Papermaking white water recovery equipment

Abstract

The invention relates to the technical field of waste water recovery treatment, and discloses papermaking white water recovery equipment which comprises a recovery tank body, the interior of the recovery tank body is provided with a recovery containing space, the end part of one side of the recovery tank body is provided with a conical discharge end, the end part of the other side of the recovery tank body is provided with an opening, and papermaking white water flows into the recovery tank body through the opening; the partition plate assembly is arranged on the inner side of the recovery tank body and is used for dividing the internal space of the recovery tank body into a negative pressure area and two air flotation areas; and the filtering assembly is arranged on the inner side of the recycling tank body. The papermaking white water recovery equipment aims at solving the problems that the purification precision of filtering equipment is insufficient, substances such as micro fibers and filler cannot be completely recovered, and resources are wasted; the problems of high labor cost and low system operation efficiency due to the fact that air floatation equipment depends on front filtering equipment, foam generated during operation needs to be additionally treated, equipment investment is large, cleaning and maintenance are tedious are solved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater recovery and treatment, in particular to papermaking white water recovery equipment. Background Art

[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 fibers, fillers and other materials worth recycling. Therefore, in order to reduce the use of water resources and recycle materials, most paper mills are equipped with white water recovery equipment.

[0003] Existing whitewater recovery and treatment primarily achieves solid-liquid separation and resource recovery through filtration and flotation. However, filtration equipment is limited by its purification accuracy and cannot effectively remove substances such as tiny fibers and fillers in whitewater, resulting in incomplete resource recovery. While flotation equipment can improve whitewater cleanliness, it relies on the coordinated operation of pre-filtration equipment, and the foam generated during operation requires specialized equipment to handle it, which not only increases equipment investment but also requires frequent cleaning of the foam treatment device. Furthermore, both pre-filtration equipment and flotation equipment require independent cleaning and maintenance. This dual maintenance process results in cumbersome operations, consumes significant labor costs, and reduces the operating efficiency of the whitewater recovery system, making it difficult to meet the demand for high-efficiency, low-cost recovery technologies in industrial production. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of insufficient purification accuracy of filtration equipment, which cannot completely recover substances such as tiny fibers and fillers, resulting in waste of resources; and the problem that flotation equipment relies on pre-filtration equipment, and the foam generated during operation requires additional treatment, resulting in large equipment investment, cumbersome cleaning and maintenance, high labor costs and low system operating efficiency. A papermaking white water recovery device is proposed.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A papermaking white water recovery device, comprising: The recovery tank body has a recovery accommodating space inside, and a conical discharge end is provided at one end thereof, and an opening is provided at the other end thereof, and papermaking white water flows into the recovery tank body through the opening; A partition assembly is provided inside the recovery tank body, and is used to separate the internal space of the recovery tank body into a negative pressure area and two air flotation areas; A filter assembly is provided inside the recovery tank body, and is used to perform multi-stage filtration on the papermaking white water flowing into the recovery tank body, intercept fibers and impurities of different particle sizes, and allow the filtered white water to flow into two flotation areas; A pressure generating assembly is disposed in the negative pressure region of the recovery tank body and is used to generate negative and positive pressures within the negative pressure region; the negative pressure generated by the pressure generating assembly is used to accelerate the filtration speed of the filter assembly; the pressure generating assembly is connected to the air flotation assembly, and the positive pressure generated by the pressure generating assembly is used to inject tiny bubbles into the white water that has undergone multi-stage filtration in the two air flotation regions, so that impurities such as small particle fibers and fillers adhere to the bubbles and float to form a foam layer; A foam collecting assembly is provided inside the recovery tank and is in communication with the negative pressure region, wherein the negative pressure generated by the pressure generating assembly is used to collect and transfer the foam layer to the negative pressure region; The precipitated impurities in the flotation area flow into the negative pressure area, the precipitated impurities and the foam layer in the negative pressure area are discharged from the recovery tank through the discharge end, and the white water in the flotation area after impurities removal is discharged from the recovery tank for recycling.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the partition assembly includes: A transverse partition is fixedly installed in the recovery tank body and encloses the conical discharge end of the lower half of the recovery tank body to form the negative pressure area; A sealed container is fixedly mounted on a surface of the transverse partition away from the negative pressure area, and forms a sealed chamber inside the container; There are two vertical partitions, which are fixedly installed on the outside of the sealed container respectively, and cooperate with the horizontal partition and the sealed container to divide the upper half area of ​​the recovery tank into two flotation areas.

[0008] Furthermore, the filtering component includes: A guide plate is fixedly mounted on the inner side of the recovery tank, and its upper surface is used to receive the inflowing papermaking white water. The surface of the guide plate is provided with a plurality of arc-shaped through holes, and the arc-shaped through holes are divided into two groups, which are symmetrically distributed with the axis of the guide plate as the center and are not connected to each other; A forward and reverse drive motor is arranged at the axis center of the recovery tank, and its output end is connected to a drive shaft, which sequentially passes through the guide plate and the sealed container and extends into the negative pressure area; A toggle member is fixedly sleeved on the outside of the drive shaft, and two groups of stirring rods are provided on the side of the toggle member close to the guide plate. The number and distribution of the stirring rods correspond to the arc-shaped through holes, and the stirring rods extend into the two groups of arc-shaped through holes respectively; A first filter screen is fixedly arranged inside the recovery tank and below the guide plate; The water collector is fixedly arranged inside the recovery tank body, and is concave 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 end of each first solenoid valve corresponds to one of the flotation areas.

[0009] Furthermore, the pressure generating component includes: A polygonal column, sleeved on the end of the drive shaft away from the forward and reverse drive motor, with a polygonal cross section; The pressure cylinder is fixedly arranged in the negative pressure area inside the recovery tank, and the polygonal column passes through the pressure cylinder and is rotatably connected to the axis thereof; A piston unit is disposed in the pressure cylinder and is displaceable along the inner wall thereof; A guide groove is provided at one end of the polygonal column away from the drive shaft and is composed of a spiral groove section and a cylindrical groove section that are interconnected; A transmission screw, one end of which is connected to the piston unit and the other end of which is threadedly engaged with the spiral groove segment; a rubber plug, disposed at the end of the transmission screw and located in the cylindrical groove section; A negative pressure pipeline, the outlet end of which is connected to the cylindrical groove section, and an air intake check valve is provided on the negative pressure pipeline; A positive pressure pipeline, the inlet end of which is in communication with the cylindrical groove section, the positive pressure pipeline is provided with an air outlet one-way valve, and the outlet end of which extends into the sealed container; a pressure transmission pipeline, one end of which is in communication with the negative pressure area and the other end of which extends between the first filter screen and the water collector; The rubber stopper moves back and forth in the cylindrical groove section along with the transmission screw, and the gas in the negative pressure area is extracted through the negative pressure pipeline to form negative pressure, and the gas is transported to the sealed container through the positive pressure pipeline to form 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 white water to pass through the first filter screen.

[0010] Furthermore, at least four gas release seats located in the sealed container are fixedly provided on the outer peripheral wall of the drive shaft, and the gas release seats are all connected to the 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, and the other end of the pressure relief pipeline extends to the outside of the recovery tank and is provided with a pressure relief valve.

[0011] Furthermore, an annular filter is provided on the outside of the pressure cylinder body and the inlet end of the negative pressure pipeline in the negative pressure area of ​​the recovery tank body, and a water supply pipeline is provided on the pressure cylinder body, one end of which extends into the sealed container. A water outlet hole is provided on the surface of the piston unit, and a second filter screen is installed in the water outlet hole, and an opening and closing flap is hingedly connected thereto; an electromagnetic adsorption device is provided on the inside of the water outlet hole, which is magnetically matched with the opening and closing flap, and a number of axial guide rods are also provided on the inside of the pressure cylinder body. The piston unit is inserted into the guide rod and can move axially along it.

[0012] Furthermore, the air flotation component includes: There are two second solenoid valves, which are connected to the sealed container and the two flotation areas respectively; The number of the diversion pipelines corresponds to the number of the second solenoid valves, the inlet ends of the diversion pipelines are connected to the second solenoid valves, and the outlet ends of the diversion pipelines are closed; There are a plurality of microbubble releasers which are evenly divided into two groups and are respectively arranged on the two guide pipes for releasing microbubbles into the flotation area.

[0013] Furthermore, the foam collection assembly includes: Two electric slides are fixed vertically on the surface of the sealed container and parallel to its axis, and are respectively arranged in the two air flotation areas; An arc-shaped negative pressure seat is connected to the output end of the electric slide and can be moved to the level of the filtered white water under the drive of the electric slide. A liquid level detection infrared sensor is provided on the surface of the arc-shaped negative pressure seat away from the opening end of the recovery tank body; An air extraction and drainage tube has one end connected to the arc-shaped negative pressure seat and the other end connected to the pressure transmission pipeline. A third solenoid valve is provided on the air extraction and drainage tube.

[0014] Furthermore, a drainage channel corresponding to the two flotation areas is provided through the transverse partition, and a fourth solenoid valve is provided on the drainage channel. The drainage channel is also connected to a drainage pipeline extending to the outside of the recovery tank body, and a fifth solenoid valve is provided on the drainage pipeline.

[0015] Furthermore, a filter backwash component is provided on the drainage pipeline, and the filter backwash component includes: A pump body is arranged outside the recovery tank body, and its inlet end is connected with the discharge pipeline through a suction pipeline; a liquid outlet pipeline, the inlet end of which is connected to the outlet end of the pump body, and the outlet end of which extends to the area between the first filter screen and the water collector; A slag discharge pipe is provided on the guide plate, wherein the outlet end of the slag discharge pipe extends into the negative pressure area of ​​the recovery tank body, and a sixth solenoid valve is further provided on the slag discharge pipe.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: The present invention uses a recovery tank as an integral processing container. Its tapered discharge end facilitates the centralized discharge of impurities, while the open design facilitates the inflow of white water. A partition assembly divides the recovery tank into a negative pressure area and two flotation areas, providing a spatial foundation for subsequent processing. The filter assembly performs multi-stage filtration on the incoming papermaking white water within the recovery tank, effectively intercepting fibers and impurities of different particle sizes. A pressure generating assembly is disposed in the negative pressure area. The negative pressure generated cooperates with the filter assembly to accelerate the filtration speed. The positive pressure generated is connected to the flotation assembly, injecting tiny bubbles into the filtered white water in the flotation area, causing small particles of fiber, filler, and other impurities to adhere and float to form a foam layer. This replaces the reliance of traditional flotation equipment on pre-filtration equipment, reducing equipment investment. A foam collection assembly is connected to the pressure generating assembly, utilizing negative pressure to collect and transfer the foam layer to the negative pressure area. The foam layer is then discharged through the discharge end together with precipitated impurities flowing into the flotation area. The components cooperate with each other to integrate the functions of filtration, flotation, foam collection, and impurity discharge, simplifying maintenance procedures, reducing labor costs, and improving the operating efficiency of the white water recovery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall connection structure of the present invention; Figure 2 A schematic diagram of the connection structure of another perspective of the present invention; Figure 3 This is a schematic diagram of the connection structure between the recovery tank and the pressure relief pipeline of the present invention; Figure 4 This is a schematic diagram of the internal cross-sectional connection structure of the recovery tank of the present invention; Figure 5 This is a schematic diagram of the connection structure between the recovery tank and the partition assembly of the present invention; Figure 6 This is a schematic diagram of the connection structure between the recovery tank and part of the filtering component of the present invention; Figure 7 This is a schematic diagram of the connection structure between the partial recovery tank and the foam collection assembly of the present invention; Figure 8 This is a schematic diagram of the connection structure between the baffle assembly and the air flotation assembly of the present invention; Figure 9 This is a schematic diagram of the connection structure between a partially sealed container and a drive shaft of the present invention; Figure 10 This is a schematic diagram of the connection structure between the annular filter element and the pressure cylinder body of the present invention; Figure 11 This is a schematic diagram of the connection structure of some pressure generating components of the present invention; Figure 12 Schematic diagram of the connection structure between the transmission screw and the piston unit of the present invention; Figure 13 For the present invention Figure 12 Enlarged view of point A in the middle; Figure 14 It is a schematic diagram of the connection structure between the water collector and the first solenoid valve of the present invention.

[0018] In the figure: 1. Recovery tank; 2. Partition assembly; 21. Horizontal partition; 22. Sealed container; 23. Vertical partition; 3. Filter assembly; 31. Guide plate; 32. Arc-shaped through hole; 33. Forward and reverse drive motor; 34. Drive shaft; 35. Toggle member; 36. Stirring rod; 37. First filter screen; 38. Water collector; 39. First solenoid valve; 4. Pressure generating assembly; 41. Polygonal prism; 42. Pressure cylinder; 43. Piston unit; 44. Guide groove; 45. Drive screw; 46. Rubber stopper; 47. Negative pressure pipeline; 48. Positive pressure pipeline; 49. Pressure transmission pipeline; 5. Air flotation assembly; 51 , second solenoid valve; 52, diversion pipeline; 53, microbubble releaser; 6, foam collection assembly; 61, electric slide; 62, arc-shaped negative pressure seat; 63, liquid level detection infrared sensor; 64, exhaust drainage pipe; 7, gas release seat; 8, annular distribution hose; 9, pressure relief pipeline; 10, annular filter element; 11, water supply pipeline; 12, water outlet hole; 13, second filter screen; 14, opening and closing flap; 15, electromagnetic adsorption device; 16, drainage channel; 17, drainage pipeline; 18, filter backwash assembly; 181, pump body; 182, suction pipeline; 183, liquid outlet pipeline; 184, slag discharge pipeline. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Combine Figures 1-14 As shown, a papermaking white water recovery device of the present invention comprises: The recovery tank body 1 has a recovery and accommodating space inside, and a conical discharge end is provided at one end thereof, and a plug is also provided on the conical discharge end. The other end thereof is open, and the papermaking white water flows into the recovery tank body 1 through the opening; The partition assembly 2 is provided inside the recovery tank 1 and is used to separate the internal space of the recovery tank 1 into a negative pressure area and two flotation areas; The filter assembly 3 is provided inside the recovery tank 1 and is used to perform multi-stage filtration on the papermaking white water flowing into the recovery tank 1, intercepting fibers and impurities of different particle sizes, and allowing the filtered white water to flow into two flotation areas; The pressure generating assembly 4 is disposed within the negative pressure region of the recovery tank 1 and is used to generate both negative and positive pressure within the negative pressure region. The negative pressure generated by the pressure generating assembly 4 is used to accelerate the filtration speed of the filter assembly 3. The pressure generating assembly 4 is connected to the flotation assembly 5. The positive pressure generated by the pressure generating assembly 4 is used to inject tiny bubbles into the white water that has undergone multi-stage filtration in the two flotation regions, so that small particles of fiber, fillers, and other impurities adhere to the bubbles and float upward to form a foam layer. The foam collecting assembly 6 is provided inside the recovery tank 1 and is connected to the negative pressure area. The negative pressure generated by the pressure generating assembly 4 is used to collect and transfer the foam layer to the negative pressure area. The precipitated impurities in the flotation area flow into the negative pressure area, and the precipitated impurities and foam layer in the negative pressure area are discharged from the recovery tank 1 through the discharge end. The white water after impurity removal in the flotation area is discharged from the recovery tank 1 for recycling.

[0021] When the papermaking white water recovery equipment is working, the papermaking white water flows into the internal recovery and holding space of the recovery tank body 1 through the open end thereof. The partition assembly 2 in the recovery tank body 1 separates the tank body space into a negative pressure area and two flotation areas, dividing the functional space for subsequent processing. Then, the inflowing papermaking white water enters the filter assembly 3. Through multi-stage filtration, fibers and impurities of different particle sizes are effectively intercepted, and the filtered white water flows into the flotation areas on both sides. At this time, the pressure generating assembly 4 located in the negative pressure area starts to work, and the negative pressure it generates acts on the filter assembly 3 to accelerate the white water filtration speed; at the same time, the positive pressure generated by the pressure generating assembly 4 and the flotation assembly 5 The filter element 6 is connected to the negative pressure area, and tiny bubbles are injected into the filtered white water in the flotation area, so that small particle fibers, fillers and other impurities adhere to the bubbles and float up to form a foam layer. The foam collection component 6 is connected to the negative pressure area, and with the help of the negative pressure generated by the negative pressure area, the foam layer formed in the flotation area is collected and transferred to the negative pressure area, and the impurities settled in the flotation area also naturally flow into the negative pressure area. Finally, the precipitated impurities and foam layer in the negative pressure area are discharged from the tank body through the conical discharge end at the end of the recovery tank body 1; the white water after impurity removal in the flotation area is discharged from the recovery tank body 1 to achieve recycling and reuse, completing the entire papermaking white water recovery and treatment process.

[0022] In a preferred embodiment, the present invention can be further configured as follows: Figure 4 、 Figure 8 As shown; the partition assembly 2 includes: The transverse partition 21 is fixedly installed in the recovery tank 1 and encloses the conical discharge end of the lower half of the recovery tank 1 to form a negative pressure area; The sealed container 22 is fixedly mounted on the side surface of the transverse partition 21 away from the negative pressure area, and a sealed chamber is formed inside the sealed container 22. The sealed container 22 is also provided with a feeding port; There are two vertical partitions 23, which are fixedly installed on the outside of the sealed container 22, and cooperate with the horizontal partition 21 and the sealed container 22 to divide the upper half of the recovery tank body 1 into two flotation areas. The horizontal partition 21 and the conical discharge end of the lower half of the recovery tank body 1 are enclosed to form a negative pressure area, providing a working space for the pressure generating component 4, so that negative pressure and positive pressure can be generated in the negative pressure area. The sealed chamber formed by the sealed container 22 ensures the stability of the internal structure, provides an installation basis for the vertical partition 23, and enhances the overall structural strength of the partition assembly 2. The two vertical partitions 23 cooperate with the horizontal partition 21 and the sealed container 22 to divide the upper half of the recovery tank body 1 into two flotation areas, so that the white water filtered by the filter assembly 3 flows evenly. Under the action of the positive pressure generated by the pressure generating component 4, the flotation process can be carried out stably in the two flotation areas, allowing small particle fibers, fillers and other impurities to fully adhere to tiny bubbles and float to form a foam layer, thereby improving the flotation removal efficiency.

[0023] In a preferred embodiment, the present invention can be further configured as follows: Figure 2 、 Figure 6 As shown; the filter component 3 includes: The guide plate 31 is fixedly mounted on the inner side of the recovery tank 1. Its upper surface is used to receive the inflowing papermaking white water. The surface of the guide plate 31 is provided with a plurality of arc-shaped through holes 32. The arc-shaped through holes 32 are divided into two groups, symmetrically distributed around the axis of the guide plate 31 and not connected to each other. The forward and reverse drive motor 33 is arranged at the axis center of the recovery tank 1, and its output end is connected to the drive shaft 34, which passes through the guide plate 31 and the sealed container 22 in sequence and extends into the negative pressure area; The toggle member 35 is fixedly mounted on the outside of the drive shaft 34. Two sets of stirring rods 36 are provided on the side of the toggle member 35 close to the guide plate 31. The number and distribution of the stirring rods 36 correspond to the arc-shaped through holes 32, and the stirring rods 36 extend into the two sets of arc-shaped through holes 32 respectively. The first filter 37 is fixedly arranged inside the recovery tank 1 and below the guide plate 31; The water collector 38 is fixedly arranged on the inner side of the recovery tank body 1. It is concave 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 39. The water outlet end of each first solenoid valve 39 corresponds to an air flotation area. The white water discharged from the papermaking equipment is transported to the upper surface of the guide plate 31 through the pipeline system. The forward and reverse drive motor 33 drives the drive shaft 34 to rotate, so that the toggle member 35 fixedly sleeved on the outside of the drive shaft 34 and the stirring rod 36 reciprocate forward and reverse in the arc through hole 32. During the movement of the stirring rod 36 along the arc through hole 32, the aperture limit of the arc through hole 32 is utilized to remove larger fibers in the white water. and impurities cannot pass through. At the same time, 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 are always unobstructed, prompting the white water to quickly pass through the arc-shaped through holes 32 and fall on the first filter screen 37 below. The first filter screen 37 performs a secondary filtration on the white water to further intercept impurities such as fibers therein. The white water after two filtrations falls into the filtered water outlet area of ​​the water collector 38. The first solenoid valve 39 connected to the filtered water outlet area of ​​the water collector 38 accurately discharges the treated white water to the corresponding flotation area according to work requirements, providing white water with higher purity for the subsequent flotation impurity removal process.

[0024] In a preferred embodiment, the present invention can be further configured as follows: Figure 9 、 Figure 10 and Figure 11 As shown; the pressure generating assembly 4 includes: The polygonal column 41 is sleeved on 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 arranged in the negative pressure area inside the recovery tank 1. The polygonal column 41 passes through the pressure cylinder 42 and is rotatably connected to the axis thereof. The pressure cylinder 42 is also connected to a water inlet check valve. The piston unit 43 is disposed in the pressure cylinder 42 and can move along the inner wall thereof; The guide groove 44 is formed at the end of the polygonal column 41 away from the drive shaft 34 and is composed of a spiral groove section and a cylindrical groove section that are interconnected; A transmission screw 45, one end of which is connected to the piston unit 43 and the other end of which is threadedly engaged with the spiral groove segment; A rubber plug 46 is provided at the end of the transmission screw 45 and is located in the cylindrical groove section; The negative pressure pipeline 47 has an outlet end connected to the cylindrical groove section, and an air intake check valve is provided on the negative pressure pipeline 47; A positive pressure line 48, whose inlet end is connected to the cylindrical groove section, is provided with an outlet check valve, and whose outlet end extends into the sealed container 22; A pressure transmission line 49, one end of which is connected to the negative pressure area and the other end of which extends between the first filter 37 and the water collector 38; The rubber stopper 46 moves back and forth in the cylindrical groove section along with the transmission screw 45, and the gas in the negative pressure area is extracted through the negative pressure pipeline 47 to form negative pressure, and the gas is transported 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 white water to pass through the first filter screen 37, and the driving shaft 34 is provided with a polygonal groove at the end away from the forward and reverse driving motor 33. The polygonal prism 41 is connected to the inner side of the polygonal groove with an interference fit, so as to facilitate subsequent removal; the outer side of the pressure cylinder body 42 is provided with a sealed bearing, which is embedded in the axis center of the pressure cylinder body 42. When the pressure generating component 4 is working, the driving shaft 34 is driven by the forward and reverse driving motor 33 to rotate forward and reverse, and synchronously drives the polygonal prism 41 sleeved on its end to rotate, and the spiral groove section and cylindrical groove section in the polygonal prism 41 rotate accordingly. The spiral groove section is threadedly matched with the transmission screw 45. During the rotation of the polygonal prism 41, the transmission screw 45 reciprocates up and down along the inner wall of the pressure cylinder body 42, thereby driving the rubber plug 46 to move up and down synchronously in the cylindrical groove section. When the rubber plug 46 rises in the cylindrical groove section, the gas in the cylindrical groove section is squeezed and directed into the sealed container 22 through the air outlet one-way valve on the positive pressure pipeline 48, forming a positive pressure. The positive pressure is converted into tiny bubbles by the flotation component 5 and injected into the flotation area, causing small particles of fiber, filler and other impurities to adhere and float to form a foam layer; when the rubber plug 46 moves downward in the cylindrical groove section, the gas in the negative pressure area is drawn into the cylindrical groove section through the air inlet one-way valve on the negative pressure pipeline 47, so that negative pressure is formed in the negative pressure area. This negative pressure is transmitted to between the first filter screen 37 and the water collector 38 through the pressure transmission pipeline 49, generating suction on the white water passing through the first filter screen 37, thereby accelerating the white water filtration speed.

[0025] In a preferred embodiment, the present invention can be further configured as follows: Figure 7 、 Figure 9As shown; at least four gas release seats 7 located in the sealed container 22 are fixedly provided on the outer peripheral wall of the drive shaft 34, and the gas release seats 7 are all connected to the 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 provided with a pressure relief valve. The gas generated by the pressure generating component 4 through the positive pressure pipeline 48 is evenly distributed to the multiple gas release seats 7 fixed on the outer peripheral wall of the drive shaft 34 through the annular distribution hose 8. The gas release seats 7 inject the gas into the sealed container in the form of tiny bubbles. The water in the container 22 is enriched with gas, and the gas-rich water subsequently flows into the flotation area. Under pressure changes, tiny bubbles carry small particle fibers, fillers and other impurities to float to form a foam layer, effectively removing small impurities that are difficult to filter in the white water. At the same time, the pressure relief pipe 9 and the pressure relief valve connected to the sealed container 22 play an important role in protection. When the air pressure in the sealed container 22 is too high, the excess gas is discharged in time through the pressure relief pipe 9 and the pressure relief valve to maintain the pressure in the sealed container 22 stable, ensure the stability and continuity of the tiny bubble generation and injection process, and avoid affecting the flotation impurity removal effect due to pressure abnormalities.

[0026] In a preferred embodiment, the present invention can be further configured as follows: Figure 12 、 Figure 13As shown; in the negative pressure area of ​​the recovery tank body 1, an annular filter element 10 is sleeved on the outside of the pressure cylinder body 42 and the inlet end of the negative pressure pipeline 47, and a water supply pipeline 11 is provided on the pressure cylinder body 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, and a second filter screen 13 is installed in the water outlet hole 12, and an opening and closing flap 14 is hingedly connected; an electromagnetic adsorption device 15 is provided on the inner side of the water outlet hole 12 to magnetically cooperate with the opening and closing flap 14, and a plurality of axial guide rods are also provided on the inside of the pressure cylinder body 42. The piston unit 43 is penetrated by the guide rod and can move along the axial direction thereof. When the negative pressure pipeline 47 generates negative pressure in the negative pressure area to absorb gas, the annular filter element 10 plays a filtering role, blocking the foam layer, fiber and impurities from entering the negative pressure pipeline 47 and causing blockage, thereby ensuring a smooth negative pressure generation process. 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, and the opening and closing flap 14 is adsorbed and sealed to form a negative pressure around the pressure cylinder body 42. At this time, the papermaking white water is sucked into the cylinder through the water inlet one-way valve on the pressure cylinder body 42. The annular filter element 10 ensures that only water can enter and impurities are intercepted outside. When the piston unit 43 moves downward, the electromagnetic adsorption device 15 is de-energized, and the piston unit 43 is pressed downward to allow the water in the cylinder to pass through the second filter screen 13, pushing the opening and closing flap 14 to flow into the top of the piston unit 43. As the piston unit 43 continues to move, 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 supply pipe 11, replenishing the water in the sealed container 22 and mixing with the high-pressure gas therein, so that the water is rich in gas, providing conditions for the subsequent flotation area to generate tiny bubbles and attach impurities to form a foam layer.

[0027] In a preferred embodiment, the present invention can be further configured as follows: Figure 6 、 Figure 8 As shown; the air flotation component 5 includes: There are two second solenoid valves 51, which are connected to the sealed container 22 and the two flotation areas respectively; The number of the diversion pipes 52 corresponds to the number of the second solenoid valves 51 , the inlet ends of the diversion pipes 52 are connected to the second solenoid valves 51 , and the outlet ends of the diversion pipes 52 are closed; There are a number of microbubble releasers 53, which are evenly divided into two groups and are respectively arranged on the two diversion pipes 52 to release microbubbles into the flotation area. When the flotation component 5 is in operation, by connecting the second solenoid valve 51, the gas-rich water in the sealed container 22 is driven by pressure to enter the diversion pipe 52 through the second solenoid valve 51. The diversion pipe 52 conveys the water flow to the microbubble releasers 53 distributed thereon. The microbubble releasers 53 convert the gas-rich water into microbubbles and release them into the flotation area. At the same time, the flocculant agent pre-injected through the injection port on the sealed container 22 promotes the flocculation reaction of small particles of fiber, filler and other impurities in the white water. After the microbubbles are generated, these flocculated impurities can quickly adhere to the surface of the bubbles. As the microbubbles continue to rise, the impurities attached to them float to the liquid surface together, gradually forming a bubble layer.

[0028] In a preferred embodiment, the present invention can be further configured as follows: Figure 6 、 Figure 7 As shown; the foam collection assembly 6 includes: There are two electric slides 61, which are fixed vertically on the surface of the sealed container 22 and parallel to its axis, and are respectively arranged 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 level 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 air extraction and drainage pipe 64 is connected to the arc-shaped negative pressure seat 62 at one end and to the pressure transmission pipe 49 at the other end. A third solenoid valve is provided on the air extraction and drainage pipe 64. After the flotation process is completed, the white water in the flotation area of ​​the recovery tank 1 is allowed to stand and stratify, the foam floats on the upper layer, and the heavier impurities such as mud and sand are deposited above the transverse partition 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 downward, and 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 liquid level of the filtered white water, and the third solenoid valve on the air extraction and drainage pipe 64 is turned on. The negative pressure in the negative pressure area is generated by the pressure generating component 4, which is transmitted to the arc-shaped negative pressure seat 62 through the pressure transmission pipeline 49 and the air extraction and drainage pipe 64. The arc-shaped negative pressure seat 62 relies on its negative pressure adsorption capacity to suck the foam layer together with a small amount of filtered white water into the interior, and then transports it to the negative pressure area through the air extraction and drainage pipe 64 and the pressure transmission pipeline 49, so as to realize the concentrated accumulation of foam impurities. The small amount of white water sucked in during the process can flow back to the pressure cylinder body 42 to participate in the circulation treatment, which not only efficiently completes the foam collection task and avoids the influence of foam residue on the quality of white water recovery, but also realizes the secondary utilization of water resources and reduces waste.

[0029] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 、 Figure 7As shown; The transverse partition 21 is provided with a drainage channel 16 corresponding to the two flotation areas, and the drainage channel 16 is provided with a fourth solenoid valve. The drainage channel 16 is also connected to a drainage pipe 17 extending to the outside of the recovery tank 1, and the drainage pipe 17 is provided with a fifth solenoid valve. In the papermaking white water recovery process, when the white water in the flotation area completes the impurity separation and static stratification, the drainage channel 16 and related components on the transverse partition 21 play a key role. First, open the fourth solenoid valve and close the fifth solenoid valve. At this time, the water deposited on the transverse partition 2 The heavier impurities such as mud and sand on 1 flow smoothly into the negative pressure area through the drainage channel 16 corresponding to the flotation area under the action of gravity, thereby realizing the centralized collection and discharge of impurities and preventing the residual impurities from affecting the quality of subsequent white water recovery. When the heavier impurities are completely discharged, the fourth solenoid valve is closed and the fifth solenoid valve is opened. The clean white water after multi-stage filtration by the filter component 3, impurity removal by the flotation component 5 and removal of the foam layer by the foam collection component 6 is discharged out of the recovery tank 1 through the drainage channel 16 and the drainage pipeline 17, thereby completing the efficient recovery of papermaking white water.

[0030] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 、 Figure 5 As shown; a filter backwash component 18 is provided on the discharge pipe 17, and the filter backwash component 18 includes: The pump body 181 is arranged outside the recovery tank body 1, and its inlet end is connected to the discharge pipeline 17 through the suction pipeline 182; The liquid outlet pipe 183 has an inlet end connected to the outlet end of the pump body 181 and an outlet end extending to the area between the first filter screen 37 and the water collector 38; The slag discharge pipe 184 is provided on the guide plate 31, and the outlet end of the slag discharge pipe 184 extends to the negative pressure area of ​​the recovery tank 1. The slag discharge pipe 184 is also provided with a sixth solenoid valve. After the papermaking white water recovery equipment has been used for a period of time, the filter backwash component 18 starts the maintenance program, closes the fourth solenoid valve, opens the fifth solenoid valve, and the pump body 181 starts to work, and the purified white water in the flotation area is drawn in through the suction pipe 182, and then transported to the area between the first filter screen 37 and the water collector 38 through the liquid outlet pipe 183. 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 reverse and passes through the first filter screen 37 and the arc-shaped through hole 32 on the guide plate 31 in turn. During the process, the impurities intercepted on the first filter screen 37 are washed down, and at the same time, the water flow also carries the large particles of impurities on the guide plate 31 into the slag discharge pipe 184, so that the impurities on the first filter screen 37 and the guide plate 31 are discharged into the negative pressure area of ​​the recovery tank body 1 through the slag discharge pipe 184 and the sixth solenoid valve, thereby realizing the unified collection of fibers and impurities. After that, the plug at the conical discharge end of the recovery tank body 1 is removed to discharge the impurities in the negative pressure area. When discharging mud, sand, and larger fibers and impurities, part of the water flowing into the negative pressure area will be recovered and reused by the negative pressure generated by the pressure cylinder body 42, thereby avoiding waste of water resources. In addition, after removing the plug, the annular filter element 10 can be taken out to clean the impurities attached to its surface, thereby effectively maintaining the filtering performance of each component of the equipment.

[0031] The specific working principle of the papermaking white water recovery equipment of the present invention is as follows: When using the papermaking white water recovery equipment, first, the white water discharged from the papermaking equipment is introduced into the internal recovery and storage space of the recovery tank body 1 through the open end thereof, and 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 toggle member 35 reciprocates forward and reverse 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 for a second time by the first filter screen 37 and falls into the filtered water outlet area of ​​the water collector 38. It is controlled by the first solenoid valve 39 to be discharged into two flotation areas. At the same time, the drive shaft 34 drives the polygonal cylinder 41 to rotate, and the transmission screw 45 causes the rubber stopper 46 to move back and forth in the cylindrical groove section. When the rubber stopper 46 rises, gas is injected into the sealed container 22 through the positive pressure pipeline 48. When it descends, 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. 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, and the opening and closing flap 14 is adsorbed and sealed to form a negative pressure around the pressure cylinder body 42. At this time, the papermaking white water is sucked into the cylinder through the water inlet check valve on the pressure cylinder body 42. The annular filter element 10 ensures that only water can enter and impurities are intercepted outside. When the piston unit 43 moves downward, the electromagnetic adsorption device 15 is de-energized, and the piston unit 43 is pressed downward to allow the water in the cylinder to pass through the second filter screen 13, push the opening and closing flap 14 and flow into the top of the piston unit 43. As the piston unit 43 continues to move, 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 supply pipe 11 to replenish the water in the sealed container 22. In the sealed container 22, gas is injected into the water from the gas release seat 7 via the annular distribution hose 8 in the form of tiny bubbles. Flocculant added through the injection port causes small impurities to flocculate. After the white water flows into the flotation area, the second solenoid valve 51 is opened, and the gas-rich water flows through the guide pipe 52 and the microbubble releaser 53 releases tiny bubbles, causing the flocculated impurities to float up to the bubbles to form a foam layer. After flotation is completed, the electric slide 61 drives the arc-shaped negative pressure seat 62 to the liquid surface, and the third solenoid valve opens the air extraction and drainage pipe 64. The foam layer is sucked into the negative pressure area by the negative pressure. At the same time, the precipitated impurities in the flotation area flow into the negative pressure area through the drainage 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 recovered through the drainage pipe 17. After the equipment has been running for a period of time, the filter backwash component 18 is started, and the pump body 181 pumps the purified white water to between the first filter screen 37 and the water collector 38, reversely flushing the first filter screen 37 and the guide plate 31, and the 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 taken out 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 continuous and efficient operation of the equipment.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0033] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A papermaking white water recovery device, characterized in that: include: A recovery tank body (1), wherein the recovery tank body (1) has a recovery accommodating space therein, and a conical discharge end is provided at one end thereof, and an opening is provided at the other end thereof, and papermaking white water flows into the recovery tank body (1) through the opening; A partition assembly (2) is provided inside the recovery tank (1) and is used to separate the internal space of the recovery tank (1) into a negative pressure area and two air flotation areas; A filter assembly (3) is provided inside the recovery tank (1) and is used to perform multi-stage filtration on the papermaking white water flowing into the recovery tank (1), intercept fibers and impurities of different particle sizes, and allow the filtered white water to flow into two flotation areas; A pressure generating assembly (4) is provided in the negative pressure area of ​​the recovery tank (1) and is used to generate negative pressure and positive pressure in the negative pressure area; the negative pressure generated by the pressure generating assembly (4) is used to accelerate the filtering speed of the filter assembly (3); the pressure generating assembly (4) is connected to the air flotation assembly (5), and the positive pressure generated by the pressure generating assembly (4) is used to inject tiny bubbles into the white water that has undergone multi-stage filtration in the two air flotation areas, so that small particle fibers, fillers and other impurities adhere to the bubbles and float to form a foam layer; A foam collecting assembly (6) is provided inside the recovery tank (1) and is in communication with the negative pressure area, wherein the negative pressure generated by the pressure generating assembly (4) is used to collect and transfer the foam layer to the negative pressure area; The precipitated impurities in the flotation area flow into the negative pressure area, the precipitated impurities and the foam layer in the negative pressure area are discharged from the recovery tank (1) through the discharge end, and the white water in the flotation area after impurities removal is discharged from the recovery tank (1) for recycling.

2. The papermaking white water recovery equipment according to claim 1, characterized in that: The partition assembly (2) comprises: A transverse partition (21) is fixedly installed in the recovery tank (1) and encloses the conical discharge end of the lower half of the recovery tank (1) to form the negative pressure area; A sealed container (22) is fixedly mounted on a surface of the transverse partition (21) away from the negative pressure area, and forms a sealed chamber therein; There are two vertical partitions (23) which are fixedly mounted on the outside of the sealed container (22) and cooperate with the transverse partition (21) and the sealed container (22) to divide the upper half of the recovery tank (1) into two flotation areas.

3. The papermaking white water recovery equipment according to claim 2, characterized in that: The filter assembly (3) comprises: A guide plate (31) is fixedly mounted on the inner side of the recovery tank (1), and its upper surface is used to receive the inflowing papermaking white water. A plurality of arc-shaped through holes (32) are opened on the surface of the guide plate (31). The arc-shaped through holes (32) are divided into two groups, which are symmetrically distributed with the axis of the guide plate (31) as the center and are not connected to each other. A forward and reverse driving motor (33) is arranged at the axis center of the recovery tank (1), and an output end thereof is connected to a driving shaft (34), wherein the driving shaft (34) sequentially passes through the guide plate (31), the sealed container (22), and extends into the negative pressure area; A toggle member (35) is fixedly sleeved on the outside of the drive shaft (34), and two groups of stirring rods (36) are provided on a side of the toggle member close to the guide plate (31). The number and distribution of the stirring rods (36) are arranged corresponding to the arc-shaped through holes (32), and the stirring rods (36) extend into the two groups of the arc-shaped through holes (32) respectively. A first filter screen (37) is fixedly arranged inside the recovery tank (1) and below the guide plate (31); The water collector (38) is fixedly arranged on the inner side of the recovery tank (1), and is concave 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 (39), and the water outlet end of each first solenoid valve (39) corresponds to one of the flotation areas.

4. The papermaking white water recovery equipment according to claim 3, characterized in that: The pressure generating component (4) comprises: A polygonal column (41) is sleeved on an 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 arranged in the negative pressure area inside the recovery tank (1), and the polygonal column (41) passes through the pressure cylinder (42) and is rotatably connected to the axis thereof; A piston unit (43) is disposed in the pressure cylinder (42) and is displaceable along the inner wall thereof; A guide groove (44) is formed at one end of the polygonal column (41) away from the drive shaft (34), and is composed of a spiral groove section and a cylindrical groove section that are interconnected; a transmission screw (45), one end of which is connected to the piston unit (43) and the other end of which is threadably engaged with the spiral groove segment; a rubber plug (46) disposed at the end of the transmission screw (45) and located in the cylindrical groove section; A negative pressure pipeline (47), the outlet end of which is in communication with the cylindrical groove section, and an air intake check valve is provided on the negative pressure pipeline (47); A positive pressure pipeline (48), the inlet end of which is in communication with the cylindrical groove section, the positive pressure pipeline (48) is provided with an air outlet one-way valve, and the outlet end of which extends into the sealed container (22); a pressure transmission pipeline (49), one end of which is in communication with the negative pressure area, and the other end of which extends between the first filter screen (37) and the water collector (38); The rubber stopper (46) moves back and forth in the cylindrical groove section along with the transmission screw (45), extracts 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 (37) and the water collector (38) through the pressure transmission pipeline (49), thereby accelerating the white water to pass through the first filter (37).

5. The papermaking white water recovery equipment according to claim 4, characterized in that: At least four gas release seats (7) located in the sealed container (22) are fixedly provided on the outer peripheral wall of the drive shaft (34), and the gas release seats (7) are all connected to the 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), and the other end of the pressure relief pipeline (9) extends to the outside of the recovery tank (1) and is provided with a pressure relief valve.

6. The papermaking white water recovery equipment according to claim 4, characterized in that: An annular filter element (10) is sleeved 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 recovery 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 is hinged with an opening and closing flap (14). An electromagnetic adsorption device (15) that is magnetically matched with the opening and closing flap (14) is provided on the inside of the water outlet hole (12). A plurality of axial guide rods are also provided on the inside of the pressure cylinder (42). The piston unit (43) is passed through the guide rods and can move along the axial direction thereof.

7. The papermaking white water recovery equipment according to claim 2, characterized in that: The air flotation component (5) comprises: 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 the flow guide pipes (52) corresponds to that of the second solenoid valves (51), the inlet ends of the flow guide pipes (52) are connected to the second solenoid valves (51), and the outlet ends of the flow guide pipes (52) are closed; The microbubble releasers (53) are multiple and evenly divided into two groups, and are respectively arranged on the two guide pipes (52) for releasing microbubbles into the flotation area.

8. The papermaking white water recovery equipment according to claim 4, characterized in that: The foam collecting assembly (6) comprises: Two electric slides (61) are vertically fixed on the surface of the sealed container (22) and parallel to its axis, and are respectively arranged in the two air flotation areas; An arc-shaped negative pressure seat (62) is connected to the output end of the electric slide (61) and can be moved to the level of the filtered white water under the drive of the electric slide (61). A liquid level detection infrared sensor (63) is provided on the surface of the arc-shaped negative pressure seat (62) away from the opening end of the recovery tank (1); An air extraction and drainage 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 electromagnetic valve is provided on the air extraction and drainage pipe (64).

9. The papermaking white water recovery equipment according to claim 3, characterized in that: A drainage channel (16) corresponding to the two flotation areas is provided through the transverse partition (21), and a fourth solenoid valve is provided on the drainage channel (16). The drainage channel (16) is also connected to a drainage pipeline (17) extending to the outside of the recovery tank (1), and a fifth solenoid valve is provided on the drainage pipeline (17).

10. The papermaking white water recovery equipment according to claim 9, characterized in that: The drainage pipeline (17) is provided with a filter backwash component (18), and the filter backwash component (18) comprises: A pump body (181) is arranged outside the recovery tank (1), and its inlet end is connected to the discharge pipeline (17) through a suction pipeline (182); a liquid outlet pipeline (183), the inlet end of which is in communication with the outlet end of the pump body (181), and the outlet end of which extends to the area between the first filter screen (37) and the water collector (38); A slag discharge pipe (184) is provided through the guide plate (31), and an 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).

Images