CN211843876U

CN211843876U - Blackboard eraser capable of automatically absorbing dust by utilizing air pressure difference

Info

Publication number: CN211843876U
Application number: CN202020251628.XU
Authority: CN
Inventors: 刘思佳
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-04
Filing date: 2020-03-04
Publication date: 2020-11-03
Anticipated expiration: 2030-03-04

Abstract

The utility model discloses a blackboard eraser capable of automatically absorbing dust by utilizing air pressure difference, which is cuboid and comprises an upper wall, a lower wall, a side wiping wall and other three side walls, wherein the upper wall and the lower wall are parallel to each other; the upper wall and the other three side walls are made of rubber, the lower wall is made of plastic, and the wiping wall is made of plastic or wood; the upper wall is provided with an exhaust hole, the lower wall is provided with a dust collecting bag communicated with the cavity, the wiping wall is provided with bristles and dust collecting holes, and the dust collecting bag is made of rubber. The simple blackboard eraser has the advantages that flying dust is sucked in time by utilizing the principle of air pressure difference, the problem that the body health of teachers and students is affected due to the fact that the simple blackboard eraser cannot well reduce the flying dust is effectively solved, and meanwhile, compared with the blackboard eraser with a complex structure, the simple blackboard eraser is simple in structure, convenient to operate and use and low in cost.

Description

Blackboard eraser capable of automatically absorbing dust by utilizing air pressure difference

Technical Field

The utility model belongs to the teaching aid field relates to an utilize automatic blackboard eraser of dust absorption of atmospheric pressure difference.

Background

In a classroom, teachers and students often use a blackboard eraser to remove chalk handwriting on the blackboard, and flying dust can affect the health of the teachers and students. At present, the blackboard erasers can be roughly divided into two categories: the blackboard eraser is simple in structure, convenient to operate and use, and incapable of well reducing flying of dust, and is simple and easy, and various in pure-fur erasing type, externally-wrapped cloth type, water-absorbing sponge type and the like; secondly, the blackboard eraser which has a complex structure and is relatively complex to operate but can well reduce the flying of dust has various pure mechanical, electric, intelligent and the like.

The existing blackboard eraser mainly has the following defects: firstly, the simple blackboard eraser cannot well reduce the flying of dust, and secondly, the dust is attached to the surface of the blackboard to cause the incomplete removal of chalk handwriting. The blackboard eraser with a complex structure is often complex in structure, complex in operation, prone to failure, inconvenient to maintain and high in cost, although the flying of dust is often better reduced.

SUMMERY OF THE UTILITY MODEL

Objects of the invention

The utility model aims at: the blackboard eraser capable of automatically absorbing dust by utilizing the air pressure difference is simple in structure and convenient to operate, and dust is not prone to flying.

(II) technical scheme

In order to solve the technical problem, the utility model provides an automatic dust-absorbing blackboard eraser utilizing air pressure difference, which is cuboid and comprises an upper wall and a lower wall 3 which are parallel, a side wiping wall 1 formed between the upper wall and the lower wall 3 and other three-side walls 2, wherein a cavity is formed inside a cuboid structure; the upper wall and the other three side walls 2 are made of rubber, the lower wall 3 is made of plastic, and the wiping wall 1 is made of plastic or wood; the upper wall is provided with an exhaust hole, the lower wall 3 is provided with a dust collecting bag 4 communicated with the cavity, the wiping wall 1 is provided with bristles 6 and dust suction holes 7, and the dust collecting bag 4 is made of rubber.

Wherein the lower wall 3 is provided with an opening, and the dust collecting bag 4 is detachably arranged on the opening.

Wherein, an opening on the lower wall 3 is provided with a one-way valve 5 which can be opened towards the interior of the dust collecting bag 4.

Wherein the diameter of the vent hole on the upper wall is set to be between 0.5cm and 1 cm.

Wherein the bristles 6 on the wiping wall 1 are evenly arranged.

Wherein, the dust absorption holes 7 are distributed among the brush hairs 6, and the dust absorption holes 7 are communicated with the cavity.

(III) advantageous effects

The blackboard eraser capable of automatically absorbing dust by utilizing the air pressure difference provided by the technical scheme can timely absorb flying dust by utilizing the air pressure difference principle, effectively solves the problem that the body health of teachers and students can be influenced because the flying dust of the simple blackboard eraser can not be well reduced, and has the advantages of simple structure, convenience in operation and use and low cost compared with the blackboard eraser with a complex structure; the dust on the surface of the blackboard is sucked in time by utilizing the air pressure difference principle, so that the dust can be effectively reduced to be attached to the surface of the blackboard, and the thoroughness of removing chalk handwriting is improved.

Drawings

Fig. 1 is a structural diagram of a blackboard eraser capable of automatically absorbing dust by using air pressure difference according to an embodiment of the present invention.

In the figure: 1-wiping the wall; 2-other three side walls; 3-the lower wall; 4-dust collection bag; 5-one-way valve; 6-brush hair; 7-dust suction hole; 8-air vent.

Detailed Description

In order to make the objects, contents and advantages of the present invention clearer, the following description will make a detailed description of embodiments of the present invention with reference to the accompanying drawings and examples.

Referring to fig. 1, the blackboard eraser of the present embodiment is a cuboid, and includes parallel upper and lower walls 3, a side wiping wall 1 formed between the upper and lower walls 3, and other three side walls 2, and a cavity is formed inside the cuboid structure; the upper wall and the other three side walls 2 are made of rubber, the lower wall 3 is made of plastic, and the wiping wall 1 is made of plastic or wood; the upper wall is provided with an exhaust hole, the lower wall 3 is provided with a dust collecting bag 4 communicated with the cavity, the wiping wall 1 is provided with bristles 6 and dust suction holes 7, and the dust collecting bag 4 is made of rubber.

Wherein, the lower wall 3 is provided with an opening, and the dust collecting bag 4 is detachably arranged on the opening so as to facilitate the cleaning of the collected dust; further, a check valve 5 openable toward the inside of the dust collecting bag 4 is provided at the opening, that is: the check valve 5 is openable toward the inside of the dust collecting bag 4 and is not openable toward the inside of the cavity.

In order to facilitate the operation and use of the blackboard eraser by adults and children, the diameter of the exhaust hole on the upper wall can be set to be 0.5 cm-1 cm.

The bristles 6 on the wiping wall 1 are uniformly distributed, the dust suction holes 7 are distributed among the bristles 6, and the dust suction holes 7 are communicated with the cavity.

The use method of the blackboard eraser with the structure comprises the following steps:

1. before the blackboard is erased, the exhaust holes in the upper wall are not blocked, the other three side walls of the blackboard eraser made of rubber are lightly pinched to discharge air in the cavity through the exhaust holes, and then the exhaust holes are blocked by forefingers.

2. When the blackboard is erased, the other three side walls of the blackboard eraser made of rubber are slightly and gradually loosened, the exhaust hole is continuously plugged by the forefinger, at the moment, the air pressure in the cavity is lower than the external atmospheric pressure, under the action of pressure difference, dust erased by the bristles is sucked into the cavity through the dust suction hole, at the moment, the one-way valve is closed, and the dust cannot enter the dust collection bag.

3. When the other three side walls of the rubber blackboard eraser are completely expanded, dust is collected in the cavity. And the forefinger continues to plug the exhaust hole, and simultaneously lightly pinches other three side walls of the blackboard eraser made of rubber, the one-way valve is opened, and dust enters the dust collection bag.

4. After the blackboard is erased or the dust collecting bag is full of dust, the dust collecting bag is taken down to pour out the dust and is cleaned, and then the dust collecting bag is put back to be reused.

According to the above technical scheme, the utility model discloses an in the blackboard eraser, utilize the atmospheric pressure difference principle to realize automatic dust absorption, the brush hair is used for clearing up the powder handwriting, the dust absorption hole is used for inhaling the dust, the exhaust hole of upper wall is used for air escape in the cavity, the dust is collected to the dust collection bag of lower wall, one-way valve is used for guaranteeing that the dust is one-way to get into the dust from the cavity and collects the bag and prevent it from the dust collection bag to get into in the cavity, overall structure is simple, convenient operation, the dust is collected in real time, can reduce the dust and fly upward.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.

Claims

1. The blackboard eraser capable of automatically absorbing dust by utilizing air pressure difference is characterized in that the blackboard eraser is cuboid and comprises an upper wall and a lower wall (3) which are parallel, a side wiping wall (1) formed between the upper wall and the lower wall (3) and other three side walls (2), and a cavity is formed in the cuboid structure; the upper wall and the other three side walls (2) are made of rubber, the lower wall (3) is made of plastic, and the wiping wall (1) is made of plastic or wood; the upper wall is provided with an exhaust hole, the lower wall (3) is provided with a dust collecting bag (4) communicated with the cavity, the wiping wall (1) is provided with bristles (6) and dust suction holes (7), and the dust collecting bag (4) is made of rubber.

2. The blackboard eraser capable of automatically absorbing dust by using air pressure difference as claimed in claim 1, wherein the lower wall (3) is provided with an opening, and the dust collecting bag (4) is detachably mounted on the opening.

3. The blackboard eraser capable of automatically absorbing dust by using air pressure difference as claimed in claim 2, characterized in that the opening on the lower wall (3) is provided with a check valve (5) capable of opening towards the inside of the dust collecting bag (4).

4. The blackboard eraser capable of automatically absorbing dust by using air pressure difference as claimed in claim 1, wherein the diameter of the exhaust hole on the upper wall is set to be between 0.5cm and 1 cm.

5. The blackboard eraser capable of automatically absorbing dust by using air pressure difference as claimed in claim 1, wherein the brush hairs (6) on the wiping wall (1) are uniformly arranged.

6. The blackboard eraser capable of automatically absorbing dust by using air pressure difference as claimed in claim 1, wherein the dust absorbing holes (7) are distributed among the brush hairs (6), and the dust absorbing holes (7) communicate with the cavity.