CN111203468A - Machining tool and machining method for forming multi-branch pipe of sodium distributor - Google Patents
Machining tool and machining method for forming multi-branch pipe of sodium distributor Download PDFInfo
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- CN111203468A CN111203468A CN202010022160.1A CN202010022160A CN111203468A CN 111203468 A CN111203468 A CN 111203468A CN 202010022160 A CN202010022160 A CN 202010022160A CN 111203468 A CN111203468 A CN 111203468A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/037—Forming branched tubes
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Abstract
The invention belongs to the technical field of fast reactor cooling, and particularly relates to a processing tool for molding a multi-manifold of a sodium distributor, which comprises a limiting die and a molding die, wherein the limiting die is cylindrical, the molding die is arranged in the limiting die and is provided with a first branch pipe opening, a raw material pipe can be accommodated in the molding die, and when the raw material pipe positioned in the molding die is deformed by extrusion operation from two ends and the inside, the molding die can displace in the limiting die along with the deformation of the raw material pipe; when the extrusion operation is stopped, the displacement of the forming die is finished, the raw material pipe is pressed into a main sodium distributor pipe due to the extrusion operation, and a sodium distributor branch pipe which is communicated with the main sodium distributor pipe and protrudes out of the main sodium distributor pipe is formed in the first branch pipe orifice. The invention adopts a cold deformation method according to the hydraulic bulging principle, thereby avoiding the phenomena of uncontrolled growth of material grain size, uneven grain size and the like caused by multiple heating in the forming process, discontinuous microstructure and welding defects.
Description
Technical Field
The invention belongs to the technical field of fast reactor cooling, and particularly relates to a machining tool and a machining method for forming a multi-manifold of a sodium distributor.
Background
The fast reactor (fast neutron breeder reactor) is the first reactor type of the fourth generation advanced nuclear energy system in the world and represents the development direction of the fourth generation nuclear energy system. The formed closed cycle of the nuclear fuel can improve the utilization rate of uranium resources to more than 60 percent, also can reduce the generation amount of nuclear waste to the maximum extent and realize the minimization of radioactive waste. Fast reactors cannot use water as coolant, and liquid metal sodium is generally used to carry out heat. The sodium distributor is a flow distribution device in a main cooling system of a second loop of the fast reactor, is an important component of a main heat transmission system of the fast reactor, and the reliability of the sodium distributor has important significance on the safe operation of the whole nuclear power station. The working medium of the sodium distributor is liquid sodium, the working temperature is 505 ℃, the working pressure is 0.9Mpa, and the service life is 40 years. The forming method of the cylinder branch pipe of the sodium distributor at present is basically welding branch pipe forming or single branch pipe forming. The number of welding lines of the cylinder body is increased by a single branch pipe; due to the existence of welding seams in branch pipe welding forming, the structural shapes of a welding joint and an equipment cylinder are discontinuous, the microstructure is discontinuous, meanwhile, welding defects possibly exist, the reliability of a product is seriously influenced, and further the safe operation of a fast reactor is influenced.
Disclosure of Invention
The invention aims to design a manufacturing device for forming a multi-branch pipe for a sodium-cooled fast reactor sodium distributor, aiming at the problems that the manufacturing is complicated and welding defects are easy to occur due to the fact that welding or single-branch pipe forming is needed when the existing sodium distributor is formed. The equipment can ensure that the branch pipe is efficiently and safely formed, and the performance and the size of the branch pipe can meet the product requirements.
In order to achieve the purposes, the technical scheme adopted by the invention is a processing tool for molding a multi-branch pipe of a sodium distributor, wherein the processing tool comprises a limiting die with a cylindrical inner part and a molding die which is arranged in the limiting die and is provided with a first branch pipe opening, a raw material pipe can be accommodated in the molding die, and when the raw material pipe positioned in the molding die is deformed by extrusion operation from two ends and the inner part, the molding die can displace in the limiting die along with the deformation of the raw material pipe; and when the extrusion operation is stopped, the displacement of the forming die is finished, the raw material pipe is pressed into a main sodium distributor pipe due to the extrusion operation, and sodium distributor branch pipes which are communicated with the main sodium distributor pipe and protrude out of the main sodium distributor pipe are formed in the first branch pipe openings.
Further, the limiting mould comprises an upper limiting mould and a lower limiting mould, the upper limiting mould and the lower limiting mould are respectively provided with a stroke groove capable of accommodating the first branch pipe orifice, the stroke groove is provided with a second branch pipe orifice, and the stroke groove is used for limiting the direction of the first branch pipe orifice in the extrusion operation process and preventing the forming mould from shifting in the extrusion operation process.
Furthermore, the forming die comprises a fixed embedding module positioned in the middle and sliding modules positioned at two ends of the fixed embedding module, wherein two ends of the fixed embedding module are provided with first comb tooth structures, and one end of the sliding module, which is opposite to the fixed embedding module, is provided with a second comb tooth structure; the shapes of the first comb tooth structure and the second comb tooth structure are matched with each other and can be gradually and alternately connected together along with the displacement.
Further, in the extrusion operation process, the sliding module can move towards the middle along with the deformation of the raw material pipe, so that the sodium distributor branch pipe is uniformly compensated in the forming process, the cracking of the sodium distributor main pipe and the sodium distributor branch pipe is prevented, and the sodium distributor branch pipe is prevented from being eccentric.
Furthermore, the sliding modules at the two ends move along with the extrusion operation, and meanwhile the second comb tooth structures can support the pipe body of the raw material pipe, so that the pipe body is prevented from deforming.
Further, when the moving stroke of the extrusion operation is finished, the sliding modules at the two ends are moved to be finished, at this time, the first comb tooth structures and the second comb tooth structures are connected in place in a staggered mode, and the first branch pipe openings and the second branch pipe openings are overlapped.
Further, the first and second branch pipe openings are at right angles to the axis of the sliding module.
Further, the first branch pipe opening can accommodate therein a sodium distributor branch pipe generated from the raw material pipe due to the deformation.
In order to achieve the above object, the present invention also discloses a method for forming a sodium distributor manifold, which is used for the above tool for forming a sodium distributor manifold, and comprises the following steps:
step S1, the upper limit die and the lower limit die are respectively fixed on an upper working platform and a lower working platform of the hydraulic press, the fixed embedding module is fixed in the middle of the lower limit die, the sliding modules at two ends are respectively matched with the fixed embedding module left and right through sliding, and the first branch pipe openings are respectively arranged in the stroke grooves of the upper limit die and the lower limit die;
step S2, respectively aligning a left pushing head and a right pushing head of a cold pusher with the sliding modules at two ends, conveying a liquid medium into the raw material pipe by virtue of a one-way valve while the left pushing head and the right pushing head of the cold pusher simultaneously work towards the fixed embedding module, and enabling pressure generated by the liquid medium to act on the raw material pipe to enable the raw material pipe to form a bulge at the first branch pipe orifice so as to form a prototype of the sodium distributor branch pipe; this process is continued until the moving stroke of the pressing operation is completed, the convex portion of the raw material pipe enters the first branch pipe opening to form a sodium distributor branch pipe protruding from the sodium distributor main pipe, and at this time, the raw material pipe is pressed into a sodium distributor consisting of the sodium distributor main pipe and the sodium distributor branch pipe.
Further, before the step S1, the distance of displacement of the raw material pipe from the beginning to the end of the extrusion operation needs to be calculated, so as to determine the sizes of the first comb tooth structure and the second comb tooth structure, and determine the moving stroke of the first branch pipe orifice in the stroke grooves of the upper limit die and the lower limit die.
The invention has the beneficial effects that:
1. according to the principle of hydraulic bulging, a cold deformation method is adopted, so that the phenomena of uncontrolled growth of material grain size, uneven grain size and the like caused by multiple heating in the forming process are avoided; compared with hot forming, cold forming reduces the use of fuel gas energy and reduces environmental pollution; the heating process is reduced, the operation is simplified, and the production efficiency of the product is improved.
2. The method has the advantages that the appearance of the welding line is avoided under high temperature and high load, the creep phenomenon of the welding line generated at metal temperature is eliminated, the safety of the product structure is effectively improved, the accessibility requirement of in-service inspection is met, and the safe and reliable operation of the sodium distributor under the high temperature and high load environment is ensured.
3. The invention has simple structure, and the sodium distributor formed by the improved method and the mould can avoid the defects of discontinuous structural shape, discontinuous microstructure and other welding defects caused by welding seams while avoiding the problems of easy cracking, eccentricity and uneven wall thickness of the sodium distributor branch pipe. And the molding is carried out at one time, and the segmentation is not needed, thereby greatly improving the production efficiency.
Drawings
FIG. 1 is a schematic view of a sodium dispenser manifold forming tooling according to an embodiment of the present invention;
FIG. 2 is a schematic view of an upper confinement mold according to an embodiment of the present invention;
FIG. 3 is a schematic view of a forming die according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a deformation process of a raw material pipe processed into a sodium distributor in the process of a processing method for forming a manifold of the sodium distributor according to an embodiment of the present invention (the sodium distributor in the figure is a staggered four-way structure);
in the figure: 1-upper limiting die, 2-lower limiting die, 3-stroke groove, 4-fixed embedded module, 5-sliding module, 6-first comb structure, 7-second comb structure, 8-first branch pipe orifice, 9-raw material pipe, 10-sodium distributor main pipe, 11-sodium distributor branch pipe, and 12-second branch pipe orifice.
Detailed Description
The invention is further described below with reference to the figures and examples.
The invention provides a processing tool for molding a sodium distributor manifold, which comprises a limiting die and a molding die.
As shown in fig. 1, the inside of the limiting mold is cylindrical, the forming mold is arranged in the limiting mold and is provided with a first branch pipe opening 8, a raw material pipe 9 to be extruded and formed can be accommodated in the forming mold, and when the raw material pipe 9 in the forming mold is deformed by extrusion operation from two ends and the inside, the forming mold can be displaced in the limiting mold along with the deformation of the raw material pipe 9; when the pressing operation is stopped, the displacement of the molding die is ended, the raw material pipe 9 is pressed into the main sodium distributor pipe 10 due to the pressing operation, and the sodium distributor branch pipes 11 communicating with the main sodium distributor pipe 10 and protruding from the main sodium distributor pipe 10 are formed in the first branch pipe mouths 8.
As shown in fig. 1 and 2, the limiting mold comprises an upper limiting mold 1 and a lower limiting mold 2, wherein a stroke groove 3 capable of accommodating a first branch pipe orifice 8 is respectively arranged in the upper limiting mold 1 and the lower limiting mold 2, a second branch pipe orifice 12 is arranged on the stroke groove 3, and the stroke groove 3 is used for limiting the direction of the first branch pipe orifice 8 in the extrusion operation process and preventing the displacement of the forming mold in the extrusion operation process from deviating.
As shown in fig. 1 and 3, the forming mold comprises a fixed mosaic module 4 located in the middle and sliding modules 5 located at two ends of the fixed mosaic module 4, wherein two ends of the fixed mosaic module 4 are provided with first comb tooth structures 6, and one end of the sliding module 5 opposite to the fixed mosaic module 4 is provided with a second comb tooth structure 7; the shapes of the first comb tooth structure 6 and the second comb tooth structure 7 are matched with each other and can be gradually and alternately connected together along with displacement.
During the extrusion operation, the sliding module 5 can move toward the middle along with the deformation of the raw material pipe 9, so that the sodium distributor branch pipes 11 are uniformly compensated during the forming process, the main sodium distributor pipe 10 and the sodium distributor branch pipes 11 are prevented from cracking, and the sodium distributor branch pipes 11 are prevented from being eccentric.
The second comb tooth structures 7 can support the pipe body of the raw material pipe 9 while the sliding modules 5 at the two ends move along with the extrusion operation, so that the deformation of the pipe body is avoided.
When the moving stroke of the extrusion operation is finished, the sliding modules 5 at the two ends are moved, at the moment, the first comb tooth structures 6 and the second comb tooth structures 7 are connected in place in a staggered mode, and the first branch pipe orifices 8 and the second branch pipe orifices 12 are overlapped, so that the forming size precision of the sodium distributor branch pipes 11 is guaranteed, and the positions of the sodium distributor branch pipes 11 are determined.
The first and second lateral orifices 8, 12 are at right angles to the axis of the sliding module 5.
The first branch pipe mouth 8 can accommodate therein a sodium distributor branch pipe 11 generated from the raw material pipe 9 due to deformation.
The processing method for forming the sodium distributor manifold by adopting the processing tool for forming the sodium distributor manifold comprises the following steps:
in step S1, the distance of displacement of the raw material pipe 9 from the start to the end of the extrusion operation (i.e., the amount of displacement of the raw material pipe 9 from the original state to the end state of the extrusion operation) is calculated to determine the sizes of the first and second comb tooth structures 6 and 7, and the movement stroke of the first branch pipe orifice 8 in the stroke groove 3 of the upper and lower limit molds 1 and 2 (i.e., the stroke of the branch pipe, and the mold is designed with this as a reference). The upper limiting die 1 and the lower limiting die 2 are respectively fixed on an upper working platform and a lower working platform of a hydraulic machine, the fixed embedding module 4 is fixed in the middle of the lower limiting die 2, the sliding modules 5 at two ends are respectively matched with the fixed embedding module 4 left and right through sliding, and the first branch pipe openings 8 are respectively arranged in the stroke grooves 3 of the upper limiting die 1 and the lower limiting die 2.
Step S2, respectively aligning the left and right pushing heads of the cold pusher with the sliding modules 5 at the two ends, conveying a liquid medium into the raw material pipe 9 by virtue of a one-way valve while the left and right pushing heads of the cold pusher simultaneously work towards the fixed mosaic module 4, and enabling the pressure generated by the liquid medium to act on the raw material pipe 9 to enable the raw material pipe 9 to form a bulge at the first branch pipe orifice 8 so as to form a prototype of the sodium distributor branch pipe 11; this process is continued until the moving stroke of the pressing operation is completed, and the convex portion of the raw material pipe 9 enters the first branch pipe opening 8 to form the sodium distributor branch pipe 11 protruding from the main sodium distributor pipe 10, at which time the raw material pipe 9 is pressed into the sodium distributor formed by the main sodium distributor pipe 10 and the sodium distributor branch pipe 11 (the deformation process of the raw material pipe 9 into the sodium distributor is shown in fig. 4). The sliding modules 5 at the two ends move towards the middle along with the raw material pipe 9 in the extrusion operation process, namely the forming process of the sodium distributor branch pipes 11, so that the convex bulges move together, the sodium distributor branch pipes 11 are uniformly compensated in the forming process, namely the back and the long shaft shoulder of the sodium distributor main pipe 10 can compensate the sodium distributor branch pipes 11 in time, the sodium distributor main pipe 10 is prevented from cracking, and the sodium distributor branch pipes 11 are prevented from being eccentric. The second comb tooth structures 7 of the sliding modules 5 at the two ends are comb-shaped and are matched with the first comb tooth structures 6 on the middle fixed embedded module 4 in a left-right mode, the sliding modules 5 at the two ends move towards the middle together, meanwhile, the second comb tooth structures 7 can also support the main pipe 10 of the sodium distributor, and the comb-shaped matched gaps of the second comb tooth structures 7 avoid the deformation of the main pipe 10 of the sodium distributor.
In the extrusion process, when the pressure in the main pipe 10 of the sodium distributor is too high, the pressure can be released through the one-way valve at the other end of the cold pushing machine, so that the cracking and deformation of the main pipe 10 of the sodium distributor caused by the too high pressure are prevented; when the moving strokes of the sliding modules 5 at the two ends are finished, the moving strokes of the second comb-tooth structures 7 and the first comb-tooth structures 6 are also finished at the same time, as shown in fig. 1, the first branch pipe orifice 8 and the second branch pipe orifice 12 are overlapped, the position of the sodium distributor branch pipe 11 is determined, the staggered area of the first comb-tooth structures 6 and the second comb-tooth structures 7 reaches the maximum, the main sodium distributor pipe 10 is prevented from being deformed due to the blank of a mold, and after the constant pressure is kept at the moment, as shown in the third state of fig. 4, the sodium distributor branch pipe 11 is formed.
The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.
Claims (10)
1. A processing tool for forming a manifold of a sodium distributor is characterized in that: the forming die comprises a limiting die with a cylindrical inner part and a forming die which is arranged in the limiting die and provided with a first branch pipe orifice (8), wherein a raw material pipe (9) can be accommodated in the forming die, and when the raw material pipe (9) positioned in the forming die is deformed by extrusion operation from two ends and the inner part, the forming die can be displaced in the limiting die along with the deformation of the raw material pipe (9); when the extrusion operation is stopped, the displacement of the forming die is finished, the raw material pipe (9) is pressed into a main sodium distributor pipe (10) due to the extrusion operation, and a sodium distributor branch pipe (11) which is communicated with the main sodium distributor pipe (10) and protrudes out of the main sodium distributor pipe (10) is formed in the first branch pipe orifice (8).
2. The tool of claim 1, wherein: spacing mould includes upper limit mould (1) and lower limit mould (2), upper limit mould (1) with be equipped with respectively in lower limit mould (2) and to hold stroke groove (3) of first mouth of pipe (8) be equipped with second mouth of pipe (12) on stroke groove (3), stroke groove (3) are used for the restriction first mouth of pipe (8) are in direction in the extrusion operation process prevents forming die is in the skew takes place for the displacement in the extrusion operation process.
3. The tool of claim 2, wherein: the forming die comprises a fixed embedding module (4) positioned in the middle and sliding modules (5) positioned at two ends of the fixed embedding module (4), wherein two ends of the fixed embedding module (4) are provided with first comb tooth structures (6), and one end of each sliding module (5) opposite to the fixed embedding module (4) is provided with a second comb tooth structure (7); the shapes of the first comb tooth structure (6) and the second comb tooth structure (7) are matched with each other and can be gradually and alternately connected together along with the displacement.
4. The tool of claim 3, wherein: in the extrusion operation process, the sliding module (5) can move towards the middle along with the deformation of the raw material pipe (9), so that the sodium distributor branch pipes (11) are uniformly compensated in the forming process, the cracking of the sodium distributor main pipe (10) and the sodium distributor branch pipes (11) is prevented, and the sodium distributor branch pipes (11) are prevented from being eccentric.
5. The tool of claim 4, wherein: the sliding modules (5) at the two ends move along with the extrusion operation, and meanwhile, the second comb tooth structures (7) can support the pipe body of the raw material pipe (9), so that the pipe body is prevented from deforming.
6. The tool of claim 5, wherein: and when the moving stroke of the extrusion operation is finished, the sliding modules (5) at the two ends are moved to the end, at the moment, the first comb tooth structures (6) and the second comb tooth structures (7) are connected in place in a staggered mode, and the first branch pipe orifices (8) and the second branch pipe orifices (12) are overlapped.
7. The tool of claim 6, wherein: the first branch pipe orifice (8) and the second branch pipe orifice (12) are at right angles to the axis of the sliding module (5).
8. The tool of claim 7, wherein: the first branch pipe orifice (8) can accommodate therein a sodium distributor branch pipe (11) generated from the raw material pipe (9) due to the deformation.
9. A method of forming a sodium dispenser manifold using the sodium dispenser manifold forming tool of claim 8, comprising the steps of:
step S1, the upper limit die (1) and the lower limit die (2) are respectively fixed on an upper working platform and a lower working platform of a hydraulic press, the fixed embedding module (4) is fixed in the middle of the lower limit die (2), the sliding modules (5) at two ends are respectively matched with the fixed embedding module (4) left and right through sliding, and the first branch pipe orifices (8) are respectively arranged in the stroke grooves (3) of the upper limit die (1) and the lower limit die (2);
step S2, respectively aligning a left pushing head and a right pushing head of a cold pusher with the sliding modules (5) at two ends, conveying a liquid medium into the raw material pipe (9) by virtue of a one-way valve while the left pushing head and the right pushing head of the cold pusher simultaneously work towards the fixed embedding module (4), and enabling pressure generated by the liquid medium to act on the raw material pipe (9) to enable the raw material pipe (9) to form a bulge at the first branch pipe orifice (8) so as to form a prototype of the sodium distributor branch pipe (11); this process is continued until the moving stroke of the pressing operation is completed, the convex part on the raw material pipe (9) enters the first branch pipe orifice (8) to form a sodium distributor branch pipe (11) protruding from the sodium distributor main pipe (10), and at this time, the raw material pipe (9) is pressed into a sodium distributor consisting of the sodium distributor main pipe (10) and the sodium distributor branch pipe (11).
10. The process of claim 9 wherein: before the step S1, the distance of displacement of the raw material pipe (9) from the beginning to the end of the extrusion operation needs to be calculated, so as to determine the sizes of the first comb tooth structure (6) and the second comb tooth structure (7), and determine the moving stroke of the first branch pipe orifice (8) in the stroke slot (3) of the upper limit die (1) and the lower limit die (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010022160.1A CN111203468B (en) | 2020-01-09 | 2020-01-09 | Machining tool and machining method for forming multi-branch pipe of sodium distributor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010022160.1A CN111203468B (en) | 2020-01-09 | 2020-01-09 | Machining tool and machining method for forming multi-branch pipe of sodium distributor |
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| CN111203468A true CN111203468A (en) | 2020-05-29 |
| CN111203468B CN111203468B (en) | 2021-07-20 |
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| CN202010022160.1A Active CN111203468B (en) | 2020-01-09 | 2020-01-09 | Machining tool and machining method for forming multi-branch pipe of sodium distributor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114833247A (en) * | 2021-02-02 | 2022-08-02 | 偃师东方管件有限公司 | Production process of hydrogenation mixer tee joint |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4979957A (en) * | 1972-12-04 | 1974-08-01 | ||
| JPS54155969A (en) * | 1978-05-31 | 1979-12-08 | Nippon Bulge Ind | Liquid pressure bulge process |
| FR2535987A1 (en) * | 1982-11-16 | 1984-05-18 | Vallourec | Method of forming one or more bulbs by the plastic deformation during expansion of the wall of a section of pipe |
| CN108555108A (en) * | 2018-04-13 | 2018-09-21 | 南昌航空大学 | A kind of three-way pipe expansion forming device and three-way pipe branch pipe expansion forming method |
| CN208628221U (en) * | 2018-08-08 | 2019-03-22 | 江苏新恒基特种装备股份有限公司 | A kind of seamless dislocation four-way one-shot forming apparatus |
-
2020
- 2020-01-09 CN CN202010022160.1A patent/CN111203468B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4979957A (en) * | 1972-12-04 | 1974-08-01 | ||
| JPS54155969A (en) * | 1978-05-31 | 1979-12-08 | Nippon Bulge Ind | Liquid pressure bulge process |
| FR2535987A1 (en) * | 1982-11-16 | 1984-05-18 | Vallourec | Method of forming one or more bulbs by the plastic deformation during expansion of the wall of a section of pipe |
| CN108555108A (en) * | 2018-04-13 | 2018-09-21 | 南昌航空大学 | A kind of three-way pipe expansion forming device and three-way pipe branch pipe expansion forming method |
| CN208628221U (en) * | 2018-08-08 | 2019-03-22 | 江苏新恒基特种装备股份有限公司 | A kind of seamless dislocation four-way one-shot forming apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114833247A (en) * | 2021-02-02 | 2022-08-02 | 偃师东方管件有限公司 | Production process of hydrogenation mixer tee joint |
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| CN111203468B (en) | 2021-07-20 |
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