CN111892318A - Recycled concrete aggregate screening system - Google Patents
Recycled concrete aggregate screening system Download PDFInfo
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- CN111892318A CN111892318A CN202010924839.XA CN202010924839A CN111892318A CN 111892318 A CN111892318 A CN 111892318A CN 202010924839 A CN202010924839 A CN 202010924839A CN 111892318 A CN111892318 A CN 111892318A
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- centrifugal
- box
- recycled concrete
- concrete aggregate
- screening system
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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
- C04B20/02—Treatment
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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
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Crushing And Pulverization Processes (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a recycled concrete aggregate screening system which comprises a separation module and a screening module connected with the separation module through a pipeline; the separation module comprises a centrifugal box, a centrifugal driving motor arranged at the bottom of the centrifugal box and a turntable arranged at the upper side of the centrifugal driving motor, wherein the outer part of the centrifugal box is a cylinder, the inner part of the centrifugal box is provided with a conical centrifugal bin with the diameter gradually decreasing downwards, the top of the centrifugal box is provided with a feeding hole, and the side surface of the centrifugal box is provided with a plurality of discharging holes; the screening module is including establishing the screening case in separator box one side, the top fixedly connected with sieve of screening case, the below of sieve is equipped with a plurality of material receiving mouth, material receiving box is placed to the below of material receiving mouth. The invention has the effects of separating brick materials from concrete materials and separating concrete materials with different volumes, and simultaneously, when the brick materials are separated from the concrete materials, the invention does not need to provide power, and is energy-saving and environment-friendly.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a recycled concrete aggregate screening system.
Background
With the continuous acceleration of the urbanization process of the country, the quantity of construction waste in cities is rapidly increased. People can enjoy urban civilization and suffer from the trouble caused by urban garbage. At present, the demand of China for building materials is continuously increased in urbanization development, and corresponding raw material collection is also reduced in China, so that the price of building resources is continuously increased and the resource exploitation is increasingly difficult. The recycled concrete feeding is to crush the construction waste, primarily screen the construction waste, finally classify the aggregates according to the size of the material diameter, and perform corresponding processes on different aggregates for reutilization.
The prior art has the following defects: the efficiency of aggregate sorting is not high, and the sorted brick aggregate and concrete aggregate are mixed together and are difficult to be used as a building aggregate substitute.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a recycled concrete aggregate screening system which has high aggregate sorting efficiency and can separate brick aggregates from concrete aggregates.
The above object of the present invention is achieved by the following technical solutions:
a recycled concrete aggregate screening system comprises a separation module and a screening module connected with the separation module through a pipeline;
the separation module comprises a centrifugal box, a centrifugal driving motor arranged at the bottom of the centrifugal box and a turntable arranged at the upper side of the centrifugal driving motor, wherein the outer part of the centrifugal box is a cylinder, the inner part of the centrifugal box is provided with a conical centrifugal bin with the diameter gradually decreasing downwards, the top of the centrifugal box is provided with a feeding hole, and the side surface of the centrifugal box is provided with a plurality of discharging holes;
the screening module is including establishing the screening case in separator box one side, the top fixedly connected with sieve of screening case, the below of sieve is equipped with a plurality of material receiving mouth, material receiving box is placed to the below of material receiving mouth.
Through adopting above-mentioned technical scheme, the recycled concrete aggregate of centrifuge box can be circular motion under the drive of carousel, and the aggregate that the quality is lighter can be located the upper portion of centrifuge box under the effect of centrifugal force, and the aggregate that the quality is great is located the bottom of centrifuge box, and the aggregate of different qualities can the layering. The recycled concrete aggregate comprises brick materials and concrete materials, and compared with the concrete materials, the brick materials have smaller mass and larger volume, and the aggregate separated from the upper layer part of the centrifugal box comprises the concrete materials with smaller volume and the brick materials with larger volume. The aggregate is sent to the upper part of the screening box through a pipeline, and the screening plate on the screening box can separate concrete materials with small volume from brick materials with large volume.
The present invention in a preferred example may be further configured to: the centrifugal driving motor is fixedly connected to the center of the bottom of the centrifugal box, one end of a centrifugal output shaft of the centrifugal driving motor is fixedly connected to the center of the lower surface of the turntable, and the side wall of the turntable is connected to the inner wall of the bottom of the centrifugal box in a sliding mode.
Through adopting above-mentioned technical scheme, centrifugal driving motor drives the carousel and rotates, and the carousel drives the aggregate in the centrifuge box and makes circular motion to make the aggregate produce centrifugal force.
The present invention in a preferred example may be further configured to: the upper surface of the turntable is provided with four vertically crossed shifting plates.
Through adopting above-mentioned technical scheme, dial the board and can increase the area of contact and the frictional force of carousel and aggregate, be favorable to the aggregate to accelerate in the centrifugal box.
The present invention in a preferred example may be further configured to: a safety cover plate is hinged to the feed inlet.
Through adopting above-mentioned technical scheme, when reinforced in the centrifugal box, open safety cover, at centrifugal driving motor during operation, cover safety cover, prevent that the aggregate in the centrifugal box when being circular motion, the centrifugal box of flying off under the effect of centrifugal force has eliminated the potential safety hazard.
The present invention in a preferred example may be further configured to: the discharge ports are opposite in vertical position and are arranged on the inner wall of the centrifugal box.
Through adopting above-mentioned technical scheme, set up the discharge gate at the height of difference, conveniently with the aggregate roll-off of co-altitude not.
The present invention in a preferred example may be further configured to: the side wall of the centrifugal box feeding port is provided with a vertical chute which can be upwards, and a baffle which can be upwards pulled out is arranged in the chute.
Through adopting above-mentioned technical scheme, before the aggregate layering is unstable, with the baffle lid on the discharge gate, prevent that the aggregate from the discharge gate roll-off, after the layering is stable, extract the apron again from the spout, the aggregate is followed the discharge gate roll-off.
The present invention in a preferred example may be further configured to: the highest discharge port is fixedly connected with a material guiding pipe, the rest discharge ports are fixedly connected with a material discharging pipe, and a material receiving box is placed below an outlet of the material discharging pipe.
Through adopting above-mentioned technical scheme, place the material receiving box in the exit of discharging pipe, the aggregate that can effectual management separation conveniently takes, has avoided the aggregate that separates to mix together once more.
The present invention in a preferred example may be further configured to: the outlet of the material guiding pipe is arranged above the screening box.
Through adopting above-mentioned technical scheme, draw the aggregate on centrifuge box inner upper strata to the top of screening case, utilize the sieve to separate the screening with the aggregate of different volumes.
The present invention in a preferred example may be further configured to: the sieve plate is obliquely arranged, and one end, close to the material guiding pipe, of the sieve plate is higher than the other end of the sieve plate.
Through adopting above-mentioned technical scheme, the aggregate on the sieve rolls to the low end under the effect of gravity, need not providing vibration power for the sieve, and the noise of equipment is lower, and is more energy-concerving and environment-protective.
The present invention in a preferred example may be further configured to: and a plurality of blanking troughs are formed in the sieve plate, and the trough diameter of each blanking trough is gradually increased from high to low.
By adopting the technical scheme, in the process of rolling the aggregates, the aggregates with smaller volume can fall on the receiving box below the charging chute before the aggregates with larger volume.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the recycled concrete aggregate in the centrifugal box can be driven by the turntable to perform circular motion, the aggregate with lighter mass can be located on the upper portion of the centrifugal box under the action of centrifugal force, the aggregate with larger mass is located at the bottom of the centrifugal box, and the aggregates with different masses can be layered. The recycled concrete aggregate comprises brick materials and concrete materials, and compared with the concrete materials, the brick materials have smaller mass and larger volume, and the aggregate separated from the upper layer part of the centrifugal box comprises the concrete materials with smaller volume and the brick materials with larger volume. The aggregate is sent to the upper part of the screening box through a pipeline, and a sieve plate on the screening box can separate concrete materials with small volume from brick materials with large volume;
2. the aggregate on the sieve plate rolls towards the lower end under the action of gravity, vibration power does not need to be provided for the sieve plate, the complexity of the whole structure is reduced, the failure rate is low, and the maintenance is convenient; the manufacturing cost and the running cost of the equipment are reduced, and the equipment is more energy-saving and environment-friendly.
Drawings
Fig. 1 is a schematic perspective view of the present embodiment.
Fig. 2 is a schematic view of the internal structure of the present embodiment.
In the figure, the device comprises a separation module 1, a separation module 11, a centrifugal box 111, a discharge hole 12, a centrifugal driving motor 13, a rotary disc 14, a safety cover plate 15, a baffle plate 16, a material guiding pipe 17, a material discharging pipe 2, a screening module 21, a screening box 22, a screen plate 221, a blanking groove 23, a material receiving hole 3 and a material receiving box.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, the recycled concrete aggregate screening system disclosed by the invention comprises a separation module 1 and a screening module 2 connected with the separation module 1 through a pipeline. The separation module 1 comprises a centrifugal box 11, a plurality of discharge holes 111 are formed in the side face of the centrifugal box 11, the discharge holes 111 are opposite in upper and lower positions and are arranged on the inner wall of the centrifugal box 11, a material guiding pipe 16 is connected to the highest discharge hole 111 through a flange, the outlet of the material guiding pipe 16 is arranged above the screening module 2, discharge pipes 17 are connected to the rest discharge holes 111 through flanges, and a material receiving box 3 is arranged below the outlet of each discharge pipe 17.
Referring to fig. 1, the screening module 2 includes a screening box 21 disposed below the outlet of the material guiding pipe 16, a screening plate 22 is disposed at the top of the screening box 21, the screening plate 22 is disposed in an inclined manner, and one end of the screening plate 22 close to the outlet of the material guiding pipe 16 is higher than the other end; seted up a plurality of charging chute 221 on sieve 22, charging chute 221's groove width is from high to low crescent, is equipped with three material receiving opening 23 in charging chute 221's below along charging chute 221 length direction, has placed material receiving box 3 in the below of material receiving opening 23.
The separated aggregate flows out of the discharge pipe 16 and falls into the material receiving box 3; the aggregate with light weight flows out of the material guiding pipe 17, wherein the aggregate comprises concrete with small volume and brick with large volume, the aggregate is placed on the sieve plate 22, the aggregate starts to roll under the action of gravity, the concrete with small volume falls into the material receiving port 23 from the chute 221 before the brick with large volume, and falls into the material receiving box 3, so that the concrete and the brick are separated.
Referring to fig. 2, the separation module 1 comprises a centrifuge box 11, and the centrifuge box 1 has an outer shape of a cylinder and an inner portion provided with a conical centrifuge chamber having a diameter gradually decreasing downward. The bottom of the centrifugal box 1 is provided with a cylindrical cavity, the center of the cavity corresponds to the center of the rotary table 13, a centrifugal driving motor 12 is fixedly connected with the center of the bottom surface of the cavity through a bolt, a centrifugal output shaft extends out of the center of the top end of the centrifugal driving motor 12, the top end of the centrifugal output shaft is connected with the rotary table 13 in a key mode, a circle of sliding blocks are arranged on the side surface of the rotary table 13, a circle of sliding grooves are arranged on the side surface of the bottom of the centrifugal box 1, the rotary table 13 is connected with the centrifugal box 11 in a sliding mode through the matching of the sliding blocks and the sliding grooves, and the bottom surface of the rotary table.
Four crossed shifting plates are vertically arranged on the upper surface of the rotary table 13, and the rotary table 13 is a steel plate with higher strength and can be made of other materials with high strength and light weight. The bottom surface of carousel 13 and the bottom surface of centrifuge chamber 11 contactless, when avoiding carousel 13 to rotate, the two produces the friction, reduces the centrifugal efficiency of aggregate, and carousel 13 of high strength material has guaranteed that more aggregate of adding can not take place to warp in centrifuge chamber 11 yet.
The material of the box body of the centrifugal box 11 is preferably high-strength cement, the strength and the mass of the high-strength cement box body are large, and a part of the bottom end of the high-strength cement box body is buried in the ground. The embedding depth depends on the rated power of the centrifugal driving motor 12, the aggregate with larger total mass can be centrifugally separated by the centrifugal driving motor 12 with larger rated power, the larger centrifugal force is generated in the process, and the deeper the embedding depth of the centrifugal box 11 into the ground, the heavier the mass of the box body, and the more stable the whole equipment is. Under the effect of centrifugal force, the aggregate can corrode the box inner wall of centrifugal box 11, and the high-strength box has guaranteed the life of equipment.
The top of the centrifugal box 11 is provided with a circular feed inlet, the feed inlet is hinged with a circular safety cover plate 14, the inner wall of the centrifugal box 11 and the discharge hole 111 are provided with a longitudinal sliding groove, and the inside of the sliding groove is provided with a baffle 15 which can be pulled out upwards. At the beginning of centrifugal separation, the aggregate in the centrifugal box 11 is not layered stably, at this time, the baffle 15 is inserted into the chute to block the discharge port 111, and the aggregate with unstable layering is prevented from flowing out from the discharge port 111 to affect the separation efficiency of the centrifugal box 11. After the aggregate in the centrifugal box 11 is layered and stabilized, the baffle 15 is pulled out from the chute, and the layered and stabilized aggregate flows out from the discharge port 111.
Referring to fig. 2, the discharge pipe 17 is divided into two parts, the first part is inclined obliquely downwards to form an included angle of 5 to 15 degrees with the horizontal line, and the included angle is 10 degrees in the embodiment; the first portion and the second portion form an included angle of 100 to 130 degrees, in this embodiment 120 degrees. The first portion is arranged obliquely downwards to facilitate the outflow of the aggregates in the centrifuge tank 11 from the discharge pipe 17.
The draft tube 16 is also divided into a first part and a second part similarly to the discharge tube 17, the first part is inclined obliquely downwards and forms an included angle of 5 to 15 degrees with the horizontal line, and the included angle is 10 degrees in the embodiment; the first portion and the second portion are angled at an angle of 150 to 180 degrees, in this embodiment 170 degrees. The slope of the drainage tube 16 is set to be smaller, so that the flowing speed of aggregate in the drainage tube 16 is delayed, and the influence on the screening efficiency of the screening module caused by the overlarge speed of the aggregate flowing out of the drainage tube 16 and reaching the screen plate is avoided.
In this embodiment, the separated and screened aggregate is contained in the receiving box 3. In order to facilitate subsequent processing work, conveying belts can be placed at the outlet of the discharge pipe 17 and below the receiving port 23, and separated and screened aggregates can be conveyed to a place to be processed when a conveying truck stops at the outlet of the discharge pipe 17 and below the receiving port 23.
When the invention is used, the safety cover plate 14 is opened, aggregates which are not subjected to separation and screening are added from the feeding hole, the safety cover plate 14 is covered, the baffle plate 15 is inserted into the chute, the discharging hole is blocked, and the centrifugal driving motor 12 is started. The centrifugal driving motor 12 drives the rotary disc 13 to rotate; under the effect of dialling the board on carousel 13 and carousel 13, the aggregate can paste the inner wall rotation at centrifuge box 11, and under the effect of centrifugal force, the brick material that the quality is lighter, the volume is great and the concrete material that the volume is less can distribute gradually in the upper strata, and the concrete material that the quality is heavier, the volume is great can distribute in the lower floor. After the aggregate in the centrifugal box 11 is layered and stabilized, the baffle 15 is pulled out, and the aggregate in the centrifugal box 11 flows out from the discharge hole under the action of centrifugal force. The concrete material with heavier mass and larger volume falls into different material receiving boxes 3 through a discharge pipe 17; the brick material with light weight and large volume and the concrete material with small volume enter the screening box under the guide of the material guiding pipe 16, and the brick material and the concrete material are separated and finally fall into different material receiving boxes 3.
When separating the brick material with lighter weight and larger volume from the concrete material with smaller volume, the aggregate flowing out of the material guiding pipe 16 rolls on the sieve plate 22 under the action of gravity, and the concrete material with smaller volume falls into the material receiving port 23 from the chute 221 before the brick material with larger volume and falls into the material receiving box 3, so that the concrete material is separated from the brick material. In the process, the sieve plate 22 does not need to be vibrated, power is provided for the screening module 2, the complexity of the whole structure is reduced, the failure rate is low, and the maintenance is convenient; the manufacturing cost and the running cost of the equipment are reduced, and the equipment is more energy-saving and environment-friendly.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a recycled concrete aggregate screening system which characterized in that: comprises a separation module (1) and a screening module (2) connected with the separation module (1) through a pipeline;
the separation module (1) comprises a centrifugal box (11), a centrifugal driving motor (12) arranged at the bottom of the centrifugal box (11) and a rotary table (13) arranged on the upper side of the centrifugal driving motor (12), wherein the outer part of the centrifugal box (11) is a cylinder, a conical centrifugal bin with the diameter gradually decreasing downwards is arranged in the centrifugal box, a feeding hole is formed in the top of the inner part of the centrifugal box (11), and a plurality of discharging holes (111) are formed in the side surface of the inner part of the centrifugal box (11);
screening module (2) is including establishing screening case (21) in centrifuge box (11) one side, the top fixedly connected with sieve (22) of screening case (21), the below of sieve (22) is equipped with a plurality of material receiving mouth (23), material receiving box (3) are placed to the below of material receiving mouth (23).
2. The recycled concrete aggregate screening system of claim 1, wherein: centrifugal drive motor (12) fixed connection puts at the bottom central point of centrifuge box (11), the centrifugal output shaft top fixed connection of centrifugal drive motor (12) puts at the lower surface central point of carousel (13), the lateral wall sliding connection of carousel (13) is on the bottom inner wall of centrifuge box (11).
3. The recycled concrete aggregate screening system of claim 2, wherein: the upper surface of the rotary table (13) is provided with four vertically crossed shifting plates.
4. The recycled concrete aggregate screening system of claim 1, wherein: a safety cover plate (14) is hinged to the feed inlet.
5. The recycled concrete aggregate screening system of claim 4, wherein: the discharge ports (111) are opposite in upper and lower positions and are arranged on the inner wall of the centrifugal box (11).
6. The recycled concrete aggregate screening system of claim 5, wherein: the side wall of the discharge opening of the centrifugal box (11) is provided with a sliding chute which extends upwards, and a baffle (15) which can be pulled out upwards is arranged in the sliding chute.
7. The recycled concrete aggregate screening system of claim 6, wherein: the top discharge port (111) is fixedly connected with a material guiding pipe (16), the rest discharge port (111) is fixedly connected with a material discharging pipe (17), and a material receiving box (3) is placed below an outlet of the material discharging pipe (17).
8. The recycled concrete aggregate screening system of claim 7, wherein: the outlet of the material guiding pipe (16) is arranged above the screening box (21).
9. The recycled concrete aggregate screening system of claim 1, wherein: the sieve plate (22) is obliquely arranged, and one end, close to the material guiding pipe (16), of the sieve plate (22) is higher than the other end of the sieve plate.
10. The recycled concrete aggregate screening system of claim 9, wherein: the sieve plate (22) is provided with a plurality of blanking troughs (221), and the trough diameter of each blanking trough (221) is gradually increased from high to low.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020106248010 | 2020-07-01 | ||
| CN202010624801 | 2020-07-01 |
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| Publication Number | Publication Date |
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| CN111892318A true CN111892318A (en) | 2020-11-06 |
| CN111892318B CN111892318B (en) | 2022-08-23 |
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| CN202010924839.XA Active CN111892318B (en) | 2020-07-01 | 2020-09-05 | Recycled concrete aggregate screening system |
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| CN110280471A (en) * | 2019-08-02 | 2019-09-27 | 张再兴 | A kind of building waste residue sifter separating scum by rotary centrifugal force |
| CN209577316U (en) * | 2018-11-10 | 2019-11-05 | 山东科技大学 | A kind of centrifugal Multilayer vibrating screen |
| CN209849262U (en) * | 2019-03-23 | 2019-12-27 | 上海练定混凝土制品有限公司 | Small-size aggregate classified screening device that laboratory was used |
| CN111068867A (en) * | 2019-12-15 | 2020-04-28 | 徐州市鑫池建材有限公司 | Device for crushing and separating materials with multiple particle sizes |
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| CN101664737A (en) * | 2009-09-14 | 2010-03-10 | 广东绿洲肥业有限公司 | Multilevel screen type vibration screening device |
| JP2014208330A (en) * | 2013-03-29 | 2014-11-06 | 富士フイルム株式会社 | Centrifugal separation container, centrifugal separator, and centrifugal separation method using the same |
| CN105618277A (en) * | 2014-11-03 | 2016-06-01 | 陈忠庆 | Tilting type material distributing device of centrifugal machine |
| CN204710687U (en) * | 2015-06-23 | 2015-10-21 | 李贞贞 | A kind of screen centrifuge |
| CN206868577U (en) * | 2017-03-29 | 2018-01-12 | 汉源锦泰锌锗科技有限公司 | Zinc Oxide Multilayer screening plant |
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| CN109127409A (en) * | 2018-10-18 | 2019-01-04 | 徐州泰和硅材料有限公司 | A kind of quartz sand centrifugal separation device and method for separating |
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| CN111068867A (en) * | 2019-12-15 | 2020-04-28 | 徐州市鑫池建材有限公司 | Device for crushing and separating materials with multiple particle sizes |
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| CN111892318B (en) | 2022-08-23 |
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Application publication date: 20201106 Assignee: ZHEJIANG FANGYUAN BUILDING MATERIALS TECHNOLOGY Co.,Ltd. Assignor: TAIZHOU SIQIANG NEW BUILDING MATERIAL Co.,Ltd. Contract record no.: X2021330000306 Denomination of invention: Aggregate screening system for recycled concrete License type: Common License Record date: 20210929 |
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