JPS6218406Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an apparatus for treating washed sewage generated when cleaning ready-mixed concrete adhering to the chute, discharge blade, etc. of a concrete mixer truck.

Conventionally, in concrete mixer trucks, wastewater from the chute and other cleaning equipment was directly disposed of at the work site. However, recently, pollution problems have become a hot topic, and it has become impossible to dispose of cleaning wastewater on roads and work sites.
The method used is to catch this in a bucket and put it into the drum through the hopper. The disadvantage of this method is not only the inconvenience of carrying a fairly heavy bucket in one hand up and down narrow steps, but also the constant danger.

As a means to avoid such inconvenience and danger, a method is known in which the chute and the wastewater storage tank are connected with a special bellows-shaped pipe and the wastewater is stored in the wastewater storage tank (Japanese Patent Laid-Open Publication No. 51−
No. 78031). This method avoids the risk of carrying a bucket up and down the steps and introducing dirty water into the drum. However, not only is it inconvenient to prepare a special bellows-shaped pipe in advance, but also to have to attach and remove it during cleaning operations.
There remains the inconvenience that the sewage in the sewage storage tank still has to be disposed of manually.

In order to eliminate the above-mentioned inconvenience, this invention installs a wastewater storage tank directly under the chute, pumps air into the tank, and pumps the wastewater inside the tank to the outside through a hose. The purpose of the present invention is to provide a washing sewage treatment device for a concrete mixer truck, which reduces labor and contributes to the rationalization of sewage treatment work.

This idea will be explained in detail below with reference to the drawings.

The drawing shows one embodiment of this invention. In the drawing, 1 is the chassis of a concrete mixer truck. A drum 2 is provided on the chassis 1, and a discharge chute is provided at the rear open end of the drum 2. 3a is axis 4
It is rotatably provided through the. The discharge chute 3a is provided with an auxiliary chute 3b which can be extended downward via a hinge pin 3c.

The sewage storage tank 5 has a support member 6 attached to the rear of the chassis 1 so as to be located directly below the tip of the discharge chute 3a rotated in the width direction of the chassis 1.
Supported by. It is convenient if the sewage storage tank 5 is movably provided on the support member 6, since it can also receive the sewage from the auxiliary chute 3b. A flange 8 is formed around the socket 7 of the wastewater storage tank 5, and a lid 10 is provided at one end of the flange 8 via a hinge 9.
On the opposite side of the hinge 9, a U-shaped notch 11 of the same shape is formed in each of the flange 8 and the lid 10,
A T-shaped bolt 1 is provided in the notch 11 on the flange 8 side with a threaded portion 13a that is screwed into the wing nut 12.
3 is suspended so that it can rotate up and down. Note that this T-shaped bolt 13 may be suspended on the lid 10 side, but the point is that it is not limited to this as long as it can seal the lid 10.

The lid 10 is provided with an O-ring 14 at a point in contact with the flange 8, and an air intake port 15 is provided to communicate with the wastewater storage tank 5. This air intake port 15 may be provided on the side wall of the wastewater storage tank 5, but in this case,
It is preferable to provide it under the wire mesh 16 as shown by the dotted chain line.

The sewage storage tank 5 is provided with a removable wire mesh 16 inside thereof, and
A tapered portion 18 having an acute aperture angle θ is formed between the receiving port 7 and the discharge port 17. The constriction angle θ is an angle necessary to prevent clogging of mortar, etc. in waste water during air pressure feeding, and is preferably 20° or less.

Further, one end of a hose 19 having the same diameter as the discharge port 17 is connected to the discharge port 17 of the sewage storage tank 5, and the hose 19 is connected to the rear column 2.
It is disposed from the upper part of the hopper 21 to the hopper outlet 22 so as to be removable along the hopper 21. This hose 19
A material with low sliding resistance, such as plastic, is used. The diameter of the hose 19 is usually at least 10 times the size of the fine aggregate contained in the wastewater, preferably
Set to 30-50mm.

Furthermore, the air intake port 15 of the lid 10 is connected to the flexible tube 2.
3 to an air supply source 24. This air supply source 24 includes a brake air tank 25 on the chassis side, a supply valve 26, a pressure reducing valve 27, and an on-off valve 2.
8. This supply valve 26 is
Air supply to the secondary side is stopped until the pressure on the primary side necessary for pumping sewage reaches the minimum pressure, and air supply to the secondary side is started after the minimum pressure is exceeded. On the other hand, the pressure reducing valve 27 maintains a constant pressure necessary for pumping the wastewater, and the on-off valve 28 opens the circuit. Note that a new air supply compressor may be installed instead of using the brake air tank 25 on the chassis side.

Next, the operation of this invention will be explained. First, a certain amount of water is flushed through the discharge chute 3a and the auxiliary chute 3b to wash them, and the waste water is stored in the waste water storage tank 5 with the lid 10 opened in advance. The contained wastewater is separated from coarse aggregate by a wire mesh 16, and collected in the lower part of the wastewater storage tank 5. After storing the wastewater, the lid 10 is closed, the threaded part 13a of the T-shaped bolt 13 is rotated upward to stand upright, and then the wing nut 12 is screwed onto the threaded part 13a and tightened to seal.

After the lid 10 is sealed, the opening/closing valve 28 of the air supply source 24 is opened to send air at a constant pressure into the wastewater storage tank 5. Then, the sewage accumulated at the bottom of the sewage storage tank 5 is pushed up inside the hose by the pumped air, and is discharged from the hopper outlet 22 into the drum 2 through a charging cylinder (not shown). .

Note that the air intake port 15 is connected to the wastewater storage tank 5.
When provided on the side wall below the wire mesh 16, pressurized air can effectively pump wastewater without being depressurized by the wire mesh 16 or the separated coarse aggregate.

In addition, if cleaning water is poured into the wastewater storage tank 5,
It is possible to blow away and clean fresh concrete adhering to narrow areas such as the inside of the charging cylinder and drum, and also to remove the hose 19 from the hopper 21 and clean the same adhesion on the outside of the drum, etc. You can also do it.

The wastewater discharged into the drum is discharged after returning to the base and before the fresh concrete is put in, and the coarse aggregate separated by the wire mesh 16 is also dumped.

As described above, in this invention, the wastewater storage tank 5 is provided directly below the discharge chute 3a or the auxiliary chute 3b, and the wastewater inside the wastewater storage tank 5 is pumped to the outside via the hose 19 by the pumped air. It is something to do. Therefore, workers are not only freed from dangerous work because they do not have to carry buckets up and down narrow steps, but also have to attach and detach special pipes to the chute and wastewater storage tank during cleaning operations. This system eliminates the inconvenience and has an unprecedented advantage in that it can guide wastewater into the drum without any manual effort.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of this invention, with Figure 1 being a side view, Figure 2 being a front view, and Figure 3 being a front view.
The figure is a central vertical sectional view of the lid, and FIG. 4 is a schematic diagram of the air supply source. 3a...Discharge chute, 3b...Auxiliary chute, 5...Sewage storage tank, 7...Socket, 10
... Lid, 17 ... Discharge port, 19 ... Hose, 24
...Air supply source.

Claims (1)

[Scope of utility model registration request] A sewage storage tank is provided directly below the chute, and one end of a hose is connected to the outlet of the sewage storage tank. In a concrete mixer vehicle, the concrete mixer vehicle is connected with an air supply source that forces air into a sewage storage tank having a sealed reception port to force the sewage in the sewage storage tank to the outside via the hose. Cleaning sewage treatment equipment.