JPS63166474A - Dry type sand making device and operation control method thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dry sand making apparatus and a method for controlling its operation.

[Conventional technology]

Conventionally, dry sand making equipment consists of a feeder that supplies raw ore, a cone crusher that compresses and crushes the raw ore supplied from the feeder, a rod mill that further crushes the crushed product discharged from the cone crusher by impact, and a rod mill that crushes the crushed product discharged from the cone crusher. Air classifiers are known that use gravity and centrifugal force to classify the discharged waste.
In order to maintain a constant quality such as odulus (coarse grain ratio), a level meter detects the level of raw ore in the cone crusher and changes the feeder supply amount to keep the level of raw ore in the cone crusher constant. This allows the cone crusher to always operate in stable choke feed mode,
Alternatively, the outlet gap of the cone crusher may be adjusted, the classification point of the air classifier may be changed, or the loading amount of the rod mill may be changed.

[Problem that the invention seeks to solve]

However, according to the above-mentioned conventional dry sand making apparatus, in order to increase the production amount of products, the cone crusher and the rod mill must be scaled up, resulting in an increase in the installation space.

In addition, in order to maintain product quality, there are many control variables such as feeder supply amount, cone crusher outlet gap, rod charging amount, and air classifier classification point, making it difficult to control optimal operation. There's a problem.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a dry sand making apparatus and a method for controlling its operation, which do not require an increase in installation space as production volume increases, and which enable optimal operation control.

[Means for solving problems]

In order to solve the above-mentioned problems, the specified invention provides a metering and feeding device that supplies raw ore with a variable supply amount, and a continuous variable acceleration system that crushes the ore supplied from the metering and feeding device at a high crushing ratio by circular vibration with high acceleration. This equipment is equipped with a continuous high-acceleration vibrating rod mill and an air classifier with a variable classification point that uses gravity and centrifugal force to classify the processed material discharged from the continuous high-acceleration vibrating rod mill.

The second invention is a method for controlling the operation of the device according to the above-mentioned specific invention, in which the FM value and washing loss of the product discharged from the air classifier are measured, and the metering and feeding device is supplied so that these values fall within the target values. This is a control method that changes the amount, the acceleration of a continuous high-acceleration vibrating rod mill, or the classification point of an air classifier.

[Effect]

According to the above means, the raw stone supplied from the metering and feeding device becomes crushed sand that resembles natural sand all at once in a short time, and the number of control variables is reduced, so that each control is performed accurately.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of the dry sand making apparatus of the first embodiment, and
is a metering and feeding device such as a belt feeder that measures and supplies 125 fins of raw stones stored in a raw stone bin 2 in a variable supply amount. 3 is the raw stone supplied from the metering supply device 1 to 14
This continuous high-acceleration vibrating rod mill 3 is a variable-acceleration continuous high-acceleration vibrating rod mill that crushes sand at a high crushing ratio into crushed sand similar to natural sand by circular vibration with a high acceleration of 0 or more. It is constructed as shown in FIG.

In the figure, reference numeral 4 denotes a horizontal cylindrical crushing cylinder consisting of a cylindrical body 5 and removable end plates 6 that close both ends of the body. The oscillators (both not shown) are elastically supported horizontally on a base (both not shown), and are disposed on both sides of the fuselage 5 via connecting plates 7, which are mounted oppositely near the middle of the fuselage 2. The 0 oscillator connected to the oscillator (not shown) has a variable frequency and vibration amplitude (variable acceleration ), which are elastically supported by a base with springs, etc., and are connected to one or two electric motors via a universal joint, and are mutually synchronized with a timing belt (none of which is shown). There is.

In the middle of the upper part of the body 5 of the crushing tube 4, there is provided an input port 9 into which the rough stone 8 is input, and in the lower part of the body 5, there is an outlet 10 having a width of about 1/6 circumference in the longitudinal direction. The discharge port 10 is surrounded by a discharge cover 11 which is provided over almost the entire length of the discharge port 10 and is opened downward. Inside the body 5 of the crushing tube 4, a cylindrical Rossdol liner 12 with a high aperture ratio made of high manganese cast steel with excellent wear resistance etc. is inserted into the body through legs 12a protruding from its outer peripheral surface. It is fitted concentrically with the inner circumferential surface of No. 5 with an appropriate gap between the two. The Rossdol type liner 12 is crushed by a large number of rods 13 inserted inside the liner, and prevents the processed material having a desired particle size from being over-pulverized, and also prevents the body 5 from being damaged by the rods 13. It prevents
While a large number of circumferential slits 12b are provided, a rod insertion port 14 that also serves as an inspection window is provided at the top of each end plate 6 in the crushing tube 4. It is closed by a removable lid 17 which also closes the rod entry hole 16 of the end plate liner 15 which is mounted inside the end plate liner 15.

In the continuous high-acceleration vibrating rod mill with the above configuration,
The rough stone inputted from the input port 9 is made to resemble natural sand in a very short time by the rod 13, which is moved in the direction of the arrow in FIG. The processed material is discharged from the machine through the discharge port 10 from the slit 12b of the Rossdol liner 12 without being over-pulverized.

The processed material discharged from the continuous high-acceleration vibrating rod mill 3 is supplied to an air classifier 19 by a conveyor 18, as shown in FIG. The air classifier 19 has a variable classification point that classifies the material to be processed using gravity and centrifugal force. For example, as shown in FIG. Coarse particles fall into the center of the inner cylinder 22, are radiated horizontally by the centrifugal force caused by the rotation of the dispersion plate 22, reach the inner periphery of the inner cylinder 24 provided in the casing 23, and have a large inertial force. On the other hand, fine particles with a small inertial force ride on the upward airflow generated by the rotation of the fan blades 26. It reaches the classification zone made up of the selector blade 27, moves to the casing 23 under the centrifugal force and collision action of the selector blade 27, and the casing 2
3 is configured to be discharged as dust from a dust discharge port 28 provided at the lower end of the housing.

Reference numeral 29 denotes an air vane provided in the inner cylinder 24, which circulates airflow generated by the fan blade 26 between the casing 23 and the inner cylinder 24.

In Fig. 1, 30 is a CPU of an electronic computer, which calculates the FM value and washing loss amount (JI) of the product from the air classifier 19.
The amount lost by the wash test specified in SA 1103, which is allowed up to a maximum of 7% when silt is not included. ) etc., the measurement data signal 31a1 from the sampling device 31 installed in the discharge path.
By inputting the weighing signal 1a from the metering supply device 1, the acceleration (rotation speed) signal 3a from the continuous high-acceleration vibrating rod mill 3, and the classification point (rotation speed) signal 19a from the air classifier 19, the FM value and washing are determined. Control signals 1b, 3b for changing the supply amount (processing amount), acceleration, and classification point for the metering and feeding device 1, the continuous high-acceleration vibrating rod mill 3, and the air classifier 19 so that the loss amount is within the target value; 19b to control the optimal operation of the dry sand making equipment, and also to display or print out the particle size table, FM duram, 100 mesh amount, washing loss amount, etc. of the product measured by the sampling device 31.
and outputs signals 32b and 33b to the printer 33.

Further, in FIG. 1, 34 and 35 are belt conveyors that convey products and dust discharged from the air classifier 19 to a product yard 36 and a dust yard 37, respectively.

Next, a method of controlling the operation of the dry sand making apparatus having the above structure will be explained with reference to FIGS. 5a and 5b.

First, the metering and feeding device 1, the continuous high-acceleration vibrating rod mill 3, and the air classifier 19 are operated at respective set supply amounts Q.
0, number of revolutions (900 rp plow) NM, and number of revolutions (115
0 rpm), the sampling device 31 measures the FM value and wash loss weighing of the product discharged from the air classifier 19, and inputs the measurement data signal 31a to the CPU 30. Supply amount Q
The measurement signal 1a of , the rotational speed signal 3a of the rotational speed NM of the continuous high-acceleration vibration rod mill 3, and the rotational speed signal 19a of the rotational speed NA of the air classifier 19 are input to the CPU 30.

Next, signals 32b and 33b are output from the CPU 30, and the display device 32 and printer 33 display a particle size table, FM graph, etc., while the FM value is changed to the target value ( 2,7±0.15) is smaller than the upper limit value FMIIAX (YES) or not (NO), and the upper limit F
If it is larger than MNAX (NO), check whether the washing loss measurement is smaller than the maximum allowable value L WAX (YES) or not (N
o) is compared and determined.

Washing loss measurement is larger than the maximum allowable value L WAX (No.
), whether the FM value is large (ulYEs) or not (No)
If the FM value is too large (NO), instructions for adjusting the rod of the continuous high-acceleration vibration rod mill 19 (changing the charging amount and rod diameter) and adjusting the vibration amplitude are sent to the display device 32 and printer 33. After the display is displayed, rod adjustment, etc. are performed, a sampling command is issued and the process returns to the beginning.

In addition, if the FM value may be large (YES), a comparison is made to determine whether the rotation speed NA of the air classifier 19 is smaller than the set rotation speed N A o (YES) or not (NO), and the set rotation speed N If A is larger than o (NO), instructions for rod adjustment and vibration amplitude adjustment of the continuous high-acceleration vibration rod mill 19 are displayed on the display device 32 and printer 33, and a sampling command is issued after the rod adjustment is performed. While returning to the beginning, the set rotation speed N A
If it is smaller than o (YES), the control signal 19b is output to increase the rotation speed NA of the air classifier 19, and then a sampling command is issued and the process returns to the beginning.

On the other hand, if the washing loss measurement is smaller than the maximum allowable value L, 4AM (YES), are you satisfied with the current situation (YES)?
), and if the current situation is unsatisfactory (No), the supply amount (processing amount) Q is smaller than the set supply amount Q0 (YES).
) or not (NO), and if it is larger than the set supply amount Q0 (NO), a sampling command is issued after the control signal 1b is output to decrease the supply amount Q of the metering and feeding device 1. Go back to the beginning. If the set supply amount Q0 is smaller (YES), it is compared and determined whether the rotation speed NA of the air classifier 19 is smaller than the set rotation speed NA (YES) or not (No), and the set rotation speed NA is larger. (NO
), the sampling command is issued after the control signal 19b is output to decrease the rotation speed NA of the air classifier 19 and returns to the beginning, while if the set rotation speed NA is smaller (YES> Continuous high acceleration vibration rod mill 3
After the control signal 3b is output to decrease the rotational speed NM, a sampling command is issued and the process returns to the beginning.

In addition, the rotation speed NM of the continuous high acceleration vibration rod mill 19
The control is performed in stages.

If the current state is satisfied (YES), the current operating state is maintained, and signals 32b and 33b are output to the display device 32 and printer 33 to indicate GOOD.
After PRODUCT is displayed, a sampling command is issued and the process returns to the beginning.

On the other hand, the FM value is smaller than the upper limit value FMMAX (YES)
In this case, as shown in FIG. 5, it is further compared and determined whether the lower limit value FM□ is smaller (YES) or not (NO).

If it is larger than the lower limit value FMMIN (NO), the washing loss measurement is also larger than the maximum allowable value L WAX (YES).
) or not (NO) is compared, and the maximum allowable values L and A are determined.
If it is smaller than X (NO), the current operating state is maintained, and signals 32b and 33b are output to the display device 32 and printer 33.
After RODUCT is displayed, a sampling command is issued and the process returns to the beginning.

If the maximum allowable value L MAX is greater (YES),
The rotation speed NA of the air classifier 19 is the set rotation speed NA.

It is compared and determined whether it is smaller (YES) or not (NO), and if it is larger than the set rotation speed N A o (NO), it is further determined that the supply amount Q of the metering and feeding device 1 is smaller than the set supply amount Q0 ( YES) or not (NO) is compared and determined, and if it is larger than the set supply amount Q0 (NO), a control signal 3b is output so as to gradually decrease the rotation speed NM of the continuous high acceleration vibration rod mill 3. After that, a sampling command is issued and returns to the beginning, while the supply amount is smaller than the set supply amount Q0 (Y
ES), a sampling command is issued after the control signal 1b is outputted to increase the supply amount Q of the metering and supplying device 1, and the process returns to the beginning.

If the set rotational speed NA is smaller (YES), a control signal 19b is outputted to increase the rotational speed NA of the air classifier 19 in accordance with the degree of excess of the washing loss measurement, and then a display device 32 to that effect is output. and printer 33
Signals 32b and 33b are output to perform display, etc., while a sampling command is issued and the process returns to the beginning.

On the other hand, if the FM value is smaller than the lower limit value FM□8 (YES), the supply amount Q of the metering and feeding device 1 is further reduced to the set supply amount Q0.
It is compared and determined whether it is smaller (YES) or not (No),
If it is larger than the set supply amount Q0 (No), the control signal 3b is output to increase the rotation speed NM of the continuous high-acceleration vibrating rod mill 3 in stages, and then a sampling command is issued and the setting returns to the beginning. Supply quantity is smaller than Q0 (Y
ES), a sampling command is issued after the control signal 1b is output to increase the supply amount Q of the metering and dispensing device 1, and the process returns to the beginning.

FIGS. 6 and 7 are schematic diagrams of the second and third embodiments of the dry sand making apparatus.

The dry sand making apparatus of the second embodiment includes a vibrating sieve 38 in the path of the processed material between the continuous high-acceleration vibrating rod mill 3 and the air classifier 19, and converts the sieved product of the vibrating sieve 38 into raw ore. bottle 2
The unsieved product is returned to the air classifier 19, and the continuous high-acceleration vibrating rod mill 3 and the air classifier 1
This is designed to reduce the load on the third
The dry sand making apparatus of the embodiment has a multi-stage vibrating sieve 39 interposed in the path of the processed material between the continuous high-acceleration vibrating rod mill 3 and the air classifier 19, and the sieved souvenirs of the first stage are passed through the raw stone bin. 2
and return the second tier sieve souvenirs to the product yard 36'.
At the same time, the unsieved product of the second stage is supplied to the air classifier 19 to reduce the load on the continuous high-acceleration vibrating rod mill 3 and the air classifier 19. It is designed to manufacture two types of products.

Other configurations and operation control methods are substantially the same as those of the dry sand making apparatus of the first embodiment, so the same components are given the same reference numerals and their explanations will be omitted.

(Effects of the Invention) As described above, according to the present invention, the number of crushing devices is reduced compared to the conventional technology, and the rough stone supplied from the metering and feeding device can be turned into crushed sand that approximates natural sand in a short time. Therefore, there is no need to increase the installation space for the equipment as the production volume increases.

Furthermore, since the number of control variables is reduced and each control is performed accurately, optimal operation control can be performed, and as a result, the quality of crushed sand can be significantly improved.

[Brief explanation of the drawing]

The figures show embodiments of the present invention. Fig. 1 is a schematic configuration diagram of a dry sand making apparatus according to the first embodiment, Fig. 2 is a longitudinal cross-sectional view of a continuous high-acceleration vibrating rod mill, and Fig. 3 is a longitudinal cross-sectional view of a continuous high-acceleration vibrating rod mill. m in Figure 2
4 is a longitudinal sectional view of the air classifier, FIG. It is a schematic block diagram of the dry sand making apparatus of 3rd Example. 1...Measuring supply device 2...Rough stone bin 3...Continuous high-acceleration vibrating rod mill 19...Air classifier
30... cpu31... Sampling device FMMAX... FM upper limit value FMMIN... FM lower limit value L... Washing loss amount L WAX... Allowable maximum value Q0... Set supply amount N Mo. ...Setting rotation speed N A o...Setting rotation speed application Person Kawasaki Heavy Industries, Ltd. Figure 6 Figure 7

Claims (2)

[Claims] (1) A metering and feeding device that supplies raw ore with a variable supply amount, a continuous type high-acceleration vibrating rod mill with variable acceleration that crushes the ore supplied from the metering and feeding device at a high crushing ratio using high-acceleration circular vibration, and a continuous type A dry sand making device characterized by being equipped with an air classifier with a variable classification point that classifies the processed material discharged from a high-acceleration vibrating rod mill using gravity and centrifugal force. (2) A metering and feeding device that supplies raw ore with a variable supply amount, a continuous type high-acceleration vibration rod mill with variable acceleration that crushes the ore supplied from the metering and feeding device at a high crushing ratio using high-acceleration circular vibration, and a continuous type A method for controlling the operation of a dry sand making equipment equipped with an air classifier with a variable classification point that classifies the processed material discharged from a high-acceleration vibrating rod mill using gravity and centrifugal force, and FM of the product discharged from the air classifier. The method is characterized by measuring the value and amount of washing loss, and controlling the supply amount of the metering and feeding device, the acceleration of the continuous high-acceleration vibrating rod mill, or the classification point of the air classifier so that these values fall within the target values. A method for controlling the operation of dry sand making equipment.