Premixed concrete recycled aggregate preparation device

Abstract

The invention belongs to the technical field of concrete recycled aggregates, and particularly relates to a premixed concrete recycled aggregate preparation device which comprises a crushing box, a feeding hopper is arranged at the top end of the crushing box, and a first crushing mechanism, a second crushing mechanism and a screening assembly are sequentially arranged in the crushing box in the material flowing direction. Materials are crushed by the first crushing mechanism and the second crushing mechanism to form crushed materials, and the crushed materials are intercepted on the screening assembly. The lower portion of the crushing box communicates with a grinding box body, a pushing assembly, a grinding cylinder, a grinding mechanism, a linkage assembly and a driving part are arranged in the grinding box body, the grinding mechanism is located in the grinding cylinder, the pushing assembly is used for pushing crushed materials into the grinding cylinder, and the grinding cylinder and the grinding mechanism rotate through the linkage assembly and the driving part; and the rotating directions of the grinding cylinder and the grinding mechanism are opposite. The recycled aggregate with stable quality can be prepared through the processes of multi-stage crushing, sieving, grinding and the like, and the performance indexes of the recycled aggregate can meet the requirements of concrete production.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of concrete recycled aggregate, and particularly relates to a premixed concrete recycled aggregate preparation device. BACKGROUND

[0002] The annual production of construction waste shows a significant growth trend, and the renewable components such as concrete and bricks account for a high proportion. However, the current construction waste treatment mode is still mainly extensive, and most of the waste is not sorted or pretreated, but directly transported to the suburban junction for simple landfill or open-air stacking. This disposal mode not only leads to the invalid occupation of millions of mu of land resources every year, but also causes secondary environmental disasters such as soil degradation and groundwater pollution due to leachate leakage and dust pollution.

[0003] Although the construction waste recycled aggregate technology has achieved industrial application, its performance bottleneck still restricts large-scale promotion: the weak interface transition zone formed by the residual hardened cement paste in the crushing process leads to the water absorption rate of the recycled aggregate being 30%-50% higher than that of the natural aggregate, and the crushing index value exceeding the standard limit value by 2-3 times, which is difficult to meet the requirements of structural engineering on material durability.

[0004] Therefore, it is necessary to design a premixed concrete recycled aggregate preparation device to solve the above problems. SUMMARY

[0005] The purpose of the application is to provide a premixed concrete recycled aggregate preparation device to solve the problems existing in the prior art.

[0006] To achieve the above purpose, the application provides a premixed concrete recycled aggregate preparation device, which comprises a crushing box, the top end of the crushing box is provided with an inlet hopper, the inside of the crushing box is sequentially provided with a first crushing mechanism, a second crushing mechanism and a screening assembly along the material flow direction, the material is crushed by the first crushing mechanism and the second crushing mechanism to form crushed material and is intercepted on the screening assembly; the lower part of the crushing box is communicated with a grinding box body, the grinding box body is provided with a pushing assembly, a grinding cylinder, a grinding mechanism, a linkage assembly and a driving piece, the grinding mechanism is located in the grinding cylinder, the pushing assembly is used for pushing the crushed material into the grinding cylinder, the grinding cylinder and the grinding mechanism rotate through the linkage assembly and the driving piece, and the rotating directions of the grinding cylinder and the grinding mechanism are opposite, and the crushed material is ground through the grinding mechanism and the grinding cylinder.

[0007] Preferably, the grinding box comprises a circular tube and an outer tube, the circular tube is communicated with the crushing box through the outer tube; the grinding cylinder comprises an inner tube coaxially rotating in the outer tube, and the inner tube is communicated with the crushing box, and a drum is coaxially fixedly connected to the side of the inner tube away from the crushing box, and a plurality of grinding convex areas and a plurality of screening areas are alternately arranged on the side wall of the drum in the circumferential direction.

[0008] Preferably, the pushing assembly comprises a rotating shaft coaxially rotating in the inner tube, and the rotating shaft is coaxially fixedly connected to the grinding mechanism at the end away from the crushing box, and a spiral blade is fixedly arranged on the rotating shaft.

[0009] Preferably, the grinding mechanism comprises a first grinding frame coaxially rotating in the grinding cylinder, the cross section of the first grinding frame is a circular structure, a plurality of groups of grinding roller assemblies are equidistantly rotatingly connected to the first grinding frame in the circumferential direction, and a gap is arranged between the grinding roller assemblies and the inner wall of the grinding cylinder.

[0010] Preferably, the grinding assembly comprises a second grinding frame rotatingly connected to the first grinding frame, the cross section of the second grinding frame is a circular structure, a plurality of fixed rods are equidistantly fixedly connected to the second grinding frame in the circumferential direction, and a plurality of grinding balls are equidistantly rotatingly connected to the fixed rods.

[0011] Preferably, the linkage assembly comprises a plurality of roller assemblies rotatingly connected to the inner wall of the circular tube, the plurality of roller assemblies are arranged in the circumferential direction of the drum, the roller assembly comprises a second rotating shaft, a roller is fixedly sleeved on the second rotating shaft, the roller is in frictional contact with the outer wall of the drum, a gear is connected to the end of the second rotating shaft away from the outer tube, the gear is in meshing transmission with an internal tooth ring, the internal tooth ring is coaxially fixedly connected to a first rotating shaft, one end of the first rotating shaft is in transmission cooperation with a driving member, and the other end of the first rotating shaft penetrates through the circular tube, the drum and is coaxially fixedly connected to the grinding mechanism.

[0012] Preferably, the upper part of the grinding box is communicated with a dust collection cover, the dust collection cover is communicated with a bag dust removal device, the bottom end of the grinding box is provided with a second discharge pipe, and a second gate valve is arranged on the second discharge pipe.

[0013] Preferably, the first crushing mechanism comprises two first crushing rollers rotatingly connected to the opposite side walls of the crushing box, the rotating shafts of the two first crushing rollers penetrate through the side walls of the crushing box and are both connected with first gears, and the two first gears are in meshing transmission, and the rotating shaft of one of the first crushing rollers is connected with the output shaft of a first driving motor.

[0014] Preferably, the second crushing mechanism comprises two second crushing rollers rotatably connected to opposite side walls of the crushing box, the rotation shafts of the two second crushing rollers penetrate the side walls of the crushing box and are both connected with second gears, the two second gears are engaged with each other, and the rotation shaft of one of the second crushing rollers is connected with the output shaft of the second driving motor.

[0015] Preferably, the screening assembly comprises a screen hinged to an inner wall of one side of the crushing box, the other end of the screen is elastically connected to the inner wall of the crushing box through an arc-shaped elastic sheet, and the screen is arranged obliquely.

[0016] Compared with the prior art, the present application has the following advantages and technical effects:

[0017] The prepared device for pre-mixed concrete recycled aggregate can preliminarily crush large pieces of pre-mixed concrete into smaller blocky materials through the first crushing mechanism, and further crush the preliminarily crushed materials to form finer crushed materials through the second crushing mechanism. The multi-stage crushing mode can more fully destroy the combination between various components in the concrete, improve the crushing efficiency, ensure that the size of the crushed materials is more uniform, and meet the requirements of subsequent grinding and recycled aggregate preparation.

[0018] The screening assembly arranged after the second crushing mechanism can screen the crushed materials, and screen out fine particles, and the intercepted crushed materials are sent to the grinding box for grinding.

[0019] Through the opposite rotating movement of the grinding cylinder and the grinding mechanism, the crushed materials are subjected to stronger shearing, extrusion and friction in the grinding cylinder, the cement layer on the crushed materials can be more effectively removed, the crushed materials can be ground into the required aggregate, the grinding efficiency is improved, the particle size of the recycled aggregate is finer and more uniform, and the surface is smoother, so that the quality of the recycled aggregate is improved.

[0020] The present application can prepare recycled aggregate with uniform particle size and stable quality through multi-stage crushing, screening and grinding processes, the performance index of the recycled aggregate can meet the requirements of concrete production, and the present application provides reliable guarantee for the wide application of recycled aggregate in building engineering, is conducive to the protection of natural resources and ecological environment, and meets the requirements of sustainable development. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor under the premise of the drawings:

[0022] Fig. 1 Fig. 1 is a schematic diagram of the overall structure of the present application;

[0023] Fig. 2 Fig. 2 is a schematic diagram of the structure of the grinding barrel and grinding mechanism in the present application;

[0024] Fig. 3 Fig. 3 is a schematic diagram of the structure of the grinding mechanism in the present application;

[0025] Wherein: 1, motor; 2, drive pulley; 3, belt; 4, driven pulley; 5, first rotating shaft; 6, inner tooth ring; 7, first grinding frame; 8, second grinding frame; 9, gear; 10, second rotating shaft; 11, roller; 12, support; 13, dust cover; 14, grinding ball; 15, fixed rod; 16, rotating rod; 17, outer tube; 18, inner tube; 19, spiral blade; 20, second crushing roller; 21, handle; 22, guide block; 23, electromagnet; 24, crushing box; 25, first crushing roller; 26, feed hopper; 27, screen; 28, first discharge pipe; 29, first gate valve; 30, arc-shaped elastic sheet; 31, second discharge pipe; 32, second gate valve; 33, screen hole; 34, semispherical protrusion; 35, circular tube; 36, roller. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0028] The technical terms in the embodiments are explained as follows:

[0029] The bag dust removal equipment realizes gas-solid separation through the porous structure of the filter bag (made of synthetic fiber, natural fiber or glass fiber), and the working process is divided into three core stages:

[0030] Filtering stage:

[0031] Screening effect: the porous structure formed by the fiber weaving of the filter bag directly blocks the dust particles with a particle size greater than the pore size (such as particles with a particle size > 1 μm).

[0032] Inertial collision: when the dust-containing gas flows through the filter bag, the direction of the airflow changes, and the dust with larger mass cannot follow the airflow to turn, collides with the surface of the filter bag and is trapped.

[0033] Diffusion: Dust with extremely small particle size (<1 μm) diffuses randomly due to gas molecular Brownian motion, eventually coming into contact with filter bag fibers and being adsorbed.

[0034] Dust primary layer formation: As filtration continues, a "dust primary layer" forms on the surface of the filter bag, with a porous structure that further intercepts fine dust, increasing filtration efficiency to over 99.5%.

[0035] Dust cleaning stage:

[0036] Mechanical vibration dust cleaning: Use a motor to drive an eccentric wheel or cam to vibrate the filter bag, shaking off the surface dust layer (suitable for high concentration and large air volume scenarios).

[0037] Reverse air blowing dust cleaning: Blow off the dust on the outside of the filter bag through reverse airflow (requires separate chamber operation, suitable for scenarios with multiple filter bags and stable air volume).

[0038] Pulse reverse blowing dust cleaning: Inject high-pressure gas into the filter bag through a pulse valve to form a transient reverse blowing airflow, causing the filter bag to vibrate and remove dust (high efficiency, most widely used).

[0039] Dust unloading stage:

[0040] Ash hopper (conical or funnel-shaped) collects dust falling during the dust cleaning process and is periodically discharged through a star-shaped discharge valve or screw conveyor to prevent accumulation and blockage.

[0041] High-efficiency filtration: Dust removal efficiency reaches over 99.5%, capturing fine dust of 0.1-10 μm, with an emission concentration of ≤10 mg / m 3 , meeting strict environmental protection standards.

[0042] Filter bag materials are diverse (such as polyester, fluorine, PTFE), suitable for different working conditions:

[0043] Polyester filter bag: normal temperature (≤130℃), non-corrosive dust.

[0044] Fluorine filter bag: high temperature (≤200℃) environment.

[0045] PTFE filter bag: strong corrosive dust.

[0046] Strong flexibility: wide range of air volume processing (hundreds of m 3 / h to hundreds of thousands of m 3 / h), suitable for small workshops to large factories.

[0047] Can be adapted to different dust properties (such as particle size, humidity, corrosiveness) by replacing filter bag materials.

[0048] Stable operation and low maintenance cost

[0049] Filter bag life: 1-3 years (adjustable according to dust properties and cleaning method). Simple replacement operation.

[0050] Low failure rate of cleaning system (such as pulse valve, ash valve). Daily maintenance only needs to check the integrity of filter bag and clean the ash hopper.

[0051] Equipped with pressure monitoring and temperature protection system, real-time monitoring of filter bag status, to avoid high temperature and high humidity leading to damage.

[0052] Resource recycling and environmental benefits: dry dust removal does not require water, avoiding sewage treatment or slurry treatment costs.

[0053] Recycled dust can be reused (such as cement dust for producing concrete, metal dust for energy recovery), realizing resource recycling.

[0054] Industrial dust control:

[0055] Power plant: purify fly ash generated by coal-fired boiler, reduce emission concentration to 5mg / m 3 Below.

[0056] Cement plant: treat raw meal dust and clinker dust, high concentration dust (50-100g / m 3 ) can be treated to meet emission standards.

[0057] Steel plant: purify blast furnace gas, recover combustible components and remove dust.

[0058] Mechanical processing and casting industry

[0059] Collect welding fume and grinding dust, improve workshop environment and prevent metal dust from wearing equipment.

[0060] Recycle sand dust and metal dust (such as cast iron dust and aluminum alloy dust), reduce raw material consumption.

[0061] Other fields

[0062] Grain processing: remove flour dust to prevent explosion risk.

[0063] Chemical industry: treat plastic dust and resin dust to avoid harmful gas emission.

[0064] Waste incineration: capture incineration fly ash to reduce secondary pollution.

[0065] Low resistance design: optimize filter bag structure and cleaning method to reduce equipment operation energy consumption.

[0066] Long filter bag life: develop new filter material with high temperature resistance and corrosion resistance to prolong filter bag service life.

[0067] Intelligent control: combined with Internet of Things technology, real-time monitoring of filter bag state and automatic adjustment of dust removal frequency to improve operation efficiency.

[0068] Referring Figs. 1 to 3 As shown in the figure, the present application provides a kind of pre-mixed concrete recycled aggregate preparation device, including broken box 24, the top of broken box 24 is provided with inlet hopper 26, first crushing mechanism, second crushing mechanism and screening assembly are sequentially provided in the inside of broken box 24 along material flow direction, material is crushed by first crushing mechanism and second crushing mechanism and is intercepted on screening assembly to form broken material;The lower part of broken box 24 is communicated with grinding box body, grinding box body is provided with pusher assembly, grinding cylinder, grinding mechanism, linkage assembly and driving part, grinding mechanism is located in grinding cylinder, pusher assembly is used to push broken material into grinding cylinder, grinding cylinder, grinding mechanism are rotated by linkage assembly, driving part, and the turning direction of grinding cylinder and grinding mechanism is opposite, and broken material is completed grinding by grinding mechanism, grinding cylinder.

[0069] In this embodiment, first discharge pipe 28 is provided at the bottom end of broken box 24, first gate valve 29 is provided on first discharge pipe 28, which facilitates the discharge of particles screened out of broken box 24.

[0070] Through first crushing mechanism, large pieces of pre-mixed concrete can be preliminarily crushed, and they are broken down into smaller sized block materials;Second crushing mechanism further refines the broken material after preliminary crushing, so that the material forms finer broken material. This multi-stage crushing method can more fully destroy the combination between the components in the concrete, improve the crushing efficiency, ensure that the size of the broken material after crushing is more uniform, and meet the requirements of subsequent grinding and recycled aggregate preparation.

[0071] By setting screening assembly after second crushing mechanism, the crushed broken material can be screened, and the fine particles are screened out, and the intercepted broken material is sent to grinding box for grinding.

[0072] Through the opposite rotating motion of grinding cylinder and grinding mechanism, the broken material in the grinding cylinder is subjected to stronger shearing, extrusion and friction, which can more effectively remove the cement layer on the broken material, grind it into the required aggregate, improve the grinding efficiency, make the particle size of recycled aggregate finer and more uniform, and the surface smoother, thereby improving the quality of recycled aggregate.

[0073] Further, the grinding box body includes a circular pipe 35 and an outer pipe 17, and the circular pipe 35 is communicated with the broken box 24 through the outer pipe 17;The grinding cylinder includes an inner pipe 18 coaxially rotating in the outer pipe 17, and the inner pipe 18 is communicated with the broken box 24, and the side of the inner pipe 18 away from the broken box 24 is coaxially fixedly connected with a drum 36, and a plurality of grinding convex regions and a plurality of screening regions are alternately arranged on the side wall of the drum 36.

[0074] In the embodiment, the grinding protrusion area includes a plurality of hemispherical protrusions 34 fixedly connected at equal intervals on the inner wall of the roller 36, and the plurality of hemispherical protrusions 34 are arranged in a rectangular array; the sieving area includes a plurality of sieve holes 33 opened at equal intervals on the inner wall of the roller 36, and the plurality of sieve holes 33 are arranged in a rectangular array.

[0075] The plurality of hemispherical protrusions 34 arranged in a rectangular array on the inner wall of the roller 36 increase the contact area and friction between the inner wall of the roller 36 and the crushed materials, and the hemispherical protrusions 34 can perform more intense shearing and grinding on the crushed materials during the rotation of the roller 36, thereby greatly improving the grinding efficiency and shortening the grinding time.

[0076] The plurality of sieve holes 33 opened on the inner wall of the roller 36 and arranged in a rectangular array can timely discharge the aggregates with a particle size meeting the requirements through the sieve holes 33, and retain the crushed materials with a large particle size in the roller 36 for further grinding during the grinding process. This timely sieving and material circulation mode avoids over-grinding and under-grinding, and ensures that all the crushed materials can be fully ground, thereby further improving the overall grinding efficiency.

[0077] Further, the pushing assembly includes a rotating rod 16 coaxially and rotatably connected in the inner tube 18, and the rotating rod 16 is coaxially and fixedly connected with the grinding mechanism at an end away from the crushing box 24, and a spiral blade 19 is fixedly arranged around the rotating rod 16.

[0078] During the grinding process, the rotating grinding mechanism drives the rotating rod 16 and the spiral blade 19 to rotate, and the crushed materials intercepted on the sieving assembly are pushed into the grinding cylinder by the spiral blade 19 for grinding by the grinding mechanism, so that the crushed materials can stably enter the grinding cylinder for grinding, and the blockage or flow interruption of the materials during the conveying process is avoided.

[0079] Further, the grinding mechanism includes a first grinding frame 7 coaxially and rotatably connected in the grinding cylinder, the cross section of the first grinding frame 7 is a circular structure, a plurality of groups of grinding roller assemblies are rotatably connected at equal intervals in the circumferential direction of the first grinding frame 7, and a gap is arranged between the grinding roller assemblies and the inner wall of the grinding cylinder.

[0080] The first grinding frame 7 rotatably connects a plurality of groups of grinding roller assemblies at equal intervals in the circumferential direction, and this arrangement makes the grinding roller assemblies uniformly distributed in the grinding cylinder. During the grinding process, the crushed materials can be subjected to the force of the grinding roller assemblies regardless of the position of the crushed materials in the grinding cylinder, thereby avoiding the conditions of local over-grinding or under-grinding, and ensuring the uniformity of the particle size of the recycled aggregates.

[0081] The plurality of grinding roller assemblies participate in grinding work at the same time, can extrude, shear and rub the crushed material from different directions, so that the crushed material is subjected to comprehensive grinding in three-dimensional space. The multi-dimensional and all-around grinding mode further improves the uniformity of grinding and ensures the stable quality of the recycled aggregate.

[0082] Further, the grinding assembly comprises a second grinding frame 8 rotatably connected to the first grinding frame 7. The second grinding frame 8 has a circular cross-section, and a plurality of fixed rods 15 are fixedly connected to the second grinding frame 8 at equal intervals in the circumferential direction. A plurality of grinding balls 14 are rotatably connected to the fixed rods 15 at equal intervals.

[0083] In this embodiment, a gap is provided between the grinding balls 14 and the hemispherical protrusions 34 provided on the inner wall of the drum 36.

[0084] The second grinding frame 8 drives the fixed rods 15 and the grinding balls 14 to rotate, forming a multi-stage grinding system with the hemispherical protrusions 34 on the inner wall of the drum 36.

[0085] The plurality of fixed rods 15 are distributed at equal intervals on the second grinding frame 8, and a plurality of grinding balls 14 are rotatably connected to each fixed rod 15, greatly increasing the contact area between the grinding balls 14 and the crushed material. In the same time, more crushed material can participate in grinding, speeding up the crushing and refining speed, shortening the grinding period and improving the overall production efficiency.

[0086] In addition, during the grinding process, the repeated extrusion, friction and shearing of the grinding balls 14 and the hemispherical protrusions 34 on the crushed material can effectively remove the cement paste layer on the recycled aggregate.

[0087] Further, the linkage assembly comprises a plurality of roller assemblies rotatably connected to the inner wall of the circular pipe 35. The plurality of roller assemblies are arranged along the circumferential direction of the drum 36. The roller assembly comprises a second shaft 10, a roller 11 fixedly sleeved on the second shaft 10, the roller 11 being in frictional contact with the outer wall of the drum 36. The end of the second shaft 10 away from the outer pipe 17 is connected with a gear 9, the gear 9 being in meshing transmission with an internal tooth ring 6, the internal tooth ring 6 being coaxially fixedly connected with a first shaft 5, one end of the first shaft 5 being in transmission cooperation with a driving member, and the other end of the first shaft 5 penetrating the circular pipe 35 and the drum 36 and being coaxially fixedly connected with the grinding mechanism.

[0088] In this embodiment, a support 12 is fixedly connected to the circular pipe 35, and the second shaft 10 is rotatably connected to the support 12. The driving member is a motor 1, a driving pulley 2 is connected to the output end of the motor 1, and a driven pulley 4 is connected to the first shaft 5. The driven pulley 4 is in transmission cooperation with the driving pulley 2 through a belt 3.

[0089] The motor 1 drives the first rotating shaft 5 through the belt 3, and the first rotating shaft 5 drives the inner tooth ring 6 to rotate, and the inner tooth ring 6 is driven by the gear 9 to rotate, and then the second rotating shaft 10 and the roller 11 are driven to rotate, and the roller 11 drives the drum 36 to rotate reversely with the first rotating shaft 5, and the first rotating shaft 5 drives the grinding mechanism to rotate reversely with the drum 36.

[0090] Further, the upper part of the grinding box is communicated with the dust cover 13, the dust cover 13 is communicated with the bag dust removal equipment, and the bottom end of the grinding box is provided with the second discharge pipe 31, and the second discharge pipe 31 is provided with the second gate valve 32.

[0091] A large amount of fine dust particles are generated in the process of crushing the materials, and the fine dust particles enter the grinding box through the screen hole 33 and the dust cover 13 and the bag dust removal equipment, and the dust is removed, so that the dust overflow is reduced and the working environment is effectively improved.

[0092] The crushed aggregate is discharged through the second discharge pipe 31.

[0093] Further, the first crushing mechanism includes two first crushing rollers 25 rotatably connected to the opposite side walls of the crushing box 24, the rotating shafts of the two first crushing rollers 25 penetrate the side walls of the crushing box 24 and are both connected with first gears, and the two first gears are engaged with each other, wherein the rotating shaft of one of the first crushing rollers 25 is connected with the output shaft of the first driving motor.

[0094] The first driving motor drives one of the first crushing rollers 25 to rotate, and the two first crushing rollers 25 rotate towards each other through the engagement transmission of the two first gears, so that the materials are preliminarily crushed.

[0095] Further, the second crushing mechanism includes two second crushing rollers 20 rotatably connected to the opposite side walls of the crushing box 24, the rotating shafts of the two second crushing rollers 20 penetrate the side walls of the crushing box 24 and are both connected with second gears, and the two second gears are engaged with each other, wherein the rotating shaft of one of the second crushing rollers 20 is connected with the output shaft of the second driving motor.

[0096] The second driving motor drives one of the second crushing rollers 20 to rotate, and the two second crushing rollers 20 rotate towards each other through the engagement transmission of the two second gears, so that the materials are secondarily crushed.

[0097] Further, the screening assembly includes a screen 27 hinged to one side inner wall of the crushing box 24, and the other end of the screen 27 is elastically connected to the inner wall of the crushing box 24 through the arc-shaped elastic sheet 30, and the screen 27 is inclinedly arranged.

[0098] The screen 27 is hinged at one end and is elastically connected to the inner wall of the crushing box through the arc spring 30. The crushed materials fall on the screen 27 and are bounced up under the elastic action of the arc spring 30, and at the same time, the screen 27 is vibrated periodically under the action of the arc spring 30. The vibration can further promote the movement of the crushed materials on the screen 27, prevent the crushed materials from blocking the screen holes, and improve the screening efficiency.

[0099] Further, two guide blocks 22 are slidably arranged on the opposite side walls of the crushing box 24, and an electromagnet 23 is arranged on the inclined surface of each guide block 22. The side of the guide block 22 away from the electromagnet 23 is connected to the handle 21. The two electromagnets 23 are arranged between the first crushing mechanism and the second crushing mechanism.

[0100] Through the guide block 22, on the one hand, the materials crushed by the first crushing mechanism are guided to smoothly enter the second crushing mechanism, and on the other hand, the electromagnet 23 on the guide block 22 magnetically attracts the reinforcing bars or iron blocks in the materials to separate them from the materials, thereby avoiding affecting the normal operation of the pushing assembly and the grinding mechanism.

[0101] The prepared device for the recycled aggregate of the ready-mixed concrete has the following working principle: when in use, the materials are put into the feeding hopper 26, and then pass through the first crushing mechanism and the second crushing mechanism in sequence, so that the materials are fully crushed and form crushed materials which are intercepted on the screen 27. The fine particles pass through the screen 27 and are collected in the first discharge pipe 28. Then, the motor 1 and the bag dust removal equipment are started. The motor 1 drives the first rotating shaft 5 to rotate through the belt 3, the first rotating shaft 5 drives the inner gear ring 6 to rotate, the inner gear ring 6 is driven to rotate through the gear 9, the second rotating shaft 10 and the roller 11 are driven to rotate, the roller 11 drives the drum 36 and the first rotating shaft 5 to rotate in opposite directions, the first rotating shaft 5 drives the grinding mechanism to rotate in the opposite direction, the drum 36 and the grinding mechanism rotate in opposite directions, the grinding mechanism drives the pushing assembly to operate, the crushed stones on the screen 27 are orderly pushed into the grinding cylinder for grinding, the aggregate with a particle size meeting the requirements and the fine particles are discharged in time through the screen hole 33, the fine particles are treated by the bag dust removal equipment through the dust collection cover 13, and the aggregate with a particle size meeting the requirements is discharged through the second discharge pipe 31 and collected.

[0102] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0103] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A device for preparing recycled aggregate for ready-mixed concrete, characterized in that, The device includes a crushing box (24), with a feed hopper (26) at the top. Inside the crushing box (24), a first crushing mechanism, a second crushing mechanism, and a screening assembly are arranged sequentially along the material flow direction. The material is crushed by the first crushing mechanism and the second crushing mechanism to form small pieces, which are then intercepted on the screening assembly. The lower part of the crushing box (24) is connected to a grinding box. Inside the grinding box, a pushing assembly, a grinding cylinder, a grinding mechanism, a linkage assembly, and a driving component are arranged. The grinding mechanism is located inside the grinding cylinder. The pushing assembly is used to push the small pieces into the grinding cylinder. The grinding cylinder and the grinding mechanism rotate through the linkage assembly and the driving component, and the grinding cylinder and the grinding mechanism rotate in opposite directions. The small pieces are ground by the grinding mechanism and the grinding cylinder.

2. The ready-mixed concrete recycled aggregate preparation device according to claim 1, characterized in that, The grinding chamber includes a round tube (35) and an outer tube (17). The round tube (35) is connected to the crushing chamber (24) through the outer tube (17). The grinding cylinder includes an inner tube (18) that rotates coaxially within the outer tube (17) and is connected to the crushing chamber (24). A roller (36) is coaxially fixedly connected to the side of the inner tube (18) away from the crushing chamber (24). Multiple grinding protrusions and multiple screening areas are alternately arranged along the circumference on the side wall of the roller (36).

3. The ready-mixed concrete recycled aggregate preparation device according to claim 2, characterized in that, The pushing component includes a rotating rod (16) coaxially rotatably connected inside the inner tube (18). One end of the rotating rod (16) away from the crushing box (24) is coaxially fixedly connected to the grinding mechanism. A spiral blade (19) is fixedly wound on the rotating rod (16).

4. The ready-mixed concrete recycled aggregate preparation device according to claim 1, characterized in that, The grinding mechanism includes a first grinding frame (7) coaxially rotatably connected inside the grinding cylinder. The first grinding frame (7) has a circular cross-section. The first grinding frame (7) is rotatably connected to multiple sets of grinding roller assemblies at equal intervals along the circumference. A gap is provided between the grinding roller assemblies and the inner wall of the grinding cylinder.

5. The ready-mixed concrete recycled aggregate preparation device according to claim 4, characterized in that, The grinding assembly includes a second grinding frame (8) rotatably connected to the first grinding frame (7). The second grinding frame (8) has a circular cross-section. Multiple fixing rods (15) are fixedly connected to the second grinding frame (8) at equal intervals in the circumference. Multiple grinding balls (14) are rotatably connected to the fixing rods (15) at equal intervals.

6. The ready-mixed concrete recycled aggregate preparation device according to claim 2, characterized in that, The linkage assembly includes multiple roller assemblies rotatably connected to the inner wall of the circular tube (35). The multiple roller assemblies are arranged circumferentially along the roller (36). Each roller assembly includes a second rotating shaft (10). A roller (11) is fixedly sleeved on the second rotating shaft (10). The roller (11) is in frictional contact with the outer wall of the roller (36). A gear (9) is connected to one end of the second rotating shaft (10) away from the outer tube (17). The gear (9) meshes with an internal gear ring (6). The internal gear ring (6) is coaxially fixedly connected to a first rotating shaft (5). One end of the first rotating shaft (5) is in transmission cooperation with a driving component. The other end of the first rotating shaft (5) passes through the circular tube (35) and the roller (36) and is coaxially fixedly connected to the grinding mechanism.

7. The ready-mixed concrete recycled aggregate preparation device according to claim 1, characterized in that, The upper part of the grinding box is connected to a dust collection hood (13), and the dust collection hood (13) is connected to a bag filter. The bottom end of the grinding box is provided with a second discharge pipe (31), and a second gate valve (32) is provided on the second discharge pipe (31).

8. The ready-mixed concrete recycled aggregate preparation device according to claim 1, characterized in that, The first crushing mechanism includes two first crushing rollers (25) rotatably connected to opposite side walls of the crushing box (24). The shafts of the two first crushing rollers (25) pass through the side walls of the crushing box (24) and are each connected to a first gear. The two first gears mesh with each other. The output shaft of a first drive motor is connected to the shaft of one of the first crushing rollers (25).

9. The ready-mixed concrete recycled aggregate preparation device according to claim 1, characterized in that, The second crushing mechanism includes two second crushing rollers (20) rotatably connected to the opposite side walls of the crushing box (24). The shafts of the two second crushing rollers (20) pass through the side walls of the crushing box (24) and are each connected to a second gear. The two second gears mesh with each other. The output shaft of a second drive motor is connected to the shaft of one of the second crushing rollers (20).

10. The ready-mixed concrete recycled aggregate preparation device according to claim 1, characterized in that, The screening assembly includes a screen (27) hinged to the inner wall of one side of the crushing box (24). The other end of the screen (27) is elastically connected to the inner wall of the crushing box (24) through an arc-shaped spring piece (30). The screen (27) is set at an angle.

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