Adsorption type blackboard eraser box and blackboard with same

Abstract

The invention relates to an adsorption type blackboard eraser box which comprises a rectangular box body with at least one sealed cavity, a dust receiving plate is arranged on the bottom face of the rectangular box body, a partition plate is arranged in the sealed cavity, a rubber plug plate is arranged on the bottom face of the partition plate, a shaft rod is movably connected to the top face of the rectangular box body, and a connecting arm is arranged on the top face of the shaft rod. The lower end of the shaft rod penetrates through the partition plate and is fixed to the rubber plug plate. Compared with a traditional blackboard eraser, the blackboard eraser is designed to be of a rectangular box body structure, the dust collection plate is arranged in the blackboard eraser, the dust collection plate can be opened through drawing of the shaft rod and the one-way valve arranged on the bottom face of the rectangular box body, and dust on a blackboard is adsorbed through a seam formed between the dust collection plate and the rectangular box body; according to the scheme, a blackboard with the blackboard eraser box is further designed, a traction mechanism, a main shaft and a compression spring lifting mechanism are arranged on the blackboard, the lifting mechanism is arranged on the left side of the blackboard and drives the adsorption type blackboard eraser box to move up and down under the cooperation of the compression spring lifting mechanism, and the overall structure is ingenious.

Description

Technical Field

[0001] The invention relates to the technical field of teaching tools, in particular to an adsorption type blackboard eraser box and a blackboard with the blackboard eraser box. Background Art

[0002] Rejuvenating the country through science and education is a national priority. Teaching aids, as the primary carrier of education, should be safe, reliable and convenient. Chalk, the writing tool used in the teaching process, will produce a lot of fine dust particles when it is erased and cleaned. After entering the respiratory tract, it is easy to affect human health. Teaching aids should also be innovated for human health.

[0003] Among the technologies for improving blackboard brushes, for example, on January 13, 2020, the applicant, Chongqing Urban Management Vocational College, designed a "Retractable Blackboard Eraser Device", whose structure is a common wiping design, and a brush is set on the bottom of the blackboard brush, but this structure does not adsorb dust; in the improved technology, some use a storage water tank to reduce dust, for example, on January 15, 2007, the applicant Zhao Shuangyu designed the "Vacuum Blackboard Brush". Since the water in the water tank can easily penetrate outward along the bristles, this design will affect the writing effect due to the presence of water. Its defect is that water is required to achieve the dust removal effect. In view of this, the applicant has independently thought about and designed a completely different dust removal structure, and specially applied for this invention. Summary of the invention

[0004] In order to solve the above-mentioned prior art problems, the present invention provides an adsorption type blackboard eraser box which can improve the above-mentioned deficiencies.

[0005] The present invention relates to an adsorption type blackboard eraser box, which is used for always keeping close contact with a blackboard and being arranged to move up and down, and comprises a rectangular box body with at least one sealed cavity, a dust collecting plate is arranged on the bottom surface of the rectangular box body, a one-way valve is arranged on the bottom surface of the rectangular box body and is opposite to the dust collecting plate, a partition is arranged in the sealed cavity, a rubber plug is arranged on the bottom surface of the partition, a shaft rod is movably connected (interspersed) on the top surface of the rectangular box body, a connecting arm is arranged on the top surface of the shaft rod, and the lower end of the shaft rod passes through the partition and is fixed to the rubber plug.

[0006] Furthermore, a slit is formed between the dust collecting plate and the rectangular box body, a brush is arranged on the back side of the rectangular box body near the slit, and the outer edge of the contact plate close to the blackboard is just below the brush. When the shaft moves upward, the chalk dust falling from the brush can be sucked into the rectangular box body through the slit and the one-way valve.

[0007] Furthermore, the number of the sealed cavities is ten.

[0008] Furthermore, when the partition moves upward, the chalk dust dropped when erasing the blackboard can be sucked into the blackboard eraser box, and at the same time, the gas sucked last time can be filtered out after the chalk dust is discharged.

[0009] Furthermore, an upper horizontal slide groove is provided on the top of the rectangular box body, a slider is provided in the horizontal slide groove, one end of the slider is connected to a horizontal spring, and the horizontal spring is fixed to the top surface of the right side of the rectangular box body through a spring mounting column. The horizontal slide groove has an adjustment area on the side away from the spring mounting column, an isolation block is provided in the adjustment area, the adjustment area and the isolation block form a U-shaped structure, a wedge-shaped locking structure is provided on the U-shaped structure, and the slider can be locked or unlocked using the U-shaped structure.

[0010] The present invention also provides a blackboard with an eraser box, including the aforementioned adsorption-type blackboard eraser box, and also includes a blackboard, a traction mechanism, a main shaft, a compression spring lifting mechanism, and a groove cross bar. The main shaft is arranged on the top surface of the blackboard, the compression spring lifting mechanism is arranged on the main shaft, the adsorption-type blackboard eraser box is movably arranged on the surface of the blackboard, the traction mechanism is arranged on the blackboard and drives the adsorption-type blackboard eraser box to move up and down with the cooperation of the compression spring lifting mechanism.

[0011] Furthermore, the compression spring lifting mechanism is sleeved on the main shaft, and includes a main spring and sleeves arranged at both ends of the main spring. The lower ends of the sleeves are rotatably connected to spring telescopic shafts. A connecting head is arranged under the main shaft, and the two ends of the connecting head are respectively rotatably connected to the spring telescopic shaft. The connecting head is fixed in the middle of the connecting rod and the connecting arm.

[0012] Furthermore, a plurality of partition bars are arranged at intervals on the surface of the blackboard, vertical slide grooves are arranged on the partition bars, the adsorption type blackboard eraser box is arranged between two slide bars, and the two ends of the connecting arm are respectively slidably connected to the vertical slide grooves.

[0013] Furthermore, a rack is arranged outside the slide bar, and the end surface of the rectangular box body is rotatably connected to a gear, and the gear and the rack are meshed to cooperate with the up and down movement of the rectangular box body.

[0014] Furthermore, the traction mechanism includes a fixed pulley arranged on the upper left side of the rectangular box body and a rotating wheel at the lower side, as well as a rotating chain linking the rotating wheel and the fixed pulley, and also includes a groove cross bar. A recessed cross bar is arranged on the front side of the blackboard, and there is an outer protrusion on the groove cross bar. The groove cross bar is fixed to the chain through a triangular block.

[0015] Furthermore, a sleeve and a wire bracket are arranged on the left side of the top surface of the rectangular box body, a pull rope is arranged on the sleeve and the wire bracket, the free end of the pull rope hangs down below the rectangular box body, and the other end of the pull rope is fixed to the slider.

[0016] The design of the present invention is ingenious. Compared with the traditional blackboard eraser, it is designed as a rectangular box structure, in which a dust collecting plate is arranged inside. The dust collecting plate can be opened by pulling the shaft rod, and the one-way valve arranged on the bottom surface of the rectangular box body can be opened. The dust collecting plate and the rectangular box body are formed through the gap to achieve the adsorption of powder on the blackboard to achieve the dust removal effect. At the same time, the present scheme also designs a blackboard with the blackboard eraser box, and a traction mechanism, a main shaft, and a compression spring lifting mechanism are arranged on the blackboard. The lifting mechanism is arranged on the left side of the blackboard and drives the adsorption type blackboard eraser box to move up and down with the cooperation of the compression spring lifting mechanism. The overall structure is ingenious. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the end surface structure of an adsorption-type blackboard eraser box.

[0018] Figure 2 It is a schematic diagram of the internal structure of an adsorption-type blackboard eraser box.

[0019] Figure 3 It is a three-dimensional picture of an adsorption-type blackboard eraser box.

[0020] Figure 4 It is a schematic diagram of the local structure of the top slide.

[0021] Figure 5 This is a schematic diagram of the blackboard structure.

[0022] Figure 6 This is a schematic diagram of the blackboard end surface structure.

[0023] Figure 7 This is a schematic diagram of the internal structure of the blackboard.

[0024] Figure 8 for Figure 5 A partial enlarged view.

[0025] Fig. 9 This is a contact relationship diagram between the slider and the wedge-shaped locking structure.

[0026] Fig.10 This is the contact relationship diagram of the slider when it is in the reflow channel.

[0027] Fig.11 Schematic diagram of the wedge locking structure.

[0028] Fig.12 It is a schematic diagram of the one-way intake valve structure.

[0029] Figure: 1 rectangular box, 101 front sliding cover, 102 brush, 2 dust collecting plate, 201 seam, 3 shaft rod, 4 connecting arm, 5 sealing cavity, 51 adsorption cavity, 7 rubber plug plate, 8 one-way valve, 81 air inlet, 82 baffle, 83 rotating shaft, 9 partition, 10 blackboard, 11 connecting rod, 12 connector, 13 telescopic rod, 14 secondary spring, 15 main shaft, 16 sleeve, 17 main spring, 18 connecting block, 19 bearing, 19 fixed pulley, 20 partition, 201 vertical slide, 21 rack, 22 gear, 13 groove cross bar, 231 convex part, 24 triangle block, 2 5 rotating wheel, 251 handle, 26 chain, 27 pull rope, 28 sleeve, 281 wire bracket, 29 slider, 30 horizontal slide groove, 31 adjustment area, 32, isolation block, 33 wedge-shaped locking structure, 331 compression spring, 332 spring piece, 333, 31 fixed mounting block, 34 horizontal spring, 333 mounting groove, 311 separation groove, 312 connecting groove, 313 reflux groove, 314 locking groove, 321 wedge-shaped front end, 322 wedge-shaped rear end, 3141 upper concave sliding surface, 3131 lower concave sliding surface, 3221 steering curved surface, A reflux front area, B reflux rear area. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] like Figure 1-3 As shown, the present invention relates to an adsorption type blackboard eraser box, which is used to always keep close contact with the blackboard and be set to move up and down, including a rectangular box body 1 with at least one sealed cavity, the front opening of the rectangular box body is provided with a sliding cover slot, a front sliding cover 101 is arranged in the sliding cover slot, a dust collecting plate 2 is arranged on the bottom surface of the rectangular box body, a dust suction hole is arranged on the bottom surface of the rectangular box body, and chalk dust can enter the sealed cavity through the dust suction hole, a one-way valve 8 is arranged next to the dust suction hole and opposite to the dust collecting plate, and the one-way valve 8 is a boss structure, such as Fig.11 As shown, it includes a conical air inlet cylinder 81 and a baffle 82 arranged on the air inlet cylinder through a rotating shaft 83, which is higher than the bottom surface of the rectangular box body by a certain distance, so that chalk dust can fall on the bottom surface of the rectangular box body and be isolated from the one-way valve mouth; a partition 9 is arranged in the sealed cavity, and a one-way valve is arranged on the partition, the partition divides the sealed cavity into two, and an adsorption cavity 5 is formed under the partition, a rubber plug plate 7 is arranged on the bottom surface of the partition, the rubber plug plate is elastic, and it is arranged to slide in contact with the inner wall of the sealed cavity, the top surface of the rectangular box body is interspersed with a shaft rod 3 that is movably connected, wherein an exhaust hole is provided between the shaft rod and the top surface of the rectangular box body, and filter paper is arranged in the exhaust hole as the first chalk dust filtering structure, a connecting arm 4 is arranged on the top surface of the shaft rod, and the lower end of the shaft rod passes through the partition and is fixed to the rubber plug plate.

[0032] As a technical improvement, a slit 201 is formed between the dust collecting plate and the rectangular box body, and a brush 102 is arranged above the slit position on the back of the rectangular box body. The outer edge of the contact plate close to the blackboard is just below the brush. When the shaft moves upward, the chalk dust falling from the brush can be sucked into the rectangular box body through the slit and the one-way valve. The dust collecting plate is designed to be inclined. When the dust falls on the dust collecting plate, it will move downward along the surface of the dust collecting plate. The end of the dust collecting plate is upwardly sealed with the bottom surface of the rectangular box body. The outer edge of the dust collecting plate needs to protrude from the back of the rectangular box body to facilitate dust collection.

[0033] As a technical improvement, from a practical point of view, the efficiency of wiping the blackboard is increased. The length of the rectangular box body is controlled at 100 cm, and the number of sealed cavities is 10. In terms of the effect of use, an adsorption blackboard eraser box designed in this scheme moves upward through the connecting arm, and the movement of the rubber plug plate is driven by the shaft rod, which causes the one-way valve on the bottom of the rectangular box body to open. Through the pressure difference, the dust on the dust collection plate can be sucked into the adsorption chamber, and the sealing plate can be opened for cleaning.

[0034] As a technical improvement, when the partition moves upward, the chalk dust dropped when erasing the blackboard can be sucked into the blackboard eraser box, and at the same time, the gas sucked last time can be filtered to remove the chalk dust and discharged from the exhaust hole.

[0035] As a technical improvement, an upper horizontal slide groove 30 is provided on the top of the rectangular box body, a slider 29 is provided in the horizontal slide groove, one end of the slider is connected to a horizontal spring 34, and the horizontal spring is fixed on the right top surface of the rectangular box body through a spring mounting 31 column. The side of the horizontal slide groove away from the spring mounting column has an adjustment area 31, and an isolation block 32 is provided in the adjustment area. The adjustment area and the isolation block form a slide groove of a U-shaped structure, and a wedge-shaped locking structure is provided on the U-shaped structure. The slider can be locked or unlocked by using the U-shaped structure, which is easy to operate. When the slider passes over the wedge-shaped locking structure, the driving force is removed. At this time, the slider is acted upon by the spring force to push back against the wedge-shaped locking structure to achieve slider locking. When unlocking is required, the slider is pulled forward, and under the guidance of the U-shaped slider slide groove, the slider realizes automatic track change and returns to the initial position from the side without the wedge-shaped locking structure.

[0036] like Figure 4-8As shown, the present invention also designs a blackboard with a blackboard eraser box, including the aforementioned adsorption type blackboard eraser box, and also includes a blackboard, a traction mechanism, a main shaft 15, a compression spring lifting mechanism, and a groove cross bar. The main shaft is arranged on the top surface of the blackboard, and the two ends of the main shaft are respectively fixed to the two sides of the blackboard. The compression spring lifting mechanism is arranged on the main shaft. The adsorption type blackboard eraser box is movably arranged on the surface of the blackboard and is linked to the compression spring lifting mechanism. The traction mechanism is arranged on the left side of the blackboard and drives the adsorption type blackboard eraser box to move up and down with the cooperation of the compression spring lifting mechanism.

[0037] As a technical improvement, the compression spring lifting mechanism is sleeved on the main shaft 15, and the compression spring lifting mechanism includes a main spring 17 and a sleeve 16 arranged at both ends of the main spring. A connecting block 18 is arranged at the lower end of the sleeve, and a spring telescopic shaft is rotatably connected to the connecting block. The connecting block is connected to the upper end of the elastic telescopic shaft. The spring telescopic shaft includes a telescopic rod 13 and a secondary spring 14 sleeved on the telescopic shaft. A connecting head 12 is arranged under the main shaft, and the two ends of the connecting head are respectively rotatably connected to the lower ends of the two spring telescopic shafts, and the connecting head is fixed in the middle of the connecting arm 4 through the connecting rod 11.

[0038] As a technical improvement, four partition bars 20 are arranged at intervals on the surface of the blackboard, and vertical slide grooves 201 are arranged on the opposite surfaces of two adjacent partition bars. The adsorption type blackboard eraser box is arranged between the two slide bars, and the two ends of the connecting arm are respectively slidably connected to the vertical slide grooves to form three writing areas on the blackboard.

[0039] As a technical improvement, racks 21 are provided on the outer sides of the two slide bars in the middle of the blackboard, and gears 22 are rotatably connected on the end faces of the rectangular box at this position, and the gears and racks are meshed with each other to cooperate with the up and down movement of the rectangular box.

[0040] As a technical improvement, the traction mechanism includes a fixed pulley 19 and a rotating wheel 25 at the upper left side of the rectangular box body, as well as a chain 26 for rotating the rotating wheel and the fixed pulley. Three grooved cross bars 23 are also provided to cooperate with the movement of the traction mechanism. A recessed cross bar is provided on the front of the blackboard. There is an outer protrusion 231 on the grooved cross bar. There is a certain distance between the outer protrusion and the end of the grooved cross bar. The grooved cross bar is fixed to the chain through a triangular block 24. By rotating the rotating wheel 25 through the hand wheel 251, the grooved cross bar 23 can move up and down on the front of the blackboard.

[0041] As a technical improvement, two sleeves 28 and a wire bracket 281 are arranged on the left side of the top surface of the rectangular box body, and a pull rope 27 is arranged on the sleeve and the wire bracket to pass through. The free end of the pull rope hangs down below the rectangular box body, and the other end of the pull rope is connected and fixed to a slider 29. The movement of the slider will be restricted by the outer protrusion, that is, the slider cannot be close to the end position. The slider is arranged on a horizontal slide groove, and the horizontal slide groove is arranged on the top surface of the rectangular box body. The slider is connected with a horizontal spring 34, and the horizontal spring is arranged on the right top surface of the rectangular box body through a fixed mounting block 31.

[0042] As a technical improvement, Figure 4 , Figure 9-12 As shown, a wedge-shaped locking structure 33 is provided on the U-shaped structure, and the wedge-shaped locking structure includes a compression spring 331 and an obliquely arranged spring piece 332. A mounting groove 333 is provided on the slideway of the U-shaped structure, and a compression spring and a spring piece are arranged in the mounting groove, wherein the oblique upper end of the spring piece is pressed on the top of the spring, and the oblique lower end of the spring piece is fixed to the bottom of the mounting groove, and the raised section of the spring piece is higher than the bottom surface of the slideway of the U-shaped structure, and the slider can be locked or unlocked by using the horizontal slide groove, and the slider is driven to move on the horizontal slide groove by the pull rope on the left side of the blackboard. When the slider slides to the wedge-shaped locking structure, the slider is fixed. At this time, the adsorption type blackboard eraser boxes on the three blackboard writing areas are linked as a whole through the groove cross bar, and the overall blackboard erasing work is realized by the rotation of the chain. Since pull ropes are provided on the three blackboard areas, the blackboard eraser boxes on different areas can be freely combined, and each area can be used separately or combined through the groove cross bar.

[0043] Furthermore, in order to facilitate the movement of the control slider in the U-shaped structure, the slide groove of the U-shaped structure includes a separation groove 311, a connecting groove 312, a return groove 313 and a locking groove 314. The inner walls on both sides of the locking groove maintain the same spacing as the inner walls on both sides of the horizontal slide groove 33 and are located on the same horizontal line. One end of the separation groove and one end of the locking groove (as the front end of the locking groove) intersect with the horizontal slide groove together, and the isolation block has a wedge-shaped front end 321 near the intersection. The separation groove is connected to the connecting groove, and one end of the connecting groove is connected to one end of the return groove. , the other end of the reflux groove is connected to the other end of the locking groove, the reflux groove serves as the intersection of the connecting groove and the locking groove, and the isolation block is provided with a wedge-shaped rear end 322 at the intersection, in order to facilitate the sliding block to turn at the wedge-shaped rear end and slide more easily, wherein the reflux groove side wall at the rear end of the locking groove away from the isolation block has an upper concave sliding surface 3141, and in the direction of sliding of the slider, the width of the concave sliding groove surface and the outer wall of the isolation block 32 are non-equal width structures, and a front narrow rear end structure is formed from the rear end of the locking groove to the front end of the reflux groove, and the rear end of the connecting groove is away from the isolation block. The side wall has a lower concave sliding surface 3131, and the lower concave sliding surface is connected with the upper concave sliding surface to form a side wall of the reflux channel, wherein the reflux channel is located in the section where the lower concave sliding surface is located as the reflux front area A, and the section where the upper concave sliding surface is located is the reflux rear area B. After the slider enters the upper concave sliding surface from the rear end of the locking slide, it will be naturally "lifted" (here the lifting refers to the distance from the slider to the slide cover in the horizontal slideway), and under the action of the spring, it will naturally slide into the reflux rear area. In order to further facilitate the sliding of the slider in the reflux front area, a turning curved surface 3 is set at the wedge rear end close to the upper concave screen side. 221, its advantage is that the slider cooperates with the upper concave sliding surface here to form an initial action of naturally "lifting" the slider, allowing the slider to naturally transfer into the reflux rear area, and the groove width from the starting end of the reflux rear area to the ending end is a front narrow and rear wide structure. This design makes it easier for the slider to slide into the connecting groove here. The starting end refers to the contact position between the upper concave sliding surface and the lower concave sliding surface to the tip of the wedge-shaped rear end, and the ending end refers to the contact position between the lower concave sliding surface and the connecting groove away from the isolation block to the contact position between the wedge-shaped rear end in the reflux rear area and the connecting groove rear end close to the isolation block.

[0044] An overview of usage: in a free state, the three rectangular box bodies 1 are at the upper end of the blackboard, and the rubber plug plate 7 is at the bottom of the rectangular box body 1. The blackboard is in working state when it is necessary to erase it. In the working state, the adsorption type blackboard eraser box is driven downward by manual pulling or other means. At this time, the rubber plug plate 7 is hindered by the telescopic rod 13, and the rubber plug plate 7 moves downward, but its speed is less than that of the rectangular box body 1, so that the volume of the adsorption chamber 51 gradually increases and forms a relative vacuum state. The one-way valve 8 is opened under atmospheric pressure, and the chalk dust is sucked into the adsorption chamber 51. When the area to be erased has been wiped off, the rectangular box body 1 is driven upward manually or by other means. At this time, the air pressure in the sealed cavity is the same as the atmospheric pressure, and the one-way valve 8 is closed under the action of its own gravity. At the same time, due to the combined effect of the length stroke of the telescopic rod 13 and the auxiliary spring 14, the rubber plug plate 7 moves downward, and the gas (a mixture of air and chalk dust) in the adsorption chamber 51 is compressed by the rubber plug plate 7. Under the action of pressure, the one-way valve 8 set on the upper part of the rubber plug plate 7 is pushed open, and the gas enters the area between the rubber plug plate 7 and the top of the rectangular box body 1; it is particularly pointed out that when the gas passes through the one-way valve 8 from the adsorption chamber 51, the chalk dust in the gas is adsorbed by the filter paper in the one-way valve 8, and the remaining gas passes through the one-way valve 8 and enters the area between the rubber plug plate 7 and the top of the rectangular box body 1. When the blackboard is wiped next time, the rubber plug plate 7 moves upward from the bottom of the rectangular box body 1 again, squeezing the gas in this area and forcing it to be discharged through the exhaust hole. Filter paper is set in the exhaust hole as a second chalk dust filtering mechanism to further prevent the discharge of chalk dust. .

Claims

1. An adsorption type blackboard eraser box, characterized in that: It is used to always keep in close contact with the blackboard, including a rectangular box body with at least one sealed cavity, a dust collecting plate is arranged below the bottom surface of the rectangular box body, a one-way valve is arranged on the bottom surface of the rectangular box body and is opposite to the dust collecting plate, a partition is arranged in the sealed cavity, a rubber plug plate is arranged on the bottom surface of the partition, a shaft rod is movably connected to the top surface of the rectangular box body, a connecting arm is arranged on the top surface of the shaft rod, and the lower end of the shaft rod passes through the partition plate and is fixed to the rubber plug plate.

2. The adsorption type blackboard eraser box according to claim 1, characterized in that: A slit is formed between the dust collecting plate and the rectangular box body, a brush is arranged near the slit on the back of the rectangular box body, and the outer edge of the contact plate close to the blackboard is just below the brush. When the shaft moves upward, the chalk dust falling from the brush can be sucked into the rectangular box body through the slit and the one-way valve.

3. The adsorption type blackboard eraser box according to claim 2, characterized in that: The number of the sealed cavities is ten.

4. The adsorption type blackboard eraser box according to claim 2, characterized in that: When the partition moves upward, the chalk dust dropped when erasing the blackboard can be sucked into the blackboard eraser box, and the gas sucked last time can be filtered out after the chalk dust is removed and discharged.

5. The adsorption type blackboard eraser box according to claim 4, characterized in that: An upper horizontal slide groove is provided on the top of the rectangular box body, a slider is provided in the horizontal slide groove, one end of the slider is connected to a horizontal spring, and the horizontal spring is fixed to the top surface of the right side of the rectangular box body through a spring mounting column. The horizontal slide groove has an adjustment area on the side away from the spring mounting column, an isolation block is provided in the adjustment area, the adjustment area and the isolation block form a ring-shaped "U" structure, a wedge-shaped locking structure is provided on the "U" structure, and the slider can be locked or unlocked by using the "U" structure.

6. A blackboard with a blackboard eraser box, characterized in that: It includes the adsorption type blackboard eraser box as described in any one of claims 1 to 3, and also includes a blackboard, a traction mechanism, a main shaft, a compression spring lifting mechanism, and a groove cross bar, the main shaft is arranged on the top surface of the blackboard, the compression spring lifting mechanism is arranged on the main shaft, the adsorption type blackboard eraser box is movably arranged on the surface of the blackboard, the traction mechanism is arranged on the blackboard and drives the adsorption type blackboard eraser box to move up and down with the cooperation of the compression spring lifting mechanism.

7. A blackboard with a blackboard eraser box according to claim 6, characterized in that: The compression spring lifting mechanism is sleeved on the main shaft, and includes a main spring and sleeves arranged at both ends of the main spring. The lower ends of the sleeves are rotatably connected to spring telescopic shafts. A connecting head is arranged below the main shaft. The two ends of the connecting head are respectively rotatably connected to the spring telescopic shaft. The connecting head is fixed in the middle of the connecting rod and the connecting arm.

8. A blackboard with a blackboard eraser box according to claim 6, characterized in that: A plurality of partition bars are arranged at intervals on the blackboard surface, vertical slide grooves are arranged on the partition bars, the adsorption type blackboard eraser box is arranged between two slide bars, and the two ends of the connecting arm are respectively slidably connected with the vertical slide grooves.

9. A blackboard with a blackboard eraser box according to claim 8, characterized in that: A rack is arranged outside the slide bar, and the end surface of the rectangular box body is rotatably connected to a gear, and the gear and the rack are meshed to cooperate with the up and down movement of the rectangular box body.

10. A blackboard with a blackboard eraser box according to claim 6 or 7, characterized in that: The traction mechanism includes a fixed pulley arranged on the upper left side of the rectangular box body and a rotating wheel at the lower side, as well as a rotating chain linking the rotating wheel and the fixed pulley, and also includes a groove cross bar. A recessed cross bar is arranged on the front side of the blackboard. There is an outer convex part on the groove cross bar, and the groove cross bar is fixed to the chain through a triangular block.

11. A blackboard with a blackboard eraser box according to claim 10, characterized in that: A sleeve and a wire bracket are arranged on the left side of the top surface of the rectangular box body, and a pull rope is sleeved on the sleeve and the wire bracket. The free end of the pull rope hangs down below the rectangular box body, and the other end of the pull rope is connected to the slider.

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