CN210161830U - Special blackboard eraser for water writing board - Google Patents

Abstract

The utility model discloses a special blackboard eraser of board is write to water, special blackboard eraser include wear-resisting absorbent fibre, heating filter screen, blackboard eraser casing, motor, fan, rechargeable battery and switch, the utility model discloses a special blackboard eraser of board is write to water can use like traditional blackboard eraser, can accomplish the drying to the moisture of optional position writing department fast, eliminates the writing to realize the free erasing and writing of writing. The blackboard eraser is simple in structure, low in cost, easy to manufacture, high in working efficiency, low in energy consumption, durable, convenient to use for teachers, good in experience feeling and beneficial to popularization of the water writing technology.

Description

Special blackboard eraser for water writing board

Technical Field

The utility model belongs to the technical field of teaching aid, concretely relates to special blackboard eraser of water writing board.

Background

The water writing technology can effectively solve the problem of dust formed by writing chalk on a blackboard, and the water writing technology generally uses a water writing pen to write on a water writing board (or water writing cloth, the same below). The water written on the water writing board needs to be dried to eliminate the handwriting, but the natural drying time of the water is longer, the existing manual drying technology is full-board drying, the writing and the erasing at any position can not be realized rapidly, the habit of writing and randomly erasing on the blackboard formed by teachers for a long time can not be adapted, various teaching requirements can not be met, and the popularization of the water writing technology is influenced to a great extent.

SUMMERY OF THE UTILITY MODEL

The purpose of the invention is as follows: the utility model aims at providing a water writing board is dedicated, realizes not being restricted by time and handwriting position, freely eliminates the blackboard eraser of handwriting to the not enough that prior art exists.

The technical scheme is as follows: in order to achieve the above purpose, the technical solution adopted by the present invention is as follows: a special eraser for a water writing board comprises wear-resistant water-absorbing fibers, a heating filter screen, an eraser shell, a motor, a fan, a rechargeable battery and a switch; one end of the eraser shell is an open end, the wear-resistant water-absorbing fiber is arranged around the open end of the eraser shell, the heating filter screen is arranged at the inner side of the wear-resistant water-absorbing fiber and fixed in the eraser shell, the motor is fixed at the back part in the eraser shell, the output shaft of the motor is connected with a fan, the fan faces the heating filter screen, and the rechargeable battery is arranged in the eraser shell and opened and arranged on the eraser shell; the heating filter screen, the motor, the rechargeable battery and the switch are electrically connected.

Preferably, the wear-resistant water-absorbing fiber is detachably connected with the blackboard eraser shell.

Preferably, the wear-resistant water-absorbing fiber is fixedly arranged on the fastening frame, a C-shaped groove with a downward opening is arranged on the periphery of the inner side of the opening end of the eraser shell, and the C-shaped groove and the eraser shell are of an integral structure; the fastening frame external diameter equals with C shape inslot internal diameter, and the fastening frame clamps and installs at C shape inslot transition cooperation, and the inner wall in C shape inslot is equipped with the bulge, and the fastening frame periphery is equipped with the concave recess that corresponds with the bulge, and the bulge card plays the chucking effect in the concave recess.

Preferably, the wear-resistant water-absorbing fiber is fixedly arranged on the fastening frame, a C-shaped groove with a downward opening is arranged on the periphery of the inner side of the opening end of the eraser shell, and the C-shaped groove and the eraser shell are of an integral structure; the outer diameter of the fastening frame is slightly smaller than the inner diameter of the C-shaped groove, the thickness of the fastening frame is smaller than the depth of the C-shaped groove, a spring is arranged between the fastening frame and the upper end face of the C-shaped groove, and the upper end of the spring is fixed on the upper end face of the C-shaped groove; the inner wall of the C-shaped groove is provided with at least 2 groups of convex parts, the periphery of the fastening frame is provided with the convex parts corresponding to the convex parts on the inner wall of the C-shaped groove, and the fastening frame is clamped in the C-shaped groove in a clearance fit manner and can move up and down.

Preferably, 4-8 groups of convex parts are arranged on the inner wall of the C-shaped groove and are uniformly arranged on the four corners and the side surfaces of the C-shaped groove, and the number and the positions of the convex parts on the fastening frame correspond to those of the convex parts on the inner wall of the C-shaped groove; and each corner of the C-shaped groove is provided with at least 4 springs.

Preferably, the switch is a slide switch, a button switch or a key switch, and the switch is installed on the left side surface or the right side surface of the outer surface of the blackboard eraser shell.

Preferably, the switch is a reset button switch or a key switch.

Preferably, the switch is a raised head reset button switch or a key switch, the switch is installed on the upper end face of the C-shaped groove, and the thickness of the switch is smaller than the initial height of the spring and larger than the compressed height of the spring.

Has the advantages that: compared with the prior art, the utility model has the advantages of it is following:

the utility model discloses a special blackboard eraser of board is write to water can solve and write the moisture natural drying time of writing department on the board is longer, artifical full dry technical problem of face, can use like traditional blackboard eraser, can accomplish the drying to the moisture of optional position writing department fast, eliminates the writing to realize the free erasing of writing.

The utility model discloses still have following advantage:

1. simple structure, low cost and easy manufacture

The utility model discloses used raw materials or components and parts all have a lot of optional, ripe, low-priced products on the market, and the processing mode is simple and easy, low in manufacturing cost.

2. Wide application range

The utility model discloses can release jointly as the supporting product of water writing board, also can be applied to the occasion that needs free drying moisture, elimination writing such as water writing board as independent product.

3. Convenient to use, experience feeling good

The design enables a teacher to have the hand feeling of using a common blackboard eraser and is convenient to use, the size of the ① blackboard eraser is not much different from that of the common blackboard eraser, the ② wear-resistant water-absorbing fiber design of the blackboard eraser enables the blackboard eraser to flexibly contact a white board, and the ingenious design of the ③ reset switch and the switch position enables the blackboard eraser to be attractive and concise in appearance, the switch can be turned on smoothly when the blackboard eraser is used, and the switch is automatically turned off when the blackboard eraser is not used without additional operation.

4. Good safety and long service life

The heating filter screen of the blackboard eraser can protect internal components, and the peripheral wear-resistant water-absorbing fibers can protect the heating filter screen. The wear-resistant water-absorbing fiber is a consumable material, but can be disassembled and replaced, thereby prolonging the service life of the blackboard eraser.

5. High working efficiency and low energy consumption

The method mainly comprises the following steps of 5 aspects that ① wear-resistant water-absorbing fibers of the eraser are in contact with the water writing plate, the water on part of the water writing plate can be absorbed firstly when the water writing plate is slightly rubbed, ② rubbing can disperse water on writing positions, the thickness of a water layer is reduced, the heating area is increased, the drying efficiency is improved, ③ the space is naturally formed between the inside of the eraser and the water writing plate, the space is small, the air flow rate is high, the evaporation speed of the water is improved, ④ the air in the space circulates and flows back, the air can be heated twice by the electric heating wires when flowing back, the heating efficiency is improved, and ⑤ the space is formed, so that the heat dissipation speed.

6. The method saves resources, reduces the use amount of the white board pen and the chalk, protects the environment, is beneficial to body health and contributes to the popularization of the water writing technology.

Drawings

FIG. 1 is a schematic side view of a water writing board and an eraser;

FIG. 2 is a schematic view of the back of the eraser;

FIG. 3 is a schematic front view of the eraser;

FIG. 4 is a schematic view of the working principle of the eraser;

FIG. 5 is a schematic structural view of the eraser at a partial section A;

FIG. 6 is a schematic structural view of the eraser at a partial section A;

figure 7 is a front cross-sectional schematic view of the eraser housing of figure 6.

Detailed Description

The invention will be further elucidated with reference to the drawing.

As shown in fig. 1, 2 and 3, the eraser special for the water writing board comprises a wear-resistant water-absorbing fiber 21, a heating filter screen 22, an eraser shell 23, a motor 24, a fan 25, a rechargeable battery 26 and a switch 27; one end of the eraser shell 23 is an open end, the wear-resistant water-absorbing fiber 21 is arranged around the open end of the eraser shell 23, the heating filter screen 22 is arranged at the inner side of the wear-resistant water-absorbing fiber 21 and fixed in the eraser shell 23, the motor 24 is fixed at the back part in the eraser shell 23, the output shaft of the motor 24 is connected with the fan 25, the fan 25 faces the heating filter screen 22, the rechargeable battery 26 is arranged in the eraser shell 23, and the opening 27 is arranged on the eraser shell 23; the heating screen 22, the motor 24, the rechargeable battery 26 and the switch 27 are electrically connected.

As shown in fig. 4, the working principle of the present invention is: the charger charges the rechargeable battery 26 (the rechargeable battery 26 is charged through a charging port provided on the surface of the eraser housing 23); when the writing on the water writing plate 1 needs to be freely erased, the switch 27 is turned on, and the water writing plate 1 is freely erased like a blackboard eraser; at the moment, the wear-resistant water-absorbing fiber 21 at the periphery of the eraser 2 rubs the water writing board 1, can absorb a part of moisture, and disperses the relatively concentrated moisture at the handwriting for drying; at the moment, the inside of the eraser 2 and the water writing board 1 jointly form a relatively closed space, the electric energy of a charging battery 26 in the eraser shell 23 is converted into heat energy through a heating wire in the heating filter screen 22 and heats air, a fan 25 in the eraser shell 23 is driven by a motor 24 to blow air, so that hot air forms air backflow in the closed space, and the air flows into the other end in the eraser shell 23 during backflow and forms circulation; in this state, since the closed space is small, the air flow is accelerated, and the air is heated by the heating screen 22 twice in each circulation, the air flow and the heating efficiency can be improved at the same time, so that the moisture on the water writing board 1 can be dried rapidly to eliminate the handwriting.

The wear-resistant water-absorbing fiber 21 and the eraser shell 23 are fixedly connected or detachably connected, wherein the fixedly connected mode is a connecting mode (such as hot melt adhesive bonding) existing in the prior art, and the detailed description is omitted here.

In the embodiment, the wear-resistant water-absorbing fiber 21 is preferably detachably connected with the eraser shell 23, so that the eraser is convenient to replace and maintain, and the service life of the eraser 2 is prolonged.

As shown in fig. 5, the connection mode of the wear-resistant water-absorbing fiber 21 and the eraser shell 23 is fastening and detachable, the wear-resistant water-absorbing fiber 21 is fixedly arranged on the fastening frame 29, the periphery of the inner side of the opening end of the eraser shell 23 is provided with a C-shaped groove with a downward opening, and the C-shaped groove and the eraser shell 23 are of an integral structure; the outer diameter of the fastening frame 29 is equal to the inner diameter of the C-shaped groove, the fastening frame 29 is clamped in the C-shaped groove and installed in a transition fit mode, a protruding portion 231 is arranged on the inner wall of the C-shaped groove, a concave portion 291 corresponding to the protruding portion 231 is arranged on the periphery of the fastening frame 29, and the protruding portion 231 is clamped in the concave portion 291 to play a clamping role. The number of the protruding parts 231 is preferably 2-6 and is uniformly arranged around the C-shaped groove, and the number of the corresponding concave parts 291 on the outer circumference of the fastening frame 29 is equal to the number of the protruding parts 231, and the positions correspond to each other.

In the present embodiment, the switch 27 is directly connected to the rechargeable battery 26, and a common switch in the prior art can be selected, and the switch is classified into: a slide switch, a button switch, a toggle switch, a button switch, a key switch and a membrane switch; the push-button switch (english name: push-button switch) is a switch that uses a push button to push a transmission mechanism, so as to make or break a movable contact and a stationary contact and realize circuit switching. The button switch is a master control electrical appliance with simple structure and wide application; the push-button switch has many kinds of structures, which can be divided into common push-button type, mushroom head type, self-locking type, self-resetting type, rotary handle type, indicator light type, symbol type with light type and key type. The self-locking button switch (namely a normally closed switch) generally has a mechanical locking function, and when the switch is pressed down, the button cannot jump up completely after hands are released, is in a locking state, and needs to be pressed again to unlock and jump up completely. The reset button switch is a switch which is pressed to be powered on and is released to be powered off.

The key switch is mainly a touch key switch, also called as a touch switch. The switch (tactswitch) is touched lightly, when in use, the switch can be switched on by lightly pressing the switch button, and when the hand is released, the switch is switched off, and the internal structure of the switch is switched on and off by the elastic force of the metal elastic sheet. Such as IKI series tact switches. (the function is the same as that of the reset button switch)

The tact switch has been widely used in electric appliances due to its small size and light weight: audio-visual products, digital products, remote controllers, communication products, household appliances, security products, toys, computer products, medical equipment, automobile keys and the like.

The membrane switch is an operation system integrating a key function, an indicating element and an instrument panel. The circuit board consists of four parts, including a panel, an upper circuit, an isolating layer and a lower circuit. When the membrane switch is pressed down, the contact of the upper circuit deforms downwards to be in contact with the polar plate of the lower circuit for conduction, after the finger is loosened, the contact of the upper circuit rebounds, the circuit is disconnected, and the loop triggers a signal. The membrane switch has the advantages of rigorous structure, attractive appearance and good sealing property. Has the characteristics of moisture resistance, long service life and the like. The method is widely applied to the fields of electronic communication and electronic measurement instruments, industrial control, medical equipment, automobile industry, intelligent toys, household appliances and the like.

The utility model is a blackboard eraser with simple structure, so the slide switch, the button switch or the key switch is preferentially selected for the convenience of operation in the selection of the switch 27, and the switch 27 can be arranged on the outer surface (such as the front surface, the upper and lower side surfaces and the left and right side surfaces) of the blackboard eraser shell 23; however, since the user is familiar with grasping the left and right sides of the eraser housing when grasping the eraser, it is preferable to mount the switches 27 on the left and right sides of the eraser housing 23 for the convenience of the operator; further, in order to avoid carelessly forgetting to turn off the switch 27 after the switch 27 is pressed to turn on the power supply in the using process, the switch 27 is preferably a reset button switch or a key switch with a reset function, so that when the blackboard eraser is used, an operator holds the blackboard eraser shell 23 by hand, presses the switch 27 by a thumb, turns on a circuit, works the fan 25 and the heating filter screen 22, releases the thumb after the use, turns off the circuit, and places the blackboard eraser 2 on a table, thereby effectively avoiding the problem of electric energy waste caused by forgetting to turn off the switch 27.

In this embodiment, the reset button switch or the key switch may further be installed on the upper end surface of the C-shaped groove, (where the reset button switch selects the protruding-head reset button switch), at this time, the connection mode of the wear-resistant water-absorbing fiber 21 and the eraser housing 23 is movable and detachable, as shown in fig. 6 and 7, the outer diameter of the fastening frame 29 is slightly smaller than the inner diameter of the C-shaped groove, the thickness of the fastening frame 29 is smaller than the depth of the C-shaped groove, a spring 28 is arranged between the fastening frame 29 and the upper end surface of the C-shaped groove, the upper end of the spring 28 is fixed on the upper end surface of the C-shaped groove, the fastening frame 29 is clamped in the C-shaped groove in a clearance fit manner and can move, the inner wall of the C-shaped groove is provided with a protruding portion 231, the outer periphery of the fastening frame 29 is provided with a protruding portion 292 corresponding to the protruding portion 231, the, has the function of limiting. The initial height of the spring 28 is equal to the distance between the upper end surface of the fastening frame 29 and the upper end surface of the C-shaped groove when the projection 292 on the fastening frame 29 is located above the projection 231 of the inner wall of the C-shaped groove and the two are in contact.

At this time, the inner wall of the C-shaped groove is provided with at least 2 groups of protrusions 231 to prevent the fastening frame 29 from falling off, preferably 4-8 groups of protrusions 231 are provided and uniformly arranged on the four corners and the side surfaces of the C-shaped groove, and the number and the positions of the protrusions 292 on the fastening frame 29 correspond to those of the protrusions 231; and the number of the springs 28 is at least 4, and the springs 28 are arranged at each corner of the C-shaped groove, so that the fastening frame 29 is stressed to be level when moving up and down. The spring 28 acts as a stabilizing and return means preventing the securing frame 29 from moving freely up and down within the C-shaped channel to affect use, and only when subjected to an external force does the securing frame 29 move upwardly to contact the switch 27. The switch 27 may be mounted on the upper end of the C-shaped groove adjacent the spring 28. The thickness of the switch 27 (i.e., the raised-head reset push-button switch or push-button switch) is now less than the initial height of the spring 28 than the height of the spring 28 after it has been fully compressed. The fastening frame 29 is not in contact with the switch 27 under the elastic force of the spring 28 at ordinary times, and the switch 27 is in the off state. When wiping is needed, the eraser 2 is slightly pressed on the water writing board 1 with a little force, the fastening frame 29 is made to approach the eraser shell 23, and the switch 27 is triggered to be in a working state. When the wiping is finished, the hand does not press the blackboard eraser 2 lightly, the fastening frame 29 returns under the elastic force of the spring 28, and the switch 27 is automatically closed, so that the blackboard eraser 2 can be used freely and conveniently. The installation mode can lead the appearance of the blackboard eraser 2 to be more concise and beautiful, the switch 27 does not need to be pressed by the thumb of an operator, and the operation is more convenient.

The above-mentioned detachable connection of the wear-resistant water-absorbing fiber 21 and the eraser housing 23 can also be achieved by selectively installing the switch 27 on the outer surface of the eraser housing 23 (the switch 27 can also be a slide switch, a push-button switch or a push-button switch), and this connection is only a selection of the detachable connection of the wear-resistant water-absorbing fiber 21 and the eraser housing 23.

To facilitate the snapping in and out of the fastening frame 29, the eraser housing 23 is preferably made of plastic.

The eraser 2 is similar to a common eraser in shape and size, but is slightly thicker on the side, and the outer dimension is preferably 140 x 70 x 35 mm.

The abrasion-resistant water-absorbent fibers 21 preferably have a thickness (vertical direction of the water writing board) of 15mm and a width (horizontal direction of the water writing board) of 15 mm.

The fan 25 is preferably made of a plastic material having a diameter of 40mm and a certain high temperature resistance.

The material of the heating screen 22 can be directly electric heating wire, or the electric heating wire and other metal materials are mixed and weaved. The temperature controller (such as XH-W1209 digital temperature controller) is set between the heating filter net 22 and the rechargeable battery 26 to prevent the heating wire from heating accidentally. The technology of heating the electric heating wire by the rechargeable battery is the prior art, such as an electronic cigarette lighter, an electric heating insole and the like disclosed in the prior art. The wear-resistant water-absorbing fibers 21 also serve to protect the heating screen 22.

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 improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. A special board eraser for a water writing board is characterized in that: comprises wear-resistant water-absorbing fibers, a heating filter screen, an eraser shell, a motor, a fan, a rechargeable battery and a switch; one end of the eraser shell is an open end, the wear-resistant water-absorbing fiber is arranged around the open end of the eraser shell, the heating filter screen is arranged at the inner side of the wear-resistant water-absorbing fiber and fixed in the eraser shell, the motor is fixed at the back part in the eraser shell, the output shaft of the motor is connected with a fan, the fan faces the heating filter screen, and the rechargeable battery is arranged in the eraser shell and opened and arranged on the eraser shell; the heating filter screen, the motor, the rechargeable battery and the switch are electrically connected.

2. The special eraser for the water writing board according to claim 1, wherein: the wear-resistant water-absorbing fiber is detachably connected with the blackboard eraser shell.

3. The special eraser for the water writing board according to claim 2, wherein: the wear-resistant water-absorbing fiber is fixedly arranged on the fastening frame, the periphery of the inner side of the opening end of the eraser shell is provided with a C-shaped groove with a downward opening, and the C-shaped groove and the eraser shell are of an integral structure; the fastening frame external diameter equals with C shape inslot internal diameter, and the fastening frame clamps and installs at C shape inslot transition cooperation, and the inner wall in C shape inslot is equipped with the bulge, and the fastening frame periphery is equipped with the concave recess that corresponds with the bulge, and the bulge card plays the chucking effect in the concave recess.

4. The special eraser for the water writing board according to claim 2, wherein: the wear-resistant water-absorbing fiber is fixedly arranged on the fastening frame, the periphery of the inner side of the opening end of the eraser shell is provided with a C-shaped groove with a downward opening, and the C-shaped groove and the eraser shell are of an integral structure; the outer diameter of the fastening frame is slightly smaller than the inner diameter of the C-shaped groove, the thickness of the fastening frame is smaller than the depth of the C-shaped groove, a spring is arranged between the fastening frame and the upper end face of the C-shaped groove, and the upper end of the spring is fixed on the upper end face of the C-shaped groove; the inner wall of the C-shaped groove is provided with at least 2 groups of convex parts, the periphery of the fastening frame is provided with the convex parts corresponding to the convex parts on the inner wall of the C-shaped groove, and the fastening frame is clamped in the C-shaped groove in a clearance fit manner and can move up and down.

5. The special eraser for water writing board according to claim 4, wherein: 4-8 groups of convex parts are arranged on the inner wall of the C-shaped groove and are uniformly arranged on the four corners and the side surfaces of the C-shaped groove, and the number and the positions of the convex parts on the fastening frame correspond to those of the convex parts on the inner wall of the C-shaped groove; and each corner of the C-shaped groove is provided with at least 4 springs.

6. The special eraser for water writing board according to any one of claims 1 to 5, wherein: the switch is a sliding switch, a button switch or a key switch, and the switch is arranged on the left side surface or the right side surface of the outer surface of the blackboard eraser shell.

7. The special eraser for water writing board according to claim 6, wherein: the switch is a reset button switch or a key switch.

8. The special eraser for water writing board according to claim 4 or 5, wherein: the switch is a raised head reset button switch or a key switch, the switch is installed on the upper end face of the C-shaped groove, and the thickness of the switch is smaller than the initial height of the spring and larger than the height of the spring after compression.

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