JPH0712553B2 - How to operate the dust remover - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen residue dewatering / transporting apparatus for transporting screen residue, which has been scraped and removed from a water channel of a sewage treatment plant, a pump station, etc., to a predetermined high position while dehydrating in a duct, The present invention relates to a driving method in which a driving frequency is determined according to an inflow amount of screen residue.

[0002]

2. Description of the Related Art Conventionally, a screen residue collected from a sewage treatment plant or the like contains filth and has a high water content, and it is not suitable to put it in a hopper or an incinerator for collecting after treatment. It takes time. Therefore, it is necessary to wash the collected screen residue and dehydrate it until the water content falls below a predetermined level. Conventionally, the separation of the screen residue is carried out by a dust remover, the cleaning is carried out by a washing machine, the dehydration is carried out by a dehydrator, and the screen residue after the dehydration is carried by a carry-out machine to a hopper or an incinerator. In the method in which the screen residue is dehydrated with a dehydrator and then transported to a predetermined position with a transporter, the installation space for the device becomes large and it becomes difficult to seal the device for maintenance and inspection. Generally, it is an open type. For this reason, the work environment is deteriorated due to the scattering of foul odors. Also, supply screen residue in the closed duct,
After dehydration under pressure, the method of sending it under pressure is Japanese Patent Publication No. 46-2.
It is disclosed in Japanese Patent No. 6285.

[0003]

An excellent method is to separate and wash dust from dirty water in a closed duct, dewater it under pressure, and transport it as it is. Sewage is supplied to this device by pump-up or the like, and the screen residue is separated. The maximum value of this screen residue is predicted in advance, and the plunger inserted into the cylindrical screen is reciprocated periodically by a timer etc. at a frequency commensurate with it to remove the screen residue, dehydrate, and remove the cylindrical residue. It is transported by pushing it into a cylindrical duct connected to the screen. However, this screen residue amount, that is, the screen residue mixing rate is not constant,
Even if the mixing ratio is low, it operates at a set frequency, consumes a lot of energy, and adversely affects the life of the machine.

An object of the present invention is to detect the amount of screen residue flowing into the hopper of a screen residue dehydrator and operate the dehydrator according to the amount of screen residue to save energy and prolong the life of the device. To do.

[0005]

The present invention has been made to achieve the above object, and a cylindrical screen is provided at the discharge port of a hopper capable of temporarily storing a predetermined amount of screen residue, A dust removal dehydrator that pressurizes and dehydrates the screen residue that has flowed into the hopper with a plunger provided at the base end side of this cylindrical screen, and conveys it inside a transfer duct provided at the tip side of the cylindrical screen. In the above, the sensor detects the amount of screen residue supplied to the hopper, and the plunger is advanced by detecting that the water level has reached the set position, and the screen residue attached to the cylindrical screen is removed by the advance of the plunger. The gist is that it is dehydrated under pressure, transported, and then sequentially repeated.

[Function] When it is detected that the cylindrical screen has started to be blocked by the screen residue flowing into the hopper of the dehydrator when the water level reaches a preset amount, the hydraulic unit device is driven by this detection signal. The plunger is moved in the cylindrical screen at the lower part of the hopper in the protruding direction, and the screen residue adhering to the cylindrical screen is removed and pressed toward the conveying duct side under the back pressure for dehydration. Then, when the cylindrical screen is cleaned and the plunger is retracted, the inflow water temporarily stored in the hopper flows into the cylindrical screen again to be removed of dust. By repeating this operation in sequence, the dehydrator is operated in accordance with the amount of the screen residue mixed in to save energy, prolong the life of the machine, and improve the cleaning effect.

[0007]

The present invention will be described below with reference to the illustrated embodiments. In the figure, reference numeral 1 denotes a hopper which supplies sewage from a sewage treatment plant or the like into the hopper 1. In this case, the water is supplied into the hopper 1 by using a pump or the like, but it is possible to use another method, for example, by directly connecting a waste water pipe and supplying the water in the form of natural flow.

A discharge port 2 is provided in the lower part of the hopper 1, and a cylindrical screen 4 and a discharge port 2 of a pressure dewatering device 3 arranged in the lower part of the hopper 1 are connected to each other so that screen residue and water in the hopper are removed. Through the outlet 2 into the cylindrical screen 4. In this pressure dehydrator 3, a plunger 5 is arranged at the base end side of the cylindrical screen 4 and a cylindrical transport duct 6 is arranged at the other end, and the plunger 5 extends in the longitudinal direction in the cylindrical screen. The plunger diameter and the cylindrical screen diameter are determined so that when the plunger is projected, the discharge port 2 connected to the upper surface of the cylindrical screen can be closed when the plunger protrudes.

The plunger 5 is provided with a hydraulic cylinder and other pressurizing device 51. By driving the hydraulic cylinder 51, the plunger 5 reciprocates from the base end side to the tip end side of the cylindrical screen 4. .

The conveying duct 6 has a required diameter, length and height, a back pressure device 7 is provided in a part of the duct 6, and a pressing force is applied to the screen residue pushed into the duct by the plunger 5. It is given, dehydrated under pressure, and sequentially conveyed. A hopper or bag for receiving the screen residue after dehydration is provided at the tip of the transport duct 7. If the bag B is attached to the tip of the duct, the screen residue after dehydration can be directly packed.

Further, the hopper 1 is provided with a sensor 8 for detecting the clogging of the screen residue on the cylindrical screen. As the sensor 8, a water level gauge, a water pressure gauge, or the like can be used.

In the dust removing dehydrator configured as described above,
Sewage from a sewage treatment plant or the like is caused to flow into the hopper 1. In this case, the plunger 5 is in the retracted state and the discharge port 2 is open. When the cylindrical screen is blocked by the screen residue and the sewage in the hopper 1 reaches the set water level, it is detected by the sensor 8 such as a water level gauge, and the plunger 5
To move forward. As a result, the screen residue attached to the cylindrical screen is removed and dehydrated. Then, by driving the cylinder 51, the plunger 5 retreats, and the dirty water stored in the hopper flows into the cylindrical screen again to remove dust.

When the set water level is reached, the plunger 5 advances again to remove the next screen residue adhering to the cylindrical screen and dehydrate it. By repeating this operation in sequence, the dehydrator is operated in accordance with the amount of screen residue flowing in to perform pressure dehydration and convey the inside of the conveying duct.

[0014]

According to the present invention, the water tank is provided with a sensor (water level gauge or water pressure gauge), and it is detected that the cylindrical screen is blocked by the screen residue collected and the operating water level rises, and the hydraulic unit is activated. By operating the plunger, it is possible to save energy and prolong the life of the device by operating the plunger efficiently.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example of the present invention.

FIG. 2 is an operation flow chart.

[Explanation of symbols]

 1 Hopper 2 Discharge port 3 Pressurized dewatering device 4 Cylindrical screen 5 Plunger 6 Conveying duct 7 Back pressure device 8 Sensor

Claims (1)

[Claims] 1. A cylindrical screen is provided at an outlet of a hopper capable of temporarily storing a predetermined amount of waste water, and a plunger provided at a base end side of the cylindrical screen flows into the hopper. In a dust removal dehydrator designed to pressurize and dehydrate the screen residue and convey it through the transfer duct provided on the tip side of the cylindrical screen, the amount of screen residue captured by the cylindrical screen is adjusted to a fixed amount by the water level sensor. A method for operating a dust removing dehydrator, which is characterized in that when it reaches, the plunger is advanced to remove the screen residue adhering to the cylindrical screen, pressurize and dehydrate it, convey it, and repeat it in sequence.