Method and device for resource utilization of construction waste

Abstract

The application provides a building slag resource utilization method and device, and belongs to the technical field of building slag recycling, and comprises a rack, which is sequentially integrated with a pretreatment feeding mechanism, a multistage crushing and screening mechanism, a quantitative feeding and mixing mechanism, a self-adaptive pressing forming mechanism and a layered drying and solidifying mechanism from top to bottom along the material flow direction; a mechanical transmission assembly is arranged at the bottom of the rack, and the mechanical transmission assembly is respectively linked with the pretreatment feeding mechanism, the multistage crushing and screening mechanism, the quantitative feeding and mixing mechanism, the self-adaptive pressing forming mechanism and the layered drying and solidifying mechanism through transmission shafts and chains. The building slag resource utilization method and device solve the problems of poor adaptability, uneven mixing, no self-adaptation in pressing, easy cracking in drying and discontinuous process of the existing building slag treatment equipment.

Description

Technical Field

[0001] This invention relates to the field of construction waste recycling technology, and in particular to a method and apparatus for the resource utilization of construction waste. Background Technology

[0002] Construction waste is the main solid waste generated during construction, including various loose materials such as slag, soft soil, and silt. Its resource utilization is a key link in achieving the reduction, harmlessness, and recycling of construction waste. Currently, the industry generally adopts processes such as crushing, mixing and solidification, pressing and molding, and drying to process construction waste into recycled brick and tile building materials to improve the utilization rate of solid waste.

[0003] In practical applications, existing processing equipment generally suffers from insufficient material adaptability. For easily agglomerated materials such as soft soil and silty soil, clumping, blockage, and uneven crushing are common, affecting subsequent mixing and molding effects. At the same time, insufficient mixing by the mixing mechanism can easily lead to uneven ratios of slag and solidifying agent, resulting in unstable strength and easy cracking of finished bricks and tiles. The fixed pressure of the pressing mechanism cannot be matched with different soil types and moisture contents, further reducing the qualified rate of finished products.

[0004] In addition, most of the existing equipment is in a split layout, with each process operating independently and poorly connected. Materials are prone to spillage and clumping during transportation, resulting in low overall continuity and operational efficiency. The drying method mostly adopts direct hot air drying, which can easily cause inconsistent drying rates inside and outside the brick blank, resulting in surface drying and internal moisture residue, which aggravates the deformation and cracking of finished products and makes it difficult to stably produce high-quality recycled building materials. Summary of the Invention

[0005] The purpose of this invention is to provide a method and apparatus for the resource utilization of construction waste, which solves the problems of poor adaptability, uneven mixing, lack of self-adaptation in pressing, easy cracking during drying, and discontinuous process in existing construction waste treatment equipment.

[0006] To achieve the above objectives, the present invention provides a device for the resource utilization of construction waste, comprising a frame, wherein a pretreatment feeding mechanism, a multi-stage crushing and screening mechanism, a quantitative feeding and mixing mechanism, an adaptive pressing and molding mechanism, and a layered drying and curing mechanism are sequentially integrated from top to bottom along the material flow direction of the frame; a mechanical transmission component is provided at the bottom of the frame, which is connected to the pretreatment feeding mechanism, the multi-stage crushing and screening mechanism, the quantitative feeding and mixing mechanism, the adaptive pressing and molding mechanism, and the layered drying and curing mechanism respectively through a transmission shaft and a chain.

[0007] Preferably, the pretreatment feeding mechanism includes a feeding hopper, anti-blocking feeding rollers, and an inclined guide plate; the feeding hopper is fixed to the top of the frame, and two sets of opposing rotating anti-blocking feeding rollers are symmetrically rotated on the inner wall of the feeding hopper, and the outer wall of the anti-blocking feeding rollers is provided with arc-shaped feeding teeth; the bottom outlet of the feeding hopper is connected to the inclined guide plate, and the end of the inclined guide plate extends to directly above the feed inlet of the multi-stage crushing and screening mechanism.

[0008] Preferably, the multi-stage crushing and screening mechanism includes a crushing box, with a coarse crushing roller assembly on the upper part of the crushing box, the surface of which is provided with spiral crushing teeth; a fine grinding chamber is connected below the coarse crushing roller assembly, the inner wall of which is fixed with an annular grinding tooth ring, and a rotating grinding disc is mounted at the center; a vibrating screen is horizontally arranged below the fine grinding chamber, and the vibrating screen is connected to an eccentric wheel vibration assembly; a return guide plate is inclinedly arranged above the vibrating screen, with its high end connected to the coarse material discharge end of the screen and its low end extending to the feed side of the fine grinding chamber; and a collection bin is sealed and connected below the vibrating screen.

[0009] Preferably, the quantitative feeding and mixing mechanism includes a quantitative feeding auger, a curing agent storage bin, and a mixing chamber; the quantitative feeding auger is connected to the bottom of the collection bin, and the auger's discharge end is connected to the mixing chamber; the curing agent storage bin is vertically fixed to the top of the mixing chamber, and a mechanical discharge gate is provided at the bottom, with a spiral spreading component correspondingly arranged below the gate; two sets of counter-rotating dual-shaft mixing main shafts are mounted in parallel rotation inside the mixing chamber, and staggered bent surface mixing paddles are provided on the outer wall of the main shafts; a mixing discharge port is opened at the bottom of the mixing chamber to connect to an adaptive pressing and molding mechanism.

[0010] Preferably, the adaptive pressing and molding mechanism includes a molding frame and a molding die base, with brick and tile molding cavities arrayed inside the molding die base; a floating compaction plate is set directly above the molding die base, and the floating compaction plate is connected to a spring mounting seat through an elastic adaptive pressure spring, the spring mounting seat being fixed to the top of the molding frame; a cam drive shaft is rotatably mounted below the molding die base, the cam drive shaft is sleeved with a top material cam, the top material cam is attached to a top material plate, and the top material plate is vertically slidably mounted at the bottom of the cavity; a molding discharge conveyor belt is set on the side of the molding die base, and the molding discharge conveyor belt is connected to a layered drying and curing mechanism.

[0011] Preferably, the layered drying and curing mechanism includes a sealed drying chamber, a hot air guiding cavity at the bottom of the chamber, and a porous hot air guiding plate on the top of the guiding cavity; a waste heat return cavity is provided on the inner side of the top of the chamber, and the waste heat return cavity is connected to the bottom hot air guiding cavity through a waste heat return pipe to form a circulation; multiple layers of breathable bearing mesh belts are horizontally arranged from top to bottom inside the drying chamber, and the mesh belts are connected to mesh belt drive rollers; the end of the chamber is connected to the drying discharge platform.

[0012] A method for the resource utilization of construction waste includes the following steps: S1. Material pretreatment: Construction waste is put into the feed hopper, and the adhering materials are broken up by the anti-blocking material roller. The inclined guide plate then feeds the material into the multi-stage crushing and screening mechanism at a uniform speed. S2. Multi-stage crushing and screening: After being coarsely crushed by the coarse crushing roller group, the material enters the fine grinding chamber for fine grinding, and then is screened by the vibrating screen. The qualified fine material enters the collection bin, and the coarse particles are returned to the reflux guide plate for secondary grinding. S3. Quantitative mixing: Qualified fine materials are fed into the mixing tank by a quantitative feeding auger, and the curing agent is evenly sprinkled in by a spiral sprinkling component. The dual-shaft reverse mixing paddle mixes without dead corners. S4. Adaptive pressing molding: The mixed materials fall into the molding cavity, the floating compaction plate adapts to the pressure adjustment molding with the help of the elastic spring, and the cam pushes out the brick blank and conveys it to the drying process. S5. Layered Gradient Drying: The brick blanks move in multiple layers of breathable mesh belts, and hot air is used for gradient drying from bottom to top. The waste heat is recycled and reused. After drying, recycled brick and tile products are output.

[0013] Therefore, the present invention employs the above-mentioned method and apparatus for the resource utilization of construction waste, and the technical effects are as follows: 1. Significantly improved material compatibility and crushing uniformity: The multi-stage crushing and screening and mechanical reflux structure can stably process construction waste, soft soil and silty soil, avoid caking and material blockage, and make the material finer and more uniform, providing a stable foundation for subsequent solidification reaction.

[0014] 2. Significantly improved mixing and molding quality: Dual-axis reverse curved surface mixing eliminates mixing dead zones, allowing for more thorough mixing of the curing agent and slag; the purely mechanical elastic adaptive compaction structure can match different soil types and moisture contents, avoiding crushing or insufficient compaction, and significantly improving the strength of bricks and tiles and the finished product qualification rate.

[0015] 3. Integrated continuous operation is more efficient and the finished product is more stable. The whole machine is a pure mechanical linkage integrated design with tight process connection and no material loss, resulting in higher operating efficiency and lower energy consumption. Layered gradient drying and waste heat circulation make the brick blank dry evenly inside and out, effectively reducing cracking and deformation and improving the quality of resource-based finished products. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the internal assembly structure of the multi-stage crushing and screening mechanism of the present invention; Figure 3 This is a top view of the internal structure of the quantitative feeding and mixing mechanism of the present invention; Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the adaptive pressing and forming mechanism of the present invention; Figure 5 This is a schematic cross-sectional view of the layered gradient drying and curing mechanism of the present invention; Figure 6 This is a flow chart of a process for the resource utilization of construction waste according to the present invention.

[0017] Figure Labels 1. Frame; 2. Pre-treatment feeding mechanism; 201. Feed hopper; 202. Anti-blocking feed roller; 203. Inclined guide plate; 3. Multi-stage crushing and screening mechanism; 301. Crushing box; 302. Coarse crushing roller group; 303. Spiral crushing teeth; 304. Fine grinding chamber; 305. Annular grinding tooth ring; 306. Rotary grinding disc; 307. Eccentric wheel vibration assembly; 308. Vibrating screen; 309. Return guide plate; 310. Collection bin; 4. Quantitative feeding and mixing mechanism; 401. Quantitative feeding auger; 402. Auger drive shaft; 403. Curing agent storage bin; 404. Mechanical discharge gate; 405. Spiral spreading assembly; 406. Mixing box; 407. Dual-shaft mixing main shaft; 408. Bending... 5. Adaptive pressing and molding mechanism; 501. Molding frame; 502. Molding mold base; 503. Brick and tile molding cavity; 504. Floating compaction plate; 505. Spring mounting seat; 506. Elastic adaptive pressure spring; 507. Cam drive shaft; 508. Top material cam; 509. Top material plate; 510. Molding discharge conveyor belt; 6. Layered drying and curing mechanism; 601. Sealed drying chamber; 602. Chamber support; 603. Hot air guide chamber; 604. Porous hot air guide plate; 605. Waste heat return chamber; 606. Waste heat return pipe; 607. Multi-layer breathable bearing mesh belt; 608. Mesh belt drive roller; 609. Drying discharge platform; 7. Mechanical transmission components; 701. Drive motor. Detailed Implementation

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0020] Example 1 like Figures 1-5 As shown, the present invention provides a device for the resource utilization of construction waste, including a frame 1. From top to bottom, the frame 1 is fixed with a pretreatment feeding mechanism 2, a multi-stage crushing and screening mechanism 3, a quantitative feeding and mixing mechanism 4, an adaptive pressing and molding mechanism 5, and a layered drying and curing mechanism 6. The bottom mechanical transmission assembly 7 links all moving parts through a transmission shaft and chain. The material is fed into the top feeding hopper 201, enters the crushing box 301 through the guide plate, and then enters the mixing box 406, the molding station, and the drying box in sequence, and finally outputs the finished product from the drying discharge platform 609.

[0021] The pre-treatment feeding mechanism 2 includes a feeding hopper 201, anti-blocking feed rollers 202, an inclined guide plate 203, feed roller supports, and a guide plate fixing frame. The feeding hopper 201 is bolted to the top crossbeam of the frame 1. Feed roller supports are symmetrically welded to the inner walls of the left and right sides of the feeding hopper 201. The two sets of anti-blocking feed rollers 202 are rotatably mounted inside the symmetrically arranged feed roller supports at both ends via bearings. The two sets of anti-blocking feed rollers 202 are arranged in parallel and can rotate in opposite directions. Multiple sets of arc-shaped feed teeth are uniformly and integrally formed on the outer wall of the anti-blocking feed rollers 202. The bottom outlet of the feeding hopper 201 is connected to the inclined guide plate 203. The inclined guide plate 203 is bolted to the frame 1 via the bottom guide plate fixing frame. The end of the inclined guide plate 203 extends directly above the feed inlet of the multi-stage crushing and screening mechanism 3, achieving precise material guidance and connection.

[0022] The multi-stage crushing and screening mechanism 3 includes a crushing box 301, a coarse crushing roller assembly 302, a spiral crushing tooth 303, a fine grinding chamber 304, an annular grinding tooth ring 305, a rotating grinding disc 306, an eccentric wheel vibration assembly 307, a vibrating screen 308, a return guide plate 309, and a collection bin 310. The crushing box 301 is fixed to the support in the middle of the frame 1. The coarse crushing roller assembly 302 is assembled in the upper feeding area of ​​the crushing box 301. Spiral crushing teeth 303 are evenly welded to the surfaces of the two rollers of the coarse crushing roller assembly 302. The fine grinding chamber 304 is integrally connected below the coarse crushing roller assembly 302. The annular grinding tooth ring 305 is fixedly embedded in the inner wall of the fine grinding chamber 304. The rotating grinding disc 306 is rotatably installed at the center of the fine grinding chamber 304. A vibrating screen 308 is horizontally arranged below the fine grinding chamber 304. An eccentric wheel vibration assembly 307 is connected to one side of the vibrating screen 308 and is fixed to the outer wall of the crushing chamber 301. A return guide plate 309 is welded obliquely above the vibrating screen 308. The high end of the return guide plate 309 is connected to the coarse material discharge end of the screen, and the low end extends to the feed side of the fine grinding chamber 304. A sealed collection bin 310 is connected below the vibrating screen 308. The collection bin 310 is fixedly connected to the bottom of the crushing chamber 301 through a flange.

[0023] The quantitative feeding and mixing mechanism 4 includes a quantitative feeding auger 401, an auger drive shaft 402, a curing agent storage bin 403, a mechanical discharge gate 404, a spiral spreading assembly 405, a mixing tank 406, a dual-shaft mixing main shaft 407, a bent-surface mixing paddle 408, a mixing outlet, and a feeding bracket. The quantitative feeding auger 401 is fixed to the bottom of the collection bin 310 by the feeding bracket. The auger drive shaft 402 runs through the inside of the quantitative feeding auger 401 and is linked to the mechanical transmission assembly 7. The discharge end of the quantitative feeding auger 401 is connected to the upper left inlet of the mixing tank 406. The curing agent storage silo 403 is vertically fixed to the top center of the mixing tank 406 by a bracket. A mechanical discharge gate 404 is installed at the bottom outlet of the curing agent storage silo 403. A spiral spreading component 405 is installed below the mechanical discharge gate 404 and is rotatably mounted on the top inner wall of the mixing tank 406. Two sets of dual-shaft mixing spindles 407 are installed in parallel and rotatably inside the mixing tank 406. Multiple sets of staggered, bent-surface mixing paddles 408 are evenly welded to the outer wall of each set of dual-shaft mixing spindles 407. The two sets of dual-shaft mixing spindles 407 rotate synchronously in opposite directions. A mixing outlet is opened at the bottom center of the mixing tank 406, which connects to the adaptive pressing and molding mechanism 5 below.

[0024] The adaptive pressing and molding mechanism 5 includes a molding frame 501, a molding mold base 502, brick and tile molding cavities 503, a floating compaction plate 504, a spring mounting seat 505, an elastic adaptive pressure spring 506, a cam drive shaft 507, a top material cam 508, a top material plate 509, and a molding discharge conveyor belt 510. The molding frame 501 is fixed to the frame 1 below the mixing tank 406. The molding mold base 502 is fixedly embedded in the middle of the molding frame 501. Multiple sets of standard brick and tile molding cavities 503 are arrayed inside the molding mold base 502. The floating compaction plate 504 is arranged correspondingly above the molding mold base 502. The top of the floating compaction plate 504 is connected to the spring mounting seat 505 through multiple sets of evenly distributed elastic adaptive pressure springs 506. The spring mounting seat 505 is bolted to the top crossbeam of the molding frame 501. A cam drive shaft 507 is rotatably mounted below the forming mold base 502. Multiple sets of ejector cams 508 are fixedly sleeved on the outer wall of the cam drive shaft 507. An ejector plate 509 is correspondingly attached above the ejector cams 508. The ejector plate 509 is vertically slidably mounted at the bottom of the cavity inside the forming mold base 502. A forming discharge conveyor belt 510 is horizontally arranged on the side of the forming mold base 502 to receive the ejected brick blanks and transport them to the drying mechanism.

[0025] The layered drying and curing mechanism 6 includes a sealed drying chamber 601, a chamber support 602, a hot air guiding cavity 603, a porous hot air guiding plate 604, a waste heat return cavity 605, a waste heat return pipe 606, a multi-layer breathable bearing mesh belt 607, a mesh belt drive roller 608, and a drying discharge platform 609. The sealed drying chamber 601 is fixed to the side frame of the forming frame 501 by the chamber support 602. The bottom of the sealed drying chamber 601 is sealed with a hot air guiding cavity 603, and the top of the hot air guiding cavity 603 is covered with a porous hot air guiding plate 604. The waste heat return cavity 605 is set on the inner side of the top of the sealed drying chamber 601. The waste heat return cavity 605 is connected to the bottom hot air guiding cavity 603 through multiple sets of waste heat return pipes 606 to form a heat circulation structure. Inside the sealed drying chamber 601, three layers of multi-layer breathable bearing mesh belts 607 are horizontally arranged from top to bottom. Each layer of multi-layer breathable bearing mesh belt 607 has mesh belt drive rollers 608 sleeved at both ends, and the mesh belt drive rollers 608 are linked to the mechanical transmission component 7. The outer end of the sealed drying chamber 601 is connected to the drying discharge platform 609 for outputting the dried and shaped brick and tile products.

[0026] The mechanical transmission assembly 7 includes a drive motor 701, a main drive shaft, a reduction gear set, a chain drive mechanism, a driven drive shaft, and a synchronous drive sprocket. The drive motor 701 is fixed to the bottom of the frame 1, and its output end is connected to the main drive shaft. The main drive shaft is equipped with a reduction gear set to achieve speed regulation. The main drive shaft is connected to the driven drive shafts of each mechanism through multiple chain drive mechanisms. A synchronous drive sprocket is fixedly mounted at the end of each driven drive shaft. The synchronous mechanical linkage of the entire mechanism, including feeding, crushing, mixing, molding, and drying, is achieved through the cooperation of the sprockets and chains.

[0027] like Figure 6 As shown, construction waste, soft soil, silty soil and other materials are fed into the feed hopper 201. The opposing rotating anti-blocking material-dispersing rollers 202 mechanically disperse the sticky materials through the arc-shaped material-dispersing teeth to prevent soft soil and silty soil from sticking and blocking. The materials are uniformly introduced into the crushing box 301 through the inclined guide plate 203. First, the coarse crushing roller group 302 and the spiral crushing teeth 303 complete the crushing of blocky waste and the dispersion of loose soil. Then, the materials fall into the fine grinding chamber 304, where the annular grinding tooth ring 305 and the rotating grinding disc 306 cooperate to complete the fine grinding operation.

[0028] The ground material falls onto the vibrating screen 308, and the eccentric wheel vibration assembly 307 drives the screen to vibrate and screen at high frequency. Material with the required particle size passes through the screen and falls into the collection bin 310, while coarse material falls back to the fine grinding chamber 304 along the return guide plate 309 for secondary grinding, ensuring that the particle size of the material is uniform.

[0029] The qualified fine materials inside the collection bin 310 are uniformly conveyed to the mixing tank 406 by the quantitative feeding auger 401. At the same time, the solidifying agent storage bin 403 adjusts the discharge amount through the mechanical discharge gate 404, and the solidifying agent is evenly sprinkled into the mixing tank 406 through the spiral spreading component 405. Two sets of counter-rotating twin-shaft mixing main shafts 407 drive the bent surface mixing paddles 408 to agitate the material in multiple dimensions, completely eliminating the mixing dead corners and realizing the full integration of slag and solidifying agent.

[0030] The mixed solidified slag material falls from the mixing outlet into the brick and tile forming cavity 503 of the forming mold base 502. Under the mechanical elastic force of the elastic adaptive pressure spring 506, the floating compaction plate 504 adaptively adjusts the compaction pressure according to the material moisture content and density to complete the high-pressure compaction forming of the brick blank. After forming, the cam drive shaft 507 drives the top material cam 508 to rotate, lifts the top material plate 509 to push the brick blank out of the cavity, and is transported by the forming discharge conveyor belt 510 to the multi-layer breathable bearing mesh belt 607 inside the sealed drying box 601.

[0031] The brick blanks move slowly along the multi-layer breathable bearing mesh belt 607. Hot air permeates from the bottom of the brick blanks upward through the hot air guide cavity 603 and the porous hot air guide plate 604, achieving gradient drying from bottom to top. The residual heat at the top of the box is recycled through the residual heat return cavity 605 and the residual heat return pipe 606, ensuring that the moisture inside and outside the brick blanks evaporates evenly. After thorough curing and drying, high-strength recycled brick and tile products that are not easy to crack or deform are formed. Finally, the bricks are discharged from the drying discharge platform 609.

[0032] The entire machine integrates and fixes all mechanisms through the frame 1, and the various functional mechanisms achieve synchronous linkage through the mechanical transmission components 7. The entire process adopts a pure mechanical structure for operation, without any electronic control, intelligent sensing, or automatic adjustment components, resulting in strong structural stability.

[0033] When the pre-treatment feeding mechanism 2 is working, the two sets of anti-blocking material-pulling rollers 202 rotate in opposite directions under the drive of the transmission structure. They rely on the arc-shaped material-pulling teeth on the surface to break up the soft soil and silty soil materials that are stuck together, thus preventing the material from being blocked. The material falls at a uniform speed through the inclined guide plate 203 and is accurately fed into the multi-stage crushing and screening mechanism 3, ensuring the continuity and stability of the feeding.

[0034] When the multi-stage crushing and screening mechanism 3 is in operation, the coarse crushing roller group 302 works with the spiral crushing teeth 303 to crush the blocky slag. The material after initial crushing enters the fine grinding chamber 304, and fine grinding is achieved through the gap fit between the annular grinding tooth ring 305 and the rotating grinding disc 306. The eccentric wheel vibration component 307 drives the vibrating screen 308 to vibrate at high frequency. The 3mm aperture screen achieves accurate screening of materials. Unqualified coarse materials are automatically returned to the return guide plate 309 for secondary grinding, ensuring that the material falling into the collection bin 310 has a uniform particle size.

[0035] The quantitative feeding and mixing mechanism 4 achieves uniform and quantitative conveying of slag and soil through the quantitative feeding auger 401. The solidifying agent storage silo 403 manually adjusts the discharge flow rate through the mechanical discharge gate 404 to adapt to different slag and soil solidification ratio requirements. The solidifying agent is evenly spread into the mixing tank 406 through the spiral spreading component 405. Two sets of counter-rotating twin-shaft mixing main shafts 407 drive the bent surface mixing paddle 408 to form multi-dimensional material turbulence, completely eliminating mixing dead zones, allowing the solidifying agent and slag and soil materials to fully blend, and ensuring uniform and sufficient solidification reaction.

[0036] When the adaptive pressing and molding mechanism 5 is in operation, the material is filled into the brick and tile forming cavity 503 of the forming mold base 502. The elastic adaptive pressure spring 506 automatically adjusts the compression amount according to the softness and hardness of the material and the moisture content, so that the floating compaction plate 504 outputs the appropriate compaction pressure, avoiding the problem of soft soil brick blanks being crushed and dry soil brick blanks being insufficiently compacted. After compaction and molding, the cam drive shaft 507 drives the top material cam 508 to rotate, lifting the top material plate 509 to complete the automatic demolding of the brick blank, and then it is smoothly transported to the drying process by the forming discharge conveyor belt 510.

[0037] When the layered drying and curing mechanism 6 is working, the brick blanks are laid flat on the surface of the multi-layered breathable bearing mesh belt 607 and move slowly and uniformly. Hot air penetrates evenly upward from the bottom hot air guide cavity 603 through the porous hot air guide plate 604, achieving priority drying of the inside of the brick blanks. The residual heat at the top is returned to the bottom hot air system for recycling through the residual heat return cavity 605 and the residual heat return pipe 606, which not only reduces energy consumption but also forms a gradient drying effect. This effectively avoids cracking and deformation caused by surface drying and internal water accumulation in the brick blanks. The dried brick and tile products have uniform density and stable structural strength and can be directly used in various construction projects.

[0038] Therefore, the present invention adopts the above-mentioned method and device for the resource utilization of construction waste, which uses a frame as support and integrates pretreatment feeding, multi-stage crushing and screening, quantitative feeding and mixing, adaptive pressing and molding, and layered drying and curing mechanisms in sequence along the material flow direction. The entire process is synchronized and linked through mechanical transmission components. After the material is fed and dispersed, coarsely crushed and finely ground and screened and returned, it is fully mixed with the curing agent in a biaxial manner without dead angles. Then it is elastically and adaptively compacted and molded, and finally dried in a layered gradient with bottom air intake and waste heat circulation, continuously and stably producing high-strength recycled bricks and tiles that are not easy to crack and deform.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A device for the resource utilization of construction waste, characterized in that, The machine includes a frame, which integrates a pretreatment feeding mechanism, a multi-stage crushing and screening mechanism, a quantitative feeding and mixing mechanism, an adaptive pressing and forming mechanism, and a layered drying and curing mechanism in sequence from top to bottom along the material flow direction. The bottom of the frame is equipped with a mechanical transmission component, which is linked to the pretreatment feeding mechanism, the multi-stage crushing and screening mechanism, the quantitative feeding and mixing mechanism, the adaptive pressing and forming mechanism, and the layered drying and curing mechanism through a drive shaft and a chain.

2. The device for resource utilization of construction waste according to claim 1, characterized in that, The pre-treatment feeding mechanism includes a feeding hopper, anti-blocking feeding rollers, and an inclined guide plate. The feeding hopper is fixed to the top of the frame. Two sets of opposing anti-blocking feeding rollers are symmetrically rotated on the inner wall of the feeding hopper. The outer wall of the anti-blocking feeding rollers is provided with arc-shaped feeding teeth. The bottom outlet of the feeding hopper is connected to the inclined guide plate. The end of the inclined guide plate extends to directly above the feed inlet of the multi-stage crushing and screening mechanism.

3. The device for resource utilization of construction waste according to claim 2, characterized in that, The multi-stage crushing and screening mechanism includes a crushing box, with a coarse crushing roller group on the upper part of the crushing box and spiral crushing teeth on the surface of the coarse crushing roller group; the coarse crushing roller group is connected to a fine grinding chamber below, with an annular grinding tooth ring fixed on the inner wall of the fine grinding chamber and a rotating grinding disc mounted at the center. A vibrating screen is horizontally installed below the fine grinding chamber, and the vibrating screen is connected to an eccentric wheel vibration assembly; a return guide plate is inclinedly installed above the vibrating screen, with the high end of the return guide plate connecting to the coarse material discharge end of the screen and the low end extending to the feed side of the fine grinding chamber; a collection bin is sealed and connected below the vibrating screen.

4. The device for resource utilization of construction waste according to claim 2, characterized in that, The quantitative feeding and mixing mechanism includes a quantitative feeding auger, a curing agent storage silo, and a mixing chamber. The quantitative feeding auger is connected to the bottom of the collection silo, and the auger's discharge end is connected to the mixing chamber. The curing agent storage silo is vertically fixed to the top of the mixing chamber, and a mechanical discharge gate is provided at the bottom. A spiral spreading component is correspondingly installed below the gate. Two sets of counter-rotating and synchronously rotating dual-shaft mixing main shafts are installed in parallel within the mixing chamber. The outer wall of the main shaft is provided with staggered and bent surface mixing paddles. A mixing discharge port is opened at the bottom of the mixing chamber to connect to an adaptive pressing and molding mechanism.

5. A construction waste resource utilization device according to claim 4, characterized in that, The adaptive pressing and molding mechanism includes a molding frame and a molding die base. The molding die base has an array of brick and tile molding cavities. A floating compaction plate is set directly above the molding die base. The floating compaction plate is connected to a spring mounting seat through an elastic adaptive pressure spring. The spring mounting seat is fixed to the top of the molding frame. A cam drive shaft is rotated and assembled below the molding die base. The cam drive shaft is sleeved with a top material cam. The top material cam is attached to a top material plate. The top material plate is vertically slidably assembled at the bottom of the cavity. A molding discharge conveyor belt is set on the side of the molding die base. The molding discharge conveyor belt is connected to a layered drying and curing mechanism.

6. The device for resource utilization of construction waste according to claim 5, characterized in that, The layered drying and curing mechanism includes a sealed drying chamber with a hot air guide cavity at the bottom and a porous hot air guide plate on top of the guide cavity; a waste heat return cavity is located on the inner side of the top of the chamber, which is connected to the bottom hot air guide cavity through a waste heat return pipe to form a circulation; multiple layers of breathable bearing mesh belts are horizontally arranged from top to bottom inside the drying chamber, and the mesh belts are connected to mesh belt drive rollers; the end of the chamber is connected to the drying discharge platform.

7. A method for the resource utilization of construction waste, based on the construction waste resource utilization device according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Material pretreatment: Construction waste is put into the feed hopper, and the adhering materials are broken up by the anti-blocking material roller. The inclined guide plate then feeds the material into the multi-stage crushing and screening mechanism at a uniform speed. S2. Multi-stage crushing and screening: After being coarsely crushed by the coarse crushing roller group, the material enters the fine grinding chamber for fine grinding, and then is screened by the vibrating screen. The qualified fine material enters the collection bin, and the coarse particles are returned to the reflux guide plate for secondary grinding. S3. Quantitative mixing: Qualified fine materials are fed into the mixing tank by a quantitative feeding auger, and the curing agent is evenly sprinkled in by a spiral sprinkling component. The dual-shaft reverse mixing paddle mixes without dead corners. S4. Adaptive pressing molding: The mixed materials fall into the molding cavity, the floating compaction plate adapts to the pressure adjustment molding with the help of the elastic spring, and the cam pushes out the brick blank and conveys it to the drying process. S5. Layered Gradient Drying: The brick blanks move in multiple layers of breathable mesh belts, and hot air is used for gradient drying from bottom to top. The waste heat is recycled and reused. After drying, recycled brick and tile products are output.

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