Telescopic protective cover for reverse side of argon tungsten-arc welding groove

Abstract

The invention relates to the technical field of argon tungsten-arc welding protection covers, in particular to a telescopic protection cover for the reverse side of an argon tungsten-arc welding groove, which comprises a protection cover main body, the upper surface of the protection cover main body is fixedly connected with a first sealing edge strip, and the interior of the protection cover main body is slidably connected with an expansion cover; the bottom of the protection cover main body is provided with a supporting mechanism for conveniently supporting the protection cover main body and the extension cover, and an adjusting mechanism for conveniently adjusting and locking the extension length is arranged between the protection cover main body and the extension cover. According to the telescopic protection cover for the reverse side of the tungsten electrode argon arc welding groove, an expansion cover is slidably connected into a protection cover body, a first sealing edge strip and a second sealing edge strip are arranged on the upper surface of the protection cover body and the upper surface of the expansion cover correspondingly, and the second sealing edge strip is slidably connected into a sliding groove formed in the first sealing edge strip; therefore, the protection cover main body and the expansion cover can be attached and sealed with the welding test piece.

Description

Technical Field

[0001] The invention relates to the technical field of tungsten inert gas arc welding protective covers, in particular to a telescopic protective cover used for the reverse side of a tungsten inert gas arc welding groove. Background Art

[0002] Tungsten inert gas welding uses argon to protect the welding arc. This welding method has the characteristics of good welding quality and strong adaptability. It can be used for welding the base weld of various metal butt joints. The argon gas sprayed by the welding gun can protect the front of the weld, but the back of the weld also needs argon protection to prevent the weld area from being affected by oxidation and other impurities, reduce the occurrence of welding defects, and improve the mechanical properties of the welded joint. When welding pipes, argon can be introduced into the pipe to achieve the purpose of protecting the back side; when welding plates, an argon protection device needs to be installed on the back side.

[0003] The prior art does not have a structure in which the length of the tungsten inert gas arc welding protective cover is adjustable and the protective cover is tightly supported when in use, so that the existing tungsten inert gas arc welding protective cover, when in use, mostly adopts an integrated protective cover, and a gas valve is respectively arranged on the left and right sides of the protective cover for argon gas to enter and exit. However, since the length of the welding test plate cannot be determined, a protective cover of a single size cannot provide argon gas protection for a longer or shorter welding test plate. At the same time, when the existing protective cover is fixed to the test plate, the protective cover needs to be placed at the bottom of the test plate due to the limitation of the welding surface. If the test plate is suspended when the bottom is supported and fixed, it is difficult for the protective cover to be tightly attached to the bottom of the test plate, which is inconvenient to use. Based on the deficiencies of the prior art, the present invention designs a retractable protective cover for the reverse side of the tungsten inert gas arc welding groove. Summary of the invention

[0004] The invention provides a retractable protective cover for the reverse side of a tungsten inert gas arc welding groove, which has the advantages that the length of the tungsten inert gas arc welding protective cover is adjustable and the protective cover is supported tightly.

[0005] The present invention provides the following technical solution: a retractable protective cover for the reverse side of a tungsten inert gas arc welding groove, comprising a protective cover body, a first sealing edge strip being fixedly connected to the upper surface of the protective cover body, a slide groove being provided on the upper surface of the first sealing edge strip, an extension cover being slidably connected to the interior of the protective cover body, a second sealing edge strip being fixedly connected to the upper surface of the extension cover, a supporting mechanism for supporting the protective cover body and the extension cover being provided at the bottom of the protective cover body, and an adjusting mechanism for adjusting and locking the extension length being provided between the protective cover body and the extension cover;

[0006] The adjusting mechanism comprises a threaded block, an adjusting screw, a screw head, a limit plate, a rubber damping ring, a limit slide rod and a stop column. The threaded block is fixedly connected to the bottom of the inner cavity of the extension cover, the adjusting screw thread is connected to the inside of the threaded block, the screw head is fixedly connected to the outer end of the adjusting screw, the limit plate is fixedly connected to one side of the inner wall of the extension cover, the rubber damping ring is fixedly connected to the inside of the limit plate, the limit slide rod is slidably inserted into the inside of the rubber damping ring, and the stop column is fixedly connected to the inner end of the limit slide rod.

[0007] As a preferred technical solution of the present invention, the support mechanism includes a support arm, a first fixed plate, a side arm, a second fixed plate, a first hinge block, a telescopic rod, a locking bolt, a second hinge block, an adjusting nut, an adjusting screw, a rubber grip, a support seat and a rotating seat, the support arm is fixedly connected to the lower surface of the protective cover body, the first fixed plate is fixedly connected to the top end of the support arm, the side arm is fixedly connected to the side wall of the support arm, the second fixed plate is fixedly connected to the top end of the side arm, the first hinge block is fixedly connected to the side of the support arm away from the side arm, the bottom end of the telescopic rod is rotatably connected to the inside of the first hinge block, the locking bolt is rotatably connected to the side wall of the telescopic rod, the second hinge block is fixedly connected to the lower surface of the expansion cover, the adjusting nut is fixedly connected to the lower surface of the support arm, the adjusting screw is threadedly connected to the inside of the adjusting nut, the rubber grip is fixedly connected to the side wall of the bottom end of the adjusting screw, the rotating seat is rotatably connected to the bottom end of the adjusting screw, and the support seat is fixedly connected to the lower surface of the rotating seat.

[0008] As a preferred technical solution of the present invention, an air intake valve is fixedly connected to one side of the protective cover body.

[0009] As a preferred technical solution of the present invention, an exhaust valve is fixedly connected to one side of the expansion cover.

[0010] As a preferred technical solution of the present invention, the outer end of the adjusting screw is rotatably connected to one side of the protective cover body.

[0011] As a preferred technical solution of the present invention, the limiting sliding rod is fixedly connected to the inner wall of the protective cover body, and the limiting sliding rod penetrates and is slidably inserted into the interior of the limiting plate.

[0012] As a preferred technical solution of the present invention, the first fixing plate is fixedly connected to the lower surface of the protection cover body, and the second fixing plate is fixedly connected to the lower surface of the protection cover body.

[0013] As a preferred technical solution of the present invention, the inner end of the locking bolt contacts the telescopic end surface of the telescopic rod, and the top end of the telescopic rod is rotatably connected to the inside of the second hinge block.

[0014] As a preferred technical solution of the present invention, the adjusting screw is threadedly lifted and lowered inside the supporting arm.

[0015] As a preferred technical solution of the present invention, the inner cavities of the extension cover and the protection cover body are connected, the second sealing edge strip is slidably connected to the inner side of the first sealing edge strip, and the second sealing edge strip is sealingly fitted with the first sealing edge strip.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. A retractable protective cover for the reverse side of the groove of tungsten inert gas arc welding is arranged by aligning and fixing the welding specimen, and then twisting the screw head forward or backward to drive the adjusting screw to rotate inside the threaded block. The forward or backward rotating adjusting screw pulls the threaded block to move left or right, and drives the extension cover connected thereto to move accordingly under the limitation of the limiting plate, the rubber damping ring and the limiting slide rod, until the combined length of the protective cover body and the extension cover after expansion is the same as the welding port length of the welding specimen. At this time, the height of the protective cover body and the extension cover is adjusted by the supporting mechanism, so that the first sealing edge strip and the second sealing edge strip fixedly connected to the upper surface of the protective cover body and the extension cover are tightly fitted with the bottom of the welding specimen. Finally, the argon hose is connected to the intake valve and the exhaust hose is connected to the exhaust valve, and ventilation is carried out for welding. The device is convenient for argon welding protection of welding specimens of different sizes.

[0018] 2. A telescopic protective cover for the reverse side of a tungsten inert gas arc welding groove. Before adjusting the extension length of the protective cover body and the extension cover, first reversely twist the locking bolt to unlock the main body and the telescopic end of the telescopic rod, then adjust the position of the extension cover left and right, and pull the top of the telescopic rod hinged to it to extend or contract. After the position of the extension cover is adjusted, retighten the locking bolt to lock the length of the telescopic rod to complete the support of the protective cover body and the extension cover. At this time, place the protective cover body and the extension cover under the welding specimen, hold the support arm with one hand to prevent it from rotating, and then hold the rubber grip ring with the other hand to drive the adjusting screw to rotate. The rotating adjusting screw uses the adjusting nut to push the support arm, the protective cover body and the extension cover upward until the first sealing edge strip and the second sealing edge strip provided on the upper surface of the protective cover body and the extension cover are in contact with the lower surface of the welding specimen. The device facilitates the protective cover body and the extension cover to be in contact with the bottom of the welding specimen. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the main structure of the protective cover of the present invention;

[0021] Figure 3It is a schematic diagram of the connection structure between the protection cover and the expansion cover of the present invention;

[0022] Figure 4 It is a bottom view structural schematic diagram of the support mechanism of the present invention;

[0023] Figure 5 It is a schematic diagram of the expanded structure of the protective cover, the expansion cover and the supporting mechanism of the present invention;

[0024] Figure 6 It is a schematic diagram of the adjustment and structural structure of the present invention;

[0025] Figure 7 It is a schematic cross-sectional view of the connection structure of the protection cover, the expansion cover and the adjustment mechanism of the present invention.

[0026] In the figure: 1. Protective cover body; 101. First sealing edge strip; 102. Slide groove; 103. Inlet valve; 2. Extension cover; 201. Second sealing edge strip; 202. Exhaust valve; 3. Support mechanism; 301. Support arm; 302. First fixed plate; 303. Side arm; 304. Second fixed plate; 305. First hinge block; 306. Telescopic rod; 307. Locking bolt; 308. Second hinge block; 309. Adjusting nut; 310. Adjusting screw; 311. Rubber grip ring; 312. Support seat; 313. Rotating seat; 4. Adjusting mechanism; 401. Threaded block; 402. Adjusting screw; 403. Screw head; 404. Limiting plate; 405. Rubber damping ring; 406. Limiting slide rod; 407. Stop column. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-7A retractable protective cover for the reverse side of a tungsten inert gas arc welding groove comprises a protective cover body 1, a first sealing edge strip 101 is fixedly connected to the upper surface of the protective cover body 1, a slide groove 102 is provided on the upper surface of the first sealing edge strip 101, an extension cover 2 is slidably connected to the inside of the protective cover body 1, a second sealing edge strip 201 is fixedly connected to the upper surface of the extension cover 2, a supporting mechanism 3 for supporting the protective cover body 1 and the extension cover 2 is provided at the bottom of the protective cover body 1, an adjusting mechanism 4 for adjusting and locking the extension length is provided between the protective cover body 1 and the extension cover 2, an intake valve 103 is fixedly connected to one side of the protective cover body 1, an exhaust valve 202 is fixedly connected to one side of the extension cover 2, the inner cavities of the extension cover 2 and the protective cover body 1 are communicated, the second sealing edge strip 201 is slidably connected to the inner side of the first sealing edge strip 101, and the second sealing edge strip 201 is sealed and fitted with the first sealing edge strip 101.

[0029] By providing the protective cover main body 1 and the extended cover 2, the combined length of the protective cover main body 1 and the extended cover 2 can be adjusted according to the required welding length of the welding specimen, thereby improving flexibility and applicability while reducing argon consumption. By providing the first sealing edge strip 101, the slide groove 102 and the second sealing edge strip 201, the sides of the first sealing edge strip 101 and the second sealing edge strip 201 can be tightly fitted, and there will be no leakage after the first sealing edge strip 101 and the second sealing edge strip 201 are fitted to the bottom of the welding specimen.

[0030] See also Figure 6-7 , adjusting mechanism 4, the adjusting mechanism 4 includes a threaded block 401, an adjusting screw 402, a screw head 403, a limiting plate 404, a rubber damping ring 405, a limiting slide rod 406 and a blocking column 407. The threaded block 401 is fixedly connected to the bottom of the inner cavity of the extension cover 2, the adjusting screw 402 is threadedly connected to the inside of the threaded block 401, the screw head 403 is fixedly connected to the outer end of the adjusting screw 402, the limiting plate 404 is fixedly connected to one side of the inner wall of the extension cover 2, the rubber damping ring 405 is fixedly connected to the inside of the limiting plate 404, the limiting slide rod 406 is inserted into the inside of the rubber damping ring 405 for sliding, the blocking column 407 is fixedly connected to the inner end of the limiting slide rod 406, the outer end of the adjusting screw 402 is inserted into and rotatably connected to one side of the protective cover body 1, the limiting slide rod 406 is fixedly connected to the inner wall of the protective cover body 1, and the limiting slide rod 406 is inserted into the inside of the limiting plate 404 for sliding.

[0031] By setting a limit plate 404, a rubber damping ring 405 and a limit slide rod 406, the moving direction of the extension cover 2 in the protective cover body 1 can be limited to prevent the extension cover 2 from being offset at a slight angle during the movement, which may cause a gap between the extension cover 2 and the protective cover body 1 and cause air leakage. By setting a stop column 407, the maximum expansion value between the extension cover 2 and the protective cover body 1 can be limited. By setting a threaded block 401, an adjusting screw 402 and a screw head 403, the expansion values ​​of the protective cover body 1 and the extension cover 2 can be accurately adjusted, and the protective cover body 1 and the extension cover 2 can be auxiliary locked.

[0032] See also Figure 4-5 The support mechanism 3 includes a support arm 301, a first fixed plate 302, a side arm 303, a second fixed plate 304, a first hinge block 305, a telescopic rod 306, a locking bolt 307, a second hinge block 308, an adjusting nut 309, an adjusting screw rod 310, a rubber grip ring 311, a support seat 312 and a rotating seat 313. The support arm 301 is fixedly connected to the lower surface of the protective cover body 1, the first fixed plate 302 is fixedly connected to the top of the support arm 301, the side arm 303 is fixedly connected to the side wall of the support arm 301, the second fixed plate 304 is fixedly connected to the top of the side arm 303, the first hinge block 305 is fixedly connected to the side of the support arm 301 away from the side arm 303, the bottom end of the telescopic rod 306 is rotatably connected to the inside of the first hinge block 305, and the locking bolt 307 is rotatably connected to the telescopic rod The second hinge block 308 is fixedly connected to the lower surface of the extension cover 2, the adjusting nut 309 is fixedly connected to the lower surface of the support arm 301, the adjusting screw 310 is threadedly connected to the inside of the adjusting nut 309, the rubber grip ring 311 is fixedly connected to the side wall of the bottom end of the adjusting screw 310, the rotating seat 313 is rotatably connected to the bottom end of the adjusting screw 310, the support seat 312 is fixedly connected to the lower surface of the rotating seat 313, the first fixed plate 302 is fixedly connected to the lower surface of the protective cover body 1, the second fixed plate 304 is fixedly connected to the lower surface of the protective cover body 1, the inner end of the locking bolt 307 contacts the telescopic end surface of the telescopic rod 306, the top end of the telescopic rod 306 is rotatably connected to the inside of the second hinge block 308, and the adjusting screw 310 is threadedly lifted and lowered inside the support arm 301.

[0033] By providing a support arm 301, a first fixed plate 302, a side arm 303 and a second fixed plate 304, support is provided for the protective cover body 1 as a whole; by providing a first hinge block 305, a telescopic rod 306, a locking bolt 307 and a second hinge block 308, support is provided for the extension cover 2. During the adjustment process of the extension cover 2 moving left and right, the telescopic rod 306 can be telescopically changed in length to adapt to the extension cover 2 and provide support for it; by providing an adjusting nut 309, an adjusting screw rod 310, a rubber grip ring 311, a support seat 312 and a rotating seat 313, the use height of the protective cover body 1 and the extension cover 2 can be adjusted, so that the first sealing edge strip 101 and the second sealing edge strip 201 fixedly connected to the upper surface of the protective cover body 1 and the extension cover 2 are fitted with the bottom of the welding specimen.

[0034] Working principle: when a retractable protective cover for the reverse side of a tungsten inert gas arc welding groove is used, in the initial state, the extension cover 2 is first slidably connected to the inside of the protective cover body 1, and the first sealing edge strip 101 and the second sealing edge strip 201 are respectively arranged on the upper surfaces of the protective cover body 1 and the extension cover 2, and the second sealing edge strip 201 is slidably connected to the inside of the slide groove 102 opened on the first sealing edge strip 101, so that the protective cover body 1 and the extension cover 2 can fit and seal with the welding specimen, and the limiting slide rod 406 fixedly connected to the inner wall of the protective cover body 1 is slidably inserted into the inside of the limiting plate 404 and the rubber damping ring 405 fixedly connected to the inner wall of the extension cover 2, and the adjusting screw 402 rotatably connected on the protective cover body 1 is threadedly inserted in The inside of the threaded block 401 fixedly connected to the bottom of the inner cavity of the extension cover 2 is so as to accurately control the length of the protection cover body 1 and the extension cover 2 after expansion and lock it. At the same time, the side wall of the support arm 301 fixedly connected to the bottom of the protection cover body 1 is connected with a first hinge block 305, and the telescopic rod 306 rotating in the first hinge block 305 is hinged with the second hinge block 308 fixedly connected to the lower surface of the extension cover 2, and a locking bolt 307 is provided on the telescopic rod 306 to provide support for the extension cover 2 of any extended length. At the same time, the adjusting screw 310 threadedly connected by the adjusting nut 309 at the bottom of the support arm 301 is connected to the support seat 312 to adjust the use height of the protection cover body 1 and the extension cover 2 to fit closely with the bottom of the welding specimen;

[0035] When it is necessary to perform argon welding protection on welding specimens of different sizes, first align and fix the welding specimens, then turn the screw head 403 forward or reverse to drive the adjusting screw 402 to rotate inside the threaded block 401, and the adjusting screw 402 rotating forward or reverse pulls the threaded block 401 to move left or right, and drives the extended cover 2 connected thereto to move accordingly under the limitation of the limiting plate 404, the rubber damping ring 405 and the limiting slide bar 406, until the combined length of the protection cover body 1 and the extended cover 2 after expansion is the same as the welding port length of the welding specimen, at this time, use the supporting mechanism 3 to adjust the height of the protection cover body 1 and the extended cover 2, so that the first sealing edge strip 101 and the second sealing edge strip 201 fixedly connected to the upper surface of the protection cover body 1 and the extended cover 2 are tightly fitted with the bottom of the welding specimen, finally, connect the argon hose to the intake valve 103, the exhaust hose to the exhaust valve 202, and ventilate before welding, and the device is convenient for argon welding protection of welding specimens of different sizes.

[0036] When it is necessary to make the protective cover body 1 and the extension cover 2 fit with the bottom of the welding specimen, first, before adjusting the extension length of the protective cover body 1 and the extension cover 2, first reversely turn the locking bolt 307 to unlock the main body and the telescopic end of the telescopic rod 306, then adjust the position of the extension cover 2 left and right, and the second hinge block 308 fixedly connected to the bottom of the extension cover 2 pulls the top of the telescopic rod 306 hinged thereto to extend or contract, and after the position of the extension cover 2 is adjusted, retighten the locking bolt 307 to lock the length of the telescopic rod 306 to complete the support of the protective cover body 1 and the extension cover 2. At this time, place the protective cover body 1 and the extension cover 2 under the welding specimen, hold the support arm 301 with one hand to prevent it from rotating, and then hold the rubber grip ring 311 with the other hand to drive the adjusting screw 310 to rotate. The rotating adjusting screw 310 uses the adjusting nut 309 to push the support arm 301, the protective cover body 1 and the extension cover 2 to move upward until the first sealing edge strip 101 and the second sealing edge strip 201 set on the upper surface of the protective cover body 1 and the extension cover 2 are in contact with the lower surface of the welding specimen. The device facilitates the protective cover body 1 and the extension cover 2 to fit the bottom of the welding specimen.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A retractable protective cover for the reverse side of a groove of a tungsten inert gas arc welding, comprising a protective cover body (1), characterized in that: The upper surface of the protective cover body (1) is fixedly connected to a first sealing edge strip (101), and a sliding groove (102) is provided on the upper surface of the first sealing edge strip (101); the interior of the protective cover body (1) is slidably connected to an extension cover (2), and the upper surface of the extension cover (2) is fixedly connected to a second sealing edge strip (201); a supporting mechanism (3) for supporting the protective cover body (1) and the extension cover (2) is provided at the bottom of the protective cover body (1); and an adjusting mechanism (4) for adjusting and locking the extension length is provided between the protective cover body (1) and the extension cover (2); The adjusting mechanism (4) comprises a threaded block (401), an adjusting screw (402), a screw head (403), a limiting plate (404), a rubber damping ring (405), a limiting sliding rod (406) and a blocking column (407), wherein the threaded block (401) is fixedly connected to the bottom of the inner cavity of the extension cover (2), the adjusting screw (402) is threadedly connected to the inside of the threaded block (401), the screw head (403) is fixedly connected to the outer end of the adjusting screw (402), the limiting plate (404) is fixedly connected to one side of the inner wall of the extension cover (2), the rubber damping ring (405) is fixedly connected to the inside of the limiting plate (404), the limiting sliding rod (406) is slidably inserted into the inside of the rubber damping ring (405), and the blocking column (407) is fixedly connected to the inner end of the limiting sliding rod (406).

2. The retractable protective cover for the reverse side of the groove of tungsten inert gas arc welding according to claim 1, characterized in that: The support mechanism (3) comprises a support arm (301), a first fixing plate (302), a side arm (303), a second fixing plate (304), a first hinge block (305), a telescopic rod (306), a locking bolt (307), a second hinge block (308), an adjustment nut (309), an adjustment screw rod (310), a rubber grip ring (311), a support seat (312) and a rotating seat (313), wherein the support arm (301) is fixedly connected to the lower surface of the protective cover body (1), the first fixing plate (302) is fixedly connected to the top end of the support arm (301), the side arm (303) is fixedly connected to the side wall of the support arm (301), the second fixing plate (304) is fixedly connected to the top end of the side arm (303), the first hinge block (305 ... first hinge block (305) is fixedly connected to the side wall of the support arm (301), the second fixing plate (304) is fixedly connected to the top end of the side arm (303), the first hinge ) is fixedly connected to a side of the support arm (301) away from the side arm (303), the bottom end of the telescopic rod (306) is rotatably connected to the inside of the first hinge block (305), the locking bolt (307) is rotatably connected to the side wall of the telescopic rod (306), the second hinge block (308) is fixedly connected to the lower surface of the extension cover (2), the adjusting nut (309) is fixedly connected to the lower surface of the support arm (301), the adjusting screw (310) is threadedly connected to the inside of the adjusting nut (309), the rubber grip ring (311) is fixedly connected to the side wall of the bottom end of the adjusting screw (310), the rotating seat (313) is rotatably connected to the bottom end of the adjusting screw (310), and the support seat (312) is fixedly connected to the lower surface of the rotating seat (313).

3. The retractable protective cover for the reverse side of the groove of tungsten inert gas arc welding according to claim 1, characterized in that: An air intake valve (103) is fixedly connected to one side of the protective cover body (1).

4. The retractable protective cover for the reverse side of the groove of tungsten inert gas arc welding according to claim 1, characterized in that: An exhaust valve (202) is fixedly connected to one side of the expansion cover (2).

5. The retractable protective cover for the reverse side of the groove of tungsten inert gas arc welding according to claim 1, characterized in that: The outer end of the adjusting screw (402) is rotatably connected to one side of the protective cover body (1).

6. The retractable protective cover for the reverse side of the groove of tungsten inert gas arc welding according to claim 1, characterized in that: The limiting sliding rod (406) is fixedly connected to the inner wall of the protective cover body (1), and the limiting sliding rod (406) penetrates and is slidably inserted into the interior of the limiting plate (404).

7. The retractable protective cover for the reverse side of the groove of tungsten inert gas arc welding according to claim 2, characterized in that: The first fixing plate (302) is fixedly connected to the lower surface of the protection cover body (1), and the second fixing plate (304) is fixedly connected to the lower surface of the protection cover body (1).

8. The retractable protective cover for the reverse side of the groove of tungsten inert gas arc welding according to claim 2, characterized in that: The inner end of the locking bolt (307) contacts the telescopic end surface of the telescopic rod (306), and the top end of the telescopic rod (306) is rotatably connected to the inside of the second hinge block (308).

9. The retractable protective cover for the reverse side of the groove of tungsten inert gas arc welding according to claim 2, characterized in that: The adjusting screw rod (310) is threadably raised and lowered inside the supporting arm (301).

10. The retractable protective cover for the reverse side of the groove of tungsten inert gas arc welding according to claim 4, characterized in that: The inner cavities of the expansion cover (2) and the protection cover main body (1) are in communication, the second sealing edge strip (201) is slidably connected to the inner side of the first sealing edge strip (101), and the second sealing edge strip (201) is sealed and fitted with the first sealing edge strip (101).

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