Combined movable screening device and using method

Abstract

The invention relates to the technical field of garbage treatment, in particular to a combined type movable screening device, a movable rolling shaft screening machine and a movable flip-flow screening machine are of a split type structure, and the movable rolling shaft screening machine and the movable flip-flow screening machine are arranged in series front and back; the output end of the movable roller screening machine is connected with the input end of the movable flip-flow screening machine, so that part of materials treated by the movable roller screening machine are conveyed to the movable flip-flow screening machine to be classified and screened again; the plate chain machine and the roller screen are stacked up and down, the layout is compact, the length of the whole machine is greatly reduced, the road transportation requirement is met, meanwhile, sealing is conducted through the housing, and extra dust points cannot be generated; each conveyor adopts a hydraulic folding mode, can be quickly folded during transition, is efficient in transition and can be used while arriving, and the overall efficiency of screening operation is improved; precise particle size control is realized; the screening efficiency is improved; triple dust removal is achieved, it is ensured that dust stacking reaches the standard, and environment-friendly shutdown is avoided.

Description

Technical Field

[0001] This invention relates to the field of waste treatment technology, and in particular to a combined mobile screening device and its usage method. Background Technology

[0002] With the acceleration of urbanization, the output of solid waste such as construction waste and renovation waste is increasing year by year, making its resource utilization an important issue for environmental protection and sustainable development. As a core link in solid waste treatment, the performance of screening equipment directly affects the effectiveness of subsequent treatment and recycling, as well as the capacity and economic benefits of the entire treatment line.

[0003] Currently, commonly used screening equipment is widely used in solid waste pretreatment due to its impact resistance and adaptability to large-particle materials. However, existing roller screens suffer from low screening efficiency: firstly, their layout is often unreasonable, employing a left-right, high-low arrangement where the chain conveyor and roller screen are horizontally misaligned. This results in a large overall length, often exceeding the transport limit of flatbed trucks. During relocation, some components need to be disassembled, and upon arrival at the site, reinstallation and debugging are required, severely impacting the equipment's mobility and rapid deployment capabilities, thus hindering continuous and efficient screening operations.

[0004] On the other hand, regarding screening accuracy, traditional roller screens typically employ a staggered installation method for the screen discs, with the discs on adjacent rollers interlacing to form irregular screen holes. While this structure can prevent material jamming to some extent, it also results in uneven screen hole sizes, making precise particle size control difficult. This leads to the inclusion of excessive particles in the undersize material, necessitating a return screening process and reducing screening efficiency. Furthermore, the staggered installation of the screen discs makes it easy for long strips of material to become entangled on the rollers or forcibly pulled through the screen holes, affecting screening performance and potentially causing equipment jamming and shutdown, further reducing production efficiency.

[0005] When processing materials with high moisture and high mud content, the screening efficiency of traditional roller screens decreases even more significantly. Wet and sticky materials tend to accumulate on the screen surface and clog the screen holes, resulting in a reduction in the effective screening area, obstructed material flow, and a drop in screening efficiency to less than 50% of normal operating conditions, seriously affecting the continuous and stable operation of the production line.

[0006] In terms of dust control and environmental protection, most existing screening equipment is designed as an open type, and the dust generated during the screening process is not collected by a dust collection system. In particular, there is a lack of effective dust collection devices at key dust-generating points such as the feed inlet and discharge outlet. With increasingly stringent environmental protection requirements, this open structure can no longer meet environmental standards. Frequent shutdowns and rectifications due to non-compliance with environmental standards have further affected the continuity and overall efficiency of screening operations.

[0007] In the separation of lightweight materials, existing technologies typically employ air classifiers to separate the materials. However, during the air classification process, the airflow tends to accumulate in localized areas, forming eddies that cause lightweight materials to disperse and fail to settle and be collected effectively. Furthermore, during the transport of the separated lightweight materials, residual fine particles and moisture cannot be further removed, affecting subsequent processing.

[0008] Furthermore, existing screening equipment is functionally limited, typically only performing screening. It requires multiple independent units to complete processes such as air separation, dust removal, and conveying, resulting in complex inter-equipment connections, large floor space requirements, and high labor costs. Each piece of equipment operates independently, lacking a unified control system, making centralized monitoring and collaborative operation impossible.

[0009] In terms of power systems, most existing mobile equipment is driven by diesel engines, which consumes a lot of energy and produces a large amount of carbon when moving short distances and relocating. It also generates noise and exhaust pollution, which is not in line with the trend of green and environmentally friendly development.

[0010] Therefore, developing a combined mobile screening device that is compact in layout, has high screening accuracy, good dust removal effect, integrated functions, intelligent control, and is environmentally friendly and energy-saving has important practical significance and application value. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to provide a combined mobile screening device and its usage method that can handle a variety of complex construction wastes, has a better processing effect than traditional screening and discharge, and can be quickly transferred and is environmentally friendly and dust-suppressing.

[0012] The technical solution adopted by this invention to solve its technical problem is: a combined mobile screening device, comprising: Mobile roller screens, as primary screening equipment, perform preliminary screening of raw materials and separate some of the materials. The mobile tension screening machine, as a secondary screening equipment, is a separate structure from the mobile roller screening machine. The mobile roller screening machine and the mobile tension screening machine are arranged in series to form a two-stage screening line, which further classifies and screens the undersize material after the primary screening, so as to realize the continuous and graded processing of materials. The output end of the mobile roller screen is connected to the input end of the mobile tension screen, so that part of the material processed by the mobile roller screen is transported to the mobile tension screen for further grading and screening, realizing the material flow between the two machines. This allows the material after primary screening to be transported to the secondary screening equipment. After arriving at the project site, the equipment can be quickly set up and put into production, realizing multi-stage screening of materials and improving screening accuracy and efficiency.

[0013] Furthermore, the mobile roller screening machine includes: The first mobile chassis enables the overall movement of the roller screening machine, facilitating relocation and on-site setup. The first body is mounted on a mobile chassis, on which the first intelligent control cabinet and battery pack are installed; The cover is located at both ends of the first body. After being assembled with the body, it forms a shell cavity inside, creating a screening space to prevent dust from spilling out, and also serves as the mounting base for internal components. The plate chain conveyor, located on the first machine body, is used to carry the material fed by the excavator and transport the material. The roller screen is used to receive and screen materials from the plate chain conveyor, separating them according to particle size. It is positioned directly below the plate chain conveyor, forming a stacked arrangement that integrates with it to solve space issues, significantly reducing the overall length of the machine and meeting road transport requirements. It also facilitates sealing through the casing. The discharge end of the plate chain conveyor faces the feed end of the roller screen, allowing material to fall from the plate chain conveyor onto the roller screen. A gap exists between the casing and the plate chain conveyor, forming the feed inlet, which serves as a channel for material entry and also as one of the dust collection points. A gap also exists between the casing and the roller screen, forming the discharge outlet, which serves as a channel for material discharge, and also as a dust collection and air separation point. The undersize discharge conveyor is located below the roller screen and is used to transport the material screened by the roller screen to the mobile tension screen. The first dust removal system is installed on the first machine body. One end of the first dust removal system is located at the feed chamber, and the other end of the first dust removal system is located at the discharge chamber. It is used to collect and treat the dust at the feed chamber and the discharge chamber to achieve environmentally friendly operation. The large material discharge conveyor is located at the output end of the roller screen and is used to receive and transport large-sized materials. The air separator improves the cleanliness of materials by removing light particles. It is installed on the first body with its air outlet facing the discharge port of the large material. It uses air force to separate light particles from the material. The lightweight material discharge conveyor is installed on the first body and is located close to the large material discharge conveyor to transport lightweight materials after air separation.

[0014] Furthermore, the roller screen includes: Multiple rollers are arranged side by side to convey and screen materials by rotation. Several sieve discs are arranged along the axial direction on each roller, and the corresponding sieve discs on each roller are all on the same straight line. A roller gap is formed between adjacent sieve discs on two adjacent rollers. The roller gap is square in shape, so that the undersize material can fall through the square gap, achieving precise particle size separation.

[0015] Furthermore, the mobile tension screening machine includes: The second mobile chassis enables the overall movement of the tension screening machine, facilitating relocation and on-site setup. The second body is mounted on the second mobile chassis, on which the second intelligent control cabinet and battery pack are installed; The double-layer tension screen, located on the second machine body, is used to receive and screen the undersize material conveyed by the mobile roller screener. It consists of an upper tension screen and a lower tension screen. The upper tension screen separates the medium material with larger particle size, while the lower tension screen separates the small material and powder with smaller particle size. The tension screen cover is installed on the outside of the double-layer tension screen. It has a feed inlet that connects to the undersize material discharge conveyor of the mobile roller screen to prevent dust from spilling out. The second dust removal system is installed on the second body. The second dust removal system is connected to the tension screen cover through a dust suction pipe to collect and treat the dust inside the tension screen cover, so as to achieve environmental protection operation. The intermediate material discharge conveyor is installed at the discharge end of the upper tension screen in the double-layer tension screen to receive and transport the screened intermediate material. The small material discharge conveyor is installed at the discharge end of the lower tension screen in the double-layer tension screen to receive and transport the small materials after screening. The powder transfer conveyor is installed below the double-layer tensioned screen and is used to receive and transfer the powder after it has been screened by the lower tensioned screen of the double-layer tensioned screen. A powder discharge conveyor, which works in conjunction with a powder transfer conveyor to transport powder materials.

[0016] Furthermore, a feeding conveyor is also installed on the second body. One end of the feeding conveyor is connected to the feed inlet of the tension screen cover, and the other end of the feeding conveyor is connected to the undersize discharge conveyor of the mobile roller screen.

[0017] Furthermore, both the first dust removal system in the mobile roller screening machine and the second dust removal system in the mobile tension screening machine include: A dust collector is used to separate dust from gas after it has been processed by a light material separator. A negative pressure fan is installed at the outlet of the dust collector to supply air to the entire device. The lightweight material separator is installed at the feed end of the dust collector to perform secondary separation of powdery and lightweight materials in the collected dust-laden gas. The light material separator includes: The shell, with an internal cavity forming a receiving chamber; The filter element is rotatably mounted in the housing cavity and is used to separate the powdery and lightweight materials of the dust-laden material during rotation. The material inlet is located on the upper side wall of the shell and is used for feeding dusty materials. The dust outlet is the outlet for the separated powdery material. It is located on one side of the housing, and the other side of the housing opposite the dust outlet is a closed surface to ensure airflow guidance so that the powdery material can only be discharged from the dust outlet. The discharge port, located at the lower end of the shell, is used to discharge the separated light materials; The airlock is located at the bottom of the housing. The airlock core rotates to discharge light materials and prevents the atmosphere from entering the housing in the opposite direction. The airlock has a discharge port for light materials at the bottom, which is the final outlet for the light materials discharged from the airlock.

[0018] Furthermore, the dust collector includes: The separator has a hollow inner cavity inside, which serves as the working space for gas-solid separation. The tube sheet is horizontally installed in the inner cavity of the separator, dividing the inner cavity of the separator into a lower dust-containing chamber and an upper clean air chamber, and also serving as a support plate for the filter cartridges. Several round holes are opened on the surface of the tube sheet for installing the filter cartridges, so that the dust-containing chamber and the clean air chamber can be connected by airflow through the filter cartridges. Several filter cartridges are installed below a corresponding circular hole and suspended in the dust-laden chamber as the core filter element to capture dust particles in the dust-laden gas and allow clean gas to enter the clean air chamber. The air inlet is located on the side wall of the separator and is connected to the air outlet of the horizontal separator. The air inlet is located in the area corresponding to the dust-containing chamber and receives the pre-treated dust-containing gas. The air outlet is located on the side wall of the separator and is connected to the air inlet of the negative pressure fan. The air outlet is located in the area corresponding to the clean air chamber to discharge the purified gas. The dust hopper, installed below the separator, is used to collect dust after it has been removed by the filter cartridge. It serves as a temporary storage and collection point. A dust discharge valve is installed at the outlet of the dust hopper, which also acts as an airlock to prevent external air from entering and affecting the negative pressure working environment of the system.

[0019] Furthermore, a feeding conveyor is also installed on the second body. One end of the feeding conveyor is connected to the feed inlet of the tension screen cover, and the other end of the feeding conveyor is connected to the undersize discharge conveyor of the mobile roller screen.

[0020] Furthermore, it also includes at least one mobile belt conveyor, which is installed at the discharge end of at least one of the undersize material discharge conveyor, large material discharge conveyor, and light material discharge conveyor in the mobile roller screening machine, and the medium material discharge conveyor, small material discharge conveyor, and powder material discharge conveyor in the mobile tension screening machine, for transferring the material output by the corresponding conveyor to a designated location or downstream equipment; The undersize material discharge conveyor, large material discharge conveyor, and light material discharge conveyor in the mobile roller screening machine, and the medium material discharge conveyor, small material discharge conveyor, and powder material discharge conveyor in the mobile tension screening machine, are all set up with hydraulic folding.

[0021] Furthermore, it also includes a central control vehicle, which serves as the control center for the entire screening device, enabling centralized control and collaborative operation. The central control vehicle is electrically connected to the first intelligent control cabinet in the mobile roller screening machine and the second intelligent control cabinet in the mobile tension screening machine, thereby enabling signal transmission and command issuance between the central control vehicle and the control cabinets of each device. The first intelligent control cabinet controls the operation of each component of the mobile roller screening machine, and the second intelligent control cabinet controls the operation of each component of the mobile tension screening machine.

[0022] A method for using a combined mobile screening device, wherein the screening operation is performed using a combined mobile screening device as described in any of the above-mentioned embodiments, and the specific steps are as follows: Step 1: Feeding process. The raw materials are fed into the screening system to start the processing flow: The material is fed into the plate chain conveyor of the mobile roller screen by an excavator or other device. The plate chain conveyor carries and receives the material. Step 2: One screening process to achieve primary particle size separation of materials, separating undersize material from oversize material: Start the plate chain conveyor to transport the material, which is transported to the end of the plate chain conveyor and falls onto the roller screen; Each roller of the drive roller screen rotates clockwise, and the material is screened in the gap between the rollers. The undersize material with a particle size smaller than the gap between the rollers falls from the gap between the rollers to the undersize material discharge conveyor, while the material with a particle size larger than the gap between the rollers is continued to be conveyed to the output end of the roller screen by the rollers. Step 3: Air separation and sorting process. Lightweight materials are separated by air power, and impurities in large-sized materials are removed by manual sorting: Materials larger than the gap between the roller screens fall downwards. During the falling process, the air separator is activated. The air nozzle of the air separator is directly facing the discharge port of the large material, blowing the lightweight materials into the lightweight material discharge conveyor. The remaining large-sized materials fall into the large material discharge conveyor. Meanwhile, large-sized materials are manually sorted at the manual sorting stations on both sides of the large material discharge conveyor, and are protected by sunshades and rain shelters. Step 4: First dust removal process to control dust accumulation during primary screening and achieve environmental protection: Simultaneously with the above steps, start the first dust removal system to collect and treat dust at the feed inlet and the discharge outlet of the bulk material. Step 5: Secondary screening process, the undersize material from the primary screening is finely separated to obtain three products: medium material, small material and powder. The undersize material discharge conveyor transports the undersize material to the double-layer tension screen of the mobile tension screening machine for secondary screening. After screening, it is divided into medium material, small material and powder. Among them, the medium material on the upper tension screen of the double-layer tension screen is conveyed to the medium material discharge conveyor and output; Small materials on the lower tension screen of the double-layer tension screen are conveyed to the small material discharge conveyor and output; The powder falls onto the powder transfer conveyor, is transferred to the powder discharge conveyor and output; thus completing the grading and screening. Step 6: Second dust removal process to control dust accumulation during secondary screening and achieve environmentally friendly operation: Simultaneously with the above steps, start the second dust removal system to collect and process the dust inside the tension screen cover.

[0023] The beneficial effects of this invention are: 1. The plate chain conveyor and roller screen are stacked on top of each other, which is compact and greatly reduces the overall length of the machine, meeting the requirements of road transportation. At the same time, the cover is sealed to prevent the generation of additional dust points. Each conveyor adopts a hydraulic folding method, which can be quickly folded up when changing sites, making the transfer efficient and ready to use immediately, thus improving the overall efficiency of screening operations. 2. The screen plates are installed in a straight line to form square screen holes, enabling precise particle size control; the roller gap is adjustable from 30 to 60 mm to adapt to different materials; the double-layer tension screen separates medium, small and powder materials into three specifications in one pass, with fine grading and improved screening efficiency compared to traditional equipment. 3. The device adopts a three-in-one dust suppression system of "source-process-end". The first and second dust removal systems accurately collect dust from the feed inlet, discharge outlet and screening process; the dust collector and the light material separator are combined for purification to ensure that the dust meets the standards, realize triple dust removal, ensure that the dust storage meets the standards, and avoid environmental protection shutdowns. 4. The air separator uses frequency conversion adjustment for efficient separation of light materials; the manual sorting station removes impurities from large-sized materials. The combination of air separation and sorting ensures high material purity; at the same time, the light material conveyor belt adopts a hollow mesh structure, which uses the "suction wall effect" to prevent light materials from scattering, improving separation efficiency by more than 20%.

[0024] 5. The central control vehicle enables centralized monitoring, parameter adjustment, and fault early warning for the entire unit, improving collaborative operation efficiency. For short-distance movement, it uses battery power; during operation, it connects to mains power, eliminating the need for a diesel engine and reducing carbon emissions and operating costs. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the mobile roller screening machine of the present invention in its unfolded state; Figure 3 This is a cross-sectional view of the mobile roller screening machine of the present invention; Figure 4 This is a schematic diagram of the folded structure of the mobile roller screening machine of the present invention; Figure 5 This is a schematic diagram of the structure of the rolling screen in the mobile roller screening machine of the present invention; Figure 6 This is a schematic diagram of the unfolded state of the mobile tension screening machine of the present invention; Figure 7 This is a cross-sectional view of the mobile tension screening machine of the present invention; Figure 8 This is a schematic diagram of the folded structure of the mobile tension screening machine of the present invention; Figure 9 This is a schematic diagram of the structure of the first dust removal system and the second dust removal system of the present invention; Figure 10 This is a schematic diagram of the lightweight material separator in Embodiment 1 of the present invention; Figure 11 yes Figure 10 A structural diagram from another direction; Figure 12 This is an exploded view of the lightweight material separator in Embodiment 1 of the present invention; Figure 13 This is a cross-sectional view of the lightweight material separator in Embodiment 1 of the present invention; Figure 14 This is a cross-sectional view of the lightweight material separator in Embodiment 1 of the present invention from another direction; Figure 15 This is a partial enlarged view of point A in the present invention; Figure 16 This is a cross-sectional view of the dust collector in Embodiment 1 of the present invention; Figure 17 This is another structural schematic diagram of the dust collector in Embodiment 1 of the present invention; Figure 18 This is the present invention. Figure 17 A sectional view; Figure 19 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 20 This is a schematic diagram of the structure of Embodiment 3 of the present invention; In the diagram: 100, Mobile roller screening machine; 11, Cover; 111, Inspection port; 12, Plate chain conveyor; 13. Roller screen; 131. Roller; 132. Screen disc; 14. Undersize material discharge conveyor; 15. First dust removal system; 151. Dust collector; 15113. Air outlet; 15114. Separator body; 15115. Air inlet; 1514. Airflow distribution plate; 1515. Tube plate; 1516. Circular hole; 1517. Filter cartridge; 1518. Blowpipe; 1519. Air tank; 15110. Air nozzle; 15111. Ash hopper; 15112. Ash discharge valve; 152. Lightweight material separator; 1521. Shell; 1522. Dust outlet; 1523. Material discharge port; 1524, Filter element; 15241, Filter rotating assembly; 15242, Filter screen; 15243, Filter hole; 15244, Fin; 15245, First annular plate; 1525. Lightweight material discharge port; 1526. Airlock mechanism; 1527. Airlock fan; 1528. Second annular plate; 1529. Positive atmospheric pressure air inlet; 1530. Material inlet; 1511. Air inlet; 1512. Air inlet channel; 1513. Sealing cavity; 153. Negative pressure fan; 16. First mobile chassis; 17. Air separator; 171. Protective cover; 18. Large material discharge conveyor; 181. Manual sorting station; 182. Sunshade and rain shelter; 19. Lightweight material discharge conveyor; 110. First intelligent control cabinet; 200. Mobile tension screening machine; 21. Second mobile chassis; 22. Double-layer tension screen; 23. Tension screen cover; 24. Second dust removal system; 25. Medium material discharge conveyor; 26. Small material discharge conveyor; 27. Powder transfer conveyor; 28. Powder discharge conveyor; 29. ​​Inclining device; 210. Auxiliary support; 212. Auxiliary limit component; 213. Feed conveyor; 214. Second intelligent control cabinet; 215. Hydraulic station; 300, central control vehicle; 400, mobile conveyor belt. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0028] Example 1: like Figures 1-18 The illustrated combined mobile screening device includes: The 100 mobile roller screen is well adapted to coarse screening of large-particle materials, and can also screen wet materials and materials with high moisture content. It occupies little space, which is conducive to the overall layout of the machine. It is impact resistant and has high reliability. The mobile tension screening machine 200, the mobile roller screening machine 100 and the mobile tension screening machine 200 are separate structures, and the mobile roller screening machine 100 and the mobile tension screening machine 200 are arranged in series. The output end of the mobile roller screen 100 is connected to the input end of the mobile tension screen 200 so that a portion of the material processed by the mobile roller screen 100 is conveyed to the mobile tension screen 200 for further grading and screening.

[0029] like Figures 2-5 As shown, the mobile roller screening machine 100 includes: The first mobile chassis 16 is a tracked self-propelled chassis or a towing tire chassis; The first body is mounted on a mobile chassis 16, on which the first intelligent control cabinet 110 and battery pack are installed; The cover 11 is located at both ends of the first body, and after being assembled with the body, it forms a shell cavity inside. The plate chain conveyor 12 is mounted on the first machine body and is used to carry the material fed by the excavator and transport the material. The roller screen 13 is used to receive and screen the material on the plate chain conveyor 12. The material particle size is 30-500mm (30mm adjustable). It is set directly below the plate chain conveyor 12, forming an upper and lower stacked arrangement with the plate chain conveyor 12. The structure is compact, meets the needs of road transportation, and the length of the whole machine does not exceed the length of the flatbed truck. It can be put into operation directly on site without additional installation. At the same time, the upper and lower stacked arrangement allows the plate chain conveyor 12 and the roller screen 13 to be sealed by the cover 11 and the first machine body, which will not generate additional dust points, thereby reducing the dust falling rate. Except for the feed inlet, the dust is collected and removed by the dust removal system after sealing. A gap exists between the cover 11 and the plate chain conveyor 12, forming a feed inlet. The discharge end of the plate chain conveyor 12 is directly opposite the feed end of the roller screen 13, allowing material to fall from the plate chain conveyor 12 onto the roller screen 13. A gap also exists between the cover 11 and the roller screen 13, forming a large material discharge inlet. The undersize discharge conveyor 14 is located below the roller screen 13 and is used to transport the material screened by the roller screen 13 to the mobile tension screen 200. The material particle size is 0-60mm. The discharge height of the undersize discharge conveyor 14 is adapted to the feed height of the mobile tension screen 200, with an inclination angle of 0-17°. The first dust removal system 15 is installed on the first body. One end of the first dust removal system 15 is located at the feed inlet and the other end of the first dust removal system 15 is located at the discharge outlet of the large material. It is used to collect and treat the dust at the feed inlet and the discharge outlet of the large material. The large material discharge conveyor 18 is located at the output end of the roller screen 13 and is used to receive and transport large-sized materials with a particle size of 30-500mm (30mm adjustable). The discharge point of the large material discharge conveyor 18 can withstand the impact of materials with a drop of about 1.5m. The discharge port of the roller screen 13 and the large material discharge conveyor 18 form a large material drop section, which, together with the air classifier 17, further ensures the cleanliness of the material. Manual sorting stations 181 are provided on both sides of the running direction of the large material discharge conveyor 18. Manual sorting is used to remove other impurities in large materials or light materials that have not been cleaned by the air separator 17, thus playing a role in filling gaps. The large material discharge conveyor 18 is equipped with a sunshade 182. The sunshade 182 and the manual sorting station 181 can adopt a modular interface. The manual sorting station 181 and the sunshade 182 can be manually (or hydraulically) folded and stored, which not only ensures the functionality but also facilitates transportation.

[0030] The air separator 17 uses a variable frequency fan and is installed on the first body. Its air outlet is directly opposite the material discharge chamber. It is used to separate light materials from the material. The back of the air separator 17 is equipped with a protective cover 171 to form a physical isolation. At the screening operation site, it prevents foreign objects from entering the air separator from the back, avoids wear or jamming of precision parts such as fan impeller and bearing, and extends the service life of the equipment. Lightweight material discharge conveyor 19 is installed on the first body and is located close to the large material discharge conveyor 18 to transport lightweight materials after air separation.

[0031] like Figure 5 As shown, the roller screen 13 includes: Multiple rollers 131 are arranged side by side; Several sieve discs 132 are arranged on each roller 131 along the axial direction, and the corresponding sieve discs 132 on each roller 131 are all on the same straight line and are not misaligned. A roller gap is formed between adjacent sieve discs 132 on two adjacent rollers 131. The roller gap is square in shape to achieve a precise opening, thereby facilitating accurate control of particle size, preventing material from winding around the sieve disc, and also preventing long strips of material from being pulled through the screen.

[0032] In addition, the gap between each roller 131 is adjustable, with an adjustable range of 30mm to 60mm. The gap can be adjusted later according to the actual situation. When adjusting the gap, the roller in the middle of the roller screen 13 does not move, while the rollers on both sides are adjusted to both ends. Each roller 131 is driven by an independent motor.

[0033] The lightweight material discharge conveyor 19 includes a conveyor belt with a perforated mesh. This perforated mesh conveyor belt is elastic and thin. While conveying lightweight materials, the airflow generated during the air separation process passes through the mesh and blows out from below. As the airflow passes through the mesh, it creates a negative pressure on the conveyor belt surface, causing the lightweight materials to adhere tightly to the conveyor belt surface. This prevents the airflow from accumulating in localized areas and forming eddies, avoiding the problem of lightweight materials scattering. The tight adhesion of the lightweight materials to the conveyor belt surface (suction effect) ensures stable material transport, prevents secondary scattering of lightweight materials during transport, and improves the collection rate and overall separation efficiency of lightweight materials. Additionally, as... Figure 2 As shown, several inspection ports 111 are provided on the side wall of the first body along the length direction, which facilitates maintenance and cleaning. Due to the existing open installation, the contradiction between the traditional open structure being unable to be effectively sealed or the fully enclosed structure being difficult to maintain is solved, and the troubleshooting and maintenance time is reduced, thereby improving the equipment utilization rate.

[0034] like Figures 6-8 As shown, the mobile tension screening machine 200 includes: The second mobile chassis 21 is either a tracked self-propelled chassis or a towing tire chassis; The main body is mounted on the second mobile chassis 21, on which the second intelligent control cabinet 214 and battery pack are installed; The double-layer tension screen 22, installed on the second machine body, is used to receive and screen the undersize material conveyed by the mobile roller screen 100. It consists of an upper tension screen and a lower tension screen. The tension screen is made of highly elastic polymer material, and both the upper and lower layers are tension mechanisms. Therefore, the screening grade is higher, the excitation force is higher, and the anti-clogging effect is better. At the same time, the aperture of the upper tension screen in the double-layer tension screen 22 is larger than that of the lower tension screen, realizing one-time classification and screening of medium, small and powder materials, avoiding the cumbersome process of multiple machines connected in series, and improving screening efficiency. The tension screen cover 23 is installed on the outside of the double-layer tension screen 22, and has a feed inlet that connects to the undersize material discharge conveyor 14 of the mobile roller screen 100. The second dust removal system 24 is installed on the second body. The second dust removal system 24 is connected to the tension screen cover 23 through a dust suction pipe to collect and process the dust inside the tension screen cover 23. The intermediate material discharge conveyor 25 is installed at the discharge end of the upper tension screen of the double-layer tension screen 22 to receive and transport the screened intermediate material with a particle size of 10-30mm. The small material discharge conveyor 26 is installed at the discharge end of the lower layer of the double-layer tension screen 22 to receive and transport the screened small materials with a particle size of 5-10mm. The powder transfer conveyor 27 is installed below the double-layer tension screen 22 and is used to receive and transfer the powder after screening by the lower tension screen of the double-layer tension screen 22. The powder particle size is 0-5mm. The powder discharge conveyor 28 works in conjunction with the powder transfer conveyor 27 to transport powder materials.

[0035] like Figure 6 As shown, the feed end of the double-layer tension screen 22 is equipped with an inclination device 29, which is used to support the feed end of the double-layer tension screen 22 to a height higher than its discharge end, so as to raise the feed end of the double-layer tension screen 22 and form a screen surface inclination angle. By adjusting the size of the inclination angle, the flow speed of the material on the screen surface is controlled, the screening efficiency and processing capacity are optimized, and the height is also reduced during transportation.

[0036] like Figure 6 As shown, an auxiliary limiting component 212 (for example, the auxiliary limiting component 212 is two insert sleeves connected by a pin) is also installed at the feed end of the double-layer tension screen 22 to assist the tilting device 29. When working, the tilt angle of the double-layer tension screen 22 is 10° to 30°.

[0037] like Figure 6 As shown, an auxiliary support 210 is also installed on the double-layer tension screen 22, which is located at one end of the intermediate material discharge conveyor 25.

[0038] like Figure 6 As shown, the second machine body is also equipped with a second intelligent control cabinet 214 and a hydraulic station 215.

[0039] like Figures 9-18 As shown, the first dust removal system 15 in the mobile roller screening machine 100 and the second dust removal system 24 in the mobile tension screening machine 200 adopt slide gate valves to increase the ground clearance of the ash collection hopper outlet and compress the dust removal height to meet integration requirements. Simultaneously, a miniaturized, precise, fixed-point dust removal system is used to effectively solve the problem of dust accumulation throughout the machine. Figures 9-18 As shown, both the first dust removal system 15 and the second dust removal system 24 include: Dust collector 151 is used to separate dust from gas after it has been treated by light material separator 152. Dust collector 151 uses cartridge filtration technology to capture fine particulate dust so that the emitted gas meets environmental protection standards. The negative pressure fan 153 is installed at the outlet end of the dust collector 151 and is used to provide air for the entire device. After the negative pressure fan 153 is started, a stable negative pressure environment is formed in the system, so that the dust-laden gas can flow through the light material separator 152 and the dust collector 151 in sequence to achieve continuous operation. The lightweight material separator 152 is installed at the feed end of the dust collector 151 to perform secondary separation of dust-containing materials from powdery materials and lightweight materials (such as plastics, paper, wood, foam, etc.). It adopts a horizontal structure to achieve graded recycling and avoid clogging of the dust collector 151. The lightweight material separator 152 includes: The shell 1521 has an internal cavity. The cross-sectional shape of the lower end of the shell 1521 is an inverted "V" shape, which is conducive to the light materials after separation gathering in the middle and falling smoothly into the lower airlock, preventing material accumulation. The filter element 1524 is rotatably mounted in the receiving cavity of the housing 1521 and is used to separate the powdery material from the light material during rotation. The material inlet 1530 is located on the upper side wall of the housing 1521 and is used for feeding dusty materials. Dust outlet 1522 is located on one side of housing 1521 and is the outlet for the separated powder. The other side of housing 1521 opposite to dust outlet 1522 is a closed surface to ensure airflow guidance so that the powder can only be discharged from the dust outlet. The discharge port 1523 is located at the lower end of the shell 1521 and is used to discharge the separated light material. The air shut-off fan 1527 is located below the housing 1521. Lightweight materials are discharged by the rotation of the air shut-off fan core 1526 in the air shut-off fan 1527, and the atmosphere is prevented from entering the housing 1521 in the opposite direction. A lightweight material discharge port 1525 is provided below the air shut-off fan 1527.

[0040] like Figure 12 As shown, filter element 1524 includes: The filter rotating assembly 15241 has an "H" shaped cross-section, forming an internal chamber, and there is a radial gap between the filter rotating assembly 15241 and the housing 1521. The filter screen 15242 is arranged around the outer circumferential wall of the filter rotating assembly 15241. The filter screen 15242 has a number of filter holes 15243, which allow powder to pass through and block light materials, thereby achieving the separation of powder and light materials. Multiple fins 15244 are arranged in a circular array along the circumference of the filter rotating assembly 15241 and are installed on the filter rotating assembly 15241. The fins 15244 function as blades. When the airflow passes through, it blows them to drive the filter rotating assembly 15241 inside. Lightweight materials pressed on the filter screen 15242 by the airflow are thrown into the airlock 1527 below under the action of centrifugal force generated during rotation. The angle between the fin surface of the fin 15244 and the surface of the filter screen 15242 is 45° to 60°. There is a gap between the inner wall of the housing 1521 and the outer wall of the filter screen 15242 to form a light material separation chamber, in which the light material rotates and is finally discharged from the discharge port 1523. The internal space formed by the filter rotating assembly 15241 and the filter screen 15242 forms a powder separation chamber. The outlet of the powder separation chamber is directly opposite the dust outlet 1522, so as to collect the separated powder again and discharge it from the dust outlet 1522.

[0041] like Figures 14-15 As shown, a sealing assembly is provided between the filter rotation assembly 15241 and the housing 1521, wherein, as Figure 15 As shown, the sealing assembly includes: Several layers of first annular plates 15245 are axially spaced on one side wall of the filter rotating assembly 15241. A first annular groove is formed between two adjacent layers of first annular plates 15245. An air inlet 1511 is provided between the end face of the first annular plate 15245 and the inner wall of the housing 1521. An air inlet channel 1512 is provided between the upper end face of the first annular plate 15245 and the inner wall of the housing 1521. The air inlet 1511 is connected to the air inlet channel 1512. The air inlet channel 1512 is connected to the light matter separation chamber and the powder separation chamber, and is used to introduce positive pressure gas into the light matter separation chamber and the powder separation chamber. Several layers of second annular plates 1528 are axially spaced on the inner wall of the housing 1521. A second annular groove is formed between two adjacent layers of second annular plates 1528. Parts of the ends of the second annular plates 1528 are inserted into the first annular grooves. The first annular grooves and the second annular grooves are interconnected and together form a sealed cavity 1513. There is a radial gap between the second annular plates 1528 and the first annular plates 15245. The small gap between the second annular plates 1528 and the first annular plates 15245 allows relative rotation and forms a tortuous gas flow path. Among them, such as Figure 15As shown, the width of the air inlet 1511 is smaller than the width of the sealing cavity 1513, creating a throttling effect. After the positive pressure gas enters the sealing cavity 1513 through the atmospheric positive pressure inlet 1529, the pressure diffuses, forming a stable positive pressure zone within the sealing cavity 1513, which counteracts the dust-laden airflow and ensures the airflow sealing effect. At least one positive pressure air inlet 1529 is provided on the side plate of the housing 1521 located in the second annular groove. It is used to introduce positive pressure gas from the outside atmosphere into the sealed cavity 1513, which further enhances the sealing effect, ensures that dust cannot be leaked out, improves the overall performance of the dust removal system, and ensures the continuous and stable operation of the screening operation.

[0042] like Figure 16 As shown, the dust collector 151 includes: The separator 15114 has a hollow inner cavity inside, which serves as the working space for gas-solid separation. The tube sheet 1515 is horizontally installed in the inner cavity of the separator 15114, dividing the inner cavity of the separator 15114 into a lower dust-containing chamber and an upper clean air chamber, and also serving as a mounting support plate for the filter cartridge 1517; the tube sheet 1515 has several round holes 1516 on its surface for mounting the filter cartridge 1517, so that the dust-containing chamber and the clean air chamber can be connected by airflow through the filter cartridge 1517; Several filter cartridges 1517 are installed vertically, each filter cartridge 1517 is installed below a circular hole 1516 and suspended in the dust-laden chamber, serving as the core filter element to capture dust particles in the dust-laden gas and allow clean gas to enter the clean air chamber; when the dust-laden gas flows from the outside to the inside of the filter cartridge 1517, the dust is intercepted on the outer surface of the filter cartridge 1517, the clean gas passes through the filter cartridge 1517 and enters the inside of the filter cartridge 1517, and then rises through the circular hole 1516 into the clean air chamber; The air inlet 15115 is located on the side wall of the separator 15114 and is connected to the air outlet of the light material separator 152. The air inlet 15115 is located in the area corresponding to the dust-containing chamber and receives the pre-treated dust-containing gas. The air outlet 15113 is located on the side wall of the separator 15114 and is connected to the air inlet of the negative pressure fan 153. The air outlet 15113 is located in the area corresponding to the clean air chamber, and the purified clean gas is drawn away from here by the negative pressure fan 153. The ash hopper 15111 is installed below the separator body 15114 and has an inverted conical structure. It is used to collect the dust after it has been separated by the filter cartridge 1517, and serves as a temporary storage and collection function. An ash discharge valve 15112 is installed at the outlet of the ash hopper 15111 to control the discharge of dust. It is opened periodically to discharge the dust and also serves as an airlock to prevent external air from entering and affecting the negative pressure working environment of the system.

[0043] like Figure 16 As shown, an airflow distribution plate 1514 is installed in the inner cavity of the separator body 15114, and the airflow distribution plate 1514 is directly opposite the air inlet 15115.

[0044] The airflow distribution plate 1514 has a perforated plate structure with several small holes evenly distributed on it. Its function is to rectify the incoming dust-laden gas, so that the airflow is evenly distributed in the dust-laden chamber, avoiding the direct impact of local high-speed airflow on the filter cartridge 1517, thereby extending the service life of the filter cartridge 1517 and improving the filtration efficiency.

[0045] A dust removal system is also installed in the inner cavity of the separator 15114 to periodically remove dust adhering to the surface of the filter cartridge 1517; The dust removal system includes: Air tank 1519 is installed in the clean air chamber of separator 15114 to store and supply compressed air for cleaning to blow pipe 1518. Air tank 1519 has a certain volume and can store enough compressed air to ensure sufficient air volume and pressure at the moment of blowing. Multiple blowpipes 1518 are connected to air tanks 1519 and are horizontally mounted above tube sheet 1515. Each blowpipe 1518 has several air nozzles 15110 on its body. The position of each air nozzle 15110 corresponds to a round hole 1516, that is, it is aligned with the center of a filter cartridge 1517. It is used to blow compressed air into the corresponding filter cartridge 1517 to remove dust adhering to its surface.

[0046] Below the housing 1521, a fan 1527 is also installed. The fan core 1526 rotates to discharge lightweight materials and prevents the atmosphere from entering the housing 1521 in the opposite direction.

[0047] like Figure 13 As shown, the air shut-off fan 1527 has a rotatable air shut-off fan core 1526 inside. A drive motor is installed on the side of the air shut-off fan 1527. The output end of the drive motor is connected to the air shut-off fan core 1526 to drive the air shut-off fan core 1526 to rotate. A lightweight material discharge port 1525 is provided below the air blower 1527.

[0048] The air shut-off mechanism 1526 includes a rotating shaft, and several blades are arranged in a ring array on the outer peripheral wall of the rotating shaft. There is a gap between the end face of the blades and the inner cavity wall of the air shut-off mechanism 1527.

[0049] The working process of the first dust removal system 15 and the second dust removal system 24: Step 41: Start the negative pressure fan 153. Under the action of negative pressure, the dust-containing material is sucked into the device from the material inlet 1530 of the dust collector 151. Step 42: The dust-laden material (a mixed airflow containing dust and light materials) enters the interior of the housing 1521 of the dust collector 151 through the material inlet 1530; the material inlet 1530 is located on the upper side wall of the housing 1521, and the material enters tangentially, forming a uniform material curtain on the surface of the filter element 1524. Step 43: Filter element 1524 rotates horizontally, achieving a dual separation mechanism during the rotation process: 1) Filter screen screening: When dust-laden gas flows through the filter screen 15242, powdery materials with a particle size smaller than the filter holes 15243 pass through the filter holes and enter the internal space enclosed by the filter rotating assembly 15241 and the filter screen 15242—the powder separation chamber; larger light materials (such as plastic, paper, wood, foam, etc.) are blocked by the filter screen and remain in the light material separation chamber between the inner wall of the housing 1521 and the outer wall of the filter screen 15242. 2) Fin impact peeling: The fins 15244 arranged in a ring array on the filter rotating assembly 15241 rotate with the filter element and continuously impact the light material in the light material separation chamber; the impact of the fins 15244 shakes off the powder adhering to the surface of the light material, and the shaken-off powder passes through the filter screen 15242 and enters the powder separation chamber again. Step 44: The powdery material entering the powder separation chamber flows along the chamber to the dust outlet 1522 under negative pressure. The discharge port of the powder separation chamber is connected to the dust outlet 1522. The powdery material is discharged from the dust collector 151 through the dust outlet 1522. Step 45: The light material that is blocked in the light material separation chamber settles downward under the action of centrifugal force and gravity. The light material is finally discharged from the discharge port 1523 and enters the airlock 1527 below. The airlock 1527 rotates continuously, and its internal airlock core 1526 rotates under the drive of a motor. The blades of the airlock core 1526 convey the lightweight material to the lightweight material outlet 1525 for discharge. During the discharge process, the blades always block the vertical space of the airlock, and together with the tiny gap between the blade end face and the inner cavity wall, a dynamic air seal is formed to prevent external atmosphere from entering the housing 1521 in reverse, thus maintaining a stable negative pressure in the system. Step 46: During the operation of the dust collector 151, positive pressure gas is introduced into the sealed cavity 1513 through the atmospheric positive pressure inlet 1529. The positive pressure gas enters the sealed cavity 1513 formed by the first annular groove and the second annular groove from the atmospheric positive pressure inlet 1529, then passes through the inlet 1511 between the end face of the first annular plate 15245 and the inner wall of the shell 1521, and then through the inlet channel 1512 between the upper end face of the first annular plate 15245 and the inner wall of the shell 1521, and finally enters the light matter separation chamber and the powder separation chamber. This prevents light materials in the light matter separation chamber from entering the powder separation chamber through the sealed cavity 1513 under the action of pressure difference (e.g., light matter in the light matter separation chamber enters the powder separation chamber through the sealed cavity 1513). Figure 14 As shown in the figure, it achieves a contactless sealing effect; Step 47: The dust-laden gas (which has had its light materials removed and mainly contains fine particulate dust) discharged from the dust outlet 1522 of the light material separator 152 enters the air inlet 15115 of the dust collector 151; after entering, the dust-laden gas first encounters the airflow distribution plate 1514 (the airflow distribution plate 1514 may not be provided). Step 48: The uniformly distributed dust-laden gas enters the dust-laden chamber and flows from the outside to the inside of the filter cartridge 1517. The dust is intercepted on the outer surface of the filter cartridge 1517, and the clean gas passes through the filter cartridge 1517 into the interior of the filter cartridge 1517, and then rises through the round holes 1516 on the tube sheet 1515 into the clean air chamber; Step 49: The clean gas entering the clean air chamber is drawn in by the negative pressure fan 153. The negative pressure fan 153 discharges the purified gas from the device while continuously providing negative pressure to the entire system, forming a stable cycle; Step 410: As the filtration time increases, the dust layer adhering to the surface of filter cartridge 1517 gradually thickens, and the system resistance increases. When the resistance reaches the set value, the dust removal system starts the dust removal procedure: 1) The high-pressure compressed air stored in air tank 1519 is ready; 2) The pulse controller sends a signal, and the pulse valve opens instantaneously, using the electromagnetic pulse valve to release 0.3-0.6MPa compressed air instantaneously, forming a reverse shock wave; 3) Compressed air enters the blowpipe 1518 from the air tank 1519; 4) Compressed air is ejected at high speed from the nozzles 15110 on the blow pipe 1518, with each nozzle 15110 aligned with the center of a filter cartridge 1517; 5) The high-speed airflow enters the interior of the filter cartridge 1517, causing the filter cartridge 1517 to expand and deform instantly, shaking off the dust adhering to the outer surface of the filter cartridge 1517. 6) The stripped dust falls into the ash hopper 15111 below under the action of gravity; Step 411: The dust that falls into the ash hopper 15111 is temporarily stored in the ash hopper; Step 412: The above steps continue, with dust-laden gas continuously entering, lightweight materials continuously discharged from the lightweight material outlet 1525, and dust periodically discharged from the ash discharge valve 15112. The purified gas is continuously emitted, achieving efficient classification, separation, and purification of lightweight materials and dust in the dust-laden gas of construction waste.

[0050] In addition, such as Figures 17-18 As shown, unlike the structure of the dust collector 151 described above, the negative pressure fan 153 is installed in the internal cavity of the dust collector 151 and is located in the area where the clean air chamber of the light material separator 152 is located. It is used to directly extract clean gas from the clean air chamber and provide power for the entire device.

[0051] By integrating the negative pressure fan 153 into the clean air chamber of the lightweight material separator 152, the following beneficial effects are achieved: 1) Eliminate pipe resistance: The negative pressure fan 153 directly extracts clean gas from the clean air chamber without the need for external pipe connection, eliminating pipe friction loss and achieving a larger air volume under the same power, thus reducing system energy consumption. 2) Compact structure and space saving: The built-in negative pressure fan 153 makes the whole machine structure more compact, reduces the space occupied by external pipes, lowers the overall height and floor area, and makes it easy to integrate into mobile equipment or install in space-constrained places. 3) Reduced leakage risk: The flange connection point between the negative pressure fan 153 and the light material separator 152 is eliminated, which reduces the possibility of system leakage, ensures negative pressure stability, and improves dust removal efficiency. In this embodiment, the type of negative pressure fan 153 can be selected as a centrifugal fan or an axial fan according to the air volume and air pressure requirements. Its installation method can be horizontal or vertical to adapt to the spatial structure of the clean air chamber. During fan maintenance, it can be operated through the maintenance door opened on the lightweight material separator 152, making maintenance convenient.

[0052] The above steps are carried out continuously, with dust-laden materials constantly entering and powdery and lightweight materials being continuously discharged, achieving efficient classification and separation of powdery and lightweight materials in the dust-laden gas of construction waste.

[0053] Therefore, the entire machine adopts a three-in-one dust suppression system covering the "source-process-end" to ensure that dust accumulation meets standards: Source control: The plate chain machine 12 and the roller screen 13 form a closed space through the cover 11 and the first machine body. There are no other dust points except for the feed inlet, which reduces dust generation from the source and reduces the burden on the dust removal system. Process collection: The first dust removal system 15 is equipped with dual inlets at the feed chamber and the discharge chamber to accurately collect dust from key dust-generating points and prevent dust from spreading and affecting the operator's line of sight and equipment operation; the second dust removal system 24 is connected to the tension screen cover 23 through a dust suction pipe (not shown in some figures) to collect dust during the secondary screening process and ensure that each dust-generating point is effectively controlled. End-of-pipe purification: The dust removal system adopts a structure combining a dust collector 151 and a lightweight material separator 152. The collected dust-laden gas is efficiently purified and then stored on-site to ensure that the dust storage meets the standards, avoid work stoppages and rectifications due to environmental issues, and ensure the continuity and stability of the screening operation.

[0054] Among them, such as Figure 4 and Figure 8 As shown, the undersize material discharge conveyor 14, the large material discharge conveyor 18, the light material discharge conveyor 19, the medium material discharge conveyor 25, the small material discharge conveyor 26, and the powder material discharge conveyor 28 are all set up with hydraulic folding. The hydraulic system is centrally arranged, which facilitates daily maintenance and reduces maintenance workload, further improving the overall efficiency of screening operations. The whole machine uses hydraulic means to reduce the overall height, length, and width of the mobile roller screen 100 and the mobile tension screen 200 to meet the problem of long-distance transportation of the whole machine between project sites.

[0055] In addition, the whole machine also includes a central control vehicle 300, which provides unified control of the mobile roller screening machine 100 and the mobile tension screening machine 200, realizing real-time monitoring of the unit's operating status, parameter adjustment and fault warning. It adopts PLC integrated intelligent control and forms a wireless local area network to connect the control systems of each unit. The central control vehicle 300 is electrically connected to the first intelligent control cabinet 110 in the mobile roller screening machine 100 and the second intelligent control cabinet 214 in the mobile tension screening machine 200. The intelligent control cabinet can control the machine to work independently. The first intelligent control cabinet 110 and the second intelligent control cabinet 214 transmit the working status of the equipment through wireless signals. The central control vehicle 300 can be parked outside or next to the work site, away from the relatively harsh work site.

[0056] In addition, a remote control device is installed, which can remotely control the movement of the mobile roller screening machine 100 and the mobile tension screening machine 200, making operation more convenient, reducing personnel requirements, and improving overall work efficiency.

[0057] The central control vehicle 300 remotely controls the mobile roller screen 100 and the mobile tension screen 200, transmitting the real-time status (such as the amount of material stored) of the mobile roller screen 100 and the mobile tension screen 200 to the central control vehicle 300. Through real-time monitoring and remote control, it ensures that each piece of equipment is always in the best working condition, thereby improving production efficiency and equipment utilization.

[0058] Meanwhile, both the mobile roller screening machine 100 and the mobile tension screening machine 200 are equipped with battery packs, enabling them to move up and down transport vehicles under their own power.

[0059] When the machine moves short distances, it is powered by a battery pack (not shown in the diagram), abandoning the traditional diesel engine drive method. This is environmentally friendly and reduces carbon dioxide emissions; it also avoids the noise and exhaust pollution of diesel engines, improving the working environment. The battery pack only needs to meet the travel requirements within 2 kilometers, reducing battery capacity requirements and costs. During normal operation, the equipment operates on mains power, further reducing operating costs and environmental impact. This hybrid power mode of "mains power + battery" ensures the equipment's mobility while achieving low-carbon and environmentally friendly operation, reducing overall operating costs and improving economic efficiency.

[0060] Specifically: When using it, the vehicles transporting it to the site, such as Figure 4 and Figure 8 As shown, the entire machine is then driven to the designated working position via the battery pack; finally, the folded undersize material discharge conveyor 14, large material discharge conveyor 18, light material discharge conveyor 19, medium material discharge conveyor 25, small material discharge conveyor 26, and powder material discharge conveyor 28 are unfolded and fitted with a sunshade awning 182, as shown. Figure 1 and 6 As shown.

[0061] like Figure 6 As shown, according to the material characteristics and screening requirements, the tilting device 29 is activated to raise the feed end of the double-layer tension screen 22 to a height higher than the discharge end, forming the required screen surface tilt angle; and the auxiliary limiting component 212 is opened to provide auxiliary support, ensuring the stability and safety of the tilt angle adjustment, so that the material can obtain the best flow speed on the screen surface—increasing the tilt angle can increase the throughput, and decreasing the tilt angle can improve the screening accuracy; the auxiliary limiting component 212 is opened to support the frame.

[0062] A method for using a combined mobile screening device, wherein the screening operation is performed using any of the combined mobile screening devices described above, and the specific steps are as follows: Step 1: Feeding process: Feeding material into the plate chain conveyor 12 of the mobile roller screen 100 by excavator or other device, the plate chain conveyor 12 carries and receives the material; Step 2: Primary screening process: Start the plate chain conveyor 12 to convey the material. The material is conveyed to the end of the plate chain conveyor 12 and falls onto the roller screen 13. Each roller of the drive roller screen 13 rotates clockwise, and the material is screened in the gap between the rollers. The undersize material with a particle size smaller than the gap between the rollers falls from the gap between the rollers to the undersize material discharge conveyor 14, while the material with a particle size larger than the gap between the rollers is continued to be conveyed to the output end of the roller screen 13 by the rollers. Step 3: Air separation and sorting process: Materials larger than the roller gap conveyed by roller screen 13 fall downwards. During the falling process, air separator 17 is started. The air outlet of air separator 17 is directly facing the large material discharge chamber, blowing the light materials in the material onto the light material discharge conveyor 19. The remaining large materials (such as plastic buckets, large bricks, etc.) fall onto the large material discharge conveyor 18. Meanwhile, at the manual sorting stations 181 on both sides of the large material discharge conveyor 18, impurities in the large material (other impurities in the large material (such as wood blocks, hard plastics, etc., which are inconsistent with the type and recycling purpose of bricks and cement blocks) are manually sorted and protected by the sunshade awning 182. Step 4: First Dust Removal Process: Synchronous with the above steps, the first dust removal system 15 is started. The first dust removal system 15 collects and processes the dust at the feed inlet and the discharge outlet of the bulk material. Specifically, the first dust removal system 15 remains running throughout the entire screening process. After initial separation by the dust collector 151, the dust-laden gas enters the lightweight material separator 152 for secondary separation: During the rotation of the filter element 1524, the fins 15244 impact the lightweight material, causing the powder to separate from the lightweight material. The powder is discharged and recycled through the dust outlet 1522, while the lightweight material falls into the airlock 1527 through the discharge port 1523, where it is discharged and the reverse entry of atmospheric air is prevented, ensuring stable negative pressure in the dust removal system. Step 5: Secondary screening process: The undersize material discharge conveyor 14 transports the undersize material to the double-layer tension screen 22 of the mobile tension screen 200 for secondary screening. The aperture sizes of the two tension screens are different. The double-layer tension screens can be replaced with the appropriate aperture size as needed. After screening, the material is divided into medium material, small material and powder. Among them, the medium material on the upper tension screen of the double-layer tension screen 22 is conveyed to the medium material discharge conveyor 25 and output; Small materials on the lower tension screen of the double-layer tension screen 22 are conveyed to the small material discharge conveyor 26 and output; The powder falls onto the powder transfer conveyor 27, is transferred to the powder discharge conveyor 28 and output; thus completing the grading and screening. Specifically: First, the undersize material (particle size 0-30mm) after pretreatment by the mobile roller screen 100 is fed into the feed port on the tension screen cover 23 and falls onto the upper tension screen surface of the double-layer tension screen 22. Secondly, the double-layer tension screen 22 is activated, with the upper and lower tension screens undergoing high-frequency tensioning motion (approximately 800 times per minute). The material is first screened on the upper tension screen: Materials with a particle size larger than the aperture of the upper tension screen (medium material, such as 10-30mm) cannot pass through the screen holes. Under the conveying action of the high-frequency tension motion of the screen surface, they move forward and are eventually discharged from the upper discharge end and fall into the medium material discharge conveyor 25. Materials with a particle size smaller than the aperture of the upper screen (including small materials and powders) pass through the upper tension screen and fall onto the surface of the lower tension screen. The material falling into the lower layer of the tension screen continues to undergo fine screening: Materials with a particle size larger than the aperture of the lower tension screen (small materials, such as 5-10mm) cannot pass through the screen holes. Under the conveying action of the high-frequency tensioning motion of the lower tension screen surface, they move forward and are eventually discharged from the lower discharge end and fall into the small material discharge conveyor 26. Materials with a particle size smaller than the aperture of the lower screen (powder, 0-5mm) pass through the lower screen and continue to fall downwards; The powder falling through the lower tension screen falls onto the powder transfer conveyor 27, which transfers the powder to the powder discharge conveyor 28, which then transports it to a designated location or downstream equipment. Step 6: Second Dust Removal Process: Synchronous with the above steps, the second dust removal system 24 is started. The second dust removal system 24 is connected to the feed chamber and the discharge chamber through a dust suction pipe, continuously collecting the dust generated during the screening process. The second dust removal system 24 collects and processes the dust inside the tension screen cover 23. Specifically, the second dust removal system 24 remains running throughout the entire screening operation. The second dust removal system 24 is connected to the tension screen cover 23 through a dust suction pipe, continuously collecting the dust generated during the screening process.

[0063] Example 2: The difference from Example 1 is as follows: Figure 19 As shown, it also includes a feed conveyor 213, one end of which is connected to the feed inlet of the tension screen cover 23 of the mobile tension screen 200, and the other end of which is connected to the undersize discharge conveyor 14 of the mobile roller screen 100.

[0064] By setting up an independent feed conveyor 213, a flexible connection is achieved between the mobile roller screen 100 and the mobile tension screen 200. The two machines can be flexibly arranged according to the site terrain conditions without strict alignment, reducing the difficulty of site layout. At the same time, the feed conveyor 213, as an independent buffer conveying unit, can adjust the material conveying speed to avoid material accumulation at the tension screen inlet, ensuring the continuous and stable operation of the secondary screening process.

[0065] Example 3: The difference from Example 1 is as follows: Figure 20 As shown, it also includes at least one mobile belt conveyor 400. The mobile belt conveyor 400 is independently installed outside the mobile roller screen 100 and / or the mobile tension screen 200. The mobile belt conveyor 400 is installed at the discharge end of at least one of the undersize material discharge conveyor 14, the large material discharge conveyor 18, the light material discharge conveyor 19, the medium material discharge conveyor 25, the small material discharge conveyor 26, and the powder material discharge conveyor 28. It is used to transfer the material output by the corresponding conveyor to a designated location or downstream equipment. The mobile belt conveyor 400 can be selected and used according to the actual site conditions.

[0066] Specifically: When it is necessary to transport the screened material to a distant location or downstream equipment, a mobile belt conveyor 400 is installed at the discharge end of the screened material discharge conveyor 14. The screened material is transferred to a distant location or downstream equipment through the mobile belt conveyor 400 to achieve long-distance transportation.

[0067] When it is necessary to transport large materials, light materials, medium materials, small materials, and powder materials to designated stockpiling areas or transport vehicles, mobile belt conveyors 400 can be installed at the discharge ends of the large material discharge conveyor 18, light material discharge conveyor 19, medium material discharge conveyor 25, small material discharge conveyor 26, and / or powder material discharge conveyor 28, respectively, and the materials can be transported to the designated location by the mobile belt conveyors 400.

[0068] The 400 mobile belt conveyor can be flexibly configured according to the actual needs of the site. It can be installed at one of the discharge ends or at multiple discharge ends at the same time to adapt to different site and process requirements.

[0069] The tilt angle of the mobile belt conveyor 400 is adjustable to adapt to different site conditions and docking heights and conveying distances with downstream equipment.

[0070] The mobile belt conveyor 400 can be fitted with casters at the bottom of its frame, allowing for flexible adjustment of its position and angle on-site. The conveyor belt width and conveying speed of the mobile belt conveyor 400 are matched to the corresponding discharge conveyor to ensure smooth material transport and prevent blockages.

[0071] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A combined mobile screening device, characterized in that: include: Mobile roller screening machine (100). The mobile tension screening machine (200), the mobile roller screening machine (100) and the mobile tension screening machine (200) are separate structures, and the mobile roller screening machine (100) and the mobile tension screening machine (200) are arranged in series. The output end of the mobile roller screen (100) is connected to the input end of the mobile tension screen (200) so that part of the material processed by the mobile roller screen (100) is transported to the mobile tension screen (200) for further grading and screening.

2. The combined mobile screening device according to claim 1, characterized in that: The mobile roller screening machine (100) includes: First mobile chassis (16); The first body is mounted on the first mobile chassis (16), on which the first intelligent control cabinet (110) and battery pack are installed; The cover (11) is located at both ends of the first body and forms a shell cavity inside after being assembled with the body; A plate chain conveyor (12) is installed on the first machine body to carry the material fed by the excavator and transport the material. The roller screen (13) is used to receive and screen the material on the plate chain machine (12). It is set directly below the plate chain machine (12) and is stacked with the plate chain machine (12). The discharge end of the plate chain machine (12) is directly opposite the feed end of the roller screen (13) so that the material falls from the plate chain machine (12) onto the roller screen (13). There is a gap between the cover (11) and the plate chain machine (12), which forms the feed cavity. There is a gap between the cover (11) and the roller screen (13), which forms the discharge cavity. The undersize discharge conveyor (14) is located below the roller screen (13) and is used to transport the material screened by the roller screen (13) to the mobile tension screen (200). The first dust removal system (15) is installed on the first body. One end of the first dust removal system (15) is located at the feed chamber, and the other end of the first dust removal system (15) is located at the discharge chamber. It is used to collect and treat the dust at the feed chamber and the discharge chamber. The large material discharge conveyor (18) is located at the output end of the roller screen (13) and is used to receive and transport large-sized materials; The air separator (17) is installed on the first body, with its air outlet facing the material discharge chamber, and is used to separate light materials from the material. Lightweight material discharge conveyor (19) is installed on the first body and is located close to the large material discharge conveyor (18) for conveying lightweight materials after air separation.

3. The combined mobile screening device according to claim 2, characterized in that: The roller screen (13) includes: Multiple rollers (131) are arranged side by side; Several sieve discs (132) are arranged on each roller (131) along the axial direction, and the corresponding sieve discs (132) on each roller (131) are all on the same straight line. A roller gap is formed between adjacent sieve discs (132) on two adjacent rollers (131), and the shape of the roller gap is square.

4. The combined mobile screening device according to claim 1, characterized in that: The mobile tension screening machine (200) includes: Second mobile chassis (21); The second body is mounted on the second mobile chassis (21), on which the second intelligent control cabinet (214) and battery pack are installed; A double-layer tension screen (22) is set on the second body to receive and screen the undersize material conveyed by the mobile roller screen (100), and is divided into an upper tension screen and a lower tension screen. The tension screen cover (23) is installed on the outside of the double-layer tension screen (22), and a feed inlet is provided on it to connect with the undersize discharge conveyor (14) of the mobile roller screen (100). The second dust removal system (24) is installed on the second body. The second dust removal system (24) is connected to the tension screen cover (23) through a dust suction pipe to collect and process the dust inside the tension screen cover (23). The intermediate material discharge conveyor (25) is installed at the discharge end of the upper tension screen of the double-layer tension screen (22) to receive and transport the screened intermediate material; The small material discharge conveyor (26) is installed at the discharge end of the lower layer of the double-layer tension screen (22) to receive and transport the small materials after screening. The powder transfer conveyor (27) is installed below the double-layer tension screen (22) and is used to receive and transfer the powder after screening by the lower tension screen of the double-layer tension screen (22). The powder discharge conveyor (28) works in conjunction with the powder transfer conveyor (27) to transport powder.

5. A combined mobile screening device according to claim 4, characterized in that: The second body is also equipped with a feeding conveyor (213), one end of which is connected to the feed inlet of the tension screen cover (23), and the other end of which is connected to the undersize discharge conveyor (14) of the mobile roller screen (100).

6. The combined mobile screening device according to claim 1, characterized in that: The first dust removal system (15) in the mobile roller screen (100) and the second dust removal system (24) in the mobile tension screen (200) both include: A dust collector (151) is used to separate dust from gas after it has been treated by a light material separator (152); A negative pressure fan (153) is installed at the outlet of the dust collector (151) to provide power for the entire device; A lightweight material separator (152) is installed at the feed end of the dust collector (151). The light material separator (152) includes: The shell (1521) has an internal cavity; The filter element (1524) is rotatably mounted laterally in the receiving cavity of the housing (1521) for separating the powdery material from the light material during rotation; The material inlet (1530) is located on the upper side wall of the shell (1521) and is used for feeding materials; The dust outlet (1522) is located on one side of the housing (1521), and the other side of the housing (1521) opposite to the dust outlet (1522) is a closed surface; The discharge port (1523) is located at the lower end of the shell (1521) and is used to discharge the separated light material; The air shut-off fan (1527) is located below the housing (1521). Lightweight materials are discharged by rotating the air shut-off fan core (1526) in the air shut-off fan (1527) and the atmosphere is blocked from entering the housing (1521) in the opposite direction. A lightweight material discharge port (1525) is provided below the air shut-off fan (1527).

7. A combined mobile screening device according to claim 6, characterized in that: The dust collector (151) includes: Separate the body (15114), which forms a hollow inner cavity; The tube sheet (1515) is horizontally installed in the inner cavity of the separator (15114), dividing the inner cavity of the separator (15114) into a lower dust-containing chamber and an upper clean air chamber; several round holes (1516) are opened on the surface of the tube sheet (1515). Several filter cartridges (1517) are installed below a corresponding circular hole (1516) and suspended in the dust-containing chamber; An air inlet (15115) is located on the side wall of the separator body (15114) and is connected to the air outlet of the light material separator (152). The air inlet (15115) is located in the area corresponding to the dust-containing chamber. An air outlet (15113) is located on the side wall of the separator (15114) and is connected to the air inlet of the negative pressure fan (153). The air outlet (15113) is located in the area corresponding to the clean air chamber. The ash hopper (15111) is installed below the separator (15114) to collect the dust after it has been stripped by the filter cartridge (1517). An ash discharge valve (15112) is installed at the outlet of the ash hopper (15111).

8. A combined mobile screening device according to claim 1, characterized in that: It also includes a central control vehicle (300), which is electrically connected to the first intelligent control cabinet (110) in the mobile roller screening machine (100) and the second intelligent control cabinet (214) in the mobile tension screening machine (200).

9. A combined mobile screening device according to claim 1, characterized in that: It also includes at least one mobile belt conveyor (400), which is installed at the discharge end of at least one of the following in the mobile roller screen (100): undersize discharge conveyor (14), large material discharge conveyor (18), and light material discharge conveyor (19), and the mobile tension screen (200): medium material discharge conveyor (25), small material discharge conveyor (26), and powder material discharge conveyor (28), for transferring the material output by the corresponding conveyor to a designated location or downstream equipment; The undersize material discharge conveyor (14), large material discharge conveyor (18), and light material discharge conveyor (19) in the mobile roller screen (100) and the medium material discharge conveyor (25), small material discharge conveyor (26), and powder material discharge conveyor (28) in the mobile tension screen (200) are all set up in a hydraulic folding manner.

10. A method of using a combined mobile screening device, characterized in that: The screening operation is carried out using a combined mobile screening device as described in any one of claims 1 to 9, and the specific steps are as follows: Step 1: Feeding process: Feeding material into the plate chain conveyor (12) of the mobile roller screen (100) by excavator or other device, the plate chain conveyor (12) carries and receives the material; Step 2: Primary screening process: Start the plate chain machine (12) to convey the material. The material is conveyed to the end of the plate chain machine (12) and falls onto the roller screen (13); Each roller of the drive roller screen (13) rotates clockwise, and the material is screened in the gap between the rollers. The undersize material with a particle size smaller than the gap between the rollers falls from the gap between the rollers to the undersize material discharge conveyor (14), while the material with a particle size larger than the gap between the rollers is continued to be conveyed to the output end of the roller screen (13) by the rollers. Step 3: Air separation and sorting process: The material that is larger than the gap between the rollers conveyed by the roller screen (13) falls downward. During the falling process, the air separator (17) is started. The air outlet of the air separator (17) is directly facing the large material discharge chamber. The light material in the material is blown down to the light material discharge conveyor (19), and the remaining large material falls to the large material discharge conveyor (18). Meanwhile, large-sized materials are manually sorted at the manual sorting stations (181) on both sides of the large material discharge conveyor (18), and are protected by sunshade canopy (182). Step 4: First dust removal process: In sync with the above steps, start the first dust removal system (15). The first dust removal system (15) collects and processes the dust at the feed inlet and the discharge outlet of the bulk material. Step 5: Secondary screening process: The undersize material discharge conveyor (14) transports the undersize material to the double-layer tension screen (22) of the mobile tension screen (200) for secondary screening. After screening, it is divided into medium material, small material and powder. Among them, the medium material on the upper tension screen of the double-layer tension screen (22) is conveyed to the medium material discharge conveyor (25) and output; Small materials on the lower tension screen of the double-layer tension screen (22) are conveyed to the small material discharge conveyor (26) and output; The powder falls onto the powder transfer conveyor (27), is transferred to the powder discharge conveyor (28) and output; thus completing the grading and screening. Step 6: Second dust removal process: In sync with the above steps, start the second dust removal system (24), which collects and processes the dust inside the tension screen cover (23).

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