JPH03181400A - Screen residue dehydration equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for compressing and dewatering screen residue scraped up and removed from waterways of sewage treatment plants, pumping stations, etc., and a pipe extending obliquely upward on the downstream side of the compressed and dehydrated water. In a dewatering device that is connected to a conveyor tube of the shape of the shape, a back pressure plate is installed on the outer periphery of the bent part of the base of the conveyor tube to keep the pressure generated inside the screen residue constant and to enable more reliable dewatering. This relates to dehydration equipment.

[Conventional technology]

As a screen residue dehydration conveyance device that dehydrates screen residue collected from sewage treatment plants, etc., and transports it as it is,
Japanese Patent Publication No. 57-43049 and Japanese Patent Publication No. 1-1171
There is one described in Publication No. 18.

All of these devices dewater and transport the screen residue by pushing it upward from the bottom of a pipe with an upward slope, and most or all of the process of dewatering and transporting the screen residue is performed inside the pipe. This method has the advantage that the odor of the screen cleaner does not leak into the surrounding environment, and the screen residue does not come into contact with the eyes of workers and other people.

[Problem to be solved by the invention]

However, in all of these conventional techniques, the conveyance path is a pipe, and the dehydration of the screen residue is performed by pressure applied to the screen residue in the pipe. This is caused by the resistance to movement of the fluid within the tube. Due to the pressurization, the internal pressure of the screen residue increases, and moisture is released and discharged to the outside.This causes dewatering. However, screen residue is a mixture of food particles, toilet paper, hair, fibers, human excrement, etc.
Its properties are not constant, and the frictional resistance between it and the inner wall of the conveying cylinder varies greatly, and its fluidity also changes. Therefore, with the conventional method of dewatering using straight pipe sections or stepped pipe sections, it is not possible to maintain a constant resistance against changes in the screen residue, so if the properties of the screen residue change, the applied pressure will also change, and the specified pressure will change. There is a drawback that dewatering cannot be performed, and the screen residue that has been dehydrated under pressure may swell when being conveyed through the conveying path, thereby clogging the inside of the pipe.

The object of the present invention is to always generate a constant internal pressure on the back pressure plate even if the properties of the screen residue change, thereby ensuring reliable dewatering.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an apparatus for compressing and dewatering screen residue collected from a sewage channel or the like in a pipe, and conveying the screen residue through an extended pipe. A back pressure plate that maintains the pressure generated inside the screen residue at a constant level is installed at the base of the cylindrical conveyance path connected to the pressurized dewatering section and on the outside of the bent part, and the pressure generated by the extrusion piston for screen sake pressing is applied. After the screen residue has been reliably dehydrated at the base of the conveyance path,
The gist is to transport.

[For production]

The internal pressure of the screen residue is generated by the pressing force of the piston and also by the back pressure plate installed at the bent part of the cylindrical conveyance path base, so that the pressure remains constant even when the properties of the screen residue change. To enable constant dehydration even if the properties of residue change. Further, after pressurized dehydration at the bent portion of the base of the conveyance path, the material is smoothly conveyed within the linear conveyance path.

(Example) The present invention will be explained below based on the illustrated embodiments.

In the figure, l is the hopper of the screen residue dewatering conveyance device, and the screen residue scraped and collected from the waterways of sewage treatment plants, bong plants, etc. is continuously or intermittently supplied to the pressurized dehydrator through this hopper 1. supply to Is this hopper l a pressurized dehydrator? ! It is installed protrudingly on the top of 2, and
This pressurized dewatering device 2 is equipped with a hydraulic cylinder (or screw) 3 for compressing and dewatering the screen residue supplied from the hopper 1. This hydraulic cylinder 3 is supported by a cylinder bracket 3a provided inside the dewatering device, and a piston 3b is provided at the tip of the rod of this cylinder 3. When the cylinder is operated, this piston 3b moves inside the cylindrical dehydrating device 2. The screen residue supplied from the hopper 1 is moved forward and backward intermittently to be compressed and dehydrated. Therefore, the lower peripheral surface of the cylindrical dewatering device 2, which is located at the lower part of the hopper 1, has small holes or slit-shaped drainage holes 2H, 2H...
A cylindrical drainage screen 4 is provided on the downstream side of the hopper 1 on the extension line of the dehydration bag W12, if necessary. A cylindrical and bent back pressure part B is connected to the downstream end of the pressurizing part A of the dewatering device equipped with a hydraulic cylinder 3, and a back pressure plate 6 is provided on the bent outer surface of this back pressure part B. At the same time, a conveying path C is connected to the back pressure part B, which is cylindrical and has a tapered shape with a widening tip.

In this back pressure part B, an opening 5H is provided in a part of the bent tube 5, that is, on the bent outer surface, and a back pressure plate 6 is fitted into this opening 5H.
The lower end of the back pressure is swingably supported on the bent pipe 5 by a shaft 6S, and a bracket 7 is provided to protrude from the upper back surface of the back pressure plate 6.
A back pressure hydraulic cylinder 8 is provided through the cylinder 8, and by operating this cylinder 8, the back pressure plate 6 is advanced into the bent pipe according to the pressurizing force, and a required back pressure is applied to the screen residue supplied into the pipe 5. Make sure to keep track of each other.

Further, the back pressure plate can also be provided on the inner surface of the bent portion.

A hydraulic cylinder 8 for back pressure is fixed to the conveyance path side or the main body frame side, and the rod end of this cylinder is locked to the bracket 7, and by operating this cylinder 8, the back pressure plate is moved from the solid line position in Figure 1 to the chain line. Make it possible to move (swing) to different positions. Furthermore, this I! The pressure can be adjusted by the pressure of the hydraulic pressure applied to the cylinder 8, and the force can be weakened,
When in the open state, everything from the forward end of the piston to the terminal end of the conveyor pipe becomes a tapered shape.

The conveyance path C is mainly composed of a cylindrical conveyance tube 9, and this conveyance tube 9 is arranged vertically or inclined, and its shape is cylindrical or rectangular. . When the conveying tube 9 is cylindrical, it has excellent uniformity of pressure, and when it is a rectangular tube, the uniformity of pressure is slightly inferior to that of a cylindrical tube, but it is superior in terms of manufacturability and cleanability.

Furthermore, in order to more smoothly transport the screen pickles after dehydration, the inner surface of the tube may be coated with a low-friction material, such as a thin film of high-density polyethylene, or treated with Teflon.

4 and 5 are different embodiments of the back pressure device. In FIG. 4, two cylinders are arranged, one on each side, to ease the pressure burden. In Figure 5, the cylinder is protected from spilled water (sewage) during dewatering, and in this case, the cylinder rod and back pressure plate are connected by a link.

〔Effect of the invention〕

According to the present invention, a bent 11 pressure section is provided between the pressurized dehydration section and the conveyance path, and at the base end of the conveyance path, and this IV
A back pressure plate that can be adjusted with a hydraulic cylinder is installed on the outside of the bend of the pressure part to generate back pressure on the screen, so the water pressurized and separated by this back pressure part flows down to the lower area. Moreover, by changing the opening degree and curvature of the pressure section 1', the dewatering efficiency can be improved and the resistance in the conveying path can be suppressed. Furthermore, the resistance when the back pressure plate is fully opened is extremely small, which has the advantage of preventing clogging in the conveyance path and ensuring smooth transportation in screen soaking after dewatering.

[Brief explanation of drawings]

Figure 1 is an enlarged cross-sectional view of the main parts of the pressurized dewatering device, Figure 2 is a cross-sectional view of the back pressure device, Figure 3 is a schematic diagram of the whole, and Figures 4 and 5 are the back pressure device. FIG. 2 is a pressurized dewatering device, 3 is a hydraulic cylinder, 3b is a piston, 4 is a drain screen, 5 is a bent pipe, 6 is a back pressure plate,
8 is a hydraulic cylinder for back pressure, and 9 is a conveying pipe.

Claims (1)

[Claims] (1) In a device that compresses and dehydrates screen sludge collected from sewage channels, etc. inside a pipe, and then transports it inside an extended pipe, a back pressure plate is applied to keep the pressure generated inside the screen sludge constant. It is installed at the base of the cylindrical conveyance path connected to the pressure dehydration section and outside the bent part, and is used to ensure that the screen residue is dehydrated at the base of the conveyance path by the pressurizing force of the extrusion piston for squeezing the screen residue, and then transported. Features: Screen residue dehydration equipment.