CN110039130B - Hexagonal flange nut tapping device - Google Patents
Hexagonal flange nut tapping device Download PDFInfo
- Publication number
- CN110039130B CN110039130B CN201910484154.5A CN201910484154A CN110039130B CN 110039130 B CN110039130 B CN 110039130B CN 201910484154 A CN201910484154 A CN 201910484154A CN 110039130 B CN110039130 B CN 110039130B
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- CN
- China
- Prior art keywords
- hexagonal flange
- fixed
- flange nut
- electromagnet
- box body
- 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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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/16—Thread cutting; Automatic machines specially designed therefor in holes of workpieces by taps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/44—Equipment or accessories specially designed for machines or devices for thread cutting
-
- 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 discloses a hexagonal flange nut tapping device which comprises a frame, a fixing unit and a tapping unit which are fixed on the top surface of the frame, a scrap removing unit which is fixed on the bottom surface of the frame and a control device which is electrically connected with the fixing unit, the scrap removing unit and the tapping unit, wherein the fixing unit comprises a clamp shell, a limiting block, a first cylinder, a cushion block and a stop block, the scrap removing unit comprises a box body, a spring plate, a switch, a spring, a third electromagnet, a fourth electromagnet, a filter vat and an exhaust fan, repeated clamping of the hexagonal flange nut is not needed, the nut can be continuously fixed, the working efficiency is effectively improved, the spring is compressed by the hexagonal flange nut stacked to a certain weight, and a trigger switch is triggered to enable metal scraps to be pumped away by the exhaust fan in the process of jumping up and down of the hexagonal flange nut.
Description
[ field of technology ]
The invention relates to the technical field of hexagonal flange nuts, in particular to a hexagonal flange nut tapping device.
[ background Art ]
Hexagonal flange nuts, also known as washer nuts, spline nuts, flange nuts, etc., are mostly used in pipe joints or work pieces where the contact surface of the nut needs to be increased. The main precision requirement of the hexagonal flange nut is the perpendicularity requirement between the axis of the inner screw hole and the flange end face, and the perpendicularity between the flange end face of the hexagonal flange nut and the screw tap is ensured in the tapping process. The common processing method is that a lathe is adopted for tapping, in the working process, a worker clamps the hexagonal peripheral surface of the hexagonal flange nut by using a triangular chuck, and then the hexagonal peripheral surface of the hexagonal flange nut is processed by using a tool rest or a tap arranged on a center, but because the problem of improper clamping easily occurs when the hexagonal peripheral surface of the hexagonal flange nut is clamped by using the triangular chuck, the flange end surface of the hexagonal flange nut and the tap are not vertical, and the axis of an inner screw hole of the hexagonal flange nut is not vertical to the flange end surface, the perpendicularity of a product processed by the method is unstable, and each product is processed, the hexagonal flange nut is required to be clamped again on the chuck, and the processing efficiency is lower. In addition, the threaded hole is small in diameter due to tapping, so that metal scraps generated in the threaded hole are not easy to discharge all the time, workers hold the air gun to face the machined threaded hole in a traditional mode, and the metal scraps in the threaded hole are blown out, so that the overall working efficiency is low.
[ invention ]
The invention aims to solve the problems in the prior art, and provides a hexagonal flange nut tapping device which can continuously fix nuts without repeated clamping of the hexagonal flange nuts, so that the working efficiency is effectively improved, and the metal scraps removal efficiency is high.
In order to achieve the above purpose, the invention provides a hexagonal flange nut tapping device, which comprises a frame, a fixing unit and a tapping unit which are fixed on the top surface of the frame, a chip removing unit which is fixed on the bottom surface of the frame, and a control device which is electrically connected with the fixing unit, the chip removing unit and the tapping unit, wherein the fixing unit comprises a clamp shell, a limiting block, a first cylinder, a cushion block and a baffle block, a strip-shaped groove parallel to the central axis is formed on one side plate of the clamp shell, the limiting block is fixed on the top of an inner cavity of the clamp shell and forms a gap with the side plate where the strip-shaped groove is located, the cushion block is fixed on a bump at the lower end of the gap, the baffle block is horizontally moved between the limiting block and the cushion block through the first cylinder, the baffle block is provided with a first electromagnet, the bottom end of the clamp shell is provided with a first opening which is communicated with the inner cavity, the chip removing unit comprises a box body, a spring plate, a switch, a third electromagnet, a fourth electromagnet, a filter drum and an exhaust fan, one end of the spring is fixed on the bottom plate inside the box and the box, the other end of the spring is connected with the spring plate, the side plate is fixed on the bottom plate and the other side plate is fixed on the side plate and the side plate which is respectively.
Preferably, the tapping unit comprises a screw tap, a first motor, a movable frame, a second cylinder and a second motor, wherein the screw tap is fixed on an output shaft of the first motor, the first motor is fixed at the end part of a telescopic rod of the second cylinder, the second cylinder is fixed on the movable frame, and the second motor controls the movable frame to horizontally move along the screw rod through a screw nut.
Preferably, the two sides of the bottom end of the clamp shell are provided with first fixing feet with threaded holes, the two sides of the top end of the box body are provided with second fixing feet with threaded holes, the clamp shell and the box body are respectively fixed on the frame through the first fixing feet and the second fixing feet, and the first opening is communicated with the inner cavity of the box body through a third opening in the frame.
Preferably, second electromagnets are arranged in the side plates of the clamp shell at two sides of the bottom end of the strip-shaped groove.
Preferably, a plurality of ventilation pipelines are arranged in the limiting block, an insertion pipe communicated with the main way of the ventilation pipelines is arranged at the top end of the limiting block, the insertion pipe is connected with a gas pipe of a gas tank, and the gas tank is electrically connected with the control device.
Preferably, a chip storage groove is formed in one side, close to the strip-shaped groove, of the stop block, second openings are formed in the upper side and the lower side of the chip storage groove respectively, and the first electromagnet is arranged around the chip storage groove.
Preferably, a plurality of air supply ports are further arranged on the side plates of the box body.
Preferably, the filter vat is internally provided with a first filter screen, a chip discharging door and a second filter screen, wherein the filter diameter of the first filter screen is positioned between the particle diameter of metal chips and the width of the hexagonal end of the hexagonal flange nut, the filter diameter of the second filter screen is smaller than the particle diameter of the metal chips, and the chip discharging door is positioned between the first filter screen and the second filter screen.
Preferably, the height of the switch is higher than the height of the discharge hole.
Preferably, the third electromagnet and the fourth electromagnet are 2-4 groups and correspond to each other in upper and lower positions one by one.
The invention has the beneficial effects that: according to the invention, a plurality of hexagonal flange nuts are stacked in the clamp shell through the gaps and the strip-shaped grooves, the positions of the nuts before and after machining are limited by the second electromagnet and the stop block, and the first electromagnet is used for giving horizontal acting force to the machined nuts to assist the machined nuts to leave the clamp, so that repeated clamping of the hexagonal flange nuts is not needed, the nuts can be continuously fixed, and the working efficiency is effectively improved; the scrap storage groove is arranged for temporarily storing metal scraps, and the ventilation pipeline is used for conveying gas to remove the metal scraps, so that the blockage in the clamp is avoided; utilize pile up to hexagonal flange nut compression spring of certain weight, trigger switch stops the circular telegram to third electro-magnet and fourth electro-magnet, gets rid of the compression of magnetic force to the spring to make metal sweeps be taken out by the air exhauster at hexagonal flange nut in-process of beating from top to bottom, metal sweeps get rid of efficiently.
The features and advantages of the present invention will be described in detail by way of example with reference to the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a front view of a hexagonal flange nut tapping apparatus of the present invention;
FIG. 2 is a top view of a fixing unit of a hexagonal flange nut tapping apparatus of the present invention;
FIG. 3 is a front cross-sectional view of a fixing unit of a hexagonal flange nut tapping apparatus of the present invention in an operative condition;
FIG. 4 is a front cross-sectional view of another operational condition of a fixing unit of a hexagonal flange nut tapping apparatus of the present invention;
fig. 5 is a front cross-sectional view of a chip removing unit portion of a hexagonal flange nut tapping apparatus of the present invention in operation.
In the figure: 1-frame, 2-fixed unit, 21-clamp housing, 211-first fixed foot, 212-second electromagnet, 213-gap, 214-slot, 215-first opening, 22-stopper, 221-cannula, 222-vent line, 23-first cylinder, 24-cushion, 25-stopper, 251-chip storage slot, 2511-second opening, 252-first electromagnet, 3-chip removing unit, 31-box, 311-second fixed foot, 312-air compensating port, 313-discharge port, 33-spring plate, 34-switch, 35-spring, 36-third electromagnet, 37-fourth electromagnet, 38-filter drum, 381-first filter screen, 382-chip discharging door, 383-second filter screen, 39-exhaust fan, 4-tapping unit, 41-tap, 42-first motor, 43-moving frame, 44-second cylinder, 45-second motor, 5-hexagonal flange nut.
[ detailed description ] of the invention
Referring to fig. 1 to 5, the hexagonal flange nut tapping device of the present invention comprises a frame 1, a fixing unit 2 and a tapping unit 4 fixed on the top surface of the frame 1, a chip removing unit 3 fixed on the bottom surface of the frame 1, and a control device electrically connected with the fixing unit 2, the chip removing unit 3 and the tapping unit 4, wherein the fixing unit 2 comprises a fixture housing 21, a limiting block 22, a first cylinder 23, a cushion block 24 and a stop block 25, a bar-shaped groove 214 parallel to the central axis is arranged on one side plate of the fixture housing 21, the limiting block 22 is fixed on the top of the inner cavity of the fixture housing 21 and forms a gap 213 with the side plate where the bar-shaped groove 214 is located, the cushion block 24 is fixed on a bump at the lower end of the gap 213, the stop block 25 horizontally moves between the limiting block 22 and the cushion block 24 through the first cylinder 23, a first electromagnet 252 is arranged on the stop block 25, the bottom end of the fixture shell 21 is provided with a first opening 215 communicated with an inner cavity, the chip removing unit 3 comprises a box body 31, a spring plate 33, a switch 34, a spring 35, a third electromagnet 36, a fourth electromagnet 37, a filter drum 38 and an exhaust fan 39, one end of the spring 35 is fixed on a bottom plate in the box body 31, the other end of the spring is connected with the spring plate 33, the third electromagnet 36 and the fourth electromagnet 37 are respectively fixed on the bottom plate of the box body 31 and the spring plate 33, the switch 34 is fixed on a side plate of the box body 31, a discharging hole 313 is arranged on a side plate on the other side of the box body 31, the switch 34 and the discharging hole 313 are both positioned below the spring plate 33, the filter drum 38 is fixed on the side plate of the box body 31 and positioned above the spring plate 33, one end of the filter drum 38 is communicated with the inner cavity of the box body 31, the other end of the filter drum 38 is connected with the exhaust fan 39, and the tapping unit 4 comprises a tap 41, the screw tap 41 is fixed on an output shaft of the first motor 42, the first motor 42 is fixed at the end part of a telescopic rod of the second cylinder 44, the second cylinder 44 is fixed on the moving frame 43, the second motor 45 is controlled by a screw nut to move horizontally along the screw rod by the moving frame 43, the two sides of the bottom end of the clamp shell 21 are provided with first fixing feet 211 with threaded holes, the two sides of the top end of the box body 31 are provided with second fixing feet 311 with threaded holes, the clamp shell 21 and the box body 31 are respectively fixed on the frame 1 through the first fixing feet 211 and the second fixing feet 311, the first opening 215 is communicated with the inner cavity of the box body 31 through a third opening on the frame 1, the side plates of the clamp shell 21 positioned at the two sides of the bottom end of the bar groove 214 are provided with second electromagnets 212, a plurality of ventilation pipelines 222 are arranged in the limiting block 22, a cannula 221 communicated with the total path of the ventilation pipelines 222 is arranged at the top end of the limiting block 22, the cannula 221 is connected with a gas pipe of a gas tank, the gas tank is electrically connected with a control device, a chip storage groove 251 is arranged on one side of the stop block 25 close to the strip-shaped groove 214, second openings 2511 are respectively arranged on the upper side and the lower side of the chip storage groove 251, a first electromagnet 252 is arranged around the chip storage groove 251, a plurality of air supply ports 312 are also arranged on the side plate of the box body 31, a first filter screen 381, a chip placing gate 382 and a second filter screen 383 are arranged in the filter barrel 38, the filter diameter of the first filter screen 381 is positioned between the particle diameter of metal chips and the width of the hexagonal end of the hexagonal flange nut 5, the filter diameter of the second filter screen 383 is smaller than the particle diameter of the metal chips, a chip placing gate 382 is positioned between the first filter screen 381 and the second filter screen 383, the height of the switch 34 is higher than that of the discharge hole 313, and the third electromagnet 36 and the fourth electromagnet 37 are 2-4 groups and are in one-to-one correspondence with each other in upper and lower positions.
The working process of the invention comprises the following steps:
in the working process of the hexagonal flange nut tapping device, firstly, the flange end and the hexagonal end of a hexagonal flange nut 5 are respectively plugged into a fixture shell 21 along a gap 213 and a strip-shaped groove 214, when the hexagonal flange nut falls, a second electromagnet 212 is electrified to attract the hexagonal flange nut 5 to avoid falling out of the hexagonal flange nut 5 from a first opening 215 along an inner cavity, and then a plurality of hexagonal flange nuts 5 are stacked in the strip-shaped groove 214 in sequence. Next, the first cylinder 23 pushes the stopper 25 to horizontally move and press the hexagonal flange nut 5 at the lowermost end by the telescopic rod, and the second motor 45 makes the moving frame 43 approach the fixed unit 2 to the left by the screw, the first motor 42 drives the tap 41 to rotate, the second cylinder 44 controls the rotating tap 41 to extend into the central through hole of the hexagonal flange nut 5 by the telescopic rod to tap, and the generated metal scraps are temporarily stored in the scrap storage groove 251 of the stopper 25. After tapping, the first cylinder 23 is restored to the original position through the telescopic rod control stop block 25, in the process, the gas tank conveys gas from the insertion pipe 221 into the limiting block 22, and then metal scraps are blown away from the scrap storage groove 251 along the second opening 2511. When the scraps are completely removed, the first electromagnet 252 is electrified, the second electromagnet 212 is powered off, the tapped hexagonal flange nut 5 is attracted to move towards the side plate at the other end, and then enters the scraps removing unit 3 from the first opening 215 along the inner cavity under the action of gravity. Before the chip removing unit 3 is operated, the third electromagnet 36 and the fourth electromagnet 37 are energized to attract each other, compressing the spring 35 and fixing the spring plate 33 at a distance above the switch 34. After the metal scraps and the hexagonal flange nuts 5 enter the inner cavity of the box body 31 and are gradually stacked to a certain weight, the hexagonal flange nuts 5 compress the springs 35, the spring plates 33 gradually descend and trigger the switch 34, the third electromagnet 36 and the fourth electromagnet 37 are powered off, the elastic force of the springs 35 causes the spring plates 33 to move up and down, and accordingly the hexagonal flange nuts 5 and the metal scraps jump up and down in the inner cavity of the box body 31, the exhaust fan 39 is used for exhausting air in the process, and the metal scraps enter the filter drum 38 through the first filter screen 381 to be stored. After the metal scraps are removed, the third electromagnet 36 and the fourth electromagnet 37 close to the discharge hole 313 are electrified to attract each other, so that the spring plate 33 is in a left-high-right low state, and the decontaminated hexagonal flange nut 5 rolls to the right lower side along the spring plate 33 and finally leaves from the discharge hole 313. When the metal shavings in the filter drum 38 accumulate to a certain amount, the internal metal shavings are removed by the tapping door 382.
According to the invention, a plurality of hexagonal flange nuts are stacked in the clamp shell through the gaps and the strip-shaped grooves, the positions of the nuts before and after machining are limited by the second electromagnet and the stop block, and the first electromagnet is used for giving horizontal acting force to the machined nuts to assist the machined nuts to leave the clamp, so that repeated clamping of the hexagonal flange nuts is not needed, the nuts can be continuously fixed, and the working efficiency is effectively improved; the scrap storage groove is arranged for temporarily storing metal scraps, and the ventilation pipeline is used for conveying gas to remove the metal scraps, so that the blockage in the clamp is avoided; utilize pile up to hexagonal flange nut compression spring of certain weight, trigger switch stops the circular telegram to third electro-magnet and fourth electro-magnet, gets rid of the compression of magnetic force to the spring to make metal sweeps be taken out by the air exhauster at hexagonal flange nut in-process of beating from top to bottom, metal sweeps get rid of efficiently.
The above embodiments are illustrative of the present invention, and not limiting, and any simple modifications of the present invention fall within the scope of the present invention.
Claims (8)
1. The utility model provides a hexagonal flange nut chasing bar which characterized in that: the chip removing device comprises a frame (1), a fixing unit (2) and a tapping unit (4) which are fixed on the top surface of the frame (1), a chip removing unit (3) fixed on the bottom surface of the frame (1) and a control device which is electrically connected with the fixing unit (2), the chip removing unit (3) and the tapping unit (4), wherein the fixing unit (2) comprises a clamp shell (21), a limiting block (22), a first air cylinder (23), a cushion block (24) and a stop block (25), a strip-shaped groove (214) parallel to a central axis is formed in one side plate of the clamp shell (21), the limiting block (22) is fixed on the top of an inner cavity of the clamp shell (21) and forms a gap (213) with the side plate where the strip-shaped groove (214) is located, the stop block (24) is fixed on a bump at the lower end of the gap (213), the stop block (25) is horizontally moved between the limiting block (22) and the stop block (24) through a first air cylinder (23), a first electromagnet (252) is arranged on the stop block (25), a first opening (215) which is communicated with the inner cavity is arranged at the bottom end of the clamp shell (21), the stop block (21) comprises a first opening (215), a third electromagnet (35), a spring plate (36), and a fourth electromagnet (37 The filter vat (38) and the exhaust fan (39), one end of a plurality of springs (35) are fixed on the bottom plate inside the box body (31) and the other end of the springs is connected with the spring plate (33), the third electromagnet (36) and the fourth electromagnet (37) are respectively fixed in the bottom plate of the box body (31) and the spring plate (33), the switch (34) is fixed on the side plate of the box body (31), the side plate on the other side of the box body (31) is provided with the discharge hole (313), the switch (34) and the discharge hole (313) are all positioned below the spring plate (33), the filter vat (38) is fixed on the side plate of the box body (31) and positioned above the spring plate (33), one end of the filter vat (38) is communicated with the inner cavity of the box body (31) and the other end of the spring plate (33), the two sides of the bottom end of the clamp shell (21) are respectively provided with first fixing pins (211) with threaded holes, the two sides of the top end of the box body (31) are respectively provided with second fixing clamps (311) with threaded holes, the first fixing pins (311) are respectively connected with the inner cavity (215) of the first box body (31) and the second fixing pins (215) through the first fixing pins (31) and the first fixing pins (1), and second electromagnets (212) are arranged in the side plates of the clamp shell (21) positioned at the two sides of the bottom end of the strip-shaped groove (214).
2. A hexagonal flange nut tapping apparatus as set forth in claim 1 wherein: tapping unit (4) are including screw tap (41), first motor (42), remove frame (43), second cylinder (44) and second motor (45), screw tap (41) are fixed on the output shaft of first motor (42), telescopic link tip at second cylinder (44) is fixed to first motor (42), second cylinder (44) are fixed on removing frame (43), second motor (45) are through nut control removal frame (43) along lead screw horizontal migration.
3. A hexagonal flange nut tapping apparatus as set forth in claim 1 wherein: a plurality of ventilation pipelines (222) are arranged in the limiting block (22), an insertion pipe (221) communicated with the total path of the ventilation pipelines (222) is arranged at the top end of the limiting block (22), the insertion pipe (221) is connected with the air pipe of the air tank, and the air tank is electrically connected with the control device.
4. A hexagonal flange nut tapping apparatus as set forth in claim 1 wherein: one side of the stop block (25) close to the strip-shaped groove (214) is provided with a chip storage groove (251), the upper side and the lower side of the chip storage groove (251) are respectively provided with a second opening (2511), and the first electromagnet (252) is arranged around the chip storage groove (251).
5. A hexagonal flange nut tapping apparatus as set forth in claim 1 wherein: the side plate of the box body (31) is also provided with a plurality of air supply ports (312).
6. A hexagonal flange nut tapping apparatus as set forth in claim 1 wherein: be equipped with first filter screen (381), put bits door (382) and second filter screen (383) in filter vat (38), the filter diameter of first filter screen (381) is located between the particle diameter of metal clastic and the width of hexagonal end of hexagonal flange nut (5), the filter diameter of second filter screen (383) is less than the particle diameter of metal clastic, put bits door (382) and be located between first filter screen (381) and second filter screen (383).
7. A hexagonal flange nut tapping apparatus as set forth in claim 1 wherein: the height of the switch (34) is higher than that of the discharging hole (313).
8. A hexagonal flange nut tapping apparatus as set forth in claim 1 wherein: the third electromagnet (36) and the fourth electromagnet (37) are 2-4 groups and correspond to each other in the up-down position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910484154.5A CN110039130B (en) | 2019-06-05 | 2019-06-05 | Hexagonal flange nut tapping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910484154.5A CN110039130B (en) | 2019-06-05 | 2019-06-05 | Hexagonal flange nut tapping device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110039130A CN110039130A (en) | 2019-07-23 |
| CN110039130B true CN110039130B (en) | 2023-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910484154.5A Active CN110039130B (en) | 2019-06-05 | 2019-06-05 | Hexagonal flange nut tapping device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110039130B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111774672A (en) * | 2020-04-07 | 2020-10-16 | 安徽枫雅轩科技信息服务有限公司 | Machining equipment for hexagonal flange nut |
| CN116727369B (en) * | 2023-08-15 | 2023-12-22 | 软控联合科技有限公司 | Laser cleaning device for pattern blocks of tire mold |
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| CN110039130A (en) | 2019-07-23 |
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Address after: 314300 No.313, Zhenxing Road, Yucheng Town, Haiyan County, Jiaxing City, Zhejiang Province Applicant after: Sanma fastener (Zhejiang) Co.,Ltd. Address before: 314300 Bazi village, Yucheng Town, Haiyan County, Jiaxing City, Zhejiang Province Applicant before: HAIYAN SANMA STANDARD HARDWARE Co.,Ltd. |
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