JPS5819338B2 - drum classifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drum classifier that classifies soil and sand while removing mud and impurities with water.

Conventional drum classifiers supply earth and sand into the drum along with a stream of water, send the earth and sand to the discharge end using a feeding spiral installed on the inner wall of the drum, and remove water while scraping up the earth and sand with a scraper plate before discharging it. The structure was such that the soil was discharged from the end to the outside, and the water (turbid water) used for washing the soil was to overflow from the supply end of the drum, but the direction in which the mud was transported by the feeding spiral was different from the direction of the flow of the muddy water. Because of the opposite situation and the fact that the sediment in the turbid water is difficult to sink due to the sediment flow that falls in the middle of the drum, even the sediment of the required particle size is discharged to the outside along with the turbid water, or the inner wall of the drum near the supply end) This has the disadvantage that the recovery rate decreases due to adhesion to the turbid water, and the cleaning effect is low because the discharged earth and sand are directly scraped up from the turbid water.

An object of the present invention is to provide a drum classifier that can eliminate such conventional drawbacks and perform classification and cleaning with higher efficiency.

This invention provides an outer drum 1 having a feeding spiral 2 on its inner circumferential wall.
An inner drum 3 having an overflow port 4 at the rear and a sediment discharge port 5 at the front is installed concentrically with the outer drum 1 in the middle of the interior. Exit 5
A dirt washing chamber 6 is formed in the front, a supply gutter 7 for supplying dirt and water from the outside is introduced inside the inner drum 3, and a washing nozzle 8 for washing the dirt is installed in the washing chamber 6.
A separating plate 10 is provided on the inner circumferential wall of the outer drum 1 midway, and a separating plate 10 is provided which is higher than the height of the overflow port 9 at the rear end of the outer drum 1. Scraping blades 11 are provided between the outer drum 1 and the inner drum 3 to transfer the transported earth and sand beyond the separation plate 10 to the front of the outer drum 1, and at the front end of the outer drum 1. This relates to a drum classifier equipped with a discharge device 12 for discharging to the outside the earth and sand that has fallen from the washing chamber 6 and the earth and sand that have been conveyed by the feeding spiral 2.

1 In the figure, 13 is a conical guide provided inside the inner drum 3, 14 is a scraping plate with a porous or mesh structure, and 15 is a raking plate for moving the inner drum 3 inside the outer drum 1 so as not to obstruct the flow of earth, sand, and water. 16 is a support plate for supporting the cleaning chamber 6 inside the outer drum 1;
Reference numeral 8 indicates a guide body and a scraping plate that constitute the discharge device 12, 19 indicates a discharge chute for discharging washed earth and sand, 20 indicates a gutter for discharging turbid water, 21 indicates a drum ring, and 22 indicates a roller for receiving the drum ring 21. , 23 are roller bearings, and 24 is provided around the outer drum 1.

A drive gear ring 25 is a belt conveyor, and 26 is a spiral provided on the inner wall of the cleaning chamber 6.

To explain the present invention based on the embodiment shown in the drawings, if earth and sand are dropped into the inner drum 3 of the rotating outer drum 1 from the supply gutter 7 along with a water stream, most of the earth and sand will be removed by the raking blades 1.
4 and is discharged into the cleaning chamber 6 from the discharge port 5 along the slope of the guide body 13.

On the other hand, from the overflow port 4 of the inner drum 3, turbid water containing low-grained earth and sand overflows to the rear (supply side) of the outer drum 1, but as it flows to the overflow port 9 of the outer drum 1, the necessary Grain-sized earth and sand settles and is sent forward (to the discharge side) by the feeding spiral 2, while mud and impurities are discharged from the overflow port 9 to the external gutter 20 without settling.

The earth and sand discharged into the washing chamber 6 is washed by fresh water sprayed from the washing nozzle 8 and falls onto the outer drum 1.

This part and the part on the supply end side of the outer drum 1 are separated by a separating plate 10.
Since the turbid water is separated by the supply end side, the water does not flow into the supply end side, but the water that flows from the washing chamber 6 crosses the separation plate 10 and flows into the supply end side.

Further, the sand fed by the feeding spiral 2 is transferred by the raking blades 11 over the separating plate 10 to the discharge end side.

Therefore, this earth and sand and the earth and sand that has fallen from the cleaning chamber 6 join together and are sent to the discharge end by the feeding spiral 2, and the raking blade 1
8. It will be discharged to the outside by the guide body 17.

According to the present invention, the sediment flow supplied by the supply gutter 7 falls into the inner drum 3, and the turbid water overflowing from the overflow port 4 flows down into the outer drum 1. Compared to the case where the earth and sand are allowed to fall, less earth and sand is thrown up by the outer drum, so the recovery rate of earth and sand is high.
The system separates turbid water from clear water, and finally scrapes up and discharges the earth and sand in the clear water, resulting in a high cleaning effect.

[Brief explanation of drawings]

- Fig. 1 is a longitudinal sectional side view showing an embodiment of the present invention, and Fig. 2 is a partially cutaway front view showing the structure of the inner drum portion. 1: Outer drum, 2: Feeding spiral, 3: Inner drum, 4: Overflow port, 5: Discharge port, 6: Washing chamber, 7: Supply gutter, 8: Washing nozzle, 9: Overflow port, 10: Separation plate , 11: raking blade,
12: Discharge device.

Claims (1)

[Claims] 1. An inner drum 3, which has an overflow port 4 at the rear and a sand discharge port 5 at the front, is installed concentrically with the outer drum 1 in the middle of the outer drum 1, which has a feeding spiral 2 on the inner peripheral wall. 1 and in front of the discharge port 5 of the inner drum 3, a supply gutter 7 for supplying earth and sand from the outside together with water is introduced into the inner drum 3. A cleaning nozzle 8 for cleaning earth and sand is introduced into the chamber 6,
Water overflow port 9 at the rear end of the outer drum 1 is located on the inner peripheral wall of the outer drum 1.
A separation plate 10 higher than the height of the outer drum 1 is provided, and in order to transfer the earth and sand conveyed along the inner circumferential wall of the outer drum 1 by the feeding spiral 2 to the inside front of the outer drum 1 beyond the separation plate 10. Scraping blades 11 are provided between the outer drum 1 and the inner drum 3, and at the front end of the outer drum 1, the earth and sand that has fallen from the cleaning chamber 6 and the earth and sand that has been conveyed by the feeding spiral 2 are removed to the outside. A drum classifier equipped with a discharge device 12 for discharge.