JPH034999A - Sludge sucking apparatus - Google Patents

Abstract

PURPOSE:To permit sludge to be discharged rapidly even from the sewage in a well liquid state by a method wherein a tank is provided with an air release valve fitted with a check mechanism which is brought into communication with an operating chamber and outside air when a piston moves in a position near the end of the tank on the door side and wherein a door is provided with a contacting piece releasably engageable with the air release valve. CONSTITUTION:To discharge sludge from the sewage in a well liquid state, the valve 4c of a sewage run-off pipe 4b provided below a door 1b is opened instead of the door 1b. At the same time, air is supplied from a compressor into an operating chamber 3 to apply pressure to the inside of a sludge chamber 4 by a piston 2. At this time, since an air release valve contacting piece 6 of the door 1b is held against the lid 5a of an air release valve 5, the air release valve 5 will not open even when the pressure of the sludge chamber 4 becomes higher and, by applying pressure to the sewage, it is discharged rapidly from a tank 1. Upon completion of sewage discharge, the compressor is stopped, the excessive high pressure air is forced out from the sewage run-off pipe 4b and the inner pressure of the sludge chamber 4 is reduced to atmospheric pressure, thereby bringing the operation to an end.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a sludge suction vehicle, and particularly relates to a technique for discharging sludge from a sludge chamber.

[Conventional technology]

A sludge suction device transports the sucked sludge to another location and discharges it, and due to the nature of its work, the device is mounted on a vehicle and manufactured as a sludge suction vehicle.

When this sludge suction truck discharges the sludge sucked into the tank, it first opens the door at the rear end of the tank, lifts the tank diagonally like a dump truck, and discharges the sludge inside. Another method is to provide a piston that slides inside the tank, move the piston using a hydraulic cylinder, etc., and open a door at the rear end of the tank to discharge the sludge.

However, in the case of a single-type dump truck, the heavy tank is lifted diagonally, so the vehicle lacks stability in areas with poor footing. Further, in the case of the hydraulic cylinder type, there was a problem that the device was expensive.

As a solution to this problem, a sludge suction device as shown in FIG. 2 is known. In this system, the inside of the tank is divided into a working chamber and a sludge chamber by a piston, and the differential pressure between the working chamber and the sludge chamber drives the piston to discharge sludge.

This will be explained below with reference to the drawings. Bottomed cylindrical container 1
A is provided with a door body 1b on the right side that opens and closes the open end,
A tank 1 is formed by this cylindrical container 1a and the door body 1b. A piston 2 is fitted in the tank l so as to be slidable along the central axis direction of the cylinder, and the piston 2 divides the inside of the tank 1 into an operating chamber 3 on the bottom side and a sludge chamber 4 on the door body 1b side. It is divided. Working chamber 3. The sludge chamber 4 has pipes 3a and 4a.
A compressor and a vacuum pump (not shown) are connected through the piston 2, and the internal pressure can be increased or decreased.
can slide from the high pressure side to the low pressure side due to the difference in internal pressure between the working chamber 3 and the sludge chamber 4. Also door body 1b
Below the sewage discharge pipe 4b communicating with the sludge chamber 4 and a valve 4c.
is provided.

To discharge sludge into this device, if the sludge is sewage with good fluidity, open the valve 4c provided in the sludge chamber 4 without opening the door 1b, and open the sewage discharge pipe 4b. is opened, and at the same time compressed air is sent in from the pipe 4a leading to the sludge chamber 4 to increase the pressure in the sludge chamber 4 and discharge the sewage.

However, if the fluidity of the sludge is poor, it cannot be discharged from the sewage discharge pipe 4b, and will be discharged as follows.

First, the door 1b at the rear end of the tank is opened and compressed air from the compressor is sent into the working chamber 3. The pressure inside the working chamber 3 rises above atmospheric pressure, the piston 2 moves toward the door body 1b, and the sludge is discharged from the tank 1. When the piston 2 moves to the position indicated by the two-dot chain line 2', the evacuation is completed, and then the highly pressurized air in the working chamber 3 is sucked in by the vacuum pump. Eventually, the pressure inside the working chamber 3 drops to atmospheric pressure.

The vacuum pump continues suctioning, and when the pressure inside the working chamber 3 drops below atmospheric pressure, the piston 2' begins to move to the left in the figure and returns to the predetermined position 2, completing the work.

In this device, since the pressure receiving area of the piston 2 is large, the piston can be easily operated even if the differential pressure between the working chamber 3 and the sludge chamber 4 is small.

[Problem to be solved by the invention]

However, in the above technology, in order to return the piston 2 to the predetermined position after discharging the sludge, the pressure within the working chamber 3 must go through the following pressure states in order: pressurization → atmospheric pressure → depressurization. There was a drawback that it took time for the piston 2 to return to its original position.

The present invention has been made in view of the above facts, and aims to provide a sludge suction device that can quickly return the piston after discharging sludge and does not affect the discharge of sewage with good fluidity. .

[Means to solve the problem]

In order to achieve the above object, the present invention provides a tank consisting of a cylindrical container with a bottom and a door body for opening and closing the open end of the container, an operating chamber that can independently pressurize and depressurize the inside of the tank, and a door. In a sludge suction device, the piston is divided into a sludge chamber on the body side, and has a piston that slides in the tank due to the differential pressure between the working chamber and the sludge chamber, and a sewage discharge pipe installed in the sludge chamber. An exhaust valve with a check mechanism that communicates from the working chamber to the outside air is provided in the tank at a position moved to the vicinity of the end, and the door body contacts the exhaust valve when closed to maintain the closed state, and the door body opens. The door body is sometimes provided with an exhaust valve abutting piece that separates from the exhaust valve.

[For I1mo] When discharging sludge with poor fluidity, first open the door and then raise the pressure inside the working chamber to above atmospheric pressure.

The piston is pushed by the pressure inside the working chamber and begins to move toward the sludge chamber, and sludge discharge begins. When the piston moves to near the end of the tank on the sludge chamber side, sludge removal is completed, and at the same time, the working chamber is communicated with the atmosphere through the exhaust valve.
The pressure inside the working chamber is immediately reduced to atmospheric pressure. After this, the pressure inside the working chamber is reduced, but since the exhaust valve has a check function, even if the pressure inside the working chamber is reduced, atmospheric air will not enter, and the piston can immediately start moving toward the working chamber, quickly reaching the specified position. can return to the position.

On the other hand, if the sludge is sewage with good fluidity, the sewage discharge pipe of the sludge chamber is opened without opening the door, and at the same time the inside of the sludge chamber is pressurized. Since the exhaust valve is held in a closed state by the exhaust valve contact piece, pressurized air does not flow out from the exhaust valve, and the sewage is quickly discharged from the sewage discharge pipe in a pressurized state.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1
A is a cylindrical container with a bottom, and 1b is a door body, which together form the tank 1. The upper end of the door body 1b is connected to the container 1a by a hinge 1c, and the door body 1b is connected to the container 1a by a hinge 1c, and extends from the closed position indicated by the solid line to the chain double-dashed line 1b'.
Open and close tank 1 by opening it to the position. A piston 2 is fitted inside the tank l so as to be freely slidable along the axial direction.
and a sludge chamber 4 on the door body 1b side.

A piping 3a is connected to the working chamber 3, which is connected to a compressor and a vacuum pump (not shown), so that gas such as air can be supplied or sucked into the working chamber 3, and pressurization and depressurization can be freely performed. ing. The sucked sludge is put into the sludge chamber 4, and a compressor and a vacuum pump are also connected to the pipe line 4a of the sludge chamber 4, and pressurize the sludge chamber 4 independently of the working chamber.
The structure also allows for pressure reduction. Therefore, the piston 2 moves from the high pressure side to the low pressure side due to the pressure difference between the working chamber 3 and the sludge chamber 4. Note that two pipes 3a and 4a may be provided, one for the compressor and one for the vacuum pump. Furthermore, by switching the pipe line 3a or 4a to the discharge side and the suction side of one vacuum pump, it is also possible to create a configuration in which the working chamber 3 and the sludge chamber 4 are pressurized and depressurized by a single pump.

The piston 2 consists of an arch-shaped disc 2a, a piston guide ring 2b, and a connecting part 2c that connects the two.
It is slidable in the axial direction from the position indicated by the solid line 2 to the position indicated by the two-dot chain line 2'.

Reference numeral 5 denotes an exhaust valve, which is provided near the end of the tank l on the door body 1b side. The lid 5a whose upper end is pivotally supported by a hinge 5b serves as a check mechanism for the exhaust valve 5, and when the atmospheric side is at high pressure, the M5a
is pressed to close the exhaust valve 5, and when the pressure inside the tank 1 is high, the exhaust valve 5 is opened by moving away from the lower part of H5a. Note that the exhaust valve 5 is not limited to the illustrated example, and may be any other type of valve as long as it is equipped with a check mechanism.

An adjustable length exhaust valve contact piece 6 formed by combining a bolt and a nut is attached to the door body 1b. The tip of the piece 6 abuts against M5a and holds the exhaust valve 5 in a closed state.

When the door body tb is in the open state shown by the two-dot chain line 1b', the exhaust valve contact piece 6 moves to the position 6', and the exhaust valve 5 acts as a valve having the above-mentioned check mechanism.

Next, a case will be described in which the sludge suction device discharges non-fluid sludge from the sludge chamber 4. First, the door body 1b of the tank 1 is opened, and air is fed from a compressor (not shown) through the piping 3a to increase the pressure on the working chamber 3 side. The piston 2 starts moving toward the door body 1b while discharging sludge, and when it moves to the position indicated by the two-dot chain line 2', the working chamber 3 and the exhaust valve 5 are closed.
The two are connected. The exhaust valve contact piece 6 is separated from the exhaust valve 5 by 6
', and the pressure inside the working chamber 3 is high, the exhaust valve 5 opens, the air inside the working chamber 3 blows out all at once, and the inside of the working chamber 3 rapidly drops to atmospheric pressure, causing the piston to 2
stops moving. That is, the position of the exhaust valve 5 is determined so that the discharge of sludge is completed at this position. After discharging the sludge, the pressure inside the working chamber 3 is reduced using a vacuum pump or the like. Conventionally, a vacuum pump was used to reduce the pressure from pressurized to atmospheric pressure, but this took a considerable amount of time.

In the present invention, by providing the exhaust valve 5, this pressure reduction time becomes O, and the pressure inside the working chamber 3 is reduced from atmospheric pressure at the same time as the vacuum pump is activated. Since the pressure inside the working chamber 3 is reduced, the lid 5a is attracted, and the check mechanism operates to close the exhaust valve 5, preventing outside air from entering. On the other hand, since the door body 1b is open, the sludge chamber 4 remains at atmospheric pressure. Then, the piston 2 moves to the left in the figure due to the differential pressure between the working chamber 3 and the sludge chamber 4, and returns to the position indicated by the solid line. After this, if the door body 1b is closed, the sludge discharge work is completed.

Next, a description will be given of the discharge of sewage in which the sludge has good fluidity.

In this case, the valve 4c of the sewage discharge pipe 4b provided below the door body 1b is opened without opening the door body 1b.

At the same time, air from the compressor is introduced to pressurize the inside of the sludge chamber 4. Since the exhaust valve contact piece 6 of the door body ib presses the lid 5a of the exhaust valve 5, the exhaust valve 5 does not open even if the pressure in the sludge chamber becomes high, and the sewage is pressurized and immediately discharged from the tank. do. When discharge of sewage is completed, the compressor is stopped and the sewage discharge pipe 4b is opened.
The remaining high-pressure air is pushed out, and the pressure inside the sludge chamber 4 drops to atmospheric pressure, completing the work.

〔Effect of the invention〕

As explained above, in conventional equipment without an exhaust valve, suction is used to reduce the pressure in the working chamber from the high pressure state at the end of sludge discharge to atmospheric pressure using a vacuum pump, etc., which takes a very long time. In contrast, in the present invention, the pressure can be rapidly reduced to atmospheric pressure using an exhaust valve, and the vacuum pump only needs to reduce the pressure from atmospheric pressure, so the working time for sludge discharge can be significantly shortened.

In addition, if the sludge has good fluidity and can be discharged without opening the door, the action of the exhaust valve can be suppressed and the sewage can be discharged under pressure, so that the sludge can be discharged quickly depending on the type of sludge. This has the extraordinary effect of making it possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing the configuration of an embodiment of the sludge suction device of the present invention, and FIG. 2 is a front view showing the configuration of a conventional example of the sludge suction device. 1...Tank, la...Cylindrical container, ■b...Door body, 2...Piston, 3...Working chamber, 4...Sludge chamber, 4b...Sewage discharge pipe, 5...exhaust valve, 6...
Exhaust valve contact piece.

Claims (1)

[Claims] The tank consists of a cylindrical container with a bottom and a door that opens and closes its open end, and the inside of the tank is divided into an operating chamber that can independently pressurize and depressurize, and a sludge chamber on the door side. In a sludge suction device that has a piston that slides in the tank due to the differential pressure with the sludge chamber, and a sewage discharge pipe provided in the sludge chamber, when the piston moves to the vicinity of the end on the door body side, the working chamber The tank is provided with an exhaust valve with a check mechanism that communicates with the outside air from the tank, and an exhaust valve contact piece is attached to the door, which contacts the exhaust valve when the door is closed to maintain the closed state, and separates from the exhaust valve when the door opens. A sludge suction device characterized by being installed on the body.