Welding argon filling protection device

Abstract

The utility model belongs to the technical field of welding equipment, and particularly relates to a welding argon filling protection device. The utility model provides a welding argon filling protection device which is good in using effect. The device comprises a protective shell 1 of which the upper end is opened, and is characterized in that an air inlet pipe 3 is arranged on the protective shell 1, one side of the protective shell 1 is connected with one side of a connecting plate 4, the other side of the connecting plate 4 is connected with one side of a cantilever plate 11, a wall thickness pulling plate 9 and an adjusting supporting plate 12 are movably connected to the cantilever plate 11, and the wall thickness pulling plate 9 and the adjusting supporting plate 12 are arranged in the transverse direction; the wall thickness pulling plate 9 and the adjusting supporting plate 12 can move up and down and back and forth relative to the cantilever plate 11 and can be locked and positioned; a hanging plate 15 is arranged at the upper ends of the wall thickness pulling plate 9 and the adjusting supporting plate 12, and the upper ends of the wall thickness pulling plate 9 and the adjusting supporting plate 12 are arranged in a transverse strip-shaped groove 33 in the hanging plate 15.

Description

Technical Field

[0001] This utility model belongs to the technical field of welding equipment, and in particular relates to a welding argon gas protection device. Background Technology

[0002] When argon arc welding materials such as stainless steel, titanium, nickel, P91, and P92, argon gas protection is required on the back side to obtain good weld quality. For many large tanks, the interior must be completely purged with argon gas to completely replace the air before welding can begin; some require a dedicated person to purge the weld with argon gas on the back side (i.e., one person is responsible for welding, and another for purging with argon gas); this results in high gas or labor costs. Utility Model Content

[0003] This utility model addresses the above-mentioned problems by providing a welding argon gas protection device with good performance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The present invention includes a protective shell 1 with an open top. The protective shell 1 is characterized by having an air inlet pipe 3. One side of the protective shell 1 is connected to one side of a connecting plate 4, and the other side of the connecting plate 4 is connected to one side of a cantilever plate 11. A wall thickness pull plate 9 and an adjusting support plate 12 are movably connected to the cantilever plate 11. The wall thickness pull plate 9 and the adjusting support plate 12 are arranged laterally and can move up and down and back and forth relative to the cantilever plate 11 and can be locked in position. A hanging plate 15 is provided at the upper end of the wall thickness pull plate 9 and the adjusting support plate 12, and the upper end of the wall thickness pull plate 9 and the adjusting support plate 12 is placed in a horizontal groove 33 on the hanging plate 15.

[0005] As a preferred embodiment, the protective shell 1 of this invention has a transverse partition 2 in the middle, and a through hole 16 on the transverse partition 2. The air inlet pipe 3 is located at the lower end of the protective shell 1.

[0006] As another preferred embodiment, the air intake pipe 3 of this utility model is located at the lower end of the protective shell near the connecting plate 4.

[0007] As another preferred embodiment, the present invention has multiple through holes 16, which are evenly distributed on the transverse partition 2.

[0008] As another preferred embodiment, the cross-sectional area of ​​a single through hole 16 is smaller than the cross-sectional area of ​​the inner diameter of the air intake pipe 3, and the total cross-sectional area of ​​multiple through holes 16 is not less than the cross-sectional area of ​​the inner diameter of the air intake pipe 3.

[0009] As another preferred embodiment, the lower end of the cantilever plate 11 of this invention has a plurality of forward-extending limiting blocks 17.

[0010] As another preferred embodiment, the present invention provides three limiting blocks 17: one limiting block 17 is provided at the front end of the cantilever plate 11, one limiting block 17 is provided at the front part of the cantilever plate 11, and one limiting block 17 is provided at the middle part of the cantilever plate 11.

[0011] As another preferred embodiment, the upper end of the cantilever plate 11 of this invention has a support plate 18 that extends upward and bends backward.

[0012] As another preferred embodiment, the support plate 18 of this utility model is disposed at the front end of the cantilever plate 11.

[0013] As another preferred embodiment, the connecting plate 4 of this utility model is a horizontal L-shaped plate. The short horizontal plate of the horizontal L-shaped plate is connected to the protective shell 1. The upper outer part of the long horizontal plate of the horizontal L-shaped plate is provided with a first positioning pin hole, and the lower outer part of the long horizontal plate of the horizontal L-shaped plate is provided with an arc-shaped adjustment hole 5.

[0014] The upper part of the cantilever plate 11 near the connecting plate 4 is provided with a second positioning pin hole 19 corresponding to the first positioning pin hole, and the lower part of the cantilever plate 11 near the connecting plate 4 is provided with a connecting hole 20 corresponding to the arc-shaped adjustment hole 5.

[0015] The positioning pin 7 passes through the first positioning pin hole and the second positioning pin hole 19;

[0016] The bolt passes through the arc-shaped adjustment hole 5 and the connecting hole 20, and the curvature adjustment knob 6 is screwed onto the bolt.

[0017] As another preferred embodiment, the wall thickness pull plate 9 of this utility model is provided with a pull plate strip-shaped groove 21 along the length of the wall thickness pull plate 9 in the middle. A pull plate upper end head 24 is provided on the inner side of the upper end of the wall thickness pull plate 9. The outer side of the lower end of the pull plate upper end head 24 is connected to the upper inner end of the pull plate inclined surface 22. A pull plate limiting groove 23 is provided on the wall thickness pull plate 9 below the lower outer end of the pull plate inclined surface 22. The pull plate limiting groove 23 is located above the pull plate strip-shaped groove 21. A pull plate spring retaining groove 25 is provided on the wall thickness pull plate 9 below the pull plate strip-shaped groove 21 and on the inner side.

[0018] The adjusting support plate 12 has a support plate strip-shaped groove 28 along its length in the middle. The upper inner side of the adjusting support plate 12 has a support plate upper end head 29. The lower outer side of the support plate upper end head 29 is connected to the inner upper end of the support plate inclined surface 26. The adjusting support plate 12 below the lower outer end of the support plate inclined surface 26 has a support plate limiting groove 27, which is located above the support plate strip-shaped groove 28. The adjusting support plate 12 below the support plate strip-shaped groove 28 and near the inner side has a support plate spring retaining groove 30.

[0019] One end of spring 10 is hooked into the pull plate spring slot 25, and the other end of spring 10 is hooked into the support plate spring slot 30.

[0020] The cantilever plate 11 is provided with a wall thickness adjustment threaded hole 31 and a positioning threaded hole 32 along the transverse direction.

[0021] The wall thickness adjustment knob 13 is a bolt with a bolt head and a handle. The bolt passes through the support plate strip groove 28 and is screwed into the wall thickness adjustment threaded hole 31.

[0022] The positioning knob 8 is a bolt with a bolt head and a handle. The bolt passes through the strip-shaped slot 21 of the pull plate and is screwed into the positioning threaded hole 32.

[0023] As another preferred option, the protective shell 1 of this utility model is made of stainless steel.

[0024] Secondly, the thickness of the wall thickness pull plate 9 and the adjusting support plate 12 described in this utility model is 1mm to 1.2mm.

[0025] In addition, the width of the hanging plate 15 described in this utility model is greater than 50mm.

[0026] The beneficial effects of this utility model.

[0027] This invention employs a hanging plate 15, a cantilever plate 11, and a protective shell 1, which are attached to the workpiece 14. The tightness of the attachment is adjusted by a wall thickness pull plate 9 and an adjusting support plate 12. An inlet pipe 3 connects to an argon gas output end, and argon gas is directed from the opening at the top of the protective shell 1 towards the welding position of the workpiece 14. During welding, the welder can push the device to move with the welding position, allowing one person to control the argon gas flow while simultaneously completing the welding. No dedicated person is needed to handle the argon gas flow; one person can operate the device to complete the argon arc welding. Furthermore, this invention directs the argon gas towards the welding position of the workpiece 14, eliminating the need for the existing method of completely replacing air with internal pressure, thus saving gas and labor costs. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0029] Figure 1 This is a schematic diagram of the structure of this utility model.

[0030] Figure 2 This is a schematic diagram of the cantilever plate structure of this utility model.

[0031] Figure 3 This is a schematic diagram of the wall thickness pull plate structure of this utility model.

[0032] Figure 4 This is a schematic diagram of the adjustable support plate structure of this utility model.

[0033] Figure 5 This is a schematic diagram of the protective shell of this utility model in its unfolded state.

[0034] Figure 6 This is a schematic diagram of the folding process of the protective shell of this utility model.

[0035] Figure 7 This is a cross-sectional structural diagram of the protective shell of this utility model.

[0036] Figure 8 , 9 This is a schematic diagram of the structure of this utility model disposed between two welded parts.

[0037] Figure 10 This is a schematic diagram of the protective shell structure of this utility model.

[0038] In the diagram, 1 is the protective shell, 2 is the transverse partition, 3 is the air intake pipe, 4 is the connecting plate, 5 is the arc-shaped adjustment hole, 6 is the curvature adjustment knob, 7 is the positioning pin, 8 is the positioning knob, 9 is the wall thickness pull plate, 10 is the spring, 11 is the curvature adjustment cantilever plate, 12 is the adjustment support plate, 13 is the wall thickness adjustment knob, 14 is the weldment, 15 is the hanging plate, 16 is the through hole, 17 is the limiting block, 18 is the support plate, 19 is the second positioning pin hole, 20 is the connecting hole, 21 is the pull plate strip groove, 22 is the pull plate bevel, and 23 is the pull plate limiting groove. 24 is the upper end of the pull plate, 25 is the pull plate spring slot, 26 is the inclined surface of the support plate, 27 is the support plate limiting groove, 28 is the support plate strip groove, 29 is the upper end of the support plate, 30 is the support plate spring slot, 31 is the wall thickness adjustment threaded hole, 32 is the positioning threaded hole, 33 is the horizontal strip groove, 34 is the inner wall, 35 is the wall thickness, 36 is the outer wall, 37 is the bevel, 38 is the isosceles trapezoidal plate, 39 is the horizontal rectangular plate, 40 is the right-angled trapezoidal plate, 41 is the rectangular plate, 42 is the upper position of the intersection, and 43 is the hole for installing rivets. Detailed Implementation

[0039] As shown in the figure, this utility model includes a protective shell 1 with an open top. An air inlet pipe 3 is provided on the protective shell 1. One side of the protective shell 1 is connected to one side of a connecting plate 4, and the other side of the connecting plate 4 is connected to one side of a cantilever plate 11. A wall thickness pull plate 9 and an adjusting support plate 12 are movably connected to the cantilever plate 11. The wall thickness pull plate 9 and the adjusting support plate 12 are arranged in a transverse direction. The wall thickness pull plate 9 and the adjusting support plate 12 can move up and down and back and forth relative to the cantilever plate 11 and can be locked and positioned. A hanging plate 15 is provided on the upper end of the wall thickness pull plate 9 and the adjusting support plate 12. The upper end of the wall thickness pull plate 9 and the adjusting support plate 12 is placed in the horizontal strip groove 33 on the hanging plate 15.

[0040] A transverse partition 2 is provided in the middle of the inner part of the protective shell 1. A through hole 16 is provided on the transverse partition 2, and an air inlet pipe 3 is located at the lower end of the protective shell 1. The protective shell 1 is divided into two chambers (e.g., Figure 1 , 10As shown), there is a horizontal partition 2 in the middle, and a through hole 16 is provided on the horizontal partition 2, which can evenly distribute, disperse and slow down the gas rushed in by the air inlet pipe 3, so as to avoid direct impact on the welding arc and cause welding defects.

[0041] Experiments revealed that when the diaphragm 2 is located near the open side (i.e., the upper part of the protective shell 1), it is easily burned by the electric arc during welding. If the diaphragm 2 is located near the other side (i.e., the lower part of the protective shell 1), the gas entering through the air inlet pipe 3 may not be evenly distributed throughout the space, resulting in excessively rapid local airflow, which affects the welding arc and causes welding defects. Therefore, the diaphragm 2 is best positioned in the middle of the protective shell 1.

[0042] The air intake pipe 3 is located at the lower end of the protective shell, near the connecting plate 4. The air intake pipe 3 is not located in the center of the protective shell 1, but near the connecting plate 4; the air intake pipe 3 is shortened from the right end of the cantilever plate 11 (e.g., Figure 1 The lever arm length formed by the fulcrum (i.e., support plate 18) is shown to reduce friction during movement.

[0043] The through holes 16 are multiple and are evenly distributed on the transverse partition 2.

[0044] The cross-sectional area of ​​a single through-hole 16 is smaller than the cross-sectional area of ​​the inner diameter of the intake pipe 3, and the total cross-sectional area of ​​multiple through-holes 16 is not less than the cross-sectional area of ​​the inner diameter of the intake pipe 3; this achieves the effect of dispersing airflow and reducing the intake airflow velocity. The attached diagram is for illustrative purposes only. To make the holes visually clear, the ratio of the cross-sectional area of ​​the through-hole 16 to the cross-sectional area of ​​the inner diameter of the intake pipe 3 is based on the text.

[0045] The lower end of the cantilever plate 11 has a plurality of forward-extending limiting blocks 17.

[0046] There are three limiting blocks 17: one limiting block 17 is provided at the front end of the cantilever plate 11, one limiting block 17 is provided at the front part of the cantilever plate 11, and one limiting block 17 is provided at the middle part of the cantilever plate 11.

[0047] The limiting block 17 is made of bent sheet metal.

[0048] like Figure 2 As shown, the two limiting blocks 17 on the left (i.e., the front limiting block 17 and the front limiting block 17, with the adjusting support plate 12 placed between the front limiting block 17 and the front limiting block 17) can restrict the adjusting support plate 12 from swinging left and right, and can only adjust the adjusting support plate 12 up and down by tightening and loosening the wall thickness adjusting knob 13.

[0049] The middle limiting block 17 ensures that the wall thickness pull plate 9 can only rotate clockwise after installation, and the upper left end of the wall thickness pull plate 9 is locked at the left end of the horizontal strip groove 33. Figure 1As shown. When this utility model needs to be installed, press down on the hanging plate 15 or press the upper end of the wall thickness pull plate 9 towards the adjusting support plate 12. The wall thickness pull plate 9 rotates clockwise, and the upper end of the wall thickness pull plate 9 can enter the horizontal strip groove 33. The spring 15 is in a stretched state, so that the upper ends of the wall thickness pull plate 9 and the adjusting support plate 12 are locked in the horizontal strip groove 33. When this utility model needs to be disassembled, press down on the upper end of the wall thickness pull plate 9 towards the adjusting support plate 12, that is, the wall thickness pull plate 9 rotates clockwise, and lift up the hanging plate 15 to separate the hanging plate 15 from the wall thickness pull plate 9.

[0050] The upper end of the cantilever plate 11 has an upwardly extending and backwardly bent support plate 18. The fulcrum (support plate 18) of the cantilever plate 11 is used to support the inner wall 34 of the weldment 14.

[0051] The support plate 18 is located at the front end of the cantilever plate 11. The support plate 18 rests against the inner wall 34 of the weldment 14. The wall thickness pull plate 9 is hung on the hanging plate 15 by a horizontal lever together with the curvature adjustment cantilever plate 11 and the protective shell 1 through the positioning knob 8, so that the opening side of the protective shell 1 is in contact with the inner wall 34 of the weldment 14.

[0052] The connecting plate 4 is a horizontal L-shaped plate. The short horizontal plate of the horizontal L-shaped plate is connected to the protective shell 1 (the short horizontal plate of the horizontal L-shaped plate and the protective shell 1 can be connected by rivets). The long horizontal plate of the horizontal L-shaped plate is provided with a first positioning pin hole on the upper outer side, and the long horizontal plate of the horizontal L-shaped plate is provided with an arc-shaped adjustment hole 5 on the lower outer side.

[0053] The upper part of the cantilever plate 11 near the connecting plate 4 is provided with a second positioning pin hole 19 corresponding to the first positioning pin hole, and the lower part of the cantilever plate 11 near the connecting plate 4 is provided with a connecting hole 20 corresponding to the arc-shaped adjustment hole 5.

[0054] The positioning pin 7 passes through the first positioning pin hole and the second positioning pin hole 19;

[0055] The bolt passes through the arc-shaped adjustment hole 5 and the connecting hole 20, and the curvature adjustment knob 6 is screwed onto the bolt. The curvature adjustment knob 6 can be a nut with a handle.

[0056] Adjust the angle between the cantilever plate 11 and the protective shell 1 to make the protective shell 1 fit against the inner wall 34 of the weldment 14, and then tighten the curvature adjustment knob 6. Because the curvature of the inner wall 34 of the weldment 14 is not fixed, some have large diameters, some have small diameters, and some are straight.

[0057] The positioning pin 7 can be a bolt assembly, and a spring washer can be set to maintain a certain degree of tightness for rotation.

[0058] The connecting plate 4 has an arc-shaped adjustment hole 5, which is used to adjust the angle formed by the cantilever plate 11 and the protective shell 1, so that the curvature of the arc formed by the two sides of the upper end of the protective shell 1 and the fulcrum of the cantilever plate 11 (i.e., the upper end of the support plate 18) is equal to the curvature of the inner wall 34 of the weldment 14, that is, the left side of the cantilever plate 11 ( Figure 1 The device can rotate around the positioning pin 7. The arc-shaped adjustment hole 5 corresponds to the rotation trajectory of the curvature adjustment knob 6. After adjustment, tighten the curvature adjustment knob 6. Adjust the pull plate 9 to make the upper end of the protective shell 1 fit against the inner wall 34 of the weldment 14, so as to suit the welding of the annular weld of weldment 14 with different diameters.

[0059] The thick-walled pull plate 9 has a pull plate strip-shaped groove 21 along its length in the middle. The upper inner side of the thick-walled pull plate 9 has a pull plate upper end head 24. The lower outer side of the pull plate upper end head 24 is connected to the upper inner side of the pull plate inclined surface 22. A pull plate limiting groove 23 is provided on the thick-walled pull plate 9 below the lower outer side of the pull plate inclined surface 22. The pull plate limiting groove 23 is located above the pull plate strip-shaped groove 21. A pull plate spring retaining groove 25 is provided on the thick-walled pull plate 9 below the pull plate strip-shaped groove 21 and on the inner side.

[0060] The adjusting support plate 12 has a support plate strip-shaped groove 28 along its length in the middle. The upper inner side of the adjusting support plate 12 has a support plate upper end head 29. The lower outer side of the support plate upper end head 29 is connected to the inner upper end of the support plate inclined surface 26. The adjusting support plate 12 below the lower outer end of the support plate inclined surface 26 has a support plate limiting groove 27, which is located above the support plate strip-shaped groove 28. The adjusting support plate 12 below the support plate strip-shaped groove 28 and near the inner side has a support plate spring retaining groove 30.

[0061] One end of spring 10 is hooked into the pull plate spring slot 25, and the other end of spring 10 is hooked into the support plate spring slot 30.

[0062] The cantilever plate 11 is provided with a wall thickness adjustment threaded hole 31 and a positioning threaded hole 32 along the transverse direction.

[0063] The wall thickness adjustment knob 13 is a bolt with a bolt head and a handle. The bolt passes through the support plate strip groove 28 and is screwed into the wall thickness adjustment threaded hole 31.

[0064] The positioning knob 8 is a bolt with a bolt head and a handle. The bolt passes through the strip-shaped slot 21 of the pull plate and is screwed into the positioning threaded hole 32.

[0065] The wall thickness pull plate 9 has a strip-shaped groove 21, which can adjust the up and down position of the cantilever plate 11 according to the wall thickness 35 and curvature of the weldment 14, so that the upper end of the device fits against the inner wall 34 of the weldment 14.

[0066] The upper part of the wall thickness pull plate 9 and the adjusting support plate 12 has a pull plate slope 22 and a support plate slope 26. During installation, the spring 10 can be stretched by pressing the hanging plate 15 and slide into the limiting groove 23 to hang the device on the weldment 14.

[0067] The protective shell 1 is made of stainless steel. The protective shell 1 can be made of thin stainless steel sheet material, meeting the requirements of many industries for non-polluting non-ferrous metals.

[0068] The thickness of the wall thickness tie plate 9 and the adjusting support plate 12 is 1mm to 1.2mm. The weld gap in argon arc welding is generally reserved to be 1.5mm to 3mm. The 1mm to 1.2mm thick wall thickness tie plate 9 and adjusting support plate 12 can smoothly pass through the reserved gap between the two welded parts 14 (e.g., Figure 8 , 9 As shown in the figure, it is convenient to move the protective shell 1 during the welding process.

[0069] The width of the hanging plate 15 is greater than 50mm. The width of the hanging plate 15 is greater than 50mm to ensure that the hanging plate 15 will not fall into the bevel 37 of the weldment 14. The length of the horizontal groove 33 needs to ensure that the spring 10 between the wall thickness pull plate 9 and the adjusting support plate 12 is in a stretched state (the stretched state keeps the upper ends of the wall thickness pull plate 9 and the adjusting support plate 12 tilted outwards, and the pull plate limiting groove 23 and the support plate limiting groove 27 will not come out of the horizontal groove 33), to ensure that the device does not fall off.

[0070] like Figure 5 , 6 As shown, the protective shell 1 can be made by folding a single thin plate. The thin plate includes a horizontal rectangular plate 39, with isosceles trapezoidal plates 38 extending outward from the left front and rear ends of the horizontal rectangular plate 39, and rectangular plates 41 extending outward from the right front and rear ends of the horizontal rectangular plate 39. Right-angled trapezoidal plates 40 extending outward are located on the horizontal rectangular plates 39 on both sides of the rectangular plate 41. The long base of the isosceles trapezoidal plate 38 is a bent edge. The line connecting the left ends of the two isosceles trapezoidal plates 38 is a bent edge. The line connecting the right ends of the two isosceles trapezoidal plates 38 is a bent edge. The line connecting the left ends of the two right-angled trapezoidal plates 40 on the left is a bent edge. The line connecting the right ends of the two right-angled trapezoidal plates 40 on the right is a bent edge. The bottom edge of the right-angled trapezoidal plate 40 is a bent edge. The inner side of the rectangular plate 41 is a bent edge. The through hole 16 is located on the left side of the horizontal rectangular plate 39, and the air intake pipe 3 is located on the right side of the horizontal rectangular plate 39. The protective shell is made by folding a single thin sheet of material, which is easy to manufacture and has a low cost.

[0071] Holes for installing rivets can be provided at both ends of the horizontal rectangular plate 39, both ends of the rectangular plate 41, and both sides of the right-angled trapezoidal plate 40 to facilitate connection after folding.

[0072] The working process of this utility model will be described below with reference to the accompanying drawings.

[0073] Two welded parts, 14 Figure 8 , 9As shown, the upper ends of the wall thickness pull plate 9 and the adjusting support plate 12 pass through the gap between the two welded parts 14 and are positioned above them. The hanging plate 15 is pressed down from above, causing the upper ends of the wall thickness pull plate 9 and the adjusting support plate 12 to enter the horizontal groove 33. The spring 15 is in a stretched state, and the lower end of the hanging plate 15 connects to the outer wall 36 of the two welded parts 14. The device is thus hung between the two welded parts 14.

[0074] Make the upper end of the protective shell 1 attach to the inner wall 34 of the weldment 14, and adjust the cantilever plate 11 so that the left end of the cantilever plate 11 is around the positioning pin 7 (e.g. Figure 1 As shown), place the upper end of the support plate 18 against the inner wall 34 of the weldment 14, and tighten the curvature adjustment knob 6.

[0075] Tightening the wall thickness adjustment knob 13 and the positioning knob 8 is equivalent to the device being clamped onto the wall thickness 35 of the weldment 14 via the hanging plate 15, the upper end of the protective shell 1 and the upper end of the support plate 18. At the same time, it can maintain an appropriate gap between the upper end of the protective shell 1 and the upper end of the support plate 18 and the inner wall 34 of the weldment 14, so that the device can be pushed laterally.

[0076] The welding process involves welding the upper part 42 (the junction of bevel 37 and groove 14) of the two weldments. Figure 8 The image is only for illustrative purposes; in actual operation, welding should be performed sequentially following the positions corresponding to the openings at the top of the protective casing 1. Figure 8 As shown.

[0077] During welding, a gap of 2mm to 4mm must be maintained between the two weldment parts 14 for welding to proceed. The wall thickness tie plate 9 and the adjusting support plate 12 are sandwiched between the two weldment parts 14 and will not affect the welding. Only plates with a thickness of 1mm to 3mm are welded without gaps, such as stovetops and washbasins. This utility model device is not for use in products with such thinner thicknesses, but rather in the boiler and vessel industry, where plates are thicker, generally 3mm or more, and the gaps are filled with welding material.

[0078] Positioning knob 8 and wall thickness adjustment knob 13 are located below the two welded parts 14, as shown. Figure 9 As shown.

[0079] When welding straight seams, the connecting plate 4 is parallel to the cantilever plate 11, and the upper end of the protective shell 1 is on the same plane as the upper end of the support plate 18.

[0080] In use, it can be operated by a single person, who can push and adjust the end of the support plate 12 while welding, and the moving device can achieve continuous welding protection. The welding torch is positioned above the upper end 42 of the junction of the bevels 37 of the two weldments 14 (i.e., above the weld seam, such as...). Figure 8 (As shown).

[0081] Although the device of this invention needs to move along the welding position during use, it requires a certain amount of friction to maintain contact with the workpiece 14. This is because during welding, the weld joint is sometimes tilted, especially at circumferential weld joints; if the friction is too small, it is prone to slippage and instability. Therefore, it is unnecessary to provide sliding structures (such as ball bearings) at the contact points between the upper end of the protective shell 1 and the inner wall 34 of the workpiece 14, the lower end of the hanging plate and the outer wall 36 of the workpiece 14, and the upper end of the support plate 18 and the inner wall 34 of the workpiece 14.

[0082] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. A welding argon gas protection device, comprising a protective shell (1) with an open top, characterized in that... An air inlet pipe (3) is provided on the protective shell (1). One side of the protective shell (1) is connected to one side of the connecting plate (4), and the other side of the connecting plate (4) is connected to one side of the cantilever plate (11). A wall thickness pull plate (9) and an adjusting support plate (12) are movably connected on the cantilever plate (11). The wall thickness pull plate (9) and the adjusting support plate (12) are arranged in the transverse direction. The wall thickness pull plate (9) and the adjusting support plate (12) can move up and down and back and forth relative to the cantilever plate (11) and can be locked and positioned. A hanging plate (15) is provided on the upper end of the wall thickness pull plate (9) and the adjusting support plate (12). The upper end of the wall thickness pull plate (9) and the adjusting support plate (12) is placed in the horizontal groove (33) on the hanging plate (15).

2. The welding argon gas protection device according to claim 1, characterized in that... A transverse partition (2) is provided in the middle of the inner part of the protective shell (1), and a through hole (16) is provided on the transverse partition (2). An air inlet pipe (3) is provided at the lower end of the protective shell (1).

3. The welding argon gas protection device according to claim 1, characterized in that... The air intake pipe (3) is located at the lower end of the protective shell near the connecting plate (4).

4. The welding argon gas protection device according to claim 2, characterized in that... The through holes (16) are multiple and are evenly distributed on the transverse partition (2).

5. The welding argon gas protection device according to claim 4, characterized in that... The cross-sectional area of ​​a single through hole (16) is smaller than the cross-sectional area of ​​the inner diameter of the air intake pipe (3), and the total cross-sectional area of ​​multiple through holes (16) is not less than the cross-sectional area of ​​the inner diameter of the air intake pipe (3).

6. The welding argon gas protection device according to claim 1, characterized in that... The lower end of the cantilever plate (11) has a plurality of forward-extending limiting blocks (17).

7. The welding argon gas protection device according to claim 6, characterized in that... There are three limiting blocks (17): one limiting block (17) is set at the front end of the cantilever plate (11), one limiting block (17) is set at the front part of the cantilever plate (11), and one limiting block (17) is set at the middle part of the cantilever plate (11).

8. The welding argon gas protection device according to claim 1, characterized in that... The upper end of the cantilever plate (11) has a support plate (18) that extends upward and bends backward.

9. The welding argon gas protection device according to claim 1, characterized in that... The connecting plate (4) is a horizontal L-shaped plate. The short horizontal plate of the horizontal L-shaped plate is connected to the protective shell (1). The upper outer part of the long horizontal plate of the horizontal L-shaped plate is provided with a first positioning pin hole, and the lower outer part of the long horizontal plate of the horizontal L-shaped plate is provided with an arc-shaped adjustment hole (5). The upper part of the cantilever plate (11) near the connecting plate (4) is provided with a second positioning pin hole (19) corresponding to the first positioning pin hole, and the lower part of the cantilever plate (11) near the connecting plate (4) is provided with a connecting hole (20) corresponding to the arc-shaped adjustment hole (5). The positioning pin (7) passes through the first positioning pin hole and the second positioning pin hole (19); The bolt passes through the arc-shaped adjustment hole (5) and the connecting hole (20), and the curvature adjustment knob (6) is screwed onto the bolt.

10. The welding argon gas protection device according to claim 1, characterized in that... The thick-walled pull plate (9) has a pull plate strip groove (21) along its length in the middle. The upper inner side of the thick-walled pull plate (9) has a pull plate upper end head (24). The lower outer side of the pull plate upper end head (24) is connected to the upper inner side of the pull plate inclined surface (22). A pull plate limiting groove (23) is provided on the thick-walled pull plate (9) below the lower outer side of the pull plate inclined surface (22). The pull plate limiting groove (23) is located above the pull plate strip groove (21). A pull plate spring slot (25) is provided on the thick-walled pull plate (9) below the pull plate strip groove (21) and near the inner side. The adjusting support plate (12) has a support plate strip groove (28) in the middle along the length of the adjusting support plate (12). The upper inner side of the upper end of the adjusting support plate (12) is provided with a support plate upper end head (29). The lower outer side of the upper end head (29) is connected to the upper inner end of the inclined surface (26) of the support plate. The adjusting support plate (12) below the lower outer end of the inclined surface (26) of the support plate is provided with a support plate limiting groove (27). The support plate limiting groove (27) is located above the support plate strip groove (28). The adjusting support plate (12) below the support plate strip groove (28) and near the inner side is provided with a support plate spring slot (30). One end of the spring (10) is hooked into the pull plate spring slot (25), and the other end of the spring (10) is hooked into the support plate spring slot (30); The cantilever plate (11) is provided with a wall thickness adjustment threaded hole (31) and a positioning threaded hole (32) along the horizontal direction. The wall thickness adjustment knob (13) is a bolt with a bolt head and a handle. The bolt passes through the support plate slot (28) and is screwed into the wall thickness adjustment threaded hole (31). The positioning knob (8) is a bolt with a bolt head and a handle. The bolt passes through the pull plate strip groove (21) and is screwed into the positioning threaded hole (32).

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