CN106216462B - Double-layer pipe bending machining method - Google Patents
Double-layer pipe bending machining method Download PDFInfo
- Publication number
- CN106216462B CN106216462B CN201610781627.4A CN201610781627A CN106216462B CN 106216462 B CN106216462 B CN 106216462B CN 201610781627 A CN201610781627 A CN 201610781627A CN 106216462 B CN106216462 B CN 106216462B
- Authority
- CN
- China
- Prior art keywords
- tube
- inner tube
- end cap
- double
- outer tube
- 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.)
- Active
Links
Classifications
-
- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/08—Bending tubes using mandrels or the like in press brakes or between rams and anvils or abutments; Pliers with forming dies
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
-
- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
-
- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/16—Auxiliary equipment, e.g. machines for filling tubes with sand
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Disclosed is a double-layer pipe bending machining technology. A supporting spring is placed in an inner pipe, the inner pipe is inserted into an outer pipe, one end of the inner pipe and one end of the outer pipe are sealed and positioned, and a first end cover is arranged; the gap between the two pipes is filled with a metal ball from the other end of the inner pipe and the other end of the outer pipe, sealing and positioning are carried out, and a second end cover is arranged; an injection hole of the first end cover or the second end cover is connected with a liquid inlet pipe through a pressurizing valve, and a pressure relieving valve is arranged on the injection hole of the second end cover or the first end cover; the pressure relieving valve is closed, lubricating liquid is injected into the gap between the inner pipe and the outer pipe and the inner pipe, and a double-layer pipe fitting to be bent is formed; the lower portions of two ends of the double-layer pipe fitting are supported on two symmetrically-arranged supporting bases; pressure is exerted to the middle of the upper portion of the double-layer pipe fitting until the double-layer pipe fitting is bent to the set angle; the first end cover, the second end cover, a first seal rubber ring and a second rubber seal ring are unloaded, the metal ball and the supporting spring are recycled, and a finished product is finished. The bending quality is ensured.
Description
Technical field
The present invention relates to a kind of elbow pipe processing technology.More particularly to a kind of bimetallic tube for pipe bending molding bends
Processing technique.
Background technology
Bend pipe is the vitals of industrial equipment, for the forged pipeline for processing, it usually needs by bending to
Obtaining arc, conventional method is to use bending machine to the processing method of type.In some special dimensions, such as industry cooling, oil
Conveying etc., puts forward higher requirement to pipeline, and monolayer pipeline can not meet needs.Existing pipe bending processing technique is main
Have：Push away it is curved, bend and the method such as go for a stroll, all there is larger ovality in the bend pipe processed by these methods and wall thickness is thinning etc.
Problem.In above-mentioned bending machining technique, generally using the method for adding plug, but the method has such as plug to remove is stranded
The shortcomings of hardly possible, high processing costs.For double-deck tube-in-tube, the deformation of inner tube in BENDING PROCESS is difficult observation, if
Deformation is excessive or even causes Local Cracking, has a strong impact on normally using for pipeline.
The content of the invention
The technical problem to be solved is to provide a kind of bimetallic tube bending for being able to ensure that bimetallic tube bending quality
Processing technique.
The technical solution adopted in the present invention is：A kind of bimetallic tube bending machining technique, comprises the steps：
1) outer tube blanking；
2) inner tube blanking, and make inner tube and outer tube equal length；
3) support spring is placed in inner tube；
4) inner tube is inserted in outer tube, and carries out sealing fixed by the first sealing rubber ring in one end of inner and outer tubes
Position, adds a cover the first end cap；
5) other end from inner and outer tubes is to the gap filler metal ball between inner and outer tubes, and seals by second
Rubber ring carries out sealing positioning, adds a cover the second end cap；
6) feed tube is connected by pressurizing valve on the hand-hole of the first end cap or the second end cap, in the second end cap or first
Pressure-relief valve is provided with the hand-hole of end cap；
7) pressure-relief valve is closed, lubrication is injected in the gap between inner and outer tubes and inner tube by feed tube pressurizing valve
Liquid, constitutes double-deck pipe fitting to be bent；
8) the two ends bottom of double-deck pipe fitting is supported on respectively in symmetrically placed two support base；
9) pressure is applied to double-deck pipe fitting by the forcing press with pressure head in the middle of double-deck pipe fitting top, until bimetallic tube
Part bends to set angle；
10) pressurizing valve is closed, opens pressure-relief valve and reclaim lubricating fluid；
11) the first end cap and the second end cap and the first sealing rubber ring and the second sealing rubber ring are unloaded, metal is reclaimed
Ball and support spring, complete finished product.
Described the first end cap and the second end cover structure is identical, includes the interior spiral shell being threadedly coupled with the outer tube
Stricture of vagina, is formed in the hand-hole of end cap end face center, is formed in the annular diversion trench of end cap top surface periphery, be connected to hand-hole and
Guiding gutter between annular diversion trench, the guiding gutter at least provided with 4, the hand-hole, guiding gutter and annular diversion trench
It is interconnected；First sealing rubber ring and the second caulking gum coil structures are identical, include sealing rubber ring circle body and
At least 4 through holes being axially formed on the sealing rubber ring circle body, one end of the through hole and the annular water conservancy diversion
Groove is connected, and the gap between the other end and described inner and outer tubes is connected.
In step 9) carry out during, by the gap between inner and outer tubes and inner tube by constant pressure pump it is equal
Even injection lubricating fluid, makes to keep constant pressure in gap and the inner tube between inner and outer tubes automatically.
Step 3) described in the external diameter size of support spring to meet support spring and contact with the inwall of said inner tube, institute
The length for stating support spring is equal with inner tube length.
Step 5) described in metal ball diameter less than 1/3rd of the spacing between inner and outer tubes.
Step 9) described in the size of pressure head be to be selected according to the different external diameters of bilayer pipe fittings and the angle of bending.
Step 8) described in support base and described double-deck pipe fitting be curved face contact.
A kind of bimetallic tube bending machining technique of the present invention, realizes the processing of bimetallic tube bending, process is simple.The present invention
Cold bend(ing) molding is used, the phenomenon that metal grain changes in thermal flexure forming process is effectively prevent, it is ensured that bending matter
Amount；Charger and mould structure are simple, are easily installed, also replaceable different pressure head, process the bend pipe of different curved footpath ratios；By
In being mounted with that spring and bead ensure that the effective support to tube wall, and the part that constant pressure in pipe limits inner and outer pipes is kept to become
Shape so that satisfied distance is kept between the inner and outer pipes after bending, it is to avoid cause pipe diameter to contract because producing moderate finite deformation
Little or cracking, gives full play to effect of bimetallic tube；Brake forming terminates rear release, reclaims lubricating fluid, and by the bullet in inner tube
Metal ball between spring and inner and outer pipes is taken out, and is reused, and changing different pressure heads can process the bend pipe of different curved footpath ratios.
Description of the drawings
Fig. 1 is a kind of side structure schematic diagram of bimetallic tube bending machining process structure of the invention；
Fig. 2 is the B-B sectional views of Fig. 1；
Fig. 3 is a kind of three-dimensional exploded schematic diagram of bimetallic tube bending machining process structure of the invention；
Fig. 4 is the structural representation of the end cap used in a kind of bimetallic tube bending machining technique of the invention.
In figure
1：Pressure head 2：Metal ball
31：First end cap 32：Second end cap
33：Female thread 34：Annular diversion trench
35：Hand-hole 36：Annular diversion trench
4：Pressurizing valve 5：Feed tube
61：First sealing rubber ring 62：Second sealing rubber ring
63：Through hole 7：Screw
8：Support base 9：Support spring
10：Outer tube 11：Inner tube
12：Pressure-relief valve
Specific embodiment
A kind of bimetallic tube bending machining technique of the present invention is described in detail with reference to embodiment and accompanying drawing.
A kind of bimetallic tube bending machining technique of the present invention, relates generally to double-deck tube-in-tube bending, processing technique
Using cold bend(ing) moulding process, special spring is installed in the inner tube of double-deck pipe to be bent, the diameter of spring is slightly less than inner tube
Internal diameter and contact inwall, the length of spring is identical with double-deck pipe length；Special metal ball is filled between inner and outer pipes, diameter is remote
Less than inside and outside ligament；Inner tube and double-deck ligament fill automatic constant-pressure lubricating fluid, pipe closed at both ends.Pipe is fixed on
On special mould, pressure is applied to pipe by loading equipemtn, bending to for bimetallic tube is completed using cold bend(ing) moulding process
Type.
A kind of bimetallic tube bending machining technique of the present invention, as shown in Figure 1 and Figure 2, comprises the steps：
1) blanking of outer tube 10；
2) blanking of inner tube 11, and make inner tube 11 and the equal length of outer tube 10；
3) place support spring 9 in inner tube 11, the external diameter size of described support spring 9 to meet support spring 9 with
The inwall of said inner tube 11 contacts, length and the equal length of inner tube 11 of the support spring 9；
4) inner tube 11 is inserted in outer tube 10, and is entered by the first sealing rubber ring 61 in one end of inner tube 11 and outer tube 10
Row sealing positioning, adds a cover the first end cap 31；
5) it is described from the other end of inner tube 11 and outer tube 10 to the gap filler metal ball 2 between inner tube 11 and outer tube 10
Metal ball 2 diameter less than 1/3rd of spacing between inner tube 11 and outer tube 10, and by the second sealing rubber ring 62
Sealing positioning is carried out, the second end cap 32 is added a cover；
The first described end cap 31 is identical with the structure of the second end cap 32, includes and is threadedly coupled with the outer tube 10
Female thread 33, be formed in the hand-hole 35 of end cap end face center, be formed in the annular diversion trench 36 of end cap top surface periphery, connect
Guiding gutter 36 between hand-hole 35 and annular diversion trench 34, the guiding gutter 36 at least provided with 4, the hand-hole
35th, guiding gutter 36 and annular diversion trench 34 are interconnected；The structure of first sealing rubber ring, 61 and second sealing rubber ring 62
It is identical, sealing rubber ring circle body and at least 4 through holes 63 being axially formed on the sealing rubber ring circle body are included,
One end of the through hole 63 is connected with the annular diversion trench 36, between the other end and described inner tube 11 and outer tube 10
Gap is connected.
6) feed tube 5 is connected by pressurizing valve 4 on the hand-hole 35 of the first end cap 31 or the second end cap 32, at the second end
Pressure-relief valve 12 is provided with the hand-hole 35 of the end cap 31 of lid 32 or first；
7) pressure-relief valve 12 is closed, by the pressurizing valve 4 of feed tube 5 to the gap between inner tube 11 and outer tube 10 and inner tube 11
Middle injection lubricating fluid, constitutes double-deck pipe fitting to be bent；
8) the two ends bottom of double-deck pipe fitting is supported on respectively in symmetrically placed two support base 8, described props up
Support base 8 is curved face contact with described double-deck pipe fitting, also, described support base 8 is to be fixed on forcing press by screw 7
On；
9) pressure is applied to double-deck pipe fitting by the forcing press with pressure head 1 in the middle of double-deck pipe fitting top, until double-deck
Pipe fitting bends to set angle, and the size of described pressure head 1 is carried out according to the different external diameters of bilayer pipe fitting and the angle of bending
Select.During carrying out, by uniform by constant pressure pump in the gap between inner tube 11 and outer tube 10 and inner tube 11
Injection lubricating fluid, makes to keep constant pressure in gap and the inner tube 11 between inner tube 11 and outer tube 10 automatically；
10) pressurizing valve 4 is closed, opens pressure-relief valve 12 and reclaim lubricating fluid；
11) the first end cap 31 and the second end cap 32 and the first sealing rubber ring 61 and the second sealing rubber ring 62 are unloaded,
Metal ball 2 and support spring 9 are reclaimed, finished product is completed.
The above, the preferred embodiment of a kind of bimetallic tube bending machining technique only of the invention, it is impossible to this patent
Technology category does any restriction, the displacement of all any components done to above-described embodiment according to this patent protection domain, trickle
Modification, equivalent variations and modification, still fall within the scope that this patent is covered.
Claims (5)
1. a kind of bimetallic tube bend processing method, it is characterised in that comprise the steps：
1) outer tube (10) blanking；
2) inner tube (11) blanking, and make inner tube (11) and outer tube (10) equal length；
3) support spring (9) is placed in inner tube (11)；
4) it is inner tube (11) insertion outer tube (10) is interior, and pass through the first sealing rubber ring in one end of inner tube (11) and outer tube (10)
(61) sealing positioning is carried out, adds a cover the first end cap (31)；
5) other end from inner tube (11) and outer tube (10) is to the gap filler metal ball between inner tube (11) and outer tube (10)
(2), and by the second sealing rubber ring (62) carry out sealing positioning, add a cover the second end cap (32), described metal ball (2) it is straight
Footpath is less than 1/3rd of the spacing between inner tube (11) and outer tube (10)；
6) feed tube (5) is connected by pressurizing valve (4) on the hand-hole (35) of the first end cap (31) or the second end cap (32),
Pressure-relief valve (12) is provided with the hand-hole (35) of the second end cap (32) or the first end cap (31)；
7) close pressure-relief valve (12), by feed tube (5) pressurizing valve (4) to the gap between inner tube (11) and outer tube (10) and
Injection lubricating fluid in inner tube (11), constitutes double-deck pipe fitting to be bent；
8) the two ends bottom of double-deck pipe fitting is supported on respectively on symmetrically placed two support base (8)；
9) pressure is applied to double-deck pipe fitting by the forcing press with pressure head (1) in the middle of double-deck pipe fitting top, until bimetallic tube
Part bends to set angle；
10) pressurizing valve (4) is closed, opens pressure-relief valve (12) and reclaim lubricating fluid；
11) the first end cap (31) and the second end cap (32) and the first sealing rubber ring (61) and the second sealing rubber ring are unloaded
(62), metal ball (2) and support spring (9) are reclaimed, completes finished product；
Described the first end cap (31) is identical with the second end cap (32) structure, and include carries out screw thread company with the outer tube (10)
The female thread (33) for connecing, is formed in the hand-hole (35) of end cap end face center, is formed in the annular diversion trench of end cap top surface periphery
(36) guiding gutter (36), being connected between hand-hole (35) and annular diversion trench (34), the guiding gutter (36) at least provided with
There are 4, the hand-hole (35), guiding gutter (36) and annular diversion trench (34) are interconnected；First sealing rubber ring
(61) it is identical with the second sealing rubber ring (62) structure, include sealing rubber ring circle body and be axially formed at the sealing rubber
At least 4 through holes (63) on cushion rubber circle body, one end of the through hole (63) is connected with the annular diversion trench (36),
Gap between the other end and described inner tube (11) and outer tube (10) is connected.
2. a kind of bimetallic tube bend processing method according to claim 1, it is characterised in that in step 9) process that carries out
In, by being uniformly injected into lubricating fluid by constant pressure pump in the gap between inner tube (11) and outer tube (10) and inner tube (11),
Make to keep constant pressure in gap and the inner tube (11) between inner tube (11) and outer tube (10) automatically.
3. a kind of bimetallic tube bend processing method according to claim 1, it is characterised in that step 3) described in support bullet
The external diameter size of spring (9) will meet support spring (9) and contact with the inwall of said inner tube (11), the support spring (9)
Length and inner tube (11) equal length.
4. a kind of bimetallic tube bend processing method according to claim 1, it is characterised in that step 9) described in pressure head
(1) size is selected according to the different external diameters of bilayer pipe fitting and the angle of bending.
5. a kind of bimetallic tube bend processing method according to claim 1, it is characterised in that step 8) described in support bottom
Seat (8) is curved face contact with described double-deck pipe fitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610781627.4A CN106216462B (en) | 2016-08-31 | 2016-08-31 | Double-layer pipe bending machining method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610781627.4A CN106216462B (en) | 2016-08-31 | 2016-08-31 | Double-layer pipe bending machining method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106216462A CN106216462A (en) | 2016-12-14 |
| CN106216462B true CN106216462B (en) | 2017-05-03 |
Family
ID=58072310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610781627.4A Active CN106216462B (en) | 2016-08-31 | 2016-08-31 | Double-layer pipe bending machining method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106216462B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108620466B (en) * | 2018-04-24 | 2020-01-21 | 西北工业大学 | Double-layer pipe numerical control bending die and forming method thereof |
| CN110576090B (en) * | 2019-08-26 | 2020-11-27 | 四川航天长征装备制造有限公司 | Pipe orifice sealing device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1343874A (en) * | 2000-09-14 | 2002-04-10 | 安德雷斯和霍瑟·弗罗泰克有限公司 | Method for bend measuring tube |
| JP2002155744A (en) * | 2000-11-17 | 2002-05-31 | Comco Corp | Method and device for bending double tube |
| CN1583311A (en) * | 2003-08-21 | 2005-02-23 | 张家港市合丰机械制造有限公司 | Double-layer pipe bending method |
| EP1704001A1 (en) * | 2003-12-09 | 2006-09-27 | DaimlerChrysler AG | Bent double-walled component, such as an exhaust pipe insulated by an air gap, and method for producing the same |
| CN101804429A (en) * | 2010-03-26 | 2010-08-18 | 东莞市旗丰消声器有限公司 | Bending process of double-layer pipe |
| CN102962304A (en) * | 2012-12-07 | 2013-03-13 | 哈尔滨工业大学 | Liquid filling shearing bending formation method for small bending radius rectangular tube |
| CN103691762A (en) * | 2013-12-24 | 2014-04-02 | 南京航空航天大学 | Complicated-shape double-layer pipe manufacturing method and sealing device |
| CN205110467U (en) * | 2015-09-18 | 2016-03-30 | 重庆金仑机械制造有限责任公司 | Husky filling structure is irritated to double tube |
-
2016
- 2016-08-31 CN CN201610781627.4A patent/CN106216462B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1343874A (en) * | 2000-09-14 | 2002-04-10 | 安德雷斯和霍瑟·弗罗泰克有限公司 | Method for bend measuring tube |
| JP2002155744A (en) * | 2000-11-17 | 2002-05-31 | Comco Corp | Method and device for bending double tube |
| CN1583311A (en) * | 2003-08-21 | 2005-02-23 | 张家港市合丰机械制造有限公司 | Double-layer pipe bending method |
| EP1704001A1 (en) * | 2003-12-09 | 2006-09-27 | DaimlerChrysler AG | Bent double-walled component, such as an exhaust pipe insulated by an air gap, and method for producing the same |
| CN101804429A (en) * | 2010-03-26 | 2010-08-18 | 东莞市旗丰消声器有限公司 | Bending process of double-layer pipe |
| CN102962304A (en) * | 2012-12-07 | 2013-03-13 | 哈尔滨工业大学 | Liquid filling shearing bending formation method for small bending radius rectangular tube |
| CN103691762A (en) * | 2013-12-24 | 2014-04-02 | 南京航空航天大学 | Complicated-shape double-layer pipe manufacturing method and sealing device |
| CN205110467U (en) * | 2015-09-18 | 2016-03-30 | 重庆金仑机械制造有限责任公司 | Husky filling structure is irritated to double tube |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106216462A (en) | 2016-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106216462B (en) | Double-layer pipe bending machining method | |
| US4316870A (en) | Plastic tube, coupling, and method of forming same | |
| US3343250A (en) | Multiple tube forming method | |
| CN102327946B (en) | Manufacture the method for valve chest | |
| CN104607512B (en) | Bend forming method of large-angle pipeline with high precision, large pipe diameter and small bending diameter ratio | |
| CN102554009A (en) | Fluid pressure forming method for small-radius elbow | |
| JP6473198B2 (en) | Metal bellows tube forming method provided with liquid amount adjusting mechanism and forming apparatus therefor | |
| CN103920765B (en) | Thin metallic tubd pushes away o ing method | |
| CN101972791B (en) | Thin-wall stainless steel tee tube cold pressing molding device and molding method thereof | |
| CN106767094B (en) | A kind of bumps fourth born of the same parents' heat-transfer pipe extrusion forming device | |
| CN106493213B (en) | The manufacture device and method of a kind of pipeline | |
| CN105290177A (en) | Hot bending forming technology of large-caliber thick-walled pipe filled with sand cores through heat in supplementing manner | |
| CN107671486A (en) | A kind of fluid delivery tube clamping device | |
| CN116422783A (en) | Surface quality control method for heat exchange tube during hydraulic expansion connection of tube and tube plates of nuclear power heat exchanger | |
| CN109604436A (en) | The manufacturing process of liquid rocket engine thrust chamber body portion variable cross-section abnormity single tube | |
| CN109396763A (en) | A kind of novel all-in-one axle housing processing technology | |
| US2907102A (en) | Cold tube bending | |
| US2175575A (en) | Composite pipe connector and method of producing same | |
| CN107486488A (en) | Metal plate material hydraulic shaping method and its die device | |
| CN203592031U (en) | Flexible cold-bending hydraulic core rod | |
| CN105674564A (en) | Spirally-welded water tank liner and manufacture method thereof | |
| CN102139148A (en) | Treadmill roller and roller manufacturing method | |
| CN207065086U (en) | A kind of low temperature gas returning port on vehicle-mounted LNG gas cylinders | |
| WO2009004433A2 (en) | Method for obtaining a sealing junction for a rigid pipe intended to convey fluid under pressure | |
| CN111495996B (en) | Liquid-filling drawing device and method for miniature thin-wall metal pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 300350 District, Jinnan District, Tianjin Haihe Education Park, 135 beautiful road, Beiyang campus of Tianjin University Patentee after: Tianjin University Address before: 300072 Tianjin City, Nankai District Wei Jin Road No. 92 Patentee before: Tianjin University |
|
| CP02 | Change in the address of a patent holder |