A tunnel-type hot air circulating oven

Abstract

This utility model discloses a tunnel-type hot air circulating oven, including an outer shell and a drying section. The drying section is located inside the outer shell and has a first conveyor belt inside the outer shell. A second conveyor belt is located at the end of the outer shell away from the first conveyor belt, and the height of the second conveyor belt is lower than that of the first conveyor belt. A rotating shaft is laterally rotatable inside the outer shell, and a tipping hopper is located on the side of the rotating shaft. The rotating shaft is at the same height as the first conveyor belt. This utility model, by incorporating the drying section, utilizes the first conveyor belt to transport materials. When the material is transported to the same position as the rotating shaft, the rotating shaft rotates, causing the tipping hopper to shift. The tipping hopper then receives the material from the first conveyor belt and flips it onto the lower second conveyor belt, realizing the transfer of material between conveyor belts of different heights. Furthermore, the material's flipping during transfer changes its contact surface with the conveyor belts, thereby improving the drying effect.

Description

Technical Field

[0001] This utility model relates to the field of circulating oven technology, specifically a tunnel-type hot air circulating oven. Background Technology

[0002] The tunnel-type hot air circulating oven is an industrial drying equipment mainly used for large-scale, continuous drying operations, and is widely used in industries such as food, chemicals, pharmaceuticals, electronics, and building materials. Its core feature is its tunnel-type structure, where materials continuously enter and exit via a conveyor belt. Combined with a hot air circulation system, it achieves efficient and uniform drying. During operation, materials enter the oven from one end via a conveyor belt and exit from the other. Hot air is generated by internal electric heating elements and circulated by a fan, ensuring even flow of hot air within the oven to achieve the desired drying effect.

[0003] In existing tunnel-type hot air circulating ovens, materials are typically placed directly on the conveyor belt during transport, and their position remains relatively fixed. Due to the presence of the conveyor belt, the side of the material in contact with the belt is exposed to hot air far less frequently than other surfaces exposed to air. This results in uneven drying, requiring longer drying times and reducing drying efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a tunnel-type hot air circulating oven to solve the problems mentioned in the background section of existing tunnel-type hot air circulating ovens. During material conveying, the material is typically placed directly on the conveyor belt, and its position remains relatively fixed. Due to the presence of the conveyor belt, the side of the material in contact with the conveyor belt is exposed to hot air far less frequently than other surfaces exposed to air, resulting in uneven drying, requiring longer drying times, and reducing drying efficiency.

[0005] To solve the above problems, this utility model provides the following technical solution: a tunnel-type hot air circulating oven, comprising an outer shell and a hot drying section:

[0006] The heating section is located inside the outer casing. The heating section has a first conveyor belt located inside the outer casing. A second conveyor belt is located at the end of the outer casing away from the first conveyor belt. The height of the second conveyor belt is lower than that of the first conveyor belt. A rotating shaft is laterally rotatable inside the outer casing. A tipping hopper is located on the side of the rotating shaft. The rotating shaft is at the same height as the first conveyor belt. The rotation of the rotating shaft drives the tipping hopper to move so as to flip the material on the first conveyor belt onto the second conveyor belt.

[0007] By adopting the above technical solution, the first conveyor belt can be used to transport materials. When the materials are transported to the same position as the rotating shaft, the rotating shaft rotates and drives the tipping hopper to move, so that the tipping hopper receives the materials on the first conveyor belt and flips them onto the second conveyor belt at a lower position, realizing the transfer of materials between conveyor belts of different heights, and allowing the materials to flip and change the contact surface with the conveyor belt during the transfer, thereby improving the drying effect of the materials.

[0008] Preferably, the heating section also has electric heating tubes disposed on both sides of the outer casing, and a circulating fan is disposed on the top of the outer casing.

[0009] By adopting the above technical solution, the hot air inside the oven can be circulated, allowing the heat to be distributed more evenly inside the oven.

[0010] Preferably, the hot drying section also has a first motor disposed on the side of the outer casing, the output end of the first motor being connected to a first conveyor belt, and a transmission belt being disposed on the side of the first conveyor belt, the transmission belt being connected to the side of a second conveyor belt.

[0011] By adopting the above technical solution, the first motor can provide power to the first conveyor belt, enabling it to operate normally and transport materials. Furthermore, the first conveyor belt is connected to the second conveyor belt via a transmission belt, so that when the first conveyor belt is running, it can drive the second conveyor belt to run synchronously, thus realizing the ability to drive two conveyor belts with only one first motor.

[0012] Preferably, there are four tipping hoppers, and the four tipping hoppers are arranged in a central rotational symmetry structure around the rotation center of the rotating shaft.

[0013] By adopting the above technical solution, the four tipping hoppers can work in sequence during the rotation of the shaft, continuously turning the material on the first conveyor belt onto the second conveyor belt.

[0014] Preferably, the heating section also has a second motor disposed on the side of the outer casing, the output end of which is connected to the rotating shaft.

[0015] By adopting the above technical solution, a second motor can be used to provide power to the rotating shaft, enabling it to rotate at a set speed and direction.

[0016] Preferably, the hot drying section also has a guide frame disposed inside the housing, the guide frame being located at the output end of the first conveyor belt and directly above the second conveyor belt.

[0017] By adopting the above technical solution, the guide frame plays a role in guiding and restraining the material during the process of the tipping hopper turning the material from the first conveyor belt to the second conveyor belt. It can ensure that the material falls accurately onto the second conveyor belt, avoid the material from scattering or deviating from the conveying path, and ensure the accuracy and stability of material conveying.

[0018] Preferably, the side of the guide frame is provided with a curved concave arc surface, and the outer edge of the tipping hopper abuts against the arc surface of the guide frame.

[0019] By adopting the above technical solution, the outer edge of the tipping hopper can slide along the curved concave arc surface of the guide frame during rotation. This design further improves the stability and accuracy of the tipping hopper in tipping materials, while also preventing materials from leaking out from the gap between the tipping hopper and the guide frame during tipping.

[0020] Compared with the prior art, the beneficial effects of this utility model are: by setting up a hot drying section, the material can be transported by the first conveyor belt. When the material is transported to the same position as the rotating shaft, the rotating shaft rotates and drives the tipping hopper to move, so that the tipping hopper receives the material on the first conveyor belt and flips it to the second conveyor belt at a lower position, realizing the transfer of material between conveyor belts of different heights, and allowing the material to flip and change the contact surface with the conveyor belt during the transfer, thereby improving the drying effect of the material. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this application;

[0022] Figure 2 This is a schematic diagram of the overall internal structure of this application;

[0023] Figure 3 This is a schematic diagram of the overall internal structure of this application;

[0024] Figure 4 This is a schematic diagram of the connection structure between the rotating shaft and the tipping hopper in this application.

[0025] In the diagram: 1. Outer shell; 2. Heating section; 201. First conveyor belt; 202. First motor; 203. Second conveyor belt; 204. Transmission belt; 205. Circulating fan; 206. Guide frame; 207. Rotating shaft; 208. Tilting hopper; 209. Electric heating tube; 210. Second motor. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1

[0028] Please see Figure 1 , Figure 2 and Figure 3 This embodiment provides a technical solution: a tunnel-type hot air circulating oven, including an outer shell 1 and a hot drying section 2.

[0029] The heating section 2 is located inside the outer casing 1. The heating section 2 has a first conveyor belt 201 located inside the outer casing 1. A second conveyor belt 203 is located at the end of the outer casing 1 away from the first conveyor belt 201. The height of the second conveyor belt 203 is lower than that of the first conveyor belt 201. A rotating shaft 207 is laterally rotatably arranged inside the outer casing 1. A tipping hopper 208 is located on the side of the rotating shaft 207. The rotating shaft 207 is at the same height as the first conveyor belt 201. The rotation of the rotating shaft 207 causes the tipping hopper 208 to move. The material on the first conveyor belt 201 can be transferred to the second conveyor belt 203. The first conveyor belt 201 can be used to transport the material. When the material is transported to the same position as the rotating shaft 207, the rotating shaft 207 rotates and drives the tilting hopper 208 to move. The tilting hopper 208 receives the material on the first conveyor belt 201 and flips it to the lower position of the second conveyor belt 203, realizing the transfer of material between conveyor belts of different heights. The material is also flipped during the transfer, changing the contact surface with the conveyor belt, thereby improving the drying effect of the material.

[0030] Example 2

[0031] Please see Figure 2 , Figure 3 and Figure 4 This embodiment provides a technical solution: a tunnel-type hot air circulating oven, including an outer shell 1 and a hot drying section 2.

[0032] Heating tubes 209 are provided on both sides of the outer shell 1, and a circulating fan 205 is provided on the top of the outer shell 1, which can circulate the hot air inside the oven and make the heat more evenly distributed inside the oven.

[0033] A first motor 202 is installed on the side of the outer casing 1. The output end of the first motor 202 is connected to the first conveyor belt 201. A transmission belt 204 is installed on the side of the first conveyor belt 201, and the transmission belt 204 is connected to the side of the second conveyor belt 203. The first motor 202 is specifically a servo motor, which is a high-precision, high-performance motor capable of precisely controlling position, speed, and acceleration. Its working principle is based on a closed-loop control system, mainly composed of a motor, encoder, sensor, and controller. The above is existing technology and will not be elaborated further. When selecting a model, its power should be selected to suit the needs of the device to ensure that the object to be driven is driven. The first motor 202 can provide power to the first conveyor belt 201, enabling it to operate normally and transport materials. Furthermore, the first conveyor belt 201 is connected to the second conveyor belt 203 through the transmission belt 204. When the first conveyor belt 201 is running, it can drive the second conveyor belt 203 to run synchronously, realizing that only one first motor 202 can drive two conveyor belts to work.

[0034] There are four tipping hoppers 208. The four tipping hoppers 208 are arranged in a central rotational symmetry structure around the rotation center of the rotating shaft 207. During the rotation of the rotating shaft 207, the four tipping hoppers 208 work in sequence and continuously tip the material on the first conveyor belt 201 onto the second conveyor belt 203.

[0035] The heating unit 2 also has a second motor 210 located on the side of the outer casing 1. The output end of the second motor 210 is connected to the rotating shaft 207. Specifically, the second motor 210 is a servo motor, which is a high-precision, high-performance motor capable of precisely controlling position, speed, and acceleration. Its working principle is based on a closed-loop control system, mainly composed of a motor, encoder, sensor, and controller. The above is existing technology and will not be elaborated further below. When selecting a model, its power should be selected to suit the needs of the device to ensure that the object to be driven is driven. The second motor 210 can be used to provide power to the rotating shaft 207, enabling it to rotate at a set speed and direction.

[0036] A guide frame 206 is installed inside the outer casing 1. The guide frame 206 is located at the output end of the first conveyor belt 201 and directly above the second conveyor belt 203. During the process of material being turned from the first conveyor belt 201 to the second conveyor belt 203 by the tipping hopper 208, the guide frame 206 guides and restrains the material. It ensures that the material falls accurately onto the second conveyor belt 203, preventing the material from scattering or deviating from the conveying path, and ensuring the accuracy and stability of material conveying.

[0037] The guide frame 206 has a curved concave arc surface on its side. The outer edge of the tipping hopper 208 abuts against the arc surface of the guide frame 206, allowing its outer edge to slide along the curved concave arc surface of the guide frame 206 during the rotation of the tipping hopper 208. This design further improves the stability and accuracy of the tipping hopper 208 in tipping materials, while also preventing material from leaking out from the gap between the tipping hopper 208 and the guide frame 206 during the tipping process.

[0038] Working Principle: First, the first motor 202, the second motor 210, and the circulating fan 205 are started, and the heating element 209 is turned on. The first motor 202 drives the first conveyor belt 201 to operate. Since the first conveyor belt 201 is connected to the second conveyor belt 203 through the transmission belt 204, the second conveyor belt 203 also operates synchronously. The heating element 209 begins to heat up, providing the heat energy required for drying inside the oven. The circulating fan 205 circulates the hot air inside the oven, allowing the heat to be evenly distributed inside the oven. The material to be dried is placed on the first conveyor belt 201, which conveys the material forward. When the material is conveyed to the same position as the rotating shaft 207, the second motor 210 drives the rotating shaft 207 to rotate. The rotating shaft 207 drives the four centrally rotating symmetrical tilting hoppers 208 to rotate sequentially. The tilting hoppers 208 receive the material on the first conveyor belt 201 and turn the material over during rotation. On the lower-positioned second conveyor belt 203, the guide frame 206 plays a crucial role during the material turning process in the tipping hopper 208. Located at the output end of the first conveyor belt 201 and directly above the second conveyor belt 203, the guide frame 206's curved concave surface abuts against the outer edge of the tipping hopper 208. The guide frame 206 guides and constrains the material, ensuring it falls accurately onto the second conveyor belt 203, preventing it from scattering or deviating from the conveying path. This design also prevents material leakage from the gap between the tipping hopper 208 and the guide frame 206, ensuring effective material transfer. As the material moves from the first conveyor belt 201 to the second conveyor belt 203, the contact surface with the conveyor belt changes, increasing the contact area between the material and hot air and the residence time in the oven, thereby improving the drying effect. Finally, the material continues to be conveyed forward with the second conveyor belt 203 until the entire drying process is completed and the material is output from the oven.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tunnel-type hot air circulating oven, characterized in that, include: Outer shell (1); The drying section (2) is located inside the outer shell (1). The drying section (2) has a first conveyor belt (201) located inside the outer shell (1). A second conveyor belt (203) is located at one end of the outer shell (1) away from the first conveyor belt (201). The height of the second conveyor belt (203) is lower than that of the first conveyor belt (201). A rotating shaft (207) is located inside the outer shell (1) and rotates laterally. A hopper (208) is located on the side of the rotating shaft (207). The rotating shaft (207) is at the same height as the first conveyor belt (201). The rotating shaft (207) rotates and drives the hopper (208) to move so as to turn the material on the first conveyor belt (201) onto the second conveyor belt (203).

2. The tunnel-type hot air circulating oven according to claim 1, characterized in that: The heating section (2) also has electric heating tubes (209) arranged on both sides of the outer casing (1), and a circulating fan (205) is arranged on the top of the outer casing (1).

3. The tunnel-type hot air circulating oven according to claim 1, characterized in that: The hot drying section (2) also has a first motor (202) disposed on the side of the outer casing (1), the output end of the first motor (202) being connected to the first conveyor belt (201), and a transmission belt (204) being disposed on the side of the first conveyor belt (201), which is connected to the side of the second conveyor belt (203).

4. The tunnel-type hot air circulating oven according to claim 1, characterized in that: There are four tipping hoppers (208), and the four tipping hoppers (208) are arranged in a central rotational symmetry structure around the rotation center of the rotating shaft (207).

5. A tunnel-type hot air circulating oven according to claim 1, characterized in that: The heating section (2) also has a second motor (210) disposed on the side of the housing (1), the output end of which is connected to the rotating shaft (207).

6. A tunnel-type hot air circulating oven according to claim 1, characterized in that: The heating section (2) also has a guide frame (206) disposed inside the housing (1), the guide frame (206) being located at the output end of the first conveyor belt (201) and directly above the second conveyor belt (203).

7. A tunnel-type hot air circulating oven according to claim 6, characterized in that: The guide frame (206) has a curved concave arc surface on its side, and the outer edge of the tipping hopper (208) abuts against the arc surface of the guide frame (206).

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