A dust-absorbing blackboard eraser belongs to a teaching tool. On the inner side of the injection molding shell, two ribs and four limit baffles are cast on two sides parallel to the shell, and the upper end face of the shell is provided with a through hole; The upper end of the screw of the injection molding scraper fixing frame is threaded; The scraper body is embedded in the groove of the lower end face of the fixing frame; The fixing frame is located in the middle of the limit baffle; The screw rod passes through the through hole of the shell and is in threaded connection with the upper gland embedded with the spring; The brush is installed in the groove of the rib; And the dust collector is installed on the corresponding side of the case without ribs. The utility model has the advantages of preventing dust from flying, keeping the environment clean and collecting dust while wiping.
A negative pressure blackboard eraser vacuum cleaner suitable for the blackboard eraser chalk frame in China's education system is designed. The blackboard eraser vacuum cleaner consists of a shell, a dust removal device, a filter bag assembly, a gas distribution device, a connecting air duct, an induced draft fan, a fan motor, an exhaust pipe and a power switch. The dust cleaning device, the filter bag assembly and the gas distribution device are supported on the inner convex platform of the shell, and the induced draft fan and the fan motor are supported on the bottom of the shell. The connecting air duct connects the air outlet of the induced draft fan with the air inlet of the air distribution device, and the exhaust pipe and the power switch are installed on the side wall of the shell. The blackboard eraser cleaner designed in this paper has the characteristics of double dust removal mechanism of gravity settlement and air filtration, high dust removal efficiency, simple structure, convenient dust removal, low cost and high reliability.
The formula of dust-free chalk: raw materials calcium salt, barium salt and water are mixed in proportion, stirred, molded and dried to obtain the finished product.
Calcium sulfate, barium sulfate and H2O = 36.2%, 37.6% and 26.2%, and an appropriate amount of binder is added.
Material: empty bottle for spraying; Asbestos materials for ordinary erasers
Practice: Fill the bottle with clear water, and then stick asbestos material on the bottle.
Usage: first spray some water mist on the blackboard with a nozzle, not too much! Then just wipe it with asbestos.
Principle: Because the spray is water mist, it will not make the dust paste, and at the same time avoid the dust from raising.
Disclaimer: patent protection, if mass production, you have to pay taxes for me! thank you
If the eraser is the type that can be wrapped with a layer of cloth, it is suggested that you wrap a polyester cloth outside the eraser (pay attention to the moderate size when cutting). Try it, because this material should generate static electricity more easily.
The vacuum cleaner mainly consists of three parts: dust collection, dust collection and dust filtration, generally including series commutator motor, centrifugal fan, dust filter (bag) and dust collection accessories. Generally, the power of vacuum cleaner is above 400- 1000W, and that of portable vacuum cleaner is generally below 250W w.
Vacuum cleaner can remove dust mainly because its "head" is equipped with an electric exhaust fan. There is a wind wheel on the rotating shaft of the exhaust fan. After electrifying, the exhaust fan will generate extremely strong suction and pressure at a speed of 500 revolutions per second. Under the action of suction and pressure, the air will be discharged at high speed, and the air in the dust suction part at the front end of the fan will continuously replenish the air in the fan, resulting in an instantaneous vacuum inside the vacuum cleaner and a negative pressure difference with the external atmospheric pressure. Under the action of this pressure difference, dusty air will be sucked in. Dust and other sundries enter the dust collection bag through carpet or floor brush, long nozzle, elbow, hose and hose connector in turn. Dust and other sundries are left in the dust bag, and the air is purified by the filter and discharged from the tail of the machine body. Because the gas is heated when it passes through the motor, the gas discharged from the tail of the cleaner is hot.
There is a dust collecting box in the suction bucket of the vacuum cleaner, and the dust is left in the dust collecting box. When the box is full, you can take it out and wash it with water. The vacuum cleaner can complete different cleaning tasks with different components, such as floor brush to clean the floor, flat brush to clean the sofa surface, sheets, curtains and so on. There is also a small suction nozzle, which can remove dust from small corners and dirt from some household appliances.