JPH0227019B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on a rotary rotary machine which is used to separate and collect precipitated sand from water and mud from the sand mixed water that is generated when soil excavated from riverbeds, etc. is washed and sorted with an aggregate classifier. Regarding the classifier.

Traditionally, it has been used as aggregate sand for concrete and asphalt roadbeds. A rotary classifier for collecting settled sand from rivers settles in a rotating drum that has a sand sampling port and a drainage port, uses scraping blades to scrape up the settled sand that is transported, and then drops it onto a delivery member such as a delivery conveyor. It is designed so that it can be guided out of the drum.

In this rotary classifier, during sand classification, the sand that settles at the bottom of the rotating drum is massaged to some extent by the action of the spiral blades as the rotating drum rotates, and impurities (low specific gravity) such as dirt and mud are removed. While doing so, it is carried out to the sand extraction port side. These impurities float to the surface and are transferred to the drain side and discharged out of the rotating drum along with the water. However, not only is the cleaning of the sand insufficient, but the settled sand still carries a large amount of moisture when it is removed by the raking blades. Not only is the sand collection efficiency low because the sand is raked up by the raking blades, but the water that accompanies the settled sand on the raking blades is only dehydrated by the water's own weight, that is, by gravity dehydration, so the dehydration condition of the sand is not good. There were flaws.

The present invention solves these conventional problems by transporting the settled sand in the rotating drum toward the sand sampling port using a spiral blade or the like, and washing and vibrating the sand in multiple stages. The structure is such that a large amount of sand with good cleaning and dewatering properties can be obtained.

That is, in the present invention, one of the openings on both sides of a rotating drum into which mixed water containing sand is input and the sand is precipitated at the bottom is a drainage port and the other is a sand sampling port, and the precipitated sand in the rotating drum is drained from the sand sampling port. The sand is transferred to the mouth side, and is raked up from the water by a plurality of raking blades provided radially on the inner surface of the rotating drum, and transferred to the ceiling so that it can fall, and the sand is then carried out to the outside of the rotating drum after receiving the falling sand. In the rotary classifier, an intermediate annular partition plate is provided in the drum concentrically with the drum to form at least two compartments, and each of these compartments has a raking blade and a raking blade. A conveying member for conveying the falling settled sand to the adjacent compartment or outside the drum is provided, and the entire circumference of the drum body at the portion where the raking blades are provided in each compartment is made of an elastic material or a flexible material. It is formed of a flexible material, and a mechanism for dewatering sedimented sand by repeated impact is provided on the outer surface of the bottom of each drum body, and a repetitive impact member or a pressing member is provided on the outer surface of the top of each drum body as a mechanism for promoting the fall of dehydrated sand. At the same time, a cleaning water supply mechanism capable of supplying cleaning water to the sand is installed in the compartment closest to the sand sampling port, and furthermore, the water in the compartment adjacent to the sand sampling port is configured to sequentially overflow toward the drain port. The rotary classifier is characterized in that an opening is formed in the intermediate annular partition plate.

Examples of the present invention will be described with reference to the drawings.
A first annular partition plate 2 is provided at one end of a horizontally installed rotating drum 1 (hereinafter referred to as drum), and a drain port 3 is provided.
However, a second annular partition plate 4 is provided at the other end to open each sand sampling port 5, and three intermediate annular partition plates are arranged on the inner wall of the drum 1 between the drain port 3 and the sand sampling port 5. By this arrangement, four compartments are formed within the drum 1. That is, by arranging the first intermediate annular partition plate 6, the second intermediate annular partition plate 7, and the third intermediate annular partition plate 8 in order from the drain port 3 toward the sand sampling port 5, the first section Room 9,
A second compartment 10, a third compartment 11, and a fourth compartment 12 are formed.

The diameters of the openings of these intermediate annular partition plates, the first annular partition plate 2, and the second annular partition plate 4 are made smaller in order from the drain port 3 side to the sand sampling port 5 side. The water level gradually decreases from the sand sampling port 5 side toward the drainage port 3 side.

A helical blade 13 for transferring settled sand toward the first intermediate annular partition plate 6 is provided protrudingly on the inner wall of the drum 1 in the first compartment 9, and at the end of the helical blade 13, and First intermediate annular partition plate 6
A first raking blade 1 which is a water-permeable plate-like member in contact with
4 are arranged in a radial manner, and furthermore, a raw water input chute 15 has a raw water input port connected to the first raking blade 1.
4, and a first chute 16 which is a water-permeable plate-like member for receiving sand falling from the first raking blade 14 and supplying it to the second compartment 10 is provided. .

The end portion of the first compartment 9 and the drum wall forming the second compartment 10 to the fourth compartment 12 are made of an elastic material or a flexible material such as a rubber plate, a plastic plate, or a spring steel over the entire circumference. It is made of a steel plate or the like (hereinafter, this portion of the drum wall will be referred to as an elastic ring 17). In addition, regarding the first compartment 9, this elastic ring 17 is provided only at the location where the first raking blade 14 is provided.

Inside these second compartments 10 to fourth compartments 12, there are second rake blades 18 and third rake blades 1, which are water permeable plate members (or water impermeable plate members).
A plurality of raking blades 9 and 20 are arranged radially so as to be in contact with each of the intermediate annular partition plates or the second annular partition plate 4 and to have a gap between them and the inner surface of the elastic ring 17, A water-permeable second chute 21, a third chute 22, and a fourth water-permeable chute for receiving sand falling from each of the raking blades 18 to 20 and supplying it to an adjacent compartment or discharging it to the outside of the drum 1. A chute 23 is provided.

Furthermore, the lower vibration device 24 is used as an impact member for repeatedly applying impact to the bottom outer surface of each of the four elastic rings 17, and the lower vibration device 24 is used as an impact member for repeatedly applying impact to the top outer surface of the elastic ring 17. An upper vibration device 25 having the same structure is disposed.

Further, water outlets of a water sprinkling pipe 26 for cleaning are opened inside the first chute 16 to the third chute 22, and water from a water supply pipe 27 for cleaning is also opened at the bottoms of the second compartment 10 to the fourth compartment 12. The exit is open.

Here, for example, the elastic ring 1 of the fourth compartment 12
7 (see FIGS. 4 and 5), it consists of an oscillator 31 such as a vibrator, a frame 32, and a bearing 3.
3, shaft 33', roll 34, bolt 35, spring 3
6, a nut 37, a fixing member such as a spring 36, etc., and the vibration of the oscillator 31 is transmitted in the order of the frame 32→shaft 33'→roll 34→elastic ring 17. This roll 3
4 rotates following the rotation of the drum 1. In FIGS. 4 and 5, 38 is a suspension frame.

Thus, the sand in the raw water charged into the first compartment 9 of the drum 1 settles on the bottom of the drum 1, and is transferred to the first raking blade 14 by the spiral blade 13, and is transferred to the first raking blade 14 by the spiral blade 13. After being transferred to the ceiling by the blades 14, it falls into the first chute 16 and then into the second compartment 10. Hereinafter, this settled sand is transferred to the second raking blade 18, the second chute 21, the third raking blade 19, the third chute 22, and the fourth raking blade 2.
0, and is discharged to the outside of the drum 1 through the fourth chute 23. The first chute 16 to the third chute 2
2, and in the second compartment 10 to the fourth compartment 12, the sand is washed in a multi-stage manner with clean water from the washing water sprinkling pipe 26 and the washing water supply pipe 27, respectively. Compartment room 12
A part of the washing water in the interior overflows from the third intermediate annular partition plate 8 and flows into the third compartment 11, the second compartment 10, and the first compartment.
It flows into the compartments 9 in order, and is separated from the sand by the washing and discharged from the drain port 3 to the outside of the drum 1 together with floating impurities. In this case, in parallel with water washing, the sand at the bottom of each compartment is The settled sand is subjected to vibration dewatering and cleaning action by the lower vibration device 24.

Here, for example, to explain in more detail the sand washing action in the fourth compartment 12, sand falls into the fourth compartment 12 together with the washing water, but mud and floating impurities are small in specific gravity, so they are immediately washed away. 3 Intermediate annular partition plate 8
At the same time, the cleaning sand overflows into the third compartment 11 and settles towards the bottom of the fourth compartment 12 due to its relative gravity. In this case, the sediment is washed while being washed by the washing water from the washing water supply pipe 27, but this washing water overflows into the third compartment 11 in the same manner as described above, and the precipitated sand is given to the elastic ring 17. The repeated impact removes impurities adhering to the precipitated sand, and the precipitated sand is dehydrated into a compacted state and transferred toward the ceiling by the fourth raking blade 20.

The settled sand transferred to the ceiling is transferred to the fourth raking blade 2.
Normally, it will not fall even if it reaches the ceiling because it is firmly held between 0. After falling smoothly into the fourth chute 23, it is discharged outside the drum 1.

The settled sand on the fourth raking blade 20 (in the conventional device, it entrained a large amount of water) is dehydrated and compacted, so the blade 1
It has the advantage of significantly increasing the amount of scraping per sheet, that is, the transfer capacity, and is therefore effective for mass processing.

Thus, in this embodiment, the sand is supplied to the washing water supply pipe 2 by the washing water sprinkling pipe 26 three times.
7 and 4 times by the lower vibration device 24 to remove impurities. Moreover,
In each of the compartments 10 to 12, water that has been dehydrated in the previous compartment by the lower vibration device 24 is washed, so extremely effective water washing is performed.

In the present invention, as shown in FIG. 3, a cross section is provided to prevent the settled sand being raked up by the raking blades from falling into each compartment due to the properties of the sand, the operating conditions of the classifier, etc. Preferably, a guard plate 28 having an arc shape and a width approximately equal to that of the raking blade is provided with its lower end immersed under the water surface of the drum 1 to function as a partition plate. The sand that is being raked up has the effect of preventing it from re-adhering.

Additionally, an inclined plate sedimentation device may be installed below the water surface near the drain 3, a water-permeable belt conveyor may be used instead of the chute, and a stirring member such as a rotating stirring rod may be installed within the chute. A hammering device may be provided in place of the upper vibrating device 25 or the lower vibrating device 24, or a pressing member may be provided in place of the upper vibrating device 25 to press and deform the elastic ring 17.

Furthermore, as another embodiment, the cleaning water supply mechanism may be configured such that only the cleaning water sprinkling pipe 26 or the cleaning water supply pipe 26 is used.
7 only, or connect the sprinkler pipe 26 to the first chute 16.
And the supply pipe 27 is connected to the fourth chute 21 only.
It may be arranged only in the compartment 12.

In addition, in order to quickly discharge the cleaning wastewater of settled sand generated in each compartment,
An overflow discharge chamber for cleaning wastewater may be provided between each compartment. As a specific example of the structure, a compartment may be formed by two annular partition plates and a drum wall, and a drainage hole may be opened in the drum wall.

As described above, according to the present invention, settled sand can be washed very effectively in a multi-stage manner, and sand with good cleaning quality can be obtained.In addition, since the sand is repeatedly subjected to impact, the sand can be scraped by the scraper blades. Benefits include increased efficiency, greatly improved sand transport ability, improved cleaning effect, good dehydration, and the ability to transport the sand directly to the site of use.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view, Fig. 2 is a right side view, Fig. 3 is a sectional view taken along the line of Fig. 1, and Figs. FIG. 3 is a front view and a side view of the device. 1... Drum, 2... First annular partition plate, 3... Drain port, 4... Second annular partition plate, 5... Sand sampling port, 6... First intermediate annular partition plate, 7... Second intermediate annular partition plate, 8
...Third intermediate annular partition plate, 9...First compartment, 10...
Second compartment, 11... Third compartment, 12... Fourth compartment, 13... Spiral blade, 14... First raking blade, 1
5... Raw water input chute, 16... First chute, 1
7... Elastic ring, 18... Second raking blade, 19... Third raking blade, 20... Fourth raking blade, 21... Second chute, 22... Third chute, 23... Fourth chute, 24... Lower part Vibration device, 25... Upper vibration device,
26...Cleaning water sprinkling pipe, 27...Cleaning water supply pipe,
28...Guard plate.

Claims (1)

[Scope of Claims] 1 One of the openings on both sides of a rotating drum into which mixed water containing sand is introduced and the sand is precipitated at the bottom is a drain port, and the other is a sand sampling port, and the precipitated sand in the rotating drum is The sand is transferred to the sand sampling port side, and is raked up from the water by a plurality of raking blades provided radially on the inner surface of the rotating drum, and transferred to the ceiling so that it can fall. In a rotary classifier adapted to be carried out, an intermediate annular partition plate is provided in the drum concentrically with the drum to form at least two compartments, and each of these compartments has the scraper blade and the scraper. A conveying member is provided to transport the settled sand falling from the blades to the adjacent compartment or to the outside of the drum, and an elastic material is provided over the entire circumference of the drum body at the location where the raking blades are provided in each compartment. or formed from a flexible material,
A mechanism for dewatering sedimented sand by repeated impact is provided on the outer surface of the bottom of each drum body, and a repetitive impact member or a pressing member is provided on the outer surface of the top of each drum body as a mechanism for promoting the fall of dehydrated sand, and the sand sampling port A cleaning water supply mechanism capable of supplying sand cleaning water to the nearest compartment is provided, and an opening in the intermediate annular partition plate is arranged so that the water in the nearest compartment sequentially flows toward the drainage port. A rotary classifier characterized by forming a section. 2. The rotary classifier according to claim 1, wherein the washing water supply mechanism is disposed on the conveying member of each compartment and/or at the bottom of each compartment. 3. The rotary classifier according to claim 1 or 2, wherein the scraping blade is a water-permeable plate-like member. 4. The rotary classifier according to claim 1, 2, or 3, wherein the conveying member is a water-permeable chute.