthermore, the end of the drive unit 35 has an indicator 36 to indicate the rotation angle. The indicator 36 is a groove or protrusion at the end of the drive unit 35, and a scale can also be provided on the furnace wall to clearly display the rotation angle of the air outlet 30.

[0033] For example, when the air outlet is directed towards the radiant heating tube, the airflow directly hits the surface of the radiant heating tube, passes through the gaps between the tubes, and reaches the surface of the billet. At this time, the heat exchange between the convective airflow and the radiant heating tube is strong, and the airflow reaches a higher temperature when it reaches the billet. When the air outlet duct 30 is rotated, causing the air outlet to deflect at a certain angle, the airflow is blown out at an angle. The intensity and path of the heat exchange with the radiant heating tube change, and the temperature and velocity distribution of the airflow reaching the billet surface also change accordingly. Operators can adjust the convective airflow by rotating the air outlet duct 30 to change the direction of the air outlet, according to the process requirements of different products or different baking stages.

[0034] The beneficial effects of the radiant tunnel oven provided by the present invention are as follows: Compared with the prior art, the radiant tunnel oven provided by the present invention, by setting an upper air outlet mechanism 10 and a lower air outlet mechanism 20 on the upper side of the upper radiant heating mechanism 72 and the lower side of the lower radiant heating mechanism 73 respectively, draws high-temperature air from the oven cavity by a circulating fan 40 and distributes it through an air distribution mechanism before sending it into each air outlet pipe 30, thereby adding a forced convection auxiliary heating method on the basis of radiant heating, which makes up for the shortcomings of the existing radiant tunnel ovens that rely solely on radiant heat exchange, have low heat transfer efficiency, and uneven heating of the billet.

[0035] The air distribution mechanism can adjust the air volume ratio of the upper air outlet mechanism 10 and the lower air outlet mechanism 20, allowing operators to flexibly adjust the convective heating intensity ratio of the upper and lower areas according to the baking needs of different product categories, thereby achieving differentiated control of heat distribution and improving the process adaptability of the equipment.

[0036] Meanwhile, the air outlet duct 30 is designed to rotate around its own axis. The drive unit 35 drives the air outlet duct 30 to rotate and adjust the direction of the air outlet, which further enriches the means of heat distribution adjustment. Operators can not only adjust the ratio of upper and lower air volume through the air distribution mechanism, but also adjust the airflow action mode of each section by rotating each air outlet duct 30 to change the direction of the air outlet. This achieves dual adjustability of air volume distribution and airflow direction, thereby enabling the oven to more precisely control the heat distribution pattern in the oven cavity to adapt to different baking process requirements and improve baking quality.

[0037] like Figure 1 and Figure 2 As shown, in a specific embodiment of the radiant tunnel oven provided in this invention, the air outlet pipe 30 is provided with a rotating sealing part 37 at one end with an air inlet. The rotating sealing part 37 passes through the oven wall of the oven body 71 and is rotatably and sealingly connected to the oven body 71.

[0038] It should be noted that in this embodiment, a rotating seal 37 is provided at the end of the air outlet duct 30 where the air inlet is located (i.e., the end connected to the air distribution mechanism). The air outlet duct 30 passes through the furnace wall of the furnace body 71, with the end where the air inlet is located on the outside of the furnace wall and connected to the air distribution mechanism, and the other end (the end where the drive part 35 is located) located inside the furnace cavity. The rotating seal 37 enables the air outlet duct 30 to form a rotating seal connection with the furnace body 71 at the position where it passes through the furnace wall. That is, while the air outlet duct 30 can rotate around its own axis, it maintains a sealed fit with the furnace wall, preventing high-temperature gas in the furnace cavity from leaking to the outside of the furnace cavity through the gap between the air outlet duct 30 and the furnace wall, and also preventing external cold air from entering the furnace cavity through this gap and affecting the stability of the baking temperature.

[0039] In this embodiment, by setting a rotating sealing part 37 at one end of the air outlet pipe 30 with an air inlet, the air outlet pipe 30 forms a rotating sealing connection with the furnace body 71 at the position where it passes through the furnace wall. While the air outlet pipe 30 rotates around its own axis to adjust the direction of the air outlet, it maintains a good sealing fit with the furnace wall, preventing the leakage of high-temperature gas in the furnace cavity and the entry of external cold air, thus ensuring the stability of the temperature environment in the furnace cavity and the sealed circulation of the internal airflow.

[0040] like Figure 2 As shown, in a specific embodiment of the radiant tunnel oven provided in this invention, the rotating sealing part 37 includes a flange 371, a top sleeve 373, and a wear-resistant sealing sleeve. The flange 371 is fixedly connected to the air outlet pipe 30 and abuts against the outer side of the oven wall. The top sleeve 373 is spaced apart at one end of the flange 371 facing the drive part 35, fixedly connected to the air outlet pipe 30, and abuts against the inner side of the oven wall. The wear-resistant sealing gasket 372 is fitted onto the side of the flange 371 facing the top sleeve 373.

[0041] It should be noted that in this embodiment, the furnace wall is clamped between the flange 371 (through the wear-resistant sealing gasket 372) and the top sleeve 373, and the furnace wall is clamped from both sides along the axial direction.

[0042] Preferably, a first tightening bolt is provided on one radial side of the top sleeve 373. The first tightening bolt is screwed to the top sleeve 373 and abuts against the air outlet pipe 30, thereby fixing the top sleeve 373 onto the air outlet pipe 30.

[0043] The wear-resistant sealing gasket 372 is made of a high-temperature resistant, wear-resistant material with a certain degree of elasticity (such as a graphite gasket or a flexible graphite composite gasket). It is fitted onto the side of the flange 371 facing the top sleeve 373, that is, sandwiched between the end face of the flange 371 and the outer side of the furnace wall. The elasticity and flexibility of the wear-resistant sealing gasket 372 can fill the microscopic uneven gaps between the end face of the flange 371 and the outer side of the furnace wall, improving the sealing fit. Its wear-resistant properties can withstand the continuous sliding friction between the flange 371 and the furnace wall during the rotation of the air duct 30, reducing the wear on the end face of the flange 371 and the outer side of the furnace wall, and extending the service life of the rotating sealing part 37. The wear-resistant sealing gasket 372 is a consumable part and can be replaced separately after it wears to a certain extent, without the need to replace the flange 371 or the furnace wall or other major components.

[0044] In this embodiment, the rotating seal 37 adopts a combination structure of flange 371, top sleeve 373, and wear-resistant sealing gasket 372. Flange 371 and top sleeve 373 clamp the furnace wall axially from the outside and inside sides, ensuring reliable axial positioning of the exhaust pipe 30 and preventing axial movement, while allowing the exhaust pipe 30 to rotate freely around its own axis. The wear-resistant sealing gasket 372 is sandwiched between flange 371 and the furnace wall. Its elasticity and flexibility improve the sealing fit and reduce the risk of high-temperature gas leakage. Its wear-resistant properties extend the service life of the rotating seal 37, and as a vulnerable part, it can be replaced separately, resulting in low maintenance costs.

[0045] like Figure 2 and Figure 6 As shown, in a specific embodiment of the radiant tunnel oven provided in this invention, the air outlet pipe 30 includes a first branch pipe 31, a second branch pipe 32, and a connecting sleeve 33. The first branch pipe 31 is fixedly connected to the flange 371 and the top sleeve 373. One end of the second branch pipe 32 is connected to the first branch pipe 31, and the other end is provided with a driving part 35. The air outlet is provided on the second branch pipe 32. The connecting sleeve 33 is sleeved at the connection between the first branch pipe 31 and the second branch pipe 32 and is detachably connected to the first branch pipe 31 and the second branch pipe 32.

[0046] It should be noted that in this embodiment, the air outlet duct 30 adopts a split structure, consisting of three parts: a first branch duct 31, a second branch duct 32, and a connecting sleeve 33. The first branch duct 31 is fixedly connected to the flange 371 and the top sleeve 373, meaning that the first branch duct 31 passes through the furnace wall, and the portion passing through the furnace wall is axially positioned and rotatedly sealed by the flange 371 and the top sleeve 373. One end of the first branch duct 31 is located outside the furnace wall and communicates with the air distribution mechanism, while the other end is located inside the furnace cavity.

[0047] The second branch pipe 32 is located inside the oven cavity, with one end connected to the end of the first branch pipe 31 located inside the oven cavity, and the other end equipped with a drive unit 35. All air outlets are located on the second branch pipe 32, placing them directly near the baking area inside the oven cavity. A connecting sleeve 33 is fitted onto the joint between the first branch pipe 31 and the second branch pipe 32, and is detachably connected to both the first and second branch pipes (e.g., by threaded connection, clamp connection, etc.), connecting the two branch pipes into a single unit. This allows the drive unit 35 to drive the first branch pipe 31 to rotate around its axis via the second branch pipe 32 and the connecting sleeve 33.

[0048] Preferably, the connecting sleeve 33 is provided with at least two second tightening bolts on its side, which pass through the connecting sleeve 33 and abut against the first branch pipe 31 and the second branch pipe 32 respectively, so as to achieve a fixed connection between the first branch pipe 31, the second branch pipe 32 and the connecting sleeve 33.

[0049] The split structure reduces the assembly difficulty of the air outlet duct 30: the assembly of the first branch duct 31 with the flange 371 and the top sleeve 373 is completed at the furnace wall, and the assembly of the second branch duct 32 with the drive unit 35 is completed inside the furnace cavity. After the two parts are installed in place, they can be connected by the connecting sleeve 33. At the same time, when a branch duct needs to be repaired or replaced, the detachable connecting sleeve 33 can be removed to handle the branch duct separately.

[0050] In this embodiment, the air outlet duct 30 adopts a split structure consisting of a first branch pipe 31, a second branch pipe 32, and a connecting sleeve 33. This reduces the assembly difficulty of the air outlet duct 30 within the furnace body 71. Each branch pipe can be installed separately and then connected via the connecting sleeve 33, making assembly convenient. The split structure facilitates individual maintenance and replacement of each branch pipe, reducing maintenance costs and difficulty. The air outlet is located on the second branch pipe 32 inside the furnace cavity, placing the air outlet directly near the baking area. This results in a short airflow path, which is beneficial for ensuring effective convection heating.

[0051] like Figure 2 and Figure 6 As shown, in a specific embodiment of the radiant tunnel oven provided in this invention, the air outlet duct 30 is provided with a plurality of air nozzles 34, each corresponding to an air outlet, and one end of each nozzle is connected to an air outlet.

[0052] It should be noted that in this embodiment, each air outlet of each air duct 30 is also connected to a nozzle 34, with each nozzle 34 corresponding to one air outlet. One end of the nozzle 34 is connected to the air outlet, and the other end extends outward from the wall of the air duct 30. The nozzle 34 ensures that the airflow blowing from the air outlet is no longer a scattered airflow that diffuses freely along the radial direction of the air duct 30, but is guided and constrained by the nozzle 34 and ejected in a more concentrated direction with a smaller cross-sectional area. The cross-section of the nozzle 34 can be designed as circular, rectangular, or tapered, etc. A tapered nozzle 34 can further increase the airflow velocity and enhance the ability of the airflow to penetrate the gaps in the radiant heating tubes.

[0053] When the air outlet duct 30 rotates around its own axis, each air nozzle 34 rotates together with the air outlet duct 30 and the air inlet, and the air outlet direction of the air nozzle 34 changes accordingly. This makes the effect of rotation adjustment on changing the airflow direction more significant and precise, and thus more effectively controls the temperature distribution in the furnace cavity.

[0054] In this embodiment, by setting a nozzle 34 on the air outlet, the blown airflow is guided and concentrated, causing the airflow to be ejected in a more concentrated direction, thereby improving the convective heat transfer intensity and efficiency between the airflow and the surface of the radiant heating tube and the surface of the billet. When the nozzle 34 rotates with the air outlet pipe 30, the change in the air outlet direction of the nozzle 34 makes the adjustment effect of the airflow angle more significant and precise, further enhancing the control capability of the adjustable angle function of the air outlet pipe 30 for the convective heating effect.

[0055] like Figure 4 and Figure 5 As shown, in a specific embodiment of the radiant tunnel oven 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.

[0056] 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.

[0057] 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, and realize the on-demand adjustment of the heat distribution in the upper and lower areas.

[0058] like Figure 4 and Figure 5 As shown, in a specific embodiment of the radiant tunnel oven provided in this invention, 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.

[0059] It should be noted that in this embodiment, 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 on the lower 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 lower air outlet mechanism 20 are all 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.

[0060] The main air chamber 51 serves as the main airflow distribution channel, guiding the airflow from the circulating fan 40 to both the upper air chamber 52 and the lower air chamber 53. The upper air chamber 52 and the lower air chamber 53 then distribute the airflow to their respective multiple outlet ducts 30. This three-stage chamber structure of main air chamber 51-upper air chamber 52-lower air chamber 53 achieves graded airflow distribution.

[0061] 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. 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. The airflow path is intuitive, and the structural layout is reasonable.

[0062] like Figure 5 As shown, in a specific embodiment of the radiant tunnel oven 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.

[0063] 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.

[0064] 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.

[0065] When the regulating plate 61 rotates to approach or abut against the upper side wall of the main air chamber 51, it reduces or blocks the flow area of ​​the upper air outlet, allowing more airflow to flow from the lower air outlet into the lower air chamber 53, thus increasing the air volume of the lower air outlet mechanism 20. When the regulating plate 61 rotates to approach or abut against the lower side wall of the main air chamber 51, it reduces or blocks the flow area of ​​the lower air outlet, allowing more airflow to flow from the upper air outlet into the upper air chamber 52, thus increasing the air volume of the upper air outlet mechanism 10. By rotating the regulating plate 61 to any angle in the middle, continuous proportional adjustment of the upper and lower air volumes can be achieved.

[0066] The drive mechanism is located on the outside of the main air chamber 51 and connected to the rotating shaft. It drives the rotating shaft to rotate, thereby causing the adjusting plate 61 to rotate. The drive mechanism can be a manual knob, handwheel, or electric actuator. The operator can adjust the angle of the adjusting plate 61 inside the main air chamber 51 from outside the furnace body 71 by operating the drive mechanism.

[0067] 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 air volume distribution between the upper and lower parts is achieved. When the adjusting plate 61 rotates in the vertical plane, the air volume is continuously adjusted by changing the flow area ratio of the upper and lower air outlets. The operation is intuitive and the adjustment accuracy is high. The drive mechanism is located outside the main air cavity 51, and the operator can complete the adjustment from outside the furnace body 71, making the operation convenient and safe.

[0068] like Figure 5 As shown, in a specific embodiment of the radiant tunnel oven provided in this invention, the driving mechanism includes a driving plate 62, one end of which is fixedly connected to a rotating shaft, and the projection of the driving plate 62 on the axis of the rotating shaft coincides with the projection of the adjusting plate 61 on the axis of the rotating shaft.

[0069] It should be noted that in this embodiment, 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. The drive plate 62 is fixedly connected to the rotating shaft, and 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 via the rotating shaft. The drive plate 62 serves as an external 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.

[0070] The projection of the drive plate 62 onto the axis of rotation coincides with the projection of the adjustment plate 61 onto the axis of rotation. That is, the drive plate 62 and the adjustment plate 61 are at the same angular position when projected onto the axis of rotation, and their angular positions around the axis are identical. This design allows operators to directly determine the current angular position of the adjustment plate 61 inside the main air chamber 51 by observing the angular position of the drive plate 62 from the outside, eliminating the need for additional angle markings or indicator structures. Operators can intuitively understand the current distribution of airflow between the upper and lower sections.

[0071] 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 chamber 51 to rotate via the rotating shaft, making the operation simple and intuitive. The projections of the drive plate 62 and the adjusting plate 61 on the axis of the rotating shaft coincide, allowing the operator to directly determine the current angle of the internal adjusting plate 61 by observing the angle position of the drive plate 62 from the outside. No additional angle markings or indication structures are required, facilitating precise adjustment to the target position according to the baking process requirements and improving the accuracy of angle adjustment and ease of operation.

[0072] like Figure 4 and Figure 5As shown, in a specific embodiment of the radiant tunnel oven provided in this invention, the adjustment mechanism further includes a locking mechanism. The locking mechanism includes a limiting plate 63 and a limiting rod 64. The limiting plate 63 is fixedly connected to the oven body 71. Multiple limiting holes 631 are spaced apart along an arc-shaped path centered on the rotating shaft on the side. The limiting holes 631 correspond one-to-one with the rotation angle of the adjustment plate 61. The limiting rod 64 is provided with a threaded section, which 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.

[0073] It should be noted that, in this embodiment, the limiting plate 63 is fixedly connected to the furnace body 71 (specifically, the outer wall of the furnace body 71 or the outer shell of the air distribution mechanism). Multiple limiting holes 631 are spaced apart along an arc-shaped path centered on the rotation axis on the side of the limiting plate 63. Each limiting hole 631 is arranged at equal angles or at preset angles along the arc-shaped path, and the position of each limiting hole 631 corresponds one-to-one with a specific rotation angle of the adjusting plate 61.

[0074] The limiting rod 64 has a threaded section that passes through a through hole in the drive plate 62 and is screwed onto the drive plate 62. One end of the limiting rod 64 can be inserted into the limiting hole 631. The other end of the limiting rod 64 is equipped with a handwheel to facilitate the operator to rotate the limiting rod 64.

[0075] 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 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 then 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 locking. The high-speed airflow inside the main air chamber 51 will generate a continuous impact force on the adjusting plate 61. The locking mechanism ensures that the adjusting plate 61 can remain at the set angle without deviation after 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.

[0076] In this embodiment, the locking mechanism employs a structure where multiple limiting holes 631 on the limiting plate 63 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, preventing the adjusting plate 61 from deflecting on its own under the long-term impact of airflow, thus ensuring the continuous stability of the upper and lower airflow distribution ratio. The threaded engagement between the limiting rod 64 and the drive plate 62 ensures the reliability of the locking mechanism and prevents the limiting rod 64 from coming off its own in a vibration environment. The multiple limiting holes 631 provide the operator with several preset angles for quick locking, making operation convenient and the structure simple and reliable.

[0077] 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 radiant tunnel oven, comprising an oven body (71) and an upper radiant heating mechanism (72) and a lower radiant heating mechanism (73) disposed within the oven cavity of the oven body (71), characterized in that, Also includes: The upper air outlet mechanism (10) and the lower air outlet mechanism (20) are respectively located on the upper side of the upper radiant heating mechanism (72) and the lower side of the lower radiant heating mechanism (73). 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 circulating fan (40) has its air inlet end connected to the furnace cavity; The air distribution mechanism is connected to the air outlet of the circulating fan (40) and to 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); The air outlet pipe (30) is rotatably mounted on the furnace body (71). One end is provided with an air inlet that communicates with the air distribution mechanism, and the other end is provided with a drive unit (35). Multiple air outlets are provided at intervals along the length direction on the side. The drive unit (35) is used to bear torque and drive the air outlet pipe (30) to rotate.

2. The radiant tunnel oven as described in claim 1, characterized in that, The air outlet pipe (30) has a rotating sealing part (37) at one end where the air inlet is located. The rotating sealing part (37) passes through the furnace wall of the furnace body (71) and is rotatably and sealingly connected to the furnace body (71).

3. The radiant tunnel oven as described in claim 2, characterized in that, The rotating sealing part (37) includes: The flange (371) is fixedly connected to the air outlet pipe (30) and abuts against the outer side of the furnace wall; The top sleeve (373) is spaced apart at one end of the flange (371) facing the drive part (35), and is fixedly connected to the air outlet pipe (30) and abuts against the inner side of the furnace wall; A wear-resistant sealing gasket (372) is fitted onto the flange (371) on the side facing the top sleeve (373).

4. The radiant tunnel oven as described in claim 3, characterized in that, The air outlet pipe (30) includes: The first branch pipe (31) is fixedly connected to the flange (371) and the top sleeve (373); The second branch pipe (32) has one end connected to the first branch pipe (31) and the other end is provided with the drive unit (35). The air outlet is provided on the second branch pipe (32). The connecting sleeve (33) is fitted at the junction of the first branch pipe (31) and the second branch pipe (32) and is detachably connected to the first branch pipe (31) and the second branch pipe (32).

5. The radiant tunnel oven as described in any one of claims 1-4, characterized in that, The air outlet pipe (30) is provided with multiple air nozzles (34), each of which corresponds to an air outlet and is connected at one end to the air outlet.

6. The radiant tunnel oven 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).

7. The radiant tunnel oven as described in claim 6, 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).

8. The radiant tunnel oven as described in claim 7, 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: The adjusting plate (61) has one end 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.

9. The radiant tunnel oven as described in claim 8, characterized in that, The driving mechanism includes a driving plate (62), one end of which is fixedly connected to the rotating shaft. The projection of the driving plate (62) on the axis of the rotating shaft coincides with the projection of the adjusting plate (61) on the axis of the rotating shaft.

10. The radiant tunnel oven as described in claim 9, characterized in that, The adjusting mechanism further includes a locking mechanism, which includes: The limiting plate (63) is fixedly connected to the furnace body (71), and multiple limiting holes (631) are provided on the side along an arc path with the rotating shaft as the center. 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).

Images