JP2655174B2 - Bulk density measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a. Industrial Field of the Invention The present invention relates to an apparatus for measuring the bulk density of granular materials, especially artificial lightweight aggregates and cement clinkers suitable for use in the cement manufacturing process.

b. Conventional technology In the cement manufacturing process, the measurement of the bulk density of the cement clinker is generally performed as a means of firing and controlling the cement clinker. Conventionally, the bulk density is measured manually by taking a sample in a badge.

c. Problems to be solved by the Invention Since the bulk density depends on the particle size, reproducible measurement cannot be performed unless the particle size is fixed.
Sampling must also be performed so that what is obtained by the operation of keeping the particle size constant reflects the characteristics of the population.

On the other hand, the granular material to be measured varies in both the particle size distribution and the flow rate. Therefore, it was difficult to measure the bulk density continuously.

An object of the present invention is to propose a bulk density measuring device capable of continuously measuring the bulk density of a granular material.

d. Means for Solving the Problems The problems described above include a sample collecting means for collecting a predetermined amount of a sample from a flow of granular material at predetermined time intervals, a reducing means for reducing the collected sample, and a reducing means. A sample supply device for sending the divided sample to the sieve means at a substantially constant flow rate, a sieve means for passing only particles between a predetermined minimum particle size and a predetermined maximum particle size, and a fixed capacity arranged below the sieve means A weighing hopper having an upper surface of the weighing hopper, the lower surface of which is substantially the same as the upper surface of the weighing hopper, and the upper surface and the lower surface of which are substantially frustoconical, or A substantially cylindrical slotting hopper, a power cylinder for the slotting hopper for horizontally moving the slotting hopper, and a weighing hopper for inverting the weighing hopper around a horizontal axis for discharging the sample in the weighing hopper. Rotary drive and A weighing hopper, a weight measuring load cell for measuring the weight of the sample in the weighing hopper, an output means for outputting a ratio of an output of the weighing load cell to a volume of the weighing hopper, and a hopper on the weighing hopper. The weighing hopper and the slotting hopper are filled with the granules in the state where the weighing hopper is horizontally moved, and then the weighing hopper is horizontally moved to perform the slicing operation. The problem has been solved by a bulk density measuring device comprising a control having a sequence for discharging a sample.

e. Action Since the granules that have passed through the sieving means that passes only the granules between the predetermined minimum particle size and the predetermined maximum particle size have a substantially constant particle size, reproducibility can be obtained in the bulk density measurement.

After the granules are filled in the weighing hopper and the slotting hopper, the top surface of the sample in the weighing hopper can be reliably flattened by moving the slotting hopper horizontally.

By the operation of the control unit, the weight of the sample in the weighing hopper is measured in a state where the top surface is cut off, and this is automatically repeated. Therefore, the bulk density of the sample is measured almost continuously.

f. Embodiment FIG. 1 is a conceptual elevation view of a bulk density measuring apparatus according to the present invention.

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

One or a plurality of dichotomers 4 are arranged in series below the sampler 3. The dichotomizer is a chute having a rectangular cross section as shown in a perspective view in FIG. 2, and has a partition plate for uniformly guiding the cross section of the cross section to two discharge chutes, and passes through the partition plate. The sample thus obtained is alternately led to two discharge chutes 4b and 4c. By adjusting the number of bisectors arranged in series, it is possible to always take an optimal amount of a sample even if the flow rate of the granules fluctuates in a wide range.

The sample collected by the sampler 3 and divided by the binarizer 4 is temporarily stored in a hopper 5 having a sufficient capacity. The sample is supplied to the succeeding rotary sieve at a substantially constant flow rate by the vibrating feeder 6 arranged below the hopper 5.

The rotating sieve 7 is a rotating cylindrical body, and is provided with a net 7b having a small-diameter hole in a portion of the cylindrical surface near the sample inlet 7a, and a net 7c having a large-diameter hole in a portion far from the sample inlet. I have. The granules passing through the small-diameter holes 7b are the first discharge chute on a rotary sieve.
The granules discharged from 7d and passing through the large-diameter hole 7c are turned into a second rotary sieve.
The particles discharged from the discharge chute 7e and not passing through the large-diameter hole 7c are discharged from the third discharge chute 7f of the rotary sieve. Therefore, the particles discharged from the rotary sieve second discharge chute 7e are:
It has a particle size between the minimum and maximum values defined by the small hole mesh and the large hole mesh.

A slotting hopper 8 and a weighing hopper 9 are provided below the rotary chute second chute 7e. The slotting hopper 8 can be moved horizontally by a slotting hopper power cylinder 10, and when the hopper 8 is filled with particles, the slotting hopper is located above the weighing hopper 9. The granules are filled into the weighing hopper 9 and the slotting hopper until the granules overflow from the notch 7g provided at the lower part of the chute 7e. Thereafter, using the slotting hopper power cylinder 10, the slotting hopper is horizontally moved to remove excess particles. That is, a sample of a fixed volume defined by the capacity of the weighing hopper is obtained.

The weight of the granules in the weighing hopper and the weighed hopper is measured using the load cell 11 for weight measurement. After that, the weighing hopper is inverted by 180 ° about the horizontal axis using the weighing hopper rotation drive device 12, and the weighing hopper is weighed again using the load cell 11, and the difference is obtained. Since the weight of the weighing hopper is constant, the weight of the weighing hopper can be stored in a memory in advance. Since the volume of the weighing hopper 9 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 control unit (not shown).

g. Effect of the Invention The bulk density of the granular material can be automatically measured with good reproducibility.

[Brief description of the drawings]

FIG. 1 is a conceptual elevation view of a bulk density measuring apparatus according to the present invention, FIG. 2 is a perspective view of a bisection, and FIG. 3 is a conceptual sectional view of a sample measuring section. 1 ... bucket elevator, 2 ... power cylinder, 3 ... sampler, 4 ... divider, 5 ... hopper, 6 ... vibration feeder, 7 ... rotary sieve, 8 ... slipper hopper, 9 ... Weighing hopper, 10 ... Power cylinder for slotting hopper, 11 ... Load cell, 12 ... Weighing hopper rotation drive.

Claims (1)

(57) [Claims] 1. A sample collecting means for collecting a predetermined amount of a sample from a flow of particulate matter at a predetermined time interval, a reducing means for reducing the collected sample, and a substantially constant flow rate of the reduced sample. A sample supply device for sending to the sieve means, a sieve means for passing only particles between a predetermined minimum particle size and a predetermined maximum particle size, a weighing hopper arranged below the sieve means and having a certain capacity, and an excess sample Horizontal movement is possible along the upper surface of the weighing hopper to remove, the lower surface is almost the same shape as the upper surface of the weighing hopper,
An approximately frusto-conical or substantially cylindrical slotting hopper having an open top and bottom, a slotting hopper power cylinder for horizontally moving the slotting hopper, and a weighing hopper for discharging the sample in the weighing hopper. Weighing hopper rotation drive for reversing around the horizontal axis, weighing hopper and weighing load cell for measuring the weight of the sample in the weighing hopper, and the ratio of the output of the weighing load cell to the volume of the weighing hopper An output means for outputting the weighing hopper and the slicing hopper in a state where the slicing hopper is arranged on the weighing hopper, and then the weighing hopper is horizontally moved to perform the slicing operation. A bulk density measuring device comprising a control unit having a sequence for measuring the weight of a weighing hopper and then inverting the weighing hopper and discharging a sample.