JPH05293495A - Vehicle for recovering sludge - Google Patents

Abstract

PURPOSE:To enable supplying sludge into a sedimentation vessel by sucking with a recovery hose without using a large amount of water and without deteriorating the sedimentation property of the sludge even for block type sludge having a high sedimentation rate. CONSTITUTION:More than one vacuum tank 3a, 3b equipped with discharge gates 14a, 14b, which are positioned on a sedimentation vessel 2 and open alternately, are installed. A suction hose 4 and a recovery hose 7 are connected to the vacuum tanks 3a, 3b through change-over valves 5, 8 which switch interlockingly with the discharge gates 14a, 114b to connect the hoses 4, 7 each other when either of the discharge gates 14a, 14b is closed, so that original water containing sludge is sucked up by the negative pressure of the vacuum tanks 3a, 3b. An overflow weir 16, which is operated interlockingly with the discharge gates 14a, 14b of the vacuum tanks 3a, 3b, is also installed in a sedimentation vessel 2 to depress the pulse of the original water in the sedimentation vessel which ocurrs when the original water is supplied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge collecting vehicle for dredging sludge in rivers, lakes and marshes, civil engineering sites, etc. or sludge pits for industrial waste.

[0002]

2. Description of the Related Art Conventionally, as an apparatus used for dredging sludge and sludge pits of this kind, there has been known an apparatus as disclosed in Japanese Patent Application Publication No. 176500.

That is, this one supplies high-pressure water sent from a high-pressure water pump to a jet pump provided in the middle of a recovery hose, and the jet pump sucks up raw water containing sludge such as sludge and sludge pits together with the high-pressure water. The sludge is conveyed to the settling tank through the collection hose, the sludge is separated and settled in the settling tank, and the dust and sludge are collected by the waste collection conveyor and the sludge collection conveyor provided in the settling tank. It takes the means of supplying clear water to the high-pressure water pump again.

[0004]

However, when the jet pump is used to suck up the raw water containing sludge as described above, if the amount of suction water is small, the water flow velocity in the recovery hose is reduced, and therefore, the lump form with a high sedimentation velocity is used. The sludge cannot be sucked and transported, and in such a case, a large amount of water is required.Therefore, at a sludge collection site with a small amount of water, it is necessary to carry the water to supply water. There was a point.

Therefore, an object of the present invention is to provide a sludge recovery vehicle equipped with a novel mechanism that does not require a large amount of water even when agglomerated sludge having a high sedimentation speed is sucked and conveyed in a recovery hose. Is to provide.

[0006]

In order to achieve the above-mentioned object, according to the present invention, a plurality of vacuum tanks having discharge gates located on a settling tank and opened and closed alternately are arranged. The suction hose and the collection hose are connected to the vacuum tank through a switching valve that switches in tandem with the discharge gate so that they are in communication when the discharge gate is closed. The overflow weir, which works in conjunction with the discharge gate, was provided.

[0007]

As a result, if the air in the vacuum tank is alternately exhausted through the suction hose by an air suction device such as a vacuum truck, the raw water containing the sludge at the sludge recovery site is recovered by the negative pressure in the vacuum tank. The raw water sucked into the vacuum tank alternately through the suction tank and the raw water sucked into the vacuum tank are supplied to the sedimentation tank as the discharge gate is opened and closed.

As described above, since the raw water is sucked up into the vacuum tank by using the negative pressure and the raw water is supplied into the settling tank by opening and closing the discharge gate, a large amount of water is generated even if the sludge is lumpy and has a high settling speed. Can be sucked and conveyed without using.

Further, the pulsation of the raw water in the settling tank, which is caused by the raw water supplied from the vacuum tank, is suppressed to a small level by the overflow weir that is opened and closed in conjunction with the discharge gate. It can be kept as low as possible.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, a sludge recovery vehicle A, which is an embodiment of the present invention, is disposed on a vehicle body 1 for sludge treatment, and a sludge treatment tank 2 is disposed above the tip of the sedimentation tank 2. A plurality of vacuum tanks (two in this embodiment) 3a,
3b and.

The vacuum tanks 3a and 3b are for continuously sucking up the raw water containing the sludge S from the sludge recovery site D by utilizing the suction force. Suction hose 4 for alternately sucking air to create a negative pressure in the vacuum tanks 3a and 3b
Are connected by pipes 6a and 6b through the switching valve 5.

At the same time, in the vacuum tanks 3a and 3b,
Recovery hose 7 for sucking up raw water containing sludge S
Are connected through the switching valve 8 by pipes 9a and 9b, respectively.

These switching valves 5 and 8 allow the suction hose 4 and the recovery hose 7 to communicate with the same vacuum tank 3a or 3b at the same time, and are interlocked so as to alternately repeat these operations. There is.

In this embodiment, the switching valves 5 and 8 are
Is configured as a separate valve, the switching valves 5 and 8 may be configured as an integrated multi-valve.

On the other hand, in the settling tank 2, a screw conveyor 10 for collecting the sludge S that has settled, and a sludge recovery conveyor 1 that drains the sludge S that is connected to this screw conveyor 10 and carries it out to the outside.
1 and a dust collecting conveyor 12 for removing dust and the like in the raw water.

Further, on the vehicle body 1, a transloading conveyor 13 (see FIGS. 2 and 3) for loading the sludge S carried by the sludge recovery conveyor 11 into the transport vehicle B is provided so as to be freely taken in and out. ..

The bottoms of the vacuum tanks 3a and 3b open into the settling tank 2, and these openings are alternately opened and closed in conjunction with the switching valve 5 of the suction hose 4 and the switching valve 8 of the recovery hose 7. Ejection gates 14a and 14b are provided.

A vacuum tank 3 is provided at the rear of the settling tank 2.
An overflow weir 16 that is vertically moved by a cylinder 15 is provided in conjunction with the discharge gates 14a and 14b of a and 3b.
It is connected to the return hose 17 through 6.

Reference numerals 18a and 18b in the figure denote level switches provided in the vacuum tanks 3a and 3b, respectively, and detect when the raw water in the vacuum tanks 3a and 3b reaches a predetermined level. The switching valves 5 and 8 are switched and the discharge gates 14a and 14b and the overflow weir 16 are opened and closed. Next, the operation will be described.

Prior to starting the work, the suction hose 4 of the sludge recovery vehicle A is connected to an air suction device such as a vacuum vehicle C, and the transshipment conveyor 13 is pulled out toward the bed of the transportation vehicle B (see FIG. 3). ).

Thereafter, the sludge recovery conveyor 11, the waste recovery conveyor 12 and the transshipment conveyor 13 of the sludge recovery vehicle A and the air suction device of the vacuum vehicle C are started.

If, for example, the discharge gate 14b of the vacuum tank 3b of the sludge recovery vehicle A is open,
The discharge gate 14a of the vacuum tank 3a is closed, and the switching valves 5 and 8 are interlocked with each other so that both the suction hose 4 and the recovery hose 7 communicate with the vacuum tank 3a side.

Therefore, the air in the vacuum tank 3a is sucked by the vacuum car C, and the raw water containing the sludge S from the sludge recovery site D enters the vacuum tank 3a through the recovery hose 7, the switching valve 8 and the pipe 9a. Will be sucked in.

When the raw water sucked into the vacuum tank 3a reaches a predetermined level, the level switch 18a detects this and the suction hose 4 and the recovery hose 7 are connected to the vacuum tank 3b so that the switching valve is connected. While switching 5 and 8, the discharge gate 14a is opened and the discharge gate 14b is closed.

As a result, this time, the raw water from the sludge recovery site D is sucked into the vacuum tank 3b, and in parallel with this, the raw water previously sucked into the vacuum tank 3a is passed through the discharge gate 14a to the sedimentation tank 2 It flows in.

Similarly, when the raw water in the vacuum tank 3b reaches a predetermined level, this is changed to the level switch 18b.
Detected by the switching valves 5 and 8 and the discharge gates 14a and 1
4b is returned to the original state, the raw water is sucked into the vacuum tank 3a, and the raw water in the vacuum tank 3b flows into the settling tank 2.

Since the raw water at the sludge collection site D is sucked into the vacuum tanks 3a and 3b by utilizing the suction force associated with the negative pressure, the sludge and dust contained in the raw water are relatively large lumps. However, it can be easily sucked and conveyed.

Thus, the dust in the raw water flowing into the settling tank 2 is removed to the outside by the waste collecting conveyor 12, and the sludge S is separated and settled in the settling tank 2 and collected by the screw conveyor 10 while sludge is collected. Collected at the base end of the recovery conveyor 11, the recovery conveyor 1
It is transported while being drained at 1 and transferred to the transshipment conveyor 13 and sent to the carrier B for loading.

When the discharge gates 14a and 14b are switched, pulsation may occur in the raw water in the settling tank 2 and the pulsation may impede the settling of the sludge S, which is interlocked with the discharge gates 14a and 14b. The overflow weir 16 that is operated to open and close is kept as low as possible.

By repeating the above operation, the sludge S at the sludge recovery site D is recovered one after another.

[0032]

As described above, according to the present invention, even a sludge having a high sedimentation speed can be sucked and conveyed by a recovery hose without using a large amount of water.

Further, the overflow weir working in conjunction with the discharge gate of the vacuum tank has an effect that sludge can be efficiently collected without hindering sedimentation.

[Brief description of drawings]

FIG. 1 is an overall view of a sludge recovery vehicle that is an embodiment of the present invention.

FIG. 2 is a diagram schematically showing a sludge treatment and recovery mechanism of the sludge treatment vehicle.

FIG. 3 is a diagram showing a sludge treatment situation of a sludge recovery vehicle according to the present invention.

[Explanation of symbols]

 A Sludge recovery vehicle B Transport vehicle C Vacuum vehicle D Sludge recovery site S Sludge 1 Vehicle body 2 Sedimentation tank 3a, 3b Vacuum tank 4 Suction hose 5, 8 Switching valve 7 Recovery hose 11 Sludge recovery conveyor 12 Garbage recovery conveyor 13 Transshipment conveyor 14a, 14b Discharge gate 16 Overflow weir 17 Return hose 18a, 18b Level switch

Claims (1)

[Claims] 1. A plurality of vacuum tanks, each of which is provided on a settling tank and provided with discharge gates which are alternately opened and closed, are provided, and a suction hose and a recovery hose are connected to these vacuum tanks, and the discharge gates are closed. At the same time, both hoses are connected to each other through a switching valve that switches in conjunction with the discharge gate so that both hoses are in communication, and an overflow weir that operates in conjunction with the discharge gate of the vacuum tank is provided in the settling tank. Sludge recovery vehicle.