JP2753486B2 - Quantitative supply device for returned ready-mixed concrete discharged from mixer trucks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for quantitatively supplying returnable concrete remaining in a concrete mixer truck and discharged together with washing water to a coarse aggregate recovery apparatus.

[0002]

2. Description of the Related Art Returned concrete discharged together with washing water when washing the inside of a drum of a concrete mixer truck is conventionally guided to a coarse aggregate collecting device such as a trommel classifier, a vibrating sieve, or an inclined cage. Then, the collecting device separates and collects coarse aggregates such as gravel, and then is led to a fine aggregate collecting device such as a classifier to separate and collect fine aggregates such as sand, and then puts them into a stirring tank. The guide supernatant water is collected, and the sludge water settled in the stirring tank is fed to a filter press by a high-pressure pump for dehydration treatment.

[0003] By the way, the returned ready-mixed concrete discharged from the concrete mixer truck for the above treatment is naturally guided to the coarse aggregate recovery device only by the fall energy due to the inclination of the water collecting gutter without using a pump. In this way, the equipment cost is reduced, and troubles such as gravel biting caused by using a pump are prevented. (See Japanese Patent Publication No. 60-21841).

[0004]

However, in the above device,
If a large amount of ready-mixed concrete is discharged from the mixer truck at one time, it flows into the coarse aggregate recovery device at one time, so that there is a problem that the processing capacity is exceeded and a trouble occurs.

[0005] Therefore, there is a problem that a coarse aggregate recovery apparatus having a large processing capacity is required, and the equipment cost is rather increased.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a linear drainage gutter having a substantially U-shaped cross section and having a top open to a car wash area is supported with a gentle slope. At the upper end of the drainage gutter, an outlet is provided for ejecting pushing water toward the inside of the drainage gutter. At the lower end of the drainage gutter, the outlet is provided with a vibrating sieve, a trommel classifier, etc. Facing the coarse aggregate recovery device, a bearing is provided in the drainage gutter, and a screw extending to the outlet is pivotally supported in the drainage gutter. It is characterized in that the screw is gradually supplied to the coarse aggregate recovery device in accordance with the rotation of the screw.

[0007]

[Function] Even if a large amount of ready-mixed concrete is discharged from the mixer truck to the drainage gutter at a time, the ready-mixed concrete is gradually turned on by pushing water and rotating the screw according to the processing capacity of the coarse aggregate recovery device. It can be supplied to the coarse aggregate recovery device.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a main part of the quantitative supply device in a longitudinal section, and FIG.
FIG. 3 is a plan view, and FIG. 3 is a sectional view taken along line XX. FIG. 4 schematically shows a flow sheet of the entire processing apparatus. This processing device is exemplified as having a medium processing capacity. In the figure, reference numerals 1a, 1b, and 1c denote car washing places having a space where three mixer trucks 2 can be stopped.

A straight drainage gutter 3 is supported on the trailing edges of the car washing stations 1a, 1b, 1c by a support leg 4 at a gentle inclination having an inclination angle of about 2 to 10 degrees. As shown in FIG. 3, the drainage gutter 3 has a substantially U-shaped cross section with an open upper surface, and the returned ready-mixed concrete discharged from the mixer truck 2 is received by the drainage gutter 3.

Reference numeral 5 denotes an outlet provided at the inclined upper end of the drainage gutter 3, from which water can be jetted into the drainage gutter 3.

Numeral 6 denotes a vibrating sieve provided as a coarse aggregate collecting device provided near the car washing stations 1a, 1b, 1c. An outflow port 7 provided at the lower end of the drainage gutter 3 is connected to the vibrating sieve. 6 on the sieve net.

Further, a mounting piece 8 is provided in the middle of the drainage trough 3 so as to lie inside the drainage trough 3 and form a flow gap 8a below the drainage trough 3 as shown in FIG. Bearing 8 on piece 8
And one end of the rotating shaft 11 of the screw 10 is rotatably supported by the bearing 9. In addition, screw 1
Reference numeral 0 extends right above the outlet 7, and a sprocket 13 is provided at the other end of the rotating shaft 11 of the screw 10. The sprocket 13 is connected to the rotating shaft of the motor 12 with a speed reducer via an endless chain 14. ing.

For this reason, washing water is supplied to the drum of the mixer truck 2 stopped at the car washing stations 1a to 1c via water supply hoses 19a to 19c, and the returned concrete in the drum is removed by inclining the drum. The water is discharged from the drum at the same time as the washing water and is received by the drainage gutter 3. Pressing water is blown out from the outlet 5 and the screw 10 is rotated at a low speed in a predetermined direction by driving a motor 12 with a speed reducer. 3 and at the same time, the ready-mixed concrete is further caused to flow downward by the helical surface caused by the rotation of the screw 10 in accordance with the rotation of the screw 10. 6
Spill over. The pushing water jetted from the outlet 5 dilutes the ready-mixed concrete in the drainage gutter 3 to increase its fluidity, and also prevents the fresh concrete from adhering to the inner surface of the drainage gutter 3 and the screw 10.

The vibrating sieve 6 is provided directly above the sludge tank 15, and coarse aggregate such as gravel caught on the sieve mesh of the vibrating sieve 6 is discharged onto a belt conveyor 17 from a classification port 16. Is transported to the collection gravel yard 18. In addition, sludge water containing fine aggregate such as sand passes through a sieve net, settles in a sludge tank 15, and is further sucked up by a sand pump 20, and as shown in FIG.
Sent to

As shown in FIG. 4, the classifier 2
1 discharges the sand separated from the sludge water to a collection sand storage 22. The sludge water is stored in the stirring tank 24 through the pipe 23. The sludge water settled in the stirring tank 24 is sucked up by the pump 25 into the receiver tank 26, further sent to the filter press 28 by the high-pressure pump 27, and dewatered to form a filter cake 29 and stored in the cake storage 30. . The filtered water discharged from the filter press 28 is stored in a supernatant water tank 31 and a pump 32
As a result, the water is supplied to the water supply hoses 19a to 19c as washing water for the mixer truck 2 and is used as pushing water to be jetted from the outlet 5.

[0016]

As described above, the apparatus for quantitatively supplying the returned ready-mixed concrete according to the present invention always smoothly feeds the ready-mixed concrete discharged to the drainage receiving shaft to the coarse aggregate recovery apparatus by the synergistic action of pressing water and rotating the screw. In addition to feeding, the amount of rotation can be controlled by controlling the number of rotations of the screw, so that an amount consistent with the processing capacity of the coarse aggregate recovery device can be always supplied. For this reason, the ready-mixed concrete is not supplied at one time, and there is a beneficial effect such that the trouble of the coarse aggregate recovery device is eliminated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a quantitative supply device for returned ready-mixed concrete according to the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a sectional view taken along line XX of FIG. 1;

FIG. 4 is a schematic diagram of a flow sheet of the entire processing apparatus.

[Explanation of symbols]

 1a, 1b, 1c Car wash area 2 Mixer car 3 Drainage gutter 5 Blow outlet 6 Vibrating sieve 7 Outlet 9 Bearing 10 Screw 12 Motor with reduction gear

Claims (1)

(57) [Claims] 1. A drainage gutter having a substantially U-shaped cross section and having a top open to a car wash area is supported with a gentle slope, and an inclined upper end of the drainage gutter is directed toward the inside of the drainage gutter. In addition to providing an outlet for ejecting pressurized water, the outlet provided at the lower end of the slope of the drainage gutter faces a coarse aggregate recovery device such as a vibrating sieve or a trommel classifier. A bearing is provided and a screw extending to the outlet is axially supported in the drainage gutter, and the returned ready-mixed concrete discharged from the mixer truck is gradually supplied to the coarse aggregate recovery device according to the pushing water and the rotation of the screw. A fixed-quantity supply device for returned ready-mixed concrete discharged from a mixer truck, characterized in that: