CN217254084U - Welding butt tongs - Google Patents

Abstract

The application discloses welding is to mouthpart, relates to the technical field of pliers to it is difficult to guarantee the technical problem of work piece butt joint welding axiality among the prior art to solve. The welding is to mouthpart pincers of this application includes pincers body and fixed part. Wherein, one end of the clamp body is provided with a clamp opening; the fixed part is arranged on the jaw and comprises two symmetrically arranged scale blocks, and the two scale blocks are connected with the jaw body; the adjacent side walls of the two scale blocks are respectively provided with an arc-shaped groove, and when the scale blocks are close to each other, the two arc-shaped grooves form a containing hole so as to align the butt joints of a plurality of workpieces and clamp the workpieces. Therefore, the welding method has the advantages of being simple to operate and high in welding quality.

Description

Welding butt tongs

Technical Field

The application relates to the technical field of pliers, in particular to a pair of welding pliers.

Background

In the prior art, various conveying and shunting devices are needed in a high-purity special gas conveying system, the devices follow the design principle of '3D' with few dead angles, and a large number of mini adapter transition communication pipelines need to be welded at the connection positions of the devices. When welding mini adapter, mini adapter's welding distance is extremely short, and the workman needs to use the spirit level supplementary in order to guarantee butt joint's axiality, and this welding operation also is higher to workman's skill level investigation degree. Therefore, the welding operation of the related workpieces such as the adapter is generally extremely low in working efficiency and extremely high in working cost at present.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a welding is to mouthpart, and it can realize that a plurality of work pieces are based on the welding of predetermineeing the angle, and can reduce the technical merit requirement to welding operation personnel when guaranteeing work piece welding quality.

The embodiment of the application is realized as follows:

the application provides a welding is to mouthpart, includes: a clamp body and a fixing part.

Wherein, one end of the clamp body is provided with a clamp opening; the fixed part is arranged on the jaw and comprises two symmetrically arranged scale blocks, and the two scale blocks are connected with the jaw body; the adjacent side walls of the two scale blocks are respectively provided with an arc-shaped groove, and when the scale blocks are close to each other, the two arc-shaped grooves form a containing hole so as to align the butt joints of a plurality of workpieces and clamp the workpieces.

In one embodiment, one end of the fixing portion is provided with a welding opening, and the welding opening is communicated with the accommodating hole.

In one embodiment, each scale block is provided with a reference surface, the reference surface is perpendicular to the axis of the accommodating hole, and the angle scale is arranged on the reference surface.

In one embodiment, the reference surfaces include a first reference surface and a second reference surface, and the first reference surface and the second reference surface are disposed on two opposite surfaces of each scale block.

In one embodiment, the pliers body comprises: link assembly and clamping part.

The connecting rod assembly comprises a first connecting rod and a second connecting rod; the clamping part includes: the fixed clamp block and the movable clamp block; the fixed clamp block is connected with the first connecting rod, the movable clamp block is rotatably arranged on the first connecting rod, and the second connecting rod is rotatably arranged on the movable clamp block; a jaw is formed between the adjacent side walls of the movable clamp block and the fixed clamp block; the two scale blocks are respectively connected with the movable clamp block and the fixed clamp block; the second connecting rod drives the movable clamp block to enable the two scale blocks to be close to each other.

In one embodiment, the connecting rod assembly further comprises a first elastic member, one end of the first elastic member is connected with the movable clamp block, and the other end of the first elastic member is connected with the first connecting rod; when the two scale blocks are close to each other, the first elastic piece is stretched to generate elastic deformation.

In an embodiment, the connecting rod assembly further includes a supporting rod, the first connecting rod is provided with a bar-shaped mounting groove, one end of the supporting rod is movably disposed in the bar-shaped mounting groove, and the other end of the supporting rod is rotatably disposed on the second connecting rod.

In an embodiment, link assembly still includes adjusting screw, and first connecting rod still is equipped with the regulation hole, and the regulation hole communicates with bar mounting groove, and adjusting screw's one end stretches into and supports by on the terminal surface in the vaulting pole from the regulation hole.

In one embodiment, one end of the adjusting screw rod extending into the first connecting rod is abutted against the support rod through the second elastic piece.

In one embodiment, the connecting rod assembly further includes a pressing rod, and one end of the pressing rod is connected with the second connecting rod.

Compared with the prior art, the beneficial effect of this application is: the arc-shaped groove is formed in the scale block of the fixing part, so that clamping of a plurality of workpieces to be welded in subsequent welding operation is realized, and the workpieces are aligned to the joint; the angle scales are arranged on the scale blocks, so that the reference positions of a plurality of workpieces form preset angles after welding. This application has guaranteed the welding quality of welding under easy operation's prerequisite, avoids welding quality not conform to the problem that the requirement caused material consume, cost increase, the reduction of very big degree to welding operating personnel's technical requirement, improved welding operation's work efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic diagram of an overall structure of a welding pair pliers according to an embodiment of the present application;

FIG. 2 is an enlarged partial schematic view at A shown in FIG. 1;

FIG. 3 is a schematic diagram of a welding pair pliers according to an embodiment of the present application;

FIG. 4 is an exploded view of a welding pair of jaws shown in one embodiment of the present application;

fig. 5 is a schematic structural diagram of a welding pair pliers according to an embodiment of the present application.

An icon: 1-welding a pair of pliers; 2-a clamp body; 20-clamping jaw; 200-a saw-tooth structure; 21-a clamping part; 22-a connecting-rod assembly; 211-fixed clamp blocks; 212-movable clamp blocks; 221-a first link; 222-a second link; 223-a first elastic member; 224-a strut; 225-adjusting screw; 226-a pressure bar; 2121-a first axis of rotation; 2122-a second rotation hole; 2210-bar-shaped mounting grooves; 2222-second rotation axis; 2221-a third fixed shaft; 2211-first rotating aperture; 2212-adjustment holes; 2213-first fixed axis; 2214-second fixed axis; 2251-a second elastic element; 3-a fixed part; 30-scale block; 300-a reference plane; 3001 — a first reference surface; 3002-a second reference plane; 301-angle scale; 302-angle ruler; 310-arc-shaped groove; 31-a receiving hole; 32-a welding port; 4-a workpiece; 41-a first workpiece; 42-a second workpiece; 410-a first pair of joints; 420-a second pair of connectors; 411-first reference; 421-second reference portion.

Detailed Description

The terms "first," "second," "third," and the like are used for descriptive purposes only and not for purposes of indicating or implying relative importance, and do not denote any order or order.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when products of the application are used, and are used only for convenience in describing the application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application.

In the description of the present application, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may for example be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.

The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic view of an overall structure of a welding pair pliers 1 according to an embodiment of the present application. The welding pair pliers 1 includes: a clamp body 2 and a fixing part 3. Wherein, one end of the forceps body 2 is provided with a jaw 20; the fixing portion 3 is arranged on the jaw 20, the fixing portion 3 comprises two scale blocks 30, and the two scale blocks 30 are symmetrically arranged and are connected with the forceps body 2.

In an embodiment, the two scale blocks 30 of the fixing portion 3 and the clamp body 2 can be integrally formed by welding, and can also be fixedly connected together by means of a buckle, a screw and the like.

The caliper body 2 includes a clamping portion 21 and a link assembly 22. The link assembly 22 includes a first link 221 and a second link 222. The clamping portion 21 includes a fixed clamp piece 211 and a movable clamp piece 212. The fixed block 211 is connected to the first link 221, the movable block 212 is connected to the second link 222 and the first link 221, and the movable block 212 can be driven by the second link 222 to gradually close to the fixed block 211.

The welding pair pliers 1 provided by the application is mainly used for clamping the workpiece 4 when the workpiece 4 is welded. Work piece 4 mainly is the adapter that is used for pipeline or equipment to connect in actual gas transmission equipment, and the welding is to fixed part 3 of tong 1 when guaranteeing the axiality of 4 (adapter) splice butt joint positions of work piece, can also realize having the angle of predetermineeing of requirement between the reference position that a plurality of work pieces 4 (adapter) correspond after the welding, realizes that the concrete structure of above-mentioned function is as follows:

referring to fig. 2, fig. 2 is a partially enlarged schematic view of a portion a shown in fig. 1. As shown in fig. 2, the adjacent side walls of the two scale blocks 30 of the fixing portion 3 are respectively provided with an arc-shaped groove 310, when the two scale blocks 30 approach each other, the two arc-shaped grooves 310 form a receiving hole 31, and the receiving hole 31 is used for clamping the butt joint position of the workpiece 4 for subsequent welding.

One end of the fixing portion 3 is provided with a welding port 32, and the welding port 32 communicates with the accommodation hole 31. In an actual operation, after an operator puts the welding butt portions of the plurality of workpieces 4 in the accommodation hole 31 and clamps the plurality of workpieces 4 by the arc-shaped grooves 310, the butt portions of the workpieces 4 are welded through the welding port 32 from the outside of the welding butt using a spot welder (or other welding tool).

Each scale block 30 has a reference surface 300, and the reference surface 300 is perpendicular to the axis of the receiving hole 31. The angle scales 301 are arranged on the reference surface 300, and when the two scale blocks 30 approach each other and form the accommodating hole 31, the angle scales 301 on the two reference surfaces 300 are spliced to form a fan-shaped angle ruler 302. The angle scale 302 is mainly used for adjusting the workpiece 4 to align with the preset angle scale 301 after the workpiece 4 is placed.

In the embodiment of the present application, the angle scales 301 may be uniformly distributed on the reference surface 300 through various methods such as laser, digital punching, silk printing, and pasting. The angle scale 301 may be a single fixed unit at 15 degrees, or may be a single fixed unit at an angle of another size as needed.

The fixed block 211 and the movable block 212 have a pair of adjacent sidewalls forming a jaw 20 therebetween, in an embodiment of the present application, the fixed block 211 and the movable block 212 have a saw-toothed structure 200 on the adjacent sidewalls, and the fixing portion 3 is disposed at a distal end of the jaw 20. In other embodiments of the present invention, the adjacent side walls of the fixed block 211 and the movable block 212 may be smooth flat surfaces or arc surfaces, and only two calibration blocks 30 are connected to the distal end of the jaw 20.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a welding pair pliers 1 according to an embodiment of the present application. As shown in fig. 2 and 3, the receiving hole 31 of the fixing portion 3 is used for aligning welding positions of a plurality of workpieces 4 (for example, a butt joint on an adapter) and clamping the workpieces 4. The number of workpieces 4 to be aligned and clamped for subsequent welding is generally two; if it is desired to weld a single, simple piece of the same outside diameter between the welding locations of two workpieces 4, there are three workpieces 4 to be welded (aligned and clamped). In the present application, taking two workpieces 4 to be welded as an example, in an actual operation process, an operator needs to put the first pair of joints 410 of the first workpiece 41 and the second pair of joints 420 of the second workpiece 42 between the arc-shaped grooves 310 of the two scale blocks 30, and then apply a force to the second link 222 to make the two scale blocks 30 approach each other, and the receiving holes 31 formed in the arc-shaped grooves 310 align and clamp the first pair of joints 410 and the second pair of joints 420, so that the subsequent operator can weld the exposed butt joints of the first pair of joints 410 and the second pair of joints 420 through the welding openings 32 by using a welding tool.

The arc radius of the arc groove 310 is used for ensuring the coaxiality of butt joints of a plurality of workpieces 4 during welding, and the arc radius of the arc groove 310 is various according to the size of the outer diameter of the butt joint of the workpieces 4. For example, based on the outer diameter of the butt joint of the conventional adapter, the specific size of the arc radius may be 1/4 inches, 3/8 inches or 1/2 inches, so as to ensure that the workpiece 4 is more engaged with the outer wall of the butt joint when the butt joint of the workpiece 4 is clamped, thereby ensuring that the workpiece 4 is stable and does not shake in the subsequent welding process and ensuring the butt joint coaxiality of a plurality of butt joints.

Referring to fig. 2 and 3, the reference surfaces 300 of the scale blocks 30 include a first reference surface 3001 and a second reference surface 3002, and the first reference surface 3001 and the second reference surface 3002 are perpendicular to the axis of the accommodating hole 31 and located on two opposite sides of each scale block 30. Wherein the first reference surfaces 3001 of the two scale blocks 30 face in the same orientation and the second reference surfaces 3002 of the two scale blocks 30 face in the other same orientation. In an embodiment of the present application, the angle scales 301 may be disposed on both the first reference surface 3001 and the second reference surface 3002, so that when the two scales 30 approach each other, a fan-shaped angle scale 302 is formed by splicing the angle scales 301 on the first reference surface 3001, and a fan-shaped angle scale 302 is formed by splicing the angle scales 301 on the second reference surface 3002 corresponding to the two scales 30. In each scale block 30, the projection of the angle scale 301 of the first reference surface 3001 and the projection of the angle scale 301 of the second reference surface 3002 along the axial direction of the receiving hole 31 are completely overlapped, so that when the workpiece 4 to be welded is aligned with the angle scale 301, the reference degree directions are consistent.

In an operation process, a standard line may be marked on the first workpiece 41 and the second workpiece 42, a first preset angle is fixed between an axis of the first reference portion 411 on the first workpiece 41 and the standard line, a second preset angle is fixed between an axis of the second reference portion 421 on the second workpiece 42 and the standard line, when the first and second pairs of joints 410 and 420 are clamped through the accommodating hole 31, an operator adjusts the rotation direction of the first workpiece 41 and the second workpiece 42 based on the first and second preset angles and the preset angle formed by the axes of the welded first and second reference portions 411 and 421, so that the standard line of the first workpiece 41 is aligned with the corresponding angle scale 301 on the first reference surface 3001, the standard line of the second workpiece 42 is aligned with the corresponding angle scale 301 on the second reference surface 3002, and the workpieces are clamped after alignment, thereby after the welding of the joints of the two workpieces 4 is completed, a conversion angle required by connection between each device in actual gas delivery can be formed between the first reference portion 411 and the second reference portion 421, and the conversion angle is a preset angle formed by axes of the first reference portion 411 and the second reference portion 421 after welding.

In one embodiment of the present application, the two scale blocks 30 are identical; in other embodiments of the present application, the two scales 30 can be set to different shapes or sizes (for example, the thicknesses of the two scales 30 are different) according to the requirements of the actual welding operation, the scales 30 of different styles need to ensure that the arc radii of the two arc grooves 310 for clamping the butt joint are consistent, the adjacent side walls of the scales 30 do not interfere with each other during the alignment and clamping process, the scales 30 do not interfere with the workpiece 4, and the angle scale 302 of the scales 30 is normally used, so as to further ensure the normal welding operation and the welding quality.

Referring to fig. 4, fig. 4 is an exploded view of a welding pair pliers 1 according to an embodiment of the present application; referring to fig. 5, fig. 5 is a schematic structural diagram of a welding pair pliers 1 according to an embodiment of the present application.

As shown in fig. 3, fig. 4 and fig. 5, the movable clamp block 212 is provided with a first rotating shaft 2121, the first connecting rod 221 is provided with a first rotating hole 2211, and the movable clamp block 212 is rotatably provided on the first connecting rod 221 by the connection between the first rotating shaft 2121 and the first rotating hole 2211; the second link 222 is provided with a second rotating shaft 2222, the movable pincer block 212 is provided with a second rotating hole 2122, the movable pincer block 212 extends into the second link 222 from one end of the second link 222 and is connected with the first rotating shaft 2121 and the second link 222 through the second rotating shaft 2222, and the second link 222 is rotatably provided on the movable pincer block 212; the fixed jaw 211 is inserted into the first link 221 from one end of the first link 221, and is fixed to the first link 221 by a first fixing shaft 2213 and a second fixing shaft 2214.

The connecting rod assembly 22 further includes a pressing rod 226, and one end of the pressing rod 226 is fixedly connected to the second connecting rod 222 through a third fixed shaft 2221. The pressure rod 226 is held by the operator and applies force to bring the scale blocks 30 closer together, thereby achieving better power saving. The pressing lever 226 may be fixed to the second link 222 through the third fixing shaft 2221 after forming a desired angle with the second link 222. In other embodiments of the present application, the first fixing shaft 2213, the second fixing shaft 2214 and the third fixing shaft 2221 may be universal parts such as rivets.

The link assembly 22 further includes a stay 224, as shown in fig. 5, a bar-shaped mounting groove 2210 is formed on a side wall of the first link 221, one end of the stay 224 is movably disposed in the bar-shaped mounting groove 2210, and the other end of the stay 224 is rotatably disposed on the second link 222.

In one embodiment, the connecting rod assembly 22 further includes an adjusting screw 225, the other end of the first connecting rod 221 is further provided with an adjusting hole 2212, the adjusting hole 2212 is communicated with the strip mounting groove 2210, and one end of the adjusting screw 225 extends from the adjusting hole 2212 and abuts against the end surface of the brace 224.

In an embodiment, one end of the adjusting screw 225 extending into the first link 221 may further abut against the stay 224 through a second elastic member 2251 to reduce wear to the stay 224, and one end of the second elastic member 2251 is connected to the adjusting screw 225, and the other end abuts against an end surface of the stay 224. In an embodiment of the present application, the first elastic element 223 may be a spring, one end of the spring is sleeved outside the adjusting screw 225 and connected with the adjusting screw 225, or one end of the spring directly abuts against an end surface of the adjusting screw 225; the other end of the spring abuts against an end surface of the strut 224. In other embodiments, the second elastic member 2251 may be an elastic member such as a rubber strip.

The connecting rod assembly 22 further comprises a first elastic member 223, one end of the first elastic member 223 is connected with the movable caliper block 212, and the other end of the first elastic member 223 is connected with the first connecting rod 221; when the operator applies force to the pressing rod 226 to approach the two scale blocks 30, the first elastic member 223 is elongated and elastically deformed. In one embodiment of the present application, the first elastic member 223 may be a spring, and in other embodiments of the present application, the first elastic member 223 may be another elastic member such as a rubber strip. The first elastic member 223 is deformed again when the operator releases the pressing rod 226 and no longer applies force to the pressing rod 226, and the first elastic member 223 pulls the movable clamp block 212 to return to be away from the fixed clamp block 211, so that the two scale blocks 30 are away from each other.

Referring to fig. 1 to 5, in an operation process, before welding is ready, an operator first unscrews the adjusting screw 225 to a maximum position, butt-joints the butt-joint head of the first workpiece 41 and the butt-joint head of the second workpiece 42 are butt-jointed and accommodated between the arc grooves 310 of the two scale blocks 30, and then applies force to the pressure rod 226 to make the two scale blocks 30 approach each other and clamp the butt-joint head of the workpiece 4 by the arc grooves 310. The operator, keeping the clamping action applied, screws the adjustment screw 225 to continue abutting against the end surface of the stay 224, and moves the end of the stay 224 adjacent to the adjustment screw 225 within the bar mounting groove 2210 until it is no longer difficult to screw the adjustment screw 225.

At this time, the operator may release the pressing rod 226, and adjust the orientations of the two workpieces 4 based on the welding requirement, so that the standard line of the first workpiece 41 is aligned with the corresponding angle scale 301 on the first reference surface 3001, and the standard line of the second workpiece 42 is aligned with the corresponding angle scale 301 on the second reference surface 3002, so that the required conversion angle for connecting the gas delivery apparatus can be formed between the first reference portion 411 of the first workpiece 41 and the second reference portion 421 of the second workpiece 42 after welding the workpieces 4. The operator screws the adjustment screw 225 again after aligning the scales to adjust the clamping width of the accommodation hole 31. Then, a force is applied to the pressing rod 226 again, the second connecting rod 222 moves under the support and rotation of the supporting rod 224, the movable clamp block 212 is pushed by the second connecting rod 222 to rotate around the first rotating hole 2211 so that the movable clamp block 212 and the fixed clamp block 211 approach each other, the arc-shaped groove 310 of the scale block 30 clamps the butt joint of the two workpieces 4, and an operator performs a welding operation on the joint of the butt joint of the two workpieces 4 by using a welding tool from the welding port 32.

During the above operation, if the operator feels a lack of tightness when gripping the docking head, the adjustment screw 225 may be appropriately screwed in or out to change the degree of gripping.

According to the welding fixture, the arc-shaped groove 310 is formed in the scale block 30 of the fixing portion 3, and then the accommodating hole 31 is formed when the scale block 30 is close to each other, so that the accommodating hole 31 clamps and aligns the butt joint in subsequent welding operation of a plurality of workpieces 4 to be welded, and the coaxiality of the butt joint after welding is guaranteed. The present application also realizes that the reference positions of a plurality of workpieces 4 (for example, the reference portions of the workpieces 4) are fixed and have a preset angle with each other after welding to meet the requirement of equipment connection by arranging the angle scale 301 on the scale block 30. The welding quality of a welding part is guaranteed on the premise of simple operation, the technical requirements on welding operators are reduced, and the working efficiency of welding operation is greatly improved.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A welding pair pliers, comprising:

the pliers comprise a pliers body, wherein one end of the pliers body is provided with a pliers opening;

the fixing part is arranged on the jaw and comprises two symmetrically arranged scale blocks, and the two scale blocks are connected with the clamp body;

the adjacent side walls of the two scale blocks are respectively provided with an arc-shaped groove, and when the scale blocks are close to each other, the two arc-shaped grooves form a containing hole so as to align butt joints of a plurality of workpieces and clamp the workpieces.

2. The welding pair pliers according to claim 1, wherein one end of said fixing portion is provided with a welding port, and said welding port communicates with said receiving hole.

3. The welding pair pliers of claim 1, wherein each of the scale blocks has a reference surface perpendicular to an axis of the receiving hole, the reference surface having an angular scale disposed thereon.

4. The welding pair of jaws according to claim 3, wherein said reference surfaces comprise a first reference surface and a second reference surface, said first reference surface and said second reference surface being provided on opposite sides of each of said graduated blocks.

5. The welding pair pliers of claim 1, wherein the plier body includes:

the connecting rod assembly comprises a first connecting rod and a second connecting rod;

a clamping portion, the clamping portion comprising: the fixed clamp block and the movable clamp block;

the fixed clamp block is connected with the first connecting rod, the movable clamp block is rotatably arranged on the first connecting rod, and the second connecting rod is rotatably arranged on the movable clamp block; the jaw is formed between adjacent side walls of the movable clamp block and the fixed clamp block;

the two scale blocks are respectively connected with the movable clamp block and the fixed clamp block; the second connecting rod drives the movable clamp block to enable the two scale blocks to be close to each other.

6. The welding pair of jaws according to claim 5, wherein said connecting-rod assembly further comprises:

one end of the first elastic piece is connected with the movable clamp block, and the other end of the first elastic piece is connected with the first connecting rod;

when the two scale blocks are close to each other, the first elastic piece is stretched to generate elastic deformation.

7. The welding pair of jaws according to claim 5, wherein said connecting-rod assembly further comprises:

the first connecting rod is provided with a strip-shaped mounting groove, one end of the supporting rod is movably arranged in the strip-shaped mounting groove, and the other end of the supporting rod is rotatably arranged on the second connecting rod.

8. The welding pair of jaws according to claim 7, wherein said connecting-rod assembly further comprises:

adjusting screw, first connecting rod still is equipped with the regulation hole, the regulation hole with bar mounting groove intercommunication, adjusting screw's one end is followed the regulation hole stretches into and supports by in on the terminal surface of vaulting pole.

9. The welding pair of mouth pliers according to claim 8 wherein the end of said adjusting screw extending into said first link abuts against said brace by a second resilient member.

10. The welding pair of jaws according to claim 5, wherein said linkage assembly further comprises a compression bar, one end of said compression bar being connected to said second linkage.

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