Screening machine for recycling construction waste

Abstract

The invention provides a screening machine for building waste recovery treatment, and relates to the technical field of building waste screening, the screening machine comprises a vibrating screen and a layer of screen mesh, the layer of screen mesh comprises a frame body, a first screen mesh and a second screen mesh, the first screen mesh and the second screen mesh are arranged in the frame body, a connecting piece is connected between the first screen mesh and the second screen mesh, and the first screen mesh is located above the second screen mesh; the inclination of the first screen relative to the horizontal plane is smaller than that of the second screen relative to the horizontal plane. The first screen and the second screen each comprise a plurality of spiral shafts rotationally connected to the frame and spiral blades arranged on the spiral shafts, the spiral blades are provided with protruding edges, and the multiple spiral shafts are driven by a driving assembly. The first layer of screen cloth is designed in a stepped mode, building waste falls onto the second screen cloth along the first screen cloth after being subjected to vibration screening on the first screen cloth, the spiral blades make contact with the stone crushing plate, the friction between the stone crushing plate and the spiral blades is increased through the protruding edges, overturning of the stone crushing plate is facilitated, and soil left on the plate face of the stone crushing plate is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of construction waste screening, and particularly relates to a screening machine for recycling and treating construction waste. Background Art

[0002] Construction waste refers to various wastes generated during construction, demolition or renovation, including engineering soil, engineering slurry, engineering waste, demolition waste and decoration waste, covering concrete blocks, brick and tile fragments, waste mortar, waste metal, etc. By recycling and reusing construction waste, the damage to the natural environment can be reduced, the impact on the ecosystem can be lowered, and at the same time, the demand for raw materials can be reduced and resources can be saved. Among construction waste, waste bricks and tiles can be directly used as backfill materials or subgrade fillers, and concrete blocks are crushed into recycled aggregates to replace natural sand and gravel for the production of new concrete or mortar.

[0003] When recycling and treating construction waste, generally, the construction waste needs to be pretreated such as sorted first, and then crushed. The crushed construction waste is screened by a vibrating screen to separate materials of different particle sizes.

[0004] For example, the patent document with the publication number CN208482784U discloses a centralized vibrating screening device for construction waste. The screening device is provided with three sieve meshes, and the pore diameters of the first sieve mesh, the second sieve mesh and the third sieve mesh are set to decrease in sequence, which is convenient for screening construction waste of different sizes; through the setting that the discharging directions of the first discharging hopper, the second discharging hopper and the third discharging hopper are the front side, the right side and the left side respectively, the screened construction waste is classified and treated.

[0005] Again, the patent document with the publication number CN112845093B discloses a multi-stage screening device for building aggregates. The screening device includes a conveying mechanism, a screening mechanism and a fine screening mechanism. The aggregates to be screened are conveyed to the first sieve mesh of the screening mechanism through the conveying mechanism, and the coarser ones stay on the first sieve mesh. Subsequently, the aggregates to be screened are continuously placed on the conveyor belt, the conveyor belt is rotated and the first sieve mesh is continuously swung up and down. The finer aggregates fall through the first sieve mesh onto the second sieve mesh of the fine screening mechanism for secondary screening of the aggregates.

[0006] Since construction waste may contain concrete fragments, broken stone slabs and soil, etc., the sizes of the broken stone slabs and concrete fragments are different. When the above vibrating screen equipment screens construction waste, when the relatively large broken stone slabs enter the sieve mesh, these broken stone slabs often lie flat on the sieve mesh and cannot be effectively turned over. This causes the soil on the surface of the broken stone slabs to easily stay on the broken stone slabs and is not easily separated through the sieve mesh, thus affecting the screening effect of the broken stone slabs and the soil. Summary of the Invention

[0007] In view of this, the present invention provides a screening machine for building waste recycling and treatment, which solves the technical problem in the prior art that the soil on the crushed stone slab is likely to remain on the crushed stone slab when the crushed stone slab is laid flat on the screen, thus affecting the screening effect of the crushed stone slab and the soil.

[0008] To solve the above technical problem, the present invention provides a screening machine for building waste recycling and treatment, including a vibrating screen and a layer of screen disposed above the vibrating screen. The layer of screen includes a frame body, a first screen and a second screen disposed within the frame body. A connecting member is connected between 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 smaller than the inclination of the second screen relative to the horizontal plane. Both the first screen and the second screen include a plurality of spiral shafts rotatably connected to the frame body and spiral blades disposed on the spiral shafts. Convex ridges are provided on the spiral blades, and the plurality of spiral shafts are driven by a driving assembly.

[0009] By adopting the above technical solution, the building waste to be screened is conveyed onto the first screen. The driving assembly drives the spiral shafts to rotate, and the spiral shafts drive the spiral blades to rotate. While the spiral blades are rotating, they intermittently contact the building waste, causing the building waste to vibrate, which is beneficial to the screening of the building waste. After the building waste is vibration-screened on the first screen, it falls onto the second screen. Moreover, the inclination of the second screen is larger than that of the first screen, which helps to increase the inclination angle of the crushed stone slab laid flat on the first screen when it falls onto the second screen. Coupled with the contact between the spiral blade and the crushed stone slab, the convex ridges increase the friction between the crushed stone slab and the spiral blade, which is beneficial to realizing the flipping of the crushed stone slab and reducing the soil remaining on the surface of the crushed stone slab, thereby being beneficial to improving the screening effect of the crushed stone slab and the soil.

[0010] Due to the stepped arrangement of the first screen and the second screen, the building waste first passes through the first screen with a smaller inclination under the action of gravity and then enters the second screen with a larger inclination, realizing hierarchical screening. The moving speed of the building waste on the first screen is slower, prolonging the screening time, which is beneficial to the separation of large-sized crushed stone slabs, concrete fragments, etc. from the soil. At the same time, it is beneficial to reduce the impact of the building waste falling on the second screen on the second screen. Coupled with the convex ridges increasing the friction between the crushed stone slab and the spiral blade, the impact of the building waste falling on the second screen on the second screen is further reduced, thereby reducing the wear of the second screen.

[0011] Since the inclination of the second screen is larger, the moving speed of the building waste on the second screen is increased, which can reduce the residence time of the building waste on the second screen and is helpful to improve the screening efficiency.

[0012] Preferably, the vibrating screen has a frame, the frame body is slidably connected to the frame, and a first driving motor is provided on the frame. The first driving motor drives the frame body to reciprocate through a crank and connecting rod mechanism.

[0013] By adopting the above technical solution, the frame can slide relative to the rack. The first driving motor converts the rotary motion into the reciprocating linear motion of the frame through the crank-link mechanism, and then drives the first screen and the second screen to perform reciprocating linear motion. At the same time, the rotation of the spiral shaft and the spiral blades causes the construction waste to vibrate on the first screen and the second screen. The combination of the two is conducive to the rapid dispersion of the construction waste on the first screen, reduces the situation of local accumulation of the construction waste on the first screen, is conducive to improving the utilization rate of the effective area of the first screen, and thus is conducive to improving the screening efficiency.

[0014] In addition, the vibration makes the construction waste jump on the first screen and the second screen, reducing the risk of clogging the holes; the reciprocating sliding increases the contact opportunity between the construction waste and the screen holes, which is conducive to the small-particle construction waste passing through the first screen or the second screen smoothly, is conducive to reducing the blockage of the screen holes, and thus is conducive to improving the screening efficiency. Compared with simply increasing the vibration intensity, the compound motion can achieve better results with lower energy consumption, reduce the equipment load, and operate more smoothly.

[0015] Preferably, the connecting piece is Z-shaped. The frame is provided with a first support rod and a second support rod. The first support rod is located above the second support rod. The spiral shaft of the first screen is rotatably connected to the first support rod, and the spiral shaft of the second screen is rotatably connected to the second support rod. The two ends of the connecting piece are respectively connected to the first support rod and the second support rod.

[0016] By adopting the above technical solution, the first support rod is located above the second support rod, and respectively supports the spiral shafts of the first screen and the second screen, forming an independent and stable support structure in the upper and lower layers. The upper and lower spiral shafts rotate independently, reducing the axial interference caused by vibration or the impact of construction waste, and improving the operation stability. The two ends of the Z-shaped connecting piece are respectively connected to the first support rod and the second support rod, forming a rigid frame structure, enhancing the overall torsion resistance and bending resistance, and adapting to high-load screening operations.

[0017] Preferably, baffles capable of blocking the construction waste on the first layer of screen are provided on both sides of the rack.

[0018] By adopting the above technical solution, the construction waste may splash or fall from the edge of the first layer of screen during the vibration screening process. The baffle can limit the movement range of the construction waste in the width direction of the screen surface, keep the construction waste within the screening area, is conducive to reducing the situation that the construction waste spills outside the equipment or enters the non-working area inside the equipment, reducing the waste of the construction waste and the harm to the operator caused by the splash of the construction waste, and at the same time reducing the cleaning workload.

[0019] Preferably, guide plates are provided on the opposite sides of the two baffles. 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 smaller than the inclination of the second plate relative to the horizontal plane.

[0020] By adopting the above technical solution, when the construction waste splashes from the sieve surface to the baffle, it first contacts the plate one with a smaller inclination. Its gentle inclined surface can slow down the falling speed of the construction waste, avoid direct impact or rebound of the construction waste, and reduce the risk of secondary splashing. After being buffered by the plate one, the construction waste quickly slides down along the plate two onto the sieve mesh one or the sieve mesh two. The large inclination design can accelerate the falling of the construction waste and improve the screening efficiency. The guide plate forms a "buffering - accelerating" diversion path through the combination of the plate one and the plate two, effectively reducing the construction waste from spilling from the top or edge of the baffle to the outside of the equipment and reducing the waste of construction waste.

[0021] Preferably, a slide rail is provided on the frame, a slider is provided on the slide rail, and a support column is connected to the slider. The support column is connected to the frame.

[0022] By adopting the above technical solution, the cooperation of the slide rail and the slider enables the support column and the frame connected thereto to freely slide in the direction of the slide rail, so that the sieve mesh one and the sieve mesh two can slide synchronously. The driving motor one drives the frame to reciprocate along the slide rail through the crank - connecting rod mechanism, and then drives the sieve mesh one and the sieve mesh two to reciprocate, which is beneficial to the rapid dispersion of the construction waste on the sieve mesh one, reduces the situation of local accumulation of the construction waste on the sieve mesh one, is beneficial to improving the utilization rate of the effective area of the sieve mesh one, and at the same time increases the contact opportunity between the construction waste and the sieve holes, is beneficial to the small - particle construction waste passing through the sieve mesh one or the sieve mesh two smoothly, is beneficial to reducing the blockage of the sieve holes, and thus is beneficial to improving the screening efficiency.

[0023] Preferably, both ends of the support column are connected to the frame, and the end face of the support column close to the spiral shaft is convex upward in an arc shape.

[0024] By adopting the above technical solution, the support column is located below the sieve mesh one and the sieve mesh two. When the construction waste falls through the sieve mesh one or the sieve mesh two, the arc - shaped structure can guide the construction waste to slide naturally along its curve shape, reduce the accumulation of the construction waste on the end face of the support column, and thus is beneficial to the construction waste falling more smoothly onto the vibrating screen located below the sieve mesh one and the sieve mesh two for re - screening. In addition, when the construction waste falls, it will generate an impact force on the support column. The arc - shaped end face can disperse this impact force more evenly to each part of the support column, and thus is beneficial to improving the bearing capacity and service life of the support column.

[0025] Preferably, the vibrating screen includes two - layer sieve meshes. The two - layer sieve mesh is located below the one - layer sieve mesh. The end of the sieve mesh two is provided with a discharge slot one, and the end of the two - layer sieve mesh is provided with a discharge slot two.

[0026] By adopting the above technical solution, the design of the double-layer screen enables construction waste to undergo two screening processes with different specifications. The first layer of the screen first performs a preliminary screening on the construction waste to separate the larger particles of construction waste; the second layer of the screen then performs a further fine screening on the construction waste passing through the first layer of the screen to separate medium-sized particles and fine particles. The discharge chute one and the discharge chute two respectively collect construction waste with different particle sizes, facilitating the classified collection and storage of various levels of construction waste. Construction waste with different particle sizes can be further processed according to its use, improving the efficiency of construction waste recycling.

[0027] Preferably, one end of the first screen away from the second screen is provided with a feed chute, a first mounting plate is installed below the feed chute, the spiral shaft on the first screen is rotatably connected to the first mounting plate, a second mounting plate is installed below the discharge chute one, and the spiral shaft on the second screen is rotatably connected to the second mounting plate.

[0028] By adopting the above technical solution, the two ends of the spiral shaft on the first screen are respectively rotatably connected to the first mounting plate and the first support rod, the two ends of the spiral shaft on the second screen are respectively rotatably connected to the second mounting plate and the second support rod, and the drive assembly drives the spiral shaft to rotate, thereby driving the spiral blades to rotate, realizing the screening of construction waste.

[0029] Preferably, the drive assembly includes a second drive motor provided on the frame body and a transmission chain connecting the output shaft of the second drive motor and the spiral shaft.

[0030] By adopting the above technical solution, the second drive motor drives the spiral shaft to rotate through the transmission chain, thereby driving the spiral blades to rotate, realizing the screening of construction waste.

[0031] The beneficial effects of the above technical solutions of the present invention are as follows: 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, and the inclination of the second screen is larger than that of the first screen, which helps to increase the inclination angle of the crushed stone slab laid flat on the first screen when it falls onto the second screen. Coupled with the contact between the spiral blades and the crushed stone slab, the convex edges increase the friction between the crushed stone slab and the spiral blades, which is beneficial to realizing the flipping of the crushed stone slab and reducing the soil remaining on the surface of the crushed stone slab, thus being beneficial to improving the screening effect of the crushed stone slab and the soil.

[0032] 2. The first drive motor drives the first screen and the second screen to perform reciprocating linear motion through the crank-link mechanism. At the same time, the rotation of the spiral shaft and the spiral blades vibrates the construction waste on the first screen and the second screen. The combination of the two is beneficial to the rapid dispersion of the construction waste on the first screen, reducing the situation of local accumulation of construction waste on the first screen, being beneficial to improving the utilization rate of the effective area of the first screen, and thus being beneficial to improving the screening efficiency.

[0033] 3. The present invention is provided with baffles on both sides of the frame. The baffles can limit the movement range of construction waste in the width direction of the sieve surface, keeping the construction waste within the screening area, which is beneficial to reducing the spillage of construction waste outside the equipment or its entry into the non-working area inside the equipment, reducing the waste of construction waste and the harm to operators caused by the splashing of construction waste, and at the same time reducing the cleaning workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic structural view of the screening machine for recycling and processing construction waste of the present invention; Figure 2 is a sectional view of the screening machine for recycling and processing construction waste of the present invention; Figure 3 is Figure 2 an enlarged view of part A in Figure 4 is a schematic structural view of the spiral shaft of the present invention; Figure 5 is a sectional view of the first-layer sieve mesh of the present invention; Figure 6 is a top view of the first-layer sieve mesh of the present invention; Figure 7 is a partial structural view of the spiral shaft driven by the drive assembly of the present invention; Figure 8 is a structural view of the drive motor one driving the frame to move of the present invention.

[0035] In the figure: 1. vibrating screen; 11. frame; 12. second-layer sieve mesh; 121. second discharge slot; 13. slide rail; 14. slider; 15. drive motor one; 16. crank and connecting rod mechanism; 17. support column; 18. baffle; 19. guide plate; 191. plate one; 192. plate two; 2. first-layer sieve mesh; 21. frame body; 211. feed slot; 212. first discharge slot; 213. first support rod; 214. second support rod; 215. first mounting plate; 216. second mounting plate; 22. first sieve mesh; 23. second sieve mesh; 231. spiral shaft; 232. spiral blade; 233. convex rib; 24. connecting piece; 3. drive assembly; 31. drive motor two; 32. transmission chain; 33. first gear; 34. second gear. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] For the purpose of making the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described clearly and completely below in conjunction with the Figures 1-8 of the embodiments of the present invention.

[0037] Embodiment This embodiment provides a screening machine for recycling and processing construction waste, as Figure 1As shown in the figure, it includes a vibrating screen 1 and a layer of screen mesh 2 arranged above the vibrating screen 1.

[0038] As Figure 1 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. This vibrating screen 1 has a frame 11 and a second-layer screen mesh 12, and the second-layer screen mesh 12 is located below the first-layer screen mesh 2.

[0039] As Figure 1 shown, the first-layer screen mesh 2 includes a frame body 21, a first screen mesh 22 and a second screen mesh 23 arranged inside the frame body 21.

[0040] As Figure 1 shown, the frame body 21 is slidably arranged on the frame 11. One end of the frame body 21 is provided with a feed chute 211, and the other end is provided with a first discharge chute 212. The frame body 21 is gradually inclined downward from the end close to the feed chute 211 to the end close to the first discharge chute 212.

[0041] As Figure 1 shown, the first screen mesh 22 is connected to the feed chute 211, the second screen mesh 23 is connected to the first discharge chute 212, and the first screen mesh 22 is located above the second screen mesh 23, with a gap left between the first screen mesh 22 and the second screen mesh 23 up and down. The end of the second-layer screen mesh 12 is provided with a second discharge chute 121.

[0042] As Figure 1 shown, the design of the double-layer screen mesh enables construction waste to undergo two screening processes with different specifications. The first-layer screen mesh 2 first conducts a preliminary screening on the construction waste to separate out the larger particle-sized construction waste; the second-layer screen mesh 12 then conducts a further fine screening on the construction waste passing through the first-layer screen mesh 2 to separate out medium-sized particles and fine particles.

[0043] As Figure 1 shown, the construction waste on the first-layer screen mesh 2 is discharged through the first discharge chute 212, and the construction waste on the second-layer screen mesh 12 is discharged through the second discharge chute 121, facilitating the classified collection and storage of construction waste at all levels.

[0044] As Figure 2 and Figure 3 shown, there is a Z-shaped connecting piece 24 connected between the first screen mesh 22 and the second screen mesh 23. The inclination of the first screen mesh 22 relative to the horizontal plane is less than that of the second screen mesh 23 relative to the horizontal plane, that is, the second screen mesh 23 is steeper than the first screen mesh 22.

[0045] As Figure 2 and Figure 3 shown, in the middle part of the frame body 21, there are a first support rod 213 and a second support rod 214. The first support rod 213 is located above the second support rod 214. The upper end of the connecting piece 24 is connected to the first support rod 213, and the lower end of the connecting piece 24 is connected to the second support rod 214.

[0046] As Figure 1 and Figure 2 shown, after the construction waste is vibrated and screened on the first screen 22, it falls onto the second screen 23. Moreover, the inclination of the second screen 23 is larger than that of the first screen 22, which helps to increase the inclination angle of the crushed stone slab laid flat on the first screen 22 when it falls onto the second screen 23, facilitating the flipping of the crushed stone slab and reducing the soil remaining on the surface of the crushed stone slab, thus being beneficial to improving the screening effect of the crushed stone slab and the soil.

[0047] As Figure 1 and Figure 2 shown, through the stepped arrangement of the first screen 22 and the second screen 23, under the action of gravity, the construction waste first passes through the first screen 22 with a smaller inclination and then enters the second screen 23 with a larger inclination, achieving hierarchical screening. The moving speed of the construction waste on the first screen 22 is slower, prolonging the screening time, which is beneficial to the separation of large crushed stone slabs, concrete fragments, etc. from the soil. At the same time, it is beneficial to reduce the impact of the falling construction waste on the second screen 23. Due to the larger inclination of the second screen 23, the moving speed of the construction waste on the second screen 23 increases, which can reduce the residence time of the construction waste on the second screen 23 and help improve the screening efficiency.

[0048] As Figure 3 and Figure 4 shown, both the first screen 22 and the second screen 23 include a plurality of spiral shafts 231 rotatably connected to the frame body 21 and spiral blades 232 arranged on the spiral shafts 231. The plurality of spiral shafts 231 are arranged in parallel, and convex ribs 233 are provided on the spiral blades 232. The upward section of the spiral blades 232 is designed to be non-arc-shaped, and the plurality of spiral shafts 231 are driven by a driving assembly 3.

[0049] As Figure 2 and Figure 3 shown, a first mounting plate 215 is installed below the feed chute opening 211, and both ends of the spiral shaft 231 on the first screen 22 are rotatably connected to the first mounting plate 215 and the first support rod 213 respectively.

[0050] As Figure 2 and Figure 3 shown, a second mounting plate 216 is installed below the first discharge chute opening 212, and both ends of the spiral shaft 231 on the second screen 23 are rotatably connected to the second mounting plate 216 and the second support rod 214 respectively.

[0051] As Figure 1 and Figure 3As shown, the construction waste to be screened is transported to the screen 22, and the driving component 3 drives the screw shaft 231 to rotate, and the screw shaft 231 drives the spiral blade 232 to rotate. While the spiral blade 232 rotates, it intermittently contacts with the construction waste, causing the construction waste to vibrate, which is beneficial to the screening of the construction waste.

[0052] like Figure 4 and Figure 6 As shown, when the crushed stone plate on the first screen 22 falls to the second screen 23, as the spiral shaft 231 and the spiral blade 232 rotate clockwise, the convex ridge 233 increases the friction between the crushed stone plate and the spiral blade 232, which is conducive to turning over the crushed stone plate and reducing the soil trapped on the surface of the crushed stone plate, thereby helping to improve the screening effect of the crushed stone plate and the soil. In addition, the convex ridge 233 increases the friction between the crushed stone plate and the spiral blade 232, reducing the impact of the construction waste on the second screen 23 when it falls on the second screen 23, thereby reducing the wear on the second screen 23.

[0053] like Figure 7 As shown, the driving assembly 3 includes a second driving motor 31 disposed on the frame 21 , and a transmission chain 32 connecting the output shaft of the second driving motor 31 and the screw shaft 231 .

[0054] Among them, Figure 7 As shown, a gear 1 33 is installed on the output shaft of the driving motor 2 31, and two gear 2s 34 are installed at the end of the screw shaft 231. A transmission chain 32 is connected between the gear 1 33 and one of the gear 2s 34, and a transmission chain 32 is also connected between the other gear 2 34 and the gear 2 34 on the adjacent screw shaft 231. The transmission chain 32 is connected to the gear 1 33 and the gear 2 34, so that the synchronous rotation of multiple screw shafts 231 is achieved.

[0055] like Figure 6 and Figure 7 As shown, two drive assemblies 3 are provided in this embodiment, namely, the screw shaft 231 driving the first screen 22 and the screw shaft 231 driving the second screen 23. The screw shaft 231 driving the first screen 22 and the screw shaft 231 driving the second screen 23 can rotate independently, and the operating state can be adjusted according to the construction waste on each screen, which is conducive to reducing the accumulation or blockage of construction waste caused by a single drive.

[0056] like Figure 5 As shown, two slide rails 13 are provided on the frame 11 below the frame body 21, and the two slide rails 13 are respectively located below the screen 1 22 and the screen 2 23. 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.

[0057] like Figure 5 and Figure 8As shown in the figure, two sliders 14 are provided on the slide rail 13, with a gap left between the two sliders 14. The upper end surfaces of the two sliders 14 are both connected to the support columns 17, and both 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 and the frame 21 can slide synchronously with the sliders 14.

[0058] As Figure 5 and Figure 8 shown in the figure, a driving motor 15 is provided on the frame 11. The driving motor 15 drives the frame 21 to reciprocate along the slide rail 13 through the crank - connecting rod mechanism 16. The crank - connecting rod mechanism 16 is a general connecting mechanism in the prior art and will not be described in detail.

[0059] As Figure 5 and Figure 6 shown in the figure, the cooperation between the slide rail 13 and the sliders 14 enables the support columns 17 and the frame 21 connected thereto to slide freely in the direction of the slide rail 13, so that the first screen 22 and the second screen 23 can slide synchronously. The driving motor 15 drives the frame 21 to reciprocate along the slide rail 13 through the crank - connecting rod mechanism 16, and then 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 makes the construction waste vibrate on the first screen 22 and the second screen 23. The combination of the two is conducive to the rapid dispersion of the construction waste on the first screen 22, reducing the situation of local accumulation of the construction waste on the first screen 22, which is conducive to improving the utilization rate of the effective area of the first screen 22, and thus conducive to improving the screening efficiency.

[0060] As Figure 5 and Figure 6 shown in the figure, the vibration makes the construction waste jump on the first screen 22 and the second screen 23, reducing the risk of blockage of the holes; the reciprocating sliding of the first screen 22 and the second screen 23 increases the contact opportunity between the construction waste and the screen holes, which is conducive to the small - particle construction waste passing through the first screen 22 or the second screen 23 smoothly, and is conducive to reducing the blockage of the screen holes, thus conducive to improving the screening efficiency. Compared with simply increasing the vibration intensity, the compound movement can achieve better results with lower energy consumption, reduce the equipment load and operate more smoothly.

[0061] As Figure 6 and Figure 8 shown in the figure, the end surface of the support column 17 close to the spiral shaft 231 is in an upward - convex arc shape. The support column 17 is located below the first screen 22 and the second screen 23, and there is a distance between the support column 17 and the first screen 22 and the second screen 23. When the construction waste falls through the first screen 22 or the second screen 23, the arc - shaped structure can guide the construction waste to slide naturally along its curve shape, reducing the accumulation of the construction waste on the end surface of the support column 17, so that the construction waste can fall more smoothly onto the vibrating screen 1 located below the first screen 22 and the second screen 23 for re - screening.

[0062] In addition, as Figure 6 and Figure 8 shown, when the construction waste falls, it will generate an impact force on the support column 17. The arc-shaped end face can disperse this impact force more evenly to various parts of the support column 17, thus contributing to improving the load-bearing capacity and service life of the support column 17.

[0063] As Figure 6 and Figure 8 shown, the end face of the support column 17 away from the arc is a plane, which is convenient for realizing the fixed connection with the slider 14.

[0064] As Figure 1 shown, baffles 18 capable of blocking the construction waste on the first-layer screen 2 are provided on both sides of the frame 11, and the two baffles 18 are symmetrically arranged. During the vibration screening process of the construction waste, it may splash due to vibration or spill from the edge of the first-layer screen 2. The baffle 18 can limit the movement range of the construction waste in the width direction of the screen surface, keeping the construction waste within the screening area, which is beneficial to reducing the spillage of the construction waste to the outside of the equipment or entering the non-working area inside the equipment, reducing the waste of the construction waste and the harm to the operators caused by the splash of the construction waste, and at the same time reducing the cleaning workload.

[0065] As Figure 1 shown, guide plates 19 are provided on the opposite sides of the two baffles 18. 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, and the inclination of the first plate 191 relative to the horizontal plane is smaller than the inclination of the second plate 192 relative to the horizontal plane.

[0066] As Figure 1 shown, when the construction waste splashes from the screen surface to the baffle 18, it first contacts the first plate 191 with a smaller inclination. Its gentle inclined surface can slow down the falling speed of the construction waste, avoid the direct impact or rebound of the construction waste, and reduce the risk of secondary splash. After the construction waste is buffered by the first plate 191, it quickly slides down along the second plate 192 to the first-layer screen 22 or the second-layer screen 23. The large inclination design can accelerate the falling of the construction waste and improve the screening efficiency. The guide plate 19 forms a "buffer-acceleration" diversion path through the combination of the first plate 191 and the second plate 192, effectively reducing the spillage of the construction waste from the top or edge of the baffle 18 to the outside of the equipment and reducing the waste of the construction waste.

[0067] The implementation principle of a screening machine for recycling and treating construction waste in this embodiment: As Figure 2 and Figure 3As shown, the construction waste to be screened is conveyed to the feeding chute opening 211. The driving motor two 31 drives the spiral shaft 231 to rotate through the transmission chain 32. The spiral shaft 231 drives the spiral blade 232 to rotate. While the spiral blade 232 rotates, it intermittently contacts the construction waste, causing the construction waste to vibrate and realizing the screening of the construction waste.

[0068] As Figure 5 and Figure 6 shown, the driving motor one 15 drives the frame 21 to reciprocate along the slide rail 13 through the crank - connecting rod mechanism 16, thereby driving 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 blade 232 causes the construction waste to vibrate on the first screen 22 and the second screen 23. The combination of the two is conducive to the rapid dispersion of the construction waste on the first screen 22.

[0069] As Figure 1 shown, the baffles 18 on both sides of the frame 11 can limit the movement range of the construction waste in the width direction of the screen surface, keeping the construction waste within the screening area, which is conducive to reducing the spillage of the construction waste outside the equipment or entering the non - working area inside the equipment.

[0070] As Figure 1 shown, after the construction waste is vibration - screened on the first screen 22, it falls onto the second screen 23. Moreover, the inclination of the second screen 23 is larger than that of the first screen 22, which helps to increase the inclination angle of the broken stone slab laid flat on the first screen 22 when it falls onto the second screen 23. As Figure 4 shown, coupled with the contact between the spiral blade 232 and the broken stone slab, the convex ribs 233 increase the friction between the broken stone slab and the spiral blade 232, which is conducive to realizing the flipping of the broken stone slab and reducing the soil remaining on the surface of the broken stone slab, thus being conducive to improving the screening effect of the broken stone slab and the soil.

[0071] As Figure 1 shown, the construction waste passing through the first screen 22 and the second screen 23 falls onto the second - layer screen 12 to achieve secondary screening. The construction waste on the second screen 23 is discharged from the first discharge chute opening 212, and the construction waste on the second - layer screen 12 is discharged from the second discharge chute opening 121. The construction waste passing through the second - layer screen 12 falls into the collection device below the second - layer screen 12, realizing the screening of the construction waste.

[0072] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components.

Claims

1. A screening machine for the recycling and treatment of construction waste, comprising a vibrating screen (1) and a layer of screen mesh (2) arranged above the vibrating screen (1), characterized in that: The first - layer screen (2) includes a frame body (21), a first screen (22) and a second screen (23) arranged inside the frame body (21). A connecting piece (24) is connected between 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 that of the second screen (23) relative to the horizontal plane. Both the first screen (22) and the second screen (23) include a plurality of spiral shafts (231) rotatably connected to the frame body (21) and spiral blades (232) arranged on the spiral shafts (231). Convex ribs (233) are provided on the spiral blades (232), and the plurality of spiral shafts (231) are driven by a driving assembly (3).

2. The screening machine for recycling and processing construction waste according to claim 1, wherein: The vibrating screen (1) has a frame (11). The frame body (21) is slidably connected to the frame (11). A first driving motor (15) is provided on the frame (11), and the first driving motor (15) drives the frame body (21) to reciprocate through a crank - connecting rod mechanism (16).

3. The screening machine for recycling and processing construction waste according to claim 2, wherein: The connecting piece (24) is Z - shaped. A first support rod (213) and a second support rod (214) are provided on the frame body (21). The first support rod (213) is located above the second support rod (214). The spiral shaft (231) of the first screen (22) is rotatably connected to the first support rod (213), the spiral shaft (231) of the second screen (23) is rotatably connected to the second support rod (214), and the two ends of the connecting piece (24) are respectively connected to the first support rod (213) and the second support rod (214).

4. The screening machine for recycling and processing construction waste according to claim 3, characterized in that: Baffles (18) capable of blocking construction waste on the first - layer screen (2) are provided on both sides of the frame (11).

5. The screening machine for recycling and processing construction waste according to claim 4, characterized in that: Guide plates (19) are provided on the opposite sides of the two baffles (18). 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 inclination of the first plate (191) relative to the horizontal plane is less than that of the second plate (192) relative to the horizontal plane.

6. The screening machine for recycling and processing construction waste according to claim 5, characterized in that: A slide rail (13) is provided on the frame (11). A slider (14) is arranged on the slide rail (13), and a support column (17) is connected to the slider (14). The support column (17) is connected to the frame body (21).

7. The screening machine for recycling and processing construction waste according to claim 6, characterized in that: Both ends of the support column (17) are connected to the frame body (21), and the end face of the support column (17) close to the spiral shaft (231) is convex upward in an arc shape.

8. The screening machine for recycling and processing construction waste according to claim 7, wherein: The vibrating screen (1) includes a second - layer screen (12). The second - layer screen (12) is located below the first - layer screen (2). A first discharge slot (212) is provided at the end of the second screen (23), and a second discharge slot (121) is provided at the end of the second - layer screen (12).

9. The screening machine for recycling and processing construction waste according to claim 8, characterized in that: An inlet slot (211) is provided at one end of the first screen (22) far from the second screen (23). A first mounting plate (215) is installed below the inlet slot (211). The spiral shaft (231) on the first screen (22) is rotatably connected to the first mounting plate (215). A second mounting plate (216) is installed below the first discharge slot (212). The spiral shaft (231) on the second screen (23) is rotatably connected to the second mounting plate (216).

10. The screening machine for building waste recycling according to claim 9, characterized in that: The driving assembly (3) includes a second driving motor (31) arranged on the frame body (21) and a transmission chain (32) connecting the output shaft of the second driving motor (31) and the spiral shaft (231).

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