Screening machine for recycling construction waste

Abstract

The application provides a screening machine for recycling and processing construction waste, and relates to the technical field of construction waste screening. The screening machine comprises a vibrating screen and a layer of screen mesh. The layer of screen mesh comprises a frame, a screen mesh one and a screen mesh two arranged in the frame, a connecting piece connected between the screen mesh one and the screen mesh two, the screen mesh one located above the screen mesh two, and the inclination of the screen mesh one relative to the horizontal plane smaller than the inclination of the screen mesh two relative to the horizontal plane. The screen mesh one and the screen mesh two each comprise a plurality of spiral shafts rotatably connected to the frame and spiral blades arranged on the spiral shafts. The spiral blades are provided with convex edges, and the plurality of spiral shafts are driven by a driving assembly. The layer of screen mesh is designed in a stepped manner. After the construction waste is vibrated and screened on the screen mesh one, the construction waste falls onto the screen mesh two along the screen mesh one. In addition, the spiral blades are in contact with the gravel plates, the convex edges increase the friction between the gravel plates and the spiral blades, which is beneficial to the overturning of the gravel plates and the reduction of the soil retained on the surface of the gravel plates.

Description

Technical Field

[0001] This invention relates to the field of construction waste screening technology, and specifically to a screening machine for construction waste recycling and processing. Background Technology

[0002] Construction waste refers to various wastes generated during construction, demolition, or repair, including construction debris, mud, construction waste, demolition waste, and renovation waste, encompassing concrete blocks, brick and tile fragments, waste mortar, and scrap metal. Recycling and reusing construction waste can reduce damage to the natural environment and ecological impact, while also reducing the demand for raw materials and conserving resources. Among construction waste, discarded bricks and tiles can be directly used as backfill material or roadbed filler, and concrete blocks can be crushed to produce recycled aggregate, replacing natural sand and gravel in the production of new concrete or mortar.

[0003] When recycling construction waste, it is generally necessary to first sort and pre-process the construction waste, and then crush it. The crushed construction waste will be screened by a vibrating screen to separate materials of different particle sizes.

[0004] For example, patent document CN208482784U discloses a centralized vibrating screening device for construction waste. This screening device has three screens, with the aperture sizes of the first, second, and third screens decreasing sequentially to facilitate the screening of construction waste of different sizes. The screened construction waste is then sorted and processed by discharging the waste from the first, second, and third hoppers in the front, right, and left directions, respectively.

[0005] For example, patent document CN112845093B discloses a multi-stage screening device for building aggregates. This screening device includes a conveying mechanism, a screening mechanism, and a fine screening mechanism. The aggregates to be screened are conveyed to the first screen of the screening mechanism by the conveying mechanism. The coarser aggregates remain on the first screen. Subsequently, the aggregates to be screened are continuously placed on a conveyor belt. The rotation of the conveyor belt and the continuous up-and-down swinging of the first screen cause the finer aggregates to fall through the first screen onto the second screen of the fine screening mechanism, thus performing a secondary screening of the aggregates.

[0006] Construction waste may contain concrete fragments, crushed stone slabs, and soil, and the size of the crushed stone slabs differs from that of the concrete fragments. When the vibrating screen equipment described above is screening construction waste, when larger crushed stone slabs enter the screen, they tend to lie flat on the screen and cannot be effectively turned over. This causes soil on the surface of the crushed stone slabs to easily remain on the slabs and not easily separated by the screen, thus affecting the screening effect of the crushed stone slabs and soil. Summary of the Invention

[0007] In view of this, the present invention provides a screening machine for recycling and processing construction waste, which solves the technical problem in the prior art that soil on the crushed stone slabs is easily retained on the crushed stone slabs when they are laid flat on the screen, thus affecting the screening effect of crushed stone slabs and soil.

[0008] To solve the above technical problems, the present invention provides a screening machine for recycling and processing construction waste, including a vibrating screen and a layer of screens arranged above the vibrating screen. The layer of screens includes a frame, a first screen and a second screen arranged in the frame, and a connecting member connecting the first screen and the second screen. The first screen is located above the second screen, and the inclination of the first screen relative to the horizontal plane is less than the inclination of the second screen relative to the horizontal plane.

[0009] Both screen one and screen two include multiple spiral shafts rotatably connected to the frame and spiral blades arranged on the spiral shafts. The spiral blades are provided with protruding ridges, and the multiple spiral shafts are driven by a drive assembly.

[0010] By adopting the above technical solution, the construction waste to be screened is conveyed onto screen one. The drive component drives the spiral shaft to rotate, and the spiral shaft drives the spiral blades to rotate. While the spiral blades are rotating, they intermittently contact the construction waste, causing the construction waste to vibrate, which is beneficial to the screening of the construction waste. After being vibrated and screened on screen one, the construction waste falls onto screen two. The inclination of screen two is greater than that of screen one, which helps to increase the inclination angle of the crushed stone slabs laid flat on screen one when they fall onto screen two. In addition, the contact between the spiral blades and the crushed stone slabs, and the convex edges increase the friction between the crushed stone slabs and the spiral blades, which is conducive to the flipping of the crushed stone slabs and reduces the soil remaining on the surface of the crushed stone slabs, thereby improving the screening effect of crushed stone slabs and soil.

[0011] Construction waste is sieved through a stepped arrangement of screens one and two. Under the influence of gravity, the waste first passes through screen one with a gentler inclination, then enters screen two with a more pronounced inclination, achieving graded screening. The slower movement of the waste on screen one prolongs the screening time, which is beneficial for separating large pieces of gravel, concrete fragments, etc., from the soil. Simultaneously, this reduces the impact of the waste falling onto screen two. Furthermore, the raised edges increase friction between the gravel and the spiral blades, further reducing the impact on screen two and thus minimizing wear.

[0012] Because of the larger inclination of the second screen, the construction waste moves faster on the second screen, which reduces the time the construction waste stays on the second screen and helps to improve screening efficiency.

[0013] Preferably, the vibrating screen has a frame, with a frame body slidably connected to the frame. A drive motor is installed on the frame, and the drive motor drives the frame body to reciprocate through a crank-connecting rod mechanism.

[0014] By adopting the above technical solution, the frame can slide relative to the machine frame. The drive motor converts the rotational motion into the reciprocating linear motion of the frame through the crank-connecting rod mechanism, which in turn drives the screens one and two to reciprocate linearly. At the same time, the rotation of the spiral shaft and spiral blades causes the construction waste to vibrate on the screens one and two. The combination of the two is conducive to the rapid dispersion of construction waste on the screen, reducing the local accumulation of construction waste on the screen, and improving the effective area utilization rate of the screen, thereby improving the screening efficiency.

[0015] Furthermore, vibration causes construction waste to bounce on screens one and two, reducing the risk of clogging; reciprocating sliding increases the contact between construction waste and the screen openings, facilitating the smooth passage of small particles through screens one or two, further reducing clogging and thus improving screening efficiency. Compared to simply increasing vibration intensity, this combined motion achieves better results with lower energy consumption, reduces equipment load, and ensures smoother operation.

[0016] Preferably, the connector is Z-shaped, and the frame is provided with support rod one and support rod two. Support rod one is located above support rod two. The spiral shaft of screen one is rotatably connected to support rod one, and the spiral shaft of screen two is rotatably connected to support rod two. The two ends of the connector are respectively connected to support rod one and support rod two.

[0017] By adopting the above technical solution, support rod one is located above support rod two, supporting the spiral shafts of screen one and screen two respectively, forming two independent and stable support structures. The upper and lower spiral shafts rotate independently, reducing inter-shaft interference caused by vibration or impact from construction waste, and improving operational stability. The two ends of the Z-shaped connector are connected to support rod one and support rod two respectively, forming a rigid frame structure, enhancing the overall torsional and bending resistance, and adapting to high-load screening operations.

[0018] Preferably, both sides of the frame are equipped with baffles that can block construction waste from the first layer of screen.

[0019] By adopting the above technical solution, construction waste may splash or spill from the edge of a screen during the vibrating screening process. The baffle can limit the movement range of construction waste in the width direction of the screen surface, keeping the construction waste within the screening area. This helps to reduce the amount of construction waste spilling outside the equipment or entering the non-working area inside the equipment, reducing the waste of construction waste and the injury to operators caused by the splashing of construction waste, while also reducing the amount of cleaning work.

[0020] Preferably, each of the two baffles has a guide plate on its opposite side. The guide plate includes a first plate and a second plate connected to the lower end of the first plate. The inclination of the first plate relative to the horizontal plane is less than the inclination of the second plate relative to the horizontal plane.

[0021] By adopting the above technical solution, when construction waste splashes from the screen surface to the baffle, it first contacts plate one with a smaller inclination. Its gentle slope slows the falling speed of the construction waste, preventing direct impact or rebound and reducing the risk of secondary splashing. After being buffered by plate one, the construction waste slides quickly along plate two onto screen one or screen two. The large inclination design accelerates the fall of the construction waste, improving screening efficiency. The guide plate, through the combination of plates one and two, forms a "buffering-acceleration" guiding path, effectively reducing the amount of construction waste spilling from the top or edge of the baffle to the outside of the equipment, thus reducing waste.

[0022] Preferably, the frame is provided with a slide rail, a slider is on the slide rail, a support column is connected to the slider, and the support column is connected to the frame.

[0023] By adopting the above technical solution, the cooperation of the slide rail and the slider allows the support column and the frame connected to it to slide freely in the direction of the slide rail, thereby enabling screen one and screen two to slide synchronously. Drive motor one drives the frame to reciprocate along the slide rail via a crank-connecting rod mechanism, which in turn drives screen one and screen two to reciprocate. This facilitates the rapid dispersion of construction waste on screen one, reduces localized accumulation of construction waste on screen one, improves the effective area utilization rate of screen one, and increases the contact opportunity between construction waste and the screen holes. This allows small particles of construction waste to pass smoothly through screen one or screen two, reducing clogging of the screen holes and thus improving screening efficiency.

[0024] Preferably, the two ends of the support column are connected to the frame, and the end face of the support column near the spiral shaft is an upwardly convex arc shape.

[0025] By adopting the above technical solution, the support column is located below screen one and screen two. When construction waste falls through screen one or screen two, the arc-shaped structure guides the waste to slide naturally along its curved shape, reducing the accumulation of construction waste on the end face of the support column. This allows the construction waste to fall more smoothly onto the vibrating screen located below screen one and screen two for further screening. In addition, the falling construction waste will generate impact force on the support column. The arc-shaped end face can distribute this impact force more evenly to various parts of the support column, thereby improving the load-bearing capacity and service life of the support column.

[0026] Preferably, the vibrating screen includes two screens, which are located below the first screen. The second screen has a discharge chute at one end and the second screen has a discharge chute at the other end.

[0027] By adopting the above technical solution, the double-layer screen design allows construction waste to undergo two screening processes with different specifications. The first screen performs preliminary screening of the construction waste, separating larger particles; the second screen further refines the waste that passed through the first screen, separating medium and fine particles. Discharge trough one and discharge trough two collect construction waste of different particle sizes respectively, facilitating the classification, collection, and storage of construction waste at each level. Construction waste of different particle sizes can be further processed according to their intended use, improving the efficiency of construction waste recycling.

[0028] Preferably, a feed trough is provided at the end of screen one that is away from screen two, and a mounting plate one is installed below the feed trough. The spiral shaft on screen one is rotatably connected to the mounting plate one. A mounting plate two is installed below the discharge trough one, and the spiral shaft on screen two is rotatably connected to the mounting plate two.

[0029] By adopting the above technical solution, the two ends of the spiral shaft on screen one are rotatably connected to mounting plate one and support rod one, respectively, and the two ends of the spiral shaft on screen two are rotatably connected to mounting plate two and support rod two, respectively. The drive assembly drives the spiral shaft to rotate, thereby driving the spiral blades to rotate, so as to realize the screening of construction waste.

[0030] Preferably, the drive assembly includes a second drive motor mounted on the frame and a transmission chain connecting the output shaft of the second drive motor and the helical shaft.

[0031] By adopting the above technical solution, the second drive motor drives the spiral shaft to rotate through the transmission chain, which in turn drives the spiral blades to rotate, thereby realizing the screening of construction waste.

[0032] The beneficial effects of the above-described technical solution of the present invention are as follows:

[0033] 1. The first layer of the screen of the present invention adopts a stepped design. After the construction waste is vibrated and screened on the first screen, it falls onto the second screen along the first screen. The inclination of the second screen is greater than that of the first screen. This helps to increase the inclination angle of the crushed stone slabs laid flat on the first screen when they fall onto the second screen. In addition, the contact between the spiral blades and the crushed stone slabs and the convex edges increase the friction between the crushed stone slabs and the spiral blades, which is conducive to the flipping of the crushed stone slabs and reduces the soil stuck on the surface of the crushed stone slabs. This is conducive to improving the screening effect of crushed stone slabs and soil.

[0034] 2. The drive motor drives screen one and screen two to reciprocate linear motion through the crank-connecting rod mechanism. At the same time, the rotation of the spiral shaft and spiral blades causes the construction waste to vibrate on screen one and screen two. The combination of the two is conducive to the rapid dispersion of construction waste on screen one, reducing the local accumulation of construction waste on screen one, which is conducive to improving the effective area utilization rate of screen one, thereby improving the screening efficiency.

[0035] 3. The present invention has baffles on both sides of the frame. The baffles can limit the movement range of construction waste in the width direction of the screen surface, so that the construction waste is kept in the screening area. This helps to reduce the amount of construction waste spilled outside the equipment or into the non-working area inside the equipment, reduce the waste of construction waste and the injury to operators caused by the splashing of construction waste, and at the same time reduce the amount of cleaning work. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the screening machine for recycling and processing construction waste according to the present invention;

[0037] Figure 2 This is a cross-sectional view of the screening machine for recycling and processing construction waste according to the present invention;

[0038] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0039] Figure 4 This is a schematic diagram of the structure of the helical shaft of the present invention;

[0040] Figure 5 This is a cross-sectional view of one layer of the screen of the present invention;

[0041] Figure 6 This is a top view of one layer of the screen of the present invention;

[0042] Figure 7 This is a partial structural diagram of the driving component driving the spiral shaft of the present invention;

[0043] Figure 8 This is a schematic diagram of the structure of the drive motor and the drive frame of the present invention.

[0044] In the diagram: 1. Vibrating screen; 11. Frame; 12. Second-layer screen; 121. Discharge chute 2; 13. Slide rail; 14. Slider; 15. Drive motor 1; 16. Crank-connecting rod mechanism; 17. Support column; 18. Baffle; 19. Guide plate; 191. Plate 1; 192. Plate 2; 2. First-layer screen; 21. Frame; 211. Feed chute; 212. Discharge chute 1; 213. Support rod 1; 214. Support rod 2; 215. Mounting plate 1; 216. Mounting plate 2; 22. Screen 1; 23. Screen 2; 231. Spiral shaft; 232. Spiral blade; 233. Protruding rib; 24. Connector; 3. Drive assembly; 31. Drive motor 2; 32. Transmission chain; 33. Gear 1; 34. Gear 2. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the embodiments of the present invention. Figures 1-8The technical solutions of the embodiments of the present invention will be clearly and completely described.

[0046] Example

[0047] This embodiment provides a screening machine for the recycling and processing of construction waste, such as... Figure 1 As shown, it includes a vibrating screen 1 and a layer of screen 2 disposed above the vibrating screen 1.

[0048] like Figure 1 As shown, the vibrating screen 1 is a commonly used linear vibrating screen 1 on the market, and its structure will not be described in detail. The vibrating screen 1 has a frame 11 and two layers of screens 12, with the two layers of screens 12 located below the first layer of screens 2.

[0049] like Figure 1 As shown, the first layer of screen 2 includes a frame 21, a first screen 22 and a second screen 23 disposed within the frame 21.

[0050] like Figure 1 As shown, the frame 21 is slidably mounted on the frame 11. One end of the frame 21 is provided with a feed chute 211, and the other end is provided with a discharge chute 212. The frame 21 gradually slopes downward from the end near the feed chute 211 to the end near the discharge chute 212.

[0051] like Figure 1 As shown, screen 1 22 is connected to the feed inlet 211, and screen 2 23 is connected to the discharge outlet 212. Screen 1 22 is located above screen 2 23, and there is a gap between screen 1 22 and screen 2 23. The end of the two screens 12 is provided with discharge outlet 2 121.

[0052] like Figure 1 As shown, the double-layer screen design allows construction waste to undergo two screening processes with different specifications. The first screen 2 first performs preliminary screening of the construction waste, separating out larger particles; the second screen 12 then performs further fine screening of the construction waste that has passed through the first screen 2, separating out medium and fine particles.

[0053] like Figure 1 As shown, construction waste on the first layer of screen 2 is discharged through discharge chute 1 212, and construction waste on the second layer of screen 12 is discharged through discharge chute 2 121, which facilitates the classification, collection and storage of construction waste at all levels.

[0054] like Figure 2 and Figure 3 As shown, there is a Z-shaped connector 24 connecting screen 1 22 and screen 23. The inclination of screen 1 22 relative to the horizontal plane is less than that of screen 23 relative to the horizontal plane, that is, screen 23 is steeper than screen 1 22.

[0055] like Figure 2 and Figure 3 As shown, the middle part of the frame 21 is provided with support rod 1 213 and support rod 214. Support rod 1 213 is located above support rod 214. The upper end of connector 24 is connected to support rod 1 213, and the lower end of connector 24 is connected to support rod 214.

[0056] like Figure 1 and Figure 2 As shown, construction waste is vibrated and screened on screen 1 22 and then falls onto screen 23. The inclination of screen 23 is greater than that of screen 1 22, which helps to increase the angle of inclination of the crushed stone slabs laid on screen 1 22 when they fall onto screen 23. This facilitates the turning of the crushed stone slabs, reduces the amount of soil remaining on the surface of the crushed stone slabs, and thus improves the screening effect between the crushed stone slabs and the soil.

[0057] like Figure 1 and Figure 2 As shown, construction waste is arranged in a stepped manner using screens 22 and 23. Under the influence of gravity, the construction waste first passes through screen 22 with a relatively small inclination, and then enters screen 23 with a larger inclination, achieving graded screening. The construction waste moves slowly on screen 22, extending the screening time, which is beneficial for separating large pieces of crushed stone, concrete fragments, etc., from the soil. Simultaneously, it helps reduce the impact of construction waste falling onto screen 23. Due to the larger inclination of screen 23, the construction waste moves faster on screen 23, reducing the time the construction waste remains on screen 23 and contributing to improved screening efficiency.

[0058] like Figure 3 and Figure 4 As shown, both screen 1 22 and screen 2 23 include multiple spiral shafts 231 rotatably connected to the frame 21 and spiral blades 232 disposed on the spiral shafts 231. The multiple spiral shafts 231 are arranged in parallel, and the spiral blades 232 are provided with protruding ridges 233. The upward-facing section of the spiral blades 232 is designed to be non-arc. The multiple spiral shafts 231 are driven by the drive assembly 3.

[0059] like Figure 2 and Figure 3 As shown, an installation plate 215 is installed below the feed trough 211, and the two ends of the spiral shaft 231 on the screen 22 are rotatably connected to the installation plate 215 and the support rod 213, respectively.

[0060] like Figure 2 and Figure 3 As shown, a mounting plate 216 is installed below the discharge trough 212, and the two ends of the spiral shaft 231 on the screen 23 are rotatably connected to the mounting plate 216 and the support rod 214, respectively.

[0061] like Figure 1 and Figure 3 As shown, the construction waste to be screened is conveyed onto screen 22. The drive assembly 3 drives the spiral shaft 231 to rotate, and the spiral shaft 231 drives the spiral blades 232 to rotate. While the spiral blades 232 are rotating, they are in intermittent contact with the construction waste, causing the construction waste to vibrate, which is beneficial to the screening of the construction waste.

[0062] like Figure 4 and Figure 6 As shown, during the process of the crushed stone slab falling from screen 1 22 onto screen 23, the spiral shaft 231 and spiral blades 232 rotate clockwise. The protruding ridges 233 increase the friction between the crushed stone slab and the spiral blades 232, which facilitates the tumbling of the crushed stone slab and reduces the amount of soil remaining on the surface of the crushed stone slab, thereby improving the screening effect between the crushed stone slab and the soil. In addition, the increased friction between the crushed stone slab and the spiral blades 232 by the protruding ridges 233 reduces the impact of construction waste falling onto screen 23, thereby reducing the wear on screen 23.

[0063] like Figure 7 As shown, the drive assembly 3 includes a second drive motor 31 mounted on the frame 21 and a transmission chain 32 connecting the output shaft of the second drive motor 31 and the screw shaft 231.

[0064] Among them, such as Figure 7 As shown, a gear 33 is mounted on the output shaft of the drive motor 231, and two gears 34 are mounted on the end of the spiral shaft 231. A transmission chain 32 is connected between the gear 33 and one of the gears 34. A transmission chain 32 is also connected between the other gear 34 and the gear 34 on the adjacent spiral shaft 231. The transmission chain 32 is connected to the gear 33 and the gear 34, thus realizing the synchronous rotation of multiple spiral shafts 231.

[0065] like Figure 6 and Figure 7 As shown, in this embodiment, two drive components 3 are provided, namely the spiral shaft 231 that drives screen one 22 and the spiral shaft 231 that drives screen two 23 respectively. The spiral shaft 231 that drives screen one 22 and screen two 23 can rotate independently, and the operating state can be adjusted according to the construction waste on each screen, which helps to reduce the accumulation or blockage of construction waste caused by a single drive.

[0066] like Figure 5 As shown, two slide rails 13 are provided on the frame 11 below the frame 21, and the two slide rails 13 are located below the first screen 22 and the second screen 23, respectively. The two slide rails 13 are arranged in parallel, and the length direction of the two slide rails 13 is parallel to the width direction of the frame 11.

[0067] like Figure 5 and Figure 8 As shown, the slide rail 13 is equipped with two sliders 14, with a gap between them. The upper surfaces of both sliders 14 are connected to support columns 17, and the two ends of the support columns 17 are connected to the frame 21. The axial direction of the support columns 17 is parallel to the length direction of the slide rail 13. The support columns 17, the frame 21, and the sliders 14 can slide synchronously.

[0068] like Figure 5 and Figure 8 As shown, a drive motor 15 is mounted on the frame 11. The drive motor 15 drives the frame 21 to reciprocate along the slide rail 13 via a crank-connecting rod mechanism 16. The crank-connecting rod mechanism 16 is a common connection mechanism in the prior art and will not be described in detail.

[0069] like Figure 5 and Figure 6 As shown, the cooperation between the slide rail 13 and the slider 14 allows the support column 17 and the frame 21 connected to it to slide freely in the direction of the slide rail 13, thereby enabling the first screen 22 and the second screen 23 to slide synchronously. The drive motor 15 drives the frame 21 to reciprocate along the slide rail 13 through the crank-connecting rod mechanism 16, which in turn drives the first screen 22 and the second screen 23 to reciprocate. At the same time, the rotation of the spiral shaft 231 and the spiral blades 232 causes the construction waste to vibrate on the first screen 22 and the second screen 23. The combination of these two factors helps to quickly disperse the construction waste on the first screen 22, reduces the local accumulation of construction waste on the first screen 22, and improves the effective area utilization rate of the first screen 22, thereby improving the screening efficiency.

[0070] like Figure 5 and Figure 6 As shown, vibration causes construction waste to jump on screens 22 and 23, reducing the risk of clogging. The reciprocating sliding of screens 22 and 23 increases the contact opportunity between construction waste and the screen openings, which is beneficial for small particles of construction waste to pass smoothly through screens 22 or 23, reducing clogging and thus improving screening efficiency. Compared to simply increasing vibration intensity, the combined motion achieves better results with lower energy consumption, reduces equipment load, and ensures smoother operation.

[0071] like Figure 6 and Figure 8As shown, the end face of the support column 17 near the spiral shaft 231 is an upwardly convex arc shape. The support column 17 is located below screen one 22 and screen two 23, and a distance is left between it and screen one 22 and screen two 23. When construction waste falls through screen one 22 or screen two 23, the arc-shaped structure can guide the construction waste to slide naturally along its curved shape, reducing the accumulation of construction waste on the end face of the support column 17. This facilitates the smoother fall of construction waste onto the vibrating screen 1 located below screen one 22 and screen two 23 for further screening.

[0072] In addition, such as Figure 6 and Figure 8 As shown, falling construction waste will generate an impact force on the support column 17. The arc-shaped end face can distribute this impact force more evenly to various parts of the support column 17, thereby improving the load-bearing capacity and service life of the support column 17.

[0073] like Figure 6 and Figure 8 As shown, the end face of the support column 17 away from the arc is a plane, which facilitates a fixed connection with the slider 14.

[0074] like Figure 1 As shown, both sides of the frame 11 are equipped with baffles 18 that can block construction waste on the first layer of screen 2, and the two baffles 18 are symmetrically arranged. During the vibrating screening process, construction waste may splash or fall from the edge of the first layer of screen 2 due to vibration. The baffles 18 can limit the movement range of construction waste in the width direction of the screen surface, keeping the construction waste within the screening area. This helps to reduce the amount of construction waste that falls outside the equipment or enters the non-working area inside the equipment, reducing the waste of construction waste and the injury to operators caused by splashing construction waste, while also reducing the amount of cleaning work.

[0075] like Figure 1 As shown, each of the two baffles 18 has a guide plate 19 on one side facing each other. The guide plate 19 includes a first plate 191 and a second plate 192 connected to the lower end of the first plate 191. The upper end of the first plate 191 is connected to the upper end of the baffle 18. The inclination of the first plate 191 relative to the horizontal plane is less than the inclination of the second plate 192 relative to the horizontal plane.

[0076] like Figure 1As shown, when construction waste splashes from the screen surface onto baffle 18, it first contacts plate 191 with a relatively small inclination. Its gentle slope slows the falling speed of the construction waste, preventing direct impact or rebound and reducing the risk of secondary splashing. After being buffered by plate 191, the construction waste slides quickly along plate 192 onto screen 22 or screen 23. The large inclination design accelerates the fall of the construction waste, improving screening efficiency. Guide plate 19, through the combination of plate 191 and plate 192, forms a "buffering-acceleration" guiding path, effectively reducing the amount of construction waste spilling from the top or edge of baffle 18 to the outside of the equipment, thus reducing waste.

[0077] The implementation principle of a screening machine for recycling and processing construction waste in this embodiment is as follows:

[0078] like Figure 2 and Figure 3 As shown, the construction waste to be screened is conveyed to the feed trough 211. The drive motor 31 drives the spiral shaft 231 to rotate through the transmission chain 32. The spiral shaft 231 drives the spiral blades 232 to rotate. While the spiral blades 232 are rotating, they are in intermittent contact with the construction waste, causing the construction waste to vibrate and thus achieving the screening of the construction waste.

[0079] like Figure 5 and Figure 6 As shown, the drive motor 15 drives the frame 21 to reciprocate along the slide rail 13 through the crank connecting rod mechanism 16, which in turn drives the screen 22 and the screen 23 to reciprocate. At the same time, the rotation of the spiral shaft 231 and the spiral blade 232 causes the construction waste to vibrate on the screen 22 and the screen 23. The combination of the two is conducive to the rapid dispersion of the construction waste on the screen 22.

[0080] like Figure 1 As shown, the baffles 18 on both sides of the frame 11 can limit the movement range of construction waste in the width direction of the screen surface, so that the construction waste is within the screening area, which helps to reduce the amount of construction waste spilled outside the equipment or entering the non-working area inside the equipment.

[0081] like Figure 1 As shown, construction waste is vibrated and screened on screen 22 before falling onto screen 23. The inclination of screen 23 is greater than that of screen 22, which helps to increase the angle of inclination of the crushed stone slabs laid on screen 22 as they fall onto screen 23. Figure 4 As shown, in addition to the contact between the spiral blade 232 and the crushed stone plate, the protrusion 233 increases the friction between the crushed stone plate and the spiral blade 232, which is conducive to the flipping of the crushed stone plate and reduces the soil stuck on the surface of the crushed stone plate, thereby improving the screening effect of the crushed stone plate and the soil.

[0082] like Figure 1As shown, construction waste passing through screen 1 22 and screen 2 23 falls onto the second-layer screen 12, achieving secondary screening. The construction waste on screen 2 23 is discharged from discharge chute 1 212, and the construction waste on the second-layer screen 12 is discharged from discharge chute 2 121. The construction waste passing through the second-layer screen 12 falls into the collection device below the second-layer screen 12, thus achieving the screening of construction waste.

[0083] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components.

Claims

1. A screening machine for recycling and processing construction waste, comprising a vibrating screen (1) and a layer of screen mesh (2) disposed above the vibrating screen (1), characterized in that: A single-layer screen (2) includes a frame (21), a first screen (22) and a second screen (23) disposed within the frame (21). A connector (24) connects the first screen (22) and the second screen (23). The first screen (22) is located above the second screen (23), and the inclination of the first screen (22) relative to the horizontal plane is less than the inclination of the second screen (23) relative to the horizontal plane. Both screen one (22) and screen two (23) include multiple spiral shafts (231) rotatably connected to the frame (21) and spiral blades (232) arranged on the spiral shafts (231). The spiral blades (232) are provided with protruding ribs (233). The multiple spiral shafts (231) are driven by the drive assembly (3). The drive assembly (3) includes a second drive motor (31) mounted on the frame (21) and a transmission chain (32) connecting the output shaft of the second drive motor (31) and the screw shaft (231). The vibrating screen (1) has a frame (11), and the frame (21) is slidably connected to the frame (11). The frame (11) is equipped with a drive motor (15), which drives the frame (21) to reciprocate through a crank-connecting rod mechanism (16). The connector (24) is Z-shaped. The frame (21) is provided with support rod one (213) and support rod two (214). Support rod one (213) is located above support rod two (214). The spiral shaft (231) of screen one (22) is rotatably connected to support rod one (213). The spiral shaft (231) of screen two (23) is rotatably connected to support rod two (214). The two ends of the connector (24) are respectively connected to support rod one (213) and support rod two (214).

2. The screening machine for recycling and processing construction waste according to claim 1, characterized in that: Both sides of the frame (11) are equipped with baffles (18) that can block construction waste on a layer of screen (2).

3. The screening machine for recycling and processing construction waste according to claim 2, characterized in that: The two baffles (18) are provided with guide plates (19) on opposite sides. The guide plates (19) include a first plate (191) and a second plate (192) connected to the lower end of the first plate (191). The inclination of the first plate (191) relative to the horizontal plane is less than the inclination of the second plate (192) relative to the horizontal plane.

4. The screening machine for recycling and processing construction waste according to claim 3, characterized in that: The frame (11) is provided with a slide rail (13), a slider (14) on the slide rail (13), a support column (17) connected to the slider (14), and the support column (17) is connected to the frame (21).

5. The screening machine for recycling and processing construction waste according to claim 4, characterized in that: The two ends of the support column (17) are connected to the frame (21), and the end face of the support column (17) near the spiral shaft (231) is an upward convex arc.

6. The screening machine for recycling and processing construction waste according to claim 5, characterized in that: The vibrating screen (1) includes two layers of screens (12), which are located below the first layer of screens (2). The end of the second screen (23) is provided with a discharge chute (212), and the end of the second screen (12) is provided with a discharge chute (121).

7. The screening machine for recycling and processing construction waste according to claim 6, characterized in that: A feed trough (211) is provided at one end of screen one (22) away from screen two (23). A mounting plate one (215) is installed below the feed trough (211). The spiral shaft (231) on screen one (22) is rotatably connected to the mounting plate one (215). A mounting plate two (216) is installed below the discharge trough one (212). The spiral shaft (231) on screen two (23) is rotatably connected to the mounting plate two (216).

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