JPH0630835B2 - Screen residue dehydrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention squeezes and dewaters a screen residue scraped up and removed from a water channel of a sewage treatment plant, a pump station, etc. in a pressure dewatering unit,
Further, in the screen residue dehydrator in which a cylindrical conveying path extending obliquely upward is connected to the downstream side of the pressure dehydration section, the pressure generated inside the screen residue is kept constant, and more reliable dehydration is possible. The present invention relates to a screen residue dehydrator.

[Conventional technology]

As a dewatering device for dewatering the screen residue collected from a sewage treatment plant or the like and transferring the screen residue as it is and then transferring it as it is, Japanese Patent Publication No. 57-43.
049 and Japanese Patent Application Laid-Open No. 1-117118.

All of these devices dehydrate and convey the screen residue by pushing the screen residue upward and downward from a pipe having an upslope. Most or all of the steps of screen residue dehydration and transfer are carried out in a pipe. Therefore, there are advantages that the odor of the screen residue does not leak to the surrounding environment and the screen residue does not come into contact with the eyes of workers such as workers.

[Problems to be Solved by the Invention]

By the way, in these prior arts, the transport path is a pipeline in any of the examples, and the dehydration action of the screen residue is performed by the pressure applied to the screen residue in the pipeline. The pressure applied to the residue is caused by the movement resistance of the screen residue in the tube. Then, by pressing the screen residue,
The internal pressure of the screen residue rises, water is released, and is discharged to the outside, whereby it is dehydrated. However, the screen residue contains food residues, toilet paper, human hair, fibers, human feces, etc., and its properties are not constant, and the frictional resistance between the inner wall of the transport cylinder is significantly different, and its fluidity is also changed. . Therefore, with the conventional method of dehydrating the straight pipe part or the stepped pipe part, the resistance to the change of the screen residue cannot be made constant, so the property of the screen residue changes and the applied pressure also changes. In addition to the drawback that predetermined dehydration cannot be performed, the screen residue that has been dehydrated under pressure may expand and block the inside of the pipe when it is conveyed in the conveyance path.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a screen residue dewatering device that always produces a constant internal pressure in the screen residue even when the property of the screen residue changes, and enables reliable dewatering.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a screen residue having a pressure dehydration unit for compressing and dehydrating the screen residue recovered from a sewer or the like in a pipe, and a cylindrical transport path connected to the pressure dehydration unit. In the dehydrating apparatus, the pressurizing and dehydrating section is connected to the cylindrical transport path by a bent cylindrical back pressure section, and the bent outer peripheral wall of the back pressure section is swung by the pressing means. The main point is that it is composed of a back pressure plate.

[Work]

The internal pressure of the screen residue is adjusted so that it is always constant even if the properties of the screen residue are changed by the back pressure plate that swings the curved outer peripheral wall of the back pressure portion by the pressurizing means. Even if the property of the residue changes, it is possible to perform a certain amount of dehydration.

〔Example〕

Hereinafter, a screen residue dehydrator of the present invention will be described with reference to the illustrated embodiment.

In the figure, reference numeral 1 denotes a hopper, and the screen residue scraped up and collected from a water channel such as a sewage treatment plant or a pump station that is put into the hopper 1 is continuously or intermittently supplied to a pressure dehydration unit A.

The hopper 1 is arranged above the pressure dehydration unit A.

At the back of the pressure dehydration unit A, a pressure unit 2 provided with a hydraulic cylinder (or screw) 3 for compressing and dehydrating the screen residue supplied from the hopper 1 is provided.

This hydraulic cylinder 3 is supported by a cylinder bracket 3a provided in the pressurizing section 2, and a piston 3b is provided at the tip of the rod of this cylinder 3, and when this cylinder 3 is operated, this piston 3b is pressed into a cylindrical shape. The screen residue supplied from the hopper 1 is moved forward and backward through the dehydration section A to be intermittently squeezed for dehydration.

Therefore, small-sized or slit-shaped drainage holes 2H, 2H ... Are drilled on the lower side peripheral surface of the cylindrical pressure dehydration section A corresponding to the lower position of the hopper 1, and the hopper 1
If necessary, on the extension line of the pressurized dehydration section A on the downstream side,
A cylindrical drainage screen 4 is provided.

A back pressure portion B formed of a bent tube 5 that is cylindrical and bent is connected to the downstream side of the pressurization / dehydration portion A, and the wall of the bent outer peripheral side of the back pressure portion B is constituted by a back pressure plate 6.

The back pressure plate 6 of the back pressure portion B supports the lower end of the back pressure plate 6 on the bending tube 5 so as to be swingable by a shaft 6S, and applies pressure to the back pressure plate 6 via a bracket 7 protruding from the upper rear surface of the back pressure plate 6. A hydraulic cylinder 8 as a pressure means is provided, and by operating this cylinder 8, the back pressure plate 6 is advanced into the bending pipe 5 according to the applied pressure, and the required pressure is applied to the screen residue supplied into the bending pipe 5. I'll call it.

That is, the rod end of the cylinder of the hydraulic cylinder 8 as the pressurizing means is locked to the bracket 7, and the back pressure plate 6 can be swung from the solid line position in FIG. Eggplant The back pressure applied to the screen residue by the back pressure plate 6 can be adjusted by the hydraulic pressure acting on the cylinder 8. When the back pressure plate 6 is stored in a retracted state, the bending tube 5 has a divergent tapered shape. Becomes

A downstream side of the back pressure portion B is connected to a conveyance path C which is cylindrical and has a tapered front end.

The transport path C is mainly composed of a tubular transport tube 9, and the transport tube 9 is arranged vertically or inclined, and
The cross-sectional shape is circular, rectangular, or the like.
When the transfer tube 9 is a cylindrical tube, the uniformity of the applied pressure is excellent, and when the transfer tube 9 is a rectangular tube, the uniformity of the pressure is slightly inferior to the cylindrical tube, but it is excellent in manufacturability and operability.

Further, in order to carry the screen residue after dehydration more smoothly, a low-friction material such as a high-density polyethylene thin film may be attached to the inner surface of the tube, or a fluororesin processing may be performed.

FIGS. 4 and 5 show another embodiment of the screen residue dehydrator of the present invention. In FIG. 4, one cylinder 8 is provided on each side of the bending tube 5, and a total of two cylinders are provided. FIG. 5 shows the cylinder 8 which is installed to reduce the load, and the cylinder 8 is protected so that runoff water (dirt water) does not reach the cylinder 8 during dehydration. In this case, the cylinder rod of the cylinder 8 and the back pressure plate 6 are provided.
The spaces are linked by a link L.

〔The invention's effect〕

According to the present invention, with a very simple structure, the back pressure plate is swung by the pressing means according to the change in the property of the screen residue to change the opening degree and the curvature of the back pressure portion.
It is possible to constantly generate a constant internal pressure in the screen residue and improve the dehydration efficiency. Further, since the curved outer peripheral wall of the back pressure portion is configured as a back pressure plate, it is possible to reliably and smoothly carry the screen residue after dehydration, and further, when the back pressure plate is in the stored state. Since the back pressure plate is integrated with the bending tube, the resistance of the bending tube can be made extremely small.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged cross-sectional explanatory view of an essential part of a screen residue dehydrator of the present invention, FIG. 2 is a cross-sectional view of a back pressure portion, and FIG. 3 is a general schematic explanatory view. 4 and 5 are views showing another embodiment of the back pressure part of the screen residue dehydrator of the present invention. A is a pressure dewatering unit, B is a back pressure unit, C is a conveying path, 2 is a pressure unit, 3 is a hydraulic cylinder, 3 is a piston, 4 is a drain screen, 5 is a bent pipe, 6 is a back pressure plate, and 8 is a back pressure plate. Hydraulic cylinder,
9 is a carrier pipe.

Claims (1)

[Claims] 1. A screen residue dehydrator having a pressure dehydration unit for compressing and dehydrating screen residue collected from a sewer or the like in a pipe, and a screen residue dehydration apparatus having a cylindrical transport path connected to the pressure dehydration unit. The pressurizing / dehydrating section and the tubular conveying path are connected by a bent tubular backpressure section, and the bent outer peripheral wall of the backpressure section is constituted by a backpressure plate which is swung by a pressing means. A screen dewatering device characterized by: