CN113601052B - Short pipe fixing tool suitable for automatic welding - Google Patents

Abstract

The invention discloses a short pipe fixing tool suitable for automatic welding, which comprises: the outer diameter of the round pipe is not smaller than the minimum clamping diameter of a clamp of the pipeline welding robot, at least three supporting rods are connected to the outer pipe wall at one end of the round pipe, the supporting rods are arranged along the radial direction of the round pipe, and the at least three supporting rods are distributed at equal central angle intervals; the supporting blocks are the same in number with the supporting rods, each supporting block is correspondingly arranged at the tail end of one supporting rod, square through holes are radially formed in the supporting blocks along the circular tubes, square tubes capable of freely penetrating and moving are arranged in the square through holes in a penetrating mode, first threaded holes penetrating through the supporting blocks are further formed in the side faces of the supporting blocks, and first lead screws matched with the first lead screws are arranged in the first threaded holes and used for tightly supporting the square tubes. The invention can quickly extend the short pipe concentrically and can better realize the intelligent welding of the short pipe.

Description

Short pipe fixing tool suitable for automatic welding

Technical Field

The invention relates to the field of pipeline welding. More particularly, the present invention relates to a spool fixing tool suitable for automated welding.

Background

The pipeline welding robots popular in the market at present are divided into two types, one type is pipeline fixing, and a gun head rotates around a welding seam for welding. The other is that the pipeline rotates, and the gun head is fixed in the 12 o' clock direction. Compared with the two methods, the welding robot with the rotating gun head cannot be compared with the welding robot with the fixed gun head in terms of welding parameters, actual operation and stability due to the continuous change of the welding method, the welding robot with the fixed gun head is generally used for manufacturing large-scale factory pipelines, however, the length of the manufactured shortest pipeline needs to be larger than the shortest distance from a clamp to a welding gun (as shown in fig. 1) due to the fact that the pipeline needs to rotate, and the shortest distance from the clamp to the welding gun limits the intelligent welding of short pipes with the length smaller than the shortest distance from the clamp to the welding gun.

Disclosure of Invention

An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.

The invention also aims to provide a short pipe fixing tool for automatic welding, which can quickly concentrically extend the short pipe and can better realize the intelligent welding of the short pipe.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a short tube fixing tool adapted for automatic welding, comprising:

the outer diameter of the round pipe is not smaller than the minimum clamping diameter of a clamp of the pipeline welding robot, at least three supporting rods are connected to the outer pipe wall at one end of the round pipe, the supporting rods are arranged along the radial direction of the round pipe, and the at least three supporting rods are distributed at equal central angle intervals;

the supporting blocks are the same in number with the supporting rods, each supporting block is correspondingly arranged at the tail end of one supporting rod, square through holes are radially formed in the supporting blocks along the circular tubes, square tubes capable of freely penetrating and moving are arranged in the square through holes in a penetrating mode, first threaded holes penetrating through the supporting blocks are further formed in the side faces of the supporting blocks, and first lead screws matched with the first lead screws are arranged in the first threaded holes and used for tightly supporting the square tubes.

Preferably, all the struts are the same in length, all the square tubes are the same in length, the square tubes are provided with scales along the length direction, and starting points of the scales are arranged at one ends, far away from the circular tubes, of the square tubes.

Preferably, the scales are arranged on the outer pipe wall of the square pipe facing the other end of the circular pipe.

Preferably, one end of the square pipe, which is far away from the circular pipe, is provided with a first cambered plate, and the concave surface of the first cambered plate faces the square pipe.

Preferably, square pipe is kept away from the one end cover of pipe is connected with first end plate, first end plate center is provided with the second screw hole, be provided with the second lead screw that matches with it in the second screw hole, the second lead screw is located the part rigid coupling outside the square pipe has first nut to twist soon the second lead screw conveniently, the second lead screw is located the tip outside the square pipe is provided with first elastic metal piece, first elastic metal piece deviates from the face of square pipe is pasted and is had first rubber skid resistant course.

Preferably, the square pipe is close to one end of the circular pipe is provided with a second cambered plate, and a convex surface of the second cambered plate faces the square pipe.

Preferably, square pipe is close the one end cover of pipe is connected with the second end plate, second end plate center is provided with the third screw hole, be provided with the third lead screw that matches with it in the third screw hole, the third lead screw is located the part rigid coupling outside the square tube has the second nut to conveniently twist soon the third lead screw, the third lead screw is located the tip outside the square tube is provided with second elastic metal piece, and second elastic metal piece both ends are all curled to the middle part, just the convex surface orientation of second elastic metal piece square pipe, the second elastic metal piece deviates from the face facing of square pipe has second rubber skid resistant course.

Preferably, the lengths of all the supporting rods are the same, each supporting block is rotatably connected with a tray, and the transmitting end of a photoelectric distance meter is fixed on each tray;

when one end of the square tube, which is far away from the round tube, is propped against the inner wall of the short tube to be welded so that the short tube and the round tube are coaxial, the transmitting end is configured to vertically shoot towards the inner wall of the short tube, and a reflecting end opposite to the transmitting end of each photoelectric distance meter is arranged on the inner wall of the short tube, or when one end of the square tube, which is close to the round tube, is propped against the outer wall of the short tube to be welded so that the short tube and the round tube are coaxial, the transmitting end is configured to vertically shoot towards the outer wall of the short tube, and a reflecting end opposite to the transmitting end of each photoelectric distance meter is arranged on the outer wall of the short tube;

the short tube fixing tool further comprises: and the control unit is respectively connected with all the photoelectric distance measuring instruments and used for receiving the measured distance value of each photoelectric distance measuring instrument, when the difference between the measured distance value of any one photoelectric distance measuring instrument and the measured distance values of other photoelectric distance measuring instruments is larger than a preset threshold value, the control unit sends out a first alarm signal, and the control unit is also used for sending out a second alarm signal when the measured distance value is not fed back by any one photoelectric distance measuring instrument.

The invention at least comprises the following beneficial effects: by arranging the supporting block and the square tube, the square tube is enabled to prop against the short tube to be welded, the length of the square tube extending out of the supporting block is adjusted until the short tube is coaxial with the round tube, the square tube is fixed by the first screw rod, the short tube to be welded can be fixed by the square tube, the coaxial extension of the short pipe and the circular pipe is realized, and then the circular pipe is clamped on the clamp of the pipeline welding robot, so that the normal welding of the short pipe can be realized. Simultaneously, because square pipe can freely alternate the activity in square through hole, so when needs fixed nozzle stub internal diameter in location is great, adjustable square pipe removes to the direction of keeping away from the pipe, the one end shore nozzle stub inner wall that the pipe was kept away from to the evolution pipe, when needs fixed nozzle stub external diameter in location is less, adjustable square pipe removes to the direction that is close to the pipe, the evolution pipe is close to the one end shore nozzle stub outer wall of pipe, can fix a position fixedly like this to the nozzle stub of different diameter size, wide application.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic structural diagram of a pipeline welding robot according to the present invention;

FIG. 2 is a top view of the spool fixing tool for automated welding according to the present invention;

FIG. 3 isbase:Sub>A side view of the A-A surface of the short tube fixing tool for automatic welding according to the present invention;

FIG. 4 is a top view of a spool detacher adapted to perform automated welding in accordance with another embodiment of the present invention;

FIG. 5 is a top view of a spool detacher adapted for automated welding, in accordance with yet another embodiment of the present invention.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 2 to 3, the present invention provides a short tube fixing tool suitable for automatic welding, which comprises:

the outer diameter of the circular tube 1 is not smaller than the minimum clamping diameter of a clamp of the pipeline welding robot, the outer tube wall at one end of the circular tube 1 is connected with at least three supporting rods 2, the supporting rods 2 are arranged along the radial direction of the circular tube 1, and the at least three supporting rods 2 are distributed at equal central angles at intervals;

the tray 3, its quantity with 2 quantity of branch are the same, and each tray 3 corresponds and sets up in 2 ends on a branch, follow on the tray 3 square through hole has radially been seted up to pipe 1, wear to be equipped with the square pipe 4 that can freely alternate the activity in the square through hole, the side of tray 3 has still seted up and has run through extremely square through hole's first screw hole, be provided with the first lead screw 5 that matches with it in the first screw hole for the top is tight square pipe 4.

Specifically, the round tube 1 is a stainless steel tube with a diameter of 168mm and a length of 500mm, the number of the support rods 2 is three, three support rods 2120 are welded on the outer tube wall of one end of the round tube 1 at equal intervals, the length of the three support rods 2 is the same, three 100 × 60 × 50mm rectangular support blocks 3 are welded at the tail ends of the three support rods 2 respectively, ideally, the support rods 2 are right on the center line of the surface of the support block 3 connected with the support blocks, a 35 × 55mm square through hole is drawn out from the center of each support block 3 along the radial direction of the round tube 1, three 30 × 50mm square tubes 4 are respectively and freely inserted into and move in the three square through holes, a 20mm first threaded hole is drilled in one side of each support block 3, three 20mm first lead screws are respectively inserted into the three first threaded holes, and the square tubes 4 on each support block 3 are fixed respectively. Of course, the length of the circular tube 1 is only described as an example, and in practical application, the length of the circular tube 1 needs to be adaptively adjusted according to the length of the short tube to be welded, so that the length of the short tube fixing tool after being coaxially connected with the short tube is larger than the shortest distance between the clamp of the pipeline welding robot and the welding gun.

When the embodiment is used, the axis of the short pipe to be welded is horizontally placed on a horizontal plane, if the inner diameter of the short pipe is larger, the short pipe fixing tool extends into the short pipe from the pipe orifice at one end of the short pipe, the square pipe 4 is moved firstly, one end, away from the circular pipe 1, of the square pipe 4 props against the inner wall of the short pipe, the first screw rod 5 is screwed in slightly, the first screw rod 5 props against the square pipe 4, the square pipe 4 cannot automatically slide due to gravity, the length, extending out of the supporting block 3, of each square pipe 4 is carefully adjusted, the length, away from the circular pipe 1, of one end, away from the circular pipe 1, of the three square pipes 4 is the same as the length, the circular pipe 1 is coaxial with the short pipe, and the first screw rod 5 is screwed at the moment; if this nozzle stub external diameter is less, then press from both sides the region with the one end that nozzle of nozzle stub one end opposite direction three square pipes 4 are close to pipe 1, remove square pipe 4 earlier, the one end that lets square pipe 4 be close to pipe 1 withstands the nozzle stub outer wall, the first lead screw 5 of screw in a little, let first lead screw 5 support square pipe 4, do not make square pipe 4 slide because of gravity is automatic, carefully adjust the length that every square pipe 4 stretches out from tray 3 again, the length that the one end that three square pipes 4 kept away from pipe 1 stretches out from tray 3 is the same, it is coaxial with this nozzle stub to explain pipe 1, screw first lead screw 5 this moment and can.

In the embodiment, the yielding pipe 4 is abutted against the short pipe to be welded, the length of the square pipe 4 extending out of the support block 3 is adjusted until the short pipe is coaxial with the circular pipe 1, the square pipe 4 is fixed by the first screw rod 5, the short pipe to be welded can be fixed by the square pipe 4, the coaxial extension of the short pipe and the circular pipe 1 is realized, the circular pipe 1 is clamped on a clamp of the pipeline welding robot, and the short pipe can be normally welded. Simultaneously, because square pipe 4 can freely alternate the activity in square through hole, so when the fixed nozzle stub internal diameter of needs location is great, adjustable square pipe 4 removes to the direction of keeping away from pipe 1, the one end shore nozzle stub inner wall that pipe 1 was kept away from to abduction pipe 4, when the fixed nozzle stub external diameter of needs location is less, adjustable square pipe 4 removes to the direction that is close to pipe 1, abduction pipe 4 is close to the one end shore nozzle stub outer wall of pipe 1, can fix a position fixedly to the nozzle stub of different diameter sizes like this, and wide application.

In another embodiment, all the support rods 2 have the same length, all the square tubes 4 have the same length, the square tubes 4 are provided with scales along the length direction, and the starting points of the scales are arranged at one ends, far away from the circular tube 1, of the square tubes 4. When the welding device is used, the length reading of the support block 3 extending out of one end of the round tube 1 is far away from the square tube 4, and when the length reading of the support block 3 extending out of the three square tubes 4 is consistent, the round tube 1 is coaxial with a short tube needing to be welded. In this embodiment, need not the length that the square pipe 4 stretches out the tray 3 of visual observation, directly judge through the scale reading, it is more swift accurate.

In another embodiment, the scale set up in square pipe 4 faces on the outer pipe wall of 1 other end of pipe, because when the great nozzle stub of above-mentioned nozzle stub coaxial coupling internal diameter, square pipe 4 has visited inside the nozzle stub, so set up the scale in other positions of square pipe 4 outer pipe wall, all inconvenient readings, consequently, set up the scale in this embodiment square pipe 4 faces on the outer pipe wall of 1 other end of pipe.

In another embodiment, as shown in fig. 4, a first cambered plate 6 is arranged at one end of the square tube 4 away from the circular tube 1, and the concave surface of the first cambered plate 6 faces the square tube 4. This embodiment is when using, when needs welded nozzle stub internal diameter is great, square pipe 4 keeps away from the line contact of the one end of pipe 1 and nozzle stub inner wall just changes into the face contact of first cambered plate 6 and nozzle stub inner wall, and the contact surface grow is connected more firmly, can adjust as required according to the nozzle stub internal diameter as to the camber of first cambered plate 6.

In another embodiment, as shown in fig. 5, one end of the square tube 4, which is far away from the circular tube 1, is covered and connected with a first end plate 7, a second threaded hole is formed in the center of the first end plate 7, a second lead screw 8 matched with the second threaded hole is arranged in the second threaded hole, a first nut 9 is fixedly connected to the part, which is located outside the square tube 4, of the second lead screw 8 so as to conveniently screw the second lead screw 8, a first elastic metal sheet 10 is arranged at the end, which is located outside the square tube 4, of the second lead screw 8, and a first rubber anti-slip layer 11 is attached to the surface, which is far away from the square tube 4, of the first elastic metal sheet 10.

Since the first cambered plate 6 is used in the former embodiment, although the contact surface between the short pipe fixing tool and the short pipe to be welded is increased, the first cambered plate 6 is fixed in size and still is not suitable for short pipes with other inner diameters. Therefore, the above embodiment is improved by providing the first end plate 7, the second lead screw 8, the first elastic metal sheet 10 and the first anti-slip rubber layer 11, and when the above embodiment is used, a tool is used to screw the first nut 9 so that the first anti-slip rubber layer 11 on the second lead screw 8 is pressed against the inner wall of the short pipe until the first anti-slip rubber layer 11 completely fits the inner wall of the short pipe, and the second lead screw 8 cannot be screwed out continuously. Because first elastic metal piece 10 and first rubber skid resistant course 11 all have elasticity, so all can be out of shape under the effect of second lead screw 8 and form the curved surface that is fit for different internal diameter nozzle stub inner walls, the applicable face is more extensive, in addition, when first elastic metal piece 10 forms the curved surface under the effect of second lead screw 8, because first elastic metal piece 10 has the trend of replying the plane state after warping, make first elastic metal piece 10 produce pressure to first rubber skid resistant course 11, and then strengthened nozzle stub mounting tool and need welded short intervascular frictional force, make the connection between nozzle stub mounting tool and the nozzle stub more firm.

In another embodiment, as shown in fig. 4, a second cambered plate 12 is disposed at one end of the square tube 4 close to the circular tube 1, and a convex surface of the second cambered plate 12 faces the square tube 4. When the embodiment is used, when the outer diameter of the short pipe needing to be welded is smaller, the square pipe 4 is close to the line contact between one end of the round pipe 1 and the outer wall of the short pipe and is converted into the surface contact between the second cambered plate 12 and the outer wall of the short pipe, the contact surface is enlarged and connected more firmly, and the curvature of the second cambered plate 12 can be adjusted according to the outer diameter of the short pipe according to the requirement

In another embodiment, as shown in fig. 5, the square tube 4 is close to one end of the circular tube 1 is covered and connected with a second end plate 13, a third threaded hole is formed in the center of the second end plate 13, a third screw rod 14 matched with the third threaded hole is arranged in the third threaded hole, the third screw rod 14 is located at the outer part of the square tube 4 and fixedly connected with a second nut, so that the third screw rod 14 is conveniently screwed, the third screw rod 14 is located at the outer end part of the square tube 4 and provided with a second elastic metal sheet 15, two ends of the second elastic metal sheet 15 are curled towards the middle part, a convex surface of the second elastic metal sheet 15 faces towards the square tube 4, and the second elastic metal sheet 15 deviates from the surface of the square tube 4 and is adhered with a second rubber anti-slip layer 16.

Since the second cambered plate 12 is used in the previous embodiment, although the contact surface between the short pipe fixing tool and the short pipe to be welded is increased, the second cambered plate 12 is fixed in size and still is not suitable for short pipes with other outer diameters. Therefore, the above embodiment is improved by providing the second end plate 13, the third lead screw 14, the second elastic metal sheet 15 and the second rubber anti-slip layer 16, when the above embodiment is used, a tool is used to screw the second nut to make the second rubber anti-slip layer 16 on the third lead screw 14 close to the outer wall of the short pipe, the curled second elastic metal sheet 15 is broken off, so that a part of the second rubber anti-slip layer 16 is tightly attached to the outer wall of the short pipe, and then the second nut is continuously screwed until the second rubber anti-slip layer 16 is completely attached to the outer wall of the short pipe, and the third lead screw 14 cannot be continuously screwed out. Because second elastic metal piece 15 and second rubber skid resistant course 16 all have elasticity, so all can be out of shape under the effect of third lead screw 14 and form the curved surface that is fit for different external diameter nozzle stub outer walls, the applicable face is more extensive, in addition, second elastic metal piece 15 forms the curved surface that is fit for the nozzle stub outer wall under the effect of third lead screw 14, because there is the trend of replying initial crimping state after second elastic metal piece 15 warp, make second elastic metal piece 15 produce pressure to second rubber skid resistant course 16, and then strengthened nozzle stub fixing tool and the frictional force between the nozzle stub that needs the welding, make the connection between nozzle stub fixing tool and nozzle stub more firm.

In another embodiment, as shown in fig. 2, at least three support rods 2 have the same length, each support block 3 is rotatably connected with a tray 17, and a transmitting end 18 of an optoelectronic distance measuring instrument is fixed on the tray 17;

specifically, because above-mentioned nozzle stub fixing tool is when using, the face of tray 3 back to branch 2 is being closer to the nozzle stub that needs the welding along 1 axial direction of pipe, so tray 17 sets up on the face of tray 3 back to branch 2, and tray 17 can be with the rotation connected mode of tray 3: the surface of the support block 3, which is opposite to the support rod 2, is provided with a blind hole which does not penetrate through the square through hole, a rotating shaft is arranged in the blind hole, the tail end of the rotating shaft is coaxially connected with a tray 17, and an emitting end 18 of the photoelectric distance measuring instrument is fixed on the tray 17 through adhesive tape.

When one end of the square tube 4, which is far away from the circular tube 1, is propped against the inner wall of the short tube to be welded so that the short tube and the cylinder are coaxial, the transmitting end 18 is configured to vertically shoot towards the inner wall of the short tube, and a reflecting end 19 opposite to the transmitting end 18 of each photoelectric distance meter is arranged on the inner wall of the short tube, or when one end of the square tube 4, which is close to the circular tube 1, is propped against the outer wall of the short tube to be welded so that the short tube and the cylinder are coaxial, the transmitting end 18 is configured to vertically shoot towards the outer wall of the short tube, and a reflecting end 19 opposite to the transmitting end 18 of each photoelectric distance meter is arranged on the outer wall of the short tube;

the short pipe fixing tool further comprises: and the control unit is respectively connected with all the photoelectric distance measuring instruments and used for receiving the measured distance value of each photoelectric distance measuring instrument, when the difference between the measured distance value of any photoelectric distance measuring instrument and the measured distance values of other photoelectric distance measuring instruments is greater than a preset threshold value, the control unit sends out a first alarm signal, and the control unit is also used for sending out a second alarm signal when the measured distance value is not fed back by any photoelectric distance measuring instrument.

Preferably, the control unit is in communication connection with a control center of the pipeline welding robot, and directly sends the first alarm signal and/or the second alarm signal to the control center of the pipeline welding robot, so that the control center of the pipeline welding robot stops welding after receiving the first alarm signal and/or the second alarm signal, and naturally, an alarm lamp and a buzzer can be additionally arranged, the control unit is also respectively connected with the alarm lamp and the buzzer, so that the alarm lamp starts flashing after receiving the first alarm signal and/or the second alarm signal, and the buzzer lamp starts ringing after receiving the first alarm signal and/or the second alarm signal.

Because preceding embodiment is when using, after needs welded nozzle stub and pipe 1 are adjusted to coaxial, again with 1 centre gripping of pipe on pipeline welding robot's the clamp, the nozzle stub carries out normal welding, the nozzle stub rotates along with pipe 1 and clamp in welding process, however, if the connection between nozzle stub and square pipe 4 is not hard up in welding process, will lead to nozzle stub off-centre, the nozzle stub does not rotate along with pipe 1 and clamp simultaneously also probably appears, perhaps rotate hysteresis, these several kinds of situations all can lead to the welding accident, need to reweld, it takes a lot of labour and time.

Therefore, the short tube fixing tool in the previous embodiment is improved by the embodiment, and the photoelectric distance measuring instrument and the control unit are additionally arranged. When the embodiment is used, under the initial condition, the short pipe is coaxial with the circular pipe 1, the distance values measured by all the photoelectric distance meters are basically the same, at the moment, the difference between the measured distance value of any one electric distance meter and the measured distance values of other photoelectric distance meters is basically zero, or within the range of a preset threshold value (+/-alpha, alpha value is adjusted according to the outer diameter of the short pipe), when the short pipe is eccentric, the distance between part of the photoelectric distance meters and the short pipe is increased, the distance between part of the photoelectric distance meters and the short pipe is decreased, if the difference between the measured distance value of any one electric distance meter and the measured distance values of other photoelectric distance meters is larger than the preset threshold value, people can judge that the short pipe is eccentric, welding needs to be stopped immediately, and accident enlargement is avoided. In addition, in the initial situation, each of the photoelectric distance measuring instruments has an emitting end 18 opposite to the reflection section, and if any one of the photoelectric distance measuring instruments does not feed back the measured distance value, it indicates that the short pipe does not rotate together with the circular pipe 1 and the clamp, so that the emitting end 18 of the photoelectric distance measuring instrument is not opposite to the reflection section, and therefore it can be determined that the short pipe does not rotate or rotates late, and welding needs to be stopped immediately, so that the accident is prevented from being enlarged.

According to the embodiment, the coaxiality and the rotation condition of the short pipe in the welding process are detected by arranging the photoelectric distance measuring instrument and the control unit, so that the welding process of the short pipe is well monitored, the problem can be fed back at the first time, and the accident expansion is avoided.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (5)

1. Short pipe fixing tool suitable for automatic welding, its characterized in that includes:

the outer diameter of the round pipe is not smaller than the minimum clamping diameter of a clamp of the pipeline welding robot, at least three supporting rods are connected to the outer pipe wall at one end of the round pipe, the supporting rods are arranged along the radial direction of the round pipe, and the at least three supporting rods are distributed at equal central angle intervals;

the supporting blocks are the same in number as the supporting rods, each supporting block is correspondingly arranged at the tail end of one supporting rod, square through holes are radially formed in the supporting blocks along the circular tube, square tubes capable of freely penetrating and moving are arranged in the square through holes in a penetrating mode, first threaded holes penetrating through the square through holes are further formed in the side faces of the supporting blocks, and first screw rods matched with the first threaded holes are arranged in the first threaded holes and used for tightly propping the square tubes;

the end, far away from the round pipe, of the square pipe is connected with a first end plate in a covering mode, a second threaded hole is formed in the center of the first end plate, a second lead screw matched with the first threaded hole is arranged in the second threaded hole, a first nut is fixedly connected to the part, located outside the square pipe, of the second lead screw so as to facilitate screwing of the second lead screw, a first elastic metal sheet is arranged at the end, located outside the square pipe, of the second lead screw, and a first rubber anti-slip layer is attached to the surface, far away from the square pipe, of the first elastic metal sheet;

one end of the square pipe, which is close to the circular pipe, is provided with a second cambered plate, and the convex surface of the second cambered plate faces the square pipe;

the side pipe is close the one end cover of pipe is connected with the second end plate, second end plate center is provided with the third screw hole, be provided with the third lead screw that matches with it in the third screw hole, the third lead screw is located the part rigid coupling outside the square tube has the second nut to the third lead screw is twisted soon to the convenience, the third lead screw is located the tip outside the square tube is provided with second elastic metal piece, second elastic metal piece both ends all curl to the middle part, just the convex surface orientation of second elastic metal piece the side pipe, second elastic metal piece deviates from it has second rubber skid resistant course to paste on the face of side pipe.

2. A short pipe fixing tool suitable for automatic welding according to claim 1, wherein the length of all the struts is the same, the length of all the square pipes is the same, the square pipe is provided with a scale along its length direction, and the starting point of the scale is arranged at one end of the square pipe far away from the circular pipe.

3. A short tube fixing tool suitable for automatic welding according to claim 2, characterized in that the scale is arranged on the outer tube wall of the square tube facing the other end of the circular tube.

4. A short tube fixing tool suitable for automatic welding according to claim 1, wherein one end of the square tube away from the circular tube is provided with a first cambered plate, and the concave surface of the first cambered plate faces the square tube.

5. A short pipe fixing tool suitable for automatic welding according to claim 1, wherein all the struts have the same length, each support block is rotatably connected with a tray, and the emitting end of an optoelectronic distance measuring instrument is fixed on the tray;

when one end of the square tube, which is far away from the round tube, is propped against the inner wall of the short tube to be welded so that the short tube and the round tube are coaxial, the transmitting end is configured to vertically shoot towards the inner wall of the short tube, and a reflecting end opposite to the transmitting end of each photoelectric distance meter is arranged on the inner wall of the short tube, or when one end of the square tube, which is close to the round tube, is propped against the outer wall of the short tube to be welded so that the short tube and the round tube are coaxial, the transmitting end is configured to vertically shoot towards the outer wall of the short tube, and a reflecting end opposite to the transmitting end of each photoelectric distance meter is arranged on the outer wall of the short tube;

the short pipe fixing tool further comprises: and the control unit is respectively connected with all the photoelectric distance measuring instruments and used for receiving the measured distance value of each photoelectric distance measuring instrument, when the difference between the measured distance value of any photoelectric distance measuring instrument and the measured distance values of other photoelectric distance measuring instruments is greater than a preset threshold value, the control unit sends out a first alarm signal, and the control unit is also used for sending out a second alarm signal when the measured distance value is not fed back by any photoelectric distance measuring instrument.

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