Metal shell closing opening welding device for telecommunication machine shell machining

Abstract

The invention discloses a metal shell closing opening welding device for telecommunication machine shell machining, and relates to the technical field of welding. A metal shell closing opening welding device for telecommunication machine shell machining comprises a machining table, the top end of the machining table is fixedly connected with two vertical plates which are transversely symmetrical, a transverse plate is connected between the two vertical plates in a sliding mode, and the vertical plate on one side is fixedly connected with a hydraulic cylinder. The telecommunication machine shell is fixed to the containing plate through the suction cup and then fixed again through the left clamping plate and the right clamping plate, displacement of the telecommunication machine shell during welding is prevented, and when one face welding is completed, after the clamping plates are opened, the driving teeth can also be matched with the ratchet wheel to control the containing plate to drive the telecommunication machine shell to rotate to switch the welding face; and under the action of the positioning plate and the extension of the first spring, the sliding plate can slide back and forth, so that the telecommunication machine shell can rotate to change the surface conveniently, the telecommunication machine shell can still cling to the positioning plate after rotating to change the surface, and the replaced welding surface can be accurately positioned below the welding gun.

Description

Technical Field

[0001] The invention relates to the field of welding technology, in particular to a metal shell closed-mouth welding device for processing a telecommunication shell. Background Art

[0002] With the development of intelligent networked vehicles, the integration of electric vehicles and communication technology is becoming increasingly important. In the manufacturing of modern telecommunication equipment, the processing of telecommunication housing is one of the most important links. In order to ensure that the telecommunication housing has sufficient strength and sealing, it is usually necessary to perform multi-faceted welding on its closed opening.

[0003] However, the existing welding technology and equipment have the following deficiencies: In the traditional welding process, after each welding surface is completed, the position of the shell needs to be adjusted so that the next welding surface can be placed under the welding gun. In the existing technology, if mechanical surface changing is directly adopted, it cannot meet the needs of adapting to shells of different sizes, and cannot ensure that the welding surface after surface changing is aligned with the welding gun. Especially when dealing with long sides, short sides or other special sizes of shells, welding deviation is prone to occur, resulting in poor welding effect; and manual surface changing operation not only increases the labor intensity of workers, but also requires pauses and repositioning each time the surface is changed, which is cumbersome and time-consuming, and cannot meet the needs of efficient production.

[0004] In order to solve the above problems, we proposed a metal shell closed-mouth welding device for telecommunication shell processing. This welding device can automatically switch the welding surface, improve welding efficiency, and ensure that the welding surface of the shell of different sizes is accurately positioned and aligned with the welding gun after replacement. Summary of the invention

[0005] In order to overcome the shortcoming that the existing welding equipment cannot accurately align the welding surface of the casing of different sizes with the welding gun after replacement, the present invention provides a metal shell closed-mouth welding device for processing the telecommunication shell. The welding device can automatically convert the welding surface, improve the welding efficiency, and ensure that the welding surface of the casing of different sizes after replacement is accurately positioned and aligned with the welding gun.

[0006] A closed-mouth welding device for metal shells used for processing telecommunication machine shells comprises a processing table, two transversely symmetrical vertical plates are fixedly connected to the top of the processing table, a horizontal plate is slidably connected between the two vertical plates, a hydraulic cylinder is fixedly connected to the vertical plate on one side, the telescopic end of the hydraulic cylinder is fixedly connected to the horizontal plate, a rodless cylinder is fixedly connected to the horizontal plate, a sliding block is slidably connected to the rodless cylinder, a welding gun is fixedly connected to the bottom end of the sliding block, and a guide frame is fixedly connected to the top of the processing table, a sliding plate is slidably connected in the guide frame, two first springs are connected between the sliding plate and the guide frame, a mounting frame is fixedly connected to the sliding plate, a placement plate is rotatably connected to the mounting frame, and a side of the top of the processing table close to the vertical plates A positioning plate is fixedly connected, and sliding frames are slidably connected to the two horizontal parts of the mounting frame. A clamping plate is fixedly connected to the sides of the sliding frames that are away from each other, and a second spring is connected between the sides of the sliding frames that are close to each other. Electric push rods are fixedly connected to the two longitudinal sides of the mounting frame, and the extension directions of the two electric push rods are opposite. The telescopic ends of the electric push rods are in contact with adjacent sliding frames. A ratchet is fixedly connected to the rotational connection between the placement plate and the mounting frame, and a strip plate is fixedly connected to the sliding frame on one side. The side of the strip plate close to the ratchet is rotationally connected with equidistantly distributed driving teeth, and the driving teeth are extruded and fitted with the ratchet. A torsion spring is connected between the driving teeth and the strip plate, and a fixing component for fixing the housing of the telecommunication machine is provided on the placement plate.

[0007] Optionally, a side of the strip plate close to the driving tooth is provided with equally spaced limiting protrusions for limiting the driving tooth from rotating to the left.

[0008] Optionally, the fixing component includes a hollow cylinder, which is fixedly connected to the four corners of the placement plate, a suction cup is connected to the top of the hollow cylinder, a piston rod is slidably connected inside the hollow cylinder, a third spring is connected between the piston rod and the hollow cylinder, a connecting plate is fixedly connected between two laterally corresponding piston rods, a push rod is fixedly connected to the middle of the connecting plate, and the push rod passes through the upper side of the placement plate.

[0009] Optionally, a smoke exhaust assembly is also included for exhausting waste gas generated by welding. The smoke exhaust assembly includes a placement mesh frame, the placement mesh frame is fixedly connected to a positioning plate, the placement mesh frame is fixedly connected to a mounting plate, and the mounting plate is fixedly connected to equidistantly distributed fans.

[0010] Optionally, the grid structure placed on the side of the grid frame away from the mounting plate is detachable to facilitate replacement of the purification material inside.

[0011] Optionally, a cleaning component for pre-cleaning the welding area is also included, the cleaning component includes a slider, the slider is slidably connected to the sliding block, a fourth spring is connected between the slider and the sliding block, a vertical pipe is fixedly connected to the slider, the bottom end of the vertical pipe is connected to a nozzle, an air pump is fixedly connected to the sliding block, and a connecting pipe is connected between the air pump and the top end of the vertical pipe.

[0012] Optionally, the connecting pipe is a hose so that the slider drives the nozzle to move.

[0013] The beneficial effects of the present invention are as follows: 1. The telecommunication housing is fixed on the placement plate by a suction cup, and then fixed again by two left and right clamps to prevent displacement of the telecommunication housing during welding. When one side of the welding is completed, the clamp is opened, and the driving teeth will cooperate with the ratchet to control the placement plate to drive the telecommunication housing to rotate and switch the welding surface. Moreover, under the action of the positioning plate and the expansion and contraction of the first spring, the sliding plate can slide back and forth, which is convenient for the telecommunication housing to rotate and change the surface. At the same time, it can also ensure that the telecommunication housing is still close to the positioning plate after rotating and changing the surface, ensuring that the replaced welding surface is accurately positioned under the welding gun.

[0014] 2. During welding, the fan operates to draw air, causing the exhaust gas to gather in the mesh frame, and then be purified by the purification material in the mesh frame, reducing pollution to the processing environment.

[0015] 3. The air pump operates to eject air through the nozzle. When the welding gun moves horizontally for welding, the nozzle is located in front of the welding gun to clean the welding part of the telecommunication machine casing first to avoid impurities in the welding part of the telecommunication machine casing affecting the welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the processing table, vertical plate, horizontal plate, hydraulic cylinder and other components of the present invention.

[0018] Figure 3 It is a three-dimensional structural schematic diagram of the guide frame, sliding plate, mounting frame and other components of the present invention.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the guide frame, the sliding plate and the first spring of the present invention.

[0020] Figure 5 It is a three-dimensional structural schematic diagram of components such as the mounting frame, the placement plate and the positioning plate of the present invention.

[0021] Figure 6 It is a three-dimensional structural schematic diagram of the sliding frame, the second spring, the ratchet and other components of the present invention.

[0022] Figure 7 It is a schematic diagram of the three-dimensional structure of the strip plate, driving teeth and torsion spring of the present invention.

[0023] Figure 8 It is a three-dimensional structural schematic diagram of the suction cup, connecting plate, ejector rod and other components of the present invention.

[0024] Fig. 9It is a three-dimensional structural schematic diagram of the hollow cylinder, suction cup, piston rod and third spring of the present invention.

[0025] Fig.10 It is a three-dimensional structural schematic diagram of the positioning plate and the screen frame and other components of the present invention.

[0026] Fig.11 This is a schematic diagram of the three-dimensional structure of the present invention for placing components such as a screen frame and a mounting plate.

[0027] Fig.12 It is a schematic diagram of the three-dimensional structure of the mounting plate and the fan of the present invention.

[0028] Fig.13 It is a schematic diagram of the three-dimensional structure of the vertical pipe, nozzle, air pump, connecting pipe and other components of the present invention.

[0029] Markings in the accompanying drawings: 1: processing table, 2: vertical plate, 3: horizontal plate, 4: hydraulic cylinder, 5: rodless cylinder, 6: sliding block, 7: welding gun, 8: guide frame, 9: sliding plate, 91: first spring, 10: mounting frame, 101: placement plate, 102: positioning plate, 11: sliding frame, 12: clamping plate, 121: second spring, 13: electric push rod, 14: ratchet, 15: strip plate, 16: driving tooth, 17: torsion spring, 18: hollow cylinder, 19: suction cup, 20: piston rod, 21: third spring, 22: connecting plate, 23: push rod, 24: placement screen frame, 25: mounting plate, 26: fan, 27: slider, 28: fourth spring, 29: vertical pipe, 30: nozzle, 31: air pump, 32: connecting pipe. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0031] Embodiment 1: A metal shell closed-mouth welding device for processing a telecommunication housing, such as Figure 1-Figure 7As shown, it includes a processing table 1, a vertical plate 2, a horizontal plate 3, a hydraulic cylinder 4, a rodless cylinder 5, a sliding block 6, a welding gun 7, a guide frame 8, a sliding plate 9, a first spring 91, a mounting frame 10, a placement plate 101, a positioning plate 102, a sliding frame 11, a clamping plate 12, a second spring 121, an electric push rod 13, a ratchet 14, a strip plate 15, a driving tooth 16, a torsion spring 17 and a fixing assembly. The upper rear part of the processing table 1 is fixedly connected with two vertical plates 2 symmetrically on the left and right sides, and the two vertical plates 2 on the left and right sides are slidably connected to each other. There is a horizontal plate 3, a hydraulic cylinder 4 is fixedly connected to the vertical plate 2 on the left, the telescopic end of the hydraulic cylinder 4 is fixedly connected to the horizontal plate 3, a rodless cylinder 5 is fixedly connected to the horizontal plate 3, a sliding block 6 is slidably connected to the rodless cylinder 5, a welding gun 7 is fixedly connected to the lower part of the sliding block 6, a guide frame 8 is fixedly connected to the upper side of the processing table 1, a sliding plate 9 is slidably connected to the guide frame 8, two first springs 91 symmetrically connected between the sliding plate 9 and the guide frame 8, a mounting frame 10 is fixedly connected to the sliding plate 9, and the upper part of the mounting frame 10 is rotated A placing plate 101 is movably connected, a positioning plate 102 is fixedly connected to the upper rear of the processing table 1, the left and right parts of the mounting frame 10 are slidably connected to the sliding frames 11, the sides of the sliding frames 11 that are away from each other are fixedly connected to the clamping plate 12, and the sides of the two sliding frames 11 that are close to each other are connected to the second spring 121, the front and rear sides of the mounting frame 10 are fixedly connected to the electric push rods 13, the extension directions of the two electric push rods 13 are opposite, the telescopic ends of the electric push rods 13 are in contact with the adjacent sliding frames 11, and the placing plate 10 A ratchet 14 is fixedly connected to the rotation connection between the mounting frame 10 and the mounting frame 10, a strip plate 15 is fixedly connected to the right sliding frame 11, and four equally spaced driving teeth 16 are rotatably connected to the left portion of the strip plate 15. Four equally spaced limiting protrusions are provided on the left portion of the strip plate 15 to limit the driving teeth 16 from rotating to the left. The driving teeth 16 are pressed and matched with the ratchet 14, and a torsion spring 17 is connected between the driving teeth 16 and the strip plate 15. A fixing component for fixing the housing of the telecommunication machine is provided on the placement plate 101.

[0032] In the initial state, the electric push rod 13 is in an extended state to support the sliding frame 11, the second spring 121 is in a stretched state, and the left and right clamps 12 are in an open state. When using the device, the staff puts the telecommunication casing to be welded on the placement plate 101, fixes the telecommunication casing by the fixing assembly, so that the rear side of the telecommunication casing contacts the positioning plate 102, and positions the telecommunication casing by the positioning plate 102. At this time, the staff controls the electric push rod 13 to shorten, and the electric push rod 13 shortens and no longer supports the sliding frame 11. At this time, under the action of the second spring 121 resetting, the sliding frame 11 drives the clamps 12 to move inwards, and the clamps 12 move inwards to clamp the left and right sides of the telecommunication casing, thereby fixing the telecommunication casing and the placement plate 101. The position of the placement plate 101 is prevented from abnormal rotation and displacement of the telecommunication housing caused by the placement plate 101 when the welding gun 7 is welding. When the clamping plate 12 is close to the telecommunication housing, the electric push rod 13 continues to shorten and will separate from the sliding frame 11, so that the clamping plate 12 can clamp telecommunication housings of different sizes. When the telecommunication housing is fixed, the staff drives the cross plate 3 to slide downward through the hydraulic cylinder 4. The downward sliding of the cross plate 3 drives the rodless cylinder 5, the sliding block 6 and the welding gun 7 to descend, so that the welding gun 7 contacts the telecommunication housing. At this time, the sliding block 6 is driven by the rodless cylinder 5 to move horizontally, and then the welding gun 7 is driven to move horizontally to weld one side of the closed mouth of the telecommunication housing. After the welding of one side is completed, the cross plate 3 is driven to slide upward through the hydraulic cylinder 4 to perform welding. The welding gun 7 is lifted upward and separated from the telecommunication housing. At this time, the staff controls the electric push rod 13 to extend. When the electric push rod 13 extends to contact with the sliding frame 11, the electric push rod 13 continues to extend and pushes the sliding frame 11 to slide outward. The second spring 121 is stretched, and the sliding frame 11 slides outward to drive the clamping plate 12 to move outward to loosen the telecommunication housing. When the sliding frame 11 slides outward, it also drives the driving tooth 16 to move to the right through the strip plate 15. When the driving tooth 16 moves to the right to contact with the ratchet 14, the driving tooth 16 is restricted by the limiting protrusion and cannot rotate to the left. Therefore, the driving tooth 16 moves to the right and drives the ratchet 14 to rotate clockwise. The four driving teeth 16 drive the ratchet 14 to rotate clockwise by a quarter turn. The ratchet 14 rotates clockwise. The rotation of the needle drives the placement plate 101 to rotate. Under the action of the fixing component, the telecommunication housing is fixed on the placement plate 101, and then rotates clockwise with the placement plate 101 to switch to the next welding surface. When the telecommunication housing rotates, the corners of the telecommunication housing will also squeeze the positioning plate 102, so that the telecommunication housing moves forward, and the sliding plate 9 slides forward on the guide frame 8. The first spring 91 is stretched. When the telecommunication housing changes the surface, the sliding plate 9 will also slide backward on the guide frame 8 under the action of the rebound of the first spring 91, so that the telecommunication housing moves backward, ensuring that the switched welding surface is also in contact with the positioning plate 102. Positioning is performed through the positioning plate 102, so that the side of the telecommunication housing to be welded is always located below the welding gun 7.After the telecommunication housing is changed, the staff controls the electric push rod 13 to shorten and no longer support the sliding frame 11. The second spring 121 resets and controls the sliding frame 11 to drive the clamping plate 12 to move inward to clamp the telecommunication housing. When the sliding frame 11 slides inward, it also drives the strip plate 15 and the driving tooth 16 to move to the left. When the driving tooth 16 moves to the left and contacts the ratchet 14, the driving tooth 16 is squeezed by the ratchet 14 to rotate to the right, and the torsion spring 17 is deformed. After the driving tooth 16 is separated from the ratchet 14, the torsion spring 17 resets and drives the driving tooth 16 to reverse and reset. After the telecommunication housing is fixed again, the staff controls the welding gun 7 to descend through the hydraulic cylinder 4 again to weld the other side of the closed mouth of the telecommunication housing. In this way, after completing the welding of one side, it can automatically switch to the next side to be welded, and ensure that the replaced welding surface is accurately positioned under the welding gun 7.

[0033] like Figure 1 , Figure 8 and Fig. 9 As shown, the fixing assembly includes a hollow cylinder 18, a suction cup 19, a piston rod 20, a third spring 21, a connecting plate 22 and a push rod 23. The four corners of the placement plate 101 are fixedly connected with the hollow cylinder 18. The upper side of the hollow cylinder 18 is connected with the suction cup 19. The piston rod 20 is slidably connected inside the hollow cylinder 18. The third spring 21 is connected between the piston rod 20 and the hollow cylinder 18. A connecting plate 22 is fixedly connected between the two corresponding piston rods 20 on the left and right. A push rod 23 is fixedly connected to the middle part of the connecting plate 22, and the push rod 23 passes through the upper side of the placement plate 101.

[0034] When the device is used and the staff puts the telecommunication housing on the placement plate 101, the lower side of the telecommunication housing will first contact and fit with the suction cup 19, and the telecommunication housing will be fixed by the suction cup 19. During the downward movement of the telecommunication housing, while fitting with the suction cup 19, it will also contact with the push rod 23, thereby squeezing the push rod 23 to move downward. The downward movement of the push rod 23 drives the connecting plate 22 to move downward, and the downward movement of the connecting plate 22 drives the piston rod 20 to slide downward. The third spring 21 is compressed, and the piston rod 20 slides downward to make the hollow cylinder 18 in a negative pressure state, thereby making the suction cup 19 more firmly adsorbed. When the telecommunication housing is welded, the staff controls the telecommunication housing to move upward and separate from the push rod 23 and the suction cup 19. Under the action of the reset of the third spring 21, the piston rod 20 drives the connecting plate 22 and the push rod 23 to move upward and reset. In this way, the telecommunication housing can be fixed on the placement plate 101, so that the placement plate 101 drives the telecommunication housing to rotate and switch the welding surface.

[0035] Embodiment 2: Based on embodiment 1, Figure 1 , Fig.10 , Fig.11 and Fig.12As shown, it also includes a smoke exhaust component for exhausting waste gas generated by welding, and the smoke exhaust component includes a placement mesh frame 24, a mounting plate 25 and a fan 26. The placement mesh frame 24 is fixedly connected to the upper portion of the positioning plate 102, and the grid structure on the front side of the placement mesh frame 24 is detachable to facilitate replacement of the internal purification material. The placement mesh frame 24 is fixedly connected to the rear side of the mounting plate 25, and the mounting plate 25 is fixedly connected to fans 26 distributed equidistantly.

[0036] When using the device, the staff can put the material for purifying the waste gas (such as activated carbon) into the placement mesh frame 24. During the welding process, the fan 26 operates to suck air, so that the air is gathered in the placement mesh frame 24. The waste gas generated by welding will enter the placement mesh frame 24 for purification, thereby reducing the pollution to the processing environment.

[0037] like Figure 1 and Fig.13 As shown, a cleaning assembly for pre-cleaning the welding area is also included, and the cleaning assembly includes a slider 27, a fourth spring 28, a vertical pipe 29, a nozzle 30, an air pump 31 and a connecting pipe 32. The slider 27 is slidably connected to the lower part of the sliding block 6, and the fourth spring 28 is connected between the slider 27 and the sliding block 6. The slider 27 is fixedly connected to the vertical pipe 29, and the lower side of the vertical pipe 29 is connected to the nozzle 30. The upper part of the sliding block 6 is fixedly connected to the air pump 31, and the connecting pipe 32 is connected between the air pump 31 and the upper side of the vertical pipe 29. The connecting pipe 32 is a hose so that the slider 27 drives the nozzle 30 to move.

[0038] When the device is used, the air pump 31 operates to transport air to the vertical pipe 29 through the connecting pipe 32, and the air in the vertical pipe 29 is ejected through the nozzle 30. When the welding gun 7 moves horizontally for welding, the nozzle 30 is located in front of the moving direction of the welding gun 7. The welding part of the telecommunication housing is cleaned first to avoid impurities in the welding part of the telecommunication housing affecting the welding effect. When the nozzle 30 and the welding gun 7 move to the edgemost position, the telecommunication housing will squeeze the slider 27 and the vertical pipe 29. Under the action of the expansion and contraction of the fourth spring 28, the slider 27 can drive the vertical pipe 29 and the nozzle 30 to slide and contract to the right, so as to avoid the nozzle 30 getting stuck at the edge of the telecommunication housing and affecting the welding of the edge by the welding gun 7.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A closed-mouth welding device for metal shells used for processing a telecommunication housing, comprising a processing table (1), wherein two transversely symmetrical vertical plates (2) are fixedly connected to the top of the processing table (1), a horizontal plate (3) is slidably connected between the two vertical plates (2), a hydraulic cylinder (4) is fixedly connected to the vertical plate (2) on one side, a telescopic end of the hydraulic cylinder (4) is fixedly connected to the horizontal plate (3), a rodless cylinder (5) is fixedly connected to the horizontal plate (3), a sliding block (6) is slidably connected to the rodless cylinder (5), and a welding gun (7) is fixedly connected to the bottom end of the sliding block (6), wherein: The machine tool further comprises a guide frame (8), wherein the guide frame (8) is fixedly connected to the top of the processing table (1), a sliding plate (9) is slidably connected to the guide frame (8), two first springs (91) are connected between the sliding plate (9) and the guide frame (8), a mounting frame (10) is fixedly connected to the sliding plate (9), a placement plate (101) is rotatably connected to the mounting frame (10), a positioning plate (102) is fixedly connected to the side of the top of the processing table (1) close to the vertical plate (2), both lateral parts of the mounting frame (10) are slidably connected to the sliding frames (11), the sides of the sliding frames (11) away from each other are fixedly connected to the clamping plates (12), the sides of the sliding frames (11) close to each other are connected to the second springs (121), and the mounting frame (10) is fixedly connected to the vertical plate (2) on the top of the processing table (1). Both longitudinal sides of the frame (10) are fixedly connected with electric push rods (13), the extension directions of the two electric push rods (13) are opposite, the telescopic ends of the electric push rods (13) are in contact with the adjacent sliding frames (11), the rotational connection between the placement plate (101) and the mounting frame (10) is fixedly connected with a ratchet (14), one side of the sliding frame (11) is fixedly connected with a strip plate (15), the side of the strip plate (15) close to the ratchet (14) is rotationally connected with equally spaced driving teeth (16), the driving teeth (16) and the ratchet (14) are pressed together, and a torsion spring (17) is connected between the driving teeth (16) and the strip plate (15), and a fixing component for fixing the housing of the telecommunication machine is provided on the placement plate (101).

2. A metal shell closed-mouth welding device for processing a telecommunication housing according to claim 1, characterized in that: A side of the strip plate (15) close to the driving tooth (16) is provided with equally spaced limiting protrusions for limiting the driving tooth (16) from rotating to the left.

3. A metal shell closed-mouth welding device for processing a telecommunication housing according to claim 2, characterized in that: The fixing assembly comprises a hollow cylinder (18), the hollow cylinder (18) being fixedly connected to the four corners of the placement plate (101), the top end of the hollow cylinder (18) being connected to a suction cup (19), a piston rod (20) being slidably connected inside the hollow cylinder (18), a third spring (21) being connected between the piston rod (20) and the hollow cylinder (18), a connecting plate (22) being fixedly connected between two piston rods (20) corresponding to each other in the transverse direction, a push rod (23) being fixedly connected to the middle of the connecting plate (22), and the push rod (23) passing through the upper side of the placement plate (101).

4. A metal shell closed-mouth welding device for processing a telecommunication housing according to claim 3, characterized in that: It also includes a smoke exhaust component for exhausting waste gas generated by welding, the smoke exhaust component includes a placement mesh frame (24), the placement mesh frame (24) is fixedly connected to the positioning plate (102), the placement mesh frame (24) is fixedly connected to a mounting plate (25), and the mounting plate (25) is fixedly connected to fans (26) distributed at equal distances.

5. A metal shell closed-mouth welding device for processing a telecommunication housing according to claim 4, characterized in that: The grid structure on the side of the screen frame (24) away from the mounting plate (25) is detachably arranged so as to facilitate replacement of the purification material inside.

6. A metal shell closed-mouth welding device for processing a telecommunication housing according to claim 5, characterized in that: The cleaning assembly is also provided for pre-cleaning the welding position. The cleaning assembly comprises a slider (27), the slider (27) is slidably connected to the sliding block (6), a fourth spring (28) is connected between the slider (27) and the sliding block (6), a vertical pipe (29) is fixedly connected to the slider (27), a nozzle (30) is connected to the bottom end of the vertical pipe (29), an air pump (31) is fixedly connected to the sliding block (6), and a connecting pipe (32) is connected between the air pump (31) and the top end of the vertical pipe (29).

7. A metal shell closed-mouth welding device for processing a telecommunication housing according to claim 6, characterized in that: The connecting pipe (32) is a hose so that the slide block (27) can drive the nozzle (30) to move.

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