JPH079323A - Sand polishing process device and using method therefor - Google Patents

Abstract

PURPOSE:To improve the antiabrasive property of a device by welding and setting metallic rods to the side wall and the bottom surface of a spiral groove, and to the inner surface of a V-shaped blade plate installed in the groove, in an adequate interval in the direction crossing the spiral groove. CONSTITUTION:As the parts metallic rods are welded, the parts exposed to the flow of sand, that is, the bottom 2 of a spiral groove, the side wall 1 of the groove, and the inner surface of a V-shaped blade plate 3 installed to the inside of the groove are used. And the V-shaped blade plate 3 is provided in the spiral groove, and it gives an effect to make the friction among the sand grains stronger by combing and churning the sand when the sand runs in the spiral groove following the rotation of a drum. By setting steel rods inside the spiral groove and the V-shaped blade plate in such a way, the operation for about 5 years can be realized with no repairing. Therefore, not only the service life of the device is extended and the repairing cost is reduced, but also the additional effect to improve the quality of the sand after the polishing process is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to produce a high quality concrete aggregate by polishing and refining mountain sand whose surface of sand particles is covered with clay, weathering film, etc. Due to continuous use in the filtration device, foreign components are deposited on the surface,
The present invention relates to an apparatus used for polishing the surface of sand used for polishing, regenerating, and activating contaminated sand to be solidified, discarded, and replaced, and a method of using the apparatus.

[0002]

BACKGROUND OF THE INVENTION The present invention relates to an improvement of a "sand sand polishing machine" according to Japanese Patent Publication No. 59-35744. As described in detail at the beginning of the same specification, the processing machine polishes clay particles, diatomaceous earth, and organic components adhering to the surface of mountain sand, which is almost worthless, by friction between particles and a mixing action. It is a device to obtain concrete sand comparable to high quality river sand,
It has been operating successfully since 1982 and has produced 50,000 to 60,000 tons of gravel and sand. However, as the operating rate of the device improved and as the research of new uses of the device progressed, points were found to be improved.

[0003]

What is to be improved is a measure for improving the wear resistance of the device. That is, the device can remove sand with a small amount of water, or simply wet it.
Since it moves along a spiral groove provided inside the rotating drum, and the particle surface is polished by the friction effect between the sand particles therebetween, the sand is polished and the device itself is notably worn. It was The sites of significant wear were the inner surface of the rotary drum (bottom and wall of the spiral groove), the inner surface of the V-shaped vane plate provided in the spiral groove, and the vicinity of the tip. As a countermeasure against this wear, rubber lining has been applied to each main part and the iron plate has been made thick to use, but repairs were required every 3 to 6 months.

[0004]

As described above, in order to improve the wear resistance of the apparatus, as a result of various trials, the side wall 1 and the bottom surface 2 of the spiral groove 2, and the V-shaped vane plate 3 mounted in the groove are obtained. This was solved by welding and installing metal rods on the inner surface (side wall 7 and bottom surface 4) of the metal at appropriate intervals in the direction traversing the spiral groove.

[0005]

In the case of the device constructed as described above, the device is operated by the action of the metal rods (generally made of iron) provided at appropriate intervals so as to traverse the sand flow path. Mud and sand accumulate within the space between these rods on the inner surface, and the lining is made with mud and sand. As a result, the impact force and wear force due to the heavy sand flow do not reach the inner surface of the device directly. It is understood that the amount of wear is significantly reduced. Although the true mechanical explanation of the reduction in the amount of wear has not yet been clarified, the present invention is based on the fact that the device according to the above-described structure has a significantly reduced amount of wear.

If the above structure is further applied here, various metal rods are used as the metal rods, but steel rods (diameter 5 to 15 mm) are mainly used for economic reasons.
Welded at intervals of ~ 100 mm. This distance is 30mm
The following may be used, but the welding work is complicated and the processing cost is high. Further, if it is 100 mm or more, the lining of sand or mud is interrupted and the inner surface (iron portion) of the device is exposed, so that the effect of installing steel bar is diminished. After trial, 100 mm or less was selected. Within this range, the most preferable interval is 50 to 70 mm.

The welded portion of the steel bar is the portion exposed to the sand flow, that is, (a) the bottom portion 2 of the spiral groove.
(B) Part that forms the side wall of the groove (partition plate) 1, (c)
It is provided on the inner surface of the V-shaped vane plate 3 (bottom portion 4 and side wall 7) mounted in the groove. These are attached by welding.

Next, the V-shaped vane plate 3 is installed in the spiral groove, and when the sand runs in the spiral groove as the drum rotates, the sand is scraped up and agitated to cause friction between the sand grains. It has the effect of increasing the intensity.

Various shapes shown in FIGS. 2 (a) to 2 (e) are appropriately selected according to the properties of sand, particle size and the like. These V-shaped vanes are
It is made slightly smaller (m), and the blade plate outlet part has a narrower width (n) or a pointed shape in order to speed up sand flow and vigorous stirring. When it is installed in the spiral groove, it is fixed by welding or bolt nuts 8 and 8 '.

As described above, by installing the steel bars in the spiral groove and in the V-shaped vane, the wear of the apparatus is remarkably reduced, and the operation for about 5 years becomes possible with almost no repair. This not only has the effect of prolonging the life of the apparatus and reducing the repair cost, but also has the secondary effect of improving the quality of the sand after the obtained polishing treatment.

As described in detail at the beginning of the specification of the prior application (Japanese Patent Publication No. 59-35744), the sand polishing apparatus according to the present invention first produces high-quality concrete aggregate from mountain sand containing a large amount of impurities. It can be used for the purpose. The obtained sand did not contain fine powder or organic components, and the reddish brown color due to iron oxide, etc. was also thin, and it was possible to obtain sand that is suitable for aggregates. By improving the wear resistance of the device according to the present invention, the utility of the device of the present invention can be further enhanced in combination with the effect of improving the operating rate, improving the quality, and reducing the device repair cost.

The apparatus of the present invention is not only used for the purification of the above-mentioned mountain sand, but also for the production and filtration of the sand to be filled in the sand filter for the purification of the tap water or the industrial source water. It can also be used for reclaiming sand.

Recently, the quality of the source water has been decreasing year by year due to the national pollution of the water intake source. These are usually subjected to a secondary treatment by adding a chemical agent such as various coagulants and / or a sterilizing agent and subjecting them to a primary treatment by a sedimentation method or a filter-press method, and then applying them to a sand filter. . In this case, the sand in the filtration device gradually remains slightly organic (for example, algae) or inorganic (for example, fine clay colloid).
It becomes dirty, and clogging reduces the filtration speed. It used to be rich in good quality river sand, but recently it has been cleaned and reused more often. The apparatus according to the present invention can be used at the time of initial filling preparation of such sand for sand filtration or for reclaiming treatment. In particular, iron and manganese components, etc., which adhere firmly and are difficult to remove by the ordinary method, can be removed extremely efficiently.

Specific embodiments of the apparatus according to the present invention will be described below with reference to embodiments.

[0015]

【Example】

(Embodiment 1) One spiral groove having a width of 45 cm is provided inside a rotary drum made of high-tensile steel having an inner diameter of 3 m and a length of 8 m shown in FIG. The sand, which is wet with water, enters from one end, flows in the spiral groove as shown in FIG. 5, and is discharged from the other end. Vane plate 3 [in the case of this example, FIG. 2, (c) (L = 4
5 cm, m = 40 cm, n = 15 cm) type] 1
Forty-five pieces were attached. In the spiral groove and the V-shaped vane,
As shown in the figure, steel rods (diameter 12 mm) were attached by welding at 6 cm intervals. This rotary drum was chain driven by a 45-horsepower motor.

In the case of the device of the present invention, due to the effect of attaching the steel bar provided on the inner wall of the sand flow path, there is no repair work due to wear or perforation of the device for about 5 years, and compared with the conventional device without the steel bar attachment It is a surprising fact that the durability was improved about 10 times or more.

The sand polished by this device is separately washed with a large amount of water by washing, stirring, floating, settling, tilting, sieving and the like to remove the finely pulverized sand component and polishing. It removes mud and organic impurities. For concrete aggregates, it is usual to select the particle size range defined by the standard of sand and gravel, and for water filtration, the particle size range defined by JWWA (Edited by Japan Water Works Association) is usually selected.

Comparing the sand obtained by the polishing apparatus with the sand used as the raw material before the treatment, the particle size depending on the treatment is
From the analysis value and the enlarged photograph, it was clear that the shape, gloss and impurities were good after the treatment.

(Example 2) The apparatus according to the present invention was applied to the purification process of sand for a sand filter. A concrete tank with a width of 5 m and a length of 10 m is laid with 1 m of filtering sand and aerated,
Oxidized groundwater was filtered and used for simple industrial water purification. Since the filtration speed decreased by 0.6 m / day after continuous use for about 2 years by the slow filtration method, the sand was regenerated by the device of the present invention.

Polishing treatment was carried out while continuously supplying the above sand to the apparatus of the present invention. The average retention time of sand is 20
After treatment for ˜25 minutes, the particles were washed with water by a tilting method, and the particle size was selected using a sieve with a mesh size of 2.0 mm (maximum side) and 0.15 mm (minimum side). When the sand after the treatment was filled and the water was filtered, the filter speed was recovered to 8.3 m / day. By polishing with this device, visual observation of the shape and hue by magnified photographs showed that organic matter, clay, fragile sand, etc. were removed, and the aspect ratio (major axis / minor axis ratio) was good. . The sand is evaluated by JWWA [Japan Water Works Association, A103-1988: 21, 47],
The standard of sand for sand filtration was referred to.

[0021]

INDUSTRIAL APPLICABILITY The present invention relates to an improvement of a sand polishing apparatus by rotating a drum having a spiral groove and a V-shaped vane plate on the inner surface thereof. The abrasion resistance due to sand on the inner surface was significantly improved.

Further, this sand polishing apparatus was used for obtaining high quality concrete aggregate sand and gravel from the conventional use of mountain sand, and good results were obtained.

[Brief description of drawings]

FIG. 1 shows a state in which steel bars are provided at intervals on the inner surfaces of a spiral groove and a V-shaped vane plate of the device of the present invention.

FIG. 2A to FIG. 2E are examples of V-shaped vanes having different structures and shapes.

FIG. 3 is an overall conceptual diagram of a sand polishing processing apparatus according to the present invention.

FIG. 4 is a development view of an inner surface of a rotary drum.

FIG. 5 is a schematic diagram illustrating movement of sand flowing in a spiral groove.

[Explanation of symbols]

 1 spiral groove side wall (partition plate) 2 spiral groove bottom plate 3 V-shaped blade plate side wall 4 V-shaped blade plate bottom 5, 5'steel bar provided on the inner surface of the spiral groove 6, 6'steel bar provided on the inner surface of the blade 7 V-shaped blade Plate side wall 8,8 'V-shaped vane plate mounting bracket 11 Rotating drum driving chain 12 Rotating drum peripheral wall (spiral groove bottom plate) M Driving motor L V-shaped vane length m V-shaped vane sand Width of inlet n V-shaped vane sand Width of outlet

Claims (2)

[Claims] 1. A spiral partition plate is fixed to the inner circumference of a cylindrical rotary drum having a sand, gravel and water inlet on one end and an outlet on the other end, and the partition is fixed to the inner periphery of the drum. In a sand polishing apparatus, wherein a V-shaped vane plate is installed in a spiral flow path groove divided by a plate;
The bottom surface of each spiral groove (the inner peripheral surface of the rotary drum), the wall surface of the partition plate forming the side wall of the spiral groove, and the V provided on each spiral groove.
Weld a rod-shaped metal body on the inner surface of the V-shaped vane plate at appropriate intervals in the transverse (vertical) direction to the flow direction of each groove,
A sand polishing device with the installed structure. 2. A spiral partition plate is fixed to the inner circumference of a cylindrical rotary drum having an inlet for sand, gravel and water on one end surface and an outlet on the other end surface. In a sand polishing apparatus characterized in that a V-shaped vane plate is installed in a spiral flow path groove divided by a partition plate; the bottom surface of each spiral groove (inner peripheral surface of a rotary drum), the side wall of the spiral groove. Welding rod-shaped metal bodies on the wall surface of the eggplant partition plate and the inner surface of the V-shaped vane plate provided in each spiral groove at appropriate intervals in the transverse (perpendicular) direction to the flow direction of each groove, Sand polishing treatment equipment with added structure ”; sand preparation work for initial filling of sand filter for purification of tap water or industrial source water, or regeneration of contaminated sand by continuous use of the filter How to use the sand polishing equipment used for activation work.