CN102601285A - Forging production line - Google Patents
Forging production line Download PDFInfo
- Publication number
- CN102601285A CN102601285A CN2012100565277A CN201210056527A CN102601285A CN 102601285 A CN102601285 A CN 102601285A CN 2012100565277 A CN2012100565277 A CN 2012100565277A CN 201210056527 A CN201210056527 A CN 201210056527A CN 102601285 A CN102601285 A CN 102601285A
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- China
- Prior art keywords
- planker
- frame
- slide block
- jig arm
- bent axle
- 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.)
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- 238000005242 forging Methods 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- 230000005540 biological transmission Effects 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 210000000078 claw Anatomy 0.000 abstract 1
- 230000035611 feeding Effects 0.000 description 13
- 238000005520 cutting process Methods 0.000 description 5
- 230000032258 transport Effects 0.000 description 4
- 238000004080 punching Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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- Forging (AREA)
- Press Drives And Press Lines (AREA)
Abstract
The invention discloses a forging production line comprising a press machine and a feeding mechanical arm. The press machine comprises a sliding block A, a sliding block B and a Sliding block C, wherein the sliding block A is vertically and slidably arranged between the two side wall boards of a rack and connected with a crank shaft in a transmission way; the sliding block B is vertically and slidably arranged outside the left side wall board of the rack and connected with the crank shaft in a transmission way; the sliding block C is vertically and slidably arranged outside the left side wall board of the rack and connected with the crank shaft in a transmission way; and the rack is provided with corresponding work tabletops. The feeding mechanical arm comprises two clamping arms which are paired to use and straddle on a left rack and a right rack, wherein the two clamping arms are driven by a driving device C to move oppositely for gathering or separating from each other; and the two clamping arms can move left and right and four pairs of clamping claws for clamping blanks are oppositely arranged on the two clamping arms. In the technical scheme, a single multiple-station press machine is adopted and used for implementing multiple-procedure and multiple-station processing in the hot forging technology, the equipment cost and the occupied space are reduced, and the production efficiency is enhanced.
Description
Technical field
The invention belongs to the machining equipment field, relate in particular to a kind of forging line that adopts the processing of forcing press hot-forging forming.
Background technology
Forge hot is that forging stock is heated to the forging and molding operation of carrying out after the uniform temperature, comprises open die forging, loose tooling forging and die forging.Die forging is to utilize the hitting power of forging equipment (generally being forcing press) or pressure to make blank in the die cavity of forging mold, produce distortion, thereby obtains the forging method of forging, is to forge most important process in the processing; Forging precision is high; Production efficiency is high, is suitable in enormous quantities the forging and produces, and the die-forging forming quality is high; Can improve metal streamline and distribute, eliminate or improve banded microscopic structure, crystal grain thinning, the die-forging forming precision is high, production efficiency is high.
The forcing press that uses in the prior art is single station type; Need multistation continuously in the technology of processing being applied to forge especially forge hot etc.; A plurality of manufacturing procedures must be cooperated by a plurality of boards to be accomplished; There are shortcomings such as board quantity is many, use cost is high, take up room big, production efficiency is low, and also are unfavorable for using feeding mechanical hand to realize automated production.
Summary of the invention
In order to solve above-mentioned technical problem, the purpose of this invention is to provide a kind of forging line, adopt the unit multiple position press, be used for realizing the multiple operation multistation processing of thermal forging technology, reduce equipment cost and usage space, enhance productivity.
In order to reach above-mentioned purpose, the technical scheme below the present invention has adopted:
A kind of forging line; Comprise forcing press and the feeding mechanical hand that cooperates with it, said forcing press comprises frame; Frame is provided with motor, flywheel, clutch-brake, power transmission shaft, bent axle, slide block A, slide block B, slide block C; Wherein, power transmission shaft and bent axle rotate respectively and are arranged on the frame, and power transmission shaft one end is installed flywheel and clutch-brake; Flywheel is connected with electric-motor drive; The power transmission shaft other end and bent axle are in transmission connection, and said slide block A vertically is slidingly arranged between the both sides wallboard of frame and through connecting rod A, eccentric wheel A and bent axle and is in transmission connection, and said slide block B vertically is slidingly arranged in the wallboard outside, left side of frame and is in transmission connection through connecting rod B, eccentric wheel B and bent axle; Said slide block C vertically is slidingly arranged in the wallboard outside, right side of frame and is in transmission connection through connecting rod C, eccentric wheel C and bent axle, and said frame is provided with and said slide block A, slide block B, the corresponding work top of slide block C.Said eccentric wheel A, eccentric wheel B and the eccentric wheel C angle that staggers each other is arranged on the said bent axle.Said feeding mechanical hand comprises left frame, the right frame that is arranged in the forcing press and arranged on left and right sides and is crossed on left frame, the right frame two jig arm that pairing is mutually used; Following planker horizontal slip is arranged on the right frame and by drive unit A and drives move left and right, and last planker vertically is slidingly arranged in down on the planker and by drive unit B driving and moves up and down; Auxiliary planker down horizontally slips and is arranged on the left frame, and the auxiliary planker of going up vertically is slidingly arranged on the auxiliary planker down; The right-hand member of described two jig arm is slidingly connected and drives to relatively move and close up or separate by being installed in drive unit C on the planker respectively with before and after the last planker, and the left end of described two jig arm is slidingly connected with auxiliary upward planker front and back respectively and in the vertical direction relative fixed; Be oppositely arranged on described two jig arm and be provided with 4 pairs of jaws that are used for the clamping blank.Be provided with on described every pair of jaw and be used to realize the cooling duct that cools, the cooling duct on the jaw is connected with cooling water system through external pipe.Said going up on the planker is equipped with hopper, and hopper is between two jig arm, and said right frame is put on the shelf and is provided with material returned baffle plate, and material returned baffle plate right-hand member can insert the hopper bottom and be provided with the groove of placing blank at its right-hand member.Spacing between described 4 pairs of jaws and hopper are adjacent equates.
As preferably, the said drive unit A of planker down is the servomotor A that is installed on the right frame, and servomotor A is in transmission connection through screw mandrel with following planker.
As preferably, the said drive unit B that goes up planker is the adjustable cylinder of stroke.
As preferably, the drive unit C of said jig arm is a servo motor B, and servo motor B drives a screw mandrel and rotates, and this screw mandrel is threaded with a jig arm through left hand thread, is threaded with another jig arm through right-handed thread.
The present invention adopts the unit multiple position press owing to adopted above technical scheme, is used for realizing the multiple operation multistation processing of thermal forging technology, reduces equipment cost and usage space, enhances productivity.
Description of drawings
Fig. 1 is the structural representation of forging line;
Fig. 2 is the structural representation (positive side) of forcing press;
Fig. 3 is the structural representation (dorsal surface) of forcing press;
Fig. 4 is the structural representation (front) of forcing press;
Fig. 5 is the structural representation (positive side) of feeding mechanical hand;
Fig. 6 is the structural representation (dorsal surface) of feeding mechanical hand;
Fig. 7 is the structural representation (front) of feeding mechanical hand;
Fig. 8 is the structural representation (overlooking) of feeding mechanical hand.
The specific embodiment
Do a detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
Embodiment 1:
A kind of forging line as shown in Figure 1 comprises forcing press 1 and the feeding mechanical hand 2 that cooperates with it.
The forcing press of implementing to forge like Fig. 2, Fig. 3, shown in Figure 4 being used to 1; Comprise frame 101; Frame 101 is provided with motor 107, flywheel 105, clutch-brake 104, power transmission shaft 111, bent axle 112, slide block A102, slide block B 103, slide block C110; Wherein, Power transmission shaft 111 rotates on the both sides wallboard that is arranged on frame 1 respectively with bent axle 112; Power transmission shaft 111 1 ends are installed flywheel 105 and clutch-brake 104, and flywheel 105 is in transmission connection with motor 107, and power transmission shaft 111 other ends are in transmission connection through pinion 109 and the gear wheel 108 that is installed in bent axle 112 1 ends; Said slide block A102 vertically is slidingly arranged between the both sides wallboard of frame 101 and through connecting rod A, eccentric wheel A and bent axle 112 and is in transmission connection; Said slide block B 103 vertically is slidingly arranged in the wallboard outside, left side of frame 101 and is in transmission connection with bent axle 112 through connecting rod B, eccentric wheel B 106, and said slide block C110 vertically is slidingly arranged in the wallboard outside, right side of frame 101 and is in transmission connection through connecting rod C, eccentric wheel C113 and bent axle 112, and said frame 101 is provided with and said slide block A102, slide block B 103, the corresponding work top of slide block C110.Said eccentric wheel A, eccentric wheel B 106 and the eccentric wheel C113 angle that staggers each other is arranged on the said bent axle 112 (in the present embodiment, be benchmark with the eccentric wheel A, 15 ° in advance of eccentric wheel B 106, eccentric wheel C113 falls behind 15 °).Like this, bent axle 112 can drive three slide blocks and move up and down, and slide block A102 is a master slider; Slide block B 103, slide block C110 are secondary slide block; Realize that through three eccentric deflection angles are different the working time of three slide blocks staggers (in the present embodiment, slide block B 103, slide block A102, slide block C110 successively arrive lower dead center successively), guaranteed that fully the maximization of stability, reliability and the lathe energy of lathe rationally utilizes; The secondary slide block in both sides can when punching press, do upset flat, cut operation such as the end; Both reduce equipment cost (will realize originally that three process processing needed three forcing presses, forcing press of present embodiment can be realized the multiple operation pipelining now), dwindled the distance between equipment occupation space and the adjacent processing apparatus again; Thereby shortened feed distance, helped to enhance productivity.
Forge the feeding mechanical hand of implementing self-feeding like Fig. 5, Fig. 6, Fig. 7, shown in Figure 8 being used to, comprise left frame 202, the right frame 201 that is arranged in forcing press 1 and arranged on left and right sides and pass the left and right sides wallboard of forcing press and be crossed on left frame 202, the right frame 201 two jig arm 209 that pairing is mutually used; Following planker 203 is arranged on the right frame 201 and by the servomotor A205 that is installed on the right frame 201 through the guide rail horizontal slip and drives move left and right through the screw mandrel transmission, and last planker 204 vertically is slidingly arranged in down on the planker 203 and by cylinder (not shown on the figure) driving through guide pillar and moves up and down; Auxiliary planker 212 down horizontally slips through guide rail and is arranged on the left frame 202, and the auxiliary planker 211 of going up vertically is slidingly arranged on the auxiliary planker 212 down through guide pillar; The right-hand member of described two jig arm 209 is slidingly connected with last planker 204 front and back respectively (go up planker 204 be provided with guide rail) and relatively moves and close up or separate (in the present embodiment by being installed in servo motor B 207 drivings on the planker 204; Servo motor B 207 drives a screw mandrel and rotates; This screw mandrel is threaded with a jig arm through left hand thread; Be threaded with another jig arm through right-handed thread; Can relatively move synchronously like this and realize clamping or unclamp), the left end of described two jig arm 209 goes up that planker 211 front and back are slidingly connected and vertical direction relative fixed (auxiliary going up on the planker 211 is provided with guide rail) with auxiliary respectively; Be oppositely arranged on described two jig arm 209 and be provided with 4 pairs of jaws 210 that are used for the clamping blank, be provided with the cooling duct on every pair of jaw 210 and be used for realizing cooling, the cooling duct on the jaw is connected with pump with water tank on the frame through external pipe; Said going up on the planker 204 is equipped with hopper 206, and hopper 206 is between two jig arm 209, and the adjacent spacing of the 4 pairs of jaws 210 and hopper 204 equates; Said right frame 201 is put on the shelf and is provided with material returned baffle plate 208; Material returned baffle plate 208 right-hand members can insert hopper 206 bottoms (when hopper moves to left end) and from hopper 206, carry out a blank through the groove on it; Hopper 206 bottoms are for pulling and pushing plate structure, i.e. the backgauge plate is plugged in and stops blank to fall in the drawer of hopper bottom during not blanking, when material returned baffle plate inserts drawer, releases the backgauge plate; Blank falls in the groove on the material returned baffle plate; When material returned baffle plate withdrawed from hopper bottom drawer, blank was taken out of, and the backgauge plate resets under elastic component drives and stops next blank to fall.
Present embodiment has blanking station, first processing stations (it is flat to upset), second processing stations (hot-forging forming), the 3rd processing stations (cutting the end), five stations of blanking station when forge hot is used; The blank that first pair of jaw (rightmost) on manipulator 2 jig arm 209 is used to be implemented between blanking station and first processing stations (it is flat to upset) transports; The blank that the second pair of jaw is used to be implemented between first processing stations (it is flat to upset) and second processing stations (hot-forging forming) transports; The blank that the 3rd pair of jaw is used to be implemented between second processing stations (hot-forging forming) and the 3rd processing stations (cutting the end) transports, and the blank that the 4th pair of jaw is used to be implemented between the 3rd processing stations (cutting the end) and the blanking station transports.Workflow is following:
1) jig arm 209 with manipulator 2 is an original state at low order end, and the jig arm 209 of manipulator 2, last planker 204 and the auxiliary planker 211 of going up move up to top dead centre earlier, and two jig arm 209 of servo motor B 207 drivings are closed up into the material folding state again; This moment is at the blanking station, the blank on the first pair of jaw clamping material returned baffle plate 208; This moment is first processing stations (it is flat to upset), the blank below the secondary slide block C110 on second pair of jaw clamp pressure machine 1 right side; This moment is at second processing stations (hot-forging forming), the blank of the 3rd couple of jaw clamp pressure machine 1 master slider A102 below; This moment the 3rd processing stations (cutting the end), the blank of secondary slide block B 103 belows in the 4th pair of jaw clamp pressure machine 1 left side.
2) jig arm 209 of manipulator 2, last planker 204 and the auxiliary planker 211 of going up are moved to the left a station distance, and jig arm was opened and is the blowing state in 209 minutes; This moment, material returned baffle plate 208 carried out a blank from hopper 206 at the blanking station; This moment, first pair of jaw was placed on blank the secondary slide block C110 below on forcing press 1 right side first processing stations (it is flat to upset); This moment, second pair of jaw was placed on forcing press 1 master slider A102 below with blank at second processing stations (hot-forging forming); This moment, the 3rd pair of jaw was placed on blank secondary slide block B 103 belows in forcing press 1 left side the 3rd processing stations (cutting the end); This moment, the 4th pair of blank that jaw will machine dropped into the interior cooling of water tank (also can devices such as conveyer belt or slideway be set below the blanking station sees the blank that machines off) of left frame 202 at the blanking station.
3) jig arm 209 of manipulator 2, go up planker 204 and auxiliary and go up planker 211 and move right a station distance and descend again and reset, wait for that three stations on the forcing press 1 are accomplished processing after, implement next feeding flow process again.
The forcing press 1 of above-mentioned three stations is not limited to the hot-forging forming that is used in the foregoing description; Go for other multiple site punching processing technology (for example cold forging punching press) equally; Above-mentioned feeding mechanical hand 2 also is not limited to the five station feedings that are used in the foregoing description, can be used for other more multistation or less station feeding equally.The foregoing description only is one of preferred embodiments of the present invention, and protection scope of the present invention is not limited to the foregoing description.
Claims (4)
1. forging line; Comprise forcing press (1) and the feeding mechanical hand (2) that cooperates with it; It is characterized in that; Said forcing press (1) comprises frame (101); Frame (101) is provided with motor (107), flywheel (105), clutch-brake (104), power transmission shaft (111), bent axle (112), slide block A (102), slide block B (103), slide block C (110); Wherein, power transmission shaft (111) and bent axle (112) rotate respectively and are arranged on the frame (1), and power transmission shaft (111) one ends are installed flywheel (105) and clutch-brake (104); Flywheel (105) is in transmission connection with motor (107); Power transmission shaft (111) other end and bent axle (112) are in transmission connection, and said slide block A (102) vertically is slidingly arranged between the both sides wallboard of frame (101) and is in transmission connection through connecting rod A, eccentric wheel A and bent axle (112), and the wallboard outside, left side that said slide block B (103) vertically is slidingly arranged in frame (101) also is in transmission connection through connecting rod B, eccentric wheel B (106) and bent axle (112); Said slide block C (110) vertically is slidingly arranged in the wallboard outside, right side of frame (101) and is in transmission connection with bent axle (112) through connecting rod C, eccentric wheel C (113), and said frame (101) is provided with and said slide block A (102), slide block B (103), the corresponding work top of slide block C (110); Said eccentric wheel A, eccentric wheel B (106) and eccentric wheel C (113) angle that staggers each other is arranged on the said bent axle (112); Said feeding mechanical hand comprises left frame (202), the right frame (201) that is arranged in forcing press (1) and arranged on left and right sides and is crossed on left frame (202), the right frame (201) two jig arm (209) that pairing is mutually used; Following planker (203) horizontal slip is arranged on right frame (201) and upward and by drive unit A drives move left and right, and last planker (204) vertically is slidingly arranged in down planker (203) and upward and by drive unit B driving moves up and down; Auxiliary planker (212) down horizontally slips and is arranged on the left frame (202), and the auxiliary planker (211) of going up vertically is slidingly arranged on the auxiliary planker (212) down; The right-hand member of described two jig arm (209) is slidingly connected and drives to relatively move and close up or separate by being installed in drive unit C on the planker (204) respectively with before and after the last planker (204), and the left end of described two jig arm (209) is slidingly connected with auxiliary upward planker (211) front and back respectively and in the vertical direction relative fixed; Be oppositely arranged on described two jig arm (209) and be provided with 4 pairs of jaws (210) that are used for the clamping blank; Be provided with on described every pair of jaw (210) and be used to realize the cooling duct that cools, the cooling duct on the jaw is connected with cooling water system through external pipe; Said going up on the planker (204) is equipped with hopper (206); Hopper (206) is positioned between two jig arm (209); Said right frame (201) is put on the shelf and is provided with material returned baffle plate (208), and material returned baffle plate (208) right-hand member can insert hopper (206) bottom and be provided with the groove of placing blank at its right-hand member; Spacing between described 4 pairs of jaws (210) and hopper (204) are adjacent equates.
2. a kind of forging line according to claim 1 is characterized in that, the drive unit A of said planker (203) down is for being installed in the servomotor A (205) on the right frame (201), and servomotor A (205) is in transmission connection through screw mandrel with following planker (203).
3. a kind of forging line according to claim 1 is characterized in that, the said drive unit B that goes up planker (204) is the adjustable cylinder of stroke.
4. a kind of forging line according to claim 1; It is characterized in that; The drive unit C of said jig arm (209) is servo motor B (207); Servo motor B (207) drives a screw mandrel and rotates, and this screw mandrel is threaded with a jig arm through left hand thread, is threaded with another jig arm through right-handed thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210056527.7A CN102601285B (en) | 2012-03-06 | 2012-03-06 | Forging production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210056527.7A CN102601285B (en) | 2012-03-06 | 2012-03-06 | Forging production line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102601285A true CN102601285A (en) | 2012-07-25 |
| CN102601285B CN102601285B (en) | 2014-11-26 |
Family
ID=46519268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210056527.7A Active CN102601285B (en) | 2012-03-06 | 2012-03-06 | Forging production line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102601285B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103240380A (en) * | 2013-04-12 | 2013-08-14 | 杜洋 | Fetching, shifting and discharging device for upsetting for oil tubes and sucker rods |
| CN106424513A (en) * | 2016-10-10 | 2017-02-22 | 长兴海普机械科技有限公司 | Forging mechanical equipment |
| CN110744003A (en) * | 2019-10-31 | 2020-02-04 | 肖亚凡 | Be used for forged middle part hammering device of luoyang shovel |
| CN111069507A (en) * | 2019-12-29 | 2020-04-28 | 江苏金源高端装备股份有限公司 | Automatic forging line of big nut |
| CN111069505A (en) * | 2019-12-29 | 2020-04-28 | 江苏金源高端装备股份有限公司 | Automatic forging process for bearing ring |
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| DE2626728A1 (en) * | 1975-06-24 | 1977-01-13 | Warnke Umformtech Veb K | Multiple plunger press with lower drive - has side linkages for power transmission |
| CN2154137Y (en) * | 1991-08-21 | 1994-01-26 | 河南省安阳锻压设备厂 | Multi-position automatic press forging machine |
| CN1167678A (en) * | 1996-06-11 | 1997-12-17 | Aida(会田)工程技术株式会社 | Slide plate drive for mechanical press |
| CN1169360A (en) * | 1996-07-03 | 1998-01-07 | Aida(会田)工程技术株式会社 | Multi-slide mechanical press |
| CN2873417Y (en) * | 2005-11-11 | 2007-02-28 | 上海日发数字化系统有限公司 | Synchronous screw and its feeding mechanism |
| CN201483488U (en) * | 2009-09-10 | 2010-05-26 | 高尔荣 | Transmission manipulator |
| CN102173097A (en) * | 2011-02-12 | 2011-09-07 | 中国农业大学 | Multi-station automatic feeding method and device |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2626728A1 (en) * | 1975-06-24 | 1977-01-13 | Warnke Umformtech Veb K | Multiple plunger press with lower drive - has side linkages for power transmission |
| CN2154137Y (en) * | 1991-08-21 | 1994-01-26 | 河南省安阳锻压设备厂 | Multi-position automatic press forging machine |
| CN1167678A (en) * | 1996-06-11 | 1997-12-17 | Aida(会田)工程技术株式会社 | Slide plate drive for mechanical press |
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| CN102173097A (en) * | 2011-02-12 | 2011-09-07 | 中国农业大学 | Multi-station automatic feeding method and device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103240380A (en) * | 2013-04-12 | 2013-08-14 | 杜洋 | Fetching, shifting and discharging device for upsetting for oil tubes and sucker rods |
| CN106424513A (en) * | 2016-10-10 | 2017-02-22 | 长兴海普机械科技有限公司 | Forging mechanical equipment |
| CN110744003A (en) * | 2019-10-31 | 2020-02-04 | 肖亚凡 | Be used for forged middle part hammering device of luoyang shovel |
| CN111069507A (en) * | 2019-12-29 | 2020-04-28 | 江苏金源高端装备股份有限公司 | Automatic forging line of big nut |
| CN111069505A (en) * | 2019-12-29 | 2020-04-28 | 江苏金源高端装备股份有限公司 | Automatic forging process for bearing ring |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102601285B (en) | 2014-11-26 |
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Inventor after: Wang Qicheng Inventor after: Wang Yansen Inventor before: Gao Errong Inventor before: Wu Min Inventor before: Shen Huaqiang |
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Effective date of registration: 20170606 Address after: 266109, Shandong Province, Chengyang District, Qingdao Province Xia Village Street historian Village Patentee after: Acer Tengda Qingdao Machinery Manufacturing Co.,Ltd. Address before: 313219 Zhejiang province Huzhou city Deqing County Town Road No. 1 Chomo leidian Patentee before: ZHEJIANG BOLEI HEAVY MACHINE TOOL MANUFACTURING Co.,Ltd. |
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