CN208164603U - A kind of Environmentally friendly blackboard eraser - Google Patents

Abstract

The utility model discloses a kind of Environmentally friendly blackboard erasers, are related to multimedia teaching teaching aid technical field；It includes bottom case, top shell, erasing layer, motor-driven structure and cleaning roller, bottom case and top shell are mutually covered conjunction or are opened, its internal formation cavity after lid closes, bottom case includes suction inlet, dust retaining wall and bracket, cavity is connected to by suction inlet with outside, cleaning roller includes axis, brush roll and runner, brush roll and runner are located at the centre of dust retaining wall, upper part is located in cavity, its underpart is located at the subjacent of erasing layer, driven by rotating wheel axis and brush roll are rotatablely connected centered on axis with motor-driven structure, and runner and brush roll are slided above and below with respect to bottom case and erasing layer；It realizes efficiently cleaning, inhalation of chalk dust dirt by technologies such as machinery, Electrostatic Absorption, low pressure absorption, and environmentally protective teaching, simple and ingenious structure, sound construction, use is safe, and working service is convenient, and using effect is good, and performance is stablized, and manufacturing cost is low.

Description

A kind of Environmentally friendly blackboard eraser

Technical field

The utility model relates to multimedia teaching teaching aid technical field more particularly to a kind of Environmentally friendly blackboard erasers.

Background technique

Currently, teacher gets used to always chalk-writing teaching, when being wiped using traditional blackboard eraser, dust from flying, both shadows Teachers and students' health is rung, and causes environmental pollution, has an effect on use and the service life of multimedia equipment.Application publication number is CN It is 104149527 A, entitled《Dust absorption blackboard eraser》Utility model patent, utilize rubber roll, axis, rubber friction wheel, solid Fixed pole, drive rod, turbine, worm screw, belt pulley etc. drive fan work, so that air enters from air suction opening, through dust suction chamber, Chu Chen Room, strainer and gas vent discharge, so that dust-filtering is protected environment.The technical solution although solve inhibit dust from flying, The technical problem of environmental protection, but have the following problems：

First, structure is complicated, is easy to break down in use, the case where influencing teaching often occurs.Internal drive knot Structure is complicated, so that structural integrity is poor, use process is easily damaged, and students are general also more naughty, and spoilage is just more Gao Liao；After long-time use, dust accumulation on internal drive mechanism, be driven it is bad, influence using.

Second, water-absorbing sponge needs to filter dust after absorbing water, and due to needing frequent moisturizing, causes use process very not square Just, teaching process is influenced.It is frequently encountered during attending class and needs moisturizing, influence teaching process；Every break, student just it is noted that It checks whether to need moisturizing, operate pretty troublesome.Moreover, during moisturizing, after water meets with chalk dust, it is easy to which lane is everywhere It is mud, it is unhygienic.

Third, due to there are strainer and gas vent, causing its periphery in use process to omit dust, it is easy to make hand dirty. The reason is that strainer can not stop dust to pass through completely.

4th, dust is adsorbed by the draught head that fan is formed, suction is small, low efficiency, environment protecting are poor, and noise is big.

Utility model content

The technical problem to be solved by the utility model is to provide a kind of Environmentally friendly blackboard eraser, by machinery, Electrostatic Absorption, low The technologies such as air pressure absorption, realization efficiently cleaning, inhalation of chalk dust dirt, environmentally protective teaching, simple and ingenious structure, sound construction, Using safe, working service is convenient, and using effect is good, and performance is stablized, and manufacturing cost is low.

In order to solve the above technical problems, technical solution adopted in the utility model is：It includes blackboard eraser body and blackboard eraser lid, The blackboard eraser body include bottom case, be arranged in bottom case bottom erasing layer, motor-driven structure and cleaning roller, the blackboard eraser lid include top Shell, the bottom case and top shell, which are mutually covered, to be closed or opens, its internal formation cavity after lid closes；The bottom case includes being arranged in bottom case Bottom and the suction inlet penetrated through with erasing layer, the dust retaining wall being arranged on suction inlet periphery and the bracket being arranged on bottom case, The cavity is connected to by suction inlet with outside；The cleaning roller includes axis, the brush roll being arranged on axis and runner, the hair Brush roll and runner are located at the centre of dust retaining wall, and upper part is located in cavity, and its underpart is located at the subjacent of erasing layer；It is described Driven by rotating wheel axis and brush roll are rotatablely connected centered on axis with motor-driven structure, the motor-driven structure and the bracket company of sliding above and below It connects, the runner and brush roll are slided above and below with respect to bottom case and erasing layer.

A further technical solution lies in：The motor-driven structure includes the identical first motor-driven structure of two structures and second Motor-driven structure, the bracket include that the structure of dust retaining wall the opposite sides first support of mirror image and second each other is arranged in Frame, the first motor-driven structure are slidably connected above and below with first support；The first motor-driven structure include first axle support plate, Identical first left spring of two structures and the first right spring, the first axle support plate include that first axle connecting plate and setting exist The first hole penetrated through on first axle connecting plate side, and two structures being arranged on first axle connection plate top surface both ends are identical The first left spring under inserting column under inserting column and the first right spring；The first support includes the first pillar and is arranged first First cover board of post top portion, first cover board include the first lid connecting plate and are arranged at the first lid connecting plate bottom surface both ends On identical first left spring of two structures on inserting column on inserting column and the first right spring, the lower end of the first left spring and the Inserting column is plugged and fixed under one left spring, and the upper end of the first left spring is plugged and fixed with inserting column on the first left spring, and first is right The lower end of spring is plugged and fixed with inserting column under the first right spring, and inserting column is inserted on the upper end of the first right spring and the first right spring Fixation is connect, the front end of the axis is rotatably assorted with the first hole.

A further technical solution lies in：First pillar and the first cover board are connected by agreeing with structure, the first pillar Cross-sectional shape be c-type.

A further technical solution lies in：The runner includes identical first runner of two structures and the second runner, institute It states the first runner and the second runner is separately fixed at the two sides of brush roll.

A further technical solution lies in：The junction of the bottom case and top shell is provided with compatible along wall phase interfix It connects, and closes or open by agreeing with structural cover.

A further technical solution lies in：The edge of the runner is provided with antiskid groove.

A further technical solution lies in：It is provided with ventilation groove on the bottom surface of the erasing layer, the cavity passes through Ventilation groove is connected to outside.

A further technical solution lies in：It further includes the hand-held groove that the ellipse of its two sides is arranged in, described hand-held Groove holds groove by the upper half for being located at top shell side and holds what groove was composed positioned at the lower half of drain pan side.

A further technical solution lies in：It further includes magnetic sheet, and magnetic compatible with magnetic sheet is provided in the top shell Piece groove.

A further technical solution lies in：It further includes pull ring, and drawing compatible with pull ring is provided in the top shell Ring groove and pull ring installation part, the pull ring and pull ring installation part are rotatablely connected.

Generated beneficial effect is by adopting the above technical scheme：

First, brush roll high-speed rotation, under the collective effect of cleaning, Electrostatic Absorption and low pressure adsorbent, by chalk dust It is cleaned by suction inlet, the cavity of sucking blackboard eraser, cleaning chalk dust inhibits the significant effect of dust from flying to be promoted；It wipes across Cheng Zhong lifts to continuous and compact blackboard eraser and leaves blackboard and be contacted again blackboard-cleaning, and brush roll is continuous with respect to bottom case and erasing layer Upper and lower sliding, plays the role of similar pump, so that low pressure difference further increases, suction is further increased, chalk dust sucking Effect is further promoted；Without external gas vent, without using water, so that operating with simple, convenient, healthy, environmentally protective teaching； Fan-free, noise is small；Without electricity consumption, low-carbon energy-saving.

Second, first axle support plate is slided above and below by the first left spring and the first right spring, and the second axis support plate passes through Second left spring and the second right spring slide above and below；The front end of axis is rotatably assorted with the first hole, and rear end is matched with the rotation of the second hole It closes；Simple and ingenious structure, sound construction, use is safe, the similar driving member such as bearing-free, will not be by dust accumulation in internal machine In dynamic structure, long-time service performance is stablized, and manufacturing cost is low.

Third, the first cover board are connect by agreeing with structure with the top of the first pillar, the second cover board by agree with structure with The top of second pillar connects, and working service is convenient.

4th, the first runner and the second runner are separately fixed at the two sides of brush roll, which can make brush roll more Steadily, the rotation of high speed, revolving speed is higher, and sweeping efficiency is higher, while it is poor to ensure to be formed advantageous low pressure, and then improves clear The effect managed chalk dust, inhibit dust from flying.

5th, the junction of bottom case and top shell be provided with it is compatible be mutually inserted along wall, bottom case and top shell can be improved The airtightness closed is covered, agreeing with structure can be improved the fastness that lid closes, it is ensured that it is poor to form advantageous low pressure, and then improves clear The effect managed chalk dust, inhibit dust from flying.

6th, antiskid groove can increase the frictional force of itself and blackboard surface, prevent from skidding, and then guarantee that brush roll can High speed rotation, revolving speed is higher, and sweeping efficiency is higher, while it is poor to ensure to be formed advantageous low pressure, and then improves cleaning chalk dust Dirt, the effect for inhibiting dust from flying.

7th, after erasing layer is adjacent to blackboard surface, cavity in blackboard eraser by suction inlet, criss-cross ventilation groove with Outside connection, it is ensured that the effect for forming that advantageous low pressure is poor, and then improving cleaning chalk dust, inhibiting dust from flying.

8th, hold groove be it is oval, the grip feeling of hand is comfortable, hold blackboard eraser it is secured.

9th, blackboard eraser can be adsorbed on varnish board by magnetic sheet, facilitate placement blackboard eraser, due to magnetic sheet, be laid flat after pull ring It is flushed with the upper surface of top shell and is plane, so that the upper surface of top shell and varnish board contact area are big, so magnetic attraction is big, plate Wiping is not easy to fall off from varnish board.

Tenth, pull ring conveniently holds blackboard eraser, or anywhere by blackboard eraser suspension.

Detailed description of the invention

Fig. 1 is the structure chart of the utility model；

Fig. 2 is the cut-away illustration of the utility model；

Fig. 3 is the structure chart of blackboard eraser body in the utility model；

Fig. 4 is the structure chart of blackboard eraser lid in the utility model；

Fig. 5 is the cut-away illustration of the first motor-driven structure in the utility model；

Fig. 6 is the structure chart of bottom case in the utility model；

Fig. 7 is the structure chart of first axle support plate in the utility model；

Fig. 8 is the structure chart of the first cover board in the utility model；

Fig. 9 is the structure chart of cleaning roller in the utility model；

Figure 10 is the structure chart that layer is wiped in the utility model.

Wherein：1 bottom case, 11 suction inlets, 12 dust retaining walls, 13 first pillars, 14 second pillars, 15 first cover boards, 151 Inserting column on one lid connecting plate, 152 first left springs, inserting column, 16 second cover boards, 17 lower half hands on 153 first right springs Hold groove, 2 erasing layers, 3 cleaning rollers, 31 axis, 32 brush rolls, 33 first runners, 34 second runners, 41 first axle support plates, 411 Inserting column under inserting column, 414 first right springs under first axle connecting plate, 412 first holes, 413 first left springs, 5 top shells, on 51 Half portion holds groove, 52 magnetic sheet grooves, 53 pull ring grooves, 54 pull ring installation parts, 6 magnetic sheets, 7 pull rings.

Specific embodiment

Below with reference to the attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear Chu is fully described by, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than whole realities Apply example.Based on the embodiments of the present invention, those of ordinary skill in the art institute without making creative work The every other embodiment obtained, fall within the protection scope of the utility model.

Many details are explained in the following description in order to fully understand the utility model, but this is practical new Type can also be implemented using other than the one described here other way, and those skilled in the art can be without prejudice to this reality With doing similar popularization in the case where novel intension, therefore the utility model is not limited by the specific embodiments disclosed below.

As shown in Fig. 1-Figure 10, the utility model discloses a kind of Environmentally friendly blackboard erasers comprising blackboard eraser body, blackboard eraser lid, magnetic sheet 6 It further include the hand-held groove that the ellipse of its two sides is set with pull ring 7, the blackboard eraser body includes bottom case 1, is arranged in bottom case 1 Bottom erasing layer 2, motor-driven structure and cleaning roller 3.

The bottom case 1 includes 1 bottom of bottom case being arranged in and with the suction inlet 11 of the erasing perforation of layer 2, setting in suction inlet 11 Dust retaining wall 12 on periphery and the bracket being arranged on bottom case 1, further include be set to 1 two sides of bottom case lower half hold it is recessed Slot 17, the bracket include the first support and second support that the structure of 12 opposite sides of dust retaining wall mirror image each other is arranged in, The first support includes the first pillar 13 and the first cover board 15 that cross-sectional shape is c-type, and the first cover board 15 is by agreeing with knot Structure is connect with the top of the first pillar 13, and the second support includes the second pillar 14 and the second lid that cross-sectional shape is c-type Plate 16, the second cover board 16 are connect by agreeing with structure with the top of the second pillar 14, and first cover board 15 includes that the first lid connects Inserting column on fishplate bar 151 and identical first left spring of two structures being arranged on 151 bottom surface both ends of the first lid connecting plate 152 and first inserting column 153 on right spring, second cover board 16 includes the second lid connecting plate and setting in the second lid connection Inserting column on inserting column and the second right spring on identical second left spring of two structures on the both ends of board bottom face.

The blackboard eraser lid includes top shell 5, and the magnetic sheet groove 52 compatible with magnetic sheet 6 and pull ring 7 that are disposed thereon Compatible pull ring groove 53 and pull ring installation part 54 further include the hand-held groove 51 in the upper half for being set to its two sides；It uses Magnetic sheet 6 is bonded in magnetic sheet groove 52 by glue, and magnetic sheet 6 is flushed with the upper surface of top shell 5；On pull ring 7 and pull ring installation part 54 Equipped with through-hole, the through-hole being passed through using screw rod and is connect with nut, pull ring 7 and pull ring installation part 54 are rotatablely connected, and pull ring 7 can be distinguished It is laid flat upward or downward, is laid flat rear its and is flushed with the upper surface of top shell 5；

The junction of the bottom case 1 and top shell 5 be provided with it is compatible be mutually inserted along wall, and by agree with structural cover close Or open, its internal formation cavity, the cavity are connected to by suction inlet 11 with outside after lid closes；The upper half holds recessed Slot 51 and lower half hold the combination of groove 17 and form hand-held groove.

Criss-cross ventilation groove is provided on the bottom surface of the erasing layer 2, the cavity passes through suction inlet 11, leads to Wind groove is connected to outside.

The motor-driven structure includes the identical first motor-driven structure of two structures and the second motor-driven structure, and described first is motor-driven Structure is slidably connected above and below with first support, and the second motor-driven structure is slidably connected above and below with second support；Described first Motor-driven structure includes identical first left spring of 41, two structures of first axle support plate and the first right spring, and described second is motor-driven Structure includes the second axis support plate, identical second left spring of two structures and the second right spring；The first axle support plate 41 Including first axle connecting plate 411 and the first hole 412 penetrated through on 411 side of first axle connecting plate is set, and setting is the Inserting column 413 and the first right spring underthrust under identical first left spring of two structures on one axis connection plate, 411 top surface both ends Connect column 414；The second axis support plate includes the second axis connection plate and second penetrated through on the second axis connection plate side is arranged in Inserting column and second right under hole, and identical second left spring of two structures that is arranged on the second axis connection plate top surface both ends Inserting column under spring；

The lower end of first left spring is plugged and fixed with inserting column 413 under the first left spring, the upper end of the first left spring and the Inserting column 152 is plugged and fixed on one left spring, and the lower end of the first right spring is plugged and fixed with inserting column 414 under the first right spring, The upper end of first right spring is plugged and fixed with inserting column 153 on the first right spring, and the front end of the axis 31 and the first hole 412 rotate Cooperation；The lower end of second left spring is plugged and fixed with inserting column under the second left spring, the upper end of the second left spring and the second left bullet Inserting column is plugged and fixed on spring, and the lower end of the second right spring is plugged and fixed with inserting column under the second right spring, the second right spring Upper end is plugged and fixed with inserting column on the second right spring, and rear end and the second hole of the axis 31 are rotatably assorted.

The cleaning roller 3 includes axis 31, identical first runner, 33 and of 32, two structures of brush roll being arranged on axis 31 Second runner 34, first runner 33 and the second runner 34 are separately fixed at the two sides of brush roll 32, material PP, side Antiskid groove is provided at edge, the brush roll 32, the first runner 33 and the second runner 34 are located at the centre of dust retaining wall 12, Upper part is located in cavity, and its underpart is located at the subjacent of erasing layer 2；

First runner 33 and the second runner 34 with moving axis 31 and brush roll 32 centered on axis 31 with the first axis connection Plate 411 and the rotation connection of the second axis connection plate, the first axle support plate 41 are upper and lower by the first left spring and the first right spring Sliding, the second axis support plate is slided above and below by the second left spring and the second right spring, so that the first runner 33, second Runner 34 and brush roll 32 are slided above and below with respect to bottom case 1 and erasing layer 2.

Application method：It holds the blackboard eraser on blackboard by the hand-held groove of ellipse back and forth to wipe, chalk dust is automatic Wipe, clean, sucking the cavity of the blackboard eraser.Using the dust finished if you need to clear up in the blackboard eraser, blackboard eraser lid only need to be opened, is toppled over Dust in the blackboard eraser.Working service is convenient, and using effect is good.

Technical Analysis：

In use process, under the action of perpendicular to the power on blackboard eraser and blackboard surface, erasing layer 2 is adjacent to blackboard surface, together When the first runner 33, the second runner 34 and brush roll 32 be with respect to bottom case 1 and erasing 2 upward sliding of layer, the first 33, second turns of runner The bottom surface of wheel 34 and brush roll 32 is also adjacent to blackboard surface；Reciprocal wiping motion, so that 34 band of the first runner 33 and the second runner Moving axis 31 and brush roll 32 are with axis 31 for center high-speed rotation；Due to 32 high-speed rotation of brush roll, by chalk dust by inhaling Dirt mouth 11 cleans the cavity into the blackboard eraser, and brush roll 32 and blackboard mantle friction generate electrostatic, and brush roll 32 can be with quiet Electro Sorb chalk dust, while surrounding air generates flowing, so that forming low pressure between the cavity and the external world of upper part Difference, and then chalk dust is sucked to the cavity of the blackboard eraser, under the collective effect of cleaning, Electrostatic Absorption and low pressure adsorbent, cleaning Chalk dust inhibits the significant effect of dust from flying to be promoted.In wiping process, lifts to continuous and compact blackboard eraser and leave blackboard and again Secondary contact blackboard-cleaning, the first runner 33, the second runner 34 and brush roll 32 are constantly upper and lower sliding with respect to bottom case 1 and erasing layer 2 It is dynamic, play the role of similar pump, so that above-mentioned low pressure difference further increases, suction is further increased, chalk dust sucking effect Fruit is further promoted；Without external gas vent, without using water, so that operating with simple, convenient, healthy, environmentally protective teaching；Nothing Fan, noise are small；Without electricity consumption, low-carbon energy-saving.

First axle support plate 41 is slided above and below by the first left spring and the first right spring, and the second axis support plate passes through the Two left springs and the second right spring slide above and below；The front end of the axis 31 is rotatably assorted with the first hole 412, rear end and the second hole It is rotatably assorted；Simple and ingenious structure, sound construction, use is safe, the similar driving member such as bearing-free, will not be by including dust accumulation In the motor-driven structure in portion, long-time service performance is stablized, and manufacturing cost is low.

First cover board 15 is connect by agreeing with structure with the top of the first pillar 13, the second cover board 16 by agree with structure with The top of second pillar 14 connects, and working service is convenient.

First runner 33 and the second runner 34 are separately fixed at the two sides of brush roll 32, which can make brush roll 32 more Add steady, high speed rotation, revolving speed is higher, and sweeping efficiency is higher, while it is poor to ensure to be formed advantageous low pressure, and then improves The effect cleared up chalk dust, inhibit dust from flying.

The junction of bottom case 1 and top shell 5 be provided with it is compatible be mutually inserted along wall, bottom case 1 and top shell 5 can be improved and cover The airtightness of conjunction, agreeing with structure can be improved the fastness that lid closes, it is ensured that it is poor to form advantageous low pressure, and then improves cleaning Chalk dust, the effect for inhibiting dust from flying.

Antiskid groove can increase the frictional force of itself and blackboard surface, prevent from skidding, and then guarantee that brush roll 32 can be high Speed rotation, revolving speed is higher, and sweeping efficiency is higher, while it is poor to ensure to be formed advantageous low pressure, and then improves cleaning chalk dust Dirt, the effect for inhibiting dust from flying.

After erasing layer 2 is adjacent to blackboard surface, cavity in the blackboard eraser by suction inlet 11, criss-cross ventilation groove with Outside connection, it is ensured that the effect for forming that advantageous low pressure is poor, and then improving cleaning chalk dust, inhibiting dust from flying.

Hand-held groove be it is oval, the grip feeling of hand is comfortable, and it is secured to hold blackboard eraser.

The blackboard eraser can be adsorbed on varnish board by magnetic sheet 6, facilitate placement blackboard eraser, due to magnetic sheet 6, be laid flat after pull ring 7 It is flushed with the upper surface of top shell 5 and is plane, so that the upper surface of top shell 5 and varnish board contact area are big, so magnetic attraction is big, Blackboard eraser is not easy to fall off from varnish board.

The convenient hand-held blackboard eraser of pull ring 7, or anywhere by blackboard eraser suspension.

Claims (9)

1. a kind of Environmentally friendly blackboard eraser, it is characterised in that：It includes blackboard eraser body and blackboard eraser lid, and the blackboard eraser body includes bottom case (1), setting In the erasing layer (2) of the bottom of bottom case (1), motor-driven structure and cleaning roller (3), the blackboard eraser lid includes top shell (5), the bottom case (1) with top shell (5) mutually lid conjunction or opening, its internal formation cavity after lid closes；The bottom case (1) includes being arranged in bottom case (1) bottom and with the suction inlet (11) of erasing layer (2) perforation, dust retaining wall (12) on suction inlet (11) periphery be set and set The bracket on bottom case (1) is set, the cavity is connected to by suction inlet (11) with outside；The cleaning roller (3) include axis (31), Brush roll (32) and the runner being arranged on axis (31), the brush roll (32) and runner are located at the centre of dust retaining wall (12), Upper part is located in cavity, and its underpart is located at the subjacent of erasing layer (2)；The driven by rotating wheel axis (31) and brush roll (32) It is rotatablely connected centered on axis (31) with motor-driven structure, the motor-driven structure is slidably connected above and below with bracket, the runner and hair Brush roll (32) slides above and below with respect to bottom case (1) and erasing layer (2)；

The motor-driven structure includes the identical first motor-driven structure of two structures and the second motor-driven structure, and the bracket includes setting In the first support and second support of the structure mirror image each other of dust retaining wall (12) opposite sides, the first motor-driven structure and the One bracket is slidably connected above and below；The first motor-driven structure includes first axle support plate (41), identical first left side of two structures Spring and the first right spring, the first axle support plate (41) include first axle connecting plate (411) and are arranged in the first axis connection The first hole (412) penetrated through on plate (411) side, and two knots being arranged on first axle connecting plate (411) top surface both ends Inserting column (414) under inserting column (413) and the first right spring under identical first left spring of structure；The first support includes first Pillar (13) and the first cover board (15) being arranged at the top of the first pillar (13), first cover board (15) include the first lid connection The grafting on identical first left spring of two structures on first lid connecting plate (151) bottom surface both ends of plate (151) and setting Inserting column (413) is inserted under inserting column (153) on column (152) and the first right spring, the lower end of the first left spring and the first left spring Fixation is connect, the upper end of the first left spring is plugged and fixed with inserting column (152) on the first left spring, the lower end of the first right spring and the Inserting column (414) is plugged and fixed under one right spring, and the upper end of the first right spring and inserting column (153) grafting on the first right spring are solid Fixed, front end and the first hole (412) of the axis (31) are rotatably assorted.

2. a kind of Environmentally friendly blackboard eraser according to claim 1, it is characterised in that：First pillar (13) and the first cover board (15) by agreeing with structure connection, the cross-sectional shape of the first pillar (13) is c-type.

3. a kind of Environmentally friendly blackboard eraser according to claim 2, it is characterised in that：The runner includes two structures identical the One runner (33) and the second runner (34), first runner (33) and the second runner (34) are separately fixed at brush roll (32) Two sides.

4. a kind of Environmentally friendly blackboard eraser according to claim 1, it is characterised in that：The junction of the bottom case (1) and top shell (5) Be provided with it is compatible be mutually inserted along wall, and by agree with structural cover close or open.

5. a kind of Environmentally friendly blackboard eraser according to claim 1, it is characterised in that：It is provided in the edge of the runner anti-skidding Groove.

6. a kind of Environmentally friendly blackboard eraser according to claim 1, it is characterised in that：It is arranged on the bottom surface of erasing layer (2) There is ventilation groove, the cavity is connected to by ventilation groove with outside.

7. a kind of Environmentally friendly blackboard eraser according to claim 1, it is characterised in that：It further includes the ellipse that its two sides is arranged in Hand-held groove, the hand-held groove by be located at top shell (5) side the upper half hold groove (51) and be located at bottom case (1) side Lower half hold groove (17) and be composed.

8. a kind of Environmentally friendly blackboard eraser according to claim 1, it is characterised in that：It further includes magnetic sheet (6), in the top shell (5) it is provided on and magnetic sheet (6) compatible magnetic sheet groove (52).

9. a kind of Environmentally friendly blackboard eraser described in any one of -8 according to claim 1, it is characterised in that：It further includes pull ring (7), It is provided on the top shell (5) and pull ring (7) compatible pull ring groove (53) and pull ring installation part (54), the pull ring (7) it is rotatablely connected with pull ring installation part (54).