A dust-free blackboard eraser that can be turned over

Abstract

The invention relates to the technical field of blackboard erasers, and specifically to a flippable dust-free blackboard eraser, comprising a shell, a sponge assembly installed at the bottom of the shell, a slapping assembly connected to the side walls of the inner cavity of the shell, a dust collection assembly installed at the top of the shell, mounting grooves symmetrically provided on opposite side walls of the shell, a roller with a concave cross-section rotatably connected between the inner walls of the mounting grooves, a driving gear provided on the bottom of the groove of the roller, a first driven gear meshing with the driving gear rotatably connected between the inner walls of the mounting grooves, a transmission shaft of the first driven gear being connected to the slapping assembly, and the blackboard eraser of the invention can be flipped over to the shell after one side has been used for a period of time, and then the slapping assembly is synchronously driven to work by the roller during wiping of the other side, thereby slapping and cleaning one side of the shell, and at the same time, the dust collection assembly collects chalk dust generated by slapping, thereby achieving dust-free cleaning of the blackboard eraser without causing environmental pollution.

Description

Technical Field

[0001] The invention relates to the technical field of blackboard erasers, in particular to a flippable dust-free blackboard eraser. Background Art

[0002] Blackboards are essential teaching tools in classroom teaching. After writing, they need to be wiped with a blackboard eraser. During the wiping process, chalk dust adheres to the sponge of the blackboard eraser, resulting in subsequent wiping that is not clean. Therefore, users need to intermittently tap the blackboard eraser to remove the chalk dust adhered to the sponge before wiping. During the tapping process, a large amount of chalk dust will splash, causing environmental pollution and endangering the health of students and users. Therefore, the present invention has developed a reversible dust-free blackboard eraser to solve the above problem. Summary of the Invention

[0003] The purpose of the invention is to provide a dust-free blackboard eraser with a flippable surface, which can flip the sponge body after wiping into a shell and automatically beat and collect chalk dust during the wiping process.

[0004] To achieve the above objectives, the technical solution provided by the present invention is:

[0005] A flip-up dust-free blackboard eraser comprises a shell with an opening at the bottom, a flip-up sponge assembly is installed at the bottom of the shell, a slapping assembly that cooperates with the sponge assembly is rotatably connected between the side walls of the inner cavity of the shell, a dust collection assembly is installed on the top of the shell, and the dust collection assembly is communicated with the top of the shell, mounting grooves are symmetrically provided on the opposite side walls of the shell, a roller with a concave cross-section is rotatably connected between the inner walls of the mounting grooves, and the bottom of the roller is higher than the bottom of the sponge assembly, a driving gear is provided on the bottom of the groove of the roller, a first driven gear that meshes with the driving gear is rotatably connected between the inner walls of the mounting grooves, a transmission shaft of the first driven gear is connected to the slapping assembly, and when the blackboard eraser is in use, the roller drives the slapping assembly to slap and dust the upper surface of the sponge assembly, and at the same time the dust collection assembly sucks chalk dust in the shell into the dust collection assembly.

[0006] Preferably, the sponge assembly includes a T-shaped mounting block slidably connected to the opposite side walls of the inner cavity of the shell, a fixed block is rotatably connected between the two T-shaped mounting blocks, sponge bodies are respectively installed on the top and bottom of the fixed block, and the opposite side walls of the inner cavity of the shell are provided with sliding grooves that cooperate with the T-shaped mounting blocks, and the outer wall of the fixed block is provided with a rubber ring that cooperates with the inner wall of the bottom opening of the shell.

[0007] Preferably, the fixing block is a structure that is hollow inside and penetrates from top to bottom, a partition is installed between the two opposite side walls of the fixing block, a mounting plate is symmetrically installed on the side where the two sponges are close to each other, and a first spring is connected between the mounting plate and the partition.

[0008] Preferably, two limiting protrusions are provided on a side of the mounting plate close to the partition, and elastic limiting members cooperating with the limiting protrusions are respectively provided on the upper and lower sides of the partition, and the two ends of the elastic limiting members respectively pass through the opposite side walls of the fixing block;

[0009] The elastic limiting member includes two L-shaped abutment blocks that are slidably connected to the partition, and the two L-shaped abutment blocks are away from each other and pass through the opposite side walls of the fixed block respectively. A second spring is connected between the ends of the two L-shaped abutment blocks that are close to each other. When the elastic limiting member is separated from the inner wall of the outer shell, the tops of the ends of the two L-shaped abutment blocks that are close to each other respectively abut against the bottoms of the two limiting protrusions.

[0010] Preferably, two positioning members are connected between the side surfaces of the two mounting plates that are close to each other, and the two positioning members are symmetrically arranged at both ends of the partition, the positioning members include positioning sleeves, the positioning sleeves are symmetrically and slidingly connected with positioning columns at both ends, and the ends of the two positioning columns that are away from each other are respectively connected to the two mounting plates, a support column is slidingly arranged inside the positioning sleeve, and an openable block structure is provided on the side wall of the positioning sleeve, when the rubber ring is separated from the inner wall of the fixed block, the block structure is opened to enable the support column to roll, and when the rubber ring abuts against the inner wall of the fixed block, the block structure is closed and abuts against the top of the support column.

[0011] Preferably, the block structure includes a fixed seat which is installed on the outer wall of the positioning sleeve and is hollow inside. Two blocks that can be inserted into the positioning sleeve are symmetrically and slidably connected to the opposite side walls of the inner cavity of the fixing seat, and the opposite sides of the top of the support column and the side where the two blocks are close to each other are provided with mutually matching inclined surfaces. The ends of the two blocks that are away from each other are respectively connected to positioning rods, one end of the positioning rod passes through the side wall of the fixing block and is located in the rubber ring, a positioning block is provided on the outer wall of the positioning rod, a third spring is sleeved on the outer wall of the positioning rod, and the third spring is located between the positioning block and the fixed seat.

[0012] Preferably, the beating assembly includes a rotating rod, which is connected to the transmission shaft of the first driven gear, and the outer wall of the rotating rod is provided with a cam for beating the sponge assembly.

[0013] Preferably, there are several cams, and the phase angles between the cams are different.

[0014] Preferably, the dust collection assembly includes a dust collection shell, and baffles with filter holes are symmetrically arranged on the inner walls of the opposite sides of the dust collection shell, and two dust collection chambers are formed between the two baffles and the two ends of the dust collection shell, and a dust storage chamber is formed between the two baffles. The dust storage chamber is connected to the outer shell, and a dust collection fan is arranged in the dust collection chamber. The outer wall of the drive shaft of the dust collection fan is provided with a second driven gear meshing with the first driven gear, and the drive shaft of the dust collection fan is rotatably connected to the side wall of the dust storage chamber through a one-way bearing, and a plurality of exhaust holes are provided on the top of the dust collection chamber.

[0015] Preferably, the top of the outer shell is connected to a plurality of dust exhaust pipes, and the dust collection shell is provided with through holes that cooperate with the dust exhaust pipes.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention can turn the used side of the blackboard eraser into the shell after it has been used for a period of time, and then, during the wiping process of the other side, the roller can synchronously drive the flapping component to work, thereby flapping and cleaning the side inside the shell, and at the same time, the dust collection component collects the chalk dust generated by flapping, thereby realizing dust-free cleaning of the blackboard eraser without causing environmental pollution, and the two sides of the blackboard eraser can be switched for wiping, and the other side can be cleaned synchronously during the wiping process of one side, thereby improving the wiping and cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of a blackboard eraser of the present invention;

[0020] Figure 2 It is a schematic diagram of the front cross-section structure of the blackboard eraser of the present invention;

[0021] Figure 3 Schematic diagram of the structure of the beating assembly in the blackboard eraser of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the sponge assembly in the blackboard eraser of the present invention;

[0023] Figure 5 Schematic side cross-sectional view of the sponge assembly in the blackboard eraser of the present invention in the first embodiment;

[0024] Figure 6Schematic diagram of the front cross-section structure of the sponge component in the blackboard eraser of the present invention in the first embodiment;

[0025] Figure 7 Schematic side cross-sectional view of the sponge assembly in the blackboard eraser of the present invention in the second embodiment;

[0026] Figure 8 Schematic diagram of the front cross-section structure of the sponge assembly in the blackboard eraser of the present invention in the second embodiment;

[0027] Figure 9 for Figure 8 A magnified schematic diagram of the structure at point A in the middle.

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0029] 1. Outer shell; 11. Dust exhaust pipe; 2. Sponge assembly; 21. T-shaped mounting block; 22. Fixed block; 23. Sponge body; 24. Rubber ring; 25. Partition; 26. Mounting plate; 27. First spring; 28. Limiting protrusion; 29. ​​Elastic limiting member; 291. L-shaped abutment block; 292. Second spring; 210. Positioning sleeve; 211. Positioning column; 212. Support column; 213. Block structure; 2131. Fixed seat; 2132. Block; 2133. Positioning rod; 2134. Positioning block; 2135. Third spring; 3. Beating assembly; 31. Rotating rod; 32. Cam; 4. Dust suction assembly; 41. Dust suction shell; 42. Baffle; 43. Dust suction fan; 44. Second driven gear; 5. Mounting slot; 6. Roller; 7. Driving gear; 8. First driven gear. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] like Figure 1-6 As shown: Embodiment 1 of the present invention is:

[0032] A flip-up dust-free blackboard eraser comprises a shell 1 with an opening at the bottom, a flip-up sponge assembly 2 is installed at the bottom of the shell 1, a slapping assembly 3 that cooperates with the sponge assembly 2 is rotatably connected between the side walls of the inner cavity of the shell 1, a dust collection assembly 4 is installed on the top of the shell 1, and the dust collection assembly 4 is communicated with the top of the shell 1, and mounting grooves 5 are symmetrically provided on the opposite side walls of the shell 1, a roller 6 with a concave cross-section is rotatably connected between the inner walls of the mounting grooves 5, and the bottom of the roller 6 is higher than the bottom of the sponge assembly 2, a driving gear 7 is provided on the bottom of the groove of the roller 6, a first driven gear 8 that meshes with the driving gear 7 is rotatably connected between the inner walls of the mounting grooves 5, and a transmission shaft of the first driven gear 8 is connected to the slapping assembly 3. When the blackboard eraser is in use, the roller 6 drives the slapping assembly 3 to slap and dust the upper surface of the sponge assembly 2, and at the same time, the dust collection assembly 4 sucks the chalk dust in the shell 1 into the dust collection assembly 4.

[0033] In this embodiment, the sponge assembly 2 includes a T-shaped mounting block 21 that is slidably connected to the opposite side walls of the inner cavity of the shell 1, and a fixed block 22 is rotatably connected between the two T-shaped mounting blocks 21. A sponge body 23 is respectively installed on the top and bottom of the fixed block 22. The opposite side walls of the inner cavity of the shell 1 are provided with a sliding groove that cooperates with the T-shaped mounting block 21. The outer wall of the fixed block 22 is provided with a rubber ring 24 that cooperates with the inner wall of the bottom opening of the shell 1. The use of the T-shaped mounting block can play a limiting role so that the T-shaped mounting block will not be separated from the shell. The setting of the rubber ring can not only play a sealing role between the fixed block and the shell, but also play a fixing role on the fixed block through the contact between the rubber ring and the shell. In order to ensure the stability of the installation of the rubber ring, a fixing ring for installing the rubber ring is provided on the side wall of the fixed block, and the fixing ring is provided with a groove for installing the rubber ring.

[0034] In this embodiment, in order to improve the beating and cleaning effect of the sponge assembly, the fixed block 22 is a structure that is hollow inside and penetrates from top to bottom. A partition 25 is installed between the inner walls of the fixed block 22, and a mounting plate 26 is symmetrically installed on the side where the two sponges 23 are close to each other, and the opening positions at both ends of the fixed block 22 are provided with limiting parts that cooperate with the mounting plate 26 (to limit the mounting plate 26 to prevent the mounting plate 26 from separating from the fixed block 22). A first spring 27 is connected between the mounting plate 26 and the partition 25. The setting of the spring allows the sponge to vibrate more when the beating assembly beats the sponge, thereby improving the beating and cleaning effect.

[0035] In this embodiment, in order to prevent the sponge from sliding during wiping and causing uneven wiping, two limiting protrusions 28 are provided on one side of the mounting plate 26 close to the partition 25, and elastic limiting members 29 are respectively provided on the upper and lower sides of the partition 25 to cooperate with the limiting protrusions 28, and the two ends of the elastic limiting member 29 respectively pass through the opposite side walls of the fixing block 22. When the elastic limiting member 29 abuts against the inner wall of the shell 1, the elastic limiting member 29 is separated from the limiting protrusion 28, so that the partition 25 can slide up and down. The elastic limiting member 29 includes two L-shaped abutting blocks 291 that are slidably connected to the partition 25, and the two L-shaped abutting blocks 291 are respectively connected to the partition 25. The two L-shaped abutment blocks 291 are spaced apart from each other and pass through the opposite side walls of the fixed block 22 respectively. A second spring 292 is connected between the ends of the two L-shaped abutment blocks 291 that are close to each other. The tops of the ends of the two L-shaped abutment blocks 291 that are close to each other abut against the bottoms of the two limiting protrusions 28 respectively. After the sponge body is flipped over, the L-shaped abutment blocks below the shell are separated from the contact with the shell, so that the two L-shaped abutment blocks return to a normal state from the original compressed state, pushing the two L-shaped abutment blocks away from each other, and making the L-shaped abutment blocks gradually abut against the two limiting protrusions, so that the sponge body located below is in a fixed state and will not slide during the wiping process.

[0036] In this embodiment, the beating assembly 3 includes a rotating rod 31, which is connected to the transmission shaft of the first driven gear 8. The outer wall of the rotating rod 31 is provided with a cam 32 for beating the sponge assembly 2. When the roller rolls, the first driven gear can be driven to rotate through the driving gear, thereby driving the rotating rod and the cam to rotate to beat the sponge body.

[0037] In this embodiment, there are several cams 32, and the phase angles between each cam 32 are different. By setting multiple cams with different phase angles, the corpus cavernosum can produce different regular vibrations during tapping, thereby achieving a better tapping effect.

[0038] In this embodiment, in order to further utilize the kinetic energy generated by the rolling of the roller, the dust collection assembly 4 includes a dust collection shell 41, and baffles 42 with filter holes are symmetrically provided on the inner walls of the two opposite sides of the dust collection shell 41. Two dust collection chambers are formed between the two baffles 42 and the two ends of the dust collection shell 41. A dust storage chamber is formed between the two baffles 42. The dust storage chamber is connected to the shell 1. A dust collection fan 43 is provided in the dust collection chamber. The outer wall of the drive shaft of the dust collection fan 43 is provided with a second driven gear meshing with the first driven gear 8. 44, and the driving shaft of the dust collecting fan 43 is rotatably connected to the side wall of the dust storage chamber through a one-way bearing. A number of exhaust holes are opened on the top of the dust collection chamber. When the roller rolls, the second driven gear is driven to rotate by the driving gear and the first driven gear, thereby driving the dust collecting fan to rotate, so that the dust storage chamber of the dust collection shell generates negative pressure and the chalk dust generated by the beating in the shell is sucked into the dust storage chamber, thereby realizing the collection of chalk dust. In addition, the driving shaft of the dust collecting fan is rotatably connected with the one-way bearing so that the dust collecting fan can only rotate in the direction of generating negative pressure.

[0039] In this embodiment, in order to prevent chalk dust from falling back into the outer shell from the dust collection shell, a number of dust exhaust pipes 11 are connected to the top of the outer shell 1, and the dust collection shell 41 is provided with a through hole that cooperates with the dust exhaust pipe 11. Through the arrangement of the dust exhaust pipe, there is a distance between the end of the dust exhaust pipe and the bottom of the dust storage chamber, so that the chalk dust can be stored at a certain height and will not fall back into the outer shell, and the structure of the dust exhaust pipe is arranged to have a closed structure at the upper end, or the dust exhaust pipe is used in conjunction with a one-way valve.

[0040] In this embodiment, the dust collection shell 41 is detachably connected to the outer shell 1 through a snap fastener, and the dust collection shell and the outer shell can be disassembled and assembled by separating them up and down, so that chalk dust in the dust collection assembly can be cleaned.

[0041] The specific working process of this embodiment is as follows:

[0042] When using the blackboard eraser, the user wipes the blackboard eraser by holding the outer shell 1 or the dust collection shell 41 (and the outer walls of the outer shell 1 and the dust collection shell 41 are both provided with anti-slip grooves). After wiping for a while, the user pulls down the fixing block 22 to make the T-shaped mounting block 21 slide downward along the outer shell 1, and then flips the fixing block 22 to flip the upper and lower sponges 23, flips the wiped sponges 23 upward, and then pushes the fixing block 22 back into the outer shell 1 to insert the upper sponge 23 into the outer shell 1 until the rubber ring 24 is stuck in the outer shell 1, completing the fixation of the fixing block 22, and then holds the outer shell 1 again to wipe.

[0043] During the wiping process, the sponge 23 contacts the blackboard and applies a certain pressure to deform the sponge 23, so that the roller 6 also contacts the blackboard and then wipes it; the roller 6 rolls as the blackboard eraser wipes, driving the driving gear 7 to rotate, and the driving gear 7 drives the first driven gear 8 and the second driven gear 44 to rotate, and the first driven gear 8 drives the rotating rod 31 and the cam 32 to rotate, and the cam 32 beats the sponge 23 located above, so that the chalk dust attached to the sponge 23 flies up, and at the same time the second driven gear 44 drives the dust suction fan 43 to rotate, and the dust suction fan 43 forms a negative pressure in the dust storage chamber, thereby sucking the chalk dust generated by the beating into the dust storage chamber through the dust exhaust pipe 11 for collection, and when the blackboard eraser is not in use, the chalk dust is cleaned by separating the dust suction shell 41 from the shell 1.

[0044] When the sponge body 23 is flipped over and pushed back upward, the L-shaped abutment block 291 of the fixed block 22 located on the upper side wall gradually contacts the inner wall of the shell 1 (and the end of the L-shaped abutment block 291 is provided with an inclined slope), pushing the two L-shaped abutment blocks 291 to slide close to each other, compressing the second spring 292 and separating from the two limiting protrusions 28, so that the sponge body 23 and the mounting plate 26 located above can generate up and down shaking during the beating process, thereby improving the beating dust removal efficiency. Since the sponge body 23 located below loses external extrusion due to the L-shaped abutment block 291, the second spring 292 returns to push the two L-shaped abutment blocks 291 to slide away from each other, so that the L-shaped abutment block 291 again abuts against the limiting protrusion 28, so that the sponge body 23 located below can remain stable during use.

[0045] At the same time, the dust collection component 4 in this embodiment can adopt an electric dust collection structure, that is, a power supply, a motor and other structures are set in the dust collection shell 41 (which is the existing technology and will not be described in detail here), so that automatic dust collection can be achieved.

[0046] At the same time, the dust collection component 4 and the outer shell 1 in this embodiment can also be set as an integrated structure, and an openable cover is set on the side wall of the dust collection shell 41 to facilitate cleaning of the inside of the dust collection shell 41.

[0047] like Figure 1-4 , 7-9: Embodiment 2 of the present invention is:

[0048] The difference between this embodiment and the first embodiment is that:

[0049] In this embodiment, two positioning members are connected between the side surfaces of the two mounting plates 26 that are close to each other, and the two positioning members are symmetrically arranged at both ends of the partition 25. The positioning members include a positioning sleeve 210, and the positioning sleeve 210 is symmetrically slidably connected with positioning columns 211 at both ends, and the ends of the two positioning columns 211 that are away from each other are respectively connected to the two mounting plates 26. A support column 212 is slidably provided inside the positioning sleeve 210, and an openable stopper structure 213 is provided on the side wall of the positioning sleeve 210. When the rubber ring 24 is separated from the inner wall of the fixed block 22, the stopper structure 213 is opened to allow the support column 212 to roll. When the rubber ring 24 abuts the inner wall of the fixed block 22, the stopper structure 213 is closed and abuts against the top of the support column 212 The stopper structure 213 includes a fixed seat 2131 installed on the outer wall of the positioning sleeve 210 and hollow inside. The inner cavity of the fixed seat 2131 is symmetrically and slidably connected with two stops 2132 that can be inserted into the positioning sleeve 210 on the opposite side walls. The top of the support column 212 has opposite sides and a side surface where the two stops 2132 are close to each other. There are matched inclined surfaces, and the ends of the two stops 2132 away from each other are respectively connected to a positioning rod 2133. One end of the positioning rod 2133 passes through the side wall of the fixing block 22 and is located in the rubber ring 24. A positioning block 2134 is provided on the outer wall of the positioning rod 2133. A third spring 2135 is sleeved on the outer wall of the positioning rod 2133, and the third spring 2135 is located between the positioning block 2134 and the fixed seat 2131.

[0050] The specific working process of the above embodiment is as follows:

[0051] When the user pulls the fixing block 22 downward, the rubber ring 24 is separated from the contact with the inner wall of the fixing block 22, so that the rubber ring 24 recovers from the squeezed deformation state, and the positioning rod 2133 returns to its original position under the action of the third spring 2135, so that the two stoppers 2132 are opened, and then the fixing block 22 is flipped over. At this time, the support column 212 at the bottom can slide downward along the positioning sleeve 210 and abut against the positioning column 211 at the bottom (that is, the support column 212 can always remain at the bottom), and then the fixing block 22 is pushed upward, so that the rubber ring 24 abuts against the inner wall of the fixing block 22 again and deforms, pushing the positioning rod 2133 to slide, and the positioning rod 2133 The push block 2132 is pushed to slide and block the positioning sleeve 210 and abut against the top of the support column 212. During the sliding process, the stop block 2132 contacts the top of the support column 212 through the inclined surface and pushes the support column 212 and the mounting plate 26 down and into place as it continues to slide, so that the positioning column 211, support column 212 and stop block 2132 below can directly form a stable support structure, so that the mounting plate 26 located below can remain fixed during the wiping process, and the mounting plate 26 located above can slide up and down along the positioning sleeve 210 because the upper positioning column 211 loses the support of the support column 212, so that the upper mounting plate 26 can shake when tapping.

[0052] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dust-free blackboard eraser with a reversible surface, characterized by: The invention comprises a shell (1) with an opening at the bottom, a reversible sponge assembly (2) being installed at the bottom of the shell (1), a flapping assembly (3) cooperating with the sponge assembly (2) being rotatably connected between the side walls of the inner cavity of the shell (1), a dust collection assembly (4) being installed at the top of the shell (1), and the dust collection assembly (4) being connected to the top of the shell (1), mounting grooves (5) being symmetrically opened on opposite side walls of the shell (1), a roller (6) with a concave cross section being rotatably connected between the inner walls of the mounting groove (5), and the bottom of the roller (6) being rotatably connected to the inner wall of the roller (6). The bottom of the roller (6) is higher than the bottom of the sponge assembly (2), the groove bottom sleeve of the roller (6) is provided with a driving gear (7), the inner wall of the mounting groove (5) is rotatably connected with a first driven gear (8) that meshes with the driving gear (7), the transmission shaft of the first driven gear (8) is connected to the beating assembly (3), when the blackboard eraser is in use, the roller (6) drives the beating assembly (3) to beat the upper surface of the sponge assembly (2) to remove dust, and at the same time, the dust collection assembly (4) sucks the chalk dust in the shell (1) into the dust collection assembly (4); The sponge assembly (2) includes a T-shaped mounting block (21) that is slidably connected to the opposite side walls of the inner cavity of the shell (1), a fixed block (22) is rotatably connected between the two T-shaped mounting blocks (21), and a sponge body (23) is respectively installed on the top and bottom of the fixed block (22), and the opposite side walls of the inner cavity of the shell (1) are provided with a sliding groove that cooperates with the T-shaped mounting block (21), and the outer wall of the fixed block (22) is provided with a rubber ring (24) that cooperates with the inner wall of the bottom opening of the shell (1), and the fixed block (22) is a structure that is hollow inside and through from top to bottom, and a partition (25) is installed between the opposite side walls of the fixed block (22), and a mounting plate (26) is symmetrically installed on the side where the two sponges (23) are close to each other, and a first spring (27) is connected between the mounting plate (26) and the partition (25); Two limiting protrusions (28) are provided on one side of the mounting plate (26) close to the partition (25), and elastic limiting members (29) that cooperate with the limiting protrusions (28) are respectively provided on the upper and lower sides of the partition (25), and the two ends of the elastic limiting member (29) respectively pass through the opposite side walls of the fixing block (22); The elastic limiting member (29) includes two L-shaped abutting blocks (291) slidably connected to the partition (25), and the two L-shaped abutting blocks (291) are separated from each other and pass through the opposite side walls of the fixed block (22). A second spring (292) is connected between the ends of the two L-shaped abutting blocks (291) that are close to each other. When the elastic limiting member (29) is separated from the inner wall of the shell (1), the tops of the ends of the two L-shaped abutting blocks (291) that are close to each other abut against the bottoms of the two limiting protrusions (28).

2. The flip-over dust-free blackboard eraser according to claim 1, characterized in that: The beating assembly (3) comprises a rotating rod (31), the rotating rod (31) being connected to the transmission shaft of the first driven gear (8), and a cam (32) for beating the sponge assembly (2) is provided on the outer wall of the rotating rod (31).

3. The flip-over dust-free blackboard eraser according to claim 2, characterized in that: A plurality of cams (32) are provided, and the phase angles between the cams (32) are different.

4. The flip-over dust-free blackboard eraser according to claim 1, characterized in that: The dust collection assembly (4) comprises a dust collection shell (41), baffles (42) with filter holes are symmetrically arranged on the inner walls of opposite sides of the dust collection shell (41), and two dust collection chambers are formed between the two baffles (42) and the two ends of the dust collection shell (41), and a dust storage chamber is formed between the two baffles (42), and the dust storage chamber is communicated with the outer shell (1). A dust collection fan (43) is arranged in the dust collection chamber, and the outer wall of the driving shaft of the dust collection fan (43) is provided with a second driven gear (44) meshing with the first driven gear (8), and the driving shaft of the dust collection fan (43) is rotatably connected to the side wall of the dust storage chamber through a one-way bearing, and a plurality of exhaust holes are opened on the top of the dust collection chamber.

5. The flip-over dust-free blackboard eraser according to claim 4, characterized in that: The top of the outer shell (1) is connected to a plurality of dust exhaust pipes (11), and the dust collection shell (41) is provided with through holes that cooperate with the dust exhaust pipes (11).

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