A new energy automobile PCB etching device

Abstract

The utility model discloses a new energy automobile PCB circuit board etching device, the utility model relates to circuit board etching technical field. Including the mounting base is provided with the processing mechanism of new energy automobile PCB circuit board etching on the mounting base, and processing mechanism includes: etching subassembly, the utility model through the cooperation of screw component and lifting assembly, can conveniently with PCB circuit board from etching shell transfer to the cleaning shell, again transfer to the support plate of heating assembly, and in each position can through the height of accurate adjustment PCB circuit board of first electric push rod, make it stable and place on the support frame, whole transfer and fixed process operation simple, reduced manual intervention, reduced the risk of operation failure, the hot gas of heating assembly in hot gas generation main part generates and blows even in PCB circuit board surface through the pipe and nozzle, can evaporate the residual moisture quickly, realizes the efficient drying of PCB circuit board, improves production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of circuit board etching technology, specifically to an etching device for PCB circuit boards of new energy vehicles. Background Technology

[0002] A PCB (Printed Circuit Board) is an important electronic component, serving as the support for electronic components and the carrier for their electrical interconnections. Because it is manufactured using electronic printing techniques, it is called a "printed" circuit board. During PCB manufacturing, etching is often used to process the circuit diagrams on the board.

[0003] Reference patent (publication number: CN217825570U; publication date: 2022-11-15) discloses a PCB circuit board etching device, including a base and an etching device. The etching device is mounted on the base and includes a movable positioning structure, a cleaning structure, and a stirring assembly. The movable positioning structure includes a mounting frame, an electric linear guide rail, a mounting block, a telescopic cylinder, a mounting plate, a pair of linear drivers, and a pair of clamping plates. The movable positioning structure, through the cooperation of its components, can clamp and position the PCB board, enabling rapid movement and transportation of the PCB board without the need for manual handling of PCB boards with etching residue, thus avoiding injury to operators. The stirring assembly, through the cooperation of its components, can stir the etching solution in the etching tank, preventing etching solution sedimentation, which would reduce the etching effect and affect the etching quality.

[0004] Based on the aforementioned patents, the PCB board placement platform has a single function, serving only as a temporary placement point for the cleaned PCB board. It lacks drying treatment for the PCB board, and residual moisture may affect subsequent processes. During the PCB board etching process, it needs to be stably fixed to ensure the etching accuracy and quality. However, in existing etching devices, the clamping brackets used to fix the PCB board are usually installed in a relatively fixed manner, lacking flexibility. Moreover, after etching, a large amount of etching liquid and impurities remain on the surface of the PCB board. If not cleaned thoroughly in time, it will seriously affect the performance of the board. Most existing cleaning devices adopt a simple rinsing method, and the cleaning liquid circulation is insufficient, making it difficult to thoroughly rinse the PCB board. Therefore, this utility model provides a PCB board etching device for new energy vehicles. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a PCB circuit board etching device for new energy vehicles. It solves the problem that the PCB board placement platform has a single function, serving only as a temporary placement point for cleaned PCB boards and lacking drying treatment. Residual moisture may affect subsequent processes. During the PCB circuit board etching process, it needs to be securely fixed to ensure etching accuracy and quality. However, in existing etching devices, the clamping brackets used to fix the PCB circuit boards are usually installed in a relatively fixed manner, lacking flexibility. Furthermore, after etching, a large amount of etching solution and impurities remain on the surface of the PCB circuit board. If not cleaned thoroughly in time, this will seriously affect the performance of the circuit board. Most existing cleaning devices use simple rinsing methods, resulting in insufficient circulation of the cleaning solution and difficulty in thoroughly rinsing the PCB circuit board.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a PCB circuit board etching device for new energy vehicles, comprising a mounting base, wherein a processing mechanism for etching PCB circuit boards for new energy vehicles is disposed on the mounting base, and the processing mechanism includes: An etching assembly includes a support rod fixed at four ends to the upper surface of a mounting base. A fixing plate is fixed to the top of the support rod. A slide rail bracket is fixed to the inner wall of the fixing plate. A slide rod bracket connected by a threaded assembly is provided inside the slide rail bracket. A drive body is fixed to the lower end of the slide rod bracket. A mounting bracket is fixed to the lower end of the drive body. A mounting plate connected by a lifting assembly is provided to the lower end of the mounting bracket. A clamping bracket connected by a detachable assembly is provided inside the mounting plate. An etching shell is provided on the upper surface of the mounting base. A stirring assembly for mixing etching solution is provided inside the etching shell. The cleaning assembly includes a cleaning housing on the right side of the etched housing, a second stirring plate connected to the cleaning housing via a drive assembly, brushes evenly distributed on the upper surface of the second stirring plate, and a heating assembly for drying on the right side of the cleaning housing.

[0007] Preferably, the threaded assembly includes a screw rotatably connected inside the slide rail bracket, guide rods are fixed at both ends of the inner wall of the fixing plate, a slide rod bracket is slidably connected to the outer wall of the guide rod, the slide rod bracket is threadedly connected to the screw, and a limit block is fixed at the upper end of the slide rail bracket.

[0008] Preferably, the lifting assembly includes a first electric push rod fixedly through the interior of the mounting bracket, and a mounting plate fixedly connected to the lower end of the first electric push rod. The detachable assembly includes vertical plates fixed to both ends of the lower end face of the mounting plate, a second electric push rod fixed to the inner wall of the vertical plate, a mounting block fixed to the telescopic end of the second electric push rod, a pair of slots through the interior of the mounting block, a clamping bracket fixedly connected to one end of the clamping block, and bolts connecting the clamping block to the mounting block on the side wall of the mounting block.

[0009] Preferably, the stirring assembly includes a first drive shaft rotatably connected to the bottom of the etched housing, a first stirring plate fixed to the outer wall of the first drive shaft, and a side flap fixed to the end of the first stirring plate.

[0010] Preferably, the drive assembly includes a second drive shaft rotatably connected to the bottom of the inner side of the cleaning housing, a second stirring plate fixedly connected to the upper end of the second drive shaft, and a flipping plate fixed to the end of the second stirring plate.

[0011] Preferably, the heating assembly includes a support plate located on the right side of the cleaning housing on the upper surface of the mounting base, a support frame for supporting the circuit board fixed on the inner wall of the support plate, a conduit fixed at the upper end of the support plate, nozzles evenly distributed on the side of the conduit near the support frame, a hot air generating body provided at the input end of the conduit, and the hot air generating body is mounted on the mounting base.

[0012] Beneficial effects This invention provides an etching device for PCB circuit boards in new energy vehicles. Compared with the prior art, it has the following advantages: Firstly, this utility model's threaded assembly, through the threaded engagement of the screw and the slide bracket, and the guiding action of the guide rod, can precisely transport the PCB circuit board to the designated position above the etching housing. Furthermore, the position can be adjusted at any time during transportation to meet different work requirements. Simultaneously, the drive unit can rotate the PCB circuit board, allowing it to receive the etching solution from multiple angles during etching, ensuring uniform etching, improving etching quality, and avoiding insufficient etching in some areas due to a single angle. In the detachable assembly, the second electric push rod can flexibly adjust the position of the mounting block, facilitating the installation of the clamping bracket in the appropriate position and clamping the PCB circuit board via the slot and the clamping block. The combination of the clamping brackets and the tightening of the bolts ensures that the installation of the clamping brackets is stable and reliable. Moreover, when it is necessary to replace the clamping brackets of different specifications to adapt to PCB circuit boards of different sizes, the operation is simple and convenient. Just loosen the bolts and pull out the clips to replace them, which improves the versatility of the equipment. At the same time, the first drive shaft in the stirring assembly drives the first stirring plate and the side flipping plate to rotate, which can stir and tumble the etching solution from different directions, accelerate the mixing of the etching solution, and make the chemical components in the etching solution evenly distributed. This ensures that the concentration and activity of the etching solution in contact with different parts of the PCB circuit board are consistent during the etching process, effectively improving the etching effect and avoiding the etching quality difference caused by uneven etching solution.

[0013] Secondly, the driving component of this invention drives the second stirring plate and the flipping plate to circulate the cleaning fluid, providing a comprehensive rinse for the PCB circuit board. This quickly removes most of the residual etching solution and impurities from the surface. Simultaneously, the rotating brush further enhances the cleaning effect, effectively removing residues from tiny crevices and holes on the PCB surface, improving the thoroughness of the cleaning and ensuring the cleanliness of the PCB. Through the cooperation of the threaded assembly and the lifting assembly, the PCB circuit board can be easily transferred from the etching shell to the cleaning shell, and then to the support plate of the heating assembly. The height of the PCB circuit board can be accurately adjusted at various positions using the first electric push rod, ensuring its stable placement on the support frame. The entire transfer and fixing process is simple to operate, reducing manual intervention and the risk of operational errors. The hot air generated by the main heat generator in the heating assembly is evenly blown onto the surface of the PCB circuit board through conduits and nozzles, quickly evaporating residual moisture and achieving efficient drying of the PCB circuit board, thus improving production efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the etched outer shell and the cleaning outer shell of this utility model; Figure 3 This is a schematic diagram of the slide rail bracket structure of this utility model; Figure 4 This is a schematic diagram of the mounting plate structure of this utility model; Figure 5 This is a schematic diagram of the catheter structure of this utility model.

[0015] In the diagram: 1. Mounting base; 2. Etched outer shell; 201. First drive shaft; 202. First stirring plate; 203. Side flipping plate; 3. Cleaning outer shell; 301. Second drive shaft; 302. Second stirring plate; 303. Flipping plate; 304. Brush; 4. Support plate; 401. Conduit; 402. Nozzle; 403. Hot gas generating body; 404. Support frame; 5. Support rod; 501. Fixing plate; 502. Slide rail bracket; 503. Screw; 504. Slide rod bracket; 505. Guide rod; 506. Limiting block; 6. Drive body; 601. Mounting bracket; 602. First electric push rod; 603. Mounting plate; 604. Vertical plate; 605. Second electric push rod; 606. Mounting block; 607. Slot; 608. Locking block; 609. Clamping bracket. Detailed Implementation

[0016] 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.

[0017] Please see Figures 1-5 This utility model provides a technical solution: a PCB circuit board etching device for new energy vehicles, including a mounting base 1, on which a processing mechanism for etching PCB circuit boards for new energy vehicles is provided, the processing mechanism including: The etching assembly includes a support rod 5 fixed at four ends on the upper surface of the mounting base 1. A fixing plate 501 is fixed at the top of the support rod 5. A slide rail bracket 502 is fixed on the inner wall of the fixing plate 501. A slide rod bracket 504 connected by a threaded assembly is provided inside the slide rail bracket 502. A drive body 6 is fixed at the lower end of the slide rod bracket 504. A mounting bracket 601 is fixed at the lower end of the drive body 6. A mounting plate 603 connected by a lifting assembly is provided at the lower end of the mounting bracket 601. A clamping bracket 609 connected by a detachable assembly is provided inside the mounting plate 603. An etching shell 2 is provided on the upper surface of the mounting base 1. A stirring assembly for mixing the etching solution is provided inside the etching shell 2. The cleaning assembly includes a cleaning housing 3 on the right side of the etched housing 2, a second stirring plate 302 connected to the cleaning housing 3 via a drive assembly, brushes 304 uniformly arranged on the upper surface of the second stirring plate 302, and a heating assembly for drying on the right side of the cleaning housing 3.

[0018] In a preferred embodiment, the threaded assembly includes a screw 503 rotatably connected inside the slide rail bracket 502, guide rods 505 fixed at both ends of the inner wall of the fixing plate 501, a slide rod bracket 504 slidably connected to the outer wall of the guide rods 505, the slide rod bracket 504 being threadedly connected to the screw 503, a limit block 506 fixed at the upper end of the slide rail bracket 502, and a lifting assembly including a first electric push rod 602 fixedly through the mounting bracket 601, with the mounting plate 603 located below the first electric push rod 602. The detachable component includes a vertical plate 604 fixed at both ends of the lower end face of the mounting plate 603. A second electric push rod 605 is fixed to the inner wall of the vertical plate 604. A mounting block 606 is fixed to the telescopic end of the second electric push rod 605. A pair of slots 607 are passed through the inside of the mounting block 606. A clamping block 608 is inserted into the inside of the slots 607. A clamping bracket 609 is fixedly connected to one end of the clamping block 608. Bolts are provided on the side wall of the mounting block 606 to connect the clamping block 608 to the mounting block 606.

[0019] The screw 503 in the threaded assembly is rotated by the motor. Since the slide rod bracket 504 is threadedly connected to the screw 503 and slides on the outer wall of the guide rod 505, the rotation of the screw 503 will cause the slide rod bracket 504 to move horizontally along the guide rod 505 within the slide rail bracket 502. When the slide rod bracket 504 moves to the appropriate position, the limit block 506 limits it to prevent it from moving excessively.

[0020] Furthermore, the first electric push rod 602 in the lifting assembly is activated. The first electric push rod 602 extends and retracts, causing the mounting plate 603 to move up and down, thereby adjusting the height of the mounting plate 603 and the connecting components below it.

[0021] Furthermore, the telescopic end of the second electric push rod 605 pushes the mounting block 606 to move towards the PCB circuit board. When the mounting block 606 approaches the PCB circuit board, the circuit board is clamped and fixed by the clamping bracket 609. The new energy vehicle PCB circuit board is clamped by the clamping bracket 609 and then moved above the etching shell 2. Then it is lowered so that the circuit board enters the etching shell 2 and comes into contact with the etching liquid inside the etching shell 2 for etching. The drive body 6 is started. The drive body 6 drives the mounting bracket 601 and the PCB circuit board below it to rotate around the output shaft of the drive body 6, adjusting the angle of the PCB circuit board so that it can be etched in the best posture.

[0022] When the clamping bracket 609 needs to be replaced, first unscrew the bolts on the side wall of the mounting block 606 that connect the locking block 608 to the mounting block 606, so that the locking block 608 can be pulled out of the slot 607. Remove the old clamping bracket 609. When installing the new clamping bracket 609, insert the locking block 608 into the slot 607, then control the second electric push rod 605 to adjust the position, and finally tighten the bolts to fix it.

[0023] The limiting block 506 is used to limit the sliding rod bracket 504, and to limit the clamping bracket 609 at the lower end of the sliding rod bracket 504 when it is moved to the etched shell 2.

[0024] In a preferred embodiment, the stirring assembly includes a first drive shaft 201 rotatably connected to the bottom of the etched shell 2. A first stirring plate 202 is fixed to the outer wall of the first drive shaft 201, and a side-flipping plate 203 is fixed to the end of the first stirring plate 202. The first drive shaft 201 is driven by a micro motor, which drives the first drive shaft 201 to rotate at the bottom of the etched shell 2. The first stirring plate 202 fixed to the outer wall of the first drive shaft 201 rotates accordingly, stirring the etching solution inside the etched shell 2. At the same time, the side-flipping plate 203 fixed to the end of the first stirring plate 202 will flip the etching solution upward during rotation, making the etching solution more evenly mixed and avoiding sedimentation.

[0025] In a preferred embodiment, the driving assembly includes a second drive shaft 301 rotatably connected to the bottom of the cleaning housing 3. A second stirring plate 302 is fixedly connected to the upper end of the second drive shaft 301, and a flipping plate 303 is fixed to the end of the second stirring plate 302. After the PCB circuit board is etched in the etching housing 2, the threaded assembly is activated. Driven by the screw 503, the slide bracket 504 moves the clamped PCB circuit board from above the etching housing 2 to directly above the cleaning housing 3. The first electric push rod 602 in the lifting assembly is activated, and the first electric push rod 602 extends, slowly placing the PCB circuit board into the cleaning housing 3. The second drive shaft 301 is also activated. A micro motor is used to rotate, driving the second drive shaft 301 to rotate at the bottom of the cleaning housing 3. The second stirring plate 302 fixed at the upper end of the second drive shaft 301 rotates accordingly. During the rotation, the second stirring plate 302 pushes the cleaning liquid inside the cleaning housing 3 to flow. At the same time, the flipping plate 303 fixed at its end lifts the cleaning liquid upward, so that the cleaning liquid forms a circulation flow and performs a preliminary rinsing of the PCB circuit board. As the second stirring plate 302 rotates, the brushes 304 evenly arranged on its upper surface also rotate. When the brushes 304 rotate to contact the PCB circuit board, they brush the surface of the PCB circuit board to further remove residual etching liquid and impurities.

[0026] In a preferred embodiment, the heating assembly includes a support plate 4 disposed on the upper surface of the mounting base 1 on the right side of the cleaning housing 3. A support frame 404 for supporting the circuit board is fixed on the inner wall of the support plate 4. A conduit 401 is fixed on the upper end of the support plate 4. Nozzles 402 are evenly distributed on the side of the conduit 401 near the support frame 404. A hot air generating body 403 is disposed at the input end of the conduit 401, and the hot air generating body 403 is disposed on the mounting base 1.

[0027] After cleaning, the first electric push rod 602 in the lifting assembly is activated. The first electric push rod 602 shortens, lifting the PCB circuit board out of the cleaning housing 3 for a brief water drain. After water drain, the threaded assembly is activated again, and the slide bracket 504 moves the PCB circuit board to the support plate 4 of the heating assembly. The first electric push rod 602 in the lifting assembly is activated, and the first electric push rod 602 extends, placing the PCB circuit board on the support frame 404 on the inner wall of the support plate 4. The hot air generating body 403 in the heating assembly is activated, generating hot air, which is delivered to the side near the support frame 404 through the conduit 401, and then sprayed out from the evenly distributed nozzles 402 to dry the PCB circuit board and remove residual moisture from the surface.

[0028] The electric actuator mentioned above is model LAM20 series, the drive motor model can be 57BYGH, the micro motor model can be FF-130SH, and the hot air generator can be model HF-10 small device.

[0029] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0030] When etching the PCB circuit board of new energy vehicles, the mounting block 606 is first pushed towards the PCB circuit board by the telescopic end of the second electric push rod 605. The circuit board is clamped and fixed by the clamping bracket 609. If the clamping bracket 609 needs to be replaced, the bolts on the side wall of the mounting block 606 can be unscrewed, the card block 608 can be pulled out from the card slot 607, and after replacement, the card block 608 can be inserted into the card slot 607 and the bolts can be tightened to fix it. Subsequently, the motor rotates the screw 503 in the threaded assembly. Because the slide bracket 504 is threadedly connected to the screw 503 and slides on the outer wall of the guide rod 505, the slide bracket 504 will move horizontally along the guide rod 505 in the slide rail bracket 502. When it moves to a suitable position above the etching shell 2, the limit block 506 limits it to prevent excessive movement. Then, the first electric push rod 602 in the lifting assembly is activated, which extends and retracts to drive the mounting plate 603 and the components below to descend, allowing the circuit board to enter the etching shell 2 and contact the etching solution. At the same time, the drive body 6 is activated, which drives the mounting bracket 601 and the PCB circuit board below to rotate and adjust the angle. During the etching process, the micro motor drives the first drive shaft 201 to rotate, which drives the first stirring plate 202 and the side flip plate 203 to rotate, stirring the etching solution and flipping it upward to make it evenly mixed. After etching, the first electric push rod 602 shortens to lift the circuit board, and then moves it to the top of the cleaning housing 3 via the threaded assembly. The first electric push rod 602 extends to place the circuit board into the cleaning housing 3. The micro motor drives the second drive shaft 301 to rotate, which in turn drives the second stirring plate 302 and the tilting plate 303 to rotate, so that the cleaning liquid circulates to initially rinse the circuit board. At the same time, the brush 304 on the second stirring plate 302 rotates to brush the surface of the circuit board. After cleaning, the first electric push rod 602 shortens to lift the circuit board to drain the water, and then moves it to the top of the support plate 4 via the threaded assembly. The first electric push rod 602 extends to place the circuit board on the support frame 404. The hot air generator 403 is activated, and the generated hot air is sprayed out from the nozzle 402 through the conduit 401 to dry the circuit board.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] 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 PCB etching device for new energy vehicles, comprising a mounting base (1), characterized in that: The mounting base (1) is provided with a processing mechanism for etching PCB circuit boards for new energy vehicles. The processing mechanism includes: The etching assembly includes a support rod (5) fixed at four ends on the upper surface of the mounting base (1). A fixing plate (501) is fixed at the top of the support rod (5). A slide rail bracket (502) is fixed on the inner wall of the fixing plate (501). A slide rod bracket (504) connected by a threaded assembly is provided inside the slide rail bracket (502). A drive body (6) is fixed at the lower end of the slide rod bracket (504). A mounting bracket (601) is fixed at the lower end of the drive body (6). A mounting plate (603) connected by a lifting assembly is provided at the lower end of the mounting bracket (601). A clamping bracket (609) connected by a detachable assembly is provided inside the mounting plate (603). An etching shell (2) is provided on the upper surface of the mounting base (1). A stirring assembly for mixing etching solution is provided inside the etching shell (2). The cleaning assembly includes a cleaning housing (3) disposed on the right side of the etched housing (2), a second stirring plate (302) connected by a drive assembly disposed inside the cleaning housing (3), a brush (304) uniformly disposed on the upper surface of the second stirring plate (302), and a heating assembly for drying disposed on the right side of the cleaning housing (3).

2. The etching device for PCB circuit boards of new energy vehicles according to claim 1, characterized in that: The threaded assembly includes a screw (503) rotatably connected inside the slide rail bracket (502), guide rods (505) fixed at both ends of the inner wall of the fixing plate (501), a slide rod bracket (504) slidably connected to the outer wall of the guide rod (505), the slide rod bracket (504) being threadedly connected to the screw (503), and a limit block (506) fixed at the upper end of the slide rail bracket (502).

3. The etching device for PCB circuit boards of new energy vehicles according to claim 1, characterized in that: The lifting assembly includes a first electric push rod (602) fixedly fixed inside the mounting bracket (601), and a mounting plate (603) fixedly connected to the lower end of the first electric push rod (602). The detachable assembly includes a vertical plate (604) fixed at both ends of the lower end face of the mounting plate (603). A second electric push rod (605) is fixed to the inner wall of the vertical plate (604). A mounting block (606) is fixed to the telescopic end of the second electric push rod (605). A pair of slots (607) are passed through the interior of the mounting block (606). A locking block (608) is inserted into the interior of the slots (607). A clamping bracket (609) is fixedly connected to one end of the locking block (608). Bolts are provided on the side wall of the mounting block (606) to connect the locking block (608) to the mounting block (606).

4. The etching device for PCB circuit boards of new energy vehicles according to claim 1, characterized in that: The stirring assembly includes a first drive shaft (201) rotatably connected to the bottom of the etched shell (2), a first stirring plate (202) is fixed to the outer wall of the first drive shaft (201), and a side flap (203) is fixed to the end of the first stirring plate (202).

5. The etching device for PCB circuit boards of new energy vehicles according to claim 1, characterized in that: The drive assembly includes a second drive shaft (301) rotatably connected to the bottom of the inner part of the cleaning shell (3), a second stirring plate (302) fixedly connected to the upper end of the second drive shaft (301), and a flipping plate (303) fixed to the end of the second stirring plate (302).

6. The etching device for PCB circuit boards of new energy vehicles according to claim 1, characterized in that: The heating assembly includes a mounting base (1) with a support plate (4) located on the right side of the cleaning housing (3). The inner wall of the support plate (4) is fixed with a support frame (404) for supporting the circuit board. The upper end of the support plate (4) is fixed with a conduit (401). The conduit (401) has nozzles (402) evenly distributed on the side of the conduit (401) near the support frame (404). The input end of the conduit (401) is provided with a hot air generating body (403), and the hot air generating body (403) is set on the mounting base (1).

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