CN111825361B - Regenerated aggregate particle surface strengthening equipment and operation method thereof - Google Patents
Regenerated aggregate particle surface strengthening equipment and operation method thereof Download PDFInfo
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- CN111825361B CN111825361B CN202010769357.1A CN202010769357A CN111825361B CN 111825361 B CN111825361 B CN 111825361B CN 202010769357 A CN202010769357 A CN 202010769357A CN 111825361 B CN111825361 B CN 111825361B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
- B07B1/4663—Multi-layer screening surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B2201/00—Details applicable to machines for screening using sieves or gratings
- B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention discloses a surface strengthening device for regenerated aggregate particles and an operation method thereof, wherein the device comprises an outer bin, the left side of the upper part of the outer bin is provided with a ventilation opening, and the right side of the upper part of the outer bin is provided with a dust suction opening; the rotary bin is rotatably arranged on the upper part of the inner cavity of the outer bin under the driving of a second external motor; the rotary spraying device is rotatably arranged in the rotary bin and is driven by the motor to rotate in the opposite direction of the rotary bin; the strengthening liquid container is communicated with the rotary spraying device through a pipeline; the multi-layer vibrating screen is driven by a first external motor, is arranged at the lower part of the inner cavity of the outer bin and is positioned below the rotating bin; the filter screen is arranged at the bottom of the inner cavity of the outer bin and is positioned below the multiple layers of vibrating screens. The invention contains the functions of cleaning, surface strengthening and screening the adhesion mortar of the regenerated aggregate particles, realizes the stripping of the adhesion mortar with weak surface and the filling of micropores and cracks, and solves the problems of single function and large consumption of strengthening liquid of the regenerated aggregate particle strengthening equipment.
Description
Technical Field
The invention relates to the technical field of cement and concrete treatment, in particular to regenerated aggregate particle surface strengthening equipment and an operation method thereof.
Background
With the continuous improvement of the urbanization process of China and the rapid development of the construction of traffic infrastructures, a large amount of waste materials are generated by updating the construction engineering structure. At present, annual average construction waste in China reaches 6 hundred million tons, wherein the waste cement concrete accounts for more than 60 percent, so that the solid waste recycling of the construction waste not only avoids the environmental pollution caused by burying and stacking, but also relieves the contradiction between supply and demand of engineering structures such as roads and the like on natural mineral materials. In addition, state offices, science and technology departments, development and improvement committees and the like issue serial policies to promote the implementation of 'green economy' research, wherein the 'scheme for construction of the strong traffic states' indicates that 'the updating and utilization of old facilities are enhanced, construction materials and waste materials are popularized and recycled, and the resource recycling and recycling levels are improved'. Therefore, for the field of road engineering, how to effectively solve the difficulty in recycling solid waste materials and improve the material performance and structural performance optimization technology is not only required by engineering application, but also conforms to the national policy guide.
The application of the waste cement concrete in the road structure is mainly to prepare the asphalt concrete by using the crushed and screened regenerated particles to completely or partially replace natural aggregates. Typical waste cement concrete regenerated particles are complex in components and have more porous weak parts, and cement mortar wrapped with waste aggregates has adverse effects on water absorption rate and strength. The consumption of the regenerated particles in the asphalt concrete can reach 20-90% of the total mass, but due to the influences of the porous adhesion mortar, the low strength, the weak bonding property and the like, the regenerated particle asphalt concrete is easy to have the phenomena of secondary particle crushing, asphalt mortar interface peeling and the like in the forming and service processes, so that the structural strength is degraded and the long-term service performance is attenuated. The core of strengthening the regenerated aggregate particles is to reduce water absorption and reduce a porous structure, and the strengthening mode can be divided into two types of adhering mortar removal and surface strengthening. At the present stage, the adhered mortar is separated mainly through a mechanical or chemical technology, and the cement mortar is peeled off by adopting the rotary vibration of an electric eccentric wheel and a grinding means of a steel ball. The main idea of mortar reinforcement is to adopt special materials to fill the gap structure of the attached mortar and reinforce the old aggregate-attached mortar adhesive interface structure. In the aspect of selecting the reinforcing material, the slag cement slurry can repair the internal secondary microcracks of the regenerated particles, the wrapping thickness of the slag cement slurry of 0.25mm effectively improves the abrasion value of the regenerated particle asphalt concrete los angeles, and simultaneously, the requirements of high-temperature performance and low-temperature performance are considered. The silicone resin solution can quickly fill the regenerated particle gaps and microcrack structures and form strength, reduce the water absorption rate and the secondary crushing probability and enhance the water stability of the regenerated particle asphalt concrete.
Chinese invention patent with patent number ZL201811331818.6 discloses a device and a method for generating C-S-H reinforced regenerated aggregate in situ, the device comprises a first bin, a second bin, a third bin and a blast drying device, and the first bin, the second bin and the third bin are all sealed chambers; the top of the third chamber is provided with a spraying structure, the first chamber and the second chamber are both connected with the spraying structure through a pump, the lower end of the spraying structure is provided with a loading box body, the periphery of the wall of the loading box body is hollowed out, a certain gap is left between the bottom of the loading box body and the bottom of the third chamber, and the bottom of the third chamber is provided with at least one liquid discharge port; the blowing drying device is connected with the lower end of the third chamber, and a cover body is arranged at the upper end of the third chamber. The first bin is used for containing calcium hydroxide solution, the second bin is used for containing TEOS, water and absolute ethyl alcohol solution, and the third bin is provided with a loading box body which is used for containing aggregate to be regenerated.
Above-mentioned prior art only plays the soaking strengthening effect of regeneration aggregate granule, can't carry out weak laitance in surface and secondary screening to regeneration aggregate granule, if rely on other equipment will waste time and energy, increase and strengthen economy and time cost. Furthermore, the aggregate soaking mode is adopted for reinforcement, so that the consumption of the reinforcement material is large; meanwhile, the regenerated aggregate particles are piled together and are difficult to dry, which has adverse effect on the application of the regenerated aggregate particles.
Chinese patent No. ZL201811332138.6 discloses a device and a method for strengthening regenerated aggregate based on in-situ generation of calcium carbonate, and the device comprises a first bin, a second bin, a third bin, a rotating device and a blast drying device, wherein the first bin, the second bin and the third bin are all sealed chambers; a loading box body is arranged in the third chamber, the periphery of the wall of the loading box body is hollowed out, the hollow aperture is smaller than the particle size of the regenerated aggregate, two ends of the loading box body are rotatably fixed on opposite side walls of the third chamber, a certain gap is reserved between the bottom of the loading box body and the bottom of the third chamber, and at least one liquid discharge port is arranged at the bottom of the third chamber; the rotating device comprises at least one motor, the motor is arranged on the side surface of the third chamber and is connected with the loading box body through a connecting shaft, and the motor acts to drive the loading box body to rotate; and the blowing drying device is connected with the lower end of the third chamber.
The second prior art is similar to the first prior art, and the greatest difference is that the loading box body is changed into a rotatable structure, the main purpose of the second prior art is to improve the effective surface of the contact strengthening liquid on the particle surface when the regenerated aggregate particles are soaked, but the problems in the first prior art are not solved.
Disclosure of Invention
The invention aims to provide regenerated aggregate particle surface strengthening equipment and an operation method thereof, which comprise the functions of removing adhesion mortar of regenerated aggregate particles, strengthening the surface and screening, realize the stripping of adhesion mortar with weak surface and the filling of micropores and cracks, solve the problems of single function and large consumption of strengthening liquid of the regenerated aggregate particle strengthening equipment, and provide effective equipment and a method for strengthening the regenerated aggregate particles.
In order to achieve the above purpose, the invention provides the following technical scheme:
a reclaimed aggregate particle surface strengthening apparatus comprising:
the left side of the upper part of the outer bin is provided with a ventilation opening, and the right side of the upper part of the outer bin is provided with a dust collection opening; an outer bin side cover is arranged at the left opening of the lower part of the; an outer bin top cover is arranged at the opening at the top; the bottom is provided with a reinforced liquid recovery port;
the rotary bin is of a cylindrical structure consisting of a framework and a rotary bin screen covered outside the framework; the rotary bin is rotatably arranged at the upper part of the inner cavity of the outer bin under the driving of a second outer motor; one end surface of the rotary bin is opposite to the ventilation opening, and the other end surface of the rotary bin is opposite to the dust collection opening;
the rotary spraying device is rotatably arranged in the rotary bin and driven by the motor to rotate in the opposite direction of the rotary bin;
the strengthening liquid container is communicated with the rotary spraying device through a pipeline;
the multi-layer vibrating screen is driven by a first external motor, is arranged at the lower part of the inner cavity of the outer bin and is positioned below the rotating bin;
and the filter screen is arranged at the bottom of the inner cavity of the outer bin and is positioned below the multiple layers of vibrating screens.
Further, the outer bin is a cubic box body made of metal materials.
Furthermore, the framework of the rotary bin is an octagonal columnar steel frame, and the eight side faces of the rotary bin can be replaced with rotary bin screens with the aperture between 1.18mm and 26mm according to the screening requirement of the regenerated aggregate particles.
Furthermore, the rotary spraying device comprises four pipelines, a plurality of spray heads are uniformly arranged on each pipeline along the axial direction, the four pipelines are arranged in parallel along the axial direction of the rotary bin, the four pipelines are close to the inner surface of the rotary bin and are distributed in a cross shape around the axis of the rotary bin, the end parts of the four pipelines on the same side are connected through a cross-shaped pipeline, the center of the cross-shaped pipeline is in transmission connection with a motor, and the cross-shaped pipeline drives the four pipelines, the spray heads on the four pipelines and the rotary bin to rotate reversely under the driving of the motor; the four pipelines are communicated with the strengthening liquid container through pipelines.
Furthermore, the multilayer vibrating screen and the filter screen are respectively arranged on a guide rail in the outer bin.
Further, the multi-layer vibratory screen comprises a dry set of screens of different pore sizes.
Further, the aperture of the screen in the multilayer vibrating screen is between 4.75mm and 16 mm.
Furthermore, the aperture of the filter screen is 0.075 mm.
Furthermore, four ventilation openings are uniformly formed in the left side of the upper portion of the outer bin, four dust suction ports are uniformly formed in the right side of the upper portion of the outer bin, and the dust suction ports correspond to the ventilation openings one to one.
The surface strengthening equipment for the regenerated aggregate particles, which is described in any one of the above, and the operation method thereof is as follows:
1) the method comprises the following steps of (1) initially crushing waste cement concrete, pouring the crushed waste cement concrete into a rotary bin, pre-installing a plurality of groups of rotary bin screens with certain apertures in the rotary bin according to actual requirements, and installing the last group of rotary bin screens after pouring regenerated aggregate particles;
2) starting a second external motor to drive the rotary bin to rotate at a certain angular speed, and simultaneously starting the ventilation opening and the dust collection opening to quickly remove fine powder and fine particles generated by mutual impact of regenerated aggregate particles;
3) the angular speed of the rotating bin is controlled to be between 20 r/min and 60 r/min, and the rotating time is controlled to be between 1 minute and 10 minutes;
4) starting a motor connected with the rotary spraying device, driving the rotary spraying device to rotate and spray the strengthening liquid at the same angular speed in the direction opposite to the rotary bin by the motor, wherein the duration time is not less than 5 minutes;
5) closing the rotary spraying device and stopping rotating the rotary spraying device, continuously operating the rotary bin for 5-10 minutes to ensure that the surface of the regenerated aggregate particles is air-dried, re-starting the rotary spraying device and rotating the rotary spraying device, spraying diluted resin solution heated to 90 degrees, and continuing for 1 minute; the rotary bin, the ventilation opening and the dust collection opening continue to work for 10 minutes, and the operation is stopped after the diluted resin forms certain curing strength, so that reinforced regenerated aggregate particles are obtained;
6) respectively placing a plurality of layers of vibrating screens with different apertures according to the screening requirement;
7) opening any group of rotary bin screens to enable the reinforced regenerated aggregate particles to fall into the uppermost layer of the multiple layers of vibrating screens; starting a first external motor, driving the multilayer vibrating screen by the first external motor, and controlling the vibration time to be 5-10 minutes, wherein the regenerated aggregate particles pass through the multilayer vibrating screen according to the particle size;
8) and after the vibration is finished, respectively taking out the vibration screens with different sizes to obtain regenerated aggregate particles distributed according to the standard particle size.
The surface strengthening equipment for the regenerated aggregate particles and the operation method thereof provided by the invention have the following beneficial effects:
1) the rotary bin can replace the screen of the rotary bin according to actual needs, so that the functions of effectively removing weak floating slurry on the surface of the regenerated aggregate particles and filtering the fine regenerated aggregate particles are realized;
2) the equipment adopts a rotary spraying device, effectively forms a strengthening liquid atomization environment to ensure that the surfaces of regenerated aggregate particles are uniformly covered with strengthening liquid, and can effectively save the using amount of the strengthening liquid compared with a soaking method;
3) the combination of the rotary bin and the multiple layers of vibrating screens realizes the functional equipment integrating weak attached slurry clearing, strengthening, drying and particle screening of regenerated aggregate particles.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a block diagram of a surface strengthening apparatus for recycled aggregate particles according to an embodiment of the present invention;
FIG. 2 is a graph showing the results of a strength test of recycled aggregate particles after treatment by the present invention;
FIG. 3 is a graph of the change in the pore characteristics of the reclaimed aggregate particles after treatment by the present invention;
fig. 4 is a graph showing the test results of the reclaimed aggregate particles SCB after being treated by the present invention.
Description of reference numerals:
1. an outer bin; 2. rotating the bin; 3. a rotary spraying device; 4. a vent; 5. a dust suction port; 6. rotating the bin screen; 7. a multi-layer vibrating screen; 8. a filter screen; 9. a top cover of the outer bin; 10. an outer bin side cover; 11. a first external motor; 12. a second external motor; 13. a reinforcement liquid container; 14. a reinforced liquid recovery port.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1, a reclaimed aggregate particle surface strengthening apparatus includes:
the left side of the upper part of the outer bin 1 is provided with a ventilation opening 4, and the right side of the upper part of the outer bin is provided with a dust collection opening 5; an outer bin side cover 10 is arranged at the left opening of the lower part; an outer bin top cover 9 is arranged at the opening at the top; the bottom is provided with a reinforced liquid recovery port 14;
the rotary bin 2 is of a cylindrical structure consisting of a framework and a rotary bin screen 6 covering the framework; the rotary bin 2 is rotatably arranged at the upper part of the inner cavity of the outer bin 1 under the driving of a second outer motor 12; one end surface of the rotary bin 2 is opposite to the ventilation opening 4, and the other end surface of the rotary bin is opposite to the dust collection opening 5;
a rotary spraying device 3 which is rotatably installed in the rotary bin 2 and is driven by a motor to rotate in the opposite direction of the rotary bin 2;
a strengthening liquid container 13 communicated with the rotary spraying device 3 through a pipeline;
a multi-layer vibrating screen 7 driven by a first external motor 11 and arranged at the lower part of the inner cavity of the outer bin 1 and below the rotating bin 2;
and the filter screen 8 is arranged at the bottom of the inner cavity of the outer bin 1 and is positioned below the multiple layers of vibrating screens 7.
The operation method of the regenerated aggregate particle surface strengthening equipment is as follows:
1) the method comprises the following steps of (1) initially crushing waste cement concrete, pouring the crushed waste cement concrete into a rotary bin 2, pre-installing a plurality of groups of rotary bin screens 6 with certain apertures in the rotary bin 2 according to actual requirements, and installing the last group of rotary bin screens 6 after pouring regenerated aggregate particles;
2) the second external motor 12 is started to drive the rotary bin 2 to rotate at a certain angular speed, and meanwhile, the ventilation opening 4 and the dust collection opening 5 are started to quickly remove fine powder and fine particles generated by mutual impact of regenerated aggregate particles;
3) the angular speed of the rotating bin 2 is controlled to be between 20 r/min and 60 r/min, and the rotating time is controlled to be between 1 minute and 10 minutes;
4) starting a motor connected with the rotary spraying device 3, driving the rotary spraying device 3 to rotate and spray the strengthening liquid at the same angular speed in the direction opposite to that of the rotary bin 2 by the motor, wherein the duration time is not less than 5 minutes;
5) closing the rotary spraying device 3 and stopping rotating the rotary spraying device, continuously operating the rotary bin 2 for 5-10 minutes to ensure the surface of the regenerated aggregate particles to be air-dried, re-opening the rotary spraying device 3 and rotating the rotary spraying device, spraying diluted resin solution heated to 90 degrees, and continuing for 1 minute; the rotary bin 2, the ventilation opening 4 and the dust collection opening 5 continue to work for 10 minutes, and the operation is stopped after the diluted resin forms certain curing strength, so that reinforced regenerated aggregate particles are obtained;
6) according to the screening requirement, respectively placing a plurality of layers of vibrating screens 7 with different apertures;
7) opening any group of rotary bin screens 6 to enable the reinforced regenerated aggregate particles to fall into the uppermost layer of the multiple layers of vibrating screens 7; starting a first external motor 11, driving the multilayer vibrating screen 7 by the first external motor 11, and controlling the vibration time to be 5-10 minutes when regenerated aggregate particles pass through the multilayer vibrating screen 7 according to the particle size;
8) and after the vibration is finished, respectively taking out the vibration screens with different sizes to obtain regenerated aggregate particles distributed according to the standard particle size.
Specifically, the regenerated aggregate particle surface strengthening equipment comprises an outer bin 1, a rotary bin 2, a rotary spraying device 3, a multi-layer vibrating screen 7, a filter screen 8, a first external motor 11, a second external motor 12 and a strengthening liquid container 13.
The outer bin 1 is a cubic box body made of metal materials, the left side of the upper part of the outer bin is provided with a ventilation opening 4, and the right side of the upper part of the outer bin is provided with a dust collection opening 5; an outer bin side cover 10 is arranged at the left opening of the lower part; an outer bin top cover 9 is arranged at the opening at the top; the bottom is provided with a reinforced liquid recovery port 14. Four ventilation openings 4 are evenly formed in the left side of the upper portion of the outer bin 1, four dust suction openings 5 are evenly formed in the right side of the upper portion of the outer bin, and the dust suction openings 5 correspond to the ventilation openings 4 one to one.
The four ventilation openings 4 on the left outer bin wall are used for blowing cold air or high-temperature air into the outer bin 1, the cold air is used for removing dust, and the high-temperature air is used for heating regenerated aggregate particles, so that weak floating pulp on the surface can be peeled off, and the surface drying can be accelerated after the reinforcing liquid is sprayed. Four dust suction ports 5 correspondingly arranged on the wall of the right outer bin are used for exhausting air.
The rotary bin 2 is a cylindrical structure composed of a framework and a rotary bin screen 6 covering the framework. The rotary bin 2 is rotatably mounted on the upper part of the inner cavity of the outer bin 1 by the driving of a second outer motor 12. The end surface of one side of the rotary bin 2 is opposite to the ventilation opening 4, and the end surface of the other side is opposite to the dust collection opening 5.
In this embodiment, the framework of the rotary bin 2 is an octagonal cylindrical steel frame, and eight side faces of the rotary bin can be replaced with rotary bin screens 6 with the aperture between 1.18mm and 26mm according to the screening requirement of the regenerated aggregate particles.
The rotary bin 2 is driven to rotate by a second external motor 12 placed outside the outer bin 1, regenerated aggregate particles with certain mass are poured into the rotary bin 2, then the rotary bin 2 runs at a fixed angular speed, and weak surface laitance is removed through mutual collision among the regenerated aggregate particles.
The rotary spraying device 3 is rotatably installed in the rotary bin 2 and is driven by a motor to rotate in the opposite direction of the rotary bin 2. The strengthening liquid container 13 is communicated with the rotary spraying device 3 through a pipeline. The reinforcing liquid container 13 is used for holding the reinforcing liquid and the 90 ° diluted resin solution.
Rotatory spray set 3 includes four pipelines, evenly is equipped with a plurality of shower nozzles along the axial on every pipeline, these four pipelines along the mutual parallel arrangement of axial of rotatory storehouse 2, the internal surface of rotatory storehouse 2 is pressed close to these four pipelines and is the cross around this axis of rotatory storehouse 2 and arranges, and four pipelines are in the tip with one side and link to each other through a cross pipeline, and this cross pipeline center department is connected with motor drive, the cross pipeline drives four pipelines and shower nozzle and rotatory storehouse 2 reverse rotation on it under the drive of motor (the motor is placed outside storehouse 1), and angular velocity is adjustable and slightly less than the angular velocity of rotatory storehouse 2. The four pipelines are communicated with the strengthening liquid container 13 through pipelines. The spray heads on the four pipelines can be replaced according to the spraying requirements of different strengthening liquids. Furthermore, the four pipes are arranged close to the inner surface of the rotary bin 2 and in a cross arrangement around the axis of the rotary bin 2, so that the spraying areas of the four pipes can cover the whole rotary bin 2.
The multi-layer vibrating screen 7 is driven by a first external motor 11 (the first external motor 11 is placed outside the outer bin 1) and is arranged at the lower part of the inner cavity of the outer bin 1 and below the rotating bin 2. The filter screen 8 is arranged at the bottom of the inner cavity of the outer bin 1 and is positioned below the multiple layers of vibrating screens 7.
The multi-layer vibrating screen 7 and the filter screen 8 can be respectively arranged on the guide rails in the outer bin 1. A first guide rail extending horizontally is fixedly arranged at the bottom of an inner cavity of the outer bin 1, a second guide rail extending horizontally is fixedly arranged above the first guide rail, the second guide rail is parallel to the first guide rail, and two ends of the second guide rail are fixed with the inner wall of the outer bin 1. A multi-layer vibrating screen 7 is slidably mounted on the second rail, and a filter screen 8 is slidably mounted on the first rail. The outer bin side cover 10 is opened, the horizontal positions of the multi-layer vibrating screen 7 and the filter screen 8 can be manually adjusted from the opening, after the positions are selected, the multi-layer vibrating screen 7 can be fixed on the second guide rail in a bolt connection mode, and the filter screen 8 is fixed on the first guide rail. In addition, the multi-layer vibrating screen 7 and the filter screen 8 can be drawn out from the opening corresponding to the outer bin side cover 10.
In addition to the manual adjustment mode, an automatic adjustment mode can be adopted, different electric push rods push the multiple layers of vibrating screens 7 and the filter screens 8 to move on respective guide rails, and after the electric push rods are pushed in place, the electric push rods are closed.
The multilayer vibrating screen 7 comprises screens with different apertures in a dry group, and effectively improves the screening efficiency of regenerated aggregate particles. The aperture of the screen in the multilayer vibrating screen 7 is between 4.75mm and 16 mm. The aperture of the filter screen 8 is 0.075 mm. The multi-layer vibrating screen 7 is used for collecting the regenerated aggregate particles subjected to strengthening treatment from the rotary bin 2 and screening the regenerated aggregate particles according to particle sizes, the filter screen 8 is used for filtering fine impurities and filtering and spraying redundant strengthening liquid, the bottom of the outer bin 1 is provided with a strengthening liquid recovery port 14, and the redundant strengthening liquid can flow out from the strengthening liquid recovery port 14.
Above-mentioned regeneration aggregate particle surface strengthening equipment opens outer storehouse top cap 9, installs seven groups of aperture for 23 mm's rotatory storehouse screen cloth on seven sides in rotatory storehouse 2, then pours into regeneration aggregate particle into rotatory storehouse 2, and the back that finishes, installs last a set of rotatory storehouse screen cloth 6 (the aperture is 23mm), opens outer storehouse side cap 10 simultaneously and installs the filter screen 8 that the aperture is 0.075 mm.
And closing the outer bin top cover 9 and the outer bin side cover 10, starting the second external motor 12, adjusting the rotating speed to 50 r/min, simultaneously opening the ventilation opening 4 and the dust suction opening 5, and setting the rotating time of the rotating bin 2 to be 5 min so as to fully remove weak floating ash on the surface of the regenerated aggregate particles. Then, the air vent 4 and the dust suction port 5 are closed, the motor connected with the rotary spraying device 3 is started at the same time, the rotary spraying device 3 is driven by the motor to rotate, the rotating speed is set to be 40 r/min, and the direction is opposite to the direction of the rotary bin 2. The rotary spraying device 3 is opened, and the sodium silicate aqueous solution is sprayed through the spraying device 3, wherein the spraying time is set to be 5 minutes. And closing the rotary spraying device 3 and stopping rotating the rotary spraying device, opening the ventilation opening 4 and the dust suction opening 5, and continuously operating the rotary bin 2 for 5 minutes to ensure that the surfaces of the regenerated particles are air-dried. The rotary spray device 3 is turned on again, the air vent 4 and the dust suction port 5 are closed, and the diluted resin solution heated to 90 ° is sprayed by the rotary spray device 3 for 1 minute. And finally, closing the rotary spraying device 3 and stopping rotating, keeping the rotary bin 2, the vent 4 and the dust collection port 5 continuously operating for 10 minutes, stopping the rotary bin 2 after the resin forms certain curing strength, and closing the vent 4 and the dust collection port 5 to obtain the reinforced regenerated aggregate particles.
The side cover 10 of the outer bin is opened, and a multi-layer vibration screen 7 consisting of four groups of screens is placed, wherein the apertures of the multi-layer vibration screen are respectively 16mm, 13.2mm, 9.5mm and 4.75 mm. The outer-bin-side cover 10 is then closed. And (3) opening any group of rotary bin screen meshes 6 on the rotary bin 2, starting the first external motor 11, and screening the reinforced regenerated aggregate particles layer by layer according to the particle size for 5 minutes. After stopping, the side cover 10 of the outer bin is opened, and the multi-layer vibrating screen 7 is drawn out to obtain the reinforced regenerated aggregate particles distributed according to the particle size.
According to the test methods of aggregate particles and asphalt concrete in the highway engineering aggregate design regulation (JTG E42-2005) and the highway engineering asphalt and asphalt mixture test regulation (JTG E20-2011), tests are carried out on the reinforced regenerated aggregate particles prepared by adopting the equipment and the operation method as raw materials. Fig. 2 and fig. 3 are a comparison of the water absorption and the crushing value before and after the reinforcement of the regenerated aggregate particles, and it can be seen from the graphs that the water absorption and the crushing value after the reinforcement of the regenerated aggregate particles are respectively improved by more than 30% and 20% compared with those before the reinforcement, and it can be seen that the above-mentioned apparatus and operation method can effectively remove weak floating ash from the regenerated aggregate particles, fill the micropores, and wrap the high strength resin.
The design and testing of asphalt concrete was carried out using recycled aggregate particles, and table 1 shows the grading parameter and the oilstone ratio determined by the marshall design method.
TABLE 1
Selecting 0%, 25%, 50%, 75% and 100% as substitute amount of the reinforced recycled aggregate particles, respectively preparing corresponding asphalt concrete, and carrying out performance test. FIG. 4 is a semi-circular splitting test result, which shows that the crack resistance of the asphalt concrete doped with the reinforced recycled aggregate particles is not reduced obviously.
The surface strengthening equipment for the regenerated aggregate particles and the operation method thereof have the following beneficial effects:
1) the rotary bin can replace the screen of the rotary bin according to actual needs, so that the functions of effectively removing weak floating slurry on the surface of the regenerated aggregate particles and filtering the fine regenerated aggregate particles are realized;
2) the equipment adopts a rotary spraying device, effectively forms a strengthening liquid atomization environment to ensure that the surfaces of regenerated aggregate particles are uniformly covered with strengthening liquid, and can effectively save the using amount of the strengthening liquid compared with a soaking method;
3) the combination of the rotary bin and the multiple layers of vibrating screens realizes the functional equipment integrating weak attached slurry clearing, strengthening, drying and particle screening of regenerated aggregate particles.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (7)
1. A reclaimed aggregate particle surface strengthening apparatus, comprising:
the left side of the upper part of the outer bin is provided with a ventilation opening, and the right side of the upper part of the outer bin is provided with a dust collection opening; an outer bin side cover is arranged at the left opening of the lower part of the; an outer bin top cover is arranged at the opening at the top; the bottom is provided with a reinforced liquid recovery port;
the rotary bin is of a cylindrical structure consisting of a framework and a rotary bin screen covered outside the framework; the rotary bin is rotatably arranged at the upper part of the inner cavity of the outer bin under the driving of a second outer motor; one end surface of the rotary bin is opposite to the ventilation opening, and the other end surface of the rotary bin is opposite to the dust collection opening;
the rotary spraying device is rotatably arranged in the rotary bin and driven by the motor to rotate in the opposite direction of the rotary bin;
the strengthening liquid container is communicated with the rotary spraying device through a pipeline;
the multi-layer vibrating screen is driven by a first external motor, is arranged at the lower part of the inner cavity of the outer bin and is positioned below the rotating bin;
the filter screen is arranged at the bottom of the inner cavity of the outer bin and is positioned below the multiple layers of vibrating screen screens;
the multi-layer vibrating screen comprises a plurality of groups of screens with different apertures;
the framework of the rotary bin is an octagonal columnar steel frame, and eight side faces of the rotary bin are provided with rotary bin screens with the aperture of 1.18-26 mm according to the screening requirement of regenerated aggregate particles;
the rotary spraying device comprises four pipelines, wherein a plurality of spray heads are uniformly arranged on each pipeline along the axial direction, the four pipelines are arranged in parallel along the axial direction of the rotary bin, the four pipelines are close to the inner surface of the rotary bin and are arranged in a cross shape around the axis of the rotary bin, the end parts of the four pipelines on the same side are connected through a cross-shaped pipeline, the center of the cross-shaped pipeline is in transmission connection with a motor, and the cross-shaped pipeline drives the four pipelines and the spray heads and the rotary bin on the four pipelines to rotate reversely under the driving of the motor; the four pipelines are communicated with the strengthening liquid container through pipelines.
2. The apparatus for surface strengthening of reclaimed aggregate particles according to claim 1, wherein the outer bin is a cubic box made of a metal material.
3. The apparatus for surface-strengthening reclaimed aggregate particles according to claim 1, wherein the plurality of layers of vibratory screens and the filter net are respectively installed on guide rails in the outer bin.
4. The apparatus for surface strengthening of reclaimed aggregate particles according to claim 1, wherein the mesh size of the screen in the multi-layer vibrating screen is between 4.75mm and 16 mm.
5. The apparatus for surface strengthening of regenerated aggregate particles according to claim 4, wherein the filter screen has a pore size of 0.075 mm.
6. The apparatus for surface strengthening of recycled aggregate particles according to claim 1, wherein four of said ventilation openings are uniformly opened on the left side of the upper portion of said outer bin, four of said dust suction openings are uniformly opened on the right side of the upper portion of said outer bin, and said dust suction openings correspond to said ventilation openings one to one.
7. A method of operating a regenerative aggregate particle surface enhancing apparatus according to any one of claims 1 to 6, the method of operation comprising:
1) the method comprises the following steps of (1) initially crushing waste cement concrete, pouring the crushed waste cement concrete into a rotary bin, pre-installing a plurality of groups of rotary bin screens with certain apertures in the rotary bin according to actual requirements, and installing the last group of rotary bin screens after pouring regenerated aggregate particles;
2) starting a second external motor to drive the rotary bin to rotate at a certain angular speed, and simultaneously starting the ventilation opening and the dust collection opening to quickly remove fine powder and fine particles generated by mutual impact of regenerated aggregate particles;
3) the angular speed of the rotating bin is controlled to be 20 r/min-60 r/min, and the rotating time is controlled to be 1 min-10 min;
4) starting a motor connected with the rotary spraying device, driving the rotary spraying device to rotate and spray the strengthening liquid at the same angular speed in the direction opposite to the rotary bin by the motor, wherein the duration time is not less than 5 minutes;
5) closing the rotary spraying device and stopping rotating the rotary spraying device, continuously operating the rotary bin for 5-10 minutes to ensure that the surface of the regenerated aggregate particles is air-dried, re-starting the rotary spraying device and rotating the rotary spraying device, spraying diluted resin solution heated to 90 degrees, and continuing for 1 minute; the rotary bin, the ventilation opening and the dust collection opening continue to work for 10 minutes, and the operation is stopped after the diluted resin forms certain curing strength, so that reinforced regenerated aggregate particles are obtained;
6) respectively placing a plurality of layers of vibrating screens with different apertures according to the screening requirement;
7) opening any group of rotary bin screens to enable the reinforced regenerated aggregate particles to fall into the uppermost layer of the multiple layers of vibrating screens; starting a first external motor, driving the multilayer vibrating screen by the first external motor, enabling the regenerated aggregate particles to pass through the multilayer vibrating screen according to the particle size, and controlling the vibration time to be 5-10 minutes;
8) and after the vibration is finished, respectively taking out the vibration screens with different sizes to obtain regenerated aggregate particles distributed according to the standard particle size.
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