CN112172384A - From plug-type blackboard about taking blackboard eraser - Google Patents
From plug-type blackboard about taking blackboard eraser Download PDFInfo
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- CN112172384A CN112172384A CN202011130890.XA CN202011130890A CN112172384A CN 112172384 A CN112172384 A CN 112172384A CN 202011130890 A CN202011130890 A CN 202011130890A CN 112172384 A CN112172384 A CN 112172384A
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- Prior art keywords
- blackboard
- eraser
- blackboard eraser
- outer frame
- inner core
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
- B43L1/04—Blackboards
- B43L1/045—Blackboards with magnetic action
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L21/00—Blackboard or slate cleaning devices
- B43L21/02—Blackboard or slate cleaning devices with means for absorbing the chalk dust
Abstract
The invention discloses an up-down push-pull type blackboard with a blackboard eraser, wherein the upper blackboard and the lower blackboard are arranged in a front-back staggered manner through a built-in track and are connected with a blackboard outer frame in a vertical sliding manner through an elastic device, the upper blackboard eraser and the lower blackboard eraser can be respectively rotatably cross-mounted on the blackboard outer frame, the upper blackboard eraser is arranged on the front side of the upper blackboard, the lower blackboard eraser is arranged between the upper blackboard eraser and the lower blackboard eraser, and the upper blackboard eraser and the lower blackboard eraser both comprise an arc-shaped outer convex. The blackboard eraser is simple in structure, the upper blackboard and the lower blackboard are respectively arranged in the front rail and the rear rail which are distributed front and back, the two ends of the upper blackboard and the lower blackboard are respectively fixed on the outer frame of the blackboard through the magnetic attraction and the spring, the push-and-pull operation is labor-saving, any blackboard clamping phenomenon is not easy to occur, the upper blackboard eraser and the lower blackboard eraser respectively comprise an arc-shaped outer convex surface and a vertical plane, the arc-shaped outer convex surface or the vertical plane of the blackboard eraser is adjusted to face the blackboard, the blackboard can be moved by pushing and pulling the blackboard, blackboard writing on the blackboard can be erased or kept, the positions of the upper.
Description
Technical Field
The invention belongs to the technical field of teaching aids, and particularly relates to an up-and-down push-pull type blackboard with a blackboard eraser.
Background
At present, a traditional blackboard pushed up and down is widely used in the university of middle school, but generally has the phenomena of larger and heavier blackboard and more dust, and is very unfriendly to teachers or students who clean the blackboard. For the technical problems, sliding type or push-pull type blackboard erasers appear in the market and are used for erasing characters on an upper push-pull type blackboard and a lower push-pull type blackboard, but the push-pull sliding of the blackboard erasers is independent from the push-pull movement of the upper blackboard and the lower blackboard, so that the purpose of erasing the characters while pushing and pulling the blackboard cannot be realized, and time and labor are wasted during use; in addition, a large force is required to push and pull the blackboard up and down, and as the service life of the blackboard is prolonged, a certain half of the blackboard is inclined and clamped and cannot be normally used.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides an up-down push-pull blackboard with a blackboard eraser, which comprises a D-shaped blackboard eraser, wherein the arc-shaped outer convex surface or the vertical plane of the D-shaped blackboard eraser is adjusted to face the blackboard, and characters on the blackboard can be erased or retained by pushing and pulling the blackboard, so that only the up-down blackboard and the blackboard can be changed.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows: the upper blackboard eraser and the lower blackboard eraser are rotatably and transversely arranged on the blackboard frame through a built-in rail in a staggered mode and are vertically and slidably connected with the blackboard frame through elastic devices, the upper blackboard eraser and the lower blackboard eraser are respectively arranged on the front side of the upper blackboard, the lower blackboard eraser is arranged between the upper blackboard and the lower blackboard, the upper blackboard eraser and the lower blackboard eraser respectively comprise an arc-shaped outer convex surface and a vertical plane, the upper blackboard eraser is in sliding contact with the upper blackboard through the arc-shaped outer convex surface and is isolated from the upper blackboard through the vertical plane, and the lower blackboard eraser is in sliding contact with the lower blackboard through the arc-shaped outer convex surface and is isolated from the lower blackboard through the vertical plane.
Further, the inner sides of the left frame plate and the right frame plate of the blackboard outer frame are respectively provided with a front rail and a rear rail, the front rail is symmetrically and concavely arranged at the front ends of the inner side surfaces of the left frame plate and the right frame plate of the blackboard outer frame, the rear rail is symmetrically and concavely arranged at the rear ends of the inner side surfaces of the left frame plate and the right frame plate of the blackboard outer frame, the upper blackboard and the lower blackboard are respectively embedded into the front rail and the rear rail, the bottom of the upper blackboard is connected with the lower frame plate of the blackboard outer frame through a spring, and the top of the lower blackboard is connected with the upper frame.
Furthermore, the tops and the bottoms of the upper blackboard and the lower blackboard are provided with magnet strips, the inner sides of the upper frame plate and the lower frame plate of the blackboard outer frame are provided with ferromagnetic blocks, the top of the upper blackboard is fixed on the inner side of the upper frame plate of the blackboard outer frame through magnetic adsorption, a spring connected with the bottom of the upper blackboard is in a stretching state, the bottom of the lower blackboard is fixed on the inner side of the lower frame plate of the blackboard outer frame through magnetic adsorption, and the spring connected with the top of the lower blackboard is in a stretching state; magnet strip height is not less than the spring height after the complete compression, go up the blackboard and pass through bottom magnet strip and the inboard ferromagnetic path magnetism of the lower deckle board of blackboard frame and adsorb fixedly (compression spring's resilience force is less than the resultant force of blackboard bottom magnetism adsorption effort rather than self gravity) and exchange position to below, it is in compression state to go up blackboard bottom spring this moment, the blackboard passes through top magnet strip and the inboard ferromagnetic path magnetism of the last deckle board of blackboard frame and adsorbs fixedly and exchange position to the top down, and the spring that blackboard top was connected is in compression state down this moment.
Further, the upper blackboard eraser and the lower blackboard eraser are identical in structure and respectively comprise a wiping sponge sleeve and a blackboard eraser inner core, the longitudinal section of the wiping sponge sleeve is D-shaped, and the wiping sponge sleeve is sleeved outside the blackboard eraser inner core and is fixed on a blackboard outer frame through the blackboard eraser inner core.
Further, the blackboard eraser inner core includes inner core cotton and threaded rod, it establishes in the cotton outside of inner core to clean the sponge cover, the inner core cotton is the same with the sponge cover length of cleaning and the longitudinal section is the D style of calligraphy, the cotton cover of inner core is established on the threaded rod, and the equipartition has inner core hole on the cotton arcwall face of inner core.
Furthermore, the top of the upper blackboard and the lower blackboard are both magnetic blackboards, a soft iron sheet is wrapped between the arc-shaped portions of the wiping sponge sleeve and the inner core cotton to ensure that the upper blackboard eraser and the lower blackboard eraser can be respectively tightly attached to the upper blackboard and the lower blackboard, a certain wiping effect is achieved, the plane side of the wiping sponge sleeve is wrapped with a plastic shell, the design can ensure that when the plane side of the wiping sponge sleeve turns to the blackboard, a gap exists between the blackboard eraser and the blackboard, and therefore when the blackboard is pushed and pulled up and down, the blackboard eraser cannot contact the blackboard to keep the effect of chalk writing.
Furthermore, the up-down push-pull type blackboard with the blackboard eraser further comprises a dust collection device and a filter device, the filter device is fixed on the upper portion of the dust collection device, air flow inside the filter device is communicated, and the dust collection device is communicated with inner core cotton of the upper blackboard eraser through a pressurizing device.
Further, the lower blackboard eraser is connected to the blackboard outer frame through a threaded rod in a threaded mode, the upper blackboard eraser is connected to the buckle through a threaded rod in a threaded mode, and the buckle is symmetrically fixed to the left side and the right side of the blackboard outer frame through screws.
Further, dust extraction includes vane motor, dust absorption shell and dust absorption pipeline, vane motor passes through bearing eccentric mounting in the dust absorption shell, the dust absorption pipeline is fixed in dust absorption shell bottom and is linked together with the dust absorption shell is inside, dust absorption pipeline intercommunication supercharging device, supercharging device is the square shell of opening the pressure boost pipeline, inserts through the pressure boost pipeline and inlays and connect the pressure boost pipeline hole, the pressure boost pipeline hole is transversely seted up in the cotton left and right ends of inner core, pressure boost pipeline internal diameter and inner core hole aperture all far are less than the dust absorption pipeline internal diameter, and the pressure boost pipeline that obtains inner core cotton department according to hydromechanics knowledge has great effort that attracts the chalk dirt to this plays pressure boost dust absorption effect.
Furthermore, filter equipment filters the shell including filtering sponge and no end, filter the sponge interference and install in no end filters the shell, and no end filters the shell top equipartition and has the ventilation hole, the through-hole has been seted up at dust absorption shell top, no end filters the shell and fixes on the dust absorption shell and the through-hole is linked together with the dust absorption shell through the pin.
Compared with the prior art, the invention has the following beneficial effects:
1) the up-down push-pull blackboard with the blackboard eraser provided by the invention has a simple structure, the up-down blackboard is arranged in built-in rails distributed in the front and back, and two ends of the up-down blackboard are respectively fixed on a blackboard outer frame through a magnetic attraction and a spring, the operation of pushing and pulling the up-down blackboard is labor-saving, the up-down blackboard and the up-down blackboard can be simultaneously arranged at the upper position or the lower position or staggered and distributed up and down on different movement rails, the phenomenon that one blackboard is stuck due to the traditional push-pull blackboard is not easy to occur after;
2) the blackboard eraser is arranged on the front side of an upper blackboard, the lower blackboard eraser is arranged in the middle of the upper blackboard and the lower blackboard, the upper blackboard eraser and the lower blackboard eraser both comprise an arc-shaped outer convex surface and a vertical plane, the blackboard is pushed and pulled up and down, and the blackboard is erased by adjusting the position of the upper blackboard and the lower blackboard when the arc-shaped outer convex surface of the blackboard eraser faces the blackboard; on the basis, the supercharging device, the dust suction device and the filtering device are additionally arranged, so that the dust suction device can suck and remove chalk dust which is harmful to human bodies and is diffused in the air, and the filtering device can keep the chalk dust on the filtering sponge, thereby maintaining good external working or learning environment; the blackboard eraser has the advantages that the vertical plane of the blackboard eraser is adjusted to face the blackboard, the upper blackboard and the lower blackboard are pushed and pulled, the positions of the upper blackboard and the lower blackboard are only changed, blackboard writing cannot be erased, operation is convenient, and functions are various;
3) the filter device is detachable, so that the chalk dust can be filtered, and the filter sponge can be replaced conveniently in time to keep a good filtering effect.
Drawings
FIG. 1 is a schematic structural view of a push-pull type blackboard with a blackboard eraser according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of the blackboard outer frame structure of FIG. 1;
FIG. 3 is a schematic view of the upper blackboard structure of FIG. 1;
FIG. 4 is a schematic view of the upper blackboard eraser structure of FIG. 3;
fig. 5 is a schematic view of the structure of the blackboard eraser core of fig. 4;
FIG. 6 is a schematic view of a push-pull type blackboard with a blackboard eraser
Figure 7 is a fragmentary view of the suction device and filter arrangement of figure 6.
Wherein the reference numerals are: the blackboard eraser comprises a blackboard outer frame 1, a front rail 1-1, a rear rail 1-2, an upper blackboard 2, a lower blackboard 3, an upper blackboard eraser 4, a lower blackboard eraser 5, a spring 6, a magnet strip 7, an iron magnet block 8, a wiping sponge sleeve 9-1, a blackboard eraser inner core 9-2, inner core cotton 9-21, an inner core hole 9-211, a pressurizing pipeline hole 9-212, a threaded rod 9-22, a dust suction device 10, a vane motor 10-1, a dust suction outer shell 10-2, a through hole 10-21, a dust suction pipeline 10-3, a filtering device 11, a filtering sponge 11-1, a bottomless filtering shell 11-2, a vent hole 11-21, a pressurizing device 12, a buckle 13 and a screw 14.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Example 1
As shown in figures 1-3, the invention relates to an up-down push-pull blackboard with a blackboard eraser, which comprises a blackboard outer frame 1, an upper blackboard 2, a lower blackboard 3, an upper blackboard eraser 4 and a lower blackboard eraser 5, wherein the inner sides of a left frame plate and a right frame plate of the blackboard outer frame 1 are respectively provided with a front rail 1-1 and a rear rail 1-2, the front rails 1-1 are symmetrically and concavely arranged at the front ends of the inner side surfaces of the left frame plate and the right frame plate of the blackboard outer frame 1, the rear rails 1-2 are symmetrically and concavely arranged at the rear ends of the inner side surfaces of the left frame plate and the right frame plate of the blackboard outer frame 1, the upper blackboard 2 and the lower blackboard 3 are respectively embedded in the front rails 1-1 and the rear rails 1-2 and are added with lubricating oil to provide fluid friction, the bottom of the upper blackboard 2 is connected with the lower frame plate of the blackboard outer frame 1 through a spring 6, the top of the lower blackboard, the inner sides of an upper frame plate and a lower frame plate of a blackboard outer frame 1 are both provided with ferromagnetic blocks 8, the ferromagnetic blocks 8 are made of carbon steel, the top of the upper blackboard 2 is fixed at the inner side of the upper frame plate of the blackboard outer frame 1 through magnetic adsorption, at the moment, a spring 6 connected with the bottom of the upper blackboard 2 is in a stretching state, the bottom of the lower blackboard 3 is fixed at the inner side of the lower frame plate of the blackboard outer frame 1 through magnetic adsorption, at the moment, the spring 6 connected with the bottom of the lower blackboard is in a stretching state, the height of a magnet strip 7 is not lower than the height of the spring 6 after the spring 6 is completely compressed, so as to ensure that the magnet strip 7 can be contacted with the magnet blocks 8 at the inner sides of the upper frame plate and the lower frame plate of the blackboard outer frame 1 and is fixed through magnetic adsorption when the upper blackboard 2 is arranged below, the spring 6 connected with the bottom of the upper blackboard 2 is, the top of the blackboard eraser is fixed on the inner side of an upper frame plate of a blackboard outer frame 1 through magnetic adsorption, at the moment, a spring 6 connected with the top of a lower blackboard 3 is in a compression state, an upper blackboard eraser 4 and a lower blackboard eraser 5 can be respectively and rotatably erected on the blackboard outer frame 1, the upper blackboard eraser 4 is arranged on the front side of the upper blackboard 2, the lower blackboard eraser 5 is arranged between the upper blackboard 2 and the lower blackboard 3, the upper blackboard eraser 4 and the lower blackboard eraser 5 are identical in structure and respectively comprise an arc-shaped outer convex surface and a vertical plane, the upper blackboard eraser 4 is in sliding contact with the upper blackboard 2 through the arc-shaped outer convex surface and is isolated from the upper blackboard 2 through the vertical plane, and the lower blackboard eraser 5 is in sliding contact with the lower blackboard 3 through the arc.
As shown in figures 4 and 5, the upper blackboard eraser 2 and the lower blackboard eraser 3 have the same structure and both comprise a wiping sponge sleeve 9-1 and a blackboard eraser inner core 9-2, the longitudinal section of the wiping sponge sleeve 9-1 is D-shaped, the blackboard eraser inner core 9-2 comprises inner core cotton 9-21 and a threaded rod 9-22, the wiping sponge sleeve 9-1 is sleeved outside the inner core cotton 9-21, the inner core cotton 9-21 and the wiping sponge sleeve 9-1 have the same length and the longitudinal section is D-shaped, the inner core cotton 9-21 is sleeved on the threaded rod 9-22, inner core holes 9-211 are uniformly distributed on the arc surface of the inner core cotton 9-21, the threaded rod 9-22 is a cylindrical rod with external thread sections at two ends, the lower blackboard eraser 3 is connected on the outer frame 1 through the threaded rod 9-22, the upper blackboard eraser 2 is connected on the blackboard 13 through the threaded rod 9-22, the buckles 13 are symmetrically fixed on the left and right sides of the blackboard outer frame 1 through screws 14.
Further, the threaded rods 9-22 can be formed by sleeving the inner cylindrical rod and the outer cylindrical rod, so that when the lower blackboard eraser 3 needs to replace the wiping sponge sleeve 9-1, the threaded rods 9-22 can be detached from the blackboard outer frame 1 by screwing the inner cylindrical rod into the outer cylindrical rod, and then the wiping sponge sleeve 9-1 is replaced and the lower blackboard eraser 3 is installed on the blackboard outer frame 1 again.
The upper blackboard 2 and the lower blackboard 3 are both magnetic blackboards, soft iron sheets are wrapped between the arc-shaped parts of the wiping sponge sleeve 9-1 and the inner core cotton 9-21 to ensure that the upper blackboard eraser and the lower blackboard eraser can be respectively tightly attached to the upper blackboard eraser and the lower blackboard eraser to achieve a certain erasing effect, and the plane side of the wiping sponge sleeve 9-1 is wrapped with a plastic shell.
When a user wants to erase a blackboard writing on the upper blackboard 2, the arc-shaped convex surface of the upper blackboard eraser 4 is rotationally adjusted to face the upper blackboard 2, the upper blackboard 2 is lightly pressed to be pulled down, the upper blackboard 2 is driven to move through friction force between fingers and the blackboard, when the magnetic force between the magnet strip 7 above the upper blackboard 2 and the iron magnet block 8 on the inner side of the upper frame plate of the blackboard outer frame 1 is smaller than the resultant force of the friction force and the pulling force of the lower spring 6, the upper blackboard 2 directly slides down along the front rail 1-1 by the blackboard outer frame 1, meanwhile, the erasing sponge sleeve 9-1 on the upper blackboard eraser 4 is in close contact with the upper blackboard 2 through the wrapped soft iron sheet, the erasing sponge sleeve 9-1 erases the blackboard writing on the upper blackboard eraser, and the lower blackboard eraser 5 erases the lower blackboard.
When the upper and lower positions of the upper blackboard 2 and the lower blackboard 3 only need to be adjusted, the plastic shell on the plane side of the upper blackboard eraser 4 is rotationally adjusted to face the upper blackboard 2, then the upper blackboard 2 is pulled down, the upper blackboard 2 is fixed on the inner side of the lower frame plate of the blackboard outer frame 1 through bottom magnetic adsorption so as to be changed to the lower side, the upper blackboard 2 does not contact with the surface of the upper blackboard eraser 4 when moving, and therefore the purpose that the upper and lower positions of the upper blackboard 2 are only changed without erasing blackboard writing is achieved, and the lower blackboard eraser 3 operates on the lower blackboard in the same way.
Example 2
As shown in fig. 4 to 7, the difference between this embodiment and embodiment 1 is that the up-down push-pull blackboard with a blackboard eraser further includes a dust collection device 10, a filter device 11 and a pressure boosting device 12, the lower blackboard eraser 3 is connected to the blackboard outer frame 1 through a threaded rod 9-22, the upper blackboard eraser 2 is connected to a buckle 13 through a threaded rod 9-22, the buckle 13 is symmetrically fixed on the left and right sides of the blackboard outer frame 1 through a screw 14, the dust collection device 10 and the filter device 11 are fixed on the two side walls of the blackboard outer frame 1 through screws, the dust collection device 10 includes a vane motor 10-1, a dust collection housing 10-2 and a dust collection pipe 10-3, the top of the dust collection housing 10-2 is provided with a through hole 10-21, the vane motor 10-1 is eccentrically installed in the dust collection housing 10-2 through a bearing, the dust collection pipe 10-3 is fixed at the bottom of the, the dust collection pipeline 10-3 is communicated with the supercharging device 12, the supercharging pipeline holes 9-212 are transversely arranged at the left end and the right end of the inner core cotton 9-21, the supercharging device 12 is connected with the supercharging pipeline holes 9-212 of the upper blackboard eraser 4 in an inserted and embedded mode through the supercharging pipeline, the inner diameter of the supercharging pipeline and the hole diameter of the inner core holes 9-211 are smaller than the inner diameter of the dust collection pipeline 10-3, the filtering device 11 comprises a filtering sponge 11-1 and a bottomless filtering shell 11-2, the bottomless filtering shell 11-2 is fixed on the dust collection shell 10-2 through pins, the through holes 10-21 are communicated with the air flow inside the dust collection device 10, the filtering sponge 11-1 is installed in the bottomless filtering shell 11-2 in an interference mode, and the ventilation holes 11-21 are evenly.
Taking the motion process of the blackboard 2 as an example, the initial state is that the upper blackboard 2 is closely adsorbed together with the ferromagnetic blocks 8 through the magnet bars 7 so that the upper blackboard 2 is stopped at the upper half part, and the springs 6 at the left side and the right side of the lower end of the upper blackboard are tensioned so that the upper blackboard 2 bears downward tension; when the blackboard writing on the upper blackboard 2 needs to be erased, the arc-shaped outer convex surface of the upper blackboard eraser 4 is rotationally adjusted to face the upper blackboard 2, the resultant force of the friction force between the finger (palm) and the upper blackboard 2 and the tension of the spring 6 is larger than the magnetic adsorption force to move downwards, the upper blackboard eraser 4 sweeps the upper blackboard 2 in the moving process, and sweeps chalk characters on the upper blackboard 2 through the arc-shaped convex surface, when the dust on the upper blackboard is too large, the dust suction device 10 is opened, the built-in vane motor 10-1 rotates to generate an air flow from bottom to top, since the pressurizing duct and the core hole 9-211 are smaller in size than the dust suction duct 10-3, according to a pressure formula, the inner core holes 9-211 of the upper blackboard eraser 4 can generate higher pressure, the effect of absorbing chalk dust is better, and dust absorbed into the dust absorption device 10 is further upwards filtered by the filtering sponge 11-1 of the filtering device 11 and then is discharged to the outside through the vent holes 11-21; the movement process of the lower blackboard is the same.
When the position of the upper blackboard and the lower blackboard only needs to be changed, the plastic shell on the plane side of the upper blackboard eraser 4 is rotationally adjusted to face the upper blackboard 2, so that the blackboard eraser is not contacted with the surface of the blackboard, and then the upper blackboard 2 is pulled downwards or the lower blackboard 3 is pushed upwards.
Example 3
The difference between the embodiment and the embodiment 2 is that two pressurizing pipelines are arranged at the bottom of the pressurizing device 12 and are respectively communicated with the inner core cotton 9-21 of the upper blackboard eraser 4 and the inner core cotton 9-21 of the lower blackboard eraser 5, a perforation is arranged on the left frame plate and the right frame plate of the blackboard outer frame 1, wherein one pressurizing pipeline at the bottom of the pressurizing device 12 penetrates through the perforation to be connected with the inner core cotton 9-21 of the lower blackboard eraser 5, and then one dust suction device 10 at the same side can be simultaneously communicated with the inner core cotton 9-21 of the upper blackboard eraser and the lower blackboard eraser, so.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. The up-down push-pull type blackboard with the blackboard eraser is characterized by comprising a blackboard outer frame (1), an upper blackboard (2), a lower blackboard (3), an upper blackboard eraser (4) and a lower blackboard eraser (5), wherein the upper blackboard (2) and the lower blackboard (3) are arranged in a staggered mode from front to back through a built-in track and are in up-down sliding connection with the blackboard outer frame (1) through an elastic device, the upper blackboard eraser (4) and the lower blackboard eraser (5) can be respectively and rotatably transversely erected on the blackboard outer frame (1), the upper blackboard eraser (4) is arranged on the front side of the upper blackboard (2), the lower blackboard eraser (5) is arranged between the upper blackboard (2) and the lower blackboard (3), the upper blackboard eraser (4) and the lower blackboard eraser (5) respectively comprise an arc-shaped outer convex surface and a vertical plane, the upper blackboard eraser (4) is in sliding contact with the upper blackboard (2) through the arc-shaped outer convex surface and is isolated from the upper blackboard, the lower blackboard eraser (5) is in sliding contact with the lower blackboard (3) through an arc-shaped outer convex surface of the lower blackboard eraser and is isolated from the lower blackboard (3) through a vertical plane of the lower blackboard eraser.
2. An up-down push-pull blackboard with a blackboard eraser according to claim 1, which is characterized in that: the blackboard comprises a blackboard outer frame (1), a front rail (1-1) and a rear rail (1-2) are arranged on the inner sides of left and right frame plates of the blackboard outer frame (1) respectively, the front rail (1-1) is symmetrically and concavely arranged at the front ends of the inner side surfaces of the left and right frame plates of the blackboard outer frame (1), the rear rail (1-2) is symmetrically and concavely arranged at the rear ends of the inner side surfaces of the left and right frame plates of the blackboard outer frame (1), an upper blackboard (2) and a lower blackboard (3) are embedded in the front rail (1-1) and the rear rail (1-2) respectively, the bottom of the upper blackboard (2) is connected with a lower frame plate of the blackboard outer frame (1) through a spring (6), and the top of the lower blackboard (3) is connected with the upper frame plate of the blackboard outer frame.
3. A push-pull type up-down blackboard according to claim 2 with blackboard eraser, characterized in that: the blackboard is characterized in that the tops and the bottoms of the upper blackboard (2) and the lower blackboard (3) are respectively provided with a magnet strip (7), the inner sides of the upper frame plate and the lower frame plate of the blackboard outer frame (1) are respectively provided with a ferromagnetic block (8), the top of the upper blackboard (2) is fixed on the inner side of the upper frame plate of the blackboard outer frame (1) through magnetic adsorption, a spring (6) connected with the bottom of the upper blackboard (2) is in a stretching state at the moment, the bottom of the lower blackboard (3) is fixed on the inner side of the lower frame plate of the blackboard outer frame (1) through magnetic adsorption, the spring (6) connected with the top of the lower blackboard (3) is in a stretching state at the moment, the height of the magnet strip (7) is not lower than the height of the spring (6) after the spring (6) is completely compressed, the upper blackboard (2) is fixed and adjusted below through magnetic adsorption at the bottom, the spring (6) connected with the bottom of the upper blackboard, and the spring (6) connected with the top of the lower blackboard (3) is in a compressed state.
4. An up-down push-pull blackboard with a blackboard eraser according to claim 1, which is characterized in that: the upper blackboard eraser (2) and the lower blackboard eraser (3) are identical in structure and respectively comprise a wiping sponge sleeve (9-1) and a blackboard eraser inner core (9-2), the longitudinal section of the wiping sponge sleeve (9-1) is D-shaped, and the wiping sponge sleeve (9-1) is sleeved outside the blackboard eraser inner core (9-2) and is fixed on the blackboard outer frame (1) through the blackboard eraser inner core (9-2).
5. An up-down push-pull blackboard with a blackboard eraser according to claim 4, wherein: the blackboard eraser inner core (9-2) comprises inner core cotton (9-21) and a threaded rod (9-22), the wiping sponge sleeve (9-1) is sleeved outside the inner core cotton (9-21), the inner core cotton (9-21) and the wiping sponge sleeve (9-1) are identical in length and D-shaped in longitudinal section, the inner core cotton (9-21) is sleeved on the threaded rod (9-22), and inner core holes (9-211) are uniformly distributed in the arc-shaped surface of the inner core cotton (9-21).
6. An up-down push-pull blackboard with a blackboard eraser according to claim 5, wherein: the blackboard is characterized in that the top of the upper blackboard (2) and the lower blackboard (3) are magnetic blackboards, soft iron sheets are wrapped between the arc-shaped parts of the wiping sponge sleeve (9-1) and the inner core cotton (9-21), and a plastic shell is wrapped on the side of the plane of the wiping sponge sleeve (9-1).
7. An up-down push-pull blackboard with a blackboard eraser according to claim 6, which is characterized in that: the up-down push-pull blackboard with the blackboard eraser further comprises a dust suction device (10) and a filtering device (11), the filtering device (11) is fixed to the upper portion of the dust suction device (10), air flow inside the filtering device is communicated, and the dust suction device (10) is communicated with inner core cotton (9-21) of the upper blackboard eraser (4) through a pressurizing device (12).
8. An up-down push-pull blackboard with a blackboard eraser according to claim 7, wherein: the lower blackboard eraser (3) is in threaded connection with the blackboard outer frame (1) through threaded rods (9-22), the upper blackboard eraser (2) is in threaded connection with the buckle (13) through the threaded rods (9-22), and the buckle (13) is symmetrically fixed on the left side and the right side of the blackboard outer frame (1) through screws (14).
9. An up-down push-pull blackboard with a blackboard eraser according to claim 8, wherein: the dust suction device (10) comprises a vane motor (10-1), a dust suction shell (10-2) and a dust suction pipeline (10-3), the vane motor (10-1) is eccentrically arranged in the dust absorption shell (10-2) through a bearing, the dust absorption pipeline (10-3) is fixed at the bottom of the dust absorption shell (10-2) and is communicated with the inside of the dust absorption shell (10-2), the dust absorption pipeline (10-3) is communicated with a supercharging device (12), the supercharging device (12) is inserted and connected with supercharging pipeline holes (9-212) through a supercharging pipeline, the pressurizing pipeline holes (9-212) are transversely arranged at the left end and the right end of the inner core cotton (9-21), the inner diameter of the pressurizing pipeline and the bore diameter of the inner core hole (9-211) are both smaller than the inner diameter of the dust suction pipeline (10-3).
10. A push-pull type up-down blackboard according to claim 9 with blackboard eraser, which is characterized in that: the filtering device (11) comprises a filtering sponge (11-1) and a bottomless filtering shell (11-2), the filtering sponge (11-1) is installed in the bottomless filtering shell (11-2) in an interference mode, ventilation holes (11-21) are evenly distributed in the top of the bottomless filtering shell (11-2), a through hole (10-21) is formed in the top of the dust absorption shell (10-2), the bottomless filtering shell (11-2) is fixed on the dust absorption shell (10-2) through a pin, and the through hole (10-21) is communicated with the dust absorption shell (10-2).
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| CN202011130890.XA CN112172384A (en) | 2020-10-21 | 2020-10-21 | From plug-type blackboard about taking blackboard eraser |
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| CN202011130890.XA CN112172384A (en) | 2020-10-21 | 2020-10-21 | From plug-type blackboard about taking blackboard eraser |
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