A pipe clamping device and a pipe welding system

Abstract

A pipe clamping device for a pipe welding system, comprising a displacement mechanism and a tail cap mechanism, the displacement mechanism comprising a first support assembly and a clamping assembly, the clamping assembly being provided on the first support assembly, a pipe to be welded being clamped in the clamping assembly, the first support assembly having an opening allowing the pipe to be welded clamped in the clamping assembly to pass through the displacement mechanism; the tail cap mechanism comprising a tail cap assembly for end-tightening of the pipe to be welded; wherein the tail cap assembly provides an air inlet channel, which is in communication with the inside of the pipe to be welded when the tail cap assembly is tightened against the end of the pipe to be welded, so that protective gas can enter the inside of the pipe to be welded from the air inlet channel to inflate and assist in providing a pipe welding system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe welding, in particular to a pipe clamping device and a pipe welding system. BACKGROUND

[0002] At present, in the nuclear power, thermal power and other industries, when welding small pipes such as instrument pipes, due to the many specifications of the two pipes to be connected, the current method is still to use manual method to weld such small caliber pipes, and the welding effect is very dependent on the operation level of the welder. In order to reduce this requirement, many automatic welding equipment has appeared on the market. However, most of the solutions for inflating the inside of the pipe to be welded are designed to inflate from the back of the positioner. This inflation solution cannot meet the needs of long pipes that need to pass through the positioner completely. SUMMARY

[0003] An object of the present application is to provide a pipe clamping device that allows the pipe to be welded to pass through the positioner, meeting the welding needs of long pipes.

[0004] The pipe clamping device described above is used in a pipe welding system, which includes a positioner, a tail top mechanism, and a first support assembly. The positioner includes a first support assembly and a clamping assembly, the clamping assembly is arranged on the first support assembly, the pipe to be welded can be clamped in the clamping assembly, and the first support assembly has an opening that allows the pipe to be welded clamped in the clamping assembly to pass through the positioner. The tail top mechanism includes a tail top assembly for pressing the end of the pipe to be welded. The tail top assembly provides an air inlet channel that communicates with the inside of the pipe to be welded when the tail top assembly is pressed against the end of the pipe to be welded, so that the protective gas can enter the inside of the pipe to be welded from the air inlet channel for inflation.

[0005] In one or more embodiments, the clamping assembly includes a drive assembly and a clamping piece for clamping the pipe to be welded, and the drive assembly can drive the clamping piece to rotate around the axis of the pipe to be welded. The tail top mechanism further includes a second support assembly, and the tail top assembly is rotatably arranged on the second support assembly, so that the tail top assembly can rotate around the axis of the pipe to be welded. During the welding process, the drive assembly drives the clamping piece to rotate the pipe to be welded and drives the tail top assembly to rotate together.

[0006] In one or more embodiments, the second supporting assembly comprises an adapter assembly, the tail top assembly is rotatably connected with the adapter assembly; the adapter assembly provides an airflow channel, two ends of the airflow channel are respectively connected with the air inlet channel and the gas supply device, so that the protective gas can enter the airflow channel and the air inlet channel from the gas supply device in sequence to inflate the inside of the pipeline to be welded.

[0007] In one or more embodiments, the clamping member is a three-jaw chuck to clamp the pipeline to be welded; the driving assembly comprises a driving motor and a control unit, the driving motor is drivingly connected with the three-jaw chuck, and the rotational speed of the three-jaw chuck can be adjusted by controlling the rotational speed of the driving motor through the control unit.

[0008] In one or more embodiments, the first supporting assembly comprises a pitch angle adjusting mechanism, the pitch angle adjusting mechanism comprises an adjusting wheel and a turnover adjusting mechanism, an output shaft is arranged on the turnover adjusting mechanism, and the clamping assembly is connected with the first supporting assembly through the output shaft; wherein the adjusting wheel is drivingly connected with the turnover adjusting mechanism, and rotating the adjusting wheel can drive the output shaft to rotate, and further drive the clamping assembly to rotate, so as to adjust the pitch angle of the pipeline to be welded.

[0009] In one or more embodiments, the tail top assembly comprises a pressing assembly and a bearing assembly, so that the pressing assembly can rotate around the axis of the pipeline to be welded; the pressing assembly comprises a tail top block and a rotating middle shaft, the air inlet channel comprises a first air inlet channel arranged on the tail top block and a second air inlet channel arranged on the rotating middle shaft, and the first air inlet channel and the second air inlet channel are connected in communication; the inner ring of the bearing assembly is connected with the rotating middle shaft, the outer ring of the bearing assembly is fixed on a bearing cylinder and connected with the second supporting assembly, so that the tail top block and the rotating middle shaft can rotate around the axis of the pipeline to be welded; wherein the tail top block is conical and is sleeved on one end of the rotating middle shaft close to the pipeline to be welded, so that part of the tail top block can extend into the inside of the pipeline to be welded for inflation, and the tail top block is driven to rotate by the pipeline to be welded.

[0010] In one or more embodiments, the pressing assembly further comprises a spring, a first end face is arranged on the tail top block, a second end face is arranged on the rotating middle shaft, one end of the spring is in contact with the first end face, and the other end of the spring is in contact with the second end face, so as to elastically support the tail top block on the rotating middle shaft.

[0011] In one or more embodiments, the tail top block is provided with an annular table, which is sleeved on the rotating middle shaft; the top tightening assembly further comprises a limiting mechanism, which comprises a limiting pin, a through hole provided on the annular table, and a sliding groove provided on the outer circumferential surface of the rotating middle shaft along the axial direction, the limiting pin passes through the through hole and is in contact with the sliding groove and is movable in the sliding groove to limit the tail top block in the axial direction.

[0012] In one or more embodiments, the tail top block is sleeved on one end of the rotating middle shaft, a plurality of grooves are provided on the first end surface of the tail top block along the axial direction, and a plurality of pin shafts corresponding to the plurality of grooves are provided on the rotating middle shaft.

[0013] In one or more embodiments, the first gas inlet channel and the second gas inlet channel are respectively provided on the tail top block and the rotating middle shaft along the axial direction of the welded pipe; the pipe clamping device further comprises a concentricity adjusting mechanism, the concentricity adjusting mechanism comprises a calibration piece and a laser device, the calibration piece is clamped on the clamping piece and is provided concentrically with the welded pipe, and the laser device is provided on the second supporting assembly, so that laser can pass through the first gas inlet channel and the second gas inlet channel to calibrate the position of the tail top assembly.

[0014] When the above-mentioned pipe clamping device is used for welding a long pipe, one end of the pipe to be welded can pass through the back of the displacement mechanism from the opening on the first supporting assembly, the pipe body is clamped by the clamping assembly, the other end is tightened by the tail top assembly, and the inside of the pipe is inflated, the pipe clamping device moves the gas supply device originally located in the displacement mechanism to the outside of the device and communicates with the tail top assembly, so that the protective gas can enter the pipe to be welded from the gas inlet channel, avoiding the problem that the pipe welding system has a large volume due to the fact that one end of the pipe cannot pass through the displacement mechanism during pipe welding, and the overall structure of the pipe welding system can be more compact.

[0015] Another object of the present application is to provide a pipe welding system, which enables the pipe to be welded to pass through the displacement mechanism and meet the welding requirements of long pipes.

[0016] The above-mentioned pipe welding system comprises a pipe to be welded, a pipe welding device, and the above-mentioned pipe clamping device, the pipe to be welded is clamped and fixed by the pipe clamping device, and the pipe welding device is used for welding.

[0017] The pipeline clamping device of the pipeline welding system moves the gas supply device originally located inside the positioner to the outside of the device, is connected with the tail top assembly, and enables the protective gas to enter the pipeline to be welded from the air inlet channel, thereby avoiding the problem of large size of the pipeline welding system due to the fact that one end of the pipeline cannot pass through the positioner during pipeline welding, and the overall structure of the pipeline welding system can be more compact. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other features, properties, and advantages of the present application will become more apparent by reference to the following description of embodiments thereof in conjunction with the accompanying drawings in which:

[0019] Figure 1 is a perspective view of a pipeline clamping device according to an embodiment.

[0020] Figure 2 is a perspective view of a positioner according to an embodiment.

[0021] Figure 3 is a perspective view of a tail top mechanism according to an embodiment.

[0022] Figure 4 is a sectional view of a positioner according to an embodiment.

[0023] Figure 5 is a side view of a clamping assembly according to an embodiment.

[0024] Figure 6 is a top view of a clamping assembly according to an embodiment.

[0025] Figure 7 is a perspective view of a first support assembly according to an embodiment.

[0026] Figure 8 is a sectional view of a first support assembly according to an embodiment.

[0027] Figure 9 is a schematic view of a positioner adjusting the pitch angle of a pipeline to be welded according to an embodiment.

[0028] Figure 10 is a sectional view of a tail top mechanism according to an embodiment.

[0029] Figure 11 is a perspective view of a pipeline clamping device performing laser calibration according to an embodiment.

[0030] Figure 12 is a partial enlarged view of a tail top mechanism according to an embodiment.

[0031] Figure 13 is a schematic view of a sealing assembly according to an embodiment.

[0032] Figure 14 This is a schematic diagram of a limiting mechanism according to one embodiment. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description to provide a full understanding of the invention. However, the invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual applications without departing from the spirit of the invention. Therefore, the scope of protection of the invention should not be limited by the content of these specific embodiments. It should be noted that these and subsequent accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the actual scope of protection claimed by the invention.

[0034] Existing automated welding equipment mostly employs a design where shielding gas is injected into the welded pipe from the back of the positioning mechanism. During welding, a clamping component at the front of the positioning mechanism holds one end of the pipe to be welded, and shielding gas is supplied from the rear of the positioning mechanism through the pipe end, thus achieving the inflation function. This inflation method is unusable when the pipe to be welded is too long, requiring it to pass through the positioning mechanism, or it results in the welding equipment occupying a large space. Therefore, there is a need for a welding system specifically designed for welding long pipes.

[0035] The pipe welding system includes the pipe to be welded, the pipe welding apparatus, and the pipe clamping device. The pipe clamping device holds and fixes the pipe to be welded, and the pipe welding apparatus is used to weld the pipe. The pipe welding system also includes a gas supply device to provide the shielding gas required for welding.

[0036] like Figures 1 to 4 The pipe clamping device shown is used in a pipe welding system and includes a displacement mechanism 1 and a tail-end mechanism 2. The structure of the displacement mechanism 1 is as follows: Figure 2 As shown, it includes a first support assembly 3 and a clamping assembly 4. The clamping assembly 4 is disposed on the first support assembly 3, and the pipe 5 to be welded can be clamped in the clamping assembly 4. The first support assembly 3 has an opening 31, which allows the pipe 5 to be welded, clamped in the clamping assembly 4, to pass through the displacement mechanism 1. The structure of the tail-top mechanism 2 is as follows. Figure 3 As shown, it includes a tail-top assembly 6, which is used to tighten the end of the pipe 5 to be welded. The tail-top assembly 6 provides an air inlet channel. When the tail-top assembly 6 is tightened at the end of the pipe 5 to be welded, the air inlet channel is connected to the inside of the pipe 5 to be welded, so that protective gas can enter the inside of the pipe 5 to be welded from the air inlet channel for inflation.

[0037] When welding long pipes using the aforementioned pipe clamping device, one end of the pipe 5 to be welded can...Figure 4 The pipe clamping device is capable of moving the gas supply device originally inside the position changing mechanism 1 to the outside of the device, and connecting the tail abutting assembly 6, so that the protective gas can enter the pipe 5 to be welded from the air inlet channel, avoiding the problem of large size of the pipe welding system due to the fact that one end of the pipe cannot pass through the position changing mechanism 1 during pipe welding, and the overall structure of the pipe welding system can be more compact.

[0038] In Figure 1 In one embodiment shown, in order to realize the rotation of the pipe during welding so as to weld in the circumferential direction of the pipe, the clamping assembly 4 comprises a driving assembly 41 and a clamping piece 42, the clamping piece 42 is used to clamp the pipe 5 to be welded, and the driving assembly 41 is capable of driving the clamping piece 42 to rotate around the axis of the pipe 5 to be welded, and the tail abutting mechanism 2 further comprises a second support assembly 7, and the tail abutting assembly 6 is rotatably arranged on the second support assembly 7, so that the tail abutting assembly 6 can rotate around the axis of the pipe 5 to be welded, during welding, the driving assembly 41 drives the clamping piece 42 to rotate the pipe 5 to be welded and drives the tail abutting assembly 6 to rotate together, and the protective gas can enter the pipe 5 to be welded from the air inlet channel to be inflated. The contact surface between the tail abutting assembly 6 and the pipe has a certain roughness to ensure that the tail abutting assembly 6 can rotate together with the pipe, and the roughness can be provided by the material or structure of the contact surface, for example, a convex part can be arranged on the tail abutting assembly 6, and a corresponding concave part can be arranged on the pipe 5 to be welded, and the pipe 5 to be welded can drive the tail abutting assembly 6 to rotate together through the cooperation of the convex part and the concave part, or the part of the tail abutting assembly 6 in contact with the pipe is made of a material capable of providing a certain friction so that the pipe 5 to be welded can drive the tail abutting assembly 6 to rotate together.

[0039] The second support assembly 7 comprises an adapter assembly 71, the adapter assembly 71 is connected with the external gas supply device, the tail abutting assembly 6 is rotatably connected with the adapter assembly 71, and the adapter assembly 71 provides a gas flow channel 761, two ends of the gas flow channel 761 are connected with the air inlet channel and the gas supply device respectively, so that the protective gas can enter the gas flow channel 761 and the air inlet channel from the gas supply device in sequence to inflate the inside of the pipe 5 to be welded.

[0040] In this embodiment, the second support assembly 7 further comprises a position adjusting assembly 73, and the tail abutting assembly 6 and the adapter assembly 71 are fixed on the position adjusting assembly 73 to adjust the position of the tail abutting assembly 6 in the horizontal and vertical directions.

[0041] The structure of the position adjusting assembly 73 is as shown in Figure 3As shown, the tail top assembly 6 and the adapter assembly 71 are connected with the position adjusting assembly 73 through the connecting plate 74, and the position adjusting assembly 73 includes a screw rod assembly 731, a lifting platform 732, and a horizontal position adjusting plate 733, so that the tail top assembly 6 is movable in multiple directions. The tail top mechanism 2 and the position adjusting mechanism 1 can be positioned and fixed on the same plane through bolts, the tail top assembly 6 is adjusted in the horizontal X direction through the screw rod assembly 731, the tail top assembly 6 is adjusted in the vertical direction through the lifting platform 732, and the tail top assembly 6 is adjusted in the horizontal Y direction through the horizontal position adjusting plate 733, so that the rotating shaft of the tail top mechanism 2 is concentric with the rotating shaft of the position adjusting mechanism 1, the concentricity of the two shafts can effectively prevent the tail top assembly 6 from rotating with the pipeline 5 from shaking greatly, reduce the wear of the contact surface between the tail top assembly 6 and the pipeline, and improve the service life.

[0042] In an embodiment, the clamping part 42 is a three-jaw chuck 42 for clamping the pipeline 5 to be welded, and the driving assembly 41 includes a driving motor and a control unit, the driving motor is in transmission connection with the three-jaw chuck 42, and the rotation speed of the driving motor is controlled by the control unit to adjust the rotation speed of the three-jaw chuck 42.

[0043] For details, please refer to Figure 5 and Figure 6 The clamping assembly 4 includes a clamping assembly shell 43, a shell adapter flange 44, a cylindrical pin 45, a three-jaw chuck 42, a three-jaw chuck adapter flange 46, a rotating table 47, and a driving motor. The clamping assembly shell 43 has a cover plate 431 and two side walls 432, the shell adapter flange 44 is arranged on the two side walls 432 of the shell, the shell adapter flange 44 is provided with a connecting hole, and the first supporting assembly 3 is provided with a corresponding connecting hole, so that the clamping assembly 4 and the first supporting assembly 3 can be fixedly connected through the cylindrical pin 45. The three-jaw chuck 42 is arranged on the three-jaw chuck adapter flange 46 to clamp the pipeline. The rotating table 47 is rotatably arranged on the clamping assembly shell 43, the front end of the rotating table 47 is rigidly connected with the three-jaw chuck adapter flange 46, and the rear end is connected with the output end of the driving motor. The rotation speed of the output end of the driving motor is controlled by the control unit to adjust the rotation speed of the three-jaw chuck 42, so as to meet the needs of different welding speeds.

[0044] In an embodiment, the first supporting assembly 3 includes a pitch angle adjusting mechanism, the pitch angle adjusting mechanism includes an adjusting wheel 32 and a turnover adjusting mechanism 33, the turnover adjusting mechanism 33 is provided with an output shaft 34, and the clamping assembly 4 is connected with the first supporting assembly 3 through the output shaft 34. The adjusting wheel 32 is in transmission connection with the turnover adjusting mechanism 33, rotating the adjusting wheel 32 can drive the output shaft 34 to rotate, and then drive the clamping assembly 4 to rotate, so as to adjust the pitch angle of the pipeline 5 to be welded.

[0045] Reference can be made to Figure 7 and Figure 8 The first support assembly 3 comprises a first support assembly housing 30, an adjusting wheel 32, an adjusting wheel shaft 321, a worm gear reducer 33 (i.e. a flip adjustment mechanism), an output shaft 34, a follower shaft 35, and a bearing 36. An opening 31 is provided on the rear wall surface of the first support assembly housing 30 to allow the pipe 5 to pass through the displacement mechanism 1. The adjusting wheel 32 and the worm gear reducer 33 are arranged on one side wall surface of the first support assembly housing 30. The adjusting wheel 32 is rotatably arranged on the wall surface. Rotating the adjusting wheel 32 can drive the worm gear reducer 33 to rotate through the adjusting wheel shaft 321, and then drive the output shaft 34 of the worm gear reducer 33 to rotate, thereby adjusting the angle of the pipe 5 to be welded, as shown in Figure 9 The follower shaft 35 is rotatably arranged on the other side wall surface of the first support assembly housing 30 through the bearing 36, and is coaxially arranged with the output shaft 34. The output shaft 34 and the follower shaft 35 are both provided with the aforementioned connecting holes for connecting the clamping assembly 4 and the first support assembly 3. By adjusting the rotating speed of the adjusting wheel shaft 321 through the flip adjustment mechanism 33, the rotating speed at the output shaft 34 is reduced, which can achieve more accurate angle adjustment of the clamping assembly 4 and is convenient for operation and use.

[0046] In this embodiment, the first support assembly 3 further comprises a pitch angle indicator 37 arranged on the first support assembly housing 30. The angle between the clamping assembly 4 and the horizontal plane is displayed by the pointer 38 on the pitch angle indicator 37.

[0047] The first support assembly 3 of the displacement mechanism 1 in the above embodiment can not only support the clamping assembly 4, but also adjust the pitch angle of the clamping assembly 4. In general welding, the pipe body part of the pipe 5 to be welded is stably clamped by the three-jaw chuck 42, the center axis of the three-jaw chuck 42 is kept horizontal, and the other end of the pipe is tightly clamped by the tail top mechanism 2, so as to fix the pipe 5 to be welded in the horizontal direction, and the protective gas can enter the pipe from the air inlet channel. In special cases, such as the implementation of socket welding, the pipe 5 to be welded needs to be kept in an inclined state, and the pitch angle of the three-jaw chuck 42 can be adjusted by rotating the adjusting wheel 32 to fix the pipe in an inclined position.

[0048] In one embodiment, the tail head assembly 6 comprises a head pressing assembly 61 and a bearing assembly 62, so that the head pressing assembly 61 can rotate around the axis of the pipe 5 to be welded. The head pressing assembly 61 comprises a tail head block 63 and a rotating shaft 64, and the intake passage comprises a first intake passage 631 arranged on the tail head block 63 and a second intake passage 641 arranged on the rotating shaft 64, and the first intake passage 631 and the second intake passage 641 are connected in communication. The inner ring of the bearing assembly 62 is connected with the rotating shaft 64, and the outer ring of the bearing assembly 62 is fixed on the bearing cylinder 65 and connected with the second support assembly 7, so that the tail head block 63 and the rotating shaft 64 can rotate around the axis of the pipe 5 to be welded. Among them, the tail head block 63 is conical, and is sleeved on one end of the rotating shaft 64 close to the pipe 5 to be welded, so that part of the tail head block 63 can extend into the inside of the pipe 5 to be welded for inflation, and the tail head block is driven to rotate by the pipe 5 to be welded.

[0049] For details, please refer to Figure 10 The tail head block 63 and the rotating shaft 64 both have a hollow structure to form the first intake passage 631 and the second intake passage 641 in communication, respectively. The tail head block 63 is sleeved on one end of the rotating shaft 64, a plurality of grooves 632 are formed on the first end surface of the tail head block 63 in the axial direction, a plurality of pin shafts 67 are arranged on the rotating shaft 64, and the plurality of pin shafts 67 can be matched with the plurality of grooves 632, respectively. The cooperation of the pin shafts 67 and the grooves 632 can ensure the coaxiality of the tail head block 63 and the rotating shaft 64, and prevent eccentricity between the two during welding rotation. The inner ring of the bearing assembly 62 is sleeved on the rotating shaft 64, the outer ring is fixed on the bearing cylinder 65, and the bearing assembly 62 is fixedly connected to the second support assembly 7 through the bearing mounting seat 68, so that the pipe 5 to be welded can drive the tail head block 63 and the rotating shaft 64 to rotate together during welding.

[0050] In this embodiment, the adapter assembly 71 comprises a tee fixed seat 75 and an adapter flange 76, the adapter flange 76 is sleeved on one end of the tee fixed seat 75 close to the tail head assembly 6 and is fixedly connected with the bearing cylinder 65, the rotating shaft 64 is rotatable relative to the adapter flange 76 and the interiors of the two are connected in communication. Specifically, the adapter assembly 71 has an air inlet 72 for connecting an external gas supply device, and the airflow passage 761 on the adapter assembly 71 comprises an airflow passage formed in the interior of the adapter flange 76 and an airflow passage formed in the cavity of the tee fixed seat 75, so that the second intake passage 641 can be connected in communication with the air inlet 72. The protective gas can enter the airflow passage 761 in the interior of the adapter flange 76 and the cavity of the tee fixed seat 75 from the air inlet 72 of the external gas supply device in the direction indicated by the arrow in the figure, and then pass through the second intake passage 641 and the first intake passage 631 on the tail head assembly 6 in sequence, so as to realize the inflation of the inside of the pipe 5 to be welded and improve the welding quality. Figure 10 ​

[0051] As Figure 10 shown, the top-tight assembly 61 further comprises a spring 66, the tail block 63 is provided with a first end surface 630, the rotating shaft 64 is provided with a second end surface 640, one end of the spring 66 is in contact with the first end surface 630, and the other end is in contact with the second end surface 640, so that the tail block 63 is elastically supported on the rotating shaft 64 in the axial direction, so that the tail block 63 can keep the end of the pipe 5 to be welded, and the compression degree of the spring 66 will change according to the size of the top-tight force, so as to avoid the leakage of protective gas during welding.

[0052] The end surface of the tail block 63 is further provided with an annular table 633, and the annular table 633 is sleeved on the rotating shaft 64, as Figure 14 shown, the top-tight assembly 61 further comprises a limiting mechanism 611, the limiting mechanism 611 comprises a limiting pin 612, a through hole opened on the annular table 633, and a sliding groove 613 opened on the outer circumferential surface of the rotating shaft 64 in the direction of the pipe axis, the limiting pin 612 passes through the through hole and is in contact with the sliding groove 613, and is movable in the sliding groove 613, so as to limit the tail block 63 in the axial direction, and define the range of relative movement of the tail block 63 and the rotating shaft 64, so as to ensure that the tail block 63 will not be popped out of the rotating shaft 64 by the spring 66.

[0053] In one embodiment, the tail block assembly 6 further comprises a sealing assembly 10, which seals the top-tight assembly 61 and the bearing assembly 62. For details, please refer to Figure 12 and Figure 13 Since the rotating shaft 64 is rotatable relative to the adapter flange 76, and there is no direct sealing structure between the two, during the inflation of the protective gas, most of the protective gas will enter the second gas inlet channel 641 in the direction shown by arrow A in Figure 12 , but a small part of the protective gas will enter the bearing cylinder cavity 69 in the direction shown by arrow B, so it is necessary to seal the top-tight assembly 61 and the bearing assembly 62 to avoid the leakage of the protective gas from the front end of the bearing cylinder cavity 69 (the front end is the end close to the tail block 63), causing waste of the protective gas.

[0054] As Figure 13 shown, in this embodiment, the sealing assembly 10 comprises a sealing ring 101 and a sealing gland 102, the sealing ring 101 is arranged on the sealing gland 102, and the sealing gland 102 is fixed on the front end of the bearing cylinder 65 by a fastener, this sealing method belongs to contact sealing, and the sealing property is high. In addition, since the inner side of the sealing ring 101 and the sealing gland 102 needs to be in contact with the rotating shaft 64 to ensure the sealing property, the sealing ring 101 and the sealing gland 102 will slide and rub with the rotating shaft 64 during the rotary welding process, and grease can be added at the contact position of the sealing ring 101 and the sealing gland 102 with the rotating shaft 64 to reduce the wear and tear and improve the service life.

[0055] In Figure 10 In the embodiment shown, the first air inlet channel 631 and the second air inlet channel 641 are respectively formed on the tail block 63 and the rotating central shaft 64 along the axis direction of the pipe to be welded. The pipe clamping device further comprises a concentricity adjusting mechanism, which comprises a calibration piece 8 clamped on the clamping piece 42 and arranged concentrically with the pipe to be welded 5, and a laser device 9 arranged on the second support assembly 7, so that the laser can pass through the first air inlet channel 631 and the second air inlet channel 641 to calibrate the position of the tail block assembly 6.

[0056] As Figure 11 shown, when it is found that the rotation center of the tail block 63 is not coaxial with the rotation center of the pipe to be welded 5, the calibration piece 8 is clamped on the three-jaw chuck 42, and the adjusting wheel 32 is adjusted so that the rotation center of the three-jaw chuck 42 is in a horizontal position. The laser device 9 is turned on, and the laser will pass through the cavity inside the three-way fixed seat 75 from the rear and irradiate the laser to the calibration piece 8 from the front. According to the situation, the position adjusting assembly 73 (including the screw assembly 731, the lifting platform 732 and the horizontal position adjusting plate 733) is operated to adjust the tail block assembly 6 in the horizontal and vertical directions, so as to ensure that the laser is aligned with the target position of the calibration piece 8. The position adjusting assembly 73 is locked in the calibrated position, and the concentricity calibration of the displacement mechanism 1 and the tail block mechanism 2 is completed. The purpose of adjusting the position of the tail block assembly 6 by the above-mentioned method is to prevent the tail block 63 from being worn too much when it rotates with the pipe to be welded 5, and to prevent the rotating central shaft 64 from shaking too much when it rotates, thereby preventing damage to the parts and improving the service life of the device.

[0057] Although the present application has been disclosed with reference to the preferred embodiments above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not deviate from the technical solutions of the present application, falls within the protection scope defined by the claims of the present application.

Claims

1. A pipe clamping device for a pipe welding system, characterized in that, include: A displacement mechanism includes a first support assembly and a clamping assembly, the clamping assembly being disposed on the first support assembly, and a pipe to be welded being clamped in the clamping assembly. The first support assembly has an opening that allows the pipe to be welded, clamped in the clamping assembly, to pass through the displacement mechanism. A tail-top mechanism, including a tail-top assembly, the tail-top assembly being used to clamp the end of the pipe to be welded; The tail-top assembly provides an air intake channel. When the tail-top assembly is pressed against the end of the pipe to be welded, the air intake channel communicates with the inside of the pipe to be welded, so that protective gas can enter the inside of the pipe to be welded from the air intake channel for inflation. The clamping assembly includes a driving assembly that can drive the clamping member to rotate about the axis of the pipe to be welded. The tail-top mechanism further includes a second support component, which is rotatably mounted on the second support component, allowing the tail-top component to rotate around the axis of the pipe to be welded. During the welding process, the drive component drives the clamping member to rotate the pipe to be welded, and also drives the tail-top component to rotate together. The tail-top assembly includes a clamping assembly and a bearing assembly, enabling the clamping assembly to rotate around the axis of the pipe to be welded. The clamping assembly includes a tail-top block and a rotating central shaft. The clamping assembly also includes a spring. The tail block has a first end face, and the rotating central shaft has a second end face. One end of the spring contacts the first end face, and the other end contacts the second end face, so as to elastically support the tail block on the rotating central shaft. The tail block is provided with an annular platform, which is sleeved on the rotating central shaft; The clamping assembly further includes a limiting mechanism, which includes a limiting pin, a through hole on the annular platform, and a sliding groove on the outer circumferential surface of the rotating central shaft along the axial direction. The limiting pin passes through the through hole and contacts the sliding groove, and is movable within the sliding groove to limit the tail block in the axial direction. The tailstock is sleeved on one end of the rotating central shaft. Multiple grooves are formed along the axial direction on the first end face of the tailstock. Multiple corresponding pins are provided on the rotating central shaft. The multiple pins can respectively cooperate with the multiple grooves.

2. The pipe clamping device as described in claim 1, characterized in that, The clamping assembly includes a clamping member for clamping the pipe to be welded.

3. The pipe clamping device as described in claim 2, characterized in that, The second support component includes a connecting component, and the tail top component is rotatably connected to the connecting component; The adapter provides an airflow channel, the two ends of which are connected to the air inlet channel and the gas supply device, respectively, so that protective gas can enter the airflow channel and the air inlet channel from the gas supply device in sequence to fill the inside of the pipe to be welded.

4. The pipe clamping device as described in claim 2, characterized in that, The clamping device is a three-jaw chuck, used to clamp the pipe to be welded; The drive assembly includes a drive motor and a control unit. The drive motor is connected to the three-jaw chuck. The speed of the drive motor can be adjusted by controlling the speed of the three-jaw chuck through the control unit.

5. The pipe clamping device as described in claim 1, characterized in that, The first support assembly includes a pitch angle adjustment mechanism, which includes an adjustment wheel and a tilt adjustment mechanism. The tilt adjustment mechanism is provided with an output shaft, and the clamping assembly is connected to the first support assembly through the output shaft. The adjusting wheel is connected to the flipping adjustment mechanism. Rotating the adjusting wheel can drive the output shaft to rotate, which in turn drives the clamping assembly to rotate, thereby adjusting the pitch angle of the pipe to be welded.

6. The pipe clamping device as described in claim 2, characterized in that, The air intake channel includes a first air intake channel disposed on the tail block and a second air intake channel disposed on the rotating central shaft, wherein the first air intake channel and the second air intake channel are connected. The inner ring of the bearing assembly is connected to the rotating central shaft, and the outer ring of the bearing assembly is fixed on the bearing cylinder and connected to the second support assembly, so that the tail block and the rotating central shaft can rotate around the axis of the pipe to be welded. The tail top block is conical and is fitted onto one end of the rotating central axis near the pipe to be welded, so that part of the tail top block can extend into the pipe to be welded for inflation, and the pipe to be welded drives the tail top block to rotate.

7. The pipe clamping device as described in claim 6, characterized in that, The first air intake channel and the second air intake channel are respectively opened on the tail top block and the rotating central shaft along the axial direction of the welding pipe; The pipe clamping device further includes a concentricity adjustment mechanism, which includes a calibration component and a laser device. The calibration component is clamped on the clamping component and is concentrically arranged with the welded pipe. The laser device is arranged on the second support component so that the laser can pass through the first air intake channel and the second air intake channel to calibrate the position of the tail top component.

8. A pipe welding system, characterized in that, It includes a pipe to be welded, a pipe welding device, and a pipe clamping device as described in any one of claims 1 to 7, wherein the pipe to be welded is clamped and fixed by the pipe clamping device, and the pipe welding device is used for welding.

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