Sewage treatment trash rack with self-cleaning function

Abstract

The sewage treatment trash rack with the self-cleaning function comprises a first side wall and a second side wall which are oppositely arranged, a flow channel is formed between the first side wall and the second side wall, and a first filter plate, a second filter plate and a grid plate assembly are sequentially arranged in the flow channel in the water flow direction; a plurality of first filter holes and a plurality of second filter holes are respectively formed in the first filter plate and the second filter plate, and a first cleaning piece and a second cleaning piece are respectively arranged on the opposite side surfaces of the first filter plate and the second filter plate; the first filter plate is externally connected with a driving assembly. Through the synergistic effect of a multi-stage filtering structure, a dynamic adjusting mechanism and a self-cleaning function, the efficiency of intercepting suspended solids and impurities in the sewage treatment process is remarkably improved, and meanwhile, the equipment blockage and maintenance frequency is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of sewage treatment, and relates to a sewage treatment is stopped up grid with self -cleaning function. BACKGROUND

[0002] As the first physical barrier of the sewage treatment system, the trash rack is widely used in municipal pipe network, sewage treatment plant and industrial wastewater treatment facilities, and its core function is to intercept suspended solid pollutants (such as plastic, branch, fiber, etc.) in water through the gap of the rack, so as to protect the subsequent water pump, pipeline and treatment equipment from being blocked. The traditional trash rack adopts fixed rack or rotary mechanical grating structure, and relies on manual cleaning or mechanical rake teeth to cooperate with high-pressure water jet to realize periodic cleaning. However, the existing technology has exposed significant defects in actual operation: because the pollutants on the rack surface are easy to accumulate quickly and are unevenly distributed, the water flow resistance increases and the water passing efficiency decreases, and the mechanical cleaning device has the problems of many cleaning dead angles and high energy consumption, for example, the water consumption of high-pressure water jet for single cleaning can reach more than 0.5 tons, and the long-term operation is poor in economy. In addition, under some working conditions, corrosive substances (such as acidic wastewater) or low-temperature icing environment will cause the deformation of the rack and the jamming of the cleaning mechanism, further increasing the maintenance cost. Although in recent years some researches have tried to improve the performance of the trash rack by optimizing the rack spacing, adding vibration modules or improving the corrosion resistance of the material, but there is still no systematic solution in terms of self-cleaning efficiency, energy saving and environmental protection, and adaptability to complex environment. SUMMARY

[0003] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a trash rack for sewage treatment with self-cleaning function. The utility model significantly improves the interception efficiency of suspended solids and impurities in the sewage treatment process through the synergistic effect of the multi-stage filtration structure, dynamic adjustment mechanism and self-cleaning function, and effectively reduces the equipment blockage and maintenance frequency. The core design is to convert the single filtration mode of the traditional trash rack into a system combining graded filtration and dynamic adjustment, and to realize the self-cleaning function through mechanical linkage, which has high practicability and innovation.

[0004] To achieve this purpose, the utility model adopts the following technical scheme:

[0005] The utility model provides a trash rack for sewage treatment with self-cleaning function, which comprises first and second side walls arranged oppositely, a flow channel is formed between the first and second side walls, and first and second filter plates and a rack plate assembly are arranged in the flow channel in sequence along the water flow direction.

[0006] The first filter plate and the second filter plate are respectively provided with a plurality of first filter holes and a plurality of second filter holes, and the opposite sides of the first filter plate and the second filter plate are respectively provided with a first cleaning member and a second cleaning member, and the first cleaning member and the second cleaning member are respectively aligned with the second filter holes and the first filter holes;

[0007] The first filter plate is provided with a driving assembly, and the driving assembly is used for driving the first filter plate to move towards the second filter plate, so that the first cleaning member and the second cleaning member are respectively inserted into the second filter holes and the first filter holes.

[0008] The utility model discloses a multistage filter structure, dynamic adjustment mechanism and the synergies of self-cleaning function, significantly improve the interception efficiency of suspended solids and impurities in the sewage treatment process, and effectively reduce the equipment jam and maintenance frequency. Its core design is in the single filter mode of traditional trash rack is converted into the system that the combination of grading filtration and dynamic adjustment, and realizes the self-cleaning function through mechanical linkage, has higher practicality and innovativeness.

[0009] Firstly, the trash rack provided by the utility model adopts a three-stage filter structure, and a progressive filter level is formed through the combined design of the first filter plate, the second filter plate and the grid plate assembly. The cylindrical through hole of the first filter plate can intercept larger particle pollutants, and the circular truncated cone through hole of the second filter plate further filters small impurities through the tapered structure. This gradient filtration design not only improves the interception efficiency, but also reduces the risk of single aperture blockage through the difference in hole type. In addition, the opposite surfaces of the first filter plate and the second filter plate are respectively provided with a first cleaning member and a second cleaning member which can be inserted into the filter holes (the first filter holes and the second filter holes) of the other party. When the driving assembly drives the first filter plate to move, the first cleaning member and the second cleaning member can penetrate into the first filter holes and the second filter holes to remove the attached dirt, realizing bidirectional self-cleaning. This mechanical scraping type cleaning method is more thorough than the traditional water flushing or manual cleaning, especially for the removal of fiber or sticky dirt, and can effectively avoid the problems of secondary pollution or increased energy consumption caused by high-pressure water flow flushing.

[0010] Secondly, the innovative design of the grid plate assembly breaks through the limitations of traditional fixed grid plates. By alternately arranging fixed grid plates and rotating grid plates, and configuring a rotating assembly controlled by a gear transmission system, the entire grid plate assembly has a dynamic flow adjustment function. When the sewage flow or pollutant type changes, the gap width between the fixed grid plate and the rotating grid plate can be adjusted by rotating the rotating grid plate, which can adapt to the filtering needs under different working conditions and can also expand the gap to speed up the discharge of pollutants in the cleaning mode. This adjustability improves the adaptability of the equipment to different water quality conditions. In addition, the synchronous rotating action of the rotating grid plate is realized through the precise cooperation of the transmission shaft and the gear set, and the modular structure design not only ensures the synchronicity and reliability of the action, but also facilitates later maintenance and component replacement.

[0011] Thirdly, the optimized design of the driving assembly provides a guarantee for the efficient operation of the entire device. The movement of the first filter plate is realized through a double-screw rod transmission mechanism, and the synchronous rotation under the drive of the servo motor ensures the stability and positioning accuracy of the movement of the first filter plate, so that the cleaning member can be accurately inserted into the filter hole of the opposite member. At the same time, the self-locking property of the screw rod mechanism can also maintain the stable position of the filter plate in the non-working state, avoiding displacement deviation caused by water flow impact. In addition, the rotating drive of the grid plate assembly adopts an overhead transmission layout, which effectively utilizes the space above the flow channel and avoids the corrosion problem caused by the contact between the transmission components and the sewage, significantly prolonging the service life of the key moving parts.

[0012] The pollution blocking grid provided by the utility model realizes functional integration through structural innovation, and the cooperative mechanism of hierarchical filtration and self-cleaning enables the device to continuously maintain an efficient filtration state during operation, solving the problems of easy blocking, difficult maintenance, poor adaptability and other pain points of traditional pollution blocking grids. The dynamically adjustable grid plate assembly gives the device flexibility to cope with complex working conditions, such as temporarily expanding the grid plate gap to cope with large flow impact during heavy rain period, and reducing the gap to improve the interception accuracy during daily operation, which not only improves the sewage treatment efficiency, but also significantly reduces the energy consumption and the need for manual intervention, and has a wide application prospect in the fields of municipal sewage treatment and industrial wastewater treatment. Especially for sewage scenes containing fiber, hair and other easily entangled impurities, its self-cleaning function and anti-blocking design show unique technical advantages.

[0013] As a preferred technical solution of the utility model, the grid plate assembly is perpendicular to the water flow direction in the flow channel, and the grid plate assembly is composed of a plurality of grid plates, including a plurality of fixed grid plates and a plurality of rotating grid plates located in the same plane, and the fixed grid plates and the rotating grid plates are alternately arranged along the horizontal direction.

[0014] In some optional examples, the rotating grate is in driving connection with a rotating assembly, the rotating assembly being configured to drive the rotating grate to rotate along the vertical axis thereof, so that the gap is formed between the fixed grate and the rotating grate.

[0015] The fixed grate and the rotating grate are integrated in the same plane in a horizontal alternating manner, and a rotating assembly is introduced, so that a dynamically adjustable grate assembly is constructed, which can significantly improve the filtering efficiency, enhance the anti-blocking capability, and optimize the equipment adaptability.

[0016] In the first aspect, the grate assembly provided by the utility model breaks through the rigidity limitation of the traditional fixed grate of the trash screen, and the fixed grate and the rotating grate are arranged in a horizontal alternating manner, so that the gap width between adjacent grates can be dynamically adjusted through the rotation of the rotating grate around the vertical axis. This design cleverly realizes the active control of the grate gap. Under the conventional filtering condition, the rotating grate can be adjusted to closely contact the fixed grate, so as to form a uniform narrow gap to intercept small suspended solids. When a large amount of easily blocked substances (such as branches, plastic bags, etc.) appear in the sewage or a sudden large flow impact needs to be coped with, the gap can be expanded through the rotating grate, so that the accumulated substances can be quickly released, and the water flow resistance caused by local blockage can be avoided. The dynamic adjustment capability enables the equipment to optimize the filtering precision and water efficiency in real time according to the actual water quality and flow change, and significantly improves the working condition adaptability of the trash screen.

[0017] In the second aspect, in terms of anti-blocking and self-cleaning functions, the periodic rotating action of the rotating grate itself also constitutes a mechanical cleaning method. When the rotating grate rotates around the vertical axis, the relative movement is generated between the edge of the rotating grate and the fixed grate. This movement can form a continuous scraping action on the viscous pollutants (such as oil and algae) adhered to the surface of the grate, and effectively destroy the adhesion state of the pollutants. At the same time, the dynamic change of the gap width during the rotation will disturb the pollutants trapped in the gap between the fixed grate and the rotating grate, so that the pollutants are more easily detached under the action of gravity or water flow. Compared with the passive cleaning method of the traditional trash screen relying on manual rake cleaning or high-pressure water washing, this self-cleaning mechanism integrated in the operation process of the equipment greatly reduces the maintenance frequency and the need for manual intervention. Especially when dealing with hair, fiber and other easily entangled substances, the rotating action of the rotating grate can actively cut off the entangled material, so that the difficult-to-remove pollutant block is avoided.

[0018] In a third aspect, the rotating shaft is vertically arranged and rotates about the vertical axis thereof, and the rotating plane of the rotating grid plate is perpendicular to the water flow direction, thereby avoiding the secondary accumulation of dirt caused by horizontal rotation, fully utilizing the flow passage space, and making the overall structure of the device more compact. The fixed grid plate and the rotating grid plate are arranged in the same plane, which ensures the stability of the flow state when the water flows through the grid plate assembly, reduces the generation of turbulence, and thus reduces the risk of dirt resuspension caused by water flow disturbance. In addition, the fixed grid plate in the utility model bears the main structural support function, and the rotating grid plate focuses on dynamic adjustment, which improves the modularity of the grid plate assembly. When an individual rotating grid plate needs to be repaired due to mechanical failure, it can be individually disassembled and replaced without affecting the operation of the overall grid plate assembly, significantly shortening the equipment maintenance downtime, which is particularly important for sewage treatment systems that need to be continuously operated.

[0019] In a fourth aspect, the utility model realizes the balanced optimization of filtering efficiency and energy consumption through the structural innovation of the fixed grid plate and the rotating grid plate. The traditional fixed grid plate will cause the contraction of the water passage section when dirt accumulates, resulting in an increase in the energy consumption of the pump station with the increase in the degree of blockage. In the utility model, the dynamic adjustment function of the rotating grid plate can actively maintain the optimal water passage section, and cooperate with the self-cleaning function to reduce the retention of dirt, thereby maintaining a low water flow resistance in long-term operation. In addition, the driving torque required for vertical shaft rotation is small, and in combination with a precise transmission mechanism, reliable gap adjustment can be achieved under low power consumption conditions, meeting the urgent needs of the sewage treatment industry for energy-saving equipment.

[0020] As a preferred technical solution of the utility model, the two grid plates close to the first side wall and the second side wall in the grid plate assembly are both fixed grid plates, the number of the fixed grid plates = the number of the rotating grid plates + 1, and the number of the fixed grid plates is 6-10, for example, which can be 6, 7, 8, 9 or 10, but is not limited to the listed values, and other unlisted values within the value range are also applicable.

[0021] In some optional examples, the fixed grid plate and the rotating grid plate are both rectangular and have the same size, and the width of the fixed grid plate and the rotating grid plate is 150-250 mm, for example, which can be 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, 210 mm, 220 mm, 230 mm, 240 mm or 250 mm, but is not limited to the listed values, and other unlisted values within the value range are also applicable.

[0022] The utility model further optimizes the structural stability, filtering uniformity and manufacturing and maintenance convenience of the grid plate assembly by limiting the number, layout mode and size parameters of the grid plates, and specifically:

[0023] In a first aspect, the utility model limits the fixed grid plate of both sides of the flow channel, and the number of fixed grid plate is more than the rotating grid plate 1, this symmetrical alternative layout structure improves the structure stability and water flow control accuracy of grid plate assembly, and the both ends of fixed grid plate are used as boundary support points, effectively restrict the overall deformation of grid plate assembly. When the water flow impacts or the rotating grid plate moves, the both sides of fixed grid plate form mechanical anchoring through rigid connection with the side wall, significantly reduce the distortion risk of grid plate assembly caused by uneven stress, especially in high flow rate or large particle impact working condition, can avoid the deflection of rotating grid plate caused by lateral load, ensure the accuracy of gap width adjustment.

[0024] In a second aspect, the number of fixed grid plate is more than the rotating grid plate, so that the rotating grid plate is evenly separated between the adjacent fixed grid plate, and the fixed grid plate is used as a static support structure, and bears the main load transfer function of the grid plate assembly. Each rotating grid plate is clamped by two fixed grid plates, forming a continuous structure of "fixed-rotating-fixed-rotating-fixed". This clamping arrangement keeps the rotating axis of the rotating grid plate within the mechanical protection range of the fixed grid plate, reducing the direct impact of water flow on the rotating shaft, and maintaining the stability of the rotating trajectory through the guiding action of the fixed grid plate, thereby ensuring the synchronization and consistency of all gap widths during dynamic adjustment.

[0025] In a third aspect, the utility model limits the fixed grid plate and the rotating grid plate to be rectangular structures with the same size, and the width is limited to 150-250mm. This parameterized design solves the problems of assembly difficulty and high maintenance cost caused by the size difference of the traditional trash screen. In addition, the width range of 150-250mm has been verified by engineering to achieve the optimal balance between mechanical strength and water efficiency. When the width of the grid plate is less than 150mm, the bending resistance is reduced due to insufficient material thickness, and fatigue deformation may occur under long-term water impact. When the width of the grid plate exceeds 250mm, the number of grid plates per unit length is reduced, and the adjustable range of filtration density is reduced. By selecting this width range, the structural rigidity of the single grid plate during rotation is ensured (especially for high-sand sewage scenes), and sufficient gap density is achieved through a reasonable number of grid plate arrangements (6-10 pieces), so that the device can intercept small suspended solids (such as when the gap is adjusted to 5mm) and quickly discharge large floating objects by expanding the gap to more than 20mm.

[0026] As a preferred technical solution of the utility model, flexible strips are arranged at the vertical long edges of the fixed grid plate and the rotating grid plate to seal the gap between the fixed grid plate and the rotating grid plate.

[0027] In the actual operation of the sewage treatment trash rack, the dynamic sealing between the fixed grid plate and the rotating grid plate is the key element to determine the efficiency of the equipment. The utility model discloses the flexible guide strip is arranged at the vertical long side of fixed grid plate and rotating grid plate, and the dynamic sealing system with self -adaptability is constructed. When the rotating grid plate is adjusted in angle through the transmission shaft, the mechanical clearance between the rigid grid plate can produce millimeter level fluctuation with the change of rotation angle, and the flexible guide strip can fill the physical gap formed due to the position change of the grid plate in real time by virtue of the elastic deformation characteristics. This design effectively solves the leakage problem caused by the insufficient machining precision of the traditional metal sealing element.

[0028] As a preferred technical scheme of the utility model, the rotating assembly comprises a transmission shaft, a driving motor, a plurality of driving gears, a plurality of rotating shafts and a plurality of driven gears.

[0029] In some optional examples, the transmission shaft is located directly above the grid plate assembly, the output shaft of the driving motor is in transmission connection with one end of the transmission shaft, and a plurality of the driving gears are arranged equidistantly along the length direction of the transmission shaft.

[0030] In some optional examples, a rotating shaft is arranged at the vertical axis of each rotating grid plate, and a driven gear is sleeved on the outer periphery of the top end of each rotating shaft, and the driving gear and the driven gear are connected through intermeshing.

[0031] In some optional examples, the driving motor drives the transmission shaft and the plurality of driving gears thereon to rotate simultaneously, drives all the driven gears to rotate through intermeshing, drives the rotating grid plates to rotate synchronously through the rotating shafts, so as to change the gap width between the fixed grid plate and the rotating grid plate.

[0032] The utility model realizes the synchronous angle adjustment of a plurality of rotating grid plates through gear meshing, so as to dynamically control the width of the trash gap. From the structure design, the utility model adopts the mechanical structure of single-shaft driving and multi-stage gear linkage, the transmission shaft is arranged horizontally above the grid plate assembly and is directly connected with the driving motor to form the power input end, and the driving gears equidistantly installed on the transmission shaft are vertically meshed with the driven gears on the top of each rotating grid plate to form the power output end. This design drives the single shaft through the single motor, synchronously transmits the rotating motion to all the rotating grid plates through the meshing relationship of the gear set, guarantees the consistency of the action of the multiple rotating grid plates, and simplifies the complexity of the control system.

[0033] In addition, when the driving motor starts, the transmission shaft drives all the driving gears to rotate synchronously, the vertical meshing of the driving gears and the driven gears converts the horizontal axial rotation into vertical axial rotation, and then drives each rotating grid plate to rotate around its vertical axis through the rotating shaft. Since all the driving gears are equidistantly fixed on the transmission shaft, and each driven gear has the same meshing parameters as the corresponding driving gear, theoretically, the angles of all the rotating grid plates can be completely synchronized. This synchronization directly determines the uniformity of the gap width between the fixed grid plate and the rotating grid plate, and is the key to ensuring the effect of the trash screen. The continuous adjustment of the rotation angle between 0° (the grid plate is completely closed) and 90° (the grid plate is completely expanded) enables the device to flexibly adjust the interception precision according to the particle size distribution of the water pollutants.

[0034] The rotating assembly constructed by the utility model provides a precise and reliable mechanical control basis for dynamic adjustment of the trash screen, and the utility model creatively realizes the centralized driving mode of multiple rotating grid plates linkage by horizontally erecting the transmission shaft above the grid plate assembly and equidistantly arranging multiple driving gears on the surface of the transmission shaft. The rotating shaft at the top end of each rotating grid plate forms orthogonal meshing with the driving gears on the transmission shaft through the driven gears, and such a spatial layout not only ensures the stability of power transmission, but also effectively utilizes the vertical structural space. When the driving motor starts, the rotating motion of the transmission shaft is converted into the synchronous rotation of each rotating shaft through the gear pair, so that all the rotating grid plates operate coordinately as if receiving unified instructions. This design fundamentally solves the problem of asynchronous operation of the traditional multiple grid plate device caused by independent driving, ensures the uniformity of the gap width of the entire row of grid plates, and avoids the phenomenon of pollutant penetration or uneven water flow distribution caused by local opening deviation.

[0035] Compared with the redundant design of using multiple motors to drive a single rotating grid plate, the utility model realizes efficient transmission of "one shaft with multiple plates" through the physical characteristics of gear meshing, significantly reduces the complexity and failure probability of the device. The inherent characteristics of gear transmission enable the system to have self-locking function, and can automatically maintain the current grid plate angle when power supply is stopped, avoiding position deviation caused by water flow impact. In addition, the vertical meshing design of the gear pair, such space layout enables the transmission shaft to be arranged parallel to the water flow direction, which not only avoids the occupation of the water passing section, but also reserves sufficient operation space for subsequent maintenance operation, greatly improving the maintainability of the device.

[0036] The synchronous adjusting ability brought by the rotating assembly makes the trash screen have the intelligent characteristics of dynamically adapting to water quality changes, an operator can accurately adjust the opening and closing angle of the whole row of rotating grating through a single control unit, and real-time response to the change of the suspended particle size distribution in the water body.

[0037] As a preferred technical scheme of the utility model, the first side wall and the second side wall are respectively provided with a first support and a second support at the top, and the two ends of the transmission shaft are movably connected with the first support and the second support.

[0038] In some optional examples, first and second through holes are respectively formed in the first and second supports, the two ends of the transmission shaft pass through the first and second through holes, and transmission bearings are arranged at the connection positions of the two ends of the transmission shaft and the first and second through holes.

[0039] The double-support bearing system designed in the utility model constructs a stable and reliable mechanical support system for the rotating assembly. By arranging the first and second supports with through holes at the top of the two side walls, the rotating movement of the transmission shaft is constrained in an accurate axial track, forming a double-support bearing mode similar to a bridge structure. This structural design can disperse the dynamic load of the transmission shaft to the main structure of the two side walls, effectively avoiding the shaft body deflection deformation problem caused by the traditional single-side cantilever support. When the transmission shaft rotates at high speed under the driving of the driving motor, the transmission bearings at both ends not only bear the uniform distribution of radial load, but also reduce the friction resistance to the lowest through the precise matching of the rolling elements, ensuring the maximization of the power transmission efficiency.

[0040] As a preferred technical scheme of the utility model, the first filter hole is a cylindrical through hole with equal diameters.

[0041] In some optional examples, the second filter hole is a circular truncated cone-shaped through hole with a diameter gradually decreasing along the water flow direction, the opening of the second filter hole close to one side of the first filter plate is the water inlet, the opening of the second filter hole away from one side of the first filter plate is the water outlet, and the diameter of the first filter hole > the diameter of the water inlet > the diameter of the water outlet.

[0042] The second filter hole designed in the utility model has a large water inlet and a small water outlet, and has the following advantages:

[0043] The first aspect is to form a natural "trapping trap" when sewage flows. When the water flow carrying suspended solids enters the larger inlet, the particles enter the inside of the second filter hole according to the fluid inertia, but as the hole diameter gradually decreases along the flow direction, the movement space of the particles is compressed, resulting in collision and accumulation at the narrow outlet. This structural feature enables the second filter plate to achieve "entrance release and outlet interception". Larger particles enter the hole of the second filter hole due to inertia at the inlet, while fine particles are forced to be intercepted due to space limitation at the outlet. Compared with the traditional straight hole structure, this tapered structure design significantly increases the contact probability of pollutants and the hole wall, especially for lightweight suspended solids (such as polypropylene microplastics) with density close to water. At the same time, the shear force generated by the gradually increasing flow rate in the hole of the second filter hole can effectively strip the adhesive pollutants attached to the hole wall, preventing the formation of a stable adhesive layer.

[0044] The second aspect is that the water flow accelerates when passing through the second filter hole due to the decrease in cross-sectional area. The flow rate at the outlet can be 2-3 times that at the inlet. This high-speed flow forms a local turbulent flow at the narrow outlet, which forms a double cleaning mechanism with the mechanical action of the cleaning member. When the first filter plate drives the first cleaning member to insert into the second filter hole, the first cleaning member enters from the large-diameter inlet, and the annular gap formed between the outer diameter of the first cleaning member and the tapered hole wall of the second filter hole gradually decreases, producing a "piston pushing" extrusion effect. As the first cleaning member moves towards the outlet, the continuous contraction of the annular gap pushes the deposited pollutants in the hole towards the outlet, and the high-speed water flow uses fluid power to completely flush the pollutants out of the hole. The synergistic effect of mechanical pushing and water power flushing enables the outlet hole diameter to be smaller than the traditional straight hole while maintaining excellent anti-blocking performance, especially for sewage treatment scenarios containing fiber impurities.

[0045] The third aspect is that the tapered frustum structure of the second filter hole resolves the contradiction between filtration precision and water flow resistance. Traditional small-diameter straight holes have high interception efficiency but result in significant water head loss; while large-diameter straight holes have small resistance but are difficult to intercept fine particles. The present utility model uses the tapered flow channel design to maintain high interception precision at the outlet while reducing the overall flow resistance using the large inlet diameter. The kinetic energy conversion process of the fluid in the hole of the second filter hole is more controllable: the large inlet diameter allows more water flow, reducing the overall pressure drop; the high-speed flow at the outlet achieves efficient interception through local energy concentration.

[0046] In a fourth aspect, the cylindrical hole of the first filter plate and the tapered frustum hole of the second filter plate form a spatially complementary filtering gradient, the first filter hole serving as a primary filter layer to intercept large-scale impurities such as branches and plastic bags with its uniform pore size; the second filter hole serving as a secondary filter layer to capture medium and small particles that the first filter hole fails to intercept through the dynamic contraction of the pore size. This division of labor makes the load distribution of the two-stage filter plate more reasonable, with the first filter plate filtering more than 80% of the large particle interception capacity to protect the second filter plate from impact and wear caused by large-size impurities; the second filter plate focuses on improving the overall filtering precision, and its tapered structure makes the single-hole interception efficiency present an adaptive improvement characteristic with running time, when the outlet is temporarily reduced due to the deposition of fine particles, the subsequent interception capacity of the subsequent pollutants is enhanced, forming a dynamically balanced filtering efficiency. In addition, the structural characteristics of the tapered hole make the second filter plate perform well under the backwashing condition, when the reverse flow is injected from the outlet small hole, the flow velocity decreases due to the gradual expansion of the flow passage cross-sectional area, which can produce a gentle but thorough stripping effect on the deposits in the hole.

[0047] As a preferred technical solution of the utility model, the diameter of the first filter hole is 30-50mm, for example, it can be 30mm, 32mm, 34mm, 36mm, 38mm, 40mm, 42mm, 44mm, 46mm, 48mm or 50mm, but it is not limited to the listed values, and other values not listed in this range are also applicable.

[0048] In some optional examples, the diameter of the water inlet is 15-25mm, for example, it can be 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm or 25mm, but it is not limited to the listed values, and other values not listed in this range are also applicable.

[0049] In some optional examples, the diameter of the water outlet is 8-15mm, for example, it can be 8.0mm, 8.5mm, 9.0mm, 9.5mm, 10.0mm, 10.5mm, 11.0mm, 11.5mm, 12.0mm, 12.5mm, 13.0mm, 13.5mm, 14.0mm, 14.5mm or 15.0mm, but it is not limited to the listed values, and other values not listed in this range are also applicable.

[0050] The utility model particularly limits the diameter of first filter hole is 30~50mm, when the diameter of first filter hole exceeds 50mm, the oversized opening will destroy the barrier function of primary filtration, and the typical large-size pollutants (such as 40~60mm plastic bottle fragments) in water body can directly pass through the first filter plate, and these hard sundries will be mechanically extruded due to the sudden reduction of flow passage cross-sectional area after entering the subsequent second filter hole, not only accelerating the wear of hole wall, but also forming physical jam in the tapered hole of second filter hole, destroying the self-cleaning fluid dynamic field of hole. On the contrary, if the diameter of first filter hole is less than 30mm, although the interception ability of medium-sized sundries is enhanced, the surface flow rate will be abnormally increased, and the fiber pollutants will be more easily wound around the hole edge under the action of high-speed water flow, forming a stable adhesion layer, and this biological membrane type pollution will change the local flow pattern, inducing vortex effect, so that the subsequent fine particles are accelerated to deposit at the hole.

[0051] The utility model particularly limits the diameter of water inlet is 15~25mm, when the diameter of water inlet exceeds 25mm, the medium particle size pollutants (such as 15~30mm rubber particles) will rush into the tapered hole of second filter hole in large quantities, and these elastic substances are easy to form dynamic jam at the narrow outlet due to the deformation recovery characteristics in the flow passage contraction process - the pollutants are temporarily deformed under the impact of high-pressure water flow, but restore the original state and are stuck at the outlet after pressure release, and this intermittent jamming phenomenon will cause system pressure pulsation and aggravate the fatigue damage of mechanical structure. On the contrary, when the diameter of water inlet is less than 15mm, the inlet flow rate of second filter hole will break through the critical value, the micro-sand particles carried by high-speed fluid will produce "water jet effect", continuously cutting the hole wall material, especially when treating the sewage containing quartz sand, the abrasion effect will quickly deteriorate the geometric accuracy of the tapered hole of second filter hole, and the designed flow field is damaged.

[0052] The utility model particularly limits the diameter of water outlet is 8~15mm, when the diameter of water outlet exceeds 15mm, the flow rate gradient at the end of the tapered hole of second filter hole is significantly weakened, and the shear stripping ability of viscous pollutants is lost, and the adhesion of colloidal substances on the hole wall is changed from transient deposition to stable accumulation, and finally a hardened fouling layer that is difficult to remove is formed. On the contrary, when the diameter of water outlet is less than 8mm, although the theoretical interception accuracy can be improved, the Reynolds number at the outlet of second filter hole will break through the critical value of turbulent flow, the high-frequency pressure fluctuation induces cavitation phenomenon, and the shock wave produced by the collapse of micro-bubbles continuously acts on the hole wall of second filter hole, finally leading to structural failure of the hole of second filter hole.

[0053] The size breakthrough of the three-layer aperture system can also produce a cascade effect, the size anomaly of the first filter hole can multiply the subsequent processing load and break the system design pollution balance; the size anomaly of the water inlet can change the migration track of the pollutants in the tapered hole and affect the operation efficiency of the cleaning mechanism; and the size anomaly of the water outlet can directly threaten the structural integrity of the whole filter unit.

[0054] As an optimal technical scheme of the utility model, the driving assembly comprises a first screw rod and a second screw rod, and the axes of the first screw rod and the second screw rod are parallel to the water flow direction.

[0055] In some optional examples, the first filter plate is provided with a first slider and a second slider with internal threads on both sides of the first side wall and the second side wall respectively, and the first slider and the second slider are screwed into the first screw rod and the second screw rod respectively.

[0056] In some optional examples, the end of the first screw rod and / or the second screw rod is provided with a servo motor, the servo motor is used to drive the first screw rod and the second screw rod to rotate synchronously, and the first slider and the second slider move along the first screw rod and the second screw rod respectively under the action of the thread engagement, thereby driving the first filter plate to move towards or away from the second filter plate.

[0057] The utility model designs a driving assembly of double screw rod synchronous driving for the movement of the first filter plate, realizes high-precision control and stable bearing of the movement process of the first filter plate through the innovative integration of spatial layout and mechanical transmission. The utility model arranges the first screw rod and the second screw rod parallel to the water flow direction, makes the action axis of the driving force completely coincide with the movement track of the first filter plate, and this coaxial design eliminates the torque deviation problem caused by the traditional lateral driving. When the servo motor drives the first screw rod and / or the second screw rod to rotate synchronously, the first slider and the second slider screwed into the first screw rod and the second screw rod produce strictly synchronous linear displacement under the action of the thread engagement, and this forced synchronous mechanism ensures that the first filter plate always maintains the vertical posture with the water flow direction in the movement stroke of several meters, avoids the jamming or tilting phenomenon caused by unilateral driving. In addition, the inherent self-locking characteristic of the screw rod transmission makes the first filter plate can be stably parked at any position, which is very important for the working condition that needs to finely adjust the cleaning depth, and solves the positioning drift problem existing in the hydraulic or pneumatic driving system.

[0058] As a preferred technical scheme of the utility model, first base and second base are arranged at the inner walls of the first side wall and the second side wall respectively, both ends of the first screw rod and both ends of the second screw rod are movably fixed on the first base and the second base through screw rod bearings, and the first screw rod and the second screw rod rotate freely on the first base and the second base under the driving of the servo motor.

[0059] The utility model discloses a base-bearing integrated support driving assembly for the normal operation of the driving assembly, and a multidimensional stable mechanical bearing system is constructed for the driving assembly. The first base and the second base are arranged at the inner walls of the first side wall and the second side wall, the rotary motion of the first screw rod and the second screw rod is restricted in the accurate geometric axis, and a precision guide structure similar to a machine tool guide rail is formed. When both ends of the first screw rod and the second screw rod are anchored to the first base and the second base through high-precision screw rod bearings, the rotary freedom thereof is strictly limited to the axial rotation dimension. This constraint mechanism effectively suppresses the radial runout that the first screw rod and the second screw rod may generate during high-speed rotation, and especially when responding to water flow pulsation impact, the rigid connection structure exhibits excellent dynamic stability.

[0060] The working principle of the trash rack with the self-cleaning function for sewage treatment is as follows:

[0061] (1) Equipment starting and filter plate resetting: when starting, the servo motor drives the first screw rod and the second screw rod to rotate, so that the first filter plate moves in the reverse direction along the water flow direction through the first sliding block and the second sliding block, moves away from the second filter plate, and returns to the initial position; at this time, the first cleaning piece on the first filter plate and the second cleaning piece on the second filter plate are completely separated from the first filter hole and the second filter hole, and the flow channel is ensured to be unobstructed.

[0062] (2) Sewage primary filtration and sundry interception: sewage enters from the flow channel inlet, first flows through the cylindrical first filter hole (diameter 30-50 mm) of the first filter plate, and large-volume sundries (such as plastic bottles and branches) are intercepted on the upstream side of the first filter plate; then, the water flow enters the second filter hole of the second filter plate, since the water inlet diameter (15-25 mm) of the second filter hole is smaller than that of the first filter hole, and the water outlet is further reduced to 8-15 mm, the slender sundries (such as water grass and fibers) are entangled into a ball in the tapered channel of the second filter hole due to the increased flow rate, and are intercepted inside the second filter hole.

[0063] (3) Trigger self-cleaning process: when the first filter plate and the second filter plate need to be cleaned, the servo motor is started, the first lead screw and the second lead screw are driven to rotate synchronously, the first filter plate moves to the direction of the second filter plate under the thread meshing action of the lead screw and the sliding block, as the first filter plate approaches the second filter plate, the first cleaning piece on the surface of the first filter plate gradually inserts into the second filter hole of the second filter plate, at the same time, the second cleaning piece on the second filter plate reversely inserts into the first filter hole of the first filter plate, the first cleaning piece and the second cleaning piece push or hook out the sundries trapped in the first filter hole and the second filter hole during the insertion process, and bidirectional cleaning is completed;

[0064] (4) Grating assembly dynamic adjustment and trash blocking: after the sewage passes through the second filter plate, the sewage enters the grating assembly area, the driving motor drives the driving gear to rotate through the transmission shaft, the driving gear is engaged with the driven gear at the top of the rotating grating, so that all the rotating gratings rotate synchronously around the vertical axis, the fixed grating and the rotating grating are alternately arranged, different widths of gaps are formed between the fixed grating and the rotating grating by adjusting the rotation angle (0°~90°) (when the rotating angle is 90°, the gap is the largest and is used for intercepting large floating objects; when the rotating angle is 0°, the gap is the smallest and is used for intercepting small particles), and the flexible baffle provides sealing at the contact edge of the fixed grating and the rotating grating to prevent sundries from leaking from the gap.

[0065] (5) Reset and sundry collection: after self-cleaning is completed, the servo motor is reversed, the first filter plate is driven to retreat to the initial position, the first cleaning piece is separated from the second filter hole, the second cleaning piece is separated from the first filter hole, and the cleaned sundries fall into the flow channel bottom and are collected under the action of water flow or gravity; the grating assembly keeps the set gap or is completely closed to cut off the water flow according to actual requirements, so that the equipment is convenient to maintain.

[0066] Compared with the prior art, the utility model has the advantages that:

[0067] The utility model discloses a multi-stage filtering structure, dynamic adjustment mechanism and the synergistic effect of self-cleaning function, which significantly improves the interception efficiency of suspended solids and impurities in the sewage treatment process, and effectively reduces the equipment blockage and maintenance frequency. The core design is to convert the single filtering mode of the traditional trash rack into a system combining graded filtering and dynamic adjustment, and to realize the self-cleaning function through mechanical linkage, which has high practicability and innovation.

[0068] Firstly, the utility model provides a three -level filter structure is adopted to the trash rack, through the combination design of first filter board, second filter board and grill plate component forms the progressive filtering level. The cylindrical through -hole of first filter board can intercept larger particle pollutants, the circular truncated cone through -hole of second filter board further filters small impurities through taper structure, this gradient filtration design not only improves the interception efficiency, still reduces the risk of single aperture blockage through hole difference. In addition, the opposite surface of first filter board and second filter board is provided with first cleaning piece and second cleaning piece respectively can insert the filter hole (first filter hole and second filter hole) of opposite party, when drive assembly moves first filter board, first cleaning piece and second cleaning piece can go in first filter hole and second filter hole interior and remove attached dirt, realize bidirectional self -cleaning. This mechanical scraping type cleaning mode is more thorough than traditional water force flushing or manual cleaning, especially the cleaning effect of fiber or sticky dirt is remarkable, and the problem of secondary pollution or energy consumption increase caused by high -pressure water flow flushing is avoided.

[0069] Secondly, the innovative design of the grill plate assembly breaks through the limitations of traditional fixed grill plates. By alternately arranging fixed grill plates and rotating grill plates, and configuring a rotating assembly controlled by a gear transmission system, the entire grill plate assembly has a dynamic flow adjustment function. When the sewage flow or the type of pollutants changes, the gap width between the fixed grill plate and the rotating grill plate can be adjusted by rotating the rotating grill plate, which can adapt to the filtering needs under different working conditions and can expand the gap to speed up the discharge of pollutants in cleaning mode. This adjustability improves the adaptability of the equipment to different water quality conditions. In addition, the synchronous rotating action of the rotating grill plate is realized through the precise cooperation of the transmission shaft and the gear set, and the modular structure design ensures the synchronicity and reliability of the action, and facilitates later maintenance and component replacement.

[0070] Thirdly, the optimized design of the drive assembly provides a guarantee for the efficient operation of the entire device. The movement of the first filter plate is realized through a double-screw rod transmission mechanism, and the synchronous rotation under the drive of the servo motor ensures the stability and positioning accuracy of the movement of the first filter plate, so that the cleaning piece can be accurately inserted into the filter hole of the opposite side. At the same time, the self-locking property of the screw rod mechanism can also maintain the stable position of the filter plate in the non-working state, avoiding displacement deviation caused by water flow impact. In addition, the rotating drive of the grill plate assembly adopts an overhead transmission layout, which effectively utilizes the space above the flow channel and avoids the corrosion problem caused by the contact of the transmission components with the sewage, significantly prolonging the service life of the key moving parts.

[0071] The trash rack provided by this utility model achieves functional integration through structural innovation. Its synergistic mechanism of graded filtration and self-cleaning enables the equipment to maintain a high-efficiency filtration state during operation, solving the pain points of traditional trash racks such as easy clogging, difficult maintenance, and poor adaptability. The dynamically adjustable rack assembly gives the equipment flexibility to cope with complex working conditions. For example, during heavy rain, the rack gaps can be temporarily widened to cope with the impact of large flow rates, while the gaps can be narrowed during daily operation to improve interception accuracy. This not only improves sewage treatment efficiency but also significantly reduces energy consumption and the need for manual intervention. It has broad application prospects in municipal sewage treatment, industrial wastewater treatment, and other fields. In particular, for sewage treatment scenarios containing easily entangled impurities such as fibers and hair, its self-cleaning function and anti-clogging design demonstrate unique technical advantages. Attached Figure Description

[0072] Figure 1 A front view of a wastewater treatment trash rack in the closed state, provided in a specific embodiment of this utility model;

[0073] Figure 2 A front view of a wastewater treatment trash rack in the open state, provided as a specific embodiment of this utility model;

[0074] Figure 3 A top view of a wastewater treatment screen in a filtering state, provided as a specific embodiment of the present invention;

[0075] Figure 4 A top view of a wastewater treatment trash rack in a cleaned state, according to a specific embodiment of the present utility model;

[0076] Figure 5 for Figure 1 A magnified view of a portion of region A in the middle;

[0077] Figure 6 for Figure 3 A magnified view of a portion of region B in the middle;

[0078] Wherein: 1-First sidewall; 2-Second sidewall; 3-Flow channel; 4-First filter plate; 5-Second filter plate; 6-Grate assembly; 7-First filter hole; 8-Second filter hole; 9-First cleaning component; 10-Second cleaning component; 11-Drive assembly; 12-Fixed grate plate; 13-Rotating grate plate; 14-Rotating assembly; 15-Drive shaft; 16-Drive motor; 17-Drive gear; 18-Rotating shaft; 19-Driven gear; 20-First bracket; 21-Second bracket; 22-Drive bearing; 23-Inlet; 24-Outlet; 25-First lead screw; 26-Second lead screw; 27-First slider; 28-Second slider; 29-Servo motor; 30-First base; 31-Second base; 32-Lead screw bearing. Detailed Implementation

[0079] The technical scheme of the present application will be described in detail below with specific embodiments and their accompanying drawings. The embodiments described herein are specific embodiments of the present application, which are used to illustrate the concept of the present application; these descriptions are all explanatory and exemplary, and should not be understood as limiting the embodiments of the present application and the protection scope of the present application. In addition to the embodiments described herein, those skilled in the art can also use other technical solutions that are obvious based on the content disclosed in the claims and the description of the present application, which include technical solutions that make any obvious substitutions and modifications to the embodiments described herein.

[0080] The drawings of the present application are schematic drawings that assist in illustrating the concept of the present application, and schematically represent the shape of each part and its mutual relationship. It should be understood that in order to clearly show the structure of each component of the embodiments of the present application, the drawings are not drawn according to the same scale, and the same reference numerals are used to represent the same parts in the drawings. The technical scheme of the present application will be further described below through specific embodiments.

[0081] It should be understood that in the description of the present application, the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0082] It should be noted that in the description of the present application, unless otherwise specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0083] The utility model provides a kind of with self-cleaning function's sewage treatment is used to block trash rack, as shown in Figure 1 、 Figure 2 、 Figure 3 And Figure 4 As shown, the sewage treatment is used to block trash rack with self-cleaning function includes oppositely arranged first side wall 1 and second side wall 2, first side wall 1 and second side wall 2 form flow channel 3 between, first filter plate 4, second filter plate 5 and grill plate assembly 6 are sequentially arranged in flow direction in flow channel 3;

[0084] In Figure 3 And Figure 4 As shown in the embodiment, first filter plate 4 and second filter plate 5 are respectively provided with a plurality of first filter holes 7 and a plurality of second filter holes 8, and the opposite side of first filter plate 4 and second filter plate 5 is respectively provided with first cleaning part 9 and second cleaning part 10, and first cleaning part 9 and second cleaning part 10 are respectively aligned with second filter hole 8 and first filter hole 7;

[0085] In Figure 3 And Figure 4 As shown in the embodiment, first filter plate 4 is circumscribed by driving assembly 11, and driving assembly 11 is used to drive first filter plate 4 to move to the direction close to second filter plate 5, so that first cleaning part 9 and second cleaning part 10 are respectively inserted into second filter hole 8 and first filter hole 7.

[0086] The utility model is through the synergies of multistage filtration structure, dynamic adjustment mechanism and self-cleaning function, significantly improve the interception efficiency of suspended solids and impurities in sewage treatment process, effectively reduce equipment jam and maintenance frequency simultaneously.The core design is that the single filtration mode of traditional block trash rack is converted into the system combined with grading filtration and dynamic adjustment, and self-cleaning function is realized through mechanical linkage, with higher practicality and innovativeness.

[0087] Firstly, the utility model provides a three -level filter structure is adopted to the trash rack, through the combination design of first filter plate 4, second filter plate 5 and grill plate assembly 6 forms the progressive filtering level. The cylindrical through -hole of first filter plate 4 can intercept larger particle pollutants, and the circular truncated cone through -hole of second filter plate 5 is further filtered small impurities through taper structure, this gradient filtration design not only improves the interception efficiency, still reduces the risk of single aperture blockage through hole difference. In addition, the opposite surface of first filter plate 4 and second filter plate 5 is provided with first cleaning piece 9 and second cleaning piece 10 respectively can insert the filter hole (first filter hole 7 and second filter hole 8) of opposite party, when drive assembly 11 moves first filter plate 4, first cleaning piece 9 and second cleaning piece 10 can go in first filter hole 7 and second filter hole 8 inside and remove attached dirt, realize bidirectional self -cleaning. This mechanical scraping type cleaning mode is more thorough than traditional hydraulic flushing or manual cleaning, especially for the cleaning effect of fiber or sticky dirt is remarkable, at the same time avoids the secondary pollution or energy consumption increase problem caused by high -pressure water flow flushing.

[0088] Secondly, the innovative design of grill plate assembly 6 breaks through the limitation of traditional fixed grill plate. By alternately arranging fixed grill plate 12 and rotating grill plate 13, and configuring rotating assembly 14 controlled by gear transmission system, the whole grill plate assembly 6 has the function of dynamic flow adjustment. When the sewage flow or the type of pollutants changes, the gap width between fixed grill plate 12 and rotating grill plate 13 can be adjusted by rotating grill plate 13, which can adapt to the filtering needs under different working conditions and can also expand the gap to speed up the discharge of dirt in cleaning mode. This adjustability improves the adaptability of the equipment to different water quality conditions. In addition, the synchronous rotating action of rotating grill plate 13 is realized through the precise cooperation of transmission shaft 15 and gear set, and the modular structure design not only ensures the synchronism and reliability of the action, but also facilitates later maintenance and component replacement.

[0089] Thirdly, the optimized design of drive assembly 11 provides protection for the efficient operation of the whole device. The movement of first filter plate 4 is realized through a double-screw rod transmission mechanism, and the synchronous rotation under the drive of servo motor 29 ensures the stability and positioning accuracy of the movement of first filter plate 4, so that the cleaning piece can be accurately inserted into the filter hole of the other side. At the same time, the self-locking property of the screw rod mechanism can also maintain the stable position of the filter plate in the non-working state, avoiding displacement deviation caused by water flow impact. In addition, the rotating drive of grill plate assembly 6 adopts an overhead transmission layout, which effectively utilizes the space above flow channel 3 and avoids the corrosion problem caused by the contact of transmission components with sewage, significantly prolonging the service life of the key moving parts.

[0090] The utility model discloses a provide the trash rack through structural innovation realized the function integration, and its grading filter and the synergic mechanism of self -cleaning make the equipment can continuously keep efficient filtration state in the operation process, solved the traditional trash rack easy to block, maintenance difficult, poor adaptability etc. The pain point problem of the flexible of equipment coping with complex working condition is endowed to the dynamic adjustable grid plate assembly 6, for example, can temporarily expand the grid plate gap to cope with the large flow impact in the rainstorm period, and the gap is reduced to improve the interception accuracy in the daily operation, not only improve the sewage treatment efficiency, but also significantly reduce the energy consumption and manual intervention demand, has wide application prospect in the municipal sewage treatment, industrial wastewater treatment etc. Field, especially for the sewage scene of processing the fiber, hair etc. Easy to entangle impurity, its self -cleaning function and anti -blocking design show the unique technical advantage.

[0091] In Figure 2 And Figure 3 The embodiment shown, the grid plate assembly 6 is perpendicular to the water flow direction in the flow channel 3, the grid plate assembly 6 is made of several grid plates, including several fixed grid plates 12 and several rotating grid plates 13 in the same plane, the fixed grid plate 12 and the rotating grid plate 13 are alternately arranged along the horizontal direction.

[0092] In Figure 1 And Figure 2 The embodiment shown, the rotating grid plate 13 is transmission connection with rotating assembly 14, the rotating assembly 14 is used for driving the rotating grid plate 13 to rotate along its vertical axis, so that the gap (such as Figure 2 The embodiment shown).

[0093] The utility model integrates the fixed grid plate 12 and the rotating grid plate 13 in the same plane in horizontal alternate mode, and introduces rotating assembly 14, constructs a dynamic adjustable grid plate assembly 6, can significantly improve the filtration efficiency, enhance the anti -blocking ability, optimize the equipment adaptability, specifically:

[0094] First, the utility model provides the grid plate assembly 6 of the utility model breaks through the rigid limit of the fixed grid plate of traditional trash rack, and the fixed grid plate 12 and the rotating grid plate 13 are alternately arranged along the horizontal direction, so that the gap width between adjacent grid plates can be dynamically adjusted by the rotation of the rotating grid plate 13 around the vertical axis. This design cleverly realizes the active control of the grid plate gap. Under normal filtration conditions, the rotating grid plate 13 can be adjusted to closely fit the fixed grid plate 12, forming a uniform narrow gap to intercept small suspended solids. When a large amount of easily clogged material (such as branches, plastic bags, etc.) appears in the sewage or needs to cope with sudden large flow impact, the gap can be enlarged by the rotating grid plate 13 to quickly release the accumulated material, avoiding the rapid increase of water flow resistance caused by local blockage or even equipment overload. This dynamic adjustment capability enables the equipment to optimize the filtration accuracy and water efficiency in real time according to the actual water quality and flow changes, significantly improving the working condition adaptability of the trash rack.

[0095] In the second aspect, the periodic rotating action of the rotating grate 13 itself constitutes a mechanical cleaning method in terms of anti-clogging and self-cleaning functions. When the rotating grate 13 rotates around the vertical shaft, the relative movement between the edge of the rotating grate 13 and the fixed grate 12 can continuously scrape the viscous dirt (such as oil and algae) attached to the surface of the grate, effectively destroying the adhesion state of the dirt. At the same time, the dynamic change of the gap width during rotation can disturb the dirt trapped in the gap between the fixed grate 12 and the rotating grate 13, so that the dirt is more easily removed under the action of gravity or water flow. Compared with the passive cleaning method of traditional trash screens relying on manual rake cleaning or high-pressure water washing, this self-cleaning mechanism integrated into the operation process of the equipment greatly reduces the maintenance frequency and the need for manual intervention. Especially when dealing with hair, fibers and other easily entangled substances, the rotating action of the rotating grate 13 can actively cut off the entangled material to prevent the formation of dirt clumps that are difficult to remove.

[0096] In the third aspect, the rotating shaft 18 is vertically arranged and rotates around its vertical axis, and the rotating plane of the rotating grate 13 is perpendicular to the direction of the water flow. This not only avoids the problem of secondary accumulation of dirt caused by horizontal rotation, but also makes full use of the space of the flow channel 3, so that the overall structure of the equipment is more compact. The design of the fixed grate 12 and the rotating grate 13 arranged in the same plane ensures the stability of the flow state when the water flows through the grate assembly 6, reduces the generation of turbulence, and thus reduces the risk of re-suspension of dirt caused by water flow disturbance. In addition, the fixed grate 12 in the utility model bears the main structural support function, and the rotating grate 13 focuses on dynamic adjustment. This functional separation design improves the modularity of the grate assembly 6. When an individual rotating grate 13 needs to be repaired due to mechanical failure, it can be replaced separately without affecting the operation of the overall grate assembly 6, significantly shortening the equipment maintenance downtime, which is particularly important for sewage treatment systems that need to be continuously operated.

[0097] In the fourth aspect, the utility model realizes the balance and optimization of filtering efficiency and energy consumption through the structural innovation of the fixed grate 12 and the rotating grate 13. The traditional fixed grate 12 will cause the contraction of the water passage section when dirt accumulates, resulting in an increase in the energy consumption of the pump station with the increase in the degree of clogging. In the utility model, the dynamic adjustment function of the rotating grate 13 can actively maintain the optimal water passage section, and cooperate with the self-cleaning function to reduce the retention of dirt, so as to maintain a low water flow resistance in the long-term operation. In addition, the driving torque required for vertical shaft rotation is small, and in combination with a precise transmission mechanism, reliable gap adjustment can be achieved under low power consumption conditions, meeting the urgent needs of the sewage treatment industry for energy-saving equipment.

[0098] In Figure 1 , Figure 2 , Figure 3 and Figure 4In the shown embodiment, the two grid plates close to the first side wall 1 and the second side wall 2 in the grid plate assembly 6 are both fixed grid plates 12, the number of the fixed grid plates 12 = the number of the rotating grid plates 13 + 1, and optionally, the number of the fixed grid plates 12 is 6-10. Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown in the specific embodiment, the number of the fixed grid plates 12 is 6, and the number of the rotating grid plates 13 is 5.

[0099] The fixed grid plates 12 and the rotating grid plates 13 are both rectangular and have the same size, and the width of the fixed grid plates 12 and the rotating grid plates 13 is 150-250 mm.

[0100] The utility model discloses through limiting the grid plate number, layout mode and size parameter, further optimize the structure stability, filtering uniformity and manufacturing maintenance convenience of grid plate assembly 6, and specifically speaking:

[0101] In the first aspect, the utility model limits the grid plate close to the two side walls of the flow channel 3 to be the fixed grid plate 12, and the number of the fixed grid plate 12 is more than the rotating grid plate 13 by 1, this symmetrical and alternative layout structure improves the structure stability and water flow control precision of the grid plate assembly 6, and the fixed grid plate 12 at both ends acts as a boundary support point, effectively restricts the overall deformation of the grid plate assembly 6. When the water flow impacts or the rotating grid plate 13 moves, the two side fixed grid plates 12 form mechanical anchoring with the side walls through rigid connection, significantly reduce the risk of distortion of the grid plate assembly 6 caused by uneven stress, especially in high flow rate or large particle impact working conditions, the deflection of the rotating grid plate 13 caused by lateral load can be avoided, and the accuracy of the gap width adjustment is ensured.

[0102] In the second aspect, the number of the fixed grid plate 12 is more than the rotating grid plate 13, so that the rotating grid plate 13 is evenly separated between the adjacent fixed grid plates 12, the fixed grid plate 12 acts as a static support structure and bears the main load transfer function of the grid plate assembly 6, and each rotating grid plate 13 is clamped by two fixed grid plates 12 to form a continuous structure of "fixed-rotating-fixed-rotating-fixed", this clamping arrangement makes the rotating axis of the rotating grid plate 13 always within the mechanical protection range of the fixed grid plate 12, which not only reduces the direct impact of the water flow on the rotating shaft 18, but also maintains the trajectory stability of the rotating action through the guiding action of the fixed grid plate 12, thereby guaranteeing the synchronization and consistency of all gap widths in the dynamic adjustment process.

[0103] In a third aspect, the utility model limits fixed grid plate 12 and rotating grid plate 13 are the same size rectangular structure, width is limited at 150~250mm, this parameter design solves the problem of difficult assembly and high maintenance cost caused by the size difference of traditional trash rack components; in addition, the width range of 150~250mm is verified by engineering, which can achieve the optimal balance between mechanical strength and water efficiency. When the width of the grid plate is less than 150mm, the bending resistance is reduced due to insufficient material thickness, and fatigue deformation may occur under long-term water impact; when the width of the grid plate exceeds 250mm, the number of grid plates in unit length is reduced, and the adjustable range of filtering density is reduced. The width interval is selected in the scheme, which not only ensures the structural rigidity of the single grid plate during rotation (especially for high sand content sewage scenes), but also realizes sufficient gap density through reasonable number of grid plate arrangement (6~10 pieces), so that the equipment can intercept small suspended solids (such as when the gap is adjusted to 5mm), and can also quickly discharge large floating objects by expanding the gap to more than 20mm.

[0104] In a specific embodiment, flexible strips (not shown in the figure) are provided at the vertical long edges of the fixed grid plate 12 and the rotating grid plate 13 to seal the gap between the fixed grid plate 12 and the rotating grid plate 13.

[0105] In the actual operation of the sewage treatment trash rack, the dynamic sealing between the fixed grid plate 12 and the rotating grid plate 13 is a key element to determine the efficiency of the equipment. The utility model sets flexible strips at the vertical long edges of the fixed grid plate 12 and the rotating grid plate 13, and constructs a dynamic sealing system with self-adaptive ability. When the rotating grid plate 13 is adjusted in angle by the transmission shaft 15, the mechanical gap between the rigid grid plates will fluctuate by millimeter level with the change of rotation angle, and the flexible strips can fill the physical gap formed by the change of grid plate position in real time due to their elastic deformation characteristics. This design effectively solves the leakage problem caused by insufficient machining precision of traditional metal sealing elements.

[0106] In the embodiments shown in Figure 1 and Figure 2 , the rotating assembly 14 includes a transmission shaft 15, a drive motor 16, a plurality of driving gears 17, a plurality of rotating shafts 18 and a plurality of driven gears 19.

[0107] The transmission shaft 15 is located directly above the grid plate assembly 6, the output shaft of the drive motor 16 is in transmission connection with one end of the transmission shaft 15, and a plurality of driving gears 17 are arranged equidistantly along the length direction of the transmission shaft 15.

[0108] A rotating shaft 18 is arranged at the vertical axis of each rotating grid plate 13, and a driven gear 19 is sleeved on the outer periphery of the top end of each rotating shaft 18, and the driving gear 17 and the driven gear 19 are connected through intermeshing.

[0109] The driving motor 16 drives the transmission shaft 15 and the plurality of driving gears 17 on the transmission shaft 15 to rotate simultaneously, drives all driven gears 19 to rotate through the meshing between the gears, and drives the rotating grating plate 13 to rotate synchronously through the rotating shaft 18, so as to change the gap width between the fixed grating plate 12 and the rotating grating plate 13 (as shown in the figure). Figure 2

[0110] The utility model discloses a plurality of rotating grating plates 13 are realized synchronous angle adjustment through gear meshing, thereby dynamically control the width of the trash holding gap. From the structure design, the utility model discloses single-shaft drive, multistage gear linkage mechanical framework, and the transmission shaft 15 is horizontally arranged along the grating plate assembly 6 directly above, is directly connected with the driving motor 16, forms the power input end, and the driving gear 17 equidistantly installed on the transmission shaft 15 is perpendicular with the driven gear 19 on the top of each rotating grating plate 13 Meshing, constitutes the power output end. This design drives single-shaft through single motor, utilizes the meshing relationship of gear set to transmit the rotation to all rotating grating plates 13 synchronously, guarantees the consistency of the action of multiple rotating grating plates 13, and simplifies the complexity of control system.

[0111] In addition, when the driving motor 16 starts, the transmission shaft 15 drives all driving gears 17 to rotate synchronously, the vertical meshing of the driving gear 17 and the driven gear 19 converts the horizontal rotation into the vertical rotation, and then drives each rotating grating plate 13 to rotate around the vertical axis of the rotating grating plate 13 through the rotating shaft 18. Since all driving gears 17 are equidistantly fixed on the transmission shaft 15, and the meshing parameters of each driven gear 19 and the corresponding driving gear 17 are the same, theoretically, the angles of all rotating grating plates 13 can be completely synchronized. This synchronization directly determines the uniformity of the gap width between the fixed grating plate 12 and the rotating grating plate 13, which is the key to ensuring the trash holding effect. The continuous adjustment of the rotation angle between 0° (the grating plate is completely closed) and 90° (the grating plate is completely expanded) enables the device to flexibly adjust the interception precision according to the particle size distribution of the water pollutants.

[0112] ​The utility model discloses a rotating assembly 14 constructs for the dynamic adjustment of the trash rack provides accurate and reliable mechanical control basis, the utility model discloses a transmission shaft 15 is horizontally arranged in the direct overhead of the grid plate assembly 6, and a plurality of driving gears 17 are equidistantly arranged on its surface, and the centralized drive mode of the linkage of multiple rotating grid plates 13 is realized creatively. The rotation shaft 18 of each rotating grid plate 13 top end is formed with the driving gear 17 on the transmission shaft 15 through the driven gear 19 and forms the orthogonal meshing, and this spatial layout guarantees the stability of power transmission, and effectively utilizes the structure space in the vertical direction. When the driving motor 16 starts, the rotating movement of the transmission shaft 15 is converted into the synchronous rotation of each rotation shaft 18 through the gear pair, so that all rotating grid plates 13 operate in coordination like receiving unified instruction. This design fundamentally solves the problem of different motion of traditional multiple grid plate equipment caused by independent driving, ensures the uniformity of the gap width of the whole row of grid plates, avoids the phenomenon of dirt penetration or uneven water distribution caused by local opening deviation.

[0113] Compared with the redundant design of using multiple motors to drive a single rotating grid plate 13 to rotate, the utility model realizes the efficient transmission of "one shaft with multiple plates" through the physical characteristics of gear meshing, significantly reduces the complexity and failure probability of the equipment. The inherent characteristics of gear transmission make the system have self-locking function, and can automatically maintain the current grid plate angle when stopping power supply, avoiding the position deviation caused by water flow impact. In addition, the vertical meshing design of the gear pair, this spatial layout makes the transmission shaft 15 be arranged parallel to the water flow direction, which avoids the occupation of the water cross section and reserves sufficient operation space for subsequent maintenance operation, greatly improves the maintainability of the equipment.

[0114] The synchronous adjustment capability brought by the rotating assembly 14 designed by the utility model makes the trash rack have the intelligent characteristics of dynamically adapting to water quality changes, and the operating personnel can accurately adjust the opening and closing angle of the whole row of rotating grid plates 13 through a single control unit, and respond to the change of the particle size distribution of suspended solids in the water body in real time. When encountering sudden large-volume debris impact, the gap width can be quickly increased to avoid accumulation in front of the grid; and when treating sewage containing fine particles, the gap can be quickly reduced to improve the interception accuracy. This flexible regulation and control capability makes the equipment break through the limitation of the fixed grid spacing of the traditional trash rack and shows unique advantages in the scenes of municipal pipe network and industrial wastewater treatment with large flow fluctuation.

[0115] In the embodiment shown in Figure 1 and Figure 2 , the top of the first side wall 1 and the second side wall 2 is respectively provided with a first support 20 and a second support 21, and the two ends of the transmission shaft 15 are respectively movably connected with the first support 20 and the second support 21.

[0116] In the embodiment shown in Figure 5In the shown embodiment, the first support 20 and the second support 21 are respectively provided with a first through hole and a second through hole (not shown in the figure), the two ends of the transmission shaft 15 respectively pass through the first through hole and the second through hole, and the two ends of the transmission shaft 15 are respectively provided with a transmission bearing 22 at the connection position of the first through hole and the second through hole, and under the driving of the driving motor 16, the two ends of the transmission shaft 15 are freely rotated in the first through hole and the second through hole.

[0117] The double-support bearing system designed in the utility model constructs a stable and reliable mechanical support system for the rotating assembly 14. By arranging the first support 20 and the second support 21 with through holes on the top of the two side walls, the rotating movement of the transmission shaft 15 is constrained in the accurate axial track, and a double-support bearing mode similar to the bridge structure is formed. The structural design can disperse the dynamic load of the transmission shaft 15 to the main structure of the two side walls, and effectively avoids the shaft body deflection deformation problem caused by the traditional single-side cantilever support. When the transmission shaft 15 is rotated at high speed under the driving of the driving motor 16, the transmission bearings 22 at the two ends not only bear the uniform distribution of the radial load, but also reduce the friction resistance to the minimum through the precise matching rolling elements, so that the maximum of the power transmission efficiency is ensured.

[0118] In Figure 3 and Figure 4 In the shown embodiment, the first filter hole 7 is a cylindrical through hole with equal diameters, the second filter hole 8 is a circular truncated cone through hole with a diameter gradually reducing along the water flow direction, the opening of the second filter hole 8 close to the first filter plate 4 is the water inlet 23, the opening of the second filter hole 8 away from the first filter plate 4 is the water outlet 24, and the diameter of the first filter hole 7 is greater than that of the water inlet 23 and the water outlet 24.

[0119] The second filter hole 8 designed in the utility model is a circular truncated cone hole structure with a large water inlet 23 and a small water outlet 24, and the advantage thereof lies in that:

[0120] Firstly, a natural "trapping trap" is formed when the sewage flows, when the water flow carrying suspended solids enters the larger water inlet 23, the particulate matter enters the inside of the hole channel of the second filter hole 8 according to the fluid inertia, but as the hole diameter gradually reduces along the flow direction, the movement space of the particulate matter is compressed, resulting in collision and accumulation of the particulate matter at the narrow outlet 24. This structural characteristic enables the second filter plate 5 to realize the intelligent trapping of "entrance release and outlet interception", and the larger particles enter the hole channel of the second filter hole 8 due to inertia at the water inlet 23, while the fine particles are forced to be trapped due to space limitation at the water outlet 24. Compared with the traditional straight hole structure, this tapered structure design significantly increases the contact probability of pollutants and the hole wall, and especially exhibits stronger capturing capacity for light suspended solids (such as polypropylene microplastics) with density close to water. At the same time, the shear force generated by the gradually increasing flow rate in the hole channel of the second filter hole 8 can effectively strip the viscous pollutants adhered to the hole wall, preventing the formation of a stable adhesion layer.

[0121] Secondly, the water flow is accelerated when passing through the second filter hole 8 due to the decrease of the cross-sectional area, and the flow rate at the water outlet 24 can be 2-3 times that at the water inlet 23. The high-speed flow forms a local turbulent flow at the narrow water outlet 24, and the mechanical action of the cleaning member forms a double cleaning mechanism: when the first filter plate 4 drives the first cleaning member 9 to insert into the second filter hole 8, the first cleaning member 9 enters from the large-diameter water inlet 23, and the outer diameter of the first cleaning member 9 gradually reduces the annular gap formed by the tapered hole wall of the second filter hole 8, generating a squeezing effect similar to "piston pushing". As the first cleaning member 9 moves towards the water outlet 24, the continuous contraction of the annular gap pushes the deposited dirt in the hole towards the water outlet 24, and the high-speed water flow completely flushes these dirt out of the hole with the help of fluid power. The synergistic effect of mechanical pushing and water power flushing enables the water outlet 24 to maintain excellent anti-clogging performance even if the diameter of the water outlet 24 is smaller than that of the traditional straight hole, especially in the sewage treatment scene containing fiber impurities.

[0122] Thirdly, the tapered frustum hole structure of the second filter hole 8 resolves the contradiction between filtering precision and water flow resistance. Although the traditional small-diameter straight hole has high interception efficiency, it will cause significant water head loss; while the large-diameter straight hole has small resistance, but it is difficult to intercept fine particles. The present application designs a tapered flow channel 3 to maintain high interception precision at the water outlet 24 while reducing the overall flow resistance by using the large-diameter water inlet 23. The kinetic energy conversion process of the fluid in the hole of the second filter hole 8 is more controllable: the large-diameter water inlet 23 allows more water flow to pass through, reducing the overall pressure drop; the high-speed flow at the water outlet 24 achieves efficient interception through local energy concentration.

[0123] Fourthly, the cylindrical hole of the first filter plate 4 and the tapered frustum hole of the second filter plate 5 form a spatially complementary filtering gradient. The first filter hole 7 serves as a primary filter layer to intercept large-scale debris such as branches and plastic bags with its uniform diameter; the second filter hole 8 serves as a secondary filter layer to capture medium and small particles that the first filter hole 7 fails to intercept through dynamic contraction of the hole diameter. This division of labor makes the load distribution of the two-stage filter plate more reasonable, with the first filter plate 4 filtering more than 80% of the large particle interception capacity, protecting the second filter plate 5 from impact and abrasion by large-size impurities; the second filter plate 5 focuses on improving the overall filtering precision, and its tapered structure makes the single-hole interception efficiency exhibit self-adaptive improvement characteristics over time. When the water outlet 24 is temporarily reduced due to the deposition of fine particles, the subsequent interception capacity of the contaminants is enhanced, forming a dynamically balanced filtering efficiency. In addition, the structural characteristics of the tapered hole make the second filter plate 5 perform well in the backwashing condition. When the reverse flow is injected from the small hole of the water outlet 24, the flow rate decreases due to the gradual expansion of the flow channel 3 cross-sectional area, which can produce a gentle but thorough stripping effect on the deposits in the hole.

[0124] InFigure 3 and Figure 4 In the embodiment shown, the diameter of the first filter hole 7 is 30-50 mm, the diameter of the water inlet 23 is 15-25 mm, and the diameter of the water outlet 24 is 8-15 mm.

[0125] The utility model particularly limits the diameter of the first filter hole 7 is 30-50 mm, when the diameter of the first filter hole 7 exceeds 50 mm, oversized opening will destroy the barrier function of primary filtration, and typical large-size pollutants (such as 40-60 mm plastic bottle fragments) in water body can directly pass through the first filter plate 4, after these hard sundries enter the subsequent second filter hole 8, because the cross section of the flow channel 3 suddenly reduces, mechanical extrusion effect is generated, not only accelerate the hole wall wear, more can form physical jam in the tapered hole channel of the second filter hole 8, destroy the self-cleaning fluid dynamic field of hole channel. Conversely, if the diameter of the first filter hole 7 is less than 30 mm, although the interception ability to medium sundries is enhanced, but can lead to the abnormal rise of surface flow rate, and fiber type pollutants are more easily wound around the edge of the hole in the action of high-speed water flow, form stable adhesion layer, and this biological membrane type pollution can change local flow state, induce vortex effect, make subsequent small particles accelerate deposition at the hole.

[0126] The utility model particularly limits the diameter of the water inlet 23 is 15-25 mm, when the diameter of the water inlet 23 exceeds 25 mm, medium particle size pollutants (such as 15-30 mm rubber particles) can rush into the tapered hole channel of the second filter hole 8 in large quantities, and these elastic substances are easy to form dynamic blockage at the narrow place of the water outlet 24 in the contraction process of the flow channel 3 due to the deformation recovery characteristics, - temporarily deformed through under the impact of high-pressure water flow, but restore the original state and jam in the outlet after pressure release, and this intermittent blockage phenomenon can cause system pressure pulsation, aggravate the fatigue damage of mechanical structure. Conversely, when the diameter of the water inlet 23 is less than 15 mm, can lead to the inlet flow rate of the second filter hole 8 to break through the critical value, and the micro-sand particles carried by high-speed fluid produce "water jet effect", continuously cut the hole wall material, especially when processing the sewage containing quartz sand, and the abrasion effect can make the geometric precision of the tapered hole channel of the second filter hole 8 rapidly deteriorate, and destroy the design flow field.

[0127] The utility model specially limits that the diameter of water outlet 24 is 8~15mm, when the diameter of water outlet 24 exceeds 15mm, the flow velocity gradient of the tapered hole end of second filter hole 8 is weakened significantly, loses the shear stripping ability to viscous contaminant, the adhesion of colloidal substance on the hole wall changes from transient deposition to steady accumulation, and finally forms the hardened scale layer that is difficult to remove. Conversely, when the diameter of water outlet 24 is less than 8mm, although the theoretical interception precision can be improved, but the Reynolds number at the outlet of second filter hole 8 breaks through the critical value of turbulent flow, and the cavitation phenomenon is induced by high-frequency pressure fluctuation, and the shock wave produced by the collapse of micro-bubbles continuously acts on the hole wall of second filter hole 8, finally leading to structural failure of the hole of second filter hole 8.

[0128] The size of the three-layer aperture system designed in the utility model will also produce a cascade effect, and the abnormal size of the first filter hole 7 will double the subsequent treatment load and break the system design pollution balance; the abnormal size of the water inlet 23 will change the migration trajectory of the pollutants in the tapered hole and affect the operation efficiency of the cleaning mechanism; and the abnormal size of the water outlet 24 will directly threaten the structural integrity of the entire filter unit.

[0129] In Figure 3 and Figure 4 In the embodiment shown, the drive assembly 11 includes a first lead screw 25 and a second lead screw 26, and the axes of the first lead screw 25 and the second lead screw 26 are parallel to the water flow direction.

[0130] The first filter plate 4 is provided with a first slider 27 and a second slider 28 with internal threads on the two side edges close to the first side wall 1 and the second side wall 2, respectively, and the first slider 27 and the second slider 28 are screwed into the first lead screw 25 and the second lead screw 26, respectively.

[0131] The end of the first lead screw 25 and / or the second lead screw 26 is provided with a servo motor 29, which is used to drive the first lead screw 25 and the second lead screw 26 to rotate synchronously, and the first slider 27 and the second slider 28 move along the first lead screw 25 and the second lead screw 26 under the action of thread engagement, thereby driving the first filter plate 4 to move towards or away from the second filter plate 5.

[0132] The utility model discloses a double screw rod synchronous drive's drive component 11 is designed for the movement of first filter plate 4, realizes the high accuracy control and stable bearing of first filter plate 4 movement process through the innovative integration of space layout and mechanical drive. The utility model arranges first screw rod 25 and second screw rod 26 parallel to water flow direction, makes the driving force action axis and first filter plate 4 motion track completely coincide, and this coaxial design eliminates the torque deviation problem produced by traditional lateral drive. When servo motor 29 drives first screw rod 25 and / or second screw rod 26 synchronous rotation, first slider 27 and second slider 28 that are screwed into first screw rod 25 and second screw rod 26 produce strict synchronous linear displacement under the action of thread engagement, and this forced synchronization mechanism ensures that first filter plate 4 always maintains the vertical posture with water flow direction in the movement stroke of up to several meters, avoids the jam or inclination phenomenon caused by one-sided drive. In addition, the inherent self-locking characteristic of screw rod drive makes first filter plate 4 can be stably parked at any position, which is crucial for the working condition that needs fine adjustment cleaning depth, and solves the positioning drift problem existing in hydraulic or pneumatic drive system.

[0133] In Figure 6 In the embodiment shown, first base 30 and second base 31 are respectively arranged at the inner walls of first side wall 1 and second side wall 2, and both ends of first screw rod 25 and both ends of second screw rod 26 are movably fixed on first base 30 and second base 31 through screw rod bearings 32. First screw rod 25 and second screw rod 26 are driven by servo motor 29 to rotate freely on first base 30 and second base 31, respectively.

[0134] The utility model constructs a multi-dimensional stable mechanical bearing system for drive component 11 by supporting the normal operation of base-bearing integrated drive component 11. By arranging first base 30 and second base 31 at the inner walls of first side wall 1 and second side wall 2, the rotary motion of first screw rod 25 and second screw rod 26 is constrained within an accurate geometric axis, forming a precision guide structure similar to a machine tool guide. When both ends of first screw rod 25 and second screw rod 26 are anchored to first base 30 and second base 31 through high-precision screw rod bearings 32, their rotational degrees of freedom are strictly limited to axial rotation dimension. This constraint mechanism effectively suppresses the radial runout that first screw rod 25 and second screw rod 26 may produce when rotating at high speed, especially when responding to water flow pulsation impact. This rigid connection structure exhibits excellent dynamic stability.

[0135] In the second aspect, the working principle of the trash rack with self-cleaning function for sewage treatment is as follows:

[0136] (1) Device startup and filter plate reset: when starting, the servo motor 29 drives the first lead screw 25 and the second lead screw 26 to rotate, so that the first filter plate 4 moves away from the second filter plate 5 by moving in the opposite direction of the water flow through the first sliding block 27 and the second sliding block 28, and returns to the initial position; at this time, the first cleaning part 9 on the first filter plate 4 is completely separated from the first filter hole 7 and the second filter hole 8 of the second cleaning part 10 on the second filter plate 5, ensuring that the flow channel 3 is unobstructed (as shown in Figure 1 and Figure 3 );

[0137] (2) Sewage primary filtration and debris interception: sewage enters from the inlet of the flow channel 3, first flows through the cylindrical first filter hole 7 (diameter 30-50 mm) of the first filter plate 4, and large-volume debris (such as plastic bottles and branches) is intercepted on the upstream side of the first filter plate 4; then, the water flow enters the second filter hole 8 of the second filter plate 5, as the inlet 23 of the second filter hole 8 is smaller in diameter (15-25 mm) than the first filter hole 7, and the outlet 24 is further reduced to 8-15 mm, elongated debris (such as water grass and fibers) is entangled into a ball in the tapered channel of the second filter hole 8 due to the increase in flow rate, and is intercepted inside the second filter hole 8;

[0138] (3) Triggering the self-cleaning process: when the first filter plate 4 and the second filter plate 5 need to be cleaned, the servo motor 29 is started to drive the first lead screw 25 and the second lead screw 26 to rotate synchronously, the first filter plate 4 moves towards the second filter plate 5 under the thread engagement of the lead screw and the sliding block, and as the first filter plate 4 approaches the second filter plate 5, the first cleaning part 9 on its surface gradually inserts into the second filter hole 8 of the second filter plate 5, at the same time, the second cleaning part 10 on the second filter plate 5 reversely inserts into the first filter hole 7 of the first filter plate 4, the first cleaning part 9 and the second cleaning part 10 push or hook out the debris intercepted in the first filter hole 7 and the second filter hole 8 during the insertion process, completing the bidirectional cleaning (as shown in Figure 4 );

[0139] (4) Dynamic adjustment and debris interception of the grid assembly 6: after the sewage passes through the second filter plate 5, it enters the area of the grid assembly 6, the driving motor 16 drives the driving gear 17 to rotate through the transmission shaft 15, the driving gear 17 engages with the driven gear 19 on the top of the rotating grid 13, causing all rotating grids 13 to rotate synchronously around the vertical axis, the fixed grid 12 and the rotating grid 13 are arranged alternately, by adjusting the rotation angle (0°-90°), different widths of gaps are formed between them (the gap is largest when the rotation angle is 90°, used for intercepting large floating objects; the gap is smallest when the rotation angle is 0°, used for intercepting small particles), the flexible baffle provides a seal at the contact edge of the fixed grid 12 and the rotating grid 13, preventing debris from leaking from the gap (as shown in Figure 2 );

[0140] (5) Reset and debris collection: after the self-cleaning is completed, the servo motor 29 reverses, drives the first filter plate 4 to retreat to the initial position, the first cleaning member 9 is separated from the second filter hole 8, the second cleaning member 10 is separated from the first filter hole 7, and the cleaned out debris falls into the flow channel 3 bottom with water flow or gravity and is collected; the grid plate assembly 6 keeps the set gap or is completely closed according to the actual demand to cut off the water flow, facilitating the equipment maintenance.

[0141] The applicant declares that the above description is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. It should be understood by those skilled in the art that any changes or replacements within the technical scope disclosed by the present application can be easily thought out by any person skilled in the art, and all fall within the protection scope and disclosure scope of the present application.

Claims

1. A wastewater treatment screen with self-cleaning function, characterized in that, The sewage treatment trash screen with self-cleaning function comprises oppositely arranged first and second side walls, and a flow channel is formed between the first and second side walls, wherein a first filter plate, a second filter plate and a grid plate assembly are sequentially arranged in the flow channel along the water flow direction; A plurality of first filter holes and a plurality of second filter holes are respectively formed in the first and second filter plates, and a first cleaning member and a second cleaning member are respectively arranged on the opposite sides of the first and second filter plates and are respectively aligned with the second filter holes and the first filter holes; A driving assembly is arranged outside the first filter plate, and the driving assembly is used to drive the first filter plate to move towards the second filter plate, so that the first and second cleaning members are respectively inserted into the second filter holes and the first filter holes.

2. The trash screen with a self-cleaning function for sewage treatment according to claim 1, characterized in that, The grid plate assembly is perpendicular to the water flow direction in the flow channel, and the grid plate assembly is composed of a plurality of grid plates, including a plurality of fixed grid plates and a plurality of rotating grid plates located in the same plane, and the fixed grid plates and the rotating grid plates are alternately arranged along the horizontal direction; The rotating grid plates are in transmission connection with a rotating assembly, and the rotating assembly is used to drive the rotating grid plates to rotate along the vertical axes of the rotating grid plates, so that the gaps are formed between the fixed grid plates and the rotating grid plates.

3. The trash screen with a self-cleaning function for sewage treatment according to claim 2, characterized in that, The two grid plates close to the first and second side walls in the grid plate assembly are both fixed grid plates, the number of the fixed grid plates is equal to the number of the rotating grid plates plus one, and the number of the fixed grid plates is 6-10; The fixed grid plates and the rotating grid plates are both rectangular and have the same size, and the width of the fixed grid plates and the rotating grid plates is 150-250 mm.

4. The trash screen with a self-cleaning function for sewage treatment according to claim 2, characterized in that, Flexible strips are arranged at the vertical long edges of the fixed grid plates and the rotating grid plates to seal the gaps between the fixed grid plates and the rotating grid plates.

5. The trash screen with a self-cleaning function for sewage treatment according to claim 2, characterized in that, The rotating assembly comprises a transmission shaft, a driving motor, a plurality of driving gears, a plurality of rotating shafts and a plurality of driven gears; The transmission shaft is located directly above the grid plate assembly, the output shaft of the driving motor is in transmission connection with one end of the transmission shaft, and a plurality of driving gears are equidistantly arranged on the transmission shaft along the length direction of the transmission shaft; A rotating shaft is arranged at the vertical axis of each rotating grid plate, and a driven gear is sleeved on the top end of each rotating shaft; The driving motor drives the transmission shaft and the plurality of driving gears on the transmission shaft to rotate simultaneously, drives all the driven gears to rotate through the meshing connection between the driving gears and the driven gears, and drives the rotating grid plates to rotate synchronously through the rotating shafts, so as to change the gap width between the fixed grid plates and the rotating grid plates.

6. The trash screen with a self-cleaning function for sewage treatment according to claim 5, wherein First and second supports are respectively arranged at the top of the first and second side walls, and the two ends of the transmission shaft are respectively in movable connection with the first and second supports. The first support and the second support are respectively provided with a first through hole and a second through hole, both ends of the transmission shaft pass through the first through hole and the second through hole respectively, and both ends of the transmission shaft are provided with transmission bearings at the connection positions with the first through hole and the second through hole.

7. The trash screen with a self-cleaning function for sewage treatment according to claim 1, wherein The first filter hole is an equal-diameter cylindrical through hole; The second filter hole is a circular truncated cone through hole with a diameter gradually decreasing along the water flow direction, an opening of the second filter hole close to one side of the first filter plate is a water inlet, and an opening of the second filter hole away from the other side of the first filter plate is a water outlet, the diameter of the first filter hole > the diameter of the water inlet > the diameter of the water outlet.

8. The trash screen with a self-cleaning function for sewage treatment according to claim 7, characterized in that, The diameter of the first filter hole is 30-50mm; The diameter of the water inlet is 15-25mm; The diameter of the water outlet is 8-15mm.

9. The trash screen with a self-cleaning function for sewage treatment according to claim 1, wherein The driving assembly comprises a first lead screw and a second lead screw, and the axes of the first lead screw and the second lead screw are parallel to the water flow direction; The first filter plate is provided with a first sliding block and a second sliding block with internal threads on both sides close to the first side wall and the second side wall, respectively, and the first sliding block and the second sliding block are screwed into the first lead screw and the second lead screw, respectively; The end of the first lead screw and / or the second lead screw is provided with a servo motor, the servo motor is used to drive the first lead screw and the second lead screw to rotate synchronously, and the first sliding block and the second sliding block move along the first lead screw and the second lead screw, respectively, under the thread engagement, thereby driving the first filter plate to move towards or away from the second filter plate.

10. The trash screen with a self-cleaning function for sewage treatment according to claim 9, wherein The inner walls of the first side wall and the second side wall are respectively provided with a first base and a second base, both ends of the first lead screw and both ends of the second lead screw are movably fixed to the first base and the second base through lead screw bearings, and the first lead screw and the second lead screw are freely rotatable on the first base and the second base, respectively, under the driving of the servo motor.

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