JP3235860B2 - Sand making control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sand control device,
More particularly, the present invention relates to a sand making control device capable of continuously measuring the grain size of a large amount of sand making, and therefore maintaining the grain size quality of sand making.

[0002]

2. Description of the Related Art Conventionally, a method for measuring the particle size of sand using human power and a sieve has been defined and implemented in JISA1102. In this method, twice a day, 500 times at a time
g of sand as a sample, and after drying it,
5mm, 2.5mm, 1.2mm, 0.6mm, 0.3
Each of the sieves having a sieve of 0.15 mm and 0.15 mm is sieved, and the weight of the sand remaining on each sieve is weighed to calculate the overall particle size distribution.

As another method of the above-mentioned conventional method, FIG.
FIG. 1 shows a schematic explanatory view of a method for measuring the particle size of sand from a sand production plant. As shown in this figure, in this manufacturing plant, a predetermined amount of raw material sand 3 is drawn from a raw material sand bin 1 by an adjustable vibrating feeder 2, supplied to a rod mill 5 by a belt conveyor 4, and By grinding with a rod 7, it is crushed into sand having a predetermined particle size. Then, the electromagnetic water supply valve 5a is opened while being adjusted, and the cleaning water 6 is supplied into the rod mill 5 to wash the crushed raw material sand 3, that is, the sand making 8, and then introduces it into the classifier 9. The classifier 9 separates the sand making 8 from mud and other impurities while scraping the sand making 8 having a desired particle size, and discharges the sand making 8 to the belt conveyor 4a. To the sand making stock. When transported by the belt conveyor 4a, a part of the sand making 8 is collected as a sample, brought into the test room 10 and dried, and then weighed and calculated by an operator, and the calculation result is described in a document or the like. The operator adjusts the frequency of the vibration feeder 2 or the opening / closing degree of the gate (not shown) of the raw material sand bin 1 based on the calculation result and controls the amount of raw material withdrawn, or has an electromagnetic valve based on the calculation result. The water supply valve 5a is adjusted to control the water supply amount of the washing water, thereby controlling the particle size quality of the sand production.

[0004] However, this conventional method has the drawback that the processing time per one time (500 g sample amount) exceeds one hour, and it takes time.

In addition, in the case of a construction requiring a large amount of sand, such as a dam construction, it is difficult to calculate the particle size distribution of the entire sand in terms of time. There were also disadvantages.

Therefore, recently, a typical method for automating and measuring the particle size distribution of sand production without requiring humans, for example, automatic measurement of sand particle size by a robot hand or automatic particle size measurement by image processing has been proposed. Has been implemented. In the automatic measurement of sand particle size by a robot hand, a manual operation is performed by the robot hand. FIG.
1A and 1B are a schematic front view and a plan view, respectively, of an automatic sand particle size measuring device by a robot hand. As shown in this figure, in the automatic sand particle weighing device 30 by the robot hand, when the sample sand making 8 is put into the sieving device 32 through the sample input port 31, the sieving device 32
Automatically sieving work and weighing with robot hand 33
Do. Thereafter, the robot hand 33 takes out the sieve (not shown), moves the sieve between the sieve holder 34, the sample holder 40, and the sieve cleaning mechanism 43, and performs cleaning of the sieve and setting for the next weighing. .

[0007]

However, in the above-described automatic sand particle weighing device using a robot hand, no labor is required, so that labor can be saved. The drying process takes time (for example, 10 minutes for a 20 g sample)
And the measurement time could not be reduced as a whole.

There is also a method for automatically measuring the particle size of sand by image processing. However, this method has a drawback that when sand particles overlap, a measurement error occurs, so that the particle size cannot be measured accurately and the particle size distribution cannot be calculated. Also, the image processing time for one image is
It takes 15 seconds or more, and is 50 stipulated in JISA1102.
It was difficult to measure a 0 g sample. In particular, 1
The number of particles that can be grasped in one image is about 100 or less, and 50
In order to determine the entirety of 0 g, there are many problems in the method of preparing the sample and the processing time.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to continuously measure the particle size of a large amount of sand in a short time and to quickly calculate the particle size distribution from the measured data. Accordingly, an object of the present invention is to provide a sand making control device capable of adjusting the grain size quality of sand making in response to a change with time.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned object, and the gist of the present invention is to grind raw material sand supplied into a rod mill, wash it with washing water, and then wash the sand. was the manufactured sand was classified from material sand and wash water by a classifier, in the production plant manufacturing sand obtain manufactured sand, the fluid consisting of the washing water and the classifier machine of manufacturing sand one
Comprising a collecting device for collecting the parts, and the laser diffraction apparatus for measuring particle sizes manufactured sand collected fluid in, and a microcomputer for processing the measurement data of the laser light diffraction system, rod mill by the microcomputer And a supply amount of the raw material sand and / or washing water into the inside of the sand making control device.

The particle size measuring method by laser light diffraction has been established in powder engineering and the like, and the present invention utilizes this method.

[0012]

According to the present invention, when the raw material sand and the washing water are supplied and mixed to, for example, a rod mill of a sand production plant and washed, a part of the mixed fluid is collected when the mixed fluid is classified by a classifier. The particle size of sand is measured from the mixed fluid collected by the device, the particle size of sand is measured by a laser light diffraction device, and the measured data is input to a microcomputer to calculate and calculate the particle size distribution. Alternatively, the supply amount of cleaning water is adjusted.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the sand making control device according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic explanatory diagram for measuring the particle size of sand from a sand production plant using a sand making control device. The same components as those in the explanatory diagram of FIG.
Refer to the description.

As shown in FIG. 1, the sand making control device collects a mixed fluid 17 of the washing water 6 and the raw material sand 3 from the classifier 9 on the manufacturing plant 11 side and returns the mixed fluid 17 to the classifier 9. (See FIG. 3), the laser beam diffractor 12 for measuring the particle size of the sand 8 of the collected mixed fluid 17, the vibration feeder 2 and the water supply valve 5a are separately adjusted to supply the raw sand 3 and the washing water 6. A control panel 14 for controlling the amount; and a microcomputer 13 for receiving measurement data of the laser beam diffractor 12 and performing arithmetic processing on the test room 10 side.

The microcomputer 13 continuously monitors the operation status of the manufacturing plant 11 for a long time, outputs the calculation result such as the particle size distribution on a document or the like, for example, draws a drawing, and executes the control panel 1
An instruction is sent to the vibrating feeder 2 and / or the water supply valve 5a via 4 to adjust the amount of raw material sand 3 drawn out and the amount of washing water 6 supplied. At this time, it is possible to judge the replacement due to the increase or decrease of the filling amount of the rod 7 or the wear from the calculation result.

FIG. 2 is an explanatory view schematically showing a laser beam diffractor of the sand making control device of FIG. As shown in this figure, the laser beam diffractor 12 comprises a laser beam transmitting tube 12a for transmitting a laser beam 12c and a detector 12b for receiving the laser beam 12c.
By irradiating the mixed fluid 17 with the laser beam 12c between the detector 2b and the detector 12b, the particle size of the sand making 8 is measured, and the measurement signal is transmitted to the microcomputer 13. According to the experiment of the applicant, the particle size was measured to be 20 g.
It was found that sand making 8 could be measured in 44 seconds. Therefore,
If it is 500 g specified by JISA1102, it can be measured in 18 minutes.

FIG. 3 is an explanatory view schematically showing a sampling device of the sand making control device of FIG. As shown in this figure, the sampling device 16 comprises a fluid circuit for sampling the mixed fluid 17 from the classifier 9 and returning it. This circuit includes a pipe 16a connected to the classifier 9 and a pump P connected to the pipe 16a.
And a pipe 16b connected to the pump P and a pipe 1
Oversize removing device 1 provided between 6a and pump P
5 and the mixed fluid 17 of the classifier 9 is
a, and after removing the oversize or sand having a desired size, for example, a particle size of 2.5 mm or more, by introducing the same into the oversize removing device 15, the laser light diffractometer described above. 1
Measure the particle size according to 2. After the measurement, the mixed fluid 17 is pumped by the pump P to the classifier 9 through the pipe 16b and returned again. Thereby, loss or scattering of sand produced by the sample can be prevented, so that the measurement accuracy is good and the surrounding environment is not spoiled.

In this embodiment, a sample is collected from the classifier 9 to measure the particle size, the measured data is processed by a computer, and based on the result, the raw material sand and / or the washing water are automatically obtained. The supply was adjusted. This is because, if the supply amount of the raw material sand or the supply amount of the washing water is changed, the residence time and the stirring time of the sand in the rod mill 5 change, thereby changing the particle size quality of the sand making. Since the raw material sand varies depending on the particle size of the raw material sand, the raw material sand 3 before being ground by the rod 7 is also collected as a sample (see position A in FIG. 1) and mixed with water from a separately provided water distribution pipe or the like. As a fluid, and the laser
By measuring the particle size of the raw material sand 3 and calculating the measured data by a computer to establish a correlation between the particle sizes of the raw material sand and the sand production, the particle size of the sand production can be predicted more accurately in advance, It is possible to control the sand making to further improve the grain size quality.

Further, as a mixed fluid of sand making and water, sand making discharged from the classifier 9 to the belt conveyor 4a may be collected and mixed with water from a separately provided water distribution pipe or the like. it can.

Further, the supply amount of the raw material sand and / or its washing water is automatically adjusted and controlled via the control panel 14 according to the calculation result of the computer 13, but the control flow is determined in advance for the calculation result. And adjustment according to this flow can be performed.

Further, by collecting the raw material sand 3 on the belt conveyor 4 and measuring the particle size by the laser beam diffractometer 12 and comparing it with the sand production 8, the particle size of the sand production 8 can be predicted in advance.

[0023]

As described above, according to the sand making control device of the present invention, unlike the conventional method for measuring the particle size of sand, the sand sample collected is dried in a fluid state without drying.
Since the particle size can be measured continuously during the transport of the fluid, the measurement time can be reduced, and thus a large amount of sample can be measured.

The measurement data is processed by a computer, and the raw material sand and / or
Or adjust the supply amount of the washing water, change over time,
For example, control can be performed in accordance with rod wear and change in particle size of raw material sand.

Further, since arithmetic processing is performed by a computer without manual intervention, a large amount of measured data can be continuously processed, and thus labor can be saved. Further, since a large amount of measurement data is continuously processed, errors can be minimized, and thus measurement accuracy can be increased.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram for measuring a sand particle size from a sand manufacturing plant using the sand making control device of the present invention.

FIG. 2 is an explanatory view schematically showing a laser diffraction device of the sand making control device of FIG.

FIG. 3 is an explanatory view schematically showing a sampling device of the sand making control device of FIG. 1;

FIG. 4 is a schematic illustration of a conventional method for measuring sand particle size from a sand manufacturing plant.

FIGS. 5 (a) and 5 (b) are a schematic front view and a plan view, respectively, of an automatic sand particle weighing device using a robot hand.

[Explanation of symbols]

 3 Raw material sand 5 Rod mill 6 Wash water 8 Sand making 9 Classifier 11 Manufacturing plant 12 Laser beam diffractor (Laser beam diffractor) 13 Computer

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁷ Identification code FI E02D 5/18 E02D 5/18

Claims (1)

(57) [Claims] Claims 1. A raw material sand supplied to a rod mill is pulverized, washed with washing water, and then sand is classified from the pulverized raw sand and the washing water by a classifier to obtain sand. In the manufacturing plant of, in the classifier
A sampling device for collecting a portion of the fluid comprising a manufacturing sand and washing water, and the laser diffraction apparatus for measuring particle sizes manufactured sand collected fluid in, for processing the measurement data of the laser diffraction apparatus A sand making control device comprising a microcomputer, wherein the microcomputer adjusts a supply amount of the raw material sand and / or washing water into the rod mill.