CN111451601B - Automatic rotary welding device for bending type pipe fittings - Google Patents
Automatic rotary welding device for bending type pipe fittings Download PDFInfo
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- CN111451601B CN111451601B CN202010362505.8A CN202010362505A CN111451601B CN 111451601 B CN111451601 B CN 111451601B CN 202010362505 A CN202010362505 A CN 202010362505A CN 111451601 B CN111451601 B CN 111451601B
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- rotary
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- pipe fitting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses an automatic rotary welding device for a bent pipe fitting, which comprises a supporting mechanism, a pull rod assembly arranged on the supporting mechanism and a rotary positioning mechanism arranged between the pull rod assembly and the supporting mechanism, wherein the rotary positioning mechanism comprises a rotary positioning mechanism body and a rotary positioning mechanism body; the rotary positioning mechanism comprises a support arranged on the supporting mechanism, a rotary component rotationally connected to the support, a driving component arranged on the supporting mechanism and used for driving the rotary component to rotate, and a pipe fitting centering component arranged on the rotary component, and the positioning center of the pipe fitting centering component and the center of the rotary component are positioned on the same central axis; the device uses reliably, and the simple operation according to the characteristics of aeroengine complicated space bending type, designs specific rotational positioning mechanism, and the pipeline can autogiration when welding aeroengine complicated space bending type and different diameter pipelines realizes that manual argon arc welding is in the open position and the number of times of starting to receive an arc is once, the effectual welding effect that has improved.
Description
Technical Field
The invention relates to the technical field of manufacturing of aero-engine components, in particular to an automatic rotary welding device for a bent pipe fitting.
Background
The external pipeline parts of the engine are more, the pipeline structure is complex, most pipelines are in a space curve type, and automatic welding is difficult to realize. The pipe and pipe joints need to be welded manually, the diameter phi 6 mm-phi 72mm of the pipeline welding structure is different, the thickness of the pipe wall is 1mm, welding seams need to be formed on two sides by single-side welding, and the welding seams on the back need to be controlled in excess height to ensure that the ball passing inside the pipeline is carried out smoothly. The argon arc welding is adopted for the structural welding of the pipes, because no proper welding tool exists, the welding can only adopt multi-section welding, the number of welding joints is large, and the arc starting and closing part of a welding line is easy to have defects, so that the welding percent of pass is low.
Disclosure of Invention
The invention aims to provide an automatic rotary welding device for a bent pipe fitting, which is used for solving the problem of poor welding performance of the bent pipe fitting in a complex space of the conventional engine.
The technical scheme for solving the technical problems is as follows: an automatic rotary welding device for a bent pipe fitting comprises a supporting mechanism, a pull rod assembly arranged on the supporting mechanism and a rotary positioning mechanism arranged between the pull rod assembly and the supporting mechanism;
the rotary positioning mechanism comprises a support arranged on the supporting mechanism, a rotating assembly rotationally connected to the support, a driving assembly arranged on the supporting mechanism and used for driving the rotating assembly to rotate, and a pipe fitting centering assembly arranged on the rotating assembly, wherein the positioning center of the pipe fitting centering assembly and the center of the rotating assembly are located on the same central axis.
The beneficial effects of adopting the above technical scheme are: the device is reliable in use, the operation is convenient, according to the characteristics of the complex space bending type of an aero-engine, the complex pipe fittings with different pipe diameters are reliably clamped and positioned through the pipe fitting centering assembly, the clamping is stable and reliable, the pipe fittings after being clamped and positioned are driven to rotate automatically through the rotating assembly, then the pipe fittings are subjected to rotating circumferential welding through the welding machine, the reliable welding of the bent pipe fittings with different specifications is realized, meanwhile, in the mode, only welding seams and pipe joints are to be welded on the side of a welder, the operation of the welder is not influenced, the service performance is good, manual argon arc welding is in a flat welding position, the arc starting and receiving times are one time, the welding effect is effectively improved, the welding seams are attractive in shape, the rejection rate of parts is reduced, and the production cost is greatly reduced.
Furthermore, the rotating assembly comprises a baffle arranged on the support, a fixed shaft arranged on the baffle and a rotating gear connected to the fixed shaft through a bearing, the pull rod assembly is connected between the baffle and the supporting mechanism, the pipe fitting centering assembly is arranged on the rotating gear, the positioning center of the pipe fitting centering assembly and the center of the rotating gear are located on the same central axis, and the rotating gear is connected with the driving assembly in a matched mode.
The beneficial effects of adopting the above technical scheme are: the baffle provides reliable fixed stay for the rotating gear, is convenient for the relative rotation between rotating gear and the fixed axle through the bearing, rotates smoothly. The rotary gear rotates under the driving action of the driving assembly, and then the pipe fitting centering assembly is driven to rotate along with the rotary gear, so that the pipe fitting clamped on the pipe fitting centering assembly can rotate automatically, and the welding performance of the pipe fitting is effectively improved.
Further, the driving assembly comprises an installation plate arranged on the supporting mechanism, a servo motor arranged on the installation plate, a speed regulator in communication connection with the servo motor and a main gear arranged on an output shaft of the servo motor, the main gear is meshed with the rotating gear, and a power switch used for controlling the start and stop of the servo motor and the speed regulator is arranged on the installation plate.
The beneficial effects of adopting the above technical scheme are: the mounting plate provides reliable support for the servo motor and reduces the influence of vibration generated in the working process of the servo motor on welding performance. The servo motor is matched with the speed regulator to realize stepless speed regulation, so that the rotating speed of the main gear is controlled, the rotating speed of the rotating gear is further controlled to be adjusted under the control of the speed of the main gear, and the welding reliability and the welding effect when different pipes are welded in actual processing are ensured through the adjustment of the speed.
Further, pipe fitting centering subassembly is including setting up respectively supporting mechanism is last and about the fixing base of rotary gear centrosymmetry, setting regulating block, cooperation connection on the fixing base in the regulating block and follow regulating block axial motion's regulation pole and the grip block of setting at the regulating rod tip, offer the centre gripping groove that is used for the centre gripping pipe fitting on the grip block, and the grip block setting is adjusting on the pole and is close to the tip at rotary gear center.
The beneficial effects of adopting the above technical scheme are: the fixing base provides reliable fixed stay for centering assembly, adjusts the pole and as adjusting the driving piece, drives the grip block motion under the effect of this regulation pole, and then adjusts the distance between two grip blocks, satisfies the centre gripping needs of different diameter pipe fittings, and is spacing to the circumference of pipe fitting through the centre gripping groove, improves the centre gripping location reliability to the pipe fitting, and then avoids because the centre gripping is unreliable to produce the welding effect that the slippage caused poor.
Furthermore, the outer wall of the adjusting rod is provided with spiral teeth, and a spiral groove matched with the spiral teeth is formed in the adjusting block.
The beneficial effects of adopting the above technical scheme are: through helical tooth and helicla flute cooperation, realize adjusting the removal of pole in the regulating block, only need adjust the pole through clockwise or anticlockwise rotation and can realize displacement regulation, the simple operation, reliable and stable, and its helical tooth has the auto-lock performance with the helicla flute cooperation, guarantees to the reliable centre gripping location of pipe fitting, avoids rotating the slippage in welding process.
Furthermore, the clamping groove is of a V-shaped structure.
The beneficial effects of adopting the above technical scheme are: through V type structure, further carry out circumference location to the pipe fitting, improve the location effect.
Furthermore, the size of the clamping groove is matched with the outer diameter of the pipe fitting.
Further, the supporting mechanism comprises a supporting base with a reserved space and a supporting frame arranged at the top end of the supporting base, the pull rod assembly is connected between the supporting frame and the baffle, and the mounting plate is arranged on the supporting base.
The beneficial effects of adopting the above technical scheme are: the device is reliably supported through the supporting base, the supporting frame provides stable support for fixing the pull rod assembly, and the reserved space is arranged, so that interference of other objects is avoided when the residual complex bent part in the pipeline rotates in the welding process, and the device is reliable and stable.
Further, the pull rod assembly comprises fixing pieces respectively arranged at the top end of the support frame and on the baffle plate and a pull rod hinged between the two fixing pieces.
The beneficial effects of adopting the above technical scheme are: the stationary blade articulates at the both ends of pull rod, can be convenient for adjust the fixed angle of pull rod through hinge structure, and then adjusts rotational positioning mechanism's position, the welding operation of the pipe fitting of being convenient for.
Further, the pull rod assemblies are two and are arranged in a central symmetry mode around the rotating gear.
The beneficial effects of adopting the above technical scheme are: through the symmetrical arrangement of position for the effort of the pull rod that rotational positioning mechanism received is unanimous, helps improving the holistic stability of device.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic view of a rotary positioning mechanism according to the present invention;
FIG. 3 is a schematic view of A-A in FIG. 1;
FIG. 4 is a schematic view of the tube centering assembly of the present invention;
the reference numerals shown in fig. 1 to 3 are respectively expressed as: 1-supporting mechanism, 2-pull rod assembly, 3-rotary positioning mechanism, 30-support, 31-rotary assembly, 32-driving assembly, 33-centering assembly, 310-baffle plate, 311-fixed shaft, 312-rotary gear, 320-mounting plate, 321-servo motor, 322-speed regulator, 323-main gear, 324-power switch, 330-fixed seat, 331-adjusting block, 332-adjusting rod, 333-clamping block, 334-clamping groove, 10-reserved space, 11-supporting base, 12-supporting frame, 20-fixed plate, 21-pull rod and 4-pipe fitting.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, an automatic spin welding device for a bending pipe includes a supporting mechanism 1, a pull rod assembly 2 disposed on the supporting mechanism 1, and a rotational positioning mechanism 3 disposed between the pull rod assembly 2 and the supporting mechanism 1. The supporting mechanism 1 provides reliable support for the whole device, the rotary positioning mechanism 3 is reliably positioned through the pull rod assembly 2, the pipe fitting is positioned and automatically rotated through the rotary positioning mechanism 3, and a welder can conveniently and reliably weld the pipe fitting.
As shown in fig. 2 to 3, the rotary positioning mechanism 3 includes a support 30 disposed on the support mechanism 1, a rotating assembly 31 rotatably connected to the support 30, a driving assembly 32 disposed on the support mechanism 1 and used for driving the rotating assembly 31 to rotate, and a pipe centering assembly 33 disposed on the rotating assembly 31, and a positioning center of the pipe centering assembly 33 and a center of the rotating assembly 31 are located on the same central axis. The driving assembly 32 provides power for the rotation of the rotating assembly 31, and the tube centering assembly 33 is used for clamping and positioning the tube 4, so as to ensure that the rotating assembly 31 can rotate along with the tube.
The device uses reliably, and the simple operation according to the characteristics of the complicated space bending type of aeroengine, designs specific rotary positioning mechanism 3, fixes the pipeline on rotary positioning mechanism 3 clamping position, realizes the pipe fitting welding of different specifications, and the welder side only treats weld seam and coupling, does not influence the welder operation, and performance is good, and it is effectual to weld. Meanwhile, the pipeline can automatically rotate when the complex space bending type and different-diameter pipelines of the aero-engine are welded through the rotary positioning mechanism 3, the manual argon arc welding is in the flat welding position, the arc starting and stopping times are one time, and the welding effect is effectively improved.
In the welding process, the position of the clamping block 333 in the pipe centering assembly 3 is adjusted according to the diameter of the pipe, so that the bent pipe is stably and reliably clamped on the pipe centering assembly 3, and the installation and the positioning of the bent pipe are completed. Then, the servo motor 321 is started, the driving motor 321 generates kinetic energy to drive the main gear 323 to rotate, the rotating gear 312 is driven to rotate under the rotation of the main gear 323, the pipe centering assembly clamps 3 pipes and rotates along with the rotating gear 312, and then the pipes are welded in a rotating circumferential direction through the welding machine. Meanwhile, according to the actual welding requirements of different pipes, the rotation speed of the servo motor 321 is adjusted by the speed regulator 322 to further control the rotation speeds of the main gear 323 and the rotary gear 312, so that the actual welding conditions are better met.
The rotating assembly 31 comprises a baffle plate 310 arranged on the support 30, a fixed shaft 311 arranged on the baffle plate 310 and a rotating gear 312 connected to the fixed shaft 311 through a bearing, the pull rod assembly 2 is connected between the baffle plate 310 and the support mechanism 1, the pipe centering assembly 33 is arranged on the rotating gear 312, the positioning center of the pipe centering assembly 33 and the center of the rotating gear 312 are located on the same central axis, and the rotating gear 312 is connected with the driving assembly 32 in a matching manner. The baffle 310 provides a reliable fixed support for the rotary gear 312, and facilitates the relative rotation between the rotary gear 312 and the fixed shaft 311 through a bearing, so that the rotation is smooth. The rotary gear 312 is rotated under the driving action of the driving component 32, and then drives the pipe centering component 33 to rotate, so that the pipe clamped on the pipe centering component 33 can be automatically rotated, and the welding performance of the pipe can be effectively improved.
The driving assembly 32 includes a mounting plate 320 disposed on the supporting mechanism 1, a servo motor 321 disposed on the mounting plate 320, a speed governor 322 communicatively connected to the servo motor 321, and a main gear 323 disposed on an output shaft of the servo motor 321, wherein the main gear 323 is engaged with the rotating gear 312, and a power switch 324 for controlling the start and stop of the servo motor 321 and the speed governor 322 is disposed on the mounting plate 320. The mounting plate 320 provides reliable support for the servo motor 321 and reduces the effect of vibration generated during the operation of the servo motor 321 on the welding performance. Stepless speed regulation is realized by matching the servo motor 321 with the speed regulator 322, so that the rotating speed of the main gear 323 is controlled, the rotating speed of the rotating gear 312 is regulated under the speed control of the main gear 323, and the welding reliability and the welding effect when different pipes are welded in actual processing are ensured by regulating the speed.
As shown in fig. 4, the pipe centering assembly 33 includes a fixing base 330 disposed on the supporting mechanism 1 and symmetric with respect to the center of the rotating gear 312, an adjusting block 331 disposed on the fixing base 330, an adjusting rod 332 coupled in the adjusting block 331 and moving along the axial direction of the adjusting block 331, and a clamping block 333 disposed at an end of the adjusting rod 332, wherein a clamping groove 334 for clamping the pipe is disposed on the clamping block 333, and the clamping block 333 is disposed at an end of the adjusting rod 332 close to the center of the rotating gear 312. Fixing base 330 provides reliable fixed stay for centering assembly, adjusts pole 332 and as adjusting the driving piece, drives grip block 333 and moves under this effect of adjusting pole 332, and then adjusts the distance between two grip block 333, satisfies the centre gripping needs of different diameter pipe fittings, and it is spacing to the circumference of pipe fitting through centre gripping groove 334, improves the centre gripping location reliability to the pipe fitting, and then avoids because the centre gripping is unreliable to produce the welding effect that the slippage caused poor.
The outer wall of the adjusting rod 332 is provided with spiral teeth, and a spiral groove matched with the spiral teeth is formed in the adjusting block 331. Through helical tooth and helicla flute cooperation, realize adjusting the removal of pole 332 in regulating block 331, only need adjust pole 332 through clockwise or anticlockwise rotation and can realize displacement regulation, the simple operation, reliable and stable, and its helical tooth has self-locking performance with the helicla flute cooperation, guarantees the reliable centre gripping location to the pipe fitting, avoids the slippage in the rotation welding process.
The size of the clamping groove 334 is matched with the outer diameter of the pipe fitting, and the clamping groove 334 is of a V-shaped structure. Through V type structure, further carry out circumference location to the pipe fitting, improve the location effect.
The supporting mechanism 1 comprises a supporting base 11 with a reserved space 10 and a supporting frame 12 arranged at the top end of the supporting base 11, the pull rod assembly 2 is connected between the supporting frame 12 and the baffle plate 310, and the mounting plate 320 is arranged on the supporting base 11. The device is reliably supported through the supporting base 11, the supporting frame 12 provides stable support for fixing the pull rod assembly 2, and the reserved space 10 is arranged, so that interference of other objects is avoided when the residual complex bent part in the pipeline rotates in the welding process, and the device is reliable and stable.
The pull rod assembly 2 comprises fixing pieces 20 respectively arranged at the top end of the support frame 12 and the baffle plate 310 and a pull rod 21 hinged between the two fixing pieces 20. The fixing pieces 20 are hinged at two ends of the pull rod 21, and the fixing angle of the pull rod 21 can be adjusted conveniently through the hinged structure, so that the position of the rotary positioning mechanism 3 is adjusted, and the welding operation of pipe fittings is facilitated.
The lever assembly 2 is two and is disposed in a central symmetry with respect to the rotary gear 312. Through the symmetrical arrangement of the positions, the acting force of the pull rod 21 on the rotary positioning mechanism 3 is consistent, and the improvement of the overall stability of the device is facilitated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The automatic rotary welding device for the bent pipe fittings is characterized by comprising a supporting mechanism (1), a pull rod assembly (2) arranged on the supporting mechanism (1) and a rotary positioning mechanism (3) arranged between the pull rod assembly (2) and the supporting mechanism (1);
the rotary positioning mechanism (3) comprises a support (30) arranged on the supporting mechanism (1), a rotary component (31) rotationally connected to the support (30), a driving component (32) arranged on the supporting mechanism (1) and used for driving the rotary component (31) to rotate, and a pipe fitting centering component (33) arranged on the rotary component (31), and the positioning center of the pipe fitting centering component (33) and the center of the rotary component (31) are located on the same central axis;
the rotating assembly (31) comprises a baffle plate (310) arranged on the support (30), a fixed shaft (311) arranged on the baffle plate (310) and a rotating gear (312) connected to the fixed shaft (311) through a bearing, the pull rod assembly (2) is connected between the baffle plate (310) and the supporting mechanism (1), the pipe fitting centering assembly (33) is arranged on the rotating gear (312), the positioning center of the pipe fitting centering assembly (33) and the center of the rotating gear (312) are located on the same central axis, and the rotating gear (312) is in matched connection with the driving assembly (32);
the supporting mechanism (1) comprises a supporting base (11) with a reserved space (10) and a supporting frame (12) arranged at the top end of the supporting base (11), and the pull rod assembly (2) is connected between the supporting frame (12) and the baffle plate (310);
the pull rod assembly (2) comprises fixing pieces (20) respectively arranged at the top end of the support frame (12) and the baffle plate (310) and a pull rod (21) hinged between the two fixing pieces (20);
the pipe fitting centering assembly (33) comprises fixed seats (330) which are respectively arranged on the supporting mechanism (1) and are centrosymmetric relative to the rotating gear (312), adjusting blocks (331) arranged on the fixed seats (330), adjusting rods (332) which are connected in the adjusting blocks (331) in a matching mode and move axially along the adjusting blocks (331), and clamping blocks (333) arranged at the ends of the adjusting rods (332), wherein clamping grooves (334) used for clamping pipe fittings are formed in the clamping blocks (333), and the clamping blocks (333) are arranged at the ends, close to the center of the rotating gear (312), of the adjusting rods (332);
the outer wall of the adjusting rod (332) is provided with spiral teeth, and spiral grooves matched with the spiral teeth are formed in the adjusting block (331).
2. The automatic rotary welding device for the bent pipes according to claim 1, wherein the driving assembly (32) comprises a mounting plate (320) arranged on the supporting mechanism (1), a servo motor (321) arranged on the mounting plate (320), a speed governor (322) in communication connection with the servo motor (321), and a main gear (323) arranged on an output shaft of the servo motor (321), the main gear (323) is meshed with the rotating gear (312), and a power switch (324) for controlling the start and stop of the servo motor (321) and the speed governor (322) is arranged on the mounting plate (320).
3. Automatic spin welding device for curved tubes according to claim 1, characterized in that said clamping groove (334) has a V-shaped configuration.
4. Automatic spin welding apparatus for curved tubes according to any of claims 1 to 3, characterized in that the clamping groove (334) is sized to fit the outer diameter of the tube.
5. The automatic spin welding device for curved pipes according to claim 4, characterized in that said tie rod assembly (2) is two and is arranged with central symmetry with respect to said rotary gear (312).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010362505.8A CN111451601B (en) | 2020-04-30 | 2020-04-30 | Automatic rotary welding device for bending type pipe fittings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010362505.8A CN111451601B (en) | 2020-04-30 | 2020-04-30 | Automatic rotary welding device for bending type pipe fittings |
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| Publication Number | Publication Date |
|---|---|
| CN111451601A CN111451601A (en) | 2020-07-28 |
| CN111451601B true CN111451601B (en) | 2022-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010362505.8A Active CN111451601B (en) | 2020-04-30 | 2020-04-30 | Automatic rotary welding device for bending type pipe fittings |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080001821A (en) * | 2006-06-30 | 2008-01-04 | 현대중공업 주식회사 | Plasma automatic welding machine for pipe circle welding |
| CN204381754U (en) * | 2014-12-19 | 2015-06-10 | 重庆拓展自动化仪表有限公司 | A kind of clipping welding tooling |
| CN204621464U (en) * | 2015-05-07 | 2015-09-09 | 盐山县盛基管件制造有限公司 | Pump elbow pipe welding machine |
| CN206169474U (en) * | 2016-09-30 | 2017-05-17 | 山东省计算中心（国家超级计算济南中心） | Steel pipe cutting two -way synchronization rotary clamping device |
| CN207205712U (en) * | 2017-09-07 | 2018-04-10 | 天津航天新锐科技有限公司 | Metal tube supporting device for welding |
-
2020
- 2020-04-30 CN CN202010362505.8A patent/CN111451601B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080001821A (en) * | 2006-06-30 | 2008-01-04 | 현대중공업 주식회사 | Plasma automatic welding machine for pipe circle welding |
| CN204381754U (en) * | 2014-12-19 | 2015-06-10 | 重庆拓展自动化仪表有限公司 | A kind of clipping welding tooling |
| CN204621464U (en) * | 2015-05-07 | 2015-09-09 | 盐山县盛基管件制造有限公司 | Pump elbow pipe welding machine |
| CN206169474U (en) * | 2016-09-30 | 2017-05-17 | 山东省计算中心（国家超级计算济南中心） | Steel pipe cutting two -way synchronization rotary clamping device |
| CN207205712U (en) * | 2017-09-07 | 2018-04-10 | 天津航天新锐科技有限公司 | Metal tube supporting device for welding |
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| Publication number | Publication date |
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| CN111451601A (en) | 2020-07-28 |
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