A papermaking white water recovery apparatus

Abstract

The application relates to the technical field of wastewater recovery treatment, and discloses a papermaking white water recovery equipment, which comprises a recovery tank body, the inside of the recovery tank body is provided with a recovery containing space, one side end is provided with a conical discharge end, and the other side end is provided with an opening; papermaking white water flows into the recovery tank body through the opening; a partition plate assembly is arranged on the inside of the recovery tank body and is used for separating the inside space of the recovery tank body into a negative pressure area and two air flotation areas; and a filter assembly is arranged on the inside of the recovery tank body. The papermaking white water recovery equipment aims to solve the problems that the purification precision of a filter equipment is insufficient, micro fibers and fillers and other substances cannot be completely recovered, resources are wasted, an air flotation equipment depends on a prefiltering equipment, foam is generated during operation and needs to be additionally treated, the equipment has high investment, cleaning and maintenance are complicated, human cost is high, and system operation efficiency is low.

Description

Technical Field

[0001] This invention relates to the field of wastewater recycling and treatment technology, specifically to a papermaking white water recycling device. Background Technology

[0002] The papermaking process requires a large amount of water resources. At the same time, the white water discharged from the papermaking equipment also contains a lot of materials such as fibers and fillers that are worth recycling. Therefore, in order to reduce water consumption and recycle materials, most paper mills are equipped with white water recycling equipment.

[0003] Current white water recycling methods primarily achieve solid-liquid separation and resource recovery through filtration and flotation. However, filtration equipment, limited by purification precision, cannot effectively remove tiny fibers and fillers from white water, resulting in incomplete resource recovery. While flotation equipment can improve white water cleanliness, it relies on pre-filtration equipment for operation, and the foam generated during operation requires specialized equipment for treatment, increasing equipment investment and necessitating frequent cleaning of the foam treatment device. Furthermore, both pre-filtration and flotation equipment require independent cleaning and maintenance, leading to cumbersome operations, high labor costs, and reduced operating efficiency of the white water recycling system, failing to meet the demands of industrial production for efficient and low-consumption recycling technologies. Summary of the Invention

[0004] The purpose of this invention is to address the problems of insufficient purification precision in filtration equipment, which cannot completely recover microfibers and fillers, leading to resource waste; and the problems of air flotation equipment relying on pre-filtration equipment, generating foam that requires additional treatment, resulting in high equipment investment, cumbersome cleaning and maintenance, high labor costs, and low system operating efficiency. Therefore, this invention proposes a papermaking white water recovery device.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0006] A papermaking white water recycling device, comprising:

[0007] The recycling tank has a recycling and containing space inside, and one end of the tank is provided with a conical discharge end, while the other end is open, through which papermaking white water flows into the recycling tank.

[0008] A baffle assembly is disposed inside the recycling tank and is used to divide the internal space of the recycling tank into a negative pressure area and two air flotation areas.

[0009] The filter assembly is located inside the recycling tank and is used to perform multi-stage filtration on the papermaking white water flowing into the recycling tank, intercepting fibers and impurities of different particle sizes, and allowing the filtered white water to flow into two air flotation zones.

[0010] A pressure generating component is located in the negative pressure area of ​​the recovery tank and is used to generate negative and positive pressure in the negative pressure area. The negative pressure generated by the pressure generating component is used to accelerate the filtration speed of the filtration component. The pressure generating component is connected to the air flotation component, and the positive pressure generated by the pressure generating component is used to inject microbubbles into the white water that has undergone multi-stage filtration in the two air flotation areas, so that small particles, fibers, fillers and other impurities adhere to the bubbles and float to the surface to form a foam layer.

[0011] A foam collection assembly is located inside the recycling tank and connected to the negative pressure area. The negative pressure generated by the pressure generating assembly is used to collect and transfer the foam layer to the negative pressure area.

[0012] The sedimented impurities in the flotation area flow into the negative pressure area, and the sedimented impurities and foam layer in the negative pressure area are discharged from the recovery tank through the discharge end. The white water in the flotation area after impurity removal is discharged from the recovery tank for recycling.

[0013] Based on the above technical solution, the present invention can be further improved as follows.

[0014] Furthermore, the partition assembly includes:

[0015] A transverse baffle is fixedly installed inside the recycling tank, forming the negative pressure area by enclosing the conical discharge end of the lower half of the recycling tank.

[0016] A sealed container is fixedly installed on the side of the transverse partition away from the negative pressure area, forming a sealed chamber inside it;

[0017] Two vertical partitions are fixedly installed on the outside of the sealed container, and together with the horizontal partition and the sealed container, they divide the upper part of the recovery tank into two air flotation zones.

[0018] Furthermore, the filtering component includes:

[0019] A guide plate is fixedly installed inside the recycling tank. Its upper surface is used to receive the flowing papermaking white water. The surface of the guide plate has several arc-shaped through holes. The arc-shaped through holes are divided into two groups, which are symmetrically distributed around the axis of the guide plate and are not connected to each other.

[0020] A forward and reverse drive motor is located at the axial center of the recycling tank, and its output end is connected to a drive shaft. The drive shaft passes through the guide plate and the sealed container in sequence and extends into the negative pressure area.

[0021] The actuating component is fixedly sleeved on the outside of the drive shaft. Two sets of agitating rods are provided on the side of the component near the guide plate. The number and distribution of the agitating rods correspond to the arc-shaped through holes and extend into the two sets of arc-shaped through holes respectively.

[0022] The first filter screen is fixedly installed inside the recycling tank and located below the guide plate;

[0023] A water collector is fixedly installed inside the recovery tank. It is recessed downward near the axis to form a filtered water outlet area. The filtered water outlet area is connected to at least two first solenoid valves, and the water outlet of each first solenoid valve corresponds to one of the air flotation areas.

[0024] Furthermore, the pressure generating component includes:

[0025] A polygonal prism is fitted onto the end of the drive shaft away from the forward and reverse drive motors, and its cross-section is polygonal.

[0026] A pressure cylinder is fixedly installed in the negative pressure area inside the recovery tank, and the polygonal prism passes through the pressure cylinder and is rotatably connected to its axis.

[0027] A piston unit is disposed within the pressure cylinder and is movable along its inner wall;

[0028] The guide groove is located at the end of the polygonal prism away from the drive shaft and consists of interconnected spiral groove segments and cylindrical groove segments.

[0029] The transmission screw is connected at one end to the piston unit and at the other end to the spiral groove section.

[0030] A rubber plug is disposed at the end of the transmission screw and located within the cylindrical groove section;

[0031] The negative pressure pipeline has its outlet end connected to the cylindrical groove section, and an air inlet check valve is provided on the negative pressure pipeline.

[0032] A positive pressure pipeline, the inlet end of which is connected to the cylindrical groove section, is provided with an outlet one-way valve, the outlet end of which extends into the sealed container;

[0033] The pressure transmission pipeline has one end connected to the negative pressure area and the other end extending between the first filter screen and the water collector;

[0034] The rubber plug moves back and forth within the cylindrical groove section with the transmission screw, drawing out the gas in the negative pressure area through the negative pressure pipeline to form a negative pressure, and then transporting the gas to the sealed container through the positive pressure pipeline to form a positive pressure; the negative pressure in the negative pressure area acts between the first filter screen and the water collector through the pressure transmission pipeline, accelerating the passage of white water through the first filter screen.

[0035] Furthermore, at least four gas release seats located inside the sealed container are fixedly installed on the outer peripheral wall of the drive shaft. Each gas release seat is connected to an annular distribution hose. The outlet end of the positive pressure pipeline is connected to the annular distribution hose. The sealed container is also connected to a pressure relief pipeline. The other end of the pressure relief pipeline extends to the outside of the recovery tank and is equipped with a pressure relief valve.

[0036] Furthermore, an annular filter element is fitted around the pressure cylinder and the inlet end of the negative pressure pipeline within the negative pressure area of ​​the recovery tank. A water supply pipeline is provided on the pressure cylinder, with one end extending into the sealed container. A water outlet hole is opened on the surface of the piston unit, and a second filter screen is installed inside the water outlet hole, with an opening and closing flap hinged thereto. An electromagnetic adsorption device is provided inside the water outlet hole, which magnetically engages with the opening and closing flap. Several axial guide rods are also provided inside the pressure cylinder, and the piston unit passes through the guide rods and can move along their axial direction.

[0037] Furthermore, the air flotation assembly includes:

[0038] There are two second solenoid valves, which are respectively connected to the sealed container and the two air flotation areas;

[0039] The number of flow guide pipes corresponds to the number of the second solenoid valves, with its inlet end connected to the second solenoid valve and its outlet end being closed.

[0040] Several microbubble releasers are provided, each divided into two groups, and are respectively installed on the two guide pipes to release microbubbles into the air flotation area.

[0041] Furthermore, the foam collection assembly includes:

[0042] Two electric sliding tables are vertically fixed on the surface of the sealed container and parallel to its axis, and are respectively set in the two air flotation areas;

[0043] An arc-shaped negative pressure seat is connected to the output end of the electric slide table and can be moved to the surface of the filtered white water under the drive of the electric slide table. The surface of the arc-shaped negative pressure seat away from the opening end of the recovery tank is provided with a liquid level detection infrared sensor.

[0044] The air extraction and drainage tube is connected at one end to the arc-shaped negative pressure seat and at the other end to the pressure transmission pipeline. A third solenoid valve is provided on the air extraction and drainage tube.

[0045] Furthermore, the transverse partition is provided with a drain channel that corresponds to and communicates with the two air flotation areas. The drain channel is equipped with a fourth solenoid valve. The drain channel is also connected to a drain pipe that extends to the outside of the recovery tank. The drain pipe is equipped with a fifth solenoid valve.

[0046] Furthermore, the drain pipe is equipped with a filter backwashing assembly, which includes:

[0047] The pump body is located outside the recovery tank, and its inlet end is connected to the discharge pipeline through a suction pipeline.

[0048] The liquid outlet pipeline has its inlet end connected to the outlet end of the pump body, and the outlet end extends to the area between the first filter screen and the water collector.

[0049] A slag discharge pipe is installed through the guide plate, and the outlet end of the slag discharge pipe extends into the negative pressure area of ​​the recovery tank. A sixth solenoid valve is also provided on the slag discharge pipe.

[0050] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0051] This invention utilizes a recycling tank as the overall processing container. Its conical discharge end facilitates the concentrated discharge of impurities, while the open design allows for the inflow of white water. A baffle assembly divides the recycling tank into a negative pressure zone and two flotation zones, providing space for subsequent processing. A filtration assembly performs multi-stage filtration of the incoming papermaking white water within the recycling tank, effectively trapping fibers and impurities of different particle sizes. A pressure generating assembly is located in the negative pressure zone, generating negative pressure that works in conjunction with the filtration assembly to accelerate filtration. The generated positive pressure is connected to the flotation assembly, injecting microbubbles into the filtered white water in the flotation zone. This causes small particles of fiber, filler, and other impurities to adhere and float to the surface, forming a foam layer. This replaces the reliance on pre-filtration equipment in traditional flotation systems, reducing equipment investment. A foam collection assembly is connected to the pressure generating assembly, using negative pressure to collect and transfer the foam layer to the negative pressure zone, where it is discharged along with the sedimented impurities flowing in from the flotation zone through the discharge end. All components work together to integrate filtration, flotation, foam collection, and impurity discharge functions into one unit, simplifying maintenance, reducing labor costs, and improving the operational efficiency of the white water recycling system. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the overall connection structure of the present invention;

[0053] Figure 2 This is a schematic diagram of the connection structure from another perspective of the present invention;

[0054] Figure 3 This is a schematic diagram of the connection structure between the recovery tank and the pressure relief pipeline of the present invention;

[0055] Figure 4 This is a schematic diagram of the internal cross-sectional connection structure of the recycling tank of the present invention;

[0056] Figure 5 This is a schematic diagram of the connection structure between the recycling tank and the baffle assembly of the present invention;

[0057] Figure 6 This is a schematic diagram of the connection structure between the recycling tank and part of the filter assembly of the present invention;

[0058] Figure 7 This is a schematic diagram of the connection structure between the recycling tank and the foam collection assembly of the present invention;

[0059] Figure 8 This is a schematic diagram of the connection structure between the partition assembly and the air flotation assembly of the present invention;

[0060] Figure 9 This is a schematic diagram of the connection structure between the sealing container and the drive shaft of the present invention;

[0061] Figure 10 This is a schematic diagram of the connection structure between the annular filter element and the pressure cylinder of the present invention;

[0062] Figure 11 This is a schematic diagram of the connection structure of some pressure generating components of the present invention;

[0063] Figure 12 This is a schematic diagram of the connection structure between the transmission screw and the piston unit of the present invention;

[0064] Figure 13 For the present invention Figure 12 Enlarged view of point A in the middle;

[0065] Figure 14 This is a schematic diagram of the connection structure between the water collector and the first solenoid valve of the present invention.

[0066] In the diagram: 1. Recycling tank; 2. Baffle assembly; 21. Horizontal baffle; 22. Sealed container; 23. Vertical baffle; 3. Filter assembly; 31. Guide plate; 32. Arc-shaped through hole; 33. Forward and reverse drive motor; 34. Drive shaft; 35. Actuating element; 36. Stirring rod; 37. First filter screen; 38. Water collector; 39. First solenoid valve; 4. Pressure generating assembly; 41. Polyhedral prism; 42. Pressure cylinder; 43. Piston unit; 44. Guide groove; 45. Transmission screw; 46. Rubber plug; 47. Negative pressure pipeline; 48. Positive pressure pipeline; 49. Pressure transmission pipeline; 5. Air flotation assembly; 51. 52. Second solenoid valve; 53. Flow guide pipe; 6. Microbubble releaser; 7. Foam collection assembly; 8. Electric slide table; 9. Arc-shaped negative pressure seat; 10. Liquid level detection infrared sensor; 11. Air extraction pipe; 12. Gas release seat; 13. Annular distribution hose; 14. Pressure relief pipe; 15. Annular filter element; 16. Water supply pipe; 17. Water outlet hole; 18. Second filter screen; 19. Opening and closing flap; 10. Electromagnetic adsorption device; 11. Drainage channel; 12. Drainage pipe; 13. Filter backwashing assembly; 184. Pump body; 185. Suction pipe; 186. Liquid outlet pipe; 187. Slag discharge pipe. Detailed Implementation

[0067] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0068] Combination Figures 1-14 As shown, a papermaking white water recycling device of the present invention includes:

[0069] The recycling tank 1 has a recycling and holding space inside, and a conical discharge end is provided on one side end, which is also equipped with a plug. The other side end is open, and the white water from papermaking flows into the recycling tank 1 through the opening.

[0070] The baffle assembly 2 is located inside the recycling tank 1 and is used to divide the internal space of the recycling tank 1 into a negative pressure area and two air flotation areas.

[0071] The filter assembly 3 is located inside the recycling tank 1 and is used to perform multi-stage filtration on the papermaking white water flowing into the recycling tank 1, intercepting fibers and impurities of different particle sizes, and allowing the filtered white water to flow into two air flotation zones.

[0072] Pressure generating component 4 is located in the negative pressure area of ​​the recovery tank 1 and is used to generate negative and positive pressure in the negative pressure area. The negative pressure generated by pressure generating component 4 is used to accelerate the filtration speed of filter component 3. Pressure generating component 4 is connected to air flotation component 5. The positive pressure generated by pressure generating component 4 is used to inject microbubbles into the white water that has undergone multi-stage filtration in the two air flotation areas so that small particles, fibers, fillers and other impurities adhere to the bubbles and float to form a foam layer.

[0073] Foam collection component 6 is located inside the recycling tank 1 and is connected to the negative pressure area. The negative pressure generated by pressure generating component 4 is used to collect and transfer the foam layer to the negative pressure area.

[0074] The sedimented impurities in the flotation area flow into the negative pressure area. The sedimented impurities and foam layer in the negative pressure area are discharged from the discharge end to the recovery tank 1. The white water in the flotation area after impurity removal is discharged from the recovery tank 1 for recycling.

[0075] When the papermaking white water recovery equipment is working, the papermaking white water flows into its internal recovery and containment space through the opening of the recovery tank 1. The baffle assembly 2 inside the recovery tank 1 divides the tank space into a negative pressure zone and two air flotation zones, defining functional spaces for subsequent processing. Then, the flowing papermaking white water enters the filter assembly 3, where fibers and impurities of different particle sizes are effectively intercepted through multi-stage filtration. The filtered white water then flows into the air flotation zones on both sides. At this time, the pressure generating assembly 4 located in the negative pressure zone starts to work, and the negative pressure it generates acts on the filter assembly 3, accelerating the white water filtration speed. At the same time, the positive pressure generated by the pressure generating assembly 4 interacts with the air flotation assembly 5. Connected to the air flotation zone, microbubbles are injected into the filtered white water, causing small particles, fibers, fillers, and other impurities to adhere to the bubbles and float to the surface, forming a foam layer. The foam collection component 6 is connected to the negative pressure zone, and the negative pressure generated in the negative pressure zone collects and transfers the foam layer formed in the air flotation zone to the negative pressure zone. Meanwhile, the impurities that settle in the air flotation zone also naturally flow into the negative pressure zone. Finally, the sedimented impurities and foam layer in the negative pressure zone are discharged from the tank through the conical discharge end at the end of the recovery tank 1. The white water that has been purified in the air flotation zone is discharged from the recovery tank 1, realizing recycling and reuse, and completing the entire papermaking white water recycling process.

[0076] In a preferred embodiment, the present invention may be further configured as follows: Figure 4 , Figure 8 As shown; the partition assembly 2 includes:

[0077] A transverse baffle 21 is fixedly installed inside the recycling tank 1, forming a negative pressure area with the conical discharge end of the lower half of the recycling tank 1;

[0078] A sealed container 22 is fixedly installed on the side of the transverse partition 21 away from the negative pressure area, forming a sealed chamber inside. The sealed container 22 is also provided with a dispensing port.

[0079] Two vertical baffles 23 are fixedly installed on the outside of the sealed container 22. Together with the horizontal baffle 21 and the sealed container 22, they divide the upper part of the recovery tank 1 into two air flotation zones. The horizontal baffle 21 and the conical discharge end of the lower part of the recovery tank 1 enclose a negative pressure zone, providing working space for the pressure generating component 4. This allows negative and positive pressure to be generated within the negative pressure zone. The sealed chamber formed by the sealed container 22 ensures the stability of the internal structure and provides an installation base for the vertical baffles 23, enhancing the overall structural strength of the baffle assembly 2. The two vertical baffles 23, together with the horizontal baffle 21 and the sealed container 22, divide the upper part of the recovery tank 1 into two air flotation zones. This allows the white water filtered by the filter assembly 3 to flow in evenly. Under the positive pressure generated by the pressure generating component 4, the air flotation process can be stably carried out in both air flotation zones, allowing small particles, fibers, fillers, and other impurities to fully adhere to the microbubbles and float to the surface to form a foam layer, thus improving the efficiency of air flotation impurity removal.

[0080] In a preferred embodiment, the present invention may be further configured as follows: Figure 2 , Figure 6 As shown; filter component 3 includes:

[0081] The guide plate 31 is fixedly installed inside the recycling tank 1. Its upper surface is used to receive the flowing papermaking white water. The surface of the guide plate 31 is provided with several arc-shaped through holes 32. The arc-shaped through holes 32 are divided into two groups, which are symmetrically distributed around the axis of the guide plate 31 and are not connected to each other.

[0082] The forward and reverse drive motor 33 is located at the axial center of the recovery tank 1, and its output end is connected to the drive shaft 34. The drive shaft 34 passes through the guide plate 31 and the sealed container 22 in sequence and extends into the negative pressure area.

[0083] The actuating element 35 is fixedly sleeved on the outside of the drive shaft 34. Two sets of agitating rods 36 are provided on the side of the agitating element 35 near the guide plate 31. The number and distribution of the agitating rods 36 correspond to the arc-shaped through holes 32, and they extend into the two sets of arc-shaped through holes 32 respectively.

[0084] The first filter screen 37 is fixedly installed inside the recycling tank 1 and located below the guide plate 31;

[0085] The water collector 38 is fixedly installed inside the recovery tank 1. Its area near the axis is recessed to form a filtered water outlet zone. This zone is connected to at least two first solenoid valves 39, each with its outlet corresponding to a flotation area. White water discharged from the papermaking equipment is transported via a pipeline system to the upper surface of the guide plate 31. The forward and reverse drive motor 33 drives the drive shaft 34 to rotate, causing the actuating element 35, fixedly sleeved on the outside of the drive shaft 34, and the stirring rod 36 to reciprocate forward and reverse within the arc-shaped through-hole 32. As the stirring rod 36 moves along the arc-shaped through-hole 32, the larger fibers in the white water are contained within the hole's diameter. Impurities cannot pass through, and the periodic movement of the stirring rod 36 continuously pushes impurities away from the arc-shaped through holes 32, ensuring that the multiple arc-shaped through holes 32 remain unobstructed. This allows the white water to quickly pass through the arc-shaped through holes 32 and fall onto the first filter screen 37 below. The first filter screen 37 performs secondary filtration on the white water, further trapping impurities such as fibers. After two filtrations, the white water falls into the filtered water outlet area of ​​the water collector 38. The filtered water outlet area of ​​the water collector 38 is connected to the first solenoid valve 39, which accurately discharges the treated white water to the corresponding air flotation area according to the working requirements, providing white water with higher purity for the subsequent air flotation impurity removal process.

[0086] In a preferred embodiment, the present invention may be further configured as follows: Figure 9 , Figure 10 and Figure 11 As shown; the pressure generating component 4 includes:

[0087] A polygonal prism 41 is fitted onto the end of the drive shaft 34 away from the forward and reverse drive motors 33, and its cross-section is polygonal.

[0088] The pressure cylinder 42 is fixedly installed in the negative pressure area inside the recovery tank 1. The polygonal prism 41 passes through the pressure cylinder 42 and is rotatably connected to its axis. The pressure cylinder 42 is also connected to a water inlet check valve.

[0089] Piston unit 43 is disposed inside pressure cylinder 42 and can be displaced along its inner wall;

[0090] The guide groove 44 is located at the end of the polygonal prism 41 away from the drive shaft 34, and is composed of interconnected spiral groove segments and cylindrical groove segments.

[0091] The transmission screw 45 is connected to the piston unit 43 at one end and is threaded into the spiral groove section at the other end.

[0092] A rubber plug 46 is disposed at the end of the transmission screw 45 and located within the cylindrical groove section;

[0093] The negative pressure pipeline 47 has its outlet end connected to the cylindrical groove section, and an air inlet check valve is provided on the negative pressure pipeline 47.

[0094] Positive pressure pipeline 48, its inlet end is connected to the cylindrical groove section, and a one-way valve for venting is provided on positive pressure pipeline 48, and its outlet end extends into the sealed container 22.

[0095] The pressure transmission pipeline 49 has one end connected to the negative pressure area and the other end extended between the first filter screen 37 and the water collector 38.

[0096] The rubber plug 46 moves back and forth within the cylindrical groove section along with the transmission screw 45. It draws out gas from the negative pressure area through the negative pressure pipeline 47 to form negative pressure, and then transports the gas to the sealed container 22 through the positive pressure pipeline 48 to form positive pressure. The negative pressure in the negative pressure area acts between the first filter screen 37 and the water collector 38 through the pressure transmission pipeline 49, accelerating the passage of white water through the first filter screen 37. A polygonal prism groove is formed on the end of the drive shaft 34 away from the forward and reverse drive motor 33. The polygonal prism 41 is interference-fitted into the inner side of the polygonal prism groove; this arrangement facilitates subsequent removal. A sealed bearing is fitted on the outer side of the pressure cylinder 42, embedded at the shaft center of the pressure cylinder 42. When the pressure generating component 4 is working, the drive shaft 34 rotates forward and reverse under the drive of the forward and reverse drive motor 33, synchronously driving the polygonal prism 41 fitted at its end to rotate. The spiral groove section and the cylindrical groove section in the polygonal prism 41 rotate accordingly. The spiral groove section is threadedly engaged with the drive screw 45. During the rotation of the polygonal prism 41, the drive screw 45 reciprocates up and down along the inner wall of the pressure cylinder 42, thereby driving the rubber plug 46 to move up and down synchronously within the cylindrical groove section. When the rubber plug 46 rises in the cylindrical groove section, the gas in the cylindrical groove section is compressed and is directionally transported to the sealed container 22 through the one-way valve on the positive pressure pipeline 48, forming positive pressure. This positive pressure is converted into microbubbles by the air flotation component 5 and injected into the air flotation area, causing small particles, fibers, fillers, and other impurities to adhere and float to form a foam layer. When the rubber plug 46 moves down in the cylindrical groove section, the gas in the negative pressure area is drawn into the cylindrical groove section through the one-way valve on the negative pressure pipeline 47, forming negative pressure in the negative pressure area. This negative pressure is transmitted through the pressure transmission pipeline 49 to the space between the first filter screen 37 and the water collector 38, generating suction on the white water passing through the first filter screen 37 and accelerating the white water filtration speed.

[0097] In a preferred embodiment, the present invention may be further configured as follows: Figure 7 , Figure 9As shown; at least four gas release seats 7 are fixedly installed on the outer peripheral wall of the drive shaft 34, located inside the sealed container 22. Each gas release seat 7 is connected to an annular distribution hose 8. The outlet end of the positive pressure pipeline 48 is also connected to the annular distribution hose 8. The sealed container 22 is also connected to a pressure relief pipeline 9. The other end of the pressure relief pipeline 9 extends to the outside of the recovery tank 1 and is equipped with a pressure relief valve. The gas generated by the pressure generating component 4 through the positive pressure pipeline 48 is evenly distributed by the annular distribution hose 8 to the multiple gas release seats 7 fixedly installed on the outer peripheral wall of the drive shaft 34. The gas release seats 7 inject the gas into the sealed container in the form of tiny bubbles. In the water in container 22, the water is enriched with gas. This gas-rich water then flows into the flotation zone. Under pressure changes, microbubbles carry small particles, fibers, fillers, and other impurities to the surface, forming a foam layer. This effectively removes fine impurities that are difficult to filter in white water. At the same time, the pressure relief pipe 9 and pressure relief valve connected to the sealed container 22 play an important role in ensuring stability. When the air pressure inside the sealed container 22 is too high, excess gas is discharged in time through the pressure relief pipe 9 and pressure relief valve, maintaining the pressure stability inside the sealed container 22. This ensures the stability and continuity of the microbubble generation and injection process, and avoids the air flotation impurity removal effect being affected by abnormal pressure.

[0098] In a preferred embodiment, the present invention may be further configured as follows: Figure 12 , Figure 13As shown; within the negative pressure area of ​​the recovery tank 1, an annular filter element 10 is fitted outside the pressure cylinder 42 and the inlet end of the negative pressure pipeline 47. A water supply pipeline 11 is provided on the pressure cylinder 42, with one end extending into the sealed container 22. A water outlet hole 12 is opened on the surface of the piston unit 43, and a second filter screen 13 is installed inside the water outlet hole 12, with a hinged opening / closing flap 14. An electromagnetic adsorption device 15 is provided inside the water outlet hole 12, magnetically engaging with the opening / closing flap 14. Several axial guide rods are also provided inside the pressure cylinder 42, and the piston unit 43 passes through these guide rods and can move axially. When the negative pressure pipeline 47 generates negative pressure within the negative pressure area to draw in gas, the annular filter element 10 performs its filtering function, blocking foam layers, fibers, and impurities from entering the negative pressure pipeline 47 and causing blockage, ensuring smooth negative pressure generation. The reciprocating motion of the transmission screw 45 drives the piston unit 43 to vertically displace. When the piston unit 43 moves upward, the electromagnetic adsorption device 15 is energized, which adsorbs and seals the water outlet hole 12 by the opening and closing flap 14, creating a negative pressure around the pressure cylinder 42. At this time, the papermaking white water is drawn into the cylinder through the water inlet check valve on the pressure cylinder 42. The annular filter element 10 ensures that only water can enter and impurities are blocked outside. When the piston unit 43 moves downward, the electromagnetic adsorption device 15 is de-energized, and the piston unit 43 presses down, causing the water in the cylinder to pass through the second filter screen 13 and push the opening and closing flap 14 to flow into the area above the piston unit 43. As the piston unit 43 moves continuously, the water in the negative pressure area is gradually collected above the piston unit 43. When the piston unit 43 moves upward again, the water in the cylinder is injected into the sealed container 22 through the water replenishment pipe 11 to replenish the water volume in the sealed container 22 and mix with the high-pressure gas in it, making the water rich in gas, providing conditions for the generation of microbubbles and the formation of a foam layer by adhering impurities in the subsequent air flotation area.

[0099] In a preferred embodiment, the present invention may be further configured as follows: Figure 6 , Figure 8 As shown; the air flotation component 5 includes:

[0100] The second solenoid valve 51, there are two of them, which are respectively connected to the sealed container 22 and the two air flotation areas;

[0101] The number of flow guide pipes 52 corresponds to the number of second solenoid valves 51. Its inlet end is connected to the second solenoid valve 51, and its outlet end is closed.

[0102] Several microbubble releasers 53 are evenly divided into two groups and are respectively set on two guide pipes 52. They are used to release microbubbles into the air flotation area. When the air flotation component 5 is running, the gas-rich water in the sealed container 22 is driven by the second solenoid valve 51 and enters the guide pipe 52 through the second solenoid valve 51. The guide pipe 52 transports the water to the microbubble releasers 53 distributed thereon. The microbubble releasers 53 convert the gas-rich water into microbubbles and release them into the air flotation area. At the same time, the flocculant agent pre-added through the inlet on the sealed container 22 causes the small particles of fiber, filler and other impurities in the white water to undergo a flocculation reaction. After the microbubbles are generated, these flocculated impurities can quickly attach to the surface of the bubbles. As the microbubbles continue to rise, the impurities attached to them float to the surface of the liquid and gradually form a bubble layer.

[0103] In a preferred embodiment, the present invention may be further configured as follows: Figure 6 , Figure 7 As shown; the foam collection component 6 includes:

[0104] Two electric sliding tables 61 are vertically fixed on the surface of the sealed container 22 and parallel to its axis, and are respectively set in the two air flotation areas;

[0105] The arc-shaped negative pressure seat 62 is connected to the output end of the electric slide table 61 and can be moved to the surface of the filtered white water under the drive of the electric slide table 61. The surface of the arc-shaped negative pressure seat 62 away from the opening end of the recovery tank 1 is provided with a liquid level detection infrared sensor 63.

[0106] The suction pipe 64 is connected at one end to the arc-shaped negative pressure seat 62 and at the other end to the pressure transmission pipeline 49. A third solenoid valve is installed on the suction pipe 64. After the air flotation process is completed, the white water in the air flotation area of ​​the recovery tank 1 is allowed to settle and separate into layers. Foam floats on the upper layer, while heavier impurities such as silt settle above the transverse baffle 21. At this time, the foam collection component 6 starts to work. The electric slide 61 drives the arc-shaped negative pressure seat 62 to move down. The liquid level detection infrared sensor 63 monitors the liquid level in real time to ensure that the arc-shaped negative pressure seat 62 moves accurately to the surface of the filtered white water and the third solenoid valve on the suction pipe 64 is turned on. The negative pressure generated by the pressure generating component 4 in the negative pressure area is transmitted to the arc-shaped negative pressure seat 62 through the pressure transmission pipe 49 and the air extraction pipe 64. The arc-shaped negative pressure seat 62, with its negative pressure adsorption capacity, draws the foam layer along with a small amount of filtered white water into its interior. Then, it is transported to the negative pressure area through the air extraction pipe 64 and the pressure transmission pipe 49, achieving the concentrated accumulation of foam impurities. The small amount of white water drawn in during the process can flow back into the pressure cylinder 42 to participate in the circulation treatment. This not only efficiently completes the foam collection task and avoids foam residue affecting the quality of white water recycling, but also realizes the secondary utilization of water resources and reduces waste.

[0107] In a preferred embodiment, the present invention may be further configured as follows: Figure 1 , Figure 7 As shown; a drain channel 16 is provided through the transverse partition 21, corresponding to the two air flotation zones. A fourth solenoid valve is installed on the drain channel 16. The drain channel 16 is also connected to a drain pipe 17 extending to the outside of the recovery tank 1. A fifth solenoid valve is installed on the drain pipe 17. During the papermaking white water recovery process, after the white water in the air flotation zone has completed impurity separation and settling, the drain channel 16 and related components on the transverse partition 21 play a crucial role. First, the fourth solenoid valve is opened, and then the fifth solenoid valve is closed. At this time, the sediment on the transverse partition 21... Heavier impurities such as silt and sand on tank 1 are smoothly discharged into the negative pressure area through the drainage channel 16, which is connected to the flotation area, under the action of gravity. This achieves centralized collection and discharge of impurities, avoiding the impact of impurity residue on the subsequent white water recovery quality. After the heavier impurities are completely discharged, the fourth solenoid valve is closed and the fifth solenoid valve is opened. The clean white water, after being filtered by the multi-stage filtration component 3, impurity removal by the flotation component 5, and foam layer removal by the foam collection component 6, is discharged out of the recovery tank 1 through the drainage channel 16 and the drainage pipeline 17, thus completing the efficient recovery of papermaking white water.

[0108] In a preferred embodiment, the present invention may be further configured as follows: Figure 1 , Figure 5 As shown; a filter backwashing assembly 18 is provided on the drain pipe 17, and the filter backwashing assembly 18 includes:

[0109] Pump body 181 is located outside the recovery tank 1, and its inlet end is connected to the drain pipe 17 through suction pipe 182.

[0110] The liquid outlet pipe 183 has its inlet end connected to the outlet end of the pump body 181, and its outlet end extends to the area between the first filter screen 37 and the water collector 38.

[0111] The slag discharge pipe 184 is installed through the guide plate 31. The outlet end of the slag discharge pipe 184 extends into the negative pressure area of ​​the recovery tank 1. The slag discharge pipe 184 is also equipped with a sixth solenoid valve. After the papermaking white water recovery equipment has been used for a period of time, the filter backwashing component 18 starts the maintenance program, closes the fourth solenoid valve, opens the fifth solenoid valve, and the pump 181 starts to work. It draws the purified white water in the air flotation area through the suction pipe 182, and then transports it through the liquid outlet pipe 183 to the area between the first filter screen 37 and the water collector 38. At this time, the first solenoid valve 39 is closed and the sixth solenoid valve is opened. As the water volume in the water collector 38 continues to increase, the water flows in the reverse direction and passes through the first filter screen 37 and the arc-shaped through hole 32 on the guide plate 31 in sequence. During the process, the impurities intercepted on the first filter screen 37 are washed off, and the water flow also carries the large particles of impurities on the guide plate 31 into the slag discharge pipe 184. The impurities on the first filter screen 37 and the guide plate 31 are then discharged into the negative pressure area of ​​the recovery tank 1 through the slag discharge pipe 184 and the sixth solenoid valve, achieving unified collection of fibers and impurities. After that, the plug at the conical discharge end of the recovery tank 1 is removed, and the impurities in the negative pressure area can be discharged. When discharging mud, sand and larger fibers and impurities, some of the water flowing into the negative pressure area is recycled and reused by the negative pressure generated by the pressure cylinder 42, avoiding waste of water resources. In addition, after removing the plug, the annular filter element 10 can be taken out and the impurities attached to its surface can be cleaned, effectively maintaining the filtration performance of each component of the equipment.

[0112] The specific working principle of the papermaking white water recycling equipment of the present invention is as follows:

[0113] When using this papermaking white water recycling equipment, the white water discharged from the papermaking equipment is first introduced into the internal recycling space of the recycling tank 1 through the opening end. The white water falls on the upper surface of the guide plate 31. The forward and reverse drive motor 33 is started to drive the drive shaft 34 to rotate, so that the stirring rod 36 on the agitator 35 reciprocates in the arc-shaped through hole 32, intercepting larger fibers and impurities and pushing them away from the through hole. After passing through the arc-shaped through hole 32, the white water is filtered twice by the first filter screen 37 and falls into the filtered water outlet area of ​​the water collector 38. It is discharged into the two air flotation areas by the control of the first solenoid valve 39. At the same time, the drive shaft 34 drives the polygonal prism 41 to rotate, and the transmission screw 45 causes the rubber plug 46 to move back and forth in the cylindrical groove section. When the rubber plug 46 rises, gas is injected into the sealed container 22 through the positive pressure pipeline 48. When it falls, negative pressure is formed in the negative pressure area through the negative pressure pipeline 47. The negative pressure accelerates the filtration speed of the first filter screen 37 through the pressure transmission pipeline 49.

[0114] The reciprocating motion of the transmission screw 45 drives the piston unit 43 to move vertically. When the piston unit 43 moves upward, the electromagnetic adsorption device 15 is energized, which adsorbs and seals the water outlet hole 12 by the opening and closing flap 14, forming a negative pressure around the pressure cylinder 42. At this time, the papermaking white water is drawn into the cylinder through the water inlet check valve on the pressure cylinder 42. The annular filter element 10 ensures that only water can enter and impurities are blocked outside. When the piston unit 43 moves downward, the electromagnetic adsorption device 15 is de-energized, and the piston unit 43 presses down, causing the water in the cylinder to pass through the second filter screen 13 and push the opening and closing flap 14 to flow into the area above the piston unit 43. As the piston unit 43 moves continuously, the water in the negative pressure area is gradually collected above the piston unit 43. When the piston unit 43 moves upward again, the water in the cylinder is injected into the sealed container 22 through the water replenishment pipe 11 to replenish the water volume in the sealed container 22.

[0115] Inside the sealed container 22, gas is injected into the water in the form of microbubbles from the gas release seat 7 via the annular distribution hose 8. The flocculant added through the inlet promotes the flocculation of small particulate impurities. After the white water flows into the air flotation area, the second solenoid valve 51 is opened. The gas-rich water is released through the guide pipe 52 by the microbubble releaser 53, causing the flocculated impurities to attach to the bubbles and float to form a foam layer.

[0116] After the air flotation is completed, the electric slide 61 drives the arc-shaped negative pressure seat 62 to the liquid surface, and opens the air extraction pipe 64 through the third solenoid valve. The negative pressure is used to draw the foam layer into the negative pressure area. At the same time, the sediment in the air flotation area flows into the negative pressure area through the drain channel 16. At this time, the fourth solenoid valve is closed and the fifth solenoid valve is opened. The clean white water is discharged and recycled through the drain pipe 17.

[0117] After the equipment has been running for a period of time, the filter backwashing component 18 is started. The pump body 181 pumps the purified white water between the first filter screen 37 and the water collector 38 to backwash the first filter screen 37 and the guide plate 31. Impurities are discharged into the negative pressure area through the slag discharge pipe 184. Finally, the conical discharge end plug is removed to discharge the impurities. At the same time, the annular filter element 10 can be removed for cleaning. During this period, the water flowing into the negative pressure area is recycled and reused by the pressure cylinder body 42 to ensure the continuous and efficient operation of the equipment.

[0118] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0119] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A papermaking white water recycling device, characterized in that, include: The recycling tank (1) has a recycling and containing space inside, and a conical discharge end is provided on one side end, while the other side end is open. Papermaking white water flows into the recycling tank (1) through the opening. The partition assembly (2) is located inside the recycling tank (1) and is used to divide the internal space of the recycling tank (1) into a negative pressure area and two air flotation areas. The partition assembly (2) includes: a horizontal partition (21), which is fixedly installed inside the recycling tank (1) and surrounds the conical discharge end of the lower half of the recycling tank (1) to form the negative pressure area; a sealed container (22), which is fixedly installed on the side surface of the horizontal partition (21) away from the negative pressure area and forms a sealed chamber inside; and two vertical partitions (23), which are fixedly installed on the outside of the sealed container (22) respectively, and cooperate with the horizontal partition (21) and the sealed container (22) to divide the upper half of the recycling tank (1) into two air flotation areas. The filter assembly (3) is located inside the recycling tank (1) and is used to perform multi-stage filtration on the papermaking white water flowing into the recycling tank (1), intercepting fibers and impurities of different particle sizes, and allowing the filtered white water to flow into two air flotation zones. The filter assembly (3) includes: a guide plate (31), which is fixedly installed inside the recycling tank (1), and its upper surface is used to receive the incoming papermaking white water. The surface of the guide plate (31) is provided with a number of arc-shaped through holes (32). The arc-shaped through holes (32) are divided into two groups, which are symmetrically distributed around the axis of the guide plate (31) and are not connected to each other; a forward and reverse drive motor (33), which is set at the axis of the recycling tank (1), and its output end is connected to a drive shaft (34). The drive shaft (34) passes through the guide plate (31) and the sealed container (22) in sequence and extends into the negative pressure area. A toggle element (35) is fixedly sleeved on the outside of the drive shaft (34). Two sets of stirring rods (36) are provided on the side of the toggle plate (31). The number and distribution of the stirring rods (36) correspond to the arc-shaped through holes (32) and extend into the two sets of arc-shaped through holes (32) respectively. A first filter screen (37) is fixedly installed inside the recycling tank (1) and located below the toggle plate (31). The water collector (38) is fixedly installed inside the recycling tank (1). It is recessed near the axis to form a filtered water outlet area. The filtered water outlet area is connected to at least two first solenoid valves (39). The water outlet of each first solenoid valve (39) corresponds to one of the air flotation areas. The pressure generating component (4) is located in the negative pressure area of ​​the recovery tank (1) and is used to generate negative and positive pressure in the negative pressure area. The negative pressure generated by the pressure generating component (4) is used to accelerate the filtration speed of the filter component (3). The pressure generating component (4) is connected to the air flotation component (5). The positive pressure generated by the pressure generating component (4) is used to inject microbubbles into the white water that has undergone multi-stage filtration in the two air flotation areas so that small particles, fibers, fillers and other impurities adhere to the bubbles and float to form a foam layer. A foam collection component (6) is located inside the recycling tank (1) and connected to the negative pressure area. The negative pressure generated by the pressure generating component (4) is used to collect and transfer the foam layer to the negative pressure area. The sedimented impurities in the air flotation area flow into the negative pressure area, and the sedimented impurities and foam layer in the negative pressure area are discharged from the recycling tank (1) through the discharge end. The white water in the air flotation area after impurity removal is discharged from the recycling tank (1) for recycling.

2. The papermaking white water recycling equipment according to claim 1, characterized in that, The pressure generating component (4) includes: A polygonal prism (41) is fitted onto the end of the drive shaft (34) away from the forward and reverse drive motor (33), and its cross-section is polygonal; The pressure cylinder (42) is fixedly installed in the negative pressure area inside the recycling tank (1), and the polygonal prism (41) passes through the pressure cylinder (42) and is rotatably connected to its axis. Piston unit (43) is disposed inside the pressure cylinder (42) and can be displaced along its inner wall; The guide groove (44) is located at one end of the polygonal prism (41) away from the drive shaft (34) and is composed of interconnected spiral groove segments and cylindrical groove segments; The transmission screw (45) is connected at one end to the piston unit (43) and at the other end to the spiral groove section. A rubber plug (46) is disposed at the end of the transmission screw (45) and located within the cylindrical groove section; The negative pressure pipeline (47) has its outlet end connected to the cylindrical groove section, and the negative pressure pipeline (47) is equipped with an air inlet check valve; A positive pressure pipeline (48) is provided with an inlet end connected to the cylindrical groove section. The positive pressure pipeline (48) is equipped with an outlet check valve, and its outlet end extends into the sealed container (22). The pressure transmission pipeline (49) has one end connected to the negative pressure area and the other end extended between the first filter screen (37) and the water collector (38); The rubber plug (46) moves back and forth in the cylindrical groove section with the transmission screw (45), and draws out the gas in the negative pressure area through the negative pressure pipeline (47) to form a negative pressure, and transports the gas to the sealed container (22) through the positive pressure pipeline (48) to form a positive pressure; the negative pressure in the negative pressure area acts between the first filter screen (37) and the water collector (38) through the pressure transmission pipeline (49), accelerating the passage of white water through the first filter screen (37).

3. The papermaking white water recycling equipment according to claim 2, characterized in that, At least four gas release seats (7) located inside the sealed container (22) are fixedly installed on the outer peripheral wall of the drive shaft (34). Each gas release seat (7) is connected to an annular distribution hose (8). The outlet end of the positive pressure pipeline (48) is connected to the annular distribution hose (8). The sealed container (22) is also connected to a pressure relief pipeline (9). The other end of the pressure relief pipeline (9) extends to the outside of the recovery tank (1) and is equipped with a pressure relief valve.

4. The papermaking white water recycling equipment according to claim 2, characterized in that, An annular filter element (10) is fitted on the outside of the pressure cylinder (42) and the inlet end of the negative pressure pipeline (47) in the negative pressure area of ​​the recycling tank (1). A water supply pipeline (11) is provided on the pressure cylinder (42), one end of which extends into the sealed container (22). A water outlet hole (12) is opened on the surface of the piston unit (43). A second filter screen (13) is installed in the water outlet hole (12) and a hinged opening and closing flap (14) is connected to it. An electromagnetic adsorption device (15) is provided on the inside of the water outlet hole (12) and magnetically engages with the opening and closing flap (14). Several axial guide rods are also provided on the inside of the pressure cylinder (42). The piston unit (43) passes through the guide rods and can move along their axial direction.

5. The papermaking white water recycling equipment according to claim 1, characterized in that, The air flotation component (5) includes: There are two second solenoid valves (51), which are respectively connected to the sealed container (22) and the two air flotation areas; The number of flow guide pipes (52) corresponds to the number of the second solenoid valves (51), and their inlet end is connected to the second solenoid valves (51), while their outlet end is closed. Microbubble releasers (53) are numerous and divided into two groups, respectively set on the two guide pipes (52), for releasing microbubbles into the air flotation area.

6. The papermaking white water recycling equipment according to claim 2, characterized in that, The foam collection component (6) includes: Two electric sliding tables (61) are vertically fixed on the surface of the sealed container (22) and parallel to its axis, and are respectively set in the two air flotation areas; The arc-shaped negative pressure seat (62) is connected to the output end of the electric slide (61) and can be moved to the surface of the filtered white water under the drive of the electric slide (61). The surface of the arc-shaped negative pressure seat (62) away from the opening end of the recovery tank (1) is provided with a liquid level detection infrared sensor (63). The suction tube (64) is connected at one end to the arc-shaped negative pressure seat (62) and at the other end to the pressure transmission pipeline (49). A third solenoid valve is provided on the suction tube (64).

7. The papermaking white water recycling equipment according to claim 1, characterized in that, The transverse partition (21) is provided with a drain channel (16) that is connected to the two air flotation areas. The drain channel (16) is provided with a fourth solenoid valve. The drain channel (16) is also connected to a drain pipe (17) that extends to the outside of the recovery tank (1). The drain pipe (17) is provided with a fifth solenoid valve.

8. The papermaking white water recycling equipment according to claim 7, characterized in that, The drain pipe (17) is equipped with a filter backwashing assembly (18), which includes: The pump body (181) is located outside the recovery tank (1), and its inlet end is connected to the discharge pipe (17) through the suction pipe (182); The outlet pipe (183) has its inlet end connected to the outlet end of the pump body (181), and the outlet end extends to the area between the first filter screen (37) and the water collector (38). A slag discharge pipe (184) is installed through the guide plate (31). The outlet end of the slag discharge pipe (184) extends into the negative pressure area of ​​the recovery tank (1). A sixth solenoid valve is also provided on the slag discharge pipe (184).

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