CN214326347U - Grit conveyer belt with clearance mechanism - Google Patents
Grit conveyer belt with clearance mechanism Download PDFInfo
- Publication number
- CN214326347U CN214326347U CN202120404678.1U CN202120404678U CN214326347U CN 214326347 U CN214326347 U CN 214326347U CN 202120404678 U CN202120404678 U CN 202120404678U CN 214326347 U CN214326347 U CN 214326347U
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- Prior art keywords
- conveyer belt
- brush
- rigid coupling
- support
- worm
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- 230000010405 clearance mechanism Effects 0.000 title claims abstract description 9
- 230000008878 coupling Effects 0.000 claims abstract description 24
- 238000010168 coupling process Methods 0.000 claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 claims abstract description 24
- 239000000428 dust Substances 0.000 claims abstract description 12
- 238000010521 absorption reaction Methods 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 28
- 238000003860 storage Methods 0.000 claims description 16
- 239000004576 sand Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 abstract description 12
- 239000012535 impurity Substances 0.000 abstract description 8
- 238000004064 recycling Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 241001417527 Pempheridae Species 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The utility model relates to a grit conveyer belt with clearance mechanism belongs to the grit and carries technical field, which comprises a bracket, it is connected with the conveyer belt to rotate on the support, it can tend to the activity brush of the lower surface direction motion near the upside conveyer belt to be provided with between corresponding upside conveyer belt and the downside conveyer belt on the support, the activity brush includes that fly leaf one and bolted connection brush hair one on fly leaf one, brush hair one is located the one side of the lower surface near the upside conveyer belt, the downside rigid coupling that corresponds the activity brush on the support has the collecting box, the collecting box is located between upside conveyer belt and the downside conveyer belt, one side rigid coupling of collecting box has the dust absorption pipe, the one end that the collecting box was kept away from to the dust absorption pipe is connected with the dirt subassembly of taking out. The lower surface of conveyer belt can be cleared up to the activity brush that this application set up, starts simultaneously and takes out the dirt subassembly, makes impurity after the clearance get into in the collecting box, and the activity brush can carry out the up-and-down motion moreover, consequently does not hinder the transport work of conveyer belt.
Description
Technical Field
The application relates to the technical field of grit is carried, especially relates to a grit conveyer belt with clearance mechanism.
Background
The grit conveyer belt can often be used in the production process of concrete, and the concrete grit raw materials of stirring are usually stored in the storage hopper, and when needs used, the grit raw materials are discharged from the storage hopper, then carry out follow-up work on transporting to the mixer through the conveyer belt.
The conveyer belt that prior art used, its structure mainly includes the frame, is provided with the conveyer belt in the frame, and the conveyer belt is the slope setting, and general raw materials get into the low one end of conveyer belt, then carry to the eminence through the conveyer belt, carry out subsequent processing work.
To the correlation technique among the above-mentioned, the inventor thinks that the conveyer belt transports the in-process of grit, and the conveyer belt is close to the impurity such as grit of the easy bonding of one side of conveying roller, and the conveyer belt uses the back for a long time, causes the conveyer belt phenomenon of skidding to appear in the transportation, further damages the conveying roller.
SUMMERY OF THE UTILITY MODEL
In order to improve the problem that impurities such as sand and the like indicated in the above-mentioned background art are bonded to the conveying roller, the present application provides a sand and stone conveying belt having a cleaning mechanism.
The application provides a pair of grit conveyer belt with clearance mechanism adopts following technical scheme:
the utility model provides a grit conveyer belt with clearance mechanism, includes the support, it is connected with the conveyer belt to rotate on the support, it can tend to the activity brush of the lower surface direction motion of being close to the upside conveyer belt to be provided with between corresponding upside conveyer belt and the downside conveyer belt on the support to brush, the activity brush includes fly leaf one and the brush hair of bolted connection on fly leaf one, brush hair one is located the one side of the lower surface of being close to the upside conveyer belt, the downside rigid coupling that corresponds the activity brush on the support has the collecting box, the collecting box is located between upside conveyer belt and the downside conveyer belt, one side rigid coupling of collecting box has the dust absorption pipe, the one end that the collecting box was kept away from to the dust absorption pipe is connected with the dirt subassembly of taking out.
Through adopting above-mentioned technical scheme, the activity brush can tend to the lower surface motion that is close to the upside conveyer belt, and then makes a brush hair butt in the lower surface of upside conveyer belt, and the lower surface of conveyer belt can be cleared up to brush hair one, starts the dust extraction subassembly simultaneously, makes the impurity after the clearance get into the collecting box, then carries out centralized processing, and this easy operation can clear up the lower surface of conveyer belt, and then helps the rotation of conveyer belt.
Optionally, a first guide rod and a first lead screw are vertically arranged on two sides of the support corresponding to the conveying belt respectively, the first guide rod is fixedly connected to the support, the first guide rod penetrates through one end of the first movable plate, the first lead screw is rotatably connected to the support, and the first lead screw is connected to one end, away from the first guide rod, of the first movable plate in a threaded manner.
By adopting the technical scheme, the first screw rod is rotated, the first screw rod rotates to drive the first movable plate to move, and the first movable plate moves to drive the first bristles to move, so that the position between the first bristles and the conveying belt is convenient to adjust.
Optionally, the bottom end of the first lead screw penetrates through the support and is fixedly connected with a first worm wheel, one side of the support is fixedly connected with a first servo motor, one side of the support corresponding to the first servo motor is rotatably connected with a first worm, an output shaft of the first servo motor is fixedly connected with the first worm, and the first worm is meshed with the first worm wheel.
By adopting the technical scheme, the first servo motor is started, the first servo motor drives the first worm to rotate, the first worm gear is driven to rotate by the first worm, and the first lead screw is driven to rotate by the first worm gear.
Optionally, a rack is fixedly arranged at one end of the support corresponding to the lower part of the conveying belt, and a cleaning brush capable of moving towards the conveying belt direction is arranged on the rack.
Through adopting above-mentioned technical scheme, the brush cleaner can move to the upper surface of conveyer belt, and then can clean the upper surface of conveyer belt.
Optionally, one side of the frame, which is close to the other side, is vertically provided with a second guide rod and a second guide screw respectively, the second guide rod is fixedly connected to the frame, the second guide screw is rotatably connected to the frame, the second guide rod penetrates through one end of the sweeper brush, and the second guide screw is in threaded connection with the other end of the sweeper brush.
Through adopting above-mentioned technical scheme, rotate lead screw two, the rotation of lead screw two drives the brush cleaner and moves along the axis direction of guide arm two, and then conveniently removes the brush cleaner.
Optionally, a second worm wheel is fixedly connected to the top end of the second lead screw, a second servo motor is fixedly connected to one side of the rack, a second worm is rotatably connected to one side of the rack corresponding to the second servo motor, an output shaft of the second servo motor is fixedly connected to the second worm, and the second worm is meshed with the second worm wheel.
By adopting the technical scheme, the second servo motor is started, the second servo motor drives the second worm to rotate, the second worm drives the second worm wheel to rotate, and the second worm wheel drives the second lead screw to rotate.
Optionally, the downside rigid coupling that the frame corresponds the one end that the conveyer belt is low has the collection box, the rigid coupling has the filter screen in the collection box, one side rigid coupling of collection box has the feed liquor pipe, the other end rigid coupling of feed liquor pipe has the storage water tank, the rigid coupling has the drain pipe that one end corresponds the conveyer belt upside on the storage water tank.
Through adopting above-mentioned technical scheme, the water after cleaning the conveyer belt falls into the collection box in, then makes water get into the storage water tank through filtering, realizes the cyclic utilization of water.
Optionally, one end of the liquid outlet pipe, which is far away from the water storage tank, is fixedly connected with a liquid outlet branch pipe, the axial direction of the liquid outlet branch pipe is parallel to the length direction of the cleaning brush, and one side of the liquid outlet branch pipe, which is close to the cleaning brush, is fixedly connected with a plurality of water outlet hoppers along the axial direction of the liquid outlet branch pipe.
Through adopting above-mentioned technical scheme, go out the upside that the water bucket corresponds the conveyer belt, go out the water bucket and spray water, supplementary brush cleaner washs the conveyer belt.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the lower surface that the conveyer belt can be cleared up to the activity brush that this application set up, starts simultaneously and takes out the dirt subassembly, makes impurity after the clearance get into in the collecting box, then carries out centralized processing, and the activity brush can carry out the up-and-down motion moreover, consequently does not hinder the transport work of conveyer belt, and this easy operation helps the rotation of conveyer belt simultaneously.
2. This application sets up the brush cleaner, and the brush cleaner can clean the upper surface of conveyer belt, and the cleaning of cooperation water improves the cleaning efficiency of conveyer belt moreover.
Drawings
Fig. 1 is a schematic structural diagram of a sand conveyor belt with a cleaning mechanism according to an embodiment of the present application.
Fig. 2 is an enlarged view of a in fig. 1.
Fig. 3 is a schematic structural diagram of a first protruding lead screw of a sand conveyor belt with a cleaning mechanism according to an embodiment of the present application.
Fig. 4 is an enlarged view of B in fig. 3.
Fig. 5 is a structural schematic diagram of a sand and stone conveyer belt salient cleaning brush with a cleaning mechanism according to an embodiment of the application.
Fig. 6 is a schematic structural view of a second highlighted lead screw of the sand conveying belt with the cleaning mechanism in the embodiment of the application.
Fig. 7 is an enlarged view of C in fig. 6.
Description of reference numerals: 1. a support; 11. a rotating roller; 111. a drive motor; 12. a conveyor belt; 13. a movable brush; 131. a first movable plate; 132. brushing one; 14. a first guide rod; 15. a first lead screw; 151. a first worm wheel; 152. a first servo motor; 153. a first worm; 16. a collection box; 161. a dust collection pipe; 162. a dust extraction assembly; 2. a frame; 21. cleaning with a brush; 211. a second movable plate; 212. bristles II; 22. a second guide rod; 23. a second screw rod; 231. a second worm gear; 232. a servo motor II; 233. a second worm; 24. a recycling bin; 241. a filter screen; 242. a liquid inlet pipe; 25. a water storage tank; 251. a liquid outlet pipe; 252. a liquid outlet branch pipe; 253. and (4) a water outlet hopper.
Detailed Description
The present application is described in further detail below with reference to figures 1-7.
The embodiment of the application discloses grit conveyer belt with clearance mechanism.
Referring to fig. 1, a grit conveyer belt with clearance mechanism, including support 1, rotate on support 1 and be connected with a plurality of live-rollers 11, rotate on each live-roller 11 and be connected with conveyer belt 12, one side rigid coupling that support 1 corresponds a live-roller 11 has driving motor 111, and driving motor 111's output shaft rigid coupling is in a live-roller 11, and driving motor 111's output shaft and live-roller 11 coaxial line set up.
Referring to fig. 1 and 2, a movable brush 13 is arranged on a support 1, the movable brush 13 is located between an upper side conveyor belt 12 and a lower side conveyor belt 12, the movable brush 13 includes a first movable plate 131 and first bristles 132 connected to the first movable plate 131 through bolts, the first bristles 132 can move towards the direction close to the lower surface of the upper side conveyor belt 12, a first guide rod 14 and a first lead screw 15 are vertically arranged on two sides of the support 1 corresponding to the conveyor belt 12 respectively, the first guide rod 14 is fixedly connected to the support 1, the first guide rod 14 penetrates through one end of the first movable plate 131, the first lead screw 15 is rotatably connected to the support 1, and the first lead screw 15 is in threaded connection with one end, away from the first guide rod 14, of the first movable plate 131.
Referring to fig. 3 and 4, the bottom end of the first lead screw 15 penetrates through the bracket 1 and is fixedly connected with a first worm wheel 151, the first lead screw 15 and the first worm wheel 151 are coaxially arranged, one side of the bracket 1 is fixedly connected with a first servo motor 152, one side of the bracket 1 corresponding to the first servo motor 152 is rotatably connected with a first worm 153, the output shaft of the first servo motor 152 is fixedly connected with the first worm 153, and the first worm 153 is meshed with the first worm wheel 151.
During operation, the first servo motor 152 is started, the first servo motor 152 drives the first worm 153 to rotate, the first worm 153 rotates to drive the first worm wheel 151 to rotate, the first worm wheel 151 rotates to drive the first lead screw 15 to rotate, the first lead screw 15 rotates to drive the first movable plate 131 to perform sliding movement in the vertical direction, and then the first bristles 132 can abut against the lower surface of the upper side conveying belt 12.
Referring to fig. 1 and 2, a collecting box 16 is fixedly connected to the lower side of the bracket 1 corresponding to the movable brush 13, the upper side of the collecting box 16 is open, the collecting box 16 is located between the upper conveyer belt 12 and the lower conveyer belt 12, a dust suction pipe 161 is fixedly connected to one side of the collecting box 16, and one end of the dust suction pipe 161, which is far away from the collecting box 16, is connected with a dust extraction assembly 162.
During operation, first 132 of brush hair on the movable brush 13 butt the lower surface of upside conveyer belt 12 rotates conveyer belt 12, and first 132 of brush hair can clean conveyer belt 12, starts to take out dirt subassembly 162, takes out dirt subassembly 162 and can absorb impurity such as the granule that cleans from movable brush 13, guarantees the clean and tidy of support 1 surrounding environment.
Referring to fig. 5 and 6, a frame 2 is fixedly arranged at one end of the support 1 corresponding to the lower part of the conveying belt 12, a cleaning brush 21 is arranged on the frame 2, the length direction of the cleaning brush 21 is perpendicular to the conveying direction of the conveying belt 12, the cleaning brush 21 comprises a second movable plate 211 and a second brush bristle 212 which is bolted to the second movable plate 211, and the cleaning brush 21 can move towards the direction close to the upper surface of the upper conveying belt 12.
Referring to fig. 6 and 7, a guide rod two 22 and a lead screw two 23 are respectively vertically arranged on one side, close to each other, of the rack 2, the guide rod two 22 is fixedly connected to the rack 2, the lead screw two 23 is rotatably connected to the rack 2, the guide rod two 22 is arranged at one end of the cleaning brush 21 in a penetrating manner, the lead screw two 23 is in threaded connection with the other end of the cleaning brush 21, the top end of the lead screw two 23 is fixedly connected with a worm gear two 231, the lead screw two 23 and the worm gear two 231 are coaxially arranged, a servo motor two 232 is fixedly connected to one side of the rack 2, one side, corresponding to the servo motor two 232, of the rack 2 is rotatably connected with a worm two 233, an output shaft of the servo motor two 232 is fixedly connected to the worm two 233, and the worm two is meshed with the worm two worm 231.
During operation, the second servo motor 232 is started, the second servo motor 232 drives the second worm 233 to rotate, the second worm 233 rotates to drive the second worm wheel 231 to rotate, the second worm wheel 231 rotates to drive the second lead screw 23 to rotate, the second lead screw 23 rotates to drive the cleaning brush 21 to perform sliding motion in the vertical direction, and then the second brush bristles 212 can abut against the upper surface of the upper side conveying belt 12.
Referring to fig. 6, a recycling box 24 is fixedly connected to a lower side of one end of the frame 2 corresponding to the lower side of the conveyor belt 12, an upper side of the recycling box 24 is open, a filter screen 241 is horizontally and fixedly connected to the inside of the recycling box 24, a liquid inlet pipe 242 is fixedly connected to one side of the recycling box 24, a water storage tank 25 is fixedly connected to the other end of the liquid inlet pipe 242, a liquid outlet pipe 251 is fixedly connected to an upper side of the water storage tank 25, a water pump capable of enabling water to enter the liquid outlet pipe 251 is installed between the water storage tank 25 and the liquid outlet pipe 251, a liquid outlet branch pipe 252 is fixedly connected to one end of the liquid outlet pipe 251 far away from the water storage tank 25, the liquid outlet branch pipe 252 is fixedly connected to the frame 2, an axial direction of the liquid outlet branch pipe 252 is parallel to a length direction of the cleaning brush 21, and a plurality of water outlet buckets 253 are fixedly connected to one side of the liquid outlet branch pipe 252 near the cleaning brush 21 along the axial direction of the liquid outlet branch pipe 252.
During operation, the second servo motor 232 is started, the second servo motor 232 drives the cleaning brush 21 to move, the second bristles 212 of the cleaning brush 21 abut against the upper surface of the upper side conveying belt 12, the water pump is started simultaneously, water sequentially passes through the liquid outlet pipe 251 and the liquid outlet branch pipe 252 and then is sprayed onto the conveying belt 12 from the water outlet hopper 253, the cleaning brush 21 is further assisted to clean the conveying belt 12, water and impurities on the cleaning conveying belt 12 fall into the recycling box 24, and after filtering, the water is recycled in the water storage tank 25.
During the concrete implementation, when carrying out the washing of conveyer belt 12, remove movable brush 13, make a brush hair 132 butt lower surface of upside conveyer belt 12, it is specific, start servo motor 152, servo motor 152 drives worm 153 and rotates, and the rotation of worm 153 drives worm wheel 151 and rotates, and the rotation of worm wheel 151 drives lead screw 15 and rotates, and the rotation of lead screw 15 drives fly leaf 131 and carries out the gliding motion of vertical direction, and then makes a brush hair 132 butt lower surface of upside conveyer belt 12.
Meanwhile, the cleaning brush 21 is moved to enable the second bristles 212 to abut against the upper surface of the upper side conveying belt 12, then the water pump is started, specifically, the second servo motor 232 is started, the second servo motor 232 drives the cleaning brush 21 to move, the second bristles 212 of the cleaning brush 21 abut against the upper surface of the upper side conveying belt 12, the water pump is started simultaneously, water sequentially passes through the liquid outlet pipe 251 and the liquid outlet branch pipe 252 and then is sprayed onto the conveying belt 12 from the water outlet hopper 253, the cleaning brush 21 is further assisted to clean the conveying belt 12, water and impurities on the cleaning conveying belt 12 fall into the recycling box 24, after filtration, the water is recycled in the water storage tank 25, and meanwhile, the cleaning work of the upper surface of the conveying belt 12 and the lower surface of the conveying belt 12 is carried out.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a grit conveyer belt with clearance mechanism, includes support (1), it is connected with conveyer belt (12), its characterized in that to rotate on support (1): be provided with movable brush (13) that can tend to be close to the lower surface direction motion of upside conveyer belt (12) on support (1) between corresponding upside conveyer belt (12) and downside conveyer belt (12), movable brush (13) include that fly leaf (131) and bolted connection brush hair (132) on fly leaf (131), brush hair (132) are located the one side of being close to the lower surface of upside conveyer belt (12), the downside rigid coupling that corresponds movable brush (13) on support (1) has collecting box (16), collecting box (16) are located between upside conveyer belt (12) and downside conveyer belt (12), one side rigid coupling of collecting box (16) has dust absorption pipe (161), the one end that collecting box (16) were kept away from in dust absorption pipe (161) is connected with and draws dirt subassembly (162).
2. A sand conveyor belt with a cleaning mechanism as claimed in claim 1, wherein: the two sides of the support (1) corresponding to the conveying belt (12) are respectively and vertically provided with a first guide rod (14) and a first lead screw (15), the first guide rod (14) is fixedly connected to the support (1), the first guide rod (14) penetrates through one end of a first movable plate (131), the first lead screw (15) is rotatably connected to the support (1), and the first lead screw (15) is in threaded connection with one end, far away from the first guide rod (14), of the first movable plate (131).
3. A sand conveyor belt with a cleaning mechanism according to claim 2, wherein: the bottom of lead screw (15) passes support (1) and rigid coupling has worm wheel (151), one side rigid coupling of support (1) has servo motor (152), one side rotation that support (1) corresponds servo motor (152) is connected with worm (153), the output shaft rigid coupling of servo motor (152) is in worm (153), worm (153) mesh in worm wheel (151).
4. A sand conveyor belt with a cleaning mechanism as claimed in claim 1, wherein: the cleaning machine is characterized in that a rack (2) is fixedly arranged at one end, corresponding to the lower part of the conveying belt (12), of the support (1), and a cleaning brush (21) capable of moving towards the direction of the conveying belt (12) is arranged on the rack (2).
5. A sand conveyor belt with a cleaning mechanism according to claim 4, characterised in that: one side of the frame (2) close to each other is vertically provided with a second guide rod (22) and a second guide screw (23) respectively, the second guide rod (22) is fixedly connected to the frame (2), the second guide screw (23) is rotatably connected to the frame (2), the second guide rod (22) penetrates through one end of the cleaning brush (21), and the second guide screw (23) is in threaded connection with the other end of the cleaning brush (21).
6. A sand conveyor belt with a cleaning mechanism according to claim 5, wherein: the top rigid coupling of lead screw two (23) has worm wheel two (231), one side rigid coupling of frame (2) has servo motor two (232), one side rotation that frame (2) corresponds servo motor two (232) is connected with worm two (233), the output shaft rigid coupling of servo motor two (232) is in worm two (233), worm two (233) mesh in worm wheel two (231).
7. A sand conveyor belt with a cleaning mechanism according to claim 4, characterised in that: frame (2) correspond the downside rigid coupling of the one end that conveyer belt (12) are low has collection box (24), the rigid coupling has filter screen (241) in collection box (24), one side rigid coupling of collection box (24) has feed liquor pipe (242), the other end rigid coupling of feed liquor pipe (242) has storage water tank (25), the rigid coupling has drain pipe (251) that one end corresponds conveyer belt (12) upside on storage water tank (25).
8. A sand conveyor belt with a cleaning mechanism according to claim 7, wherein: one end of the liquid outlet pipe (251) far away from the water storage tank (25) is fixedly connected with a liquid outlet branch pipe (252), the axial direction of the liquid outlet branch pipe (252) is parallel to the length direction of the cleaning brush (21), and one side of the liquid outlet branch pipe (252) close to the cleaning brush (21) is fixedly connected with a plurality of water outlet hoppers (253) along the axial direction of the liquid outlet branch pipe (252).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120404678.1U CN214326347U (en) | 2021-02-24 | 2021-02-24 | Grit conveyer belt with clearance mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120404678.1U CN214326347U (en) | 2021-02-24 | 2021-02-24 | Grit conveyer belt with clearance mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214326347U true CN214326347U (en) | 2021-10-01 |
Family
ID=77885416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120404678.1U Expired - Fee Related CN214326347U (en) | 2021-02-24 | 2021-02-24 | Grit conveyer belt with clearance mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214326347U (en) |
-
2021
- 2021-02-24 CN CN202120404678.1U patent/CN214326347U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211001 |