JP2000317401A - Rotary classifier of ready-mixed concrete waste water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fine aggregate from flowing out when washing water overflows from the water tank and furthermore, to present a discharge port for the washing water from being clogged in a wire net rotary classifier for performing aggregate recovering treatment of cement base waste water. SOLUTION: A wire net rotary classifier 1 is immersed in water in a fixed water tank 10 and fine aggregate is scooped up and discharged by a rotary scraping bucket 4 that a screw is provided around a classifier and fitted in a U-shaped groove 3. A region 9 of overflow is made in the central part of the fixed water tank, and a discharge port 8 is installed at the height of the same horizontal surface as the bottom surface of the fixed water tank on the coarse aggregate discharge side face of the U-shaped groove, and drainage of the fixed water tank is performed on daily work finish.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recovering aggregate from remaining concrete brought back from a concrete mixer truck and wastewater from which the mixer truck has been washed.

[0002]

2. Description of the Related Art A conventional overflow port portion 12 of a fixed water tank in a drum type classifier is provided on the same side as an inlet 11 for the machine. In the vicinity, turbulence flows immediately after the introduction, so fine sand flows out frequently. Also, a drain port (not shown)
Is provided on the bottom surface of the fixed water tank. In this structure, fine aggregate enters and closes immediately, making it impractical. Therefore, the fixed water tank is always operated with sludge water.
Therefore, since the wire mesh of the drum is always partially immersed in the sludge, shower water from above only hits the exposed portion. In addition, intermittent operation is performed at night and on holidays when work is stopped to prevent sludge in the fixed water tank from settling and solidifying. Since the raw water inlet 11 and the overflow port 12 are close to each other, a large amount of fine sand flows out, and a fine sand separator (not shown) called a cyclone is provided for recovery.

[0003]

In the structure of the conventional classifier, there is a problem that fine sand flows out more than the overflow port, and the current drain port is easily clogged. It is normal that intermittent operation is performed. This is also pollution caused by noise. In addition, since a cyclone is additionally provided to collect the fine sand flowing out, there are various drawbacks such as an increase in equipment costs and maintenance costs, and a need for an installation area. In view of these points, the present invention has a fixed water tank that is drained at the end of each day, so that the drum is exposed and can be washed all around, so that it is easy to manage without clogging of the wire mesh and eliminate intermittent operation at night, The purpose is to reduce costs.

[0004]

A rotatable drum-type classifier is coaxially immersed in a semicircular fixed water tank, and a plurality of feeders for feeding coarse aggregate are provided in the drum. Feather 1
And a bucket 4 for winding fine aggregate feed screw 5 wound around the outer periphery of the cylindrical portion of the drum and raked and discharged at the end of the screw. The outlet is provided near the U-shaped groove, and is located at a position near the sludge inlet where turbulence is avoided. The drain port of the fixed tank is U-shaped to prevent inflow of sludge on the bottom.
It is located on the side surface 8 of the U-shaped groove 3 in the coarse aggregate discharging direction, and is provided at the bottom horizontal position of the fixed water tank.

[0005]

Operation and Embodiment The operation of the present invention will be described based on an embodiment. FIG. 1 is a diagram showing the internal structure of the trommel of the present invention, and FIG.
FIG. 3 is a front view of the trommel, FIG. 3 is a partial view of the vicinity of the discharge port in AA ′ section, and FIG. 4 is an enlarged view of the discharge port and the U-shaped groove bucket. Horizontal circular trommel 1 is concentric semicircular fixed water tank 10
In a drum type classifier in which a bucket 4 is fitted in a U-shaped groove 3 provided in a fixed water tank on the end side of the screw 5, the drain port 8 of the fixed water tank is connected to the U-shaped groove 3. On the gravel discharge side of the side plate, and at the same level as the bottom of the fixed water tank. Sludge is introduced from the raw water inlet 11 and the trommel 1 rotates, while shower water 6 is discharged from above, coarse aggregate is sent to the feed blade 13 and fine aggregate is sent to the outlet, and fine aggregate is sent to the back by the screw 5. It falls into a U-shaped groove while being sent. The washed coarse aggregate is supplied to the outlet 14
As a result, the fine aggregate is picked up by a water wheel type pumping bucket 4 provided on the outer periphery of the drum 2, dropped into a chute 7 and discharged. Wash water is discharged from the overflow port 9. Since this outlet is provided at a position distant from the stock solution inlet 11, the outflow of fine particles can be prevented. When the work is completed, drain the fixed water tank. The drain port 8 is located horizontally with respect to the bottom surface of the fixed water tank and is provided in the U-shaped groove, so that the outflow of fine sand can be prevented.

[0006]

[Effect] As is clear from the above detailed description, the biggest problem of trommel in the ready-mixed concrete factory was to prevent and remove the clogging of the wire mesh. The wire mesh of the trommel body was completely exposed and rotated while being showered, so that the clogging was almost completely eliminated. The overflow port is located at a position away from the stock solution inlet, and the drain port is provided on the side plate of the U-shaped groove at the same position as the bottom of the fixed water tank, preventing fine sand from flowing out and eliminating clogging As a result, the need for a cyclone was eliminated, and equipment and maintenance costs were reduced. Eliminating the need for nighttime intermittent operation has the effect of greatly contributing to the prevention of pollution due to noise.

[Brief description of the drawings]

FIG. 1 is a front internal structure diagram of a trommel.

FIG. 2 is a trommel side view.

FIG. 3 is a partial view of the vicinity of a discharge port taken along the line AA ′.

FIG. 4 is an enlarged view of a discharge port and a U-shaped groove bucket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trommel 2 Drum 3 U-shaped groove 4 Rotary scooping bucket 5 Screw plate 6 Shower water 7 Chute 8 Discharge port 9 Overflow port 10 Fixed water tank 11 Raw water input port 12 Conventional overflow port section 13 Sending blade 14 Discharge port

Claims (1)

[Claims] 1. A wire mesh drum 2 rotatably provided,
It is provided in a semicircular fixed water tank 10 so as to be immersed on a concentric shaft, receives the wastewater after coarse aggregate separation in the fixed water tank, and sets the fine aggregate feeding screw 5 along the outer peripheral wall of the drum. In a drum type classifier, which is wound and has a rotary scraping bucket 4 provided at the tip thereof and which is fitted into a U-shaped groove 3 provided in a fixed water tank, an overflow port 9 is provided at the center of the fixed water tank. And a discharge port 8 is provided on the coarse aggregate discharge side surface of the U-shaped groove at the same level as the bottom surface of the fixed water tank.