A high temperature oxygen-free tunnel furnace

Abstract

The invention discloses a high-temperature oxygen-free tunnel furnace, comprising a furnace body and a furnace cover. By arranging negative pressure chamber devices on both sides of a heating section, the sealing of nitrogen in the furnace can be improved when a baked object enters and exits the heating section. The heating zone is controlled by a plurality of heating sections separately, which can ensure that the amount of oxygen in the heating section is always kept at a stable level, and the baking effect of the baked object will be more stable, with a higher yield and better quality. Nitrogen enters the inner cavity of the furnace body through a nitrogen channel on the side wall of the furnace body, which can further maintain the sealing of the furnace body and prevent nitrogen leakage. Furthermore, the inner cavity of the furnace body is composed of a plurality of cavities, which improves the sealing and ensures the stability of the temperature of the inner cavity of the furnace body.

Description

Technical Field

[0001] The invention relates to the technical field of baking equipment for electronic components, and in particular to a high-temperature oxygen-free tunnel furnace. Background Art

[0002] Some parts of electronic products need to be baked, and the oxygen content in the furnace needs to be controlled during the baking process. Some electronic products with very high precision require the oxygen content in the furnace to be controlled below 20,000 PPM during the baking process, which is very close to an oxygen-free environment. However, when the parts to be baked enter the existing oven, it is easy to bring oxygen from the outside space into the baking oven, thereby increasing the difficulty of controlling the oxygen content in the furnace and reducing the quality of the product after baking. The solution in the prior art is to fill a large amount of nitrogen into the furnace after feeding to dilute the oxygen content in the furnace, which will greatly consume nitrogen and increase production costs. Summary of the invention

[0003] In order to overcome the above-mentioned defects, the present invention provides a high-temperature oxygen-free tunnel furnace, which saves nitrogen consumption and is easier to control the oxygen content in the furnace.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a high-temperature oxygen-free tunnel furnace, including a furnace body and a furnace cover, the furnace body is fixed on a frame, a vertical lifting mechanism for lifting the furnace cover is provided at the upper end of the frame, a conveying track is provided inside the furnace body, the front and rear ends of the furnace body are respectively a feed port and a discharge port, and a sealed negative pressure chamber device is provided at the feed port and the discharge port, the furnace body is composed of a heating zone at the front and middle ends and a cooling zone at the rear end, the heating zone is divided into four uniform heating sections, each heating section is provided with a plurality of heating plates in two layers, water cooling devices are provided on the upper and lower sides of the cooling zone, the furnace body is sealed and filled with nitrogen, and the nitrogen enters the inner cavity of the furnace body through the nitrogen channel on the side wall of the furnace body.

[0005] As a further improvement of the present invention, the heating plate is heated by infrared radiation.

[0006] As a further improvement of the present invention, a nitrogen channel composed of two inner and outer sealing strips is provided above the side wall of the furnace body, and a through hole communicating with the nitrogen channel and the inner cavity of the furnace body is provided in the side wall.

[0007] As a further improvement of the present invention, a nitrogen blowing pipe is provided between the heating plates, and the nitrogen blowing pipe is connected to the nitrogen channel.

[0008] As a further improvement of the present invention, the furnace body is composed of three layers of cavities from the inside to the outside. The innermost layer is the working chamber, which is filled with nitrogen, and the products to be processed enter and exit from the feed port and the discharge port respectively; buffer chambers are arranged on both sides of the working chamber, which are also filled with nitrogen to control the temperature; the outermost layer is the insulation chamber.

[0009] As a further improvement of the present invention, adjustable adjustment plates are provided inside and outside the negative pressure chamber device.

[0010] The beneficial effects of the present invention are as follows: the high-temperature oxygen-free tunnel furnace of the present invention can improve the sealing of the nitrogen in the furnace when the baked items enter and exit the heating section by arranging negative pressure chamber devices on both sides of the heating section. The heating zone is controlled separately by multiple heating sections, which can ensure that the oxygen content in the heating section is always maintained at a stable level, and the baking effect of the baked items will be more stable, with a higher yield and better quality. Nitrogen enters the inner cavity of the furnace body through the nitrogen channel on the side wall of the furnace body, which can further maintain the sealing of the furnace body and prevent nitrogen leakage. Furthermore, the inner cavity of the furnace body is composed of multiple cavities, which improves the sealing while ensuring the stability of the temperature in the inner cavity of the furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is one of the structural schematic diagrams of the present invention;

[0012] Figure 2 This is the second schematic diagram of the structure of the present invention;

[0013] Figure 3 It is a longitudinal cross-sectional view of the structure of the present invention;

[0014] Figure 4 The structure of the present invention is perpendicular to Figure 1 Longitudinal section of

[0015] Figure 5 This is a schematic diagram of the nitrogen channel distribution arrangement of the structure of the present invention;

[0016] Indications in the figure: 1-furnace body; 2-furnace cover; 3-frame; 4-vertical lifting mechanism; 5-feed port; 6-discharge port; 7-negative pressure chamber device; 8-heating zone; 9-cooling zone; 10-heating plate; 11-nitrogen channel; 12-through hole; 13-nitrogen blowing pipe; 14-working chamber; 15-buffer chamber; 16-insulation chamber; 17-adjusting plate. DETAILED DESCRIPTION

[0017] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0018] Figure 1-5An embodiment of a high-temperature oxygen-free tunnel furnace of the present invention is shown, comprising a furnace body 1 and a furnace cover 2, wherein the furnace body is fixed on a frame 3, a vertical lifting mechanism 4 for lifting the furnace cover is provided at the upper end of the frame 3, a conveying track is provided inside the furnace body 1, a feed port 5 and a discharge port 6 are respectively provided at the front and rear ends of the furnace body 1, a sealed negative pressure chamber device 7 is provided at the feed port 5 and the discharge port 6, the furnace body 1 is composed of a heating zone 8 at the front and middle ends and a cooling zone 9 at the rear end, the heating zone 8 is divided into four uniform heating sections, each heating section is provided with a plurality of heating plates 10 in an upper and lower layer, each heating section is independently controlled to ensure uniform temperature in this area, water cooling devices are provided on the upper and lower sides of the cooling zone 9, the furnace body 8 is sealed and filled with nitrogen, and the nitrogen enters the inner cavity of the furnace body through the nitrogen channel 11 on the side wall of the furnace body.

[0019] The heating plate 10 is infrared radiation heating, and the heating method is changed from traditional aluminum plate and ceramic plate to infrared radiation heating, and the preheating time is short.

[0020] A nitrogen channel 11 composed of two inner and outer sealing strips is provided above the side wall of the furnace body 1 , and a through hole 12 communicating with the nitrogen channel and the inner cavity of the furnace body 1 is provided in the side wall.

[0021] A nitrogen blowing pipe 13 is provided between the heating plates 10 , and the nitrogen blowing pipe 13 is connected to the nitrogen channel 11 .

[0022] The furnace body 1 is composed of three layers of cavities from the inside to the outside. The innermost layer is the working chamber 14, which is filled with nitrogen. The materials to be processed and baked enter and exit from the feed port and the discharge port respectively; buffer chambers 15 are arranged on both sides of the working chamber 14, which are also filled with nitrogen to control the temperature; the outermost layer is the insulation chamber 16.

[0023] Adjustable adjustment plates 17 are arranged inside and outside the negative pressure chamber device 7 to prevent indoor air from entering the oven.

[0024] The working principle of the present invention is as follows: the baked object first enters the feed port 5 of the furnace body 1 through the conveyor belt, and then the nitrogen enters the through hole 12 of the furnace body 1 through the nitrogen channel 11 and enters the inner cavity of the furnace body, the negative pressure chamber device on both sides of the furnace body 1 is opened, and the width of the feed port is adjusted according to different baked objects through the adjustment plate 17 to prevent nitrogen leakage, and the baking machine enters the cooling zone 9 after baking in the heating zone 8, and is cooled by a water cooling device in the cooling zone 9 and then goes out through the discharge port. There are buffer chambers 15 on both sides of the inner cavity of the furnace body 1, and nitrogen is also filled into them through the nitrogen channel 11 to form an isolation with the inner cavity to ensure the stability of the working chamber 14 in the furnace body 1, and the external heat preservation chamber 16 ensures the temperature in the furnace body. The nitrogen in the furnace body will not leak at will through the tunnel furnace of the above structure, the nitrogen content is stable, less waste is less, and a good baking effect is always maintained.

[0025] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A high temperature oxygen-free tunnel furnace, characterized in that: The invention comprises a furnace body (1) and a furnace cover (2), wherein the furnace body is fixed on a frame (3), and a vertical lifting mechanism (4) for lifting the furnace cover is provided at the upper end of the frame (3); a conveying track is provided inside the furnace body (1); the front and rear ends of the furnace body (1) are respectively a feed port (5) and a discharge port (6); a sealed negative pressure chamber device (7) is provided at the feed port (5) and the discharge port (6); the furnace body (1) is composed of a heating zone (8) at the front and middle ends and a cooling zone (9) at the rear end; the heating zone (8) is divided into four uniform heating sections, and each heating section is provided with a plurality of upper and lower heating plates (10); the upper and lower layers of the cooling zone (9) are provided with a plurality of lower and upper heating plates (10); Water cooling devices are arranged on both sides. The furnace body (1) is sealed and filled with nitrogen. The nitrogen enters the inner cavity of the furnace body through a nitrogen channel (11) on the side wall of the furnace body. The furnace body (1) is composed of three layers of cavities from the inside to the outside. The innermost layer is a working cavity (14) filled with nitrogen. The products to be processed enter and exit from the feed port and the discharge port respectively. Buffer cavities (15) are arranged on both sides of the working cavity (14), which are also filled with nitrogen to control the temperature. The outermost layer is a heat preservation cavity (16). The upper side wall of the furnace body (1) is a nitrogen channel (11) composed of two inner and outer sealing strips, and a through hole (12) communicating with the nitrogen channel and the inner cavity of the furnace body (1) is arranged in the side wall.

2. A high temperature oxygen-free tunnel furnace according to claim 1, characterized in that: The heating plate (10) is heated by infrared radiation.

3. A high temperature oxygen-free tunnel furnace according to claim 1, characterized in that: A nitrogen blowing pipe (13) is provided between the heating plates (10), and the nitrogen blowing pipe (13) is connected to the nitrogen channel (11).

4. A high temperature oxygen-free tunnel furnace according to claim 1, characterized in that: Adjustable adjustment plates (17) are arranged inside and outside the negative pressure chamber device (7).

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