A drum screen grading and powder selection device and its grading system

Abstract

The application provides a drum screen grading and powder selecting device and a grading system. The drum screen comprises a base, a supporting device and a cylinder. The cylinder comprises a drum screen mesh and a mesh support. A first cavity is enclosed in the drum screen mesh. A drum screen sealing cover is arranged on the periphery of the cylinder. A second cavity is arranged between the drum screen mesh and the drum screen sealing cover. A first discharge port is arranged below the second cavity. A first air inlet is arranged on one side of the drum screen sealing cover of the ascending section of the material in the cylinder. The first air inlet is connected with an air inlet device. A third cavity is arranged on the outer side of the drum screen sealing cover on the opposite side of the first air inlet. A second discharge port is arranged at the lower end of the third cavity. A stone powder screen is arranged between the third cavity and the second cavity. The application solves the problems of the existing drum screen and dust collector, such as no powder selecting function, uncontrollable stone powder content, high cost, complex structure, unstable product grading and quality of the existing machine-made sand and stone grading system.

Description

Technical Field

[0001] This invention relates to the field of drum screen technology, specifically to a drum screen grading and powder selection device and its grading system. Background Technology

[0002] Currently, there are three types of powder selection and grading devices for manufactured sand and gravel production on the market:

[0003] 1. Air sieve-based powder classification and grading systems, consisting of a feeder, air sieve, filtration and recovery system, and dust collector, are simple in structure and low in manufacturing cost. However, their grading effect is greatly affected by the moisture content of the material. They are very effective with very dry materials, but their efficiency drops sharply as the moisture content of the raw material increases. Furthermore, their efficiency fluctuates with changes in the humidity of the material and the environment, resulting in unstable product quality. Additionally, the selected fine powder often contains excessively large particles, which is difficult to control, and the product range is relatively limited, generally offering only one type of finished material.

[0004] 2. Systems composed of dynamic classifiers, V-shaped classifiers, and vibrating screens are relatively accurate and thorough in classifying and screening powders. However, these systems are overly complex, occupy a large space, experience significant vibration, and have high manufacturing and operating costs and power consumption.

[0005] 3. Systems consisting of rotary drum screens and dust collectors are low-cost, energy-saving, and environmentally friendly, and do not clog the screen. However, the products are relatively limited, occupy a large area, lack powder sorting capabilities, and the stone powder content cannot be controlled.

[0006] Based on the above situation, the present invention aims to provide a drum screen grading and powder selection device that has both grading and powder selection functions, as well as a sand and gravel aggregate grading system that can make the production system of manufactured sand and gravel more cost-effective, more energy-efficient and environmentally friendly, with more types of finished materials, richer and more accurate product gradation, and more stable product quality. Summary of the Invention

[0007] This invention provides a drum screen grading and powder selection device to solve the problem that existing systems composed of drum screens and dust collectors lack powder selection functions and cannot control the stone powder content.

[0008] To address the aforementioned technical problems, this invention provides a drum screen grading and powder selection device, comprising a drum screen, which includes a base, a support device, a cylinder body, and a cylinder body driving device. The cylinder body includes a drum screen mesh and a screen mesh support.

[0009] The drum screen encloses a first cavity;

[0010] A drum screen sealing cover is provided around the cylinder body, and a second cavity is formed between the drum screen and the drum screen sealing cover;

[0011] A first discharge port is provided at the bottom of the second cavity;

[0012] A first air inlet is provided on the sealing cover of the drum screen on one side of the material rising section inside the cylinder, and the first air inlet is connected to the air inlet device.

[0013] A third cavity is provided on the outer side of the drum screen sealing cover on the opposite side of the first air inlet;

[0014] The lower end of the third cavity is provided with a second discharge port, and a stone powder screen is provided between the third cavity and the second cavity.

[0015] Preferably, the stone powder screen is connected to at least the side portion of the first cavity and / or the lower portion of the first cavity; the lower portion of the stone powder screen is connected to the lower portion of the first discharge port, so that the first discharge port is connected to the third cavity through the stone powder screen.

[0016] Preferably, the lower part of the stone powder screen is inclined towards the first discharge port, and the angle between the extension line of its cross section and the Y-axis is not less than 30 degrees and not more than 60 degrees.

[0017] Preferably, a negative pressure air inlet is provided above the third cavity, and the negative pressure air inlet is connected to a negative pressure fan or a classifier.

[0018] Preferably, a second air inlet is provided above the first discharge port of the second cavity. The second air inlet is located below the drum screen and on the same side as the first air inlet. The stone powder screen is provided on the opposite side of the second air inlet. The second air inlet is connected to the air inlet device.

[0019] Preferably, a feed inlet is provided at the end of the drum screen, and a third air inlet is provided at the end of the feed inlet, the third air inlet being connected to an air intake device.

[0020] Preferably, the rotary drum screen sealing cover includes multiple sections of rotary drum screen sealing cover arranged along the axial direction of the rotary drum screen. Each section of the rotary drum screen sealing cover seals and divides the second cavity into multiple sections. The third cavity is connected to the second cavity of the first section near the feed inlet of the rotary drum screen. The upper part of the third cavity is connected to an air classifier. The airflow discharged by the air classifier is connected to a fine powder collection device through an air separation pipe. The filtered airflow of the fine powder collection device is returned to the first air inlet through a return air pipe and flows back to the rotary drum screen to form a cycle.

[0021] Preferably, the cylinder driving device includes a driving wheel and a driving motor. The driving wheel is located on the outside of the cylinder, and the driving motor drives the driving wheel to rotate, thereby driving the cylinder to rotate.

[0022] Preferably, the inner surface of the drum screen is provided with a circumferentially evenly spaced fabric feeding device. The fabric feeding device is disposed within the drum screen corresponding to the second cavity on the side closest to the third cavity. The fabric feeding device includes a support ring assembly, an outer fixing plate, and an inner fixing plate. The inner fixing plate is connected to the fabric feeding upright plate. The support ring assembly includes an upper support ring and a lower support ring. The upper support ring and the lower support ring are sleeved on the outer ring of the drum screen and are arranged parallel and spaced apart. The outer fixing plate is disposed on the outside of the support ring assembly, and the inner fixing plate is disposed on the inside of the screen. The outer fixing plate and the inner fixing plate are fixedly connected by clamping the support ring assembly and the drum screen.

[0023] Compared with related technologies, the drum screen grading and powder selection device provided by the present invention has the following beneficial effects:

[0024] This invention provides a drum screen grading and powder selection device, enabling the drum screen to simultaneously grade and separate stone powder and fine particles while screening large particles. Specifically, it includes three chambers: a material screening chamber, an undersize discharge chamber, and a stone powder and fine particle collection and sorting area. Through ingenious design, the stone powder and fine particles dispersed by tumbling in the material screening chamber are collected and guided to the stone powder and fine particle collection and sorting area via an established air duct, achieving grading and sorting of stone powder and fine particles. During this process, further particle size separation controls the particle size range of the stone powder and fine particles, avoiding oversize issues. The air inlet parameters of the first air inlet and the mesh size of the stone powder screen are adjustable, making the content of stone powder and fine particles controllable.

[0025] This invention also achieves the function of cleaning the screen, reducing the clogging of the screen by stone powder and fine particles carried and mixed on the material.

[0026] This invention also provides a grading system that solves the problems of high cost, complex structure, and unstable product gradation and quality in existing manufactured sand and gravel grading systems.

[0027] To solve the above-mentioned technical problems, a grading system is provided, including the above-mentioned drum screen grading and powder selection device, wherein the discharge port of the drum screen grading and powder selection device is connected to the feed of a vibrating screen, and the vibrating screen is one or more layers.

[0028] Compared with related technologies, the hierarchical system provided by the present invention has the following beneficial effects:

[0029] This invention provides a grading system that, through the aforementioned drum screen and powder classifier, can be combined with a vibrating screen to form a grading and screening system. Due to the inherent structural limitations of the drum screen, when more grades of materials need to be screened, the structure becomes more complex, resulting in higher costs and lower efficiency. To address this issue, a vibrating screen is combined with the aforementioned device. The resulting integrated system leverages complementary advantages. The drum screen and powder classifier perform preliminary grading and stone powder separation simultaneously, providing the vibrating screen with a precise feed of low powder content and a narrow particle size range. This addresses the problems of open-type vibrating screens, difficulty in controlling dust and stone powder clogging the screen, as well as the issues of wide-range feeds, low surface turnover rate, and low screening efficiency. Simultaneously, the discharge from the drum screen is connected to the vibrating screen, allowing for precise fine screening of materials with low powder content and a narrow feed range using a vibrating method. This reduces the complexity and cost associated with multi-stage screening in vibrating screens, transforming the traditional drum screen (relying on rotation, lifting, and throwing with an arc-shaped contact surface) into a planar, vibrating vibrating screen. This provides a more suitable screening power source, higher screening efficiency, and finer product particle size. Furthermore, the pre-sorting and grading of stone powder and fine powders allows for a wider variety of gradations, resulting in more diverse finished products and more stable product quality. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the drum screen grading and powder selection device according to an embodiment of the present invention;

[0031] Figure 2 This is one of the cross-sectional views of the drum screen grading and powder selection device according to an embodiment of the present invention;

[0032] Figure 3 This is one of the cross-sectional schematic diagrams of the drum screen grading and powder selection device according to an embodiment of the present invention;

[0033] Figure 4 This is a front view of the drum screen grading and powder selection device according to an embodiment of the present invention;

[0034] Figure 5 This is a second cross-sectional schematic diagram of the drum screen grading and powder selection device according to an embodiment of the present invention;

[0035] Figure 6 This is the third cross-sectional schematic diagram of the drum screen grading and powder selection device according to an embodiment of the present invention;

[0036] Figure 7 This is a second cross-sectional view of the drum screen grading and powder selection device according to an embodiment of the present invention;

[0037] Figure 8 This is one of the top views of the drum screen grading and powder selection device according to an embodiment of the present invention;

[0038] Figure 9 This is a second top view of the drum screen grading and powder selection device according to an embodiment of the present invention;

[0039] Figure 10 This is a schematic diagram of the hierarchical system according to an embodiment of the present invention;

[0040] Figure 11 This is one of the side view structural schematic diagrams of the hierarchical system according to an embodiment of the present invention;

[0041] Figure 12 This is a second side view of the hierarchical system according to an embodiment of the present invention;

[0042] Numbering on the map:

[0043] 1. Rotary drum screen; 101. Base; 102. Support device; 103. Cylinder body; 104. Rotary drum screen mesh; 105. Rotary drum screen sealing cover; 106. First discharge port; 1061. Fine material discharge port; 1062. Coarse material discharge port; 107. Second discharge port; 108. Spiral blades; 109. Screen discharge port; 1010. Feed inlet; 1011. Second air vent; 1012. Discharge cover;

[0044] 2. First air inlet; 3. Fan;

[0045] 4. Stone powder screen, 401, longitudinal screen, 402, inclined screen;

[0046] 5. First air intake; 6. Second air inlet;

[0047] 7. Air classifier, 701, third discharge port;

[0048] 8. Third air inlet;

[0049] 9. Fabric feeding device; 901. Support ring assembly; 902. Outer fixing plate; 903. Inner fixing plate; 904. Fabric upright plate; 9011. Upper support ring; 9012. Lower support ring.

[0050] 10. Air separation pipeline; 11. Fine powder collection device; 12. Return air pipeline; 13. Micro powder pipeline; 14. Micro powder collection device; 15. Flip plate; 16. Dust collection device; 17. Screen vibrator.

[0051] b. Second cavity, a. First cavity, c. Third cavity;

[0052] A. Vibrating screen A, B. Vibrating screen B, C. Vibrating screen C;

[0053] D, Finished material D; E, Finished material E; F, Finished material F. Detailed Implementation

[0054] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0055] First Embodiment

[0056] Please see Figure 1 and Figure 2 As shown, this embodiment provides a drum screen grading and powder selection device, including a drum screen 1. The drum screen 1 includes a base 101, a support device 102, a cylinder 103, and a cylinder drive device 18. The cylinder 103 includes a drum screen 104 and a screen support. A spiral blade 108 is installed inside the cylinder. A first cavity a is formed inside the drum screen 104. A drum screen sealing cover 105 is provided around the cylinder 103. A second cavity is formed between the drum screen 104 and the drum screen sealing cover 105. Body b; a first discharge port 106 is provided below the second cavity b. This first discharge port 106 can be set into multiple discharge ports with different particle size ranges according to the product type requirements of the drum screen 1 and the different mesh sizes of the drum screen 104; a first air inlet 2 is provided on the drum screen sealing cover 105 on one side of the material rising section inside the cylinder 103, and the first air inlet 2 is connected to the ventilator 3; a third cavity c is provided on the outer side of the drum screen sealing cover 105 on the opposite side of the first air inlet 2.

[0057] The lower end of the third cavity c is provided with a second discharge port 107, and a stone powder screen 4 is provided between the third cavity c and the second cavity b.

[0058] Compared with related technologies, the drum screen grading and powder selection device provided in this embodiment has the following beneficial effects:

[0059] This embodiment provides a drum screen grading and powder selection device, enabling the drum screen to be used for grading and separating stone powder and fine particles simultaneously while screening large particles. Specifically, it includes three chambers: a material screening chamber, an undersize discharge chamber, and a stone powder and fine particle collection and sorting area. Through ingenious design, the stone powder and fine particles dispersed by tumbling in the material screening chamber are collected and guided to the stone powder and fine particle collection and sorting area through an established air duct, achieving grading and sorting of stone powder and fine particles. During this process, further particle size separation is used to control the particle size range of stone powder and fine particles, avoiding oversize problems. The air inlet parameters of the first air inlet 2 and the mesh size of the stone powder screen 4 are adjustable, making the content of stone powder and fine particles controllable.

[0060] Second Embodiment

[0061] Please see Figure 1 , Figure 2 and Figure 3 , 4As shown in Figure 5, based on the drum screen grading and powder selection device provided in the first embodiment of this application, the second embodiment of this application proposes another drum screen grading and powder selection device. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0062] Specifically, the difference in the second embodiment of this application regarding the drum screen grading and powder selection device lies in the fact that the drum screen 104 of the drum screen 1 can be divided into several segments along its length, each segment using different mesh sizes. Different mesh sizes in different segments can screen materials with different particle size ranges. For example, in this embodiment, the screen is set to two segments with two types of mesh sizes, and the first discharge port 106 under the screen can also be set to two, namely a fine material discharge port 1061 and a coarse material discharge port 1062. In addition, the discharge port 109 at the tail end of the screen can screen out three types of materials. With the addition of the collection and sorting categories of stone powder and fine powder, more graded products can be produced. However, it should be noted that the body of the drum screen 1 in this embodiment can also be set to have more layers of screens and more types of screens in each layer to screen out more subdivided types of materials.

[0063] On the side of the drum screen 1, in the rising section of the material, a first air inlet 2 and a matching fan 3 are provided. On the opposite side of the drum screen, a stone powder screen 4 is installed. The stone powder screen 4 includes a longitudinal screen 401 and an inclined screen 402. The lower part of the inclined screen 402 is inclined from left to right towards the first discharge port 106. The angle between the extended line of its cross section and the Y-axis is not less than 30 degrees and not more than 60 degrees. The longitudinal screen 401 and the inclined screen 402 connect the side and the lower part of the first cavity a. The lower part of the inclined screen 402 is connected to the lower part of the first discharge port 106, so that the first discharge port 106 is connected to the third cavity c through the inclined screen 402. This is beneficial for the discharge of large particles and also facilitates the further sedimentation and sorting of stone powder and fine powder during the discharge descent process, and reduces material accumulation and blockage.

[0064] The third cavity c is formed on the outer side of the longitudinal screen 401 and the inclined screen 402, and a first air inlet 5 is provided on the upper side of the third cavity c. A classifier 7 can be installed on the first air inlet 5, or it can be omitted; the first air inlet 5 can also be located on top of the drum screen 1. The classifier 7 can be a high-precision rotor classifier, or other types of classifiers, such as blade-type classifiers. Louvers, baffles, or screens can be placed at the first air inlet 5 to block some coarse particles from entering the classifier 7, thus providing preliminary air separation. The powder passes through the drum screen 104, the longitudinal screen 401, and the inclined screen 402 with the airflow, enters the third cavity c, passes through the first air inlet 5, and is carried by the airflow into the classifier 7. In the classifier 7, it is classified; finer particles are carried by the airflow to other classification equipment or released or recycled after purification, while coarser particles are discharged through the third discharge port 701 of the classifier 7. The size of the selected material particles can be controlled by controlling the rotation speed of the classifier 7.

[0065] The material is driven upwards and forwards by the rotating drum. During this process, relative motion occurs between the material and the screen, resulting in screening. The material is biased to one side and dispersed under the influence of the drum, such as... Figure 3 , 4 As shown in Figure 5, a first air inlet 2 is provided on the material side. Under the action of the airflow entering through the first air inlet 2, the material can be divided into four different paths. Small particles and powders can pass directly through the screen. Some materials are blown by the wind to the opposite side where there are no materials or the material layer is thin, which can make full use of the screen area and improve screening efficiency. Small particles can pass through the drum screen 104, the longitudinal screen 401, and the inclined screen 402 under the action of the airflow and reach the third chamber c, but it is difficult to enter the classifier 7 through the air inlet. Under the action of gravity, they sink and are discharged from the second discharge port 107. Medium particles can pass through the drum screen 104 under the action of the airflow and the drum screen 104, but are blocked at the longitudinal screen 401 and the inclined screen 402. Under the action of gravity, they slide down to the corresponding first discharge port 106 and are discharged.

[0066] Large particles cannot pass through the drum screen 104. The airflow has little impact on their movement trajectory. Under normal circumstances, they fall back onto the drum screen 104 and move forward under the action of the drum. Finally, they can be discharged from the screen outlet 109.

[0067] like Figure 3As shown, a second air inlet 6 is provided above the first discharge port 106 of the second cavity b. The second air inlet 6 is located below the drum screen 104 and on the same side as the first air inlet 2. An inclined screen 402 is provided opposite the second air inlet 6. The second air inlet 6 is connected to a ventilator 3. The second air inlet 6 is located below the first air inlet 2 and close to the first discharge port 106. During the process of moving and being lifted by the drum screen 1, some material can pass through the drum screen 104 and fall. During the falling process, if the material falling into the second cavity b contains fine powder, it can be forced through the longitudinal screen 401 and the inclined screen 402 into the third cavity c by the airflow introduced by the second air inlet 6. The airflow of the second air inlet 6 can be adjusted, so that fine powder can also pass through the first air inlet 5 into the subsequent fine powder collection device.

[0068] A feed inlet 1010 is provided at the end of the rotary drum screen 1, and a third air inlet 8 is provided at the end of the feed inlet 1010. Specifically, the third air inlet 8 is located at the bottom of the feed inlet 1010. The air intake of the third air inlet 8 can be natural wind or air supplied by a fan. When the material enters the feed inlet 1010 of the rotary drum screen 1, it is first dispersed according to the different particle sizes by the airflow at the third air inlet 8. The smaller the particles, the farther they move with the wind and the wider they are dispersed, which helps with sorting. At the same time, it prevents the accumulation of powder and fine particles in the lower layer and blockage of the mesh, thus playing a cleaning role. The larger particles are less affected by the wind and fall directly onto the rotary drum screen 104 near the feed inlet.

[0069] In other specific embodiments, such as Figure 4 , Figure 6 and 7As shown, the cylinder driving device 18 includes a drive wheel and a drive motor. The drive wheel is located on the outside of the cylinder, and the drive motor drives the drive wheel to rotate, thereby driving the cylinder to rotate. The drum screen sealing cover 105 includes two sections of drum screen sealing cover 105 arranged along the axial direction of the drum screen 1. The third cavity c is connected to the second cavity b formed by the first section of the drum screen sealing cover 105 near the feed inlet 1010 of the drum screen 1. The first section of the drum screen sealing cover 105 corresponds to the screening of finer particles in the first section of the drum screen 104. The inner circular surface of the drum screen 104 is provided with circumferentially evenly spaced cloth-laying devices 9. The cloth-laying devices 9 are disposed in the drum screen 104 corresponding to the second cavity b on the side near the third cavity c. Specifically, the cloth-laying device 9 includes a support ring group 901, an outer fixing plate 902, and an inner fixing plate 903. The plate 903 connects to the fabric upright plate 904. The support ring group 901 includes an upper support ring 9011 and a lower support ring 9012. The upper support ring 9011 and the lower support ring 9012 are sleeved on the outer ring of the drum screen 104 and are arranged parallel and spaced apart. The outer fixing plate 902 is disposed on the outside of the support ring group 901, and the inner fixing plate 903 is disposed on the inside of the drum screen 104. The outer fixing plate 902 and the inner fixing plate 903 are fixedly connected by bolts and clamp the support ring group 901 and the drum screen 104 to fix them, so that the fixing force is evenly distributed, reducing the local stress deformation of the drum screen 104, and also avoiding clogging of the screen mesh, thereby improving the sorting and screening efficiency. As the drum screen 104 rotates, the material-laying plate 904 rolls up the material to be sorted. During the rolling process, the material is scattered, bounced, and rolled up again. This increases the height and quantity of the rolled-up material, as well as the scattering area, the number of impacts, and the impact height. This facilitates the full dispersion of the material within the cross-section of the drum screen 104 and the full removal of dust. At the same time, the collision and bounce of the aggregates cause some cracked aggregates to be initially broken, releasing dust from the gaps. In addition, the fully dispersed material forms a rotating, semi-closed material curtain on the cross-section of the drum where the material-laying plate 904 is located, dividing the space within the drum screen 104 into segments. This is more conducive to the relatively concentrated and enclosed processing of stone powder and fine particles, improving the conveying capacity per unit conveying area under the same configuration and energy consumption, and increasing the sorting efficiency.It should be noted that this application can provide multiple sections of the material distribution device 9 along the axial direction of the inner wall of the drum screen 104. For example, three rings of the material distribution device 9 can be evenly distributed within the drum screen 104 corresponding to the second cavity b on the side near the third cavity c. A first air inlet 2 is respectively provided between the material distribution uprights 904 of adjacent rings. This allows for full-section distribution and screening of the aggregate within this section of the drum screen 104. Combined with the inclined arrangement of the through-screen, the aggregate is fully distributed in sections during the conveying process towards the tail end, and the airflow is naturally isolated and divided. This, along with the wind separation of the first and third air inlets, increases the usable area of ​​the drum screen 104 and improves screening and sorting efficiency and effectiveness. In other specific embodiments, such as… Figure 2 As shown, a discharge cover 1012 is provided on the discharge port 109 of the screen. A second air inlet 1011 may also be provided on the discharge cover 1012 and / or the sealing cover 105 of the second section of the drum screen. The second air inlet 1011 is connected to the dust collection device 16 for dust collection and removal.

[0070] like Figure 5 As shown, in other specific embodiments, a screen vibrator 9 can also be provided to vibrate the longitudinal screen 401 and the inclined screen 402 to prevent clogging. One end of the screen vibrator 9 is connected to the screen, and the other end is equipped with a vibration source, with the middle elastically suspended on the housing.

[0071] The grading and sorting in this embodiment is precise and efficient, and it is less likely to produce oversized particles in fine materials or powders. Particles are divided into multiple grades according to size, which can meet the needs of more application scenarios. At the same time, this embodiment has relatively low vibration, and each part of the space can be effectively sealed to prevent dust leakage, reduce the use of dust collection equipment, and is green, efficient, and environmentally friendly.

[0072] Third Embodiment

[0073] Please see Figure 3 , 4 As shown in Figure 5, based on the drum screen grading and powder classifying devices provided in the first and second embodiments of this application, the third embodiment of this application proposes another drum screen grading and powder classifying device. The third embodiment is merely a preferred embodiment of the first and second embodiments, and the implementation of the third embodiment will not affect the individual implementation of the first and second embodiments.

[0074] Specifically, the difference in the drum screen grading and powder selection device provided in the third embodiment of this application is that the upper part of the third chamber c is connected to the powder classifier 7, and the airflow discharged from the powder classifier 7 is connected to the fine powder collection device 11 through the air separation pipe 10. The filtered airflow of the fine powder collection device 11 is returned to the first air inlet 2 through the return air pipe 12 and flows back to the drum screen 1 to form a cycle. A micro powder pipe 13 is provided on the return air pipe 12, and a part of the airflow enters the micro powder collection device 14 through the micro powder pipe 13. Specifically, as shown in the figure... Figures 1 to 9 The diagram shows a rotary drum screen grading and powder classifying system, comprising a rotary drum screen 1, a powder classifier 7, a fine powder collection device 11, a micro powder collection device 14, a return air duct 12, and a micro powder duct 13. The first air inlet 2 is the main air inlet, externally connected to a fan 3. The airflow discharged from the powder classifier 7 enters the fine powder collection device 11 through the air classifier duct 10. The filtered airflow returns to the fan 3 inlet via the return air duct 12, flowing back to the rotary drum screen 1 to form a cycle. A micro powder duct 13 is installed on the return air duct 12, through which a portion of the airflow enters the micro powder collection device 14, where fine powder is captured. Clean airflow meeting emission requirements is discharged into the atmosphere.

[0075] Fourth embodiment

[0076] Please see Figures 1 to 12 As shown, based on the drum screen grading and powder selection device provided in the first, second, and third embodiments of this application, the fourth embodiment of this application proposes a sorting system. The fourth embodiment is merely a preferred embodiment of the first, second, and third embodiments, and its implementation will not affect the individual implementation of the first to third embodiments.

[0077] Specifically, the sorting system provided in the fourth embodiment of this application differs in that:

[0078] like Figure 10 As shown, a sorting system includes a drum screen grading and powder sorting device, a vibrating screen A, a vibrating screen B, and a vibrating screen C. The discharge port of the drum screen 1 is connected to the feed ports of the vibrating screens A, B, and C, respectively. The vibrating screens can be selected as having a single layer, two layers, or multiple layers.

[0079] like Figure 10 , Figure 11 and Figure 12The diagram shows a combination of a drum screen grading and classifying device with a powder classification system and a vibrating screen. The vibrating screen is a two-layer structure of a vibrating screen assembly. The material discharged from the second outlet 107 is mixed with the finished product D. In addition to the lower drum screen grading and classifying device, three more finished products can be produced: finished product D, finished product E, and finished product F, which are discharged from their respective discharge ports. Each type of material discharged from each drum screen 1 can form three finished products on each set of vibrating screens. It should be noted that the second outlet 107 can discharge material alone or be connected to the vibrating screen's discharge hopper to mix with the undersize material and then discharge as finished product D.

[0080] like Figure 11 and Figure 12 As shown, a flap 15 can also be installed between the finished product chutes, and the flap 15 can be switched on and off as needed to further control the type of finished product.

[0081] This embodiment has the following beneficial effects:

[0082] 1. Space-saving and simple structure. It occupies a small area and has a low height. While screening materials, the drum screen also conveys the materials forward as the drum rotates, simultaneously completing the screening, dispersion, and conveying of materials. It is lower in height and occupies less space than ordinary vibrating screens.

[0083] 2. By combining drum screens and vibrating screens, finished products of various specifications can be produced, overcoming the problems of single finished product, complex structure, and difficulty in control in existing screening systems.

[0084] 3. Precise and efficient grading and sorting, minimizing the presence of oversized particles in fine materials or powders. Particles are divided into multiple grades based on size, catering to a wider range of applications.

[0085] 4. Energy saving. Rotary drum screens or vibrating screens consume less power than ordinary vibrating screens or probability screens.

[0086] 5. Safe and environmentally friendly. The dynamic load of drum screens and vibrating screens is small, sometimes negligible, and unlikely to cause harm to buildings or people. In addition, the shell of drum screens and vibrating screens is stationary, so it can be completely sealed, and dust can hardly escape, overcoming the problem of other vibrating screens having too large gaps between the guard and the shell, which cannot be effectively sealed.

[0087] 6. High product precision: The particle size of materials and stone powder can be precisely controlled. The particle size of stone powder can be precisely controlled using a dynamic air classifier. The dimensional accuracy of each stage of the product is higher than that of air sieves and probability screens.

[0088] 7. Low vibration, low noise, and low power consumption. The movement of a drum screen is mainly rolling, resulting in very low vibration and noise, far lower than other commonly used vibrating screens. In a vibrating screen, only the screen mesh vibrates; the screen box does not participate in the vibration, resulting in low vibration and low noise.

[0089] 8. It can produce a wider variety of products, and can process sand and gravel simultaneously, achieving multiple uses in one machine. It also facilitates further processing of products of different specifications.

[0090] 9. Easy to implement modular design, reducing costs.

[0091] 10. High screening efficiency: Due to the easy anti-clogging properties of drum screens and vibrating screens, the screens are not prone to blockage. For fine materials that are difficult to screen, the screening efficiency is higher than other types of vibrating screens. Furthermore, multiple screening operations are used to ensure more thorough screening.

[0092] 11. Easy to operate and maintain.

[0093] 12. It is not sensitive to the moisture content in the material.

[0094] 13. Alternatively, a hot air device can be introduced into the air inlet to dry the excessive moisture content in the raw materials.

[0095] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The terms "first," "second," "third," etc., are used only to distinguish features and are not intended to limit the number of features.

[0096] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A roller screen grading and powder selecting device, comprising a roller screen, the roller screen comprising a base, a support device, a cylinder body and a cylinder body driving device, the cylinder body comprising a roller screen mesh and a mesh support, characterized in that, a first cavity is enclosed in the roller screen mesh; a roller screen sealing cover is arranged on the outer periphery of the cylinder body, a second cavity is enclosed between the roller screen mesh and the roller screen sealing cover; a first discharge port is arranged below the second cavity; the material is lifted upward and moved forward under the driving of the rotating roller, and the material is deviated to one side and dispersed under the driving of the roller; a first air inlet is arranged on the roller screen sealing cover on one side of the material lifting section in the cylinder body, and the first air inlet is connected with an air inlet device; the air inlet parameters of the first air inlet and the mesh number of the stone powder screen mesh are adjustable, so that the content of stone powder and fine particle material can be controlled; a third cavity is arranged on the outer side of the roller screen sealing cover on the opposite side of the first air inlet; a second discharge port is arranged at the lower end of the third cavity, and a stone powder screen mesh is arranged between the third cavity and the second cavity; the stone powder screen mesh comprises a longitudinal screen mesh and an inclined screen mesh, the lower side of the inclined screen mesh is arranged in a left-to-right inclination towards the first discharge port, and the longitudinal screen mesh and the inclined screen mesh are connected with the side and lower side of the first cavity; the lower side of the inclined screen mesh is connected with the lower part of the first discharge port, so that the first discharge port is connected with the third cavity through the inclined screen mesh.

2. A roller screen classification and pulverizing plant according to claim 1, wherein, The angle between the cross-sectional extension line of the lower side of the inclined screen mesh and the vertical direction is not less than 30 degrees and not more than 60 degrees.

3. A roller screen classification and pulverizing plant according to claim 1, wherein, A negative pressure air inlet is arranged above the third cavity, and the negative pressure air inlet is connected with a negative pressure fan or a powder selecting machine.

4. The roller mill classifying and pulverizing system according to claim 1, wherein, A second air inlet is arranged above the first discharge port of the second cavity, the second air inlet is located below the roller screen mesh and on the same side of the first air inlet, the opposite side of the second air inlet is provided with the stone powder screen mesh, and the second air inlet is connected with an air inlet device.

5. The roller mill classifying and pulverizing system according to claim 1, wherein, A feeding port is arranged at the end of the roller screen, and a third air inlet is arranged at the end of the feeding port, and the third air inlet is connected with an air inlet device.

6. The roller mill classifying and pulverizing system according to claim 1, wherein, The roller screen sealing cover comprises a plurality of sections arranged along the axial direction of the roller screen, each section of the roller screen sealing cover divides the second cavity into a plurality of sections, and the third cavity is connected with the second cavity of the first section close to the feeding port of the roller screen; a powder selecting machine is connected above the third cavity, the air flow discharged by the powder selecting machine is connected with a fine powder collecting device through an air flow pipeline, and the filtered air flow of the fine powder collecting device is returned to the first air inlet through a return air pipeline to form a circulation to the roller screen.

7. The roller mill classifying and pulverizing system according to claim 1, wherein, The cylinder body driving device comprises a driving wheel and a driving motor, the driving wheel is arranged on the outer side of the cylinder body, and the driving motor drives the driving wheel to rotate and in turn drives the cylinder body to rotate.

8. A roller mill classification and pulverizing plant according to claim 1, wherein The inner circular surface of the drum screen is provided with a material distribution device uniformly and evenly distributed in a circle, the material distribution device is arranged in the drum screen corresponding to the second cavity on the side close to the third cavity, the material distribution device comprises a support ring group, an outer fixed plate and an inner fixed plate, the inner fixed plate is connected with a material vertical plate, the support ring group comprises an upper support ring and a lower support ring, the upper support ring and the lower support ring are sleeved on the outer ring of the drum screen and are arranged in parallel and at intervals, the outer fixed plate is arranged on the outer side of the support ring group, the inner fixed plate is arranged on the inner side of the drum screen, and the outer fixed plate and the inner fixed plate are fixedly connected by clamping the support ring group and the drum screen.

9. A hierarchical system characterized by: The drum screen grading and powder selecting device comprises the drum screen grading and powder selecting device according to any one of claims 1 to 8, and a discharge port of the drum screen grading and powder selecting device is communicated with an inlet of a vibrating screen, and the vibrating screen is one layer or multiple layers.

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