Wastewater recovery treatment equipment for plate production

Abstract

The invention relates to the technical field of viscose fiber wastewater treatment, and discloses wastewater recovery treatment equipment for plate production, which comprises treatment areas, a variable pump, a booster pump, an electric switching valve, a connecting pipeline, a control cleaning device and filter screens, the treatment areas are communicated through the connecting pipeline, and the filter screens are symmetrically mounted in the connecting pipeline. A control cleaning device is mounted on the connecting pipeline, is in signal connection with the variable pump and is communicated with one end of an electric switching valve, the electric switching valve is communicated with the booster pump, and the other end of the electric switching valve is communicated with a jet aerator in the treatment area; the system can monitor the change of the flow speed in the pipeline in real time, when the flow speed is reduced, the system immediately and automatically starts physical backwashing to quickly remove blockage, and if the flow speed is still lower than a preset threshold value, the system further automatically adjusts the variable pump according to the flow speed and accurately controls the filling amount of a chemical agent, so that the dynamic optimization of the wastewater treatment process is realized.

Description

Technical Field

[0001] This invention relates to the field of viscose fiber wastewater treatment technology, specifically to a wastewater recycling and treatment device for board production. Background Technology

[0002] The production of wood-based panels (such as engineered wood products, plywood, and fiberboard) generates large quantities of industrial wastewater with high suspended solids and high COD, containing sawdust, adhesives, and chemical residues. Direct discharge of this wastewater without effective treatment will severely pollute the water environment and waste water resources. Therefore, efficient recycling and treatment of wastewater from wood-based panel production has become an essential requirement for the industry's sustainable development. Existing advanced industrial wastewater treatment technologies often employ a combination of catalytic oxidation and physicochemical treatment. For example, patent CN114436438B discloses an integrated catalytic oxidation reactor for treating viscose fiber wastewater. This reactor, by setting up a premixing zone, a catalytic oxidation zone, a pH adjustment zone, and a terminal flocculation zone, and incorporating catalytic reflux, jet aeration, and anti-scaling components with stirring and ultrasonic cleaning functions, has achieved certain effects in improving mixing efficiency, reducing reagent consumption, and mitigating scaling. However, the anti-scaling mechanism lacks adaptability and self-adaptability: the existing anti-scaling components adopt a fixed stirring blade structure. Although the surface is coated with anti-scaling and corrosion-resistant material, its position and posture are fixed. It cannot adapt and adjust according to the scaling condition of the inner wall of the pipe or the flow state of the wastewater. In viscose fiber wastewater with high hardness and high sulfate, scale is easy to accumulate locally in the gap between the blade and the pipe wall, forming a "dead corner" and affecting the scaling effect and the mass transfer efficiency of the system.

[0003] Meanwhile, the system lacks an adaptive control mechanism based on the medium state: although the system is equipped with chemical reflux and jet aeration functions, its operating parameters, such as dosage, aeration intensity, and flow rate control, mainly rely on preset operating conditions and human experience settings. It lacks the ability to sense and provide feedback on the real-time properties of wastewater, such as viscosity, pollutant load, and flow rate changes. When the wastewater composition fluctuates or the system's flow resistance increases due to scaling, the existing device cannot dynamically identify and adjust the treatment strategy, which can easily lead to excessive chemical addition or insufficient reaction, affecting the treatment effect and economy.

[0004] The triggering of cleaning and treatment actions relies on passive signals: existing cleaning methods such as ultrasonic transducers need to be triggered periodically or manually, which fails to form a closed-loop linkage with the wastewater flow state or the degree of scaling. This leads to a disconnect between the timing of cleaning and actual needs, which may result in untimely cleaning or waste of energy and chemicals.

[0005] Therefore, a wastewater recycling and treatment device for board production is needed to solve the above problems. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a wastewater recycling and treatment equipment for board production, comprising a treatment zone, a variable pump, a booster pump, an electric switching valve, connecting pipes, a control and cleaning device, and a filter screen. The treatment zones are connected by connecting pipes, and filter screens are symmetrically installed in the connecting pipes. A control and cleaning device is installed on the connecting pipes, and the control and cleaning device is signal-connected to the variable pump. The control and cleaning device is connected to one end of the electric switching valve, the electric switching valve is connected to the booster pump, and the other end of the electric switching valve is connected to a jet aerator in the treatment zone. The control and cleaning device includes a base block, on which a triggering mechanism, an anti-scaling mechanism, a backflushing mechanism, and a liquid inlet mechanism are respectively installed. The base block is threadedly connected to a connecting pipe. The triggering mechanism includes a cylinder body, which is installed in a first through hole in the base block. The cylinder body is slidably connected to a cylinder rod and is connected to a micro air pump via a pipeline. The upper end of the cylinder rod is drivenly connected to a rotating block, and the rotating block is drivenly connected to an anti-scaling mechanism. A first pressure relief valve is installed at the lower end of the cylinder body. A trigger block is installed on the base block and is slidably connected to the surface of the cylinder rod. A backflushing cleaning switch and a sliding rheostat are sequentially installed on the cylinder rod located at the lower end of the trigger block. The backflushing cleaning switch is signal-connected to an electric switching valve, and the sliding rheostat is signal-connected to a variable pump.

[0007] Furthermore, the recoil mechanism includes a mounting block, a pressure spring, a piston block, a movable rod, and a second pressure relief valve. The mounting block is threadedly connected to a threaded groove in the base block. One end of the pressure spring is connected to the upper end of the mounting block, and the other end of the pressure spring is connected to the piston block. The piston block is slidably connected to the piston groove in the base block. The movable rod is mounted on the piston block and is slidably connected to a piston through hole in the base block. The second pressure relief valve is mounted at the piston through hole, and the lower end of the piston groove is connected to one end of an electric switching valve.

[0008] Furthermore, the liquid inlet mechanism includes a tank, a connecting pipe, a liquid replenishment check valve, and a fourth pressure relief valve. The liquid replenishment check valve is installed in a second through hole opened at the upper end of the piston groove. The second through hole is connected to one end of the connecting pipe, and the other end of the connecting pipe is connected to the tank. A third through hole is opened at the upper end of the piston groove, and the fourth pressure relief valve is installed in the third through hole.

[0009] Furthermore, the anti-scaling mechanism includes a pressure pipe, a pressure bolt, a pressure piston, a connecting block, a connecting bolt, a bearing, a mounting groove, a rubber flexible rod, and blades. The lower end of the pressure pipe has a threaded hole, and the upper end of the pressure pipe has a piston hole. The threaded hole is threadedly connected to the pressure bolt, and the pressure bolt is connected to the pressure piston. The pressure piston is slidably connected to the piston hole, and the piston hole communicates with the internal air passage of the connecting block. The connecting block communicates with the internal air passage of the rubber flexible rod. Blades are mounted on the outer ring of the rubber flexible rod. A venting groove is formed along the axial direction on the rubber flexible rod, and the venting groove communicates with a venting through hole formed by the connecting bolt. The venting through hole communicates with the internal air passage of the connecting block.

[0010] Furthermore, the connecting block is symmetrically equipped with bearings, the connecting bolt passes through the inner ring of the bearing and is threadedly connected to the connecting block, the outer ring of the bearing has an installation groove on one side, the installation groove is fitted with a rubber flexible rod, the outer ring of the bearing has a threaded hole, the threaded hole is threadedly connected to an installation nut, and one of the installation nuts is used to install a rotating block.

[0011] Furthermore, the surface of the rubber flexible rod is provided with a spiral mounting strip, on which blades are mounted. A rectangular groove is formed in the inner circle of the mounting strip, and the rectangular groove communicates with the vent groove.

[0012] Furthermore, the blade is made of stainless steel spring steel and has an overall spiral structure with radial elasticity, allowing it to rotate with the fluid and adaptively conform to the inner wall of the pipe.

[0013] Compared with the prior art, the technical solution of the present invention has the following advantages: (1) This invention achieves fully automatic, hierarchical intelligent control of the wastewater treatment system through a unique mechanical-electric linkage design. The system uses the blade rotation speed to reflect the wastewater flow state in real time, and uses a dynamic balancing mechanism composed of a micro air pump and a rotating block to convert the rotation speed signal into the linear displacement of the cylinder rod. The displacement triggers a two-stage response: first, physical backwashing is started to clear physical blockages; if ineffective, chemical dosing is started to enhance oxidation treatment. The entire process does not require external sensors or manual intervention. The system can automatically select the response level according to the degree of deterioration of the working conditions, realizing a fully closed-loop adaptive control from monitoring, judgment to execution, which significantly improves the treatment efficiency and system reliability. (2) The backflushing mechanism and the liquid inlet mechanism work together to achieve high efficiency in the cleaning process and economical use of cleaning agents. The piston block completes the high-pressure injection of cleaning agent and gas backflushing in stages during a single upward stroke, forming a sequential synergistic cleaning of cleaning agents and gas, effectively removing scale from the filter screen and pipe wall. When the piston returns to its original position, the cleaning agent is automatically replenished from the tank through negative pressure, realizing small-dose and cyclical use of the cleaning agent. This design not only cleans thoroughly and consumes little energy, but also avoids waste of cleaning agents, reduces operating costs, and ensures that the system always has immediate cleaning capability during continuous operation. (3) This equipment adopts a modular and mechanical structure design. All mechanisms are integrated into the base block and connected to the pipe thread. Installation and disassembly are convenient. The blades of the anti-scaling mechanism adopt a stainless steel spring steel spiral elastic structure, which can withstand the corrosion of wastewater for a long time and can adapt to the pipe diameter and scale surface to avoid damage to the pipe wall. The triggering mechanism and the backflushing mechanism rely on pneumatic and mechanical action, without precision electronic components. It is anti-interference and pollution resistant, and suitable for long-term stable operation in harsh industrial environments. The overall system structure is simple, the maintenance cost is low, and it has good versatility and adaptability to working conditions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the structure of the cleaning control device in this invention; Figure 4 This is a schematic diagram of the internal structure of the connecting pipe in this invention; Figure 5 for Figure 4 Enlarged view at point B in the middle; Figure 6 This is a schematic diagram of the anti-scaling mechanism in the present invention; Figure 7 for Figure 6 Enlarged view at point C; Figure 8 for Figure 6 Enlarged view of point D in the middle.

[0015] In the diagram: 1-Processing area, 2-Variable pump, 3-Booster pump, 4-Electric switching valve, 5-Connecting pipe, 6-Control cleaning device, 61-Base block, 611-First perforation, 612-Threaded groove, 613-Piston groove, 614-Piston perforation, 62-Trigger mechanism, 621-Cylinder body, 622-Cylinder rod, 623-Backwash cleaning switch, 624-Sliding rheostat, 625-Rotating block, 626-Trigger block, 627-First pressure relief valve, 628-Miniature air pump, 63-Anti-scaling mechanism, 631-Pressure... Force tube, 632-pressure bolt, 6321-pressure piston, 633-connecting block, 634-connecting bolt, 635-bearing, 6351-mounting groove, 636-rubber flexible rod, 637-mounting nut, 638-blade, 64-recoil mechanism, 641-mounting block, 642-pressure spring, 643-piston block, 644-moving rod, 645-second pressure relief valve, 65-liquid inlet mechanism, 651-tank body, 652-connecting pipe, 653-liquid replenishment check valve, 654-fourth pressure relief valve, 7-filter screen. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0017] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0018] like Figures 1 to 8As shown, the present invention provides a wastewater recycling and treatment device for board production, comprising a treatment zone 1, a variable pump 2, a booster pump 3, an electric switching valve 4, a connecting pipe 5, a control and cleaning device 6, and a filter screen 7. The treatment zones 1 are connected by the connecting pipe 5. Filter screens 7 are symmetrically installed inside the connecting pipe 5. The control and cleaning device 6 is installed on the connecting pipe 5 and is signal-connected to the variable pump 2. The control and cleaning device 6 is connected to one end of the electric switching valve 4. The electric switching valve 4 is connected to the booster pump 3. The other end of valve 4 is connected to the jet aerator in treatment zone 1; the control cleaning device 6 includes a base block 61, on which a trigger mechanism 62, an anti-scaling mechanism 63, a backflushing mechanism 64, and a liquid inlet mechanism 65 are respectively installed. The base block 61 is threadedly connected to the connecting pipe 5; the trigger mechanism 62 includes a cylinder body 621, which is installed in the first through hole 611 opened in the base block 61. The cylinder body 621 is slidably connected to the cylinder rod 622, and the cylinder body 621 is connected to the micro air pump 628 through a pipe. The upper end of the cylinder rod 622 is connected to the rotating block 625, and the rotating block 625 is connected to the anti-scaling mechanism 63. The lower end of the cylinder body 621 is equipped with a first pressure relief valve 627. The base block 61 is equipped with a trigger block 626, which is slidably connected to the surface of the cylinder rod 622. The backflushing cleaning switch 623 and the sliding rheostat 624 are sequentially installed on the cylinder rod 622 located at the lower end of the trigger block 626. The backflushing cleaning switch 623 is connected to the electric switching valve 4, and the sliding rheostat 624 is connected to the variable pump 2. By integrating the control cleaning device 6 into the connecting pipe 5 and linking it with the variable pump 2 and the electric switching valve 4, embedded real-time monitoring and automatic response of the treatment process are realized. The trigger mechanism 62 uses the mechanical dynamic balance principle to convert the wastewater flow state into the displacement signal of the cylinder rod 622, and then triggers subsequent actions in stages through the switch and rheostat. The entire system does not require external electronic sensors, has a simple and reliable structure, strong anti-interference ability, and can automatically execute different levels of treatment measures according to the degree of deterioration of the working conditions.

[0019] The recoil mechanism 64 includes a mounting block 641, a pressure spring 642, a piston block 643, a movable rod 644, and a second pressure relief valve 645. The mounting block 641 is threadedly connected to a threaded groove 612 in the base block 61. One end of the pressure spring 642 is connected to the upper end of the mounting block 641, and the other end of the pressure spring 642 is connected to the piston block 643. The piston block 643 is slidably connected to the piston groove 613 in the base block 61. The movable rod 644 is mounted on the piston block 643, and the movable rod 644 is slidably connected to the piston through hole 614 in the base block 61. A second pressure relief valve 645 is installed at the piston perforation 614. The lower end of the piston groove 613 is connected to one end of the electric switching valve 4. The backflushing mechanism 64 adopts a pneumatic piston structure and is driven by high-pressure gas controlled by the electric switching valve 4. The upward stroke of the piston block 643 is designed to act in stages: first, the cleaning agent in the upper chamber is compressed, and then at the end of the stroke, the moving rod 644 extends out of the piston perforation 614 to open the second pressure relief valve 645 for gas backflushing. The timing control of cleaning agent injection and gas backflushing is realized by using the same gas source. The cleaning process is efficient and has high energy utilization.

[0020] The liquid inlet mechanism 65 includes a tank 651, a connecting pipe 652, a replenishing check valve 653, and a fourth pressure relief valve 654. The replenishing check valve 653 is installed in the second perforation at the upper end of the piston groove 613. The second perforation is connected to one end of the connecting pipe 652, and the other end of the connecting pipe 652 is connected to the tank 651. A third perforation is opened at the upper end of the piston groove 613, and the fourth pressure relief valve 654 is installed in the third perforation. The liquid inlet mechanism 65 realizes the automatic injection and automatic replenishment circulation of cleaning agent through the replenishing check valve 653 and the fourth pressure relief valve 654, ensuring that it enters the pipeline at the beginning of backflushing. The replenishing check valve 653 automatically draws and replenishes the cleaning agent from the tank 651 using negative pressure when the piston resets. The small dose, precision, and cyclic use of the agent avoids the waste caused by continuous dosing and ensures that there is a sufficient amount of cleaning agent in reserve for each backflushing.

[0021] The anti-scaling mechanism 63 includes a pressure pipe 631, a pressure bolt 632, a pressure piston 6321, a connecting block 633, a connecting bolt 634, a bearing 635, a mounting groove 6351, a rubber flexible rod 636, and a blade 638. The lower end of the pressure pipe 631 has a threaded hole, and the upper end of the pressure pipe 631 has a piston hole. The threaded hole is threadedly connected to the pressure bolt 632. The pressure bolt 632 is connected to the pressure piston 6321, and the pressure piston 6321 is slidably connected to the piston hole. The piston hole is connected to the internal air passage of the connecting block 633, and the connecting block 633 is connected to the internal air passage of the rubber flexible rod 636. The rubber flexible rod 636 is externally... The blade 638 is mounted in a ring. The rubber flexible rod 636 has a venting groove along the axial direction. The venting groove is connected to the venting through hole opened by the connecting bolt 634. The venting through hole is connected to the internal air passage of the connecting block 633. The anti-scaling mechanism 63 is the core of the state sensing of this invention. The blade 638 is in direct contact with the wastewater, and its rotation speed directly reflects the fluid resistance, that is, the wastewater properties and the pipeline state. By adjusting the pressure piston 6321 through the pressure bolt 632, the rubber flexible rod 636 can be pre-tightened and the radial contact force of the blade 638 can be controlled. This mechanism directly converts the fluid state into a mechanical rotation signal, providing accurate and real-time input for subsequent control.

[0022] The connecting block 633 is symmetrically equipped with bearings 635. Connecting bolts 634 pass through the inner ring of the bearings 635 and are threadedly connected to the connecting block 633. An installation groove 6351 is formed on one side of the outer ring of the bearings 635, and a rubber flexible rod 636 is fitted into the groove 6351. A threaded hole is formed on the outer ring of the bearings 635, and this threaded hole is threadedly connected to an installation nut 637. One of the installation nuts 637 is used to install a rotating block 625. The connecting block 633 and the rubber flexible rod 636 are connected via the bearings 635, ensuring flexible rotation of the blade 638 assembly and minimizing frictional loss. The fit between the installation nut 637 and the threaded hole makes the entire anti-scaling mechanism 63 easy to install, disassemble, and maintain. The rotating block 625 is directly mounted on an installation nut 637, achieving direct, coaxial transmission from the rotation of the blade 638 to the rotation of the rotating block 625. This results in a compact structure, high power transmission efficiency, and allows for easy adjustment of the triggering characteristics by replacing rotating blocks with different profiles.

[0023] The rubber flexible rod 636 has a spiral mounting strip on its surface, on which blades 638 are mounted. A rectangular groove is formed on the inner ring of the mounting strip, communicating with the vent slot. This spiral mounting strip and rectangular groove design ensures that the blades 638 are securely and evenly mounted on the rubber flexible rod 636, while maintaining unobstructed airflow through the vent slot. This structure allows the blades 638 to deform evenly along the spiral line under stress, better conforming to the pipe wall without obstructing ventilation. The fit between the mounting strip and the rectangular groove also facilitates the replacement of the blades 638 or adjustment of their spacing, improving the maintainability and adaptability of the equipment.

[0024] The blade 638 is made of stainless steel spring steel and has an overall spiral structure with radial elasticity. It can rotate with the fluid and adapt to the inner wall of the pipe. The use of stainless steel spring steel to manufacture the blade 638 ensures its long-term durability in the corrosive environment of wastewater. The spiral structure gives the blade 638 radial elasticity, which allows it to adapt to the inner wall of the pipe and always maintain effective scraping contact. This elastic design also avoids damage to the pipe wall caused by hard scraping.

[0025] The working principle and usage process of this invention: When the system is running normally, the micro air pump 628 continuously supplies air to the cylinder body 621, driving the cylinder rod 622 to move slowly upward. At the same time, wastewater flows in the connecting pipe 5, driving the blades 638 of the anti-scaling mechanism 63 and the coaxial rotating block 625 to rotate. When rotating, the rotating block 625 presses down on the upper end of the cylinder rod 622, forcing the gas in the cylinder to be quickly discharged through the first pressure relief valve 627, thereby effectively suppressing the dynamic position of the cylinder rod 622 to a low-level equilibrium state, so that the backwash cleaning switch 623 and the sliding rheostat 624 integrated on it are both in the untriggered position.

[0026] When the system detects an anomaly, it executes a two-level intelligent response: First stage: Physical backwash response. When wastewater flow decreases or there is a risk of physical blockage, such as scale buildup on filter screen 7, causing a decrease in the rotational speed of blade 638, the downward pressure frequency and force of rotating block 625 weakens. Cylinder rod 622, driven by micro-pump 628, begins to accumulate upward displacement, initially triggering the relatively low-positioned backwash cleaning switch 623. When cylinder rod 622 rises to the position triggering backwash cleaning switch 623, it generates a trigger pulse signal. Upon receiving this pulse signal, the drive circuit of electric switching valve 4 initiates the backwash process and enters a preset lockout period. During this lockout period, the system ignores any subsequent trigger signals from backwash cleaning switch 623 to prevent repeated backwashing and ensure the ability to trigger the second stage, controlling the electric switching valve 4 to cut off the normally open path to the jet aerator and instead supply power to the booster pump 3. High-pressure gas is introduced into the lower end of the piston groove 613 of the backwash mechanism 64. The high-pressure gas pushes the piston block 643 to move upward against the resistance of the pressure spring 642. The upward movement of the piston block 643 compresses the volume of the upper cavity of the piston groove 613, and the pressure of the cleaning agent in the cavity increases. When the pressure exceeds the set value of the replenishment check valve 653, the valve opens, and the cleaning agent is directly injected into the connecting pipe 5 through the connecting pipe 652, forming a high-pressure flushing flow. At the same time, the high-pressure gas continuously flowing into the lower cavity of the piston groove 613 continues to drive the piston block 643 and the moving rod 644 to rise. When the moving rod 644 rises out of the piston perforation 614, the high-pressure gas is discharged through the second pressure relief valve 645 and directly enters the connecting pipe 5, forming violent bubble cutting and agitation at the filter screen 7. Together with the injected cleaning agent, it completes the bubble cutting, hydraulic backwashing and physical cleaning of the filter screen 7 and the pipeline. The entire backwashing cleaning process lasts for about tens of seconds. After the backflushing process is completed, the electric switching valve 4 automatically resets, cutting off the air passage from the booster pump 3 to the lower end of the piston groove 613. At the same time, the electric switching valve 4 connects the backflushing air passage to the exhaust passage to achieve pressure relief. After the pressure at the lower end of the piston groove 613 is released, the pressure spring 642 pushes the piston block 643 to reset and move downward. When the piston block 643 moves downward, the volume of the upper cavity of the piston groove 613 increases, forming a negative pressure. Through the liquid replenishment check valve 653, part of the cleaning agent stored in the tank 651 is drawn into the upper cavity of the piston groove 613 to achieve automatic pre-filling of the cleaning agent, preparing for the next backflushing. After the first-level response is completed, the system returns to the normal monitoring state and enters a preset observation period. During this period, the cylinder rod 622 starts to move slowly upward again under the push of the micro air pump 628. If the flow of wastewater is restored due to backflushing cleaning, the speed of the blade 638 returns to the normal range, and the rotating block 625 resumes high-frequency downward pressure, then the cylinder rod 622 will be pressed back to the low position, and the system continues to operate normally. Level Two: Chemical Dosing Response. If, during the observation period, the wastewater's properties, such as viscosity and pollutant concentration, remain unchanged, and fluid resistance remains high, the rotational speed of blade 638 cannot be restored. The suppressive effect of rotating block 625 on cylinder rod 622 continues to weaken. Under the continuous push of micro-pump 628, cylinder rod 622 continues to accumulate upward displacement. Its upward height is inversely proportional to the degree of decrease in the rotational speed of blade 638; that is, the lower the rotational speed, the higher the final position of cylinder rod 622. When cylinder rod 622 rises to a higher position, the sliding rheostat 624 mounted on it rises accordingly and contacts trigger block 626 fixed on base block 61. After contact, the continued rise of the cylinder rod 622 will push the slider of the sliding rheostat 624 to move, thereby changing its resistance value. The amount of change in resistance value is linearly related to the displacement of the cylinder rod relative to the trigger block 626, that is, the degree of decrease in the rotational speed of the blade 638. The changing resistance signal is transmitted to the variable pump 2. The variable pump 2 linearly adjusts and increases the dosage of oxidation treatment agents such as hydrogen peroxide according to the received resistance signal. The lower the rotational speed of the blade 638, the greater the displacement of the cylinder rod 622, and the greater the change in resistance, the greater the increase in the dosage of the agent. When the wastewater properties are improved due to the chemical treatment and the rotational speed of the blade 638 rises again, the rotating block 625 resumes high-frequency downward pressure on the cylinder rod 622, and the cylinder rod 622 is pressed down. As the cylinder rod 622 moves downward, the sliding rheostat 624 disengages from the trigger block 626, and its slider automatically returns to its initial position under the action of the internal reset spring. The resistance value is then reset, and the signal received by the variable pump 2 disappears or returns to the reference value, thereby stopping the increase or restoring to the basic dosage.

[0027] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A wastewater recycling and treatment device for board production, comprising a treatment zone (1), a variable pump (2), a booster pump (3), an electric switching valve (4), connecting pipes (5), a control and cleaning device (6), and a filter screen (7), characterized in that: The treatment zones (1) are connected by connecting pipes (5). Filter screens (7) are symmetrically installed in the connecting pipes (5). A control cleaning device (6) is installed on the connecting pipes (5). The control cleaning device (6) is connected to the variable pump (2) by signal. The control cleaning device (6) is connected to one end of the electric switching valve (4). The electric switching valve (4) is connected to the booster pump (3). The other end of the electric switching valve (4) is connected to the jet aerator in the treatment zone (1). The control cleaning device (6) includes a base block (61), on which a triggering mechanism (62), an anti-scaling mechanism (63), a backflushing mechanism (64) and a liquid inlet mechanism (65) are respectively installed. The base block (61) is threadedly connected to the connecting pipe (5). The triggering mechanism (62) includes a cylinder body (621), which is installed in a first through hole (611) in the base block (61). The cylinder body (621) is slidably connected to a cylinder rod (622). The cylinder body (621) is connected to a micro air pump (628) through a pipe. The upper end of the cylinder rod (622) is drivenly connected to a rotating block (625). The rotating block (625) is drivenly connected to an anti-scaling mechanism (63). 1) A first pressure relief valve (627) is installed at the lower end. A trigger block (626) is installed on the base block (61). The trigger block (626) is slidably connected to the surface of the cylinder rod (622). A backflush cleaning switch (623) and a sliding rheostat (624) are installed sequentially on the cylinder rod (622) located at the lower end of the trigger block (626). The backflush cleaning switch (623) is signal-connected to the electric switching valve (4). The sliding rheostat (624) is signal-connected to the variable pump (2).

2. The wastewater recycling and treatment equipment for board production according to claim 1, characterized in that: The recoil mechanism (64) includes a mounting block (641), a pressure spring (642), a piston block (643), a moving rod (644), and a second pressure relief valve (645). The mounting block (641) is threadedly connected to a threaded groove (612) opened in the base block (61). The upper end of the mounting block (641) is connected to one end of the pressure spring (642), and the other end of the pressure spring (642) is connected to the piston block (643). The piston block (643) is slidably connected to the piston groove (613) opened in the base block (61). The moving rod (644) is mounted on the piston block (643). The moving rod (644) is slidably connected to the piston through hole (614) opened in the base block (61). The second pressure relief valve (645) is installed at the piston through hole (614). The lower end of the piston groove (613) is connected to one end of the electric switching valve (4).

3. The wastewater recycling and treatment equipment for board production according to claim 2, characterized in that: The liquid inlet mechanism (65) includes a tank body (651), a connecting pipe (652), a liquid replenishment check valve (653), and a fourth pressure relief valve (654). The liquid replenishment check valve (653) is installed in a second through hole at the upper end of the piston groove (613). The second through hole is connected to one end of the connecting pipe (652), and the other end of the connecting pipe (652) is connected to the tank body (651). A third through hole is opened at the upper end of the piston groove (613), and the fourth pressure relief valve (654) is installed in the third through hole.

4. The wastewater recycling and treatment equipment for board production according to claim 1, characterized in that: The anti-scaling mechanism (63) includes a pressure pipe (631), a pressure bolt (632), a pressure piston (6321), a connecting block (633), a connecting bolt (634), a bearing (635), a mounting groove (6351), a rubber flexible rod (636), and a blade (638). A threaded hole is formed at the lower end of the pressure pipe (631), and a piston hole is formed at the upper end of the pressure pipe (631). The threaded hole is threadedly connected to the pressure bolt (632), and the pressure bolt (632) is connected to the pressure piston. (6321) connection, the pressure piston (6321) is slidably connected to the piston hole, the piston hole is connected to the internal air passage of the connecting block (633), the connecting block (633) is connected to the internal air passage of the rubber flexible rod (636), the outer ring of the rubber flexible rod (636) is equipped with blades (638), the rubber flexible rod (636) has an axially formed venting slot, the venting slot is connected to the venting through hole formed by the connecting bolt (634), and the venting through hole is connected to the internal air passage of the connecting block (633).

5. The wastewater recycling and treatment equipment for board production according to claim 4, characterized in that: The connecting block (633) is symmetrically equipped with bearings (635). The connecting bolt (634) passes through the inner ring of the bearing (635) and is threadedly connected to the connecting block (633). An installation groove (6351) is opened on one side of the outer ring of the bearing (635). A rubber flexible rod (636) is fitted into the installation groove (6351). A threaded hole is opened on the outer ring of the bearing (635). The threaded hole is threadedly connected to the installation nut (637). One of the installation nuts (637) is used to install a rotating block (625).

6. The wastewater recycling and treatment equipment for board production according to claim 4, characterized in that: The surface of the rubber flexible rod (636) is provided with a spiral mounting strip, on which blades (638) are mounted. A rectangular groove is opened in the inner circle of the mounting strip, and the rectangular groove is connected to the vent groove.

7. The wastewater recycling and treatment equipment for board production according to claim 4, characterized in that: The blade (638) is made of stainless steel spring steel and has an overall spiral structure with radial elasticity. It can rotate with the fluid and adapt to fit the inner wall of the pipe.

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