CN114589452B - Pipeline clamping equipment for welding - Google Patents

Abstract

The invention provides a pipeline clamping device for welding, relates to the technical field of pipeline welding tools, and aims to solve the problem that when a pipeline is fixed in the conventional mode, the pipeline and the clamping device slide relatively, so that subsequent welding operation cannot be smoothly carried out. The clamping device comprises two groups of clamping devices which are arranged at intervals along the axial direction of a pipeline, wherein each group of clamping device comprises a first clamping assembly and a second clamping assembly; the first clamping assemblies in the two groups of clamping devices are opposite along the axial direction, a first pull rod is connected between the two first clamping assemblies, the second clamping assemblies in the two groups of clamping devices are opposite along the axial direction, and a second pull rod is connected between the two second clamping assemblies; and the clamping spaces of the two groups of clamping devices are respectively provided with a limiting assembly, and the limiting assemblies are configured to prevent the pipeline from sliding along the set direction. The invention can avoid relative sliding between the pipeline and the clamping device, thereby ensuring the smooth operation of subsequent welding operation.

Description

Pipeline clamping equipment for welding

Technical Field

The invention relates to the technical field of pipeline welding tools, in particular to pipeline clamping equipment for welding.

Background

In the long-term operation and use of a power plant and the long-distance natural gas and oil transportation process, the performance deterioration of pipelines made of various materials and welding seams thereof in various pipeline systems can occur, so that safety accidents are caused, the safety of the natural gas and oil pipelines and the operation stability of the power plant are seriously affected, and therefore the pipelines with the deteriorated performance are required to be replaced frequently.

When the pipeline needs to be replaced, the pipeline with degraded performance needs to be cut off, a new pipeline is placed at the position, and the new pipeline is welded with the original pipeline, so that the purpose of replacing the pipeline can be achieved. However, when the existing pipeline is cut, the original pipeline is easy to slide along the axial direction due to the stress generated in the moment of cutting and separating the original pipeline, so that the relative sliding between the original pipeline and the clamping device occurs, and the subsequent welding operation cannot be smoothly performed.

Disclosure of Invention

The invention aims to provide a pipeline clamping device for welding, which aims to solve the technical problem that the pipeline and the clamping device slide relatively when the pipeline is fixed by adopting the conventional mode, so that the subsequent welding operation cannot be smoothly carried out.

The invention provides a pipeline clamping device for welding, which comprises two groups of clamping devices arranged at intervals along the axial direction of a pipeline, wherein each group of clamping devices comprises a first clamping assembly and a second clamping assembly, and a clamping space for clamping the pipeline is formed between the first clamping assembly and the corresponding second clamping assembly; the first clamping assemblies in the two groups of clamping devices are opposite along the axial direction, a first pull rod is connected between the two first clamping assemblies, the second clamping assemblies in the two groups of clamping devices are opposite along the axial direction, and a second pull rod is connected between the two second clamping assemblies; the clamping spaces of the two groups of clamping devices are respectively provided with a limiting assembly, the limiting assemblies are configured to prevent the pipeline from sliding along a set direction, and the set direction is a direction in which one of the two groups of clamping devices deviates from the other clamping device along the axial direction of the pipeline.

Further, the limiting assembly comprises a plurality of friction blocks arranged at intervals along the circumferential direction of the clamping space, and the plurality of friction blocks are configured to be in contact with the outer circumferential surface of the pipeline; the first clamping assembly comprises a first clamping seat, the second clamping assembly comprises a second clamping seat, the first clamping seat and the second clamping seat are respectively provided with the friction block, the friction block is movably arranged on the corresponding clamping seat and can be gradually close to the axis of the pipeline along the set direction after moving.

Furthermore, the friction block is mounted on the corresponding clamping seat through a mounting seat, the mounting seat is provided with a mounting cavity, a guide rod is fixedly arranged in the mounting cavity, and the guide rod extends and inclines towards the direction close to the axis of the pipeline along the set direction; the friction block is provided with a guide hole, the guide rod penetrates through the guide hole, and the guide rod is configured to guide the friction block to move.

Further, the spacing subassembly still includes reset element, reset element connects between rubbing block and mount pad, reset element is configured to when rubbing block and the outer peripheral face of pipeline separate, makes rubbing block reset.

Further, the mounting seats are rotatably mounted on the corresponding clamping seats, and the rotating axes of the mounting seats are parallel to the set direction.

Further, one surface of the friction block facing the clamping space is an arc-shaped concave surface, and the arc-shaped concave surface is configured to be in fit contact with the outer peripheral surface of the pipeline.

Furthermore, two ends of the first pull rod are respectively connected with the two first clamping assemblies in a sliding manner, two ends of the second pull rod are respectively connected with the two second clamping assemblies in a sliding manner, and the movement tracks of the first pull rod and the second pull rod both move along the circumferential direction of the pipeline and synchronously move; and the first pull rod and the second pull rod are spaced from the outer peripheral surface of the pipeline along the radial direction of the pipeline.

Further, the welding pipe clamping device further comprises a supporting device arranged between the two sets of clamping devices, the supporting device being configured to support the pipe; the support device connects the first and second tie rods, the support device further configured to synchronize movement of the first and second tie rods.

Further, the supporting device comprises a supporting seat, an arc-shaped sliding rod and a supporting plate, wherein the supporting seat is provided with an arc-shaped channel, the arc-shaped sliding rod is slidably arranged in the arc-shaped channel, the first end of the arc-shaped sliding rod is connected with the first pull rod in a hanging mode, and the second end of the arc-shaped sliding rod is connected with the second pull rod in a hanging mode; the pallet is liftably mounted to the support base, the pallet configured to support the pipeline.

Further, the welding pipe clamping device further comprises a self-positioning device configured to fix the first pull rod and the second pull rod when the first pull rod and the second pull rod move to a set position.

The pipeline clamping device for welding has the advantages that:

when needs are changed damaged pipeline for new pipeline, can utilize this for welding pipeline centre gripping equipment earlier to fix former pipeline, specifically do: the two groups of clamping devices are arranged at intervals along the axial direction of the pipeline, the original pipeline is clamped by utilizing a clamping space formed by the first clamping assembly and the second clamping assembly, and the pipeline which is damaged and needs to be replaced is positioned between the two groups of clamping devices, so that the original pipeline is fixed; the portion of the pipeline to be replaced may then be cut to cut the damaged pipeline for subsequent replacement of a new pipeline at that location.

When cutting the pipeline, on the one hand, can utilize first pull rod and second pull rod to be effectively resisted by cutting separation produced stress in the twinkling of an eye to the pipeline, prevent that the whole axial position that appears of pipeline from removing, the effective fixed to the pipeline has been realized, on the other hand, through set up spacing subassembly in centre gripping space, can further carry on spacingly to connecting originally at the pipeline that is downcut the pipeline both ends, prevent that the direction is carried on the back mutually away's slip to these two parts pipeline appearance, thereby avoid the pipeline phenomenon of sliding because of the stress that produces in the twinkling of an eye in the pipeline cutting separation, even make after the broken pipeline is downcut, the surplus pipeline still can be fixed in the original position by welding with pipeline centre gripping equipment, so that follow-up welding operation's going on smoothly afterwards.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a front view of a welding pipe clamping device according to an embodiment of the present invention;

FIG. 2 is a front sectional view of a welding pipe clamping device according to an embodiment of the present invention;

FIG. 3 isbase:Sub>A cross-sectional view A-A of FIG. 2;

FIG. 4 is an enlarged view of a portion of the structure shown at B in FIG. 3;

FIG. 5 is a cross-sectional view taken along line C-C of FIG. 4;

FIG. 6 is a cross-sectional view taken along line D-D of FIG. 3;

FIG. 7 is an enlarged view of a portion of the pipe gripping apparatus of FIG. 3 at a self-positioning device;

fig. 8 is a cross-sectional view taken along line E-E of fig. 7.

Description of reference numerals:

100-a clamping device; 200-a first pull rod; 210-a first stick; 220-a first flange configuration; 300-a second pull rod; 310-a second rod; 320-a second flange configuration; 400-a support device; 500-self-positioning means; 600-a spacing assembly;

110-a first clamping assembly; 111-a first gripper seat; 112-a first guide rail; 113-a rotation chamber; 120-a second clamping assembly; 121-a second clamping seat; 122-a second guide rail; 130-a sliding cavity; 140-a slide block; 150-a ball; 160-connecting bolts; 170-locking nut; 180-a clamping space;

410-a support base; 411-arc shaped channel; 420-an arc-shaped sliding rod; 421-strip shaped holes; 430-a pallet; 440-adjusting the screw rod; 450-a first hook; 451-a first hook; 452-a first stem portion; 453-a first coil spring; 460-a second hook; 461-second hook; 462-a second stem portion; 463-a second helical spring;

510-a gear; 520-arc rack; 530-a reset lever; 540-limit spring; 550-a one-way bearing; 560-a first return spring; 570-a second return spring; 580-a second rotating shaft;

610-a friction block; 611-a guide hole; 620-mount; 621-installation cavity; 630-a guide bar; 640-a reset element; 650-first axis of rotation.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 isbase:Sub>A front view ofbase:Sub>A welding pipe clamping device according to this embodiment, fig. 2 isbase:Sub>A front structural sectional view of the welding pipe clamping device according to this embodiment, and fig. 3 isbase:Sub>A sectional view taken alongbase:Sub>A linebase:Sub>A-base:Sub>A in fig. 2. As shown in fig. 1 to 3, the present embodiment provides a pipe clamping device for welding, including two sets of clamping devices 100 arranged at intervals in an axial direction of a pipe, where each set of clamping device 100 includes a first clamping assembly 110 and a second clamping assembly 120, and a clamping space 180 for clamping the pipe is formed between the first clamping assembly 110 and the corresponding second clamping assembly 120; the first clamping assemblies 110 in the two groups of clamping devices 100 are opposite along the axial direction, a first pull rod 200 is connected between the two first clamping assemblies 110, the second clamping assemblies 120 in the two groups of clamping devices 100 are opposite along the axial direction, and a second pull rod 300 is connected between the two second clamping assemblies 120; the limiting assemblies 600 are disposed in the clamping spaces 180 of the two sets of clamping devices 100, and the limiting assemblies 600 are configured to prevent the pipeline from sliding along a set direction, wherein the set direction is a direction in which one of the two sets of clamping devices 100 deviates from the other along the axial direction of the pipeline.

Referring to the perspective view of fig. 3, the setting direction of the upper clamp device 100 is indicated by an arrow a in the figure; for the lower clamping device 100, the set direction refers to the direction indicated by the arrow b in the figure.

When needs are changed damaged pipeline for new pipeline, can utilize this for welding pipeline centre gripping equipment earlier to fix former pipeline, specifically do: arranging two groups of clamping devices 100 at intervals along the axial direction of the pipeline, clamping the original pipeline by using a clamping space 180 formed by a first clamping assembly 110 and a second clamping assembly 120, and enabling the damaged pipeline to be replaced to be positioned between the two groups of clamping devices 100 to finish fixing the original pipeline; the portion of the pipeline to be replaced may then be cut to cut the damaged pipeline for subsequent replacement of a new pipeline at that location.

When cutting the pipeline, on the one hand, can utilize first pull rod 200 and second pull rod 300 to be effectively resisted by cutting separation produced stress in the twinkling of an eye to the pipeline, prevent that the whole axial position that appears of pipeline from removing, the effective fixed to the pipeline has been realized, on the other hand, through set up spacing subassembly 600 in centre gripping space 180, can further carry on spacingly to connecting originally at the pipeline that is downcut the pipeline both ends, prevent that the direction is carried on the back mutually back to slip appears in these two parts pipeline, thereby avoid the pipeline phenomenon of sliding because of the stress that produces in the twinkling of an eye in the pipeline cutting separation, even make after the broken old pipeline is downcut, the surplus pipeline still can be fixed in situ by welding with pipeline centre gripping equipment, so that follow-up welding operation's going on smoothly afterwards.

With continued reference to fig. 1 and 2, in the present embodiment, the limiting assembly 600 includes a plurality of friction blocks 610 arranged at intervals along the circumferential direction of the clamping space 180, and the plurality of friction blocks 610 are configured to contact the outer circumferential surface of the pipe. Referring to fig. 3, the first clamping assembly 110 includes a first clamping seat 111, the second clamping assembly 120 includes a second clamping seat 121, and the first clamping seat 111 and the second clamping seat 121 are both provided with friction blocks 610, specifically, the friction blocks 610 are movably disposed on the corresponding clamping seats, and along a set direction, the friction blocks 610 can gradually approach to an axis of the pipe after moving. Where the dotted line z indicates the axis of the pipe.

This is illustrated in the perspective of fig. 3. This pipeline centre gripping equipment for welding is in the use, after utilizing the cutting machine to cut the pipeline, upwards drunkenness trend can appear in the pipeline of top to the stress that produces in the twinkling of an eye in the cutting separation to, make the pipeline of below appear downwards drunkenness trend. For the pipeline of top, when ascending drunkenness trend appears in the pipeline, this kind of trend will drive also to produce ascending movement trend with the clutch blocks 610 that the pipeline surface contacted, through setting up clutch blocks 610 to the form that can be close to the axis of pipeline after removing gradually, make when the clutch blocks 610 of top produce ascending movement trend after, will produce the removal weight that is close to the pipeline axis for the centre gripping space 180 of clamping device 100 of top reduces, in order to press from both sides the pipeline of top tightly, thereby effectively avoided the pipeline of top to upwards slide, played the fixed effect of the pipeline of top. Similarly, for the lower pipe, when the pipe has a downward movement tendency, the friction block 610 contacting with the surface of the pipe will be driven by the downward movement tendency by the tendency, and by setting the friction block 610 to be in a form of being gradually close to the axis of the pipe after moving, so that after the downward movement tendency is generated by the friction block 610, a moving component close to the axis of the pipe will also be generated, so that the clamping space 180 of the clamping device 100 below is reduced to clamp the pipe below, thereby effectively avoiding the downward sliding of the pipe below and playing a role of fixing the pipe below.

The arrangement form of the limiting assembly 600 can increase the friction force between the limiting assembly and the outer peripheral surface of the pipeline instantly when the pipeline is cut and separated, so that the purpose of preventing the pipeline from sliding is achieved, the fixing quality of the pipeline is guaranteed, in addition, the pipeline cannot be damaged by rigid collision, and a certain protection effect is achieved on the pipeline.

Referring to fig. 2, in the present embodiment, in each group of the clamping devices 100, the limiting assembly 600 includes ten friction blocks 610, specifically, five friction blocks 610 are installed on the first clamping seat 111, and the five friction blocks 610 are arranged at equal intervals along the arc-shaped direction of the clamping space 180; five friction blocks 610 are also installed on the second clamping seat 121, and the five friction blocks 610 are arranged at equal intervals along the arc-shaped trend of the clamping space 180. So set up for the clamping-force that the pipeline received is comparatively balanced, avoids pipeline local stress to concentrate.

Fig. 4 is an enlarged view of a portion B of fig. 3. With reference to fig. 3 and fig. 4, in the present embodiment, the friction block 610 is mounted on the corresponding clamping seat through the mounting seat 620, specifically, the mounting seat 620 is provided with a mounting cavity 621, a guide rod 630 is fixedly disposed in the mounting cavity 621, and the guide rod 630 extends and inclines towards a direction close to an axis of the pipeline along a set direction; the friction block 610 is provided with a guide hole 611, the guide rod 630 is arranged through the guide hole 611, and the guide rod 630 is configured to guide the friction block 610 to move.

The friction block 610 shown in fig. 4 is taken as an example for explanation. When the friction block 610 shown in fig. 4 follows the downward movement tendency of the pipe, the friction block 610 will slide downward on the guide bar 630 through the guide hole 611, so that the friction block 610 gradually approaches the axis of the pipe, thereby achieving the purpose of increasing the friction force between the friction block 610 and the pipe to further clamp the pipe.

This kind of installation form of clutch block 610, simple structure moreover, through setting up guide bar 630 in installation cavity 621 for clutch block 610 also has partly embedding in installation cavity 621 after the assembly, has played certain limiting displacement to clutch block 610, has effectively prevented clutch block 610 from breaking away from corresponding grip slipper along the axial of pipeline.

It should be noted that "the corresponding holder" refers to the first holder 111 or the second holder 121, and since the friction block 610 has the same mounting structure on the first holder 111 and the second holder 121, this embodiment will be described in combination.

With continued reference to fig. 4, in the present embodiment, the limiting assembly 600 further includes a resetting element 640, the resetting element 640 is connected between the friction block 610 and the mounting seat 620, and the resetting element 640 is configured to reset the friction block 610 when the friction block 610 is separated from the outer circumferential surface of the pipe. Wherein, the reset of the friction block 610 means that the friction block 610 is moved in a direction opposite to the set direction.

Through setting up resetting element 640 for behind clutch blocks 610 and pipeline surface separation, clutch blocks 610 can automatic re-setting, and on the one hand, guaranteed that spacing subassembly 600 is reliable spacing to the pipeline in next operation, on the other hand need not the operation personnel manual reset, has reduced intensity of labour, moreover, has also avoided the situation of the unable normal work of welding with pipeline centre gripping equipment because of the operation personnel forget and lead to.

Referring to fig. 4, in the present embodiment, the reset element 640 includes a coil spring, the reset element 640 is disposed in the mounting cavity 621, the reset element 640 is sleeved on the guide rod 630, one end of the reset element 640 abuts against the mounting seat 620, and the other end abuts against the friction block 610. For the friction block 610 shown in fig. 4, when it generates a downward movement tendency, the restoring element 640 is compressed, so that the restoring element 640 generates an elastic restoring force, and the elastic restoring force can drive the friction block 610 to move upward after the friction block 610 is separated from the outer circumferential surface of the pipe.

Fig. 5 is a cross-sectional view taken along line C-C of fig. 4. Referring to fig. 4 in combination with fig. 5, in the present embodiment, the mounting seat 620 is rotatably mounted on the corresponding clamping seat, and the rotation axis of the mounting seat 620 is parallel to the setting direction. Specifically, the mounting seats 620 are rotatably mounted to the corresponding clamping seats by a first rotating shaft 650.

The arrangement of the mounting seat 620 enables the friction block 610 to be tightly attached to the surface of the pipe to the maximum extent when pipes with different pipe diameters are clamped, so as to increase the friction force between the friction block 610 and the outer peripheral surface of the pipe, thereby ensuring the reliability of clamping the pipe.

Referring to fig. 4 and fig. 5, specifically, the holder defines a rotation cavity 113, and the mounting seat 620 is rotatably disposed in the rotation cavity 113 through a first rotation shaft 650. It should be noted that, in fig. 4 and fig. 5, only the installation of the limiting assembly 600 on the first clamping seat 111 is taken as an example for description, and the installation structure of the limiting assembly 600 on the second clamping seat 121 is the same as the installation structure of the limiting assembly on the first clamping seat 111, and is only in a mirror symmetry relationship, so that the detailed description of the embodiment is omitted.

Referring to fig. 5, in the present embodiment, a surface of the friction block 610 facing the clamping space 180 is an arc-shaped concave surface, and the arc-shaped concave surface is configured to be in contact with an outer circumferential surface of the pipe. The one surface of the friction block 610 facing the clamping space 180 is set to be an arc-shaped concave surface, so that the contact area between the friction block 610 and the outer peripheral surface of the pipeline can be further increased, and the reliability of the pipeline clamping device for welding in the embodiment in clamping the pipeline is further improved.

Referring to fig. 2, in the embodiment, two ends of the first pull rod 200 are slidably connected to the two first clamping assemblies 110, two ends of the second pull rod 300 are slidably connected to the two second clamping assemblies 120, and the movement tracks of the first pull rod 200 and the second pull rod 300 both move along the circumferential direction of the pipeline and synchronously move; the first and second tie rods 200 and 300 are spaced apart from the outer circumferential surface of the pipe in the radial direction of the pipe.

When carrying out welding operation to the pipeline, through setting up first pull rod 200 and second pull rod 300 into the circumferential motion that can follow the pipeline for the operation personnel can alternate first pull rod 200 and second pull rod 300 along the position of pipeline circumference at will according to welding operation needs, so that welding operation's smooth exhibition of executing, improvement pipeline welding quality. In addition, the first pull rod 200 and the second pull rod 300 can be used as the installation basis of the cutting machine and the welding machine together in the synchronous movement mode of the first pull rod 200 and the second pull rod 300, so that the installation stability of the cutting machine and the welding machine is ensured, the stable operation of the cutting machine and the welding machine is ensured, and the purpose of improving the cutting quality and the welding quality is achieved.

Referring to fig. 3, in the present embodiment, the pipe clamping device for welding further includes a supporting device 400, specifically, the supporting device 400 is disposed between the two sets of clamping devices 100, and the supporting device 400 is configured to support the pipe; the supporting device 400 connects the first and second tie rods 200 and 300, and the supporting device 400 is further configured to move the first and second tie rods 200 and 300 in synchronization.

When the clamping devices 100 are used for clamping and fixing the pipeline, the supporting device 400 can be used for supporting the damaged pipeline between the two groups of clamping devices 100, so that the original pipeline can be fixed; then, the pipe to be replaced is cut, the damaged pipe is cut, a new pipe to be replaced is placed between the two sets of clamping devices 100, the new pipe is supported by the supporting devices 400, and after the butt joint of the pipe and the edge of the rest pipe is completed, the joint is welded. In the process of welding operation, an operator can push the first pull rod 200 or the second pull rod 300 at any time according to operation requirements, and under the action of the supporting device 400, the first pull rod 200 and the second pull rod 300 move synchronously to be positioned at a position without influencing welding, so that the welding operation is facilitated to be performed.

The supporting device 400 can support the pipeline, prevent the cut pipeline from falling accidentally, and realize power transmission between the first pull rod 200 and the second pull rod 300, so that the first pull rod 200 and the second pull rod 300 can move synchronously.

Referring to fig. 3, in the present embodiment, the pipe clamping device for welding includes two sets of supporting devices 400, and the two sets of supporting devices 400 are disposed at intervals along the axial direction of the pipe. So set up, can increase the strong point quantity to the pipeline, realize the reliable support to the pipeline.

Fig. 6 is a cross-sectional view taken along line D-D in fig. 3. Referring to fig. 3 and fig. 6, in the present embodiment, the supporting device 400 includes a supporting seat 410, an arc-shaped sliding rod 420 and a supporting plate 430, specifically, the supporting seat 410 is provided with an arc-shaped channel 411, the arc-shaped sliding rod 420 is slidably disposed in the arc-shaped channel 411, a first end of the arc-shaped sliding rod 420 is connected to the first pull rod 200 in a hanging manner, and a second end of the arc-shaped sliding rod 420 is connected to the second pull rod 300 in a hanging manner; a blade 430 is elevationally mounted to the support base 410, the blade 430 configured to support a pipeline.

When the pipeline clamping device for welding is used for fixing the pipeline, the pipeline can be placed on the supporting plate 430, and the pipeline is supported by the supporting plate 430; in the welding process, when a worker pushes the first pull rod 200 or the second pull rod 300, the arc slide rod 420 slides in the arc channel 411 of the support base 410, so as to guide the movement of the first pull rod 200 and the second pull rod 300, and thus, the welding operation can be effectively avoided. Moreover, in the above process, the arc slide rod 420 plays a role of connecting the first pull rod 200 and the second pull rod 300, so that the first pull rod 200 and the second pull rod 300 can move synchronously, and the support seat 410 will always maintain a fixed state, only the arc channel 411 is used to guide the sliding process of the arc slide rod 420, and the sliding process will not move along with the arc slide rod 420, that is: the pallet 430 will always remain in a support position (below the pipeline) effectively supporting the pipeline.

The arrangement form of the supporting device 400 not only can realize the synchronous movement of the first pull rod 200 and the second pull rod 300, but also enables the sliding process of the first pull rod 200 and the second pull rod 300 and the supporting process of the supporting plate 430 to the pipeline to be mutually independent, so that when an operator pushes the first pull rod 200 or the second pull rod 300, the pipeline cannot be displaced, and the welding quality is further improved. Also, the abutting between the pipes is facilitated by providing the support plate 430 in a liftable form. In addition, the connection of the supporting device 400 to the first and second tie rods 200 and 300 is also facilitated by providing the arc-shaped sliding bar 420 in a form of being hooked with the first and second tie rods 200 and 300.

It should be noted that, in the embodiment, the supporting seat 410 may be fixedly disposed in a manner that the supporting seat 410 is directly placed on the ground and is fixed.

Referring to fig. 6, in the present embodiment, the supporting plate 430 is an arc-shaped plate, the concave portion of the arc-shaped plate faces the pipeline, and the generatrix direction of the arc-shaped plate is along the radial direction of the pipeline. The arrangement form of the supporting plate 430 can play a role in centering and positioning the pipeline after the pipeline is placed on the supporting plate 430, and ensures the cutting quality and the welding quality.

Referring to fig. 1, fig. 2 and fig. 6, in the present embodiment, the supporting device 400 further includes an adjusting screw 440, specifically, the adjusting screw 440 is screwed to the supporting base 410 and can move away from or close to the pipeline along the radial direction of the pipeline, and the supporting plate 430 is rotatably engaged with one end of the adjusting screw 440 facing the pipeline.

After placing new pipeline in layer board 430, the operation personnel can utilize accommodate the lead screw 440 to the action of being close to or keeping away from of pipeline through rotating accommodate the lead screw 440, realize the regulation to pipeline support height for new pipeline can reliably dock with the edge of surplus pipeline, in order to guarantee the smooth welding of pipeline.

Referring to fig. 3 and fig. 6, in the present embodiment, the arc-shaped sliding rod 420 is provided with a strip-shaped hole 421 extending along the direction of the arc-shaped sliding rod, and the adjusting screw 440 is inserted into the strip-shaped hole 421.

Through seting up the bar hole 421 that makes accommodate the lead screw 440 pass at arc slide bar 420, on the one hand, make both along the radial distribution of pipeline of layer board 430 and supporting seat 410, shortened strutting arrangement 400 along the axial size of pipeline, make strutting arrangement 400's structure comparatively compact, save space, on the other hand, still make arc slide bar 420 at the gliding in-process of arc passageway 411 of supporting seat 410, can effectively dodge accommodate the lead screw 440, make the slip process of first pull rod 200 and second pull rod 300 both mutually independent with accommodate the accommodation process of lead screw 440, can not take place to interfere.

Referring to fig. 6, in the present embodiment, a first end of the arc sliding rod 420 is connected to a first hook 450, and a second end of the arc sliding rod 420 is connected to a second hook 460, wherein the first hook 450 is used for being connected to the first pull rod 200, and the second hook 460 is used for being connected to the second pull rod 300.

The first hook 450 and the second hook 460 are respectively arranged at the two ends of the arc-shaped sliding rod 420, so that the first pull rod 200 and the second pull rod 300 can be hooked, the connection mode is simple, and the support device 400 can be conveniently mounted and dismounted. Moreover, in the actual use process, the operator can also change the axial position of the supporting device 400 along the pipeline by sliding the first hook 450 on the first pull rod 200 and sliding the second hook 460 on the second pull rod 300 according to the length of the pipeline to be supported by the operator as required, so as to realize the adjustment of the supporting length, and the supporting device 400 does not need to be detached and then installed again in the adjusting process, which is convenient and fast.

Referring to fig. 6, in the present embodiment, the first hook 450 includes a first hook portion 451, a first rod portion 452, and a first coil spring 453, a first insertion hole is formed at a first end of the arc-shaped slide bar 420, the first rod portion 452 is inserted into the first insertion hole, the first hook portion 451 is fixedly connected to the first rod portion 452, the first hook portion 451 is used for being connected to the first pull rod 200, the first coil spring 453 is sleeved on the first rod portion 452, one end of the first coil spring 453 abuts against the first hook portion 451, and the other end of the first coil spring 453 abuts against the first end of the arc-shaped slide bar 420.

The first hook 451 is not only connected to the first end of the arc-shaped sliding rod 420 and the first pull rod 200, but also connected to the first pull rod 200 by the first coil spring 453, so that the first hook 451 is firmly connected to the first pull rod 200 and does not separate from the first pull rod 200 during the sliding of the first pull rod 200.

Referring to fig. 6, similarly, the second hook 460 includes a second hook portion 461, a second rod portion 462 and a second spiral spring 463, a second insertion hole is formed at the second end of the arc-shaped sliding rod 420, the second rod portion 462 is inserted into the second insertion hole, the second hook portion 461 is fixedly connected with the second rod portion 462, the second hook portion 461 is used for being hooked with the second pull rod 300, the second spiral spring 463 is sleeved on the second rod portion 462, one end of the second spiral spring 463 is connected with the second hook portion 461, and the other end of the second spiral spring 463 is connected with the second end of the arc-shaped sliding rod 420.

The second hook 461 is not only able to couple the second end of the arc-shaped sliding rod 420 to the second pull rod 300, but also able to firmly hang the second hook 461 on the second pull rod 300 under the action of the second coil spring 463, so as not to be separated from the second pull rod 300 during the sliding process of the second pull rod 300.

Referring to fig. 3, in the present embodiment, the first pull rod 200 includes a plurality of first rods 210, the plurality of first rods 210 are distributed along the axial direction of the pipeline, and any two adjacent first rods 210 are detachably and fixedly connected. Similarly, the second rod 300 includes a plurality of second rods 310, the plurality of second rods 310 are also distributed along the axial direction of the pipe, and any two adjacent second rods 310 are detachably and fixedly connected.

Through setting up first pull rod 200 into the structure that mainly comprises many first body of rods 210, set up second pull rod 300 into the structure that mainly comprises many second body of rods 310, make this pipeline clamping equipment for welding when using, the operating personnel can select the quantity of first body of rod 210 and the second body of rod 310 by oneself according to the length of pipeline, in order to reach the purpose that increases or reduce pipeline clamping equipment axial length for the welding, make pipeline clamping equipment for the welding can be applicable to the fixed of multiple length specification pipeline, the commonality of pipeline clamping equipment for the welding of this embodiment has been improved.

Specifically, in this embodiment, any two adjacent first rods 210 are detachably and fixedly connected through the first flange structure 220, and any two adjacent second rods 310 are detachably and fixedly connected through the second flange structure 320. The form of connecting the plurality of first rods 210 and the plurality of second rods 310 is not only reliable in connection, but also simple in structure and easy to implement.

With continued reference to fig. 3, in the present embodiment, the welding pipe clamping device further includes a self-positioning device 500, wherein the self-positioning device 500 is configured to fix the first pull rod 200 and the second pull rod 300 when the first pull rod 200 and the second pull rod 300 move to the set position. The self-positioning device 500 is arranged so that after the operator pushes the first pull rod 200 and the second pull rod 300 to move to a position where the welding operation is not affected, the first pull rod 200 and the second pull rod 300 can be fixed at the position and remain still without being additionally fixed by the operator, thereby further reducing the interference with the welding operation.

Fig. 7 is an enlarged view of a portion of the pipe clamping device for welding of fig. 3 at a self-positioning device 500, and fig. 8 is a cross-sectional view E-E of fig. 7. Referring to fig. 2 and fig. 3, and with reference to fig. 7 and fig. 8, in the present embodiment, each of the first clamping assemblies 110 and each of the second clamping assemblies 120 are provided with a sliding cavity 130, a direction of the sliding cavity 130 is along a circumferential direction of the pipeline, two ends of the first pull rod 200 and two ends of the second pull rod 300 respectively extend into the corresponding sliding cavities 130, and each sliding cavity 130 is provided with the self-positioning device 500. Specifically, the self-positioning device 500 comprises a gear 510, an arc-shaped rack 520, a reset rod 530 and a limit spring 540, wherein the gear 510 is only arranged at the end part of the corresponding pull rod in a unidirectional rotation manner, the arc-shaped rack 520 is movably arranged in the sliding cavity 130, the moving direction of the arc-shaped rack 520 is along the radial direction of the pipeline, the concave part of the arc-shaped rack 520 faces the pipeline, the tooth shape of the arc-shaped rack 520 is arranged in the concave part, and the gear 510 is in meshing transmission with the arc-shaped rack 520; the reset rod 530 is fixedly connected to the protruding portion of the arc-shaped rack 520, the reset rod 530 extends from the corresponding sliding cavity 130, the limiting spring 540 is sleeved on the reset rod 530, and the limiting spring 540 is configured to make the arc-shaped rack 520 always have a movement tendency of abutting and meshing with the gear 510.

The sliding process and the self-positioning principle of the first pull rod 200 will be described as an example. When the operator applies a pushing force to the first pull rod 200, the first pull rod 200 will slide in the sliding cavity 130 along the direction of the sliding cavity 130, that is: the sliding track is along the circumferential direction of the pipeline; during the sliding process of the first pull rod 200, the gear 510 mounted at the end thereof will engage with the corresponding arc-shaped rack 520, and during the engagement transmission of the gear 510 and the arc-shaped rack 520, the change of the position of the first pull rod 200 is realized; since the gear 510 is mounted to the end of the first link 200 to be rotated only in one direction, when the operator does not apply any pushing force to the first link 200 any more, the gear 510 is stopped by the engagement of the arc-shaped rack 520, so that the first link 200 is maintained at the current position. When the first pull rod 200 needs to be reset after the welding operation is completed, the reset rod 530 is pulled to move the arc-shaped rack 520 in the radial direction of the pipeline and away from the pipeline, so that the engagement limit of the arc-shaped rack 520 on the gear 510 is released, and the first pull rod 200 is reset, wherein the second pull rod 300 synchronously moves in the process of the movement of the first pull rod 200.

This kind of from the setting form of positioner 500 for the operation personnel in the welding operation process, promote first pull rod 200 and can make first pull rod 200 automatic fixation position after setting for the position, do not exert other effort to first pull rod 200 and make the still that keeps first pull rod 200, moreover, spacing spring 540's setting still makes arc rack 520 have the motion trend with gear 510 butt meshing all the time, thereby realized reliable spacing to first pull rod 200, avoid influencing the welding process because of first pull rod 200 falls suddenly.

It should be noted that, in the present embodiment, when the worker pushes the second pull rod 300, the sliding process and the self-positioning principle of the second pull rod 300 are similar to those of the first pull rod 200, and therefore, the details of the sliding process and the self-positioning principle will not be described in detail. Wherein, during the movement of the second pull rod 300, the first pull rod 200 also moves synchronously.

Referring to fig. 2 and fig. 3, in the present embodiment, the first clamping assembly 110 further includes a first guide rail 112 fixedly connected to the first clamping base 111, wherein the sliding cavity 130 disposed in the first clamping assembly 110 is opened in the first guide rail 112; similarly, the second clamping assembly 120 further includes a second guide rail 122 fixedly connected to the second clamping seat 121, wherein the sliding cavity 130 provided in the second clamping assembly 120 is opened in the second guide rail 122.

Referring to fig. 3 and fig. 7, in the present embodiment, the sliding blocks 140 are fixedly connected to two ends of the first pull rod 200 and two ends of the second pull rod 300, the first pull rod 200 and the second pull rod 300 are respectively matched with the corresponding sliding cavities 130 through the sliding blocks 140, and the sliding surfaces of the sliding blocks 140 are provided with the balls 150; the gear 510 is mounted to the slider 140 by a one-way bearing 550.

The sliding blocks 140 are arranged at the end parts of the first pull rod 200 and the second pull rod 300, so that the first pull rod 200 and the second pull rod 300 are connected with the corresponding sliding cavities 130 in a sliding mode, and the sliding balls 150 are arranged on the sliding surfaces of the sliding blocks 140, so that the sliding friction between the sliding blocks 140 and the sliding cavities 130 can be converted into rolling friction, the friction force of the sliding blocks 140 in the sliding process is reduced, and the smoothness of the movement of the first pull rod 200 and the second pull rod 300 is guaranteed.

Referring to fig. 7, in the present embodiment, the gear 510 is connected to the one-way bearing 550 through the second rotating shaft 580.

It should be noted that, in the present embodiment, the end of the sliding cavity 130 may be an opening design to implement the installation of the self-positioning device 500 in the sliding cavity 130.

With reference to fig. 2, in this embodiment, the self-positioning device 500 further includes a first return spring 560 and a second return spring 570, the first return spring 560 is disposed at both ends of the first pull rod 200, one end of the first return spring 560 is used for connecting with the first clamping assembly 110, the other end of the first return spring 560 is used for connecting with the first pull rod 200, and when the gear 510 of the self-positioning device 500 disposed corresponding to the first pull rod 200 is separated from the arc-shaped rack 520, the first return spring 560 is configured to return the first pull rod 200; the second pull rod 300 is provided at both ends thereof with second return springs 570, one ends of the second return springs 570 are used to connect with the second clamping assembly 120, the other ends of the second return springs 570 are used to connect with the second pull rod 300, and when the gear 510 of the self-positioning device 500, which is disposed corresponding to the second pull rod 300, is separated from the arc-shaped rack 520, the second return springs 570 are configured to return the second pull rod 300.

In the welding operation, the first pull rod 200 and the second pull rod 300 are moved counterclockwise in fig. 2, wherein the first pull rod 200 is located at the left side of the clamping space 180, and the second pull rod 300 is located at the right side of the clamping space 180. When the first pull rod 200 and the second pull rod 300 move counterclockwise to the set position and remain stationary, such as: the first pull rod 200 and the second pull rod 300 are kept at the position shown in fig. 2, at this time, under the action of the first return spring 560, the slider (the left slider 140) connected with the first pull rod 200 tends to move upwards, the slider (the right slider 140) connected with the second pull rod 300 tends to move downwards, and the sliders 140 at both sides cannot rotate in the sliding cavity 130, so that the gears 510 at both sides cannot rotate reversely, and the first pull rod 200 at the left side and the second pull rod 300 at the right side can be kept at a static state; when the meshing limit function of the arc-shaped rack 520 on the gear 510 is released, the slider 140 connected with the first pull rod 200 is moved upwards and reset under the action of the first return spring 560, and the slider 140 connected with the second pull rod 300 is moved downwards and reset under the action of the second return spring 570.

Through setting up first reset spring 560 and second reset spring 570, can realize the automatic re-setting of first pull rod 200 and second pull rod 300 after arc rack 520 separates with gear 510, convenient and fast. Also, by disposing the first and second return springs 560 and 570 to be centrosymmetric along the center line of the clamping space 180 (i.e., the axis of the pipe), it is possible to secure the balance of the forces applied to the first and second tie rods 200 and 300.

It should be noted that the position of the slider 140 shown in fig. 2 is an intermediate position during the movement of the slider 140, that is, an intermediate position between the first pull rod 200 and the second pull rod 300. After the limit of the arc-shaped rack 520 to the gear 510 is released, the slider 140 on the left side moves upwards to the position attached to the top wall of the sliding cavity 130, so that the reset is realized, and the slider 140 on the right side moves downwards to the position attached to the bottom wall of the sliding cavity 130, so that the reset is realized.

Referring to fig. 1 and fig. 2, in each set of the clamping devices 100, the first clamping assembly 110 is fixedly provided with a connecting bolt 160, and the second clamping assembly 120 is provided with a connecting through hole at a position corresponding to the connecting bolt 160. When a pipeline needs to be clamped, the first clamping assembly 110 and the second clamping assembly 120 are respectively arranged on two sides of the pipeline, and the connecting bolt 160 of the first clamping assembly 110 is penetrated through the connecting through hole of the second clamping assembly 120 and is fastened by the locking nut 170, so that the butt joint of the first clamping assembly 110 and the second clamping assembly 120 is realized.

Specifically, in this embodiment, the first clamping assembly 110 is fixedly provided with two connecting bolts 160, the two connecting bolts 160 are arranged along the radial direction of the first clamping assembly 110 at intervals, and are respectively located above and below the pipeline, and correspondingly, the second clamping assembly 120 is provided with two connecting through holes corresponding to the two connecting bolts one to one. When the pipe is required to be clamped, the two connecting bolts 160 of the first clamping assembly 110 respectively pass through the two connecting through holes of the second clamping assembly 120 in a one-to-one correspondence manner, and are fastened by the locking nuts 170. So set up, guaranteed the reliability to the pipeline centre gripping.

The use method of the welding pipe clamping device comprises the following steps:

in the initial state of the welding pipe clamping device, the first return spring 560 and the second return spring 570 are in a relaxed state, and the left slider 140 will abut against the top wall of the sliding cavity 130 and the right slider 140 will abut against the bottom wall of the sliding cavity 130, as viewed in fig. 2; the reduction element 640 is in a relaxed state, and the friction block 610 abuts against the wall of the installation cavity 621 facing away from the reduction element 640; the limiting spring 540 is in a compressed state, and the arc-shaped rack 520 is meshed with the gear 510; the first coil spring 453 and the second coil spring 463 are in a relaxed state.

Clamping the first clamping assembly 110 and the second clamping assembly 120 of one group of clamping devices 100 at one end of the pipe to be replaced, and clamping the first clamping assembly 110 and the second clamping assembly 120 of the other group of clamping devices 100 at the other end of the pipe to be replaced; in the process, the first rod body 210 and the second rod body 310 can be changed in number to extend or shorten the first pull rod 200 and the second pull rod 300, so that the fixing requirements of the current length of the pipeline can be met.

The two groups of supporting devices 400 are placed below the pipeline, the first hook 450 and the second hook 460 of each group of supporting devices 400 are connected with the first pull rod 200 and the second pull rod 300, the adjusting screw rod 440 is rotated, the adjusting screw rod 440 moves towards the direction close to the pipeline, and therefore the supporting plate 430 is driven to move upwards until the bearing surface of the supporting plate 430 is abutted to the pipeline.

The lock nut 170 in the clamping device 100 is rotated, and the first clamping assembly 110 and the second clamping assembly 120 are close to each other by the screw transmission of the lock nut 170 and the connecting bolt 160 until the lock nut 170 cannot rotate continuously, so that the reliable clamping and fixing of the clamping device 100 to the pipeline are realized. In this process, the first and second tie rods 200 and 300 approach each other in the radial direction of the pipe, and both the first and second coil springs 453 and 463 are compressed. Meanwhile, since the mounting seat 620 can rotate around the first rotating shaft 650 in a small range, the friction block 610 can be attached to the outer circumferential surface of the pipe to the maximum extent, so that the pipe can be fixed by the friction force between the friction block 610 and the outer circumferential surface of the pipe.

The pipeline is cut by the cutting machine, the pipeline needing to be replaced is cut off, specifically, the cutting position of the pipeline is two positions, the first position is the position between the upper clamping device 100 and the upper supporting device 400 in the graph 3, the second position is the position between the lower clamping device 100 and the lower supporting device 400 in the graph 3, after the pipeline is cut, the cut pipeline is supported by the supporting plates 430 of the two groups of supporting devices 400, and the pipeline is prevented from falling and injuring ground operators.

At the moment when the old pipe is cut off, the original pipes on both sides of the old pipe will generate stress along a set direction, so that the pipe above generates an upward movement trend in the view of fig. 3, and the pipe below generates a downward movement trend, so that the friction block 610 above generates an upward movement trend and the friction block 610 below generates a downward movement trend. Because the moving direction of the friction block 610 gradually approaches to the axis of the pipe, the friction block 610 will continuously clamp the pipe under the above-mentioned moving tendency, so as to continuously increase the friction force between the friction block 610 and the pipe, thereby achieving the purpose of preventing the friction block 610 and the outer circumferential surface of the pipe from sliding relatively, and ensuring the pipe clamping quality.

The cut pipeline is taken down, the original pipeline is subjected to groove processing through the groove machine, and the distance between the first pull rod 200 and the second pull rod 300 and the pipeline is large enough, so that the normal operation of the groove machine cannot be influenced.

A new pipeline is placed on the supporting plates 430 of the two groups of supporting devices 400, the adjusting screw rods 440 corresponding to the supporting plates 430 are rotated, and the position of the new pipeline is adjusted by the movement of the supporting plates 430 along the up-down direction (the direction close to or away from the pipeline) so as to align with the original pipeline, thereby ensuring the smooth butt joint of the new pipeline and the original pipeline.

The operation personnel weld the new pipeline to former pipeline through welding operation, and in welding process, because the first pull rod 200 of pipeline both sides and second pull rod 300 all can slide along the circumference of pipeline, so the operation personnel can promote first pull rod 200 or second pull rod 300 according to the demand, make its motion to the position that does not influence welding operation to welding operation's smooth exhibition of executing. During the movement of the first pull rod 200 and the second pull rod 300, the slider 140 on the corresponding side is driven to slide along the sliding cavity 130, so that the first return spring 560 and the second return spring 570 are compressed, and at the same time, the first return spring 560 and the second return spring 570 in fig. 2 are driven to roll along the corresponding arc-shaped rack 520, so that the gear 510 on the corresponding side is driven to rotate. Specifically, when the left gear 510 rolls downward along the left arc-shaped rack 520 in the view of fig. 2, the left gear 510 drives the left rotating shaft to rotate, and the left rotating shaft and the left slider 140 rotate relatively, at this time, the right gear 510 rolls upward along the right arc-shaped rack 520, the right gear 510 drives the right rotating shaft to rotate, and the right rotating shaft and the right slider 140 rotate relatively.

Still referring to the perspective view in fig. 2, when the sliders 140 on the left and right sides stop sliding, under the action of the first return spring 560 and the second return spring 570, the slider 140 on the left side tends to move upward, the slider 140 on the right side tends to move downward, and the rotation shaft rotates reversely, which drives the one-way bearing 550 to rotate reversely, and the slider 140 cannot rotate in the sliding cavity 130, so that the rotation shaft cannot drive the slider 140 to rotate reversely, and the gears 510 on the left and right sides cannot rotate reversely, and the gears 510 on the left and right sides remain in a static state, that is: the left and right sliders 140 are kept in a static state, and the first pull rod 200 and the second pull rod 300 are kept in a static state, so that the welding process is prevented from being influenced by random position changes of the first pull rod 200 and the second pull rod 300.

After the pipe welding is completed, the adjusting screw 440 is reversed such that the support plate 430 of the support device 400 is spaced apart from the pipe, and then the support device 400 is removed from the first and second tie rods 200 and 300, and the locking nut 170 of each connecting bolt 160 is reversed such that the first and second clamping assemblies 110 and 120 of each clamping device 100 are spaced apart from each other to remove the clamping device 100 from the pipe. Meanwhile, the reset rod 530 of the self-positioning device 500 is pulled, so that the arc-shaped rack 520 moves in a direction away from the pipeline, the arc-shaped rack 520 is disengaged from the gear 510, and the gear 510 is released from the limit of the arc-shaped rack 520, so that the sliders 140 on both sides can return to the initial positions under the action of the first and second reset springs 560 and 570, respectively, and the reset of the first and second pull rods 200 and 300 is realized.

This pipeline centre gripping equipment for welding simple structure, volume and weight are less, have not only reduced cost of transportation and construction cost, moreover, can not lose its use value because the pipeline position is higher yet at the job site, and the facilitate promotion is used.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

In the above embodiments, the descriptions of the orientations such as "up", "down", "left", "right", "side", "counterclockwise", etc. are based on the drawings.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. The pipe clamping equipment for welding is characterized by comprising two groups of clamping devices (100) which are arranged at intervals in the axial direction of a pipe, wherein each group of clamping devices (100) comprises a first clamping assembly (110) and a second clamping assembly (120), and a clamping space (180) for clamping the pipe is formed between each first clamping assembly (110) and the corresponding second clamping assembly (120); the first clamping assemblies (110) in the two groups of clamping devices (100) are opposite along the axial direction, a first pull rod (200) is connected between the two first clamping assemblies (110), the second clamping assemblies (120) in the two groups of clamping devices (100) are opposite along the axial direction, and a second pull rod (300) is connected between the two second clamping assemblies (120); a limiting component (600) is arranged in the clamping space (180) of each of the two groups of clamping devices (100), and the limiting component (600) is configured to prevent the pipeline from sliding along a set direction, wherein the set direction is a direction in which one of the two groups of clamping devices (100) deviates from the other in the axial direction of the pipeline; two ends of the first pull rod (200) are respectively connected with the two first clamping assemblies (110) in a sliding manner, two ends of the second pull rod (300) are respectively connected with the two second clamping assemblies (120) in a sliding manner, and the movement tracks of the first pull rod (200) and the second pull rod (300) move along the circumferential direction of the pipeline and synchronously move; the first pull rod (200) and the second pull rod (300) are spaced from the outer circumferential surface of the pipeline along the radial direction of the pipeline; the welding pipe gripping apparatus further comprises a self-positioning device (500), the self-positioning device (500) being configured to fix the first and second tie rods (200, 300) when the first and second tie rods (200, 300) are moved to a set position;

each first clamping assembly (110) and each second clamping assembly (120) are provided with a sliding cavity (130), the trend of the sliding cavity (130) is along the circumferential direction of the pipeline, two ends of the first pull rod (200) and two ends of the second pull rod (300) respectively extend into the corresponding sliding cavities (130), and each sliding cavity (130) is provided with the self-positioning device (500); the self-positioning device (500) comprises a gear (510), an arc-shaped rack (520), a reset rod (530) and a limiting spring (540), wherein the gear (510) is only installed at the end part of a corresponding pull rod in a one-way rotating manner, the arc-shaped rack (520) is movably installed in the sliding cavity (130), the moving direction of the arc-shaped rack (520) is along the radial direction of the pipeline, the concave part of the arc-shaped rack (520) faces the pipeline, the tooth shape of the arc-shaped rack (520) is arranged in the concave part of the arc-shaped rack, and the gear (510) is in meshing transmission with the arc-shaped rack (520); the reset rod (530) is fixedly connected to the protruding part of the arc-shaped rack (520), the reset rod (530) extends out of the corresponding sliding cavity (130), the limit spring (540) is sleeved on the reset rod (530), and the limit spring (540) is configured to enable the arc-shaped rack (520) to always have a motion trend of abutting and meshing with the gear (510); the self-positioning device (500) further comprises a first return spring (560) and a second return spring (570), the first return spring (560) is arranged at each end of the first pull rod (200), one end of the first return spring (560) is used for being connected with the first clamping assembly (110), the other end of the first return spring (560) is used for being connected with the first pull rod (200), and when the gear (510) of the self-positioning device (500) arranged corresponding to the first pull rod (200) is separated from the arc-shaped rack (520), the first return spring (560) is configured to return the first pull rod (200); the two ends of the second pull rod (300) are respectively provided with the second return spring (570), one end of the second return spring (570) is used for being connected with the second clamping assembly (120), the other end of the second return spring (570) is used for being connected with the second pull rod (300), and when the gear (510) of the self-positioning device (500) correspondingly arranged with the second pull rod (300) is separated from the arc-shaped rack (520), the second return spring (570) is configured to enable the second pull rod (300) to be reset.

2. The welding pipe clamping device according to claim 1, wherein the spacing assembly (600) comprises a plurality of friction blocks (610) arranged at intervals in a circumferential direction of the clamping space (180), the plurality of friction blocks (610) being configured to contact an outer circumferential surface of the pipe; the first clamping assembly (110) comprises a first clamping seat (111), the second clamping assembly (120) comprises a second clamping seat (121), the first clamping seat (111) and the second clamping seat (121) are both provided with the friction block (610), wherein the friction block (610) is movably arranged on the corresponding clamping seat and can be gradually close to the axis of the pipeline along the set direction after being moved.

3. The pipe clamping device for welding according to claim 2, characterized in that the friction block (610) is mounted on the corresponding clamping seat through a mounting seat (620), the mounting seat (620) is provided with a mounting cavity (621), a guide rod (630) is fixedly arranged in the mounting cavity (621), and the guide rod (630) extends and inclines towards the direction close to the axis of the pipe along the set direction; the friction block (610) is provided with a guide hole (611), the guide rod (630) penetrates through the guide hole (611), and the guide rod (630) is configured to guide the friction block (610) to move.

4. The welding pipe gripping apparatus according to claim 3, wherein the stop assembly (600) further comprises a reset element (640), the reset element (640) connected between the friction block (610) and the mount (620), the reset element (640) configured to reset the friction block (610) when the friction block (610) is separated from the outer circumferential surface of the pipe.

5. The welding pipe gripping apparatus of claim 3, wherein the mounting seats (620) are rotatably mounted to the respective gripping seats, the axis of rotation of the mounting seats (620) being parallel to the set direction.

6. The welding pipe gripping device of claim 2, wherein a face of the friction block (610) facing the gripping space (180) is an arcuate concave surface configured to be in abutting contact with an outer circumferential surface of the pipe.

7. The welding pipe gripping apparatus according to any of claims 1-6, further comprising a support device (400), the support device (400) being disposed between two sets of the gripping devices (100), the support device (400) being configured to support the pipe; the support device (400) connects the first pull rod (200) and the second pull rod (300), the support device (400) being further configured to move the first pull rod (200) and the second pull rod (300) synchronously.

8. The welding pipe gripping apparatus according to claim 7, wherein the supporting device (400) comprises a supporting base (410), an arc-shaped sliding bar (420) and a supporting plate (430), wherein the supporting base (410) is provided with an arc-shaped channel (411), the arc-shaped sliding bar (420) is slidably disposed in the arc-shaped channel (411), a first end of the arc-shaped sliding bar (420) is hooked with the first pull rod (200), and a second end of the arc-shaped sliding bar (420) is hooked with the second pull rod (300); the pallet (430) is liftably mounted to the support base (410), the pallet (430) being configured to support the pipeline.

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