CN105397398A - Jacket heat exchanger straight pipe inner pipe deep hole welding assembly device and jacket heat exchanger - Google Patents
Jacket heat exchanger straight pipe inner pipe deep hole welding assembly device and jacket heat exchanger Download PDFInfo
- Publication number
- CN105397398A CN105397398A CN201510923426.9A CN201510923426A CN105397398A CN 105397398 A CN105397398 A CN 105397398A CN 201510923426 A CN201510923426 A CN 201510923426A CN 105397398 A CN105397398 A CN 105397398A
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- CN
- China
- Prior art keywords
- jacket heat
- pipe
- cone
- axis
- exchanger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0531—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor internal pipe alignment clamps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
- F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a jacket heat exchanger straight pipe inner pipe deep hole welding assembly device used for assembly between jacket heat exchanger straight pipe inner pipes. The assembly device is symmetrically arranged with respect to the center line of a pipe shaft. The assembly device comprises a guide pipe, a cone shaft connected with the guide pipe and a sleeve matched with the cone shaft in taper. The assembly device stretches into the jacket heat exchanger straight pipe inner pipes. Under the action of external force, the sleeve is pushed into a seam of the two adjacent inner pipes through the cone shaft and meanwhile expanded so as to straighten the two adjacent inner pipes, and the outer surface of the sleeve can be closely attached to the inner walls of the two adjacent inner pipes. According to a jacket heat exchanger, the straight pipe inner pipes of the jacket heat exchanger are assembled, welded and connected through the assembly device. Compared with the prior art, the problems that due to the too small inner diameter of a pipe fitting, assembly is difficult, the pipe inner surface weld reinforcement cannot be ground flat after assembly, the labor intensity of inner seam grinding is large, efficiency is low, and the grinding quality is not stable can be effectively solved. Meanwhile, the jacket heat exchanger straight pipe inner pipe deep hole welding assembly device and the jacket heat exchanger have the beneficial effects that the structure is simple, operation is easy and convenient, positioning precision is high, and repeated usage can be achieved.
Description
Technical field
The application relate between the pipe fitting in petrochemical equipment accurate group to and welding technology field, be particularly applicable to pipe in various jacket pipe be positioned at inner compared with deep location time, require uniform internal diameter inside pipe and etc. the right a kind of jacket heat-exchanger straight tube pipe Deep Hole Welding group of the staggered edge free group of two sections of pipe fittings of wall thickness to device and jacket heat-exchanger.
Background technology
In petrochemical equipment, such as, between the pipe fitting of heating furnace, pyrolysis furnace, rapid-cooling heat exchanger and important pipe fitting, pipeline etc. accurate group to and welding in, usually require two pipe fittings group to after meet its inner surface staggered edge free, the solder technology requirements such as after welding its inner surface weld seam nothing left is high.And inner surface weld grinding is concordant with mother metal, and can not mother metal be injured, because weld seam is positioned at the very dark position of pipe, several meters or tens meters are reached from pipe end, in the prior art mainly by manual polishing, labour intensity is comparatively large, inefficiency, and is difficult to ensure the quality of products, particularly the usual internal diameter of pipe fitting is less, and milling tools is limited and cannot polish and check.
Therefore, research and develop a kind of can effectively solve all size, material pipe fitting group to rear inner surface staggered edge free, the group of the problems such as after welding its inner surface weld seam nothing left is high is to device and to adopt this group device to be grouping to the structure of the jacket heat-exchanger of welding particularly important.
Summary of the invention
One of object of the application to provide in a kind of jacket heat-exchanger straight tube pipe Deep Hole Welding group to device for solving the deficiencies in the prior art, this group is utilized to make two pipe fittings group to its inner surface staggered edge free rear to device, make to weld rear two pipe fittings inner surface weld seam without reinforcement, thus reduce labour intensity, raising assembly welding efficiency, ensure product quality.
Two of the object of the application provides a kind of jacket heat-exchanger connected device welding by pipe Deep Hole Welding group in above-mentioned a kind of jacket heat-exchanger straight tube for solving the deficiencies in the prior art.
One of object of the application is achieved through the following technical solutions:
To provide in a kind of jacket heat-exchanger straight tube pipe Deep Hole Welding group to device, right for the group in jacket heat-exchanger straight tube between pipe, described group is symmetrical arranged with tubular axis center line device, described group comprises the axis of cone of conduit and tubes connection to device, and with the sleeve of axis of cone taper fit, described group to be stretched in jacket heat-exchanger straight tube device and manages, under external force, sleeve is advanced into the piece of two adjacent inner tube and supports large sleeve simultaneously by the axis of cone, makes the outer surface of sleeve be close to the inwall of two adjacent inner tube with more straight two adjacent inner tube.
Preferably, one end that the described axis of cone connects with described conduit is for hold greatly, and the described axis of cone is small end away from one end of described conduit, and the external taper of the described axis of cone and the internal taper of described sleeve match.
Preferably, the outer circumferential side of described conduit is provided with location-plate.
Preferably, described location-plate is plectane or rolling bearing.
Preferably, the described axis of cone is the axis of cone that solid round steel is formed or the axis of cone rolled into for cored slab.
Preferably, the described axis of cone offers cross-perforating along the axis of pipe in jacket heat-exchanger straight tube, described cross-perforating is communicated with described conduit, the described axis of cone offers along the radial direction of pipe in jacket heat-exchanger straight tube the radial perforation be communicated with described cross-perforating, and described radial perforation is communicated with the radial perforation of described sleeve and just to the piece of two adjacent inner tube.
Two of the object of the application is achieved through the following technical solutions:
Additionally provide a kind of jacket heat-exchanger, comprise the sleeve-type heat exchanging pipe be made up of inner and outer tubes, wherein, by pipe Deep Hole Welding group in a kind of jacket heat-exchanger straight tube described above, device welding is connected between pipe in the straight tube of described jacket heat-exchanger.
the beneficial effect of the application:
In a kind of jacket heat-exchanger straight tube of the application, pipe Deep Hole Welding group is to device, right for the group in jacket heat-exchanger straight tube between pipe, described group is symmetrical arranged with tubular axis center line device, described group comprises the axis of cone of conduit and tubes connection to device, and with the sleeve of axis of cone taper fit, described group to be stretched in jacket heat-exchanger straight tube device and manages, under external force, sleeve is advanced into the piece of two adjacent inner tube and supports large sleeve simultaneously by the axis of cone, makes the outer surface of sleeve be close to the inwall of two adjacent inner tube with more straight two adjacent inner tube.A kind of jacket heat-exchanger of the application, comprises the sleeve-type heat exchanging pipe be made up of inner and outer tubes, wherein, is connected in the straight tube of described jacket heat-exchanger between pipe by pipe Deep Hole Welding group in a kind of jacket heat-exchanger straight tube described above to device welding.Compared with prior art, the generation of the problems such as the application effectively can avoid the group that causes because pipe fitting internal diameter is too small to difficulty, pipe internal surface weld reinforcement cannot be polished after assembly welding, the labour intensity of inseam of polishing is large, efficiency is low, polishing quality is unstable, have that structure is simple, easy and simple to handle, positioning precision is high, repeatedly used feature simultaneously, and adopt the application group to after the welding quality stable that carries out, two pipe fittings group is to rear inner surface staggered edge free, and after welding, its inner surface weld seam is without reinforcement; Weldquality is good and shaping without the need to checking inseam; Adopting this group to be grouping the jacket heat-exchanger after welding to device, to have welding quality good, the features such as packaging efficiency is high, long service life.
Accompanying drawing explanation
Fig. 1 be the application a kind of jacket heat-exchanger straight tube in pipe Deep Hole Welding group to the structural representation of the embodiment 1 of device.
Include in FIG:
Sleeve 1, the axis of cone 2, conduit 3, location-plate 4,
Weld reinforcement A, External Force Acting B.
Detailed description of the invention
Embodiment in is by reference to the accompanying drawings further described by the application below:
It should be noted that: the jacket heat-exchanger that the application mentions can be rapid-cooling heat exchanger, this jacket heat-exchanger is made up of multiple jacket pipe, so-called jacket pipe refers to that the pipe box that overall diameter is less enters in the pipe formed inside the larger pipe of interior diameter to have tubular construction, the group that the application is applied in jacket heat-exchanger straight tube between pipe is right, also comprises the welding of the interior pipe of straight tube and the connector at both ends.
embodiment 1
In a kind of jacket heat-exchanger straight tube of the application, pipe Deep Hole Welding group is to the detailed description of the invention of device, as shown in Figure 1, right for the group in jacket heat-exchanger straight tube between pipe, described group is symmetrical arranged with tubular axis center line device, described group comprises conduit 3 to device, the axis of cone 2 be connected with conduit 3, and with the sleeve 1 of the axis of cone 2 taper fit, described group to be stretched in jacket heat-exchanger straight tube device and manages, under External Force Acting B effect, sleeve 1 is advanced into the piece of two adjacent inner tube and supports large sleeve 1 simultaneously by the axis of cone 2, the outer surface of sleeve 1 is made to be close to the inwall of two adjacent inner tube with more straight two adjacent inner tube.External Force Acting is on conduit 3, by force transmission to the axis of cone 2, sleeve 1 is supportted large and more straight two pipe fittings be close to the inwall of two pipe fittings automatically by the axis of cone 2, make the inner surface staggered edge free of two pipe fittings, when making two pipe fittings piece in flat-position welding termination process, by gravity and Arc effect, the metal drop declined is propped up by sleeve 1 entirely, and weld reinforcement A cannot be formed at piece inner surface, here cannot form weld reinforcement A at piece inner surface to refer to, the surface straight line concordant with the inner surface of piece weld seam of two pipe fittings is arranged.After welding completes, External Force Acting knocks gently and rear pull catheter 3 can make the axis of cone 2 and sleeve 1 get loose, to extract out outside pipe fitting.
Concrete, one end that the described axis of cone 2 connects with described conduit 3 is for hold greatly, and the described axis of cone 2 is small end away from one end of described conduit 3, and the external taper of the described axis of cone 2 and the internal taper of described sleeve 1 match.The setting of the axis of cone 2, makes the axis of cone 2 by after external force, sleeve 1 being supportted large and more straight two pipe fittings be close to two pipe fittings inwall, inner surface staggered edge free automatically.
Concrete, the outer circumferential side of described conduit 3 is provided with location-plate 4.Adopt location-plate 4 and conduit 3 easy to connect group of operation to device, and play fixed supported effect, also play auxiliary concentricity and the auxiliary staggered edge free ensureing two pipe fittings simultaneously.Preferably, described location-plate 4 is plectane or rolling bearing.
Concrete, the described axis of cone 2 be the axis of cone 2 of solid round steel formation or the axis of cone 2 that rolls into for cored slab.
Concrete, the described axis of cone 2 offers cross-perforating along the axis of pipe in jacket heat-exchanger straight tube, described cross-perforating is communicated with described conduit 3, the described axis of cone 2 offers along the radial direction of pipe in jacket heat-exchanger straight tube the radial perforation be communicated with described cross-perforating, and described radial perforation is communicated with the radial perforation of described sleeve 1 and just to the piece of two adjacent inner tube.When high-alloy steel or low-alloy steel welding, required protective gas can pass into from conduit 3, through the cross-perforating of the axis of cone 2, radial perforation and and sleeve 1 on radial perforation out just to the root of piece, and effectively protect welding.
Sleeve 1 is that the material different with pipe fitting is made, and sleeve 1 forms a cylindrical shell concordant with pipe fitting inner wall.When making two pipe fittings piece in flat-position welding termination process, by gravity and Arc effect, the metal drop declined is propped up by sleeve 1 entirely, and reinforcement weld seam cannot be formed at interior seam surface, fundamentally solve inseam reinforcement problem.
embodiment 2
The detailed description of the invention of a kind of jacket heat-exchanger of the application, comprise the sleeve-type heat exchanging pipe be made up of inner and outer tubes, wherein, by pipe Deep Hole Welding group in a kind of jacket heat-exchanger straight tube described in above-described embodiment 1, device welding is connected between pipe in the straight tube of described jacket heat-exchanger.Adopting this group to be grouping the jacket heat-exchanger after welding to device, to have welding quality good, the features such as packaging efficiency is high, long service life.
Finally should be noted that; above embodiment is only in order to illustrate the technical scheme of the application; but not the restriction to the application's protection domain; although done to explain to the application with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to the technical scheme of the application or equivalent replacement, and not depart from essence and the scope of technical scheme.
Claims (7)
1. in a jacket heat-exchanger straight tube pipe Deep Hole Welding group to device, it is characterized in that: right for the group in jacket heat-exchanger straight tube between pipe, described group is symmetrical arranged with tubular axis center line device, described group comprises the axis of cone of conduit and tubes connection to device, and with the sleeve of axis of cone taper fit, described group to be stretched in jacket heat-exchanger straight tube device and manages, under external force, sleeve is advanced into the piece of two adjacent inner tube and supports large sleeve simultaneously by the axis of cone, makes the outer surface of sleeve be close to the inwall of two adjacent inner tube with more straight two adjacent inner tube.
2. in a kind of jacket heat-exchanger straight tube according to claim 1 pipe Deep Hole Welding group to device, it is characterized in that: one end that the described axis of cone connects with described conduit is for hold greatly, the described axis of cone is small end away from one end of described conduit, and the external taper of the described axis of cone and the internal taper of described sleeve match.
3. in a kind of jacket heat-exchanger straight tube according to claim 2, pipe Deep Hole Welding group, to device, is characterized in that: the outer circumferential side of described conduit is provided with location-plate.
4. in a kind of jacket heat-exchanger straight tube according to claim 3, pipe Deep Hole Welding group, to device, is characterized in that: described location-plate is plectane or rolling bearing.
5. in a kind of jacket heat-exchanger straight tube according to claim 1, pipe Deep Hole Welding group, to device, is characterized in that: the described axis of cone is the axis of cone that solid round steel is formed or the axis of cone rolled into for cored slab.
6. in a kind of jacket heat-exchanger straight tube according to claim 1 pipe Deep Hole Welding group to device, it is characterized in that: the described axis of cone offers cross-perforating along the axis of pipe in jacket heat-exchanger straight tube, described cross-perforating is communicated with described conduit, the described axis of cone offers along the radial direction of pipe in jacket heat-exchanger straight tube the radial perforation be communicated with described cross-perforating, and described radial perforation is communicated with the radial perforation of described sleeve and just to the piece of two adjacent inner tube.
7. a jacket heat-exchanger, comprise the sleeve-type heat exchanging pipe be made up of inner and outer tubes, it is characterized in that: by pipe Deep Hole Welding group in a kind of jacket heat-exchanger straight tube in claim 1 to 6 described in any one, device welding is connected between pipe in the straight tube of described jacket heat-exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510923426.9A CN105397398A (en) | 2015-12-14 | 2015-12-14 | Jacket heat exchanger straight pipe inner pipe deep hole welding assembly device and jacket heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510923426.9A CN105397398A (en) | 2015-12-14 | 2015-12-14 | Jacket heat exchanger straight pipe inner pipe deep hole welding assembly device and jacket heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105397398A true CN105397398A (en) | 2016-03-16 |
Family
ID=55463326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510923426.9A Pending CN105397398A (en) | 2015-12-14 | 2015-12-14 | Jacket heat exchanger straight pipe inner pipe deep hole welding assembly device and jacket heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105397398A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109732230A (en) * | 2018-12-29 | 2019-05-10 | 哈电集团（秦皇岛）重型装备有限公司 | A method of adapter tube welding |
| CN109773401A (en) * | 2019-03-27 | 2019-05-21 | 东北石油大学 | The rotary insertion expanding cushion device of pipeline welding |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1878725A (en) * | 1931-05-25 | 1932-09-20 | Stovall Fred | Expansible pipe holder |
| US2167896A (en) * | 1937-07-15 | 1939-08-01 | Nat Tube Co | Plug for lining up and welding casing and line pipe |
| US3498518A (en) * | 1967-07-27 | 1970-03-03 | Guild Metal Joining Equipment | Combination pipe welding and testing mandrel |
| US3684149A (en) * | 1970-11-23 | 1972-08-15 | Stewarts & Lloyds Ltd | Expansible tools |
| FR2329401A1 (en) * | 1975-10-27 | 1977-05-27 | Socea | Aligning two pipes for butt welding, using expanding mandrel - to obtain smooth bore for pneumatic conveying of fragile goods |
| CN1060929A (en) * | 1990-09-17 | 1992-05-06 | 株式会社日立制作所 | Its manufacture method of structure and equipment with canister of the person in charge and arm |
| US5395142A (en) * | 1992-05-07 | 1995-03-07 | Hmc H. Meyer & Co. Spezialstahl Gmbh | Welding joint and backing sleeve therefore |
| JPH07214380A (en) * | 1994-02-02 | 1995-08-15 | Yokohama Rubber Co Ltd:The | Fixing jig for welding tube body |
| EP1207003B1 (en) * | 2000-11-17 | 2004-02-25 | Werner Jankus | Device for inner centering of tubes to be welded together |
| CN2924458Y (en) * | 2006-06-06 | 2007-07-18 | 刘军 | Tubular jacketed heat exchanger |
| CN202507016U (en) * | 2012-03-16 | 2012-10-31 | 贵州红湖发动机零部件有限公司 | Expanding and welding device for annular weld joints of sheet metal parts in automatic welding process |
| CN203076844U (en) * | 2013-01-28 | 2013-07-24 | 杭州国能汽轮工程有限公司 | Pipe opening automatic welding eccentric locating shaft sleeve |
| CN205309685U (en) * | 2015-12-14 | 2016-06-15 | 茂名重力石化机械制造有限公司 | It welds group to ware and clamp cover heat exchanger to press from both sides cover heat exchanger straight tube inner tube deep hole |
-
2015
- 2015-12-14 CN CN201510923426.9A patent/CN105397398A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1878725A (en) * | 1931-05-25 | 1932-09-20 | Stovall Fred | Expansible pipe holder |
| US2167896A (en) * | 1937-07-15 | 1939-08-01 | Nat Tube Co | Plug for lining up and welding casing and line pipe |
| US3498518A (en) * | 1967-07-27 | 1970-03-03 | Guild Metal Joining Equipment | Combination pipe welding and testing mandrel |
| US3684149A (en) * | 1970-11-23 | 1972-08-15 | Stewarts & Lloyds Ltd | Expansible tools |
| FR2329401A1 (en) * | 1975-10-27 | 1977-05-27 | Socea | Aligning two pipes for butt welding, using expanding mandrel - to obtain smooth bore for pneumatic conveying of fragile goods |
| CN1060929A (en) * | 1990-09-17 | 1992-05-06 | 株式会社日立制作所 | Its manufacture method of structure and equipment with canister of the person in charge and arm |
| US5395142A (en) * | 1992-05-07 | 1995-03-07 | Hmc H. Meyer & Co. Spezialstahl Gmbh | Welding joint and backing sleeve therefore |
| JPH07214380A (en) * | 1994-02-02 | 1995-08-15 | Yokohama Rubber Co Ltd:The | Fixing jig for welding tube body |
| EP1207003B1 (en) * | 2000-11-17 | 2004-02-25 | Werner Jankus | Device for inner centering of tubes to be welded together |
| CN2924458Y (en) * | 2006-06-06 | 2007-07-18 | 刘军 | Tubular jacketed heat exchanger |
| CN202507016U (en) * | 2012-03-16 | 2012-10-31 | 贵州红湖发动机零部件有限公司 | Expanding and welding device for annular weld joints of sheet metal parts in automatic welding process |
| CN203076844U (en) * | 2013-01-28 | 2013-07-24 | 杭州国能汽轮工程有限公司 | Pipe opening automatic welding eccentric locating shaft sleeve |
| CN205309685U (en) * | 2015-12-14 | 2016-06-15 | 茂名重力石化机械制造有限公司 | It welds group to ware and clamp cover heat exchanger to press from both sides cover heat exchanger straight tube inner tube deep hole |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109732230A (en) * | 2018-12-29 | 2019-05-10 | 哈电集团（秦皇岛）重型装备有限公司 | A method of adapter tube welding |
| CN109773401A (en) * | 2019-03-27 | 2019-05-21 | 东北石油大学 | The rotary insertion expanding cushion device of pipeline welding |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 525024 Guangdong City, Maoming Province Ring West Road, No. 91 Applicant after: Maoming gravity Petrochemical Equipment Co Ltd Address before: 525024 Maoming City, Guangdong Province West Road, Maoming City, the gravity of the Petrochemical Machinery Manufacturing Co., Ltd., Applicant before: The Challenge Petrochemical Machinery Corporation |
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| COR | Change of bibliographic data | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160316 |
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| RJ01 | Rejection of invention patent application after publication |