JPH0742667A - Conveyor device for heavy viscous material - Google Patents

Abstract

PURPOSE:To provide a conveyor device excellent in durability and conveying efficiency by connecting a heavy viscous material conveying pipe to one ends of a pair of conveying cylinders through a change-over valve, and constituting these cylinders and the conveying pipe in the alternately connectable/separable state so as to reduce the contact area of the conveying body with the conveyed material. CONSTITUTION:A heavy viscous material conveying pipe 7 is connected to one ends of a pair of conveying cylinders 1 with built-in pistons 1a, that is, a pair of conveying cylinders 1 and the conveying pipe 7 are constituted in the alternately connectable/separable state. A conveyed material discharge port 4 is then connected to the valve chamber of a change-over valve 2. The change-over valve 2 is formed into conical shape. A conveyed material feed passage 2c is formed on the top side of the conical shape, and a conveyed material sump part is formed on the bottom part side of the conical shape. Since a pair of pistons 1a alternately repeat the push-out and suction strokes, the conveyed material is constantly pushed out from the change-over valve 2 to the conveying pipe 7, and at the same time, the conveyed material is supplied to the change-over valve 2 and a pair of hydraulic cylinders 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a conveying device for heavy viscous substances such as dewatered sludge of sewage.

[0002]

2. Description of the Related Art Conventionally, a screw pump generally called a snake pump is known for transporting a heavy viscous fluid such as sewage sludge. This snake pump rotates a screw-shaped rotor in a stator having an oval cross section. Further, a slurry pump for transporting a heavy viscous material, which includes a spiral impeller, is also known.

[0003]

However, in both the snake pump and the slurry pump described above, the rotor and the impeller rotate in the heavy viscous material that is to be conveyed, and this is the same as sewage sludge. When used in a slurry containing long hair or long fibrous materials, there is a problem that they are entangled with the rotor, and since the slurry containing mud contacts the rotor and the entire surface of the blade, they wear out in a short period of time and must be replaced. There must be.

[0004]

The present invention solves the above-mentioned problems by using a reciprocating pump having a small contact surface with the slurry and little friction with the slurry. The gist is that one end of a pair of transfer cylinders provided with pistons inside is connected to a transfer pipe of a heavy viscous material via a switching valve, and each of the pair of transfer cylinders is alternately connected to the transfer pipe. In addition to dissociation, a pressure feed pipe for a heavy viscous material is connected to the valve chamber of the switching valve. If the switching valve is formed in a conical shape, the conical top is connected to the conveying pipe, and the heavy viscous substance reservoir is formed in the bottom space, the conveyed substance can be transferred smoothly.

[0005]

The apparatus according to the present invention is configured as described above, and one of the pair of transfer cylinders operates to push out the heavy-viscosity transferred object that has been pressure-fed to the reservoir of the switching valve into the transfer tube. While being conveyed, the conveyed product is sucked into the other conveying cylinder, and when each of the conveying cylinders reaches its operation end point, the connection port of the switching valve is switched and the conveyed conveyed product is pumped. Regarding the switching of the switching valve, the switching valve may be rotated even if the switching valve is rotated. Since high pressure acts on this switching valve, the pressure is firmly applied to the transfer cylinder to hold the seal, but the pressure contact is released when the transfer path is switched.

Further, since the transfer material from the pressure feeding pipe is pushed into the switching valve and flows into one of the transfer cylinders, it is desirable that there be no obstacle in the reservoir portion.
It is effective to use a conical switching valve having a channel for transporting a heavy viscous substance in the axial direction at the top thereof. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0007]

1 is a schematic plan view of an essential part of a device for transporting heavy viscous material according to the present invention, in which reference numeral 1 is a pair of hydraulic cylinders for pumping a heavy viscous material. There is.
2 is a switching valve provided at the end of the hydraulic cylinder,
As shown in FIGS. 2 and 3, the fixed valve 2 a and the rotary valve 2 b are attached to the machine casing 3. And the rotary valve 2
The supply passage 2c provided inside b is alternately connected to the pair of hydraulic cylinders 1 and 1 via the passage 2d of the fixed valve 2a as the rotary valve 2b rotates. Reference numeral 2e is a pressurizing port of the conveyed product to the valve chamber 2f formed in the switching valve 2, and although not shown, the pressurizing port 2e is provided with a discharge port 4 for a heavy viscous substance such as a screw press.
Are always connected. Reference numeral 5 is a tightening cylinder that supports the conveyance reaction force.

Next, the configuration of the switching valve 2 will be described with reference to FIG.
Further, it will be described in more detail with reference to FIG. In FIG. 2, a cylindrical rotary valve 2b is fitted into a fixed valve 2a fixed to the machine frame 3 so that the rotary valve 2b can be rotated left and right around a support shaft 2g. On the other hand, the rotary valve 2b is supported at its tip end side by an adjusting bolt 6 so as to be rotatable with respect to the fixed valve 2a, so that the supply passage 2c provided inside can be alternately connected to the aforementioned passages 2d, 2d. I am doing it. FIG. 3 shows the rotary valve 2b.
Is configured in a conical shape so that the material to be fed into the switching valve 2 can be easily transported. 4 is a view of the valve seat of the fixed valve 2a taken along line AA of FIG. 3, and FIG. 5 is a view of the valve seat of the rotary valve 2b of FIG. 3 taken along line BB of FIG. The reference numeral 2h represents an oil groove.
In the figure, reference numeral 7 indicates a carrier pipe.

The apparatus according to the present invention is configured as described above, and in order to convey a heavy viscous substance such as sewage sludge using the device, the conveyed substance is press-fitted into the valve chamber 2f from the pressure inlet 2e. On the other hand, by operating the hydraulic cylinders 1 and 1, the conveyed material supplied to the valve chamber 2f is pushed out into the conveying pipe 7 by the piston 1a of the one hydraulic cylinder 1. At this time, the piston 1a of the other hydraulic cylinder 1 is retracted, and the conveyed product is sucked into the hydraulic cylinder 1.

That is, the pistons 1a, 1a of the hydraulic cylinders 1, 1 are set so that when one is in the extrusion process, the other is in the suction process.
The article is always pushed out into the conveying pipe 7 from the above, and the article is replenished to the switching valve 2 and the hydraulic cylinder 1 at the same time. For the switching operation of the switching valve 2, a switching valve 2 having four ports is used in the illustrated one, and by rotating the switching valve 2, a predetermined port is switched and connected to each system path. I have to. In addition, the shape of the switching valve 2 is cylindrical as shown in FIGS. 1 and 2,
In the one shown in FIG. 3, a conical one is used. Figure 3
The use of the conical shape shown in (1) makes the flow of the heavy viscous material in the switching valve 2 smooth, and is suitable for conveying a material containing impurities such as sewage sludge.

[0011]

As described above, in the apparatus according to the present invention, the area in which the carrier contacts the article is small compared to the conventional apparatus using a screw-shaped rotor or rotary blade, and Foreign matter does not get entangled, and there is little wear such as wear of the valve disc. Also, by using a rotary type switching valve, the sealing surface is minimized and it can be transported at high pressure for a long time. It can be transported over a distance. Further, by using a conical switching valve as shown in the figure, the transfer of the conveyed product in the valve body becomes smoother, and it is suitable for the conveyed product containing foreign matters such as sewage sludge.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a main part of an apparatus according to the present invention.

FIG. 2 is likewise a vertical cross-sectional side view of the switching valve portion.

FIG. 3 is likewise a vertical cross-sectional side view of a switching valve portion of another embodiment.

4 is a cross-sectional view taken along the line AA in FIG.

5 is a side view of the rotary valve in FIG. 3, taken along the line BB in the figure.
Viewed along the line.

[Explanation of symbols]

 1 Hydraulic Cylinder 1a Piston 2 Switching Valve 2c Supply Path 2f Valve Chamber 4 Discharge Port 7 Conveyor Pipe

Claims (2)

[Claims] 1. A transfer pipe 7 for a heavy viscous material is connected to one end of a pair of transfer cylinders 1 each having a piston 1a inside, through a switching valve 2 to connect the pair of transfer cylinders 1 and transfer pipes 7. A heavy viscous material conveyance device in which the connection and disengagement are alternately made, and a discharge port 4 of the conveyed article is connected to the valve chamber 2f of the switching valve 2. 2. The switching valve 2 is formed in a conical shape, a supply path 2c for the conveyed product is formed on the top side thereof, and a reservoir for the conveyed product is formed on the bottom side thereof. Conveyor for heavy viscous materials.