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

A dust collecting blackboard eraser

technical field

The utility model relates to the technical field of teaching appliances, in particular to a dust-collecting blackboard eraser.

Background technique

In today's China, chalk is still an essential tool for teachers to teach. Almost all teachers use traditional chalk to teach, and the harm caused by chalk dust cannot be ignored. The chalk is composed of calcium carbonate and calcium sulfate, and teachers create a lot of chalk dust when they use it. Because the dust cannot be dissipated as soon as possible, it floats in the air and endangers the health of teachers and students. At the same time, the manufacture and use of chalk will also cause many environmental pollution problems, so it is an urgent need to design a blackboard eraser that can collect dust.

Based on the above situation, a large number of dust-removing blackboard erasers, such as electric blackboard erasers and electrostatic dust-removing blackboard erasers, have appeared on the market today. However, it requires the battery to consume energy and thus causes "battery pollution", which causes more serious harm to the environment, and the cost is relatively high. And after specific use, it is found that its collection effect is not good. Its principle uses wind to generate negative pressure, and then achieves the purpose of absorbing dust. Due to its small negative pressure, the collection effect is not good.

The patent No. "201821799665.3" discloses a mechanical dust-collecting type different-side transfer blackboard eraser. Although it can perform mechanical dust collection, the blackboard eraser will move before the existing dust falls into the collecting device, resulting in the collection of dust. The dust effect is not ideal.

Utility model content

The utility model provides a dust-collecting blackboard eraser in view of the above problems.

In order to achieve the above object, the utility model adopts the following technical solutions:

A dust-collecting blackboard eraser includes a casing, a handle, a transmission mechanism, a working mechanism and a dust-collecting box, the transmission mechanism includes a No. 1 shaft, a No. 2 shaft, a reversing rod and a Y-shaped piece, the reversing rod is provided On the No. 1 shaft, the Y-shaped piece is arranged on the No. 2 shaft, one end of the reversing rod is hinged with the rear end of the Y-shaped piece, and the other end of the reversing rod is hinged with the handle. The two front ends of the Y-shaped pieces are respectively movably provided with a mounting plate; the working mechanism includes a cotton sliver, a mounting plate, a No. 1 gear, a brush, a receiving part and a rotating shaft, and the cotton sliver is mounted on the mounting plate, and is located on the mounting plate. A fixed shaft is arranged below the mounting plate, a No. 1 gear is installed on the fixed shaft, a No. 2 gear corresponding to the No. 1 gear is arranged on the rotating shaft, and the two No. 2 gears are arranged opposite to each other. , brushes are arranged on both sides and the middle of the rotating shaft, the two ends of the rotating shaft are arranged through the two side walls of the bearing member, the bottom of the bearing member is inclined, and the bearing member is arranged in the front of the casing The lower end of the surface is used to receive the dust that has been wiped off; a movable groove is arranged at the rear of the casing, and the handle is arranged at the rear of the casing and can slide in the movable groove. The horn is fixed inside the casing, an opening for the Y-shaped piece to move is arranged on the front wall of the casing, the dust collecting box is a box body with an opening on the front surface, and the dust collecting box is arranged on the casing The front end of the interior is used to collect dust; it also includes a center rod, a No. 1 chute is set on the left and right side panels of the casing, and a baffle is set in the No. 1 chute to prevent the falling dust Block it to help it fall into the receiving part, a positioning plate is also provided on the inner side of the No. 1 chute to limit the baffle plate, and the middle part of the center rod is fixedly connected with the tail end of the Y-shaped piece , the center rod is hollow, and a sliding rod is respectively set at both ends of the center rod, one end of the sliding rod is movably arranged in the hollow structure of the center rod, and the other end of the sliding rod is fixedly provided with A limit block, a No. 1 spring is sleeved on the sliding rod, and the No. 1 spring is located between the limit block and the center rod, and the limit block is hinged with the baffle.

Further, a cotton cloth strip is arranged on the front side of the baffle to prevent the baffle and the blackboard from being damaged by hard contact friction, and at the same time, the blackboard can be wiped twice.

Still further, a rubber edge is arranged on the front side of the receiving part to prevent the hard friction between the receiving part and the blackboard from damaging the blackboard.

Further, the No. 1 gear and the No. 2 gear are bevel gears.

Further, both front ends of the Y-shaped piece are provided with shaft holes, and a No. 3 shaft is arranged in the shaft holes, and the No. 3 shaft is fixedly connected to the mounting plate.

Furthermore, both front ends of the Y-shaped pieces are provided with 20-degree arc openings to limit the rotation angle of the mounting plate.

Further, a push block is arranged inside the dust collecting box, both sides of the dust collecting box are open, a limit plate and a storage device are respectively set at the openings on both sides, and one side of the casing is also A storage box is provided, a push rod is movably arranged in the storage box, and a cross limiter is arranged at the front end of the push rod. The push rod can pass through the limit plate to connect with the push block and control the push block Push the dust in the dust box to the storage device.

Further, the push block is sequentially composed of a cotton cloth layer, a plastic layer and an iron block layer. The cotton cloth layer is used for direct contact with dust, and a limit port is set on the outside of the iron block layer. The inner side of the device is provided with a rotating cavity that communicates with the limit opening, and the plastic layer is provided with a through hole for accommodating the end of the cross limit piece; the limit plate is a magnet.

Further, the storage device includes a storage box, a transition box, a bracket, a control panel, a push plate and a sliding door, the transition box and the bracket are fixed on the side wall of the casing, and the transition box is communicated with the dust collection box, The storage box is movably placed on the bracket and communicated with the transition box. A screw is threaded on one of the side walls of the bracket for fixing the transition box, and the transition box is close to the storage box. There is a No. 3 chute, a sliding door is arranged in the No. 3 chute, the sliding door can be slid into the inside of the casing, and a connecting column is arranged on the side of the upper surface of the sliding door away from the casing, and the sliding door is The connecting column is provided with a roller, the upper surface of the transition box is provided with a No. 2 chute, the control board is arranged above the transition box, the width of the control board is the same as the width of the transition box, and the control board controls The side of the connecting column is inclined and arranged, the push plate is arranged in the transition box, an L-shaped rod is connected to the push plate, and the L-shaped rod passes through the No. 2 chute and is connected to the control board. A control block is arranged above the board.

Further, a limit bar is arranged inside the casing, and a limit slot for limiting the position of the sliding door is formed between the limit bar and the rear wall of the dust box, and a limit groove is formed between the limit bar and the rear wall of the dust collecting box, and the sliding door is close to a side of the casing. A No. 2 spring is arranged on the side, and the other end of the No. 2 spring is connected with the inside of the housing to reset the sliding door.

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

1. The baffle plate provided by the utility model can be extended or retracted with the swing of the Y-shaped piece, which can block and collect dust without hindering the use of the blackboard eraser, and can avoid dust when the blackboard eraser moves. It is too late to fall into the receiving part;

2. The No. 1 and No. 2 gears of the present utility model adopt bevel gears, which are more in line with the needs of right-angle transmission;

3. The utility model is provided with brushes on both sides and the middle of the rotating shaft. The two sides of the receiving part will accumulate more dust than other places due to the left and right movement of the blackboard eraser. Setting brushes on both sides can better collect the dust. into the dust box;

4. The mounting plate of the utility model is connected with the front end of the Y-shaped piece through a rotating shaft, and the angle of the mounting plate can be adjusted automatically to avoid the inclined angle when the sliver is in contact with the blackboard, which cannot work well. The arc-shaped opening is provided, which can limit the rotation angle of the mounting plate, so as to prevent the rotation angle of the non-working mounting plate from being too large and affecting the use of another mounting plate.

Description of drawings

Fig. 1 is the structural representation of the utility model;

2 is a schematic structural diagram of the utility model after removing the upper side wall and the right side wall of the casing;

Fig. 3 is the structural representation of the transmission mechanism of the utility model without the No. 1 shaft and the working mechanism;

4 is a schematic diagram of the installation structure of the Y-shaped piece, the mounting plate and the sliver of the present invention;

Fig. 5 is a partial enlarged view of circle B in Fig. 2 of the utility model;

Fig. 6 is the structural representation of the utility model;

Fig. 7 is the structural representation of the push block of the present invention;

8 is a schematic structural diagram of the storage device of the present invention;

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

Fig. 10 is the structural representation of circle A in Fig. 2 of the utility model;

Fig. 11 is the structural representation of the push rod of the present invention;

Among them, the shell-1, the handle-2, the dust box-3, the first shaft-4, the second shaft-5, the reversing rod-6, the Y-shaped piece-7, the cotton sliver-8, the mounting plate-9, No. 1 gear—10, brush—11, receiving part—12, rotating shaft—13, fixed shaft—14, No. 2 gear—15, movable groove—16, center rod—17, limit block—18, No. 1 slide Slot—19, baffle—20, positioning plate—21, No. 1 spring—24, L-shaped rod—26, shaft hole—27, No. 3 shaft—28, arc opening—29, push block—30, limit Plate—31, Storage Device—32, Storage Box—33, Push Rod—34, Cross Limiter—35, Cotton Layer—36, Plastic Layer—37, Iron Layer—38, Limiting Port—39, Rotation Chamber -40, through hole-41, storage box-42, transition box-43, bracket-44, control board-45, push plate-46, sliding door-47, screw-48, No. 3 chute-49, connecting column —50, No. 2 chute—51, control block—52, roller—53, limit bar—54, limit groove—55, No. 2 spring—56, stopper—57, plunger rod—58, cylinder— 59. Induction bumps - 60, push hands - 61.

Detailed ways

In order to further illustrate the technical solutions of the present utility model, the present utility model will be further described below through examples.

Example 1

As shown in Figures 1 to 11, a dust collecting blackboard eraser includes a casing 1, a handle 2, a transmission mechanism, a working mechanism and a dust collecting box 3. The transmission mechanism includes a No. 1 shaft 4, a No. 2 shaft 5, A reversing rod 6 and a Y-shaped piece 7, the reversing rod 6 is arranged on the No. 1 shaft 4, the Y-shaped piece 7 is arranged on the No. 2 shaft 5, and one end of the reversing rod 6 is connected to the Y-shaped piece 7 is hinged at the rear end, the other end of the reversing rod 6 is hinged with the handle 2, the two front ends of the Y-shaped piece 7 are provided with shaft holes 27, and the third shaft is provided in the shaft holes 27 28 , the third axis 28 is fixedly connected with the mounting plate 9 . Both front ends of the Y-shaped piece 7 are provided with 20-degree arc-shaped openings 29 to limit the rotation angle of the mounting plate 9 . The working mechanism includes a sliver 8, a mounting plate 9, a No. 1 gear 10, a brush 11, a bearing member 12 and a rotating shaft 13. The sliver 8 is mounted on the mounting plate 9 and is arranged below the mounting plate 9. There is a fixed shaft 14, a gear 10 is installed on the fixed shaft 14, a gear 15 corresponding to the gear 10 is arranged on the rotating shaft 13, and the two gears 15 are opposite to each other. , the first gear 10 and the second gear 15 are bevel gears. Brushes 11 are provided on both sides and in the middle of the rotating shaft 13 . Both ends of the rotating shaft 13 are disposed through the two side walls of the receiving member 12 , and the bottom of the receiving member 12 is disposed obliquely. The lower end of the front surface of the housing 1 is used to receive the dust that has been wiped off; the front side of the receiving part 12 is provided with a rubber edge to prevent the hard friction between the receiving part 12 and the blackboard from damaging the blackboard. A movable slot 16 is arranged at the rear of the housing 1 , the handle 2 is arranged at the rear of the housing 1 and can slide in the movable slot 16 , and the first shaft 4 and the second shaft 5 are fixedly arranged Inside the casing 1, an opening for the Y-shaped piece 7 to move is provided on the front wall of the casing 1, the dust collecting box 3 is a box body with an opening on the front surface, and the dust collecting box 3 is arranged in the casing The front end inside the body 1 is used to collect dust; it also includes a central rod 17, a No. 1 chute 19 is provided on the left and right sides of the housing 1, and a baffle 20 is provided in the No. 1 chute 19 , is used to block the falling dust and assist it to fall into the receiving member 12. A cotton cloth strip is arranged on the front side of the baffle 20 to prevent the baffle 20 and the blackboard from being damaged by the hard contact friction of the blackboard. The blackboard is wiped a second time. A positioning plate 21 is also provided on the inner side of the No. 1 chute 19 to limit the baffle plate 20 . The middle part of the center rod 17 is fixedly connected with the rear end of the Y-shaped piece 7 , and the center rod 17 It is hollow and is provided with a sliding rod 22 at both ends of the central rod 17. One end of the sliding rod 22 is movably arranged in the hollow structure of the central rod 17, and the other end of the sliding rod 22 is fixedly provided with A limit block 18 is sleeved with a No. 1 spring 24 on the sliding rod 22 , and the No. 1 spring 24 is located between the limit block 18 and the center rod 17 , and the limit block 18 is hinged with the baffle 20 . A push block 30 is arranged inside the dust collecting box 3. The push block 30 is composed of a cotton cloth layer 36, a plastic layer 37 and an iron block layer 38 in turn. The cotton cloth layer 36 is used for direct contact with dust, and is The outer side of the iron block layer 38 is provided with a limit opening 39, the inner side of the iron block layer 38 is provided with a rotating cavity 40 that communicates with the limit opening 39, and the plastic layer 37 is provided with a cross limiter for accommodating a cross limiter. 35 through hole 41 at the end. The two sides of the dust collecting box 3 are opened, and a limit plate 31 and a storage device 32 are respectively provided at the two openings. The limit plate 31 is a magnet, and one side of the casing 1 is also provided with a storage device 32. Box 33, a push rod 34 is movably arranged in the storage box 33, and the push rod 34 includes a cylinder 59, a plunger rod 58, a plug 57 and a push handle 61, and the plug 57 and the push handle 61 are respectively arranged on the plunger Both ends of the rod 58, and the plug 57 is located inside the cylinder 59, a cross limiter 35 is provided at the front end of the cylinder 59, the end of the cross limiter 35 is an injection hole, and the plunger The rod 58 is evenly provided with a plurality of sensing bumps 60, and a circle of corresponding sensing bumps 60 is annularly arranged in the middle of the inner wall of the cylinder wall. The sensing bumps 60 are elastic materials such as rubber. The cross limiting member 35 can be connected to the push block 30 through the limiting plate 31 , and controls the push block 30 to push the dust in the dust collecting box 3 to the storage device 32 . The storage device 32 includes 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 housing 1, and the transition The box 43 communicates with the dust collecting box 3, the storage box 42 is movably placed on the bracket 44, and communicates with the transition box 43, and a screw 48 is threaded on one of the side walls of the bracket 44 for connecting the transition box. 43 is fixed, a No. 3 chute 49 is provided on the transition box 43 near the storage box 42, and a sliding door 47 is provided in the No. 3 chute 49, and the sliding door 47 can slide into the housing 1 Inside, a connecting column 50 is provided on the side of the upper surface of the sliding door 47 away from the housing 1 , a roller 53 is provided on the connecting column 50 , and a No. 2 chute 51 is provided on the upper surface of the transition box 43 . , the control board 45 is arranged above the transition box 43, the width of the control board 45 is the same as the width of the transition box 43, and the control board 45 controls the side edge of the connecting column 50 to be set obliquely, and the push plate 46 is set at the The transition box 43 is connected to the control board 45 through the second chute 51 , and a control block 52 is arranged above the control board 45 . A limit bar 54 is arranged inside the housing 1 , and a limit groove 55 for limiting the position of the sliding door 47 is formed between the limit bar 54 and the rear wall of the dust box 3 . One side of the housing 1 is provided with a No. 2 spring 56 , and the other end of the No. 2 spring 56 is connected to the interior of the housing 1 to reset the sliding door 47 .

Working principle: Push the handle 2 left and right to adjust the use of the left or right sliver 8. Specifically, when the handle 2 is moved to the left, the right sliver 8 is used, and when the handle 2 is moved to the right, the left sliver 8 is used. When using the cotton sliver 8 on the right, wipe the blackboard from right to left, and at the same time, the baffle 20 on the right extends out to prevent dust from wafting out of the receiving member 12. On the contrary, when using the cotton sliver 8 on the left, wipe the blackboard from left to right. , the baffle 20 on the left extends out to prevent the dust from wafting out of the receiving part 12; the No. 1 gear 10 under the installed sliver 8 rotates with the movement of the sliver 8, and drives the No. 2 gear 15 to rotate, the shaft 13 and the wool The brush 11 rotates with the No. 2 gear 15, sweeps the dust on the receiving part 12 into the dust box 3, after wiping the blackboard, take out the push rod 34 and extend it into the push block 30, and rotate it at a certain angle, so that the push rod 34 not only The push block 30 can be pushed out, or the push block 30 can be pulled back, push the plunger rod 58 to move a distance of a sensing bump, a certain amount of water flows out from the injection hole to soak the cotton cloth layer 36, and then push the push block 30 to push the dust in In the transition box 43, the dust is squeezed into blocks through the soaked cotton cloth layer 36, then the push block 30 is retracted, the push rod 34 is put back into the storage box 33, and the control block 52 is pushed along the second chute 51 to make the control board 45 moves, the inclined end of the control plate 45 opens the sliding door 47, and then the push plate 46 pushes the compressed dust into the storage box 42, and pushes the control block 52 back to reset the control plate 45, and the sliding door 47 is in the second spring. Under the action of 56, it is automatically reset, and the storage box 42 is closed.

While the main features and advantages of the present invention have been shown and described above, it will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but also without departing from the spirit or essential characteristics of the present invention. In the following, the present invention can be realized in other specific forms. Therefore, the embodiments are to be considered in all respects as exemplary and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is therefore intended that the All changes within the meaning and range of the required equivalents are embraced within the present invention.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (10)

1. A dust collecting blackboard eraser, comprising a casing (1), a handle (2), a transmission mechanism, a working mechanism and a dust collecting box (3), the transmission mechanism comprising a No. 1 shaft (4), a No. 2 shaft ( 5), a reversing rod (6) and a Y-shaped piece (7), the reversing rod (6) is arranged on the No. 1 shaft (4), and the Y-shaped piece (7) is arranged on the No. 2 shaft (5) ), one end of the reversing rod (6) is hinged with the rear end of the Y-shaped piece (7), and the other end of the reversing rod (6) is hinged with the handle (2). Two front ends of the component (7) are respectively movably provided with a mounting plate (9); the working mechanism includes a cotton sliver (8), a mounting plate (9), a No. 1 gear (10), a brush (11), a bearing A component (12) and a rotating shaft (13), the cotton sliver (8) is mounted on a mounting plate (9), a fixed shaft (14) is arranged below the mounting plate (9), 14) A No. 1 gear (10) is installed on it, the edge of the No. 1 gear (10) and the front surface of the sliver (8) are on the same plane, and the No. 1 gear (13) is provided on the rotating shaft (13). 10) The corresponding No. 2 gears (15), the two No. 2 gears (15) are arranged opposite to each other, and brushes (11) are provided on both sides and the middle of the rotating shaft (13), and the rotating shaft ( The two ends of 13) are arranged through the two side walls of the receiving member (12), the bottom of the receiving member (12) is arranged obliquely, and the receiving In order to receive the dust that is wiped down; a movable groove (16) is arranged at the rear of the casing (1), and the handle (2) is arranged at the rear of the casing (1), and can be inserted into the movable groove (16). ), the No. 1 shaft (4) and No. 2 shaft (5) are fixedly arranged inside the casing (1), and a Y-shaped piece (7) is provided on the front wall of the casing (1). A movable opening, the dust collecting box (3) is a box body with an opening on the front surface, the dust collecting box (3) is arranged at the front end inside the casing (1), and is used for collecting dust; it is characterized in that: it also includes The center rod (17) is provided with a No. 1 chute (19) on the left and right side panels of the casing (1), and a baffle plate (20) is provided in the No. 1 chute (19) for The falling dust is blocked to help it fall into the receiving member (12), and a positioning plate (21) is also provided on the inner side of the No. 1 chute (19) for limiting the position of the baffle plate (20). , the middle part of the central rod (17) is fixedly connected with the rear end of the Y-shaped piece (7), the central rod (17) is hollow, and a sliding A rod (22), one end of the sliding rod (22) is movably arranged in the hollow structure of the central rod (17), and the other end of the sliding rod (22) is fixedly provided with a limit block (18), where the The sliding rod (22) is sleeved with a No. 1 spring (24), and the No. 1 spring (24) is located between the limit block (18) and the center rod (17), the limit block (18) and the baffle plate (20) Hinge link. 2. A dust-collecting blackboard eraser according to claim 1, characterized in that: a cotton cloth strip is arranged on the front side of the baffle (20) to prevent the baffle (20) from being damaged by hard contact friction with the blackboard The blackboard can be wiped twice at the same time. 3. A dust-collecting blackboard eraser according to claim 1, characterized in that: a rubber edge is provided on the front side of the receiving part (12) to prevent the hard friction damage between the receiving part (12) and the blackboard blackboard. 4. A dust collecting blackboard eraser according to claim 1, characterized in that: the No. 1 gear (10) and the No. 2 gear (15) are bevel gears. 5 . The dust collecting blackboard eraser according to claim 1 , wherein the two front ends of the Y-shaped piece ( 7 ) are provided with shaft holes ( 27 ), and the shaft holes ( 27 ) are located in the shaft holes ( 27 ). 6 . A third shaft (28) is provided, and the third shaft (28) is fixedly connected with the mounting plate (9). 6. A dust-collecting blackboard eraser according to claim 1, characterized in that: both front ends of the Y-shaped piece (7) are provided with 20-degree arc-shaped openings (29) to limit the mounting plate ( 9) of the rotation angle. 7. The dust-collecting blackboard eraser according to claim 1, characterized in that: a push block (30) is provided inside the dust-collecting box (3), and two sides of the dust-collecting box (3) are provided with a push block (30). opening, a limit plate (31) and a storage device (32) are respectively arranged at the openings on both sides, and a storage box (33) is also arranged on one side of the casing (1). ) is movably provided with a push rod (34), a cross limiter (35) is arranged at the front end of the push rod (34), and the push rod (34) can pass through the limit plate (31) and the push block (30) is connected, and the push block (30) is controlled to push the dust in the dust collecting box (3) into the storage device (32). 8 . The dust collecting blackboard eraser according to claim 7 , wherein the push block ( 30 ) is sequentially composed of a cotton cloth layer ( 36 ), a plastic layer ( 37 ) and an iron block layer ( 38 ). The cotton cloth layer (36) is used for direct contact with dust, a limit opening (39) is provided on the outer side of the iron block layer (38), and a limit opening (39) is provided on the inner side of the iron block layer (38). 39) The rotating cavity (40) communicated with each other, the plastic layer (37) is provided with a through hole (41) for accommodating the end of the cross limiter (35); the limiter plate (31) is a magnet. 9 . The dust collecting blackboard eraser according to claim 7 , wherein the storage device ( 32 ) comprises a storage box ( 42 ), a transition box ( 43 ), a bracket ( 44 ), and a control board ( 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), and the transition box (43) is connected to the dust box (3). ) is connected, the storage box (42) is movably placed on the bracket (44), and communicates with the transition box (43), and a screw (48) is threadedly connected to one of the side walls of the bracket (44), using For fixing the transition box (43), a No. 3 chute (49) is provided on the transition box (43) near the storage box (42), and a sliding slot (49) is provided in the No. 3 chute (49) A door (47), the sliding door (47) can be slid into the interior of the casing (1), a connecting column (50) is provided on the side of the upper surface of the sliding door (47) away from the casing (1), The connecting column (50) is provided with a roller (53), the upper surface of the transition box (43) is provided with a No. 2 chute (51), and the control board (45) is arranged on the side of the transition box (43). Above, the width of the control board (45) is the same as the width of the transition box (43), and the control board (45) controls the side edge of the connecting column (50) to be set obliquely, and the push plate (46) is set on the transition box (43), and is connected to the control board (45) through the No. 2 chute (51), and a control block (52) is arranged above the control board (45). 10. A dust collecting blackboard eraser according to claim 9, characterized in that: a limiting bar (54) is arranged inside the casing (1), and the limiting bar (54) is connected to the dust collecting box ( 3) A limit groove (55) for limiting the position of the sliding door (47) is formed between the rear walls, and a No. 2 spring (56) is arranged on the side of the sliding door (47) close to the casing (1). , the other end of the No. 2 spring (56) is connected with the inside of the housing (1) to reset the sliding door (47).

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