CN210821526U - Blackboard capable of being cleaned automatically - Google Patents
Blackboard capable of being cleaned automatically Download PDFInfo
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- CN210821526U CN210821526U CN201921099830.9U CN201921099830U CN210821526U CN 210821526 U CN210821526 U CN 210821526U CN 201921099830 U CN201921099830 U CN 201921099830U CN 210821526 U CN210821526 U CN 210821526U
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- blackboard
- groove
- dustproof pipe
- screw rod
- blackboard eraser
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Abstract
A blackboard capable of being cleaned automatically comprises a blackboard body, wherein the blackboard body is arranged on a wall surface, and a blackboard eraser assembly is vertically pressed on a writing surface of the blackboard body; a first dustproof pipe and a second dustproof pipe are respectively arranged right above and right below the blackboard body, and a first through groove and a second through groove are respectively arranged on the side walls of the first dustproof pipe and the second dustproof pipe along the axial direction of the first dustproof pipe and the second dustproof pipe; a first screw rod and a second screw rod are respectively and rotatably arranged in the first dustproof pipe and the second dustproof pipe, and a first sliding block and a second sliding block are respectively arranged on the first screw rod and the second screw rod in a threaded fit manner; the two ends of the blackboard eraser assembly penetrate through the first through groove and the second through groove respectively and are connected to the first sliding block and the second sliding block respectively. The utility model discloses can effectually erase the typeface on the blackboard, can effectively avoid chalk dust to adhere to on the lead screw motion in a large number and influence lead screw mechanism's normal work simultaneously, guarantee blackboard eraser assembly's normal work, increase the life of the clean structure of whole blackboard eraser.
Description
Technical Field
The utility model relates to a teaching aid field, in particular to but self-cleaning blackboard.
Background
In daily life, the purpose of the blackboard is very wide, and especially, the blackboard is applied to places such as classrooms of schools, scientific research institutions and the like. At present, the work of erasing the blackboard needs to be finished by manpower, and when the blackboard is erased manually, time and labor are wasted due to the resistance effect, and meanwhile, the chalk dust floating in the air can also cause injury to the personnel erasing the blackboard. In order to solve the above problems, related art persons have developed a large number of automatic blackboard erasing apparatuses. The existing automatic blackboard erasing device mainly comprises a first guide rail, a second guide rail and a blackboard eraser, wherein the first guide rail and the second guide rail are arranged on two sides of the surface of a blackboard body in parallel, the blackboard eraser is pressed on the surface of the blackboard body, two ends of the blackboard eraser are respectively connected onto the first guide rail and the second guide rail in a sliding mode, and the blackboard eraser moves left and right/up and down along the surface of the blackboard body under the action of a driving device. For example, the blackboard automatic erasing device disclosed in patent No. CN106881981B and application date 3/21 in 2017 can effectively and quickly erase chalk characters on a blackboard body by driving the blackboard eraser to move in the vertical direction through the driving device, thereby saving time and labor. However, after long-term use, a large amount of chalk dust can be accumulated on the threads of the two screw rods used as the guide rails, the accumulation of the chalk dust can increase the contact friction force at the two ends of the blackboard eraser cleaning assembly in different degrees, so that the advancing speed and the displacement of the two ends of the blackboard eraser cleaning assembly can be influenced in different degrees, when the displacement of the two ends of the blackboard eraser cleaning assembly is relatively large, the normal work of the blackboard eraser cleaning assembly can be influenced to a certain degree, and even the whole blackboard automatic erasing device can be damaged.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the existing problems, the blackboard capable of being cleaned automatically is provided, the characters on the blackboard can be effectively erased, meanwhile, the phenomenon that a large amount of chalk dust is attached to the screw rod movement mechanism to affect the normal work of the screw rod mechanism can be effectively avoided, the normal work of the blackboard eraser assembly is ensured, and the service life of the whole blackboard eraser cleaning structure is prolonged.
The utility model adopts the technical scheme as follows:
a blackboard capable of being cleaned automatically comprises a blackboard body, wherein the blackboard body is arranged on a wall surface, and a blackboard eraser assembly is vertically pressed on a writing surface of the blackboard body; a first dustproof pipe and a second dustproof pipe are respectively arranged right above and right below the blackboard body, and a first through groove and a second through groove are respectively arranged on the side walls of the first dustproof pipe and the second dustproof pipe along the axial direction of the first dustproof pipe and the second dustproof pipe; a first screw rod and a second screw rod are respectively and rotatably arranged in the first dustproof pipe and the second dustproof pipe, and a first sliding block and a second sliding block are respectively arranged on the first screw rod and the second screw rod in a threaded fit manner; the two ends of the blackboard eraser assembly penetrate through the first through groove and the second through groove respectively and are connected to the first sliding block and the second sliding block respectively.
Due to the adoption of the structure, when the blackboard body needs to be cleaned, the blackboard eraser assembly can move left and right along the surface of the blackboard body under the action of the first screw rod and the second screw rod, chalk characters are erased, and the problems that manual blackboard erasing is troublesome, labor-consuming, harmful dust is easy to suck and the like are solved. Simultaneously, first lead screw and second lead screw set up respectively in the first dustproof pipe directly over the blackboard body and the second dustproof pipe directly below, can effectually avoid wiping a large amount of dusts that the blackboard produced and adhere to and pile up on the lead screw, avoid piling up of dust to influence the speed of marcing and the displacement at blackboard eraser subassembly both ends, guarantee the normal work of blackboard eraser subassembly, increase the stability of blackboard eraser subassembly work, increase the life of whole device.
Furthermore, the first through groove is located right above the blackboard body, and the second through groove is located right below the blackboard body.
In the structure, the first through groove and the second through groove are respectively positioned right above and right below the blackboard body, namely the first through groove and the second through groove are both positioned between the vertical plane of the back face (one side face contacted with a wall body) of the blackboard body and the vertical plane of the writing face, so that dust can be effectively prevented from floating into the first dustproof pipe and the second dustproof pipe, and dust accumulation on the first lead screw and the second lead screw is avoided.
Furthermore, the first through groove is positioned on one side of the first dustproof pipe far away from the blackboard body, and the second through groove is positioned on one side of the second dustproof pipe far away from the blackboard body.
Due to the adoption of the structure, the phenomenon that a large amount of dust generated by wiping the blackboard adheres to and is accumulated on the screw rod to influence the movement of the blackboard eraser assembly can be effectively avoided, the normal work of the blackboard eraser assembly is ensured, the working stability of the blackboard eraser assembly is improved, and the service life of the whole device is prolonged.
Furthermore, the first through groove is located on one side, far away from the wall body, of the first dustproof pipe, and the second through groove is located on one side, far away from the wall body, of the second dustproof pipe.
Due to the adoption of the structure, the phenomenon that a large amount of dust generated by wiping the blackboard adheres to and is accumulated on the screw rod to influence the movement of the blackboard eraser assembly can be effectively avoided, the normal work of the blackboard eraser assembly is ensured, the working stability of the blackboard eraser assembly is improved, and the service life of the whole device is prolonged.
Furthermore, the cross section of the first dustproof pipe is circular, and the central angle corresponding to the groove width of the first through groove is not more than
The cross section of the second dustproof pipe is circular, and the central angle corresponding to the groove width of the second through groove is not more than
In the above structure, the width of the first through groove is the opening width of the first through groove, and the width of the second through groove is the opening width of the second through groove.
Further, the blackboard eraser assembly comprises a first cross beam, a second cross beam and a blackboard eraser; two ends of the first cross beam respectively penetrate through the first through groove and the second through groove and are respectively connected to the first sliding block and the second sliding block; the second cross beam is fixedly connected to one side surface, opposite to the blackboard body, of the first cross beam, and a groove is formed in one side surface, opposite to the blackboard body, of the second cross beam along the length direction of the second cross beam; the blackboard eraser is vertically pressed on the writing surface of a blackboard body, a bulge is arranged on the back surface of the blackboard eraser along the length direction of the blackboard eraser, the bulge is arranged in the groove in a matched mode and is connected with the bottom of the groove through a plurality of springs; the spring enables the blackboard eraser to be pressed on the writing surface of the blackboard body.
Due to the adoption of the structure, the brush hair on the blackboard eraser can still be tightly pressed on the surface of the blackboard body after long-term working abrasion, so that the blackboard eraser can effectively work for a long time, and the erasing cleanliness of the blackboard eraser is ensured. The blackboard eraser is pressed on a blackboard body, and one side surface of the blackboard eraser, which is far away from the blackboard body, is the back surface of the blackboard eraser.
Further, the blackboard eraser is vertically pressed on the writing surface of the blackboard body and is fully distributed on the vertical length of the blackboard body; the blackboard eraser comprises a shell, wherein a partition plate is arranged in the shell and divides the interior of the shell into a dust suction cavity and a dust accumulation cavity; the partition board is fixedly provided with a plurality of dust suction fans, and the dust suction fans are used for introducing air in the dust suction cavity into the dust collection cavity; a plurality of groups of bristles are uniformly arranged on the end face, close to one side of the dust suction cavity, of the shell, a plurality of dust suction holes are formed among the plurality of groups of bristles on the side face, and the dust suction holes are communicated with the dust suction cavity.
Due to the adoption of the structure, when the blackboard body needs to be wiped, the blackboard eraser moves left and right under the action of the screw rod to wipe, chalk dust floating in the air enters the blackboard eraser shell through the dust suction hole under the action of the dust suction fan, passes through the dust suction cavity and the dust suction fan and finally deposits at the bottom of the dust collection cavity, so that the phenomenon that a large amount of dust floats in the air to injure teachers and students can be effectively avoided.
Further, an air outlet is formed in the top of the dust accumulation cavity, and a dust filter screen is arranged at the air outlet; the dust collecting cavity is provided with a dust discharging opening at the bottom, and a sealing plug is arranged inside the dust discharging opening.
Due to the adoption of the structure, air sucked into the blackboard eraser can be discharged from the air outlet, and meanwhile, the arrangement of the dust filter screen can prevent the discharged air from bringing dust back to the air; the dust deposited at the bottom of the dust accumulation cavity can be discharged through the dust discharge port.
Furthermore, a first installation box and a first supporting platform are respectively arranged at two ends right above the blackboard body, and two ends of the first dustproof pipe are respectively and fixedly connected to the first installation box and the first supporting platform; a first screw rod is arranged in the first dustproof pipe, and two ends of the first screw rod are respectively and rotatably arranged on the first installation box and the first supporting platform through bearings; the first motor is arranged in the first installation box and connected with the first lead screw to drive the first lead screw to rotate.
Furthermore, a second installation box and a second supporting platform are respectively arranged at two ends right below the blackboard body, and two ends of the second dustproof pipe are respectively and fixedly connected to the second installation box and the second supporting platform; a second screw rod is arranged in the second dustproof pipe, and two ends of the second screw rod are respectively and rotatably arranged on the second installation box and the second supporting platform through bearings; and a second motor is arranged in the second mounting box and connected with the second lead screw to drive the second lead screw to rotate.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. in the utility model, a first dustproof pipe and a second dustproof pipe are respectively arranged right above and below the blackboard body, and a first through groove and a second through groove are respectively arranged on the side walls of the first dustproof pipe and the second dustproof pipe along the axial direction; a first screw rod and a second screw rod are respectively and rotatably arranged in the first dustproof pipe and the second dustproof pipe; the two ends of the blackboard eraser assembly penetrate through the first through groove and the second through groove respectively and are connected to the first screw rod and the second screw rod respectively, so that the blackboard eraser assembly moves left and right along the blackboard body. By adopting the structure, a large amount of dust generated by wiping the blackboard can be effectively prevented from being attached to and accumulated on the screw rod, the influence of accumulation of the dust on the advancing speed and displacement at the two ends of the blackboard eraser assembly is avoided, the normal work of the blackboard eraser assembly is ensured, the working stability of the blackboard eraser assembly is improved, and the service life of the whole device is prolonged.
2. The utility model discloses in, first logical groove is located one side of keeping away from the blackboard body on first dustproof pipe, and the second logical groove is located one side of keeping away from the blackboard body on the second dustproof pipe, can effectually avoid cleaning a large amount of attached accumulations of dust that the blackboard produced on the lead screw and influence the motion of blackboard eraser subassembly, guarantees the normal work of blackboard eraser subassembly, increases the stability of blackboard eraser subassembly work, increases the life of whole device.
Drawings
FIG. 1 is a front view of a self-cleanable blackboard in example 1;
FIG. 2 is a schematic structural view of a first lead screw and a second lead screw in embodiment 1;
FIG. 3 is a side view of the self-cleanable blackboard in example 1;
FIG. 4 is an enlarged view of the structure at A in FIG. 3;
fig. 5 is a transverse sectional view of the blackboard assembly of embodiment 1;
FIG. 6 is a schematic view of a structure of a blackboard eraser according to embodiment 1;
FIG. 7 is a front view of the self-cleanable blackboard in embodiment 2;
FIG. 8 is a schematic structural view of a first lead screw and a second lead screw in embodiment 2;
FIG. 9 is a side view of the self-cleanable blackboard in embodiment 2;
the labels in the figure are: 1-blackboard body, 2-blackboard eraser assembly, 21-blackboard eraser, 211-brush hair, 212-dust suction hole, 213-dust suction cavity, 214-dust collection cavity, 215-dust suction fan, 216-sealing plug, 217-bulge, 218-dust filter screen, 22-first beam, 23-second beam, 24-spring, 31-first screw rod, 32-first slide block, 33-first mounting box, 34-first supporting platform, 35-first dustproof pipe, 351-first through groove, 41-second screw rod, 42-second slide block, 43-second mounting box, 44-second supporting platform, 45-second dustproof pipe and 451-second through groove.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A blackboard capable of self-cleaning is disclosed, as shown in figures 1-4, and comprises a blackboard body 1, wherein the blackboard body 1 is arranged on a wall surface, and a blackboard eraser assembly 2 is vertically pressed on a writing surface of the blackboard body 1; a first dustproof pipe 35 and a second dustproof pipe 45 are respectively arranged right above and right below the blackboard body 1, and a first through groove 351 and a second through groove 451 are respectively arranged on the side walls of the first dustproof pipe 35 and the second dustproof pipe 45 along the axial direction; a first screw rod 31 and a second screw rod 41 are respectively and rotatably arranged in the first dustproof pipe 35 and the second dustproof pipe 45, and a first sliding block 32 and a second sliding block 42 are respectively arranged on the first screw rod 31 and the second screw rod 41 in a threaded fit manner; two ends of the blackboard eraser 21 assembly 2 respectively penetrate through the first through groove 351 and the second through groove 451 and are respectively connected to the first sliding block 32 and the second sliding block 42; when the first screw rod 31 and the second screw rod 41 rotate, the first slider 32 and the second slider 42 respectively move along the length direction of the first screw rod 31 and the second screw rod 41, and the blackboard eraser assembly 2 is driven to move left and right along the surface of the blackboard body 1.
The first through groove 351 is located directly above the blackboard body 1, and the second through groove 451 is located directly below the blackboard body 1.
As shown in fig. 1, 3 and 4, the first through groove 351 is located on the first dust-proof pipe 35 on the side away from the blackboard body 1, and the second through groove 451 is located on the second dust-proof pipe 45 on the side away from the blackboard body 1.
The cross section of the first dust-proof pipe 35 is circular, and the central angle corresponding to the groove width of the first through groove 351 is
The cross section of the second dust-proof pipe 45 is circular, and the central angle corresponding to the groove width of the second through groove 451 is
As shown in fig. 3-5, the blackboard eraser assembly 2 comprises a first beam 22, a second beam 23 and a blackboard eraser 21; two ends of the first cross beam 22 respectively penetrate through the first through groove 351 and the second through groove 451 and are respectively connected to the first slide block 32 and the second slide block 42; the second beam 23 is fixedly connected to one side surface, opposite to the blackboard body 1, of the first beam 22, and a groove is formed in one side surface, opposite to the blackboard body 1, of the second beam 23 along the length direction of the second beam; the blackboard eraser 21 is vertically pressed on the writing surface of the blackboard body 1, a protrusion 217 is arranged on the back surface of the blackboard eraser 21 along the length direction of the blackboard eraser, and the protrusion 217 is arranged in the groove in a matched mode and connected with the bottom of the groove through a plurality of springs 24; the spring 24 presses the blackboard eraser 21 against the writing surface of the blackboard body 1.
As shown in fig. 3-6, the blackboard eraser 21 is vertically pressed on the writing surface of the blackboard body 1 and is fully distributed over the vertical length of the blackboard body 1; the blackboard eraser 21 comprises a shell, a partition plate is arranged in the shell, and the partition plate divides the interior of the shell into a dust suction cavity 213 and a dust accumulation cavity 214; a plurality of dust suction fans 215 are fixedly arranged on the partition board, and the dust suction fans 215 are used for introducing air in the dust suction cavity 213 into the dust collection cavity 214; a plurality of groups of bristles 211 are uniformly arranged on the end face of one side, close to the dust suction cavity 213, of the shell, a plurality of dust suction holes 212 are formed among the plurality of groups of bristles 211 on the side face, and the dust suction holes 212 are communicated with the dust suction cavity 213.
An air outlet is formed in the top of the dust collecting cavity 214, and a dust filter screen 218 is arranged at the air outlet; the bottom of the dust collecting cavity 214 is provided with an ash discharging port, and a sealing plug 216 is arranged inside the ash discharging port.
As shown in fig. 1 and 2, a first installation box 33 and a first supporting platform 34 are respectively arranged at two ends of the blackboard body 1 directly above, and two ends of the first dustproof pipe 35 are respectively fixedly connected to the first installation box 33 and the first supporting platform 34; a first screw rod 31 is arranged in the first dustproof pipe 35, and two ends of the first screw rod 31 are respectively and rotatably arranged on the first installation box 33 and the first supporting platform 34 through bearings; the first motor is arranged inside the first mounting box 33 and connected with the first screw rod 31 to drive the first screw rod 31 to rotate.
As shown in fig. 1 and 2, a second installation box 43 and a second support platform 44 are respectively arranged at two ends of the blackboard body 1 right below the blackboard body 1, and two ends of the second dustproof pipe 45 are respectively and fixedly connected to the second installation box 43 and the second support platform 44; a second screw rod 41 is arranged in the second dustproof pipe 45, and two ends of the second screw rod 41 are respectively and rotatably arranged on a second installation box 43 and a second support platform 44 through bearings; and a second motor is arranged in the second mounting box 43 and connected with the second screw rod 41 to drive the second screw rod 41 to rotate.
Example 2
A self-cleanable blackboard, embodiment 2 is different from embodiment 1 in that, as shown in FIGS. 7 to 9, the first through groove 351 is located on the side of the first dust-proof pipe 35 away from the wall, and the second through groove 451 is located on the side of the second dust-proof pipe 45 away from the wall.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a but self-cleaning blackboard, includes blackboard body (1), install on the wall blackboard body (1), its characterized in that: a blackboard eraser assembly (2) is vertically pressed on the writing surface of the blackboard body (1); a first dustproof pipe (35) and a second dustproof pipe (45) are respectively arranged right above and right below the blackboard body (1), and a first through groove (351) and a second through groove (451) are respectively arranged on the side walls of the first dustproof pipe (35) and the second dustproof pipe (45) along the axial direction; a first screw rod (31) and a second screw rod (41) are respectively and rotatably arranged in the first dustproof pipe (35) and the second dustproof pipe (45), and a first sliding block (32) and a second sliding block (42) are respectively arranged on the first screw rod (31) and the second screw rod (41) in a threaded fit manner; the two ends of the blackboard eraser assembly (2) penetrate through the first through groove (351) and the second through groove (451) respectively and are connected to the first sliding block (32) and the second sliding block (42) respectively.
2. The self-cleanable blackboard according to claim 1, wherein: the first through groove (351) is located right above the blackboard body (1), and the second through groove (451) is located right below the blackboard body (1).
3. The self-cleanable blackboard according to claim 2, wherein: the first through groove (351) is located on one side, away from the blackboard body (1), of the first dustproof pipe (35), and the second through groove (451) is located on one side, away from the blackboard body (1), of the second dustproof pipe (45).
4. The self-cleanable blackboard according to claim 2, wherein: the first through groove (351) is located on one side, far away from the wall body, of the first dustproof pipe (35), and the second through groove (451) is located on one side, far away from the wall body, of the second dustproof pipe (45).
5. The self-cleanable blackboard according to claim 3 or 4, wherein: the first dustproof pipe (35)
The cross section of the first through groove (351) is circular, and the central angle corresponding to the groove width of the first through groove is not larger than; the cross section of the second dustproof pipe (45) is circular, and the central angle corresponding to the groove width of the second through groove (451) is not more than
6. The self-cleanable blackboard according to claim 5, wherein: the blackboard eraser assembly (2) comprises a first cross beam (22), a second cross beam (23) and a blackboard eraser (21); two ends of the first cross beam (22) penetrate through the first through groove (351) and the second through groove (451) respectively and are connected to the first sliding block (32) and the second sliding block (42) respectively; the second cross beam (23) is fixedly connected to one side face, opposite to the blackboard body (1), of the first cross beam (22), and a groove is formed in one side face, opposite to the blackboard body (1), of the second cross beam (23) along the length direction of the side face; the blackboard eraser (21) is vertically pressed on the writing surface of the blackboard body (1), a protrusion (217) is arranged on the back surface of the blackboard eraser (21) along the length direction of the blackboard eraser, the protrusion (217) is arranged inside the groove in a matched mode and is connected with the bottom of the groove through a plurality of springs (24); the spring (24) enables the blackboard eraser (21) to be pressed on the writing surface of the blackboard body (1).
7. The self-cleanable blackboard according to claim 6, wherein: the blackboard eraser (21) is fully distributed on the vertical length of the blackboard body (1); the blackboard eraser (21) comprises a shell, a partition plate is arranged in the shell, and the partition plate divides the interior of the shell into a dust suction cavity (213) and a dust accumulation cavity (214); the partition board is fixedly provided with a plurality of dust suction fans (215), and the dust suction fans (215) are used for introducing air in the dust suction cavity (213) into the dust collection cavity (214); a plurality of groups of bristles (211) are uniformly arranged on the end face, close to one side of the dust suction cavity (213), of the shell, a plurality of dust suction holes (212) are formed among the plurality of groups of bristles (211) on the side face, and the dust suction holes (212) are communicated with the dust suction cavity (213).
8. The self-cleanable blackboard according to claim 7, wherein: an air outlet is formed in the top of the dust collecting cavity (214), and a dust filter screen (218) is arranged at the air outlet; the bottom of the dust accumulation cavity (214) is provided with an ash discharge port, and a sealing plug (216) is arranged in the ash discharge port.
9. The self-cleanable blackboard according to claim 1, wherein: a first installation box (33) and a first supporting platform (34) are respectively arranged at two ends right above the blackboard body (1), and two ends of the first dustproof pipe (35) are respectively and fixedly connected to the first installation box (33) and the first supporting platform (34); a first screw rod (31) is arranged in the first dustproof pipe (35), and two ends of the first screw rod (31) are respectively and rotatably arranged on the first installation box (33) and the first supporting platform (34) through bearings; a first motor is arranged inside the first installation box (33), and the first motor is connected with the first screw rod (31) and drives the first screw rod (31) to rotate.
10. The self-cleanable blackboard according to claim 1, wherein: a second installation box (43) and a second supporting platform (44) are respectively arranged at two ends of the blackboard body (1) right below the blackboard body, and two ends of a second dustproof pipe (45) are respectively and fixedly connected to the second installation box (43) and the second supporting platform (44); a second screw rod (41) is arranged in the second dustproof pipe (45), and two ends of the second screw rod (41) are respectively and rotatably arranged on a second installation box (43) and a second supporting platform (44) through bearings; and a second motor is arranged in the second mounting box (43), and the second motor is connected with the second screw rod (41) and drives the second screw rod (41) to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921099830.9U CN210821526U (en) | 2019-07-12 | 2019-07-12 | Blackboard capable of being cleaned automatically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921099830.9U CN210821526U (en) | 2019-07-12 | 2019-07-12 | Blackboard capable of being cleaned automatically |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210821526U true CN210821526U (en) | 2020-06-23 |
Family
ID=71276108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921099830.9U Expired - Fee Related CN210821526U (en) | 2019-07-12 | 2019-07-12 | Blackboard capable of being cleaned automatically |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210821526U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112277508A (en) * | 2020-11-19 | 2021-01-29 | 杭州练链科技有限公司 | Intelligent blackboard eraser for campus classroom |
-
2019
- 2019-07-12 CN CN201921099830.9U patent/CN210821526U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112277508A (en) * | 2020-11-19 | 2021-01-29 | 杭州练链科技有限公司 | Intelligent blackboard eraser for campus classroom |
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| 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: 20200623 Termination date: 20210712 |