CN116060192A - Product proportion control method and device based on sand and stone co-production process - Google Patents
Product proportion control method and device based on sand and stone co-production process Download PDFInfo
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- CN116060192A CN116060192A CN202310202943.1A CN202310202943A CN116060192A CN 116060192 A CN116060192 A CN 116060192A CN 202310202943 A CN202310202943 A CN 202310202943A CN 116060192 A CN116060192 A CN 116060192A
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
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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
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/04—Control arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to the technical field of automatic control, in particular to a product proportion control method and device based on a sand and stone co-production process, wherein the method comprises the following steps: finely crushing and shaping the semi-finished product material to obtain a first material; performing first powder selection on the first material, and sieving to obtain dust and first to fifth specification materials; processing the first specification materials, dividing the flow direction of the other specification materials into two paths, wherein the first path enters an overflow type storage bin, the second path is transported to a finished product output system or is processed, the first specification materials and the second path are mixed to generate a sixth specification material, and the sixth specification material is subjected to second powder selection and water adding and stirring; and weighing materials of each specification of the finished product output system in real time, and controlling the electro-hydraulic material distributing device to adjust the production proportion of the materials of each specification according to the weighing result. Based on the method, the closed-loop automatic control of the product proportion is realized, and various indexes of the finished product materials are stabilized.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a product proportion control method and device based on a sand and stone co-production process.
Background
The preparation of engineering concrete is one of the most main uses of machine-made sand, whether the quality of the concrete reaches the standard, whether the performance is stable or not, and the concrete is closely related to the quality of the machine-made sand, wherein reasonable classification has important significance for recycling tunnel slag, and according to the principle of classifying and applying the tunnel slag, the part with the strength of more than or equal to 60MPa can be used for preparing the machine-made sand.
In the related art, although specific requirements are made on the hole slag performance for machine-made sand production, the tunnel hole slag lithology has large fluctuation, and on the one hand, the process adaptability and the equipment stability are greatly influenced; more importantly, the quality of the finished product frequently fluctuates along with the characteristics of the raw materials, so that the stability is difficult to maintain, and the engineering application is not facilitated.
Therefore, a product proportion control method based on a sand and stone co-production process is needed, when machine-made sand is prepared by adopting tunnel hole slag, the quality of a finished product is ensured under the condition that the rock characteristics are frequently changed, closed-loop automatic control of the product proportion is realized, and various indexes of the finished product material are stabilized.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, a first object of the present invention is to provide a product ratio control method based on a sand and stone co-production process, so as to realize closed-loop automatic control of product ratio and stabilize various indexes of finished materials.
The second aim of the invention is to provide a product proportion control device based on a sand and stone co-production process.
In order to achieve the above object, an embodiment of the first aspect of the present invention provides a method for controlling a product ratio based on a sand co-production process, including:
feeding the semi-finished product materials into a constant-speed vertical shaft type impact crusher through an overflow type bin for fine crushing and shaping to produce a first material, wherein the overflow type bin is divided into a right bin and a left bin, and the constant-speed vertical shaft type impact crusher is provided with an overflow type feed inlet and a stone cavity;
the first material is subjected to first powder selection through a conveying device and a feeder, and then screening is performed to obtain dust, a first-specification material, a second-specification material, a third-specification material, a fourth-specification material and a fifth-specification material;
recycling coarse particles from dust through a powder sand separation device, processing the first specification material, dividing the flow directions of the second specification material, the third specification material, the fourth specification material and the fifth specification material into two paths through an electro-hydraulic material separation device, enabling the first path to enter an overflow type storage bin, enabling the second path to be transported to a finished product output system or processed, mixing the coarse particles, the first specification material and the second specification material to generate a sixth specification material, selecting the powder for the second specification material, and adding water to stir;
and weighing the materials of each specification transported to the finished product output system in real time, and controlling the electro-hydraulic material distribution device to adjust the production proportion of the materials of each specification according to the real-time weighing result, wherein the controlling of the electro-hydraulic material distribution device adjusts the production proportion of the materials of each specification, comprises triggering and stopping controlling the proportion of products through a product proportion adjusting threshold value, and controlling discharging or returning through adjusting a stepping angle preset value.
Optionally, in an embodiment of the present invention, weighing each specification material transported to the product output system in real time includes:
and configuring pressure sensing belt scales at the output ends of the sixth specification material, the third specification material, the fourth specification material and the fifth specification material, and acquiring real-time flow and accumulated weight of each specification material through the pressure sensing belt scales.
Optionally, in the embodiment of the present invention, the method for adjusting the production ratio of each specification material includes:
when the coarse particle ratio is larger than the target specification material ratio, adjusting the production proportion;
the adjustment sequence is sequentially carried out from large grain diameter to small grain diameter;
when the current duty ratio of the material with the specification to be adjusted is larger than the duty ratio of the material with the specification to be adjusted, adjusting the production proportion;
and when the overturning angle of the material distributing turning plate of the electro-hydraulic material distributing device does not reach a preset angle threshold, continuing to adjust the production proportion.
Optionally, in an embodiment of the present invention, triggering and stopping control of the product ratio by the product ratio adjustment threshold includes:
setting a product ratio adjustment trigger thresholdZ；
Collecting the weighing duty ratio of broken stone to the accumulated yield of finished productsc n Target duty cycle of crushed stone to cumulative yield of finished productc n,0 ；
If it is
，nThe production ratio of the materials with different specifications is triggered by the conditions of (1), (2) and (3), if +.>
，nAnd (3) and (1) and (2) and (3) stopping adjusting the production proportion of the materials with various specifications.
Optionally, in an embodiment of the present invention, controlling the discharging or returning by adjusting the preset value of the stepping angle includes:
setting the absolute angle position of the electro-hydraulic component device and singly adjusting the preset value of the stepping angle;
if the preset value of the single adjustment stepping angle is larger than 0, the material returning quantity is increased;
if the preset value of the single adjustment stepping angle is smaller than 0, the discharge amount is increased.
Optionally, in an embodiment of the present invention, the method for selecting the first powder includes:
the first powder selection is carried out through a wind power powder selecting machine, wherein the wind power powder selecting machine adopts a mode of positive pressure and negative pressure, the positive pressure is the blowing of a self-contained fan into the machine body, and the negative pressure is the suction of a dust remover fan out of the machine body.
Optionally, in the embodiment of the present invention, the first material first performs first powder selection through the conveying device and the feeder, and then performs screening to obtain a first specification material, a second specification material, a third specification material, a fourth specification material and a fifth specification material, where the steps include:
four layers of screens with different specifications are arranged when screening is carried out, so that the first material after passing through the first powder selecting is screened out into a first specification material, a second specification material, a third specification material, a fourth specification material and a fifth specification material.
Optionally, in an embodiment of the present invention, the transporting the second path to the finished product output system or the processing further includes:
uniformly feeding the second specification materials and the third specification materials entering the right bin of the overflow type bin into a high-speed vertical shaft type impact crusher by a feeder for processing;
when the high-speed vertical shaft type impact crusher is not timely processed or the processing capacity cannot be met, the right half part of the overflow type storage bin can enter the left storage bin of the overflow type storage bin through the overflow port after being fully filled, and the left storage bin is processed by the constant-speed vertical shaft type impact crusher.
In order to achieve the above object, an embodiment of a second aspect of the present invention provides a product ratio control apparatus based on a sand and stone co-production process, including:
the fine crushing shaping module is used for conveying the semi-finished product materials into a constant-speed vertical shaft type impact crusher through an overflow type bin for fine crushing shaping to produce a first material, wherein the overflow type bin is divided into a right bin and a left bin, and the constant-speed vertical shaft type impact crusher is provided with an overflow type feed inlet and a stone crushing cavity;
the screening module is used for carrying out first powder selection on the first material through the conveying equipment and the feeder, and then screening to obtain a first-specification material, a second-specification material, a third-specification material, a fourth-specification material and a fifth-specification material;
the processing module is used for processing the first specification materials, dividing the flow directions of the second specification materials, the third specification materials, the fourth specification materials and the fifth specification materials into two paths through the electro-hydraulic material dividing device, enabling the first path to enter the overflow type storage bin, enabling the second path to be transported to a finished product output system or processed, enabling the first specification materials and the second path to be mixed to generate a sixth specification materials, enabling the sixth specification materials to be subjected to second powder selecting, and adding water to stir;
the product proportion adjusting module is used for weighing all the materials in all the specifications transported to the finished product output system in real time, controlling the electro-hydraulic material distributing device to adjust the production proportion of the materials in all the specifications according to the real-time weighing result, wherein controlling the electro-hydraulic material distributing device to adjust the production proportion of the materials in all the specifications comprises triggering and stopping controlling the product proportion through a product proportion adjusting threshold value, and controlling discharging or returning through adjusting a stepping angle preset value.
In summary, the embodiment of the invention provides a product proportion control method and device based on a sand and stone co-production process, which is characterized in that semi-finished materials are sent into a constant-speed vertical shaft type impact crusher through an overflow type bin for fine crushing and shaping, dust, a first specification material, a second specification material, a third specification material, a fourth specification material, a fifth specification material and a sixth specification material are obtained through screening treatment steps, coarse particles are recovered from the dust through a powder-sand separation device, the first specification material is treated, the flow directions of the second specification material, the third specification material, the fourth specification material and the fifth specification material are divided into two paths through an electro-hydraulic material dividing device, finally, all specification materials transported to a finished product output system are weighed in real time, and the electro-hydraulic material dividing device is controlled to adjust the production proportion of all specification materials according to real-time weighing results. Based on the method, the closed-loop automatic control of the product proportion can be realized, and various indexes of the finished product materials are stabilized.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic flow chart of a method for controlling the product ratio based on a sand co-production process according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the ratio distribution of different specifications of products according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a product ratio control device based on a sand and stone co-production process according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method for controlling the product ratio based on a sand co-production process according to an embodiment of the present invention;
reference numerals illustrate:
100-fine crushing shaping module; 200-a screening module; 300-a processing module; 400-product ratio adjustment module.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes a product ratio control method and device based on a sand co-production process according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a product ratio control method based on a sand and stone co-production process according to an embodiment of the invention.
As shown in fig. 1, the product ratio control method based on the sand and stone co-production process comprises the following steps:
step S10: the semi-finished product materials enter a constant-speed vertical shaft type impact crusher through an overflow type bin for fine crushing and shaping, and a first material is produced, wherein the overflow type bin is divided into a right bin and a left bin, and the constant-speed vertical shaft type impact crusher is provided with an overflow type feed inlet and a stone cavity.
Wherein, the constant-speed vertical shaft impact crusher can be simply called constant-speed vertical shaft crusher. The impact speed of the material in the constant-speed vertical shaft crusher is generally 45-60 m/s.
Step S20: the first material is subjected to first powder selection through the conveying equipment and the feeder, and then is screened to obtain dust, a first specification material, a second specification material, a third specification material, a fourth specification material and a fifth specification material.
In one embodiment of the present invention, the method for selecting the first powder includes:
the first powder selection is carried out through a wind power powder selecting machine, wherein the wind power powder selecting machine adopts a mode of positive pressure and negative pressure, the positive pressure is the blowing of a self-contained fan into the machine body, and the negative pressure is the suction of a dust remover fan out of the machine body.
In an embodiment of the present invention, the first material first selecting powder by the transporting device and the feeder, and then sieving to obtain a first specification material, a second specification material, a third specification material, a fourth specification material and a fifth specification material includes:
four layers of screens with different specifications are arranged when screening is performed, so that the first material passing through the first powder selecting process is screened out into a first specification material, a second specification material, a third specification material, a fourth specification material and a fifth specification material.
Step S30: the dust is recovered into coarse particles through a powder sand separation device, the first specification material is processed, the flow directions of the second specification material, the third specification material, the fourth specification material and the fifth specification material are divided into two paths through an electro-hydraulic material dividing device, wherein the first path enters an overflow type storage bin, the second path is transported to a finished product output system or is processed, the coarse particles, the first specification material and the second specification material are mixed to generate a sixth specification material, the sixth specification material is subjected to second powder selecting, and water adding and stirring are performed.
Wherein, in the embodiment of the invention, the second path is transported to a finished product output system or is processed, and further comprises:
uniformly feeding the second specification materials and the third specification materials which enter the right bin of the overflow type bin into a high-speed vertical shaft type impact crusher by a feeder for processing;
when the high-speed vertical shaft type impact crusher is not timely processed or the processing capacity cannot be met, the right half part of the overflow type storage bin can enter the left bin of the overflow type storage bin through the overflow port after being full, and the left bin is processed by the constant-speed vertical shaft type impact crusher.
Wherein, the high-speed vertical shaft impact crusher can be simply called as a high-speed vertical shaft crusher. The impact speed of the materials in the high-speed vertical shaft crusher is generally more than 60m/s.
Step S40: and weighing the materials of each specification transported to the finished product output system in real time, and controlling the electro-hydraulic material distribution device to adjust the production proportion of the materials of each specification according to the real-time weighing result, wherein controlling the electro-hydraulic material distribution device to adjust the production proportion of the materials of each specification comprises triggering and stopping controlling the proportion of products through a threshold value for adjusting the proportion of the products, and controlling discharging or returning materials through adjusting a preset value of the stepping angle.
In the embodiment of the invention, each specification material transported to the finished product output system is weighed in real time, and the method comprises the following steps:
and configuring pressure sensing belt scales at the output ends of the sixth specification material, the third specification material, the fourth specification material and the fifth specification material, and acquiring real-time flow and accumulated weight of each specification material through the pressure sensing belt scales.
In an embodiment of the present invention, the method for adjusting the production ratio of each specification material includes:
when the coarse particle ratio is larger than the target specification material ratio, adjusting the production proportion;
the adjustment sequence is sequentially carried out from large grain diameter to small grain diameter;
when the current ratio of the material with the specification to be adjusted is larger than the target material with the specification, adjusting the production proportion;
when the overturning angle of the material distributing turning plate of the electro-hydraulic material distributing device does not reach the preset angle threshold, the production proportion is continuously adjusted. Wherein the preset angle threshold is +45° and-45 °.
Further, in an embodiment of the present invention, triggering and stopping control of the product ratio by the product ratio adjustment threshold includes:
setting a product ratio adjustment trigger thresholdZ；
Collecting the weighing duty ratio of broken stone to the accumulated yield of finished productsc n Target duty cycle of crushed stone to cumulative yield of finished productc n,0 ；
If it is
，nWhen =1, 2, 3, the production ratio of the materials with different specifications is triggered to be adjusted, if +.>
，n=1, 2, 3, thenStopping adjusting the production proportion of the materials with different specifications.
Further, in an embodiment of the present invention, controlling the discharging or returning by adjusting the preset value of the stepping angle includes:
setting the absolute angle position of the electro-hydraulic component device and singly adjusting the preset value of the stepping angle;
if the preset value of the single adjustment stepping angle is larger than 0, the material returning quantity is increased;
if the preset value of the single adjustment stepping angle is smaller than 0, the discharge amount is increased.
In the embodiment of the present invention, regarding the adjustment of the production ratio, at the beginning of the production (i.e., the production time does not exceed 1 hour), since the cumulative yield is small and the fluctuation of the production ratio is large, the minimum interval time between the adjustment of the production ratio should be appropriately increased at two times, for example, may be once every 30 minutes, and after the production is gradually stabilized (i.e., the production time exceeds 1 hour), the minimum interval time between the adjustment of the production ratio should be appropriately decreased at 10 minutes.
For example, in the embodiment of the invention, the trigger threshold value for adjusting the proportion of the product is set to be 1%, and the weighing proportion of 20mm-31.5mm, 10mm-20mm and 5mm-10mm broken stones to the accumulated output of the finished product is respectively collectedc 1 、c 2 、c 3 And collecting target duty ratio of 20mm-31.5mm, 10mm-20mm, 5mm-10mm crushed stones to accumulated yield of finished products respectivelyc 1,0 、c 2,0 、c 3,0 . In addition, the weighing duty cycle (also referred to as the product duty cycle)c n And weighing the resultP n The following relationship is provided:
P k in order to accumulate the weighing result,kwhen=1P 1 Cumulative weighing result of 20mm-31.5mm crushed stone;kwhen=2P 2 The accumulated weighing result of the crushed stones with the diameter of 10mm to 20mm is obtained;kwhen=3P 3 The accumulated weighing result of 5mm-10mm broken stones;kwhen=4P 4 The accumulated weighing result of the machine-made sand is 0mm-5 mm.
Thereafter, the adjustment of the preset stepping angle value is started, wherein the absolute angle position of the electro-hydraulic component device
The preset value of the single step angle is +.>
.20 mm-31.5mm, 10mm-20mm, 5mm-10mm rubble correspond to the No. 1, no. 2, no. 3 electro-hydraulic pressure component device respectively, and absolute angle positions are +.>
The method comprises the steps of carrying out a first treatment on the surface of the If the preset value of the single adjustment step angle is greater than 0 (i.e.)>
) The return material amount is increased when the single adjustment step angle preset value is smaller than 0 (i.e.)>
) And the discharge amount is increased.
Based on the above, in order to verify the product proportion control method based on the sand and stone co-production process, a section of product proportion adjustment result is randomly selected for analysis, the product proportion monitoring result is extracted for 1 hour, the monitoring result is shown in table 1, and the distribution situation is shown in fig. 2.
Table 1 table of product ratio monitoring data for each specification
FIG. 2 is a schematic diagram showing the ratio distribution of products of different specifications according to an embodiment of the present invention. As shown in FIG. 2, the product proportion distribution conditions of 20mm-31.5mm, 10mm-20mm, 5mm-10mm and 0mm-5mm are shown, wherein the product proportion distribution conditions of five hours are selected, the interval time is 1 hour, wherein the product proportion of 0mm-5mm is stabilized at about 10%, the product proportion (namely the product ratio) of 5mm-10mm is stabilized at about 15%, the product proportion of 10mm-20mm is stabilized at about 25%, and the product proportion of 20mm-31.5mm is stabilized at about 50%. Based on the method, the closed-loop automatic control of the product proportion is realized, and various indexes of the finished product materials are stabilized.
Based on the above, after the belt conveyor weighing starts, the trigger condition and/or the stop condition of the product proportion adjustment are determined, if the trigger condition is the trigger condition, the next step of adjusting the step-in angle preset value is performed, and if the stop condition is the stop condition, the belt conveyor weighing is resumed. When the preset value of the stepping angle is adjusted, the absolute angle position of the electro-hydraulic component device needs to be judged, and when the angle is at
Step angle preset value is adjusted for a single time>
The proportion adjustment of materials with corresponding specifications is controlled by adjusting the preset value of the stepping angle>
When the return amount is increased, the weight is increased>
And the discharge amount is increased. After adjusting the preset value of the step angle, it is necessary to wait 5 minutes so that the device can adapt to the parameters after adjustment.
In summary, the embodiment of the invention provides a product proportion control method based on a sand and stone co-production process, which is characterized in that semi-finished materials are sent into a constant-speed vertical shaft type impact crusher through an overflow type storage bin to be finely crushed and shaped, dust, a first specification material, a second specification material, a third specification material, a fourth specification material, a fifth specification material and a sixth specification material are obtained through screening treatment steps, coarse particles are recovered from the dust through a powder-sand separation device, the first specification material is treated, the flow directions of the second specification material, the third specification material, the fourth specification material and the fifth specification material are divided into two paths through an electro-hydraulic material dividing device, finally, all specification materials transported to a finished product output system are weighed in real time, and the electro-hydraulic material dividing device is controlled to adjust the production proportion of all specification materials according to real-time weighing results. Based on the method, the closed-loop automatic control of the product proportion can be realized, and various indexes of the finished product materials are stabilized.
Fig. 3 is a schematic structural diagram of a product ratio control device based on a sand and stone co-production process according to an embodiment of the present invention.
As shown in fig. 3, the product ratio control device based on the sand co-production process comprises:
the fine crushing shaping module 100 is used for conveying the semi-finished product materials into a constant-speed vertical shaft type impact crusher for fine crushing shaping through an overflow type bin to produce a first material, wherein the overflow type bin is divided into a right bin and a left bin, and the constant-speed vertical shaft type impact crusher is provided with an overflow type feed inlet and a stone cavity;
the screening module 200 is configured to perform first powder selection on a first material through a conveying device and a feeder, and then screen the first material to obtain a first specification material, a second specification material, a third specification material, a fourth specification material and a fifth specification material;
the processing module 300 is configured to process the first specification material, divide the flow directions of the second specification material, the third specification material, the fourth specification material and the fifth specification material into two paths through the electro-hydraulic material dividing device, wherein the first path enters the overflow type storage bin, the second path is transported to the finished product output system or processed, the first specification material and the second path are mixed to generate a sixth specification material, and the sixth specification material is subjected to second powder selecting and water adding for stirring;
the product proportion adjusting module 400 is configured to weigh each specification material transported to the finished product output system in real time, and control the electro-hydraulic material distributing device to adjust the production proportion of each specification material according to the real-time weighing result, where controlling the electro-hydraulic material distributing device to adjust the production proportion of each specification material includes triggering and stopping controlling the product proportion by the product proportion adjusting threshold, and controlling the discharging or returning by adjusting the preset value of the stepping angle.
It should be noted that the foregoing explanation of the embodiment of the product ratio control method based on the sand and stone co-production process is also applicable to the apparatus of this embodiment, and reference may be made to the related description of the foregoing embodiment, which is not repeated herein.
In summary, the embodiment of the invention provides a product proportion control device based on a sand and stone co-production process, which is characterized in that semi-finished materials are sent into a constant-speed vertical shaft type impact crusher through an overflow type storage bin to be finely crushed and shaped, dust, a first specification material, a second specification material, a third specification material, a fourth specification material, a fifth specification material and a sixth specification material are obtained through screening treatment steps, coarse particles are recovered from the dust through a powder-sand separation device, the first specification material is treated, the flow directions of the second specification material, the third specification material, the fourth specification material and the fifth specification material are divided into two paths through an electro-hydraulic material dividing device, finally, all specification materials transported to a finished product output system are weighed in real time, and the electro-hydraulic material dividing device is controlled to adjust the production proportion of all specification materials according to real-time weighing results. Based on the method, closed-loop automatic control of the product proportion can be realized, and various indexes of the finished product materials are stabilized.
For a more clear explanation of the process of the present invention, an embodiment is specifically provided, please refer to fig. 4. Fig. 4 is a flow chart of a product ratio control method based on a sand co-production process according to an embodiment of the present invention.
As shown in fig. 4, at the leftmost side of the graph 4, clean semi-finished product materials with qualified particle size (less than or equal to 32 mm), namely raw materials with the particle size of 0mm-32mm, are fed into a constant-speed vertical shaft impact crusher (called constant-speed vertical shaft crusher for short) through an overflow bin (left half part) to be finely crushed and shaped, wherein the constant-speed vertical shaft crusher is provided with an overflow type feed inlet and a stone crushing cavity, and the impact speed is about 45 m/s-60 m/s. After passing through the conveying equipment (the speed-regulating or constant-speed belt feeder, the vertical elevator or other conveying equipment) and the feeder, the mixed material enters the wind powder selecting machine for first powder selecting. The wind powder selecting machine adopts a mode of positive pressure and negative pressure, wherein the positive pressure is the blowing of a self-contained fan into the machine body, and the negative pressure is the suction of a dust remover fan out of the machine body.
In the upper right of the figure 4, the mixed material after the first powder selection enters a vibrating screen for screening, and five specification products (also called five specification materials) of 0 mm-2.5 mm, 2.5 mm-5mm, 5mm-10mm, 10mm-20mm and 20mm-31.5mm can be obtained. The vibrating screen is provided with four layers of screens of 2.5mm, 5mm, 10mm and 20 mm.
And then, the discharging positions of the products with four specifications of 2.5 mm-5mm, 5mm-10mm, 10mm-20mm and 20mm-31.5mm are provided with electro-hydraulic material dividing devices, the flow direction of each material is divided into two paths, the 1 st path enters an overflow type storage bin, and the 2 nd path is used as a finished product to be output or subjected to subsequent treatment. The product with the length of 10mm to 20mm in the 1 st path and the product with the length of 20mm to 31.5mm in the 1 st path enter an overflow type storage bin (left half part), wherein the product with the length of 10mm to 20mm in the 1 st path and the product with the length of 20mm to 31.5mm in the 1 st path are called as return materials with the length of 10mm to 32mm, and the return materials with the length of 10mm to 32mm are broken by a constant-speed vertical shaft; the 1 st path of products with the length of 2.5mm to 5mm and the 1 st path of products with the length of 5mm to 10mm enter an overflow type bin (right half part), wherein the 1 st path of products with the length of 2.5mm to 5mm and the 1 st path of products with the length of 5mm to 10mm are called as 2.5mm to 10mm return materials, and the 2.5mm to 10mm return materials are processed by a high-speed vertical shaft breaking. The products of the 2 nd path, 5mm-10mm, 10mm-20mm and 20mm-31.5mm, are directly used as finished products (such as fine crushed stones) and output through a pressure sensing belt scale (a finished product output system); and (3) feeding the product with the specification of 0 mm-2.5 mm and the product with the specification of 2 nd path of 2.5 mm-5mm from the vibrating screen into a fineness modulus adjusting system for processing. The fineness modulus adjusting system comprises a speed-adjusting belt feeder and a constant-speed belt feeder, the product processed by the fineness modulus adjusting system enters a gravity powder concentrator for secondary powder concentration, the product output by the gravity powder concentrator enters a wet mixer for adding water and stirring to obtain a finished product (such as fine sand), and then the finished product is transported to a finished product output system, wherein an image granularity analyzer can be utilized for analyzing the finished product in the transportation process.
Finally, weighing all the materials in all the specifications transported to the finished product output system in real time, and controlling the electro-hydraulic material distribution device to adjust the production proportion of the materials in all the specifications according to the real-time weighing result, wherein controlling the electro-hydraulic material distribution device to adjust the production proportion of the materials in all the specifications comprises triggering and stopping controlling the proportion of products through a product proportion adjusting threshold value, and controlling discharging or returning through adjusting a stepping angle preset value.
In addition, as shown in fig. 4, the dust output after the powder selection by the wind powder selector and the gravity powder selector can be processed by a powder-sand separation device, the products with the fineness modulus of more than or equal to 0.75mm in the processed products are input into a fineness modulus adjusting system again for processing, the rest products are sent to a dust remover for processing, and the dust processed by the dust remover is sent to a dust storage tank for storage, and the dust in the dust storage tank can be transported to other places by a transport vehicle.
In the description of the present specification, reference to the term "example" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., may be considered a ordered listing of executable instructions for implementing logical functions, can be embodied in any non-transitory computer-readable storage medium (e.g., computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions), or can be used in conjunction with the instruction execution system, apparatus, or device.
The non-transitory computer readable storage medium of the present invention has a computer program stored thereon that when executed by a processor implements a method of controlling product ratio based on a sand co-production process. In particular, for the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. The product proportion control method based on the sand and stone co-production process is characterized by comprising the following steps of:
feeding the semi-finished product materials into a constant-speed vertical shaft type impact crusher through an overflow type bin for fine crushing and shaping to produce a first material, wherein the overflow type bin is divided into a right bin and a left bin, and the constant-speed vertical shaft type impact crusher is provided with an overflow type feed inlet and a stone cavity;
the first material is subjected to first powder selection through a conveying device and a feeder, and then screening is performed to obtain dust, a first-specification material, a second-specification material, a third-specification material, a fourth-specification material and a fifth-specification material;
recycling coarse particles from dust through a powder sand separation device, processing the first specification material, dividing the flow directions of the second specification material, the third specification material, the fourth specification material and the fifth specification material into two paths through an electro-hydraulic material separation device, enabling the first path to enter an overflow type storage bin, enabling the second path to be transported to a finished product output system or processed, mixing the coarse particles, the first specification material and the second specification material to generate a sixth specification material, selecting the powder for the second specification material, and adding water to stir;
and weighing the materials of each specification transported to the finished product output system in real time, and controlling the electro-hydraulic material distribution device to adjust the production proportion of the materials of each specification according to the real-time weighing result, wherein the controlling of the electro-hydraulic material distribution device adjusts the production proportion of the materials of each specification, comprises triggering and stopping controlling the proportion of products through a product proportion adjusting threshold value, and controlling discharging or returning through adjusting a stepping angle preset value.
2. The control method according to claim 1, wherein weighing each specification material transported to the finished product output system in real time comprises:
and configuring pressure sensing belt scales at the output ends of the sixth specification material, the third specification material, the fourth specification material and the fifth specification material, and acquiring real-time flow and accumulated weight of each specification material through the pressure sensing belt scales.
3. The control method according to claim 1, wherein the method for adjusting the production ratio of each specification material comprises:
when the coarse particle ratio is larger than the target specification material ratio, adjusting the production proportion;
the adjustment sequence is sequentially carried out from large grain diameter to small grain diameter;
when the current duty ratio of the material with the specification to be adjusted is larger than the duty ratio of the material with the specification to be adjusted, adjusting the production proportion;
and when the overturning angle of the material distributing turning plate of the electro-hydraulic material distributing device does not reach a preset angle threshold, continuing to adjust the production proportion.
4. The control method according to claim 1, wherein triggering and stopping control of the product ratio by the product ratio adjustment threshold comprises:
setting a product ratio adjustment trigger thresholdZ；
Collecting the weighing duty ratio of broken stone to the accumulated yield of finished productsc n Target duty cycle of crushed stone to cumulative yield of finished productc n,0 ；
If it is
，nThe production ratio of the materials with different specifications is triggered by the conditions of (1), (2) and (3), if +.>
，nAnd (3) and (1) and (2) and (3) stopping adjusting the production proportion of the materials with various specifications.
5. The control method according to claim 4, wherein the control of the discharge or return by adjusting the preset value of the stepping angle comprises:
setting the absolute angle position of the electro-hydraulic component device and singly adjusting the preset value of the stepping angle;
if the preset value of the single adjustment stepping angle is larger than 0, the material returning quantity is increased;
if the preset value of the single adjustment stepping angle is smaller than 0, the discharge amount is increased.
6. The control method according to any one of claims 1 to 5, characterized in that the method of the first powder selection comprises:
the first powder selection is carried out through a wind power powder selecting machine, wherein the wind power powder selecting machine adopts a mode of positive pressure and negative pressure, the positive pressure is the blowing of a self-contained fan into the machine body, and the negative pressure is the suction of a dust remover fan out of the machine body.
7. The control method according to any one of claims 1 to 5, wherein the first material is subjected to first powder selection by a conveying device and a feeder, and then is subjected to sieving to obtain a first-size material, a second-size material, a third-size material, a fourth-size material and a fifth-size material, which comprises:
four layers of screens with different specifications are arranged when screening is carried out, so that the first material after passing through the first powder selecting is screened out into a first specification material, a second specification material, a third specification material, a fourth specification material and a fifth specification material.
8. The control method of any one of claims 1-5, wherein the second pass is transported to a finished product output system or processed, further comprising:
uniformly feeding the second specification materials and the third specification materials entering the right bin of the overflow type bin into a high-speed vertical shaft type impact crusher by a feeder for processing;
when the high-speed vertical shaft type impact crusher is not timely processed or the processing capacity cannot be met, the right half part of the overflow type storage bin can enter the left storage bin of the overflow type storage bin through the overflow port after being fully filled, and the left storage bin is processed by the constant-speed vertical shaft type impact crusher.
9. A product proportion control device based on grit coproduction technology, characterized by comprising:
the fine crushing shaping module is used for conveying the semi-finished product materials into a constant-speed vertical shaft type impact crusher through an overflow type bin for fine crushing shaping to produce a first material, wherein the overflow type bin is divided into a right bin and a left bin, and the constant-speed vertical shaft type impact crusher is provided with an overflow type feed inlet and a stone crushing cavity;
the screening module is used for carrying out first powder selection on the first material through the conveying equipment and the feeder, and then screening to obtain a first-specification material, a second-specification material, a third-specification material, a fourth-specification material and a fifth-specification material;
the processing module is used for processing the first specification materials, dividing the flow directions of the second specification materials, the third specification materials, the fourth specification materials and the fifth specification materials into two paths through the electro-hydraulic material dividing device, enabling the first path to enter the overflow type storage bin, enabling the second path to be transported to a finished product output system or processed, enabling the first specification materials and the second path to be mixed to generate a sixth specification materials, enabling the sixth specification materials to be subjected to second powder selecting, and adding water to stir;
the product proportion adjusting module is used for weighing all the materials in all the specifications transported to the finished product output system in real time, controlling the electro-hydraulic material distributing device to adjust the production proportion of the materials in all the specifications according to the real-time weighing result, wherein controlling the electro-hydraulic material distributing device to adjust the production proportion of the materials in all the specifications comprises triggering and stopping controlling the product proportion through a product proportion adjusting threshold value, and controlling discharging or returning through adjusting a stepping angle preset value.
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07116542A (en) * | 1993-10-26 | 1995-05-09 | Kurimoto Ltd | Wet type sand producing equipment having function to control grain size of sand product and its control method |
| JP2002282790A (en) * | 2001-03-26 | 2002-10-02 | Kurimoto Ltd | Crushed sand manufacturing device |
| CN202700561U (en) * | 2012-07-26 | 2013-01-30 | 济南海川投资集团有限公司 | Proportioning-free system for prebaked anode material |
| CN205088190U (en) * | 2015-10-09 | 2016-03-16 | 河南晋开化工投资控股集团有限责任公司 | Gasifier feeder |
| CN107377170A (en) * | 2017-09-01 | 2017-11-24 | 中国水利水电第十六工程局有限公司 | Materials of man-made sand production system |
| CN207933284U (en) * | 2018-02-12 | 2018-10-02 | 贵州成智重工科技有限公司 | A kind of device for controlling product grain fineness number modulus |
| CN109013006A (en) * | 2018-08-02 | 2018-12-18 | 贵州成智重工科技有限公司 | A kind of double host crushing production lines and method based on frequency conversion control technique |
| CN109731661A (en) * | 2019-02-28 | 2019-05-10 | 贵州成智重工科技有限公司 | A kind of high-quality sandstone aggregate five is enjoyed a double blessing dry milling production line and processing method |
| CN110420850A (en) * | 2019-09-06 | 2019-11-08 | 贵州铁建科技发展有限公司 | The preparation method of Machine-made Sand and its negative pressure method Machine-made Sand multi-stage screening equipment used |
| CN211839005U (en) * | 2020-03-19 | 2020-11-03 | 安徽省建筑科学研究设计院 | A kind of mechanism sand grading adjustment device and production system |
| CN113262871A (en) * | 2021-06-28 | 2021-08-17 | 中国水利水电第九工程局有限公司 | Intelligent control method for balanced crushing of fine crushing workshop in machine-made gravel |
| CN113275119A (en) * | 2021-06-29 | 2021-08-20 | 中国水利水电第九工程局有限公司 | Online quality control preparation system of grit processing extra fine workshop |
| CN113694804A (en) * | 2021-08-24 | 2021-11-26 | 广东摩尔物联技术有限公司 | Method for automatically controlling feeding ratio of materials |
| CN115283124A (en) * | 2022-10-08 | 2022-11-04 | 中铁工程服务有限公司 | Method for controlling fineness modulus of machine-made sand |
-
2023
- 2023-03-06 CN CN202310202943.1A patent/CN116060192B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07116542A (en) * | 1993-10-26 | 1995-05-09 | Kurimoto Ltd | Wet type sand producing equipment having function to control grain size of sand product and its control method |
| JP2002282790A (en) * | 2001-03-26 | 2002-10-02 | Kurimoto Ltd | Crushed sand manufacturing device |
| CN202700561U (en) * | 2012-07-26 | 2013-01-30 | 济南海川投资集团有限公司 | Proportioning-free system for prebaked anode material |
| CN205088190U (en) * | 2015-10-09 | 2016-03-16 | 河南晋开化工投资控股集团有限责任公司 | Gasifier feeder |
| CN107377170A (en) * | 2017-09-01 | 2017-11-24 | 中国水利水电第十六工程局有限公司 | Materials of man-made sand production system |
| CN207933284U (en) * | 2018-02-12 | 2018-10-02 | 贵州成智重工科技有限公司 | A kind of device for controlling product grain fineness number modulus |
| CN109013006A (en) * | 2018-08-02 | 2018-12-18 | 贵州成智重工科技有限公司 | A kind of double host crushing production lines and method based on frequency conversion control technique |
| CN109731661A (en) * | 2019-02-28 | 2019-05-10 | 贵州成智重工科技有限公司 | A kind of high-quality sandstone aggregate five is enjoyed a double blessing dry milling production line and processing method |
| CN110420850A (en) * | 2019-09-06 | 2019-11-08 | 贵州铁建科技发展有限公司 | The preparation method of Machine-made Sand and its negative pressure method Machine-made Sand multi-stage screening equipment used |
| CN211839005U (en) * | 2020-03-19 | 2020-11-03 | 安徽省建筑科学研究设计院 | A kind of mechanism sand grading adjustment device and production system |
| CN113262871A (en) * | 2021-06-28 | 2021-08-17 | 中国水利水电第九工程局有限公司 | Intelligent control method for balanced crushing of fine crushing workshop in machine-made gravel |
| CN113275119A (en) * | 2021-06-29 | 2021-08-20 | 中国水利水电第九工程局有限公司 | Online quality control preparation system of grit processing extra fine workshop |
| CN113694804A (en) * | 2021-08-24 | 2021-11-26 | 广东摩尔物联技术有限公司 | Method for automatically controlling feeding ratio of materials |
| CN115283124A (en) * | 2022-10-08 | 2022-11-04 | 中铁工程服务有限公司 | Method for controlling fineness modulus of machine-made sand |
Non-Patent Citations (1)
| Title |
|---|
| 陈虎;覃信海;: "半干式制砂工艺在台山核电厂人工砂石骨料生产中的应用", 贵州水力发电, no. 03 * |
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