CN113909804A - Construction method for manufacturing pressure steel pipe stiffening ring - Google Patents
Construction method for manufacturing pressure steel pipe stiffening ring Download PDFInfo
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- CN113909804A CN113909804A CN202111078153.4A CN202111078153A CN113909804A CN 113909804 A CN113909804 A CN 113909804A CN 202111078153 A CN202111078153 A CN 202111078153A CN 113909804 A CN113909804 A CN 113909804A
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- stiffening ring
- steel pipe
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- stiffening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention discloses a construction method for manufacturing a pressure steel pipe stiffening ring, which comprises the following steps: 1) taking a pressure steel pipe, cutting the pressure steel pipe in a straight strip form along the longitudinal axis direction of the pressure steel pipe by using a numerical control cutting machine to form stiffening ring straight strips, wherein the length of each stiffening ring can be divided into segments according to the pipe diameter expansion requirement; 2) and rolling the stiffening ring straight strip by using a forming machine to form the radian of the stiffening ring in a rolling process. The invention greatly reduces the loss rate of the steel plate, reduces the number of splicing welding seams and saves a large amount of construction cost.
Description
Technical Field
The invention belongs to the technical field of manufacturing of steel structures such as a pressure steel pipe and the like, and relates to a construction method for manufacturing a stiffening ring of the pressure steel pipe.
Background
The pressure steel pipe is an important component of a water delivery building in the development and construction of hydropower stations at home and abroad, and is mainly in a form of matching a main pipe of the pressure steel pipe with a stiffening ring. The pressure steel pipe has higher strength and sealing performance, can effectively bear internal water pressure, and properly adds the stiffening ring outside the pipe under the condition of not increasing the wall thickness of the main pipe, wherein the stiffening ring is used as an annular reinforcing structure welded on the outer wall of the steel pipe. Can effectively improve the external pressure resistance stability of the pressure steel pipe and has high economical efficiency.
With the wide application of the pressure steel pipe, the amount of manufacturing and installing work of the pressure steel pipe is increasing, and the conventional mode of manufacturing the pressure steel pipe by using a flame cutting stiffening ring construction method cannot adapt to the current construction situation of high cost and short construction period, so that how to efficiently manufacture and install the pressure steel pipe is a subject of research and study of each construction unit. In addition, the construction in the link still cannot get rid of the problems of high loss rate and high cost of the steel plate, and the construction period and the economic benefit are seriously influenced.
As shown in figure 1, the stiffening ring construction adopts a conventional process flow, lofting and blanking are performed according to the outer arc degree of a steel pipe, the steel pipe is cut in blocks, the large-diameter pressure steel pipe is generally divided into 6-12 sections, the steel pipe is assembled in a vertical posture along the axis of the steel pipe, and butt weld joints are increased due to more sections of the stiffening ring after the assembly is completed.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
In order to solve the defects of the existing construction method, the invention provides a construction method of a pressure steel pipe stiffening ring, which can replace the traditional construction method of flame cutting stiffening rings, utilizes a numerical control cutting machine to perform straight-bar cutting and blanking and adopts a forming machine to perform rolling.
Therefore, the technical scheme provided by the invention is as follows:
the construction method for manufacturing the pressure steel pipe stiffening ring comprises the following steps:
1) taking a pressure steel pipe, cutting the pressure steel pipe along the longitudinal axis direction of the pressure steel pipe in a straight strip form by using a numerical control cutting machine to form stiffening ring straight strips, wherein the length of each stiffening ring can be divided into segments according to the pipe diameter expansion requirement;
2) and rolling the stiffening ring straight strip by using a forming machine to form the radian of the stiffening ring in a rolling process.
Preferably, in the method for manufacturing and constructing the pressure steel pipe stiffening ring, in step 1), the length of each stiffening ring straight bar is 1/2 of the total length of the required stiffening ring, and 2 stiffening ring straight bars are assembled into a stiffening ring.
Preferably, the method for manufacturing and constructing the pressure steel pipe stiffening ring further comprises the following steps:
and assembling the 2 straight stiffening ring strips into a stiffening ring.
Preferably, the method for manufacturing and constructing a pressure steel pipe stiffening ring further comprises:
the utility model provides a welding auxiliary groove, the standing groove has been seted up along its circumference on the inner wall in welding auxiliary groove for hold stiffening ring vertical bar, welding auxiliary groove semicircular in shape, and its arc length weak point in the arc length of stiffening ring vertical bar, the both ends in welding auxiliary groove have the mount, two along its radial outside extension in welding auxiliary groove the welding auxiliary groove with fixed two the bolt of mount is connected it and is a confined ring shape, wherein, certain space has between mount and the stiffening ring butt joint welding seam, certain space is for allowing welding set to carry out welding operation's space.
Preferably, in the construction method for manufacturing the stiffening ring of the pressure steel pipe, in the step 1), the adopted pressure steel plate is purchased according to the unfolding length of the stiffening ring by fixed length, and the cutting compensation and the pre-bending amount are calculated in a combined manner.
Preferably, in the construction method for manufacturing the stiffening ring of the pressure steel pipe, before the rolling in the step 2), whether the mechanical property of the base metal of the stiffening ring is affected in the rolling process is considered, a process test is performed according to the curvature radius of the pipe diameter before construction, the mechanical property and a metallographic sample are performed, and the process feasibility is determined according to the test result.
Preferably, in the method for manufacturing and constructing the stiffening ring for the pressure steel pipe, in the step 1), in the process of blanking the stiffening ring straight strip, the lengths required by the straight edge quantity existing at the end parts are directly cut at the two end parts of the pre-formed stiffening ring straight strip, namely, the length Lo of the end part with radian of blanking is more than or equal to 500mm, and the radian of a cutting arc is determined by the curvature radius of the steel pipe.
Preferably, in the construction method for manufacturing the pressure steel pipe stiffening ring, the numerical control cutting machine adopts a numerical control rotary three-cutting-torch cutting machine.
Preferably, the method for manufacturing and constructing the pressure steel pipe stiffening ring further comprises the following steps:
punching holes on two sides of the straight bar of the stiffening ring to form fixing holes, wherein the fixing holes are positioned at two ends of the stiffening ring after being rolled;
when the stiffening rings are assembled, reinforcing ribs are arranged between two adjacent stiffening rings, and two ends of each reinforcing rib are fixed in the fixing holes at one end of each of the two adjacent stiffening rings.
The invention at least comprises the following beneficial effects:
1. the invention has high automation level and high efficiency, fully utilizes automatic and intelligent equipment for construction, can greatly reduce the labor input, reduce the labor intensity and the production cost, and improve the manufacturing quality and the production efficiency of the pressure steel pipe.
2. The invention has wide application range and is suitable for manufacturing stiffening rings at different positions of pressure steel pipes with various pipe diameters.
3. The construction method is high in expansibility, and not only is suitable for manufacturing the pressure steel pipe stiffening ring, but also is suitable for constructing metal structure annular parts such as a pressure steel pipe thrust ring, a water blocking ring, a flange and the like.
4. The invention greatly reduces the loss rate of the steel plate, reduces the number of splicing welding seams and saves a large amount of construction cost.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic diagram of an improved structure of a construction method for manufacturing a stiffening ring for a pressure steel pipe, wherein A is a schematic diagram of split assembly of the stiffening ring for the pressure steel pipe, and B is a schematic diagram of discharge of the stiffening ring for the pressure steel pipe.
Fig. 2 is a schematic structural diagram of an improved construction method for manufacturing a stiffening ring for a pressure steel pipe according to one embodiment of the present invention, where a is a schematic sectional assembly diagram of the stiffening ring for a pressure steel pipe, and B is a schematic layout diagram of the stiffening ring for a pressure steel pipe.
FIG. 3 is a schematic illustration of a stiffener ring layout according to one embodiment of the present invention.
FIG. 4 is a schematic view of a straight strip of stiffening rings according to one embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a welding auxiliary groove in one embodiment of the present invention, where a is a schematic structural diagram of an elevation of the welding auxiliary groove, and B is a schematic structural diagram of a usage state of the welding auxiliary groove.
FIG. 6 is a diagram showing the results of mechanical property tests of a stiffening ring according to one embodiment of the present invention.
FIG. 7 is a diagram of the result of a metallographic test of a stiffening ring according to one embodiment of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The invention provides a construction method for manufacturing a pressure steel pipe stiffening ring, which comprises the following steps:
1) taking a pressure steel pipe 1 (the pressure steel pipe 1 and a stiffening ring to be welded to the pressure steel pipe 1 are made of the same material, so that the pressure steel pipe 1 is welded to the outside of the pressure steel pipe 1 to have the effects of pressure resistance, stability and the like, and the material of the pressure steel pipe 1 welded to the pressure steel pipe is kept consistent with that of the pressure steel pipe 1), cutting the pressure steel pipe 1 in a straight strip mode along the longitudinal axis direction of the pressure steel pipe 1 by using a numerical control cutting machine to form a stiffening ring straight strip, and dividing the length of each stiffening ring into segments according to the pipe diameter expansion requirement;
2) and rolling the stiffening ring straight strip by using a forming machine to form the radian of the stiffening ring in a rolling process.
According to the construction method, the numerical control cutting machine is used for cutting and blanking in a straight strip mode, and the forming machine is used for rolling, so that the loss rate of the steel plate can be greatly reduced, the number of splicing welding seams is reduced, and the construction cost is saved.
In one embodiment of the present invention, preferably, in the method for manufacturing and constructing stiffening rings of the penstock 1, in step 1), the length of each stiffening ring straight bar is 1/2 of the total length of the required stiffening ring, and the stiffening rings are divided into 2 segments during assembling. As shown in fig. 1, a stiffening ring split is welded outside the pipe wall of a pressure steel pipe 1, the number of the stiffening ring split is 8, and due to the excessive number of the split, the butt welding seam 2 of the stiffening ring is increased, and the welding amount is increased. In the figure 2, the rolled stiffening ring straight strip is adopted, the number of the stiffening ring split is 2, and 2 stiffening ring butt-joint welding lines are formed outside the pipe wall of the pressure steel pipe 1.
In one embodiment of the present invention, preferably, in step 1), the length of each stiffening ring straight bar is 1/2 of the total length of the required stiffening ring, and 2 stiffening ring straight bars are assembled into a stiffening ring.
In one embodiment of the present invention, the method preferably further includes the following steps:
and assembling the 2 straight stiffening ring strips into a stiffening ring.
In one embodiment of the present invention, preferably, the method further includes:
the utility model provides a welding auxiliary tank 3, the standing groove 4 has been seted up along its circumference on the inner wall in welding auxiliary tank 3 for hold stiffening ring vertical bar, welding auxiliary tank 3 semicircular in shape, and its arc length weak point in the arc length of stiffening ring vertical bar, the both ends in welding auxiliary tank 3 have mount 5, two along its radial outside extension in its welding auxiliary tank 3 and fixed two the bolt 6 of mount 5 is connected it into a confined ring shape, wherein, certain space has between mount 5 and the stiffening ring butt joint welding seam 2, certain space is for allowing welding set to carry out welding operation's space.
In one embodiment of the present invention, preferably, in step 1), the pressure steel plate used is purchased according to the expansion length of the stiffening ring, and the cutting compensation and the pre-bending amount are calculated in combination. Ensuring that a stiffening ring straight strip of the appropriate length is obtained.
In one technical scheme of the invention, as an optimization, before the coiling in the step 2), whether the mechanical property of the stiffening ring parent metal is influenced in the coiling process is considered, a process test is carried out according to the curvature radius of the pipe diameter before construction, the mechanical property and a metallographic sample are carried out, and the process feasibility is determined according to the test result.
In one embodiment of the present invention, preferably, in step 1), in the process of blanking the stiffening ring straight strip, directly cutting the lengths required by the straight edge quantity existing at the end parts at two end parts of the preformed stiffening ring straight strip, that is, the length Lo of the end part with the radian is not less than 500mm, and the radian of the cutting arc is determined by the curvature radius of the steel pipe.
In one technical solution of the present invention, preferably, the numerical control cutting machine is a numerical control rotary three-torch cutting machine. The cutting is faster and more accurate.
In one embodiment of the present invention, the method preferably further includes the following steps:
punching holes on two sides of the straight bar of the stiffening ring to form fixing holes, wherein the fixing holes are positioned at two ends of the stiffening ring after being rolled;
when the stiffening rings are assembled, reinforcing ribs are arranged between two adjacent stiffening rings, and two ends of each reinforcing rib are fixed in the fixing holes at one end of each of the two adjacent stiffening rings. Further enhancing the external pressure resistance stability of the penstock 1 and reducing the cost.
In one embodiment of the present invention, preferably, the two ends of the reinforcing rib may form approximately circular enlarged portions, the fixing hole is disposed in cooperation with the enlarged portions, and a hole is left along the edge of the stiffening ring to allow the small diameter portion of the reinforcing rib to pass through, and the reinforcing rib is welded in the fixing hole of the stiffening ring by welding, so as to enhance the compressive strength of the penstock in the longitudinal axis direction.
In order to make the technical solution of the present invention better understood by those skilled in the art, the following examples are now provided for illustration:
the construction method for manufacturing the pressure steel pipe stiffening ring comprises the following steps:
1) a pressure steel pipe 1 is taken, a straight bar form is adopted to be cut along the longitudinal axis direction of the pressure steel pipe 1 by utilizing a numerical control rotary three-cutting-torch cutting machine to form a stiffening ring straight bar, the length of each stiffening ring can be divided into segments according to the requirement of pipe diameter expansion, in the blanking process of the stiffening ring straight bar, the length required by the straight edge quantity of the end part is directly cut at the two end parts of the preformed stiffening ring straight bar, namely, the length Lo of the end part with radian is more than or equal to 500mm, and the radian of a cutting arc is determined by the curvature radius of the steel pipe. The length of each stiffening ring straight strip is 1/2 of the total length of the required stiffening ring, and the stiffening ring straight strip is divided into 2 pieces during assembly; the adopted pressure steel plate 1 is purchased according to the expansion length of the stiffening ring in a fixed length mode, and cutting compensation and pre-bending amount are calculated in a combined mode.
2) And rolling the stiffening ring straight strip by using a forming machine to form the radian of the stiffening ring in a rolling process. Before the coiling in the step 2), considering whether the mechanical property of the stiffening ring parent metal is influenced in the coiling process, performing a process test according to the curvature radius of the pipe diameter before construction, performing mechanical property and metallographic samples, and determining the process feasibility according to the test result.
3) And assembling the 2 straight stiffening ring strips into a stiffening ring. As shown in fig. 5, a welding auxiliary groove is provided, a placement groove 4 is provided on the inner wall of the welding auxiliary groove 3 along the circumferential direction thereof for accommodating the stiffening ring straight bar, the welding auxiliary groove 3 is semicircular and has an arc length shorter than that of the stiffening ring straight bar, two ends of the welding auxiliary groove 3 extend radially outward along the same to form a fixed frame 5, the two welding auxiliary grooves 3 and the bolt 6 for fixing the two fixed frames 5 connect the two fixed frames into a closed circular ring shape, wherein a certain gap is provided between the fixed frame 5 and the stiffening ring butt weld 2, and the certain gap is a space for allowing the welding device to perform welding operation. The position of stiffening ring vertical bar in the standing groove 4 of welding auxiliary tank 3 can be placed as required's interval, like this, when passing through bolt 6 with the welding auxiliary tank and fixing outside the pressure steel pipe, can improve welding efficiency fast, promotes the steadiness of stiffening ring.
As shown in fig. 2, 3 and 4, the technical solution adopted by the present invention to solve the technical problem is:
(1) firstly, the blanking of the stiffening ring is completed by adopting a numerical control cutting machine, but the traditional blanking according to the external camber lofting is not completed. The stiffening ring straight strip is formed by a numerical control rotary three-cutting-torch numerical control cutting machine in a straight strip form, the length of each stiffening ring can be split after the stiffening ring is unfolded according to the pipe diameter, the steel plate is purchased in a fixed length according to the unfolded length of the stiffening ring after splitting, and the cutting compensation and the pre-bending amount are considered during splitting.
(2) After the stiffening ring is fed in a straight strip form, the stiffening ring is rolled by a forming machine, so that the radian of the stiffening ring is formed in the rolling process.
(3) According to the curvature radius of the stiffening ring, whether the mechanical property of the base metal of the stiffening ring is influenced in the rolling process or not is considered before rolling, a process test is required before construction, and the process feasibility is determined according to the process test result.
The specific implementation process is as follows:
(1) firstly, the blanking of the stiffening ring is completed by adopting a numerical control cutting machine, but the traditional blanking according to the external camber lofting is not completed. The stiffening ring straight strip is formed by cutting 3 times by using a numerical control rotating three-cutting torch numerical control cutting machine 6 gun head in a straight strip form, and the length of each stiffening ring is the total length 1/2 of the stiffening ring, namely, the stiffening ring straight strip is divided into 2 pieces during assembly. And (4) purchasing the steel plates according to the expansion length of the stiffening ring in a fixed length mode, and considering cutting compensation and pre-bending amount. As shown in fig. 3.
(2) After the stiffening ring is fed in a straight strip form, the stiffening ring is rolled by a forming machine, so that the radian of the stiffening ring is formed in the rolling process. When the forming machine rolls the stiffening ring, the end part has a straight edge, and the length of the straight edge is about 500 mm. Therefore, in the blanking process of the stiffening ring, required radians are directly cut at two ends of the stiffening ring, namely the length Lo of the end part with radian of the blanking is more than or equal to 500mm, and the radian of the cutting arc is determined by the curvature radius of the steel pipe. As shown in fig. 4.
(3) Whether the mechanical property of the stiffening ring base metal is influenced in the coiling process is considered before coiling, a process test is carried out according to the curvature radius of the pipe diameter before construction, the mechanical property and a metallographic specimen are carried out, and the process feasibility is determined according to the test result.
The stiffening ring manufactured by the method is sent to a quality supervision and detection center of important casting products made of molding materials in the mechanical industry for detection, and a mechanical property detection report obtained by a machine inspection base [2017]16 is shown in the following table, and figures 6 and 7:
mechanical property detection report
The number of modules and the processing scale described herein are intended to simplify the description of the invention. The application, modification and variation of the inventive penstock stiffening ring will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (9)
1. The construction method for manufacturing the pressure steel pipe stiffening ring is characterized by comprising the following steps:
1) taking a pressure steel pipe, cutting the pressure steel pipe along the longitudinal axis direction of the pressure steel pipe in a straight strip form by using a numerical control cutting machine to form stiffening ring straight strips, wherein the length of each stiffening ring can be divided into segments according to the pipe diameter expansion requirement;
2) and rolling the stiffening ring straight strip by using a forming machine to form the radian of the stiffening ring in a rolling process.
2. A method for manufacturing and constructing stiffening rings for pressure steel pipes according to claim 1, wherein in step 1), the length of each stiffening ring straight bar is 1/2 of the total length of the required stiffening ring, and 2 stiffening ring straight bars are assembled into a stiffening ring.
3. A method for constructing a stiffening ring for a pressure steel pipe according to claim 2, further comprising the steps of:
and assembling the 2 straight stiffening ring strips into a stiffening ring.
4. A method for constructing a stiffening ring for a pressure steel pipe according to claim 3, further comprising:
the utility model provides a welding auxiliary groove, the standing groove has been seted up along its circumference on the inner wall in welding auxiliary groove for hold stiffening ring vertical bar, welding auxiliary groove semicircular in shape, and its arc length weak point in the arc length of stiffening ring vertical bar, the both ends in welding auxiliary groove have the mount, two along its radial outside extension in welding auxiliary groove the welding auxiliary groove with fixed two the bolt of mount is connected it and is a confined ring shape, wherein, certain space has between mount and the stiffening ring butt joint welding seam, certain space is for allowing welding set to carry out welding operation's space.
5. A construction method for a stiffening ring of a pressure steel pipe according to claim 1, wherein in the step 1), the adopted pressure steel plate is purchased according to the expansion length of the stiffening ring, and the cutting compensation and the pre-bending amount are calculated in a combined manner.
6. A method for manufacturing and constructing a stiffening ring of a penstock as claimed in claim 1, wherein before the step 2) of rolling, a process test is performed according to the radius of curvature of the pipe diameter before the construction, taking into account whether the mechanical properties of the base material of the stiffening ring are affected during the rolling process, and the process feasibility is determined according to the test results.
7. A construction method for a stiffening ring of a pressure steel pipe as defined in claim 1, wherein in step 1), during the blanking of the stiffening ring straight bar, the lengths required by the straight edges at the ends are directly cut at the two ends of the pre-formed stiffening ring straight bar, that is, the length Lo of the end with radian is not less than 500mm, and the radian of the cutting arc is determined by the curvature radius of the steel pipe.
8. A method for constructing a stiffening ring for a pressure steel pipe according to claim 1, further comprising the steps of:
punching holes on two sides of the straight bar of the stiffening ring to form fixing holes, wherein the fixing holes are positioned at two ends of the stiffening ring after being rolled;
when the stiffening rings are assembled, reinforcing ribs are arranged between two adjacent stiffening rings, and two ends of each reinforcing rib are fixed in the fixing holes at one end of each of the two adjacent stiffening rings.
9. A construction method for a stiffening ring of a pressure steel pipe as recited in claim 1, wherein said NC cutting machine is a NC rotary three-torch cutting machine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111078153.4A CN113909804B (en) | 2021-09-15 | 2021-09-15 | Construction method for manufacturing stiffening ring of pressure steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111078153.4A CN113909804B (en) | 2021-09-15 | 2021-09-15 | Construction method for manufacturing stiffening ring of pressure steel pipe |
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| CN113909804B CN113909804B (en) | 2023-04-25 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10225795A (en) * | 1997-02-14 | 1998-08-25 | Hitachi Plant Eng & Constr Co Ltd | Automatic welding device for piping and welding method for piping |
| KR20090000024U (en) * | 2007-06-28 | 2009-01-07 | 고동일 | pipe welding supporter pipe welding supporter |
| CN102166590A (en) * | 2010-02-26 | 2011-08-31 | 彭智祥 | Annular steel plate and manufacturing process thereof |
| CN207681834U (en) * | 2017-12-23 | 2018-08-03 | 沈阳黎发热能燃机设备配件有限公司 | Gas turbine turbine stator blade sealing ring tooling |
| CN111136137A (en) * | 2020-02-21 | 2020-05-12 | 泰州康祥机械制造有限公司 | Pressure steel pipe stiffening ring rolling equipment and rolling process |
| CN211661443U (en) * | 2020-01-20 | 2020-10-13 | 国泰瑞安股份有限公司 | External butt joint device for welding fire-fighting pipeline |
| CN112570976A (en) * | 2020-12-22 | 2021-03-30 | 中电建路桥集团有限公司 | Semicircle steel pipe fixed-position welding device for steel structure building |
-
2021
- 2021-09-15 CN CN202111078153.4A patent/CN113909804B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10225795A (en) * | 1997-02-14 | 1998-08-25 | Hitachi Plant Eng & Constr Co Ltd | Automatic welding device for piping and welding method for piping |
| KR20090000024U (en) * | 2007-06-28 | 2009-01-07 | 고동일 | pipe welding supporter pipe welding supporter |
| CN102166590A (en) * | 2010-02-26 | 2011-08-31 | 彭智祥 | Annular steel plate and manufacturing process thereof |
| CN207681834U (en) * | 2017-12-23 | 2018-08-03 | 沈阳黎发热能燃机设备配件有限公司 | Gas turbine turbine stator blade sealing ring tooling |
| CN211661443U (en) * | 2020-01-20 | 2020-10-13 | 国泰瑞安股份有限公司 | External butt joint device for welding fire-fighting pipeline |
| CN111136137A (en) * | 2020-02-21 | 2020-05-12 | 泰州康祥机械制造有限公司 | Pressure steel pipe stiffening ring rolling equipment and rolling process |
| CN112570976A (en) * | 2020-12-22 | 2021-03-30 | 中电建路桥集团有限公司 | Semicircle steel pipe fixed-position welding device for steel structure building |
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| CN113909804B (en) | 2023-04-25 |
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