CN111497506A

CN111497506A - Cleaning blackboard eraser

Info

Publication number: CN111497506A
Application number: CN202010487052.1A
Authority: CN
Inventors: 邓穆荣; 谢宝玲; 高娜; 穆桐; 罗羽
Original assignee: Shenyang University of Technology
Current assignee: Shenyang University of Technology
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2020-08-07

Abstract

The invention relates to a cleaning blackboard eraser, wherein a water tank and an air tank are arranged inside a shell of the blackboard eraser, an air pressure return spring is arranged in the air tank, the air tank is communicated with the outside atmosphere, and a first one-way valve is arranged at the communication position of the air tank and the outside atmosphere; the air tank is communicated with the water tank, and a second one-way valve is arranged at the communication position of the air tank and the water tank; the water tank is communicated with the injection tank, and a third one-way valve is arranged at the communication position of the water tank and the injection tank; a water filling port is arranged at the side of the water tank; the bottom of the injection box is provided with an injection plate, the two sides of the bottom of the shell are both provided with dry cloth clamps, the dry cloth clamps at the two sides are connected through a push-pull rod, and the push-pull rod is provided with a friction plug. The blackboard eraser does not need to consume energy sources such as electric energy and the like in the using process, and changes the direction of force through a smart mechanical structure, so that the dustless erasing and drying of the blackboard are reasonably realized.

Description

Cleaning blackboard eraser

Technical Field

The invention relates to the technical field of teaching supplies, in particular to a cleaning blackboard eraser.

Background

The blackboard eraser is an important tool in teacher teaching, and has an important function as an important medium for education and teaching. Most of the existing blackboard erasers used for teaching are also traditional blackboard erasers, the dust removal effect is poor, and many teachers have oral diseases and respiratory diseases due to excessive chalk dust suction amount, so that the physical conditions are poor and the physical health of the teachers is affected; the blackboard eraser has poor dust removal effect, influences the watching effect of students and causes unsatisfactory teaching effect. Although various blackboard erasers have appeared in society, many problems still remain that the blackboard erasers cannot be completely cleaned and cannot be dried and cleaned.

The problem that a plurality of people pollute the blackboard eraser greatly and the effect is poor is solved and the design of a real object is provided. There are many design documents on the blackboard eraser on the known network, for example, huizing and dongyuanning (2020) designs adopt PC end control, and the laser positioning method designs a large blackboard eraser for fixed-point blackboard erasing, the assembly of the product needs to be fixed on the whole blackboard, the size is large, the manufacturing and using cost is high, and the wireless control is easily interfered by external wireless signals, so that the using effect is reduced. Such as Yan Yiwei et al (2020) utilize a water-soluble dust-emitting blackboard eraser. Like the design of Wanglanshi (2019), the dust removal concept is also researched, a fan is arranged in the blackboard eraser, chalk dust is collected into a box by utilizing suction force formed by rotation of the fan, the collection capacity of the product has certain limitation, floating chalk dust is scattered widely, and chalk in the space outside the blackboard eraser shell cannot be completely collected if the chalk dust is collected by only one small fan in the blackboard eraser. The work consumes electric energy resources when the work fan is used, and a large amount of noise is generated when the work fan is used in class. From another point of view, certain impracticality is brought. Also, as the chinese patent No. 201821200035.X, a water-spraying blackboard eraser is disclosed, which uses sprayed water to reduce dust in the air, but the blackboard of the patent is wet and cannot be dried timely when in use, so that characters on the blackboard are particularly unclear, so that the dust removal effect is good in actual use, but the drying degree of the blackboard is neglected, so that the handwriting is unclear, and the teaching effect is affected.

Disclosure of Invention

The purpose of the invention is as follows:

the invention provides a cleaning blackboard eraser, and aims to solve the problems that the blackboard eraser is poor in cleaning effect at the present stage, large in pollution in the using process and the like.

The technical scheme is as follows:

a cleaning blackboard eraser is characterized in that a water tank and an air tank are arranged inside a shell of the blackboard eraser, an air pressure return spring is arranged in the air tank, one end of the air pressure return spring is in top contact with the inner wall of one side of the air tank, and the other end of the air pressure return spring is in top contact with an air inlet switch; the air box is communicated with the outside atmosphere, and a first one-way valve is arranged at the communication position of the air box and the outside atmosphere; the air tank is communicated with the water tank, and a second one-way valve is arranged at the communication position of the air tank and the water tank; the water tank is communicated with the injection tank, and a third one-way valve is arranged at the communication position of the water tank and the injection tank; a water filling port is arranged at the side of the water tank; the bottom of the injection box is provided with an injection plate, the injection plate is provided with a plurality of injection holes, both sides of the bottom of the shell are provided with dry cloth clamps, the dry cloth clamps at both sides are connected through a push-pull rod, and the push-pull rod is provided with a friction plug.

The end part of the push-pull rod is fixedly connected with one end of the flexible steering sheet, and the other end of the flexible steering sheet passes through the steering sheet sliding block to be fixedly connected with the dry cloth clamp.

The bottom of the water tank is provided with a third one-way valve, and the water tank is communicated with or separated from the injection tank through the third one-way valve.

The first one-way valve, the second one-way valve and the third one-way valve are consistent in structure, cover plates with springs are arranged on groove bodies which are all concave, and the cover plates are matched with holes to be sealed.

One side of the friction plug, which is contacted with the blackboard, is arranged to be in a prism structure.

The upper end of the shell is provided with a handle, and the section of the handle is in an omega shape.

The dry cloth clamp consists of side plates at two sides and a transverse plate, two long edges of the transverse plate are respectively connected with the middle shafts of the two side plates, and the side plates at two sides of the transverse plate are connected through a dry cloth clamp spring.

Has the advantages that:

the invention provides a clean blackboard eraser, which does not need the consumption of energy sources such as electric energy and the like in the using process, only needs a simple mechanical erasing process, converts the mechanical movement in the erasing process into energy for providing power, and changes the direction of force by a friction force through a smart mechanical structure, thereby reasonably realizing the dust-free erasing and drying of the blackboard; the wiping structure fundamentally prevents the generation of chalk dust and achieves the effect of dust removal; the blackboard is dry and clean due to reasonable rising and falling of the drying structure, the effect that the blackboard can be used after being erased is finally realized, the condition that chalk dust flies up due to the traditional blackboard eraser is avoided, the conditions that the blackboard eraser of a water spraying type fails to dry the blackboard in time, characters on the blackboard are not clear, the teaching effect is influenced and the like are avoided.

The blackboard eraser is reasonable in structure, the water tank is in a handheld shape, and the blackboard eraser is more comfortable to use; the product is small and exquisite, the material uses plastics, the cost is low, have very good economy; the environment-friendly and pollution-free tea bag is green and has important significance for protecting the environment and the physical health of teachers; high efficiency and simple operation.

Drawings

FIG. 1 is an overall schematic view of a cleaning blackboard eraser;

FIG. 2 is an overall view of the interior of the cleaning blackboard eraser;

FIG. 3 is a schematic view of the internal structure of the end of the cleaning blackboard eraser;

FIG. 4 is a transverse cross-sectional view of a cleaning blackboard eraser;

FIG. 5 is an exploded view of the internal structure of the cleaning blackboard eraser;

FIG. 6 is a schematic view of a check valve;

FIG. 7 is a schematic view of a dry cloth clip;

FIG. 8 is an enlarged view of the structure of FIG. 7 at A;

FIG. 9 is an enlarged view of the structure at B in FIG. 7;

the figure is marked with: 1. the air inlet valve comprises an air inlet switch, 2 parts of a handle, 3 parts of a shell, 4 parts of a friction plug, 5 parts of an injection box, 5-1 parts of an injection plate, 6 parts of a dry cloth clamp, 6-1 parts of a side plate, 6-2 parts of a transverse plate, 6-3 parts of a shaft, 6-4 parts of an end part, 6-5 parts of a limiting rod, 6-6 parts of a dry cloth clamp spring, 7 parts of a limiting connecting piece, 8 parts of a water tank water inlet plug, 9 parts of an air box cover, 10 parts of an air inlet hole, 11 parts of an air box, 12 parts of a return spring, 13 parts of a water box, 14 parts of a flexible steering sheet, 15 parts of a steering sheet sliding block, 16 parts of a push-pull rod, 17 parts of a first one-way valve, 18 parts of a water inlet, 19 parts of an air outlet hole, 20 parts of a.

Detailed Description

The application is a cleaning blackboard eraser capable of efficiently completing a cleaning task. The blackboard eraser utilizes the principles that friction force provides power for a dry cloth clamp, elastic deformation changes the direction of the force, gas pressure difference provides power for water spraying and the like, so that the blackboard eraser generates automatic control by utilizing physical properties such as pressure difference, elastic deformation and the like, resources are reasonably utilized, and unnecessary waste of energy supply by utilizing electric energy is saved. Fundamentally prevents the formation of chalk dust, can clean the blackboard fast, and to the environmental protection and the healthy significance of teacher.

A water tank 13 and an air tank 11 are arranged inside a shell 3 of the blackboard eraser, the water tank 13 is communicated with or separated from the air tank 11, a water filling port 18 is arranged on the side of the water tank 13, an injection tank 5 is arranged below the water tank 13, the water tank 13 is communicated with or separated from the injection tank 5, an injection plate 5-1 is arranged at the bottom of the injection tank 5, a plurality of injection holes are formed in the injection plate 5-1, dry cloth clamps 6 are arranged on two sides of the bottom of the shell 3 respectively, the dry cloth clamps 6 are used for clamping quick dry cloth, the dry cloth clamps 6 on the two sides are connected through a push-pull rod 16, and a friction plug 4 is arranged on the push-pull rod.

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1-5, a cleaning blackboard eraser, a water tank 13 and an air tank 11 are arranged in a housing 3, a handle 2 is formed at the upper end of the water tank 13 and the periphery of the air tank 11, the water tank 13 is communicated with or separated from the air tank 11, a water filling port 18 is arranged at the side of the water tank 13, a water filling plug 8 of the water tank is plugged in the water filling port 18, water is filled into the water tank 13 from the water filling port 18, the water filling plug 8 of the water tank prevents water in the water tank 13 from flowing out, the water tank 13 is communicated with or separated from an injection tank 5, the bottom of the injection tank 5 is an injection plate 5-1, the bottom is the side contacted with a blackboard, a plurality of injection holes are arranged on the injection plate 5-1, four third one-way valves 21 are arranged at the bottom of the water tank 13, the side contacted with the blackboard, the water tank 13 is communicated with or separated from the injection, the magic tape is convenient for replacing the sponge, water in the water tank 13 can enter the injection tank 5 through the four third one-way valves 21, and then flows out from the injection holes of the injection plate 5-1 to soak the sponge; the left and right sides of the bottom of the shell 3 are respectively provided with a dry cloth clamp 6, the dry cloth clamp 6 is used for clamping quick dry cloth, the bottom of the dry cloth clamp is in contact with the blackboard, the ends of the dry cloth clamps 6 on the two sides are connected through a push-pull rod 16, a friction plug 4 is arranged on the push-pull rod 16, the friction plug 4 is made of rubber, the friction plug 4 is in contact with the blackboard, and friction force generated by relative motion between the friction plug 4 and the blackboard provides power for the dry cloth clamps 6 on the left and right sides of the blackboard eraser to move upwards or downwards.

The injection plate 5-1 may be made of the same material as the injection tank 5, or may be a high-density water permeable plate, which may or may not have injection holes.

One end of the air box 11 is integrally provided with an air box cover 9, the air box cover 9 is provided with an air inlet 10, the air inlet 10 is integrally provided with a first one-way valve 17, and the air box 11 is communicated with the outside atmosphere or separated from the outside atmosphere through the first one-way valve 17; a pneumatic reset spring 12 is arranged in the air box 11, one end of the pneumatic reset spring 12 is pressed against the inner wall of one side of the air box 11, and the other end of the pneumatic reset spring 12 is pressed against the air inlet switch 1; an air outlet hole 19 is formed in the side wall of the air box 11, a second one-way valve 20 is arranged at the air outlet hole 19, and the air box 11 is communicated with or separated from the water tank 13 through the second one-way valve 20.

By pressing the air inlet switch 1, the air pressure return spring 12 is compressed or automatically returned by the elastic force, thereby controlling the pressure change in the air tank 11, and the pressure change of the air in the air tank 11 provides the power for ejecting the water in the water tank 13. Therefore, the blackboard eraser can be automatically controlled by utilizing the physical property of pressure difference, resources are reasonably utilized, and unnecessary waste of electricity energy supply is saved. When the air inlet switch 1 is pressed downwards, the internal volume of the air box 11 is reduced, the pressure in the air box 11 is increased, the first check valve 17 and the second check valve 20 are pressed against each other, the first check valve 17 seals the air inlet hole 10, the air box 11 is isolated from the outside atmosphere at the moment, the second check valve 20 is pressed to enable the air box 11 to be communicated with the water tank 13, the air pressure in the air box 11 provides power for water in the water tank 13 to be sprayed out from the four third check valves 21 at the bottom of the water tank 13, and then the water enters the injection box 5, spreads to the injection plate 5-1, is sprayed out through the injection holes on the injection plate 5-1, is uniformly sprayed to the sponge adhered to the injection plate 5-1 by the magic tapes, uniformly wets the sponge, and completely blends the chalk dust generated by the blackboard passing through into the wetted sponge when the sponge wipes the blackboard, thereby fundamentally removing the floating chalk dust and reducing the dust raising rate.

The air inlet switch 1 is released, the air pressure return spring 12 is quickly restored to the original position, the air pressure in the air tank 11 is reduced, and at the moment, the second one-way valve 20 communicated with the water tank 13 is reset by the pressure in the water tank 13, so that the air tank 11 is not communicated with the water tank 13; the first check valve 17 is pressed by the pressure of the external atmospheric pressure to open the air inlet hole 10 by the first check valve 17, so that the external atmosphere is communicated with the air box 11, and the purpose of restoring the balance of the internal pressure and the external pressure of the air box 11 by using the pressure difference is achieved.

As shown in fig. 6, the first check valve 17, the second check valve 20 and the third check valve 21 are identical in structure, a cover piece 23 with a spring is arranged on a groove body 22 which is concave, and the cover piece 23 is matched with a hole to be closed. The hole is plugged and opened by the spring.

As shown in fig. 2 and 5, both end portions of the push-pull rod 16 are fixedly connected with one end of the flexible steering strip 14 on the same side by bolts, the other end of the flexible steering strip 14 passes through the steering strip slider 15 on the same side and is fixedly connected with the dry cloth clamp 6 on the same side by bolts, and the steering strip slider 15 is fixedly connected in the housing 3 by bolts. Namely, the right end (the right side, i.e. the inner side shown in fig. 2) of the push-pull rod 16 is fixedly connected with one end of the right flexible steering sheet 14 through a bolt, and the other end of the right flexible steering sheet 14 passes through the right steering sheet sliding block 15 and is fixedly connected with the right cloth clamp 6 through a bolt; the left side is connected in the same way, and the left side and the right side of the push-pull rod 16 are in a symmetrical connection structure.

The steering sheet sliding block 15 is used for changing the bending degree of the flexible steering sheet 14, the direction of the flexible steering sheet 14 is changed through the steering sheet sliding block 15, and the elastic deformation of the flexible steering sheet 14 is utilized, so that the transverse friction force on the push-pull rod 16 is converted into the push-pull force in the vertical direction. Namely, the push-pull rod 16 converts the transverse friction force between the friction plug 4 and the blackboard into the vertical movement of the dry cloth clamp 6 under the restriction of the flexible steering sheet 14 and the steering sheet sliding block 15, and the dry cloth clamp connected with the left end of the push-pull rod 16 is contacted with the blackboard under the lever action of the push-pull rod 16, so that the dry cloth clamp connected with the right end of the push-pull rod 16 is separated from the blackboard, and vice versa.

The side of the friction plug 4 contacting the blackboard is arranged to be a prism structure. The prism-like structure can increase friction and provide a motive force for downward or upward movement of the push-pull rod 16. The periphery of the friction plug 4 is provided with a limiting connecting piece 7, a gap exists between the friction plug 4 and the limiting connecting piece 7, the limiting connecting piece 7 is fixed on the shell 3 through a bolt, and the limiting connecting piece 7 is used for limiting the moving distance of the friction plug 4 and has the function of an attractive blackboard eraser.

As shown in fig. 7-9, the dry cloth clamp 6 is composed of two side plates 6-1 and a transverse plate 6-2, two long sides of the transverse plate 6-2 are respectively connected with the middle shafts of the two side plates 6-1, the side plates 6-1 on two sides of the transverse plate 6-2 are connected through a dry cloth clamp spring 6-6, and the counter-elastic force of the dry cloth clamp spring 6-6 is used for providing the force for clamping the quick-drying cloth. The middle parts of the two side plates 6-1 are respectively provided with a cylindrical shaft 6-3, the end parts of the two long sides of the transverse plate 6-2 are arranged to be C-shaped end parts 6-4, and the end parts 6-4 are occluded on the shafts 6-3. As shown in figure 7, the inner side is a closed structure, the outer side is provided with a limiting rod 6-5, one end of the limiting rod 6-5 is fixed on the transverse plate 6-2 through a bolt, the other end of the limiting rod 6-5 is provided with an inward bulge, and the bulge is clamped into a small hole arranged at the end part of the shaft 6-3, namely, the bulge of the limiting rod 6-5 is in clearance fit with the shaft 6-3. The lower parts of the two side plates 6-1, namely the contact parts with the quick-drying cloth, can be provided with a bulge (strip-shaped, wave-shaped or point-shaped bulge) structure so as to increase the friction force between the quick-drying cloth and the side plates 6-1 and facilitate the firmer clamping.

When the dry cloth clamp 6 is installed, the shaft 6-3 in the middle of the two side plates 6-1 is clamped into the end part 6-4 of the transverse plate 6-2, the inner part is pushed to the top contact closed part as shown in figure 7, the bulge of the limiting rod 6-5 is clamped into the small hole in the end part 6-3, and the dry cloth clamp 6 is installed. When the quick-drying cloth is clamped, the left end or the right end of the friction plug 4 is pressed by hands, so that the dry cloth clamp 6 at the right end or the left end of the blackboard eraser is pushed out, the whole structure of the dry cloth clamp 6 at the right end or the left end is exposed, the two side plates 6-1 rotate by taking the end parts 6-4 as shafts by pressing the upper parts of the two side plates 6-1 inwards, the dry cloth clamp spring 6-6 is stretched, namely the method is consistent with that of a common clamp or a clamping piece, the quick-drying cloth is placed between the two side plates 6-1, the hands are released, and the two side plates 6-1 realize the state of clamping the quick-drying cloth due to the rebounding force of the dry cloth clamp spring 6-6.

When the cleaning blackboard eraser moves leftwards by holding the cleaning blackboard eraser, right transverse friction force is generated between the friction plug 4 and the blackboard, the right transverse friction force presses the flexible steering sheet 14 connected with the right end of the push pull rod 16, the flexible steering sheet 14 converts the right transverse friction force into vertical force (vertical to the blackboard) through the limitation of the steering sheet sliding block 15, namely the dry cloth clamp 6 at the right end of the push pull rod 16 is driven to move downwards, the dry cloth clamp 6 at the right end of the pull rod 16 is contacted with the blackboard, and the passing part of the blackboard eraser, namely the sprayed and wet part on the blackboard opposite to the injection plate 5-1, is wiped. At this time, the dry cloth clamp 6 at the left end of the push-pull rod 16 is tilted upward according to the lever principle.

When the cleaning blackboard eraser moves rightwards by holding the cleaning blackboard eraser, leftward transverse friction force is generated between the friction plug 4 and the blackboard, the leftward transverse friction force presses the flexible steering sheet 14 connected with the left end of the push pull rod 16, the flexible steering sheet 14 converts the leftward transverse friction force into vertical force (vertical to the blackboard) through the limitation of the steering sheet sliding block 15, namely, the dry cloth clamp 6 at the left end of the push pull rod 16 is driven to move downwards, the dry cloth clamp 6 at the left end of the pull rod 16 is contacted with the blackboard, and the passing part of the blackboard eraser, namely, the sprayed and wet part of the blackboard opposite to the injection plate 5-1, is wiped. At this time, the dry cloth clamp 6 at the right end of the push-pull rod 16 is tilted upward according to the lever principle.

Namely, the blackboard to be wiped is firstly wiped by spraying moist sponge on the jet plate 5-1 and then is wiped by the quick-drying cloth on the dry cloth clamp 6.

The upper end of the shell 3 (namely the periphery of the air box 11) is provided with a handle 2, and the section of the handle 2 is in an omega shape. When a user holds the handle 2, the user can naturally hold the handle to be attached to the omega shape, and the user can hold the handle 2 comfortably to facilitate the operation of blackboard eraser.

The use process comprises the following steps: firstly, water is injected into a water tank 13 through a water injection port 18, a water injection port 18 is plugged into a water adding plug 8 of the water tank after water injection, sponge is adhered to 5-1 through a magic tape, a quick-drying cloth is clamped on a dry cloth clamp 6, taking the case that a handheld cleaning blackboard eraser moves leftwards as an example, when the handheld cleaning blackboard eraser moves leftwards, right transverse friction force is generated between a friction plug 4 and a blackboard, the right transverse friction force presses a flexible steering sheet 14 connected with the right end of a push pull rod 16, the flexible steering sheet 14 converts the right transverse friction force into vertical force (perpendicular to the blackboard) through the limitation of a steering sheet slider 15, namely the dry cloth clamp 6 at the right end of the push pull rod 16 is driven to move downwards, the dry cloth clamp 6 at the right end of the pull rod 16 is contacted with the blackboard, and the blackboard eraser is wiped to pass through the position, namely the wet spraying part of the blackboard opposite to the injection plate 5-1 is wiped to be dry. At this time, the dry cloth clamp 6 at the left end of the push-pull rod 16 is tilted upward according to the lever principle.

The wiping principle is as follows: the air tank 11, the water tank 13, the spray tank 5, the spray plate 5-1 and the sponge on the spray plate 5-1 constitute a wiping structure. There are two holes in air box 11, an inlet port 10, an air outlet, and inlet port 10 connects atmosphere and 11 insides of air box, and installs first check valve 17, and gaseous one-way flow to air box 11 by check valve 17, and the air outlet connects water tank 13, and installs second check valve 17, and gaseous 11 flows to water tank 13 by the air box. The air box 11 is also internally provided with a return spring 12 connected with an air inlet switch, the air inlet switch 1 moves inwards by pressing the return spring 12, the volume of the air box 11 is reduced, the pressure in the air box 11 is increased, a pressure difference is formed between the air box 11 and the water tank 13, air enters the water tank 13 from the air outlet through a one-way valve 17, then the return spring 12 recovers the original shape, the volume of the air box 11 is increased, air in the external environment enters the air box 11 from the one-way valve 17 through the air inlet, and the internal pressure and the external pressure of the air box 11 are balanced. Thus, the pressure difference, the elastic deformation and other physical properties are utilized to automatically control the device, resources are reasonably utilized, and unnecessary waste of energy supply by using electric energy is saved. Then the air entering the water tank 13 will increase the pressure inside the water tank 13, push the water to flow into the injection tank 5 from the four third one-way valves 21 at the bottom, spread onto the injection plate 5-1 at the same time, spray out from the injection holes on the injection plate 5-1, spray to the sponge stuck on the injection plate 5-1 by the magic tapes evenly, moisten the sponge evenly, make the sponge wipe the blackboard completely blend the chalk dust produced by the blackboard passing through into the moist sponge, remove the floating chalk dust fundamentally, reduce the dust raising rate.

The drying principle is as follows: the flexible steering sheet 14, the steering sheet sliding block 15, the friction plug 4, the dry cloth clamp 6 and the quick-drying cloth on the dry cloth clamp 6 form a drying structure. According to the movement direction of the practical blackboard eraser in the use process, automatic lifting quick drying cloth is arranged on two sides of a sponge at the bottom end of the blackboard eraser and used for wiping a wet blackboard. The quick-drying cloth is clamped on the dry cloth clamp 6 capable of automatically lifting in different directions, the dry cloth clamp 6 is connected with one end of a flexible steering sheet 14, the flexible steering sheet 14 penetrates through a steering sheet sliding block 15 to change the movement direction of the flexible steering sheet 14, the other end of the flexible steering sheet 14 is connected with a push-pull rod 16, and the push-pull rod 16 is fixed on the friction plug 4. When the blackboard eraser works, friction force generated between the friction plugs 4 at two ends of the bottom of the blackboard eraser and a blackboard is transferred to the push-pull rod 16, the push-pull rod 16 pulls the flexible steering sheet 14 downwards, the direction of the force is changed by the flexible steering sheet 14, the dry cloth clamp 6 is further lifted (retracted) and lowered (pushed), the pushed dry cloth clamp 6 performs quick-dry wiping, and the retracted dry cloth clamp 6 does not work. When the blackboard eraser returns, the same operation as the operation of the blackboard eraser going is carried out, but the direction is opposite, the original working quick-drying cloth is retracted, and the original non-working quick-drying cloth is pushed out to work. In the whole drying process, extra energy does not need to be provided, and the energy (the friction force generated by the relative motion between the friction plug 4 and the blackboard) required when the blackboard is erased is utilized to fully utilize the power required when the blackboard is dried.

Claims

1. A cleaning blackboard eraser is characterized in that: a water tank (13) and an air tank (11) are arranged inside a shell (3) of the blackboard eraser, an air pressure reset spring (12) is arranged inside the air tank (11), one end of the air pressure reset spring (12) is pressed against the inner wall of one side of the air tank (11), and the other end of the air pressure reset spring (12) is pressed against an air inlet switch (1); the air box (11) is communicated with the outside atmosphere, and a first one-way valve (17) is arranged at the communication position of the air box (11) and the outside atmosphere; the air tank (11) is communicated with the water tank (13), and a second one-way valve (20) is arranged at the communication position of the air tank (11) and the water tank (13); the water tank (13) is communicated with the injection tank (5), and a third one-way valve (21) is arranged at the communication position of the water tank (13) and the injection tank (5); a water filling port (18) is arranged on the side of the water tank (13); the bottom of the injection box (5) is provided with an injection plate (5-1), the injection plate (5-1) is provided with a plurality of injection holes, both sides of the bottom of the shell (3) are provided with dry cloth clamps (6), the dry cloth clamps (6) on both sides are connected through a push-pull rod (16), and the push-pull rod (16) is provided with a friction plug (4).

2. The cleaning blackboard eraser of claim 1, wherein: the end part of the push-pull rod (16) is fixedly connected with one end of the flexible steering sheet (14), and the other end of the flexible steering sheet (14) penetrates through the steering sheet sliding block (15) to be fixedly connected with the dry cloth clamp (6).

3. The cleaning blackboard eraser of claim 1, wherein: the bottom of the water tank (13) is provided with a third one-way valve (21), and the water tank (13) is communicated with or separated from the injection tank (5) through the third one-way valve (21).

4. The cleaning blackboard eraser according to claim 2 or 3, wherein: the first check valve (17), the second check valve (20) and the third check valve (21) are consistent in structure, a cover plate (23) with a spring is arranged on each concave groove body (22), and the cover plate (23) is matched with the hole to be closed.

5. The cleaning blackboard eraser of claim 1, wherein: one side of the friction plug (4) contacting with the blackboard is arranged to be a prism-shaped structure.

6. The cleaning blackboard eraser of claim 1, wherein: the upper end of the shell (3) is provided with a handle (2), and the section of the handle (2) is in an omega shape.

7. The cleaning blackboard eraser of claim 1, wherein: the dry cloth clamp (6) is composed of side plates (6-1) on two sides and a transverse plate (6-2), two long edges of the transverse plate (6-2) are respectively connected with the middle shafts of the two side plates (6-1), and the side plates (6-1) on two sides of the transverse plate (6-2) are connected through a dry cloth clamp spring (6-6).