Automatic cleaning and drying device for blackboard

Abstract

The invention discloses an automatic cleaning and drying device for a blackboard, belongs to the technical field of teaching equipment, and aims to solve the problems of dust pollution, residual calcium compounds on a board surface and incapability of rapid recycling in the prior art. The automatic cleaning and drying device for the blackboard comprises an automatic cleaning system and a drying system control unit, wherein the automatic cleaning system and the drying system are controlled to start and stop through the control unit; the automatic cleaning system comprises a water tank arranged at the bottom of the blackboard; the plurality of fan-shaped nozzles are uniformly arranged at the top of the blackboard along the horizontal direction and are controlled by an electromagnetic water valve; the water pipes are connected among the fan-shaped nozzles; the variable-frequency water pump and the water tank are sequentially connected to one end of the water pipe; and the drying system comprises at least three groups of cross flow fans which are connected in parallel along the horizontal direction.

Description

Technical Field

[0001] The present invention belongs to the technical field of teaching equipment, and particularly relates to an automatic blackboard cleaning and drying device integrating mechanical cleaning, liquid flushing and rapid drying. Background Art

[0002] Traditional blackboard cleaning includes two forms: dry wiping and wet wiping.

[0003] For the dry-wiping method, there are serious problems of dust pollution in the system. When using a traditional blackboard eraser, the instantaneous concentration of PM2.5 in the teacher's breathing area can reach 1200 μg / m, which is 16 times higher than the national standard. The incidence of respiratory diseases among teachers exposed to this environment for a long time is 37% higher than that of the general population. The main component of chalk dust is calcium sulfate, and the particles with a particle size of 5-10 μm account for 65%, which are easy to deposit in the alveoli.

[0004] For the wet-wiping method, using a small amount of water will cause calcium compounds to remain on the board surface, while using a large amount of water will cause water to accumulate on the podium floor or the board surface to remain wet for a long time, making it impossible to be recycled quickly. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic blackboard cleaning and drying device to solve the problems of dust pollution, calcium compounds remaining on the board surface and inability to be recycled quickly existing in the prior art.

[0006] To achieve the above purpose, the automatic blackboard cleaning and drying device of the present invention includes: an automatic cleaning system and a drying system control unit, which controls the start and stop of the automatic cleaning system and the drying system through the control unit;

[0007] The automatic cleaning system includes:

[0008] A water tank provided at the bottom of the blackboard;

[0009] A plurality of sector nozzles uniformly arranged horizontally at the top of the blackboard, and the sector nozzles are controlled by electromagnetic water valves;

[0010] A water pipe connected between the plurality of sector nozzles;

[0011] And a variable-frequency water pump and a water tank connected in sequence to one end of the water pipe;

[0012] The drying system includes at least three groups of cross-flow fans connected in parallel horizontally.

[0013] The drying system further includes a PTC heating element linked with the cross-flow fan.

[0014] The distance between adjacent two nozzles is 150 mm ± 5 mm.

[0015] A multi-stage filtering device is provided inside the water tank, which sequentially includes a 50μm coarse filter layer and a 5μm fine filter layer from bottom to top.

[0016] A drain valve is provided at the bottom of the water tank.

[0017] A transparent liquid level window is provided on the side wall of the water tank 103.

[0018] The beneficial effects of the present invention are as follows: The automatic blackboard cleaning and drying device of the present invention adopts a dust removal technology with water mist wrapping: In the spraying stage, a 0.1% polyacrylamide PAM solution can be added, and the dust settlement efficiency is increased to 99.2%; the PM2.5 concentration in the breathing zone is stabilized in the range of 35 - 48 μg / m 3 range; during the drying process, drying is achieved through two stages of blowing and heating, with high drying efficiency and low energy consumption; the present invention effectively solves the problems of dust pollution, residual calcium compounds on the board surface, and inability to be recycled quickly. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the automatic blackboard cleaning and drying device of the present invention.

[0020] Among them: 101, blackboard; 102, water tank; 103, water tank; 104, variable frequency water pump; 105, water pipe; 106, electromagnetic water valve; 107, sector nozzle. Detailed Embodiments

[0021] The embodiments of the present invention will be further described below in conjunction with the drawings.

[0022] See Figure 1 , the automatic blackboard cleaning and drying device of the present invention includes: an automatic cleaning system 100, a drying system 200, and a control unit, which controls the start and stop of the automatic cleaning system 100 and the drying system 200;

[0023] The automatic cleaning system 100 includes:

[0024] A water tank 102 provided at the bottom of the blackboard 101;

[0025] A plurality of sector nozzles 107 uniformly arranged horizontally at the top of the blackboard 101, and the sector nozzles 107 are controlled by an electromagnetic water valve 106;

[0026] A water pipe 105 connected between the plurality of sector nozzles 107;

[0027] And a variable frequency water pump 104 and a water tank 103 sequentially connected to one end of the water pipe 105;

[0028] The drying system 200 includes at least three groups of cross-flow fans 201 connected in parallel horizontally.

[0029] The drying system 200 further includes a PTC heating element linked to the cross-flow fan 201.

[0030] The water tank 103 is provided with a multi-stage filtering device, which sequentially includes a 50μm coarse filter layer and a 5μm fine filter layer from bottom to top.

[0031] The water trough 102 is installed at the bottom edge of the blackboard 101, has a slope, and its length matches the width of the blackboard, and is used to collect the wastewater after cleaning. A drain valve is provided at the bottom of the water trough 102 to regularly discharge the wastewater into the sewer pipe.

[0032] A plurality of sector nozzles 107 are evenly fixed on the top of the blackboard through brackets. The center distance between adjacent nozzles is 150mm (tolerance ±5mm) to ensure that the overlap rate of the spraying coverage area is ≥30%. The spraying angle of the nozzles is adjusted to 30°-45° to cover the effective writing area of the blackboard.

[0033] The water pipe 105 uses a pressure-resistant PVC hose to connect all the sector nozzles 107 to form a parallel water circuit. One end of the water pipe 105 is connected to the outlet of the variable-frequency water pump 104 through a flange, and the inlet of the variable-frequency water pump 104 is connected to the bottom of the water tank 103 through a pipeline. The rated flow of the water pump is 10L / min, the pressure is 0.3MPa, and the frequency conversion range is 20-50Hz to adjust the water flow intensity.

[0034] The two-stage filtering device of the water tank 103:

[0035] Coarse filter layer: Adopt a 50μm stainless steel filter screen, located at the lower part, to intercept larger particle impurities;

[0036] Fine filter layer: Adopt a 5μm PP cotton filter element, located above the coarse filter layer, to further purify the water quality.

[0037] A transparent liquid level window is provided on the side wall of the water tank 103, and a low water level sensor can also be configured to prevent the variable-frequency water pump 104 from idling.

[0038] Three groups of cross-flow fans 201 are horizontally installed in parallel on the top of the blackboard. The power of each group of fans is 80W, and the air volume is ≥15m 3 / min. The air outlet of the cross-flow fan 201 faces the surface of the blackboard and forms a 15° inclination angle with the blackboard plane to form a uniform air curtain.

[0039] A 500W PTC ceramic heating sheet is installed at the air outlet of each group of cross-flow fans 201, and the heating temperature is controlled by a thermostat between 40-60°C to prevent the blackboard from overheating and deforming.

[0040] The working process is as follows:

[0041] After starting the cleaning mode, the control unit sequentially executes:

[0042] Turn on the electromagnetic water valve 106 and the variable frequency water pump 104, adjust the frequency of the variable frequency water pump 104 to 40 Hz, and spray water for 60 seconds;

[0043] Turn off the variable frequency water pump 104 and let it stand for 10 seconds to allow the sewage to flow into the water tank 102;

[0044] Start the drying system 200 and run for 5 minutes until the blackboard surface is completely dry.

[0045] The sector nozzle 107 can adopt a self-rotating sector nozzle. During cleaning, the nozzle rotates at 10 r / min to improve the coverage uniformity.

[0046] In summer or high-temperature environments, the control unit only starts the fan and does not enable PTC heating, and uses natural wind for drying.

[0047] A retractable baffle is installed above the water tank 102 and is unfolded during cleaning to prevent water mist from splashing.

Claims

1. Automatic blackboard cleaning and drying device, characterized in that: include: An automatic cleaning system (100) and a drying system (200) control unit, which controls the start and stop of the automatic cleaning system (100) and the drying system (200); The automatic cleaning system (100) comprises: A water tank (102) provided at the bottom of the blackboard (101); A plurality of fan-shaped nozzles (107) are evenly arranged on the top of the blackboard (101) in a horizontal direction, and the fan-shaped nozzles (107) are controlled by an electromagnetic water valve (106); A water pipe (105) connected between the plurality of fan-shaped nozzles (107); and a variable frequency water pump (104) and a water tank (103) connected in sequence to one end of the water pipe (105); The drying system (200) comprises at least three groups of cross-flow fans (201) connected in parallel along the horizontal direction.

2. The automatic blackboard cleaning and drying device according to claim 1 is characterized in that: The drying system (200) further comprises a PTC heating element linked to the cross-flow fan (201).

3. The automatic blackboard cleaning and drying device according to claim 1 is characterized in that: The distance between two adjacent nozzles is 150mm±5mm.

4. The automatic blackboard cleaning and drying device according to claim 1 is characterized in that: The water tank (103) is provided with a multi-stage filtering device, which comprises, from bottom to top, a 50 μm coarse filtering layer and a 5 μm fine filtering layer.

5. The automatic blackboard cleaning and drying device according to claim 1 is characterized in that: A drain valve is provided at the bottom of the water tank (102).

6. The automatic blackboard cleaning and drying device according to claim 1 is characterized in that: The side wall of the water tank 103 is provided with a transparent liquid level window.

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