CN109320119B

CN109320119B - High-quality recycled aggregate recovery device for building waste concrete

Info

Publication number: CN109320119B
Application number: CN201811314373.0A
Authority: CN
Inventors: 邵珠山; 袁媛; 吴奎; 魏玮
Original assignee: Xian University of Architecture and Technology
Current assignee: Xian University of Architecture and Technology
Priority date: 2018-11-06
Filing date: 2018-11-06
Publication date: 2023-06-09
Anticipated expiration: 2038-11-06
Also published as: CN109320119A

Abstract

The invention discloses high-quality recycled aggregate recycling equipment for waste concrete of a building, which comprises an equipment box body, wherein a storage cavity, a heating stirring cavity, a filtering separation cavity and a filtering pool are sequentially arranged in the equipment box body from top to bottom; a feed inlet is arranged at the top of the equipment box body, and the box body is communicated with a circulating water system; waste concrete entering a storage cavity of a box body of the equipment in batches is stirred, crushed and heated in a heating and stirring cavity by a stirring roller and microwave heating equipment at the same time, cooled by a circulating water system, separated into coarse aggregate and fine aggregate in a filtering and separating cavity by a two-stage vibrating screen, and collected from an outlet; and discharging fine powder after the screen residues are filtered in the filtering separation cavity. The invention can avoid the damage to the aggregate caused by extrusion grinding and crushing in the recovery of the waste concrete, greatly improves the production efficiency by a treatment mode of simultaneously carrying out microwave heating and mechanical stirring, has high efficiency and environmental protection in the production process, is simple and convenient to control, saves energy and cost, and is beneficial to popularization.

Description

High-quality recycled aggregate recovery device for building waste concrete

Technical Field

The invention belongs to the field of building materials, in particular to the field of recycling of waste concrete of buildings, and particularly relates to high-quality recycled aggregate recycling equipment for waste concrete of buildings.

Background

In recent years, the construction industry in China is rapidly rising, and a large amount of waste concrete is generated by demolishing old buildings while mass production of building material concrete is commonly used. On one hand, the production of new concrete consumes a large amount of natural resources such as sand and stone; on the other hand, the accumulation of the waste concrete causes environmental pollution and affects social order. The high-efficiency recycling of the waste concrete can solve the environmental pollution caused by the waste concrete, can be used as a raw material of new concrete for production, reduces the exploitation of natural sand and stone resources, and has great significance on development of recycling economy. At present, waste concrete is crushed by a method of mechanical extrusion and grinding, and the produced recycled aggregate has larger performance gap with natural aggregate due to self damage and more attached cement mortar, so that the application range is greatly limited. Therefore, the method realizes the effective separation of the aggregate and the mortar in the waste concrete, and the key technical problem of high-efficiency recycling of the waste concrete is realized without damaging the aggregate.

Disclosure of Invention

In order to solve the problems in the prior art, the invention aims to provide the high-quality recycled aggregate recycling equipment for the waste concrete, so as to realize the efficient recycling of the waste concrete.

The invention is realized by the following technical scheme.

The high-quality recycled aggregate recycling device for the waste concrete of the building comprises a device box body, wherein a storage cavity, a heating stirring cavity, a filtering separation cavity and a filtering pool are sequentially arranged in the device box body from top to bottom; the top of the equipment box body is provided with a feed inlet, the bottom of the equipment box body is provided with a damping support, and the equipment box body is communicated with a circulating water system;

waste concrete entering a storage cavity of a box body of the equipment in batches is stirred, crushed and heated in a heating and stirring cavity by a stirring roller and microwave heating equipment at the same time, cooled by a circulating water system, separated into coarse aggregate and fine aggregate in a filtering and separating cavity by a two-stage vibrating screen, and collected from an outlet; and discharging fine powder after the screen residues are filtered in the filtering separation cavity.

For the above technical solution, the present invention is further preferred:

preferably, the bottom of the material storage cavity and the bottom of the heating stirring cavity are provided with a semi-arc fixed partition plate fixed along the side wall of the equipment box body and a sliding partition plate below the semi-arc fixed partition plate, and an electric telescopic rod fixed on the equipment box body is connected below the sliding partition plate.

Preferably, the fixed partition plate of the storage cavity is correspondingly arranged below the feed inlet.

Preferably, the sliding partition board controls the electric telescopic rod to move in the arc chute in the equipment box body through the system to seal the storage cavity or the heating and stirring cavity.

Preferably, the electric telescopic rod is hinged with the equipment box body, and a PLC system is arranged in the electric telescopic rod, so that the opening and closing of the sliding partition plate can be automatically controlled.

Preferably, a plurality of microwave heaters and two stirring rollers are arranged in the heating and stirring cavity along the side wall of the equipment box body, and the driving shafts of the stirring rollers are connected through gear transmission by stirring motors arranged outside the box body; stirring rods are uniformly distributed on the surface of the stirring roller.

Preferably, a protective cover is arranged outside the microwave heater.

Preferably, the circulating water system comprises a water tank communicated with the tank body, wherein one end of the water tank is communicated with a water spraying port above the stirring roller through a water pipe, the top of the water tank is provided with a water inlet, and the other end of the water tank is communicated with a water filtering tank through a backflow water pipe and a water pump.

Preferably, in the filtration separation chamber, including two-stage vibration screen cloth that two-layer is slope distribution, the sieve mesh aperture of one-level vibration screen cloth is greater than the sieve mesh aperture of second grade vibration screen cloth, all is equipped with the vibrator below the two-stage vibration screen cloth, is equipped with coarse aggregate discharge gate on the low-end box lateral wall of the one-level vibration screen cloth of two-stage vibration screen cloth, is equipped with the fine aggregate discharge gate on the low-end box lateral wall of second grade vibration screen cloth.

Preferably, a water filtering plate which is obliquely distributed is arranged below the secondary vibrating screen, a impurity outlet is formed in the side wall of the low-end box body of the water filtering plate, a vent is formed in the upper portion of the side wall of the high-end box body of the water filtering plate, and the vent is connected with a blower.

Compared with the prior art, the technical scheme provided by the application has the following advantages:

1. the invention is designed with a storage cavity. The abandoned concrete that drops temporarily stores in the storage chamber, can avoid carrying out the concrete that the heating stirred at present and produce the influence, and the baffle of storage chamber bottom sets up to the arc, prevents to last the material in-process of throwing, card material when sliding partition closes.

2. The invention designs a stirring roller and a microwave heater. The microwave absorption performance of the aggregate and the mortar in the waste concrete is greatly different, the interface strength is greatly weakened due to the fact that the interface between the aggregate and the mortar is heated by a microwave heater and huge thermal stress is generated due to the difference of thermal expansion, the stirring rod on the surface of the waste concrete is driven to rotate by the stirring roller to stir the waste concrete with weakened strength, and the adhesive mortar on the surface of the aggregate can be effectively dropped; the microwave absorption performance of the aggregate is weaker, so that the aggregate cannot be damaged, and the microwave heating and the mechanical stirring are performed simultaneously, so that the treatment efficiency can be greatly improved.

3. The invention designs a cooling water circulation system. The heated and stirred materials are soaked in water and cooled to form a larger temperature gradient instantly, so that the separation of aggregate and mortar is further promoted, and meanwhile, the stirring roller and the stirring rod are washed and cooled, and the service life is prolonged.

4. The invention is designed with a sliding partition. After the waste concrete is heated, stirred, soaked and cooled, a sliding partition plate at the bottom of the heating and stirring cavity is opened, so that the waste concrete falls onto an inclined vibrating screen to be classified and screened, and high-quality recycled coarse aggregate and fine aggregate can be obtained respectively.

5. The invention is designed with a water filtering plate. In order to prevent impurities such as fine powder from blocking the water filtering plate, a vent is arranged above the water filtering plate, and the fine powder is ventilated and dried by the air supplied by a blower, so that the fine powder is conveniently discharged from the impurity outlet.

6. The invention is designed with a water filtering pool. The water in the water filtering tank flows back to the water tank through the water pump in a pressurizing way by the return pipe, so that the cyclic utilization of water resources is realized, the water pollution is avoided, the production process is efficient and environment-friendly, the control is simple and convenient, the energy and the cost are saved, and the popularization is facilitated.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate and do not limit the invention, and together with the description serve to explain the principle of the invention:

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of a heating and stirring cavity structure of the invention;

in the figure: 1. a feed inlet; 2. an equipment box; 3. a storage cavity; 4. fixing the partition board; 5. a first sliding partition; 6. a first electric telescopic rod; 7. heating the stirring cavity; 8. a microwave heater; 9. stirring roller; 10. a stirring rod; 11. a drive shaft; 12. a stirring motor; 13. a water jet; 14. a water tank; 15. a water inlet; 16. a second sliding partition; 17. a second electric telescopic rod; 18. a primary vibrating screen; 19. a secondary vibrating screen; 20. a vibrator; 21. a coarse aggregate discharge port; 22. fine aggregate discharge port; 23. a water filtering plate; 24. a impurity outlet; 25. a vent; 26. a blower; 27. a water filtering pool; 28. a return water pipe; 29. a water pump; 30. a damping support; 31. and a sliding groove.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples, which are not intended to be limiting.

In a specific embodiment 1, as shown in fig. 1 and 2, a high-quality recycled aggregate recycling device for waste concrete of a building comprises a device box body 2, wherein a storage cavity 3, a heating and stirring cavity 7 and a filtering and separating cavity are sequentially arranged in the device box body 2 from top to bottom, a feed inlet 1 is arranged at the top of the device box body 2, a damping support 30 is arranged at the bottom of the device box body, and a circulating water system is communicated with the device box body.

Wherein, the lower part of the material storage cavity 3 corresponding to the material inlet 1 is provided with a semi-arc fixed baffle 4 fixed along the side wall of the equipment box body 2 and a first sliding baffle 5 below the semi-arc fixed baffle, an arc chute 31 is arranged between the inner side walls of the equipment box body 2, and the radian is 1/9 pi-1/6 pi. The first sliding partition plate 5 can slide in the arc chute 31; the bottom of the first sliding partition plate 5 is provided with a first electric telescopic rod 6, so that the first sliding partition plate 5 can be prevented from being blocked when being butted and sealed with the fixed partition plate 4 along the arc chute 31 in the continuous feeding process. The sliding of the first sliding partition plate 5 is controlled by a first electric telescopic rod 6, the first electric telescopic rod 6 is hinged with the equipment box body 2, a PLC system is built in, and the opening and closing of the sliding partition plate 5 can be automatically controlled.

In the heating stirring cavity 7, a plurality of microwave heaters 8 and two stirring rollers 9 are arranged on the side wall of the equipment box body 2, a protective cover is arranged outside the microwave heaters 8, the two stirring rollers 9 are erected on the side wall of the box body, and a driving shaft 11 of the stirring rollers 9 is connected through a gear transmission through a stirring motor 12 arranged outside the box body; stirring rods 10 are uniformly distributed on the surface of the stirring roller 9; the stirring roller drives the stirring rod on the surface to rotate when rotating, the concrete with the interface strength weakened sharply is stirred, the attached mortar on the surface of the aggregate is accelerated to fall off, and the stirring rods 10 on the surfaces of the two stirring rollers 9 are separated by a certain distance, so that the extrusion damage to the aggregate is avoided. The microwave heating and the mechanical stirring are simultaneously carried out, so that the treatment efficiency is greatly improved, and the interface strength of the aggregate and the adhesive mortar in the waste concrete subjected to the microwave heating is greatly weakened.

The circulating water system communicated with the tank body comprises a water tank 14 communicated with the tank body, wherein the water tank 14 is communicated with a water spraying port 13 above the stirring roller 9 through one end of a water pipe, a control valve is arranged on the water pipe, a water inlet 15 is arranged at the top of the water tank 14, and the other end of the water tank 14 is communicated with the side wall of the bottom of the tank body through a backflow water pipe 28 and a water pump 29.

After the waste concrete is heated and stirred in the heating and stirring cavity 7 for a certain time, the control valve is opened to enable the water spraying port 13 to spray water, on one hand, the materials in the heating and stirring cavity 7 are cooled, on the other hand, a large temperature gradient is formed instantly, so that the separation of aggregate and mortar is further promoted, and on the other hand, the stirring roller 9 and the stirring rod 10 are washed and cooled, and the service life is prolonged.

The bottom of the heating stirring cavity 7 is provided with a semi-arc-shaped fixed partition board 4 fixed along the side wall of the equipment box body 2 and a second sliding partition board 16 below the semi-arc-shaped fixed partition board, an arc-shaped chute 31 is arranged between the inner side walls of the equipment box body 2, and the radian is 1/9 pi-1/6 pi. The bottom of the second sliding partition plate 16 is provided with a second electric telescopic rod 17, the sliding of the second sliding partition plate 16 is controlled by the second electric telescopic rod 17, the second electric telescopic rod 17 is hinged with the equipment box body 2, and a PLC system is built in the second electric telescopic rod, so that the opening and closing of the sliding partition plate 16 can be automatically controlled.

The filter separation cavity comprises two layers of primary vibrating screens 18 and secondary vibrating screens 19 which are obliquely distributed, wherein the mesh aperture of the primary vibrating screens 18 is larger than that of the secondary vibrating screens 19; the vibrators 20 are arranged below the two-stage vibrating screen meshes, coarse aggregate discharge holes 21 are formed in the side walls of the low-end boxes of the primary vibrating screen meshes 18, and fine aggregate discharge holes 22 are formed in the side walls of the low-end boxes of the secondary vibrating screen meshes 19. After the waste concrete material is heated, stirred, immersed and cooled, the second sliding partition plate 16 is opened, the material falls onto the primary vibrating screen 18 and the secondary vibrating screen 19, and high-quality recycled aggregate is recovered through the coarse aggregate discharge port 21 and the fine aggregate discharge port 22 respectively. The water filtering plate 23 with the same inclination is arranged below the secondary vibrating screen 19, the impurity outlet 24 is arranged on the side wall of the low-end box body of the water filtering plate 23, the ventilation opening 25 is arranged above the side wall of the high-end box body of the water filtering plate 23, the ventilation opening 25 is connected with the blower 26, impurities such as fine powder on the water filtering plate 23 are ventilated and dried, and the impurities are conveniently discharged from the impurity outlet 24, so that the blockage of the water filtering plate 23 is prevented. The box below the water filtering plate 23 is a water filtering pool 27, the water filtering pool 27 is communicated with a backflow water pipe 28, and water in the water filtering pool 27 flows back to the water tank 14 under pressure through a water pump 29, so that the recycling of water resources is realized, and the water pollution is avoided.

The working principle of the invention is as follows: after the large waste concrete blocks enter the heating and stirring cavity through the material storage cavity, the sliding partition plate at the bottom of the material storage cavity is closed, and then the waste concrete materials can still be continuously put into the material storage cavity through the material inlet; the materials entering the heating and stirring cavity are heated by a microwave heater, so that the interface strength of aggregate and adhesive mortar in the concrete is weakened sharply; the stirring roller drives the stirring rod to rotate to stir the materials with weakened strength, so that the separation of the aggregate and the attached mortar is accelerated without damaging the aggregate, and the microwave heating and the mechanical stirring are simultaneously carried out; after a certain time, cooling water is injected from the water injection port, and a large temperature gradient is formed instantaneously after the heated material is immersed in water and cooled, so that the separation of aggregate and mortar is further promoted; and meanwhile, the stirring roller and the stirring rod are washed and cooled, so that the service life is prolonged. After the waste concrete is heated, stirred, soaked and cooled, a sliding partition plate at the bottom of the heating and stirring cavity is opened, so that the waste concrete falls onto an inclined vibrating screen to be classified and screened, and high-quality recycled coarse aggregate and fine aggregate can be obtained respectively. In order to prevent impurities such as fine powder from blocking the water filtering plate, a vent is arranged above the water filtering plate, and the fine powder is ventilated and dried by the air supplied by a blower, so that the fine powder is conveniently discharged from the impurity outlet. A water filtering tank is arranged below the water filtering plate, water in the water filtering tank flows back to the water tank through the water pump in a pressurized mode by the backflow pipe, cyclic utilization of water resources is achieved, and water pollution is avoided. The system has the advantages of high production efficiency, environmental protection, simple and convenient control and energy and cost saving.

The invention is not limited to the above embodiments, and based on the technical solution disclosed in the invention, a person skilled in the art may make some substitutions and modifications to some technical features thereof without creative effort according to the technical content disclosed, and all the substitutions and modifications are within the protection scope of the invention.

Claims

1. The utility model provides a high-quality recycled aggregate recovery plant of building discarded concrete which characterized in that: the device comprises a device box body (2), wherein a storage cavity (3), a heating and stirring cavity (7), a filtering and separating cavity and a filtering water tank (27) are sequentially arranged in the device box body (2) from top to bottom; a feed inlet (1) is arranged at the top of the equipment box body (2), a damping support (30) is arranged at the bottom of the equipment box body (2), and a circulating water system is communicated with the equipment box body (2);

the bottoms of the storage cavity (3) and the heating stirring cavity (7) are provided with a semi-arc fixed partition plate (4) fixed along the side wall of the equipment box body (2) and a sliding partition plate below the semi-arc fixed partition plate, and an electric telescopic rod fixed on the equipment box body (2) is connected below the sliding partition plate;

a plurality of microwave heaters (8) and two stirring rollers (9) which are arranged along the side wall of the equipment box body (2) are arranged in the heating stirring cavity (7), and a driving shaft (11) of the stirring rollers (9) is connected through a stirring motor (12) arranged outside the box body in a gear transmission manner; stirring rods (10) are uniformly distributed on the surface of the stirring roller (9);

waste concrete entering the equipment box storage cavity (3) in batches is stirred, crushed and heated in the heating and stirring cavity (7) by the stirring roller (9) and the microwave heating equipment at the same time, and after being cooled by the circulating water system, the waste concrete falls on the inclined vibrating screen to carry out classification screening, coarse aggregate and fine aggregate are separated in the filtering and separating cavity by the two-stage vibrating screen and are collected from the outlet; and discharging fine powder after the screen residues are filtered in the filtering separation cavity.

2. The apparatus for recycling high-quality recycled aggregate of waste concrete for buildings according to claim 1, wherein: the fixed partition plate (4) of the storage cavity (3) is correspondingly arranged below the feed inlet (1).

3. The apparatus for recycling high-quality recycled aggregate of waste concrete for buildings according to claim 1, wherein: the sliding partition board controls the electric telescopic rod to move in the arc chute (31) in the equipment box body (2) through the system to seal the storage cavity (3) or the heating stirring cavity (7).

4. The apparatus for recycling high-quality recycled aggregate of waste concrete for buildings according to claim 1, wherein: the electric telescopic rod is hinged with the equipment box body (2), a PLC system is arranged in the electric telescopic rod, and the opening and closing of the sliding partition plate can be automatically controlled.

5. The apparatus for recycling high-quality recycled aggregate of waste concrete for buildings according to claim 1, wherein: the outside of the microwave heater (8) is provided with a protective cover.

6. The apparatus for recycling high-quality recycled aggregate of waste concrete for buildings according to claim 1, wherein: the circulating water system comprises a water tank (14) which is communicated with the tank body, the water tank (14) is communicated with a water spraying port (13) above the stirring roller (9) through one end of a water pipe, a water inlet (15) is formed in the top of the water tank (14), and the other end of the water tank (14) is communicated with a water filtering tank (27) through a backflow water pipe (28) and a water pump (29).

7. The apparatus for recycling high-quality recycled aggregate of waste concrete for buildings according to claim 1, wherein: the filtering separation cavity comprises two layers of two-stage vibrating screens which are obliquely distributed, and the pore diameter of a first-stage vibrating screen (18) is larger than that of a second-stage vibrating screen (19); vibrator (20) are arranged below two-stage vibrating screen meshes, coarse aggregate discharge holes (21) are formed in the side wall of the low-end box body of one-stage vibrating screen mesh (18) of the two-stage vibrating screen meshes, and fine aggregate discharge holes (22) are formed in the side wall of the low-end box body of the two-stage vibrating screen mesh (19).

8. The apparatus for recycling high-quality recycled aggregate of waste concrete for buildings according to claim 7, wherein: a water filtering plate (23) which is obliquely distributed is arranged below the secondary vibrating screen (19), a impurity outlet (24) is formed in the side wall of the low-end box body of the water filtering plate (23), a ventilation opening (25) is formed in the upper portion of the side wall of the high-end box body of the water filtering plate (23), and the ventilation opening (25) is connected with a blower (26).