JPS6015446B2 - How to clean the inside of the rotating drum of a concrete mixer vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cleaning the inside of a rotating drum of a concrete mixer truck.

In general, in a concrete mixer truck, after the work is completed, it is necessary to wash the rotating drum with water to remove the ready-mixed concrete adhering to the inside.

The above-mentioned washing with water is usually carried out by introducing washing water into the rotating drum main body 1 from a hopper 3 provided in the closed part 2 of the rotating drum main body 1 through a charging cylinder 4, as shown in FIG. This is a cleaning method in which the washing water is discharged from the entrance part 2 by performing the footing operation for one minute and then reversing the flow. In this method, the cleaning water rotates together with the blades 6 in the rotating drum main body 1, so there is little relative movement between the cleaning water and the blades, and the cleaning effect on adherent concrete is small, especially when the rotating drum There was almost no circulating flow of cleaning water in the discharge passage 5 between the inner surface of the closed portion of the main body 1 and the outer surface of the charging cylinder 4, and therefore the discharge passage 5 could not be sufficiently washed with water. . Therefore, each time the rotating drum is used, the adhering fresh concrete hardens and gradually increases in amount, resulting in the inconvenience of narrowing the discharge passage 5. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cleaning method that can sufficiently wash the discharge passage of a rotating drum with water.

Hereinafter, a method for cleaning a rotating drum according to the present invention will be explained with reference to the drawings. In FIGS. 2 and 3, reference numeral 7 denotes a rotating drum body, and a blade 9 is spirally provided on its inner surface from the bottom (not shown) of the rotating drum body 7 to an opening 8. A charging cylinder 10 supported by a blade 9 and a hopper 13 are provided.

These structures are similar to conventional ones. The charging cylinder 10' has a spiral gap 11 or a plurality of holes 12. Reference numeral 15 denotes a prismatic closing member made of sponge or other flexible material that is stuffed into the discharge port at the end of the blade so as to close the discharge passage.

In the above case, when the cleaning water is introduced into the rotating drum main body 7 from the hopper 13 and the rotating drum 7 is rotated in the reverse direction (discharging rotation), the cleaning water in the rotating drum is pushed up by the blades 9 and rises in the direction of arrow A. However, since the discharge port of the rotating drum main body 7 is blocked by the closing member 15, the rising cleaning water is
The discharge passage 14 between the open □ end inner surface of the rotating drum body 7 and the outer surface of the charging cylinder 10 is filled, and further, the discharge passage 14 between the inner surface of the open end side of the rotating drum body 7 and the outer surface of the charging cylinder 10 is filled, and further, the discharge passage 14 of the charging cylinder 10 is filled through the helical gap I1 or the hole 12 of the charging cylinder 10. It flows into the interior and falls towards the back (bottom side) of the rotating drum.

Then, it is pushed up again by the blade 9 toward the discharge port of the rotating drum 7. In this way, the cleaning water circulates in the rotating drum 7. By repeating this operation, around the charging cylinder 10, the discharge passage 14
Ready-mixed concrete adhering to the blade 16 and the inner surface of the rotating drum 7 can be cleaned.

After the cleaning work is completed, the closing member 15 is removed and the mixed water of cleaning water and fresh concrete is discharged to the outside of the rotating drum.

As explained above, in the method for cleaning a rotating drum according to the present invention, the discharge port of the rotating drum is closed with a blocking member such as a sponge, and the rotating drum is rotated in the opposite direction to circulate and flow the cleaning water within the rotating drum. , as in the secondary cleaning method, the cleaning water is circulated along with the blades from the bottom of the charging cylinder to the back of the rotating drum, and most of the cleaning water is not in the discharge passage around the charging cylinder. Compared to a method in which no fluid flows, the cleaning effect is greater, and the discharge passage around the charging cylinder can be sufficiently cleaned.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part of a rotating drum showing a conventional cleaning method, Fig. 2 is a sectional view of the rotating drum showing a washing method according to the present invention, and Fig. 3 is a front view of the opening □ section. be. 7... Rotating drum, 8... Sekiguchi section, 1
0...Charging cylinder, 11...Gap, 12
... Hole, 15 ... Closing member. *'Zuen 2, Purple 3

Claims (1)

[Claims] 1. In the rotating drum of a concrete mixer truck, where the charging cylinder attached to the opening of the rotating drum body has a spiral gap or multiple holes, the discharge port at the end of the blade is blocked, and cleaning water is poured into the rotating drum. A method for cleaning the inside of a rotating drum of a concrete mixer truck, which comprises rotating the rotating drum in the opposite direction (discharging rotation) after inputting water to circulate and flow the cleaning water through the spiral gap or the plurality of holes.