A fixing fixture and welding mechanism

Abstract

This utility model relates to the field of PCB board processing technology, and discloses a fixing fixture and a welding mechanism. The fixing fixture includes: a base with a vacuum groove; a bottom plate disposed on the base, with a vacuum hole communicating with the vacuum groove; a workpiece to be welded placed on the bottom plate; a limiting member between the bottom plate and the workpiece to be welded to restrict the movement of the workpiece; and a top cover disposed on the bottom plate and covering it, the top cover clamping the workpiece to be welded and pressing against the edge of the workpiece. The welding mechanism includes a fixing table and the aforementioned fixing fixture. The fixing table has a welding position inside and a material feeding position outside. The fixing fixture is slidably disposed on one side of the fixing table to switch between the material feeding position and the welding position. This utility model achieves the technical effects of correcting deformed PCB boards and improving the welding quality of PCB boards.

Description

Technical Field

[0001] This utility model belongs to the field of PCB board processing technology, specifically relating to a fixing fixture and welding mechanism. Background Technology

[0002] As a mechanical support carrier for various electronic components, the PCB board uses surface or internal circuitry and pads to achieve electrical connections and signal transmission between components. In the subsequent assembly process of the PCB board, soldering is a crucial step, its purpose being to firmly and reliably fix electronic components such as resistors, capacitors, and integrated circuits onto the PCB board.

[0003] PCB boards can be soldered using automatic soldering equipment. To ensure the accuracy of the soldering position, the automatic soldering equipment needs to be equipped with a fixture for supporting and fixing the PCB board. The fixture mainly includes a base with a frame that matches the shape of the PCB board. A vacuum adsorption component is set inside the frame. Before soldering, the PCB board is placed inside the frame, and the vacuum adsorption component adsorbs the PCB board, thus fixing and limiting the PCB board.

[0004] However, with the increasing demand for thinner and higher-density PCBs, PCBs are prone to inherent warping and deformation during processing and heating. Vacuum adsorption components have difficulty stably adsorbing deformed PCBs, resulting in a high vacuum alarm rate for the vacuum adsorption components. Utility Model Content

[0005] To address the shortcomings of the prior art, this utility model provides a fixing fixture and welding mechanism. The base plate and the top cover cooperate to press the four edges of the workpiece to be welded, which can correct the deformation of the workpiece to be welded and facilitate vacuum adsorption of the workpiece to be welded, so as to achieve the fixing of the workpiece to be welded.

[0006] The technical effects to be achieved by this utility model are realized through the following technical aspects: In a first aspect, this utility model provides a fixing fixture, comprising: a base having a vacuum groove; a bottom plate disposed on the base, the bottom plate having a vacuum hole communicating with the vacuum groove, a workpiece to be welded placed on the bottom plate, a limiting member for restricting the movement of the workpiece to be welded being provided between the bottom plate and the workpiece to be welded; and a top cover disposed on the bottom plate and covering the bottom plate, the top cover and the bottom plate clamping the workpiece to be welded, the top cover pressing against the edge of the workpiece to be welded.

[0007] In some implementations, a limiting hole is formed on the workpiece to be welded, and the limiting element includes a pin, which is disposed on the base plate and passes through the limiting hole to restrict the movement of the workpiece to be welded.

[0008] In some implementations, the base plate is detachably connected to the base, and the base is provided with a positioning component for positioning the base plate.

[0009] In some implementations, the positioning component includes: multiple side blocks surrounding the outside of the vacuum groove and forming a positioning area for accommodating the base plate; and a clamping structure slidably disposed on the base, the clamping structure and the side blocks cooperating to position the base plate.

[0010] In some implementations, a clamping groove is provided on the base plate, and the clamping structure includes a clamping bearing. The clamping bearing is driven by a clamping drive member, which drives the clamping bearing into the clamping groove. The clamping bearing cooperates with the side block to position the base plate.

[0011] Secondly, this utility model provides a welding mechanism, including a fixed platform and the aforementioned fixed fixture. The fixed platform has a welding position inside and a material feeding position outside. The fixed fixture is slidably disposed on one side of the fixed platform to slide and switch between the material feeding position and the welding position.

[0012] In some implementations, a movable seat is provided on one side of the base, and the movable seat is driven to be connected to a cutting component, which drives the movable seat to slide and switch between the feeding position and the welding position.

[0013] In some implementations, the fixed platform includes a welding top with a welding port. The base is driven by a lifting assembly for driving the base to move up and down. When the base is in the welding position, the lifting assembly drives the base to rise so that the top cover abuts against the welding top.

[0014] In some implementations, a dust removal assembly for welding dust removal is provided on the welding top.

[0015] In some implementations, the dust removal assembly includes: an air blowing block disposed on the top of the weld, the air blowing block blowing air into the weld joint; and a dust removal pipe disposed on the top of the weld and disposed opposite to the air blowing block.

[0016] In summary, this utility model has at least the following advantages: 1. The fixing fixture provided by this utility model places the workpiece to be welded on a base plate. Limiting components restrict the workpiece's movement on the base plate, achieving initial fixation. After the top cover is closed, it cooperates with the base plate to clamp the workpiece and presses down on its edges to correct warping and deformation. A vacuum is then created through a vacuum tank and vacuum holes to adsorb the workpiece, ensuring stable fixation and guaranteeing welding quality and effect. The fixing fixture has a simple structure and solves the problem of existing fixing fixtures failing to stably adsorb deformed PCB boards using vacuum adsorption components.

[0017] 2. The welding mechanism provided by this utility model has a fixing fixture that switches back and forth between the feeding position and the welding position, so as to realize the rapid fixing and welding of the workpiece to be welded. It is easy to operate and helps to improve production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the base structure according to a specific embodiment of the present utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the base plate and the top cover in a specific embodiment of the present utility model.

[0020] Figure 3 This is a schematic diagram of the structure of the fixing fixture according to a specific embodiment of the present utility model.

[0021] Figure 4 This is a schematic diagram of the structure of the fixed platform according to a specific embodiment of the present utility model.

[0022] Figure 5 This is a schematic diagram of the fixing fixture in the material feeding position according to a specific embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the fixing fixture in the welding position according to a specific embodiment of the present invention.

[0024] Marked in the image: 1. Base; 11. Vacuum tank; 12. Inner plate; 121. Inner hole; 13. Sealing ring; 14. Positioning assembly; 141. Side block; 142. Positioning area; 143. Clamping structure; 1431. Clamping bearing; 1432. Clamping drive; 15. Sensor; 16. Lifting assembly; 161. Lifting drive; 162. Linear bearing; 163. Movable guide rod; 2. Base plate; 21. Vacuum hole; 22. Limiting component; 23. Anchoring groove; 24. Alignment post; 3. Top cover; 31. Alignment hole; 4. PCB board; 41. Limiting holes; 5. Fixed platform; 51. Welding position; 52. Material feeding position; 53. Welding top; 531. Weld joint; 54. Dust removal assembly; 541. Air blowing block; 542. Dust removal pipe; 6. Moving seat; 61. Cut-off assembly; 611. Cut-off drive; 612. Slide rail; 613. Slider; 62. Mounting plate; 63. Buffer; 7. Frame; 71. Terminal box; 72. Solenoid valve assembly; 73. Vacuum gauge. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] Example 1: Please see Figure 1 and Figure 2 The fixing fixture of this utility model can be used to fix the PCB board 4 during the soldering process and to correct the deformed PCB board 4.

[0028] Please see Figure 1 The fixing fixture of this utility model includes a base 1, on which a vacuum groove 11 is provided. Specifically, an inner plate 12 is provided inside the vacuum groove 11, and an inner hole 121 is provided on the inner plate 12. The vacuum groove 11 can be connected to a vacuum pump, such as a vacuum pump, through the inner hole 121. The vacuum pump evacuates the vacuum groove 11 from the inner hole 121.

[0029] Please combine Figure 2 A base plate 2 is provided on the base 1. Specifically, the base plate 2 covers the vacuum tank 11. The base plate 2 has vacuum holes 21 that communicate with the vacuum tank 11. The PCB board 4 to be soldered is placed on the base plate 2. The vacuum equipment can vacuum-adsorb the PCB board 4 to be soldered through the vacuum tank 11 and the vacuum holes 21. In some specific embodiments, the base plate 2 has shallow grooves. The bottom wall of the shallow grooves is provided with an array of raised patterns. The raised patterns form staggered vacuum channels in the shallow grooves. The vacuum holes 21 are located on the bottom wall of the vacuum channels, which helps to increase the vacuum adsorption area of ​​the PCB board 4, thereby improving the stability of the PCB board 4 positioning.

[0030] In some other specific embodiments, a sealing ring 13 is provided between the base plate 2 and the base 1. The sealing ring 13 is located in the vacuum groove 11. The base plate 2 squeezes the sealing ring 13 so that the base plate 2 and the base 1 are sealed together at the vacuum groove 11, reducing the possibility of air leakage.

[0031] The PCB board 4 to be soldered is placed and fixed on the base plate 2. A limiting member 22 is provided between the base plate 2 and the PCB board 4 to be soldered to restrict the movement of the PCB board 4 to be soldered.

[0032] The base plate 2 is provided with an upper cover 3 that covers the base plate 2. The upper cover 3 and the base plate 2 clamp the PCB board 4 to be soldered. The upper cover 3 presses the edge of the PCB board 4 to be soldered. Specifically, the upper cover 3 can be a rectangular frame plate to form a hollow area to avoid the soldering area of ​​the PCB board 4.

[0033] Before soldering, the PCB board 4 to be soldered is loaded onto the base plate 2. The PCB board 4 is initially positioned by the limiting component 22. Then, the top cover 3 is closed and pressed tightly onto the PCB board 4 to correct any deformation. Vacuum is drawn at the vacuum groove 11 and vacuum hole 21, allowing the PCB board 4 to be vacuum-adsorbed onto the base plate 2 for fixation. Compared with traditional fixing fixtures, the base plate 2 and top cover 3 can correct warped and deformed PCB board 4 while fixing it. The fixing fixture is less prone to vacuum leakage. At the same time, it helps to improve the problem of inconsistent soldering height caused by unstable vacuum adsorption of PCB board 4, thereby ensuring the soldering quality of PCB board 4.

[0034] Example 2: The difference between this embodiment and Embodiment 1 is that, please refer to... Figure 2 In this embodiment, a limiting hole 41 is provided on the PCB board 4 to be soldered. The limiting member 22 includes a pin. The pin is provided on the base plate 2. When the PCB board 4 to be soldered is placed on the base plate 2, the pin is aligned with the limiting hole 41 and passes through the limiting hole 41. The pin restricts the movement of the PCB board 4 to be soldered.

[0035] In a preferred embodiment, the upper cover 3 has a notch for avoiding the pin, which facilitates the fit between the upper cover 3 and the PCB board 4 to be soldered to correct the deformation of the PCB board 4. Specifically, the upper cover 3 has an alignment hole 31, and the base plate 2 has an alignment post 24, which passes through the alignment hole 31, so that the upper cover 3 and the base plate 2 can be quickly aligned.

[0036] Please see Figure 1 and Figure 3In a preferred embodiment, the base plate 2 and the base 1 are detachably connected, facilitating the assembly of the base plate 2 and the top cover 3. The base 1 is provided with a positioning component 14 for positioning the base plate 2. Specifically, the positioning component 14 includes multiple side blocks 141, which surround the outer side of the vacuum groove 11 and form a positioning area 142 for accommodating the base plate 2. A pressing structure 143 is slidably provided on the base 1. When the base plate 2 is placed in the positioning area 142, the pressing structure 143 approaches the base plate 2 and presses the base plate 2 against the side blocks 141. The pressing structure 143, in conjunction with the side blocks 141, presses the base plate 2 against the side blocks 141, thus positioning the base plate 2 within the positioning area 142.

[0037] Please see Figure 2 and Figure 3 Furthermore, a clamping groove 23 is provided on the base plate 2. The clamping structure 143 includes a clamping bearing 1431, which is driven by a clamping drive member 1432. Specifically, the clamping drive member 1432 is preferably, but not limited to, a clamping cylinder. The piston rod of the clamping cylinder is driven by the clamping bearing 1431. The clamping drive member 1432 drives the clamping bearing 1431 into the clamping groove 23, and the clamping bearing 1431 cooperates with the side block 141 to clamp the base plate 2. In some specific embodiments, the clamping groove 23 is an arc-shaped groove, which is adapted to the clamping bearing 1431 to improve the stability of the clamping bearing 1431 pressing against the base plate 2 in the clamping groove 23.

[0038] Please see Figure 1 In some specific embodiments, a sensor 15 for detecting when the PCB board 4 is in place is provided on the base 1. Before welding, the PCB board 4 to be welded is first clamped and fixed by the base plate 2 and the top cover 3. When the base plate 2 and the top cover 3 holding the PCB board 4 to be welded are placed on the base 1, the sensor 15 detects that the PCB board 4 is in place, and the pressing drive 1432 drives the pressing bearing 1431 into the pressing groove 23 and presses against the base plate 2. The base plate 2 is then positioned in the positioning area 142. The sensor 15 can be a photoelectric sensor 15. The method of detecting the PCB board 4 by the photoelectric sensor 15 is known to those skilled in the art and is feasible. It will not be described in detail in this embodiment.

[0039] Example 3 This embodiment provides a welding mechanism based on the above embodiments.

[0040] A welding mechanism, please see Figure 4The fixture includes a fixed platform 5 and the aforementioned fixing jig. The fixed platform 5 has a welding position 51 inside and a material feeding position 52 outside. The fixing jig is slidably disposed on one side of the fixed platform 5 so as to slide and switch between the material feeding position 52 and the welding position 51. When the fixing jig is at the material feeding position 52, the PCB board 4 to be welded is fed onto the base plate 2 and fixed by the base plate 2 and the upper cover 3. When the fixing jig slides from the material feeding position 52 to the welding position 51, the PCB board 4 to be welded is welded.

[0041] Please see Figure 4 and Figure 5 In a preferred embodiment, the welding mechanism of this invention includes a frame 7, a fixed platform 5 mounted on the frame 7, and a fixed fixture slidably mounted on the frame 7. Specifically, a movable seat 6 is provided on one side of the base 1, and a cutting assembly 61 is driven to the movable seat 6. The cutting assembly 61 drives the movable seat 6 to slide and switch between the feeding position 52 and the welding position 51, and the movable seat 6 can drive the base 1 to move synchronously. Further, the cutting assembly 61 includes a cutting drive 611, which is driven to the movable seat 6. The cutting drive 611 is preferably, but not limited to, a cutting cylinder. The piston rod of the cutting cylinder is driven to the movable seat 6. By extending or retracting the piston rod of the cutting cylinder, the movable seat 6 moves back and forth between the feeding position 52 and the welding position 51.

[0042] The cutting assembly 61 also includes a slide rail 612, which is mounted on the frame 7. A slider 613 is slidably connected to the slide rail 612, and a movable seat 6 is mounted on the slider 613. The cutting drive 611 drives the movable seat 6 to move, and the slider 613 moves along the slide rail 612, which can guide the movable seat 6. A buffer structure for buffering the movable seat 6 is provided at one end of the slide rail 612 near the discharge position 52. The buffer structure includes a mounting plate 62, on which a buffer 63 is provided. The buffer 63 can limit the sliding distance of the movable seat 6 and play a buffering role.

[0043] Example 4 The difference between this embodiment and the above embodiments is that, please refer to [link / reference needed]. Figure 5 In this embodiment, the fixed platform 5 includes a welding top 53, and a welding port 531 is provided on the welding top 53. When the cutting drive 611 drives the moving seat 6 to slide to the welding position 51, the area to be welded on the PCB board 4 to be welded is within the welding port 531.

[0044] The base 1 is connected to a lifting assembly 16 for driving the base 1 to move up and down. When the base 1 is in the welding position 51, the lifting assembly 16 drives the base 1 to rise so that the upper cover 3 abuts against the welding top 53. The upper cover 3 is pressed onto the welding top 53. At this time, the clamping force between the welding top 53 and the upper cover 3 can be further applied to the edge of the PCB board 4 to be welded in order to correct the deformed PCB board 4.

[0045] In some specific embodiments, the lifting assembly 16 includes a lifting drive 161, which is preferably, but not limited to, a lifting cylinder, and the piston rod of the lifting cylinder is connected to the inner plate 12 in a driving connection.

[0046] When not in welding position, the movable seat 6 is located at the material feeding position 52 and is in its initial state. The PCB board 4 to be welded is clamped and fixed by the base plate 2 and the upper cover 3. The base plate 2, the upper cover 3, and the PCB board 4 to be welded are placed on the base 1. The clamping drive 1432 drives the clamping bearing 1431 to extend, and the clamping bearing 1431 clamps the base plate 2 against the side block 141, thus fixing the base plate 2. The PCB board 4 to be welded is fixed by vacuum adsorption. The lifting drive 161 drives the base 1 to descend relative to the movable seat 6. After the cutting drive 611 drives the movable seat 6 to slide to the welding position 51, the lifting drive 161 drives the base 1 to rise again, and the upper cover 3 abuts against the welding top 53, allowing the PCB board 4 to be welded. After welding is completed, the lifting drive 161 drives the base 1 to reset, the cutting drive 611 drives the moving seat 6 to return to the unloading position 52, the pressing drive 1432 drives the pressing bearing 1431 to retract, the vacuum tank 11 and vacuum hole 21 stop vacuuming, the PCB board 4 that has been welded is unloaded, and the next PCB board 4 to be welded can be loaded.

[0047] Specifically, the lifting assembly 16 also includes a linear bearing 162, which is mounted on the movable seat 6. A movable guide rod 163 passes through the linear bearing 162 and is connected to the base 1. When the lifting drive 161 drives the base 1 to move up and down relative to the movable seat 6, the movable guide rod 163 moves up and down within the linear bearing 162, and the movable guide rod 163 and the linear bearing 162 move the base 1 up and down.

[0048] In some specific embodiments, the inner wall of the welding top 53 is inclined so that the welding port 531 narrows downward. A dust removal component 54 is provided on the welding top 53 for welding dust removal.

[0049] Please see Figure 6Specifically, the dust removal assembly 54 includes an air blowing block 541, which is disposed on the soldering top 53. The air blowing block 541 blows air into the soldering joint 531 to remove dust generated during the soldering of the PCB board 4. A dust removal pipe 542 is disposed on the soldering top 53, opposite to the air blowing block 541. The dust removal pipe 542 can be externally collected. When the air blowing block 541 blows air, the dust is blown to the dust removal pipe 542, where it is collected, thus reducing the impact of dust on the soldering operation and environmental pollution.

[0050] In some specific embodiments, a terminal box 71 is provided on the frame 7. The terminal box 71 can reduce the amount of wiring and facilitate the maintenance and replacement of subsequent electrical components. A solenoid valve assembly 72 is provided on one side of the terminal box 71. The solenoid valve assembly 72 is electrically connected to the disconnection drive 611 to control the switching of the disconnection drive 611's operation. A vacuum gauge 73 is provided on one side of the solenoid valve assembly 72, which can be used to monitor the vacuum level of the vacuum pumping equipment. The terminal box 71, the solenoid valve assembly 72, and the vacuum gauge 73 are all known to those skilled in the art and are feasible, and will not be described in detail in this embodiment.

[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. 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. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0053] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0054] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0055] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A fixing jig characterized by comprising: include: The base (1) has a vacuum groove (11); A base plate (2) is disposed on the base (1). The base plate (2) has a vacuum hole (21) communicating with the vacuum groove (11). The workpiece to be welded is placed on the base plate (2). A limiting member (22) is provided between the base plate (2) and the workpiece to be welded to restrict the movement of the workpiece. The upper cover (3) is disposed on the base plate (2) and covers the base plate (2). The upper cover (3) and the base plate (2) clamp the workpiece to be welded. The upper cover (3) presses the edge of the workpiece to be welded.

2. The fixture of claim 1, wherein A limiting hole (41) is provided on the workpiece to be welded. The limiting member (22) includes a pin. The pin is provided on the base plate (2). The pin passes through the limiting hole (41) to restrict the movement of the workpiece to be welded.

3. The fixture of claim 1, wherein The base plate (2) is detachably connected to the base (1), and the base (1) is provided with a positioning component (14) for positioning the base plate (2).

4. The fixture of claim 3, wherein The positioning component (14) includes: Side blocks (141), multiple of which are provided, surround the outside of the vacuum groove (11) and form a positioning area (142) for accommodating the bottom plate (2); and The abutting structure (143) is slidably disposed on the base (1), and the abutting structure (143) and the side block (141) cooperate to position the bottom plate (2).

5. The fixture of claim 4, wherein The base plate (2) is provided with a clamping groove (23). The clamping structure (143) includes a clamping bearing (1431). The clamping bearing (1431) is connected to a clamping drive member (1432). The clamping drive member (1432) drives the clamping bearing (1431) into the clamping groove (23). The clamping bearing (1431) cooperates with the side block (141) to clamp the base plate (2).

6. A welding mechanism characterized by, The fixture includes a fixed platform (5) and a fixing jig as described in any one of claims 1-5. The fixed platform (5) has a welding position (51) inside and a feeding position (52) outside. The fixing jig is slidably disposed on one side of the fixed platform (5) to slide between the feeding position (52) and the welding position (51).

7. The welding mechanism of claim 6, wherein, A movable seat (6) is provided on one side of the base (1). The movable seat (6) is connected to a cutting component (61) and the cutting component (61) drives the movable seat (6) to slide and switch between the feeding position (52) and the welding position (51).

8. The welding mechanism of claim 6, wherein, The fixed platform (5) includes a welding top (53), on which a welding port (531) is provided. The base (1) is connected to a lifting assembly (16) for driving the base (1) to move up and down. When the base (1) is located at the welding position (51), the lifting assembly (16) drives the base (1) to rise so that the upper cover (3) abuts against the welding top (53).

9. The welding mechanism of claim 8, wherein, The welding top (53) is provided with a dust removal component (54) for welding dust removal.

10. The welding mechanism of claim 9, wherein, The dust removal assembly (54) includes: An air blowing block (541) is disposed on the welding top (53), and the air blowing block (541) blows air into the welding joint (531); and A dust removal pipe (542) is provided on the welding top (53) and is arranged opposite to the air blowing block (541).

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