JPH0328900Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a mixing device for powder and granular materials (powder and granular materials or a mixture of powder and granular materials), and particularly for mixing dry sand in a sand factory. The present invention relates to a mixing device suitable for use as a device for mixing sand and wet sand.

[Prior Art] In a sand factory, in order to provide sand with an optimum particle size distribution as ready-mixed concrete sand, a plurality of sands are mixed in a required ratio and shipped. As raw materials for this sand, sand obtained by removing salt from sea sand due to the depletion of river sand in recent years, and sand obtained by washing and classifying natural sand (hill sand), crushed sand, etc., are also used as raw materials.

[Problems to be solved by the invention] Conventionally, various mixers have been used to mix raw material sand, but the mixed state of different types of sand is uneven, which tends to cause quality control problems. In particular, when sand containing water (wet sand) and dry sand are mixed, unevenness tends to occur in the mixed state. As mentioned above, the proportion of sea sand that has been treated to remove salt, natural sand that has been washed with water, crushed sand, etc. has been increasing in recent years. When mixed with dry sand, significant unevenness tends to occur in the mixed state.

[Means for Solving the Problems] The powder and granule mixing device of the present invention supplies dry powder and wet powder onto a conveyor, and uses a scraper disposed on the conveyor to pre-mix the powder and granules. After thorough mixing, the mixture is introduced into a trommel equipped with a lifter for final mixing and sieving.

[Function] In the mixing device of the present invention, the moisture in the wet powder is dispersed by being premixed on the belt conveyor so that it permeates into the dry powder, and the distribution of moisture is preliminarily made uniform. do. In addition, during this preliminary mixing, some of the powder and granules may be in the form of lumps (so-called dumplings) with the wet material as the core and the dry material attached around it.
This may happen.

The raw material on this belt conveyor is then introduced into a trommel equipped with a lifter, where it is stirred to crush lumps and mix the wet material and dry powder more uniformly, and then sieved by the trommel. .
As a result, a mixed powder and granular material having an even mixed state and a uniform moisture content can be obtained.

[Examples] The present invention will be described in more detail below with reference to embodiments shown in the drawings.

FIG. 1 is a system diagram showing the configuration of an example device in which the present invention is applied to a mixing device for dry sand and wet sand.
FIGS. 2 to 7 are configuration explanatory diagrams showing enlarged main parts of the apparatus.

From the most upstream side of the belt conveyor, which is indicated by reference numeral 10 in FIG.
a hopper 12 for charging dry sand, a first scraper 14 for scraping dry sand, a device for charging wet sand, and a second scraper 16 for preliminary mixing of dry sand and wet sand. It is provided. The wet sand feeding device includes a hopper 18 and a conveyor 20 disposed below the hopper 18. As shown in an enlarged view in FIG. The wet sand is cut out by the conveyor 20. Reference numeral 18b in FIG. 2 indicates an opening adjustment device for the gate 8a;
18c indicates a drain port.

As shown in FIGS. 3 and 4, in this embodiment, the first scraper 14 is shaped like a triangular prism and is placed at the center in the width direction of the conveyor 10. The dry sand is scraped on both sides by the scraper 14,
A groove is formed in the center. Wet sand is then thrown into this groove from the conveyor 20. In this embodiment, the scrapers 16 are arranged in a V-shape to scrape the dry sand scraped on both sides toward the center, and scrapers 16a and 16b are arranged in a V-shape to scrape the dry sand scraped on both sides toward the center. Triangular prism-shaped scrapers 16c, 16 arranged at the closer portions
d, scrapers 16e and 16f arranged in a V-shape in order to scrape the sand scraped by these scrapers 16c and 16d toward the center again;
It is equipped with

As shown in FIG. 1, the conveyor 10 is arranged so that its input section faces the input port 22A of the trommel 22 shown in FIGS. 6 and 7. The trommel 22 includes a rotatable drum 22a arranged at an angle and a wire mesh cylindrical body 22b, and a lifter 22h is provided protruding inside the drum 22a. A hopper 22c is installed below the wire mesh cylindrical body 22b to collect sand that has passed through the mesh openings. Further, a discharge chute 22d is provided on the opposite side of the wire mesh cylindrical body 22b from the input port 22A for discharging coarse sand, coarse garbage, etc. that have not passed through the wire mesh. Reference numeral 22e indicates a motor for driving the trommel, and 22f and 22g indicate bearings.

A conveyor 24 is arranged below the hopper 22c, and a conveyor 26 is arranged below the discharge chute 22d.

In the mixing device configured in this way, the amount of dry sand to be cut out is set by the gate 12a,
It is cut out by the conveyor 10. The sand is then scraped in two rows by the scraper 14 to form a sand groove in the center of the conveyor. The amount of wet sand to be cut out is set by the gate 18a, and the wet sand is cut out by the conveyor 20 and thrown into the above-mentioned dry sand groove. Next, the sand is preliminarily mixed on the conveyor 10 by a scraper 16, and the moisture in the wet sand is diffused as it soaks into the dry sand. In addition, during preliminary stirring using this scraper 16,
A portion of the wet sand becomes a core and the dry sand adheres around it, forming a lump-like shape. The sand preliminarily mixed on this conveyor 10 is fed into the trommel 22 and further mixed. At this time, the lifter 22
Dumpling-like lumps are also broken down and mixed well. In the trommel 22, the sand passes through the mesh of the wire mesh cylinder 22b, falls into the hopper 22c, and is conveyed to the yard 28 by the conveyor 24. Rough sand and garbage discharged from the chute 22d are sent to the yard 30 via a conveyor 26.

Since the sand sent to the yard 28 has been preliminarily mixed on the conveyor 10 and then sufficiently mixed in the trommel 22 equipped with a lifter, there is no unevenness in the mixed state. The distribution of moisture has also become uniform. In addition, it is of extremely high quality, with coarse sand and debris removed by the trommel 22.

In the above embodiment, the scrapers are arranged in two stages, front and rear, and the upstream scraper 14 scrapes the sand to form a groove, and after pouring wet sand into the groove, the second scraper 16 scrapes the sand. By stirring, the dry sand and wet sand are mixed very well. However, in the present invention, the scraper only needs to be installed downstream of the wet sand input section.
The first scraper 14 may be omitted. Further, various shapes other than those shown in the drawings may be used as scrapers. Furthermore, the wet sand may be fed onto the conveyor upstream of the dry sand.

The above embodiment was applied to mixing dry sand and wet sand, but the present invention is applicable to various types of dry powder and wet powder, or powder with low moisture content, such as a mixing device for dry grain and wet grain. It can also be used as a mixing device for granules and powder with a high water content.

[Effects of the invention] As described above, according to the mixing device of the present invention, a granular material in which a wet granular material and a dry granular material are evenly mixed can be obtained. The mixing device of the present invention has a relatively simple configuration mainly consisting of a conveyor belt, a scraper, a trommel, etc., and the device construction cost is low and can be widely used.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of the present invention, FIG. 2 is a vertical sectional view showing the structure of the lower part of the hopper 18, and FIG. 3 is a perspective view showing the structure of the main parts on the conveyor 10.
4 is a plan view of the same, FIG. 5 is a cross-sectional view taken along the line of FIG. 3, FIG. 6 is a side view of the trommel, and FIG. 7 is a cross-sectional view taken along the line of FIG. 6. 10...Conveyor, 12...Hopper, 14,1
6... Scraper, 18... Hopper, 20... Conveyor, 22... Trommel, 22h... Lifter, 24, 26... Conveyor.

Claims (1)

[Scope of Claim for Utility Model Registration] A trommel with a lifter projecting therein, a conveyor for feeding raw materials into the trommel, means for providing wet granular material on the conveyor, and a dry granular material on the conveyor. A scraper for mixing dry powder and granular material arranged on the conveyor, and a scraper for mixing dry powder and granular material.