Infrared hot air tunnel furnace

Abstract

The utility model discloses an infrared hot air tunnel furnace, which comprises a furnace body, a heating device and an infrared heating device, the two conveying frames are arranged in the drying chamber in parallel, the process edges of the two opposite sides of the PCB are arranged on the two conveying frames and conveyed by the two conveying frames at the same time, and the two ends of the two conveying frames extend out of the furnace body respectively; the upper infrared heating device is mounted on the top wall in the drying chamber; and the lower infrared heating device is mounted on the bottom wall in the drying chamber. The two opposite sides of the process edge of the PCB are placed on the two conveying frames to be conveyed so that the PCB can horizontally pass through the position between the upper infrared heating device and the lower infrared heating device, heat radiation is generated on the upper surface and the lower surface of the PCB through the upper infrared heating device and the lower infrared heating device at the same time for drying, it is guaranteed that the two faces of the PCB are evenly dried, and the drying efficiency of the PCB is improved. And the quality stability of the PCB is ensured.

Description

Technical Field

[0001] This application relates to the field of furnace technology, specifically to an infrared hot air tunnel furnace, which mechanically moves the furnace charge within it. Background Technology

[0002] Utility model patent with publication number CN218595350U discloses a feeding device and a tunnel oven. The feeding device includes a frame, a conveying mechanism, a transferring mechanism, and a sprocket mechanism. The frame has a first position and a second position. The conveying mechanism is located on the frame and is used to receive horizontally arranged PCB boards and to transport the PCB boards to the first position. The transferring mechanism is located on the frame and is used to clamp the PCB board located at the first position and to drive the PCB board to flip and move to the second position. The PCB board located at the second position is vertically arranged. The sprocket mechanism is located on the frame and is connected to a board frame. The board frame is used to receive the PCB board located at the second position. The sprocket mechanism can drive the board frame to move so that the vertically arranged PCB board moves through the baking cavity.

[0003] Infrared tunnel ovens, with their high efficiency, energy saving, and environmental friendliness, have become important equipment on many production lines. When the aforementioned sprocket mechanism drives the board holder to move, it allows the vertically positioned PCB board to move through the baking cavity. When this sprocket mechanism is applied to an infrared tunnel oven, the working principle of the oven primarily utilizes the radiation characteristics of infrared rays for heating and drying, exhibiting a strong heating effect that can be rapidly absorbed by objects and converted into heat energy.

[0004] When vertically distributed PCBs pass through the baking cavity, the distance between the PCB and the infrared heater in the infrared tunnel oven differs too much, resulting in a large temperature difference during the drying process and affecting the final performance of the PCB. Summary of the Invention

[0005] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes an infrared hot air tunnel furnace, the technical solution of which includes:

[0006] An infrared hot air tunnel oven, comprising:

[0007] The furnace body has a drying chamber inside;

[0008] Two conveyor racks are arranged side by side in the drying chamber. The process edges of the PCB board on opposite sides are placed on the two conveyor racks and conveyed by them simultaneously. The two ends of the two conveyor racks extend out of the furnace body.

[0009] An infrared heating device is installed on the top wall of the drying chamber;

[0010] The lower infrared heating device is installed on the bottom wall of the drying chamber.

[0011] The technical solution adopted by one embodiment of this utility model to solve its technical problem is as follows: the conveyor frame includes a C-shaped guide rail and a plurality of conveyor wheels and a conveyor belt disposed in the guide rail. The guide rail is made of a light-transmitting material. The plurality of conveyor wheels are vertically and rotatably installed in the guide rail. The conveyor belt is wound around the plurality of conveyor wheels. The upper part of the conveyor belt and the upper end of the guide rail form a guide groove. The process edge is inserted into the guide groove.

[0012] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the inner wall of the drying chamber is provided with a first reflective layer.

[0013] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a pad layer is installed on the conveyor belt, and the pad layer is made of a flexible material that can be penetrated by infrared rays.

[0014] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a second reflective layer is provided on the lower end surface and the inner side of the pad layer.

[0015] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the pad layer is made of silicone material.

[0016] The technical solution adopted by one embodiment of this utility model to solve its technical problem is as follows: the furnace body includes a base and an upper cover. The upper cover is installed on the base through a lifting device and surrounds the base to form the drying chamber. The upper infrared heating device is installed on the upper cover, and the lower infrared heating device is installed on the base.

[0017] The beneficial effects of this utility model are as follows: The process edges of the PCB board are placed on two conveyor frames for conveying, so that the PCB board passes horizontally between the upper infrared heating device and the lower infrared heating device. The upper and lower infrared heating devices simultaneously generate heat radiation to dry the upper and lower surfaces of the PCB board, ensuring that the PCB board is dried evenly on both sides and ensuring the quality stability of the PCB board. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is an exploded view of the structure of the infrared hot air tunnel furnace described in the embodiments of this application;

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0023] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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.

[0024] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] Reference Figure 1-2 This application proposes an embodiment of an infrared hot air tunnel furnace, which includes:

[0026] Furnace body 10, with a drying chamber inside;

[0027] Two conveyor racks 20 are arranged side by side in the drying chamber. The process edges of the PCB board 40 on opposite sides are placed on the two conveyor racks 20 and conveyed by them simultaneously. The two ends of the two conveyor racks 20 extend out of the furnace body 10 respectively.

[0028] An infrared heating device 60 is installed on the top wall of the drying chamber;

[0029] The lower infrared heating device 70 is installed on the bottom wall of the drying chamber.

[0030] In this application, the process edges of the PCB board 40 are placed on two conveyor frames 20 for conveying, so that the PCB board 40 passes horizontally between the upper infrared heating device and the lower infrared heating device. The upper and lower infrared heating devices simultaneously generate heat radiation to dry the upper and lower surfaces of the PCB board 40, ensuring that the PCB board 40 is dried evenly on both sides and ensuring the quality stability of the PCB board 40.

[0031] Specifically, the conveyor frame 20 includes a C-shaped guide rail 21 and a plurality of conveyor wheels 22 and a conveyor belt 23 disposed within the guide rail 21. The guide rail 21 is made of a light-transmitting material. The plurality of conveyor wheels 22 are vertically and rotatably installed within the guide rail 21. The conveyor belt 23 is wound around the plurality of conveyor wheels 22. The upper part of the conveyor belt 23 and the upper end of the guide rail 21 form a guide groove 24. The process edge is inserted into the guide groove.

[0032] The conveyor wheel 22 is vertically and rotatably mounted inside the guide rail 21, and the process edge is placed on the upper part of the conveyor belt 23 and extends into the guide rail 21, so that the PCB board 40 is stably conveyed on the conveyor frame 20.

[0033] Since the guide rail 21 is made of a light-transmitting material, the infrared rays emitted by the upper and lower infrared heating devices can penetrate the guide rail 21 and irradiate the process edge and side surface of the PCB board 40, which helps to ensure that the PCB board 40 is dried evenly as a whole.

[0034] A drive motor is installed on the conveyor frame 20, and the drive motor is connected to one of the conveyor wheels 22 to drive the conveyor belt 23 to rotate on the multiple conveyor wheels 22.

[0035] Furthermore, the inner wall of the drying chamber is provided with a first reflective layer 30, which can be formed by curing a reflective coating applied in the drying chamber. The reflective coating can reflect infrared rays irradiated on the inner wall of the drying chamber, so that the reflected infrared rays can irradiate the PCB board 40 again, which is beneficial to improve the utilization rate of infrared rays and save energy.

[0036] Since the lower end face of the process edge of the PCB board 40 is placed on the conveyor belt 23, the conveyor belt 23 will block the process edge of the PCB board 40 from being radiated by infrared rays. Therefore, as a preferred option, a pad 25 can also be installed on the conveyor belt 23. The pad 25 is made of a flexible material and can be penetrated by infrared rays. A second reflective layer 26 is provided at the lower end of the pad 25 and on the side facing away from the inner wall of the drying chamber.

[0037] The pad 25 is made of silicone material, which can be penetrated by infrared rays. When infrared rays irradiate the pad 25, they can penetrate the silicone and reach the lower end face of the process edge of the PCB board 40. When the conveyor belt 23 rotates on the conveyor wheel 22, the silicone pad 25 can rotate synchronously with the conveyor belt 23.

[0038] Preferably, the lower end surface and inner side of the pad 25 are provided with a second reflective layer 26. When infrared rays penetrate the silicone and irradiate the lower end or inner side of the pad 25, some of the infrared rays can be reflected by the second reflective layer 26 and irradiate the lower end surface of the process edge of the PCB board 40.

[0039] The furnace body 10 includes a base 11 and an upper cover 12. The upper cover 12 is mounted on the base 11 via a lifting device 50 and forms the drying chamber therewith. The lifting device 50 includes multiple lifting rods. The upper infrared heating device 60 is mounted on the upper cover 12, and the lower infrared heating device 70 is mounted on the base 11. (Refer to the attached figure.) Figure 1 As shown, the lifting device 50 can lift the upper cover 12 to facilitate the inspection or maintenance of the conveyor frame inside the base 11 by the staff.

[0040] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. An infrared hot air tunnel oven, characterized in that, include: The furnace body (10) has a drying chamber inside; Two conveyor racks (20) are arranged side by side in the drying chamber. The process edges of the PCB board (40) on opposite sides are placed on the two conveyor racks (20) and conveyed by them simultaneously. The two ends of the two conveyor racks (20) extend out of the furnace body (10). An upper infrared heating device (60) is installed on the top wall of the drying chamber; The lower infrared heating device (70) is installed on the bottom wall of the drying chamber.

2. The infrared hot air tunnel oven according to claim 1, characterized in that, The conveyor frame (20) includes a C-shaped guide rail (21) and a plurality of conveyor wheels (22) and a conveyor belt (23) disposed in the guide rail (21). The guide rail (21) is made of a light-transmitting material. The plurality of conveyor wheels (22) are vertically and rotatably installed in the guide rail (21). The conveyor belt (23) is wound around the plurality of conveyor wheels (22). The upper part of the conveyor belt (23) and the upper end of the guide rail (21) form a guide groove (24). The process edge is inserted into the guide groove (24).

3. The infrared hot air tunnel oven according to claim 2, characterized in that, The inner wall of the drying chamber is provided with a first reflective layer (30).

4. The infrared hot air tunnel oven according to claim 2, characterized in that, A pad (25) is installed on the conveyor belt (23), the pad (25) being made of a flexible material that can be penetrated by infrared light.

5. The infrared hot air tunnel oven according to claim 4, characterized in that, The lower end face and inner side of the pad (25) are provided with a second reflective layer (26).

6. The infrared hot air tunnel oven according to claim 4, characterized in that, The pad (25) is made of silicone material.

7. The infrared hot air tunnel furnace according to claim 1, characterized in that, The furnace body (10) includes a base (11) and an upper cover (12). The upper cover (12) is installed on the base (11) by a lifting device (50) and surrounds it to form the drying chamber. The upper infrared heating device is installed on the upper cover (12), and the lower infrared heating device is installed on the base (11).

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