Recycled aggregate preparation method based on construction waste recycling

Abstract

The invention discloses a recycled aggregate preparation method based on construction waste reutilization, and relates to the technical field of building materials, and the recycled aggregate preparation method comprises the following steps: crushing construction waste to obtain primary aggregate, then separating the primary aggregate through a magnetic separation device, and removing metal through magnetic separation to avoid subsequent damage to aggregate processing equipment; the primary aggregate is crushed again, and then the aggregate is ground and collided; the vibrating screen is used for screening the recycled aggregates according to different particle sizes, the recycled aggregates with different particle sizes are conveniently classified and utilized according to needs by screening the recycled aggregates according to different particle sizes, waste is reduced, and the market applicability of the recycled aggregates is improved; through cooperation of the magnetic separation device, metal in the aggregate is efficiently removed, and the recycled aggregate prepared through the method is higher in quality.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a method for preparing recycled aggregate based on the recycling of construction waste. Background Art

[0002] Using construction waste to prepare recycled aggregates is an environmentally friendly and resource-efficient process. Since there are more metals in construction waste, if the metals are not removed, the recycled quality of the aggregates will be affected.

[0003] The magnetic roller separator is a common magnetic separation device. Its main structure is very similar to the conveyor belt conveying component, except that one of the conveyor belt rollers is replaced by a magnetic roller. After the aggregate moves to the position of the magnetic roller on the conveyor belt, the metal will be magnetically adsorbed and continue to rotate downward along the conveyor belt, while the aggregate will be directly thrown out of the conveyor belt under the action of inertia and gravity, thereby achieving the effect of magnetic separation.

[0004] However, this magnetic separation method has certain defects. First, in order to ensure that the magnetism of the magnetic roller can stably adsorb the metal, the overall conveying speed of the conveyor belt is slow, and the aggregate will also be blocked by the metal, resulting in the kinetic energy of the aggregate being small when separated from the conveyor belt, resulting in the aggregate not being able to fly out of the conveyor belt, and the aggregate will continue to move down with the conveyor belt. Finally, this part of the aggregate and the metal are discharged through the same channel, resulting in poor separation effect; secondly, the current magnetic roller magnetic separator cannot guarantee the accumulation thickness of the aggregate on the conveyor belt. If the thickness is small, it will lead to poor work efficiency. If the thickness is large, the metal cannot be completely separated, reducing the metal removal effect. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing recycled aggregate based on the recycling of construction waste, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for preparing recycled aggregate based on the recycling of construction waste, comprising the following steps: Step 1: Use hammer crushing equipment to crush the construction waste to obtain preliminary aggregates, and then use a magnetic separation device to separate metals and aggregates; Step 2: Put the preliminary aggregate into the jaw crusher for crushing again, and then grind and collide the aggregate through the eccentric rotating equipment to remove the mortar and cement slurry on the surface of the aggregate; Step 3:

[0007] Preferably, the magnetic separation device comprises: A conveying mechanism, wherein the conveying mechanism is used to move the preliminary aggregate; The first magnetic separation mechanism, which is connected to the conveying mechanism; The power mechanism, which is used to increase the kinetic energy of the preliminary aggregate at the position of the first magnetic separation mechanism; The second magnetic separation mechanism, which is used to perform magnetic separation on the preliminary aggregate during the conveying process.

[0008] Preferably, the conveying mechanism includes: The box body, inside which the first magnetic separation mechanism is rotatably arranged; The first roller, which is rotatably arranged inside the box body; The first conveyor belt, which is drivably arranged between the first roller and the first magnetic separation mechanism.

[0009] Preferably, the first magnetic separation mechanism includes: The rotating cylinder, which is rotatably arranged inside the box body, and the power mechanism is arranged inside the rotating cylinder; The magnetic strips, which are fixedly connected to the inner wall of the rotating cylinder at intervals; The first sliding material plate, which is inclinedly arranged inside the box body; The second sliding material plate, which is inclinedly arranged inside the box body.

[0010] Preferably, the power mechanism includes: The first fixed cylinder, which is arranged inside the box body, the first fixed cylinder is inserted into the rotating cylinder, the magnetic strips are arranged between the rotating cylinder and the first fixed cylinder, and the outer wall of the first fixed cylinder is provided with a first slot; The second fixed cylinder, which is fixedly connected to the inner wall of the first fixed cylinder, and the outer wall of the second fixed cylinder is provided with a second slot; The connecting piece, which is fixedly connected between the outer wall of the first fixed cylinder and the inner wall of the second fixed cylinder, and the connecting piece is symmetrically arranged on both sides of the first slot and the second slot; The communication holes, which are arranged at intervals on the outer wall of the rotating cylinder, and the positions of the communication holes correspond to the gaps between adjacent magnetic strips; The partition strips, which are fixedly connected between the first fixed cylinder and the second fixed cylinder, and the partition strips divide the space between the first fixed cylinder, the second fixed cylinder and the two connecting pieces into two piston chambers; The piston plates, which are respectively slidably arranged on the inner walls of the two piston chambers, the two piston plates are arranged in a staggered manner, and one side of the piston plate is provided with a moving mechanism; The first one-way valves, which are respectively installed on the inner walls of the two piston chambers, and the first one-way valves are used for the outside air to enter the piston chambers; A second one-way valve, which is respectively installed on the outer wall of the second fixed cylinder, and is used for the air in the piston chamber to enter the inside of the second fixed cylinder.

[0011] Preferably, the moving mechanism includes: A bidirectional lead screw, which is rotatably arranged inside the piston chamber, and a first connecting mechanism is arranged between the bidirectional lead screw and the rotating cylinder; A nut seat, the outer part of the bidirectional lead screw is threadedly connected with the inner wall of the nut seat; A connecting pipe, one side of the connecting pipe is fixedly connected with one side of the nut seat, and the other side of the connecting pipe is fixedly connected with one side of the piston plate; A limiting disc, which is fixedly connected to one end of the bidirectional lead screw close to the piston plate. A plurality of first ball holes are formed in the outer wall of the limiting disc, and a first rolling ball is movably clamped in the inner wall of the first ball hole. The outer wall of the first rolling ball is attached to the inner wall of the connecting pipe.

[0012] Preferably, the first connecting mechanism includes: A rotating shaft, a fixing plate is fixedly connected to the inner wall of the first fixed cylinder, the rotating shaft is rotatably inserted and connected to one side of the fixing plate, and one end of the bidirectional lead screw far from the piston plate is fixedly connected to one end of the rotating shaft; A gear, which is fixedly sleeved on the end of the rotating shaft; An internal gear ring, which is fixedly connected to the inner wall of the magnetic strip, and the inner wall of the internal gear ring is meshed with the outer wall of the gear.

[0013] Preferably, the second magnetic separation mechanism includes: A magnetic roller, which is rotatably connected to the inner wall of the box body. A first servo motor is installed on the outer wall of the box body, and the output end of the first servo motor is drivingly connected to one end of the magnetic roller. An adjusting mechanism is arranged below the magnetic roller; A rotating rod, which is rotatably connected to the inner wall of the box body, and bristles are arranged on the outer wall of the rotating rod; A first sprocket, the other end of the magnetic roller penetrates through the inner wall of the box body and is fixedly sleeved with a first sprocket, one end of the rotating rod penetrates through the inner wall of the box body and is fixedly sleeved with a second sprocket, a chain is drivingly connected between the first sprocket and the second sprocket, and a first protective frame is fixedly connected to the outer wall of the box body; A second rotating roller, which is symmetrically rotatably connected to the inner wall of the box body, a second conveyor belt is drivingly connected between the two second rotating rollers, and a second connecting mechanism is arranged between the second rotating roller and the connecting piece; A scraper, which is fixedly connected to the outer wall of the second conveyor belt at intervals; An arc-shaped baffle, which is fixedly connected to the inner wall of the box body; The third sliding material plate is obliquely and fixedly connected to the inner wall of the box body.

[0014] Preferably, the adjusting mechanism includes: A connecting frame. A sliding groove is provided on the inner wall of the box body. The outer wall of the connecting frame is slidably connected to the inner wall of the sliding groove. The rotating cylinder is rotatably connected to the inner wall of the connecting frame. The first fixed cylinder is fixedly inserted through the inner wall of the connecting frame. A telescopic cylinder. The telescopic cylinder is installed at the bottom end of the box body. The output end of the telescopic cylinder penetrates through the bottom end of the box body and is drivingly connected to the bottom end of the connecting frame.

[0015] Preferably, the second connecting mechanism includes: A second protective frame, which is fixedly connected to the outer wall of the box body; A first worm gear. One end of the second roller penetrates through the inner wall of the box body and is fixedly connected to one side of the first worm gear. A first fixed block is fixedly connected to the outer wall of the box body. The bottom end of the first fixed block is rotatably inserted with a first worm. The outer wall of the first worm is meshed with the outer wall of the first worm gear; A second worm gear. One end of the rotating cylinder sequentially penetrates through the inner walls of the connecting frame and the box body and is fixedly connected to one side of the second worm gear. A connecting groove is provided on one side of the box body. The outer wall of the connecting frame at the position of the connecting groove is fixedly connected with a second fixed block. The top end of the second fixed block is rotatably connected with a second worm. The outer wall of the second worm gear is meshed with the inner wall of the second worm; A connecting cylinder, which is fixedly connected to the bottom end of the first worm. A square hole is provided at the bottom end of the connecting cylinder. A square rod is fixedly connected to the top end of the second worm. The square rod is inserted into the inner wall of the second spherical hole. A plurality of second spherical holes are provided on the outer wall of the square rod. The inner wall of the second spherical hole is movably clamped with a second rolling ball. The outer wall of the second rolling ball is attached to the inner wall of the square hole; A second servo motor, which is installed at the top end of the second protective frame. The output end of the second servo motor is drivingly connected to the top end of the first worm.

[0016] The technical effects and advantages of the present invention: (1) By virtue of the arrangement of the power mechanism in the present invention, when the piston plate moves towards the first one-way valve in the piston chamber, the air in the piston chamber enters the interior of the second fixed cylinder through the second one-way valve, and then is discharged successively through the second slotted opening and the first slotted opening. Since the position of the first fixed cylinder is fixed, the orientation of the first slotted opening can be made fixed, and the air discharged from the first slotted opening can be discharged through the communication hole at the corresponding position. Since the first conveyor belt is provided with air permeability, the air will blow towards the aggregate about to be separated from the surface of the first conveyor belt, causing the aggregate to be blown and increasing its kinetic energy, enabling the aggregate to fly out stably from the surface of the first conveyor belt, avoiding the phenomenon of the aggregate continuing to move along with the first conveyor belt, and this blowing force will not affect the magnetically adsorbed metal, thus ensuring the magnetic separation effect. (2) By virtue of the arrangement of the second magnetic separation mechanism in the present invention, through the blocking of the magnetic roller, the thickness of the aggregate passing between the first conveyor belt and the magnetic roller can be restricted, so that the aggregate will not move to the position of the first magnetic separation mechanism in excessive quantity at one time, ensuring the stable operation of the first magnetic separation mechanism. The magnetic roller rotates counterclockwise, so that when the aggregate passes between the magnetic roller and the first conveyor belt, the metal in the aggregate will be attracted by the magnetic force, enabling most of the metal to be directly adsorbed by the magnetic roller. Then, with the counterclockwise rotation of the magnetic roller, through the connection of the first sprocket, the chain and the second sprocket, the rotating rod can be driven to rotate counterclockwise. The counterclockwise rotating rod will drive the brush to rotate counterclockwise, causing the brush to continuously scrape the outside of the magnetic roller, so that the aggregate adsorbed by the magnetic roller can be scraped off by the brush and dropped into the first conveyor belt. However, the brush has a soft texture and is arranged sparsely, so that the brush will not affect the metal adsorbed by the magnetic roller, enabling the metal to stably rotate counterclockwise over the brush along with the magnetic roller. Until the metal rotates with the magnetic roller to the top of the magnetic roller, at this time, the two second rotating rollers drive the second conveyor belt to rotate clockwise, so that the scraper can scrape off the metal adsorbed by the magnetic roller and scrape it onto the arc-shaped baffle, and then move the metal together with the movement of the second conveyor belt until the metal moves above the third sliding plate, and then under the action of gravity, the metal drops from the second conveyor belt and falls into the third sliding plate and then slides out of the box body. And through the arrangement of the magnetic roller, the aggregate will be subjected to primary magnetic separation, and the magnetic roller is located above the first conveyor belt, so that the magnetic roller will adsorb the metal at the top of the aggregate pile on the surface of the first conveyor belt. Combined with the arrangement of the first magnetic separation mechanism, the two magnetic separations can stably separate the metal in the aggregate. (3) By virtue of the arrangement of the adjusting mechanism and the second connecting mechanism in the present invention, when the telescopic cylinder works to drive the connecting frame to rise and fall, the first conveyor belt can be driven to rise and fall, thereby adjusting the distance between the first conveyor belt and the magnetic roller, and thus changing the thickness of the material passing through, improving the applicability of the magnetic separation and sorting device. At the same time, with the cooperation of the second connecting mechanism, the operation of the first magnetic separation mechanism and the second magnetic separation mechanism is not affected, thus ensuring the stability of the operation of the magnetic separation device. Brief Description of the Drawings

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention.

[0018] Figure 2 This is a side sectional structural schematic diagram of the present invention.

[0019] Figure 3 This is a front sectional structural schematic diagram of the present invention.

[0020] Figure 4 This is a front sectional structural schematic diagram of the rotating cylinder of the present invention.

[0021] Figure 5 This is a side sectional structural schematic diagram of the rotating cylinder of the present invention.

[0022] Figure 6 This is a three-dimensional structural schematic diagram of the first fixed cylinder of the present invention.

[0023] Figure 7 For the present invention Figure 4 Partial enlarged structural schematic diagram at location A.

[0024] Figure 8 For the present invention Figure 4 Partial enlarged structural schematic diagram at location B.

[0025] Figure 9 This is a side sectional structural schematic diagram of the first protective frame of the present invention.

[0026] Figure 10 This is a side sectional structural schematic diagram of the connecting cylinder of the present invention.

[0027] In the figure: 101, box body; 201, first rotating roller; 202, first conveyor belt; 203, first material sliding plate; 204, second material sliding plate; 205, rotating cylinder; 206, magnetic strip; 301, first fixed cylinder; 302, first slotted opening; 303, second fixed cylinder; 304, second slotted opening; 305, connecting piece; 306, communication hole; 307, partition bar; 308, piston plate; 309, first one-way valve; 310, second one-way valve; 311, bidirectional lead screw; 312, nut seat; 313, connecting pipe; 314, limiting disc; 315, first ball hole; 316, first ball; 317, fixing plate; 318, rotating shaft; 319, gear; 320, internal gear ring; 401, magnetic roller; 402, first servo motor; 403, rotating rod; 404, brush hair; 405, first sprocket; 406, second sprocket; 407, chain; 408, first protective frame; 501, second rotating roller; 502, second conveyor belt; 503, scraping plate; 504, arc-shaped baffle; 505, third material sliding plate; 601, connecting frame; 602, telescopic cylinder; 603, second protective frame; 604, first worm gear; 605, second worm gear; 606, first fixing block; 607, first worm; 608, connecting groove; 609, second fixing block; 610, second worm; 611, connecting cylinder; 612, square hole; 613, square rod; 614, second ball hole; 615, second ball; 616, second servo motor. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0029] The present invention provides a method for preparing recycled aggregates based on the recycling of construction waste as shown in Figures 1 - 10 the following, including the following steps: Step 1: Use a hammer crushing device to crush the construction waste to obtain preliminary aggregates, and then separate the metal from the aggregates through a magnetic separation device, and remove the metal by magnetic separation to avoid damage to the subsequent aggregate processing equipment; Step 2: Put the preliminary aggregates into a jaw crusher for crushing again, and then grind and collide the aggregates through an eccentric rotating device to remove the mortar and cement slurry on the surface of the aggregates; Step 3: Use a vibrating screen to screen the recycled aggregates according to different particle sizes. By screening the recycled aggregates according to different particle sizes, it is convenient to classify and utilize the recycled aggregates with different particle sizes as needed, reduce waste, and improve the market applicability of the recycled aggregates.

[0030] As a further solution of the present invention, the magnetic separation device includes a conveying mechanism, a first magnetic separation mechanism, a power mechanism and a second magnetic separation mechanism. The conveying mechanism is used to move the preliminary aggregate. The first magnetic separation mechanism is connected to the conveying mechanism. The power mechanism is used to increase the kinetic energy of the preliminary aggregate at the position of the first magnetic separation mechanism. The second magnetic separation mechanism is used to magnetically separate the preliminary aggregate during the conveying process. The preliminary aggregate is conveyed by the conveying mechanism for magnetic separation. The second magnetic separation mechanism will perform an initial magnetic separation on the aggregate during the conveying process. The aggregate after magnetic separation will be moved to the first magnetic separation mechanism through the conveying mechanism for magnetic separation again. During this magnetic separation process, the power mechanism will provide kinetic energy for the aggregate, so that the aggregate can fly out of the conveying mechanism while the metal is adsorbed by the second magnetic separation mechanism.

[0031] Among them, the conveying mechanism includes a box body 101, a first roller 201 and a first conveyor belt 202. The first magnetic separation mechanism is rotatably arranged inside the box body 101, the first roller 201 is rotatably arranged inside the box body 101, the first conveyor belt 202 is transmission-arranged between the first roller 201 and the first magnetic separation mechanism, and a hopper is also provided above the first conveyor belt 202. Aggregates fall onto the surface of the first conveyor belt 202 through the hopper, and then the materials are transported by moving the first conveyor belt 202.

[0032] The first magnetic separation mechanism includes a rotating drum 205, a magnetic strip 206, a first sliding plate 203 and a second sliding plate 204. The rotating drum 205 is rotatably arranged inside the box 101, the power mechanism is arranged inside the rotating drum 205, the magnetic strip 206 is fixedly connected to the inner wall of the rotating drum 205 at intervals, the first sliding plate 203 is tilted inside the box 101, and the second sliding plate 204 is tilted inside the box 101. The aggregate on the first conveyor belt 202 moves to the position of the rotating drum 205. At this time, the metal It will be attracted by the magnetic force of the magnetic strip 206 and then continue to move along the arc of the outer wall of the rotating drum 205, while the aggregate will fall from the first conveyor belt 202 and be drawn out through the first sliding plate 203, wherein the top of the second sliding plate 204 is in contact with the outer wall of the first conveyor belt 202, so that after the metal is separated from the rotating drum 205 as the first conveyor belt 202 moves, even if the metal continues to be attracted to the first conveyor belt 202, it can be directly scraped off by the second sliding plate 204 and then discharged through the second sliding plate 204.

[0033] Among them, the power mechanism includes a first fixed cylinder 301, a second fixed cylinder 303, a connecting piece 305, a communication hole 306, a partition strip 307, a piston plate 308, a first one-way valve 309, and a second one-way valve 310. The first fixed cylinder 301 is arranged inside the box body 101. The first fixed cylinder 301 is inserted into the inside of the rotating cylinder 205. The magnetic strip 206 is arranged between the rotating cylinder 205 and the first fixed cylinder 301. The outer wall of the first fixed cylinder 301 is provided with a first slot 302. The second fixed cylinder 303 is fixedly connected to the inner wall of the first fixed cylinder 301. The outer wall of the second fixed cylinder 303 is provided with a second slot 304. The connecting piece 305 is fixedly connected between the outer wall of the first fixed cylinder 301 and the inner wall of the second fixed cylinder 303. The connecting piece 305 is symmetrically arranged on both sides of the first slot 302 and the second slot 304. The communication holes 306 are spacedly arranged on the outer wall of the rotating cylinder 205. The position of the communication holes 306 corresponds to the gap between adjacent magnetic strips 206. The partition strip 307 is fixedly connected between the first fixed cylinder 301 and the second fixed cylinder 303. The partition strip 307 divides the space between the first fixed cylinder 301, the second fixed cylinder 303 and the two connecting pieces 305 into two piston chambers. The piston plates 308 are respectively slidably arranged on the inner walls of the two piston chambers. The two piston plates 308 are arranged in a staggered manner. One side of the piston plate 308 is arranged on the moving mechanism. The first one-way valves 309 are respectively installed on the inner walls of the two piston chambers. The first one-way valves 309 are used for the outside air to enter the piston chambers. The second one-way valves 310 are respectively installed on the outer wall of the second fixed cylinder 303. The second one-way valves 310 are used for the air in the piston chambers to enter the inside of the second fixed cylinder 303. Since the position of the first fixed cylinder 301 is fixed, the opening direction of the first slot 302 can be made fixed. When the piston plate 308 moves towards the first one-way valve 309 in the piston chamber, the air in the piston chamber can enter the inside of the second fixed cylinder 303 through the second one-way valve 310, and then is discharged through the second slot 304 and the first slot 302 in sequence. Since the position of the first fixed cylinder 301 is fixed, the orientation of the first slot 302 can be made fixed. The air discharged from the first slot 302 can be discharged through the communication holes 306 at the corresponding positions. Since the first conveyor belt 202 is provided with air permeability, the air will blow towards the aggregate about to be separated from the surface of the first conveyor belt 202, causing the aggregate to be blown and increasing its kinetic energy, so that the aggregate can fly out stably from the surface of the first conveyor belt 202, avoiding the phenomenon that the aggregate continues to move with the first conveyor belt 202, and this blowing force will not affect the magnetically adsorbed metal, thus ensuring the magnetic separation effect. At the same time, the piston plates 308 in the two piston chambers move alternately. When one piston plate 308 moves in the opposite direction of the first one-way valve 309, the other piston plate 308 moves in the direction away from the first one-way valve 309. When the piston plate 308 moves in the direction away from the first one-way valve 309, the outside air can enter the inside of the piston chamber through the first one-way valve 309.Thus, the power mechanism can always maintain the air-blowing state, ensuring the stability of the operation of the power mechanism.

[0034] Among them, the moving mechanism includes a bidirectional lead screw 311, a nut seat 312, a connecting pipe 313, and a limiting disc 314. The bidirectional lead screw 311 is rotatably arranged inside the piston chamber. A first connection mechanism is provided between the bidirectional lead screw 311 and the rotating cylinder 205. The outer part of the bidirectional lead screw 311 is threadedly connected to the inner wall of the nut seat 312. One side of the connecting pipe 313 is fixedly connected to one side of the nut seat 312, and the other side of the connecting pipe 313 is fixedly connected to one side of the piston plate 308. The limiting disc 314 is fixedly connected to one end of the bidirectional lead screw 311 close to the piston plate 308. A plurality of first ball holes 315 are formed in the outer wall of the limiting disc 314. A first rolling ball 316 is movably clamped in the inner wall of the first ball hole 315. The outer wall of the first rolling ball 316 is in contact with the inner wall of the connecting pipe 313. The first connection mechanism includes a rotating shaft 318, a gear 319, and an internal gear ring 320. A fixed plate 317 is fixedly connected to the inner wall of the first fixed cylinder 301. The rotating shaft 318 is rotatably inserted through one side of the fixed plate 317. One end of the bidirectional lead screw 311 away from the piston plate 308 is fixedly connected to one end of the rotating shaft 318. The gear 319 is fixedly sleeved on the end of the rotating shaft 318. The internal gear ring 320 is fixedly connected to the inner wall of the magnetic strip 206. The inner wall of the internal gear ring 320 is meshed with the outer wall of the gear 319. The first fixed cylinder 301 is provided with an open end, and when the rotating cylinder 205 rotates, the first fixed cylinder 301 is stationary. When the rotating cylinder 205 rotates to drive the internal gear ring 320 to rotate, the internal gear ring 320 can drive the gear 319 to rotate. The rotation of the gear 319 can drive the rotating shaft 318 to rotate. The rotation of the rotating shaft 318 can drive the bidirectional lead screw 311 to rotate. The rotation of the bidirectional lead screw 311 can drive the nut seat 312 to move. Through the connection of the connecting pipe 313, the piston plate 308 can be made to move. When the nut seat 312 moves to contact the limiting disc 314, the nut seat 312 will automatically move in the reverse direction until the nut seat 312 contacts the fixed plate 317 again. At this time, the nut seat 312 moves in the reverse direction again, so that the one-way rotation of the bidirectional lead screw 311 can drive the piston plate 308 to perform continuous reciprocating movement, thus ensuring the stability of the operation of the power mechanism.

[0035] Among them, the second magnetic separation mechanism includes a magnetic roller 401, a rotating rod 403, a first sprocket 405, a second rotating roller 501, a scraper 503, an arc-shaped baffle 504, and a third material sliding plate 505. The magnetic roller 401 is rotatably connected to the inner wall of the box body 101. A first servo motor 402 is installed on the outer wall of the box body 101. The output end of the first servo motor 402 is drivingly connected to one end of the magnetic roller 401. An adjusting mechanism is arranged below the magnetic roller 401. The rotating rod 403 is rotatably connected to the inner wall of the box body 101. Brush hairs 404 are arranged on the outer wall of the rotating rod 403. The other end of the magnetic roller 401 penetrates through the inner wall of the box body 101 and is fixedly sleeved with a first sprocket 405. One end of the rotating rod 403 penetrates through the inner wall of the box body 101 and is fixedly sleeved with a second sprocket 406. A chain 407 is drivingly connected between the first sprocket 405 and the second sprocket 406. A first protective frame 408 is fixedly connected to the outer wall of the box body 101. The second rotating rollers 501 are symmetrically rotatably connected to the inner wall of the box body 101. A second conveyor belt 502 is drivingly connected between the two second rotating rollers 501. A second connecting mechanism is arranged between the second rotating roller 501 and the connecting piece 305. The scrapers 503 are fixedly connected to the outer wall of the second conveyor belt 502 at intervals. The arc-shaped baffle 504 is fixedly connected to the inner wall of the box body 101. The third material sliding plate 505 is obliquely fixedly connected to the inner wall of the box body 101. The magnetic roller 401 is directly located above the middle of the first conveyor belt 202. By blocking of the magnetic roller 401, the thickness of the aggregate passing between the first conveyor belt 202 and the magnetic roller 401 can be restricted, so that the aggregate will not move to the position of the first magnetic separation mechanism too much at one time, ensuring the stable operation of the first magnetic separation mechanism. The magnetic roller 401 rotates counterclockwise. When the aggregate passes between the magnetic roller 401 and the first conveyor belt 202, the metal in the aggregate will be attracted by the magnetic force, so that most of the metal can be directly adsorbed by the magnetic roller 401. Then, as the magnetic roller 401 rotates counterclockwise, through the connection of the first sprocket 405, the chain 407, and the second sprocket 406, the rotating rod 403 can be made to rotate counterclockwise. The rotating rod 403 rotating counterclockwise will drive the brush hairs 404 to rotate counterclockwise, so that the brush hairs 404 continuously scrape against the outside of the magnetic roller 401, and the aggregate adsorbed by the magnetic roller 401 can be scraped off by the brush hairs 404 and fall into the first conveyor belt 202. However, the brush hairs 404 are soft in texture and sparsely arranged, so that the brush hairs 404 will not affect the metal adsorbed by the magnetic roller 401, and the metal can stably rotate counterclockwise with the magnetic roller 401 and cross over the brush hairs 404. Until the metal rotates with the magnetic roller 401 to the top of the magnetic roller 401, at this time, the two second rotating rollers 501 drive the second conveyor belt 502 to rotate clockwise, so that the scraper 503 can scrape off the metal adsorbed by the magnetic roller 401 and scrape it onto the arc-shaped baffle 504. Then, as the second conveyor belt 502 moves, it drives the metal to move together until the metal moves above the third material sliding plate 505, and then under the action of gravity,The metal drops from the second conveyor belt 502 and falls into the third chute plate 505 and then slides out of the box body 101. And through the arrangement of the magnetic roller 401, primary magnetic separation of the aggregate is carried out. And the magnetic roller 401 is located above the first conveyor belt 202, so that the magnetic roller 401 will adsorb the metal at the top of the aggregate pile on the surface of the first conveyor belt 202. With the arrangement of the first magnetic separation mechanism, the two magnetic separations can stably separate the metal in the aggregate.

[0036] Among them, the adjusting mechanism includes a connecting frame 601 and a telescopic cylinder 602. A chute is provided on the inner wall of the box body 101. The outer wall of the connecting frame 601 is slidably connected to the inner wall of the chute. The rotating cylinder 205 is rotatably connected to the inner wall of the connecting frame 601. The first rotating roller 201 is also rotatably connected to the inner wall of the connecting frame 601. The first fixed cylinder 301 is fixedly inserted through the inner wall of the connecting frame 601. The telescopic cylinder 602 is installed at the bottom end of the box body 101. The output end of the telescopic cylinder 602 penetrates the bottom end of the box body 101 and is drivingly connected to the bottom end of the connecting frame 601. When the telescopic cylinder 602 works to drive the connecting frame 601 to rise and fall, the first conveyor belt 202 can be driven to rise and fall, so as to adjust the distance between the first conveyor belt 202 and the magnetic roller 401, thereby changing the thickness of the material passing through, improving the applicability of the magnetic separation and sorting device. And a support plate can be fixed on the inner wall of the connecting frame 601. The support plate is located below the magnetic roller 401. The first conveyor belt 202 passes through between the support plate and the magnetic roller 401, so as to avoid the phenomenon that the first conveyor belt 202 at the position of the magnetic roller 401 is deformed, so that the aggregate can stably pass through between the magnetic roller 401 and the first conveyor belt 202 at the required thickness. And air vents are provided on the outer wall of the box body 101. The positions of the air vents correspond to the positions of the first fixed cylinders 301, so that the outside air can stably enter the piston chamber through the first one-way valve 309.

[0037] Among them, the second connecting mechanism includes a second protective frame 603, a first worm gear 604, a second worm gear 605, a connecting cylinder 611 and a second servo motor 616. The second protective frame 603 is fixedly connected to the outer wall of the box body 101. One end of the second roller 501 penetrates through the inner wall of the box body 101 and is fixedly connected to one side of the first worm gear 604. A first fixing block 606 is fixedly connected to the outer wall of the box body 101. A first worm 607 is rotatably inserted through the bottom end of the first fixing block 606. The outer wall of the first worm 607 is meshed with the outer wall of the first worm gear 604. One end of the rotary cylinder 205 penetrates through the inner walls of the connecting frame 601 and the box body 101 in sequence and is fixedly connected to one side of the second worm gear 605. A connecting groove 608 is formed in one side of the box body 101. A second fixing block 609 is fixedly connected to the outer wall of the connecting frame 601 at the position of the connecting groove 608. A second worm 610 is rotatably connected to the top end of the second fixing block 609. The outer wall of the second worm gear 605 is meshed with the inner wall of the second worm 610. The connecting cylinder 611 is fixedly connected to the bottom end of the first worm 607. A square hole 612 is formed in the bottom end of the connecting cylinder 611. A square rod 613 is fixedly connected to the top end of the second worm 610. The square rod 613 is inserted through the inner wall of the second ball hole 614. A plurality of second ball holes 614 are formed in the outer wall of the square rod 613. A second ball 615 is movably clamped in the inner wall of the second ball hole 614. The outer wall of the second ball 615 is attached to the inner wall of the square hole 612. The second servo motor 616 is installed on the top end of the second protective frame 603. The output end of the second servo motor 616 is drivingly connected to the top end of the first worm 607. By inserting the square rod 613 into the square hole 612, the first worm 607 and the second worm 610 can rotate simultaneously. Thus, when the second servo motor 616 works, the first worm gear 604 and the second worm gear 605 can rotate simultaneously, so that the second roller 501 and the rotary cylinder 205 can rotate clockwise simultaneously, enabling two groups of rotations with only one drive, reducing the equipment cost. When the telescopic cylinder 602 works to drive the connecting frame 601 to perform lifting adjustment, the square rod 613 can move longitudinally in the telescopic cylinder 602, but the square rod 613 will not separate from the square hole 612, thereby ensuring that the first worm 607 and the second worm 610 can rotate simultaneously. And through the arrangement of the second ball 615, the movement of the square rod 613 in the square hole 612 is smoother, thus ensuring the smooth operation of the equipment. And through the arrangement of the connecting groove 608, the lifting of the connecting frame 601 is not affected, thereby ensuring the stable operation of the magnetic separation device.

[0038] During operation, the first conveyor belt 202 drives the aggregate thereon to move. When the aggregate moves to the position of the magnetic roller 401, the aggregate will be blocked and then pass through the magnetic roller 401 and the first conveyor belt 202 within the limited thickness range. Most of the metal in the aggregate will be adsorbed by the magnetic roller 401 and rotate counterclockwise. At the same time, the rotating rod 403 drives the brush 404 to rotate counterclockwise, scraping the aggregate attached to the surface of the brush 404 back onto the first conveyor belt 202, while the metal passes over the brush 404 and continues to rotate upward. At this time, the second roller 501 drives the second conveyor belt 502 to rotate counterclockwise, so that the scraper 503 scrapes the metal adsorbed on the surface of the magnetic roller 401 onto the arc-shaped baffle 504, and then moves along with the second conveyor belt 502 until it finally falls onto the third slide plate 505 and is discharged from the box body 101. The aggregate and part of the metal on the first conveyor belt 202 continue to move until the aggregate moves to the position of the rotating drum 205. At this time, the metal will be adsorbed by the magnetic force of the magnetic strip 206, so that the metal is adsorbed on the outer wall of the first conveyor belt 202 in contact with the rotating drum 205. Then the metal continues to rotate with the first conveyor belt 202 until the metal contacts the second slide plate 204 and is scraped off, and then slides out of the box body 101 through the second slide plate 204. When the rotating drum 205 rotates, it drives the internal gear ring 320 to rotate. The internal gear ring 320 can drive the gear 319 to rotate. The rotation of the gear 319 can drive the rotating shaft 318 to rotate. The rotation of the rotating shaft 318 can drive the bidirectional lead screw 311 to rotate. The rotation of the bidirectional lead screw 311 can drive the nut seat 312 to move. Through the connection of the connecting pipe 313, the piston plate 308 can be made to move. When the nut seat 312 moves to contact the limit disk 314, the nut seat 312 will automatically move in the reverse direction until the nut seat 312 contacts the fixed plate 317 again. At this time, the nut seat 312 moves in the reverse direction again, so that the single-direction rotation of the bidirectional lead screw 311 can drive the piston plate 308 to perform continuous reciprocating movement. When the piston plate 308 moves towards the first one-way valve 309 in the piston chamber, the air in the piston chamber enters the inside of the second fixed cylinder 303 through the second one-way valve 310, and then is discharged through the second slot 304 and the first slot 302 in sequence. Since the position of the first fixed cylinder 301 is fixed, the orientation of the first slot 302 can be fixed. The air discharged from the first slot 302 can be discharged through the communication hole 306 at the corresponding position. Since the first conveyor belt 202 is provided with air permeability, the air will blow towards the aggregate about to be separated from the surface of the first conveyor belt 202, causing the aggregate to be blown and increasing its kinetic energy, so that the aggregate can fly out stably from the surface of the first conveyor belt 202 and then fall onto the first slide plate 203 and slide out of the box body 101. The first servo motor 402, the telescopic cylinder 602 and the second servo motor 616 are respectively electrically connected to the external power supply through external switches, which is convenient for the operator to control them, improving the safety and convenience of the operation.

[0039] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation method of recycled aggregate based on the recycling of construction waste, characterized in that, It includes the following steps: Step 1: Use a hammer crushing device to crush construction waste to obtain preliminary aggregates, and then separate metals from the aggregates through a magnetic separation device; Step 2: Put the preliminary aggregates into a jaw crusher for further crushing, and then use an eccentric rotating device to grind and collide the aggregates to remove the mortar and cement slurry on the surface of the aggregates; Step 3: Use a vibrating screen to screen the recycled aggregates according to different particle sizes.

2. The preparation method of recycled aggregate based on the recycling of construction waste according to claim 1, characterized in that, The magnetic separation device includes: A conveying mechanism for moving the preliminary aggregates; A first magnetic separation mechanism connected to the conveying mechanism; A power mechanism for increasing the kinetic energy of the preliminary aggregates at the position of the first magnetic separation mechanism; A second magnetic separation mechanism for magnetic separation of the preliminary aggregates during the conveying process.

3. A method for preparing recycled aggregate based on the recycling of construction waste according to claim 2, wherein The conveying mechanism includes: A box body (101), and the first magnetic separation mechanism is rotatably arranged inside the box body (101); A first roller (201) rotatably arranged inside the box body (101); A first conveyor belt (202) drivingly arranged between the first roller (201) and the first magnetic separation mechanism.

4. A preparation method of recycled aggregate based on the reuse of construction waste according to claim 3, characterized in that, The first magnetic separation mechanism includes: A rotating drum (205) rotatably arranged inside the box body (101), and the power mechanism is arranged inside the rotating drum (205); Magnetic strips (206) fixedly connected to the inner wall of the rotating drum (205) at intervals; A first sliding plate (203) inclinedly arranged inside the box body (101); A second sliding plate (204) inclinedly arranged inside the box body (101).

5. A method for preparing recycled aggregate based on the reuse of construction waste according to claim 4, characterized in that, The power mechanism includes: A first fixed cylinder (301) arranged inside the box body (101), the first fixed cylinder (301) is inserted into the inside of the rotating drum (205), the magnetic strips (206) are arranged between the rotating drum (205) and the first fixed cylinder (301), and a first slot (302) is opened on the outer wall of the first fixed cylinder (301); A second fixed cylinder (303) fixedly connected to the inner wall of the first fixed cylinder (301), and a second slot (304) is opened on the outer wall of the second fixed cylinder (303); A connecting piece (305) fixedly connected between the outer wall of the first fixed cylinder (301) and the inner wall of the second fixed cylinder (303), and the connecting piece (305) is symmetrically arranged on both sides of the first slot (302) and the second slot (304); Communication holes (306) are opened at intervals on the outer wall of the rotating drum (205), and the positions of the communication holes (306) correspond to the gaps between adjacent magnetic strips (206); A partition bar (307) is fixedly connected between the first fixed cylinder (301) and the second fixed cylinder (303). The partition bar (307) divides the space between the first fixed cylinder (301), the second fixed cylinder (303) and the two connecting pieces (305) into two piston chambers; Piston plates (308) are respectively slidably arranged on the inner walls of the two piston chambers. The two piston plates (308) are arranged in a staggered manner. One side of the piston plate (308) is provided with a moving mechanism; First one-way valves (309) are respectively installed on the inner walls of the two piston chambers. The first one-way valves (309) are used for outside air to enter the piston chambers; Second one-way valves (310) are respectively installed on the outer wall of the second fixed cylinder (303). The second one-way valves (310) are used for the air in the piston chambers to enter the inside of the second fixed cylinder (303).

6. The preparation method of recycled aggregate based on the reuse of construction waste according to claim 5, characterized in that, The moving mechanism includes: A bidirectional lead screw (311) is rotatably arranged inside the piston chamber. A first connecting mechanism is provided between the bidirectional lead screw (311) and the rotating cylinder (205); A nut seat (312) is threadedly connected to the inner wall of the outer part of the bidirectional lead screw (311); A connecting pipe (313) has one side fixedly connected to one side of the nut seat (312), and the other side of the connecting pipe (313) is fixedly connected to one side of the piston plate (308); A limit disk (314) is fixedly connected to one end of the bidirectional lead screw (311) close to the piston plate (308). A plurality of first ball holes (315) are formed in the outer wall of the limit disk (314). A first rolling ball (316) is movably clamped in the inner wall of the first ball hole (315). The outer wall of the first rolling ball (316) is in fit with the inner wall of the connecting pipe (313).

7. A preparation method of recycled aggregate based on the reuse of construction waste according to claim 6, characterized in that, The first connecting mechanism includes: A rotating shaft (318). A fixing plate (317) is fixedly connected to the inner wall of the first fixed cylinder (301). The rotating shaft (318) is rotatably inserted and connected to one side of the fixing plate (317). One end of the bidirectional lead screw (311) far from the piston plate (308) is fixedly connected to one end of the rotating shaft (318); A gear (319) is fixedly sleeved on the end of the rotating shaft (318); An internal gear ring (320) is fixedly connected to the inner wall of the magnetic strip (206). The inner wall of the internal gear ring (320) is meshed with the outer wall of the gear (319).

8. A method for preparing recycled aggregate based on the reuse of construction waste according to claim 5, characterized in that, The second magnetic separation mechanism includes: A magnetic roller (401) is rotatably connected to the inner wall of the box body (101). A first servo motor (402) is installed on the outer wall of the box body (101). The output end of the first servo motor (402) is drivingly connected to one end of the magnetic roller (401). An adjusting mechanism is arranged below the magnetic roller (401); A rotating rod (403) is rotatably connected to the inner wall of the box body (101), and bristles (404) are arranged on the outer wall of the rotating rod (403). A first sprocket (405), the other end of the magnetic roller (401) penetrates through the inner wall of the box body (101) and is fixedly sleeved with a first sprocket (405), one end of the rotating rod (403) penetrates through the inner wall of the box body (101) and is fixedly sleeved with a second sprocket (406), a chain (407) is drivingly connected between the first sprocket (405) and the second sprocket (406), and a first protective frame (408) is fixedly connected to the outer wall of the box body (101). A second rotating roller (501) is symmetrically rotatably connected to the inner wall of the box body (101), a second conveyor belt (502) is drivingly connected between the two second rotating rollers (501), and a second connecting mechanism is arranged between the second rotating roller (501) and the connecting piece (305). A scraper (503) is fixedly connected to the outer wall of the second conveyor belt (502) at intervals. An arc-shaped baffle (504) is fixedly connected to the inner wall of the box body (101). A third material sliding plate (505) is obliquely and fixedly connected to the inner wall of the box body (101).

9. A preparation method of recycled aggregate based on the recycling of construction waste according to claim 8, characterized in that, The adjusting mechanism includes: A connecting frame (601), a chute is provided on the inner wall of the box body (101), the outer wall of the connecting frame (601) is slidably connected to the inner wall of the chute, a rotating cylinder (205) is rotatably connected to the inner wall of the connecting frame (601), and the first fixed cylinder (301) is fixedly inserted through the inner wall of the connecting frame (601). A telescopic cylinder (602) is installed at the bottom end of the box body (101), and the output end of the telescopic cylinder (602) penetrates through the bottom end of the box body (101) and is drivingly connected to the bottom end of the connecting frame (601).

10. A method for preparing recycled aggregate based on the reuse of construction waste according to claim 9, characterized in that The second connecting mechanism includes: A second protective frame (603) is fixedly connected to the outer wall of the box body (101). A first worm gear (604), one end of the second rotating roller (501) penetrates through the inner wall of the box body (101) and is fixedly connected to one side of the first worm gear (604), a first fixed block (606) is fixedly connected to the outer wall of the box body (101), a first worm (607) is rotatably inserted through the bottom end of the first fixed block (606), and the outer wall of the first worm (607) is meshed with the outer wall of the first worm gear (604). The second worm gear (605), one end of the rotary cylinder (205) sequentially penetrates through the connecting frame (601) and the inner wall of the box body (101) and is fixedly connected to one side of the second worm gear (605). A connecting groove (608) is formed in one side of the box body (101). A second fixing block (609) is fixedly connected to the outer wall of the connecting frame (601) at the position of the connecting groove (608). The top end of the second fixing block (609) is rotatably connected to a second worm (610). The outer wall of the second worm gear (605) is meshed with the inner wall of the second worm (610); A connecting cylinder (611), the connecting cylinder (611) is fixedly connected to the bottom end of the first worm (607). A square hole (612) is formed in the bottom end of the connecting cylinder (611). A square rod (613) is fixedly connected to the top end of the second worm (610). The square rod (613) is inserted into the inner wall of the second spherical hole (614). A plurality of second spherical holes (614) are formed in the outer wall of the square rod (613). A second rolling ball (615) is movably clamped in the inner wall of the second spherical hole (614). The outer wall of the second rolling ball (615) is attached to the inner wall of the square hole (612); A second servo motor (616), the second servo motor (616) is installed at the top end of the second protective frame (603). The output end of the second servo motor (616) is drivingly connected to the top end of the first worm (607).

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