CN112958690B - Aluminium veneer punching equipment - Google Patents
Aluminium veneer punching equipment Download PDFInfo
- Publication number
- CN112958690B CN112958690B CN202110222226.6A CN202110222226A CN112958690B CN 112958690 B CN112958690 B CN 112958690B CN 202110222226 A CN202110222226 A CN 202110222226A CN 112958690 B CN112958690 B CN 112958690B
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- Prior art keywords
- frame
- fixed
- guide rail
- cylinder
- moving frames
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- 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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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/04—Centering the work; Positioning the tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/34—Perforating tools; Die holders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
- B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
- B21D43/11—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers for feeding sheet or strip material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The invention provides aluminum veneer punching equipment, and belongs to the technical field of machinery. An aluminum veneer punching device comprises a rack, wherein a first guide rail and a second guide rail are fixed on the rack, a workbench is arranged between the first guide rail and the second guide rail, a through hole is formed in the middle of the workbench, the first guide rail is positioned below the workbench, a plurality of first moving frames are arranged on the first guide rail in a sliding manner, die holes are formed in the first moving frames, lower dies are arranged in each die hole in a sliding manner, stamping holes with different shapes are formed in each lower die, a first driving mechanism for driving all the first moving frames to move is arranged on the rack, a first push rod motor is fixed on the rack, and a push rod of the first push rod motor can upwards send one of the lower dies into the through hole; the second guide rail is located the top of workstation, and the second guide rail is gone up to slide and is provided with a plurality of second and removes the frame. The invention has the advantages of high punching efficiency and punching diversity.
Description
Technical Field
The invention belongs to the technical field of machinery, and particularly relates to aluminum veneer punching equipment.
Background
Traditional aluminium veneer perforating device divide into three kinds, and one kind is with aluminium veneer removal, and the back drift is motionless in the original position, but punches and can only select a pattern, can not diversified selection, needs diversified selection how need a plurality of lathe cooperate or manual switching drift. The other type is that the aluminum single plate is fixed, the milling cutter moves, the required holes are milled on the aluminum single plate by moving the drill, the hole patterns can be changed, but the milling cutter has low moving speed and low efficiency. The last method is to directly adopt laser cutting, slag is easily formed during cutting, post treatment is needed, and the cutting efficiency is low.
Disclosure of Invention
The invention aims to solve the problems in the prior art, provides aluminum veneer punching equipment and solves the problem of low punching efficiency.
The purpose of the invention can be realized by the following technical scheme:
an aluminum veneer punching device comprises a rack and is characterized in that a first guide rail and a second guide rail are fixed on the rack, a workbench is arranged between the first guide rail and the second guide rail, a through hole is formed in the middle of the workbench, the first guide rail is positioned below the workbench, a plurality of first moving frames are arranged on the first guide rail in a sliding mode, die holes are formed in the first moving frames, lower dies are arranged in each die hole in a sliding mode, punching holes with different shapes are formed in each lower die, a first driving mechanism for driving all the first moving frames to move is arranged on the rack, a first push rod motor is fixed on the rack, and a push rod of the first push rod motor can upwards send one of the lower dies into the through hole; the second guide rail is positioned above the workbench, a plurality of second moving frames are arranged on the second guide rail in a sliding manner, fixed cylinders are fixed on the second moving frames, stamping cylinders are arranged in the fixed cylinders in a sliding manner and are connected with the second moving frames through tension springs, stamping columns corresponding to the shapes of stamping holes in the lower die are fixed in the stamping cylinders, flattening cylinders are arranged at the lower ends of the stamping cylinders and are provided with a plurality of sliding holes, a plurality of sliding rods are fixed on the flattening cylinders and are arranged in the sliding holes in a sliding manner, second driving mechanisms for driving all the second moving frames to move are arranged on the rack, the flattening cylinders are connected with the stamping cylinders through pressure springs, second push rod motors are fixed on the rack, and push rods of the second push rod motors can press the stamping columns into the corresponding stamping holes; the machine frame is provided with a transfer mechanism which is used for fixing the aluminum veneer and can drive the aluminum veneer to move randomly in the horizontal direction of the workbench.
In the aluminum veneer punching equipment, the guide part is fixed around the through hole of the workbench.
In the above aluminum veneer punching apparatus, the first driving mechanism includes a first driving motor, a first screw rod, and a first frame, the first frame is slidably disposed on the first guide rail, the first frame has a first limit area, all the first moving frames are disposed in the first limit area, the first driving motor is fixed on the frame, the first screw rod is rotatably connected to the frame, the first screw rod is in threaded connection with the first frame, and the first screw rod is in transmission connection with the first driving motor.
In the above aluminum veneer punching apparatus, the second driving mechanism includes a second driving motor, a second screw rod and a second frame, the second frame is slidably disposed on the second guide rail, the second frame is provided with a second spacing region, all the second moving frames are disposed in the second spacing region, the second driving motor is fixed on the frame, the second screw rod is rotatably connected to the frame, the second screw rod is in threaded connection with the second frame, and the second screw rod is in transmission connection with the second driving motor.
In the aluminum veneer punching equipment, the frame is fixed with the air pump and the air blowing pipe, the air pump is connected with the air blowing pipe, and the air outlet of the air blowing pipe is aligned to the through hole on the workbench.
At above-mentioned aluminium veneer punching equipment, the transfer mechanism including transfer frame, first support arm, second support arm, the transfer frame link to each other with take its actuating mechanism that arbitrary direction removed on the horizontal plane, the removal put up and be fixed with the guide rail, first support arm and second support arm slide and set up on the guide rail, the removal put up and be fixed with clamping component, clamping component include punch holder and lower plate, the lower plate fix on removing the frame, the removal put up and be fixed with the cylinder, the punch holder fix on the piston rod of cylinder, first support arm and second support arm be frame structure.
Compared with the prior art, the invention has the following advantages:
in the course of working, compare in traditional processing equipment, this equipment can replace multiunit stamping die according to the actual demand that punches, then according to the requirement, carries out the different holes of punching press on an aluminium veneer, and is efficient, and the form is various. The advantages are integrated on one device, and the maintenance cost is low.
Drawings
FIG. 1 is a schematic of the present invention.
FIG. 2 is a schematic view of the present invention at the punching post.
Fig. 3 is a schematic view at the lower die in the present invention.
Fig. 4 is a schematic view at the first support arm and the second support arm in the present invention.
In the figure, 1, a first guide rail; 2. a second guide rail; 3. a work table; 3a, a through hole; 4. a first moving frame; 5. a lower die; 5a, punching a hole; 6. a first push rod motor; 7. a second moving frame; 8. a fixed cylinder; 9. punching the cylinder; 10. a tension spring; 11. punching the column; 12. flattening the cylinder; 13. a slide bar; 14. a pressure spring; 15. a second push rod motor; 16. a guide member; 17. a first drive motor; 18. a first screw; 19. a first frame; 20. a second drive motor; 21. a second screw; 22. a second frame; 23. an air pump; 24. an air blowing pipe; 25. a transfer rack; 26. a first support arm; 27. a second support arm; 28. an upper splint; 29. a lower splint; 30. and a cylinder.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 4, an aluminum veneer punching device includes a frame, a first guide rail 1 and a second guide rail 2 are fixed on the frame, a workbench 3 is arranged between the first guide rail 1 and the second guide rail 2, a through hole 3a is formed in the middle of the workbench 3, the first guide rail 1 is located below the workbench 3, a plurality of first moving frames 4 are slidably arranged on the first guide rail 1, a die hole is formed in each first moving frame 4, a lower die 5 is slidably arranged in each die hole, each lower die 5 is provided with punching holes 5a with different shapes, a first driving mechanism for driving all the first moving frames 4 to move is arranged on the frame, a first push rod motor 6 is fixed on the frame, and a push rod of the first push rod motor 6 can send one of the lower dies 5 upwards into the through hole 3 a; the second guide rail 2 is positioned above the workbench 3, a plurality of second moving frames 7 are slidably arranged on the second guide rail 2, a fixed cylinder 8 is fixed on each second moving frame 7, a stamping cylinder 9 is slidably arranged in each fixed cylinder 8, each stamping cylinder 9 is connected with each second moving frame 7 through a tension spring 10, a stamping column 11 corresponding to the stamping hole 5a on the lower die 5 in shape is fixed in each stamping cylinder 9, a flattening cylinder 12 is arranged at the lower end of each stamping cylinder 9, a plurality of sliding holes are formed in each stamping cylinder 9, a plurality of sliding rods 13 are fixed on each flattening cylinder 12, the sliding rods 13 are slidably arranged in the sliding holes, a second driving mechanism for driving all the second moving frames 7 to move is arranged on the rack, each flattening cylinder 12 is connected with each stamping cylinder 9 through a pressing rod 14, a second push rod motor 15 is fixed on the rack, and a push rod of each second push rod motor 15 can press the stamping column 11 into the corresponding stamping hole 5 a; the frame is provided with a transfer mechanism which is used for fixing the aluminum veneer and can drive the aluminum veneer to move randomly in the horizontal direction of the workbench 3.
The working principle of the invention is as follows: the aluminum veneer is prevented from being placed on a transfer mechanism, the aluminum veneer can move on a workbench 3 in any horizontal direction through the transfer mechanism, according to the shape of the needed punching hole, a lower die 5 and a punching post 11 above the lower die are driven to move through a first driving mechanism and a second driving mechanism and correspond to each other, the lower die 5 is driven to enter a through hole 3a of the workbench 3 through a first push rod motor 6, the upper end of the lower die 5 is abutted against the lower surface of the aluminum veneer, then a punching cylinder 9 is driven to press downwards through a second push rod motor 15, a pressing cylinder 12 at the lower part of the punching cylinder 9 is in contact with the upper surface of the aluminum veneer in advance and is pressed tightly, then the punching post 11 is pressed downwards and enters a punching hole 5a of the lower die 5, the aluminum veneer is punched with the corresponding hole, after the punching is completed, the lower die 5 is driven to move downwards by the first push rod motor 6 and then moves to the next position needing punching, then the lower die 5 continues to move upwards and is attached to the lower surface of the aluminum veneer, and the steps are repeated until all the corresponding positions of the punching post 11 are punched, and the next corresponding type is switched, and the lower die post 5 and the punching hole is continued to be punched.
The invention has higher stamping efficiency, has more diversified stamping options compared with the first stamping equipment, can have faster stamping efficiency compared with the second stamping equipment, can directly discharge the stamped fragments through the stamping hole 5a, enables a machine tool to be cleaner, avoids scratches in the moving and processing of the aluminum single plate, has faster processing efficiency compared with the third stamping equipment, also has multiple processing options and has lower maintenance cost.
Specifically, a guide member 16 is fixed around the through hole 3a of the table 3. The lower die 5 can be accurately inserted into the through hole 3a of the table 3 by the guide member 16.
Specifically, the first driving mechanism includes a first driving motor 17, a first screw 18 and a first frame 19, the first frame 19 is slidably disposed on the first guide rail 1, the first frame 19 has a first limit area, all the first moving frames 4 are disposed in the first limit area, the first driving motor 17 is fixed on the rack, the first screw 18 is rotatably connected to the rack, the first screw 18 is in threaded connection with the first frame 19, and the first screw 18 is in transmission connection with the first driving motor 17. The first driving motor 17 is started to drive the first screw 18 to move, the first screw 18 drives the first frame 19 to move, and the first frame 19 drives all the first moving frames 4 to move on the first guide rail 1.
Specifically, the second driving mechanism includes a second driving motor 20, a second screw 21 and a second frame 22, the second frame 22 is slidably disposed on the second guide rail 2, the second frame 22 is provided with a second limiting region, all the second moving frames 7 are disposed in the second limiting region, the second driving motor 20 is fixed on the rack, the second screw 21 is rotatably connected to the rack, the second screw 21 is in threaded connection with the second frame 22, and the second screw 21 is in transmission connection with the second driving motor 20. The second driving motor 20 is started to drive the second screw 21 to move, the second screw 21 drives the second frame 22 to move, and the second frame 22 drives all the second moving frames 7 to move on the second guide rail 2.
Specifically, an air pump 23 and an air blowing pipe 24 are fixed on the frame, the air pump 23 is connected with the air blowing pipe 24, and an air outlet of the air blowing pipe 24 is aligned with the through hole 3a on the workbench 3. After the punching column 11 is pushed out from the lower die 5, the air pump 23 is started to blow air into the punching hole 5a of the lower die 5 through the air blowing pipe 24, so that the metal sheet is prevented from being clamped in the punching hole 5 a.
Specifically, the transfer mechanism comprises a transfer frame 25, a first support arm 26 and a second support arm 27, the transfer frame 25 is connected with a driving mechanism which is provided with the transfer frame to move in any direction on a horizontal plane, a guide rail is fixed on the moving frame, the first support arm 26 and the second support arm 27 are arranged on the guide rail in a sliding mode, a clamping assembly is fixed on the moving frame and comprises an upper clamping plate 28 and a lower clamping plate 29, the lower clamping plate 29 is fixed on the moving frame, an air cylinder 30 is fixed on the moving frame, the upper clamping plate 28 is fixed on a piston rod of the air cylinder 30, and the first support arm 26 and the second support arm 27 are of a frame structure. According to the arrangement of the holes, the positions of the first supporting arm 26 and the second supporting arm 27 are adjusted, the situation that the aluminum veneer at the positions of the first supporting arm 26 and the second supporting arm 27 needs to be punched is avoided, the aluminum veneer is driven by a driving mechanism to move randomly in the horizontal direction, and the driving mechanism is the prior art. After the aluminum veneer is placed on the first supporting arm 26 and the second supporting arm 27, one side of the aluminum veneer is fixed through the clamping assembly, and the aluminum veneer is prevented from sliding in the machining process. The frame structure can provide a supporting area and facilitate stamping.
The above components are all standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experiments.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. An aluminum veneer punching device comprises a rack and is characterized in that a first guide rail and a second guide rail are fixed on the rack, a workbench is arranged between the first guide rail and the second guide rail, a through hole is formed in the middle of the workbench, the first guide rail is positioned below the workbench, a plurality of first moving frames are arranged on the first guide rail in a sliding mode, die holes are formed in the first moving frames, lower dies are arranged in each die hole in a sliding mode, punching holes in different shapes are formed in each lower die, a first driving mechanism for driving all the first moving frames to move is arranged on the rack, a first push rod motor is fixed on the rack, and a push rod of the first push rod motor can upwards send one of the lower dies into the through hole; the second guide rail is positioned above the workbench, a plurality of second moving frames are arranged on the second guide rail in a sliding manner, a fixed cylinder is fixed on the second moving frames, a stamping cylinder is arranged in the fixed cylinder in a sliding manner and is connected with the second moving frames through a tension spring, stamping columns corresponding to the shapes of the stamping holes in the lower die are fixed in the stamping cylinder, a flattening cylinder is arranged at the lower end of the stamping cylinder and is provided with a plurality of sliding holes, a plurality of sliding rods are fixed on the flattening cylinder and are arranged in the sliding holes in a sliding manner, a second driving mechanism for driving all the second moving frames to move is arranged on the rack, the flattening cylinder is connected with the stamping cylinder through a pressure spring, a second push rod motor is fixed on the rack, and the stamping columns can be pressed into the corresponding stamping holes through a push rod of the second push rod motor; the machine frame is provided with a transfer mechanism which is used for fixing the aluminum veneer and can drive the aluminum veneer to move randomly in the horizontal direction of the workbench.
2. The aluminum veneer punching apparatus according to claim 1, wherein a guide member is fixed around the through hole of said work table.
3. The aluminum veneer punching device according to claim 1, wherein the first driving mechanism comprises a first driving motor, a first screw rod and a first frame, the first frame is slidably disposed on the first guide rail, the first frame is provided with a first limit area, all the first moving frames are disposed in the first limit area, the first driving motor is fixed on the frame, the first screw rod is rotatably connected to the frame, the first screw rod is in threaded connection with the first frame, and the first screw rod is in transmission connection with the first driving motor.
4. The aluminum veneer punching device according to claim 1, wherein said second driving mechanism includes a second driving motor, a second screw, and a second frame, said second frame is slidably disposed on a second guide rail, said second frame has a second limit region, all second moving frames are disposed in the second limit region, said second driving motor is fixed on the frame, said second screw is rotatably connected to the frame, the second screw is in threaded connection with the second frame, and the second screw is in transmission connection with the second driving motor.
5. The aluminum veneer punching equipment according to claim 1, characterized in that an air pump and an air blowing pipe are fixed on the frame, the air pump is connected with the air blowing pipe, and an air outlet of the air blowing pipe is aligned with the through hole on the workbench.
6. The aluminum veneer punching device according to claim 1, wherein the transfer mechanism includes a transfer frame, a first support arm, and a second support arm, the transfer frame is connected to a driving mechanism with the transfer frame moving in any direction on a horizontal plane, a guide rail is fixed on the transfer frame, the first support arm and the second support arm are slidably disposed on the guide rail, a clamping assembly is fixed on the transfer frame, the clamping assembly includes an upper clamping plate and a lower clamping plate, the lower clamping plate is fixed on the transfer frame, an air cylinder is fixed on the transfer frame, the upper clamping plate is fixed on a piston rod of the air cylinder, and the first support arm and the second support arm are of a frame structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110222226.6A CN112958690B (en) | 2021-02-28 | 2021-02-28 | Aluminium veneer punching equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110222226.6A CN112958690B (en) | 2021-02-28 | 2021-02-28 | Aluminium veneer punching equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112958690A CN112958690A (en) | 2021-06-15 |
| CN112958690B true CN112958690B (en) | 2022-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110222226.6A Active CN112958690B (en) | 2021-02-28 | 2021-02-28 | Aluminium veneer punching equipment |
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| CN (1) | CN112958690B (en) |
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| CN105817523A (en) * | 2016-05-31 | 2016-08-03 | 佛山市爵豹机械设备有限公司 | Multi-station punching machine |
| CN206953143U (en) * | 2017-03-29 | 2018-02-02 | 莆田市佳宜科技股份有限公司 | A kind of printed circuit board punch device |
| CN208195338U (en) * | 2018-05-16 | 2018-12-07 | 青岛大东自动化科技有限公司 | Two-track dynamic formula stamping device |
| CN208303721U (en) * | 2018-05-30 | 2019-01-01 | 东莞王氏港建机械有限公司 | A kind of PCB inner plating perforating press mold safety device |
| CN111195684A (en) * | 2020-02-26 | 2020-05-26 | 杭州源航工业设计有限公司 | Mechanical stamping easy-die-changing device and using method |
| CN211386508U (en) * | 2019-11-27 | 2020-09-01 | 安阳县水冶金盾机修厂 | Dustpan rivet fixing hole processing equipment in dustpan production line |
| CN211707871U (en) * | 2020-03-04 | 2020-10-20 | 嘉兴亿豪新材料股份有限公司 | Perforating device for aluminum gusset plate |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7284402B2 (en) * | 2004-11-30 | 2007-10-23 | Ford Global Technologies, L.L.C. | System and process for superplastic forming |
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2021
- 2021-02-28 CN CN202110222226.6A patent/CN112958690B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001353533A (en) * | 2000-06-14 | 2001-12-25 | Masami Tanaka | Shearing apparatus for sash member |
| CN105817523A (en) * | 2016-05-31 | 2016-08-03 | 佛山市爵豹机械设备有限公司 | Multi-station punching machine |
| CN206953143U (en) * | 2017-03-29 | 2018-02-02 | 莆田市佳宜科技股份有限公司 | A kind of printed circuit board punch device |
| CN208195338U (en) * | 2018-05-16 | 2018-12-07 | 青岛大东自动化科技有限公司 | Two-track dynamic formula stamping device |
| CN208303721U (en) * | 2018-05-30 | 2019-01-01 | 东莞王氏港建机械有限公司 | A kind of PCB inner plating perforating press mold safety device |
| CN211386508U (en) * | 2019-11-27 | 2020-09-01 | 安阳县水冶金盾机修厂 | Dustpan rivet fixing hole processing equipment in dustpan production line |
| CN111195684A (en) * | 2020-02-26 | 2020-05-26 | 杭州源航工业设计有限公司 | Mechanical stamping easy-die-changing device and using method |
| CN211707871U (en) * | 2020-03-04 | 2020-10-20 | 嘉兴亿豪新材料股份有限公司 | Perforating device for aluminum gusset plate |
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| CN112958690A (en) | 2021-06-15 |
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Effective date of registration: 20220929 Address after: 437000 Economic Development Zone, Xian'an District, Xianning City, Hubei Province Applicant after: HUBEI ZHONGGANG METAL MANUFACTURING CO.,LTD. Address before: Shupu Zhen Liu Li Ji Zhen, Haiyan County, Jiaxing City, Zhejiang Province Applicant before: Jiaxing Yihao New Materials Co.,Ltd. |
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