Air flotation machine for papermaking

Abstract

The utility model relates to the technical field of air flotation machines, in particular to an air flotation machine for papermaking, which comprises an air flotation area, a foam scraping area and a controller, the foam scraping area is communicated with the air flotation area, a main bubble generating unit and an auxiliary bubble generating unit are arranged in the air flotation area, and the bottom of the air flotation area is connected with a water supply pump through a water inlet pipe. The water inlet pipe is provided with a flow sensor used for detecting the water inlet flow, the output end of the flow sensor is connected with the input end of the controller and used for providing a water inlet flow signal for the controller, and the output end of the controller outputs a control signal. The control signal is used for controlling the operation of the main bubble generation unit and the auxiliary bubble generation unit, and the main bubble generation unit, the auxiliary bubble generation unit, the controller and the flow sensor are arranged, so that the problems of poor wastewater treatment effect and high treatment cost caused by mismatching of a gas generator and water inlet flow in an air flotation machine in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air flotation machines, in particular to an air flotation machine for papermaking. Background Art

[0002] The flotation machine is used to purify wastewater in the paper production process so that the wastewater can be recycled and utilized, and the fiber in the wastewater can be recovered at the same time. Its main working principle is to mix boiling water with liquid medicine, and then use a bubble generator to generate bubbles. The bubbles bring the suspended matter in the water to float up, and then use a scraper to scrape out the floating suspended matter to achieve the effect of removing the suspended matter in the wastewater. The problem with the prior art is that there is no good matching relationship between the existing flotation machine wastewater inlet flow rate and the bubble generator. When the inlet flow rate is low, multiple bubble generators work synchronously, resulting in increased costs. When the inlet flow rate is high, the bubble generator cannot fully react and contact with the wastewater, resulting in poor suspended matter removal effect. Based on the above situation, it is necessary to design a papermaking flotation machine to solve the above problems. Utility Model Content

[0003] The utility model provides an air flotation machine for papermaking, so as to solve the problem that the gas generator in the air flotation machine in the prior art does not match the water inlet flow, resulting in poor wastewater treatment effect and high treatment cost.

[0004] The technical problem solved by the utility model is achieved by the following technical solutions:

[0005] A flotation machine for papermaking comprises an air flotation zone, a foam scraping zone connected to the air flotation zone, and a controller. A main bubble generating unit and a secondary bubble generating unit are arranged in the air flotation zone. A water supply pump is connected to the bottom of the air flotation zone through a water inlet pipe. A flow sensor for detecting the water inlet flow is arranged on the water inlet pipe. The output end of the flow sensor is connected to the input end of the controller to provide the controller with a signal of the water inlet flow. The output end of the controller outputs a control signal, and the control signal is used to control the operation of the main bubble generating unit and the secondary bubble generating unit.

[0006] Preferably, the output end of the main bubble generating unit is lower than the output end of the secondary bubble generating unit, and the air flotation area is in a cone shape with a diameter gradually decreasing from top to bottom.

[0007] Preferably, the main bubble generating unit and the secondary bubble generating unit are both fixed by a disc arranged above the air flotation zone, the secondary bubble generating unit is in multiple numbers, and the secondary bubble generating units are evenly distributed circumferentially along the axis of the air flotation zone.

[0008] Preferably, a water pump connected through a water outlet pipe is also provided on one side of the scraping area, and a liquid level sensor for detecting the water level in the scraping area is also provided on the scraping area. The output end of the liquid level sensor is connected to the controller to provide the controller with a water level signal of the scraping area. The output end of the controller outputs a control signal, and the control signal is used to control the operation of the water pump.

[0009] Preferably, a conveyor belt is arranged above the scraping area, the conveyor belt is driven by a motor, scrapers are arranged on the upper surface and the lower surface of the conveyor belt, and the motor is electrically connected to the controller and is controlled by the controller.

[0010] Preferably, the main bubble generating unit and the auxiliary bubble generating unit both include a bubble generator and an air outlet pipe arranged at an output end of the bubble generator.

[0011] The beneficial effect of the utility model is as follows: by setting a main bubble generating unit, a secondary bubble generating unit, a controller and a flow sensor, it can be achieved that when the flow rate of the water inlet pipe is low, the controller only controls the main bubble generating unit to work, and the bubbles generated by the main bubble generating unit are in full contact with the wastewater, so that the suspended matter in the water is removed; when the flow rate of the water inlet pipe is high, the controller controls the main bubble generating unit to work, and also controls the secondary bubble generating unit to work, when the water inlet flow rate increases, the amount of bubbles per unit time also increases, and is in full contact with the wastewater, so that the suspended matter in the wastewater is removed, thereby making the water inlet flow rate and the amount of bubbles generated per unit time reasonably correspond, ensuring economy while also ensuring the quality of wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the implementation scheme of the utility model or the technical scheme in the prior art, the drawings required for use in the implementation scheme or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation schemes of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0013] Figure 1 This is a schematic diagram of the structure of the utility model:

[0014] Figure 2 This is the front view of the utility model:

[0015] Figure 3 This is a cross-sectional view of the utility model:

[0016] Figure 4 It is a structural schematic diagram of the disk, the main bubble generating unit and the auxiliary bubble generating unit of the utility model;

[0017] Figure 5This is a schematic block diagram of the principle of controlling the main bubble generating unit and the auxiliary bubble generating unit of the utility model;

[0018] Figure 6 This is a schematic block diagram of the principle of controlling a water pump according to the utility model.

[0019] In the figure, 1, flotation area; 2, scraping area; 3, water inlet pipe; 4, flow sensor; 5, water supply pump; 6, controller; 7, main bubble generating unit; 8, secondary bubble generating unit; 9, liquid level sensor; 10, water pump; 11, water outlet pipe; 12, conveyor belt; 13, motor; 14, scraper; 15, collection box; 16, disc; 17, bubble generator; 18, air outlet pipe. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0021] Reference Figure 1-Figure 6 As shown, an air flotation machine for papermaking comprises an air flotation area 1, a foam scraping area 2 connected to the air flotation area 1, and a controller 6. The air flotation area 1 is provided with a main bubble generating unit 7 and a secondary bubble generating unit 8. The bottom of the air flotation area 1 is connected to a water supply pump 5 through a water inlet pipe 3. The water inlet pipe 3 is provided with a flow sensor 4 for detecting the water inlet flow rate. The output end of the flow sensor 4 is connected to the input end of the controller 6 for providing the controller 6 with a signal of the water inlet flow rate. The output end of the controller 6 outputs a controller 6 signal, and the control signal is used to control the operation of the main bubble generating unit 7 and the secondary bubble generating unit 8.

[0022] Specifically, Figure 1-Figure 6 As shown, the process of the air flotation machine for cleaning and purifying suspended matter in water is as follows: first, the wastewater mixed with the liquid medicine is sent to the air flotation area 1 through the water supply pump 5, and the bubble generating unit inside the air flotation area 1 (the bubble generating unit here corresponds to the main bubble generating unit 7 or the auxiliary bubble generating unit 8 hereinafter) generates bubbles attached to the surface of the suspended matter, driving the suspended matter to rise above the water surface, and then follows the water flow into the scraping area 2, and is scraped out by the scraper 14 of the scraping area 2, so as to remove the suspended matter in the water. The above is the working principle of the existing air flotation machine. When the existing air flotation machine is in operation, there is a lack of a good matching relationship between the water inlet flow of the water supply pump 5 and the bubble generating unit, which easily causes the problem of high treatment cost or poor treatment effect. Based on the above situation, the utility model sets a controller 6 and a flow sensor 4, and at the same time changes the bubble generating unit into a main bubble generating unit 7 and an auxiliary bubble generating unit 8, so as to achieve a good matching relationship between the bubble generating unit and the wastewater flow in the wastewater treatment process, such as Figure 5As shown, when wastewater enters the flotation area 1 at a relatively low flow rate through the water supply pump 5, the controller 6 only controls the main bubble generating unit 7 to work, and the bubbles generated by the main bubble generating unit 7 contact and react with the wastewater with a low flow rate. When the controller 6 receives the water flow rate detected by the flow sensor 4 as being too large, the controller 6 controls the main bubble generating unit 7 and the secondary bubble generating unit 8 to work synchronously, and a large number of bubbles contact the wastewater with a high flow rate, thereby ensuring the treatment effect of the wastewater.

[0023] Furthermore, the output end of the main bubble generating unit 7 is lower than the output end of the secondary bubble generating unit 8, and the air flotation area 1 is in a cone shape with a diameter gradually decreasing from top to bottom.

[0024] Among them, Figure 3 As shown, the flotation zone 1 is shaped like a cone, so that when the wastewater enters from the bottom of the flotation zone 1, it can come into contact with the bubbles more comprehensively. In the conventional rectangular flotation zone 1, the wastewater is easy to escape to the surroundings after entering, and cannot fully pass through the vicinity of the bubble generation position, resulting in poor treatment effect. The main bubble generating unit 7 is arranged at a lower position, so that it can fully come into contact with the wastewater with a low flow rate, so that the treatment effect is better.

[0025] Furthermore, the main bubble generating unit 7 and the secondary bubble generating unit 8 are both fixed by a disc 16 disposed above the air flotation area 1 , and there are multiple secondary bubble generating units 8 , which are evenly distributed circumferentially along the axis of the air flotation area 1 .

[0026] Among them, Figure 4 As shown, after the wastewater enters the flotation zone 1, it moves upward from the bottom. As the radius of the flotation zone 1 gradually increases, the wastewater will gradually escape to the surroundings. Therefore, the secondary bubble generating units 8 are evenly distributed circumferentially along the axis of the flotation zone 1, and can fully contact the wastewater in the rising process.

[0027] Furthermore, a water pump 10 connected through a water outlet pipe 11 is provided on one side of the scraping area 2, and a liquid level sensor 9 for detecting the water level in the scraping area 2 is also provided on the scraping area 2. The output end of the liquid level sensor 9 is connected to the controller 6 for providing the controller 6 with a water level signal of the scraping area 2. The output end of the controller 6 outputs a controller 6 signal, and the control signal is used to control the operation of the water pump 10.

[0028] Among them, Figure 3 and Figure 6As shown, in order to facilitate better scraping of the foam in the scraping area 2, it is necessary to control the water level in the scraping area 2 to keep the water level in the scraping area 2 in contact with the scraper 14. The water level control is mainly achieved through the controller 6, the liquid level sensor 9 and the water pump 10. When the liquid level sensor 9 detects that the water level is high, the controller 6 controls the water pump 10 to speed up the drainage of the foam scraping area 2 to reduce the water level. When the liquid level sensor 9 detects that the water level is low, the controller 6 controls the water pump 10 to slowly drain the foam scraping area 2 to increase the water level.

[0029] like Figure 2 and Figure 3 As shown, a conveyor belt 12 is arranged above the scraping area 2, and the conveyor belt 12 is driven by a motor 13. Scrapers 14 are arranged on the upper and lower surfaces of the conveyor belt 12. The motor 13 is electrically connected to the controller 6 and is controlled by the controller 6 for operation.

[0030] Among them, the motor 13 runs by driving the conveyor belt 12, and the conveyor belt 12 drives the scraper 14 to scrape out the floating foam in the scraping area 2, so that the floating foam containing suspended matter is concentrated and falls into the inside of the collection box 15. The running speed of the scraper 14 can be achieved by controlling the running speed of the motor 13 through the controller 6. For example, when the flow sensor 4 detects that the wastewater flow is large, the motor 13 is controlled to run at a faster speed.

[0031] like Figure 3 As shown, the main bubble generating unit 7 and the auxiliary bubble generating unit 8 both include a bubble generator 17 and an air outlet pipe 18 arranged at the output end of the bubble generator 17 .

[0032] The main bubble generating unit 7 and the auxiliary bubble generating unit 8 are both generating devices capable of generating bubbles, such as a bubble generating unit composed of a bubble generator 17 and an air outlet pipe 18. The specific bubble generator 17 may be an air compressor or an air pump.

[0033] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An air flotation machine for papermaking, comprising an air flotation zone (1), a foam scraping zone (2) connected to the air flotation zone (1), and a controller (6), characterized in that: The flotation zone (1) is provided with a main bubble generating unit (7) and a secondary bubble generating unit (8). The bottom of the flotation zone (1) is connected to a water supply pump (5) via a water inlet pipe (3). The water inlet pipe (3) is provided with a flow sensor (4) for detecting the water inlet flow rate. The output end of the flow sensor (4) is connected to the input end of a controller (6) for providing the controller (6) with a signal of the water inlet flow rate. The output end of the controller (6) outputs a control signal. The control signal is used to control the operation of the main bubble generating unit (7) and the secondary bubble generating unit (8).

2. The air flotation machine for papermaking according to claim 1, characterized in that: The output end of the main bubble generating unit (7) is lower than the output end of the secondary bubble generating unit (8), and the air flotation area (1) is in the shape of a cone whose diameter gradually decreases from top to bottom.

3. The air flotation machine for papermaking according to claim 2, characterized in that: The main bubble generating unit (7) and the secondary bubble generating unit (8) are both fixed by a disc (16) arranged above the air flotation area (1), the secondary bubble generating units (8) are multiple in number, and the multiple secondary bubble generating units (8) are evenly distributed circumferentially along the axis of the air flotation area (1).

4. The air flotation machine for papermaking according to claim 1, characterized in that: A water pump (10) connected via a water outlet pipe (11) is also provided on one side of the foam scraping area (2); a liquid level sensor (9) for detecting the water level in the foam scraping area (2) is also provided on the foam scraping area (2); an output end of the liquid level sensor (9) is connected to a controller (6) for providing the controller (6) with a water level signal of the foam scraping area (2); an output end of the controller (6) outputs a control signal, and the control signal is used to control the operation of the water pump (10).

5. The air flotation machine for papermaking according to claim 1, characterized in that: A conveyor belt (12) is arranged above the scraping area (2), the conveyor belt (12) is driven by a motor (13), scrapers (14) are arranged on the upper surface and the lower surface of the conveyor belt (12), and the motor (13) is electrically connected to a controller (6) and operates under the control of the controller (6).

6. The air flotation machine for papermaking according to claim 1, characterized in that: The main bubble generating unit (7) and the auxiliary bubble generating unit (8) both comprise a bubble generator (17) and an air outlet pipe (18) arranged at the output end of the bubble generator (17).

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