CN116786946A - Girth welding device for net rack rod piece and end fitting - Google Patents
Girth welding device for net rack rod piece and end fitting Download PDFInfo
- Publication number
- CN116786946A CN116786946A CN202311036667.2A CN202311036667A CN116786946A CN 116786946 A CN116786946 A CN 116786946A CN 202311036667 A CN202311036667 A CN 202311036667A CN 116786946 A CN116786946 A CN 116786946A
- Authority
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- China
- Prior art keywords
- conical head
- steel pipe
- bolt
- head
- fixer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000003466 welding Methods 0.000 title claims abstract description 51
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 82
- 239000010959 steel Substances 0.000 claims abstract description 82
- 239000006096 absorbing agent Substances 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 241001417523 Plesiopidae Species 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 238000003754 machining Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0533—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor external pipe alignment clamps
Abstract
The invention relates to the technical field of steel pipe machining devices, in particular to a girth welding device for a net rack rod piece and an end fitting, which comprises a robot arm, a cone head bolt pairing mechanism and a steel pipe girth welding mechanism; the conical head bolt pairing mechanism comprises a pairing base, a sliding track, a bolt absorber, a conical head supporting fixer and a conical head magnetic absorbing fixer, wherein a conical head assembly is formed by a high-strength bolt, a conical head and a sleeve; the welding gun, the conical head buffer fixer and the steel pipe fixed rotator are arranged at two ends of the steel pipe girth welding mechanism, the conical head buffer fixer and the steel pipe fixed rotator at the right end move along the length direction of the supporting base until a gap of 1-3 mm is reserved between the end part of the steel pipe and the large end of the conical head, the welding gun carries out three-point electric welding on the top surface and the two side surfaces of the gap, the steel pipe fixed rotator drives the steel pipe and the conical head assembly to roll, and girth welding of the steel pipe and the conical head is completed; the whole operation process of the invention is controllable, and the complicated operation that the bolt rod part passes through the conical head again in the construction stage is avoided.
Description
Technical Field
The invention relates to the technical field of steel pipe machining devices, in particular to a girth welding device for net rack rod pieces and end fittings.
Background
The steel pipe is rolled, formed, cleaned and welded to the bolt and the conical head to form the rod of the bolt net frame structure. The center of the conical head is provided with a through hole which can allow the thread section of the bolt to extend out. When the screw is installed, the long hexagonal sleeve is sleeved on the threaded section of the bolt extending out of the conical head, the bolt is connected with the long hexagonal sleeve through the pin or the fastening screw, the long hexagonal sleeve is directly screwed, the bolt is driven to rotate through the pin or the fastening screw, and therefore the bolt is screwed into the ball body until the bolt head of the bolt is tightly attached to the inner side face of the sealing plate or the conical head, and then the installation is completed.
Chinese patent CN 110480295a discloses an automatic bolt inserting unit of an automatic welding production system for rack connecting rods, wherein the bolt is inserted into the end of a steel pipe through an automatic bolt inserting electric control device, and then the welding work of the steel pipe and the conical head is completed through a sealing plate or a conical head pushing device and an automatic welding unit. However, in the construction of the rod, it is often necessary for a worker to prop up the rod so that the shank of the bolt passes through the circular hole of the bit. The automatic direction of the bolt in the steel pipe can only be guaranteed by the automatic electric control device, but the real-time angle between the bolt rod and the center line of the steel pipe cannot be controlled, so that a worker needs to try many times after supporting the rod body, the rod part of the bolt can penetrate through the round hole of the conical head, then the bolt and the conical head at the other end of the steel pipe are operated again, the number of times of the try is uncontrollable, and the operation is complex.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the girth welding device for the net rack rod piece and the end fitting, which ensures that the bolt is stably connected with the conical head before the conical head and steel pipe welding process, ensures the relative state of the bolt and the conical head, ensures that the end part of the bolt faces towards the steel pipe after the conical head and the steel pipe are welded, ensures that the rod part of the bolt penetrates out of the conical head, has controllable whole operation process, and avoids the complicated operation of penetrating out the conical head from the rod part of the bolt again in the construction stage.
A girth welding device for net rack rod pieces and end fittings comprises a robot arm, a cone head bolt pairing mechanism and a steel pipe girth welding mechanism;
the conical head bolt pairing mechanism comprises a pairing base, a sliding track, a bolt absorber, a conical head supporting fixer and a conical head magnetic attraction fixer, wherein the conical head supporting fixer and the conical head magnetic attraction fixer are used for placing conical heads;
the bolt absorber moves along the sliding track, the rod part of the high-strength bolt is pushed into a round hole penetrating through the small end of the conical head, one robot arm grabs the sleeve, the sleeve is sleeved on the rod part of the high-strength bolt, the penetrating screw hole of the sleeve is aligned with the rectangular groove of the high-strength bolt, the other robot arm grabs the pin, the pin is screwed into the penetrating screw hole of the sleeve in a rotating mode, and the pin is used for connecting the sleeve with the high-strength bolt, and the high-strength bolt, the conical head, the sleeve and the pin form a conical head assembly;
welding gun, conical head buffer fixtures and steel pipe fixed rotators are all installed at the both ends of steel pipe girth welding mechanism, the robot arm places conical head subassembly on conical head buffer fixtures, the steel pipe passes through the roll table and gets into on the fixed rotator of steel pipe, conical head buffer fixtures and the fixed rotator of steel pipe of right-hand member remove along supporting base length direction, leave 1~3mm gap to between the tip of steel pipe and the big head of conical head, general control system sends out the instruction, start welding gun, carry out the three-point electric welding at the top surface in gap earlier, two sides, drive steel pipe and conical head subassembly roll by the fixed rotator of steel pipe again, accomplish the girth welding of steel pipe and conical head.
Further, the bolt absorber absorbs the round head at the end part of the high-strength bolt through the electromagnet.
Further, the bolt absorber is provided with a track which moves up and down and is used for adjusting the height of the high-strength bolt, so that the rod part of the high-strength bolt passes through round holes of small heads of the conical heads with different specifications.
Further, the small head is placed on the cone head supporting and fixing device through the robot arm, and the cone head magnetic attraction fixing device adsorbs the large head of the cone head through the electromagnet.
Further, the steel pipe fixing rotator is provided with a V-shaped clamping groove, and the V-shaped clamping groove is provided with balls along the V-shaped edge.
Further, the conical head buffer fixer adsorbs the sleeve of the conical head assembly through the electromagnet, and after three-point electric welding is completed by the welding gun, the electromagnet of the conical head buffer fixer is powered off and moves downwards, and the steel pipe fixing rotator drives the steel pipe and the conical head assembly to roll.
By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that:
the high-strength bolt, the conical head, the sleeve and the pin form the conical head assembly through the conical head bolt pairing mechanism, the bolt is stably connected with the conical head before the conical head and steel pipe welding procedure, the relative state of the bolt and the conical head is guaranteed, after the conical head and the steel pipe are welded, the end part of the bolt faces the steel pipe, the rod part of the bolt penetrates out of the conical head, the whole operation process is controllable, and the complicated operation that the rod part of the bolt penetrates out of the conical head again in the construction stage is avoided;
before the rod piece consisting of the steel pipe, the conical head and the high-strength bolt is connected with the bolt ball, the sleeve and the pin can be detached, the detached sleeve and pin can be recycled, and the construction operation is simplified and the waste of materials is avoided;
firstly, carrying out three-point electric welding on the top surface and the two side surfaces of a gap between the end part of the steel pipe and the conical head, and then rotating the steel pipe and the conical head assembly to finish ring welding, wherein the welding process is stable and reliable, and the welding gun is prevented from moving greatly;
the bolt suction device is provided with a track which moves up and down, so that the high-strength bolt can move up and down, the high-strength bolt can adapt to the conical heads and the high-strength bolts with different specifications, and the high-strength bolt can be always inserted into the round hole of the small head of the conical head in the installation stage of the conical head assembly;
the conical head buffer fixer and the steel pipe fixed rotator at the left end of the support base are in a fixed state, and the conical head buffer fixer and the steel pipe fixed rotator at the right end can move along the length direction of the support base and can adapt to steel pipes with different lengths.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the structure of a taper head bolt to be assembled;
FIG. 3 is a schematic view of the structure of a cone head bolt being assembled;
FIG. 4 is a schematic view of the construction of the mounting sleeve;
FIG. 5 is a schematic view of the assembled taper head bolt;
FIG. 6 is a schematic side view of a sleeve
FIG. 7 is a schematic view of the front structure of the sleeve
FIG. 8 is a schematic view of the pin construction;
FIG. 9 is a schematic view of the transfer of the bit assembly to the bit buffer fixture;
FIG. 10 is a schematic view of the roller table;
FIG. 11 is a schematic view of the structure of a steel pipe fixing rotator;
reference numeral, 1-robot arm, 2-support base, 3-welder, 4-roller bed, 5-mating base, 6-sliding rail, 7-bolt aspirator, 8-high strength bolt, 9-conical head, 10-conical head support fixer, 11-conical head magnetic attraction fixer, 12-sleeve, 13-pin, 14-steel tube, 15-conical head buffer fixer, 16-steel tube fixing rotator, 17-ball.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is evident that the embodiments described are only some embodiments of the present invention, but not all embodiments. Other embodiments, or equivalents, which are apparent to those skilled in the art based on the examples provided herein, are intended to be within the scope of the invention.
Referring to fig. 1-11, the invention provides a girth welding device for a net rack rod piece and an end fitting, which comprises a taper head bolt pairing mechanism and a steel pipe girth welding mechanism, wherein the taper head bolt pairing mechanism comprises a pairing base 5, a sliding track 6, a bolt suction device 7, a taper head supporting fixer 10 and a taper head magnetic suction fixer 11, the sliding track 6, the taper head supporting fixer 10 and the taper head magnetic suction fixer 11 are all arranged on the pairing base 5, the bolt suction device 7 moves along the sliding track 6 through a zigzag track, under the instruction of a general control system, the bolt suction device 7 adsorbs the round head of the end part of a high-strength bolt 8 through an electromagnet, the high-strength bolt 8 is placed in a material frame, the bolt suction device 7 is provided with a track which moves up and down, so that the high-strength bolt 8 can move up and down to adapt to taper heads 9 and bolts 8 with different specifications, and round holes of small heads of the taper heads 9 can be inserted into the high-strength bolt 8 all the time;
the conical head 9 is placed on the conical head supporting and fixing device 10 and the conical head magnetic attraction and fixing device 11 through the robot arm 1, and the small head of the conical head 9 is placed on the conical head supporting and fixing device 10, so that the conical head 9 is prevented from falling down, the conical head magnetic attraction and fixing device 11 is used for fixing the conical head 9 through an electromagnet, and the conical head 9 is stabilized through adsorption when the electric power is applied;
the bolt absorber 7 absorbs the high-strength bolt 8 grabbed by the robot arm 1, moves along the sliding track 6, pushes the high-strength bolt 8 into and passes through a round hole of the small head of the conical head 9, the robot arm 1 grabs the sleeve 12 and ensures that a round screw hole on the side surface of the sleeve 12 is aligned with a rectangular groove of the high-strength bolt 8, the other robot arm 1 grabs the pin 13 and rotates the pin 13 into the round hole of the sleeve 12, so that the high-strength bolt 8 is matched with the conical head 9, and the high-strength bolt 8, the conical head 9, the sleeve 12 and the pin 13 form a conical head assembly;
when the magnetic attraction fixing device 11 of the conical head is powered off, the adsorption to the conical head 9 is released, the conical head 9 can be transferred, and the conical head assembly can be transferred to the steel pipe girth welding mechanism through the robot arm 1;
the steel pipe girth welding mechanism is characterized in that two ends of the supporting base 2 are respectively provided with a conical head buffer fixer 15 and a steel pipe fixing rotator 16, the conical head buffer fixer 15 and the steel pipe fixing rotator 16 at the left end are fixed, the conical head buffer fixer 15 and the steel pipe fixing rotator 16 at the right end can move along the length direction of the supporting base 2 so as to adapt to steel pipes 14 with different lengths, the steel pipe fixing rotator 16 is provided with a V-shaped clamping groove, and the V-shaped clamping groove is provided with a ball 17 along the V-shaped edge;
the robot arm 1 places the conical head assembly on the conical head buffer fixer 15, meanwhile, the steel pipe 14 enters the steel pipe fixing rotator 16 through the roller way 4, the conical head buffer fixer 15 and the steel pipe fixing rotator 16 at the right end move on the supporting base 2, so that the conical head assemblies at the two ends are close to the steel pipe 14, a gap of 1-3 mm is reserved between the large end of the conical head 9 and the end part of the steel pipe 14, the robot arm 1 drives the welding gun 3 to align with the gap between the conical head 9 and the steel pipe 14, the general control system sends out an instruction, the welding gun 3 is started, three-point electric welding is carried out on the top surface and the two side surfaces, then the steel pipe fixing rotator 16 drives the steel pipe 14 and the conical head assembly to roll through the rotation of the ball 17, the circular welding of the steel pipe 14 and the conical head 9 is realized, and the circular welding number is determined according to the diameter, the wall thickness, welding process parameters and the like of the steel pipe 14.
The material of the conical head 9 is 45# steel, and the robot arm 1 for sucking the conical head 9 is provided with a visual recognition system, and the visual recognition system is characterized by the diameters of a big head and a small head of the conical head 9 and the diameter of a round hole in the middle of the small head. The robot arm 1 grabs the big head of the cone 9 and places the big head on the cone support fixing device 10 and the cone magnetic suction fixing device 11, the cone magnetic suction fixing device 11 sucks the cone 9, the robot arm 1 releases the suction of the cone 9, after the cone assembly is installed, the robot arm 1 grabs the big head of the cone 9 again and transfers the big head to the cone buffer fixing device 15, the cone buffer fixing device 15 sucks the sleeve 12 of the cone assembly, and the robot arm 1 releases the suction of the cone 9.
The end of the high-strength bolt 8 is round-head-shaped, a rectangular groove is carved near the round head, the rectangular groove is provided with a round corner, the rectangular groove is used for fixing the pin 13, the outer part of the sleeve 12 is hexagonal, the inner part is a round hole for sleeving the rod part of the high-strength bolt 8, a round screw hole penetrating through the thickness is formed in the side surface of the sleeve 12, the aperture and the threads correspond to the threads on the pin 13, positive and negative threads are formed, and the matching is firm.
During construction, the sleeve 12 and the pin 13 which are disassembled can be recycled before the rod piece consisting of the steel pipe 14, the conical head 9 and the high-strength bolt 8 is connected with the bolt ball.
The operation flow of the invention is as follows: a) Placing a conical head: the robot arm 1 grabs the big head of the conical head 9 and is placed on the conical head supporting fixer 10 and the conical head magnetic attraction fixer 11, the conical head 9 is attracted by the conical head magnetic attraction fixer 11, and the robot arm 1 releases the attraction of the conical head 9; b) And (3) mounting of a cone head assembly: the high-strength bolt 8 is pushed into and passes through a round hole of the small end of the conical head 9 by the bolt absorber 7, the sleeve 12 is grabbed by the robot arm 1 and sleeved on the rod part of the high-strength bolt 8, and the pin 13 is grabbed by the other robot arm 1 and is screwed into a round screw hole of the sleeve 12 in a rotating manner; c) Transfer fixation of the cone head assembly: the robot arm 1 grabs the big head of the conical head 9 again and transfers the big head to the conical head buffer fixing device 15, the conical head buffer fixing device 15 adsorbs the sleeve 12 of the conical head assembly, and the robot arm 1 releases the adsorption of the conical head 9; d) Distance adjustment of the steel pipe and the conical head: the conical head buffer fixer 15 and the steel tube fixing rotator 16 at the right end move on the support base 2 to enable conical head assemblies at the two ends to be close to the steel tube 14 until a gap of 1-3 mm is reserved between the big head of the conical head 9 and the end part of the steel tube 14; e) Welding: the three-point welding is performed first, and then the steel pipe 14 and the cone head assembly are rotated to finish the girth welding.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (6)
1. The girth welding device for the net rack rod piece and the end fitting is characterized by comprising a robot arm (1), a cone head bolt pairing mechanism and a steel pipe girth welding mechanism,
the conical head bolt pairing mechanism comprises a pairing base (5), a sliding track (6), a bolt absorber (7), a conical head supporting fixer (10) and a conical head magnetic attraction fixer (11), wherein the conical head supporting fixer (10) and the conical head magnetic attraction fixer (11) are used for placing a conical head (9), the bolt absorber (7) is used for absorbing round heads at the end parts of high-strength bolts (8), and the high-strength bolts (8) are provided with rectangular grooves;
the bolt absorber (7) moves along the sliding track (6), the rod part of the high-strength bolt (8) is pushed into a round hole penetrating through the small end of the conical head (9), one robot arm (1) grabs the sleeve (12) to enable the sleeve (12) to sleeve the rod part of the high-strength bolt (8), the penetrating screw hole of the sleeve (12) is aligned with the rectangular groove of the high-strength bolt (8), the other robot arm (1) grabs the pin (13), the pin (13) is screwed into the penetrating screw hole of the sleeve (12) in a rotating mode, and the pin (13) is used for connecting the sleeve (12) with the high-strength bolt (8), and the high-strength bolt (8), the conical head (9), the sleeve (12) and the pin (13) form a conical head assembly;
welding gun (3), conical head buffer fixing device (15) and steel pipe fixed rotator (16) are all installed at the both ends of steel pipe girth welding mechanism, robot arm (1) places conical head subassembly on conical head buffer fixing device (15), steel pipe (14) get into on steel pipe fixed rotator (16) through roll table (4), conical head buffer fixing device (15) and steel pipe fixed rotator (16) of right-hand member remove along supporting base (2) length direction, leave 1~3mm gap between the tip of steel pipe (14) and the big head of conical head (9), general accuse system sends out the instruction, start welding gun (3), top surface, both sides face at the gap carry out three-point electric welding earlier, drive steel pipe (14) and conical head subassembly roll by steel pipe fixed rotator (16) again, accomplish the girth welding of steel pipe (14) and conical head (9).
2. The girt assembly of claim 1, wherein: the bolt absorber (7) absorbs the round head at the end part of the high-strength bolt (8) through an electromagnet.
3. The girt assembly of claim 1, wherein: the bolt absorber (7) is provided with a track which moves up and down and is used for adjusting the height of the high-strength bolt (8) so that the rod part of the high-strength bolt (8) passes through round holes of small heads of the conical heads (9) with different specifications.
4. The girt assembly of claim 1, wherein: the small head of the cone head (9) is placed on the cone head supporting and fixing device (10) through the robot arm (1), and the large head of the cone head (9) is attracted by the cone head magnetic attraction fixing device (11) through the electromagnet.
5. The girt assembly of claim 1, wherein: the steel tube fixing rotator (16) is provided with a V-shaped clamping groove, and the V-shaped clamping groove is provided with balls (17) along the V-shaped edge.
6. The girt assembly of claim 1, wherein: after three-point electric welding is completed by the welding gun (3), the electromagnet of the conical head buffer fixer (15) is powered off and moves downwards, and the steel pipe fixing rotator (16) drives the steel pipe (14) and the conical head assembly to roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311036667.2A CN116786946B (en) | 2023-08-17 | 2023-08-17 | Girth welding device for net rack rod piece and end fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311036667.2A CN116786946B (en) | 2023-08-17 | 2023-08-17 | Girth welding device for net rack rod piece and end fitting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116786946A true CN116786946A (en) | 2023-09-22 |
| CN116786946B CN116786946B (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311036667.2A Active CN116786946B (en) | 2023-08-17 | 2023-08-17 | Girth welding device for net rack rod piece and end fitting |
Country Status (1)
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|---|---|
| CN (1) | CN116786946B (en) |
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| US20190247962A1 (en) * | 2018-02-09 | 2019-08-15 | Conxtech, Inc. | Methods and apparatus for assembly of moment connection components |
| CN110480120A (en) * | 2019-07-31 | 2019-11-22 | 徐州德坤电气科技有限公司 | A kind of control method of rack connecting rod automatic welding production system |
| CN110480123A (en) * | 2019-07-31 | 2019-11-22 | 徐州德坤电气科技有限公司 | A kind of rack connecting rod automatic welding production system |
| CN110480295A (en) * | 2019-07-31 | 2019-11-22 | 徐州德坤电气科技有限公司 | A kind of bolt of rack connecting rod automatic welding production system is placed in unit automatically |
| CN212217402U (en) * | 2020-06-01 | 2020-12-25 | 山东友联工程有限公司 | Net frame conical head positioning machine |
| CN112059393A (en) * | 2020-09-08 | 2020-12-11 | 杭州亦和水电安装工程有限公司 | High-frequency pipe welding machine convenient to clearance |
| WO2022253243A1 (en) * | 2021-05-31 | 2022-12-08 | 中铁工程服务有限公司 | Complete device for repairing and reinforcing shield tunnel segments, and repair and reinforcement process |
| CN216041691U (en) * | 2021-09-22 | 2022-03-15 | 杭州华凌钢结构高强螺栓有限公司 | Ball joint high-strength bolt for steel structure net rack |
| CN218657501U (en) * | 2021-09-27 | 2023-03-21 | Dig自动化工程（武汉）有限公司 | Novel be used for excavator axle bed welded device that shifts |
| CN216263975U (en) * | 2021-11-12 | 2022-04-12 | 重庆合聚达智能装备有限公司 | Articulated arc welding robot |
| CN219045498U (en) * | 2022-10-27 | 2023-05-19 | 江苏中为金属制造有限公司 | Novel grid structure assembly part |
| CN116532985A (en) * | 2023-07-05 | 2023-08-04 | 中建材(合肥)钢构科技有限公司 | Steel pipe end part and conical head connection pairing device with conical head marking function |
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