Preheating equipment for all-digital intermediate-frequency welding

Abstract

The preheating equipment comprises an equipment body and a control cabinet, the equipment body is connected with a net-shaped conveying belt penetrating through the whole equipment body, the inner bottom of the equipment body is connected with a gas uniformizing and distributing plate, and one side of the gas uniformizing and distributing plate is connected with a plurality of gas inlet pipes; the air inlet pipes are located in the outer side equipment body and connected with a medium-frequency heating coil shell, the multiple air inlet pipes extend out of the equipment body and are jointly connected with an air filtering box, and the top of the equipment body is connected with multiple circulating pipes. Compared with the prior art, the utility model has the advantages that the gas inlet pipe is heated through the intermediate frequency heating coil shell, so that the gas heating which is high in heating speed, high in heat efficiency and energy-saving and environment-friendly can be ensured, and then the internal uniform heating and drying can be further ensured through lower gas inlet, upper gas outlet and circulating filtration; and heating and drying operation with relatively low energy consumption can be ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of circuit board welding auxiliary equipment, specifically to a preheating device for fully digital medium frequency welding. Background Technology

[0002] Circuit boards are named as follows: ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, circuit board, PCB board, aluminum substrate, high frequency board, thick copper board, impedance board, PCB, ultra-thin circuit board, ultra-thin circuit board, printed circuit board, etc.

[0003] In the soldering process of circuit boards, preheating is often required. Preheating offers several advantages, including flux activation, prevention of solder spatter caused by excessive moisture, and reduction of thermal stress, thus ensuring soldering quality. Existing preheating equipment is mostly cabinet-type preheating and drying, which has low drying efficiency. Therefore, continuous drying is increasingly being adopted. However, continuous drying equipment is non-sealed, often leading to unstable internal temperatures and higher energy consumption. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a fully digital medium-frequency welding preheating device with stable temperature and low energy consumption, addressing the shortcomings mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a preheating device for fully digital medium-frequency welding, including a device body and a control cabinet. The device body is connected to a mesh conveyor belt that runs through the entire device body. A fully digital display screen is connected to the outside of the control cabinet. A gas equalization and distribution plate is connected to the bottom of the device body. Multiple gas guide pipes are connected to the top of the gas equalization and distribution plate. Multiple air inlet pipes are connected to one side of the gas equalization and distribution plate. The air inlet pipes are located on the outside of the device body and are connected to a medium-frequency heating coil shell.

[0006] Multiple air inlet pipes extend to the outside of the main body of the equipment and are connected to a first air collecting pipe. The end of the first air collecting pipe is connected to a first air outlet pipe. The end of the first air outlet pipe is connected to a first air pump. The first air pump is connected to a first air extraction pipe. The end of the first air extraction pipe is connected to a gas filter box.

[0007] The top of the main body of the device is connected to multiple circulation pipes, which are connected together to a second gas collecting pipe. The end of the second gas collecting pipe is connected to a second exhaust pipe, which is connected to a second exhaust pump. The second exhaust pump is connected to a second outlet pipe that communicates with a gas filter box.

[0008] Furthermore, the main body of the equipment is connected to supporting side plates on both sides of the mesh conveyor belt, which facilitates the stable transport of circuit boards by the mesh conveyor belt.

[0009] Furthermore, the air inlet pipe extends to the outside of the equipment body and is connected to a one-way valve to prevent gas backflow.

[0010] Furthermore, a first temperature and humidity sensor is connected to the second exhaust pipe, and a vent pipe is connected to the second exhaust pipe, with a vent valve connected to the vent pipe. When the gas temperature and humidity are high, a venting operation can be performed.

[0011] Furthermore, the top of the main body of the device is connected to multiple second temperature and humidity sensors, and the gas distribution plate is connected to multiple third temperature and humidity sensors, which facilitates internal multi-position temperature and humidity sensing operations.

[0012] Furthermore, the gas filter box is connected to a partition support plate, and multiple cloth filter cylinders are connected to the partition support plate near the second gas outlet pipe to prevent excessive dust from entering.

[0013] The advantages of this utility model compared with the prior art are as follows: This utility model heats the air inlet pipe by means of a medium frequency heating coil shell, thereby ensuring fast heating speed, high thermal efficiency, and energy-saving and environmentally friendly gas heating. Then, through bottom air intake, top air exhaust and circulation filtration, it can further ensure uniform internal heating and drying, and also ensure heating and drying operations with correspondingly low energy consumption. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the first structure of a preheating device for fully digital medium-frequency welding.

[0015] Figure 2 This is a schematic diagram of the second structure of a preheating device for fully digital medium-frequency welding.

[0016] Figure 3 This is a schematic diagram of the first side section of a preheating device for fully digital medium-frequency welding.

[0017] Figure 4 This is a schematic diagram of the second side section of a preheating device for fully digital medium-frequency welding.

[0018] Figure 5 This is a cross-sectional structural diagram of the gas filter box of a preheating device for fully digital medium-frequency welding.

[0019] As shown in the figure: 1. Main body of the equipment; 2. Mesh conveyor belt; 3. Gas equalization and distribution plate; 4. Air inlet pipe; 5. Supporting side plate; 6. Air guide pipe; 7. Medium frequency heating coil shell; 8. First gas collecting pipe; 9. One-way valve; 10. First suction pump; 11. First air outlet pipe; 12. First suction pipe; 13. Gas filter box; 14. Circulation pipe; 15. Second gas collecting pipe; 16. Second suction pipe; 17. Second suction pump; 18. Second air outlet pipe; 19. First temperature and humidity sensor; 20. Vent pipe; 21. Vent valve; 22. Second temperature and humidity sensor; 23. Third temperature and humidity sensor; 24. Control cabinet; 25. Fully digital display screen; 26. Separator support plate; 27. Cloth cover filter cartridge. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] Combined with appendix Figure 1-5 A fully digital medium-frequency welding preheating device includes a main body 1 and a control cabinet 24. The main body 1 is connected to a mesh conveyor belt 2 that runs through the entire main body 1. Support side plates 5 are connected to both sides of the mesh conveyor belt 2. A fully digital display screen 25 is connected to the outside of the control cabinet 24. A gas equalization and distribution plate 3 is connected to the bottom of the main body 1. Multiple second temperature and humidity sensors 22 are connected to the top of the main body 1. Multiple third temperature and humidity sensors 23 are connected inside the gas equalization and distribution plate 3. The temperature and humidity data inside the device can be viewed in real time through the fully digital display screen 25 and the multiple sensors inside. Multiple air guide pipes 6 are connected to the top of the gas equalization and distribution plate 3. Multiple air inlet pipes 4 are connected to one side of the gas equalization and distribution plate 3. A medium-frequency heating coil shell 7 is connected to the outside of the gas inlet pipes 4 inside the main body 1. The medium-frequency heating coil shell 7 is a medium-frequency heating induction coil, which works based on the principle of electromagnetic induction. When an alternating current flows through the coil, an alternating magnetic field is generated around the coil. This magnetic field acts on the metal workpiece placed within it, creating eddy currents inside. These eddy currents are converted into heat energy due to the resistance of the metal, thus rapidly heating the workpiece. The medium-frequency heating induction coil typically operates in the frequency range of 1kHz to 20kHz. This heating method has advantages such as fast heating speed, high thermal efficiency, and energy saving and environmental protection. Therefore, using a medium-frequency heating induction coil to heat the gas inside the intake pipe 4 ensures these advantages.

[0022] Multiple air inlet pipes 4 extend to the outside of the main body 1 and are connected to a first air collecting pipe 8. A one-way valve 9 is connected to the air inlet pipes 4 extending to the outside of the main body 1. A first air outlet pipe 11 is connected to the end of the first air outlet pipe 11. A first suction pump 10 is connected to the end of the first suction pump 10. A first suction pipe 12 is connected to the end of the first suction pipe 12. A gas filter box 13 is connected to the end of the first suction pipe 12. That is, filtered gas is drawn from the outside. The gas is heated by the shell 7 of the medium frequency heating coil of the air inlet pipe 4 and then enters the gas equalization and distribution plate 3. Then, the gas is blown evenly upward from bottom to top through multiple air guide pipes 6, so as to perform hot air preheating and drying operation on the circuit board.

[0023] The top of the main body 1 of the device is connected to multiple circulation pipes 14, which are collectively connected to a second gas collecting pipe 15. A second extraction pipe 16 is connected to the end of the second gas collecting pipe 15, and a second extraction pump 17 is connected to the second extraction pipe 16. The second extraction pump 17 is connected to a second outlet pipe 18 that communicates with a gas filter box 13. By blowing air into the device from the bottom and then extracting air from the top, a uniform hot air circulation from bottom to top is ensured, thus guaranteeing uniform internal heating. The circulating hot air then re-enters the gas filter box 13, ensuring the reuse of hot air and further saving energy. The gas filter box 13 is connected to... A partition support plate 26 is provided, and multiple cloth filter cartridges 27 are connected to the partition support plate 26 near the second air outlet pipe 18. The cloth filter cartridges 27 need to be made of high-temperature resistant fabric, such as fluoropolymer, polyphenylene sulfide, P84, glass fiber and polytetrafluoroethylene as the main materials. It can filter dust and is also resistant to high temperatures. A first temperature and humidity sensor 19 is connected to the second air outlet pipe 18, and a vent pipe 20 is connected to the second air outlet pipe 18. A vent valve 21 is connected to the vent pipe 20. When the first temperature and humidity sensor 19 senses that the temperature and humidity are too high, the vent valve 21 can be opened to release a certain amount of moisture and heat, thereby reducing humidity and temperature.

[0024] In actual use, during the heating stage, multiple or all of the medium-frequency heating coil housings 7 can be opened simultaneously to ensure rapid temperature rise. Once the internal temperature stabilizes, due to the hot air circulation, several medium-frequency heating coil housings 7 can be closed accordingly. When actually closing them, try to open the medium-frequency heating coil housings 7 in an alternating manner, that is, open one every other one or two, to ensure a stable and uniform internal air intake temperature.

[0025] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A preheating device for fully digital medium-frequency welding, comprising a main body (1) and a control cabinet (24), wherein the main body (1) is connected to a mesh conveyor belt (2) that runs through the entire main body (1), characterized in that: The control cabinet (24) is connected to a fully digital display screen (25) on the outside. The bottom of the equipment body (1) is connected to a gas equalization and distribution plate (3). The top of the gas equalization and distribution plate (3) is connected to multiple air guide pipes (6). The side of the gas equalization and distribution plate (3) is connected to multiple air inlet pipes (4). The air inlet pipes (4) are located inside the outer equipment body (1) and connected to a medium frequency heating coil shell (7). Multiple air inlet pipes (4) extend to the outside of the main body (1) of the equipment and are connected to a first air collection pipe (8). The first air collection pipe (8) is connected to a first air outlet pipe (11) at its end. The first air outlet pipe (11) is connected to a first suction pump (10) at its end. The first suction pump (10) is connected to a first suction pipe (12). The first suction pipe (12) is connected to a gas filter box (13) at its end. The top of the main body (1) of the device is connected to multiple circulation pipes (14), and the multiple circulation pipes (14) are connected to a second gas collection pipe (15). The end of the second gas collection pipe (15) is connected to a second exhaust pipe (16), the second exhaust pipe (16) is connected to a second exhaust pump (17), and the second exhaust pump (17) is connected to a second exhaust pipe (18) that communicates with the gas filter box (13).

2. The preheating equipment for fully digital medium-frequency welding according to claim 1, characterized in that: The main body of the equipment (1) is connected to the support side plates (5) on both sides of the mesh conveyor belt (2).

3. The preheating equipment for fully digital medium-frequency welding according to claim 1, characterized in that: The air inlet pipe (4) extends to the outside of the main body (1) of the equipment and is connected to a one-way valve (9).

4. The preheating equipment for fully digital medium-frequency welding according to claim 1, characterized in that: A first temperature and humidity sensor (19) is connected to the second vent pipe (18), a vent pipe (20) is connected to the second vent pipe (18), and a vent valve (21) is connected to the vent pipe (20).

5. The preheating equipment for fully digital medium-frequency welding according to claim 1, characterized in that: Multiple second temperature and humidity sensors (22) are connected to the top of the main body (1) of the device, and multiple third temperature and humidity sensors (23) are connected to the gas equalization and distribution plate (3).

6. The preheating equipment for fully digital medium-frequency welding according to claim 1, characterized in that: The gas filter box (13) is connected to a partition support plate (26), and the partition support plate (26) is connected to a plurality of cloth filter cylinders (27) on the side near the second gas outlet pipe (18).

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