CN113426548B - Control method for wet screening and dry crushing process of fine crushing workshop in machine-made gravel - Google Patents
Control method for wet screening and dry crushing process of fine crushing workshop in machine-made gravel Download PDFInfo
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- CN113426548B CN113426548B CN202110721084.8A CN202110721084A CN113426548B CN 113426548 B CN113426548 B CN 113426548B CN 202110721084 A CN202110721084 A CN 202110721084A CN 113426548 B CN113426548 B CN 113426548B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention provides a control method of a wet screening and dry crushing sand process of a fine crushing workshop in machine-made sand, which comprises the following steps: aggregate crushed in a medium and fine crushing workshop is conveyed to a water-sand mixer to be mixed with water, and then is conveyed to each part of the workshop by a metering adhesive tape machine after being screened, a flow valve is arranged on a water inlet pipe of the water-sand mixer, a mass ratio control range, a water content control range and an intelligent control meter for water-sand mixing are preset in a control system of an intelligent control center, weighing and water content data of the metering adhesive tape machine are collected in real time, water supply flow of the flow valve is controlled according to the water-sand mass ratio, and when the water-sand mass ratio exceeds the control range, early warning is carried out to inform personnel of treatment. The intelligent control of technological process parameters is realized, the aggregate is weighed by a metering tape machine, the water blending amount is controlled by a flow valve, the water sand blending proportion can be effectively controlled, the optimal range is controlled, and the optimal dehydration and desliming effect is obtained.
Description
Technical Field
The invention belongs to the technical field of machine-made sandstone processing, and particularly relates to a control method of a wet screening and dry crushing sand making process in a fine crushing workshop in machine-made sandstone.
Background
The semi-finished ore subjected to the dry-method desliming treatment contains mainly fine particles with the particles larger than the size fraction removed by a desliming screen or strong adhesion. After the medium crushing, large-particle soil is generally crushed into fine particles, and the water solubility of the large-particle soil is enhanced. Therefore, in the fine crushing workshop in the preparation process of the high-quality machine-made sandstone, the wet method is adopted for desliming again, and the quality of the intermediate product entering the ultra-fine crushing workshop is ensured to meet the control requirement. However, water is introduced again through wet-method desliming, and during subsequent superfine crushing, the crushing efficiency is low due to overhigh water content, an effective quality control means is lacked in the prior art, the water content is lacked in monitoring, the superfine crushing efficiency and quality are directly influenced, and the processing requirement of high-quality machine-made gravels cannot be met.
Disclosure of Invention
In order to solve the technical problems, the invention provides a control method of a wet-screening dry-crushing sand making process of a fine crushing workshop in machine-made sand, which realizes intelligent control of process flow parameters, the blended aggregate is weighed by a metering tape machine, the blending water quantity is controlled by a flow valve, the water-sand blending proportion can be effectively controlled, the optimal range is controlled, and the optimal dewatering and desliming effects are obtained.
The invention is realized by the following technical scheme:
a control method for a wet screening and dry crushing process of a fine crushing workshop in machine-made gravels comprises the following steps: conveying crushed aggregates from a medium and fine crushing workshop to a water-sand mixer to mix with water, then conveying the aggregates to each part of the workshop through a screen by a metering adhesive tape machine, arranging a moisture content detector on the metering adhesive tape machine, arranging a flow valve on a water inlet pipe of the water-sand mixer, presetting a mass ratio control range, a moisture content control range and an intelligent control table of water-sand mixing in a control system of an intelligent control center, acquiring weighing and moisture content data of the metering adhesive tape machine in real time, controlling water supply flow of the flow valve according to the mass ratio of water to sand, and giving an early warning to inform personnel to process when the mass ratio of water to sand exceeds the control range; when the water-sand mass ratio is unreasonable, the silt dilution water amount is insufficient or surplus, and the water amount is insufficient, the mud-powder adhesion is strong, so that the desliming effect of the intermediate product is poor or the sieving rate is reduced. If the amount of water is too large, the dewatering effect is not good. The blending aggregate is weighed by a metering adhesive tape machine, the blending water amount is controlled by a flow valve, the water sand blending proportion can be effectively controlled, the optimal range is controlled, the optimal dehydration and desliming effect is obtained, whether the water content exceeds the standard or not is judged in real time, the water content exceeds the standard and is regulated and controlled according to an intelligent regulation and control meter, early warning is carried out when the control range of each parameter cannot be met, the personnel are informed to handle, the aggregate water content is monitored in real time, the follow-up superfine crushing efficiency and quality are ensured, and the processing requirement of high-quality mechanism sand stones is met.
Preferably, the mass ratio of the water sand is controlled within the range of 35-40%, and the screening, dewatering and desliming effects are optimal.
After the aggregates are sieved, large aggregates with the particle size of more than 40mm are returned to a medium-crushing or fine-crushing adjusting bin through a first metering adhesive tape machine; the medium aggregate with the particle size of more than or equal to 5mm and less than or equal to 40mm is conveyed to a superfine adjusting bin through a second metering adhesive tape machine; conveying the fine aggregate with the particle size smaller than 5mm to a spiral sand washer, and conveying the fine aggregate to a fine aggregate blending workshop or a rod mill workshop through a third metering adhesive tape machine; the weight ratio of the conveying capacity of the large aggregate and the middle aggregate to the total feeding capacity and the control range of the weight ratio are preset in a control system of an intelligent control center respectively, the weighing of a first measuring adhesive tape machine, a second measuring adhesive tape machine and a third measuring adhesive tape machine is collected in real time, the weight ratio of the large aggregate and the middle aggregate is calculated, and early warning is carried out according to an intelligent control meter when the weight ratio of the large aggregate and the middle aggregate exceeds the control range. Through the regulation and control of balanced, homogeneous and crushed products, the size distribution fluctuation of the medium and fine crushed products is small, and if one screening device is normal, the proportion fluctuation of each level of the classification is small. Therefore, the operation condition of the screening equipment and the quality of the intermediate product can be judged by monitoring the conveying capacity of the receiving adhesive tape machines at all levels, and the abnormal conditions can be timely processed by monitoring in real time.
The control range of the water content of the aggregate in the control system of the intelligent control center is less than 3%, when the water content of the aggregate in the monitoring process is more than or equal to 3%, the water supply amount is reduced by controlling the flow valve until the water content is less than 3%, and when the water supply amount ratio is reduced to the lower limit of the water-sand mass ratio, the water content is still higher than 3%, an early warning is given, and a person is informed to process.
When the weight ratio of the large aggregate to the total feeding quantity is higher than the upper limit of a control range, the early warning item is sieve pore blockage or insufficient exciting force; and when the weight ratio of the large aggregate to the total feeding quantity is lower than the lower limit of the control range, the early warning item is sieve mesh abrasion or breakage and leakage.
The control range of the weight ratio of the large aggregate to the total feeding amount is +/-3%.
When the weight ratio of the medium aggregate to the total feeding amount is higher than the upper limit of the control range, the early warning items are wear of the upper-layer sieve holes or material leakage caused by breakage or hole plugging of the sieve screen of the layer; and when the weight ratio of the medium aggregate to the total feeding quantity is lower than the lower limit of the control range, the early warning items are that the upper-layer screen is blocked in holes or the screen in the layer is worn or broken and leaks.
The control range of the weight ratio of the medium aggregate to the total feeding amount is +/-3%.
The method comprises the following steps that an overflow height control valve and a concentration meter are arranged in a spiral sand washer, the flowing water concentration and overflow amount of the spiral sand washer and a control range of the flowing water concentration and overflow amount are preset in a control system of an intelligent control center, and when the conveying amount of wet sand cleaned by the spiral sand washer is increased, so that the water content of the wet sand is increased, the overflow amount is reduced, and the flowing water concentration is reduced and exceeds the control range, the overflow height of the sand washer is over-high, and the desliming condition is poor; when the wet sand conveying amount is reduced, the moisture content of the wet sand is reduced, the overflow amount is increased, and the flowing water concentration is increased to exceed the control range, the early warning sand washer has the defects of low overflow height and poor desliming condition. Under the condition of homogeneous material source, the fluctuation of the amount of the mud powder taken away by the overflow trough of the sand washer is small, so that the proportion of the material source to the blending water can be indirectly judged by monitoring the overflow concentration of the sand washer. Meanwhile, the overflow height of the spiral sand washer can be determined through a manufacturability test, so that the overflow height with the minimum amount of powder sand to be taken away and the desliming effect meeting the operation requirement is obtained.
The control range of the wet sand conveying amount is +/-3%, the control range of the wet sand water content is +/-2%, the control range of the flowing water concentration of the spiral sand washer is +/-1%, and the control range of the overflow amount is +/-3%.
The invention has the beneficial effects that:
compared with the prior art, the intelligent control of technological process parameters is realized, the aggregate blending is weighed by a metering adhesive tape machine, the blending water amount is controlled by a flow valve, the water sand blending proportion can be effectively controlled, the optimal range is controlled, and the optimal dehydration and desliming effects are obtained. The aggregate moisture content is monitored in real time, the follow-up superfine crushing efficiency and quality are guaranteed, and the processing requirement of high-quality machine-made gravels is met. The conveying capacity of each level of receiving adhesive tape machine after one screen is monitored, the running condition of the screening equipment and the quality of the intermediate product are judged, and the monitoring is carried out in real time to timely handle abnormal conditions. By monitoring the overflow concentration of the sand washer, the proportion of the material source to the blending water is indirectly judged, the control effect of blending water and sand is improved, the overflow height is controlled, the beneficial effect of minimum silt carrying capacity is obtained under the condition that the desliming effect meets the operation requirement, and the subsequent silt content regulation and control cost can be reduced.
Drawings
FIG. 1 is a schematic diagram of the architecture and control connections of the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1, a control method of a wet screening and dry crushing process of a fine crushing workshop in machine-made sand comprises the following steps: the aggregate crushed in the medium and fine crushing workshop is conveyed to a water-sand mixer to be mixed with water, and then is conveyed to each part of the workshop through a screen by a metering adhesive tape machine, a moisture content detector is arranged on the metering adhesive tape machine, a flow valve is arranged on a water inlet pipe of the water-sand mixer, a mass ratio control range, a moisture content control range and an intelligent control table of water-sand mixing are preset in a control system of an intelligent control center, weighing and moisture content data of the metering adhesive tape machine are collected in real time, and water supply flow of the flow valve is controlled according to the mass ratio of the water to the sand. Crushing the crushed sludge mass into fine particles through medium-fine crushing, flushing the crushed aggregate and high-pressure water into a water-sand mixer, and fully dissolving the fine particles (particles smaller than 2 mm) and the water after passing through a hopper and a chute to form a water-sand mixture. When the water-sand mixture is screened on the first section of screen (about 1/3 screen area), the separation is rapid, and the desliming effect can be effectively ensured. The screen in the latter half (about 2/3 screen area) has the main functions of aggregate classification and dehydration without silt, so that the dehydration effect can be effectively ensured.
After the aggregates are sieved, the large aggregates with the particle size of more than 40mm are returned to a medium-sized or fine-ground adjusting bin through a first metering adhesive tape machine; the medium aggregate with the particle size of more than or equal to 5mm and less than or equal to 40mm is conveyed to a superfine adjusting bin through a second metering adhesive tape machine; conveying the fine aggregate with the particle size smaller than 5mm to a spiral sand washer, wherein the fine aggregate cleaned by the spiral sand washer is called wet sand in the industry, and conveying the wet sand to a fine aggregate blending workshop or a rod mill workshop by a third metering adhesive tape machine; the weight ratio of the conveying amount of the large aggregate and the medium aggregate to the total feeding amount and the control range of the weight ratio are preset in a control system of an intelligent control center respectively, the weight ratio of the large aggregate and the medium aggregate is calculated by weighing the large aggregate and the medium aggregate through a first metering adhesive tape machine and a second metering adhesive tape machine in real time, and when the weight ratio exceeds the control range, early warning is carried out according to an intelligent control table.
The fine aggregate is spirally stirred in a spiral sand washer, and fine particles with good water solubility and low sedimentation speed of the mud powder overflow from an overflow port of the spiral sand washer together with water. The spiral sand washer is provided with an overflow height control valve and a concentration meter, and the control system of the intelligent control center is preset with the flowing water concentration and the overflow amount of the spiral sand washer and the control range of the flowing water concentration and the overflow amount.
The intelligent control center monitors the parameters, when any one parameter is abnormal, the parameter is regulated and controlled according to the scheme of the intelligent regulation and control table, and early warning is carried out when the control range of each parameter cannot be met, so that personnel are informed to carry out processing. The monitoring parameters of the intelligent control center are shown in a table 1, and the scheme of the intelligent control and early warning parameter table is shown in a table 2.
Table 1 table of parameters for detecting wet sieving and dry breaking process
TABLE 2 Intelligent regulation and control and early warning parameter table
Main monitoring parameters and principles:
the mass ratio of water to sand is as follows: when the water-sand mass ratio is unreasonable, the silt dilution water amount is insufficient or surplus, and the water amount is insufficient, the mud-powder adhesion is strong, so that the desliming effect of the intermediate product is poor or the sieving rate is reduced. If the amount of water is too large, the dewatering effect is not good. The productivity test shows that when the water consumption for dilution is 35-40% of the mass ratio of the feeding amount, the screening, dehydration and desliming effects are the best. Therefore, the aggregate is blended and measured by a measuring tape machine, and the reclaimed water amount is measured by a flow control valve. The water sand blending ratio can be effectively controlled.
Monitoring the grading proportion: through the regulation and control of balanced homogeneous crushing, the size distribution fluctuation of the crushed products in medium and fine crushing is small, and if one sieve device is normal, the proportion fluctuation of each level of the separated products is small. Therefore, the operation condition of the screening equipment and the quality of the intermediate product can be judged by monitoring the conveying capacity of the receiving adhesive tape machines at all levels.
③ concentration of overflow water of sand washer: under the condition of homogeneous material source, the fluctuation of the amount of the mud powder taken away by the overflow groove of the sand washer is small, so that the proportion of the material source to the reclaimed water can be indirectly judged by monitoring the overflow concentration of the sand washer. Meanwhile, the overflow height of the spiral sand washer can be determined through a manufacturability test, so that the overflow height with the minimum amount of powder sand to be taken away and the desliming effect meeting the operation requirement is obtained.
In addition, because different mine raw materials have larger quality difference, each control parameter can be adjusted in a small range according to a productivity test.
The invention provides a control method of a wet screening dry crushing sand manufacturing process of a fine crushing workshop in machine-made sand, which realizes intelligent control of process flow parameters, the doped aggregate is weighed by a metering tape machine, the water amount for doping is controlled by a flow valve, the water-sand blending proportion can be effectively controlled, the optimal range is controlled, and the optimal dewatering and desliming effects are obtained. The aggregate moisture content is monitored in real time, the follow-up superfine crushing efficiency and quality are ensured, and the processing requirement of high-quality machine-made gravels is met. The conveying capacity of each level of receiving adhesive tape machine after one screen is monitored, the running condition of the screening equipment and the quality of the intermediate product are judged, and the monitoring is carried out in real time to timely handle abnormal conditions. By monitoring the overflow concentration of the sand washer, the proportion of the material source to the blending water is indirectly judged, the control effect of blending water and sand is improved, the overflow height is controlled, the beneficial effect of minimum silt carrying capacity is obtained under the condition that the desliming effect meets the operation requirement, and the subsequent silt content regulation and control cost can be reduced. The control parameters are adjusted in a small range according to the productivity test to eliminate the quality difference of different mine raw materials.
Claims (7)
1. A control method for a wet screening and dry crushing sand process of a fine crushing workshop in machine-made sand is characterized by comprising the following steps: conveying crushed aggregates from a medium and fine crushing workshop to a water-sand mixer to mix with water, then conveying the aggregates to each part of the workshop through a screen by a metering adhesive tape machine, arranging a moisture content detector on the metering adhesive tape machine, arranging a flow valve on a water inlet pipe of the water-sand mixer, presetting a mass ratio control range, a moisture content control range and an intelligent control table of water-sand mixing in a control system of an intelligent control center, acquiring weighing and moisture content data of the metering adhesive tape machine in real time, controlling water supply flow of the flow valve according to the mass ratio of the water to the sand, wherein the mass ratio control range of the water to the sand is 35-40%, and when the mass ratio of the water to the sand exceeds the control range, carrying out early warning to inform personnel of processing; after the aggregates are sieved, the large aggregates with the particle size of more than 40mm are returned to a medium-sized or fine-ground adjusting bin through a first metering adhesive tape machine; the medium aggregate with the particle size of more than or equal to 5mm and less than or equal to 40mm is conveyed to a superfine adjusting bin through a second metering adhesive tape machine; conveying the fine aggregate with the particle size smaller than 5mm to a spiral sand washer, and conveying the fine aggregate to a fine aggregate blending workshop or a rod mill workshop through a third metering adhesive tape machine; the weight ratio of the conveying amount of the large aggregate and the medium aggregate to the total feeding amount and the control range of the weight ratio are preset in a control system of an intelligent control center respectively, the weight ratio of the large aggregate and the medium aggregate is calculated by weighing the large aggregate and the medium aggregate through a first metering adhesive tape machine and a second metering adhesive tape machine in real time, and when the weight ratio exceeds the control range, early warning is carried out according to an intelligent control table; and judging whether the water content exceeds the standard in real time, controlling the water content of the aggregate in a preset control range of < 3% in a control system of the intelligent control center, controlling a flow valve to reduce the water supply amount until the water content is less than 3% when the water content of the aggregate in monitoring is more than or equal to 3%, and giving an early warning to inform personnel to process when the water supply amount is reduced to the lower limit of the water-sand mass ratio and the water content is still higher than 3%.
2. The control method of the wet screening dry crushing sand process of the fine crushing workshop in the machine-made sand as claimed in claim 1, characterized in that: when the weight ratio of the large aggregate to the total feeding quantity is higher than the upper limit of a control range, the early warning item is sieve pore blockage or insufficient exciting force; and when the weight ratio of the large aggregate to the total feeding quantity is lower than the lower limit of the control range, the early warning item is sieve mesh abrasion or breakage and leakage.
3. The method for controlling the wet screening and dry crushing process of the fine crushing workshop in the machine-made sand as claimed in any one of claims 1 or 2, wherein the method comprises the following steps: the control range of the weight ratio of the large aggregate to the total feeding amount is +/-3%.
4. The control method of the wet screening dry crushing sand process of the fine crushing workshop in the machine-made sand as claimed in claim 1, characterized in that: when the weight ratio of the medium aggregate to the total feeding amount is higher than the upper limit of the control range, the early warning items are wear of the upper-layer sieve holes or material leakage caused by breakage or hole plugging of the sieve screen of the layer; and when the weight ratio of the medium aggregate to the total feeding quantity is lower than the lower limit of the control range, the early warning item is that the upper-layer screen is blocked or the screen on the layer is worn or broken to leak.
5. The method for controlling the wet screening and dry crushing process of the fine crushing workshop in the machine-made sand as claimed in any one of claims 1 or 4, wherein the method comprises the following steps: the control range of the weight ratio of the medium aggregate to the total feeding amount is +/-3%.
6. The control method of the wet screening dry crushing sand process of the fine crushing workshop in the machine-made sand as claimed in claim 1, characterized in that: the method comprises the following steps that an overflow height control valve and a concentration meter are arranged in a spiral sand washer, the flowing water concentration and overflow amount of the spiral sand washer and a control range of the flowing water concentration and overflow amount are preset in a control system of an intelligent control center, and when the conveying amount of wet sand cleaned by the spiral sand washer is increased, so that the water content of the wet sand is increased, the overflow amount is reduced, and the flowing water concentration is reduced and exceeds the control range, the overflow height of the sand washer is over-high, and the desliming condition is poor; when the wet sand conveying amount is reduced, the moisture content of the wet sand is reduced, the overflow amount is increased, and the flowing water concentration is increased to exceed the control range, the early warning sand washer has the defects of low overflow height and poor desliming condition.
7. The control method of the wet screening dry crushing sand process of the fine crushing workshop in the machine-made sand as claimed in claim 6, characterized in that: the control range of the wet sand conveying amount is +/-3%, the control range of the wet sand water content is +/-2%, the control range of the flowing water concentration of the spiral sand washer is +/-1%, and the control range of the overflow amount is +/-3%.
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| CN116037295A (en) * | 2023-02-14 | 2023-05-02 | 中国电建集团成都勘测设计研究院有限公司 | Method for removing mica in machine-made sand by wet method |
| CN117380011B (en) * | 2023-10-20 | 2024-04-30 | 云南凯瑞特工程机械设备有限公司 | Machine-made sand production system |
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| CN207832667U (en) * | 2018-01-16 | 2018-09-07 | 成都建工赛利混凝土有限公司 | A kind of water content ratio of aggregate automated watch-keeping facility |
| CN112892814A (en) * | 2020-12-24 | 2021-06-04 | 中国水利水电第九工程局有限公司 | Pneumatic powder removing process in manual sand making process |
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