CN115383909A - Soil-based concrete preparation device and preparation method - Google Patents
Soil-based concrete preparation device and preparation method Download PDFInfo
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- CN115383909A CN115383909A CN202210966387.0A CN202210966387A CN115383909A CN 115383909 A CN115383909 A CN 115383909A CN 202210966387 A CN202210966387 A CN 202210966387A CN 115383909 A CN115383909 A CN 115383909A
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- 239000002689 soil Substances 0.000 title claims abstract description 117
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000002699 waste material Substances 0.000 claims abstract description 84
- 238000003756 stirring Methods 0.000 claims abstract description 59
- 238000000227 grinding Methods 0.000 claims abstract description 49
- 239000000843 powder Substances 0.000 claims abstract description 40
- 238000012216 screening Methods 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000012535 impurity Substances 0.000 claims abstract description 18
- 238000011068 loading method Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 239000010881 fly ash Substances 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 4
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 13
- 229910052799 carbon Inorganic materials 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 238000007599 discharging Methods 0.000 description 7
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000009430 construction management Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C9/00—General arrangement or layout of plant
- B28C9/02—General arrangement or layout of plant for producing mixtures of clay or cement with other materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
- B02C4/08—Crushing or disintegrating by roller mills with two or more rollers with co-operating corrugated or toothed crushing-rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
- B28C5/006—Methods for mixing involving mechanical aspects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/10—Mixing in containers not actuated to effect the mixing
- B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
- B28C5/16—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a vertical or steeply inclined axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/0007—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/06—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Dispersion Chemistry (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Food Science & Technology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a soil-based concrete preparation device and a preparation method thereof, wherein the soil-based concrete preparation device comprises a screening unit, a grinding unit and a stirring unit which are sequentially connected, wherein the screening unit is used for removing hard impurities in waste soil; the grinding unit is used for grinding the discarded soil after impurity removal to obtain discarded soil powder; the stirring unit is used for mixing and stirring the waste soil powder, the cementing material powder and the gravel bone; wherein, the screening unit includes the casing and rotates and locates material loading subassembly in the casing, it is the slope discharge gate that upwards sets up that the feed inlet that the slope set up downwards and at least part to have at least part on the casing, the feed inlet with the discharge gate all is located on material loading subassembly's the direction of rotation, just be equipped with the filter screen on the discharge gate, it is a plurality of material loading subassembly be the circumference array set up in the casing, in order to follow the spoil the feed inlet is carried extremely discharge gate department. The invention solves the technical problems of screen leakage and screen dislocation in the prior art.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a soil-based concrete preparation device and a preparation method.
Background
With the increasing speed of urbanization construction in China, various engineering constructions such as highways, large bridges, super high-rise buildings, high-rise buildings and the like enter a fast-developing peak period. However, during construction, due to the insufficiency of the construction process or carelessness of construction management, a large amount of waste engineering spoil is generated, and the improper treatment of the engineering spoil causes environmental pollution and waste of resources. The resource utilization of the engineering waste soil becomes an important problem for domestic and foreign engineering construction, urban environmental protection and resource circulation. At present, the main resource utilization approach of the engineering waste soil is to transport the engineering waste soil to other places for disposal and utilization, such as bricks, cement raw materials, ceramsite and the like, which need higher transportation cost, and the problems of leakage, environmental pollution, energy consumption, traffic accidents and the like exist in the process of transporting the engineering waste soil outside. Therefore, if the engineering waste soil is self-consumed in the field, the reduction of the construction waste can be realized, and the carbon emission in the construction process is reduced.
In conclusion, a method for resource utilization in an engineering spoil area is urgently needed to reduce building garbage, reduce cost, reduce carbon emission and realize green construction. Therefore, the Chinese patent with the publication number of CN113600473B provides a device for preparing concrete by using construction waste and a preparation method thereof, wherein a shaking driving assembly is used for driving a sieve plate to reciprocate and tilt so as to achieve the purpose of reciprocating automatic feeding and screening of the construction waste aggregates. However, the aim of re-screening once can be achieved, so that the conditions of screen leakage and screen error still exist; and is also not suitable for large-batch screening operation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a soil-based concrete preparation device and a preparation method, which solve the technical problems of screen leakage and screen misplacement in the prior art.
According to an embodiment of the present invention, a soil-based concrete preparation apparatus includes a sieving unit, a grinding unit, and a stirring unit connected in sequence,
the screening unit is used for removing hard impurities in the waste soil;
the grinding unit is used for grinding the discarded soil after impurity removal to obtain discarded soil powder;
the stirring unit is used for mixing and stirring the waste soil powder, the cementing material powder and the gravel bone;
wherein, the screening unit includes the casing and rotates and locates material loading subassembly in the casing, it is the slope discharge gate that upwards sets up that the feed inlet that the slope set up downwards and at least part to have at least part on the casing, the feed inlet with the discharge gate all is located on material loading subassembly's the direction of rotation, just be equipped with the filter screen on the discharge gate, it is a plurality of material loading subassembly be the circumference array set up in the casing, in order to follow the spoil the feed inlet is carried extremely discharge gate department.
Preferably, the feeding assembly comprises a connecting rod rotatably arranged in the shell and a hopper for conveying spoil, the hopper is fixedly connected with the connecting rod, and an opening of the hopper faces to the rotating direction of the connecting rod.
Preferably, the opening of the hopper is provided with a guide block which is obliquely arranged, and the guide block and the hopper are integrally formed.
Preferably, the shell is rotatably provided with a first baffle, and when the first baffle is rotated to cover the shell, the first baffle at least partially closes the feed port.
Preferably, the casing is provided with a hook, the first baffle is provided with a hanging ring matched with the hook, and when the first baffle and the casing are uncovered, the first baffle rotates towards the discharge hole so that the hanging ring is in limit fit with the hook.
Preferably, the housing is provided with a second baffle plate which is obliquely arranged, the lower end of the second baffle plate is fixedly connected with the housing, and the high end of the second baffle plate extends towards the grinding unit.
Preferably, a plurality of grooves are formed in the second baffle plate, a plurality of supporting strips matched with the grooves are rotatably arranged on the shell, and the supporting strips are abutted to the second baffle plate through the grooves.
Preferably, the sieving unit and the grinding unit and the stirring unit are connected through a conveyor belt.
Preferably, the grinding unit comprises a box body and a grinding roller rotatably arranged in the box body;
the stirring unit comprises a tank body and stirring blades arranged in the tank body in a rotating mode, and a plurality of stirring areas which are of triangular structures are arranged on the stirring blades.
On the other hand, according to the embodiment of the invention, the preparation method of the soil-based concrete is also provided, and comprises the following steps:
s1, putting the dried and crushed waste soil serving as a waste soil raw material into a screening unit and separating hard impurities in the waste soil;
s2, conveying the waste soil raw material subjected to impurity removal into a grinding unit for grinding, and grinding the waste soil raw material into waste soil powder with the particle size of less than 40 mu m;
s3, adding the waste soil powder, the cementing material and the sandstone aggregate in the step S2 into a stirring unit, and stirring and mixing to obtain a dry-mixed mixture;
s4, adding an additive and water into the stirring unit, and stirring the mixture and the dry-mixed mixture obtained in the step S3 to obtain soil-based concrete;
wherein the drying temperature of the waste soil is 105 ℃, and the drying time is 24h;
the cementing material is one or more of cement, fly ash and slag;
the waste soil powder in the dry-mixed mixture in the step S3 accounts for 20-80% of the cementing material of the dry-mixed mixture, and the sand rate is 0.4-0.8;
the additive is one or more of polycarboxylic acid water reducing agent, sodium silicate and sodium hydroxide.
Compared with the prior art, the invention has the following beneficial effects: the waste soil can be subjected to screening, grinding and stirring treatment one by one through the screening unit, the grinding unit and the stirring unit which are sequentially arranged, and the waste soil is subjected to resource treatment, so that the consumption of raw materials is reduced, the carbon emission is reduced while the cost is reduced, the resource utilization range of the engineering waste soil is widened, and the green construction is realized; moreover, the operation and control are convenient, the continuous production can be realized, the production efficiency is high, the production cost is low, the product can be directly used on site, and the in-site self-absorption of the engineering waste soil is realized; moreover, at least part of the obliquely downward feeding holes and at least part of the obliquely upward discharging holes can facilitate the rotating feeding assembly to rapidly convey the waste soil to the discharging holes through the feeding holes, the waste soil at the discharging holes can directly enter the grinding unit through the filter screen under the action of centrifugal force, the waste soil blocked below the filter screen (namely in the shell) is conveyed in a reciprocating mode through the rotating feeding assembly again until all screening operation of hard sundries in the waste soil is completed, in the process, the rotating feeding assembly can continuously convey the waste soil to the filter screen in a reciprocating mode to be screened, accordingly, the situation of screen miss or screen missing can be avoided, manual transfer of unscreened waste soil is not needed in the re-screening process, and continuous automatic preparation is achieved.
Drawings
FIG. 1 is a schematic structural diagram of a manufacturing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a screening unit according to an embodiment of the present invention;
fig. 3 is a schematic view of the structure at another angle in fig. 2.
In the figure:
1. a screening unit; 11. a housing; 111. a feed inlet; 112. a discharge port; 113. a filter screen; 12. a feeding assembly; 121. a connecting rod; 122. a hopper; 123. a guide block; 2. a grinding unit; 21. a box body; 22. a grinding roller; 3. a stirring unit; 31. a tank body; 32. a stirring blade; 33. a stirring zone; 4. a first baffle; 5. hooking; 6. hanging a ring; 7. a second baffle; 8. a groove; 9. a supporting strip; 10. and (4) a conveyor belt.
Detailed Description
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention will be further described with reference to the accompanying figures 1-3.
A soil-based concrete preparation device comprises a screening unit 1, a grinding unit 2 and a stirring unit 3 which are connected in sequence,
the screening unit 1 is used for removing hard impurities in the waste soil;
the grinding unit 2 is used for grinding the discarded soil after impurity removal to obtain discarded soil powder;
the stirring unit 3 is used for mixing and stirring the waste soil powder, the cementing material powder and the gravel bone;
wherein, screening unit 1 includes casing 11 and rotates and locates material loading subassembly 12 in the casing 11, casing 11 is last to have at least part to be the slope feed inlet 111 that sets up downwards and at least part to be the slope discharge gate 112 that sets up upwards, feed inlet 111 with discharge gate 112 all is located on the rotation direction of material loading subassembly 12, just be equipped with filter screen 113 on the discharge gate 112, a plurality of material loading subassembly 12 is the circumference array set up in the casing 11, so as to follow the spoil feed inlet 111 carry to discharge gate 112 department.
In this embodiment, as shown in fig. 1, in order to sequentially screen, grind and stir the dried and crushed waste soil, the screening unit 1, the grinding unit 2 and the stirring unit 3 are sequentially connected, so that the screening unit 1 can separate the waste soil and hard impurities therein, the screened waste soil is ground into waste soil powder by the grinding unit 2, and finally, a certain amount of waste soil powder, cementitious material powder and sand and stone bones are added into the stirring unit 3 to be mixed and stirred to obtain soil-based concrete, so that the participation of personnel can be reduced in the process, and automatic operation is realized to automatically absorb the waste soil in the engineering waste soil yard; on the other hand, to avoid the occurrence of screen missing and screen misplacing, as shown in fig. 2 and fig. 3, the screening unit 1 includes a housing 11 and a feeding assembly 12 rotatably disposed therein, the housing 11 is in a regular octagonal structure, and a feeding port 111 and a discharging port 112 thereof are respectively disposed at the left and right sides of the housing 11; in order to facilitate quick feeding and reduce the risk of falling of the spoil in the process, the upper part of the feeding port 111 is vertically arranged, the lower part of the feeding port is obliquely and downwards arranged, the upper part of the feeding port 111 is used for yielding the feeding assembly 12, and the whole area of the feeding port 111 can be increased; the lower part of the feed port 111 is used for transferring the spoil to the discharge port 112 when the feeding assembly 12 passes through the feed port; the upper part of the discharge port 112 is arranged obliquely upwards, the lower part of the discharge port 112 is arranged vertically, the spoil can rotate along with the feeding assembly 12 under the driving of the rotating feeding assembly, and when the spoil rotates to the discharge port 112, the spoil flies to the discharge port 112 under the influence of centrifugal force and enters the grinding unit 2 after being screened by the filter screen 113 on the discharge port; the discharge port 112 is divided into an upper part and a lower part, the upper part can not only screen the waste soil, but also can block the separated hard sundries or the waste soil which is not completely separated in the shell 11, and finally the waste soil is thrown to the filter screen 113 to be screened in a reciprocating way through the continuously rotating feeding assembly 12, and the condition of screen leakage can be avoided through the continuous and reciprocating screening; the part of the discharge hole 112 which is arranged obliquely upwards can block hard impurities in the shell 11 so as to avoid the condition of wrong screening.
The feeding assembly 12 comprises a connecting rod 121 rotatably arranged in the housing 11 and a hopper 122 for conveying spoil, wherein the hopper 122 is fixedly connected with the connecting rod 121, and an opening of the hopper is towards the rotating direction of the connecting rod 121.
In this embodiment, as shown in fig. 3, in order to quickly transfer the waste soil at the feeding port 111 to the discharging port 112, each feeding assembly 12 includes a connecting rod 121 and a hopper 122, the connecting rod 121 is connected to a motor on the housing 11 through a rotating shaft arranged in the housing 11, the hopper 122 is mounted on the connecting rod 121, the motor drives the connecting rod 121 to rotate through the rotating shaft, so that the hopper 122 rotates therewith, and the waste soil at the feeding port 111 can be quickly shoveled into the hopper 122 and then thrown to the filter screen 113 on the discharging port 112 under the action of centrifugal force in the rotating process of the hopper 122; meanwhile, the opening of the hopper 122 faces the rotation direction of the connecting rod 121, so that the spoil of the hopper 122 at the feeding port 111 can rapidly enter the hopper 122 through the opening during the rotation process and be transferred to the discharging port 112 through the opening.
The opening of the hopper 122 is provided with a guide block 123 which is obliquely arranged, and the guide block 123 and the hopper 122 are integrally formed.
In this embodiment, in order to quickly scoop the spoil of the feeding port 111 into the hopper 122, as shown in fig. 3, a guide block 123 is disposed at an opening of the hopper 122, the guide block 123 is disposed in an inclined manner, and the guide block 123 can facilitate quick transition of the spoil into the hopper 122.
The shell 11 is provided with a first baffle 4 in a rotating mode, and when the first baffle 4 rotates to cover the shell 11, the first baffle 4 at least partially seals the feeding hole 111.
In this embodiment, when the feeding assembly 12 is used for feeding, in order to reduce dust emission, as shown in fig. 2 and 3, the shell 11 is connected to the first baffle 4 through a hinge, the first baffle 4 is used for opening or closing the upper portion of the feeding hole 111, and the feeding hole 111 in an open state can facilitate checking the inside condition of the shell 11 and facilitating maintenance; the feed inlet 111 in a closed state can lock dust in the housing 11 under the action of the first baffle 4, and the first baffle 4 can guide the spoil or hard impurities which are not screened by the filter screen 113 to fall to the lower part of the feed inlet 111 again, so that the spoil or hard impurities can be fed and screened again.
Be equipped with couple 5 on the casing 11, be equipped with on first baffle 4 with link 6 of couple 5 looks adaptation, when first baffle 4 with when casing 11 is relieved to cover, first baffle 4 to discharge gate 112 direction rotates, so that link 6 with couple 5 spacing cooperation.
In this embodiment, during the maintenance, in order to fix first baffle 4 on casing 11, as shown in fig. 2, be equipped with couple 5 on casing 11, be equipped with on first baffle 4 with couple 5 looks adaptation link 6, so, behind couple 5 and the 6 spacing cooperation of link, can lock first baffle 4 on casing 11.
The shell 11 is provided with a second baffle 7 which is obliquely arranged, the lower end of the second baffle 7 is fixedly connected with the shell 11, and the high end of the second baffle 7 extends towards the grinding unit 2.
In this embodiment, as shown in fig. 2 and 3, in order to avoid splashing of the screened waste soil, the housing 11 is provided with the second baffle 7 which is obliquely arranged, the lower end of the second baffle 7 is fixedly connected with the housing 11, and the high end of the second baffle extends towards the grinding unit 2, so that the screened waste soil can be guided to rapidly enter the grinding unit 2.
The second baffle 7 is provided with a plurality of grooves 8, the shell 11 is rotatably provided with a plurality of supporting bars 9 matched with the grooves 8, and the supporting bars 9 are abutted to the second baffle 7 through the grooves 8.
In this embodiment, in order to balance the stress of the second baffle 7, as shown in fig. 2, a groove 8 is provided on the second baffle 7 (in this embodiment, two grooves 8 arranged at intervals are taken as an example), a supporting bar 9 adapted to the groove 8 is provided on the groove 8, one end of the supporting bar 9 abuts against the second baffle 7 through the groove 8, and the other end of the supporting bar 9 is rotatably provided on the housing 11; the supporting bar 9 is pressed tightly in the groove 8 after being rotated to a proper position, so that a stable triangular structure is formed among the supporting bar 9, the second baffle 7 and the shell 11.
The screening unit 1 and the grinding unit 2 and the stirring unit 3 are connected through a conveying belt 10.
In this embodiment, as shown in fig. 1, in order to realize continuous automatic operation, the sieving unit 1 and the grinding unit 2, and the grinding unit 2 and the stirring unit 3 are connected by a conveyor belt 10.
The grinding unit 2 comprises a box body 21 and a grinding roller 22 rotatably arranged in the box body 21;
the stirring unit 3 comprises a tank 31 and a stirring blade 32 rotatably arranged in the tank 31, wherein the stirring blade 32 is provided with a plurality of stirring areas 33 in a triangular structure.
In this embodiment, the rotating grinding roller 22 can grind the waste soil conveyed into the box 21 by the conveyor belt 10 to prepare waste soil powder, the waste soil powder is conveyed into the tank 31 by the conveyor belt 10 through the outlet of the box 21, and is mixed and stirred with the cementitious material powder and the gravel aggregate by the stirring blade 32, and the mixture is fully stirred to obtain the soil-based concrete; on the other hand, for the purpose of achieving sufficient stirring, as shown in fig. 1, each stirring blade 32 is provided with a stirring area 33, the stirring area 33 is in a triangular structure, and the stirring area 33 may be a through hole in the triangular structure formed on the stirring blade 32.
The embodiment also provides a preparation method of the soil-based concrete, which comprises the following steps:
s1, putting the dried and crushed waste soil serving as a waste soil raw material into a screening unit 1 and separating hard impurities in the waste soil;
s2, conveying the waste soil raw material subjected to impurity removal into a grinding unit 2 for grinding, and grinding the waste soil raw material into waste soil powder with the particle size smaller than 40 mu m;
s3, adding the waste soil powder, the cementing material and the sandstone aggregate in the step S2 into a stirring unit 3, and stirring and mixing to obtain a dry-mixed mixture;
s4, adding an additive and water into the stirring unit 3, and stirring the mixture and the dry-mixed mixture obtained in the step S3 to obtain soil-based concrete;
wherein the drying temperature of the waste soil is 105 ℃, and the drying time is 24h;
the cementing material is one or more of cement, fly ash and slag;
the waste soil powder in the dry-mixed mixture in the step S3 accounts for 20-80% of the cementing material of the dry-mixed mixture, and the sand rate is 0.4-0.8;
the additive is one or more of polycarboxylic acid water reducing agent, sodium silicate and sodium hydroxide.
Example 1
50kg of engineering waste soil is put into a drying oven at 105 ℃ for drying for more than 24 hours until the weight is constant, and then the engineering waste soil is taken out for crushing to remove hard large particles. Grinding 9.5Kg of waste soil into powder of waste soil with a particle size of less than 40 μm, adding 26Kg of cement powder and 11.8Kg of fly ash powder which have been ground into powder with a particle size of less than 40 μm, and adding 135.3Kg of sand and 90.3Kg of pebble, and mixing to obtain a dry-mixed mixture. And then adding 2.4Kg of polycarboxylic acid water reducing agent and 28.3Kg of tap water into the mixture, and uniformly stirring to obtain the soil-based concrete with high fluidity.
The obtained soil-based concrete had a slump of 210mm, an expansion of 420mm, an unconfined compressive strength of 24.5MPa and a cubic compressive strength of 20.5MPa, and a carbon emission reduced by about 50Kg CO2/m3 as compared with that of comparative example 1.
Example 2
50kg of engineering waste soil is put into a drying oven at 105 ℃ for drying for more than 24 hours until the weight is constant, and then the engineering waste soil is taken out for crushing to remove hard large particles. Grinding 15.6Kg of spoil into powder of spoil having a particle size of less than 40 μm, then adding 19.9Kg of cement powder and 11.8Kg of fly ash which have been ground into powder having a particle size of less than 40 μm, and adding 135.3Kg of sand and 90.3Kg of pebble to mix them to obtain a dry-mix mixture. And then adding 2.4Kg of polycarboxylic acid water reducing agent and 28.3Kg of tap water into the mixture, and uniformly stirring to obtain the soil-based concrete with high fluidity.
The obtained soil-based concrete has the slump of 220mm, the expansion of 440mm, the unconfined compressive strength of 28d of 18.1MPa and the cubic compressive strength of 13.5MPa, and the carbon emission is reduced by about 80Kg CO2/m < 3 > compared with the carbon emission of the comparative example 1.
Example 3
50kg of engineering waste soil is put into a drying oven at 105 ℃ for drying for more than 24 hours until the weight is constant, and then the engineering waste soil is taken out for crushing to remove hard large particles. 21.6Kg of waste soil was ground into powder of waste soil having a particle size of less than 40 μm, and then 13.9Kg of cement powder and 11.8Kg of fly ash powder, which had been ground into powder having a particle size of less than 40 μm, were added, and 135.3Kg of sand and 90.3Kg of pebbles were added and mixed to obtain a dry-mix mixture. And then adding 2.4Kg of polycarboxylic acid water reducing agent and 28.3Kg of tap water into the mixture, and uniformly stirring to obtain the soil-based concrete with high fluidity.
The obtained soil-based concrete has the slump of 250mm, the expansion of 460mm, the unconfined compressive strength of 28d of 11.1MPa and the cubic compressive strength of 8.1MPa, and the carbon emission is reduced by about 110Kg CO2/m < 3 > compared with the carbon emission of the comparative example 1.
The preparation process of the traditional process is as follows:
to 35.5Kg of cement powder and 11.8Kg of fly ash powder, which have been ground to a particle size of less than 40 μm, were added 135.3Kg of sand and 90.3Kg of pebble, and they were mixed to obtain a dry-mix mixture. And then adding 2.4Kg of polycarboxylic acid water reducing agent and 28.3Kg of tap water into the mixture, and uniformly stirring to obtain the ready-mixed concrete.
The slump of the obtained ready-mixed concrete is 180mm, the expansion is 220mm, the unconfined compressive strength of 28d is 32.3MPa, the cubic compressive strength is 25.2MPa, and the carbon emission of the raw material is about 200Kg CO2/m3.
The method can realize rapid in-site recycling of the engineering waste soil, can realize decrement and low emission, and is beneficial to saving resources and protecting the environment; the prepared soil-based concrete has stable performance, green and low-carbon characteristics and meets the requirements of green construction and construction; and the method has universality, and can realize the preparation of the soil-based concrete recycled by the waste soil of different projects.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A soil-based concrete preparation device is characterized by comprising a screening unit, a grinding unit and a stirring unit which are connected in sequence,
the screening unit is used for removing hard impurities in the waste soil;
the grinding unit is used for grinding the discarded soil after impurity removal to obtain discarded soil powder;
the stirring unit is used for mixing and stirring the waste soil powder, the cementing material powder and the gravel bone;
wherein, the screening unit includes the casing and rotates and locates material loading subassembly in the casing, have at least part on the casing and be the feed inlet that the slope set up downwards and at least part be the discharge gate that the slope set up upwards, the feed inlet with the discharge gate all is located on the direction of rotation of material loading subassembly, just be equipped with the filter screen on the discharge gate, it is a plurality of material loading subassembly be the circumference array set up in the casing to follow the spoil the feed inlet is carried extremely discharge gate department.
2. The apparatus of claim 1, wherein the feeding assembly comprises a connecting rod rotatably disposed in the housing and a hopper for conveying spoil, the hopper is fixedly connected to the connecting rod, and the opening of the hopper faces the rotating direction of the connecting rod.
3. The apparatus according to claim 2, wherein the opening of the hopper is provided with a guide block arranged obliquely, and the guide block is integrally formed with the hopper.
4. The apparatus of any one of claims 1-3, wherein the housing is rotatably provided with a first baffle that at least partially closes the feed opening when the first baffle is rotated to cover the housing.
5. The soil-based concrete preparation device of claim 4, wherein a hook is arranged on the housing, a hanging ring matched with the hook is arranged on the first baffle plate, and when the first baffle plate and the housing are uncovered, the first baffle plate rotates towards the discharge hole, so that the hanging ring is in limit fit with the hook.
6. A device for preparing soil-based concrete according to any one of claims 1 to 3 wherein said housing is provided with a second inclined baffle plate, said second baffle plate having a lower end fixedly attached to said housing and a higher end extending towards said grinding unit.
7. The apparatus for preparing soil-based concrete according to claim 6, wherein a plurality of grooves are formed on the second baffle plate, and a plurality of supporting bars adapted to the grooves are rotatably formed on the housing and used for abutting against the second baffle plate through the grooves.
8. The apparatus for preparing soil-based concrete according to claim 1, wherein the sieving unit and the grinding unit, and the grinding unit and the stirring unit are connected by a conveyor belt.
9. The apparatus for preparing soil-based concrete according to claim 1 or 8, wherein the grinding unit comprises a case and a grinding roller rotatably provided in the case;
the stirring unit comprises a tank body and stirring blades arranged in the tank body in a rotating mode, and a plurality of stirring areas which are of triangular structures are arranged on the stirring blades.
10. A method for preparing an apparatus for preparing soil-based concrete according to any one of claims 1 to 9, comprising the steps of:
s1, putting the dried and crushed waste soil serving as a waste soil raw material into a screening unit and separating hard impurities in the waste soil;
s2, conveying the waste soil raw material subjected to impurity removal into a grinding unit for grinding, and grinding the waste soil raw material into waste soil powder with the particle size smaller than 40 mu m;
s3, adding the waste soil powder, the cementing material and the sandstone aggregate in the step S2 into a stirring unit, and stirring and mixing to obtain a dry-mixed mixture;
s4, adding an additive and water into the stirring unit, and stirring the mixture and the dry-mixed mixture obtained in the step S3 to obtain soil-based concrete;
wherein the drying temperature of the waste soil is 105 ℃, and the drying time is 24h;
the cementing material is one or more of cement, fly ash and slag;
the waste soil powder in the dry-mixed mixture in the step S3 accounts for 20-80% of the cementing material, and the sand rate is 0.4-0.8;
the additive is one or more of polycarboxylic acid water reducing agent, sodium silicate and sodium hydroxide.
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