High-efficiency filtering and purifying device for industrial sewage

Abstract

The invention provides a high-efficiency industrial sewage filtering and purifying device, which relates to the technical field of sewage treatment, and comprises a filter cartridge, a graded filtering mechanism arranged on the filter cartridge, and an adsorption and purification assembly arranged at the bottom of the filter cartridge and used for purifying filtered sewage, the graded filtering mechanism comprises a first-stage filtering assembly for statically filtering impurities in the sewage and a second-stage filtering assembly for dynamically filtering impurities in the sewage subjected to primary treatment, the first-stage filtering assembly and the second-stage filtering assembly are sequentially arranged on a filtering cylinder, and graded filtering is realized through sequential flowing of the sewage; the first-stage filtering assembly comprises a second filtering plate which is arranged at the top of the filtering cylinder and is used for primarily filtering sewage impurities entering the second-stage filtering assembly; the second-stage filtering assembly comprises a rotating cylinder coaxially arranged in the filtering cylinder in a penetrating mode through a rotating assembly, and a first filtering plate installed on an installation opening formed in the side face of the rotating cylinder. The sewage treatment device realizes efficient classified filtration of sewage, effectively purifies the sewage and is convenient to clean and maintain.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to an efficient industrial sewage filtering and purifying device. BACKGROUND

[0002] In the field of industrial sewage treatment, filtering and purifying is a key link, and its effect directly affects the subsequent treatment process and the final water quality. The existing industrial sewage filtering and purifying device has many problems.

[0003] For example, the patent for invention with publication number CN119034341B discloses an industrial sewage treatment device, which mainly uses a single filtering structure to treat sewage. In actual application, this single filtering structure is difficult to cope with the treatment needs of different sizes of impurities in the sewage. Larger size impurities are easy to block the filtering structure, resulting in a significant decrease in filtering efficiency, and even making the entire device unable to operate normally; while for smaller size impurities, the single filtering structure often cannot effectively intercept, so that the filtered sewage still contains many impurities, and the purifying effect is not ideal. In addition, the device lacks an effective cleaning mechanism, and as the filtering process continues, more and more impurities accumulate on the filtering structure, further reducing the filtering efficiency, and frequent shutdown for manual cleaning is required, increasing the operating cost and labor intensity.

[0004] Therefore, some industrial sewage filtering and purifying devices are provided with multi-stage filtering structures, but there is a lack of effective cooperation between the stages. In the prior art, after the sewage is filtered by the first stage, it is directly filtered by the second stage, without reasonable guiding and buffering of the sewage, resulting in unstable flow of the sewage between the first and second stages, affecting the filtering effect. Moreover, the cleaning method of these devices is relatively simple, usually only the surface of the filtering structure is washed, and stubborn impurities inside and on the surface of the filtering structure cannot be completely removed, and after a long time of use, the filtering performance of the filtering structure will be seriously reduced. SUMMARY

[0005] In view of the above problems, the present application provides an efficient industrial sewage filtering and purifying device.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an efficient industrial sewage filtering and purifying device, comprising a filtering cylinder, a staged filtering mechanism arranged on the filtering cylinder, and an adsorption and purification assembly arranged at the bottom of the filtering cylinder for purifying the filtered sewage, the staged filtering mechanism comprising a first filtering assembly for statically filtering impurities in the sewage and a second filtering assembly for dynamically filtering impurities in the sewage after the first treatment, the first filtering assembly and the second filtering assembly being arranged in sequence on the filtering cylinder, and the sewage flows through the first filtering assembly and the second filtering assembly in sequence to realize staged filtering; the adsorption and purification assembly is arranged at the bottom of the filtering cylinder and contacts the sewage filtered by the second filtering assembly to purify it;

[0007] The primary filtration assembly includes a second filter plate located at the top of the filter cartridge for preliminary filtration of wastewater and debris entering the secondary filtration assembly;

[0008] The secondary filtration assembly includes a rotating cylinder coaxially inserted into the filter cylinder via a rotating assembly, and a first filter plate installed on an installation port on the side of the rotating cylinder.

[0009] During industrial wastewater filtration and purification, the wastewater passes through the second filter plate to initially filter larger debris. The filtered wastewater then flows into the rotating cylinder. The rotating component drives the rotating cylinder to rotate, accelerating the flow of wastewater through the first filter plate installed on the side of the rotating cylinder. This filter removes smaller debris from the wastewater, which then collects at the bottom of the filter cylinder. The adsorption and purification component then further adsorbs and purifies the wastewater.

[0010] Preferably, the primary filtration assembly further includes an inlet tank installed on the top of the filter cartridge, an inlet pipe disposed on the top of the inlet tank, a connecting pipe whose bottom end extends into the filter cartridge and whose top end passes through the bottom side of the inlet tank, and a first cleaning component disposed in the inlet tank to control the discharge of debris from the filter surface of the second filter plate from the inlet tank. The filter surface at the top of the second filter plate has a concave curved structure, and the second filter plate is installed horizontally in the inlet tank.

[0011] Preferably, the first cleaning component includes a drain plate vertically disposed in the liquid inlet tank and located in the middle of the second filter plate, a rotating rod rotatably disposed in the liquid inlet tank and installed on the top side of the drain plate, and a first motor installed on the side of the liquid inlet tank and whose output end controls the rotation of the rotating rod. The liquid inlet tank has drain ports on the symmetrical sides of the second filter plate for discharging debris from the second filter plate.

[0012] Preferably, the end face of the drain plate is provided with a locking opening, a third filter plate is installed in the locking opening, and a cleaning strip is installed at the bottom of the drain plate to fit the top filter surface of the second filter plate.

[0013] Preferably, connecting blocks are installed on the symmetrical sides of the liquid inlet tank below the drain outlet opening. A collection block is detachably installed on the connecting block, and a collection port communicating with the drain outlet is opened on the side of the collection block.

[0014] Preferably, the secondary filtration assembly further includes a second motor installed on the bottom of the filter cylinder and whose output end passes through the filter cylinder to control the rotation of the rotating cylinder; a limiting ring fixedly installed on the top side of the rotating cylinder and having an annular limiting groove on the side; multiple limiting wheels arranged in a circumferential array on the inner wall of the filter cylinder; and a second cleaning component installed on the filter cylinder to control the discharge of debris from the filter surface of the first filter plate inside the rotating cylinder. The limiting wheels all pass through the limiting groove.

[0015] Preferably, the second cleaning component includes a cleaning disc that passes through the rotating cylinder and slides against the inner wall of the rotating cylinder; a lifting structure that is set on the filter cylinder and controls the cleaning disc to move up and down within the filter cylinder; multiple cleaning brushes arranged in a circumferential array with cleaning grooves on the side of the cleaning disc; a control structure that is installed on the cleaning disc and controls the multiple cleaning brushes to move to fit against the inner wall of the rotating cylinder; and a waste discharge structure set on the cleaning disc to discharge debris from the cleaning grooves into the filter cylinder. The top of the cleaning disc has a through-hole located below the end of the connecting pipe.

[0016] Preferably, the lifting structure includes a cleaning rod that moves axially through the top of the filter cylinder and is mounted at its bottom end on the top of the cleaning disc, a lifting rack mounted on the cleaning rod along its length, and a third motor mounted on the top of the filter cylinder and having a lifting gear meshing with the lifting rack at its output end.

[0017] Preferably, the control structure includes an adjusting ring movably sleeved on the cleaning rod, multiple adjusting blocks that are one-to-one installed on the ends of multiple cleaning brushes near the center of the cleaning disc, multiple linkage rods that are rotatably installed on the side of the adjusting ring with one end arranged in a circumferential array and the other end rotatably connected to the top of different adjusting blocks, a lifting screw vertically set on the top of the cleaning disc, and a lifting block that is threadedly sleeved on the lifting screw and installed on the adjusting ring. The lifting screw is driven by a lifting motor installed on the cleaning rod. The top of the adjusting block has an adjusting opening above the cleaning disc through the top end face of the cleaning disc, and the length direction of the opening of the adjusting opening passes through the center of the top of the cleaning disc.

[0018] Preferably, the waste discharge structure includes a cleaning pipe horizontally disposed at the top of the cleaning rod and having a conveying channel inside the cleaning rod; a partition strip passing through the conveying channel along the length of the cleaning rod and having its top inserted into the cleaning pipe; a discharge ring installed on the bottom of the cleaning tray and having a discharge groove at its top that communicates with the discharge port; a connecting plate disposed within the inner ring of the discharge ring; and multiple discharge pipes arranged in a circumferential array within the discharge ring, with both ends connected to the connecting plate and the discharge ring respectively. The top of the connecting plate has a cleaning port that communicates with one channel of the conveying channel separated by the partition strip. The other channel of the conveying channel separated by the partition strip communicates with a liquid inlet groove on the bottom wall of the cleaning tank. The cleaning tank has a discharge port near the bottom inner wall of the cleaning tray.

[0019] The beneficial effects of this invention are:

[0020] 1. By setting up primary and secondary filtration components, the system achieves tiered filtration of impurities in wastewater. The primary filtration component uses a second filter plate to initially filter larger impurities in the wastewater, while the secondary filtration component uses a rotating cylinder and a first filter plate to dynamically filter smaller impurities in the primary-treated wastewater. This tiered filtration method can target impurities according to their size characteristics, effectively improving filtration efficiency and avoiding the clogging problem of single-filter structures.

[0021] 2. In the secondary filtration assembly, the rotating component drives the rotating cylinder to rotate, which speeds up the passage of sewage through the first filter plate, allowing the sewage to fully contact the first filter plate, enhancing the filtration effect, and more effectively intercepting smaller debris in the sewage, thereby improving the degree of sewage purification.

[0022] 3. The primary and secondary filter components are cleaned using a first and a second cleaning unit. The first cleaning unit, driven by a first motor, rotates the rotating rod and the drain plate, working in conjunction with cleaning strips to remove debris from the second filter plate and discharge it through the drain port. This achieves automatic cleaning of the second filter plate, reducing the frequency and workload of manual cleaning. The second cleaning unit, through the coordinated action of the lifting structure, control structure, and waste discharge structure, can thoroughly clean debris from the first filter plate inside the rotating cylinder and discharge the debris from the filter cylinder, ensuring the long-term stable operation of the filter components and improving the overall service life of the device. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a simplified structural diagram of the high-efficiency filtration and purification device for industrial wastewater proposed in this invention.

[0025] Figure 2 This is a schematic diagram of the internal structure of the filter cartridge of the present invention.

[0026] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle.

[0027] Figure 4 This is a schematic diagram of the structure of the primary and secondary filter components of the present invention.

[0028] Figure 5 This is a schematic diagram of the structure of the second cleaning component of the present invention.

[0029] Figure 6 This is a schematic diagram of the waste discharge structure of the present invention.

[0030] Figure 7 This is a schematic diagram of the cross-sectional structure of the cleaning rod and cleaning tube of the present invention.

[0031] Figure 8 This is a schematic diagram of the primary filter component of the present invention.

[0032] Figure 9 This is a schematic diagram of the unfolded structure of the sewage discharge plate of the present invention.

[0033] In the diagram: 1. Filter cylinder; 2. Connecting pipe; 3. Drain pipe; 4. Cleaning rod; 5. Lifting rack; 6. Lifting gear; 7. Cleaning pipe; 8. Inlet tank; 9. Collection block; 10. Inlet pipe; 11. Rotating cylinder; 12. First filter plate; 13. Limiting ring; 14. Limiting groove; 15. Limiting wheel; 16. Cleaning disc; 17. Adjusting ring; 18. Linkage rod; 19. Lifting block; 20. Lifting motor; 21. Lifting screw 21. Rod; 22. Through-hole; 23. Divider plate; 24. Through-hole; 25. Adjustment port; 26. Adjustment block; 27. Cleaning brush; 28. Cleaning tank; 29. ​​Liquid inlet tank; 30. Discharge port; 31. Discharge ring; 32. Discharge tank; 33. Discharge pipe; 34. Cleaning port; 35. Divider strip; 36. Second filter plate; 37. Sewage discharge plate; 38. Connecting block; 39. Snap-fit ​​joint; 40. Third filter plate; 41. Cleaning strip. Detailed Implementation

[0034] To make the technical means, creative features, achieved objectives, and effects of this invention readily understandable, the invention is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention.

[0035] Given the rapid development of the industrial sector and the continuous expansion of production scale in various factories, the volume of industrial wastewater discharge is increasing daily, and its composition is becoming increasingly complex and diverse, posing a growing and more serious pollution problem to the environment. Many existing industrial wastewater filtration and purification technologies have significant defects and shortcomings. Traditional industrial wastewater filtration and purification devices mostly employ a single filtration method, which is insufficient to effectively address the filtration needs of impurities of different particle sizes in wastewater. For larger particles, the filter structure is easily clogged, leading to a sharp decline in filtration efficiency and even paralyzing the entire purification system. Furthermore, for fine particulate impurities and dissolved pollutants, a single filtration method often fails to effectively remove them, making it difficult for the purified wastewater to meet discharge standards or reuse requirements.

[0036] Furthermore, existing equipment lacks an efficient cleaning and maintenance mechanism. As the filtration process continues, impurities accumulate on the filter structure. If not cleaned in time, this not only further reduces filtration efficiency but also breeds bacteria and other microorganisms, producing odors and causing secondary pollution. Manual cleaning is not only labor-intensive and inefficient but can also damage the equipment due to improper operation, increasing maintenance costs. At the same time, existing equipment has a relatively limited purification function, unable to comprehensively treat multiple pollutants in wastewater, and thus fails to meet increasingly stringent environmental protection requirements and enterprises' demands for wastewater reuse.

[0037] This invention provides a high-efficiency filtration and purification device for industrial wastewater. This device, by incorporating a staged filtration mechanism on the filter cylinder 1 and an adsorption purification component at the bottom of the filter cylinder 1, effectively solves the problems in the prior art.

[0038] The graded filtration mechanism includes a primary filtration component and a secondary filtration component. The primary filtration component uses a second filter plate 36 to initially filter larger debris in the wastewater. The secondary filtration component uses a rotating cylinder 11 and a first filter plate 12 to dynamically filter smaller debris in the primary-treated wastewater. This achieves graded and efficient filtration of debris of different sizes in the wastewater, improving filtration efficiency and avoiding the problem of easy clogging in a single filtration structure. Simultaneously, an adsorption purification component is located at the bottom of the filter cylinder 1, which can further adsorb and purify the wastewater after secondary filtration, effectively removing dissolved pollutants and fine particulate impurities, ensuring that the purified wastewater meets discharge standards or reuse requirements. Furthermore, the device is equipped with a first cleaning component for the primary filtration component and a second cleaning component for the secondary filtration component, enabling automatic cleaning of the filtration structure. This reduces the frequency and workload of manual cleaning, lowers labor costs, ensures cleaning effectiveness, and extends the service life of the device. It has many advantages, including reasonable structure, convenient operation, and good purification effect, and can meet the actual needs of efficient filtration and purification of industrial wastewater.

[0039] Example 1: Reference Figures 1-9 The illustrated high-efficiency industrial wastewater filtration and purification device includes a filter cylinder 1, a graded filtration mechanism disposed on the filter cylinder 1, and an adsorption purification component disposed at the bottom of the filter cylinder 1 for purifying the filtered wastewater. The graded filtration mechanism includes a primary filtration component for static filtration of impurities in the wastewater and a secondary filtration component for dynamic filtration of impurities in the primary-treated wastewater. The primary and secondary filtration components are sequentially disposed on the filter cylinder 1, achieving graded filtration by the sequential flow of wastewater through them; the adsorption purification component is disposed at the bottom of the filter cylinder 1 and comes into contact with the secondary-filtered wastewater inside the filter cylinder 1 for purification; a drain pipe 3, communicating with the interior of the filter cylinder 1, is disposed on the side of the bottom of the filter cylinder 1.

[0040] The primary filtration assembly includes a second filter plate 36 located at the top of the filter cartridge 1 for preliminary filtration of wastewater and debris entering the secondary filtration assembly. See [link to relevant documentation]. Figure 8 The secondary filtration assembly includes a rotating cylinder 11 coaxially inserted into the filter cylinder 1 via a rotating assembly, and a first filter plate 12 mounted on a mounting port on the side of the rotating cylinder 11. (See [link to relevant documentation]). Figure 2 .

[0041] During industrial wastewater filtration and purification, the wastewater passes through the second filter plate 36 to initially filter larger debris. The filtered wastewater then flows into the rotating cylinder 11. The rotating component drives the rotating cylinder 11 to rotate, accelerating the flow of wastewater through the first filter plate 12 installed on the side of the rotating cylinder 11 to filter smaller debris. The debris is then collected at the bottom of the filter cylinder 1, where the adsorption and purification component further adsorbs and purifies the wastewater.

[0042] In this embodiment, when filtering and purifying wastewater, the wastewater first passes through the second filter plate 36 in the primary filtration assembly located at the top of the filter cylinder 1. The second filter plate 36 performs preliminary static filtration on larger debris in the wastewater, intercepting these debris and allowing the pre-filtered wastewater to flow into the rotating cylinder 11 in the secondary filtration assembly. At this time, the rotating cylinder 11, coaxially inserted into the filter cylinder 1 via the rotating assembly, begins to rotate under the drive of the rotating assembly. The rotating cylinder 11 accelerates the speed at which the wastewater passes through the first filter plate 12 installed on its side mounting port. The first filter plate 12 performs dynamic filtration on smaller debris in the wastewater after primary filtration. The wastewater after secondary filtration collects at the bottom of the filter cylinder 1. Finally, the adsorption purification assembly located at the bottom of the filter cylinder 1 comes into contact with the wastewater collected at the bottom, further adsorbing and purifying the wastewater to remove dissolved pollutants and fine particulate impurities. This device, through the synergistic effect of the graded filtration mechanism and the adsorption purification assembly, achieves graded and efficient filtration of debris of different sizes in industrial wastewater and deep purification of wastewater, improving filtration efficiency and ensuring that the purified wastewater meets discharge standards or reuse requirements.

[0043] This embodiment presents a staged filtration method for industrial wastewater. Most existing industrial wastewater filtration technologies employ a single filtration structure or a simple multi-stage filtration approach. Single filtration structures often only filter impurities within a specific particle size range, resulting in unsatisfactory filtration performance when faced with complex compositions and varying particle sizes in industrial wastewater. Some traditional filtration devices rely solely on fixed filter screens, which are easily clogged by larger particles, leading to a sharp decrease in filtration speed and even causing the entire filtration system to malfunction. Conversely, fixed filter screens are ineffective at intercepting fine particles, leaving the filtered wastewater still containing significant amounts of pollutants, failing to meet discharge standards or reuse requirements.

[0044] While existing simple multi-stage filtration methods improve filtration efficiency to some extent, they lack synergy between filtration stages and typically employ static filtration. During static filtration, impurities easily accumulate on the filter structure surface, forming a filter cake layer. This not only increases filtration resistance and reduces filtration efficiency but also requires frequent shutdowns for cleaning or replacement of filter components, increasing operating costs and labor intensity. Furthermore, existing technologies have limited ability to remove dissolved pollutants from wastewater, making it difficult to achieve deep wastewater purification.

[0045] In comparison, this technical solution has significant technical advantages:

[0046] This device features a tiered filtration system, including a primary filtration module and a secondary filtration module. The primary filtration module uses a second filter plate 36 to perform preliminary static filtration of larger debris in the wastewater, effectively intercepting larger particles that could clog subsequent filtration structures, thus creating favorable conditions for secondary filtration. The secondary filtration module employs a dynamic filtration method. A rotating component drives a rotating cylinder 11, causing wastewater to quickly pass through the first filter plate 12, efficiently filtering smaller debris. This tiered filtration system, combining static and dynamic filtration, fully leverages the advantages of each stage, achieving comprehensive and efficient filtration of debris of different sizes in wastewater, significantly improving filtration efficiency compared to existing technologies. The dynamic filtration mode of the secondary filtration module is a major innovation of this technical solution. The rotation of the rotating cylinder 11 creates flow and agitation in the wastewater during filtration, preventing impurities from uniformly accumulating on the surface of the first filter plate 12 to form a dense filter cake layer. Compared to existing static filtration technologies, this extends the service life of the filter plates and reduces maintenance costs.

[0047] In particular, the combination of tiered filtration and dynamic filtration breaks away from the traditional single-stage or simple multi-stage static filtration model in wastewater filtration technology. This innovative concept provides new ideas and methods for the field of industrial wastewater filtration, effectively solving problems such as low filtration efficiency and easy clogging in existing technologies, demonstrating significant technological progress. Furthermore, the design of the rotating cylinder 11 and the first filter plate 12 in the secondary filtration assembly, along with the coordination of the rotating components, forms a unique dynamic filtration structure. This structure achieves efficient filtration of small-sized impurities in wastewater and self-cleaning of the filter plates through the centrifugal force, flow, and agitation generated by rotation. This embodiment not only achieves tiered and efficient filtration of impurities of different sizes in wastewater but also deeply purifies the wastewater through adsorption purification components, resulting in a comprehensive purification effect significantly superior to existing technologies. This comprehensive purification capability can meet increasingly stringent environmental protection requirements and the needs of enterprises for wastewater reuse, possessing significant practical application value and market prospects.

[0048] like Figure 1 , Figure 2 and Figure 8As shown, the primary filtration assembly also includes an inlet tank 8 installed on the top of the filter cartridge 1, an inlet pipe 10 disposed on the top of the inlet tank 8, a connecting pipe 2 whose bottom end extends into the filter cartridge 1 and whose top end passes through the bottom side of the inlet tank 8, and a first cleaning component disposed in the inlet tank 8 to control the discharge of debris from the filter surface of the second filter plate 36. The filter surface at the top of the second filter plate 36 has a concave curved surface structure, and the second filter plate 36 is installed horizontally in the inlet tank 8.

[0049] In this embodiment, industrial wastewater first flows into the inlet tank 8 installed at the top of the filter cylinder 1 through the inlet pipe 10. At this time, the second filter plate 36, which is horizontally installed in the inlet tank 8 and has a concave curved surface structure at the top, begins to function. Larger debris in the wastewater is intercepted on the filter surface of the second filter plate 36. Due to the concave curved surface, the debris will gather towards the center of the curved surface under the action of gravity. The wastewater that has undergone preliminary filtration flows into the filter cylinder 1 through the connecting pipe 2 (whose bottom end extends into the filter cylinder 1 and its top end passes through the bottom side of the inlet tank 8) and enters the subsequent filtration process. As filtration continues, the debris accumulated on the filter surface of the second filter plate 36 gradually increases. At this time, the first cleaning component installed in the inlet tank 8 to control the discharge of debris from the filter surface of the second filter plate 36 is activated, discharging the debris accumulated on the filter surface of the second filter plate 36 from the inlet tank 8, ensuring that the second filter plate 36 can continuously and stably perform preliminary filtration of wastewater. The primary filtration component effectively guides the accumulation of debris through the concave curved surface structure of the second filter plate 36, improving the debris interception effect. At the same time, the first cleaning component cleans up debris in a timely manner, preventing debris from clogging the second filter plate 36 and ensuring the smooth progress of the initial filtration of sewage. This provides a strong guarantee for the subsequent secondary filtration and overall purification effect.

[0050] Example 2: For industrial wastewater, the second filter plate 36 filters larger debris over a long period, leading to a buildup of debris and a decrease in its filtration efficiency. This example provides the following solution:

[0051] like Figure 8 As shown, the first cleaning component includes a drain plate 37 vertically disposed in the liquid inlet tank 8 and located in the middle of the second filter plate 36, a rotating rod rotatably disposed in the liquid inlet tank 8 and installed on the top side of the drain plate 37, and a first motor installed on the side of the liquid inlet tank 8 and whose output end controls the rotation of the rotating rod. The liquid inlet tank 8 has drain ports on the symmetrical sides of the second filter plate 36 for discharging debris from the second filter plate 36.

[0052] In this embodiment, industrial wastewater flows into the inlet tank 8 through the inlet pipe 10. The second filter plate 36, horizontally installed within the inlet tank 8 and with a concave curved top surface, immediately intercepts larger debris in the wastewater. As wastewater continues to flow in, debris gradually accumulates on the concave filter surface of the second filter plate 36. When the debris accumulates to a certain level, the first motor, located on the side of the inlet tank 8 and connected to the rotating rod at its output end, starts. Driven by the first motor, the rotating rod begins to rotate. Since the drain plate 37 is vertically positioned within the inlet tank 8 and located in the middle of the second filter plate 36, and the rotating rod rotates longitudinally through the inlet tank 8 and is mounted on the top side of the drain plate 37, the rotation of the rotating rod causes the drain plate 37 to rotate as well. During rotation, the drain plate 37 sweeps the debris accumulated on the concave filter surface of the second filter plate 36 towards the drain outlets on the symmetrical sides of the inlet tank 8 relative to the second filter plate 36. Finally, the debris is discharged into the liquid inlet tank 8 through the drain outlet, thus completing the cleaning of the debris on the filter surface of the second filter plate 36. This prevents the debris from accumulating on the second filter plate 36 for a long time and causing blockage, ensuring that the second filter plate 36 always maintains good filtration performance. This allows the sewage to pass smoothly through the second filter plate 36 for preliminary filtration, providing an important guarantee for the stable operation and high-efficiency filtration of the entire industrial wastewater high-efficiency filtration and purification device.

[0053] The waste discharge plate 37 cleans the debris on the second filter plate 36. This embodiment provides the following solution:

[0054] like Figure 8 and Figure 9 As shown, the end face of the drain plate 37 has a locking opening 39, a third filter plate 40 is installed in the locking opening 39, and a cleaning strip 41 that fits against the top filter surface of the second filter plate 36 is installed at the bottom of the drain plate 37.

[0055] In this embodiment, when debris accumulates on the second filter plate 36 and needs cleaning, the first motor starts, and its output drives the rotating rod to rotate. Since the drain plate 37 is installed in the inlet tank 8 via the rotating rod and is located in the middle of the second filter plate 36, the drain plate 37 will rotate along with the rotating rod. During the rotation of the drain plate 37, the third filter plate 40 installed in the locking opening 39 on the end face of the drain plate 37 also rotates. During the rotation of the third filter plate 40, on the one hand, it can play a secondary filtration role for the sewage, further intercepting some small debris that may pass through the second filter plate 36, improving the effect of the initial filtration; on the other hand, as the drain plate 37 sweeps the debris towards the drain outlet, the third filter plate 40 can prevent some debris from falling back onto the second filter plate 36 during the sweeping process, ensuring the efficiency of debris cleaning. At the same time, the cleaning strip 41 installed at the bottom of the drain plate 37 and in contact with the top filter surface of the second filter plate 36 plays an important role. As the drain plate 37 rotates, the cleaning strip 41 moves closely against the filter surface of the second filter plate 36, thoroughly cleaning away fine debris and dirt adhering to the filter surface of the second filter plate 36. As the drain plate 37 rotates, these debris are swept towards the drain outlet, and finally discharged into the liquid inlet tank 8 through the drain outlet. This facilitates a more thorough and efficient cleaning of debris on the second filter plate 36, effectively preventing clogging of the second filter plate 36 and ensuring that the second filter plate 36 can work continuously and stably, providing a strong guarantee for the efficient operation of the entire industrial wastewater high-efficiency filtration and purification device.

[0056] It is understandable that the debris on the second filter plate 36 can be discharged into the liquid tank 8 via the drain plate 37 in various ways. This embodiment provides the following solution:

[0057] like Figure 8 As shown, connecting blocks 38 are installed on the symmetrical sides of the liquid inlet tank 8 below the drain outlet opening. A collection block 9 is detachably installed on the connecting block 38, and a collection port communicating with the drain outlet is opened on the side of the collection block 9.

[0058] In this embodiment, when the first motor starts and drives the rotating rod to rotate, thereby causing the drain plate 37 to rotate, the drain plate 37 sweeps the debris on the second filter plate 36 towards the drain port opened on the symmetrical side of the liquid inlet tank 8. At this time, the connecting block 38 installed on the symmetrical side of the liquid inlet tank 8 below the drain port opening plays a key role. Since the collecting block 9 is detachably installed on the connecting block 38, and the collecting block 9 has a collecting port on its side that communicates with the drain port, the debris discharged from the drain port will enter the collecting block 9 through the collecting port. The collecting block 9 is like a "scratching box" that collects the cleaned debris, preventing the debris from scattering everywhere and keeping the environment around the liquid inlet tank 8 clean.

[0059] Example 3: Regarding the dynamic filtration of wastewater after static filtration by the primary filtration component using the secondary filtration component in Example 1, this example provides the following solution.

[0060] like Figure 1 , Figure 2 and Figure 4 As shown, the secondary filtration assembly also includes a second motor installed on the bottom of the filter cylinder 1 and whose output end passes through the filter cylinder 1 to control the rotation of the rotating cylinder 11; a limiting ring 13 fixedly installed on the top side of the rotating cylinder 11 and having an annular limiting groove 14 on the side; multiple limiting wheels 15 arranged in a circumferential array on the inner wall of the filter cylinder 1; and a second cleaning component installed on the filter cylinder 1 and controlling the discharge of debris from the filter surface of the first filter plate 12 inside the rotating cylinder 11. The limiting wheels 15 all pass through the limiting groove 14.

[0061] In this embodiment, the second motor is installed at the bottom of the filter cylinder 1, and its output end passes through the interior of the filter cylinder 1 and is connected to the rotating cylinder 11. When the second motor is started, the output end drives the rotating cylinder 11 to start rotating. During the rotation of the rotating cylinder 11, a limiting ring 13 is fixedly installed on its top side, and a limiting groove 14 with an annular structure is opened on the side of the limiting ring 13. At the same time, multiple limiting wheels 15 are installed in a circumferential array on the inner wall of the filter cylinder 1 and pass through the limiting groove 14, thus forming a stable limiting structure. The limiting wheels 15 roll in the limiting groove 14, which can ensure that the rotating cylinder 11 rotates smoothly and steadily under the drive of the second motor, and can also prevent the rotating cylinder 11 from deviating or shaking during the rotation, thus ensuring the stability of the entire secondary filtration assembly. As the rotating cylinder 11 rotates, the first filter plate 12 installed in the rotating cylinder 11 also rotates. Under pressure, the sewage passes quickly through the first filter plate 12, which efficiently filters the smaller impurities in the sewage. Because it is a dynamic filtration process, the scouring force generated by the flowing sewage and the centrifugal force generated by the rotation of the rotating cylinder 11 prevent debris from uniformly accumulating on the surface of the first filter plate 12 to form a dense filter cake layer, reducing the possibility of filter plate clogging. However, during the long-term filtration process, some debris will still adhere to the filter surface of the first filter plate 12. At this time, the second cleaning component, installed on the filter cylinder 1 and used to control the discharge of debris from the filter surface of the first filter plate 12 inside the rotating cylinder 11, begins to work. The second cleaning component cleans the debris on the filter surface of the first filter plate 12 according to a preset program or under the control of the operator, removing the debris from the first filter plate 12 and discharging it from the filter cylinder 1, ensuring that the first filter plate 12 always maintains good filtration performance, thereby continuously and efficiently performing secondary filtration of sewage.

[0062] It is understood that debris on the filter surface of the first filter plate 12 can be cleaned in various ways. This embodiment provides the following solution:

[0063] like Figure 1 , Figure 2 and Figure 4 As shown, the second cleaning component includes a cleaning disc 16 that passes through the rotating cylinder 11 and slides against the inner wall of the rotating cylinder 11; a lifting structure that is set on the filter cylinder 1 and controls the cleaning disc 16 to move up and down within the filter cylinder 1; multiple cleaning brushes 27 arranged in a circumferential array within cleaning grooves 28 on the side of the cleaning disc 16; a control structure that is installed on the cleaning disc 16 and controls the multiple cleaning brushes 27 to move to fit against the inner wall of the rotating cylinder 11; and a waste discharge structure set on the cleaning disc 16 to discharge debris from the cleaning grooves 28 into the filter cylinder 1. A through-hole 24 is provided at the top of the cleaning disc 16 below the end of the connecting pipe 2.

[0064] In this embodiment, when cleaning debris from the filter surface of the first filter plate 12, the lifting structure on the filter cylinder 1 is activated, causing the cleaning disc 16, which is inserted into the rotating cylinder 11 and slidably attached to the inner wall of the rotating cylinder 11, to move up and down within the filter cylinder 1. During the lifting and lowering of the cleaning disc 16, since the top of the cleaning disc 16 has a through-hole 24 located below the end of the connecting pipe 2, sewage can continue to flow normally through the through-hole 24 without affecting the sewage filtration process. When the cleaning disc 16 reaches the corresponding position, the control structure installed on the cleaning disc 16 starts to work. The control structure controls the movement of multiple cleaning brushes 27 arranged in a circumferential array within cleaning grooves 28 on the side of the cleaning disc 16, so that the cleaning brushes 27 are in contact with the inner wall of the rotating cylinder 11. At this time, as the rotating cylinder 11 continues to rotate, the cleaning brushes 27 perform all-round cleaning of the inner wall of the rotating cylinder 11, brushing the debris adhering to the inner wall into the cleaning grooves 28. Simultaneously, during the lifting and lowering of the cleaning disc 16, the cleaning brush 27 also cleans the filter surface of the first filter plate 12, further removing debris from the filter surface and ensuring the filtration effect of the first filter plate 12. After a certain amount of debris accumulates in the cleaning tank 28, the waste discharge structure set on the cleaning disc 16 is activated. The waste discharge structure discharges the debris in the cleaning tank 28 into the filter cylinder 1, preventing debris from accumulating in the cleaning tank 28 and affecting the normal operation of the cleaning brush 27 and the operation of the entire secondary filtration assembly.

[0065] It is understood that the cleaning disc 16 can move up and down within the rotating cylinder 11 in various ways. This embodiment provides the following solution:

[0066] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the lifting structure includes a cleaning rod 4 that moves axially through the top of the filter cylinder 1 and is mounted on the top of the cleaning disc 16 at its bottom end; a lifting rack 5 that is mounted on the cleaning rod 4 along its length; and a third motor that is mounted on the top of the filter cylinder 1 and has a lifting gear 6 that meshes with the lifting rack 5 at its output end.

[0067] In this embodiment, when the cleaning function needs to be activated, the third motor receives a control signal and begins to operate. The output of the third motor drives the lifting gear 6 to rotate. Since the lifting gear 6 is tightly meshed with the lifting rack 5, according to the principle of gear transmission, the rotation of the lifting gear 6 will drive the lifting rack 5 to move linearly along its length. The lifting rack 5 is mounted on the cleaning rod 4, so the cleaning rod 4 will move along with the lifting rack 5 in the axial direction of the filter cylinder 1. Because the bottom end of the cleaning rod 4 is connected to the cleaning disc 16, the movement of the cleaning rod 4 will directly drive the cleaning disc 16 to move up and down within the filter cylinder 1.

[0068] It is understood that the cleaning of the inner wall of the rotating drum 11 by multiple cleaning brushes 27 can be achieved in various ways. This embodiment provides the following solution:

[0069] like Figures 2-5 As shown, the control structure includes an adjusting ring 17 movably sleeved on the cleaning rod 4, multiple adjusting blocks 26 corresponding to the cleaning brushes 27 near the center of the cleaning disc 16, multiple linkage rods 18 with one end rotatably mounted on the side of the adjusting ring 17 in a circumferential array and the other end rotatably connected to the top of different adjusting blocks 26, a lifting screw 21 vertically set on the top of the cleaning disc 16, and a lifting block 19 threadedly sleeved on the lifting screw 21 and installed on the adjusting ring 17. The lifting screw 21 is driven by a lifting motor 20 installed on the cleaning rod 4. The top of the adjusting block 26 passes through the top end face of the cleaning disc 16 and opens an adjusting port 25 above the cleaning disc 16. The length direction of the opening of the adjusting port 25 passes through the center of the top of the cleaning disc 16.

[0070] In this embodiment, when the cleaning brush 27 needs to be in contact with the inner wall of the rotating cylinder 11 for cleaning, the lifting motor 20 is activated. The output end of the lifting motor 20 drives the lifting screw 21 to rotate. Since the lifting block 19 is threadedly connected to the lifting screw 21, according to the principle of screw drive, the rotation of the lifting screw 21 causes the lifting block 19 to move linearly along the length of the lifting screw 21. Because the lifting block 19 is mounted on the adjusting ring 17, the adjusting ring 17 will move up or down on the cleaning rod 4 along with the lifting block 19 (the specific direction depends on the direction of rotation of the lifting motor 20 and the device design). As the adjusting ring 17 moves, the linkage rod 18 begins to function. Since one end of the linkage rod 18 is connected to the adjusting ring 17 and the other end is connected to the adjusting block 26, the movement of the adjusting ring 17 will pull or push the adjusting block 26 within the adjusting port 25 through the linkage rod 18. The movement of the adjusting block 26 will then drive the cleaning brush 27 to move closer to or further away from the center of the cleaning disc 16. When the adjusting ring 17 moves to a suitable position in a certain direction, the cleaning brush 27 moves under the drive of the linkage rod 18 until it is in close contact with the inner wall of the rotating cylinder 11. After the cleaning brush 27 is in contact with the inner wall of the rotating cylinder 11, as the cleaning disc 16 moves up and down under the action of the lifting structure, and the rotating cylinder 11 continues to rotate under the drive of the second motor, the cleaning brush 27 acts like a series of efficient "brushes" to thoroughly clean the inner wall of the rotating cylinder 11, brushing the debris adhering to the inner wall into the cleaning groove 28 on the side of the cleaning disc 16. At the same time, the cleaning brush 27 also cleans the filter surface of the first filter plate 12 to ensure the filtration effect of the first filter plate 12. When the cleaning work is completed, the lifting motor 20 rotates in the opposite direction, driving the lifting screw 21 to rotate in the opposite direction, thereby causing the lifting block 19 and the adjusting ring 17 to move in the opposite direction. The reverse movement of the adjusting ring 17 drives the adjusting block 26 and the cleaning brush 27 to move away from the inner wall of the rotating cylinder 11 via the linkage rod 18, so that the cleaning brush 27 separates from the inner wall of the rotating cylinder 11 and returns to the initial state, preparing for the next cleaning work.

[0071] Regarding the discharge of debris after cleaning by the first filter plate 12 within the cleaning tank 28, this embodiment provides the following solution:

[0072] like Figures 4-7As shown, the waste discharge structure includes a cleaning pipe 7 horizontally positioned at the top of the cleaning rod 4 and having a conveying channel inside the cleaning rod 4; a partition strip 35 extending along the length of the cleaning rod 4 through the conveying channel and having its top inserted into the cleaning pipe 7; a discharge ring 31 installed on the bottom of the cleaning disc 16 and having a discharge groove 32 at its top that communicates with the discharge port 30; a connecting disc located within the inner ring of the discharge ring 31; and multiple circular arrays arranged within the discharge ring 31, with both ends connected to the connecting disc and the discharge ring 31 respectively. The top of the connecting plate of the pipe 33 is provided with a cleaning port 34 that is connected to one of the channels of the conveying channel separated by the partition strip 35. The other channel of the conveying channel separated by the partition strip 35 is connected to the liquid inlet 29 opened on the bottom wall of the cleaning tank 28. The cleaning tank 28 is provided with a discharge port 30 near the bottom inner wall of the cleaning plate 16. The end face of the cleaning plate 16 is provided with a through port 22, which is divided into two openings by the partition plate 23, each connected to a different channel. The two openings are connected to the liquid inlet 29 and the cleaning port 34, respectively.

[0073] In this embodiment, during operation of the waste discharge structure, cleaning liquid is first injected into the inlet tank 29 through a channel separated by the partition strip 35 and communicating with the inlet tank 29 at the bottom wall of the cleaning tank 28. After the cleaning liquid enters the inlet tank 29, the debris accumulated in the cleaning tank 28 will flow along with the liquid through the discharge port 30 into the discharge tank 32 opened at the top of the discharge ring 31. Since multiple discharge pipes 33 are arranged in a circular array inside the discharge ring 31, with both ends connected to the connecting plate and the discharge ring 31 respectively, the debris and liquid mixture entering the discharge tank 32 will be collected into the connecting plate through these discharge pipes 33. A cleaning port 34 is opened at the top of the connecting plate, communicating with another channel in the conveying channel separated by the partition strip 35. The debris and liquid mixture collected in the connecting plate will be discharged into this channel through the cleaning port 34, and finally discharged out of the filter cartridge 1 through the cleaning pipe 7 horizontally set at the top of the cleaning rod 4 and communicating with the conveying channel inside. Through ingenious channel design and liquid-driven principle, the debris accumulated in the cleaning tank 28 can be discharged from the filter cartridge 1 efficiently and smoothly, avoiding the accumulation of debris in the cleaning tank 28 that would affect the normal operation of the cleaning brush 27 and the secondary filtration effect, thus ensuring the stable operation of the secondary filtration stage of the entire industrial wastewater high-efficiency filtration and purification device.

[0074] The adsorption purification component includes multiple activated carbon adsorption blocks stacked at the bottom of the filter cylinder 1. Industrial wastewater enters the activated carbon adsorption block layer and flows evenly from top to bottom through the blocks under gravity. Organic matter and odor substances in the wastewater are adsorbed by the pores on the surface of the activated carbon, thus achieving wastewater purification. The purified wastewater is discharged from the effluent pipe and enters subsequent treatment stages.

[0075] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency industrial wastewater filtration and purification device, comprising a filter cylinder (1), a staged filtration mechanism disposed on the filter cylinder (1), and an adsorption purification component disposed at the bottom of the filter cylinder (1) for purifying the filtered wastewater, characterized in that, The graded filtration mechanism includes a primary filtration component for static filtration of impurities in wastewater and a secondary filtration component for dynamic filtration of impurities in wastewater after primary treatment. The primary and secondary filtration components are sequentially arranged on the filter cylinder (1) and graded filtration is achieved by the wastewater flowing through them sequentially. The adsorption and purification component is arranged at the bottom of the filter cylinder (1) and comes into contact with the wastewater after secondary filtration in the filter cylinder (1) for purification. The primary filtration assembly includes a second filter plate (36) located at the top of the filter cylinder (1) for preliminary filtration of sewage and debris entering the secondary filtration assembly. The secondary filtration assembly includes a rotating cylinder (11) coaxially inserted into the filter cylinder (1) via a rotating assembly, and a first filter plate (12) installed on the side of the rotating cylinder (11) with an installation port. During industrial wastewater filtration and purification, the wastewater passes through the second filter plate (36) to initially filter larger debris. The filtered wastewater flows into the rotating cylinder (11). The rotating component drives the rotating cylinder (11) to rotate, accelerating the passage of the wastewater through the first filter plate (12) installed on the side of the rotating cylinder (11) to filter smaller debris in the wastewater. The debris is collected at the bottom of the filter cylinder (1), and the adsorption purification component further adsorbs and purifies the wastewater.

2. The high-efficiency industrial wastewater filtration and purification device according to claim 1, characterized in that: The primary filtration assembly also includes an inlet tank (8) installed on the top of the filter cartridge (1), an inlet pipe (10) set on the top of the inlet tank (8), a connecting pipe (2) with its bottom end extending into the filter cartridge (1) and its top end passing through the bottom side of the inlet tank (8), and a first cleaning component set in the inlet tank (8) to control the discharge of debris from the filter surface of the second filter plate (36) into the inlet tank (8). The filter surface at the top of the second filter plate (36) has a concave curved structure, and the second filter plate (36) is installed horizontally in the inlet tank (8).

3. The high-efficiency industrial wastewater filtration and purification device according to claim 2, characterized in that: The first cleaning component includes a drain plate (37) vertically arranged inside the liquid inlet tank (8) and located in the middle of the second filter plate (36), a rotating rod rotatably inserted through the liquid inlet tank (8) and installed on the top side of the drain plate (37), and a first motor installed on the side of the liquid inlet tank (8) and whose output end controls the rotation of the rotating rod. The liquid inlet tank (8) has drain ports on the symmetrical sides of the second filter plate (36) for discharging debris from the second filter plate (36).

4. The high-efficiency industrial wastewater filtration and purification device according to claim 3, characterized in that: The end face of the drain plate (37) is provided with a snap-fit ​​opening (39), and a third filter plate (40) is installed inside the snap-fit ​​opening (39). A cleaning strip (41) that is attached to the top filter surface of the second filter plate (36) is installed at the bottom of the drain plate (37).

5. The high-efficiency industrial wastewater filtration and purification device according to claim 3, characterized in that: Connecting blocks (38) are installed on the symmetrical sides of the liquid inlet tank (8) below the drain outlet. A collection block (9) is detachably installed on the connecting block (38). A collection port that communicates with the drain outlet is opened on the side of the collection block (9).

6. The industrial wastewater high-efficiency filtration and purification device according to any one of claims 2 to 5, characterized in that: The secondary filtration assembly also includes a second motor installed on the bottom of the filter cylinder (1) and whose output end passes through the filter cylinder (1) to control the rotation of the rotating cylinder (11), a limiting ring (13) fixedly installed on the top side of the rotating cylinder (11) and with an annular limiting groove (14) on the side, multiple limiting wheels (15) installed in a circumferential array on the inner wall of the filter cylinder (1), and a second cleaning component installed on the filter cylinder (1) to control the discharge of debris from the filter surface of the first filter plate (12) inside the rotating cylinder (11) to the filter cylinder (1). The limiting wheels (15) all pass through the limiting groove (14).

7. The high-efficiency industrial wastewater filtration and purification device according to claim 6, characterized in that: The second cleaning component includes a cleaning disc (16) that passes through the rotating cylinder (11) and slides against the inner wall of the rotating cylinder (11) on its side; a lifting structure that is set on the filter cylinder (1) and controls the cleaning disc (16) to move up and down in the filter cylinder (1); multiple cleaning brushes (27) arranged in a circular array in the cleaning grooves (28) on the side of the cleaning disc (16); a control structure that is installed on the cleaning disc (16) and controls the multiple cleaning brushes (27) to move to fit against the inner wall of the rotating cylinder (11); and a waste discharge structure set on the cleaning disc (16) to discharge debris from the cleaning grooves (28) into the filter cylinder (1). The top of the cleaning disc (16) is provided with a through-hole (24) located below the end of the connecting pipe (2).

8. The high-efficiency industrial wastewater filtration and purification device according to claim 7, characterized in that: The lifting structure includes a cleaning rod (4) that moves axially through the top of the filter cylinder (1) and is mounted at the bottom of the cleaning disc (16), a lifting rack (5) mounted on the cleaning rod (4) along the length direction, and a third motor mounted on the top of the filter cylinder (1) and having a lifting gear (6) that meshes with the lifting rack (5) mounted at the output end.

9. The high-efficiency industrial wastewater filtration and purification device according to claim 8, characterized in that: The control structure includes an adjustment ring (17) movably sleeved on the cleaning rod (4), multiple adjustment blocks (26) corresponding to the cleaning brushes (27) near the center of the cleaning disc (16), multiple linkage rods (18) with one end arranged in a circular array and rotatably installed on the side of the adjustment ring (17) and the other end correspondingly rotatably connected to the top of different adjustment blocks (26), a lifting screw (21) vertically set on the top of the cleaning disc (16), and a lifting block (19) threadedly sleeved on the lifting screw (21) and installed on the adjustment ring (17). The lifting screw (21) is driven by a lifting motor (20) installed on the cleaning rod (4). The top of the adjustment block (26) passes through the top end face of the cleaning disc (16) and opens an adjustment port (25) above the cleaning disc (16). The opening length of the adjustment port (25) passes through the center of the top of the cleaning disc (16).

10. The high-efficiency industrial wastewater filtration and purification device according to claim 9, characterized in that: The waste discharge structure includes a cleaning pipe (7) that is horizontally arranged on the top of the cleaning rod (4) and has a conveying channel inside the cleaning rod (4); a partition strip (35) that runs through the conveying channel along the length of the cleaning rod (4) and has its top end inside the cleaning pipe (7); a discharge ring (31) that is installed on the bottom of the cleaning pan (16) and has a discharge groove (32) that runs through the discharge port (30); a connecting plate that is set in the inner ring of the discharge ring (31); and a discharge pipe (33) that is arranged in a circumferential array inside the discharge ring (31) and has its two ends connected to the connecting plate and the discharge ring (31) respectively. The top of the connecting plate has a cleaning port (34) that runs through one of the channels of the conveying channel separated by the partition strip (35). The other channel of the conveying channel separated by the partition strip (35) runs through the liquid inlet groove (29) opened on the bottom wall of the cleaning tank (28). The cleaning tank (28) has a discharge port (30) near the bottom inner wall of the cleaning pan (16).

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