CN216462803U - Limiting clamp for welding circular tube - Google Patents

Abstract

The utility model discloses a limiting clamp for circular tube welding in the technical field of circular tube welding, which comprises a supporting frame, wherein a base for stably supporting a circular tube piece is provided with a limiting groove at the top; at least two support frames are erected on the same working surface, and the axes of the limiting grooves of the two support frames are the same straight line; the slip holder erects the base of pipe spare for stable erection, erects between two support frames, and open locking groove has been seted up at the top, the locking groove both ends pierce through both sides around the slip holder can weld more stably, will little pipe and pipe spare centre gripping inseparable to ensure that the pressfitting of two pipes is inseparable, the axis of two pipes is parallel to each other during the welding simultaneously, and welding process also enables little pipe and pipe spare and continuously keeps the laminating inseparable, and can not take place the displacement, thereby guaranteed the welding stability of two pipes.

Description

Limiting clamp for welding circular tube

Technical Field

The utility model relates to the technical field of pipe fitting welding, in particular to a limiting clamp for circular pipe welding.

Background

During welding operation, because the welded welding seam can expand, the expansion force can change the position of two work pieces welded into a whole, and when welding operation is completed, the welding seam can contract when being cooled, so that the accuracy of the welded work pieces is very poor, some work pieces with smooth surfaces can be well operated when being welded, only the two smooth work pieces need to be pressed by hands, and then welding is carried out, so that the work pieces are pressed together, and the position of the welded work pieces can basically keep the pressed position relation.

In order to weld with higher precision, a clamp is needed when a plurality of workpieces are welded, two workpieces are clamped together by a quick clamp generally, so that the workpieces can keep higher stability, the position of the workpieces is almost not displaced in the welding process after welding, the welding precision can be better ensured, and then the surface of a welding seam is polished to be smooth.

The conventional circular tube is difficult to weld, the clamping device is difficult to completely clamp because the surface of the circular tube is uneven, the circular tube can not only translate but also rotate along the axis, when the circular tube is welded with a straight plate, the straight plate can be accurately welded by limiting the position of the straight plate, however, another circular tube is welded on the circular tube, the position cannot be completely fixed basically, the circular tube can only be clamped by a plurality of quick clamps, but the welding can not be carried out after the gap between the two circular tubes is completely extruded, and the gap is certainly formed between the two circular tubes in a common clamping mode;

when a round pipe with smaller diameter and length is welded on another round pipe, particularly when the diameter of the welded smallest round pipe is less than 1cm, the welding is very difficult, the round pipe can be clamped by a hand-held pliers for welding, the welding mode has no relative reference object and clamp, the precision cannot be guaranteed, and the welding is successful if the welding inclination is not welded.

Based on the above, the utility model designs a limiting clamp for welding a circular tube, so as to solve the above problems.

Disclosure of Invention

The utility model aims to provide a limiting clamp for welding round pipes, which can be used for welding more stably, clamping a small round pipe and a round pipe piece tightly, ensuring that the two round pipes are pressed tightly, ensuring that the axes of the two round pipes are parallel to each other during welding, ensuring that the position during welding is stable, and ensuring that the small round pipe and the round pipe piece are continuously and tightly attached without displacement during welding, thereby ensuring the welding stability of the two round pipes.

The utility model is realized in the following way: a limiting clamp for welding a circular tube comprises a small circular tube and a circular tube piece;

the spacing anchor clamps include: the supporting frame is a base for stably supporting the round pipe fitting, and the top of the supporting frame is provided with a limiting groove;

at least two support frames are erected on the same working surface, and the axes of the limiting grooves of the two support frames are the same straight line;

a sliding clamping seat which is a base stably erected with a round pipe fitting and is erected between two supporting frames, the top of the sliding clamping seat is provided with an open locking groove, two ends of the locking groove penetrate through the front side and the rear side of the sliding clamping seat,

the sliding rod is arranged at the bottom of the sliding clamping seat in a sliding mode and driven to horizontally slide at the bottom of the sliding clamping seat through the pushing rod;

the locking grooves of the sliding clamping seat and the limiting grooves of the two supporting frames have the same axis;

the sliding clamping plate is arranged at one end of the sliding rod, the bottom of one vertical side wall is provided with a circular arc-shaped clamping groove, and the diameter of the arc surface of the clamping groove is the same as that of the welded small circular tube; the small round pipe can be separately clamped on the top of the round pipe piece through the clamping groove of the sliding clamping plate;

when the small round pipe is clamped on the round pipe fitting by the clamping groove, the axes of the clamping groove, the small round pipe, the round pipe fitting and the locking groove are parallel to each other and are positioned on the same vertical plane.

Furthermore, the limiting groove is a U-shaped groove with an opening at the top, the bottom of the limiting groove is semicircular, the arc at the bottom of the limiting groove is in clearance fit with the side wall of the circular tube piece, and the clearance is not more than 0.2 mm;

the limiting groove penetrates through the supporting frame in the front-back direction.

Furthermore, the shape and the size of each support frame are the same, the size and the shape of the limiting groove formed in each support frame are also the same, a rapid clamp is erected above at least one limiting groove, and the round pipe fitting can be separately clamped in the limiting groove through the rapid clamp.

Further, the top edge of the clamping groove is positioned right above the horizontal axis of the inner circular arc of the clamping groove;

an elevating plate is vertically fixed at one end of the sliding rod, the sliding clamping plate is horizontally fixed at the top of the elevating plate, the angle of an inner arc surface of the clamping groove is not less than 90 degrees, and a vertical side wall of the sliding clamping plate above one side of the clamping groove exceeds a vertical surface where the axis of the small circular tube is located;

the clamping groove does not shield the contact surface of the small round pipe and the round pipe fitting;

when the clamping groove is positioned at a clamping station right above the locking groove, the shortest distance from the highest point of the arc surface of the clamping groove to the locking groove is the sum of the diameters of the small round pipe and the round pipe fitting.

Furthermore, a clamping plate is further arranged on the rear side face of the sliding clamping plate, the clamping plate is a vertical flat plate, and the clamping plate blocks the opening at the rear end of the clamping groove;

the clamping plate is positioned above the small circular tube, and the vertical minimum distance between the clamping plate and the top of the small circular tube is 2-5 mm.

Furthermore, the sliding rod and the groove at the top of the sliding clamping seat do not interfere with each other;

the sliding direction of the sliding rod is vertical to the projection of the axis of the groove at the top of the sliding clamping seat on the same horizontal plane;

the sliding direction of the sliding rod and the axis of the groove at the top of the sliding clamping seat are both horizontally arranged.

Further, the pushing rod is a linear telescopic manual pushing rod or a hydraulic pushing rod.

The utility model has the beneficial effects that: 1. according to the utility model, the outer wall of the small round pipe is subjected to laminating limit control through the clamping groove of the sliding clamping plate, so that the axes are ensured to be parallel to each other when the small round pipe and the round pipe are clamped, and the small round pipe is positioned right above the round pipe, thus the welding accuracy can be ensured;

2. through the slide bar horizontal slip, through horizontal slip's slip splint and slip holder, press from both sides the pipe spare with little pipe completely tight, and pipe spare all directions are all motionless, little pipe has also been pressed from both sides by the complete clamp, and the slip splint is tight because horizontal slip presss from both sides, it can't change to have guaranteed highly, consequently, just can make the concatenation laminating between little pipe and the pipe spare inseparable, can't remove completely, thereby butt joint when having guaranteed the welding is inseparable, thereby make the welding seam inseparabler, thereby the welding precision of the pipe spare of variation in size has been improved.

Drawings

The utility model will be further described with reference to the following examples with reference to the accompanying drawings.

FIG. 1 is a top view of the overall structure of the present invention;

FIG. 2 is a schematic side view of the clamping state of the small round tube and the round tube of the present invention;

FIG. 3 is a schematic view of the position of the clamping groove on the sliding clamping plate according to the present invention;

FIG. 4 is a front view of the sliding clamp of the present invention;

FIG. 5 is a schematic view of a support of the present invention;

FIG. 6 is a schematic view of a sliding holder according to the present invention;

FIG. 7 is a schematic view of the angles of the m and n arcs of the clip groove of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1-support frame, 11-limit groove, 12-quick clamp, 2-sliding clamp seat, 21-slide bar, 22-push bar, 23-locking groove, 3-sliding clamp plate, 31-elevating plate, 32-clamping groove, 33-clamping plate, 4-round pipe fitting and 41-small round pipe.

Detailed Description

Referring to fig. 1 to 7, the present invention provides a technical solution: a limiting clamp for welding a circular tube comprises a small circular tube 4 and a circular tube piece 4;

the spacing anchor clamps include: the supporting frame 1 is a base for stably supporting the round pipe fitting 4, and the top of the supporting frame is provided with a limiting groove 11;

at least two support frames 1 are erected on the same working surface, and the axes of the limiting grooves 11 of the two support frames 1 are the same straight line;

the sliding clamping seat 2 is a base for stably erecting the round pipe fitting 4 and is erected between the two supporting frames 1, the top part of the sliding clamping seat is provided with an open locking groove 23, the two ends of the locking groove 23 penetrate through the front side and the rear side of the sliding clamping seat 2,

a sliding rod 21 is slidably arranged at the bottom of the sliding clamping seat 2, and the sliding rod 21 is driven by a pushing rod 22 to horizontally slide at the bottom of the sliding clamping seat 2;

the locking groove 23 of the sliding clamping seat 2 has the same axis with the limiting grooves 11 of the two support frames 1;

the sliding clamp plate 3 is fixedly arranged at one end of the sliding rod 21, the bottom of one vertical side wall is provided with a circular arc-shaped clamp groove 32, and the diameter of the arc surface of the clamp groove 32 is the same as that of the welded small circular tube 41; the small round tube 41 can be separately clamped on the top of the round tube 4 through the clamping groove 32 of the sliding clamping plate 3;

work as when pressing from both sides the groove 32 and pressing from both sides the little pipe 41 tight on pipe spare 4, press from both sides the groove 32, little pipe 41, pipe spare 4 and locking groove 23 the axis and be in on same vertical plane that is parallel to each other, can weld more stably, it is inseparable with little pipe 41 and pipe spare 4 centre gripping, and ensure that the pressfitting of two pipes is inseparable, the axis of two pipes is parallel to each other during the welding simultaneously, and welding process also enables little pipe 41 and pipe spare 4 and continuously keeps the laminating inseparable, and can not take place the displacement, thereby the welding stability of two pipes has been guaranteed.

The limiting groove 11 is a U-shaped groove with an opening at the top, the bottom of the limiting groove 11 is semicircular, the arc at the bottom of the limiting groove 11 is in clearance fit with the side wall of the circular tube 4, and the clearance is not more than 0.2 mm;

the limiting groove 11 penetrates through the support frame 1 in the front-back direction, so that the round pipe fitting 4 can be limited not to displace during welding by the accurate size, and the welding precision is ensured;

the shape and the size of each support frame 1 are the same, the size and the shape of the limiting groove 11 formed in the support frame are also the same, a quick clamp 12 is erected above at least one limiting groove 11, and the round pipe fitting 4 can be separately clamped in the limiting groove 11 through the quick clamp 12, so that the accurate placement position of the round pipe fitting 4 is ensured;

the top edge of the clip groove 32 is directly above the horizontal axis of the inner arc of the clip groove 32;

an elevating plate 31 is vertically fixed at one end of the sliding rod 21, the sliding clamp plate 3 is horizontally fixed at the top of the elevating plate 31, the angle of an inner arc surface of the clamp groove 32 is not less than 90 degrees, and a vertical side wall of the sliding clamp plate 3 above one side of the clamp groove 32 exceeds a vertical surface on which the axis of the small circular tube 41 is covered;

the clamping groove 32 does not shield the contact surface of the small round tube 41 and the round tube piece 4;

when the clamping groove 32 is located at a clamping position right above the locking groove 23, the shortest distance from the highest point of the arc surface of the clamping groove 32 to the locking groove 23 is the sum of the diameters of the small circular tube 41 and the circular tube 4, the axis and the size of each part are limited, the position accuracy of the small circular tube 41 and the circular tube 4 during welding is ensured, the clamping state is kept, excessive deformation is avoided, and the positions of the small circular tube 41 and the circular tube 4 are kept unchanged even if the small circular tube is deformed;

a clamping plate 33 is further arranged on the rear side face of the sliding clamping plate 3, the clamping plate 33 is a vertical flat plate, and the clamping plate 33 is blocked at the opening at the rear end of the clamping groove 32;

the clamping plate 33 is arranged above the small circular tube 41, the vertical minimum distance between the clamping plate 33 and the top of the small circular tube 41 is 2-5mm, the clamping plate 33 is additionally arranged, the small circular tube 41 can be abutted to achieve the limiting and target aligning effects, and the small circular tube 41 can be arranged at the same horizontal position each time;

the sliding rod 21 and the groove at the top of the sliding clamping seat 2 do not interfere with each other;

the sliding direction of the sliding rod 21 is vertical to the projection of the axis of the groove at the top of the sliding clamping seat 2 on the same horizontal plane;

the sliding direction of the sliding rod 21 and the axis of the groove at the top of the sliding clamp seat 2 are both horizontally arranged, so that the stability of the sliding direction is ensured, and the small round tube 41 can be clamped by sliding and pulling the sliding rod 21;

the push rod 22 is a linear telescopic manual push rod or a hydraulic push rod, is convenient to use and operate, mainly achieves the function of horizontal pushing, and ensures clamping.

In one embodiment of the utility model:

the embodiment of the utility model provides a limiting clamp for welding a circular tube, and the limiting clamp provided by the utility model solves the technical problems that: 1. in the existing welding operation, deformation occurs in the heating and cooling processes, but the welding precision can be kept when two welding parts are matched and clamped, and the cold and hot change in the welding process generates smaller deformation or even does not generate deformation; the existing straight plate welding can be clamped by a clamp, but the welding between two circular pipes cannot be clamped by a conventional clamp; 2. when the diameters of the circular pipes are different, welding clamping is very difficult, only one circular pipe can be clamped by a clamp, and the other circular pipe can be clamped and pressed by a manual clamp for welding, so that the size and the position of a welding seam of a welded workpiece basically cannot meet the precision requirement of butt joint installation; 3. when one of the welded circular pipe workpieces is a small circular pipe 41 with the diameter not exceeding 1cm, the welding precision requirement is higher due to the small size of the workpiece, the welding flatness and the axial parallelism of the two welded circular pipes are also higher, and the conventional welding clamping means cannot accurately weld the workpiece.

The realized technical effects are as follows: 1. according to the utility model, the outer wall of the small circular tube 41 is subjected to joint limit control through the clamping groove 32 of the sliding clamping plate 3, so that the axes are parallel to each other when the small circular tube 41 and the circular tube 4 are clamped, and the small circular tube 41 is positioned right above the circular tube 4, thus the welding accuracy can be ensured;

2. the sliding rod 21 horizontally slides, the sliding clamping plate 3 horizontally slides in the sliding clamping seat 2, the small round tube 41 and the round tube 4 are completely clamped, all directions of the round tube 4 are not movable, the small round tube 41 is also completely clamped, and the sliding clamping plate 3 is horizontally slid and clamped, and the elevating plate 31 is fixed and unchanged, so that the height of the sliding clamping plate 3 cannot be changed, the small round tube 41 and the round tube 4 can be tightly spliced and attached and cannot be moved completely, the butt joint during welding is ensured to be tight, the welding seam is more tight, and the welding precision of the round tube 4 and the small round tube 41 with different sizes is improved;

3. because the axes of the clamping groove 32 and the locking groove 23 of the device are parallel to each other on the same vertical plane in the clamping state, when the sliding clamping plate 3 slides to the round pipe piece 4 to approach, the handheld small round pipe 41 can be carried together to approach to the round pipe piece 4, and the placing position of the small round pipe 41 is jointed, clamped and bound through the clamping groove 32, so that the outer wall of the small round pipe 41 is jointed with the clamping groove 32, and the axis of the small round pipe 41 can be parallel to the axis of the round pipe piece 4 in the same vertical plane after being corrected by the clamping groove 32;

4. when this device centre gripping pipe 41 is little, can lean on the pipe 41 downwards to compress tightly through the double-layered groove 32 that is greater than 90 cambered surfaces, ensure that pipe 41 is compressed tightly at pipe 4 tops by inseparable centre gripping, but ensure that two pipe work pieces can't the displacement, can improve the machining precision when so welding, the precision surpasss current clamping device's machining precision far away.

In order to solve the above problems, the technical solution in the embodiments of the present invention has the following general idea:

for better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the embodiments.

When the device is manufactured, firstly, two support frames 1 are arranged on a reference table board, a limit groove 11 is formed in each support frame, each limit groove 11 is a U-shaped groove with an arc bottom, the arc at the bottom of each limit groove 11 is a semicircle and is the same as the outer wall of a round pipe piece 4 in size, the round pipe piece 4 is ensured to be in clearance fit with the semicircle in each limit groove 11, the round pipe piece 4 can be placed in the limit groove and can be placed tightly, the round pipe piece 4 is not prone to rolling in the limit groove 11, therefore, the clearance needs to be small enough and needs to be controlled to be 0.1mm, the clearance is close to transition fit, the round pipe piece 4 is placed in the limit groove, the round pipe piece 4 is easy to place, the pushing is not needed, and the surface of the round pipe piece 4 cannot be scratched;

then, the two support frames 1 are arranged in order, the axes of the limiting grooves 11 in the two support frames 1 are on the same straight line, the heights of the bottoms of the two limiting grooves 11 are the same, a quick clamp 12 is installed beside at least one support frame 1, the quick clamp 12 belongs to a common device in a jig tool, a circular pipe 4 needs to be clamped in the limiting grooves 11 in the support frames 1 through the quick clamp 12, and the quick clamp 12 is better if the two support frames 1 are provided with the quick clamp 12;

then, a sliding clamp seat 2 is manufactured, a locking groove 23 is formed in the top of the sliding clamp seat 2, the locking groove 23 is also a U-shaped groove, the size and the bottom height of the locking groove 23 are completely the same as those of the limiting groove 11, the locking groove 23 is also a clamp for clamping the round pipe fitting 4, and the axes of the two limiting grooves 11 and the locking groove 23 are the same straight line; the sliding clamping seat 2 needs to be arranged between the two supporting frames 1;

only a sliding rod 21 is installed at the bottom of the sliding clamp seat 2, the sliding rod 21 horizontally slides at the bottom of the sliding clamp seat 2 through a sliding groove, the sliding direction of the sliding rod 21 is perpendicular to the projection of the axis of the limiting groove 11 on the same level, then a push rod 22 is installed at one end of the sliding rod 21, the push rod 22 can be a manual lever-type push rod, a vertical elevating plate 31 is fixedly installed at the other end of the sliding rod 21, the elevating plate 31 is used for lifting the height, a horizontal sliding clamp plate 3 is installed at the top of the elevating plate 31, a clamp groove 32 is formed in the bottom of the vertical side wall of one side, facing the sliding clamp seat 2, of the sliding clamp plate 3, the clamp groove 32 is a cylindrical arc surface with an angle exceeding 90 degrees, and the clamp groove 32 can be closed and clamped right above the locking groove 23 through the push rod 22 and can also be loosened far away from the sliding clamp seat 2;

the height of the locking groove 23 is determined by the height of the elevating plate 31, the diameter and the size of the limiting groove 11 and the locking groove 23 of the device are customized by the round pipe fitting 4, and the depth of the limiting groove 11 and the locking groove 23 needs to ensure that the top of the horizontally placed circular tube 4 is completely submerged in the groove, so as to ensure the stable limiting, the arc diameter of the clamping groove 32 is made based on the diameter of the small round tube 41, and needs to be accurately matched with the small round tube 41, the arc surface of the clamping groove 32 is not less than a quarter of the arc surface, namely the radian is not less than 90 degrees, preferably an angle of 120 degrees, and the top of the clip groove 32 is beyond the vertical axis of the small round tube 41 by an angle of 10, i.e. the angle m shown in fig. 7 is 5, the radian of the whole clamping groove 32 is 120 degrees, namely the n angle is 120 degrees, and the arc surface of the m angle belongs to the range of the arc surface of the n angle.

Still need install screens board 33 in one side of pressing from both sides groove 32, screens board 33 is sheltered from in one side of pressing from both sides groove 32, is used for leaning on little pipe 41, and the pipe 41 can all be in same position at every turn when putting to pipe 4 in the little pipe of being convenient for to avoid little pipe 41 slippage when the chucking.

Finally, when all the accessories are installed and matched, the highest point of the clamping groove 32, namely the vertical radius of the arc surface of the clamping groove 32, needs to be parallel to the axes of the small circular tube 41, the circular tube 4 and the locking groove 23 on the same vertical plane, so that the parallelism of the axes of the small circular tube 41 and the circular tube 4 during welding can be guaranteed, and the two circular tubes after final welding are smoothly butted.

During manufacturing, the shortest distance from the highest point of the top of the clamping groove 32 to the locking groove 23 is the sum of the diameters of the small circular tube 41 and the circular tube 4, namely, in a clamping state, the vertical linear distance between the highest point of the clamping groove 32 and the locking groove 23 needs to be matched with the sizes of the small circular tube 41 and the circular tube 4, no gap exists, the butt joint state is guaranteed to be completely tight, the welding state is the tightest, the size is the most accurate, the device is limited, expansion cannot occur displacement, and no space exists through size limitation and contraction.

When the utility model is used, a circular pipe 4 which needs to be welded and is thicker is horizontally placed in two support frames 1 and a sliding clamping seat 2, the outer wall of the circular pipe 4 is ensured to be stably clamped with a limiting groove 11 of the support frames 1, the outer wall of the circular pipe 4 is also required to be stably placed in a locking groove 23, then a rapid clamp 12 is controlled to clamp the circular pipe 4 in the limiting groove 11, the circular pipe 4 cannot be horizontally moved and slid or rotated, a clamping head of the rapid clamp 12 is provided with an anti-skidding rubber pad which has anti-skidding and locking functions, then a small circular pipe 41 is arranged in a clamping groove 32 in preparation, then a push rod 22 is pulled, the push rod 22 pulls a sliding rod 21 slowly, so that the sliding clamping plate 3 is pulled to be close to the sliding clamping seat 2, the clamping groove 32 is continuously close to the top of the arranged circular pipe 4, and the small circular pipe 41 is attached to an arc on the inner wall of the clamping groove 32, one end of the small circular tube 41 is abutted against the clamping plate 33, then the sliding rod 21 is pulled continuously through the push rod 22, the sliding clamp plate 3 is gradually clamped on the circular tube 4, so that the small circular tube 41 is clamped on the top of the circular tube 4, because the arc surface n of the clamping groove 32 has an angle of 120 degrees, the small circular tube 41 is wrapped from the outer side, the inner side also has an arc for abutting against the small circular tube 41, the radian m exceeding the outer side is 10 degrees, the small circular tube 41 can not be loosened outwards enough to be limited, the inner side exceeds the horizontal axis, namely, an angle of 20 degrees is formed below the horizontal diameter to limit the small circular tube 41 not to be fixed downwards, namely, the clamping groove 32 is arranged in the range of three quadrants on the cross section of the whole circle to limit the small circular tube 41, so that the small circular tube 41 can not be displaced, when the sliding clamp plate 3 clamps the small circular tube 41 on the top of the circular tube 4, the locking groove 23 is just right, Little pipe 41, pipe spare 4 and clamp groove 32 are arranged by lower to last time, and all axes are parallel to each other in the vertical plane simultaneously, can begin to weld this moment, two pipes are in the inseparable locking state of coincide this moment, and the cross section of two pipes is tangent this moment, can not take place to warp during the welding, can not take place the displacement yet, after the welding is accomplished, the welding seam cooling, then take out welded little pipe 41 and pipe spare 4, if need all weld, just trade one side welding completion's work piece again and continue the centre gripping, weld once more, just so accomplished welding, promote push rod 22 when taking out, the slip splint 3 is separately with the slip holder 2 about, then loosen quick clamp 12, just can be convenient take out welding completion's little pipe 41 and pipe spare 4, the welding is accomplished.

Although specific embodiments of the utility model have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the utility model, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the utility model, which is to be limited only by the appended claims.

Claims (7)

1. A limiting clamp for welding round pipes comprises a small round pipe (41) and a round pipe fitting (4);

its characterized in that, limit clamp includes: the supporting frame (1) is a base for stably supporting the round pipe fitting (4), and the top of the supporting frame is provided with a limiting groove (11);

at least two support frames (1) are erected on the same working surface, and the axes of the limiting grooves (11) of the two support frames (1) are the same straight line;

the sliding clamping seat (2) is a base for stably erecting the round pipe fitting (4) and is erected between the two supporting frames (1), the top of the sliding clamping seat is provided with an open locking groove (23), the two ends of the locking groove (23) penetrate through the front side and the rear side of the sliding clamping seat (2),

a sliding rod (21) is arranged at the bottom of the sliding clamping seat (2) in a sliding mode, and the sliding rod (21) is driven to horizontally slide at the bottom of the sliding clamping seat (2) through a pushing rod (22);

the locking grooves (23) of the sliding clamping seat (2) have the same axis with the limiting grooves (11) of the two support frames (1);

the sliding clamp plate (3) is arranged at one end of the sliding rod (21) through a fixed frame, a circular arc-shaped clamp groove (32) is formed in the bottom of one vertical side wall, and the diameter of the arc surface of the clamp groove (32) is the same as that of a welded small circular tube (41); the small round pipe (41) can be separately clamped on the top of the round pipe piece (4) through the clamping groove (32) of the sliding clamping plate (3);

when the small round pipe (41) is clamped on the round pipe fitting (4) by the clamping groove (32), the axes of the clamping groove (32), the small round pipe (41), the round pipe fitting (4) and the locking groove (23) are parallel to each other and are positioned on the same vertical plane.

2. The limit clamp for round pipe welding according to claim 1, wherein: the limiting groove (11) is a U-shaped groove with an opening at the top, the bottom of the limiting groove (11) is semicircular, the circular arc at the bottom of the limiting groove (11) is in clearance fit with the side wall of the round pipe fitting (4), and the clearance is not more than 0.2 mm;

the limiting groove (11) penetrates through the support frame (1) in the front-back direction.

3. The limit clamp for round pipe welding according to claim 1, wherein: the shape and the size of each support frame (1) are the same, the size and the shape of the limiting groove (11) formed in the support frame are also the same, at least one quick clamp (12) is erected above the limiting groove (11), and the round pipe fitting (4) can be clamped in the limiting groove (11) through the quick clamp (12) in a separable mode.

4. The limit clamp for round pipe welding according to claim 1, wherein: the top edge of the clamping groove (32) is positioned right above the horizontal axis of the inner circular arc of the clamping groove (32);

an elevating plate (31) is vertically fixed at one end of the sliding rod (21), the sliding clamp plate (3) is horizontally fixed at the top of the elevating plate (31), the angle of an inner arc surface of the clamping groove (32) is not less than 90 degrees, and a vertical side wall of the sliding clamp plate (3) above one side of the clamping groove (32) exceeds a vertical surface covered with the axis of the small circular tube (41);

the clamping groove (32) does not shield the contact surface of the small round pipe (41) and the round pipe fitting (4);

when the clamping groove (32) is located at a clamping station right above the locking groove (23), the shortest distance from the highest point of the arc surface of the clamping groove (32) to the locking groove (23) is the sum of the diameters of the small round pipe (41) and the round pipe fitting (4).

5. The limit clamp for round pipe welding according to claim 1, wherein: a clamping plate (33) is further arranged on the rear side face of the sliding clamping plate (3), the clamping plate (33) is a vertical flat plate, and the clamping plate (33) blocks an opening at the rear end of the clamping groove (32);

the screens board (33) are located little circular tube (41) top, the vertical minimum interval at screens board (33) and little circular tube (41) top is between 2-5 mm.

6. The limit clamp for round pipe welding according to claim 1, wherein: the sliding rod (21) and the groove at the top of the sliding clamping seat (2) do not interfere with each other;

the sliding direction of the sliding rod (21) is vertical to the projection of the axis of the groove at the top of the sliding clamping seat (2) on the same horizontal plane;

the sliding direction of the sliding rod (21) and the axis of the groove at the top of the sliding clamping seat (2) are both horizontally arranged.

7. The limit clamp for round pipe welding according to claim 1, wherein: the push rod (22) is a linear telescopic manual push rod or a hydraulic push rod.

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