CN103481376B - A kind of stirring dust collection method of mixing plant and device - Google Patents
A kind of stirring dust collection method of mixing plant and device Download PDFInfo
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- CN103481376B CN103481376B CN201310405683.4A CN201310405683A CN103481376B CN 103481376 B CN103481376 B CN 103481376B CN 201310405683 A CN201310405683 A CN 201310405683A CN 103481376 B CN103481376 B CN 103481376B
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- 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
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
Abstract
The invention provides a kind of stirring dust collection method and device of mixing plant, its method comprises: the aggregate after utilizing water in dust removal in dust-proof water tank to weigh to mixing plant, the described aggregate in discharge process and the described aggregate be dosed in hopper process carry out water spray dedusting; Then water in dust removal total amount used in dust-proof water tank is calculated; Stir required total Water and described water in dust removal total amount used according to aggregate, control formula water tank the actual formula water that should inject in hopper.Like this, ensure that the total Water of the total amount of dedusting water used and formula water required for aggregate stirring,, from being weighed to water for dust removal hopper whipping process not affecting the last concrete moisture content stirring gained at the required total Water of its actual stirring yet, ensure concrete quality to make aggregate.
Description
Technical field
The present invention relates to a kind of mixing plant, the stirring dust collection method of a kind of mixing plant of specific design and device.
Background technology
At present, be gravel, flyash, cement at mixing plant material used, in these materials containing dust or inherently dust form, when production operation, due to Action of Gravity Field or wind-force effect, cause dust from flying, have a strong impact on surrounding environment.Whole mixing plant ground, formation object are all dust a slices, once wind rises, airborne dust rises cruelly especially, becomes the pollution sources in this region.The simultaneously operation of dust to mixing plant in-house facility causes certain influence, brings inconvenience to the Maintenance and Repair of field personnel, and be arranged on the casing upper surfaces such as ground additive due to dust too many, do not rinse for a long time and cause caking phenomenon.
Along with expanding economy, the attention of society to environmental protection, country is to the dust pollution phenomenon of mixing plant also attention further.Some line cities take to the mixing plant producing dust serious the system of not entering now, and along with the development of urbanization process, this requirement certainly will will be carried out in various places, and the mixing plant of dust low emission, zero-emission will more and more be subject to attention and the favor in market.For this reason, the low emission of mixing plant dust, zero-emission will be one of keys of dominating the market, realize the low emission of mixing plant dust, trend place that zero-emission will be mixing plant development.
The dust itself be mingled with in the sand material that mixing plant uses, when sandstone expects aggregate bin, under expect scale hooper, blowing to flat belt, pour in oblique belt transport process, from oblique belt and treat hopper, treat that hopper blowing is to many production processes such as stirring host, all initiation dust is spilt in air, thus cause sand material dust pollution.And to aggregate can be caused after stirring dust watering dedusting to fill a prescription excessive or other situations of water, affect mixing quality.
Therefore, for existing mixing plant in the course of the work, very easily causing the problem of a large amount of dust pollution, is this area technical problem urgently to be resolved hurrily.
Summary of the invention
In view of this, the present invention is intended to propose a kind of stirring dust collection method and device, to solve existing mixing plant in the course of the work, very easily causes the problem of a large amount of dust pollution.
The invention provides a kind of stirring dust collection method of mixing plant, comprising:
Aggregate after utilizing water in dust removal in dust-proof water tank to weigh to mixing plant carries out water spray dedusting;
Water in dust removal in dust-proof water tank is utilized to carry out water spray dedusting to the described aggregate in discharge process;
Water in dust removal in dust-proof water tank is utilized to carry out water spray dedusting to the described aggregate be dosed in hopper process;
Calculate water in dust removal total amount used in dust-proof water tank;
Stir required total Water and described water in dust removal total amount used according to aggregate, control formula water tank the actual formula water that should inject in hopper.
Further, described utilize water in dust removal in dust-proof water tank to weigh to mixing plant after aggregate carry out water spray dedusting; Also comprise before:
Water in dust removal in dust-proof water tank is utilized to carry out water spray dedusting to the aggregate in mixing plant weighing process.
Further, in described calculating dust-proof water tank, water in dust removal total amount used comprises:
Weigh the gross weight before dust-proof water tank dedusting;
Weigh the gross weight after dust-proof water tank dedusting;
Gross weight before the dust-proof water tank dedusting gross weight deducted after dust-proof water tank dedusting obtains water in dust removal total amount used in described dust-proof water tank.
Further, being calculated as of described required total Water::
Calculate described aggregate according to the weight of aggregate and the factory formula that presets and stir required total Water.
Further, described control formula water tank the actual formula water that should inject in hopper comprise:
According to aggregate stir required total Water deduct described water in dust removal total amount used obtain formula water tank the actual formula water weight should injected in hopper.
Further, described dust-proof water tank water in dust removal carries out water spray dedusting after atomization process; And,
Set water spraying time and time delay dwell time in described dust-proof water tank dust removal process.
The present invention also provides a kind of stirring dust arrester of mixing plant, comprising:
To weigh dust arrester, carry out water spray dedusting for the aggregate after weighing to mixing plant;
Discharging dust removal device, for carrying out water spray dedusting to the described aggregate in discharge process;
Feed intake dust arrester, for carrying out water spray dedusting to the described aggregate be dosed in hopper process;
First calculation element, calculates water in dust removal total amount used in dust-proof water tank; Wherein, dust-proof water tank by outlet pipe for dust arrester of weighing, discharging dust removal device and the dust arrester that feeds intake provide water in dust removal;
Control device, stirs required total Water and described water in dust removal total amount used according to aggregate, control formula water tank the actual formula water that should inject in hopper.
Further, dust arrester is weighed described in also for carrying out water spray dedusting to the aggregate in mixing plant weighing process;
Described first calculation element comprises:
First meausring apparatus, weighs the gross weight before dust-proof water tank dedusting;
Second meausring apparatus, weighs the gross weight after dust-proof water tank dedusting;
Wherein, the first calculation element obtains water in dust removal total amount used in described dust-proof water tank according to the gross weight deducted after dust-proof water tank dedusting of the gross weight before dust-proof water tank dedusting.
Further, described control device comprises:
Second calculation element, according to the Weight computation of aggregate, aggregate stirs required total Water;
3rd calculation element, according to aggregate stir required total Water deduct described water in dust removal total amount used obtain formula water tank the actual formula water weight should injected in hopper; Wherein,
Described control device fills a prescription water tank to water filling in hopper according to the actual formula water Weight control should injected in hopper.
Further, described dust-proof water tank water in dust removal connects wide side first water inlet of taper hybrid chamber by water pipe; Wide side second water inlet of described taper hybrid chamber connects high-pressure air pipe;
The leptoprosopy side of described taper hybrid chamber is provided with delivery port, and described delivery port connects shower nozzle by water pipe;
Described control device is also provided with time-setting mechanism, wherein,
Described time-setting mechanism is, setting water spraying time and time delay dwell time.
Compared with prior art, beneficial effect of the present invention
The stirring dust collection method of a kind of mixing plant provided by the invention, comprising: the aggregate after utilizing water in dust removal in dust-proof water tank to weigh to mixing plant, the described aggregate in discharge process and the described aggregate be dosed in hopper process carry out water spray dedusting; Then water in dust removal total amount used in dust-proof water tank is calculated; Stir required total Water and described water in dust removal total amount used according to aggregate, control formula water tank the actual formula water that should inject in hopper.Like this, ensure that the total Water of the total amount of dedusting water used and formula water required for aggregate stirring,, from being weighed to water for dust removal hopper whipping process not affecting the last concrete moisture content stirring gained at the required total Water of its actual stirring yet, ensure concrete quality to make aggregate.
Accompanying drawing explanation
Fig. 1 is the schematic block diagram of the stirring dust collection method of mixing plant in the embodiment of the present invention;
Fig. 2 is the schematic block diagram of the stirring dedusting flow process of mixing plant in the embodiment of the present invention;
Fig. 3 is the structural schematic block diagram of the stirring dust arrester of mixing plant in the embodiment of the present invention;
Fig. 4 is the syndeton schematic diagram of taper hybrid chamber in the embodiment of the present invention;
Fig. 5 is the structural representation of shower nozzle in the embodiment of the present invention.
Description of reference numerals: 1, taper hybrid chamber; 11, the first water inlet; 12, the second water inlet; 13, the first check valve; 14, the second check valve; 15, delivery port; 2, shower nozzle.
Detailed description of the invention
In order to make those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.It should be pointed out that the description to concrete structure in this part and description order are only the explanations to specific embodiment, should not be considered as there is any restriction to protection scope of the present invention.
The embodiment of the present invention provides a kind of stirring dust collection method of mixing plant, and its concrete steps as shown in Figure 1, comprising:
Step one, the aggregate after utilizing water in dust removal in dust-proof water tank to weigh to mixing plant carries out water spray dedusting.
Step 2, utilizes water in dust removal in dust-proof water tank to carry out water spray dedusting to the described aggregate in discharge process.
Step 3, utilizes water in dust removal in dust-proof water tank to carry out water spray dedusting to the described aggregate be dosed in hopper process.
Step 4, calculates water in dust removal total amount used in dust-proof water tank.
Step 5, stirs required total Water and described water in dust removal total amount used according to aggregate, control formula water tank the actual formula water that should inject in hopper.
Like this, ensure that the total amount of dedusting water used and formula water for aggregate stir required for total Water, to make aggregate can effectively dedusting to be weighed to hopper whipping process, nor affect concrete moisture content, guarantee concrete quality.Wherein, described dust-proof water tank is for using water for providing for dedusting, and formula water tank is for supplying the formula water of aggregate stirring.
Also comprise before step one: utilize water in dust removal in dust-proof water tank to carry out water spray dedusting to the aggregate in mixing plant weighing process.
Owing to just easily there is dust raising phenomenon in aggregate weighing process, so just dust removal process can be carried out to aggregate when aggregate is weighed, the aggregate weigh stirred due to each mixing plant is larger, so the less water for dust removal of relative weight can be ignored, so, in aggregate weighing process, just can carry out watering dedusting to the aggregate in weighing, reduce dust raising phenomenon.
Step 4 is specially: first, weighs the gross weight before dust-proof water tank dedusting; Then the gross weight after dust-proof water tank dedusting is weighed; Finally, the gross weight gross weight deducted after dust-proof water tank dedusting before dust-proof water tank dedusting obtains water in dust removal total amount used in institute's dirt water tank.
Need on dust-proof water tank, to arrange LOAD CELLS to weigh the water total amount of dust-proof water tank, due in mixing plant weighing process, in discharge process and the described aggregate be dosed in hopper process all carry out water spray dedusting, in these processes, water used is all the water in dust removal in dust-proof water tank, so accurately can calculate the total amount of dedusting water used; Certainly, alternatively, also can in dust-proof water tank rational height sensor, measure the displacement volume of water in dust removal, to calculate water in dust removal consumption, the embodiment of the present invention does not make concrete limit sensor type, can realize being as the criterion to dust-proof water tank weight measurement.
In step 5, total Water needed for aggregate is, calculates described aggregate stir required total Water according to the weight of aggregate and the factory formula that presets.
After aggregate is weighed, according to the previously stored factory formula of system, calculate the water of corresponding how many kilograms of the aggregate of corresponding weight, the water required for then stirring according to aggregate adds formula water.The amount specifically adding formula water is, according to aggregate stir required total Water deduct described water in dust removal total amount used obtain formula water tank the actual formula water weight should injected in hopper.
Dedusting water used can be made like this to calculate fills a prescription in water used at aggregate, during concrete operations, formula water tank can deduct the amount of water for dust removal when adding formula water to aggregate in hopper, to make the aggregate required water amount of aggregate actual used water for calculating in factory formula, concrete moisture content after stirring is remained unchanged, improves concrete quality.
In addition, for improving dust removing effects, dust-proof water tank water in dust removal can be carried out water spray dedusting after atomization process; And in dust-proof water tank dust removal process, set water spraying time and time delay dwell time.To reach the accurate dedusting to aggregate.
Its specific works process is, whole water for dust removal is all stored in a dust-proof water tank, and LOAD CELLS is installed additional on dust-proof water tank, to measure the weight of dust-proof water tank water, whole aggregate can be contributed in the water for dust removal weight of each process of aggregate to stir in required water total amount, not affect whole concrete formulation quality.
Whole control system can be programmed on host computer by preset program; As shown in Figure 2, host computer setting weigh after aggregate, described aggregate in discharge process and be dosed to time-delay closing time of the aggregate water spray dedusting in hopper process, and, host computer is downloaded the factory formula of Different Weight aggregate correspondence formula water weight.
As shown in Figure 2, depositing dust water is stored in separately in a dust-proof water tank, and formula water is stored in separately in formula water tank.Host computer read the gravimetric value of dust-proof water tank and preserves before water spray dedusting, and dust-proof water tank weight is CC1(KG).By host computer monitoring aggregate at weighing process, then open the dust removal showerhead that corresponding aggregate is weighed, water spray dedusting is carried out to the aggregate in weighing process.Then, aggregate enters discharge process, and by host computer monitoring aggregate at discharge process, then according to the closedown delay time preset, the water spray of time-delay closing aggregate weighing process, opens the water spray dedusting of aggregate discharge process simultaneously.Finally, host computer monitors aggregate and enters in hopper process at converting interface, the water spray dedusting in time-delay closing aggregate discharge process, opens the water spray dedusting of aggregate converting interface simultaneously.
After dedusting terminates water spray, to read and the weight of preserving dust-proof water tank is CC2(KG).Then depositing dust institute water consumption GC(KG is measured), that is: GC=CC1-CC2.In host computer calculate formula water tank in actual should being discharged in hopper unload water weight GA(KG), computational process for: total Water PF1(KG needed for aggregate) deduct depositing dust water consumption GC namely: GA=PF1-GC.Unload when the water yield is GA at formula water tank and stop unloading water.
The course of work of each water spray dedusting is:
Aggregate weighing hopper is sprayed water: monitor send thick essence claim signal time, provide scale hooper water spray dedusting water pipe switch valve start signal, spray water; Treat that sandstone weighs complete, time delay TA(3-5) stop water spray second.
Aggregate dump skip is sprayed water: monitor scale hooper discharging signal time, provide flat belt water spray dedusting water pipe switch valve start signal, spray water; Time delay TA(8-10 after discharging signal is closed) stop water spray second.
Sandstone converting interface atomized water spray: after monitoring sandstone aggregate discharging signal, opens the dedusting of aggregate water spray, time delay TA(10-12 after discharging signal is closed) stop water spray second.
The present invention also provides a kind of stirring dust arrester of mixing plant, as shown in Figure 3, comprising: dust arrester of weighing, discharging dust removal device, the dust arrester that feeds intake, the first calculation element and control device.Wherein, dust arrester of weighing is carry out water spray dedusting for the aggregate after weighing to mixing plant; Discharging dust removal device is used for carrying out water spray dedusting to the described aggregate in discharge process; Feed intake dust arrester for carrying out water spray dedusting to the described aggregate be dosed in hopper process; First calculation element is for calculating water in dust removal total amount used in dust-proof water tank; Control device is stir required total Water and described water in dust removal total amount used according to aggregate, control formula water tank the actual formula water that should inject in hopper.
Wherein, dust arrester of weighing also comprises, and utilizes water in dust removal in dust-proof water tank to carry out water spray dedusting to the aggregate in mixing plant weighing process.
First calculation element comprises: the first meausring apparatus and the second meausring apparatus; First meausring apparatus is weigh the gross weight before dust-proof water tank dedusting; Second meausring apparatus is weigh the gross weight after dust-proof water tank dedusting; Wherein, the first calculation element obtains water in dust removal total amount used in described dust-proof water tank according to the gross weight deducted after dust-proof water tank dedusting of the gross weight before dust-proof water tank dedusting.
Wherein, described control device comprises: the second calculation element and the 3rd calculation element; Second calculation element is the required total Water of aggregate stirring according to the Weight computation of aggregate; 3rd calculation element obtains the actual formula water weight should injected in hopper of formula water tank by deducting described water in dust removal total amount used according to the required total Water of aggregate stirring; Wherein, described control device fills a prescription water tank to water filling in hopper according to the actual formula water Weight control should injected in hopper.
Control device is also provided with time-setting mechanism, and described time-setting mechanism is, setting water spraying time and time delay dwell time.To realize the closedown delay time to dust arrester of weighing, discharging dust removal device and the dust arrester that feeds intake.
Dust-proof water tank by water pipe for dust arrester of weighing, discharging dust removal device and the dust arrester that feeds intake provide water in dust removal, weigh dust arrester, discharging dust removal device and the dust arrester that feeds intake is connected shower nozzle respectively by respective control valve, and control valve is controlled by control device.In addition, dust arrester of weighing is arranged as the aggregate be convenient on weighing unit after weighing process, concrete arrange to be as the criterion to be as the criterion with actual condition; Discharging dust removal device by shower nozzle aim at weigh after aggregate in discharge process, concrete position is as the criterion with actual condition; The aggregate be dosed in hopper process aimed at by discharging dust removal device and the dust arrester that feeds intake, and concrete position is as the criterion with actual condition.
Because water for dust removal is all use the water in dust-proof water tank, so arrange LOAD CELLS bottom dust-proof water tank, and calculate dust-proof water tank dedusting water used by the first calculation element, can the first calculation element be integrated on control device, also can arrange separately; Control device generally uses host computer, control device is by detecting aggregate position, and control is weighed, the control valve of dust arrester, discharging dust removal device and the dust arrester that feeds intake realizes the aggregate dedusting to diverse location, the closedown delay time of then weighed by time-setting mechanism setting dust arrester, discharging dust removal device and the dust arrester that feeds intake.Finally in conjunction with the water for dust removal amount that the first calculation element calculates, control the amount that formula water tank provides the amount of formula water to use for aggregate reality.
Wherein, as shown in Figure 4 and Figure 5, dust-proof water tank water in dust removal connects wide side first water inlet 11 of taper hybrid chamber 1 by water pipe; Wide side second water inlet 12 of described taper hybrid chamber 1 connects high-pressure air pipe; For the ease of controlling water pipe and high-pressure air pipe, water pipe and high-pressure air pipe are respectively arranged with the first check valve 13 and the second check valve 14.The leptoprosopy side of taper hybrid chamber 1 is provided with delivery port 15, states delivery port and connects shower nozzle 2 by water pipe; Shower nozzle 2 is cellular porous shower nozzle, improves atomizing effect.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a stirring dust collection method for mixing plant, is characterized in that, comprising:
Aggregate after utilizing water in dust removal in dust-proof water tank to weigh to mixing plant carries out water spray dedusting;
Water in dust removal in dust-proof water tank is utilized to carry out water spray dedusting to the described aggregate in discharge process;
Water in dust removal in dust-proof water tank is utilized to carry out water spray dedusting to the described aggregate be dosed in hopper process;
Calculate water in dust removal total amount used in dust-proof water tank; Stir required total Water and described water in dust removal total amount used according to aggregate, control formula water tank the actual formula water that should inject in hopper.
2. the stirring dust collection method of mixing plant as claimed in claim 1, is characterized in that: described utilize water in dust removal in dust-proof water tank to weigh to mixing plant after aggregate carry out water spray dedusting before, also comprise:
Water in dust removal in dust-proof water tank is utilized to carry out water spray dedusting to the aggregate in mixing plant weighing process.
3. the stirring dust collection method of mixing plant as claimed in claim 1 or 2, is characterized in that: in described calculating dust-proof water tank, water in dust removal total amount used comprises:
Weigh the gross weight before dust-proof water tank dedusting;
Weigh the gross weight after dust-proof water tank dedusting;
Gross weight before the dust-proof water tank dedusting gross weight deducted after dust-proof water tank dedusting obtains water in dust removal total amount used in described dust-proof water tank.
4. the stirring dust collection method of mixing plant as claimed in claim 3, is characterized in that: described aggregate stirs being calculated as of required total Water:
Calculate described aggregate according to the weight of aggregate and the factory formula that presets and stir required total Water.
5. the stirring dust collection method of mixing plant as claimed in claim 4, is characterized in that: the actual formula water that should inject in hopper of described control formula water tank comprises:
Needed for stirring according to aggregate, total Water deducts described water in dust removal total amount used and obtains the actual formula water weight should injected in hopper of formula water tank.
6. the stirring dust collection method of mixing plant as claimed in claim 5, is characterized in that:
Described dust-proof water tank water in dust removal carries out water spray dedusting after atomization process; And,
Set water spraying time and time delay dwell time in described dust-proof water tank dust removal process.
7. a stirring dust arrester for mixing plant, is characterized in that, comprising:
To weigh dust arrester, carry out water spray dedusting for the aggregate after weighing to mixing plant;
Discharging dust removal device, for carrying out water spray dedusting to the described aggregate in discharge process;
Feed intake dust arrester, for carrying out water spray dedusting to the described aggregate be dosed in hopper process;
First calculation element, calculates water in dust removal total amount used in dust-proof water tank; Wherein, dust-proof water tank by outlet pipe for dust arrester of weighing, discharging dust removal device and the dust arrester that feeds intake provide water in dust removal;
Control device, stirs required total Water and described water in dust removal total amount used according to aggregate, control formula water tank the actual formula water that should inject in hopper.
8. the stirring dust arrester of mixing plant as claimed in claim 7, is characterized in that: described in weigh dust arrester also for carrying out water spray dedusting to the aggregate in mixing plant weighing process;
Described first calculation element comprises:
First meausring apparatus, weighs the gross weight before dust-proof water tank dedusting;
Second meausring apparatus, weighs the gross weight after dust-proof water tank dedusting;
Wherein, the first calculation element obtains water in dust removal total amount used in described dust-proof water tank according to the gross weight deducted after dust-proof water tank dedusting of the gross weight before dust-proof water tank dedusting.
9. the stirring dust arrester of mixing plant as claimed in claim 7, is characterized in that: described control device comprises:
Second calculation element, according to the Weight computation of aggregate, aggregate stirs required total Water;
3rd calculation element, according to aggregate stir required total Water deduct described water in dust removal total amount used obtain formula water tank the actual formula water weight should injected in hopper; Wherein,
Described control device fills a prescription water tank to water filling in hopper according to the actual formula water Weight control should injected in hopper.
10. the stirring dust arrester of mixing plant as claimed in claim 7, is characterized in that: described dust-proof water tank water in dust removal connects wide side first water inlet (11) of taper hybrid chamber (1) by water pipe; Wide side second water inlet (12) of described taper hybrid chamber (1) connects high-pressure air pipe;
The leptoprosopy side of described taper hybrid chamber (1) is provided with delivery port (15), and described delivery port (15) connects shower nozzle (2) by water pipe;
Described control device is also provided with time-setting mechanism, wherein,
Described time-setting mechanism is, setting water spraying time and time delay dwell time.
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| CN104689664B (en) * | 2015-02-17 | 2017-05-10 | 厦门美益集团有限公司 | Dust wastewater treatment method for green production of premixed concrete |
| CN105563657B (en) * | 2015-12-18 | 2018-11-20 | 湖南三一路面机械有限公司 | A kind of mixing plant spraying and dedusting control method and mixing plant |
| CN112428442B (en) * | 2020-11-18 | 2021-10-19 | 四川兴城港瑞建材有限公司 | Aggregate conveying system of concrete mixing station and arrangement method |
| CN112571628A (en) * | 2020-12-05 | 2021-03-30 | 郴州中祁工程材料有限公司 | Water quantity control method and system for concrete mixing plant, electronic equipment and storage medium thereof |
| CN115056357A (en) * | 2022-07-05 | 2022-09-16 | 安徽龙振建设有限公司 | Dustproof control system and method for concrete mixing plant |
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| CN201275803Y (en) * | 2008-08-29 | 2009-07-22 | 河北省第四建筑工程公司 | Water autometering device of mixing apparatus |
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