CN110626751A - Dustproof feeding device in para-ester production process - Google Patents
Dustproof feeding device in para-ester production process Download PDFInfo
- Publication number
- CN110626751A CN110626751A CN201910911906.1A CN201910911906A CN110626751A CN 110626751 A CN110626751 A CN 110626751A CN 201910911906 A CN201910911906 A CN 201910911906A CN 110626751 A CN110626751 A CN 110626751A
- Authority
- CN
- China
- Prior art keywords
- fixedly connected
- dustproof
- production process
- para
- ester production
- 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
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G21/00—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
- B65G21/08—Protective roofs or arch supports therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G45/00—Lubricating, cleaning, or clearing devices
- B65G45/10—Cleaning devices
- B65G45/18—Cleaning devices comprising brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/02—Devices for feeding articles or materials to conveyors
- B65G47/16—Devices for feeding articles or materials to conveyors for feeding materials in bulk
- B65G47/18—Arrangements or applications of hoppers or chutes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/74—Feeding, transfer, or discharging devices of particular kinds or types
- B65G47/82—Rotary or reciprocating members for direct action on articles or materials, e.g. pushers, rakes, shovels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
- B65G69/18—Preventing escape of dust
- B65G69/181—Preventing escape of dust by means of sealed systems
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
The invention discloses a dustproof feeding device in a para-ester production process, which relates to the technical field of para-ester production equipment, and particularly relates to a dustproof feeding device in a para-ester production process. This dustproof material feeding unit in counterpoint ester production process, through the setting up of scraper blade make the material above the device conveyer belt get into the flash tank as far as possible completely, through driving motor, the eccentric shaft, eccentric block, supporting spring, and the cooperation setting of connecting plate, driving motor drives the eccentric shaft and rotates, and eccentric block drives the eccentric shaft and rocks the effect that makes out the hopper and can produce the shake, makes the ejection of compact thoroughly in the hopper, has played the effect that makes the device ejection of compact pay-off more complete.
Description
Technical Field
The invention relates to the technical field of para-ester production equipment, in particular to a dustproof feeding device in a para-ester production process.
Background
Para-ester is an important intermediate of reactive dyes, is used for synthesizing EF type, KN type, M/KM type, ME type and other vinyl sulfone group-containing reactive dyes, the reactive dyes become the second major dye variety in China at present, and are in a trend of rapid development, and the demand of para-ester is increased year by year.
At present, in counterpoint ester production process, often need carry the material after the suction filtration to flash distillation equipment, current transport mode is to shovel the hopper case through the artifical material after with the suction filtration, then carries flash distillation equipment's feed inlet through the manual work again to add the material into flash distillation equipment through the manual work. It has the problems of time and labor waste, low efficiency, poor dustproof effect and the like.
The utility model discloses a material feeding unit is used in ester production of dustproof counterpoint disclosed in chinese utility model patent application publication specification CN 206634694U, though, the device possesses dustproof effect, but, this material feeding unit is used in ester production of dustproof counterpoint, the existence needs manual the play hopper of rocking, the trouble and the not good shortcoming of ejection of compact effect of the ejection of compact to the device's dustproof effect is ideal inadequately.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the dustproof feeding device in the production process of the para-ester, which has the advantages of thorough and convenient discharging, better dustproof effect and the like, and solves the problems in the background art.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a dustproof material feeding unit in counterpoint ester production process, includes out the hopper, it places to go out the hopper slope, and inclination is 10 degrees, the through-hole has been seted up to one side of going out the hopper, rotate through the bearing in the through-hole and be connected with the eccentric shaft, the middle part fixedly connected with eccentric block of eccentric shaft, the one end fixedly connected with link of eccentric shaft, closed U type is installed to one side of link and is detained, one side and the driving motor fixed connection that closed U type was detained, driving motor's lower part is through driving motor frame and base fixed connection, go out the both sides fixedly connected with connecting plate of hopper, the lower fixed surface of connecting plate is connected with the cylinder, supporting spring has been cup jointed to the cylindrical outside, supporting spring's lower extreme passes through supporting seat and base.
Preferably, the outlet end of the discharge hopper is fixedly connected with a connecting pipe, the outlet end of the connecting pipe is sleeved with a dustproof cover, and the lower part of the dustproof cover is fixedly connected with the frame of the conveyor belt.
Preferably, the power end of the conveyor belt is in transmission connection with the motor through a belt, the motor is fixedly connected to the upper surface of the base through a motor base, and the rotating shaft of the driving wheel of the conveyor belt is fixedly connected with the base through a support.
Preferably, the outer part of the rotating shaft at the driven end of the conveyor belt is fixedly connected with a supporting table through a support, and the supporting table is fixedly connected to the upper surface of the base.
Preferably, the two ends of the driven end rotating shaft of the conveyor belt are fixedly connected with scraping plates through supporting frames, and one ends of the scraping plates are tightly attached to the upper surface of the conveyor belt.
Preferably, the driven end of the conveyor belt is inserted into the flash tank, and the flash tank is fixedly connected to the upper surface of the support platform.
Preferably, the position of the upper surface of the base, which is close to the edge, is fixedly connected with a dust cover, one side of the dust cover is inserted with a feed pipe, and one end of the feed pipe is inserted at the upper part of the discharge hopper.
Preferably, the ventilation hole has been seted up at the back of dust cover, the internally mounted in ventilation hole has the dust removal window, the internally mounted in ventilation hole has dust removal fan, the externally mounted in ventilation hole has the apron, the glass window is installed to the both sides of dust cover, the light is installed to the last top wall of dust cover.
Preferably, a safety cover is sleeved outside the eccentric shaft and fixedly connected to one side of the discharge hopper, and an opening is formed in the other side of the safety cover.
Preferably, the inner top wall of the dustproof cover is hinged with a dust removing brush through a hinge, and the cross section of the dust removing brush is the same as the cross section area of the upper surface of the conveying belt.
(III) advantageous effects
Compared with the prior art, the invention provides a dustproof feeding device in the production process of para-ester, which has the following beneficial effects:
1. this dustproof material feeding unit in counterpoint ester production process, through the setting up of scraper blade make the material above the device conveyer belt get into the flash tank as far as possible completely, through driving motor, the eccentric shaft, eccentric block, supporting spring, and the cooperation setting of connecting plate, driving motor drives the eccentric shaft and rotates, and eccentric block drives the eccentric shaft and rocks the effect that makes out the hopper and can produce the shake, makes the ejection of compact thoroughly in the hopper, has played the effect that makes the device ejection of compact pay-off more complete.
2. This dustproof material feeding unit in ester production process counterpoints, through the setting of shield and dust cover, can shelter from the dust and get into, make dustproof material feeding unit in this ester production process counterpoint possess dirt-proof effect, through the dust removal window, the cooperation setting of dust removal fan and apron can open the apron at suitable opportunity, dust removal fan can carry out powerful dust removal to the device is inside, the dust removal brush can clean dust debris etc. above the conveying belt, the better purpose of dust removal effect has been reached.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic side view of a discharge hopper according to the present invention;
FIG. 3 is a schematic structural diagram of an eccentric shaft and an eccentric block of the discharge hopper according to the present invention;
FIG. 4 is an enlarged schematic view of the structure at A in FIG. 1 according to the present invention;
FIG. 5 is an enlarged schematic view of the structure at B in FIG. 1 according to the present invention;
fig. 6 is a schematic cross-sectional structural view of a dust cap according to the present invention.
In the figure: 1. a discharge hopper; 2. an eccentric shaft; 3. an eccentric block; 4. a connecting frame; 5. closing the U-shaped buckle; 6. a drive motor; 7. a base; 8. a connecting plate; 9. a support spring; 10. a connecting pipe; 11. a dust cover; 12. a conveyor belt; 13. an electric motor; 14. a motor base; 15. a driven end rotating shaft; 16. a support table; 17. a squeegee; 18. a flash tank; 19. a dust cover; 20. a feed pipe; 21. a dust removal window; 22. a dust removal fan; 23. a glass window; 24. an illuminating lamp; 25. a safety cover; 26. a dust removing brush.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the present invention provides a technical solution: a dustproof feeding device in the production process of para-ester comprises a discharge hopper 1, wherein the discharge hopper 1 is obliquely arranged, the inclination angle is 10 degrees, the outlet end of the discharge hopper 1 is fixedly connected with a connecting pipe 10, the outlet end of the connecting pipe 10 is sleeved with a dustproof cover 11, the inner top wall of the dustproof cover 11 is hinged with a dedusting brush 26 through a hinge, the cross section of the dedusting brush 26 is the same as the cross section area of the upper surface of a conveyor belt 12, the lower part of the dustproof cover 11 is fixedly connected with the frame of the conveyor belt 12, the driven end of the conveyor belt 12 is inserted into a flash tank 18, the flash tank 18 is fixedly connected with the upper surface of a support table 16, the power end of the conveyor belt 12 is in transmission connection with a motor 13 through a belt, the motor 13 is fixedly connected with the upper surface of a base 7 through a motor base 14, the driving wheel rotating shaft of, the driven end of the conveyor belt 12 is provided with a rotating shaft 15, the outer part of the rotating shaft 15 is fixedly connected with a supporting table 16 through a support, the supporting table 16 is fixedly connected with the upper surface of the base 7, the position of the upper surface of the base 7, which is close to the edge, is fixedly connected with a dust cover 19, one side of the dust cover 19 is inserted with a feeding pipe 20, two sides of the dust cover 19 are provided with glass windows 23, the upper top wall of the dust cover 19 is provided with a lighting lamp 24, the back surface of the dust cover 19 is provided with a vent hole, a dust removing window 21 is arranged inside the vent hole, a dust removing fan 22 is arranged inside the vent hole, and the dust-proof feeding device in the para-oriented ester production process can shield dust from entering through the arrangement of the dust cover 11 and the dust cover 19, so that the dust-proof feeding, the dust removal device comprises a dust removal fan 22 and a cover plate, wherein the cover plate can be opened at a proper time, the dust removal fan 22 can remove dust in the device in a powerful manner, a dust removal brush 26 can clean dust and sundries on a conveying belt 12, the dust removal effect is better, the cover plate is arranged outside a vent hole, one end of a feed pipe 20 is inserted into the upper part of a discharge hopper 1, two ends of a rotating shaft 15 are fixedly connected with a scraping plate 17 through a supporting frame, one end of the scraping plate 17 is tightly attached to the upper surface of the conveying belt 12, one side of the discharge hopper 1 is provided with a through hole, an eccentric shaft 2 is rotatably connected in the through hole through a bearing, the outer part of the eccentric shaft 2 is sleeved with a safety cover 25, one side of the safety cover 25 is fixedly connected to one side of the discharge hopper 1, the other side of the safety cover 25 is provided with an opening which is, one end of the eccentric shaft 2 is fixedly connected with a connecting frame 4, one side of the connecting frame 4 is provided with a closed U-shaped buckle 5, one side of the closed U-shaped buckle is fixedly connected with a driving motor 6, the lower part of the driving motor 6 is fixedly connected with a base 7 through a driving motor frame, two sides of the discharge hopper 1 are fixedly connected with connecting plates 8, the lower surface of each connecting plate 8 is fixedly connected with a cylinder, the outer part of each cylinder is sleeved with a supporting spring 9, the dustproof feeding device in the production process of para-ester enables materials on a conveyor belt of the device to enter a flash tank as completely as possible through the arrangement of a scraper 17, the driving motor 6, the eccentric shaft 2, an eccentric block 3, the supporting spring 9 and the connecting plates 8 are arranged in a matched mode, the driving motor 6 drives the eccentric shaft 2 to rotate, and the eccentric block 3 drives the eccentric shaft 2 to shake so, the discharging hopper is enabled to discharge the materials thoroughly, the discharging and feeding functions of the device are achieved more completely, and the lower end of the supporting spring 9 is fixedly connected with the base 7 through the supporting seat.
The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.
When using, the material of last flow gets into out hopper 1 through inlet pipe 20, go out hopper 1 vibrations ejection of compact and send into conveyer belt 12 with the material, the material is sent into flash tank 18 through conveyer belt 12 in, scraper blade 17 scrapes the material of adhesion on conveyer belt 12 into flash tank 18 in, be sealed setting at inlet pipe 20 and the junction of going out hopper 1, there is sealed lid above the conveyer belt, guarantee the dustproof effect in the transfer process, and protection casing 19 also plays dustproof effect to the device, dust exhausting fan 22 also can remove dust to the device is inside.
In conclusion, the dustproof feeding device in the production process of the para-position ester enables materials on a conveyor belt of the device to completely enter a flash tank as much as possible through the arrangement of the scraper 17, the driving motor 6 drives the eccentric shaft 2 to rotate through the matching arrangement of the driving motor 6, the eccentric shaft 2, the eccentric block 3, the supporting spring 9 and the connecting plate 8, the eccentric block 3 drives the eccentric shaft 2 to rock so that the discharge hopper can generate a shaking effect, the discharge in the discharge hopper is thorough, the discharging and feeding of the device are more complete, the dust can be shielded from entering through the arrangement of the dustproof cover 11 and the dustproof cover 19, the dustproof feeding device in the production process of the para-position ester has a dustproof effect, the cover plate can be opened at a proper time through the matching arrangement of the dustproof window 21, the dedusting fan 22 and the cover plate, and the dedusting fan 22 can perform strong dust removal on the interior of the device, the dust removing brush 26 can clean dust, impurities and the like on the conveying belt 12, and the purpose of better dust removing effect is achieved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a dustproof material feeding unit in ester production process counterpoints, includes out hopper (1), its characterized in that: the discharge hopper (1) is obliquely arranged, the inclination angle is 10 degrees, one side of the discharge hopper (1) is provided with a through hole, an eccentric shaft (2) is rotatably connected in the through hole through a bearing, an eccentric block (3) is fixedly connected in the middle of the eccentric shaft (2), one end of the eccentric shaft (2) is fixedly connected with a connecting frame (4), one side of the connecting frame (4) is provided with a closed U-shaped buckle (5), one side of the closed U-shaped buckle is fixedly connected with a driving motor (6), the lower part of the driving motor (6) is fixedly connected with a base (7) through a driving motor frame, two sides of the discharge hopper (1) are fixedly connected with connecting plates (8), the lower surfaces of the connecting plates (8) are fixedly connected with cylinders, the supporting spring (9) is sleeved outside the cylinder, and the lower end of the supporting spring (9) is fixedly connected with the base (7) through the supporting seat.
2. The dustproof feeding device in the para-ester production process according to claim 1, which is characterized in that: the outlet end of the discharge hopper (1) is fixedly connected with a connecting pipe (10), the outlet end of the connecting pipe (10) is sleeved with a dustproof cover (11), and the lower part of the dustproof cover (11) is fixedly connected with the frame of the conveyor belt (12).
3. The dustproof feeding device in the para-ester production process according to claim 2, characterized in that: the power end of conveyer belt (12) passes through the belt and is connected with motor (13) transmission, motor (13) pass through motor cabinet (14) fixed connection in the upper surface of base (7), the action wheel pivot of conveyer belt (12) passes through support and base (7) fixed connection.
4. The dustproof feeding device in the para-ester production process according to claim 2, characterized in that: the driven end of conveyer belt (12) is installed pivot (15), the outside of pivot (15) is through support and brace table (16) fixed connection, brace table (16) fixed connection is in the upper surface of base (7).
5. The dustproof feeding device in the para-ester production process according to claim 3, characterized in that: the both ends of pivot (15) are through support frame fixedly connected with scraper blade (17), the upper surface of conveyer belt (12) is hugged closely to the one end of scraper blade (17).
6. The dustproof feeding device in the para-ester production process according to claim 2, characterized in that: the driven end of the conveyor belt 12 is inserted into the flash tank (18), and the flash tank (18) is fixedly connected to the upper surface of the support platform (16).
7. The dustproof feeding device in the para-ester production process according to claim 1, which is characterized in that: the upper surface of the base (7) is fixedly connected with a dust cover (19) at a position close to the edge, one side of the dust cover (19) is inserted with a feed pipe (20), and one end of the feed pipe (20) is inserted at the upper part of the discharge hopper (1).
8. The dustproof feeding device in the para-ester production process according to claim 7, which is characterized in that: the ventilation hole has been seted up at the back of dust cover (19), the internally mounted in ventilation hole has dust removal window (21), the internally mounted in ventilation hole has dust removal fan (22), the externally mounted in ventilation hole has the apron, glass window (23) are installed to the both sides of dust cover (19), light (24) are installed to the last top wall of dust cover (19).
9. The dustproof feeding device in the para-ester production process according to claim 1, which is characterized in that: the outer part of the eccentric shaft (2) is sleeved with a safety cover (25), the safety cover (25) is fixedly connected to one side of the discharge hopper (1), and the other side of the safety cover (25) is provided with an opening.
10. The dustproof feeding device in the para-ester production process according to claim 2, characterized in that: the inner top wall of the dustproof cover (11) is hinged with a dust removing brush (26) through a hinge, and the cross section of the dust removing brush (26) is the same as the cross section of the upper surface of the conveyor belt (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910911906.1A CN110626751A (en) | 2019-09-25 | 2019-09-25 | Dustproof feeding device in para-ester production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910911906.1A CN110626751A (en) | 2019-09-25 | 2019-09-25 | Dustproof feeding device in para-ester production process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110626751A true CN110626751A (en) | 2019-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910911906.1A Pending CN110626751A (en) | 2019-09-25 | 2019-09-25 | Dustproof feeding device in para-ester production process |
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| Country | Link |
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| CN (1) | CN110626751A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112478775A (en) * | 2020-12-11 | 2021-03-12 | 芜湖精锋园林机械科技有限公司 | Electric saw chain equipment is with shake loading attachment |
| CN113894145A (en) * | 2021-10-09 | 2022-01-07 | 马高伟 | Civil engineering is with environment-friendly construction waste treatment facility |
| CN114715644A (en) * | 2022-05-10 | 2022-07-08 | 青岛宝佳智能装备股份有限公司 | Synchronous centering mechanism of carbon-point |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206634694U (en) * | 2017-07-05 | 2017-11-14 | 内蒙古利元科技有限公司 | A kind of dust protected para-ester production feed device |
| CN108272091A (en) * | 2018-03-02 | 2018-07-13 | 塔里木大学 | A kind of walnut processing unit (plant) |
| CN208070680U (en) * | 2017-11-29 | 2018-11-09 | 登封市新鑫农科材料有限公司 | A kind of jaw crushing batcher |
| CN109365276A (en) * | 2018-12-13 | 2019-02-22 | 郑州金诚信筛网设备有限公司 | A kind of flour processing vibrating screen |
-
2019
- 2019-09-25 CN CN201910911906.1A patent/CN110626751A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206634694U (en) * | 2017-07-05 | 2017-11-14 | 内蒙古利元科技有限公司 | A kind of dust protected para-ester production feed device |
| CN208070680U (en) * | 2017-11-29 | 2018-11-09 | 登封市新鑫农科材料有限公司 | A kind of jaw crushing batcher |
| CN108272091A (en) * | 2018-03-02 | 2018-07-13 | 塔里木大学 | A kind of walnut processing unit (plant) |
| CN109365276A (en) * | 2018-12-13 | 2019-02-22 | 郑州金诚信筛网设备有限公司 | A kind of flour processing vibrating screen |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112478775A (en) * | 2020-12-11 | 2021-03-12 | 芜湖精锋园林机械科技有限公司 | Electric saw chain equipment is with shake loading attachment |
| CN113894145A (en) * | 2021-10-09 | 2022-01-07 | 马高伟 | Civil engineering is with environment-friendly construction waste treatment facility |
| CN114715644A (en) * | 2022-05-10 | 2022-07-08 | 青岛宝佳智能装备股份有限公司 | Synchronous centering mechanism of carbon-point |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191231 |
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| RJ01 | Rejection of invention patent application after publication |