CN111001739A - Thread rolling device with workpiece cleaning function - Google Patents
Thread rolling device with workpiece cleaning function Download PDFInfo
- Publication number
- CN111001739A CN111001739A CN201911327974.XA CN201911327974A CN111001739A CN 111001739 A CN111001739 A CN 111001739A CN 201911327974 A CN201911327974 A CN 201911327974A CN 111001739 A CN111001739 A CN 111001739A
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- CN
- China
- Prior art keywords
- workpiece
- shell
- thread rolling
- sponge
- wheels
- 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.)
- Pending
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 67
- 238000005096 rolling process Methods 0.000 title claims abstract description 54
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 description 9
- 238000010079 rubber tapping Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/04—Making by means of profiled-rolls or die rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/12—Brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/14—Wipes; Absorbent members, e.g. swabs or sponges
- B08B1/143—Wipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/20—Cleaning of moving articles, e.g. of moving webs or of objects on a conveyor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Abstract
The invention discloses a thread rolling device with a workpiece cleaning function, which comprises a thread rolling machine, wherein a cleaning mechanism is arranged at the inlet end of the thread rolling machine, and comprises a shell, a first cleaning component and a second cleaning component; the two side walls of the shell which are back to back are provided with workpiece inlet and outlet holes which are concentrically butted, and a workpiece channel is formed in the shell; the first cleaning component comprises two brush wheels and a first driving part which are arranged in the shell, and the two brush wheels are respectively positioned at two sides of the workpiece channel; the second cleaning assembly comprises two sponge wheels arranged in the shell and a second driving part driving the sponge wheels to rotate, and the two sponge wheels are respectively positioned on two sides of the workpiece channel. The invention can clean the workpieces entering between the thread rolling wheels so as to improve the thread rolling quality of the workpieces and ensure the normal service life of the thread rolling wheels.
Description
Technical Field
The invention relates to a workpiece thread rolling device, in particular to a thread rolling device with a workpiece cleaning function.
Background
The thread rolling machine is used for rolling thread grooves on the surface of a screw rod. The thread rolling machine on the market at present usually includes two thread rolling wheels and is used for controlling the drive arrangement of thread rolling wheel pivoted, leaves the gap between two thread rolling wheels, supplies the product entering of treating processing, thereby when the work piece enters into between two thread rolling wheels, two thread rolling wheels rotate for the work piece and realize treating the surface of processing the product and carry out the tapping.
During tapping of a workpiece, impurities tend to adhere to the surface of the workpiece and are fed into the space between the two rolling dies along with the workpiece. However, when the impurities are hard, the quality of tapping the workpiece by the thread rolling wheel is affected, and the workpiece or the thread rolling groove of the thread rolling wheel is damaged.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a thread rolling device with a workpiece cleaning function, which can clean workpieces entering between thread rolling wheels so as to improve the thread rolling quality of the workpieces and ensure the normal service life of the thread rolling wheels.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a thread rolling device with work piece clearance function, includes thread rolling machine, characterized by: the inlet end of the thread rolling machine is provided with a cleaning mechanism, and the cleaning mechanism comprises a shell, a first cleaning assembly and a second cleaning assembly;
the two side walls of the shell, which are back to back, are provided with workpiece inlet and outlet holes, the two workpiece inlet and outlet holes are concentrically butted, and a workpiece channel is formed in the shell;
the first cleaning assembly comprises two brush wheels arranged in the shell and a first driving part for driving the brush wheels to rotate, the two brush wheels are respectively positioned at two sides of the workpiece channel, and brushes on the brush wheels can be contacted with the workpiece passing through the workpiece channel;
the second cleaning assembly comprises two sponge wheels arranged in the shell and a second driving part driving the sponge wheels to rotate, the two sponge wheels are respectively positioned on two sides of the workpiece channel, and the sponge of each sponge wheel can be in contact with the workpiece passing through the workpiece channel.
Preferably, the first cleaning assembly and the second cleaning assembly further comprise a slide rail, a slide block, an adjusting rod and a locking nut;
the extending direction of the slide rail is vertical to the workpiece channel, the first end of the slide rail is fixed on the inner wall of the shell, and the second end of the slide rail extends towards the workpiece channel;
the sliding block is matched on the sliding rail in a sliding mode, and the first driving part, the brush wheel or the second driving part and the sponge wheel are arranged on the sliding block;
the first end of the adjusting rod is connected to the sliding block, and the second end of the adjusting rod penetrates through the side wall of the shell and is positioned outside the shell;
the locking nuts are provided with two locking nuts, are in threaded fit with the adjusting rods and are positioned on two sides of the side wall of the shell.
Preferably, in the first cleaning assembly, the first driving part is positioned on the upper surface of the sliding block, and the brush wheel is positioned on the lower surface of the sliding block; in the second cleaning assembly, the second driving part is positioned on the upper surface of the sliding block, and the sponge wheel is positioned on the lower surface of the sliding block.
Preferably, the upper surfaces of the sliding blocks in the first cleaning assembly and the second cleaning assembly are provided with protective covers, and the first driving part and the second driving part are located in the protective covers.
Preferably, the brush wheel comprises a first wheel body and a brush sleeve sleeved on the first wheel body.
Preferably, the sponge wheel comprises a second wheel body and a sponge sleeve sleeved on the second wheel body.
Preferably, the sponge sleeve is provided with a semicircular ring groove on the outer side wall.
Preferably, the housing comprises an upper cover, a shell and a receiving hopper; the upper opening and the lower opening of the shell are arranged; the upper cover covers the upper opening of the shell, and the material receiving hopper is arranged on the lower opening of the shell.
The invention has the advantages that: the workpiece passes through the cleaning mechanism before entering the two thread rolling wheels of the thread rolling machine, and is cleaned by the first cleaning assembly and the second cleaning assembly, so that impurities on the surface of the workpiece are removed, the cleanliness of the workpiece entering the thread rolling machine is improved, the quality of tapping the workpiece by the thread rolling wheels is improved, and meanwhile, the problem that the workpiece and the thread rolling wheels are damaged can be avoided.
Drawings
Fig. 1 is a bottom view of a thread rolling device with a workpiece cleaning function according to the present embodiment;
fig. 2 is a schematic view of a first cleaning assembly and a second cleaning assembly provided in this embodiment inside a housing.
Detailed Description
The thread rolling device with workpiece cleaning function of the present invention will be further described with reference to fig. 1 to 2.
A thread rolling device with a workpiece cleaning function comprises a thread rolling machine 10 and is characterized in that: a cleaning mechanism 20 is mounted on the inlet end of the thread rolling machine 10 through bolts, and the cleaning mechanism 20 comprises a shell 2, a first cleaning assembly and a second cleaning assembly.
Two side walls of the shell 2, which are opposite to each other, are provided with workpiece inlet and outlet holes 221, the two workpiece inlet and outlet holes 221 are concentrically butted, a workpiece channel 24 is formed in the shell 2, and the workpiece channel is butted with a thread rolling channel of the thread rolling machine 10.
The first cleaning assembly comprises two brush wheels 31 arranged in the shell 2 and a first driving part 38 driving the brush wheels 31 to rotate, the two brush wheels 31 are respectively positioned at two sides of a workpiece channel in a horizontal state, and brushes on the brush wheels 31 can be in contact with a workpiece 5 passing through the workpiece channel.
The second cleaning component comprises two sponge wheels 41 arranged in the shell 2 and a second driving part 42 driving the sponge wheels 41 to rotate, the two sponge wheels 41 are horizontally positioned on two sides of the workpiece channel respectively, and the sponge of the sponge wheels 41 can be in contact with the workpiece passing through the workpiece channel.
The first drive member 38 and the second drive member 42 are each motors.
In actual operation, a workpiece 5 firstly passes through a workpiece channel and then enters the thread rolling machine 10, when the workpiece passes through the workpiece channel, the workpiece 5 is in contact with brushes on the brush wheels 31 positioned at two sides of the workpiece channel, and meanwhile, the brush wheels 31 are driven by the first driving part 38 to rotate, so that the brushes realize the effect of cleaning the surface of the workpiece, and impurities on the surface of the workpiece are swept; after the workpiece is cleaned by the brush, the workpiece is contacted with the sponge on the sponge wheel 41, and the sponge wheel 41 rotates relative to the workpiece, so that the wiping effect on the surface of the workpiece is realized, and impurities on the surface of the workpiece are further removed. And after being cleaned by the first cleaning assembly and the second cleaning assembly, the workpiece enters the thread rolling machine for tapping operation. Above-mentioned in-process, the impurity on its surface is effectively got rid of before the tapping of work piece 5, is showing the quality that has promoted the work piece tapping, has avoided the harder impurity of texture to damage the problem of thread rolling wheel and work piece simultaneously.
The embodiment is further configured as follows: the first cleaning assembly and the second cleaning assembly further comprise a slide rail 32, a slide block 35, an adjusting rod 33 and a locking nut 34.
The extending direction of the slide rail 32 is perpendicular to the workpiece channel, and a first end of the slide rail 32 is welded and fixed on the inner wall of the shell 2, and a second end extends towards the workpiece channel; in this embodiment, each set of slide rails 32 is formed by two L-shaped guide rails.
The slide block 35 is slidably fitted to the slide rail 32, and the first driving member 38, the brush wheel 31 or the second driving member 42, and the sponge wheel 41 are mounted on the slide block 35.
The adjustment lever 33 is connected at a first end to the slider 35 and at a second end through a sidewall of the housing 2 and outside the housing 2.
The locking nuts 34 have two and are screw-fitted to the screw sections of the adjustment rods 33 and are located at both sides of the side wall of the housing 2.
Under the structure, the locking nut 34 is loosened, the adjusting rod 33 can be utilized to drive the sliding block 35 to move relative to the workpiece channel, so that the distance between the brush wheel 31 or the sponge wheel 41 and the workpiece is adjusted, the contact amount between the brush and the sponge and the workpiece is adjusted, the friction force and the cleaning effect can be adjusted, and meanwhile, the cleaning device can be suitable for cleaning workpieces with different sizes; after the locking nut is adjusted to a proper position, the locking nut 34 is only required to be screwed, the operation is convenient, the structure is stable, and the use flexibility of the invention is obviously improved.
The embodiment is further configured as follows: in the first cleaning assembly, the first driving part 38 is positioned on the upper surface of the sliding block 35, and the brush wheel 31 is positioned on the lower surface of the sliding block 35; in the second cleaning assembly, the second driving member 42 is located on the upper surface of the slide block 35, and the sponge wheel 41 is located on the lower surface of the slide block 35. That is, the motor is installed on the upper side of the sliding block 35, the brush wheel 31 or the sponge wheel 41 is located on the lower side of the sliding block 35, the upper end of the rotating shaft of the brush wheel 31 or the sponge wheel 41 penetrates through the sliding block 35 and is located on the upper side of the sliding block 35, and the output shaft of the motor is connected with the rotating shaft of the brush wheel 31 or the sponge wheel 41 through a gear set so as to drive the brush wheel 31 or the sponge wheel 41 to rotate. With the structure, the problem that the swept or scraped impurities fall onto the first driving component 38 or the second driving component 42 to influence the normal work of the first driving component 38 and the second driving component 42 can be avoided, and the design and use rationality of the invention is obviously improved.
The embodiment is further configured as follows: the upper surfaces of the sliding blocks 35 in the first cleaning assembly and the second cleaning assembly are respectively provided with a protective cover 37, and the first driving part 38 and the second driving part 42 are positioned in the protective cover 37, namely the motors are arranged in the protective cover 37 in an inverted state. This protection casing 37 can further play the guard action to motor and gear train, is showing the stability that promotes the motor and drive brush wheel 31 or sponge wheel 41 pivoted.
The embodiment is further configured as follows: the brush wheel 31 includes a first wheel body and a brush sleeve 311 sleeved on the first wheel body, and the first wheel body and the brush sleeve 311 are fastened by bolts. Under this structure, can dismantle the connection, the change of the brush cover 311 of being convenient for.
The embodiment is further configured as follows: the sponge wheel 41 includes a second wheel body and a sponge sleeve 411 sleeved on the second wheel body, and is fixed by bolts. This structure can facilitate the replacement of the sponge case 411.
The embodiment is further configured as follows: the outer side wall of the sponge sleeve 411 is provided with a semicircular ring groove 4111. Under this structure, the semicircular ring grooves 4111 of the two sponge sleeves 411 can be in contact with the circumference of the whole workpiece 5, so that the 360-degree wiping effect on the workpiece is realized.
The embodiment is further configured as follows: the shell 2 comprises an upper cover 21, a shell 22 and a receiving hopper 23; the shell 22 is provided with an upper opening and a lower opening; the upper cover 21 covers the upper opening of the housing 22, and the receiving hopper 23 is disposed on the lower opening of the housing 22. The upper opening and the upper cover 21 are arranged, so that the inside of the shell 2 can be conveniently observed, and meanwhile, the maintenance of components is facilitated; the lower opening and the receiving hopper 23 are arranged, so that impurities can be collected and can be transferred and processed in time.
Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. The utility model provides a thread rolling device with work piece clearance function, includes thread rolling machine, characterized by: the inlet end of the thread rolling machine is provided with a cleaning mechanism, and the cleaning mechanism comprises a shell, a first cleaning assembly and a second cleaning assembly;
the two side walls of the shell, which are back to back, are provided with workpiece inlet and outlet holes, the two workpiece inlet and outlet holes are concentrically butted, and a workpiece channel is formed in the shell;
the first cleaning assembly comprises two brush wheels arranged in the shell and a first driving part for driving the brush wheels to rotate, the two brush wheels are respectively positioned at two sides of the workpiece channel, and brushes on the brush wheels can be contacted with the workpiece passing through the workpiece channel;
the second cleaning assembly comprises two sponge wheels arranged in the shell and a second driving part driving the sponge wheels to rotate, the two sponge wheels are respectively positioned on two sides of the workpiece channel, and the sponge of each sponge wheel can be in contact with the workpiece passing through the workpiece channel.
2. The thread rolling device with a workpiece cleaning function according to claim 1, wherein: the first cleaning assembly and the second cleaning assembly also comprise slide rails, slide blocks, adjusting rods and locking nuts;
the extending direction of the slide rail is vertical to the workpiece channel, the first end of the slide rail is fixed on the inner wall of the shell, and the second end of the slide rail extends towards the workpiece channel;
the sliding block is matched on the sliding rail in a sliding mode, and the first driving part, the brush wheel or the second driving part and the sponge wheel are arranged on the sliding block;
the first end of the adjusting rod is connected to the sliding block, and the second end of the adjusting rod penetrates through the side wall of the shell and is positioned outside the shell;
the locking nuts are provided with two locking nuts, are in threaded fit with the adjusting rods and are positioned on two sides of the side wall of the shell.
3. The thread rolling device with a workpiece cleaning function according to claim 2, wherein: in the first cleaning assembly, the first driving part is positioned on the upper surface of the sliding block, and the brush wheel is positioned on the lower surface of the sliding block; in the second cleaning assembly, the second driving part is positioned on the upper surface of the sliding block, and the sponge wheel is positioned on the lower surface of the sliding block.
4. The thread rolling device with a workpiece cleaning function according to claim 2, wherein: the upper surfaces of the sliding blocks in the first cleaning assembly and the second cleaning assembly are provided with protective covers, and the first driving part and the second driving part are located in the protective covers.
5. The thread rolling device with a workpiece cleaning function according to claim 1, wherein: the brush wheel comprises a first wheel body and a brush sleeve sleeved on the first wheel body.
6. The thread rolling device with a workpiece cleaning function according to claim 1, wherein: the sponge wheel comprises a second wheel body and a sponge sleeve sleeved on the second wheel body.
7. The thread rolling device with a workpiece cleaning function according to claim 6, wherein: the outer side wall of the sponge sleeve is provided with a semicircular ring groove.
8. The thread rolling device with a workpiece cleaning function according to claim 1, wherein: the shell comprises an upper cover, a shell and a receiving hopper; the upper opening and the lower opening of the shell are arranged; the upper cover covers the upper opening of the shell, and the material receiving hopper is arranged on the lower opening of the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911327974.XA CN111001739A (en) | 2019-12-20 | 2019-12-20 | Thread rolling device with workpiece cleaning function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911327974.XA CN111001739A (en) | 2019-12-20 | 2019-12-20 | Thread rolling device with workpiece cleaning function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111001739A true CN111001739A (en) | 2020-04-14 |
Family
ID=70117081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911327974.XA Pending CN111001739A (en) | 2019-12-20 | 2019-12-20 | Thread rolling device with workpiece cleaning function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111001739A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111871884A (en) * | 2020-08-03 | 2020-11-03 | 嘉兴固达金属科技股份有限公司 | Impurity removing device for surface of rod material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206373452U (en) * | 2016-12-02 | 2017-08-04 | 中航动力株洲航空零部件制造有限公司 | Screw thread process device |
| CN207086411U (en) * | 2017-06-29 | 2018-03-13 | 泉州华中科技大学智能制造研究院 | A kind of foxing dust arrester |
| CN108746442A (en) * | 2018-05-31 | 2018-11-06 | 河北伦柯贸易有限公司 | Thread forming unit and end reinforced thread cutting machine |
| CN109022688A (en) * | 2018-08-10 | 2018-12-18 | 杭州市机械科学研究院有限公司 | Hollow bolt processing method and hollow bolt pressure are quenched machine |
| CN208613126U (en) * | 2018-06-19 | 2019-03-19 | 焦作市高招镁合金有限公司 | A kind of magnesium alloy plate cleaning device for surface |
| CN208696187U (en) * | 2018-08-24 | 2019-04-05 | 森冈精机（南通）有限公司 | A kind of thread rolling machine making plurality of specifications screw thread |
-
2019
- 2019-12-20 CN CN201911327974.XA patent/CN111001739A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206373452U (en) * | 2016-12-02 | 2017-08-04 | 中航动力株洲航空零部件制造有限公司 | Screw thread process device |
| CN207086411U (en) * | 2017-06-29 | 2018-03-13 | 泉州华中科技大学智能制造研究院 | A kind of foxing dust arrester |
| CN108746442A (en) * | 2018-05-31 | 2018-11-06 | 河北伦柯贸易有限公司 | Thread forming unit and end reinforced thread cutting machine |
| CN208613126U (en) * | 2018-06-19 | 2019-03-19 | 焦作市高招镁合金有限公司 | A kind of magnesium alloy plate cleaning device for surface |
| CN109022688A (en) * | 2018-08-10 | 2018-12-18 | 杭州市机械科学研究院有限公司 | Hollow bolt processing method and hollow bolt pressure are quenched machine |
| CN208696187U (en) * | 2018-08-24 | 2019-04-05 | 森冈精机（南通）有限公司 | A kind of thread rolling machine making plurality of specifications screw thread |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111871884A (en) * | 2020-08-03 | 2020-11-03 | 嘉兴固达金属科技股份有限公司 | Impurity removing device for surface of rod material |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: No.1, Jinlu Road, Qinshan Industrial Park, Haiyan, Jiaxing, Zhejiang 314000 Applicant after: Jiaxing Kaixin Hardware Technology Co.,Ltd. Address before: No.1, Jinlu Road, Qinshan Industrial Park, Haiyan, Jiaxing, Zhejiang 314000 Applicant before: Haiyan ronghua Standard Parts Co.,Ltd. |
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Application publication date: 20200414 |
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| RJ01 | Rejection of invention patent application after publication |