JPH1110087A - Automatic particle size measuring device for sand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic particle size measuring device for sand for enabling labor- saving and rationalization in a sand producing plant by enabling automatic particle size (FM) measurement for sand completely unattended on-line. SOLUTION: This device performs automatic grading measurement for sand on-line. It is constituted of a sampling means for periodically and automatically extracting a fixed quantity of crushed sand samples from a product crushed sand production line, a reduction means 16 for reducing the fixed quantity of the crushed sand samples extracted by the sapling means to take out a prescribed quantity of the crushed sand samples suited for particle size measurement, an automatic screening and particle size measuring means 17 for subjecting the prescribed quantity of the crushed sand sample received from the screening means 16 to screening by plural screens arranged from the upper stage to the lower stage in the decreasing order of a sieve opening and to collection by reversing the screens in the order from the lowest stage and for automatically measuring the particle size based on the weighing of the crushed sand samples of undersize and each oversize, and a discharge means 18 for discharging the collected crushed sand samples after automatic weighing by the automatic screening and particle size measuring means 17. A drying means 15 for drying the fixed quantity of the crushed sand sample extracted by the sampling means is attached when the occasion demands.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic particle size measuring apparatus for sand which can be attached to a sand making plant to automatically measure the fineness module (FM) of product sand and contribute to quality control. .

[0002]

2. Description of the Related Art In a sand making plant that crushes and crushes a crushed raw material such as crushed stone by a predetermined sand making means to produce a crushed sand having a desired coarse particle size distribution such as a single sand, the quality of the crushed sand is maintained. The management of FM value is an important issue in achieving
Sampling of the product crushed sand and particle size measurement were regularly performed by management personnel. Here, the single sand refers to sand that can be used as it is as a raw material for concrete or the like without requiring any mixing operation such as mixing with natural sand at a demand destination.

In the case of such artificial particle size measurement by a person in charge of management, conventionally, the measurement has been performed using a measuring device such as an automatic particle size measuring device disclosed in US Pat. No. 5,222,605. This automatic particle size measuring device can set up and down a circular sieve with a diameter of 200 mm and a height of 45 mm up to 6 stages, and sieve a fixed amount of sampled crushed sand sample by a plurality of stages of circular sieves with different sieve sizes. After separation, the sample weight of each stage can be automatically weighed by an electronic balance, and the installation and removal of the sieve can be performed by one-touch operation with a clamp. The structure can be performed automatically.

[0004]

The conventional particle size measuring means as described above is based on a completely unmanned operation during operation of the sand making plant, since the automatic particle size measuring device is basically of a batch processing structure. It is practically impossible to perform the following automatic particle size measurement unless the following measures are taken.

That is, the amount that can be measured at one time is usually about 5
It is 00 g, and it is indispensable to devise a method for accurately feeding the shredded sand sample from the production line of the sand making plant. On the other hand, in a crushed sand production line, water is often sprayed as a measure against dust to wet the sample. Therefore, it is impossible to measure the particle size only by sampling. Then, a sieving test with various moistures was carried out. As a result, it was confirmed that the sieving with high accuracy was possible if the moisture was 1% or less without clogging of the sieve. Since a device for reliably and smoothly discharging the crushed sand sample after measurement has not been provided yet, in order to be able to perform automatic particle size measurement periodically and without error, an automatic particle size measurement device is required. An emission mechanism needs to be developed.

[0006] When the crushed sand sample is in a wet state containing more than 1% of moisture, a drying means such as an automatic drying means for drying the crushed sand sample is additionally required in the automatic particle size measuring apparatus.

As described above, conventionally, there were many factors that hinder fully automatic particle size measurement on-line, so that it is absolutely necessary to rely on manual particle size measurement. In addition to the rise, there was a problem that the operation control of the sand production plant could not be performed smoothly.

The present invention has been made in order to solve such problems, and an object of the present invention is to provide an automatic sand particle size (FM) by completely unmanned online.
An object of the present invention is to provide an automatic particle size measuring device for sand capable of saving labor and streamlining in a sand making plant by enabling measurement.

[0009]

The present invention has the following configuration to achieve the above object. That is, the invention of claim 1 of the present invention is attached to a sand production plant that produces product crushed sand from crushed sand raw material by a product crushed sand production line including a line for crushing, sieving, and classification, and periodically and crushes the particle size of the crushed sand. An automatic particle size measuring device for sand for automatically measuring, wherein a crushed sand sample for performing a particle size measurement is periodically and automatically extracted from the product crushed sand production line by a fixed amount and a sampling means, which is extracted by the sampling means. A reducing means for extracting a predetermined amount of the crushed sand sample obtained by dividing a certain amount of the crushed sand sample by a predetermined value, and a predetermined amount of the crushed sand sample received from the reducing means, and Automatic sieving to automatically measure the particle size based on the measurement of the crushed sand sample under the sieve and on each sieve grain Measuring means, characterized by being configured to include a discharge means for discharging the collected crushed sand samples after automatic weighing in the automatic sieving granulometry means.

According to a second aspect of the present invention, in the automatic particle size measuring apparatus for sand according to the first aspect, the drying means for drying a predetermined amount of the crushed sand sample extracted by the sampling means is provided with a sampling means. The present invention is characterized in that it has a configuration provided with the reducing means.

According to a third aspect of the present invention, in the automatic particle size measuring device for sand according to the first or second aspect, the sampling means is provided in the middle of the chute for feeding the crushed sand after the classification. The drying means, the shrinking means, the automatic sieving particle size measuring means and the discharging means, at least the shrinking means, the automatic sieving particle size measuring means and the discharging means are located at a lower portion with respect to the sampling means, and are described in the upper part in the order described. From the bottom to the bottom.

According to a fourth aspect of the present invention, there is provided the automatic particle size measuring apparatus for sand according to the second aspect, wherein a drying means is provided at an upper portion, and a reducing means is provided at a lower portion thereof, thereby automatically sieving. Set up beside the particle size measuring means, lifting between the shrinking means and the automatic sieving particle size measuring means by inverting the cup directly attached to the chain conveyor by combination of horizontal, vertical and diagonal movement It is characterized by being configured to be connected by a cup-type conveyor to be moved.

According to a fifth aspect of the present invention, in the automatic particle size measuring apparatus for sand according to the second aspect, a hopper for receiving a certain amount of crushed sand sample from the sampling means is provided in the reducing means. A drying means made of a flat plate electric heater is attached to the peripheral wall of the hopper, and the drying means and the reducing means are integrated.

According to a sixth aspect of the present invention, in the automatic grain size measuring device for sand according to the second aspect, the vibration feeder for feeding a certain amount of the crushed sand sample from the sampling means is reduced. And a hot air dryer or a flat plate heating element is attached to the vibrating feeder, and the drying means and the reducing means are integrated.

According to a seventh aspect of the present invention, there is provided the automatic grain size measuring device for sand according to the first or second aspect, wherein the sampling means is provided in the substantially vertical direction for feeding the product crushed sand. A casing composed of a sealed container interposed in the middle of the chute, a vertical axis penetrating the casing up and down, and reversibly rotatable at a fixed rotation angle about the vertical axis supported by the vertical axis. A crushed sand sample intake container provided in the casing and capable of taking in a part of the product crushed sand passing through the product crushed sand feeding chute, wherein the crushed sand sample intake container has a vertical end in a radial direction with respect to the vertical axis. Along with being formed in a slit-like intake that is significantly longer in dimension than the transverse dimension in the direction perpendicular to it,
A bottom wall portion facing the intake port is formed on an inclined wall having a downward slope toward the vertical axis side, and the intake port is connected to a product crushed sand intake port which is a connection portion with the chute on the top wall portion of the casing. The vertical axis is provided so as to be able to reciprocate while traversing at a position directly below, and the vertical axis is a hollow shaft having a portion from a middle portion to a lower end including a support portion of the crushed sand sample receiving container communicating with the crushed sand sample receiving container. And a crushed sand sample discharge pipe for collecting and discharging the crushed sand sample taken in the crushed sand sample receiving container.

According to an eighth aspect of the present invention, in the automatic particle size measuring apparatus for sand according to the second aspect, the drying means receives the crushed sand sample from the sampling means and forms a fluidized bed and a stationary bed. A drying chamber for drying by introducing hot air for drying from below while forming a layer on the top and bottom, and a vibration / vibration dryer equipped with a vibration device for applying vibration to the dried crushed sand sample of the stationary layer and guiding it to the sample outlet It is characterized by having the following configuration.

According to a ninth aspect of the present invention, in the automatic grain size measuring device for sand according to the seventh or eighth aspect, the reducing means receives a certain amount of the crushed sand sample from the preceding stage. For this purpose, a funnel arranged with the cylinder part vertical,
A crushed sand sample introduction conduit coaxially provided vertically below the lower end outlet of the cylindrical portion, and the cylinder portion and the crushed sand sample obliquely intersecting the cylindrical portion so as to block the lower end outlet immediately below. A disk rotatably provided between the inlet pipe and a cylinder immediately below the lower end outlet for discharging a crushed sand sample falling on the disk from the lower end outlet to the side; Part and a crushed sand sample discharge line, which is provided diagonally with respect to the crushed sand sample input line, the disk is formed by a disk having the center as the center of rotation, and extends from the circumference toward the center, In addition, a notch corresponding to an equally circular shape equally divided by a predetermined number is provided, and a configuration is provided such that the lower end outlet can be blocked by a circular peripheral portion including the notch. I do.

Further, of the present invention, the invention of claim 10 is
10. The automatic particle size measuring device for sand according to claim 7, 8 or 9, wherein the discharging means is provided in relation to a measuring pan mounted on a weighing table below the automatic sieving particle size measuring means. A lifting longitudinal actuator for raising and lowering one side of the measuring pan before and after and on the right and left sides and the other side on the opposite side simultaneously to raise and lower the stroke simultaneously in order to lift the measuring pan from the weighing platform by tilting; During the lifting operation with the short-side actuator for lifting and the discharging operation in which the measuring pan is tilted by lifting from the weighing platform, the open state where the lower part is opened due to the effect of the crushed sand sample trying to slide down the measuring pan is maintained, and the measuring pan is weighed. At the time of the weighing operation mounted horizontally on the table, the circumference of one side or the other side is maintained so that the closed state is maintained without closing the lower part without being affected by the crushed sand sample accumulated in the weighing pan. Characterized by being configured to include an exit gate which is provided to be opened and closed in the weighing pan serve as the plate.

[0019]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 schematically shows a configuration of an example of a sand making plant according to an embodiment of the present invention. The sand making plant shown in FIG. 1 includes a crushed sand material supply line formed by including a crushed sand material bin 1 and a supply device 2 realized by an electromagnetic feeder, a sand maker 3 realized by a cage mill or the like, and a sieve. According to an embodiment of the present invention, a product crushed sand production line including a sieving device 4 including a sieve required for separation, a classifier 6 including a dry classifier and the like and a return unit 11 including a conveyor and the like is provided. It is composed of an automatic particle size measuring device 8 and an automatic particle size adjusting device 7 for controlling each operation of the supply device 2, the sand maker 3 and the classifier 6. The classifier 6 may be either a dry type or a wet type. In some cases, a humidifier may be used after the classifier 6.

The crushed sand raw material is supplied from a crushed sand raw material bin 1 to a supply device 2.
, And supplied to the sand maker 3 and crushed by the sand maker 3. The crushed crushed sand raw material is sieved by the sieving device 4, and the crushed sand raw material under the sieve is fed into the next classifier 6, while the crushed sand raw material on the sieve is supplied through a return means 11 to the crushed sand raw material supply line. To the sand making machine 3 as a raw material.

The crushed product sent to the classifier 6 is classified here, taken out, and humidified and kneaded as necessary to produce crushed product 12. On the other hand, the fine powder 13 obtained at the time of classification by the classifier 6 is stored separately from the product crushed sand 12.

As described above, during the sand making operation, the crushed sand sample is periodically supplied from the crushed sand production line by the automatic particle size measuring device 8 including the measuring device main body 9 and the sampling device 10 as sampling means. Further, a certain amount is automatically extracted and its particle size is automatically measured. In this case, an appropriate time within the range of 30 minutes to 1 hour is selected as the measurement cycle. Then, based on the measurement result and the supply amount of the crushed sand raw material measured by the conveyor scale 14, the supply amount of the supply device 2, the rotation speed of the sand maker 3, and the rotation speed of the classifier 6 are adjusted by the automatic particle size adjustment device 7. Controlled.
In this way, it is possible to automatically produce crushed sand having a stable particle size distribution and change the product particle size.

FIG. 2 is a front view (a) and a plan view (b) of the apparatus configuration of the measuring device main body 9 in the automatic particle size measuring device 8 described above. The measuring device main body 9 includes a drying device 15 as a drying device, a reducing device 16 as a reducing device, an automatic sieving particle size measuring device 17 as an automatic sieving particle size measuring device, and a discharging device 18 as a discharging device. In a state of being sequentially arranged from the upper stage to the lower stage in accordance with the description order, the housing is housed and fixed in a housing whose four peripheral surfaces are covered by a cover 19. The measuring device main body 9 firstly crushes a crushed sand sample which is extracted by a sampling device 10 whose structure will be described later and sent through a duct 20, for example, about 5 kg and contains 3% of maximum moisture, in a drying device 15. To make a crushed sand sample containing 0.5% or less of water within 15 minutes, for example.

Next, in a decompressor 16 provided immediately below the sample outlet of the drying device 15, about 5 kg of the dried
Of the crushed sand sample of about 500 which is a standard amount measurable by the automatic sieving particle size measuring device 17 provided immediately below.
Divide by 1/10 into g. About 500 g of this reduced crushed sand sample was sent to an automatic sieving particle size analyzer 17,
Here, the weight is measured for each crushed sand with different sieve sizes,
Let the particle size be measured automatically.

The automatic sieving particle size measuring device 17 is a known particle size measuring device similar to the automatic particle size measuring device disclosed in the above-mentioned US Pat. No. 5,222,605, and its structure and operation are as follows. It is on the street. A plurality of sieves having different sieve sizes, for example, six sieves (for example, JIS sieve)
Are stacked in the casing from the upper stage to the lower stage in ascending order of the sieve size and fixed horizontally by clamps. Under this condition, about 500
g of the crushed sand sample is put into the uppermost sieve, and each sieve is appropriately shaken to be sieved.

By sieving in this way,
On each of the sieves, a crushed sand sample having a corresponding sieve size is mounted, while a so-called crushed sand sample passing through the lowermost sieve is
It is accommodated in a measuring pan provided at a lower part in the casing. When sieving is over, after automatically releasing the fixing of the sieve stage,
First, the measuring pan is weighed, and the crushed sand sample of the group having the finest sieve is weighed. Then, descend the bottom sieve,
Invert to the front side, move to the front side and move sequentially, and in the meantime, perform automatic cleaning of the sieve from the back side with a brush, and put the crushed sand sample on the sieve in the lowermost sieve into the measuring pan. The whole amount is dropped, and the measuring pan is weighed by an electronic balance provided in the apparatus.

Thereafter, the operation involving lowering, reversing, ascending and automatic cleaning during each step is sequentially repeated from the second screen from the bottom, and the measuring pan is weighed each time. When the corresponding weighing is completed, the sieves of each stage are moved in reverse order, reversed to the back side, and moved to the back side in order, and returned to the initial stacking state, and each is clamped. By fixing horizontally, it is returned to the initial state in preparation for the next particle size measurement, and thus a series of operations is completed, and 7 groups of crushed sand samples with different sieves are measured. Data on the particle size (FM value) of a similar crushed sand sample can be automatically obtained.

When the particle size measurement by the automatic sieving particle size measuring device 17 is completed as described above, the measured crushed sand sample deposited in the measuring pan is discharged from the measuring pan by the discharging device 18 whose structure will be described later. Discharge, for example,
Return to the product crushed sand production line after classifier 6 and thus,
One automatic particle size measurement online is completed.

FIG. 3 conceptually shows the structure of the sampling device 10 in the automatic particle size measuring device 8. The illustrated sampling apparatus 10 reversibly drives the casing 22, a vertical shaft 23, a crushed sand sample receiving container 24 integrally attached to the vertical shaft 23, and the vertical shaft 23 to a fixed rotation angle (θ). And a driving source (not shown). The casing 22 is formed of a closed container, and is interposed in the middle of a product crushed sand feeding chute 21 which is arranged substantially vertically and forms a part of the product crushed sand production line. The vertical shaft 23 penetrates the casing 22 vertically at a position appropriately spaced from the product crushed sand feeding chute 21 and is provided rotatably around its own axis.

The crushed sand sample receiving container 24 is formed as a thin flat container having a horizontal opening at the top end and a trapezoidal vertical surface, and a vertical end L in the radial direction with respect to the vertical axis 23 at the top end. Is formed in a slit-like intake 25 which is significantly longer than the transverse dimension W perpendicular thereto, and a bottom wall portion 26 facing the intake 25 is formed on a downwardly inclined wall facing the vertical axis 23. You. In the crushed sand sample receiving container 24 having such a structure, the intake port 25 is crossed in a state in which it is substantially in contact with the product crushed sand intake port 27 which is a connection portion of the top wall of the casing 22 with the chute 21 at a position directly below. And is integrally attached to the vertical shaft 23 so as to be able to reciprocate.

On the other hand, the vertical shaft 23 is formed as a hollow shaft communicating with the inside of the container 24 from the intermediate portion to the lower end including the portion supporting the container 24 for taking a crushed sand sample. The crushed sand sample taken into the container 24 is collected, and the structure also serves as a crushed sand sample lead-out pipe led out from the outlet 28 at the lower end.

The sampling device 1 configured as described above
0 samples a crushed sand sample of a fixed amount, for example, about 5 kg, as described below. That is, the vertical shaft 23 is rotated left and right by a constant rotation angle (θ) by a drive source (not shown), so that the crushed sand sample receiving container 24 is traversed by the product crushed sand inlet 27 and reciprocated. Since the intake port 25 of the crushed sand sample receiving container 24 crosses the product crushed sand flowing down in the product crushed sand feeding chute 21 at an appropriate speed, a part of the crushed sand sample is taken into the intake container 24. The crushed sand sample thus obtained can be
It is slid down the inclined bottom wall portion 26, passes through the hollow portion of the vertical shaft 23, and is discharged from the discharge port 28. In this case, the rotation speed of the vertical shaft 23 is adjusted according to the flow rate of the crushed sand sample in the product crushed sand feeding chute 21 and the reciprocating movement or the forward movement and the backward movement are performed at each sampling. It is possible to accurately take out about 5 kg of the crushed sand sample by the sampling device 10 by, for example, alternately performing it.

FIG. 4 shows the appearance of the structure of the drying device 15 in the automatic particle size measuring device 8. The drying device 15 in the illustrated example is formed by a vertically long flow / vibration dryer, and includes a drying chamber 29 attached to a gantry, and a vibration device 30 provided at the bottom of the drying chamber 29. The drying chamber 29 is composed of a sample storage chamber and a hot air chamber formed vertically adjacent to each other through a partition through which hot air passes but through which a crushed sand sample does not pass. A hot air inlet 31 is opened in a side wall of the hot air chamber. A sample inlet 32 into which the crushed sand sample is introduced, a sample outlet 34 from which the dried crushed sand sample is discharged, and a compressed air inlet 33 into which the compressed air for preventing clogging is fed are provided at the lowermost side wall of the sample storage chamber. Are opened respectively,
A compressed air inlet 35 and an exhaust port 36 are opened in the uppermost side wall of the sample storage chamber. On the other hand, the vibration device 30
The partition is provided obliquely below the hot air chamber so as to vibrate the partition at high speed.

The drying device 15 includes the sampling device 1
5 kg of the crushed sand sample taken out by the sample inlet 32
Then, hot air, for example, pressurized hot air at 150 ° C. is sent from the hot air inlet 31. By this hot air supply, the sample storage chamber
A layer of the crushed sand sample is formed above the fluidized bed and below the stationary layer, and at the same time, the crushed sand sample is quickly dried by contact with pressurized hot air. When the drying is completed with the lapse of a predetermined time, the hot air supply is stopped and the vibrating device 30 is started to apply high-speed vibration to the stationary layer of the crushed sand sample deposited on the partition, and the crushed sand sample is discharged to the sample outlet 34. And discharged from the outlet 34. Thus, the drying device 15 is capable of quick drying with hot air, for example, about 5 kg and a maximum moisture of 3%.
A drying process for reducing the crushed sand sample to 0.5% or less in 15 minutes or less is possible.

FIG. 5 shows a device configuration of the decompressor 16 in the automatic particle size measuring device 8. Illustrated example of a decompressor 1
Reference numeral 6 denotes a casing in which a hopper 37, a trough 38, a vibration feeder 39, a funnel 40, a crushed sand sample discharge pipe 43, and a crushed sand sample input pipe 41 are arranged in this order from above.
0, a disk 42 is provided in relation to the crushed sand sample discharge line 43 and the crushed sand sample input line 41, and a driving device for rotating the disk 42 and controlling the driving device and the vibration feeder 39 are controlled. A controller 44 is provided.

The hopper 37 is provided below the sample outlet 34 of the drying device 15 so as to receive about 5 kg of a dried crushed sand sample. The trough 38 is provided laterally with a slight downward slope on the trough outlet side in connection with the lower outlet of the hopper 37. In this duct 38,
The vibrating feeder 39 is connected, and the vibration is applied from the feeder 39 so that the crushed sand sample supplied from the hopper 37 to the inlet side of the trough 38 is quantitatively fed to the outlet side.

The funnel 40 is connected to the outlet side of the duct 38 so as to be able to receive the crushed sand sample sent from the trough 38, and is arranged with the cylindrical portion vertical. On the other hand, the crushed sand sample introduction pipe 41 is formed by a pipe having a larger diameter than the cylinder of the funnel 40, and is provided coaxially and vertically below the lower end outlet of the cylinder. The crushed sand sample discharge line 43 is provided between the lower end portion of the cylindrical portion and the upper end portion of the crushed sand sample input line 41, and is provided so as to intersect at a downward slope. The crushed sand sample discharge line 43 has a hexagonal plate body in an upper half portion including a lower end portion of a cylindrical portion and a portion crossing an upper end portion of the crushed sand sample input line 41, and a lower half portion has a cylindrical shape. As shown in FIG. 5 (C), a through hole 51 is formed at a position directly below the cylindrical portion of the funnel 40 in the plate portion, and the plate 51 falls from the cylindrical portion. The crushed sand sample can be smoothly introduced into the crushed sand sample introduction conduit 41 without blocking.

On the other hand, the disk 42 is made of, for example, a thin disk made of metal, and is provided with a crushed sand sample discharge pipe 43 so that the lower end outlet of the cylindrical portion of the funnel 40 can be blocked at a position directly below. It is rotatably provided on a hexagonal plate. That is, the disk 42 has a hexagonal shape in which the center of the disk is fitted and fixed to a support rotation shaft 49 rotatably attached to the hexagonal plate via a bearing 48. Keep parallel to the plate, and
It is rotatable around the disk while blocking the lower end outlet. Further, the disc 42 has a cutout 5 in one place.
0 has been cut. This notch 50 is
It is an important component in forming a reducing action together with itself, a shape extending from the circumference in the axial center direction, and a shape equivalent to an equally-divided circle obtained by equally dividing a circle by a predetermined number, for example, a 10-piece circle And the disk 42 rotates,
The funnel 40 can pass once just below the lower end outlet of the cylindrical portion of the cylindrical portion once per rotation.

The driving device for rotating and driving the disk 42 includes a motor 45, a gear head 46 directly connected to a shaft of the motor 45, a sprocket fitted to an output shaft of the gear head 46, and the support rotary shaft 49. Timing belt 4 laid between the input side and the sprocket
And the driving device includes a controller 4
The disk 42 is driven to rotate at an appropriate speed on the basis of a rotation control command from the controller 4.

The mode of operation of the above-mentioned decompressor 16 is as described below. When about 5 kg of the crushed sand sample discharged from the drying device 15 is put into the hopper 37, the crushed sand sample is
The trough 38 vibrated by the vibrating feeder 39 guides toward the outlet of the trough 38 and quantitatively enters the funnel 40. In this case, the input amount is determined by the controller 44.
Can be changed by operating an adjustment knob (not shown) provided on the control panel. Thus, the crushed sand sample put into the funnel 40 falls on the disk 42.

Since the disk 42 is rotating, the crushed sand sample that drops is only when the notch 50 arrives immediately below the lower end outlet of the cylindrical portion of the funnel 40.
When the lower end outlet is obstructed by the disk 42, it slides down on the disk 42 and flows down to the crushed sand sample discharge line 43. As a result, as described above, since the disk 42 has a shape equivalent to a ten-section circle, about 5 kg
1/10 of the crushed sand sample of
10 flows to the crushed sand sample discharge line 43, and 1 /
500 g of the crushed sand sample reduced to 10 is introduced into the automatic sieving particle size measuring device 17 from the crushed sand sample introduction line 41, and the remaining 9/10 is discharged from the crushed sand sample discharge line 43, for example, a product crushed sand production line. Is returned to. In this way,
The decompressor 16 smoothly performs the decompression operation while maintaining an accurate amount.

FIG. 6 shows a device configuration of the discharging device 18 in the automatic particle size measuring device 8. Ejector 18 shown
Is provided in connection with a measuring pan 52 mounted on a measuring device 59 realized by a weighing table and disposed below the automatic sieving particle size measuring device 17, and includes a lifting longitudinal actuator 53, Lifting Short Side Actuator 54
And the exit gate 57 are configured as element members.

The lifting-side longitudinal actuator 53 and the lifting-side short-side actuator 54 are composed of, for example, two fluid pressure cylinders having different piston rod strokes. -Either left or right, for example, at the front and rear positions,
The weighing pan 52 is attached to the gantry 58 in a vertically upward direction, and is provided immediately below the center of the front edge and the center of the rear edge of the bottom of the measuring pan 52. At the distal end portions of the piston rods of both the cylinders 53 and 54, a lifting metal 55 made of a bent plate piece having a horizontally elongated deformed U-shape is fixed. The lifting bracket 55 has recesses formed in the rising pieces at both ends, and a detent shaft 61 is fixed to a base horizontally extending between the rising pieces.

The two fluid pressures 53 constructed as described above,
FIG. 6 shows a state when the weighing pan 52 is weighing.
As shown in (a) and (b), when the piston rods of both cylinders 53 and 54 are lowered, the lifting bracket 55 at the end of the cylinder does not touch any part, and therefore the measuring pan 52 Mounted horizontally in position. When the crushed sand sample in the weighing pan 52 is discharged after the weighing is completed, FIG.
As shown in (c), when the piston rods of both cylinders 53 and 54 are extended upward, the measuring pan 52 is lifted by the lifting metal 55 with the pin 56 provided on the edge plate thereof.
By tilting the front side downward and the rear side upward according to the stroke difference between the two cylinders 53 and 54, the measuring pan 5
The crushed sand sample in 2 is slid to the front side and discharged through the discharge chute 64. In this case, it is not always necessary to discharge the entire amount, and the inclination of about 30 ° shown in the figure is sufficient. With this inclination, the exit gate 57 is opened, and the crushed sand sample can be discharged smoothly. .

The outlet gate 57 is a plate piece provided also as a part of the peripheral plate of the measuring pan 52 and is a side lifted by the short lifting actuator 54 (in this case, the front side). By hanging a part of the peripheral plate in (1) swingably by a hinge and attaching the peripheral plate to the peripheral portion of the measuring pan 52, the exit gate 57 is provided.
Is formed. When the weighing pan 52 is positioned in a horizontal state, the exit gate 57 is closed so that the crushed sand sample in the weighing pan 52 does not come out as shown in FIG. It functions as a wall, while when the measuring pan 52 is tilted as shown in FIG.
Due to the weight of the gate itself and the effect of the crushed sand sample trying to slide down inside the measuring pan 52, the lower part is opened and the crushed sand sample can be discharged smoothly. In addition,
The operation of the two cylinders 53 and 54 requires only one solenoid valve, so that the mechanism is simple.
Since the cylinders 3 and 54 are provided with bellows 60, the cylinders 3 and 54 have a feature of being excellent in dustproofness.

FIG. 7 shows a device configuration of a measuring device main body in an automatic particle size measuring device according to a second embodiment of the present invention. The illustrated embodiment is characterized in that the height of the measuring device main body 9 is reduced as much as possible to reduce the size of the device. The separator 16 is disposed at the lower part thereof, and they are set on the side of the automatic sieving particle size measuring device 17. The configuration is such that the upper chute of the device 17 is connected by a cup type conveyor 62.

The cup-type conveyor 62 is a transfer device also called a sample conveyor, and has a simple structure in which the cup 63 is directly attached to a chain conveyor. A chain conveyor provided to be able to repeat the movement
A plurality of cups 63 having a carrying weight of about 500 g per piece are directly attached at a predetermined pitch, and at a predetermined position of a rail for guiding a chain, that is, at a position directly above the chute at the upper part of the automatic sieving particle size measuring device 17. At the position, a cup reversing unit is attached.

Cup type conveyor 6 having such a structure
2 receives about 500 g of the crushed sand sample dropped from the lowermost end of the crushed sand sample introduction pipe 41 of the decompressor 16 by the cup 63, and then horizontally moves the cup 63, moves vertically upward, and then moves horizontally. Automatic sieving particle size analyzer 1
When reaching the position immediately above the chute above the chute 7, the cup reversing unit reverses the cup 63 containing the crushed sand sample. By this reversing operation, the crushed sand sample is dropped on the chute, and thereafter, the empty cup 63 is horizontally moved and vertically moved down, then horizontally moved back to the initial position. Thus, the cup 63
By carrying the lifting movement including the reversal, it is possible to smoothly carry and drop the crushed sand sample. In addition, the movement of the cup-type conveyor 62 can be moved, inverted, and dropped between high and low levels by a combination of horizontal, vertical, and diagonal movements. Thus, by employing the cup-type conveyor 62, the entire equipment can be moved. The purpose of making the height sufficiently low is achieved here.

FIG. 8 schematically shows a hopper section of a contractor 16 in an automatic particle size measuring apparatus 8 according to a third embodiment of the present invention. The automatic particle size measuring device 8 according to the illustrated embodiment is configured such that when the crushed sand sample extracted for performing the particle size measurement has a relatively low water content,
%, The drying means can be simplified.
5 is an example in which a simple dryer is installed in place of the dryer 5. An example of the dryer in this case is a flat plate electric heating element 65.
Is used, and this flat-plate electric heating element 65 is attached to the peripheral wall of the hopper 37 in the decomposer 16, and the hopper 37 itself is warmed.
The structure is such that the crushed sand sample accommodated therein is dried by the heat generated by the flat plate electric heating element 65.

There are various types of flat-plate electric heaters 65 on the market as commercial products. For example, a Ni-Cr ribbon wire is uniformly wound around heat-resistant mica, and further insulated with mica. After being covered with, a press formed by a press machine to form a surface heating element is used. As a heating device for simplifying the drying means,
Not only the flat plate heating element 65 but also a structure in which hot air is sent by a dryer to the vibrating feeder 39 of the shrinker 16 to dry the crushed sand sample moving in the trough 38 is used. Needless to say, it may be used instead of. By simplifying the drying means in this way, it is possible to reduce the equipment cost of the automatic particle size measuring device for sand.

[0051]

The present invention is embodied in the form described above and has the following effects.

According to the first or second aspect of the present invention, accurate and accurate information on the particle size (FM) of the product crushed sand can be obtained directly and automatically from the product crushed sand production line. Since it can be done reliably and easily, it is possible to stably produce high-quality sand.

According to the third aspect of the present invention, a series of processing means consisting of sampling a predetermined amount of crushed sand sample, drying, shrinking, automatically sieving particle size measurement, and discharging the weighed crushed sand sample is resistant to gravity. Since the measurement is carried out smoothly in a natural flow without any problem, a stable and reliable automatic particle size measurement is realized.

According to the fourth aspect of the present invention, the height of the equipment can be reduced while maintaining the original automatic measurement function by adding a lifting means using a cup type conveyor having a simple structure. Can be made more compact.

According to the fifth or sixth aspect of the present invention, as a result of the simplification of the drying means being achieved, the cost can be significantly reduced in addition to the downsizing of the apparatus.

According to the seventh to tenth aspects of the present invention, it is possible to provide a mechanism suitable for smoothly and surely performing each of the means for sampling, drying, reducing, and discharging.
The effect of increasing the reliability of the device is further exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a sand making plant according to an embodiment of the present invention.

FIG. 2 is a diagram showing a device configuration of a measuring device main body 9 in the automatic particle size measuring device 8 according to the first embodiment of the present invention;
Is a front view, and (b) is a plan view.

FIG. 3 is a perspective view conceptually showing a structure of a sampling device 10 in the automatic particle size measuring device 8 according to the first embodiment of the present invention.

FIG. 4 is an external view of a drying device 15 in the automatic particle size measuring device 8 according to the first embodiment of the present invention, wherein (a) is a front view and (b) is a side view.

FIGS. 5A and 5B are device configuration diagrams of a decomposer 16 in the automatic particle size measuring device 8 according to the first embodiment of the present invention, wherein FIG. 5A is a front view, FIG. 5B is a side view, and FIG. It is a front view of a part.

FIGS. 6A and 6B are configuration diagrams of a discharging device 18 in the automatic particle size measuring device 8 according to the first embodiment of the present invention, wherein FIG. 6A is a front view at the time of weighing, FIG. () Is a front view at the time of discharge.

FIGS. 7A and 7B are device configuration diagrams of a measuring device main body in an automatic particle size measuring device according to a second embodiment of the present invention, wherein FIG. 7A is a front view and FIG.

FIG. 8 is a perspective view showing a hopper section of a contractor in an automatic particle size measuring device according to a third embodiment of the present invention.

[Explanation of symbols]

1 ... crushed sand raw material bottle, 2 ... supply device,
3 sand maker, 4 sieving device, 6 classifier, 7 automatic particle size adjusting device, 8 automatic particle size measuring device, 9
... Main body of measuring device, 10 ... Sampling device,
11 ... return means, 12 ... product crushed sand,
13: fine powder, 14: conveyor scale,
15 ... drying device, 16 ... contractor,
17: automatic sieving particle size measuring device, 18: discharging device,
19 ... cover, 20 ... duct,
21: Product feeding chute, 22
... casing, 23 ... vertical axis, 24
... Crushed sand sample container, 25 ... Inlet, 2
6 ... bottom wall, 27 ... product crushed sand inlet, 28 ... outlet, 29 ... drying room, 30 ... vibrating device, 31 ... hot air inlet, 32 ... sample inlet, 33 ...
Compressed air inlet, 34 ... Sample outlet, 35
... compressed air inlet, 36 ... exhaust outlet, 3
7 ... hopper, 38 ... trough, 3
9 ... vibrating feeder, 40 ... funnel,
41 ... crushed sand sample introduction line, 42 ... disk,
43: crushed sand sample discharge line, 44: controller, 45: motor, 46: gear head, 47: timing belt, 4
Reference numeral 8: bearing, 49: support rotating shaft, 50: notch, 51: through hole, 52: measuring pan, 53: lifting long actuator, 54: lifting short actuator, 55: lifting bracket, 56: pin ,
57: Exit gate, 58: Stand,
59: measuring instrument, 60: bellows,
61 ... Non-rotating shaft, 62 ...
Cup conveyor, 63 ... cup, 64 ...
Discharge chute, 65 ... flat plate electric heating element,

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hideyuki Inayoshi 2-3-1 Shinhama, Arai-machi, Takasago City, Hyogo Prefecture Inside Kobe Steel, Ltd. Takasago Works (72) Inventor Kunio Iwamoto 9-37, Midoricho, Kawaguchi-shi, Saitama (72) Inventor Masafumi Onomura 5-27-7 Sendagaya, Shibuya-ku, Tokyo Inside Seisin Corporation

Claims (10)

[Claims] 1. A sand automatic plant attached to a sand making plant for producing product crushed sand from crushed sand raw material by a product crushed sand production line including a crushing, sieving, and classification line, and periodically and automatically measuring the particle size of the crushed sand. A particle size measuring device, a sampling means for periodically and automatically extracting a fixed amount of a crushed sand sample for performing a particle size measurement from the product crushed sand production line; and a constant amount of the crushed sand sample extracted by the sampling means. A reducing means for taking out a predetermined amount of the crushed sand sample divided by a predetermined value, and a plurality of crushed sand samples received from the reducing means, the plurality of crushed sand samples being arranged from the upper stage to the multi-stage in descending order of the sieve mesh size. Automatic sieving particle size measuring means for automatically measuring the particle size based on the measurement of the crushed sand sample under the sieve and on each sieve, and the automatic sieve Minute Discharging means for discharging the collected crushed sand sample that has been automatically weighed by the crushing particle size measuring means. 2. The automatic sand particle size measuring apparatus according to claim 1, further comprising a drying means for drying a predetermined amount of the crushed sand sample extracted by the sampling means, between the sampling means and the reduction means. 3. A sampling means is provided in the middle of the chute for feeding the crushed sand after the classification, and is at least a reducing means, an automatic sieving means in a drying means, a reducing means, an automatic sieving particle size measuring means and a discharging means. The automatic particle size measuring apparatus for sand according to claim 1 or 2, wherein the particle size measuring means and the discharging means are located at a lower portion with respect to the sampling means and are sequentially arranged from the upper stage to the lower stage in the stated order. 4. A drying means is provided at an upper part, and a shrinking means is provided at a lower part thereof, and is installed beside the automatic sieving particle size measuring means. A chain is provided between the shrinking means and the automatic sieving particle size measuring means. 3. The automatic particle size measuring apparatus for sand according to claim 2, wherein the cups directly attached to the conveyor are connected by a cup type conveyor that moves by lifting, including inversion, by a combination of horizontal, vertical, and oblique movements. 5. A hopper for receiving a certain amount of crushed sand sample from the sampling means is provided in the reducing means, and a drying means comprising a flat-plate electric heater is attached to a peripheral wall of the hopper, and the drying means is connected to the drying means. 3. An automatic particle size measuring device for sand according to claim 2, wherein said separating means is integrated with said separating means. 6. A vibrating feeder for feeding a fixed amount of crushed sand sample from the sampling means is provided in the reducing means, and a hot air drier or a flat plate electric heating element is attached to the vibrating feeder. 3. The automatic particle size measuring apparatus for sand according to claim 2, wherein said reducing means is integrated with said reducing means. 7. A casing comprising a sealed container provided in the middle of the product crushed sand feeding chute disposed substantially vertically, and a vertical shaft provided vertically through the casing. Receiving a crushed sand sample supported on the vertical axis and reversibly rotatable at a constant rotation angle about the vertical axis and provided in the casing and capable of taking in a part of the product crushed sand passing through the product crushed sand feeding chute. And a crushed sand sample intake container, the top end of which is formed in a slit-like intake opening whose longitudinal dimension in the radial direction with respect to the vertical axis is significantly longer than the lateral dimension in the direction perpendicular to the vertical axis. A bottom wall portion facing the mouth is formed on an inclined wall having a downward slope toward the vertical axis side, and the intake port is connected to the chute on the top wall portion of the casing and is a product sand crusher. The vertical axis is provided so as to be able to reciprocate by traversing at a position directly below the inlet, and the vertical axis communicates with the inside of the crushed sand sample receiving container at a portion from a middle portion to a lower end portion including a support portion of the crushed sand sample receiving container. 3. The automatic particle size measuring device for sand according to claim 1, wherein the automatic particle size measuring device for sand is formed on a hollow shaft and serves also as a crushed sand sample discharge pipe for collecting and discharging the crushed sand sample taken in the crushed sand sample receiving container. 4. 8. A drying chamber for receiving a crushed sand sample from the sampling means and vertically layering a fluidized bed and a stationary bed while receiving the crushed sand sample from the sampling means, and drying by introducing hot air for drying from below; 3. The automatic particle size analyzer for sand according to claim 2, further comprising a flow / vibration drier comprising: a vibrating device for applying a vibration to the dried and crushed sand sample to guide it to the sample outlet. 9. A funnel arranged vertically with a cylindrical portion for receiving a certain amount of crushed sand sample from the preceding stage, and a coaxial shaft at a lower portion of a lower end outlet of the cylindrical portion. A vertically provided crushed sand sample introduction pipe, and the lower end outlet is obliquely intersected with the cylindrical section so as to block the lower end outlet immediately below, and is rotatably provided between the tubular section and the crushed sand sample input pipe. In order to discharge the crushed sand sample falling on the disk from the lower end outlet to the side, the disk intervenes diagonally with the cylindrical portion and the crushed sand sample input conduit with the disk interposed immediately below the lower end outlet. And a crushed sand sample discharge pipe provided so as to form a disk.The disk is formed by a disk having a center as a rotation center, extends from the circumference toward the center, and is equally divided into a predetermined number. There is a notch corresponding to the shape,
9. The automatic particle size measuring device for sand according to claim 7, wherein the device is provided such that the lower end outlet can be blocked by a circular peripheral portion including the cutout portion. 10. 10. A discharge means is provided in connection with a weighing pan mounted on a weighing table below the automatic sieving particle size measuring means, for tilting the weighing pan and lifting it from the weighing table. The lifting longitudinal actuator and the lifting short actuator that simultaneously raise and lower the front and rear, left and right sides of the weighing pan, and the other side on the opposite side with different lifting strokes, and lift the weighing platform to weigh During the discharging operation in which the pan is inclined, the open state where the lower part is opened due to the effect of the crushed sand sample which is going to slide down the measuring pan is maintained, and in the measuring operation in which the measuring pan is mounted horizontally on the weighing platform, the inside of the measuring pan is maintained. A weighing pan is provided to be openable and closable with the peripheral plate on one side or the other side so that the lower part is kept closed without being affected by the crushed sand sample deposited on the measuring pan. And an exit gate.
Or the automatic particle size measuring device for sand according to 9.