CN113070357B - Speed regulation control method for wire drawing machine - Google Patents
Speed regulation control method for wire drawing machine Download PDFInfo
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- CN113070357B CN113070357B CN202110311980.7A CN202110311980A CN113070357B CN 113070357 B CN113070357 B CN 113070357B CN 202110311980 A CN202110311980 A CN 202110311980A CN 113070357 B CN113070357 B CN 113070357B
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- winding drum
- turns
- winding
- loose pulley
- position sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
- B21C1/12—Regulating or controlling speed of drawing drums, e.g. to influence tension; Drives; Stop or relief mechanisms
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention provides a speed regulation control method of a wire drawing machine, which comprises the following steps: s1, arranging two position sensors around a winding drum of a wire drawing machine, wherein the two position sensors correspond to the moving track of an upstream wheel on the winding drum in the circumferential direction; the two position sensors are electrically connected with a controller, and the controller is electrically connected with a motor of the winding drum; s2, two position sensors detect the position change of the loose pulley in the circumferential direction, detect signals are transmitted to the controller, the controller judges the rotation direction of the loose pulley according to the received signals, judges the winding or unwinding state of the winding drum according to the relation between the rotation direction of the loose pulley and the rotation direction of the winding drum, and controls the rotating speed of the motor through a control frequency converter according to the judgment result so as to adjust the rotating speed of the winding drum. The speed regulation method is simple, and can well ensure that the number of winding turns of the welding wire on the winding drum of the wire-accumulating type wire drawing machine is stable, thereby ensuring that the wire drawing production of the welding wire is smoothly carried out.
Description
Technical Field
The invention belongs to the field of welding wire drawing production, and particularly relates to a speed regulation control method of a wire drawing machine.
Background
The welding wire drawing equipment comprises a linear drawing machine and a wire-accumulating type drawing machine, wherein in the linear drawing machine equipment, a tension sensor is usually arranged at the position of a loose pulley corresponding to a winding drum, the winding condition of a welding wire on the winding drum is obtained by detecting the tension condition of the welding wire passing through the loose pulley, and the system controls the rotation speed of the winding drum according to the detection result of the tension sensor so as to ensure that the number of turns of the winding of the welding wire on the winding drum is certain. For the wire-accumulating type wire drawing machine, because the tension detection mechanism cannot be installed on the wire-accumulating type wire drawing machine, how to ensure that the number of winding turns of the welding wire on the corresponding winding drum of the wire-accumulating type wire drawing machine is constant becomes a problem to be solved urgently.
Disclosure of Invention
In view of this, the present invention aims to provide a speed regulation control method for a wire drawing machine, so as to realize real-time adjustment of the rotation speed of a reel during production of a wire-accumulating wire drawing machine, so that the number of winding turns of a welding wire on the reel meets the requirement.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a speed regulation control method for a wire drawing machine comprises the following steps:
s1, arranging two position sensors around a winding drum of a wire drawing machine, wherein the two position sensors correspond to a moving track of an upstream wheel of the winding drum in the circumferential direction; the two position sensors are electrically connected with a controller, and the controller is connected with a motor through a frequency converter;
s2, two position sensors detect the position change of the loose pulley in the circumferential direction, and transmit detection signals to the controller, the controller judges the rotating direction of the loose pulley according to the received signals, judges the winding or unwinding state of the winding drum according to the relation between the rotating direction of the loose pulley and the rotating direction of the winding drum, and adjusts the rotating speed of the motor by controlling the frequency converter according to the judgment result so as to adjust the rotating speed of the winding drum.
Further, in step S1, two position sensors are disposed in close proximity.
Further, the method for determining the winding or unwinding state of the winding drum in step S2 specifically includes: when the loose pulley and the winding drum rotate in the same direction, the winding drum is judged to be in a wire accumulation state, and at the moment, the loose pulley passes through two position sensors once in sequence, and the actual number of turns of the welding wire on the winding drum is recorded and increased by one turn; when loose pulley and reel antiport, judge that the reel is the unwrapping wire state, every two position sensor once of process in order of loose pulley this moment, the actual number of turns of record reel welding wire reduces the round.
Further, the specific method for controlling the motor to adjust the rotation speed of the winding drum according to the determination result in step S2 includes: the system presets the number of turns of welding wire winding on the reel to according to loose pulley direction of rotation and through two position sensor number of times statistics reel on the actual number of turns of winding of welding wire in order, the controller is according to the difference of the actual number of turns of winding and the preset number of turns of winding, calculates and output control signal control reel real-time rotational speed.
Furthermore, the method for calculating the real-time rotating speed of the winding drum comprises the following steps:
the controller controls the real-time rotating speed N = N0+ K (S-S0) of the winding drum;
wherein: n0 is the set rotating speed of the winding drum during wire drawing;
s is the preset number of turns of the welding wire in the winding drum during wire drawing;
s0 is the actual number of turns of the welding wire on the winding drum;
k is a rotation speed adjusting coefficient.
Compared with the prior art, the speed regulation control method of the wire drawing machine has the following advantages:
in the speed regulation control method of the wire drawing machine, the position change condition of the loose pulley is detected through the two position sensors, whether the wire is accumulated on the winding drum or is paid off is judged according to the detection signal, the motor is controlled to adjust the rotating speed of the winding drum according to the judgment result, and the wire accumulation on the winding drum or the paying off of the welding wire can be controlled through real-time adjustment of the rotating speed of the winding drum. The speed regulation method is simple, can well realize the regulation of the rotating speed of the winding drum, meets the production requirement, and further ensures the smooth proceeding of the wire drawing production of the welding wire.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a drawing state diagram of a welding wire in the present embodiment;
fig. 2 is a diagram showing a positional relationship among the position sensor, the spool, and the flywheel in the present embodiment.
Description of the reference numerals:
1-winding a drum; 2-a loose pulley; 3-a position sensor; 4-a motor; 5-pulley.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A wire drawing machine is shown in figure 1 and comprises a winding drum 1, a motor 4, a loose pulley 2 and a pulley 5, wherein in the wire drawing machine, the loose pulley is also called a wire wheel, a wire guide roller or a wire releasing guide wheel, the loose pulley is specifically connected in such a way that the motor 4 is connected with the winding drum 1, the winding drum 1 is driven by the motor 4 to rotate, and welding wires pass through the winding drum 1 and then sequentially pass through the loose pulley 2 and the pulley 5 to be output.
The speed regulation control method of the wire drawing machine comprises the following steps:
s1, arranging two position sensors 3 around a winding drum 1 of a wire drawing machine, wherein the two position sensors are preferably arranged in close proximity, and the two position sensors 3 correspond to the moving track of a travelling wheel 2 on the winding drum in the circumferential direction; the two position sensors 3 are electrically connected with a controller, and the controller is connected with a motor 4 through a frequency converter;
s2, two position sensors 3 detect the position change of the loose pulley in the circumferential direction, detect signals are transmitted to the controller, the controller judges the rotation direction of the loose pulley 2 according to the received signals, judges the wire accumulation or wire releasing state of the winding drum 1 according to the relation between the rotation direction of the loose pulley 2 and the rotation direction of the winding drum 1, and adjusts the rotating speed of the motor through controlling the frequency converter according to the judgment result so as to finally adjust the rotating speed of the winding drum.
In step S1, the two position sensors 3 may be disposed, for example, such that the two position sensors 3 are disposed outside the loose pulley 2 at a height equal to that of the loose pulley 2, as shown in fig. 1 and 2, and the two position sensors 3 detect the position change of the loose pulley 2 when it moves in the circumferential direction in the horizontal direction. The two position sensors 3 can also be arranged above the loose pulley 2, at this moment, the two position sensors 3 are respectively arranged downwards just opposite to the moving track of the loose pulley 2, and the two position sensors 3 respectively detect the position change condition when the loose pulley 2 moves in the circumferential direction in the vertical direction.
In step S2, the method of determining the state of the spool being accumulated or paid off specifically includes: when the controller judges that loose pulley 2 and reel 1 syntropy rotate according to two position sensor 3's signal precedence order, it is greater than unwrapping wire speed to show reel long line speed, and the reel is long line state, and the welding wire number of turns increases on it, and every is once through two position sensor 3 along this forward (with loose pulley syntropy rotation) loose pulley 2 in order, and the actual number of turns of recording reel 1 welding wire increases the round, and the system is with the actual number of turns of winding of reel welding wire +1 this moment. When the controller judges that loose pulley 2 and reel 1 reverse rotation according to the signal precedence order of two position sensor 3, it explains that reel linear speed is less than unwrapping wire speed, and the reel is the unwrapping wire state, and the number of turns of welding wire winding on the reel reduces, and every time the loose pulley 2 passes through two position sensor 3 in order along this reversal (with loose pulley reverse rotation), the actual number of turns of recording reel 1 welding wire reduces the round, and the system is with the actual number of turns-1 of winding of reel welding wire this moment.
The specific method for controlling the motor to adjust the rotating speed of the winding drum according to the judgment result in the step S2 comprises the following steps: the system presets the welding wire number of turns of winding on the reel to according to loose pulley direction of rotation and through two position sensor number of times statistics reel on the actual number of turns of winding of welding wire in order, the controller is according to the actual number of turns of winding and the difference of presetting the number of turns of winding, calculates and output control signal and controls motor speed through controlling the converter, finally realizes the real-time rotational speed adjustment of reel.
The method for calculating the real-time rotating speed of the winding drum comprises the following steps:
the controller finally controls the real-time rotating speed N = N0+ K (S-S0) of the winding drum;
wherein: n0 is the set rotating speed of the winding drum during wire drawing;
s is the preset number of turns of welding wires in the winding drum during wire drawing;
s0 is the actual number of turns of the welding wire on the winding drum;
k is a rotation speed adjusting coefficient.
The value of K is an empirical value. During wire drawing production, the winding drum is ensured to run smoothly at the whole speed section and cannot vibrate. Oscillation occurs when the winding drum runs, which indicates that the adjustment speed is excessively high and overshoots, namely the K value is large; too slow an adjustment speed may result in a non-timely compensation of the rotation speed. The K value principle is thus adjusted: no matter in which speed section the equipment runs, the speed of compensation can not cause reel speed to vibrate as the principle.
The speed regulation method is further described by using an embodiment I and an embodiment II:
in the first embodiment, before the welding wire is normally drawn, the step of regulating the rotating speed of the winding drum is explained, before the normal drawing production of the drawing machine, the welding wire is firstly required to be wound on the winding drum for a certain number of turns, namely the number of turns of the welding wire on the winding drum needs to reach the preset number of turns, the winding drum 2 is in an active wire accumulation state in the process, and the rotating speed of the winding drum during the active wire accumulation comprises the following steps:
(1) Zero winding of the welding wire on the winding drum at the moment, so that the actual number of turns S0 of the welding wire on the winding drum 1 in the system is cleared, namely S0=0;
(2) Starting a system, wherein S-S0= S, a winding drum 1 rotates at a rotating speed N = N0+ KS, a loose pulley 2 rotates around the winding drum 1 in the same direction, the winding drum is actively accumulated, when the loose pulley 2 passes through two position sensors 3 in the forward direction (in the same direction as the winding drum) for the first time, the winding drum 1 winds a first circle of welding wire, and the system records the actual number of turns S0=1 of the welding wire on the winding drum at the time;
(3) The controller judges that the loose pulley 2 and the winding drum 1 rotate in the same direction according to signals of the position sensors 3, judges that the winding drum 1 is in a line accumulation state, records the actual number of turns S0 of a welding wire of the winding drum 1 when the loose pulley 2 sequentially passes through the two position sensors 3 once, namely, increases one turn, and controls the real-time rotation speed N = N0+ K (S-S0) of the winding drum according to the actual number of turns S0 of the winding drum at the moment; therefore, in the active wire accumulating process that the number of turns of the welding wire on the winding drum is increased from 0 to S, the rotating speed of the winding drum 1 is gradually reduced from the value of N0+ KS;
(4) When the winding drum 1 accumulates wires to the actual number of turns S0= S of the welding wires, S-S0=0, the actual number of turns S0 of the welding wires on the winding drum recorded by the system reaches the preset number of turns S of the welding wires at the moment, the rotating speed of the winding drum is reduced to N = N0, namely the set rotating speed of the winding drum 2 during wire drawing production, the position of the loose pulley 2 tends to be stable at the moment, active wire accumulation speed regulation control of the winding drum is completed, winding of the preset number of turns of the welding wires is completed by the winding drum at the moment, and meanwhile the winding drum rotates at the set rotating speed of wire drawing.
In the second embodiment, after the active wire accumulation of the winding drum is completed, the wire drawing of the welding wire is normally performed, in order to ensure that the number of turns of the welding wire on the winding drum recorded in the production is kept as the preset number of turns of the welding wire, the rotating speed of the winding drum needs to be adjusted in real time, and the method for adjusting the rotating speed of the winding drum during the wire drawing production comprises the following steps:
(1) When the controller judges that the rotation direction of the loose pulley 2 is the same as that of the winding drum 1, the linear speed of the winding drum 1 is larger than the paying-off speed, the actual number of turns S0 of the winding drum 1 is larger than S, the winding drum is in a linear state, the controller controls the rotating speed of the winding drum 1 to be N = N0-K (S0-S), and the rotating speed of the winding drum 1 is reduced because S0-S is larger than 0, so that the linear speed is reduced, and the actual number of turns of welding wires on the winding drum is equal to the preset number of turns of the welding wires;
(2) When the controller judges that the rotation direction of the loose pulley 2 is opposite to that of the winding drum 1, the linear speed of the winding drum 1 is smaller than the paying-off speed, the actual number of turns S0 of the winding drum 1 is smaller than S, the winding drum is in a paying-off state, the controller controls the rotating speed N = N0-K (S0-S) of the winding drum 1, and the rotating speed of the winding drum 1 is increased due to the fact that S0-S is smaller than 0, the linear speed of the winding drum is increased, and therefore the actual number of turns of a welding wire on the winding drum is equal to the preset number of turns of the welding wire.
Now, taking K =1, S =10, and N0=50rpm as examples, the controller in normal wire drawing production will be described to adjust the rotation speed of the winding drum by the motor:
(1) When the system calculates the actual number of the reel S0=11, the controller calculates N =50rmp +1 (10-11) =49rpm according to the formula N = N0+ K (S-S0), and the controller controls the motor to adjust the rotation speed of the reel to 49rpm, wherein the reel is operated at the actual rotation speed N =49rpm, that is, the reel is operated at a rotation speed 1rpm lower than the given rotation speed N =50 rmp.
(2) When the system calculates the actual number of the reels S0=9, the controller calculates N =50rmp +1 (10-9) =51rpm according to the formula N = N0+ K (S-S0), and the controller controls the motor to adjust the rotation speed of the reels to 51rpm, i.e. the reels are operated at the actual rotation speed N =51rpm, i.e. the reels are operated at a rotation speed 1rpm higher than the given rotation speed N =50 rmp.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (2)
1. A speed regulation control method of a wire drawing machine is characterized by comprising the following steps: the method comprises the following steps:
s1, arranging two position sensors around a winding drum of a wire drawing machine, wherein the two position sensors correspond to the moving track of an upstream wheel on the winding drum in the circumferential direction; the two position sensors are electrically connected with a controller, and the controller is connected with a motor through a frequency converter;
s2, two position sensors detect the position change of the loose pulley in the circumferential direction, and transmit detection signals to a controller, the controller judges the rotation direction of the loose pulley according to the received signals, judges the coiling or uncoiling state of a coiling block according to the relation between the rotation direction of the loose pulley and the rotation direction of the coiling block, and adjusts the rotating speed of a motor by controlling a frequency converter according to the judgment result so as to adjust the rotating speed of the coiling block;
the method for judging the coiling or uncoiling state of the winding drum comprises the following steps: when the loose pulley and the winding drum rotate in the same direction, the winding drum is judged to be in a wire accumulation state, and at the moment, the loose pulley passes through two position sensors once in sequence, and the actual number of turns of the welding wire on the winding drum is recorded and increased by one turn; when the loose pulley and the winding drum rotate reversely, the winding drum is judged to be in a paying-off state, at the moment, the loose pulley passes through two position sensors once in sequence, and the actual number of turns of the welding wire of the winding drum is recorded to be reduced by one turn;
the specific method for controlling the motor to adjust the rotating speed of the winding drum according to the judgment result comprises the following steps: the system presets the number of winding turns of the welding wire on the winding drum, counts the actual number of winding turns of the welding wire on the winding drum according to the rotating direction of the loose pulley and the number of times of sequentially passing through the two position sensors, and calculates and outputs a control signal to control the real-time rotating speed of the winding drum according to the difference between the actual number of winding turns and the preset number of winding turns;
the method for calculating the real-time rotating speed of the winding drum comprises the following steps:
the controller controls the real-time rotating speed N = N0+ K (S-S0) of the winding drum;
wherein: n0 is the set rotating speed of the winding drum during wire drawing;
s is the preset number of turns of welding wires in the winding drum during wire drawing;
s0 is the actual number of turns of the welding wire on the winding drum;
k is a rotation speed adjusting coefficient.
2. The speed regulation control method of the wire drawing machine according to claim 1, characterized in that: in step S1, two of the position sensors are disposed in close proximity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110311980.7A CN113070357B (en) | 2021-03-24 | 2021-03-24 | Speed regulation control method for wire drawing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110311980.7A CN113070357B (en) | 2021-03-24 | 2021-03-24 | Speed regulation control method for wire drawing machine |
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| CN113070357A CN113070357A (en) | 2021-07-06 |
| CN113070357B true CN113070357B (en) | 2022-12-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2622002B2 (en) * | 1989-11-29 | 1997-06-18 | 日鐵溶接工業株式会社 | Wire rod feeder |
| IT1272560B (en) * | 1993-09-03 | 1997-06-23 | Redaelli Tecna Mecc Spa | MULTI-STAGE DRAWING MACHINE WITH THROW ADJUSTMENT |
| CN2199174Y (en) * | 1994-09-16 | 1995-05-31 | 江阴市南菁机械厂 | Double reel for wire rope drawing machine |
| CN2260672Y (en) * | 1996-05-31 | 1997-08-27 | 郅道宏 | Automatic speed-regulating device for drawing machine |
| IT1296099B1 (en) * | 1997-11-11 | 1999-06-09 | Marco Frigerio | MULTI-STEP DRAWING MACHINE EQUIPPED WITH A DEVICE FOR IMPROVED ADJUSTMENT AND CONTROL OF THE TENSION OF THE WIRE IN PROCESS |
| JP4087150B2 (en) * | 2002-05-21 | 2008-05-21 | 古河電気工業株式会社 | Winding method of wire |
| JP3771918B2 (en) * | 2003-10-01 | 2006-05-10 | 有限会社エフ・エー電子 | Wire drawing machine |
| CN2772664Y (en) * | 2005-02-05 | 2006-04-19 | 贵州航天南海机电有限公司 | Wire-stacking synchronous automatic speed controller of drum |
| JP2010042904A (en) * | 2008-08-12 | 2010-02-25 | Murata Machinery Ltd | Yarn winding machine |
| JP2010214405A (en) * | 2009-03-16 | 2010-09-30 | Kobe Steel Ltd | Welding wire winder |
| FR2944271B1 (en) * | 2009-04-09 | 2011-06-10 | Ritm | DEVICE FOR WINDING A WIRE ON A COIL WITH A CONSTANT WINDING ROLL |
| JP5719978B1 (en) * | 2014-06-26 | 2015-05-20 | トピー工業株式会社 | Cable system |
| CN205096258U (en) * | 2015-11-17 | 2016-03-23 | 浙江三瑞铜业有限公司 | Small -size high -speed copper line wire drawing machine |
| CN109317526A (en) * | 2018-12-11 | 2019-02-12 | 珠海桑贝思精密科技有限公司 | Wire-drawing frame and wire drawing machine |
| CN109332402A (en) * | 2018-12-11 | 2019-02-15 | 珠海桑贝思精密科技有限公司 | Silk thread slack adjuster and wire drawing machine |
| CN111389942B (en) * | 2020-03-18 | 2021-07-09 | 河南理工大学 | Super fine metal or alloy wire drawing device without relative sliding |
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2021
- 2021-03-24 CN CN202110311980.7A patent/CN113070357B/en active Active
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Effective date of registration: 20230802 Address after: No.1, Liujing Road, development zone, Dongli District, Tianjin Patentee after: Tianjin Jinqiao Welding Materials Group Co.,Ltd. Patentee after: Tianjin Jinqiao Equipment Manufacturing Co.,Ltd. Address before: No.1, Liujing Road, development zone, Dongli District, Tianjin Patentee before: Tianjin Jinqiao Welding Materials Group Co.,Ltd. |