Blackboard eraser capable of collecting chalk dust

Abstract

The invention discloses a blackboard eraser capable of collecting chalk dust. The blackboard eraser comprises a square barrel body (1), paddles (2), a support (3), a motor (4), a barrel cover (6) andbristles (8). The top of the square barrel body (1) is provided with an opening, the barrel cover (6) covers the opening at the top of the square barrel body (1), through holes (7) fully covering thewall surface are formed in the front wall and the rear wall of the square barrel body (1), the bristles (8) are fixedly arranged between the through holes (7) in the front wall of the square barrel body (1), the bottom of the square barrel body (1) is provided with the support (3), the motor (4) is mounted on the upper portion of the support (3), a driving shaft of the motor (4) is connected withthe pair of paddles (2), and a filtering device is arranged in the square barrel body (1) and is close to the front of the rear wall of the square barrel body (1). The rotating paddles are utilized tosuck the dust into the square barrel body, and the blackboard eraser is high in dedusting efficiency and simple in structure and completely meets blackboard dust removing requirements.

Description

technical field [0001] The invention relates to a teaching tool, in particular to a chalk eraser capable of collecting chalk dust. Background technique [0002] Chinese Patent Application No. 201520881016.8 has announced a patent application titled: a kind of patent application for teaching dust-absorbing chalk wipes. The patent No. [0032] records: "The fourth side wall 123 is provided with a dust inlet hole 124, through which the dust The entry hole 124 allows the dust to be wiped to enter;", while [0033] records: "The grip part 11 includes a housing 111 and a powder storage box 112, and the housing 111 is arranged on the support part 12; the powder storage box 112 Set in the casing 111, the operator holds the casing 111 during the wiping process, and bears the force exerted by the operator. During the collection process, the dust is collected into the powder storage box 112, and the powder is stored after collection After the box 112 is full, you can open the housing 111,...

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Problems solved by technology

[0003] The above-mentioned patent has the following defects in the actual use process. First, the dust inlet hole 124 is set on the fourth side wall 123. Please note that it is set on the side wall instead of the bottom of the entire chalk eraser. We all know that the dust starts It is produced from the contact surface between the bottom of the chalk eraser and the blackboard, so if the dust inlet hole 124 is arranged on the side instead of the bottom, its dust suction effect is very small; secondly, the dust suction process of the device is through the dust suction head 32 The air pumping action pumps the dust into the powder storage box 112. As understood by those skilled in the art, the above-mentioned dust suction device 3 generates negative pressure through suction, and the dust is sucked into the powder storage box 112 through the pressure difference. Know the principle of the vacuum cleaner, the main reason that the vacuum cleaner can remove dust is that its "head" is equipped with an electric exhaust fan, and there is a wind impeller on the rotating shaft of the exhaust fan. Suction and pressure, under the action of suction and pressure, the air is discharged at high speed, and the air in the dust suction part of the front end of the fan continuously replenishes the air in the fan, resulting in an instantaneous vacuum inside the vacuum cleaner and a negative pressure difference with the outside atmospheric pressure. Under the influence of bad air, dust and other sundries enter the filter device, the air is purified by the filter, and then discharged from the tail of the body

However, the dust generated in the above-mentioned patent directly enters the powder storage box 112. Through the above analysis, the dust should enter the powder storage box 112 through the filter device, but the above-mentioned patent does not indicate that there is still a filter device, and the filter device. The specific structure and position are not described in any way; at the same time, in order to continue the dust removal work, the device should circulate the air entering the dust collection device, but this patent does not specify it, so from the perspective of those skilled in the art, the above-mentioned It is difficult to achieve the dust removal effect of the patent. Even if it is further optimized, its structure is complicated, and the manufacturing cost must be high. A small blackboard eraser is so expensive to manufacture, and its practicality is greatly reduced.

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