Intelligent large-yield symmetric screening and impurity removing equipment and method

Abstract

The equipment integrates a winnowing system and a screen body, the winnowing system adopts a closed-loop circulating air path to realize separation of light impurities, the screen body is suspended through a hoisting mechanism, a primary cleaning layer, a cleaning layer and an inspection layer are arranged in the screen body, and a uniform distribution and material uniformizing device is matched to realize bilateral symmetrical screening of materials; meanwhile, a drawable modularized transmission module, a hoisting mechanism capable of being rapidly adjusted and an elastic limiting device are arranged, and various types of collecting channels are externally arranged to achieve classified collection of impurities and clean grains. According to the method, the whole-process impurity removal is completed through five steps of winnowing impurity removal, preliminary cleaning and screening, uniform distribution and diversion, grading impurity removal and reinspection and screening. Air and screen integration is achieved, front-path preliminary cleaning equipment is omitted, the treatment capacity is larger than or equal to 500 tons per hour, the impurity removal precision is high, operation and maintenance are convenient and fast, and the large-scale intelligent production requirement is met.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of grain screening equipment, and particularly relates to an intelligent large-yield symmetrical screening and impurity removing equipment and method. BACKGROUND

[0002] In the industrial fields of grain storage, feed production and food processing, material screening and impurity removing is a key process for ensuring product quality and maintaining the stability of production equipment. During harvesting, transportation and storage, large and small impurities and light impurities are easily mixed into the material, which can reduce the quality of the material and wear out the subsequent processing equipment. Therefore, efficient impurity removing is crucial.

[0003] However, the traditional screening and impurity removing technology has many defects. On the one hand, the wind selection and screening processes are scattered and fragmented, and wind selection and screening equipment need to be configured separately, resulting in complex equipment layout, large occupation, and high equipment procurement, installation and operation and maintenance costs. On the other hand, in order to remove oversized impurities, the traditional process needs to separately configure a preliminary cleaning device at the front end of the screening device, further increasing the investment scale. At the same time, the structure design of the traditional screening device and the material uniformity effect are not good, the material is not evenly distributed on the screen surface, the classification and removal precision of large and small impurities is insufficient, and the impurity removal rate is usually less than 70%, which is difficult to meet the high-quality production demand. And limited by the design of the screen box structure, the transmission system and the process efficiency, the economic output of most traditional equipment is concentrated in 200-300 tons / hour, which cannot adapt to the trend of large-scale production of ≥500 tons / hour.

[0004] In addition, the traditional equipment has low intelligence level, and the material uniformity, impurity content detection and flow control all depend on manual operation, which has low control precision, slow response and is prone to cause faults due to manual inspection omissions.

[0005] In summary, the traditional screening and impurity removing technology has significant shortcomings in process integration, equipment economy, impurity removing efficiency, yield adaptability and intelligence level, and cannot meet the needs of modern industry for "large yield, high efficiency and intelligence" screening and impurity removing. An innovative device that can realize the integration of wind selection and multi-stage screening, eliminate the preliminary cleaning device, have large-yield processing capacity and integrate intelligent control function is needed to promote the upgrading and iteration of screening and impurity removing technology. SUMMARY

[0006] In view of the above problems, the application provides an intelligent large-yield symmetrical screening and impurity removing equipment, which realizes the integration of wind selection and multi-stage screening, eliminates the preliminary cleaning device, improves the impurity removal rate and yield, and integrates intelligent control function, thereby reducing the cost and meeting the needs of large-scale intelligent production.

[0007] The technical scheme adopted by the present application is as follows: an intelligent large-output symmetrical screening and impurity removing device, comprising a winnowing system and a screen body; the winnowing system is arranged above a rack, and materials passing through the winnowing system enter the screen body; the screen body is suspended below the rack through a hoisting mechanism; a uniform material distribution device is arranged in the middle of the screen body and is used for distributing the materials to both sides of the screen body for symmetrical screening; external collection channels are arranged on both sides of the screen body and are used for guiding the impurities and pure materials screened by the screen body out of the device respectively; the rack is supported by rack legs connected to the rack; a transmission module is arranged in the screen body and is used for driving the screen body to rotate; an elastic limiting device is arranged below the screen body and is used for preventing the screen body from colliding with the rack legs.

[0008] Further, the winnowing system comprises a feeding port, a self-circulating fan, a soundproof chamber, a return air duct, a first material guide plate, a dust falling chamber and a first discharging port; the self-circulating fan, the soundproof chamber, the return air duct and the dust falling chamber are sequentially connected and constitute a circulating air path inside the screening device; the feeding port is arranged at the top of the device, the first material guide plate is arranged below the feeding port, and the first discharging port is arranged at the bottom of the screening device, so that the return air duct passes through the first discharging port and is connected above the dust falling chamber.

[0009] Further, the screen body comprises a primary cleaning screen layer, a cleaning screen layer, an inspection screen layer and a uniform material distribution device; the primary cleaning screen layer is arranged above the cleaning screen layer and is used for removing oversized impurities; the cleaning screen layer is arranged above the inspection screen layer and comprises a small-impurity cleaning section and a large-impurity cleaning section; the small-impurity cleaning section is used for removing small impurities, and the large-impurity cleaning section is used for removing large impurities; the inspection screen layer is used for screening the grain that is not screened out in the large-impurity cleaning section; and the uniform material distribution device is arranged below the primary cleaning screen layer and is used for concentrating and guiding the material flow between the cleaning screen layers.

[0010] Further, the uniform material distribution device comprises an outer shell, an upper material distribution assembly and a lower uniform material distribution assembly in the outer shell; the upper material distribution assembly comprises width-uniform material distribution partitions, and oppositely inclined material guide plates are arranged in the adjacent material distribution partitions; the lower part of the material guide plate is provided with a middle partition plate, which divides the lower uniform material distribution assembly into two independent areas; a channel partition plate corresponding to the material distribution partition is arranged in each independent area of the lower uniform material distribution assembly; adjacent channel partition plates form a plurality of material channels; second discharging ports corresponding to screen grid assemblies are respectively formed in the outer shell surfaces of the material channels; and a discharging plate guides the uniformly distributed material in the material channels out of the second discharging ports, so as to realize the uniform distribution of the material on both sides.

[0011] Further, the transmission module comprises a module frame and a modular transmission box arranged on the module frame; the modular transmission box comprises a fixing frame, the fixing frame is provided with a front fixing plate and a rear fixing plate, sliding wheels are arranged on the two sides of the fixing frame, a maintenance and replacement opening is formed in the fixing frame, a transmission shaft is arranged in the middle of the fixing frame, and a flyweight is arranged on the transmission shaft; guide rails are arranged on the module frame, and the modular transmission box can be pulled out of the module frame through the sliding wheels and the guide rails.

[0012] Further, the hoisting mechanism comprises a reinforcing support frame, an adjusting plate is arranged on the reinforcing support frame, the adjusting plate and the long-hole fixing plate on the frame are connected through at least one set of clamping bolts to realize position adjustment of the two in the vertical direction; a rotating wheel is installed at the bottom of the reinforcing support frame through a pin shaft, a steel wire rope is wound around the rotating wheel, and a hanging seat is connected to the end of the steel wire rope.

[0013] Further, the cleaning screen layer is composed of two or more screen grid assemblies stacked, the screen grid assembly comprises: a screen plate, the screen plate is divided into a small impurity cleaning section and a large impurity cleaning section along the material flow direction, small holes are arranged in the small impurity cleaning section, and large holes are arranged in the large impurity cleaning section; a bottom plate is arranged below the screen plate, the bottom plate is inverted V-shaped, the tip of the bottom plate is arranged at the middle part of the bottom plate along the material flow direction, and a full-length plate rib perpendicular to the tip is arranged on the bottom plate to divide the bottom plate into two sections corresponding to the small impurity cleaning section and the large impurity cleaning section.

[0014] Further, a flow guide structure is arranged on the bottom plate.

[0015] Further, an elastic limiting device is arranged below the screen body, the elastic limiting device comprises a mounting frame and a limiting spring arranged on the mounting frame, the limiting spring comprises a limiting outer shell, a limiting spring and an inner spring fixing plate, the limiting spring is arranged between the limiting outer shell and the inner spring fixing plate, and an extension rod is inserted into a ring-shaped space formed in the inner spring fixing plate.

[0016] The application further discloses an intelligent large-yield symmetrical screening and impurity removing method.

[0017] Step 1, wind selection and impurity removal: the material to be screened is put into the feed inlet of the wind selection system, guided to the material uniformizing plate of the eccentric transmission material uniformizing mechanism through the first material guide plate, and the rotating shaft is driven to reciprocate by the actuator, the opening angle of the material uniformizing plate is adjusted by the eccentric weight, the material slides to the first discharge port at a uniform flow rate, a self-circulating fan is started at the same time, air flow passes through the noise reduction chamber, is transported to the upper part of the first discharge port through the return air duct, passes through the material layer from top to bottom to separate light impurities, the air flow carrying the impurities enters the dust settling chamber to settle, the settled impurities are pushed to the impurity discharge port by the impurity discharge auger, and the material selected by the wind selection is discharged from the first discharge port into the screen body.

[0018] Step 2, initial screening: the material first enters the initial cleaning screen layer of the screen body, intercepts and removes oversized impurities in the material, and the oversized impurities are guided out of the oversized impurity collection channel;

[0019] Step 3, uniform flow guide: the material after initial cleaning enters the uniform material distribution device, and is first distributed by the distribution baffle of the upper material distribution assembly and the second material guide plate, and then is guided by the material channel formed by the channel baffle in the lower uniform material distribution assembly separated by the middle baffle, and the material is uniformly distributed from the second discharge port to the cleaning screen layer on both sides of the screen body by the discharge plate;

[0020] Step 4, graded impurity removal: after the material enters the cleaning screen layer, small impurities are removed by the small hole screen plate of the small impurity cleaning section, and the small impurities are guided out of the small impurity collection channel, and then large impurities are separated by the large hole screen plate of the large impurity cleaning section, and the clean grain enters the clean grain collection channel through the bottom plate flow guide structure, and the large impurities fall to the inspection screen layer through the cleaning screen layer;

[0021] Step 5, re-screening: the material in the cleaning screen layer enters the inspection screen layer, and the clean grain that is not screened in the previous process is screened out, and the large impurities are guided out of the large impurity collection channel, and the whole process of material screening and impurity removal is completed.

[0022] The beneficial effects of the present application are:

[0023] 1. The present application realizes the integrated design of air separation and multi-stage screening, integrates the air separation system and the screen body in the same rack, saves the front cleaning equipment that needs to be separately configured in the traditional process, greatly reduces the cost of equipment purchase, installation and site occupation, and avoids the complex layout problem caused by the separation of air separation and screening process.

[0024] 2. The air separation system adopts an internal circulating air path, and a closed loop air path is formed by a self-circulating fan, a soundproof room, an air return duct and a dust falling room, without the need for external air network, which not only reduces the energy loss of the air path and meets the energy saving and environmental protection needs, but also eliminates dust overflow and improves the working environment. The eccentric drive material uniformizing mechanism can accurately adjust the material flow rate through sensors and actuators, realize material uniformization automation, reduce manual dependence, improve control accuracy and response speed, and reduce the risk of faults caused by manual inspection omissions.

[0025] 3. The uniform material distribution device provided in the screen body can uniformly distribute the material to the screen layers on both sides, ensure consistent screening load, avoid the decrease of screening accuracy caused by uneven load of the material, and realize the accurate grading and removal of oversized impurities, small impurities and large impurities through the step-by-step screening of the initial cleaning screen layer, the cleaning screen layer and the inspection screen layer, thereby greatly improving the overall impurity removal rate;

[0026] 4. The cleaning screen layer adopts a segmented screen plate and a reverse V-shaped bottom plate guide structure, which is matched with rubber cleaning balls to prevent screen hole blockage, thereby strengthening impurity separation efficiency and ensuring the continuity of screening operation; and the equipment can meet a processing capacity of ≥500 tons / hour, adapt to large-scale production needs, and far exceed the economic output of 200-300 tons / hour of traditional equipment.

[0027] 5. The hoisting mechanism supports rapid horizontal level adjustment, and through the cooperation of clamping bolts and tension adjustment bolts, the single screen corner height adjustment time is shortened to within 3 minutes, and the punching calibration step of traditional rigid hoisting is omitted; flexible steel wire rope hoisting can buffer equipment vibration, avoid stress concentration of rigid connection, and improve operation stability.

[0028] 6. The transmission module adopts a drawable modular transmission box, which can be completely drawn out for maintenance without disassembling the screen body, and is matched with multidirectional maintenance and replacement openings, thereby greatly reducing maintenance difficulty and downtime; the clamping device can ensure the stability of the transmission box during operation, and takes into account the convenience of maintenance and the reliability of operation.

[0029] 7. The elastic limiting device below the screen body converts the rigid collision of the screen body during start and stop into elastic buffering, avoids direct contact between the screen body and the rack leg, prolongs the service life of the components, and ensures the continuous and stable operation of the equipment.

[0030] 8. The external multi-type collection channel can realize the classified collection of different impurities and clean grain, facilitate subsequent impurity centralized treatment and material recycling, and improve resource utilization rate and separation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of the present application;

[0032] Figure 2 is a schematic diagram of the structure of the winnowing system in the present application Figure 1 ;

[0033] Figure 3 is a schematic diagram of the structure of the winnowing system in the present application Figure 2 ;

[0034] Figure 4 is a schematic diagram of the structure of the screen body in the present application;

[0035] Figure 5 is a schematic diagram of the structure of the uniform material distribution device in the present application;

[0036] Figure 6 is a side view of the uniform material distribution device in the present application;

[0037] Figure 7 is a front view of the uniform material distribution device in the present application;

[0038] Figure 8Structure diagram of the screen assembly in the application;

[0039] Figure 9 Structure explosion diagram of the screen assembly in the application;

[0040] Figure 10 Assembly diagram of the external collection channel in the application;

[0041] Figure 11 Side structure diagram of the external collection channel in the application;

[0042] Figure 12 Structure diagram of the hoisting mechanism in the application;

[0043] Figure 13 Structure diagram of the fine-tuning hoisting mechanism body in the application;

[0044] Figure 14 Structure diagram of the limiter in the application;

[0045] Figure 15 Assembly diagram of the elastic limiting device in the application;

[0046] Figure 16 Use state diagram of the elastic limiting device in the application;

[0047] Figure 17 Structure diagram of the transmission module in the application;

[0048] Figure 18 Structure diagram of the modular transmission box rack in the application;

[0049] Figure 19 Structure diagram of the modular transmission box in the application;

[0050] Figure 20 Structure diagram of the clamping mechanism in the application;

[0051] Figure 21 Side sectional view of the clamping mechanism in the application;

[0052] In the figure: 100-wind election system, 101-feeding port, 102-self-circulation fan, 103-soundproof room, 104-return air duct, 105-first guide plate, 106-rotating shaft, 107-actuator, 108-eccentric weight, 109-uniform material plate, 110-first discharge port, 111-dust falling chamber, 112-impurity discharging auger, 113-impurity discharge port, 114-connecting rod, 115-auger motor, 200-frame, 300-lifting mechanism, 301-long hole fixing plate, 302-adjusting plate, 303-adjusting bolt, 304-pivot, 305-rotating wheel, 306-strengthening support frame, 307-clamping bolt, 309-steel wire rope, 310-hanging seat, 311-connecting plate, 400-sieve body, 410-primary cleaning sieve layer, 420-cleaning sieve layer, 421-sieve plate, 422-carriage, 423-bottom plate, 424-sharp part, 425-flow guide structure, 426-lengthwise board rib, 427-cleaning ball, 430-inspection sieve layer, 440-small impurity cleaning section, 450-large impurity cleaning section, 500-frame leg, 600-external collection channel, 610-small impurity collection channel, 620-ultra-large impurity collection channel, 630-clean grain collection channel, 640-large impurity collection channel, 700-transmission module, 710-modular transmission box, 711-front fixed plate, 712-rear fixed plate, 713-fixing frame, 714-sliding wheel, 715-repair and replacement opening, 716-flap, 717-transmission shaft, 720-module frame, 721-guide rail, 730-motor, 740-clamping device, 741-fixing support, 742-sliding block, 743-placing rack, 744-clamping block, 745-screw positioning block, 746-clamping screw, 747-limiting screw, 800-equal division uniform material device, 810-upper part material assembly, 811-second guide plate, 812-secondary material distribution plate, 813-material distribution partition, 820-lower part uniform material assembly, 821-middle partition, 822-channel partition, 823-material channel, 824-second discharge port, 825-discharge plate, 830-outer shell, 900-elastic limiting device, 901-limiting shell, 902-limiting spring, 903-inner spring fixing plate, 910-limiter, 920-mounting rack, 940-extended rod. DETAILED DESCRIPTION

[0053] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the description, obviously, the drawings in the following description are only some embodiments of the present application, and other embodiments can also be obtained by those skilled in the art without any creative effort on the basis of these drawings. In order to facilitate the understanding of the present application, the present application will be described in more detail in combination with the drawings and specific embodiments.

[0054] The application is a kind of intelligent large-scale symmetrical screening and impurity removal equipment, as shown in the drawings, comprising a winnowing system 100, a rack 200, a lifting mechanism 300, a screen body 400, a rack leg 500, an external collection channel 600 and a transmission module 700. Figure 1 The winnowing system 100 is arranged above the rack 200, and the material passing through the winnowing system 100 enters the screen body 400; the lifting mechanism 300 suspends the screen body 400 below the rack 200; the middle part of the screen body 400 is provided with an equal material distribution device 800 for distributing the material to both sides for symmetrical screening; the two sides of the screen body 400 are provided with external collection channels 600 for guiding the impurities and pure materials screened by the screen body 400 to be discharged respectively; the rack 200 is supported by the rack legs 500 connected thereto; and the transmission module 700 is arranged in the screen body 400 for driving the screen body 400 to make rotary motion.

[0055] As shown in Figure 2 and Figure 3 , the winnowing system 100 comprises a feed inlet 101, a self-circulating fan 102, a soundproof chamber 103, a return air duct 104, a first material guide plate 105, a dust falling chamber 111, a first discharge outlet 110, an eccentric transmission material uniformizing mechanism and an impurity removal assembly, wherein the self-circulating fan 102, the soundproof chamber 103, the return air duct 104 and the dust falling chamber 111 are sequentially and sealingly communicated to form an internal circulation air path completely independent of the outside, without the need for additional external air net, which not only simplifies the installation process of the equipment and reduces the site occupation cost, but also reduces the energy loss of the air path, meeting the energy saving and environmental protection requirements. The feed inlet 101 is arranged at the feed end of the top of the device, and the first material guide plate 105 is fixedly inclined below the feed inlet 101, which can stably receive and guide the input material, avoiding the accumulation caused by the direct impact of the material on the subsequent assembly; the first discharge outlet 110 is arranged at the discharge end of the bottom of the device, the air outlet of the return air duct 104 extends to the area above the first discharge outlet 110, and the tail end is sealingly connected to the top air inlet of the dust falling chamber 111, so that the circulating air can flow through the first discharge outlet 110 area after completing the winnowing, and accurately enter the dust falling chamber 111 for impurity settlement, and the whole air path closed loop design effectively avoids dust overflow, improving the environmental protection of the working environment.

[0056] The circulating air path assembly is the core of realizing low noise and negative pressure winnowing. The self-circulating fan 102 is a low-noise centrifugal fan fixed in the middle of the device. Its air inlet is in sealed communication with the air outlet of the dust falling chamber 111, and the air outlet is seamlessly connected to the air inlet of the soundproof chamber 103. The self-circulating fan 102 can provide stable negative pressure suction power for the internal air path, so that a continuous negative pressure environment is formed in the device, and the problem of dust overflow is eliminated from the root. The soundproof chamber 103 is a closed cavity structure, which is sleeved outside the air outlet of the self-circulating fan 102. The inner wall of the cavity is paved with porous sound-absorbing materials such as polyester fiber sound-absorbing cotton and rock wool. The airflow discharged by the self-circulating fan 102 first enters the soundproof chamber 103, and after the airflow fully contacts the sound-absorbing materials, the noise pollution problem during the operation of the equipment can be greatly improved. The air return duct 104 is a closed metal duct structure welded as a whole, without any external air pipe interface. One end is in sealed connection with the air outlet of the soundproof chamber 103, and the other end extends above the first discharge port 110 and is in communication with the top of the dust falling chamber 111. This closed design ensures that the airflow only circulates within the device, avoiding energy loss caused by external air nets and preventing dust dispersion caused by air leakage, further improving the energy saving and environmental protection performance of the equipment. The dust falling chamber 111 is designed as an inverted conical cavity structure and is arranged in the middle of the device. By means of the principle of gravity settling, the dust and light impurities in the circulating airflow are efficiently separated, providing protection for the clean operation of the circulating air path.

[0057] The eccentric transmission uniform material mechanism is fixed in the device below the first guide plate 105 and above the first discharge port 110, and is composed of a rotating shaft 106, an actuator 107, a connecting rod 114, an eccentric weight 108 and a uniform material plate 109, and is a key structure for improving the screening accuracy. The rotating shaft 106 is horizontally arranged on the side wall of the device and is rotatably connected to the device through bearings at both ends, and one end extends to the outside of the device and is drivingly connected to the output end of the actuator 107; the actuator 107 can be selected according to the on-site gas source or power supply conditions, and is fixed on the outside of the device, and the output shaft is rigidly connected to the rotating shaft 106 and can drive the rotating shaft 106 to reciprocating rotate, thereby driving the connecting rod 114 to linearly displace, and the other end of the connecting rod 114 is hingedly connected to the upper surface of the uniform material plate 109, so as to finally realize the accurate adjustment of the opening angle of the uniform material plate 109 above the first discharge port 110. A sensor is arranged below the actuator 107, which can flexibly adjust the material flow rate according to the particle size and flow rate of the material, so as to ensure that the material uniformly slides to the first discharge port 110. The eccentric weight 108 is fixed to the other end of the rotating shaft 106, and the center of gravity is eccentric to the axis of the rotating shaft 106. When the rotating shaft 106 rotates, the eccentric weight 108 also rotates to the same side, and the opening and closing of the uniform material plate 109 is adjusted by the weight, so as to further improve the uniformity of the material distribution, and the screening accuracy is greatly improved in cooperation with the air separation effect. The impurity removal assembly is arranged at the bottom of the dust falling chamber 111 and includes a impurity removal auger 112, an impurity discharge port 113 and an auger motor 115, and can realize efficient collection and discharge of impurities. The impurity removal auger 112 is horizontally embedded at the bottom of the dust falling chamber 111 and can push the settled dust and impurities comprehensively, avoiding impurity residues; the auger motor 115 is fixed on one side of the impurity removal auger 112 and drives the rotation of the impurity removal auger 112 through a belt, thereby providing stable power for impurity conveying; and the impurity discharge port 113 is arranged on the outside of the screening device and is aligned with the discharge end of the impurity removal auger 112. After the impurities are uniformly pushed by the impurity removal auger 112, they are discharged from the impurity discharge port 113, and a collecting device can be connected to realize unified treatment of the impurities, so as to ensure the purity of the material after screening and avoid the influence of impurity accumulation on the operation efficiency of the device.

[0058] The working principle of the winnowing system is as follows: the materials to be screened, such as grain, chemical particles and feed raw materials, are fed from the top feeding port 101, slide along the inclined first guide plate 105 to the material uniformizing plate 109; the actuator 107 is started to drive the rotating shaft 106 to reciprocate, and the material uniformizing plate 109 is adjusted to a preset opening and closing angle according to the sensor data, so that the materials slide to the first discharge port 110 at a uniform flow rate; the self-circulating fan 102 is started, the airflow enters the soundproof chamber 103 to reduce noise, and then is transported to the upper side of the first discharge port 110 through the closed return air duct 104, and the airflow passes through the falling material layer from top to bottom to complete the winnowing screening, and separates dust, shriveled grains, broken slag and other light impurities from the materials; after the airflow carrying impurities enters the dust falling chamber 111, the flow rate is reduced, the light impurities settle to the bottom of the discharge auger 112 under the action of gravity, the purified airflow is extracted by the self-circulating fan 102 again to complete the internal circulation; the discharge auger 112 is driven to rotate by starting the auger motor 115, and the settled impurities are pushed out of the discharge port 113, and the qualified materials after the winnowing screening are discharged from the first discharge port 110 to complete the winnowing screening work.

[0059] The materials after the winnowing enter the screen body 400, as shown in Figure 4 The first enters the primary cleaning screen layer 410 arranged above the uniform material distribution device 800, which serves as the first screening checkpoint and can effectively intercept and remove oversized impurities in the materials to avoid blocking or unbalanced load on the subsequent screening structure.

[0060] The materials treated by the primary cleaning screen layer 410 immediately enter the uniform material distribution device 800, as shown in Figures 5 to 7 The width-dividing distribution plate 813 first divides the materials in the width direction in the upper material distribution assembly 810; the second guide plate 811 arranged in the opposite direction and staggered in the adjacent distribution plate 813, together with the secondary distribution plate 812 on the material path below the second guide plate 811, fully divides and distributes the entering materials, so that the materials have good uniformity before entering the lower uniform material distribution assembly. The intersection line of the staggered second guide plate 811 is arranged with a partition plate 821 below, which divides the lower uniform material distribution assembly 820 into two independent areas. Each independent area has a corresponding channel partition plate 822 in the distribution plate 813, and the adjacent channel partition plates 822 form a plurality of material channels 823. The outer shell 830 of the material channel 823 is provided with a second discharge port 824 corresponding to the screen grid assembly of the cleaning screen layer 420, and the uniform materials in the material channel 823 are precisely guided out of the second discharge port 824 by the discharge plate 825, so as to realize the uniform distribution of the materials to the two cleaning screen layers 420, ensure that the screening loads of the two cleaning screen layers 420 are completely consistent, greatly improve the uniformity and efficiency of the overall screening, and avoid the problem of reduced screening accuracy caused by unbalanced load of the materials.

[0061] AsFigure 8 and Figure 9 As shown, the cleaning screen layer 420 is symmetrically arranged on both sides of the material distribution and equalization device 800, and consists of two or more stacked screen grid assemblies. Each screen grid assembly includes a screen plate 421, a bracket 422, and a bottom plate 423 arranged sequentially from top to bottom. The screen plate 421 is divided into a small impurity cleaning section 440 and a large impurity cleaning section 450 along the material flow direction. The small impurity cleaning section 440 is equipped with small holes to accurately remove small impurities, while the large impurity cleaning section 450 is equipped with large holes to allow clean grain to fall and efficiently remove large impurities. This segmented aperture design achieves accurate cleaning of impurities of different sizes. The bracket 422 is a grooved mesh punch structure arranged at intervals, used to place rubber cleaning balls 427. The cleaning balls 427 can continuously clean the screen plate 421 during the screening process, effectively preventing screen hole blockage and ensuring the continuity of screening operation. The bottom plate 423... 23 is an inverted V-shape, with its tip 424 positioned in the middle of the base plate 423 along the material flow direction. The base plate 423 on both sides of the tip 424 is provided with a flow guiding structure 425, which can guide impurities to be quickly separated and flow to the external collection channel 600. The base plate 423 is also provided with a continuous strip rib 426 perpendicular to the tip 424, dividing the base plate into two sections corresponding to the small impurity cleaning section 440 and the large impurity cleaning section 450. This not only enhances the structural strength of the base plate 423, but also adapts to the segmented design of the sieve plate 421, further improving the accuracy of impurity cleaning and the durability of the sieve assembly.

[0062] like Figure 10 As shown, the external collection channel 600 includes a small impurity collection channel 610, an oversized impurity collection channel 620, a clean grain collection channel 630, and a large impurity collection channel 640. The oversized impurity collection channel 620 collects and guides the oversized impurities screened out in the primary cleaning screen layer 410. The guide structure 425 corresponding to the small impurity cleaning section 440 guides the small impurities to the small impurity collection channel 610, and the guide structure 425 corresponding to the large impurity cleaning section 450 guides the clean grain to the clean grain collection channel 630. Figure 11 As shown, the small miscellaneous collection channel 610 and the large miscellaneous collection channel 620 partially overlap and are arranged in parallel.

[0063] Finally, the material processed by the cleaning screen layer 420 enters the inspection screen layer 430 located below it. As the final checkpoint in the screening process, the inspection screen layer 430 effectively removes large impurities that were not completely removed by the previous screen layers, further ensuring the purity of the material and improving the overall screening accuracy in a stepwise manner. The large impurity collection channel 640 is located on the side of the bottom of the inspection screen layer 430 and is used to collect large impurities discharged from the inspection screen layer 430.

[0064] Each of the above collection channels has two or more channels, which enables the classified collection of different types of impurities and materials, facilitating subsequent impurity treatment and material recycling, and greatly improving separation efficiency and resource utilization.

[0065] As shown in Figure 12 and Figure 13 , the hoisting mechanism 300 includes four independently arranged fine-tuning hoisting mechanism bodies, corresponding to the four corners of the rotary screening equipment respectively, each body structure is consistent, and is installed at the corresponding position of the rack 200 above the rotary screening equipment, and the stable hoisting and precise adjustment of the rotary screening equipment are realized through the cooperative action.

[0066] The core load-bearing component of each fine-tuning hoisting mechanism body is a reinforced support frame 306, which has high-strength mechanical properties and can withstand the self-weight and vibration load of the rotary screening equipment during operation. The upper part of the reinforced support frame 306 is provided with an adjusting plate 302, which is parallelly attached to a long-hole fixed plate 301 fixed on a support beam 308. The surface of the long-hole fixed plate 301 is provided with a vertical long hole, which is vertically connected with the support beam 308. The adjusting plate 302 is provided with a threaded hole at the corresponding position, and at least one set of clamping bolts 307 is threadedly connected with the adjusting plate 302 after passing through the long hole of the long-hole fixed plate 301, and is locked and fixed by nuts. When it is necessary to adjust the height of the corresponding corner of the rotary screening equipment, only the nuts of all the clamping bolts 307 need to be loosened, and the nuts of the adjusting bolts 303 are loosened or tightened to pull up or lower the fine-tuning hoisting mechanism body, and after being in place, all the fastening nuts are locked to complete the fixing. This structure eliminates the punching and calibration steps of the traditional rigid hoisting, directly realizes the vertical quick adjustment through the cooperation of the long hole and the bolt, shortens the height adjustment time of a single corner to within 3 minutes, significantly improves the efficiency of the screen surface level calibration, and ensures the balance and stability of the transmission flyweight during operation. At the same time, the bottom of the reinforced support frame 306 is rotatably installed with a rotating wheel 305 through a pin shaft 304, a steel wire rope 309 is wound on the rotating wheel 305, and the end of the steel wire rope 309 is connected with a hanging seat 310, which is directly hung on the hoisting point of the rotary screening equipment, forming a complete force transmission path. The flexible steel wire rope 309 can also buffer the vibration of the rotary screening equipment, avoiding stress concentration of rigid connection.

[0067] In order to enhance the stability of the connection between the adjusting plate 302 and the long-hole fixed plate 301, the clamping bolts 307 are preferably arranged in two groups, which are located at the upper and lower parts of the long-hole fixed plate 301 and the adjusting plate 302 respectively. The two groups of bolts are symmetrically distributed, and can form two-point fixation after adjustment, avoiding the inclination or loosening of the adjusting plate 302 during the vibration of the rotary screening equipment, ensuring the position accuracy after height adjustment, further ensuring the stability of the screen surface transverse level, and reducing the wear of the transmission components caused by loose connection.

[0068] In view of the size and load-bearing requirements of different rotary screening devices, the adjusting plate 302 and the long-hole fixing plate 301 can be provided with at least two groups or more groups, and a connecting plate 311 is welded between the two adjacent long-hole fixing plates 301. The cooperation of multiple groups of adjusting plates and long-hole fixing plates can disperse the lifting load and avoid excessive stress on a single connection point; and the connecting plate 311 can connect the adjacent long-hole fixing plates 301 as a whole, enhance the lateral rigidity of the support structure, prevent the long-hole fixing plate 301 from lateral deformation under load, and improve the overall load-bearing capacity of the mechanism.

[0069] The reinforcing support frame 306 is also provided with a tension adjusting bolt 303, which passes through the corresponding through hole of the connecting plate 311 and the reinforcing support frame 306 in the vertical direction, and is locked by a nut at one end. When fine adjustment of the relative position between the long-hole fixing plate 301 and the adjusting plate 302 is needed, the clamping bolt 307 should be loosened first, and then the nut on the upper end of the tension adjusting bolt 303 is tightened or loosened: when tightened, the distance between the connecting plate 311 and the reinforcing support frame 306 is reduced, driving the adjusting plate 302 to move upward relative to the long-hole fixing plate 301; when loosened, the distance between the connecting plate 311 and the reinforcing support frame 306 is increased, driving the adjusting plate 302 to move downward relative to the long-hole fixing plate 301; this design supplements the accuracy of vertical adjustment, making the relative position adjustment more flexible, especially suitable for correcting the slight deviation caused by vibration after the installation of the rotary screening device, and ensuring the stability of the levelness during long-term use.

[0070] The rotating wheel 305 is a groove wheel, and the groove arc is matched with the diameter of the steel wire rope 309, and the steel wire rope 309 is embedded in the groove. The groove structure can effectively limit the lateral displacement of the steel wire rope 309, avoid the steel wire rope from falling off during lifting, and at the same time can reduce the friction loss with the steel wire rope 309, prolong the service life of the two.

[0071] The steel wire rope 309 is preferably a galvanized steel wire rope or a stainless steel wire rope, and the galvanized layer or stainless steel material can improve its anti-corrosion ability, adapt to the common humid or dusty environment of the screening device; at the same time, such steel wire rope has high flexibility and breaking strength, which can not only meet the buffering requirements of flexible lifting, but also can ensure the safety of load-bearing, and reduce the risk of equipment accidents caused by the breaking of the steel wire rope.

[0072] In actual use, first, according to the size of the rotary screening device, a corresponding number of long-hole fixed plates 301 are fixed on the rack 200, and adjacent long-hole fixed plates 301 are connected through connecting plates 311; then the adjusting plate 302 of the reinforcing support frame 306 is preliminarily fixed with the long-hole fixed plate 301 through clamping bolts 307, the steel wire rope 309 is hung on the hanging seat 310 and connected with the rotary screening device; then the levelness of the screen surface is detected by using a level meter, the vertical height is coarsely adjusted by adjusting the clamping bolts 307 at the corresponding angle, and the relative position is finely adjusted by tightening the adjusting bolts 303 until the screen surface is transversely horizontal; finally, all the bolts are locked, and the installation is completed.

[0073] As shown in Figures 14 to 16 The lower part of the screen body 400 is provided with an elastic limiting device 900 to prevent the screen body 400 from colliding with the rack legs 500 before starting and after shutting down. The elastic limiting device 900 includes a limiter 910, a mounting frame 920 and an extension rod 940. The mounting frame 920 adopts a long strip-shaped frame structure and is arranged between the two rack legs 500, which has good structural strength and provides a mounting base for the entire device. The limiter 910, as a core component, includes a shell 901, a plurality of limiting springs 902 arranged in a ring shape between the shell 901 and an inner spring fixed plate 903, the inner spring fixed plate 903 for positioning the inner side of the spring and forming a ring-shaped space in the center, a ring-shaped extension rod baffle 904 concentrically arranged inside the inner spring fixed plate 903, and the extension rod 940 vertically inserted into the ring-shaped space of the inner spring fixed plate 913 and axially coincident with it.

[0074] During assembly, the limiter 910 is mounted at a predetermined position of the mounting frame 920, the screen body 400 is arranged above the mounting frame 920, the top of the extension rod 940 is connected to the bottom of the screen body 400, the bottom of the extension rod 940 is arranged at the center of the extension rod baffle 904, and the end of the mounting frame 920 is connected and fixed with the rack leg 500. Finally, the screen body 400 forms a multi-directional limiting structure with the mounting frame 920 through the rack legs 500.

[0075] When the screen body 400 starts or shuts down and generates an inertial motion trend, it will push the extension rod 940 to move inside the limiter 910, extrude the inner spring fixed plate 903 and make the ring-shaped uniformly arranged limiting springs 902 elastically deform, thereby absorbing the impact force and converting the rigid collision into elastic buffering, which fundamentally avoids the direct collision between the screen body 400 and the rack legs 500. The extension rod baffle 904 limits the excessive displacement of the extension rod 940 to ensure the reliability of the limiting function. The ring-shaped uniformly arranged limiting springs 902 uniformly disperse the impact force, avoid local stress concentration and prolong the service life of the device components. The long strip-shaped frame structure of the mounting frame 920 and the multi-directional limiting structure formed by the four rack legs 500 make the screen body 400 run more stably, ensure the continuity of cleaning operation and improve the operation efficiency.

[0076] As shown in Figures 17 to 19 The transmission module 700 includes a module frame 720 and a modular transmission box 710 arranged on the module frame 720. The fixed frame 713 of the modular transmission box 710 is provided with a front fixed plate 711 and a rear fixed plate 712, and the two sides of the fixed frame 713 are provided with sliding wheels 714. The module frame 720 is correspondingly provided with guide rails 721. Through the cooperation of the sliding wheels 714 and the guide rails 721, the modular transmission box 710 can be smoothly pulled out from the module frame 720, realizing the effect of maintaining the transmission components without disassembling the screen body, and greatly improving the operation and maintenance efficiency. The fixed frame 713 is provided with a maintenance and replacement opening 715, and a transmission shaft 717 is arranged in the middle. The transmission shaft 717 is provided with a flyweight 716. These components are integrated in the modular transmission box 710 to form an independent transmission module, which is convenient for overall maintenance and replacement.

[0077] The front fixed plate 711 is provided with a motor 730. The motor 730 drives the flyweight 716 to rotate along the transmission shaft 717 through a belt. This transmission mode not only has a simple structure, but also only needs to disconnect the belt connection to maintain the motor or transmission components during maintenance, thereby improving the maintenance convenience of the power transmission system.

[0078] The front fixed plate 711 is also provided with a maintenance and replacement opening 715. This design allows maintenance personnel to perform maintenance operations on the transmission components from multiple directions, such as checking and maintaining the belt connection part of the motor and the transmission shaft, thereby increasing the comprehensiveness and convenience of maintenance and avoiding the problem of operation dead angle caused by single maintenance direction.

[0079] The sliding wheels 714 are at least two on one side and symmetrically arranged on both sides of the fixed frame 713. This symmetrical layout makes the modular transmission box 710 slide along the guide rails 721 evenly, and the sliding process is stable and smooth, which not only ensures the smoothness of the maintenance operation, but also enhances the structural stability of the modular transmission box 710 during work, so that it can better bear the weight and vibration load of the transmission box, prolonging the service life of the components.

[0080] The maintenance and replacement opening 715 is provided with two or more, which are respectively located on the upper and lower surfaces of the fixed frame 713. The distribution of multiple maintenance openings allows maintenance personnel to select the operation entrance according to different maintenance needs, such as maintaining the bearing on the upper part of the transmission shaft and the transmission components on the lower part from different maintenance openings, thereby improving the flexibility and efficiency of maintenance and completely solving the problem of limited operation caused by single maintenance opening.

[0081] As shown in Figure 20 and Figure 21As shown, a clamping device 740 is arranged below the guide rail 721 for clamping the modular transmission box 710 to prevent displacement of the modular transmission box 710 during work due to vibration and other factors, further improving the overall stability of the structure and the transmission reliability. The clamping device 740 includes a fixed support 741, a sliding block 742, a placement rack 743, a clamping block 744, a screw positioning block 745, and a clamping screw 746. The fixed support 741 connects the guide rail 721 and the placement rack 743. The placement rack 743 is open on the module side and has a sliding block 742 and a clamping block 744 inside. The contact surfaces of the sliding block 742 and the clamping block 744 are inclined. The clamping screw 746 passes through the front fixed plate 711 and is in transmission cooperation with the sliding block 742, so that when the clamping screw 746 rotates, it can drive the sliding block 742 to move relative to the clamping screw 746. Limiting screws 747 are arranged on the placement rack 743. The limiting screws 747 limit the sliding stroke of the sliding block 742 and the clamping block 744. After the clamping screw 746 rotates, the sliding block 742 drives the clamping block 744 to move to the module side, thereby achieving clamping of the fixed frame 713. In addition, the front fixed plate 711 is provided with a screw positioning block 745, which can prevent the sliding block 742 from being pushed in by the clamping screw 746, ensuring that the clamping of the modular transmission box 710 can be relaxed and easily pulled out. This clamping device 740 achieves clamping through inclined surface transmission, has a compact structure and stable clamping force, effectively avoids loosening of the modular transmission box 710 during work, and ensures the reliability of the transmission. At the same time, during maintenance, the modular transmission box 710 can be pulled out by loosening the clamping screw 746, without affecting the characteristics of rapid maintenance, achieving a perfect balance between stable clamping during work and convenient operation during maintenance.

[0082] During actual maintenance, the operator can first loosen the clamping screw 746 to release the clamping device 740, then pull the modular transmission box 710 to make it slide out of the module rack 720 along the guide rail 721 through the sliding wheel 714, and then check, maintain or replace the transmission shaft 717, the flapper 716 and the belt through the multiple maintenance and replacement openings 715 on the fixed frame 713 and the front fixed plate 711. The entire process does not need to disassemble the screen body, is simple and efficient to operate, fully embodies the advantages of modular maintenance of the structure, effectively reduces the maintenance cost, and reduces the equipment downtime.

[0083] The various embodiments described in this specification are intended to be illustrative of the invention and do not limit the scope of the invention. Although specific embodiments have been described herein, they are not to be taken as the only embodiments of the invention. Various modifications can be made to the embodiments described and other embodiments can be used without departing from the spirit or scope of the invention. Accordingly, the scope of the invention is to be limited only by the claims.

Claims

1. A smart, high-capacity symmetrical screening and impurity removal device, characterized in that, Includes an air separation system (100) and a sieve body (400); The air separation system (100) is located above the frame (200), and the material passing through the air separation system (100) enters the screen body (400); The screen body (400) is suspended below the frame (200) by a hoisting mechanism (300); The screen body (400) is provided with a material distribution and equalization device (800) in the middle, which is used to divide the material into two symmetrical screening sides; The screen body (400) is provided with external collection channels (600) on both sides for exporting the impurities and pure materials screened out by the screen body (400) respectively; The frame (200) is supported by frame legs (500) connected thereto; The sieve body (400) is provided with a transmission module (700) for driving the sieve body (400) to rotate. An elastic limiting device (900) is provided below the screen body (400) to prevent the screen body (400) from colliding with the frame support legs (500).

2. The intelligent high-capacity symmetrical screening and impurity removal equipment according to claim 1, characterized in that, The air separation system (100) includes a feed inlet (101), a self-circulating fan (102), a silencing chamber (103), a return air duct (104), a first guide plate (105), a dust settling chamber (111), and a first discharge port (110). The self-circulating fan (102), the silencing chamber (103), the return air duct (104), and the dust settling chamber (111) are connected in sequence to form a circulating air path inside the screening device. The feed inlet (101) is located at the top of the equipment, the first guide plate (105) is located below the feed inlet (101), and the first discharge port (110) is located at the bottom of the screening device, so that the return air duct (104) passes through the first discharge port (110) and connects to the top of the dust settling chamber (111).

3. The intelligent high-capacity symmetrical screening and impurity removal equipment according to claim 1, characterized in that, The screen body (400) includes a primary cleaning screen layer (410), a cleaning screen layer (420), an inspection screen layer (430), and a material distribution and equalization device (800). The primary cleaning screen layer (410) is positioned above the cleaning screen layer (420) and is used to remove oversized impurities; The cleaning screen layer (420) is arranged above the inspection screen layer (430) and includes a small impurity cleaning section (440) and a large impurity cleaning section (450). The small impurity cleaning section (440) is used to remove small impurities, and the large impurity cleaning section (450) is used to remove large impurities. The inspection sieve layer (430) is used to screen out grains that were not cleaned from the impurities in the previous sieve layer; The material distribution and equalization device (800) is located below the primary cleaning screen layer (410) and is used for the centralized flow of materials between the cleaning screen layers (420).

4. The intelligent high-capacity symmetrical screening and impurity removal equipment according to claim 1, characterized in that, The material distribution and leveling device (800) includes a housing (830) and an upper material distribution assembly (810) and a lower material distribution assembly (820) inside it; the upper material distribution assembly (810) includes a material distribution partition (813) with an evenly divided width, and adjacent material distribution partitions (813) are provided with opposing inclined second material guide plates (811) arranged alternately; a middle partition (821) is provided at the lower part of the second material guide plate (811) to divide the lower material distribution assembly (820) into two independent areas. Each independent area has a channel partition (822) in the lower part of the material equalization component (820) that corresponds to the material distribution partition (813). Adjacent channel partitions (822) form multiple material channels (823). The outer shell (830) of the material channel (823) has a second discharge port (824) corresponding to the sieve assembly. The discharge plate (825) discharges the evenly distributed material in the material channel (823) out of the second discharge port (824) to achieve even distribution of the material on both sides.

5. The intelligent high-capacity symmetrical screening and impurity removal equipment according to claim 1, characterized in that, The transmission module (700) includes a module frame (720) and a modular transmission box (710) disposed on the module frame (720). The modular transmission box (710) includes a fixed frame (713), a front fixed plate (711) and a rear fixed plate (712) on the fixed frame (713), sliding wheels (714) on both sides of the fixed frame (713), an inspection and replacement port (715) on the fixed frame (713), a transmission shaft (717) in the middle of the fixed frame (713), and a swing block (716) on the transmission shaft (717). The modular frame (720) is provided with a guide rail (721), and the modular transmission box (710) can be pulled out from the modular frame (720) by means of the sliding wheel (714) and the guide rail (721).

6. The intelligent high-capacity symmetrical screening and impurity removal equipment according to claim 1, characterized in that, The hoisting mechanism (300) includes a reinforced support frame (306), on which an adjustment plate (302) is provided. The adjustment plate (302) is connected to the elongated hole fixing plate (301) on the frame (200) by at least one set of clamping bolts (307) to achieve vertical position adjustment between the two. A rotating wheel (305) is installed at the bottom of the reinforced support frame (306) through a pin (304). A steel wire rope (309) is wound on the rotating wheel (305), and the end of the steel wire rope (309) is connected to a hanging seat (310).

7. The intelligent high-capacity symmetrical screening and impurity removal equipment according to claim 3, characterized in that, The cleaning screen layer (420) consists of two or more stacked screen assemblies, the screen assemblies including: The sieve plate (421) is divided into a small impurity cleaning section (440) and a large impurity cleaning section (450) along the material flow direction. The small impurity cleaning section (440) is provided with small holes, and the large impurity cleaning section (450) is provided with large holes. The bottom plate (423) is located below the screen plate (421). The bottom plate (423) is inverted V-shaped, and its tip (424) is located in the middle of the bottom plate (423) along the material flow direction. The bottom plate (423) is provided with a continuous strip rib perpendicular to the tip (424) to divide the bottom plate (423) into two sections corresponding to the small impurity cleaning section (440) and the large impurity cleaning section (450).

8. The intelligent high-capacity symmetrical screening and impurity removal equipment according to claim 7, characterized in that, The base plate (423) is provided with a flow guiding structure (425), which is disposed on both sides of the tip (424).

9. The intelligent high-capacity symmetrical screening and impurity removal equipment according to claim 1, characterized in that, An elastic limiting device (900) is provided below the screen body (400). The elastic limiting device (900) includes a mounting frame (920) and a limiter (910) provided on the mounting frame (920). The limiter (910) includes a limiting shell (901), a limiting spring (902), and an inner spring fixing plate (903). The limiting spring (902) is located between the limiting shell (901) and the inner spring fixing plate (903). An extension rod (940) is inserted into the annular space formed by the inner spring fixing plate (903).

10. A smart, high-volume symmetrical screening and impurity removal method, characterized in that, Includes the following steps: Step 1, air separation and impurity removal: The material to be screened is fed into the inlet (101) of the air separation system (100), guided by the first guide plate (105) to the uniform plate (109) of the eccentric transmission uniform material mechanism. The actuator (107) drives the rotating shaft (106) to rotate back and forth. The opening and closing angle of the uniform plate (109) is adjusted by the eccentric counterweight (108) so that the material slides towards the first outlet (110) at a uniform flow rate. At the same time, the self-circulating fan (102) is started. The airflow is reduced by noise reduction in the silencing chamber (103) and transported to the top of the first outlet (110) through the return air duct (104). It passes through the material layer from top to bottom to separate light impurities. The airflow carrying impurities enters the dust settling chamber (111) to settle. The settled impurities are pushed to the impurity outlet (113) by the impurity discharge auger (112) and discharged. The material separated by air enters the screen body (400) from the first outlet (110). Step 2, initial cleaning and screening: The material first enters the initial cleaning screen layer (410) of the screen body (400) to intercept and remove oversized impurities in the material. The oversized impurities are discharged through the oversized impurity collection channel (620). Step 3, equal distribution and flow guidance: The pre-cleaned material enters the equal distribution and flow equalization device (800). First, the material is initially divided by the material distribution partition (813) and the second guide plate (811) of the upper material distribution component (810). Then, the material is guided by the material channel (823) formed by the channel partition (822) in the lower material equalization component (820) separated by the middle partition (821). The material is then evenly distributed from the second discharge port (824) to the cleaning screen layer (420) on both sides of the screen body (400) by the discharge plate (825). Step 4, graded impurity removal: After the material enters the cleaning screen layer (420), it first passes through the small hole screen plate of the small impurity cleaning section (440) to remove small impurities. The small impurities are discharged through the small impurity collection channel (610) and then pass through the large hole screen plate of the large impurity cleaning section (450) to separate large impurities. The clean grain enters the clean grain collection channel (630) through the bottom plate (423) guide structure (425). The large impurities fall through the cleaning screen layer (420) to the inspection screen layer (430). Step 5, re-inspection and screening: The material from the cleaned screen layer (420) enters the inspection screen layer (430) to screen out the clean grains that were not screened in the previous step. Large impurities are discharged through the large impurity collection channel (640) to complete the full process of material screening and impurity removal.

Images