CN113843475A - Semi-automatic hole forming device and hole forming process for prefabricated wall plate of storage tank - Google Patents
Semi-automatic hole forming device and hole forming process for prefabricated wall plate of storage tank Download PDFInfo
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- CN113843475A CN113843475A CN202111180360.0A CN202111180360A CN113843475A CN 113843475 A CN113843475 A CN 113843475A CN 202111180360 A CN202111180360 A CN 202111180360A CN 113843475 A CN113843475 A CN 113843475A
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- 238000003860 storage Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005520 cutting process Methods 0.000 claims abstract description 86
- 230000002093 peripheral effect Effects 0.000 claims abstract description 21
- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 4
- 239000010959 steel Substances 0.000 claims abstract description 4
- 238000010079 rubber tapping Methods 0.000 claims description 17
- 238000003466 welding Methods 0.000 claims description 15
- 238000010276 construction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000009659 non-destructive testing Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000004040 coloring Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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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
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
-
- 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
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
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- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a semi-automatic hole forming device and a hole forming process for a prefabricated wall plate of a storage tank, wherein the hole forming device comprises a central supporting tube, a case, a guide wheel, a plurality of magnetic wheels, an oxyacetylene belt, a cutting nozzle head and an adjusting mechanism, the central supporting tube is a cylindrical steel tube, a control panel is installed on the case, a motor is installed in the case, the guide wheel is installed at the upper end of the central supporting tube, a wheel shaft of the guide wheel is connected with the case, the magnetic wheels are installed on the case, wheel surfaces of the magnetic wheels are respectively contacted with the outer peripheral wall of the central supporting tube, the magnetic wheels are driven by the motor, one end of the oxyacetylene belt is connected with the control panel through a valve, the cutting nozzle head is installed at the other end of the oxyacetylene belt, and the cutting nozzle head is connected with the adjusting mechanism. The semi-automatic hole opening device and the hole opening process have the advantages of high hole opening efficiency, good hole opening quality, cost saving, convenience and flexibility in use, and are particularly suitable for cutting and opening circular holes with grooves and the diameters of 300-1000 mm on arc-shaped prefabricated wallboards of storage tanks.
Description
Technical Field
The invention relates to a tapping device and a tapping process, in particular to a semi-automatic tapping device and a tapping process for a prefabricated wall plate of a storage tank.
Background
The large storage tank is an indispensable important facility for petrochemical devices and oil product storage bases. The construction process of the storage tank mainly adopts the processes of prefabricating, mounting and separating, and the arc-shaped wall plate of the storage tank needs to be perforated and the storage tank connecting pipe needs to be welded in the prefabricating stage. At 50000m3And the storage tank is taken as an example, the thickness of the arc-shaped wall plate of the general opening is more than 30mm, the aperture of the opening is about 200-700 mm, and the number of the openings of a single tank is 10-20. According to the technical requirements of conventional design, the requirement on the quality of the opening is high, firstly, the groove angle needs to be accurate so as to meet the requirement of a subsequent fillet weld welding process, the welding filling amount is increased due to too large groove angle, the welding deformation of the wall plate exceeds the standard, the welding operation is inconvenient due to too small groove angle, and the welding defect is easily generated in the welding seam; and secondly, the quality requirement of the cut surface of the groove is high, the surface of the groove is required to be smooth, have no notch and no burr, and the surface coloring inspection can be met, otherwise, certain repair welding and repairing cost is invested. It can be seen that the quality of the opening of the wall plate of the storage tank is an important component of the quality of the subsequent installation of the storage tank.
The conventional magnetic pipeline cutting machine can only perform concentric axial cutting at a horizontal position generally, and cannot realize different axial cutting. The storage tank wall plate is difficult to realize the cutting and the opening of a large-scale numerical control cutting machine on a flat plate mould tool in a rolling arc state, and mainly has the defects of large uncertainty of the mould size (radian), large operation difficulty and high cost.
The conventional process flow adopted by the existing domestic storage tank wallboard tapping construction is as follows: technical bottom-intersecting → marking → manual flame cutting and perforating → grinding, repair welding and detection. The disadvantages of this type of perforation are: 1) the hole is opened by manual operation, the labor intensity of the operation is high, and the construction efficiency is low; 2) the manual hole opening quality is not ideal, the precision of the cut groove angle is low, the surface forming quality is poor, and the aspects of aperture uniformity, groove angle, the smoothness of the groove surface and the like are difficult to meet the subsequent welding requirement at one time; 3) after manual hole opening, the workload of polishing, repair welding, repair and nondestructive testing is large, and a certain cost input needs to be increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing a semi-automatic hole forming device and a hole forming process for a prefabricated wall plate of a storage tank, which have the advantages of high hole forming efficiency, good hole forming quality, cost saving, convenience in use and flexibility, aiming at the defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a semi-automatic hole forming device for prefabricated wall plates of a storage tank comprises a central supporting tube, a case, a guide wheel, a plurality of magnetic wheels, an oxyacetylene belt, a cutting nozzle head and an adjusting mechanism, wherein the central supporting tube is a cylindrical steel tube, a control panel is installed on the case, a motor is installed in the case, the guide wheel is installed at the upper end of the central supporting tube, a wheel shaft of the guide wheel is connected with the case, the guide wheel can roll along the circumferential direction of the upper end of the central supporting tube, the magnetic wheels are installed on the case, wheel surfaces of the magnetic wheels are respectively in contact with the circumferential wall of the central supporting tube, the magnetic wheels are driven by the motor and can be adsorbed on the circumferential wall of the central supporting tube and roll along the circumferential direction of the circumferential wall of the central supporting tube, one end of the oxyacetylene belt is connected with the control panel through a valve, the cutting tip is installed at the other end of the oxyacetylene belt, the cutting tip is connected with the adjusting mechanism, and the adjusting mechanism is used for adjusting the position of the cutting tip.
The semi-automatic hole-forming device for the prefabricated wall plate of the storage tank takes the plurality of magnetic wheels driven by the motor as driving wheels and takes the guide wheels as driven wheels, so that the case can automatically travel along the outer peripheral wall of the central supporting tube and the cutting tip can automatically cut holes according to a preset cutting track, and the semi-automatic hole-forming device is particularly suitable for cutting and forming circular holes with grooves and the diameters of 300-1000 mm on the arc-shaped prefabricated wall plate of the storage tank.
The semi-automatic hole forming device for the prefabricated wall plate of the storage tank is simple in structure and low in cost investment, a hole forming process implemented by the device is convenient, reliable and efficient, semi-automatic cutting and hole forming of the prefabricated wall plate of the storage tank can be achieved, and the aims of high hole forming efficiency, good quality and cost saving are achieved.
Preferably, the adjusting mechanism comprises a horizontal adjusting mechanism, a vertical adjusting mechanism and an angle adjusting mechanism, the horizontal adjusting mechanism comprises a first rack bar, a first guide block and a first control knob, the first rack bar is transversely arranged and connected with the chassis, the first guide block is connected with the first rack bar in a sliding fit manner, the first control knob traverses one side wall of the first guide block, the vertical adjusting mechanism comprises a second rack bar, a second guide block and a second control knob, the second rack bar is vertically arranged and connected with the first guide block, the second guide block is connected with the second rack bar in a sliding fit manner, the second control knob traverses one side wall of the second guide block, and the cutting tip is mounted on the second guide block, the angle adjusting mechanism comprises an angle adjusting knob, and the angle adjusting knob is used for adjusting the inclination angle of the cutting tip. The adjusting mechanism is simple in structure, manual adjustment of the left position, the right position, the height position and the inclination angle of the cutting nozzle head is facilitated, and the quality of a cut round hole and a cut groove of the round hole can meet requirements.
A tapping process implemented by using the semi-automatic tapping device for the storage tank prefabricated wall plate comprises the following steps:
1) firstly, a circumferential line of a cutting hole to be cut is scribed on the arc-shaped prefabricated wall plate, then the central supporting tube is placed on the arc-shaped prefabricated wall plate, the circle center of the lower end of the central supporting tube is overlapped with the circle center of the circumferential line, and the lower end of the central supporting tube is fixed on the arc-shaped prefabricated wall plate in a spot welding manner;
2) according to the diameter size and the bevel angle of the cutting hole to be cut, the left and right positions of the first guide block are horizontally adjusted by adjusting the first control knob, so that the left and right positions of the cutting nozzle head meet the diameter requirement of the cutting hole to be cut; the height position of the second guide block is vertically adjusted by adjusting the second control knob, so that the height position of the cutting tip meets the cutting requirement; adjusting the inclination angle of the cutting tip by adjusting the angle adjusting knob to enable the inclination angle of the cutting tip to meet the requirement of the bevel angle;
3) after the valve is opened, the ignition is carried out and the motor is electrified, the magnetic wheels are respectively adsorbed on the peripheral wall of the central supporting tube and roll along the circumferential direction of the peripheral wall of the central supporting tube, and the guide wheels roll along the circumferential direction of the upper end of the central supporting tube to drive the case to automatically walk along the peripheral wall of the central supporting tube, and meanwhile, the cutting nozzle head automatically cuts and opens holes along the circumferential line;
4) and after the cutting and the opening are finished, closing the valve, and after the power is cut off, dismantling the central supporting pipe from the arc prefabricated wall plate.
Preferably, in the automatic cutting and hole opening process in the step 3), if the cutting track of the cutting tip has deviation, the first control knob and the angle adjusting knob are manually adjusted to correct the deviation in the cutting state.
Compared with the prior art, the semi-automatic hole forming device and the hole forming process have the following advantages:
firstly, the hole opening efficiency is high. The hole opening parameters are set in place at one time, the hole opening can be completed at one time, the hole opening can be repeated for multiple times, the working efficiency is more than 2 times that of a manual hole opening mode, and the hole opening device is particularly suitable for cutting and arranging circular holes with grooves and the diameters of 300-1000 mm on arc-shaped prefabricated wall plates of storage tanks.
And secondly, the hole opening quality is good. The hole is uniform in aperture, the groove angle is accurate, the bevel face is smooth and clean, and the subsequent fillet weld welding process can be effectively met.
And thirdly, the workload of manual polishing, repair welding and nondestructive testing is small, and the cost is saved.
And fourthly, the cutting device is convenient and flexible to use, has good environmental adaptability of cutting and tapping operation, and can realize convenient cutting in workshops, plants and open places.
Drawings
FIG. 1 is an appearance schematic diagram of a semi-automatic hole opening device for prefabricated wall panels of a storage tank in the embodiment.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example 1: a semi-automatic hole forming device for a prefabricated wall plate of a storage tank comprises a central supporting tube 1, a case 2, a guide wheel 3, a plurality of magnetic force wheels 4, an oxyacetylene belt 5, a cutting nozzle head 6 and an adjusting mechanism, wherein the central supporting tube 1 is a cylindrical steel tube, a control panel 21 is installed on the case 2, a motor (not shown in the figure) is installed in the case 2, the guide wheel 3 is installed at the upper end of the central supporting tube 1, a wheel shaft of the guide wheel 3 is connected with the case 2, the guide wheel 3 can roll along the circumferential direction of the upper end of the central supporting tube 1, the magnetic force wheels 4 are installed on the case 2, wheel surfaces of the magnetic force wheels 4 are respectively contacted with the peripheral wall of the central supporting tube 1, the magnetic force wheels 4 are driven by the motor, the magnetic force wheels 4 can be adsorbed on the peripheral wall of the central supporting tube 1 and roll along the circumferential direction of the peripheral wall of the central supporting tube 1, one end of the oxyacetylene belt 5 is connected with the control panel 21 through a valve 51, the cutting tip 6 is arranged at the other end of the oxyacetylene belt 5, the cutting tip 6 is connected with an adjusting mechanism, and the adjusting mechanism is used for adjusting the position of the cutting tip 6.
In embodiment 1, the adjusting mechanism includes a horizontal adjusting mechanism, a vertical adjusting mechanism, and an angle adjusting mechanism, the horizontal adjusting mechanism includes the first rack bar 71, the cutting machine comprises a first guide block 72 and a first control knob 73, wherein the first rack bar 71 is transversely arranged and connected with the machine case 2, the first guide block 72 is connected with the first rack bar 71 in a sliding fit mode, the first control knob 73 transversely penetrates through one side wall of the first guide block 72, the vertical adjusting mechanism comprises a second rack bar 81, a second guide block 82 and a second control knob 83, the second rack bar 81 is vertically arranged and connected with the first guide block 72, the second guide block 82 is connected with the second rack bar 81 in a sliding fit mode, the second control knob 83 transversely penetrates through one side wall of the second guide block 82, the cutting nozzle head 6 is installed on the second guide block 82, the angle adjusting mechanism comprises an angle adjusting knob 9, and the angle adjusting knob 9 is used for adjusting the inclination angle of the cutting nozzle head 6.
Example 2: a tapping process implemented by using the semi-automatic tapping device for the storage tank prefabricated wall panels of embodiment 1 comprises the following steps:
1) firstly, a circumferential line of a cutting hole to be cut is scribed on an arc-shaped prefabricated wall plate of a storage tank, then a central supporting tube 1 is placed on the arc-shaped prefabricated wall plate, the circle center of the lower end of the central supporting tube 1 is overlapped with the circle center of the circumferential line, and the lower end of the central supporting tube 1 is fixed on the arc-shaped prefabricated wall plate in a spot welding manner;
2) according to the diameter size and the bevel angle of the cutting hole to be cut, the left and right positions of the first guide block 72 are horizontally adjusted by adjusting the first control knob 73, so that the left and right positions of the cutting nozzle head 6 meet the diameter requirement of the cutting hole to be cut; the height position of the second guide block 82 is vertically adjusted by adjusting the second control knob 83, so that the height position of the cutting tip 6 meets the cutting requirement; the angle adjusting knob 9 is adjusted to adjust the inclination angle of the cutting tip 6, so that the inclination angle of the cutting tip 6 meets the requirement of the bevel angle;
3) after the valve 51 is opened, ignition is carried out and the motor is electrified, the magnetic wheels 4 are respectively adsorbed on the peripheral wall of the central support tube 1 and roll along the peripheral direction of the peripheral wall of the central support tube 1, the guide wheel 3 rolls along the peripheral direction of the upper end of the central support tube 1, the case 2 is driven to automatically walk along the peripheral wall of the central support tube 1, meanwhile, the cutting nozzle head 6 carries out automatic cutting and hole opening along the peripheral line, and in the automatic cutting and hole opening process, if the cutting track of the cutting nozzle head 6 has deviation, the first control knob 73 and the angle adjusting knob 9 are manually adjusted to carry out deviation correction in the cutting state;
4) after the cutting and the opening are finished, the valve 51 is closed, and after the power is cut off, the central support pipe 1 is detached from the arc-shaped prefabricated wall plate.
In the hole opening process, a plurality of magnetic wheels 4 driven by a motor are used as driving wheels, a guide wheel 3 is used as a driven wheel, automatic walking of a case 2 along the peripheral wall of a central supporting tube 1 and automatic cutting and hole opening of a cutting nozzle head 6 according to a set cutting track are achieved, hole opening efficiency is high, hole opening quality is good, cost is saved, the hole opening machine is convenient and flexible to use, hole opening parameters are set in place at one time, hole opening can be completed at one time and repeated for many times, work efficiency is more than 2 times of a manual hole opening mode, the position of the cutting nozzle head 6 can be adjusted within the range of 300-1000 mm of the circumferential diameter, and the hole opening machine is particularly suitable for cutting and opening circular holes with grooves and the diameter of 300-1000 mm on arc-shaped prefabricated wall plates of storage tanks.
Claims (4)
1. A semi-automatic hole forming device for prefabricated wall plates of a storage tank is characterized by comprising a central supporting tube, a case, a guide wheel, a plurality of magnetic wheels, an oxyacetylene belt, a cutting nozzle head and an adjusting mechanism, wherein the central supporting tube is a cylindrical steel tube, a control panel is installed on the case, a motor is installed in the case, the guide wheel is installed at the upper end of the central supporting tube, a wheel shaft of the guide wheel is connected with the case, the guide wheel can roll along the circumferential direction of the upper end of the central supporting tube, the magnetic wheels are installed on the case, wheel surfaces of the magnetic wheels are respectively in contact with the peripheral wall of the central supporting tube, the magnetic wheels are driven by the motor and can be adsorbed on the peripheral wall of the central supporting tube and roll along the circumferential direction of the peripheral wall of the central supporting tube, one end of the oxyacetylene belt is connected with the control panel through a valve, the cutting tip is installed at the other end of the oxyacetylene belt, the cutting tip is connected with the adjusting mechanism, and the adjusting mechanism is used for adjusting the position of the cutting tip.
2. The semi-automatic tapping device for the storage tank prefabricated wall panel according to claim 1, wherein the adjusting mechanism comprises a horizontal adjusting mechanism, a vertical adjusting mechanism and an angle adjusting mechanism, the horizontal adjusting mechanism comprises a first rack bar, a first guide block and a first control knob, the first rack bar is transversely arranged and connected with the chassis, the first guide block is connected with the first rack bar in a sliding fit manner, the first control knob traverses one side wall of the first guide block, the vertical adjusting mechanism comprises a second rack bar, a second guide block and a second control knob, the second rack bar is vertically arranged and connected with the first guide block, the second guide block is connected with the second rack bar in a sliding fit manner, and the second control knob traverses one side wall of the second guide block, the cutting tip is arranged on the second guide block, the angle adjusting mechanism comprises an angle adjusting knob, and the angle adjusting knob is used for adjusting the inclination angle of the cutting tip.
3. A tapping process implemented by using the semi-automatic tapping device for storage tank prefabricated wall panels of claim 2, wherein the tapping process comprises the following steps:
1) firstly, a circumferential line of a cutting hole to be cut is scribed on an arc-shaped prefabricated wall plate of a storage tank, then a central supporting tube is placed on the arc-shaped prefabricated wall plate, the circle center of the lower end of the central supporting tube is overlapped with the circle center of the circumferential line, and the lower end of the central supporting tube is fixed on the arc-shaped prefabricated wall plate in a spot welding manner;
2) according to the diameter size and the bevel angle of the cutting hole to be cut, the left and right positions of the first guide block are horizontally adjusted by adjusting the first control knob, so that the left and right positions of the cutting nozzle head meet the diameter requirement of the cutting hole to be cut; the height position of the second guide block is vertically adjusted by adjusting the second control knob, so that the height position of the cutting tip meets the cutting requirement; adjusting the inclination angle of the cutting tip by adjusting the angle adjusting knob to enable the inclination angle of the cutting tip to meet the requirement of the bevel angle;
3) after the valve is opened, the ignition is carried out and the motor is electrified, the magnetic wheels are respectively adsorbed on the peripheral wall of the central supporting tube and roll along the circumferential direction of the peripheral wall of the central supporting tube, and the guide wheels roll along the circumferential direction of the upper end of the central supporting tube to drive the case to automatically walk along the peripheral wall of the central supporting tube, and meanwhile, the cutting nozzle head automatically cuts and opens holes along the circumferential line;
4) and after the cutting and the opening are finished, closing the valve, and after the power is cut off, dismantling the central supporting pipe from the arc prefabricated wall plate.
4. The tapping process implemented by using the semi-automatic tapping device for the storage tank prefabricated wall panel of claim 2 according to claim 3, wherein in the automatic cutting and tapping process of step 3), if the cutting track of the cutting nozzle head has a deviation, the deviation is corrected by manually adjusting the first control knob and the angle adjusting knob in the cutting state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111180360.0A CN113843475A (en) | 2021-10-11 | 2021-10-11 | Semi-automatic hole forming device and hole forming process for prefabricated wall plate of storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111180360.0A CN113843475A (en) | 2021-10-11 | 2021-10-11 | Semi-automatic hole forming device and hole forming process for prefabricated wall plate of storage tank |
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| CN113843475A true CN113843475A (en) | 2021-12-28 |
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| CN202111180360.0A Pending CN113843475A (en) | 2021-10-11 | 2021-10-11 | Semi-automatic hole forming device and hole forming process for prefabricated wall plate of storage tank |
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| CN (1) | CN113843475A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115338512A (en) * | 2022-08-02 | 2022-11-15 | 郑州宝冶钢结构有限公司 | Arc plate groove processing device |
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| CN202763252U (en) * | 2012-08-09 | 2013-03-06 | 中国海洋石油总公司 | Cut-off ring plate trackless guide groove cutter device |
| CN203282010U (en) * | 2013-04-25 | 2013-11-13 | 湖北精工钢结构有限公司 | Arc-shaped plate piece groove machining tool |
| CN205464704U (en) * | 2016-01-08 | 2016-08-17 | 江苏海灵重工设备科技有限公司 | Automatic groove device of modified |
| CN109794665A (en) * | 2019-03-19 | 2019-05-24 | 海洋石油工程（青岛）有限公司 | Portable hole-cutting device and cut hole technique |
| CN109940245A (en) * | 2019-04-18 | 2019-06-28 | 河北凯森石化工程有限责任公司 | A kind of circular steel plate cutting stock device |
| CN110722302A (en) * | 2019-09-03 | 2020-01-24 | 海洋石油工程（青岛）有限公司 | Semi-automatic mouth repairing device for large-diameter steel pipe in ocean engineering |
| CN113182641A (en) * | 2021-05-18 | 2021-07-30 | 中国葛洲坝集团第三工程有限公司 | Device for assisting semi-automatic cutting machine in cutting arc-shaped groove and construction method |
-
2021
- 2021-10-11 CN CN202111180360.0A patent/CN113843475A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202763252U (en) * | 2012-08-09 | 2013-03-06 | 中国海洋石油总公司 | Cut-off ring plate trackless guide groove cutter device |
| CN203282010U (en) * | 2013-04-25 | 2013-11-13 | 湖北精工钢结构有限公司 | Arc-shaped plate piece groove machining tool |
| CN205464704U (en) * | 2016-01-08 | 2016-08-17 | 江苏海灵重工设备科技有限公司 | Automatic groove device of modified |
| CN109794665A (en) * | 2019-03-19 | 2019-05-24 | 海洋石油工程（青岛）有限公司 | Portable hole-cutting device and cut hole technique |
| CN109940245A (en) * | 2019-04-18 | 2019-06-28 | 河北凯森石化工程有限责任公司 | A kind of circular steel plate cutting stock device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115338512A (en) * | 2022-08-02 | 2022-11-15 | 郑州宝冶钢结构有限公司 | Arc plate groove processing device |
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Application publication date: 20211228 |