Tunnel oven

Abstract

The utility model discloses a tunnel oven which comprises a machine frame and a conveying chain, a liftable heating cover is arranged on the machine frame, an upper centrifugal fan and an upper heating pipe are installed in the heating cover, a lower centrifugal fan is arranged below the upper centrifugal fan, a lower heating pipe is arranged above the lower centrifugal fan, and the lower heating pipe is arranged above the lower centrifugal fan. A first circulating air duct is assembled on the right side of the upper centrifugal fan, a second circulating air duct is assembled on the left side of the upper centrifugal fan, heat generated by the upper heating pipe and heat generated by the lower heating pipe are blown to the middle from the first circulating air duct and the second circulating air duct, and suction inlets are formed in the centers of the first circulating air duct and the second circulating air duct. Heat flows through the first circulating air duct, the second circulating air duct and the suction inlet to form continuous circulation, an HMI control panel is assembled on the left side of the machine frame, thyristors are adopted by the upper heating pipe and the lower heating pipe to serve as control driving devices, a traditional contactor is not used, and noise caused by frequent starting and stopping is completely eradicated.

Description

Technical Field

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

[0002] A tunnel oven is a continuous heating and drying equipment with a long, narrow tunnel inside. Materials passing through this tunnel can be heated, dried, or cured under preset temperature and time conditions. It operates with continuous feeding and discharging, maintaining a constant temperature and baking speed during the baking process. This not only improves production efficiency but also reduces waste of raw materials and human resources, thus enhancing economic benefits.

[0003] When a tunnel oven is controlled by a traditional contactor, the control circuit is relatively complex. Poor contact, pin oxidation, and contact wear can all generate noise. Continuous noise increases the psychological burden and tension on operators, negatively impacting their mental health. Utility Model Content

[0004] In view of the above-mentioned problems in the prior art, this application provides a tunnel oven.

[0005] The technical solution of this utility model is as follows:

[0006] A tunnel oven includes a frame and a conveyor chain. The frame is equipped with a liftable heating cover. An upper centrifugal fan and an upper heating pipe are installed inside the heating cover. A lower centrifugal fan is located below the upper centrifugal fan, and a lower heating pipe is located above the lower centrifugal fan. A first circulation duct is installed on the right side of the upper centrifugal fan, and a second circulation duct is installed on the left side of the upper centrifugal fan. The heat generated by the upper and lower heating pipes is blown towards the center through the first and second circulation ducts. An intake port is opened at the center of the first and second circulation ducts. The heat flows through the first and second circulation ducts and the intake port to form a continuous circulation. An HMI control panel is installed on the left side of the frame. Thyristors are used as control and drive devices for the upper and lower heating pipes.

[0007] In a preferred embodiment of this utility model, a protective cylinder is installed on the left side wall of the frame, and the protective cylinder is connected to the protective plate through a positioning plate.

[0008] In a preferred embodiment of this utility model: a drive reducer is installed at the bottom of the frame, the drive reducer is equipped with a drive sprocket, the drive sprocket is connected to a driven sprocket through a chain, the driven sprocket is installed on a transmission shaft, and the transmission shaft is connected to a transmission chain.

[0009] As a preferred embodiment of this utility model, exhaust pipes are provided on the left and right sides of the heating cover.

[0010] In a preferred embodiment of this utility model, the frame is provided with a panel, and the panel is equipped with an embedded handle.

[0011] As a preferred embodiment of this utility model: casters are installed at the bottom of the frame, and a photoelectric switch is installed at the left end of the frame.

[0012] The beneficial effects of this utility model are:

[0013] The rack is equipped with an HMI control panel, which has an intuitive user interface. Through the graphical user interface or touch screen, operators can easily access key information and perform control. Operators can intuitively understand the working status of the tunnel oven through the HMI control panel, quickly detect abnormalities and make adjustments. The upper and lower heating tubes use thyristors as control drive devices, ensuring reliable temperature control accuracy. This avoids the use of traditional contactors, eliminates noise during frequent start-stop operations, and protects the physical and mental health of operators. Attached Figure Description

[0014] Figure 1 This is a front view of a tunnel oven according to the present invention;

[0015] Figure 2 This is the left view of the present invention;

[0016] Figure 3 This is the right view of the present invention;

[0017] Figure 4 This is a top view of the present invention;

[0018] Figure 5 This is a perspective view of the present utility model;

[0019] Figure 6 This is a magnified view of point A.

[0020] In the diagram: 1-Frame; 2-Protective cylinder; 3-Upper centrifugal fan; 4-Lower heating element; 5-Drive reducer; 6-Lower centrifugal fan; 7-HMI control panel; 8-Upper heating element; 9-Exhaust pipe; 10-Panel; 11-Protective plate; 12-Positioning plate; 13-Photoelectric switch; 14-Heating cover; 15-Conveyor chain; 16-Suction inlet; 17-Embedded handle; 18-Foot cup; 19-Drive sprocket; 20-Chain; 21-Passive sprocket; 22-Drive shaft; 23-Circulating air duct one; 24-Circulating air duct two. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1-6 As shown, a tunnel oven includes a frame 1 and a conveyor chain 15. The frame 1 is equipped with a liftable heating cover 14. An upper centrifugal fan 3 and an upper heating pipe 8 are installed inside the heating cover 14. A lower centrifugal fan 6 is arranged below the upper centrifugal fan 3, and a lower heating pipe 4 is arranged above the lower centrifugal fan 6. A first circulation duct 23 is installed on the right side of the upper centrifugal fan 3, and a second circulation duct 24 is installed on the left side of the upper centrifugal fan 3. The heat generated by the upper heating pipe 8 and the lower heating pipe 4 is blown from the first circulation duct 23 and the second circulation duct 24 to the middle. An intake port 16 is opened at the center of the first circulation duct 23 and the second circulation duct 24. The heat flows through the first circulation duct 23, the second circulation duct 24 and the intake port 16 to form a continuous circulation. An HMI control panel 7 is installed on the left side of the frame 1. The upper heating pipe 8 and the lower heating pipe 4 use thyristors as control drive devices.

[0023] A protective cylinder 2 is installed on the left side wall of the frame 1. The protective cylinder 2 is connected to the protective plate 11 through the positioning plate 12. After the temperature reaches the set value, the protective cylinder 2 opens the protective plate 11 through the positioning plate 12. A drive reducer 5 is installed at the bottom of the frame 1. The drive reducer 5 is equipped with a drive sprocket 19. The drive sprocket 19 is connected to the driven sprocket 21 through the chain 20. The driven sprocket 21 is installed on the drive shaft 22. The drive shaft 22 is connected to the transmission chain 15. The chain drive has no elastic slippage and can maintain an accurate average transmission ratio, which improves the transmission efficiency. Smoke pipes 9 are provided on the left and right sides of the heating cover 14 to effectively prevent heat and oil fumes from the heating area from overflowing the tunnel and to discharge the oil fumes outdoors through the pipes. The frame 1 is provided with a panel 10. The panel 10 is equipped with an embedded handle 17, which reduces the potential risk of contact. Casters 18 are installed at the bottom of the frame 1 to move the position flexibly. A photoelectric switch 13 is installed at the left end of the frame 1. After the photoelectric switch 13 detects the product, the transmission chain 15 runs stably at the set speed.

[0024] Working process: After the tunnel oven is powered on, the heating temperature, conveying speed and baking time are set through the HMI control panel 7. After the temperature reaches the set value, the protective cylinder 2 opens the protective plate 11 through the positioning plate 12.

[0025] At this time, the tray can be placed into the tunnel oven from the entrance. When the photoelectric switch 13 installed at the entrance detects the product, the conveyor chain 15 runs stably at the set speed and enters the heating zone. The heat is blown from both sides of the heating zone to the middle by the lower centrifugal fan 6 and the upper centrifugal fan 3, and then forms a continuous cycle through the suction port 16 set in the central area.

[0026] The upper heating tube 8 and the lower heating tube 4 use thyristors as control drive devices, which can be continuously and variablely heated by the PLC according to the set temperature. Due to the use of thyristor heating technology, the temperature control accuracy is reliably guaranteed, and there is no noise from the frequent start and stop of traditional contactors.

[0027] During normal operation, the heating cover 14 is in a closed state when lowered, but it is always in the raised state shown in the attached diagrams of the instruction manual. When the tunnel oven is being cleaned or under maintenance, the cover 14 should be raised.

[0028] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, and for those of ordinary skill in the art, various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details.

Claims

1. A tunnel oven, characterized in that: Includes a frame (1) and a conveyor chain (15). The frame (1) is equipped with a liftable heating cover (14). An upper centrifugal fan (3) and an upper heating pipe (8) are installed inside the heating cover (14). A lower centrifugal fan (6) is installed below the upper centrifugal fan (3), and a lower heating pipe (4) is installed above the lower centrifugal fan (6). A first circulation duct (23) is installed on the right side of the upper centrifugal fan (3), and a second circulation duct (24) is installed on the left side of the upper centrifugal fan (3). The upper heating pipe (8) and the lower centrifugal fan (6) are connected to the upper centrifugal fan (15). The heat generated by the heating tube (4) is blown from the first circulation duct (23) and the second circulation duct (24) towards the middle. The first circulation duct (23) and the second circulation duct (24) are provided with an intake port (16) at the center. The heat flows through the first circulation duct (23), the second circulation duct (24) and the intake port (16) to form a continuous circulation. The left side of the frame (1) is equipped with an HMI control panel (7). The upper heating tube (8) and the lower heating tube (4) use thyristors as control drive devices.

2. The tunnel oven according to claim 1, characterized in that: A protective cylinder (2) is installed on the left side wall of the frame (1), and the protective cylinder (2) is connected to the protective plate (11) through the positioning plate (12).

3. The tunnel oven according to claim 1, characterized in that: The bottom of the frame (1) is equipped with a drive reducer (5), the drive reducer (5) is equipped with a drive sprocket (19), the drive sprocket (19) is connected to a passive sprocket (21) via a chain (20), the passive sprocket (21) is mounted on a drive shaft (22), and the drive shaft (22) is connected to a transmission chain (15).

4. The tunnel oven according to claim 1, characterized in that: The heating cover (14) is provided with exhaust pipes (9) on the left and right sides.

5. The tunnel oven according to claim 1, characterized in that: The frame (1) is provided with a panel (10), and the panel (10) is equipped with an embedded handle (17).

6. The tunnel oven according to any one of claims 1-5, characterized in that: The bottom end of the frame (1) is equipped with casters (18), and the left end of the frame (1) is equipped with a photoelectric switch (13).

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