CN110614724A - Self-falling stirring type UHPC stirring production process and complete equipment - Google Patents

Self-falling stirring type UHPC stirring production process and complete equipment Download PDF

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Publication number
CN110614724A
CN110614724A CN201911013627.XA CN201911013627A CN110614724A CN 110614724 A CN110614724 A CN 110614724A CN 201911013627 A CN201911013627 A CN 201911013627A CN 110614724 A CN110614724 A CN 110614724A
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CN
China
Prior art keywords
stirring
steel fiber
self
falling
water
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Pending
Application number
CN201911013627.XA
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Chinese (zh)
Inventor
欧可活
刘军
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Zhonglu Dura International Engineering Co Ltd
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Zhonglu Dura International Engineering Co Ltd
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Priority to CN201911013627.XA priority Critical patent/CN110614724A/en
Publication of CN110614724A publication Critical patent/CN110614724A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B28C5/0806—Details; Accessories
    • B28C5/0831—Drives or drive systems, e.g. toothed racks, winches
    • 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
    • B28C5/18—Mixing in containers to which motion is imparted to effect the mixing
    • B28C5/20—Mixing in containers to which motion is imparted to effect the mixing rotating about a horizontal or substantially horizontal axis during mixing, e.g. without independent stirrers
    • 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
    • B28C5/18—Mixing in containers to which motion is imparted to effect the mixing
    • B28C5/20—Mixing in containers to which motion is imparted to effect the mixing rotating about a horizontal or substantially horizontal axis during mixing, e.g. without independent stirrers
    • B28C5/2045—Parts or components
    • B28C5/2072—Feeding or discharging mechanisms
    • 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
    • B28C5/18—Mixing in containers to which motion is imparted to effect the mixing
    • B28C5/20—Mixing in containers to which motion is imparted to effect the mixing rotating about a horizontal or substantially horizontal axis during mixing, e.g. without independent stirrers
    • B28C5/24—Mixing in containers to which motion is imparted to effect the mixing rotating about a horizontal or substantially horizontal axis during mixing, e.g. without independent stirrers with driven stirrers
    • 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
    • B28C5/38—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions wherein the mixing is effected both by the action of a fluid and by directly-acting driven mechanical means, e.g. stirring means ; Producing cellular concrete
    • 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
    • B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
    • 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
    • B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
    • B28C5/402—Methods
    • 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
    • B28C5/46—Arrangements for applying super- or sub-atmospheric pressure during mixing; Arrangements for cooling or heating during mixing, e.g. by introducing vapour
    • B28C5/468—Cooling, e.g. using ice
    • 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
    • B28C7/0481—Plant for proportioning, supplying or batching
    • 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
    • B28C7/12—Supplying or proportioning liquid ingredients
    • B28C7/126—Supply means, e.g. nozzles
    • 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
    • B28C9/002—Mixing systems, i.e. flow charts or diagrams; Making slurries; Involving methodical aspects; Involving pretreatment of ingredients; Involving packaging
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

The invention provides a self-falling stirring type UHPC stirring production complete equipment, which comprises: the device comprises a feeding system, a lifting mechanism powder feeding system, a water and additive adding system, a steel fiber feeding system and a self-falling stirring type stirring system; the feeding system comprises at least one set of aggregate lifting system, a weighing hopper and a mixture horizontal conveying device; the lifting mechanism powder feeding system comprises a first conveying pipe, a first powder bin group, a weighing hopper, a second conveying pipe and a second powder bin group, and the water and additive adding system comprises an additive storage tank, a water supply device and an additive mixing and dissolving device; the steel fiber feeding system comprises a first steel fiber metering and lifting device, a first steel fiber screening and distributing machine, a second steel fiber metering and lifting device and a second steel fiber screening and distributing machine; the stirring system comprises at least one self-falling stirring type stirrer. All performance parameters are obviously improved, which shows that the optimization of the production process and the equipment structure has obvious effect on improving the product quality.

Description

Self-falling stirring type UHPC stirring production process and complete equipment
Technical Field
The invention relates to a self-falling stirring type UHPC stirring production process and complete equipment, in particular to a process method and complete equipment for blending, conveying and stirring production of UHPC (ultra high performance concrete).
Background
UHPC is a short for Ultra-High Performance Concrete (Ultra-High Performance Concrete), which is a generic name for cement-based composite materials having a compressive strength of over 150MPa, Ultra-High toughness and Ultra-long durability internationally, mainly comprises quartz sand, silica fume, cement, a water reducing agent, steel fibers and other materials, is constructed according to the principle of maximum compactness, and has Ultra-low water-cement ratio and porosity, so that defects (pores and microcracks) inside the materials can be minimized.
The UHPC material does not contain coarse aggregate, the particle size of the particles is generally less than 1mm, the UHPC material has ultrahigh strength and excellent durability due to high compactness, and the service life can reach more than 200 years. In addition, because the fine steel fibers dispersed in the UHPC can greatly slow down the expansion of micro cracks in the material, the material has ultrahigh toughness and ductility, is the most advanced cement-based civil engineering material in the world at present, and due to the excellent mechanical property and durability, the UHPC has wide application prospect in the field of bridge tunnels and national defense engineering under the background that the requirement of bridge engineering on light weight, high strength, quick erection and durability is required.
However, because the cement content of UHPC is higher and the water content is lower than that of ordinary cement concrete, the UHPC has high hydration heat and large shrinkage in the preparation and casting processes, and a structure crack is easy to form, thereby limiting the application of the UHPC in large-scale concrete engineering.
Through experimental research, the following results are found: the UHPC mixture is subjected to hydration reaction from the beginning of entering a mold, the temperature gradually and slowly rises, the hydration heat release quantity is rapidly increased after the UHPC mixture enters the mold after about 10 hours, the hydration heat release rate is gradually reduced until about 20 hours, the hydration heat release is mainly concentrated in 10-20 hours, the entering mold temperature of the UHPC mixture can be obviously reduced by adding crushed ice, so that the temperature peak of a central point is reduced, the time required for melting the crushed ice is prolonged, the mixing time of the UHPC material is prolonged, the production efficiency is reduced, and the consumption of the mixing power is increased. Meanwhile, when the thickness of the UHPC exceeds 20mm, the temperature difference between the center and the outer edge of the cross section reaches 7.3 ℃, the maximum tensile stress value caused by the temperature difference is 4.63MPa, and cracks are easily generated in the internal structure due to stress imbalance. The temperature stress generated by hydration heat during UHPC production is not negligible.
By adopting the production process and the equipment, various performance parameters of the UHPC concrete structure are obviously improved, which shows that the optimization of the production process and the equipment structure has obvious effect on improving the product quality.
Disclosure of Invention
The invention aims to provide a self-falling stirring type UHPC stirring production process and complete equipment, which can effectively solve the problems that the conventional UHPC stirring process flow is not standard, the power required by equipment driving is large, the production efficiency is low, and a pouring crack is caused by heating in the stirring process of a mixture.
In order to solve the problems, the invention provides a self-falling stirring type UHPC stirring production complete equipment, which comprises: the device comprises a feeding system, a lifting mechanism powder feeding system, a water and additive adding system, a steel fiber feeding system and a self-falling stirring type stirring system; the feeding system comprises at least one set of aggregate lifting system, a weighing hopper and a mixture horizontal conveying device; the lifting mechanism powder feeding system comprises a first conveying pipe, a first powder bin group, a weighing hopper, a second conveying pipe and a second powder bin group, and the water and additive adding system comprises an additive storage tank, a water supply device and an additive mixing and dissolving device; the steel fiber feeding system comprises a first steel fiber metering and lifting device, a first steel fiber screening and distributing machine, a second steel fiber metering and lifting device and a second steel fiber screening and distributing machine; the stirring system comprises at least one self-falling stirring type stirrer.
Furthermore, the aggregate lifting system in the self-falling stirring type UHPC stirring production complete equipment comprises an aggregate lifting hopper, an aggregate vertical lifting device, an aggregate horizontal moving device and four aggregate bins, wherein the aggregate lifting hopper, the aggregate vertical lifting device, the aggregate horizontal moving device and the four aggregate bins are respectively a first aggregate bin, a second aggregate bin, a third aggregate bin and a fourth aggregate bin from small to large according to the size of stored aggregates.
Further, the water and additive system in the self-falling stirring type UHPC stirring production complete equipment also comprises an air pump, and the air pump is used for injecting air into the water.
Further, the gas injected by the gas pump in the self-falling stirring type UHPC stirring production complete equipment is carbon dioxide or nitrogen.
Further, the first steel fiber metering and lifting device in the self-falling stirring type UHPC stirring production complete equipment comprises a first steel fiber metering device, a first steel fiber vertical lifting device and a first steel fiber horizontal conveying device; the second steel fiber metering and lifting device comprises a second steel fiber metering device, a second steel fiber vertical lifting device and a second steel fiber horizontal conveying device.
Further, the self-falling stirring agitator in the self-falling stirring UHPC stirring production complete equipment comprises a stirring barrel shell, wherein the stirring barrel shell comprises a stirring barrel outer cover and a stirring barrel inner cover, and an accommodating space is formed between the stirring barrel outer cover and the stirring barrel inner cover and used for storing cooling circulating water; reinforcing ribs are arranged on the outer stirring barrel cover and the inner stirring barrel cover; the stirring barrel outer cover is provided with a cooling circulating water inlet and a cooling circulating water outlet, cooling circulating water flows in from the cooling circulating water inlet, and flows out from the cooling circulating water outlet after being cooled; a finished product discharge port is also formed in the bottom of the self-falling stirring type stirrer, and a discharge hopper can be arranged at the bottom of the finished product discharge port; still include motor, gear, belt drive, derailleur, wherein the gear has high-speed gear and low-speed gear, still is equipped with the stirring main shaft in the agitator casing, and the power of motor loops through gear, belt drive, derailleur and transmits to the stirring main shaft, and then the drive cover is established and is rotated at the epaxial spiral stirring vane of stirring.
On the other hand, the self-falling stirring type UHPC stirring production process is also provided, and comprises the following steps: feeding quartz sand, feeding powder, feeding water and an additive, feeding steel fiber and stirring; the quartz sand feeding step comprises the steps of weighing quartz sand aggregates according to a ratio and then transmitting the quartz sand aggregates to a self-falling stirring type stirring system; the powder feeding step is that the cement and the silicon powder required in the mixing process are weighed according to the proportion and then are transmitted to a self-falling stirring type stirring system; the water and additive feeding step comprises the steps of firstly injecting gas into water required in the mixing process through an air pump, dissolving the gas, then weighing the water and the additive required in the mixing process according to the proportion, and then transmitting the water and the additive to a self-falling stirring type stirring system; the steel fiber feeding step is that the steel fibers required in the mixing process are weighed according to the proportion and then are transmitted to a self-falling stirring type stirring system; the stirring step is that the circulating step of the cooling circulating water is started firstly, ice water with the temperature close to 0 ℃ enters a cavity in the stirring barrel shell from the inlet of the cooling circulating water through a conveying pipeline, exchanges heat with the inside of the stirring barrel through the inner cover of the stirring barrel, flows out from the outlet of the cooling circulating water and flows back through the pipeline, then the motor is started to stir, and the stirring barrel shell can be always in a low-temperature state in the stirring process.
By adopting the production process and the equipment, various performance parameters of the UHPC concrete structure are obviously improved, which shows that the optimization of the production process and the equipment structure has obvious effect on improving the product quality.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
FIG. 2 is a front view of the overall structure of the plant of the present invention.
FIG. 3 is a top view of the overall structure of the plant of the present invention.
FIG. 4 is a side view of the main building of the mixing plant of the present invention.
FIG. 5 is a schematic diagram of the profile of the main and side views of a self-stirring UHPC mixer of the present invention.
FIG. 6 is a schematic cross-sectional view of a barrel of the self-dropping stirring UHPC stirrer.
FIG. 7 is a schematic view of the transmission mechanism of the self-falling agitator UHPC mixer of the present invention.
Reference numerals:
1: feeding system
11: aggregate lifting system
1101: aggregate elevator bucket
1102: vertical lifting device for aggregate
1103: aggregate horizontal moving device
1104: aggregate bin
12: weighing hopper
13: horizontal conveying device for mixed materials
2: powder feeding system of lifting mechanism
21: first material conveying pipe
22: first powder bin group
2201: first powder bin
23: first weighing hopper
24: second material conveying pipe
25: second powder bin group
2501: second powder bin
26: second weighing hopper
3: water and additive addition system
31: additive storage tank
32: water supply device
33: additive mixing and dissolving device
4: steel fiber feeding system
41: first steel fiber metering and lifting device
4101: first steel fiber metering device
4102: first steel fiber vertical lifting device
4103: first steel fiber horizontal conveying device
42: first steel fiber screening and distributing machine
43: second steel fiber metering and lifting device
4301: second steel fibre metering device
4301: second steel fiber vertical lifting device
4303: second steel fiber horizontal conveying device
44: second steel fiber screening and distributing machine
5: single horizontal shaft type stirring system:
51: first self-falling type stirrer
511: mixing drum shell
511A: mixing drum outer cover
511B: inner cover of mixing drum
511C: reinforcing rib
512: cooling circulating water inlet
513: cooling circulating water outlet
514: electric push rod
515: low-speed stirring controller
516: high-low speed control shifting fork
517: high-speed stirring controller
518: electric machine
519: motor output shaft
520: sliding key
521: sliding gear
522: high-speed output gear
523: low-speed output gear
524: duplicate gear
525: transmission key
526: high-low speed control output shaft
527: belt wheel transmission device
528: speed variator
529: transmission output gear
530: stirring input gear
531: spiral stirring blade
532: discharge hopper
533: feed hopper
52: second self-falling type stirrer
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to the drawings, there is shown below a self-falling stirred UHPC stirred production plant of the present embodiment, comprising: the device comprises a feeding system 1, powder 2, a water and additive adding system 3, a steel fiber feeding system 4 and a self-falling stirring system 5.
The feeding system 1 is described below, the feeding system 1 includes 2 sets of aggregate lifting systems 11, a weighing hopper 12, and a mixture horizontal conveying device 13, the aggregate lifting system 11 includes an aggregate lifting hopper 1101, an aggregate vertical lifting device 1102, an aggregate horizontal moving device 1103, and 4 aggregate bins 1104, and the aggregate lifting systems are respectively a first aggregate bin, a second aggregate bin, a third aggregate bin, and a fourth aggregate bin from small to large according to sizes of stored aggregates. When the aggregate bin 1104 needs to be charged, the aggregates firstly enter the aggregate vertical lifting device 1102 through the aggregate lifting hopper 1101, are lifted to the top, and then are conveyed into the aggregate bin 1104 through the aggregate horizontal moving device 1103.
Next, a powder feeding system 2 will be described, wherein the powder feeding system 2 comprises a first powder conveying pipe 21, a first powder bin group 22, a weighing hopper 23, a second powder conveying pipe 24 and a second powder bin group 25, as the powder materials required in the mixing process comprise cement and silica fume, two powder material bin groups are provided, wherein, the first powder bin group 22 comprises a first powder bin 2201, the second powder bin group 25 comprises a second powder bin 2501, when powder needs to be filled, under the action of high-pressure gas, the powder is respectively blown into the first powder bin 2201 and the second powder bin 2501 through the first material conveying pipe 21 and the second material conveying pipe 24, and during production, the cement in the first silo group 2201 is conveyed to the first weighing hopper 23 by the screw conveyer 2502 for accumulative weighing and metering, and the silica fume in the second powder bin group 2501 is conveyed to the second weighing hopper 26 by the screw conveyer 2502 for cumulative weighing.
Next, a water and additive adding system 3 is introduced, wherein the water and additive system 3 comprises an additive storage tank 31, a water supply device 32 and an additive mixing and dissolving device 33, and the additive and water are metered and then enter the additive mixing and dissolving device 33 to be fully mixed and dissolved.
Because the UHPC material is very viscous after being mixed, the resistance during the mixing process is very large, and the pumping process is also relatively high, a special concrete pumping device is needed to pump, and the pumping adaptability is poor, the water and additive adding system 3 can further comprise an air pump (not shown in the figure), gas (such as carbon dioxide, nitrogen and other gases) is injected into the water through the air pump and dissolved, so that the water with the dissolved gas participates in the mixing process, the added gas is released from the water, and can also absorb heat, so that the temperature during the mixing process is reduced, and a large number of micro bubbles are formed inside the UHPC material, thereby effectively reducing the viscosity, reducing the mixing resistance, and also effectively reducing the resistance during the pumping process.
Introducing a steel fiber feeding system 4, wherein the steel fiber feeding system 4 comprises a first steel fiber metering and lifting device 41, a first steel fiber screening and distributing machine 42, a second steel fiber metering and lifting device 43 and a second steel fiber screening and distributing machine 44, wherein the first steel fiber metering and lifting device 41 comprises a first steel fiber metering device 4101, a first steel fiber vertical lifting device 4102 and a first steel fiber horizontal conveying device 4103, steel fibers are unpacked, conveyed into the first steel fiber metering and lifting device 41, weighed and metered by the first steel fiber metering device 4101, lifted to the top of the complete equipment by the first steel fiber vertical lifting device 4102, and conveyed to the first steel fiber screening and distributing machine 42 by the first steel fiber horizontal conveying device 4103 to enter a screening procedure; similarly, the second steel fiber metering and lifting device 43 includes a second steel fiber metering device 4301, a second steel fiber vertical lifting device 4302, and a second steel fiber horizontal conveying device 4303, the steel fibers are unpacked and then sent to the second steel fiber metering and lifting device 43, and then weighed and metered by the second steel fiber metering device 4301, and lifted to the top of the plant by the second steel fiber vertical lifting device 4302, and then conveyed to the second steel fiber screening and distributing machine 44 by the second steel fiber horizontal conveying device 4303, so as to enter the screening procedure.
Next, a self-falling type stirring system 5 will be described, wherein the stirring system 5 comprises a first self-falling type stirrer 51 and a second self-falling type stirrer 52, the two stirrers are produced in a matched manner, while one mixer can be used for mixing ingredients, the first falling-type mixer 51 is described as an example, the first falling-type mixer 51 includes a mixer barrel housing 511, wherein the stirring barrel shell 511 comprises a stirring barrel outer cover 511A and a stirring barrel inner cover 511B, a containing space is provided between the stirring barrel outer cover 511A and the stirring barrel inner cover 511B for storing cooling circulating water, and simultaneously for strengthening the strength, the stirring barrel outer cover 511A and the stirring barrel inner cover 511B are also provided with reinforcing ribs 511C, the stirring barrel outer cover 511A is provided with a cooling circulating water inlet 512 and a cooling circulating water outlet 513, cooling circulating water flows in from the cooling circulating water inlet 512, and flows out from the cooling circulating water outlet 513 after being cooled; the outer circle of the stirring cylinder shell 511 is welded with a stirring input gear 530, the stirring input gear 530 is connected with a transmission output gear 529 arranged on an output shaft of a speed changer 528, 2 pairs of spiral stirring blades 531 are welded in the inner stirring cylinder cover 511B, and each pair of spiral stirring blades 531 consists of 2 stirring blades with different structural sizes and installation sizes. One end of the mixing drum housing 511 is closed, the other end is open, a discharge hopper 532 is arranged at the lower end of the opening, and a feed hopper 533 is arranged at the upper end.
A plurality of vent pipes can be uniformly arranged at the bottom of the stirring barrel shell 511, a plurality of vent holes are uniformly arranged on the vent pipes, and the vent pipes inject gas into the stirring barrel shell 511 through an air pump, so that the gas can be injected into the stirring process, the viscosity of concrete can be effectively reduced, and the temperature in the stirring process can be better reduced. Preferably, to better reduce problems, the injected gas may be a cryogenic gas (temperature below 10 degrees celsius).
The power of the motor 518 is transmitted to the stirring main shaft 531 through the gear shifter and the gear box 528 in sequence, so as to drive the stirring blade 533 to rotate, the gear shifter has two gears, namely a high gear and a low gear, and the high gear and the low gear can be selected according to actual use. The specific driving structure is as follows: the motor is provided with a motor output shaft 519, the gear engaging device comprises a high-speed output gear 522, a sliding gear 521 and a low-speed output gear 523 which are sequentially sleeved on the motor output shaft 519, the sliding gear 521 is fixed on the motor output shaft 519 in the radial direction through a sliding key 520, the high-speed output gear 522 and the low-speed output gear 523 are both meshed with a duplicate gear 524 sleeved on a high-low speed control output shaft 526, the duplicate gear 524 is fixed on the high-low speed control output shaft 526 in the radial direction through a transmission key 525, in order to switch between a high-speed state and a low-speed state, a high-low speed control shifting fork 516 is further arranged, the high-low speed control shifting fork 516 is switched between the high-speed state and the low-speed state under the action of an electric push rod 514, correspondingly, a low-speed stirring controller 515 and a high-speed stirring controller 517 are arranged at two limit positions of the high-low speed control shifting fork 516, the electric push rod 514, when the high-speed and low-speed control shifting fork 516 touches the low-speed stirring controller 515 or the high-speed stirring controller 517, the action is stopped, when the low-speed stirring controller 515 is touched, the external teeth of the sliding gear 521 are completely sleeved with the internal teeth of the low-speed output gear 523, correspondingly, when the high-speed stirring controller 517 is touched, the external teeth of the sliding gear 521 are completely sleeved with the internal teeth of the high-speed output gear 522, so that the motor 518 can obtain two different rotating speeds of high speed and low speed. The gear-engaging device then transmits the power to the transmission 528 through the belt transmission 527, and the transmission 528 transmits the power to the agitator housing 511 after the speed reduction is completed, and can also transmit the power to the agitator housing 511 and the helical agitator blade 531 mounted thereon to rotate after the speed reduction is performed again through the transmission output gear 529 and the agitator input gear 530. The second self-falling stirring agitator 52 has a structure identical to that of the first self-falling stirring agitator 51, and is not described herein again.
The stirring production process based on the complete equipment is shown below, and specifically comprises a quartz sand feeding step, a powder feeding step, a water and additive feeding step, a steel fiber feeding step and a stirring step, wherein the quartz sand feeding step is to weigh quartz sand aggregates according to a ratio and then transmit the weighed quartz sand aggregates to a gravity type stirring system 5; the powder feeding step is that the cement and the silicon powder required in the mixing process are weighed according to the proportion and then transmitted to an gravity stirring system 5; the water and additive feeding step is that the water and the additive required in the mixing process are weighed according to the proportion and then are transmitted to the gravity type stirring system 5; the steel fiber feeding step is that the steel fibers required in the mixing process are weighed according to the proportion and then transmitted to an gravity type stirring system 5; the stirring step is that the circulating step of the cooling circulating water is started firstly, ice water with the temperature close to 0 ℃ enters a cavity in the stirring barrel shell 511 from the cooling circulating water inlet 512 through a conveying pipeline, exchanges heat with heat in the stirring barrel through the inner cover 511B of the stirring barrel, flows out from the cooling circulating water outlet 513 and flows back through the pipeline, then the motor is started for stirring, and the stirring barrel shell can be in a low-temperature state all the time in the stirring process. And the electric push rod 514 drives the high-low speed control shift fork 516 through an automatic control program so as to switch between the low speed state and the high speed state. Since the gravity type stirring system 5 includes two sets of stirring machines, namely, a first gravity type stirring machine 51 and a second gravity type stirring machine 52, when one of the stirring machines is stirring, the other stirring machine can be prepared, so that the continuous operation can be realized.
Taking a commonly used 1-cube self-falling stirring UHPC stirrer as an example, the motor power is 37Kw, and after the high-low speed driving conversion mode is changed, the motor power is 30Kw, so that the energy-saving effect is obvious.
In order to verify the superiority and effectiveness of the UHPC stirring production process, the table 1 shows the proportion of a single label of a certain UHPC, the table 2 shows the change of the temperature of the UHPC mixture produced by the traditional process and the UHPC mixture produced by the process along with time, and the table 3 shows the comparison of the performance test results of the UHPC mixture produced by the traditional process and the UHPC mixture produced by the process.
Table 1 shows the ratio of a single label for a certain UHPC (unit: kg/m)3)
The materials used UHPC dry powder Water (W) Steel fiber
Specific gravity of 2238 156 175
TABLE 2 ambient temperature 28 deg.C for the case of time-dependent changes in the temperature of the UHPC blend produced by the conventional process and that of the UHPC blend produced by the present process
Table 3 shows the comparison of the performance test results of the UHPC mixture in the conventional process flow and the present process flow
As is apparent from the results in Table 2, by adopting the production process and the equipment of the invention, the temperature of the UHPC mixture is kept in a low temperature state after 100 minutes, which is favorable for counteracting the high temperature of a concrete structure caused by the concentrated release of hydration heat within 10-20 hours after the UHPC mixture is poured into a mold, preventing the generation of pouring cracks and improving the quality of the structure.
As is evident from the results in Table 3, the production process and equipment of the present invention significantly improve various performance parameters of UHPC concrete structures, which indicates that the optimization of the production process and equipment structure has significant effect on improving the product quality.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (7)

1. A self-falling stirring type UHPC stirring production complete equipment is characterized by comprising:
the device comprises a feeding system (1), a lifting mechanism powder feeding system (2), a water and additive adding system (3), a steel fiber feeding system (4) and a self-falling stirring type stirring system (5);
the feeding system (1) comprises at least one set of aggregate lifting system (11), a weighing hopper (12) and a mixture horizontal conveying device (13);
the lifting mechanism powder feeding system (2) comprises a first material conveying pipe (21), a first powder bin group (22), a weighing hopper (23), a second material conveying pipe (24) and a second powder bin group (25),
the water and additive adding system (3) comprises an additive storage tank (31), a water supply device (32) and an additive mixing and dissolving device (33);
the steel fiber feeding system (4) comprises a first steel fiber metering and lifting device (41), a first steel fiber screening and distributing machine (42), a second steel fiber metering and lifting device (43) and a second steel fiber screening and distributing machine (44);
the stirring system (5) comprises at least one self-falling stirring type stirrer.
2. The self-contained stirred UHPC stirred production plant according to claim 1, wherein:
the aggregate lifting system (11) comprises an aggregate lifting hopper (1101), an aggregate vertical lifting device (1102), an aggregate horizontal moving device (1103) and four aggregate bins (1104), wherein the aggregate lifting hopper is divided into a first aggregate bin, a second aggregate bin, a third aggregate bin and a fourth aggregate bin from small to large according to the size of stored aggregates.
3. The self-contained stirred UHPC stirred production plant according to claim 1, wherein:
the water and additive system (3) further comprises an air pump for injecting air into the water.
4. The self-contained stirred UHPC stirred production plant according to claim 3, wherein:
the gas injected by the gas pump is carbon dioxide or nitrogen.
5. The self-contained stirred UHPC stirred production plant according to claim 4, wherein:
the first steel fiber metering and lifting device (41) comprises a first steel fiber metering device (4101), a first steel fiber vertical lifting device (4102) and a first steel fiber horizontal conveying device (4103);
the second steel fiber metering and lifting device (43) comprises a second steel fiber metering device (4301), a second steel fiber vertical lifting device (4302) and a second steel fiber horizontal conveying device (4303).
6. The self-contained stirred UHPC stirred production plant according to claim 5, wherein:
the self-falling stirring type stirrer comprises a stirring barrel shell (511), wherein the stirring barrel shell (511) comprises a stirring barrel outer cover (511A) and a stirring barrel inner cover (511B), and an accommodating space is formed between the stirring barrel outer cover (511A) and the stirring barrel inner cover (511B) and used for storing cooling circulating water;
the stirring barrel outer cover (511A) and the stirring barrel inner cover (511B) are also provided with a reinforcing rib (511C);
the stirring barrel outer cover (511A) is provided with a cooling circulating water inlet (512) and a cooling circulating water outlet (513), cooling circulating water flows in from the cooling circulating water inlet (512), and flows out from the cooling circulating water outlet (513) after being cooled;
a finished product discharge port (534) is also formed in the bottom of the self-falling stirring type stirrer, and a discharge hopper (532) can be arranged at the bottom of the finished product discharge port (534);
still include motor (518), gear, belt drive (527), derailleur (528), wherein the gear has high-speed gear and low-speed gear, still be equipped with stirring main shaft (531) in agitator housing (511), the power of motor (518) loops through the gear the belt drive (527) transmission to stirring main shaft (531), and then spiral stirring vane (531) that the drive cover was established on stirring main shaft (531) rotate.
7. A self-falling stirring type UHPC stirring production process is characterized by comprising the following steps:
feeding quartz sand, feeding powder, feeding water and an additive, feeding steel fiber and stirring;
the quartz sand feeding step comprises the steps of weighing quartz sand aggregates according to a ratio and then transmitting the quartz sand aggregates to a self-falling stirring type stirring system 5; the powder feeding step is that the cement and the silicon powder required in the mixing process are weighed according to the proportion and then are transmitted to a self-falling stirring type stirring system 5;
the water and additive feeding step comprises the steps of firstly injecting gas into water required in the mixing process through an air pump, dissolving the gas, then weighing the water and the additive required in the mixing process according to the proportion, and then transmitting the water and the additive to a self-falling stirring type stirring system 5;
the steel fiber feeding step is that the steel fibers required in the mixing process are weighed according to the proportion and then are transmitted to a self-falling stirring type stirring system 5;
the stirring step is that the circulating step of the cooling circulating water is started firstly, ice water with the temperature close to 0 ℃ enters a cavity in the stirring barrel shell 511 from the cooling circulating water inlet 512 through a conveying pipeline, exchanges heat with heat in the stirring barrel through the inner cover 511B of the stirring barrel, flows out from the cooling circulating water outlet 513 and flows back through the pipeline, then the motor is started for stirring, and the stirring barrel shell can be in a low-temperature state all the time in the stirring process.
CN201911013627.XA 2019-10-23 2019-10-23 Self-falling stirring type UHPC stirring production process and complete equipment Pending CN110614724A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112604590A (en) * 2020-12-17 2021-04-06 长安大学 Automatic batching method for multi-medium pavement material

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CN108298667A (en) * 2018-04-09 2018-07-20 佛山水木金谷环境科技有限公司 A kind of microparticle disperse water system
CN110065166A (en) * 2019-05-14 2019-07-30 山推建友机械股份有限公司 A kind of ultra-high performance concrete mixing plant
CN212147017U (en) * 2019-10-23 2020-12-15 中路杜拉国际工程股份有限公司 From stirring formula UHPC stirring production complete sets that falls

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Publication number Priority date Publication date Assignee Title
CN106476145A (en) * 2016-12-13 2017-03-08 顾广才 A kind of vertical cement slurry processor of achievable bilayer cooling effect
CN108298667A (en) * 2018-04-09 2018-07-20 佛山水木金谷环境科技有限公司 A kind of microparticle disperse water system
CN110065166A (en) * 2019-05-14 2019-07-30 山推建友机械股份有限公司 A kind of ultra-high performance concrete mixing plant
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* Cited by examiner, † Cited by third party
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