CN210703398U

CN210703398U - Pipeline welding positioning device

Info

Publication number: CN210703398U
Application number: CN201921283386.6U
Authority: CN
Inventors: 田晓燕; 赵高楷; 赵综凯; 李泓锐; 赵海朝
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2019-08-09
Filing date: 2019-08-09
Publication date: 2020-06-09
Anticipated expiration: 2029-08-09

Abstract

The utility model provides a pipeline welding positioner relates to pipeline welding auxiliary assembly technical field. The utility model provides a pipeline welding position device, include: the device comprises a support frame, a sliding sleeve and a clamping mechanism; the supporting frame comprises a frame and supporting legs for supporting the frame, the frame comprises cross beams arranged oppositely and longitudinal beams arranged oppositely, and two ends of each longitudinal beam are fixed to the two cross beams respectively; the pipeline butt-joint device is characterized in that a sliding sleeve is arranged on the longitudinal beam in a sliding mode, the sliding sleeve is connected with the clamping machine, the clamping mechanism is used for clamping a pipeline, the position of the pipeline is changed by adjusting the position of the sliding sleeve on the longitudinal beam, the butt-joint precision of the pipeline is improved, and the welding quality of the pipeline is improved.

Description

Pipeline welding positioning device

Technical Field

The utility model relates to a pipeline welding positioner relates to pipeline welding auxiliary assembly technical field.

Background

Oil gas has become an important energy source, and the oil gas that directly exploits through oil recovery equipment need be transported to the assigned position as usable energy, uses pipeline transportation oil gas to be the most reliable transportation mode, at present, adopts multistage pipeline concatenation welding dress as the transportation pipeline of oil gas.

Among the prior art, the pipeline both ends that need to weld need align through artifical manually operation before the dress is welded in the concatenation of multistage pipeline, and manually operation hardly guarantees the pipeline and aligns to the interface, leads to the pipeline after the welding to misplace great to the interface, is difficult to guarantee transport pipeline welding quality.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pipeline welding position device for solve the above-mentioned defect among the prior art, through adopting the position of pipeline welding position device adjusting pipe way of this application, improved the alignment precision of treating welded pipe way, improved the welding quality of pipeline effectively.

The utility model provides a pipeline welding position device, include: the device comprises a support frame, a sliding sleeve and a clamping mechanism;

the supporting frame comprises a frame and supporting legs for supporting the frame, the frame comprises cross beams arranged oppositely and longitudinal beams arranged oppositely, and two ends of each longitudinal beam are fixed to the two cross beams respectively;

the longitudinal beam is provided with the sliding sleeve in a sliding mode, the clamping mechanism is connected with the sliding sleeve, and the clamping mechanism is used for clamping a pipeline.

Optionally, the clamping mechanism further comprises a telescopic piece, and the clamping mechanism is connected with the sliding sleeve through the telescopic piece.

Optionally, the telescopic part is a hydraulic cylinder, a cylinder barrel of the hydraulic cylinder is fixed to the sliding sleeve, and a hydraulic rod of the hydraulic cylinder is fixed to the clamping mechanism.

Optionally, the sliding sleeve comprises: the screw rod is arranged on the longitudinal beam, and the sliding block is in threaded connection with the screw rod.

Optionally, a groove is formed in the longitudinal beam, and the screw is installed in the groove.

Optionally, the sliding block is sleeved on the longitudinal beam, and a part of the sliding block, which is in contact with the screw rod, is provided with a thread for connecting with the screw rod.

Optionally, a bearing hole for the end of the screw to pass through is formed in the cross beam, and a bearing for bearing the screw is installed in the bearing hole;

the screw is provided with a handle at least at one end.

Optionally, the clamping mechanism comprises: retaining member and two relative centre gripping arms that set up, two the link cover of centre gripping arm is established together, the retaining member is used for two the link locking of centre gripping arm.

Optionally, the inner surface of the gripping end of the gripping arm is provided with a protrusion for increasing frictional resistance.

Optionally, the bottom of the supporting foot is provided with a roller.

The utility model provides a pipeline welding position device, include: the device comprises a support frame, a sliding sleeve and a clamping mechanism; the supporting frame comprises a frame and supporting legs for supporting the frame, the frame comprises cross beams arranged oppositely and longitudinal beams arranged oppositely, and two ends of each longitudinal beam are fixed to the two cross beams respectively; the adoption is provided with the slip cap on the longeron in a sliding manner, and slip cap constructs with the gripper is connected, fixture is used for the centre gripping pipeline, changes the position of pipeline through adjusting the position of slip cap on the longeron, and radial direction's precision when can improving the pipeline butt joint has further promoted the quality that the pipeline welded the dress.

Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and other objects, features and advantages of the embodiments of the present invention will become more readily understood from the following detailed description with reference to the accompanying drawings. Embodiments of the invention will be described, by way of example and not by way of limitation, in the accompanying drawings, in which:

FIG. 1 is a schematic structural diagram of a pipe welding positioning apparatus according to an embodiment;

FIG. 2 is a schematic partial structure diagram of a support frame according to an embodiment;

FIG. 3 is a schematic structural diagram of a slider according to an embodiment;

FIG. 4 is a schematic view of a screw structure according to an embodiment;

FIG. 5 is a schematic structural diagram of a clamping mechanism according to an embodiment;

FIG. 6 is a schematic end view of another clamping mechanism provided in accordance with an embodiment;

fig. 7 is a schematic structural diagram of another pipe welding positioning device provided by the embodiment.

Reference numerals:

100: a support frame; 110: a cross beam; 120: a stringer;

130: supporting legs; 121: a groove; 111: a bearing bore;

200: a sliding sleeve; 201: a screw; 202: a handle;

203: a slider; 204: a bearing; 205: a thread;

300: a clamping mechanism; 310: a locking member; 320: a clamp arm;

321: a connecting end; 322: a clamping end; 500: a retractable member;

400: a roller; 600: a connecting rod.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

It should be understood that the following examples do not limit the order of execution of the steps of the method claimed by the present invention. The individual steps of the method of the invention can be carried out in any possible sequence and in a cyclic manner without contradiction.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

Furthermore, references to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Examples

Fig. 1 is a schematic structural diagram of a pipe welding and positioning device provided in this embodiment; fig. 2 is a schematic partial structure diagram of the supporting frame provided in this embodiment; fig. 3 is a schematic structural diagram of a slider provided in this embodiment; fig. 4 is a schematic view of a screw structure provided in this embodiment; fig. 5 is a schematic structural diagram of a clamping mechanism according to this embodiment; fig. 6 is a schematic end view of another clamping mechanism provided in this embodiment. Fig. 7 is a schematic structural diagram of another pipe welding positioning device provided in this embodiment.

Referring to fig. 1, the pipe welding and positioning device provided in this embodiment includes: a support frame 100, a sliding sleeve 200 and a clamping mechanism 300; the support frame 100 comprises a frame and support legs 130 for supporting the frame, the frame comprises cross beams 110 and longitudinal beams 120 which are oppositely arranged, and two ends of each longitudinal beam 120 are respectively fixed with the two cross beams 110; the sliding sleeve 200 is arranged on the longitudinal beam 120 in a sliding mode, the clamping mechanism 300 is connected with the sliding sleeve 200, and the clamping mechanism 300 is used for clamping a pipeline, namely, the clamping mechanism 300 is driven to move by sliding the sliding sleeve 200 on the longitudinal beam 120, so that the position of the pipeline is adjusted, and the butt joint of two sections of pipelines is realized.

Specifically, in the present embodiment, the frame may be a rectangular frame structure as shown in fig. 1, and a support structure including two cross members 110 and two longitudinal members 120 may be used. Of course, the frame may also be a polygonal structure, and may be set according to practical use, and here, this embodiment is only illustrated by a rectangular frame structure, and the form of the frame is not particularly limited.

Specifically, the beam 110 and the longitudinal beam 120 are made of strip steel plates as shown in fig. 1, but the beam 110 and the longitudinal beam 120 may have other shapes, such as cylindrical steel strips. Alternatively, the frame may be an integrally formed structure, such as a molded or cast structure, or of course, a frame structure formed by fixedly connecting the cross beam 110 and the longitudinal beam 120 by a fastener may also be used. In this embodiment, a rectangular structure formed by bending a strip-shaped steel plate is preferably used as the frame, so that the structure is simple and the cost is saved.

Specifically, in the present embodiment, as shown in fig. 1, rectangular steel bars are used as the support legs 130, and four rectangular steel bars are disposed at four corners of the rectangular frame by welding. Of course, in other examples, the support legs 130 may be any shape such as a table or a prism, and the position of the support legs 130 may be specifically set according to the actual use, for example, the support legs 130 may be respectively disposed at any position along the length direction of the cross beam 110 and the longitudinal beam 120. Similarly, the number of the support legs 130 can be set according to actual needs to ensure the stability of the support frame 100. In summary, the present embodiment does not specifically limit the arrangement form of the support leg 130.

For example, during specific manufacturing, the bar-shaped steel plates may be used as the supporting legs 130, the cross beams 110 and the longitudinal beams 120, the integral frame-type structure formed by splicing and welding a plurality of bar-shaped steel plates is used as the supporting frame 100, and the frame-type supporting frame 100 facilitates an operator to observe the position of a pipeline to be butted and also facilitates welding operation of the aligned pipeline.

Specifically, the sliding sleeves 200 are slidably disposed on the longitudinal beams 120, for example, in this embodiment, referring to fig. 1, two sliding sleeves 200 are slidably disposed on two longitudinal beams 120 of a rectangular frame, the two sliding sleeves 200 are respectively connected to one clamping mechanism 300, the two clamping mechanisms 300 are used for clamping two sections of pipes to be aligned, and by changing the relative positions of the two sliding sleeves 200, the relative positions of the two sections of pipes can be conveniently adjusted, so as to achieve alignment of the pipes.

Specifically, as shown in fig. 1, the sliding sleeve 200 may include a screw 201 disposed on the longitudinal beam 120, and a sliding block 203 threadedly coupled to the screw 201. For example, a support bracket may be provided on the longitudinal beam 120 to support the screw 102 and the slider 203 fitted over the screw 102. Of course, the screw 201 and the longitudinal beam 120 may be matched in other manners, for example, referring to fig. 2, in some examples, a groove 121 may be formed in the longitudinal beam 120, so as to mount the screw 201 in the groove 121. At this time, the sliding block 203 may be simultaneously disposed in the groove 121, or, as shown in fig. 1 and fig. 5, the sliding block 203 may be sleeved on the longitudinal beam 120, and correspondingly, a portion of the sliding block 203 contacting the screw 201 is provided with a thread 205 for connecting with the screw 201, so as to achieve the thread transmission connection between the sliding block 203 and the screw 201. That is, the screw 201 and the slider 203 sleeved on the longitudinal beam 120 are in thread transmission, and the slider 203 slides on the longitudinal beam 120 by rotating the screw 201 in the longitudinal beam groove 121.

Further, referring to fig. 2, a bearing hole 111 through which an end of the screw 201 passes is formed in the cross beam 110, and a bearing for bearing the screw 201 is installed in the bearing hole 111. Specifically, two arc holes are formed in the same end of two oppositely-arranged cross beams 110 along the length direction of the longitudinal beam 120 to serve as bearing holes 111, the central line of the two arc holes is parallel to the longitudinal beam 120, and the screw 201 is rotatably fixed on the longitudinal beam 120 by respectively installing bearings for bearing the screw 201 in the two arc holes.

For example, in the present embodiment, referring to fig. 2, an arc-shaped groove is formed on the top surface of the longitudinal beam 120 as a groove 121, and the arc-shaped groove is used for accommodating the screw 201 and also can ensure the strength of the longitudinal beam 120 itself. Optionally, the radian of the arc-shaped groove may be greater than 90 °, it is ensured that the groove 121 formed in the longitudinal beam 120 is large enough to accommodate the screw 201, and when the radian of the arc-shaped groove is large, the accommodating space of the screw 201 is large, of course, under the condition that the strength of the longitudinal beam 120 is ensured, the groove 121 may be set to any shape, for example, the groove 121 may be a rectangular groove.

In a specific manufacturing process, the groove 121 may also be formed on a side surface or a bottom surface of the longitudinal beam 120, that is, the groove 121 may be formed on any one of the side walls of the longitudinal beam 120 for accommodating the screw 201, and here, the present embodiment does not specifically limit the arrangement shape and position of the groove 121.

The sliding block 203 is arranged on the longitudinal beam 120 in a sliding manner, a through hole which is matched with the cross section shape of the longitudinal beam 120 is formed in the sliding block 203, the longitudinal beam 120 penetrates through the through hole to enable the sliding block 203 to be sleeved on the longitudinal beam 120, and the sliding block 203 is driven to slide on the longitudinal beam 120 through rotating the screw rod 201. For example, in the present embodiment, as shown in fig. 3, a rectangular parallelepiped structure with a square through hole is adopted as the slider 203 so as to fix the chucking mechanism 300 on the side wall of the slider 203 in a rectangular block shape. Of course, in other examples, a spherical structure may also be used as the slider 203, and here, the form of the slider is not specifically limited in this embodiment.

Further, the screw 201 is provided with a handle 202 at least at one end, and the screw 201 can be driven to rotate by holding the handle 202. For example, in the present embodiment, referring to fig. 1 and fig. 4, a handle 202 is disposed at one end of a screw 201, bearings 204 are disposed at two ends of the screw, the screw 201 is rotatably mounted in a groove of the longitudinal beam 120 through the two bearings 204, and the handle 202 is rotated to drive the screw 201 to rotate and further drive a slider 203 in threaded connection with the screw 201 to slide on the longitudinal beam 120. For another example, in other embodiments, handles 202 may be disposed at both ends of the screw 201, and when one of the handles 202 is damaged, the handle 202 at the other end of the screw 201 may be used to drive the screw 201 to rotate, so as to prolong the service life of the screw 201.

Of course, the driving manner of the screw 201 may also adopt the existing electric driving manner, for example, a linear motor is adopted as the sliding sleeve 200, two ends of the linear motor and two ends of the longitudinal beam 120 are fixed, a stator of the linear motor is adopted as the sliding block 203, a rotor of the linear motor is adopted as the screw 201, and under the energizing action of the linear motor, the rotor rotates to drive the stator to do linear motion, so that the sliding block 203 can slide on the longitudinal beam 120.

Specifically, the clamping mechanism 300 is connected with the sliding sleeve 200, the clamping mechanism 300 is used for clamping a pipeline, the sliding of the sliding block 203 on the longitudinal beam 120 drives the clamping mechanism 300 to move, the clamping mechanism 300 moves to drive the clamped pipeline to move, that is, the position of the pipeline is adjusted by moving the sliding block 203, so that the precision of pipeline butt joint is improved.

For example, in some embodiments, the clamping mechanism 300 may employ a mechanical arm commonly used in the prior art, one end of the mechanical arm is fixedly connected to the sliding block 203 of the sliding sleeve 200 sleeved on the longitudinal beam 120, and the other end (i.e., the free end) of the mechanical arm is used for clamping a pipeline, and the sliding block 203 moves on the longitudinal beam 120 to cooperate with the mechanical arm to achieve accurate positioning of the pipeline, so as to complete accurate docking of two sections of pipelines.

For another example, in the present embodiment, as shown in fig. 1, the slider 203 is fixed to the clamping mechanism 300 by a connecting rod 600, so that the clamping mechanism 300 and the slider 203 move synchronously. For another example, in other examples, the clamping mechanism 300 may be directly and fixedly connected to the slider 203 without providing the connecting rod 600, and here, the connection manner between the clamping mechanism 300 and the slider 203 is not specifically limited in this embodiment.

Further, referring to fig. 5 or fig. 7, the sliding block 203 may be fixedly connected to the clamping mechanism 300 through the retractable member 500, and the displacement change of the clamping mechanism 300 in the length direction of the cross beam 110 is adjusted through the retractable action of the retractable member 500, so that the pipeline moves along the direction of the cross beam 110, and the sliding block 203 moves along the length direction of the longitudinal beam 120 in a matching manner, so as to gradually approach two pipelines to be butted to realize the butting, thereby reducing the deflection of the butting surface of the pipelines, improving the butting precision of the pipelines to be welded, and further improving the welding quality of the pipelines.

For example, in some examples, a cylinder is employed as the extendable member 500; for another example, in other examples, an electric telescopic rod is adopted as the telescopic member 500, so that the use is convenient. For example, when the weight of the pipeline to be butted is large, a hydraulic cylinder can be used as the telescopic member 500, as shown in fig. 7, a cylinder barrel of the hydraulic cylinder is fixed to the sliding sleeve 200, a hydraulic rod of the hydraulic cylinder is fixed to the clamping mechanism 300, and the pipeline with large weight can be butted stably and accurately under the transmission action of the hydraulic cylinder, so that the butting precision of the pipeline is improved, and the welding quality of the pipeline is further improved.

Specifically, in this embodiment, as shown in fig. 5, the clamping mechanism 300 may include: retaining member 310 and two centre gripping arms 320 of relative setting, two the link 321 cover of centre gripping arm 320 is established together, retaining member 310 is used for two the link 321 of centre gripping arm 320 is locked, two the exposed core 322 of centre gripping arm 320 is used for the centre gripping pipeline. That is to say, the distance between the two clamping arms 320 can be adjusted to enable the clamping mechanism 300 to clamp pipes with different pipe diameters, and the application range of the clamping mechanism 300 is expanded.

For example, in this embodiment, please refer to fig. 5, the upper portion of the clamping arm 320 is used as the connecting end 321, the lower portion of the clamping arm 320 is used as the clamping end 322, the locking screw is used as the locking member 310, the connecting ends 321 of the two clamping arms 320 arranged oppositely adopt a sleeve structure, the position fixation of the connecting ends 321 of the two clamping arms 320 is realized under the action of the locking screw, the locking screw is firstly unscrewed before the clamping mechanism 300 clamps the pipeline, the pipeline to be clamped is placed between the two clamping arms 320, the distance between the two clamping arms 320 is adjusted to adapt to the pipe diameter of the pipeline to be clamped, the clamping effect of the two clamping arms 320 on the pipeline is realized by screwing the locking screw, and the position adjustment of the pipeline is realized under the moving effect of the clamping.

For another example, in some other embodiments, a pin may be used as the locking member 310, a plurality of pairs of positioning holes for inserting the pin are formed in the contact portion of the connecting ends 321 of the two clamping arms 320, when the distance between the two clamping arms 320 is changed, the positioning holes at different positions are aligned, and after the pin is inserted into the aligned positioning holes, the position fixation of the two clamping arms 320 can be achieved.

For example, in other embodiments, the connecting ends 321 of the two clamping arms 320 may adopt an existing snap-fit connection, that is, a snap is disposed on the connecting end 321 of one of the clamping arms 320, a corresponding snap is disposed on the connecting end 321 of the other clamping arm 320, the relative positions of the two clamping arms are locked by the cooperation of the snap and the snap, and the distance between the two clamping arms 320 is adjusted to adapt to pipes with different pipe diameters.

Further, a groove adapted to the shape of the pipeline is formed in a portion of the clamping end 322 of the clamping arm 320, which is in contact with the pipeline (i.e., an inner surface of the clamping end 322), so as to increase a contact area between the clamping arm 320 and the pipeline and ensure stability of clamping the pipeline, referring to fig. 5, when the pipeline is circular, an arc-shaped groove may be formed in the portion of the clamping end 322, which is in contact with the pipeline, and if the pipeline is square, a square groove as shown in fig. 6 is formed in the portion of the clamping end 322, which is in contact with the pipeline.

Specifically, the inner surface of the clamping end 322 of the clamping arm 320 may further be provided with a protrusion for increasing friction resistance, and the inner surface of the clamping end 322 is provided with an anti-slip protrusion, so that a clamped pipeline is prevented from slipping off from the clamping mechanism 300, the reliability of pipeline clamping is improved, and the butt joint precision of the pipeline is further ensured.

Further, with continued reference to fig. 7, the bottom of the support leg 130 may further be provided with a roller 400 for the operator to perform position shifting on the pipe welding positioning device. For example, in some examples, the roller may be made of rubber, and the rubber roller may reduce noise during use, and in other examples, the roller may be made of wear-resistant material, so as to prolong the service life of the roller.

Specifically, in some embodiments, the roller may further be provided with a brake pad, and when an operator moves the pipe welding positioning device to a different working position, the roller may be locked by controlling the brake pad, so as to avoid that the pipe welding positioning device moves in the pipe butt joint process, which increases the pipe butt joint dislocation.

The utility model provides a pipeline welding position device, include: a support frame 100, a sliding sleeve 200 and a clamping mechanism 300; the support frame 100 comprises a frame and support legs 130 for supporting the frame, the frame comprises cross beams 110 and longitudinal beams 120 which are oppositely arranged, and two ends of each longitudinal beam 120 are respectively fixed with the two cross beams 110 to form a rectangular frame structure; the two longitudinal beams 120 are respectively provided with a sliding sleeve 200, each sliding sleeve 200 is connected with a clamping mechanism 300, the two clamping mechanisms 300 are used for clamping two sections of pipelines to be butted, the pipelines move in the length direction of the longitudinal beams 120 by adjusting the relative positions of the two sliding sleeves 200, meanwhile, the clamping mechanisms 300 are fixedly connected with the sliding blocks 203 on the sliding sleeves 200 through the telescopic pieces 500, and the clamped pipelines move in the length direction of the cross beams 110 by adjusting the telescopic action of the telescopic pieces 500, so that the two sections of pipelines are gradually close to each other to realize accurate butt joint of the pipelines, the precision of butt joint of the pipelines is improved, and further the quality of pipeline welding is improved; by arranging the handle 202 at the end of the screw 201, an operator can conveniently hold and rotate the screw 201 to drive the sliding block 203 to slide on the longitudinal beam 120. In addition, the bottom of the supporting leg 130 can be provided with a roller 400, so that the position of the pipeline welding and positioning device can be conveniently transferred by an operator, and the position of the pipeline welding and positioning device can be locked by the roller with a brake pad, so that smooth butt joint of pipelines is ensured.

The above description has been made in detail with reference to the accompanying drawings, but the present invention is not limited to the details of the above embodiments, and the technical idea of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.

Claims

1. A pipe welding positioning device, comprising: the device comprises a support frame, a sliding sleeve and a clamping mechanism;

2. The pipe welding positioning device of claim 1, further comprising a telescoping member through which the clamping mechanism is coupled to the sliding sleeve.

3. The pipe welding positioning device according to claim 2, wherein the telescopic member is a hydraulic cylinder, a cylinder barrel of the hydraulic cylinder is fixed to the sliding sleeve, and a hydraulic rod of the hydraulic cylinder is fixed to the clamping mechanism.

4. The pipe welding positioning device of claim 1, wherein the sliding sleeve comprises: the screw rod is arranged on the longitudinal beam, and the sliding block is in threaded connection with the screw rod.

5. The pipe welding positioning device of claim 4, wherein the longitudinal beam is provided with a groove, and the screw is installed in the groove.

6. The pipe welding positioning device according to claim 5, wherein the sliding block is sleeved on the longitudinal beam, and a portion of the sliding block, which is in contact with the screw rod, is provided with a thread for connecting with the screw rod.

7. The pipe welding positioning device according to claim 4, wherein a bearing hole for the end of the screw to pass through is formed in the cross beam, and a bearing for bearing the screw is installed in the bearing hole;

the screw is provided with a handle at least at one end.

8. The pipe welding positioning device of any one of claims 1 to 7, wherein the clamping mechanism comprises: retaining member and two relative centre gripping arms that set up, two the link cover of centre gripping arm is established together, the retaining member is used for two the link locking of centre gripping arm.

9. The pipe welding positioning apparatus of claim 8, wherein an inner surface of the clamping end of the clamping arm is provided with a protrusion for increasing frictional resistance.

10. The pipe welding positioning device of any one of claims 1 to 7, wherein the bottom of the support leg is provided with a roller.