A tunnel furnace

Abstract

The utility model belongs to tunnel furnace technical field, concretely relates to a tunnel furnace, including the cavity of inside formation has the casing and the heating device of heating for the cavity in casing, casing top is equipped with the fan, the cavity in casing is connected through with the fan air outlet, the cavity in casing is equipped with the conveying device for conveying the baking piece, still be equipped with the air duct in the casing, be equipped with the fan hole on the air duct, the fan hole is connected with the air outlet of fan, still be provided with the air pipe hole of through of the air duct, be equipped with the air pipe in the air duct, the air pipe passes through the air pipe hole and the air duct is arranged in horizontal direction cross, the part of air pipe in the air pipe hole is equipped with the air inlet, one end of air pipe and conveying device adjacent is equipped with the air outlet. Through the setting of above -mentioned component, promote the heating uniformity of large -size leather tunnel furnace, reduce the heat loss.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel furnace technology, and specifically relates to a tunnel furnace. Background Technology

[0002] In the leather manufacturing industry, tunnel ovens, with their continuous and efficient baking characteristics, have become the core equipment for drying and shaping leather. Through the coordinated operation of a fan and heat source system, they achieve hot air circulation and heat transfer, allowing the leather to complete dehydration and shaping processes during transport. Currently, the heat source of traditional leather tunnel ovens is directly located at the top of the oven, with a fan-connected duct at the top driving the hot air circulation to achieve uniform baking of the leather.

[0003] However, with the expansion of leather goods production, large tunnel ovens have revealed significant shortcomings in practical applications. Due to the increased length and space of the oven, the larger the oven cavity, the worse the heating uniformity and the lower the heating effect. Traditional layouts cannot guarantee the uniform distribution of hot air during long-distance transportation, resulting in uneven heating of the leather surface, causing localized overheating or insufficient drying, which seriously affects product quality and yield. The increased length and space of the oven also lead to significant heat waste in tunnel ovens, significantly increasing production costs. Utility Model Content

[0004] The purpose of this invention is to provide a tunnel furnace that solves the technical problems of insufficient heating uniformity and high heat loss in existing tunnel furnaces.

[0005] To achieve the above objectives, this utility model provides a tunnel oven, comprising a shell with an internal cavity and a heating device for heating the cavity. A fan is provided above the shell, and the fan outlet is connected to the cavity in the shell. A conveying device for conveying parts to be baked is provided in the cavity inside the shell. An air duct is also provided in the shell, and a fan hole is provided on the air duct. The fan hole is connected to the fan outlet. An air pipe hole is also provided through the air duct. An air pipe is provided in the air duct, and the air pipe passes through the air pipe hole and intersects the air duct in the horizontal direction. The portion of the air pipe located in the air pipe hole has an air inlet, and the end of the air pipe adjacent to the conveying device has an air outlet.

[0006] Preferably, there are multiple heating devices, each installed in an air duct.

[0007] Preferably, the air duct is located at the middle position along the length of the air duct, and the air inlet is located at the middle position along the length of the air duct.

[0008] Preferably, the air duct is fixed to the top surface of the housing cavity.

[0009] Preferably, the air duct is square.

[0010] Preferably, the duct hole is sealed to the duct, and the air outlet of the fan is sealed to the fan hole.

[0011] Preferably, the air inlet is a plurality of circular holes evenly arranged around the circumference of the air duct.

[0012] Preferably, the exhaust port is a linear slit arranged along the duct.

[0013] Preferably, the exhaust vent is provided with multiple connecting blocks.

[0014] Preferably, the heating device can be a natural gas boiler. The heat generated by the heating device enters the air duct through the air channel under the action of the fan, and is discharged from the air duct to act on the workpiece to be baked.

[0015] The above-mentioned technical solutions in a tunnel furnace provided by this utility model embodiment have at least one of the following technical effects:

[0016] This utility model discloses a tunnel oven that connects to a fan via an air duct. An air duct is installed outside the heating device, and the heat in the air duct is evenly discharged through the exhaust port, thereby making the heat distribution on the workpiece to be baked more uniform, reducing heat waste, and enabling more accurate temperature control in different areas.

[0017] This utility model discloses a tunnel furnace that uses an air supply method in which air ducts are inserted into air channels. The replacement of the transmission tunnel furnace requires the installation of an air channel with the same width as the heating device above the entire heating device, which makes the air channel smaller, saves costs, facilitates transportation and assembly, and reduces the height of the equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A perspective view of a tunnel furnace provided for an embodiment of this utility model.

[0020] Figure 2 A partial view of a tunnel furnace provided for an embodiment of this utility model.

[0021] Figure 3 A perspective view of an air duct in a tunnel furnace provided for an embodiment of this utility model.

[0022] Figure 4 A perspective view of an air duct in a tunnel furnace provided for an embodiment of this utility model.

[0023] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0024] The following are the labeling elements in the figure:

[0025] 10—Casing; 20—Fan; 30—Air Duct; 31—Fan Hole; 32—Air Duct Hole; 40—Air Duct

[0026] 41—Air inlet 42—Air outlet 43—Connecting block 50—Heating device 60—Conveying device. Detailed Implementation

[0027] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0031] In one embodiment of this utility model, such as Figure 1 , 2 As shown, a tunnel furnace is provided, including a shell 10, a blower 20, an air duct 30, an air pipe 40, a heating device 50, and a conveying device 60.

[0032] The housing 10 provides a closed baking space for the entire equipment, forming an internal cavity that is insulated to reduce heat loss. A fan 20 is installed at the center of the top of the housing 10, with its outlet connected to the cavity, allowing airflow generated by the fan 20 to enter the housing 10. The air duct 30 is sealed at both ends and extends along the length of the housing 10, located in the middle of the top surface of the cavity. The air duct 30 is a square pipe, fixed to the top surface of the cavity by welding or bolting. An air pipe 40 is perpendicular to the air duct 30 and inserted into it, with the air duct 30 positioned in the middle of its length to ensure even distribution of airflow from the air duct 30 into the air pipe 40.

[0033] Within the cavity of the housing 10, multiple horizontally arranged heating devices 50 and conveying devices 60 are arranged vertically from top to bottom. The conveying device 60 adopts a high-temperature resistant and high-strength roller or chain plate structure, and its function is to carry the leather goods to be baked and move the leather goods to be baked along the length of the tunnel oven to ensure that the leather goods can be heated evenly during the baking process.

[0034] Multiple heating devices 50 are arranged in parallel above the conveying device 60, and the heating devices are located in the air duct 40. The heating device 50 is the core component for heat generation. It can use high-efficiency resistance wire, infrared heating tube or other suitable heating elements. It can output heat quickly and stably according to actual production needs. At the same time, according to actual production needs, the heating device 50 is equipped with a regulating valve to control the heat generated by the heating device 50, so as to adjust the heat generated by the heating device 50 in different air ducts 40, so that the leather goods to be baked receive different heat in different areas.

[0035] Specifically, the air duct 40 and the air channel 30 are arranged perpendicularly to each other in the horizontal direction, and the air duct 40 and the air channel 30 are connected. The length direction of the air channel 30 is consistent with the length direction of the heating device 50, and it is located at the middle position of the length direction of the heating device 50.

[0036] Specifically, such as Figure 3 As shown, multiple air duct holes 32 parallel to the heating devices 50 are opened through the air duct 30. The number of these holes corresponds one-to-one with the number of heating devices 50, and they are evenly distributed at equal intervals on the air duct 30. The inner diameter of each air duct hole 32 matches the outer diameter of the air duct 40, and a tight sealing connection is achieved through a high-temperature resistant sealing ring to prevent airflow in the air duct 30 from leaking from the connection.

[0037] like Figure 4 , 5 As shown, the air duct 40 adopts a circular tube structure. One end is sealed by welding, and the other end is provided with an exhaust port 42. The air duct 40 is precisely fitted outside the heating device 50 to ensure that the heating device 50 is located on the central axis of the air duct 40, so that the heat generated by the heating device 50 can be evenly diffused to the surroundings in an axisymmetric manner.

[0038] When the tunnel oven is put into operation, the blower 20 starts first, drawing in and pressurizing air from the external environment to form an airflow with a certain pressure and velocity. This airflow enters the air duct 30 located in the cavity of the housing 10 through the outlet of the blower 20. Since the air duct 30 is sealed at both ends, the airflow can only enter each air pipe 40. At the same time, the heating device 50 is turned on simultaneously, continuously releasing heat. This heat is quickly carried away by the airflow entering the air pipe 40, and undergoes sufficient heat exchange with the heating device 50, ensuring that the heat is evenly mixed inside the air pipe 40 and avoiding localized high or low temperature areas. Finally, the evenly mixed air is discharged from the air pipe 40 and directly acts on the surface of the workpiece to be baked moving on the conveyor device 60 below, thereby achieving all-round, uniform heating of the leather goods without dead angles, effectively improving baking quality and production efficiency.

[0039] The air duct 30 is provided with a fan hole 31, which is connected to the air outlet of the fan 20 through a sealed pipe. Simultaneously, the air duct 30 is also provided with multiple duct holes 32 parallel to the heating device 50. The diameter of the duct holes 32 is the same as the diameter of the duct 40, and the number of duct holes 32 corresponds to the number of heating devices 50, and they are evenly distributed on the air duct 30. The airflow generated by the fan 20 is diverted through each duct hole 32 into the corresponding duct 40.

[0040] The duct 40 is a circular tube structure, with an exhaust port 42 on its outer wall, extending along its length. The duct 40 passes through the duct hole 32 and is fitted onto the heating device 50, with the heating device 50 positioned at the center of the duct 40 to ensure even heat diffusion. Multiple air inlets 41 are provided in the portion of the duct 40 within the duct hole 32. These inlets 41 are evenly distributed around the circumference of the duct 40 and are all circular holes, allowing the airflow in the duct 30 to enter the duct 40 evenly and quickly. The design of multiple circular air inlets 41 on the duct 40 allows the airflow in the duct 30 to enter the duct 40 from multiple directions at a balanced velocity, facilitating sufficient heat exchange with the heating device 50 and ensuring uniform heat mixing within the duct 40, avoiding localized high or low temperature areas.

[0041] The exhaust vent 42 is a linear slit extending along the length of the duct 40, allowing airflow to be evenly discharged along the slit and covering the workpiece to be baked below. Simultaneously, the exhaust vent 42 is equipped with multiple connecting blocks 43, each consisting of two symmetrical, oppositely opening semi-circular arc structures. These blocks serve two purposes: firstly, they connect the exhaust vent 42, preventing deformation of the duct 40 during long-term use; secondly, they guide the discharged airflow, resulting in a more uniform airflow distribution. Furthermore, the symmetrical, oppositely opening semi-circular arc structures of the connecting blocks 43 strengthen the structural integrity between the connecting blocks 43 and the duct 40. The exhaust vent 42 ensures that the air, mixed with uniform heat, is discharged linearly and stably, directly acting on the surface of the workpiece to be baked moving on the conveyor device 60 below.

[0042] Furthermore, the structure of the round tube 40 can be directly formed by laser cutting, resulting in low processing cost and high forming efficiency.

[0043] In actual operation, after the fan 20 starts, it draws in outside air, pressurizes it, and sends it into the air duct 30. The air flows within the air duct 30 and enters the corresponding air duct 40 through the various air duct holes 32. At this time, the heating device 50 is turned on simultaneously, and the heat generated is quickly carried away and evenly mixed by the air entering the air duct 40. Since the air inlets 41 are evenly distributed in the middle of the air duct 40, air can enter the air duct 40 from multiple directions, making full contact with the heating device 50 and ensuring uniform heat distribution. Subsequently, the air mixed with heat is linearly and evenly discharged from the exhaust port 42, directly acting on the workpiece to be baked on the conveying device 60 below, achieving uniform heating of the workpiece.

[0044] In another embodiment of this utility model, the heating device 50 can be a natural gas boiler. The heating device 50 can be installed on the top of the housing 10 or other suitable location. The heating device 50 is connected to the air duct 30. The heat generated by the heating device 50 enters the air pipe 40 through the air duct 30 under the action of the fan 20, and is discharged from the air pipe 40 to act on the workpiece to be baked.

[0045] Furthermore, due to the design of the air duct 40 intersecting the air channel 30, compared to the traditional tunnel furnace which requires a large air channel of the same width above the entire heating device 50, the volume of the air channel 30 in this embodiment is significantly reduced. This not only lowers the manufacturing cost of the air channel 30 but also makes the equipment more convenient to transport and assemble. At the same time, the overall height of the equipment is reduced, occupying less space and making it suitable for more production site layouts.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tunnel oven, comprising a shell (10) with an internal cavity and a heating device (50) for heating the cavity inside the shell (10), wherein a fan (20) is provided above the shell (10), the air outlet of the fan (20) is connected through the cavity in the shell (10), and a conveying device (60) for conveying the workpiece to be baked is provided in the cavity inside the shell (10), characterized in that: The housing (10) is also provided with an air duct (30), the air duct (30) is provided with a fan hole (31), the fan hole (31) is connected to the air outlet of the fan (20), the air duct (30) is also provided with a duct hole (32); the air duct (30) is provided with a duct (40), the duct (40) passes through the duct hole (32) and is arranged to cross the air duct (30) in the horizontal direction; the part of the duct (40) located in the duct hole (32) is provided with an air inlet (41), and the end of the duct (40) adjacent to the conveying device (60) is provided with an exhaust port (42).

2. A tunnel furnace according to claim 1, characterized in that: There are multiple heating devices (50), each located in the air duct (40).

3. A tunnel furnace according to claim 1, characterized in that: The air duct (30) is located at the middle position along the length of the air pipe (40), and the air inlet (41) is located at the middle position along the length of the air pipe (40).

4. A tunnel furnace according to claim 1, characterized in that: The air duct (30) is fixed to the top surface of the cavity of the housing (10).

5. A tunnel furnace according to claim 1, characterized in that: The air duct (30) is square.

6. A tunnel furnace according to claim 1, characterized in that: The duct hole (32) is sealed to the duct (40), and the air outlet of the fan (20) is sealed to the fan hole (31).

7. A tunnel furnace according to claim 1, characterized in that: The air inlet (41) consists of multiple round holes evenly arranged around the circumference of the air duct (40).

8. A tunnel furnace according to claim 1, characterized in that: The exhaust port (42) is a linear slit set along the duct (40).

9. A tunnel furnace according to claim 1, characterized in that: The exhaust vent (42) is provided with multiple connecting blocks (43).

10. A tunnel furnace according to any one of claims 1-9, characterized in that: The heating device (50) can be a natural gas boiler. The heat generated by the heating device (50) enters the air duct (40) through the air duct (30) under the action of the fan (20), and is discharged from the air duct (40) to act on the workpiece to be baked.

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