JPH0235333A - Bulk-density measuring apparatus - Google Patents

Abstract

PURPOSE:To measure the bulk density of granular material automatically in good reproducibility by providing a constitution wherein shieve means which pass the granular material of a specimen only within a range between the specified minimum grain size and the specified maximum grain size are communicated and the granular material having the approximately constant grain size is obtained. CONSTITUTION:The specimen of granular material is picked up with a sampler 3 by using a power cylinder 2 and reduced through a riffle sampler 4. The specimen is once stored in a hopper 5 having a sufficient capacity. The specimen is supplied into a succeeding rotary shieve 7 by an approximately constant flow rate through an oscillating feeder 6 that is arranged at the lower part of the hopper 5. The rotary shieve 7 is a rotating cylinder body and provided with the following parts: a net 7b having small-diameter holes which is provided at a part in the vicinity of a specimen input port 7a of the cylinder surface; a net 7c having large-diameter holes which is provided at a part remotely separated from the input port of the specimen; and a third discharge chute 7f which discharges grains that do not pass through even the large-diameter holes. The grains which are discharged through a second discharge chute 72 are grains having the diameters within the specified range value.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Industrial Application Field The present invention relates to a device for measuring the bulk density of granular materials, particularly artificial lightweight aggregates and cement clinkers suitable for use in cement clinker manufacturing processes.

b. Prior Art In the cement manufacturing process, the bulk density of cement clinker is generally measured as a means of controlling the degree of calcination of cement clinker. Traditionally, the bulk density has been measured manually by taking samples using the hajj method.

C8 Problems to be Solved by the Invention Since bulk density is a quantity dependent on particle size, reproducible measurements cannot be made unless the particle size is constant. In addition, samples must be taken so that the results of the particle size control process reflect the characteristics of the population.

On the other hand, regarding the particle size distribution of the granular materials to be measured,
The flow rate also varies. Therefore, it was difficult to continuously measure the canopy density.

An object of the present invention is to propose a bulk density measuring device that can continuously measure the bulk density of granules.

d. Means for solving the problem The above problem consists of a sample collection means for collecting a predetermined amount of a sample from a flow of granular materials at predetermined time intervals, a reduction means for reducing the collected sample, and a reduction method. a sample supply device that sends the separated sample to a sieve means at a substantially constant flow rate; a sieve means that passes only particles between a predetermined minimum particle size and a predetermined maximum particle size; a weighing hopper having a horizontal movement along the upper surface of the weighing hopper to remove excess sample, the lower surface being approximately the same shape as the upper surface of the weighing hopper;
A slitting hopper having an approximately truncated conical or cylindrical shape with open top and bottom surfaces, a power cylinder for the slitting hopper to horizontally move the slitting hopper, and a weighing hopper for discharging the sample in the weighing hopper. A weighing hopper rotation drive for inversion around a horizontal axis, a weighing hopper and a weighing load cell for measuring the weight of the sample in the weighing hopper, and a ratio of the output of the weighing load cell to the volume of the weighing hopper. and a slitting hopper placed above the weighing hopper, the weighing hopper and the slitting hopper are filled with particles, and then the weighing hopper is moved horizontally to perform the slitting operation, and the slitting hopper is placed above the weighing hopper. The problem was solved by a bulk density measuring device equipped with a control section that measures the weight of the weighing hopper in the state, and then inverts the weighing hopper and discharges the sample.

e. Effect Since the particle size of the particles passing through the sieving means that passes only particles between a predetermined minimum particle size and a predetermined maximum particle size is approximately constant, reproducibility can be obtained in bulk density measurement.

After filling the weighing hopper and the slicing hopper with granules, the slitting hopper is moved horizontally to ensure that the top surface of the sample in the weighing hopper is flat.

By the operation of the control section, the weight of the sample in the weighing hopper is measured with two sides cut off, and this process is automatically repeated. Therefore, the bulk density of the sample is measured almost continuously.

f. Example FIG. 1 is a conceptual elevational view of a bulk density measuring device according to the present invention.

A sampler 3 is inserted into a flow of particles flowing out from a bucket elevator 1 for a predetermined time using a power cylinder 2. The sampler 3 collects a sample by cutting part of the flow of granules, and the collected granules are continuously discharged from a discharge chute. By adjusting the insertion depth and insertion time of the sampler, any amount of sample can be collected.

Below the sampler 3 one or more bisectors 4 are arranged in series. As shown in a perspective view in FIG. 2, the bisecting machine is a sheet having a rectangular cross section, and has a partition plate for dividing the cross section evenly and guiding the granules to two discharge chutes, Two ejection shoes 1 to 4b alternately discharge the sample that has passed through the partition plate.

Leads to 4c. By adjusting the number of bisectors arranged in series, it is possible to always collect the optimum amount of sample even if the flow rate of the granules varies over a wide range.

The sample collected by the sampler 3 and reduced by the bisector 4 is temporarily stored in a bonnet 5 having a sufficient capacity. The sample is supplied to the following rotary sieve G at a constant flow rate by a vibrating feeder 6 disposed at the bottom of the soba 5.

The rotary sieve 7 is a rotating cylindrical body, and a screen 7b having small-diameter holes is provided at a portion of the cylindrical surface near the sample lower a, and a screen 7c having large-diameter holes is provided at a portion far from the sample inlet. ing. The granules that have passed through the small-diameter hole 7b are discharged from the rotary sieve first discharge chute 7d, and the granules that have passed through the large-diameter hole 7c are discharged from the rotary sieve second discharge chute 7e and are discharged from the large Particles that do not pass through the holes 7c of the diameter are discharged from the third discharge chute 1 to 71 of the rotary sieve.Therefore, the grains discharged from the second discharge chute 7e of the rotary sieve are separated by the mesh of small diameter holes and the mesh of large diameter holes. having a particle size between the minimum and maximum values defined by .

A slitting hopper 8 and a weighing hopper 9 are arranged below the rotary sieve second chute 7e. The slitting hopper 8 can be horizontally moved by a slitting hopper power cylinder 10, and when filling the hopper 8 with grains, the slitting hopper is located at the second part of the weighing hopper 9. The weighing hopper 9 and the slitting hopper are filled with granules until they overflow from the notch 7g provided at the bottom of the chute 7e. Thereafter, the power cylinder 10 for the slitting hopper is used to horizontally move the slitting hopper to remove excess granules. That is, a sample with a constant volume defined by the capacity of the weighing hopper is obtained.

The weight of the granules in the weighing hopper and the weighing hopper is measured using a weight measuring load cell 11. Thereafter, the weighing hopper is reversed by 180° about the horizontal axis using the weighing hopper rotation drive device 12, and the weighing hopper is again weighed using the load cell 11, and the difference therebetween is determined. Note that since the weight of the weighing hopper is constant, it is also possible to record the weight of the weighing hopper in the memory in advance. Weighing hopper 9
Since the volume of is constant, the weight obtained by subtracting the weight of the weighing hopper 9 is proportional to the bulk density of the sample. By calibrating the output of the load cell in advance, the bulk density of the sample can be obtained.

These steps are automatically repeated by a controller (not shown).

g. Effects of the invention The bulk density of granules can be automatically measured with good reproducibility.

[Brief explanation of the drawing]

FIG. 1 is a conceptual elevational view of a bulk density measuring device according to the present invention, FIG. 2 is a perspective view of a bisecting device, and FIG. 3 is a conceptual sectional view of a sample measuring section. 1... Packet elevator, 2... Power cylinder, 3... Sampler, 4...
・Bisection machine, 5...Hopper, 6...Vibration feeder, 7...Rotary sieve, 8...Slipping hopper, 9...Weighing soba, 10...For slitting hopper Power cylinder, 11... Load cell, 12... Weighing hopper rotation drive device.

Claims (1)

[Claims] A sample collection means for collecting a predetermined amount of sample from a flow of granular material at predetermined time intervals, a reduction means for reducing the collected sample, and sending the reduced sample to a sieve means at a substantially constant flow rate. a sample supply device, a sieve means for passing only particles between a predetermined minimum particle size and a predetermined maximum particle size, a weighing hopper disposed below the sieving means and having a constant capacity, and a weighing hopper for removing excess sample. A slitting hopper that can be moved horizontally along the top surface of the hopper, has a bottom surface that is approximately the same shape as the top surface of the weighing hopper, and has an approximately truncated conical or cylindrical shape with open top and bottom surfaces, and a slitting hopper that is horizontally movable along the top surface of the weighing hopper. A power cylinder for the slitting hopper for moving the weighing hopper, a weighing hopper rotation drive device for reversing the weighing hopper around a horizontal axis for discharging the sample in the weighing hopper, and A weight measurement load cell for measuring weight; an output means for outputting the ratio of the output of the weight measurement load cell to the volume of the weighing hopper; A control unit has a sequence of filling a hopper with granules, then moving the weighing hopper horizontally to perform a slitting operation, measuring the weight of the weighing hopper in that state, and then reversing the weighing hopper and discharging the sample. Equipped with a bulk density measuring device.