A multi-layered and graded fine hexagonal screen device for clay sand treatment

Abstract

The utility model provides a kind of for clay sand processing multilayer grading fine hexagonal screen device, belong to sand processing technical field, the multilayer grading fine hexagonal screen device for clay sand processing includes screen frame assembly, screen assembly, support assembly and flow guide component, the screen frame assembly is regular hexagon frame structure, six sides of the screen frame assembly are enclosed by rectangular sheet, the screen assembly is fixed in the inside of the screen frame assembly, the screen assembly includes several layers of screen layer, the screen layer is sequentially arranged according to from top to bottom, vertical spacing is kept between each layer of screen layer by interval support, the support assembly is set in the bottom of the screen frame assembly, the support assembly includes base plate and several support legs, the utility model can solve the technical problem that the existing clay sand screening device exists when screening material is unevenly distributed on each layer of screen, leading to the excessive load of local area screen.

Description

Technical Field

[0001] This utility model belongs to the field of sand and gravel treatment technology, specifically, it relates to a multi-layer grading fine hexagonal sieve device for clay sand treatment. Background Technology

[0002] In the foundry industry, clay sand is an important molding material. Used clay sand needs to be processed before it can be reused. One key step in the clay sand processing is to classify and screen sand particles of different sizes for recycling or further processing. Traditional clay sand screening devices often use single- or double-layer planar screen structures with rectangular or circular screen frames. These devices generally suffer from low screening accuracy and low processing efficiency in practical applications. To improve screening accuracy, multi-layer screen devices have emerged, using three or more layers of screens with different mesh sizes to achieve multi-level classification of materials. However, these multi-layer screening devices exhibit significant technical defects during use, primarily manifested in extremely uneven material distribution across the screen layers. Large amounts of material tend to accumulate in certain localized areas of the screen, while other areas are either unloaded or lightly loaded. Uneven distribution leads to excessive material weight and friction on local screen areas, accelerating wear and even causing breakage. Simultaneously, most screen area is not fully utilized, resulting in low overall screening efficiency. The main reason for this problem is the lack of an effective material distribution and guiding mechanism between multiple screen layers. Material falls directly onto the surface of the lower screen after passing through the upper layer, with random landing points, failing to achieve uniform distribution. Furthermore, traditional rectangular or circular screen frames lack structural stability when stacked in multiple layers, easily deforming under vibration or material impact, affecting screen tension and screening accuracy. Existing technologies also employ material distribution devices between screen layers, but these devices are often complex mechanical structures or require additional power, increasing cost and maintenance difficulty, and are prone to malfunction. Therefore, there is an urgent need for a simple, reliable, and uniformly distributed multi-layer grading screening device. Utility Model Content

[0003] In view of this, the present invention provides a multi-layer grading fine hexagonal sieve device for clay sand treatment, which can solve the technical problem of uneven material distribution on each layer of the sieve during the screening of existing clay sand screening devices, resulting in excessive screen load in local areas.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a multi-layer grading fine hexagonal sieve device for clay sand treatment, including a sieve frame assembly, a sieve mesh assembly, a support assembly, and a flow guiding assembly. The sieve frame assembly has a regular hexagonal frame structure, and each of the six sides of the sieve frame assembly is enclosed by rectangular plates. The sieve mesh assembly is fixed inside the sieve frame assembly and includes several sieve mesh layers arranged sequentially from top to bottom. Each sieve mesh layer is vertically spaced by spacer columns. The support assembly is located at the bottom of the sieve frame assembly and includes a base plate and several support legs evenly distributed along the edge of the base plate. The flow guiding assembly is located between two adjacent sieve mesh layers and includes an inclined flow guiding plate. The upper end of the inclined flow guiding plate is fixed to the lower surface of the upper sieve mesh layer, and the lower end of the inclined flow guiding plate points to the geometric center of the lower sieve mesh layer.

[0006] The technical advantages of the multi-layer grading fine hexagonal sieve device for clay sand processing provided by this utility model are as follows: By adopting a regular hexagonal sieve frame component structure in conjunction with the arrangement of multiple sieve layers, the clay sand material forms a stable and uniform distribution as it passes through sieve layers of different specifications from top to bottom. Compared with traditional rectangular or circular structures, the regular hexagonal structure has better structural stability and space utilization. The inclined guide plate is set between adjacent sieve layers and points to the geometric center of the lower sieve layer, which allows the material to be effectively guided to the central area of ​​the lower sieve after passing through the upper sieve, avoiding material concentration at the edges and causing local blockage. The support component provides a stable support foundation for the entire device through the combination structure of the base plate and support legs, ensuring the stability of the device during the screening process.

[0007] Based on the above technical solution, the multi-layer grading fine hexagonal sieve device for clay sand treatment of this utility model can be further improved as follows:

[0008] The six side plates of the screen frame assembly are of equal thickness, and the inner surface of the side plate forms a 120° angle with the inner surface of the adjacent side plate.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By limiting the structural features of the six side plates of the screen frame assembly to have equal thickness and forming a 120° angle between the inner surfaces of adjacent side plates, the geometric accuracy and structural symmetry of the regular hexagonal frame structure are ensured. This uniform angle distribution makes the lateral constraint force on the material during the screening process balanced and consistent, avoiding the decrease in screening efficiency caused by the material being biased to a certain side due to structural asymmetry. At the same time, the equal plate thickness ensures that each side has the same strength and rigidity, improving the reliability of the overall structure.

[0010] Furthermore, the screen layer has a regular hexagonal planar structure, and the edge of the screen layer is closely attached to the inner surface of the six side plates of the screen frame assembly. The screen layer is fixed to the spacer support by welding.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by making the screen layer a regular hexagonal planar structure and the edge tightly attached to the inner surface of the side plate of the screen frame assembly, the gap between the screen layer and the screen frame assembly is eliminated, preventing fine clay and sand particles from escaping from the gaps and affecting the screening accuracy. The connection method of fixing the screen layer to the spacer support by welding provides a strong fixing effect, so that the screen layer will not be displaced or deformed when subjected to material impact and vibration, ensuring the stability of the relative position relationship between the multiple screen layers, thereby maintaining the classification accuracy of the entire screening system.

[0012] Furthermore, the spacer support has a cylindrical structure, the axial direction of the spacer support is perpendicular to the plane direction of the screen layer, and there are 6 spacer supports, which correspond to the six vertices of the screen frame assembly.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by designing the spacer support as a cylindrical structure with its axial direction perpendicular to the plane of the screen layer, vertical support for the screen layer is achieved, avoiding the deformation effect of the lateral component force that may be caused by the oblique support on the screen layer. The arrangement of the six spacer supports corresponding to the six vertices of the screen frame assembly makes the support force evenly distributed in the edge area of ​​the screen layer, forming a peripheral constraint on the screen layer and preventing excessive sagging in the central area of ​​the screen layer due to the weight of the material. This support layout, combined with the symmetrical characteristics of the regular hexagonal structure, keeps each screen layer in a horizontal state.

[0014] Furthermore, the inclined guide plate has a fan-shaped plate structure, and the radial outer edge of the inclined guide plate is fixed to the outer side of the spacer column. The angle between the inclined guide plate and the horizontal plane is 30°~45°.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by designing the inclined guide plate as a fan-shaped plate structure and fixing the radial outer edge to the outer side of the spacer support, the guide plate and the spacer support form an integrated support and guide structure. The fan shape matches the geometry of the regular hexagonal screen layer. The design of the inclined guide plate forming an angle of 30 to 45 degrees with the horizontal plane allows the material to slide down to the center of the lower screen at an appropriate angle after passing through the upper screen. This angle range ensures the smoothness of the material sliding down and avoids damage to the lower screen due to excessive impact force caused by excessive angle. At the same time, the fan-shaped structure makes the material gathering effect more concentrated.

[0016] Furthermore, the base plate has a regular hexagonal planar structure, and a circular discharge hole is provided at the geometric center of the base plate. The diameter of the discharge hole is 1 / 3 of the distance between opposite sides of the base plate.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by making the base plate a regular hexagonal planar structure and opening a circular discharge hole at the geometric center, the unified coordination with the structural form of the screen frame assembly is achieved. The discharge hole is set at the geometric center so that the finest particles after multi-layer screening can be discharged from the center. The diameter of the discharge hole is 1 / 3 of the distance between opposite sides of the base plate, which ensures sufficient discharge channel area and avoids the reduction of base plate strength due to excessively large openings. This central discharge method, combined with the guiding effect of the upper guide plate, forms a reasonable material flow path from edge feeding to central discharge.

[0018] Furthermore, the support leg has a frustum-shaped structure, the upper end area of ​​the support leg is larger than the lower end area of ​​the support leg, the upper end of the support leg is connected to the lower surface of the base plate by bolts, and the axial center line of the support leg is perpendicular to the plane direction of the base plate.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by designing the support leg as a frustum-shaped structure with an upper area larger than the lower area, the support leg has a shape that gradually tapers from top to bottom. When bearing vertical loads, this frustum-shaped structure can gradually transfer stress from the larger upper surface to the smaller lower surface, improving the compressive stability of the support leg. The connection method of the upper end of the support leg to the lower surface of the base plate by bolts facilitates disassembly and maintenance. The positional relationship between the axial center line of the support leg and the plane of the base plate ensures that the vertical support force transmission path is the shortest and no bending moment is generated, thus improving the support efficiency and structural reliability.

[0020] Furthermore, the six side plates of the screen frame assembly are made of stainless steel, and the screen mesh layer is woven from polyurethane material.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by using stainless steel to make the side plates of the screen frame assembly, the screen frame has good corrosion resistance and mechanical strength, and can adapt to the humid environment and material impact that may exist in the clay sand processing process. The screen mesh layer woven from polyurethane material has excellent wear resistance and a certain degree of elasticity, and is not easily damaged under repeated scouring and friction of materials. Compared with metal screen mesh, polyurethane material has better anti-clogging performance because its surface is smooth and has a certain degree of flexibility, and is not easily stuck by clay sand particles. This combination of materials makes the device have a long service life and good screening performance.

[0022] Furthermore, the mesh of the screen layer has a square structure, all meshes on the same screen layer have the same size, and the mesh size of each screen layer decreases sequentially from top to bottom.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By designing the mesh of the screen layer as a square structure and ensuring that all mesh sizes on the same screen layer are the same, precise control of the throughput of the screen layer is achieved. Compared with irregular mesh, square mesh has a clear geometric dimension definition and a unified throughput standard. The gradient design of the mesh size of each screen layer decreasing from top to bottom enables clay sand materials to be screened from coarse to fine when passing through multiple screens. Each screen layer retains particles within a specific size range, ultimately achieving fine grading of the material. This gradient screening method avoids the problem of low screening efficiency caused by the large span of mesh size in a single screen layer.

[0024] Furthermore, the length of the spacer support is one-fifth of the distance between opposite sides of the screen frame assembly, and the radial length of the inclined guide plate is half the distance from the geometric center to the edge of the screen layer.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by limiting the length of the interval support to one-fifth of the distance between opposite sides of the screen frame assembly, an appropriate vertical spacing is ensured between adjacent screen layers. This spacing not only meets the buffering and dispersion needs of materials between the two screen layers, but also avoids the overall height of the device being too high due to excessive spacing, which would affect the structural stability. The radial length of the inclined guide plate is designed to be half the distance from the geometric center to the edge of the screen layer, so that the guide plate covers the middle area of ​​the screen layer. This coverage area can effectively guide most of the materials passing through the upper screen to converge to the center of the lower screen, while retaining direct passage space in the outer area, and avoiding the guide plate area being too large to obstruct the flow of materials.

[0026] Compared with existing technologies, the beneficial effects of the multi-layer grading fine hexagonal sieve device for clay sand treatment provided by this utility model are as follows: This utility model, by adopting a regular hexagonal sieve frame assembly combined with a multi-layer sieve mesh layer overall structural design, and combining the guiding effect of the inclined guide plates between layers, fundamentally solves the technical problem of uneven material distribution during multi-layer sieving. Compared with the traditional rectangular structure, the regular hexagonal frame structure has six symmetrically distributed support points, which improves structural stability and can more evenly bear the material load. The sieve mesh layer adopts a regular hexagonal planar structure that matches the sieve frame assembly and is supported by six spaced pillars at the vertices, forming a balanced support system. The innovative design of the inclined guide plates being set between adjacent sieve mesh layers and pointing towards the geometric center of the lower sieve mesh ensures that the material is orderly guided to the central area of ​​the lower sieve mesh after passing through the upper sieve mesh, avoiding localized material scattering caused by random material spillage. The stacking process achieves uniform material distribution on the surface of each screen layer. This uniform distribution significantly improves the effective utilization rate of the screen, extends its service life, and enhances screening efficiency and grading accuracy. The gradient configuration of the screen layer mesh size decreasing from top to bottom enables progressively fine screening of clay sand materials. Each screen layer undertakes the separation task within a specific particle size range, resulting in a more concentrated and precise particle size distribution of the final material at each level. The support component adopts a combination structure of frustoconical support legs and a regular hexagonal base plate, which not only provides a stable support foundation for the entire device, but also forms a complete material flow path with the circular discharge hole in the center of the base plate and the flow guiding system. In terms of material selection, a combination of stainless steel screen frame and polyurethane screen is used, taking into account the comprehensive requirements of structural strength, corrosion resistance and wear resistance, enabling the device to maintain stable performance under long-term continuous working conditions. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A cross-sectional view of a multi-layer grading fine hexagonal sieve device for clay sand treatment;

[0029] Figure 2 A top view of a multi-layer grading fine hexagonal sieve device for clay sand treatment;

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 10. Screen frame assembly; 20. Screen mesh assembly; 30. Support assembly; 31. Base plate; 32. Support leg; 40. Flow guide assembly. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0033] like Figure 1-2 The diagram shows an embodiment of a multi-layer grading fine hexagonal sieve device for clay sand treatment provided by this utility model. In this embodiment, it includes a sieve frame assembly 10, a sieve mesh assembly 20, a support assembly 30, and a flow guiding assembly 40. The sieve frame assembly has a regular hexagonal frame structure, and all six sides of the sieve frame assembly are enclosed by rectangular plates. The sieve mesh assembly is fixed inside the sieve frame assembly and includes several sieve mesh layers arranged sequentially from top to bottom. Each sieve mesh layer is kept vertically spaced by a spacer column. The support assembly is located at the bottom of the sieve frame assembly and includes a base plate 31 and several support legs 32. The support legs are evenly distributed along the edge of the base plate. The flow guiding assembly is located between two adjacent sieve mesh layers and includes an inclined flow guiding plate. The upper end of the inclined flow guiding plate is fixed to the lower surface of the upper sieve mesh layer, and the lower end of the inclined flow guiding plate points to the geometric center of the lower sieve mesh layer.

[0034] In the above technical solution, the six side plates of the screen frame assembly have equal thickness, and the inner surface of the side plate forms a 120° angle with the inner surface of the adjacent side plate.

[0035] Furthermore, in the above technical solution, the screen layer has a regular hexagonal planar structure, the edge of the screen layer is closely attached to the inner surface of the six side plates of the screen frame assembly, and the screen layer is fixed to the spacer support by welding.

[0036] Furthermore, in the above technical solution, the spacer support has a cylindrical structure, the axial direction of the spacer support is perpendicular to the plane direction of the screen layer, and there are 6 spacer supports, which correspond to the six vertices of the screen frame assembly.

[0037] Furthermore, in the above technical solution, the inclined guide plate has a fan-shaped plate structure, the radial outer edge of the inclined guide plate is fixed to the outer side of the spacer support, and the angle between the inclined guide plate and the horizontal plane is 30°~45°.

[0038] Furthermore, in the above technical solution, the base plate has a regular hexagonal planar structure, and a circular discharge hole is opened at the geometric center of the base plate. The diameter of the discharge hole is 1 / 3 of the distance between opposite sides of the base plate.

[0039] Furthermore, in the above technical solution, the support leg has a frustum-shaped structure, the upper end area of ​​the support leg is larger than the lower end area of ​​the support leg, the upper end of the support leg is connected to the lower surface of the base plate by bolts, and the axial center line of the support leg is perpendicular to the plane direction of the base plate.

[0040] Furthermore, in the above technical solution, the six side plates of the screen frame assembly are made of stainless steel, and the screen mesh layer is woven from polyurethane material.

[0041] Furthermore, in the above technical solution, the mesh of the screen layer has a square structure, all the meshes on the same screen layer have the same size, and the mesh size of each screen layer decreases sequentially from top to bottom.

[0042] Furthermore, in the above technical solution, the length of the spacer support is one-fifth of the distance between opposite sides of the screen frame assembly, and the radial length of the inclined guide plate is half the distance from the geometric center to the edge of the screen layer.

[0043] First, place the device on a flat surface. Adjust the position of the support legs to ensure the base plate is level. Check that each screen layer is taut and level, and that the screen and frame are tightly fitted without gaps. Confirm that the inclined guide plate is securely fixed and correctly oriented. Feed the clay sand material to be processed through the opening at the top of the screen frame assembly. The material first falls onto the surface of the uppermost screen layer. Under its own gravity, fine particles smaller than the mesh size of the upper screen pass through and fall onto the surface of the inclined guide plate below. Coarse particles larger than the mesh size are trapped on the upper screen. The material passing through the upper screen slides down the inclined guide plate surface to the center area of ​​the lower screen, accumulating and gradually spreading outwards, forming a relatively uniform distribution on the lower screen surface. Subsequently, even finer particles smaller than the mesh size of the lower screen continue to pass through the screen and fall onto the next lower guide plate, repeating the aforementioned guiding and distribution process. This process continues, with the material passing through multiple screens. Through step-by-step screening, particles of different sizes are intercepted by each layer of screens. The smallest particles eventually fall through the bottom screen onto the base plate and are discharged from the circular discharge hole in the center of the base plate. During the entire screening process, operators should observe the material accumulation on each layer of screens. If too much material is found on a certain layer of screens, the feeding speed should be reduced or feeding should be paused until the material in that layer has fully passed through the screen before feeding can continue. Regularly check the screens for damage or blockage. If there is damage, the screen should be replaced in time. If there is blockage, the screen surface should be cleaned. Check whether there is any material adhering to the surface of the guide plate. If there is any accumulation, it should be removed to keep the surface of the guide plate smooth. When it is necessary to replace the screens of different specifications, first remove the fixing parts on the interval support, take out the old screen layer, install the new screen layer, and ensure that the edge of the screen fits tightly with the inner surface of the screen frame. Then, re-fix the interval support. The entire device has a simple structure and is easy to operate. No professional skills are required to complete daily use and maintenance.

[0044] The following is a specific embodiment 1 of this utility model: This embodiment provides a multi-layer grading fine hexagonal sieve device for recycling old sand in a foundry workshop. The sieve frame assembly is welded from 304 stainless steel plate with a thickness of 5mm, forming a regular hexagonal frame with a side-to-side distance of 800mm and a frame height of 1200mm. The inner surfaces of the six side plates form 120-degree internal angles between each other, ensuring the geometric accuracy of the regular hexagon. The sieve frame assembly has four layers of sieve mesh inside, with a vertical spacing of 240mm between each layer from top to bottom. The sieve mesh is made of polyurethane woven mesh. The hardness of polyurethane material is Shore A 85, which has excellent wear resistance and a certain degree of elasticity. The mesh size of the first layer of sieve mesh is 6mm x 6mm square holes, the mesh size of the second layer of sieve mesh is 3mm x 3mm, the mesh size of the third layer of sieve mesh is 1.5mm x 1.5mm, and the mesh size of the fourth layer of sieve mesh is 0.8mm x 0.Each screen layer is cut into a regular hexagon with a side-to-side distance of 790mm. The screen edges are pressed against the inner surface of the screen frame assembly by stainless steel strips. The spacer supports are made of 30mm diameter stainless steel round bars, and six spacer supports are welded to the inner side of the six vertices of the screen frame assembly, extending from the bottom surface of the top first screen layer to the bottom screen layer. The screen layers are fixed to the corresponding height positions of the spacer supports by spot welding. The inclined guide plates are made of 3mm thick stainless steel sheet stamped into a fan shape. Each fan-shaped guide plate has a central angle of 60 degrees and a radial length of 350mm, which exactly covers half the distance from the center to the edge of the screen layer. Six fan-shaped guide plates are installed under each screen layer, evenly distributed around the center of the screen. Adjacent guide plates... The gap between the plates is 10mm. The upper end of the guide plate is fixed to the lower surface of the upper screen layer with bolts. The angle between the guide plate and the horizontal plane is 38 degrees. This angle, after actual testing, allows clay sand particles to slide smoothly without excessive impact. The base plate of the support assembly is made of 8mm thick stainless steel plate, in the shape of a regular hexagon with a side-to-side distance of 820mm, slightly larger than the screen frame assembly for connection with the bottom of the screen frame. A circular discharge hole with a diameter of 270mm is opened at the geometric center of the base plate. The edge of the discharge hole is turned down 20mm to form a guide edge. The support legs are 6 frustoconical stainless steel tubes with an upper outer diameter of 60mm, a lower outer diameter of 50mm, and a height of 600mm. The frustoconical structure gives the support legs good stability. The upper end is fixed to the lower surface of the base plate 80mm from the edge by flanges and bolts. Six support legs are evenly distributed along the edge of the base plate, corresponding to the six vertices of a regular hexagon. Rubber pads are installed at the lower ends of the support legs to increase friction with the ground and provide shock absorption. The total height of the entire device is approximately 1850mm, and the total weight is approximately 180kg. During use, the old clay sand to be processed is fed in from the top. Coarse particles are retained by the first layer of screens, medium particles by the second and third layers, fine particles by the fourth layer, and the finest dust-like particles are discharged from the central discharge hole of the base plate. The guiding effect of the inclined guide plate ensures that the material is evenly distributed from the center to the periphery on each layer of screens, avoiding local accumulation. Actual testing... Application verification shows that the material distribution on each layer of the screen is uniform, the screen utilization rate is high, and the screening efficiency is significantly improved compared to traditional multi-layer screening devices with rectangular screen frames. The service life of the screens is extended. The regular hexagonal screen frame structure exhibits excellent structural stability when bearing material loads, and the screen frame does not deform significantly even under continuous operation. The polyurethane screen material has self-cleaning properties and is not easily clogged by clay and sand particles. Even if a small number of particles are stuck in the mesh, they can be dislodged by the slight vibration of the screen. The entire device adopts a modular design, and the screens of each layer can be replaced with screens of different mesh sizes according to actual needs to adapt to different particle size classification requirements. The device is easy to maintain; only periodic checks for screen damage and cleaning of the guide plate surface are required.

[0045] The following is another specific embodiment 2 of this utility model: This embodiment 2 is based on embodiment 1, and the structure of the inclined guide plate is improved. The surface of the fan-shaped guide plate is processed into a corrugated structure with several radial ribs. The height of the ribs is 2mm, the spacing between the ribs is 40mm, and the ribs extend along the radial direction of the guide plate. This corrugated structure increases the friction of the guide plate surface, making the speed of clay sand particles sliding down the guide plate surface more stable and controllable, avoiding the impact and accumulation of particles in the center of the lower screen due to excessive sliding speed. At the same time, the corrugated structure also plays a diversion role, and the channels formed between adjacent ribs divide the material into several streams. The material converges towards the center, resulting in a more uniform distribution after reaching the center of the lower screen. Furthermore, a detachable collection funnel is added below the discharge hole on the base plate. The funnel is made of 304 stainless steel, with an upper diameter of 270mm (the same as the discharge hole) and a lower diameter of 150mm. The funnel is 300mm high and secured to the lower surface of the base plate with snap-fit ​​mechanisms for easy disassembly and cleaning. The funnel design ensures that the finest particles discharged from the discharge hole are collected centrally, preventing scattering and environmental pollution. A flexible hose can be connected to the lower end of the funnel to transport fine particles to a designated collection container. These improvements make the device more convenient and practical in real-world applications.

[0046] The following is another specific embodiment 3 of this utility model: This embodiment 3 is based on embodiment 1, and optimizes and improves the fixing method of the screen layer. The welding fixing method between the screen layer and the spacer support is cancelled, and a detachable clamp fixing structure is adopted instead. An annular groove is processed at the corresponding height position of each spacer support. The groove width is 8mm and the depth is 2mm. A stainless steel open-type clamp is made to match. The inner diameter of the clamp is similar to the outer diameter of the spacer support. The clamp has an arc-shaped opening with bolt connection holes at both ends. A reinforcing ring is set at the edge of the screen layer at the corresponding spacer support position. The reinforcing ring is integrally molded from polyurethane material, and its inner diameter is slightly larger than the outer diameter of the spacer support. When installing the screen... The reinforcing ring of the screen is placed on the spacer support and aligned with the annular groove. Then, the open clamp is inserted into the groove and tightened with bolts. The clamp both engages with the groove and secures the reinforcing ring of the screen, achieving a firm fixation. This detachable fixing method makes screen replacement very convenient. Simply loosen the clamp bolts to remove the old screen, install the new screen, and retighten the clamp to complete the replacement. The entire process requires no welding or cutting, greatly reducing maintenance difficulty and time costs. At the same time, this fixing method also allows for fine-tuning of the screen tension. By adjusting the tightening force of the clamp, the tension of the screen can be controlled to ensure that the screen always remains flat and not loose, improving screening accuracy and screen lifespan.

[0047] Specifically, the principle of this invention is as follows: The uniform distribution and orderly flow of materials on the multi-layer screen are achieved through the synergistic effect of the regular hexagonal screen frame assembly and the inclined guide plate. The regular hexagonal structure has six evenly distributed vertices and six sides of equal length. This highly symmetrical geometry ensures that the stress state of the screen frame under material load tends to be consistent in all directions, preventing stress concentration in any particular direction. Compared to the four-vertical support of a rectangular screen frame, the six-vertical support of the regular hexagon provides more support paths and a more uniform load distribution. From a structural mechanics perspective, the regular hexagonal frame has stronger resistance to deformation. The screen layer adopts a regular hexagonal planar structure that matches the screen frame, ensuring a tight fit between the screen edge and the inner surface of the screen frame. The seamless design eliminates the possibility of material escaping from the edges. Six spaced supports are positioned at the six vertices of the screen frame, forming a peripheral constraint on the screen layer. This constraint ensures that the screen bears the weight of the material evenly across the entire plane, preventing excessive sagging in the central area. The inclined guide plate is a key component for achieving uniform material distribution. The guide plate is positioned between adjacent screen layers, with its upper end fixed to the lower surface of the upper screen and its lower end pointing towards the geometric center of the lower screen. When material passes through various positions on the upper screen, it falls onto the surface of the inclined guide plate. Because the guide plate is fan-shaped and inclined towards the center, the material slides along the guide plate surface to the central area of ​​the lower screen under the influence of gravity. The angle between the guide plate and the horizontal plane is set between 30° and 45°. Within this range, the angle is determined based on the friction coefficient and sliding characteristics of clay sand particles. If the angle is too small, the material slides slowly or even stops; if the angle is too large, the material slides too fast, causing a large impact on the lower screen. An angle range of 30 to 45 degrees ensures smooth material sliding while controlling the sliding speed. Multiple fan-shaped guide plates are arranged around the center of the screen, forming a centripetal converging guide channel. This allows material passing through different positions on the upper screen to be guided to the central area of ​​the lower screen. The material first accumulates in the central area and then diffuses to the periphery. This process achieves a redistribution of material on the screen surface. Since the distance and path of material diffusion from the center to the periphery are symmetrical with respect to all directions of the regular hexagonal screen, Therefore, the final material distribution is uniform. This material concentration and redispersion mechanism achieved through the guide plate fundamentally changes the situation of random material scattering in traditional multi-layer screening devices. The configuration of the screen mesh size decreasing from top to bottom ensures that coarse particles are intercepted in the upper layer, medium particles in the middle layer, and fine particles in the lower layer. The finest particles are discharged from the discharge hole in the center of the base plate through all screen layers. Each screen layer only undertakes the screening task of a specific particle size range, reducing the load on a single screen layer and improving screening efficiency. The entire device does not require external power drive and relies entirely on the material's own gravity and the geometric guidance of the guide plate to achieve orderly flow and uniform distribution of the material. The structure is simple, reliable, and easy to maintain.

[0048] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A multi-layer grading fine hexagonal sieve device for clay sand treatment, comprising a sieve frame assembly, a sieve mesh assembly, a support assembly, and a flow guiding assembly, wherein the sieve frame assembly has a regular hexagonal frame structure, and each of the six sides of the sieve frame assembly is enclosed by rectangular plates; the sieve mesh assembly is fixed inside the sieve frame assembly; the sieve mesh assembly comprises several sieve mesh layers arranged sequentially from top to bottom, and the sieve mesh layers are kept vertically spaced by spacer supports; characterized in that... The support assembly is disposed at the bottom of the screen frame assembly. The support assembly includes a base plate and several support legs. The support legs are evenly distributed along the edge of the base plate. The flow guiding assembly is disposed between two adjacent screen layers. The flow guiding assembly includes an inclined flow guiding plate. The upper end of the inclined flow guiding plate is fixed to the lower surface of the upper screen layer, and the lower end of the inclined flow guiding plate points to the geometric center of the lower screen layer.

2. The multi-layer grading fine hexagonal sieve device for clay sand treatment according to claim 1, characterized in that, The six side plates of the screen frame assembly are of equal thickness, and the inner surface of the side plate forms a 120° angle with the inner surface of the adjacent side plate.

3. The multi-layer grading fine hexagonal sieve device for clay sand treatment according to claim 2, characterized in that, The screen layer has a regular hexagonal planar structure, and the edge of the screen layer is closely attached to the inner surface of the six side plates of the screen frame assembly. The screen layer is fixed to the spacer support by welding.

4. A multi-layer grading fine hexagonal sieve device for clay sand treatment according to claim 3, characterized in that, The spacer support has a cylindrical structure, and the axial direction of the spacer support is perpendicular to the plane direction of the screen layer. There are 6 spacer supports, which correspond to the six vertices of the screen frame assembly.

5. A multi-layer grading fine hexagonal sieve device for clay sand treatment according to claim 4, characterized in that, The inclined guide plate has a fan-shaped structure, and the radial outer edge of the inclined guide plate is fixed to the outer side of the spacer column. The angle between the inclined guide plate and the horizontal plane is 30°~45°.

6. A multi-layer grading fine hexagonal sieve device for clay sand treatment according to claim 5, characterized in that, The base plate has a regular hexagonal planar structure, and a circular discharge hole is provided at the geometric center of the base plate. The diameter of the discharge hole is 1 / 3 of the distance between opposite sides of the base plate.

7. A multi-layer grading fine hexagonal sieve device for clay sand treatment according to claim 6, characterized in that, The support leg has a frustum-shaped structure, with the upper end area of ​​the support leg being larger than the lower end area. The upper end of the support leg is bolted to the lower surface of the base plate, and the axial center line of the support leg is perpendicular to the plane direction of the base plate.

8. A multi-layer grading fine hexagonal sieve device for clay sand treatment according to claim 7, characterized in that, The six side plates of the screen frame assembly are made of stainless steel, and the screen mesh layer is woven from polyurethane.

9. A multi-layer grading fine hexagonal sieve device for clay sand treatment according to claim 8, characterized in that, The mesh of the screen layer has a square structure, and all the meshes on the same screen layer are the same size. The mesh size of each screen layer decreases sequentially from top to bottom.

10. A multi-layer grading fine hexagonal sieve device for clay sand treatment according to claim 9, characterized in that, The length of the spacer support is one-fifth of the distance between opposite sides of the screen frame assembly, and the radial length of the inclined guide plate is half the distance from the geometric center to the edge of the screen layer.

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