CN211592013U - Dust-collecting blackboard eraser - Google Patents

Abstract

The utility model relates to a teaching aid technical field, concretely relates to collection dirt blackboard eraser. Including casing and central rod, be provided with the spout No. one on the board of the left and right sides of casing, be provided with the baffle in the spout No. one, inboard at the spout still is provided with the locating plate, the middle part of well core rod and the tail end fixed connection of Y type spare, well core rod is the cavity setting, both ends at well core rod are provided with a slide bar respectively, the one end activity of slide bar sets up in well core rod's hollow structure, the other end of slide bar is fixed and is provided with a stopper, the cover is equipped with a spring on the slide bar, and a spring is located between stopper and the central rod, stopper and baffle hinge joint. The utility model discloses the baffle that sets up can stretch out or retract along with the swing of Y type spare, can block the dust and collect under the condition that does not hinder the blackboard eraser use, when can avoiding the blackboard eraser to remove, avoids the dust to come too late the condition that falls into the accepting to appear.

Description

Dust-collecting blackboard eraser

Technical Field

The utility model relates to a teaching aid technical field, concretely relates to collection dirt blackboard eraser.

Background

In China, chalks are still a necessary tool for teachers to give lessons, almost all teachers use traditional chalks to give lessons, and harm caused by dust of the chalks cannot be ignored. The chalk is made of calcium carbonate and calcium sulfate, and teachers can generate a large amount of chalk dust when using the chalk. The dust cannot be scattered as soon as possible and floats in the air, so that the dust harms the health of teachers and students. Meanwhile, the manufacture and use of chalks also cause a lot of environmental pollution problems, so that the design of a blackboard eraser capable of collecting dust is an urgent need.

Based on the above situation, a large number of dust-removing blackboard erasers, such as electric blackboard erasers, electrostatic dust-removing blackboard erasers, etc., appear on the market today. But it requires batteries to consume energy and thus "battery pollution", poses more serious environmental hazards, and requires higher costs. The specific use shows that the collection effect is not good, and the principle utilizes wind power to generate negative pressure so as to achieve the purpose of absorbing dust. The collecting effect is not good because its negative pressure is small.

Patent No. 201821799665.3 discloses a mechanical dust-collecting type different-side transfer blackboard eraser, which can collect dust mechanically, but the dust does not fall into the collecting device, the blackboard eraser moves, and the dust collecting effect is not ideal.

SUMMERY OF THE UTILITY MODEL

The utility model provides a collection dirt blackboard eraser to above-mentioned problem.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a dust collection blackboard eraser comprises a shell, a handle, a transmission mechanism, a working mechanism and a dust collection box, wherein the transmission mechanism comprises a first shaft, a second shaft, a reversing rod and a Y-shaped part, the reversing rod is arranged on the first shaft, the Y-shaped part is arranged on the second shaft, one end of the reversing rod is hinged with the tail end of the Y-shaped part, the other end of the reversing rod is hinged with the handle, and two mounting plates are movably arranged at the two front ends of the Y-shaped part respectively; the working mechanism comprises a cotton sliver, an installation plate, a first gear, a hairbrush, a receiving piece and a rotating shaft, wherein the cotton sliver is installed on the installation plate, a fixed shaft is arranged below the installation plate, the first gear is installed on the fixed shaft, a second gear corresponding to the first gear is arranged on the rotating shaft, the two second gears are arranged in a back-to-back mode, the hairbrushes are arranged on two sides and in the middle of the rotating shaft, two ends of the rotating shaft penetrate through two side walls of the receiving piece, the bottom of the receiving piece is arranged in an inclined mode, and the receiving piece is arranged at the lower end of the front surface of the shell and used for receiving the wiped dust; the rear part of the shell is provided with a movable groove, the handle is arranged at the rear part of the shell and can slide in the movable groove, the first shaft and the second shaft are fixedly arranged in the shell, the front wall of the shell is provided with an opening for the movement of a Y-shaped part, the dust collection box is a box body with an opening on the front surface, and the dust collection box is arranged at the front end in the shell and used for collecting dust; still include well core rod be provided with the spout on the left and right sides board of casing No. one be provided with the baffle in the spout for stop the dust of whereabouts, supplementary it falls into in the accepting the piece the inboard of spout still is provided with the locating plate, is used for spacing the baffle, well core rod's middle part and the tail end fixed connection of Y type spare, well core rod is the cavity setting well core rod's both ends are provided with a slide bar respectively, the one end activity of slide bar sets up in well core rod's hollow structure, the other end of slide bar is fixed and is provided with a stopper the cover is equipped with a spring on the slide bar, and a spring is located between stopper and the center bar, the stopper articulates with the baffle.

Further, the front side edge of the baffle is provided with a cotton cloth strip to prevent the hard contact friction between the baffle and the blackboard from damaging the blackboard, and the blackboard can be wiped secondarily.

Still further, the front side edge of the bearing piece is provided with a rubber edge to prevent the hard friction between the bearing piece and the blackboard from damaging the blackboard.

Further, the first gear and the second gear are bevel gears.

Furthermore, two front ends of the Y-shaped part are provided with shaft holes, a third shaft is arranged in the shaft holes, and the third shaft is fixedly connected with the mounting plate.

Further, two front ends of the Y-shaped part are provided with 20-degree arc-shaped openings to limit the rotation angle of the mounting plate.

Furthermore, the inside of dust collection box is provided with the ejector pad, the both sides opening of dust collection box sets up limiting plate and storage device respectively at both sides opening part one of them one side of casing still is provided with the case the activity is provided with the push rod in the case the front end of push rod is provided with the cross locating part, the push rod can pass the limiting plate and be connected with the ejector pad to control the ejector pad with dust propelling movement in the dust collection box to the storage device in.

Furthermore, the push block sequentially comprises a cotton cloth layer, a plastic layer and an iron block layer, the cotton cloth layer is used for directly contacting dust, a limiting opening is formed in the outer side of the iron block layer, a rotating cavity communicated with the limiting opening is formed in the inner side of the iron block layer, and a through hole used for accommodating the end head of the cross limiting part is formed in the plastic layer; the limiting plate is a magnet.

Furthermore, the storage device comprises a storage box, a transition box, a support, a control panel, a push plate and a sliding door, wherein the transition box and the support are fixed on the side wall of the shell, the transition box is communicated with the dust collection box, the storage box is movably placed on the support and is communicated with the transition box, a screw is connected to one side wall of the support in a threaded manner and is used for fixing the transition box, a third sliding groove is formed in the position, close to the storage box, of the transition box, a sliding door is arranged in the third sliding groove and can slide into the shell, a connecting column is arranged on one side, far away from the shell, of the upper surface of the sliding door, a roller is arranged on the connecting column, a second sliding groove is formed in the upper surface of the transition box, the control panel is arranged above the transition box, the width of the control panel is the same as that of the transition box, and the side edge of the control connecting column, the push plate is arranged in the transition box, an L-shaped rod is connected to the push plate, the L-shaped rod penetrates through the second sliding groove to be connected with the control panel, and a control block is arranged above the control panel.

Furthermore, a limiting strip is arranged inside the shell, a limiting groove for limiting the sliding door is formed between the limiting strip and the rear wall of the dust collection box, a second spring is arranged on one side, close to the shell, of the sliding door, and the other end of the second spring is connected with the inside of the shell so as to reset the sliding door.

Compared with the prior art, the utility model has the advantages of it is following:

1. the baffle arranged in the utility model can extend out or retract along with the swing of the Y-shaped part, so that the dust can be blocked and collected without hindering the use of the blackboard eraser, and the situation that the dust is too late to fall into the receiving part when the blackboard eraser moves can be avoided;

2. the first gear and the second gear of the utility model both adopt bevel gears to meet the requirements of right-angle transmission;

3. the two sides and the middle part of the rotating shaft are provided with the hairbrushes, more dust can be accumulated on the two sides of the bearing piece than other places due to the left and right movement of the blackboard eraser, and the hairbrushes arranged on the two sides can better collect the dust into the dust collecting box;

4. the utility model discloses the mounting panel is connected through the pivot with the front end of Y type spare, and the angle of mounting panel can be adjusted automatically, is inclination when avoiding silver and blackboard contact, and the work that carries on that can not be fine has set up the arc opening at the front end of Y type spare simultaneously, can restrict the turned angle of mounting panel, and it is too big to avoid inoperative mounting panel turned angle, influences the use of another mounting panel.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the present invention with the upper side wall and the right side wall of the housing removed;

FIG. 3 is a schematic structural view of the transmission mechanism without a first shaft and a working mechanism according to the present invention;

fig. 4 is a schematic view of the mounting structure of the Y-shaped member, the mounting plate and the cotton sliver of the present invention;

FIG. 5 is an enlarged view of a portion of circle B of FIG. 2 according to the present invention;

fig. 6 is a schematic structural view of the present invention;

fig. 7 is a schematic structural view of the push block of the present invention;

fig. 8 is a schematic structural view of the storage device of the present invention;

fig. 9 is an exploded view of the storage device of the present invention;

fig. 10 is a schematic structural view of a circle a in fig. 2 according to the present invention;

fig. 11 is a schematic structural view of the push rod of the present invention;

wherein the device comprises a shell body-1, a handle-2, a dust collecting box-3, a first shaft-4, a second shaft-5, a reversing rod-6, a Y-shaped part-7, a cotton sliver-8, a mounting plate-9, a first gear-10, a brush-11, a bearing part-12, a rotating shaft-13, a fixed shaft-14, a second gear-15, a movable groove-16, a central rod-17, a limiting block-18, a first sliding groove-19, a baffle-20, a positioning plate-21, a first spring-24, an L-shaped rod-26, a shaft hole-27, a third shaft-28, an arc opening-29, a pushing block-30, a limiting plate-31, a storage device-32, a storage box-33, a pushing rod-34, a cross limiting piece-35, a cotton cloth layer-36, a plastic layer-37, an iron block layer-38, a limiting port-39, a rotating cavity-40, a through hole-41, a storage box-42, a transition box-43, a support-44, a control plate-45, a pushing, The device comprises a screw-48, a third sliding groove-49, a connecting column-50, a second sliding groove-51, a control block-52, a roller-53, a limiting strip-54, a limiting groove-55, a second spring-56, a plug-57, a plunger rod-58, a barrel-59, an induction bump-60 and a push handle-61.

Detailed Description

In order to further illustrate the technical solution of the present invention, the present invention is further explained by the following embodiments.

Example 1

As shown in fig. 1 to 11, a dust collecting blackboard eraser comprises a shell 1, a handle 2, a transmission mechanism, a working mechanism and a dust collecting box 3, wherein the transmission mechanism comprises a first shaft 4, a second shaft 5, a reversing rod 6 and a Y-shaped part 7, the reversing rod 6 is arranged on the first shaft 4, the Y-shaped part 7 is arranged on the second shaft 5, one end of the reversing rod 6 is hinged with the tail end of the Y-shaped part 7, the other end of the reversing rod 6 is hinged with the handle 2, two front ends of the Y-shaped part 7 are respectively provided with a shaft hole 27, a third shaft 28 is arranged in the shaft hole 27, and the third shaft 28 is fixedly connected with a mounting plate 9. Both front ends of the Y-shaped member 7 are provided with 20 degree arc openings 29 to limit the rotation angle of the mounting plate 9. The operating mechanism includes silver 8, mounting panel 9, a gear 10, brush 11, acceptor 12 and pivot 13, the silver 8 is installed on mounting panel 9 the below of mounting panel 9 is provided with dead axle 14 install a gear 10 on the dead axle 14 be provided with No. two gears 15 corresponding with a gear 10 on the pivot 13, two No. two gears 15 set up back to back, a gear 10 and No. two gears 15 are bevel gear. Brushes 11 are arranged on two sides and the middle of the rotating shaft 13, two ends of the rotating shaft 13 penetrate through two side walls of the bearing piece 12, the bottom of the bearing piece 12 is obliquely arranged, and the bearing piece 12 is arranged at the lower end of the front surface of the shell 1 and used for bearing the wiped dust; the front side of the bearing piece 12 is provided with a rubber edge to prevent the hard friction between the bearing piece 12 and the blackboard from damaging the blackboard. A movable groove 16 is arranged at the rear part of the shell 1, the handle 2 is arranged at the rear part of the shell 1 and can slide in the movable groove 16, the first shaft 4 and the second shaft 5 are fixedly arranged in the shell 1, an opening for moving the Y-shaped part 7 is arranged on the front wall of the shell 1, the dust collection box 3 is a box body with an opening on the front surface, and the dust collection box 3 is arranged at the front end in the shell 1 and is used for collecting dust; still include well core rod 17 be provided with a spout 19 on the left and right sides board of casing 1 be provided with baffle 20 in the spout 19 for stop the dust of whereabouts, supplementary it falls into in receiving 12 baffle 20 front side limit is provided with cotton cloth strip, in order to prevent the hard contact friction damage blackboard of backstop 20 and blackboard, can carry out the secondary to the blackboard simultaneously and clean. A spout 19's inboard still is provided with locating plate 21 for it is spacing to carry out baffle 20, the middle part of well core rod 17 and the tail end fixed connection of Y type spare 7, well core rod 17 is the cavity setting well core rod 17's both ends are provided with a slide bar 22 respectively, the one end activity of slide bar 22 sets up in well core rod 17's hollow structure, the other end of slide bar 22 is fixed and is provided with a stopper 18 the cover is equipped with a spring 24 on the slide bar 22, and a spring 24 is located between stopper 18 and the core rod 17, stopper 18 and baffle 20 hinge joint. The dust collection box 3 is internally provided with a push block 30, the push block 30 sequentially comprises a cotton cloth layer 36, a plastic layer 37 and an iron block layer 38, the cotton cloth layer 36 is used for directly contacting dust, a limiting port 39 is arranged on the outer side of the iron block layer 38, a rotating cavity 40 communicated with the limiting port 39 is arranged on the inner side of the iron block layer 38, and the plastic layer 37 is provided with a through hole 41 for accommodating the end of the cross limiting piece 35. The dust collecting box 3 is provided with openings at two sides, a limit plate 31 and a storage device 32 are respectively arranged at the openings at two sides, the limit plate 31 is a magnet, a storage box 33 is further arranged at one side of the shell 1, a push rod 34 is movably arranged in the storage box 33, the push rod 34 comprises a barrel 59, a plunger rod 58, a plug 57 and a push handle 61, the plug 57 and the push handle 61 are respectively arranged at two ends of the plunger rod 58, the plug 57 is positioned in the barrel 59, a cross limiting member 35 is arranged at the front end of the barrel 59, the end of the cross limiting member 35 is an injection hole, a plurality of induction salient points 60 are uniformly arranged on the plunger rod 58, a circle of corresponding induction salient points 60 are annularly arranged at the middle position of the inner wall of the barrel wall, the induction salient points 60 are made of elastic materials such as rubber, and the cross limiting member 35 of the push rod 34 can penetrate through, and controls the pushing block 30 to push the dust in the dust collecting box 3 into the storage device 32. The storage device 32 comprises a storage box 42, a transition box 43, a bracket 44, a control panel 45, a push plate 46 and a sliding door 47, the transition box 43 and the bracket 44 are fixed on the side wall of the casing 1, the transition box 43 is communicated with the dust collection box 3, the storage box 42 is movably placed on the bracket 44 and is communicated with the transition box 43, a screw 48 is connected with one side wall of the bracket 44 in a threaded manner and is used for fixing the transition box 43, a third sliding groove 49 is arranged on the transition box 43 close to the storage box 42, a sliding door 47 is arranged in the third sliding groove 49, the sliding door 47 can slide into the casing 1, a connecting column 50 is arranged on one side of the upper surface of the sliding door 47 far away from the casing 1, a roller 53 is arranged on the connecting column 50, a second sliding groove 51 is arranged on the upper surface of the transition box 43, the control panel 45 is arranged above the transition box 43, the width of control panel 45 is the same with the width of transition box 43, and the side slope setting of control panel 45 control connection post 50, push pedal 46 sets up in transition box 43, and passes No. two spout 51 and be connected with control panel 45 the top of control panel 45 is provided with control block 52. A limiting strip 54 is arranged inside the shell 1, a limiting groove 55 for limiting the sliding door 47 is formed between the limiting strip 54 and the rear wall of the dust collection box 3, a second spring 56 is arranged on one side of the sliding door 47 close to the shell 1, and the other end of the second spring 56 is connected with the inside of the shell 1 so as to reset the sliding door 47.

The working principle is as follows: pushing the handle 2 left and right to adjust and use the cotton sliver 8 on the left side or the right side, specifically, moving the handle 2 to the left side to use the cotton sliver 8 on the right side and to the right side to use the cotton sliver 8 on the left side, wiping the blackboard from right to left when using the cotton sliver 8 on the right side, and simultaneously extending the baffle 20 on the right side to stop the dust from drifting out of the receiving piece 12, or conversely, wiping the blackboard from left to right when using the cotton sliver 8 on the left side, extending the baffle 20 on the left side to stop the dust from drifting out of the receiving piece 12; the first gear 10 arranged below the cotton sliver 8 rotates along with the movement of the cotton sliver 8 and drives the second gear 15 to rotate, the rotating shaft 13 and the brush 11 rotate along with the second gear 15 to sweep the dust on the receiving piece 12 into the dust collection box 3, the push rod 34 is taken out after the blackboard is wiped and extends into the push block 30 and rotates for a certain angle, so that the push rod 34 can push out the push block 30 and pull back the push block 30, the plunger rod 58 is pushed to move for a distance of sensing a salient point, a certain amount of water flows out of the cotton cloth layer 36 from an injection hole, then the push block 30 is pushed to push the dust into the transition box 43, the dust is extruded into blocks through the soaked cotton cloth layer 36, then the push block 30 is retracted, the push rod 34 is placed back into the storage box 33, the control block 52 is pushed along the second sliding groove 51 to move the control plate 45, the inclined end of the control plate 45 props up the sliding door 47, and then the push plate 46 pushes the dust compressed into the, the push-back control block 52 resets the control panel 45, and the sliding door 47 automatically resets under the action of the second spring 56 to close the storage box 42.

The essential features and advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. A dust collection blackboard eraser comprises a shell (1), a handle (2), a transmission mechanism, a working mechanism and a dust collection box (3), wherein the transmission mechanism comprises a first shaft (4), a second shaft (5), a reversing rod (6) and a Y-shaped part (7), the reversing rod (6) is arranged on the first shaft (4), the Y-shaped part (7) is arranged on the second shaft (5), one end of the reversing rod (6) is hinged with the tail end of the Y-shaped part (7), the other end of the reversing rod (6) is hinged with the handle (2), and two mounting plates (9) are movably arranged at the two front ends of the Y-shaped part (7) respectively; the working mechanism comprises a cotton sliver (8), a mounting plate (9), a first gear (10), a hairbrush (11), an adapting piece (12) and a rotating shaft (13), the cotton sliver (8) is mounted on the mounting plate (9), a fixed shaft (14) is arranged below the mounting plate (9), the first gear (10) is mounted on the fixed shaft (14), the edge of the first gear (10) and the front surface of the cotton sliver (8) are on the same plane, a second gear (15) corresponding to the first gear (10) is arranged on the rotating shaft (13), the two second gears (15) are arranged oppositely, the hairbrush (11) is arranged on the two sides and the middle part of the rotating shaft (13), the two ends of the rotating shaft (13) penetrate through the two side walls of the adapting piece (12), the bottom of the adapting piece (12) is obliquely arranged, the adapting piece (12) is arranged at the lower end of the front surface of the shell (1), used for receiving the dust after being wiped; a movable groove (16) is formed in the rear portion of the shell (1), the handle (2) is arranged at the rear portion of the shell (1) and can slide in the movable groove (16), the first shaft (4) and the second shaft (5) are fixedly arranged in the shell (1), an opening for moving a Y-shaped part (7) is formed in the front wall of the shell (1), the dust collection box (3) is a box body with an opening in the front surface, and the dust collection box (3) is arranged at the front end of the interior of the shell (1) and used for collecting dust; the method is characterized in that: still include well core rod (17), be provided with a spout (19) on the board of the left and right sides of casing (1) be provided with baffle (20) in spout (19) for stop the dust of whereabouts, supplementary it falls into in accepting piece (12), the inboard of a spout (19) still is provided with locating plate (21) for spacing baffle (20), the middle part of well core rod (17) and the tail end fixed connection of Y type spare (7), well core rod (17) is the cavity setting, be provided with a slide bar (22) respectively at the both ends of well core rod (17), the one end activity of slide bar (22) sets up in the hollow structure of well core rod (17), the other end of slide bar (22) is fixed and is provided with a stopper (18), the cover is equipped with spring (24) No. on slide bar (22), and a first spring (24) is positioned between the limiting block (18) and the central rod (17), and the limiting block (18) is hinged with the baffle (20).

2. A dust collecting blackboard eraser in accordance with claim 1, wherein: the front side edge of the baffle (20) is provided with a cotton cloth strip to prevent the hard contact friction between the baffle (20) and the blackboard from damaging the blackboard and simultaneously can perform secondary wiping on the blackboard.

3. A dust collecting blackboard eraser in accordance with claim 1, wherein: the front side edge of the bearing piece (12) is provided with a rubber edge to prevent the hard friction between the bearing piece (12) and the blackboard from damaging the blackboard.

4. A dust collecting blackboard eraser in accordance with claim 1, wherein: the first gear (10) and the second gear (15) are bevel gears.

5. A dust collecting blackboard eraser in accordance with claim 1, wherein: two front ends of Y type spare (7) all are provided with shaft hole (27) be provided with No. three axle (28) in shaft hole (27), No. three axle (28) and mounting panel (9) fixed connection.

6. A dust collecting blackboard eraser in accordance with claim 1, wherein: two front ends of the Y-shaped part (7) are provided with 20-degree arc-shaped openings (29) so as to limit the rotation angle of the mounting plate (9).

7. A dust collecting blackboard eraser in accordance with claim 1, wherein: the inside of dust collection box (3) is provided with ejector pad (30), the both sides opening of dust collection box (3) sets up limiting plate (31) and storage device (32) respectively at both sides opening part one of them one side of casing (1) still is provided with case (33) internalization is provided with push rod (34) the front end of push rod (34) is provided with cross locating part (35), limiting plate (31) can be passed in push rod (34) and push pad (30) are connected to control ejector pad (30) with the dust propelling movement in dust collection box (3) to storage device (32) in.

8. A dust collecting blackboard eraser in accordance with claim 7, wherein: the pushing block (30) sequentially comprises a cotton cloth layer (36), a plastic layer (37) and an iron block layer (38), the cotton cloth layer (36) is used for directly contacting dust, a limiting opening (39) is formed in the outer side of the iron block layer (38), a rotating cavity (40) communicated with the limiting opening (39) is formed in the inner side of the iron block layer (38), and a through hole (41) used for accommodating the end of the cross limiting piece (35) is formed in the plastic layer (37); the limiting plate (31) is a magnet.

9. A dust collecting blackboard eraser in accordance with claim 7, wherein: the storage device (32) comprises a storage box (42), a transition box (43), a support (44), a control panel (45), a push plate (46) and a sliding door (47), the transition box (43) and the support (44) are fixed on the side wall of the shell (1), the transition box (43) is communicated with the dust collection box (3), the storage box (42) is movably placed on the support (44) and is communicated with the transition box (43), one side wall of the support (44) is in threaded connection with a screw (48) for fixing the transition box (43), a third sliding groove (49) is formed in the position, close to the storage box (42), of the transition box (43), the sliding door (47) is arranged in the third sliding groove (49), the sliding door (47) can slide into the shell (1), and a connecting column (50) is arranged on one side, far away from the shell (1), of the upper surface of the sliding door (47), be provided with gyro wheel (53) on spliced pole (50) transition box (43) upper surface is provided with No. two spout (51), control panel (45) set up the top at transition box (43), the width of control panel (45) is the same with the width of transition box (43), and the side slope setting of control panel (45) control spliced pole (50), push pedal (46) set up in transition box (43), and pass No. two spout (51) and be connected with control panel (45) the top of control panel (45) is provided with control block (52).

10. A dust collecting blackboard eraser in accordance with claim 9, wherein: the dust collection box is characterized in that a limiting strip (54) is arranged inside the shell (1), a limiting groove (55) for limiting the sliding door (47) is formed between the limiting strip (54) and the rear wall of the dust collection box (3), a second spring (56) is arranged on one side, close to the shell (1), of the sliding door (47), and the other end of the second spring (56) is connected with the inside of the shell (1) to reset the sliding door (47).

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