JP5638487B2 - Dehydrator - Google Patents

Description

  The present invention is, for example, a surplus cement sludge called a “returning container” that is contained in a concrete mixer truck returned from the site in a ready-mix factory, or discharged together with cleaning water when the concrete mixer truck is cleaned. The present invention relates to an apparatus for dewatering cement sludge in order to facilitate disposal of mud cement sludge or surplus cement sludge (also referred to as concrete slurry) generated in a concrete secondary product factory.

  Cement sludge generated in large quantities in ready-mixed concrete factories, etc. is generally a granular material with no caking capacity by separating and collecting gravel and sand, and then stirring them overnight in a stirring tank called thickener. Was treated as waste. However, if such waste is left undisturbed, it will be dispersed by rainwater, etc., or it will become sludge and may cause pollution, so strict management is required (referred to as managed waste), There is a problem that the processing cost becomes very high.

  On the other hand, the dehydrating apparatus shown in the following Patent Document 1 according to the invention of the present inventor has a plurality of cylindrical members (hereinafter referred to as pipes) horizontally mounted on at least one side of a water tank in which cement sludge is stored. In addition to dewatering by draining the moisture in the cement sludge through a small gap between each pipe, it was possible to easily prevent the gap from becoming clogged by appropriately rotating the pipe. Is.

Japanese Patent No. 4277057

By the way, in the above dewatering apparatus, it takes time to allow the water in the cement sludge to flow out from a slight gap between the pipes. Therefore, in order to obtain a certain dewatering capacity, it is larger than a longer pipe. There was a problem that a water tank had to be formed, which required installation space and increased equipment costs.
Therefore, the present invention is intended to improve the dewatering capacity of this dewatering device without increasing such installation space and equipment cost.

Therefore, in the invention according to claim 1, a plurality of pipes are stacked horizontally on at least one side of a water tank in which cement sludge is stored, and water in the cement sludge is slightly transferred between the pipes. in the dehydration device draining gate to flow out from the gap is formed, toward the outer diameter in the circumferential direction on the outer peripheral surface of the pipe to form a partially protruding portion of the wedge shape to be gradually changed, by rotating the pipe The projecting portion hits the outer peripheral surface of the upper or lower pipe so that the gap between the pipes is enlarged.

  The gap between the pipes is expanded as necessary, and moisture is quickly discharged from the gap, thereby improving the dewatering efficiency.

The longitudinal cross-sectional view of the whole dehydration apparatus which concerns on this invention. The side view of the principal part of the spin-drying | dehydration apparatus which concerns on this invention. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. Sectional drawing which showed the operation state of the principal part of FIG.

Next, an embodiment of a dehydrating apparatus according to the present invention will be described with reference to the drawings. The water tank 1 is formed in a plane rectangular shape from a horizontal bottom plate 1a, a frame 1b, and a side plate 1c, and is formed with an upper surface open so that cement sludge can be introduced from a concrete mixer truck or the like. 3 is drainage gates provided on both side surfaces of the water tank 1 in the longitudinal direction. The drainage gate 3 is fixed with pillars 4a and 4b made of H-shaped steel at appropriate intervals, and both ends are disposed between the pillars 4a and 4b. By loosely fitting, a plurality of straight pipes 5a to 5i are stacked horizontally. For the pipes 5a to 5i, for example, a well-known straight steel pipe manufactured for gas piping or for a water supply pipe can be appropriately cut.
In this way, by forming a draining gate 3 by stacking a plurality of pipes 5a to 5i horizontally, the pipes 5a to 5i are in line contact with each other, and moisture in the cement sludge is formed from the slight gaps. , While the solids in the cement sludge are dammed without passing through the gaps.

  6 is a pressure adjusting means provided on the uppermost pipe 5i, and supports the bar 7 vertically by loosely fitting the upper part into a through hole formed in a part of the frame 1b. A coil spring 8 that biases downward is provided, and a horizontal member 9 that is horizontally mounted on the pipe 5i is provided at the lower end portion of the bar 7, and the pipe 5i is pressed downward with appropriate pressure through the horizontal member 9. doing. As a result, the pipes 5a to 5i are pressure-bonded, and the gaps between the pipes 5a to 5i are maintained and formed in an appropriate size with respect to the water pressure.

  Reference numerals 10a to 10h are pneumatic cylinders provided in the frame 1b. The levers 11 extending in the radial direction are fixed to the outer surfaces of the pipes 5a to 5h, and the spindles of the pneumatic cylinders 10a to 10h are connected to the levers. It is pivotally attached to the tip of this through a pin 12. For this reason, by operating the pneumatic cylinders 10a to 10h, the pipes 5a to 5h can be individually rotated via the pin 12 and the lever 11. Further, as shown in FIG. 2, wedge-shaped partial projections 13 and 14 are fixed to the outer peripheral surfaces near both ends of each of the pipes 5a to 5h by fixing means such as welding. For this reason, when the pipes 5a to 5h are rotated, as shown in FIG. 4, the partial projections 13 and 14 respectively contact the outer peripheral surfaces of the upper pipes 5b to 5i, and the gaps between the pipes 5a to 5i. Is expanded against the elasticity of the coil spring 8. In addition, 15 is a bowl-shaped part formed to project the bottom plate 1a outward at the lower part of the drain gate 3 and guide the drainage discharged from each drain gate 3 to the outside. The ultrasonic sensor provided in order to detect the water level of is shown.

  On the other hand, 20 is a sludge hoisting device provided for scooping up the solid content in the cement sludge that has settled and deposited on the bottom of the water tank 1, and the sludge hoisting device is provided on the bottom surface 1 a at one end in the longitudinal direction of the water tank 1. An inclined surface 21 that extends obliquely upward is formed, and a discharge port 23 is provided above the inclined surface 21. A conveyor drive sprocket 24 is provided above the discharge port 23, and guide wheels 25 and 26 are rotatably supported near both ends of the inner bottom of the water tank 1, and rakes 27 are attached at appropriate intervals. The endless chain conveyor 28 is wound around the sprocket 24 and the guide wheels 25 and 26, and the driving sprocket 24 is driven by a motor so that the chain conveyor 28 slowly rotates in the direction indicated by the arrow. Is configured to do. For this reason, the solid content in the cement sludge accumulated on the bottom plate 1a is scooped up to the inclined surface 21 by the rake 27, further transported to the discharge port 23, dropped, and discharged to the outside. Reference numeral 29 denotes rail members provided on both upper sides of the water tank 1 in order to support the chain conveyor 28 returning to the water tank 1.

  In the dehydrating apparatus configured as described above, the remaining raw concrete remaining in the drum of the mixer truck or the cement sludge discharged together with the cleaning water when the mixer truck is washed is put into the water tank 1, and the solid in the cement sludge The components are allowed to settle on the bottom plate 1a, and water in the cement sludge is gradually discharged from the gaps between the pipes 5a to 5i. At the same time, the pneumatic cylinders 10a to 10h are driven according to the water level detected by the sensor 16. Is operated and the pipes 5a to 5i at a height where the supernatant water is located in the water tank 1 are rotated, so that the supernatant water can be quickly discharged from the enlarged gap. By allowing the supernatant water to quickly flow out from the gap thus expanded, separation from the solid content in the cement sludge is promoted, and the time required for dehydration can be greatly shortened.

  For example, 10 minutes after the cement sludge is put into the water tank 1 from the concrete mixer truck (measured by an external timer), the water level of the water tank 1 is detected by the sensor 16, and as shown in FIG. When H is the height of the pipe 5f, the pneumatic cylinder 10e is operated to rotate the lower pipe 5e of the pipe 5f as shown in FIG. As a result, the gap between the pipe 5f and the pipe 5e is enlarged. Thereby, only the supernatant water can be quickly discharged from the gap. After that, after an appropriate time, the sensor 16 detects the water level of the water tank 1, rotates the pipe 5d, enlarges the gap between the pipe 5e and the pipe 5d, and causes the supernatant water to flow out from the gap. Thus, by rotating the lower pipe one step at a time with an appropriate time interval, the outflow of the supernatant water is accelerated, and even a large amount of cement sludge can be dehydrated in a short time. For this reason, according to the present invention, the dewatering capacity of the dewatering apparatus can be greatly improved without increasing the installation space and equipment cost. During normal operation, the lowermost pipe 5a and pipe 5b may not be rotated because there is a risk that solid content may flow out.

  As shown in the figure, since the partial protrusions 13 and 14 have a wedge shape, the gap can be gradually enlarged according to the angle at which the pipes 5a to 5h are rotated. It becomes easy to control. In the device shown in this embodiment, the partial protrusion of the rotated pipe hits the outer peripheral surface of the upper pipe so as to expand the gap, but the partial protrusion hits the outer peripheral surface of the lower pipe. Needless to say, the gap between the pipe and the lower pipe can be increased by rotating the pipe.

Since the pipes 5a to 5i are pressed against each other by the pressure adjusting means 6, the gap is reduced by returning the pipes 5a to 5h to the state before rotation. As shown in this embodiment, the pressing force adjusting means 6 is configured so that the pressing force is adjusted by utilizing the elasticity of the coil spring, and an appropriately sized weight is provided to adjust the pressing force by gravity. You may comprise. Alternatively, it is possible to crimp each pipe only by its own weight without providing such a pressure adjusting means 6. In addition, the pipes 5a to 5h may be solid ones (round bars) even if they are not hollow as shown in this embodiment. The pressing force may be adjusted.
In addition, by rotating the pipes 5a to 5h, the solid matter sandwiched in the gaps of the pipes 5a to 5h can be easily separated from the gaps with the rotation thereof. It is also possible to rotate the pipes 5a to 5h.

  The dehydrating apparatus according to the present invention includes cement produced when cleaning equipment such as a mixer, a hopper, and a molding die in a concrete secondary product factory such as a fume pipe, a utility pole pile, and a concrete block in addition to a ready-mix factory. It can be used to treat wastewater or to treat excess cement sludge.

DESCRIPTION OF SYMBOLS 1 Water tank 3 Drain gate 5a-5i Pipe 6 Pressure adjusting means 10a-10h Pneumatic cylinders 13, 14 Partial protrusion 20 Sludge raising device

Claims (1)

A dewatering gate in which a plurality of pipes are stacked horizontally on at least one side of a water tank in which cement sludge is stored, and a drain gate is formed to allow moisture in the cement sludge to flow out from a slight gap between the pipes. in the apparatus, the outer peripheral projecting portions of the upper or lower pipe by the outer diameter toward the circumferential direction to form a partial protrusion of the wedge shape to be gradually changed, thereby rotating the pipe on the outer circumferential surface of the pipe A dehydrating apparatus characterized in that a gap between the pipes is expanded by hitting a surface.

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