CN103920769B - A kind of bending process of linear pattern heating furnace tube - Google Patents
A kind of bending process of linear pattern heating furnace tube Download PDFInfo
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- CN103920769B CN103920769B CN201410147465.XA CN201410147465A CN103920769B CN 103920769 B CN103920769 B CN 103920769B CN 201410147465 A CN201410147465 A CN 201410147465A CN 103920769 B CN103920769 B CN 103920769B
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Abstract
A kind of bending machining technique of linear pattern furnace tubing, it uses a kind of linear pattern furnace tubing bending apparatus, described linear pattern furnace tubing bending apparatus comprises left frame (13) and dipper crowding gear (10), dipper crowding gear (10) is in left frame (13) right, the rear portion, right side of described left frame (13) is fixedly connected with dovetail guide (15), dovetail guide (15) horizontal-extending in the lateral direction, the left end of dovetail guide (15) is fixedly connected with described left frame (13), dovetail groove in the right-hand member of dovetail guide (15) and the rear portion of dipper crowding gear (10) is slidably connected, the front portion of described left frame (13) is provided with the through hole passed for linear pattern furnace tubing, described dovetail guide (15) slides successively from left to right between described left frame (13) and dipper crowding gear (10) and is provided with three bending hydraulic means (9).
Description
Technical field
The application relates to the making of heating furnace tube, is specially a kind of linear heating furnace tube bending process.
Background technology
Heating furnace has a wide range of applications in the industry, such as heating steel billet, heat treatment of workpieces etc.In order to increase the heating uniformity of heating furnace, heating furnace tube is often in a bent form.
In the prior art, in order to ensure the requirement of concrete heating furnace shape and meet the requirement respectively of concrete heating heat, usually need to carry out the bending of concrete shape to the shape of boiler tube.Bending for heating furnace tube, often adopts stamping forming mode in the prior art.This molding mode efficiently can realize bending machining rapidly, and machining accuracy is high, and cost is lower, has extensive use in the prior art.But, this mode of heating easily produces significantly a large amount of inhomogeneous deformations on the longitudinal direction of heating furnace tube, the cross-sectional area of heating furnace tube is caused to have larger variation on the longitudinal direction of boiler tube, this makes heating uniformity in heating process be difficult to control, and, easily in the process used, produce uneven stress to concentrate, thus cause the stability in use of heating furnace, security greatly reduces, and shortens the service life of heating furnace.
Also have in the prior art and use bending to roll the scheme bent workpiece.But, this scheme often adopts curved bending one by one to workpiece, because the longitudinal size of workpiece is comparatively large, in the complete rotation process of workpiece, this processing often needs larger processing space, and, because process is adopt mode curved one by one, process is longer, and working (machining) efficiency is lower, cause processing cost to rise thus, and be difficult to the form accuracy ensureing processing.
Summary of the invention
A kind of heating furnace tube bending process of the present invention, it is intended to solve the defects such as machining deformation in prior art is uneven and process is long, form accuracy is low, and provides a kind of bending process with the heating furnace tube of concrete shape.
The technical solution used in the present invention is as follows:
A kind of bending machining technique of linear pattern furnace tubing, it uses a kind of linear pattern furnace tubing bending apparatus, described linear pattern furnace tubing bending apparatus comprises left frame and dipper crowding gear, dipper crowding gear is in left frame right, the rear portion, right side of described left frame is fixedly connected with dovetail guide, dovetail guide is horizontal-extending in the lateral direction, the left end of dovetail guide is fixedly connected with described left frame, dovetail groove in the right-hand member of dovetail guide and the rear portion of dipper crowding gear is slidably connected, and the front portion of described left frame is provided with the through hole passed for linear pattern furnace tubing; Described dovetail guide slides successively from left to right between described left frame and dipper crowding gear and is provided with three bending hydraulic means; The front portion, left side of dipper crowding gear is fixedly installed the first fixture, the right front of left frame is fixedly installed the second fixture, fromer rail is provided with between described left frame and dipper crowding gear, described fromer rail straight line between the second fixture and the first fixture extends, and when dipper crowding gear slides along described dovetail guide, the first fixture can slide along fromer rail towards the second fixture; Described fromer rail is also provided with the 3rd fixture and the 4th fixture slidably between the second fixture and the first fixture, four fixtures include clip base, rear fixture block and front fixture block, the described rear fixture block of each fixture and front fixture block are all relatively arranged along the fore-and-aft direction in the plane of bending when described linear pattern furnace tubing generation plain bending, and can realize contact gripping and be separated the action of unclamping in clip base; Wherein, described rear fixture block is all positioned at described fromer rail rear, and is rectangular shape, described front fixture block, is all positioned at described fromer rail front, and is cylindrical shape; The longitudinal axis of described rectangular shape and cylindrical shape is all perpendicular to plane of bending during described linear pattern furnace tubing generation plain bending.
Wherein, the right flank of the rear fixture block of described second fixture is provided with the right extension limited block extended to the right, the left surface of the rear fixture block of described first fixture is provided with the left extension limited block extended to the left, the left and right side of the rear fixture block of the 3rd fixture and the 4th fixture is provided with respectively the left extension limited block extended to the left and the right extension limited block extended to the right.
Each in described three bending hydraulic means includes driving hydraulic cylinder, and described driving hydraulic cylinder is arranged relative to the longitudinal axis orthogonal of dovetail guide, and can slide on dovetail guide; The hydraulic stem end of described driving hydraulic cylinder is hinged with bending roll, and drives hydraulic cylinder can drive bending roll applying bend pipe thrust forward along the direction vertical with dovetail guide; Each in described three bending hydraulic means all also comprises hoofing part mechanism, slides into diverse location in order to drive corresponding bending hydraulic means respectively along dovetail guide.
The right side of described dipper crowding gear is provided with support bar telescoping mechanism, support bar telescoping mechanism is arranged on the front of described dovetail guide, support bar telescoping mechanism has retractility support bar, retractility support bar can be used in extending in described linear pattern furnace tubing through the left side leaving dipper crowding gear from the right side of dipper crowding gear, thus play the effect supporting linear pattern furnace tubing and prevent the generation of linear pattern furnace tubing undesirably bending, and can move back and forth in the lateral direction under the driving of support bar telescoping mechanism.
Described bending machining technique comprises the steps:
A., linear pattern furnace tubing is provided;
B. described linear pattern furnace tubing penetrated a through hole on described left frame and advance to the right, until the length thereof that described linear pattern furnace tubing will carry out bending machining stretches out in described left frame;
C. the left end of described linear pattern furnace tubing clamps by described second fixture;
D. dipper crowding gear motion, to make the right-hand member of the first clamp linear pattern furnace tubing;
E. the 3rd fixture and the 4th fixture clamp linear pattern furnace tubing between the second fixture and the first fixture, and make the second fixture, the 3rd fixture, the 4th fixture and the first fixture the forearm of linear pattern furnace tubing is separated into three equal length sections of length;
F. each mid point making its bending roll contact corresponding each length section in described three length sections respectively in described three bending hydraulic means;
Retractility support bar stretches in the pipe of linear pattern furnace tubing by the support bar telescoping mechanism G. arranged on the right side of dipper crowding gear, and first length section from left to right stayed in described three length sections is not supported, from left to right second and the 3rd length section supported;
H. the bending roll of the bending hydraulic means in left side starts outwards top pressure first length section from left to right, thus it is bending to make it that linear occur, dipper crowding gear synchronously follows pushing along with bending carrying out, meanwhile, and the 3rd fixture, the also synchronously accompany movement of the 4th fixture; In the process of top pressure, the bending hydraulic means in left side to left movement, thus makes its bending roll keep corresponding to the position of first length section mid point from left to right under the driving of its hoofing part mechanism; When contacting to the right extension limited block of the first fixture and the left extension limited block of the 3rd fixture, the bending roll of the bending hydraulic means in described left side stops top pressure, and dipper crowding gear stops continuing urged forward; Dipper crowding gear stops continuing after urged forward, and dipper crowding gear keeps current pushing force horizontal stationary motionless minute, to carry out pressurize sizing to the part of bending forming;
I. retractility support bar bounces back by the support bar telescoping mechanism of dipper crowding gear, thus first length section from left to right making to stay in described three length sections and from left to right second length section are not all supported, and the 3rd length section is supported from left to right;
J. the bending hydraulic means in the middle of starts second length section from left to right described in the pressure of top, until the right extension limited block of the 3rd fixture contacts with the left extension limited block of the 4th fixture;
K. dipper crowding gear makes described retractility support bar bounce back completely, is not all supported to make three length sections;
L. the bending hydraulic means on right side starts the 3rd length section from left to right described in the pressure of top, until the right extension limited block of the 4th fixture contacts with the left extension limited block of the first fixture;
M. each fixture unclamps, and takes the linear pattern furnace tubing that bending machining is complete away;
N. linear pattern furnace tubing complete for bending machining is put into destressing heat-treatment furnace and carry out stress relief annealing, such as, the process conditions of annealing can be: holding temperature degree Celsius, temperature retention time hour.
Due in the present invention, each fixture have employed extension limited block, thus after limited block is contacted, a locking can be carried out to the boiler tube after shaping, under the effect of follow-up elaboration power, can not the curved shape after precise forming be impacted, and to have employed be cuboid while be columniform fixture, while making to ensure that enough clamping forces, level and smooth flexural deformation can be formed to the boiler tube be shaped again, whole process, while in longitudinal direction feeding, while utilize bending rolling work to carry out bending, therefore, to which obviate in prior art on the longitudinal direction of boiler tube process the problem that bending position produces larger linear deformation, and, in process, it adopts unique form processing, feeding on one side, bending roll carries out action and moves on parallel longitudinal direction direction in vertical longitudinal direction, thus keep the relative position relation of bending roll and institute's crooked position, and boiler tube is longitudinally sent under the moving integrally of other clamping devices, therefore, ensure that boiler tube entirety keeps longitudinal direction and bent one by one, whole BENDING PROCESS is continuous, without the need to repeating, clamping and dismounting are carried out to boiler tube, make whole process processing space little, process is short and ensure that the form accuracy of processing.And multiple fixture can slide in process, ensure that the locking all the time boiler tube in process to clamping position.
Accompanying drawing explanation
Fig. 1 is the schematic top plan view of bending apparatus of the present invention.
Fig. 2 is the schematic top plan view of bending apparatus after completing the crooking of the tubes in Fig. 1 of the present invention.
Fig. 3 is the schematic top plan view of the boiler tube shape after having bent.
Detailed description of the invention
Below in conjunction with accompanying drawing 1-3, the present invention is described in detail.
A kind of bending machining technique of linear pattern furnace tubing, it uses a kind of linear pattern furnace tubing bending apparatus, described linear pattern furnace tubing bending apparatus comprises left frame 13 and dipper crowding gear 10, dipper crowding gear 10 is in left frame 13 right, the rear portion, right side of described left frame 13 is fixedly connected with dovetail guide 15, dovetail guide 15 horizontal-extending in the lateral direction, the left end of dovetail guide 15 is fixedly connected with described left frame 13, dovetail groove in the right-hand member of dovetail guide 15 and the rear portion of dipper crowding gear 10 is slidably connected, the front portion of described left frame 13 is provided with the through hole passed for linear pattern furnace tubing, described dovetail guide 15 slides successively from left to right between described left frame 13 and dipper crowding gear 10 and is provided with three bending hydraulic means 9, the front portion, left side of dipper crowding gear 10 is fixedly installed the first fixture 1, the right front of left frame 13 is fixedly installed the second fixture 4, fromer rail is provided with between described left frame 13 and dipper crowding gear 10, described fromer rail straight line between the second fixture 4 and the first fixture 1 extends, and when dipper crowding gear 10 slides along described dovetail guide 15, the first fixture 1 can slide along fromer rail towards the second fixture 4, described fromer rail is also provided with the 3rd fixture 3 and the 4th fixture 2 slidably between the second fixture 4 and the first fixture 1, four fixtures 1,2,3,4 include clip base, rear fixture block 41 and front fixture block 42, the described rear fixture block 41 of each fixture and front fixture block 42 are all relatively arranged along the fore-and-aft direction in the plane of bending when described linear pattern furnace tubing generation plain bending, and can realize contact gripping and be separated the action of unclamping in clip base, wherein, described rear fixture block 41 is all positioned at described fromer rail rear, and is rectangular shape, and described front fixture block 42 is all positioned at described fromer rail front, and is cylindrical shape, the longitudinal axis of described rectangular shape and cylindrical shape is all perpendicular to plane of bending during described linear pattern furnace tubing generation plain bending.
Wherein, the right flank of the rear fixture block of described second fixture 4 is provided with the right extension limited block 43 extended to the right, the left and right side left surface of the rear fixture block of described first fixture 1 being provided with the rear fixture block of left extension limited block the 14, three fixture 3 and the 4th fixture 2 extended to the left is provided with the left extension limited block extended to the left and the right extension limited block extended to the right respectively.
Each in described three bending hydraulic means 9 includes driving hydraulic cylinder, and described driving hydraulic cylinder is arranged relative to the longitudinal axis orthogonal of dovetail guide 15, and can slide on dovetail guide 15; The hydraulic stem end of described driving hydraulic cylinder is hinged with bending roll 91, and drives hydraulic cylinder can drive the bend pipe thrust applying forward to bending roll 91 along the direction vertical with dovetail guide 15; Each in described three bending hydraulic means 9 all also comprises hoofing part mechanism, slides into diverse location in order to drive corresponding bending hydraulic means 9 respectively along dovetail guide 15.
The right side of described dipper crowding gear 10 is provided with support bar telescoping mechanism 12, support bar telescoping mechanism 12 is arranged on the front of described dovetail guide 15, support bar telescoping mechanism 12 has retractility support bar 120, retractility support bar 120 can be used in extending in described linear pattern furnace tubing through the left side leaving dipper crowding gear 10 from the right side of dipper crowding gear 10, thus play the effect supporting linear pattern furnace tubing and prevent the generation of linear pattern furnace tubing undesirably bending, and can move back and forth in the lateral direction under the driving of support bar telescoping mechanism 12.
Described bending machining technique comprises the steps:
A., linear pattern furnace tubing is provided;
B. described linear pattern furnace tubing penetrated a through hole on described left frame 13 and advance to the right, until the length thereof that described linear pattern furnace tubing will carry out bending machining stretches out in described left frame 13;
C. the left end of described linear pattern furnace tubing clamps by described second fixture 4;
D. dipper crowding gear 10 moves, with the right-hand member making the first fixture 1 clamp linear pattern furnace tubing;
E. the 3rd fixture 3 and the 4th fixture 2 clamp linear pattern furnace tubing between the second fixture 4 and the first fixture 1, and make the second fixture 4, the 3rd fixture 3, the 4th fixture 2 and the first fixture 1 forearm of linear pattern furnace tubing is separated into three equal length sections of length;
F. each mid point making its bending roll 91 contact corresponding each length section in described three length sections respectively in described three bending hydraulic means 9;
Retractility support bar 120 stretches in the pipe of linear pattern furnace tubing by the support bar telescoping mechanism 12 G. arranged on the right side of dipper crowding gear 10, and first length section from left to right stayed in described three length sections is not supported, from left to right second and the 3rd length section supported;
H. the bending roll of the bending hydraulic means 9 in left side starts outwards top pressure first length section from left to right, thus it is bending to make it that linear occur, dipper crowding gear 10 synchronously follows pushing along with bending carrying out, meanwhile, and the 3rd fixture 3, the also synchronously accompany movement of the 4th fixture 2; In the process of top pressure, the bending hydraulic means 9 in left side to left movement, thus makes its bending roll keep corresponding to the position of first length section mid point from left to right under the driving of its hoofing part mechanism; When contacting to the right extension limited block 43 of the first fixture 4 and the left extension limited block of the 3rd fixture 3, the bending roll of the bending hydraulic means 9 in described left side stops top pressure, and dipper crowding gear 10 stops continuing urged forward; Dipper crowding gear 10 stops continuing after urged forward, and dipper crowding gear 10 keeps current pushing force horizontal stationary motionless 10 minutes, to carry out pressurize sizing to the part of bending forming;
I. retractility support bar 120 bounces back by the support bar telescoping mechanism 12 of dipper crowding gear 10, thus first length section from left to right making to stay in described three length sections and from left to right second length section are not all supported, and the 3rd length section is supported from left to right;
J. the bending hydraulic means 9 in the middle of starts second length section from left to right described in the pressure of top, until the right extension limited block of the 3rd fixture 3 contacts with the left extension limited block of the 4th fixture 2;
K. dipper crowding gear 10 makes described retractility support bar 120 bounce back completely, is not all supported to make three length sections;
L. the bending hydraulic means 9 on right side starts the 3rd length section from left to right described in the pressure of top, until the right extension limited block of the 4th fixture 2 contacts with the left extension limited block of the first fixture 1;
M. each fixture unclamps, and takes the linear pattern furnace tubing that bending machining is complete away;
N. linear pattern furnace tubing complete for bending machining is put into destressing heat-treatment furnace and carry out stress relief annealing, such as, the process conditions of annealing can be: holding temperature 300 degrees Celsius, temperature retention time 3 hours.
Claims (1)
1. the bending machining technique of a linear pattern furnace tubing, it uses a kind of linear pattern furnace tubing bending apparatus, described linear pattern furnace tubing bending apparatus comprises left frame (13) and dipper crowding gear (10), dipper crowding gear (10) is in left frame (13) right, the rear portion, right side of described left frame (13) is fixedly connected with dovetail guide (15), dovetail guide (15) horizontal-extending in the lateral direction, the left end of dovetail guide (15) is fixedly connected with described left frame (13), dovetail groove in the right-hand member of dovetail guide (15) and the rear portion of dipper crowding gear (10) is slidably connected, the front portion of described left frame (13) is provided with the through hole passed for linear pattern furnace tubing, described dovetail guide (15) slides successively from left to right between described left frame (13) and dipper crowding gear (10) and is provided with three bending hydraulic means (9), the front portion, left side of dipper crowding gear (10) is fixedly installed the first fixture (1), the right front of left frame (13) is fixedly installed the second fixture (4), fromer rail is provided with between described left frame (13) and dipper crowding gear (10), described fromer rail straight line between the second fixture (4) and the first fixture (1) extends, and when dipper crowding gear (10) slides along described dovetail guide (15), the first fixture (1) can slide along fromer rail towards the second fixture (4), described fromer rail is also provided with between the second fixture (4) and the first fixture (1) the 3rd fixture (3) and the 4th fixture (2) slidably, four fixtures (1,2,3,4) include clip base, rear fixture block (41) and front fixture block (42), the described rear fixture block (41) of each fixture and front fixture block (42) are all relatively arranged along the fore-and-aft direction in the plane of bending when described linear pattern furnace tubing generation plain bending, and can realize contact gripping and be separated the action of unclamping in clip base, wherein, described rear fixture block (41) is all positioned at described fromer rail rear, and is rectangular shape, and described front fixture block (42) is all positioned at described fromer rail front, and is cylindrical shape, the longitudinal axis of described rectangular shape and cylindrical shape is all perpendicular to plane of bending during described linear pattern furnace tubing generation plain bending,
Wherein, the right flank of the rear fixture block of described second fixture (4) is provided with the right extension limited block (43) extended to the right, the left surface of the rear fixture block of described first fixture (1) is provided with the left extension limited block (14) extended to the left, the left and right side of the rear fixture block of the 3rd fixture (3) and the 4th fixture (2) is provided with respectively the left extension limited block extended to the left and the right extension limited block extended to the right;
Each in described three bending hydraulic means (9) includes driving hydraulic cylinder, and described driving hydraulic cylinder is arranged relative to the longitudinal axis orthogonal of dovetail guide (15), and can slide dovetail guide (15) is upper; The hydraulic stem end of described driving hydraulic cylinder is hinged with bending roll (91), and drives hydraulic cylinder can drive the bend pipe thrust applying forward to bending roll (91) along the direction vertical with dovetail guide (15); Each in described three bending hydraulic means (9) all also comprises hoofing part mechanism, slides into diverse location in order to drive corresponding bending hydraulic means (9) respectively along dovetail guide (15);
The right side of described dipper crowding gear (10) is provided with support bar telescoping mechanism (12), support bar telescoping mechanism (12) is arranged on the front of described dovetail guide (15), support bar telescoping mechanism (12) has retractility support bar (120), retractility support bar (120) can be used in extending in described linear pattern furnace tubing through the left side leaving dipper crowding gear (10) from the right side of dipper crowding gear (10), thus play the effect supporting linear pattern furnace tubing and prevent the generation of linear pattern furnace tubing undesirably bending, and can move back and forth in the lateral direction under the driving of support bar telescoping mechanism (12),
Described bending machining technique comprises the steps:
A., linear pattern furnace tubing is provided;
B. described linear pattern furnace tubing penetrated a through hole on described left frame (13) and advance to the right, until the length thereof that described linear pattern furnace tubing will carry out bending machining stretches out in described left frame (13);
C. the left end of described linear pattern furnace tubing clamps by described second fixture (4);
D. dipper crowding gear (10) motion, with the right-hand member making the first fixture (1) clamp linear pattern furnace tubing;
E. the 3rd fixture (3) and the 4th fixture (2) clamp linear pattern furnace tubing between the second fixture (4) and the first fixture (1), and make the second fixture (4), the 3rd fixture (3), the 4th fixture (2) and the first fixture (1) forearm of linear pattern furnace tubing is separated into three equal length sections of length;
F. each mid point making its bending roll (91) contact corresponding each length section in described three length sections respectively in described three bending hydraulic means (9);
Retractility support bar (120) stretches in the pipe of linear pattern furnace tubing by the support bar telescoping mechanism (12) that G. dipper crowding gear (10) right side is arranged, and first length section from left to right stayed in described three length sections is not supported, from left to right second and the 3rd length section supported;
H. the bending roll of the bending hydraulic means (9) in left side starts outwards top pressure first length section from left to right, thus it is bending to make it that linear occur, dipper crowding gear (10) synchronously follows pushing along with bending carrying out, meanwhile, the 3rd fixture (3), the 4th fixture (2) also synchronously accompany movement; In the process of top pressure, the bending hydraulic means (9) in left side to left movement, thus makes its bending roll keep corresponding to the position of first length section mid point from left to right under the driving of its hoofing part mechanism; When right extension limited block (43) to the first fixture (4) contacts with the left extension limited block of the 3rd fixture (3), the bending roll of the bending hydraulic means (9) in described left side stops top pressure, and dipper crowding gear (10) stops continuing urged forward; Dipper crowding gear (10) stops continuing after urged forward, and dipper crowding gear (10) keeps current pushing force horizontal stationary motionless 10 minutes, to carry out pressurize sizing to the part of bending forming;
I. retractility support bar (120) bounces back by the support bar telescoping mechanism (12) of dipper crowding gear (10), thus first length section from left to right making to stay in described three length sections and from left to right second length section are not all supported, the 3rd length section is supported from left to right;
J. the bending hydraulic means (9) in the middle of starts second length section from left to right described in the pressure of top, until the right extension limited block of the 3rd fixture (3) contacts with the left extension limited block of the 4th fixture (2);
K. dipper crowding gear (10) makes described retractility support bar (120) bounce back completely, is not all supported to make three length sections;
L. the bending hydraulic means (9) on right side starts the 3rd length section from left to right described in the pressure of top, until the right extension limited block of the 4th fixture (2) contacts with the left extension limited block of the first fixture (1);
M. each fixture unclamps, and takes the linear pattern furnace tubing that bending machining is complete away;
N. linear pattern furnace tubing complete for bending machining is put into destressing heat-treatment furnace and carry out stress relief annealing, such as, the process conditions of annealing can be: holding temperature 300 degrees Celsius, temperature retention time 3 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410147465.XA CN103920769B (en) | 2014-04-14 | 2014-04-14 | A kind of bending process of linear pattern heating furnace tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410147465.XA CN103920769B (en) | 2014-04-14 | 2014-04-14 | A kind of bending process of linear pattern heating furnace tube |
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| CN103920769A CN103920769A (en) | 2014-07-16 |
| CN103920769B true CN103920769B (en) | 2016-01-20 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3475938A (en) * | 1967-05-02 | 1969-11-04 | Foster Wheeler Corp | Apparatus for bending |
| DE4129478A1 (en) * | 1991-09-05 | 1993-03-11 | Schwarze Rigobert | METHOD FOR CONTROLLING A PIPE BENDING MACHINE |
| US5379624A (en) * | 1993-11-22 | 1995-01-10 | Burr Oak Tool & Gauge Company | Slaved tube length control for hairpin bender |
| CN201751032U (en) * | 2010-06-23 | 2011-02-23 | 浙江嘉兴亚达不锈钢制造有限公司 | Pipe bending machine |
| JP5707146B2 (en) * | 2011-01-22 | 2015-04-22 | 三桜工業株式会社 | Pipe bending machine |
| CN102825118A (en) * | 2011-06-19 | 2012-12-19 | 江苏亚光金属制品有限公司 | Machine for bending pipe for evaporator into 9 shape |
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Effective date of registration: 20160511 Address after: 301712, No. 8, unit 2, building 201, Longgang Li, Chengguan Town, Tianjin, Jixian County Patentee after: Liu Hongguang Address before: 311817 Zhuji City, Zhejiang province should shop Street Town Shop Street Village Town, Changxin Road, No. 8, No. Patentee before: Fang Xiaogang |
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Inventor after: Liu Hongguang Inventor before: Fang Xiaogang |
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