JP2005169175A - Screen residue washing and dehydrating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen residue washing and dehydrating apparatus which can prevent an increase in equipment costs by making its apparatus configuration compact, and can reduce power costs and exhibit a high washing capacity by enabling smooth and sure performing of the conveyance, dehydration, and discharge of a screen residue. <P>SOLUTION: This screen residue washing and dehydrating apparatus comprises a hopper into which the screen residue is fed, a conveyance part for carrying the screen residue fed into the hopper by a transport screw conveyor, a washing part for carrying and washing the screen residue, conveyed by the transport screw conveyor by a wash screw conveyor, and a dehydration part for dehydrating the screen residue carried by the wash screw conveyor. The transport screw conveyor and the wash screw conveyor can rotate separately from each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In particular, the present invention relates to a sieve cleaning and dewatering apparatus suitable for cleaning and dewatering the sieve residue generated at a sewage pump station or a sewage treatment plant.

  In sewage pumping stations and the like, wastes such as plastic, hair, leaves, and wood fragments in the inflow raw water are removed with a dust remover in advance and sent to the treatment process. The separated matter by the dust remover or the like is called a sieve. In many cases, the sieve residue is eventually disposed of in landfills or incinerated.

  However, the sieve residue separated by a dust remover or the like contains a large amount of organic components such as filth, has a high moisture content, is unsanitary, and has poor handling properties. Also, in landfills and other disposal sites, it may cause odors and groundwater contamination.

  Therefore, in sewage pumping stations, etc., the sieve residue separated by a dust remover, etc. should be made relatively hygienic to prevent environmental pollution and to be dehydrated for the purpose of improving the handleability of the sieve. Has been done.

As related to the prior art, Japanese Patent Application Laid-Open No. 10-305298 (Patent Document 1) describes a washing water supply pipe for washing the sieve residue and a stirring washing chamber having a stirrer for stirring the washing water, and a water level adjusting overhead. A washing water discharge chamber having a weir and a washing water drain, a screen for separating the sieve from the washing water, a screw conveyor for conveying the separated sieve, a press unit for compressing and dewatering the conveyed sieve, and compression -It consists of a screen-type sieve removal device that has a carry-out part that carries out the dehydrated sieve residue. The stirring washing chamber and the washing water discharge chamber are separated by a screen-type sieve removal device, and the washing water in the stirring washing chamber is There is a description of a screen washing and dewatering device configured to pass through the screen of the screen type screen removing device and transfer to the washing water discharge chamber.
Japanese Patent Laid-Open No. 10-305298

  However, the sieve cleaning and dehydrating apparatus described in Patent Document 1 has the following problems.

  That is, the sieve cleaning and dewatering device described in Patent Document 1 is an apparatus in which a stirring cleaning chamber, a cleaning water discharge chamber, a screen, a screw conveyor, and a screen type sieve removing device are integrated. In this case, it is necessary to secure a sufficient volume for stirring the sieve, and the entire apparatus becomes large and the equipment cost increases. In addition, since the volume of the stirred cleaning chamber is large, the amount of cleaning water to be used is large, and the cost for treating the wastewater increases, resulting in an increase in running cost.

  Furthermore, the sieve cleaning and dehydrating apparatus described in Patent Document 1 performs the transfer, dehydration and unloading of the sieve with the driving force of the screw conveyor. The screw conveyor is arranged on one common shaft. Therefore, even if the screw pitch is adjusted, it is difficult to smoothly transport, dewater and carry out the sieve residue, which requires a large driving force and increases the power cost.

  The present invention has been made to solve the above-mentioned problems, and it is possible to prevent the increase in the equipment cost by adopting a compact apparatus configuration, and to smoothly and reliably carry the sieve, dehydrate and carry out the sieve. Accordingly, an object of the present invention is to provide a sieve cleaning and dehydrating apparatus having a high cleaning ability while reducing the power cost.

The above problems are solved by the following invention.
[1] A hopper into which a sieve is charged, a conveyance unit that conveys the sieve loaded into the hopper by a conveying screw conveyor, and a screw conveyor for washing the sieve that has been conveyed by the conveying screw conveyor A sieve cleaning and dehydrating apparatus comprising: a cleaning unit that performs cleaning while being transported by a carrier; and a dewatering unit that performs dewatering of the sieve that has been transported by the cleaning screw conveyor, wherein the screw conveyor for transporting and the cleaning A sieve washing and dewatering device characterized in that each screw conveyor can be rotated independently.
[2] In the above-mentioned [1], the washing screw conveyor shaft is passed through the hollow shaft of the conveying screw conveyor and connected to the washing screw conveyor driving device. .
[3] A sieve cleaning / dehydrating apparatus according to [1] or [2], wherein the conveying screw conveyor and / or the cleaning screw conveyor can be rotated forward and backward.

  According to the present invention, an increase in equipment costs can be prevented by adopting a compact device configuration, and power costs can be reduced by enabling smooth and reliable transport, dehydration, and unloading of sieve cake. A sieve cleaning and dewatering device having high cleaning performance is provided.

  Hereinafter, an example of the best mode for carrying out the present invention will be described.

  FIG. 1 is a schematic configuration diagram showing an embodiment of a sieve cleaning and dehydrating apparatus according to the present invention. As shown in FIG. 1, a sieve washing and dehydrating apparatus 20 according to the present invention includes a hopper 1 into which sieves are charged, and a conveyance unit 21 that conveys the sieve particles introduced into the hopper 1 by a conveying screw conveyor 2. And a cleaning unit 22 for cleaning the sieve transported by the transport screw conveyor 2 while transporting it by the cleaning screw conveyor 3, and dehydrating the sieve transported by the cleaning screw conveyor 3 And a dehydrating unit 23. Further, the sieve cleaning and dewatering device 20 is configured such that the conveying screw conveyor 2 and the cleaning screw conveyor 3 can rotate independently or in conjunction with each other.

  The sieve cake put into the hopper 1 is conveyed by the conveying screw conveyor 2 installed in the conveying unit 21 provided at the lower part of the hopper 1 and sent into the cleaning unit 22. Here, the conveying screw conveyor 2 conveys a sieve by rotating a rotating shaft 2b provided with a spiral screw 2a on the outer periphery thereof by a conveying screw conveyor driving device 7 which can be rotated forward and backward. I do. The conveying screw conveyor rotary shaft 2b is installed through the conveying unit 21 via a known bearing unit and a sealing unit, and the conveying screw conveyor installed outside the conveying unit 21. It is rotated by the driving device 7. Further, the spiral screw 2 a is provided so as to contact the inner wall of the transport unit 21.

  The sieve residue supplied into the cleaning unit 22 is cleaned by the cleaning water sprayed from the cleaning water spray nozzle 9 provided on the wall surface of the cleaning unit 22. Here, in order to perform cleaning more effectively, it is preferable that a plurality of the cleaning water injection nozzles 9 are provided so that the injection directions of the cleaning water are different from each other and are injected into the cleaning unit 22. The flow rate and pressure of the cleaning water are adjusted by a cleaning water adjustment valve 11 provided in the middle of the cleaning water supply pipe 10 for supplying the cleaning water to the cleaning water jet nozzle 9.

  The sieve residue in the cleaning unit 22 is conveyed by the cleaning screw conveyor 3 and is sent to the dehydrating unit 23 after organic components such as filth are removed. The cleaning screw conveyor 3 has a helical screw 3a provided on the outer periphery thereof, and the cleaning screw conveyor rotating shaft 3b is rotated by a cleaning screw conveyor driving device 8 which can be rotated in the forward and reverse directions. Transport. Here, for example, as shown in FIG. 1, the cleaning screw conveyor rotary shaft 3b is installed to penetrate through the inside of the transfer screw conveyor rotary shaft 2b having a hollow structure, and the transfer It is rotated by a cleaning screw conveyor driving device 8 installed outside the section 21 and the dehydrating section 23. The cleaning screw conveyor rotating shaft 3b is rotatably installed through the shaft of the conveying screw conveyor rotating shaft 2b via a known bearing portion and a seal portion. The helical screw 3 a is provided so as to contact the inner wall of the cleaning unit 22.

  As for the pitch interval of the screw 2a of the screw conveyor 2 for conveyance and the pitch interval of the screw 3a of the screw conveyor 3 for washing | cleaning, it is preferable to make the pitch interval of the screw 3a narrower than the pitch interval of the screw 2a, for example. The sieve sent from the transport unit 21 is subjected to a shearing action in a zone provided between the screw 2a and the screw 3a, and the string-like or fibrous sieve is subdivided, resulting in a cleaning effect. This is because it improves.

  A drain pan 5 is installed below the transport unit 21 and the cleaning unit 22 via the screen 4. Water and cleaning wastewater in the sieve are discharged from a drain port 6 provided in the drain pan 5, and drained. Sent to a processing facility.

  The washed sieve cake sent to the dewatering unit 23 by the cleaning screw conveyor 3 is dehydrated in the dewatering unit 23. The dewatering unit 23 can be configured by a back pressure pipe or the like provided on the downstream side of the cleaning unit 22 in the sieve pushing direction. As the back pressure pipe, for example, an elbow pipe or the like that is bent so as to extend upward at the end opposite to the connection end with the cleaning section 22 can be used.

  When the sieve pushed out from the washing part 22 passes through the dehydrating part 23, the sieve receives the compression from the back pressure pipe and the frictional resistance when the sieve moves through the back pressure pipe. It is fully dehydrated. The back pressure tube is preferably bent vertically upward, and reducing the diameter of the end opposite to the connection end with the cleaning unit 22 is also effective for more effective dehydration. .

  Hereinafter, an example of a method for washing and dehydrating a sieve using the sieve washing and dehydrating apparatus according to this embodiment will be described with reference to FIG.

  When the sieve to be washed and dehydrated is introduced into the hopper 1, the conveying screw conveyor 2 and the washing screw conveyor 3 start operation, and the sieve is sent from the conveying unit 21 to the washing unit 22. When the pitch interval of the screws 2a of the conveying screw conveyor 2 is wider than the pitch interval of the screws 3a of the cleaning screw conveyor 3, the rotational speed of the conveying screw conveyor 2 is lower than the rotational speed of the cleaning screw conveyor 3. It is preferable to set the amount of transport of the sieve per unit time to the same level. This is because it is difficult for transport troubles such as clogging of sieves to occur.

  The operation of the conveying screw conveyor 2 is stopped at the stage when all the sieves are fed into the cleaning unit 22, and only the cleaning screw conveyor 3 is operated. At this time, it is preferable to reverse the rotation direction of the screw conveyor 3 for cleaning, for example, every predetermined time. As a result, the sieve can be kept in the cleaning unit 22 for a predetermined time, and the cleaning effect of the sieve is improved by performing the cleaning reliably. In addition, since the mixing and stirring of the sieve in the cleaning unit 22 and the squeezing are simultaneously performed, the cleaning effect is improved. Furthermore, the effect of preventing clogging of the sieve in the transport unit 21 is improved by reversing the transport screw conveyor 2.

  In the cleaning unit 22, organic components such as filth contained in the sieve during mixing and stirring and demulsification are removed by the cleaning water sprayed from the cleaning water spray nozzle 9 provided on the wall surface of the cleaning unit 22. The removed organic components and the like pass through the screen 4 together with the cleaning water, flow into the drain pan 5, are discharged from the drain port 6 provided in the drain pan 5, and are sent to a waste water treatment facility or the like.

  The sieve that has been sufficiently washed by the washing unit 22 is transferred to the dehydrating unit 23 by simultaneously operating the conveying screw conveyor 2 and the washing screw conveyor 3 in the same rotational direction. The sieve transferred to the dewatering unit 23 is dehydrated by the compression received between it and the back pressure tube constituting the dewatering unit 23 and the frictional resistance when the sieve moves in the back pressure tube. The dehydrated sieve residue is discharged from the discharge end of the dewatering unit 23 by the extrusion pressure generated by the rotation of the conveying screw conveyor 2 and the cleaning screw conveyor 3. Here, it is preferable that the rotational speed of the conveying screw conveyor 2 is set to be lower than the rotational speed of the cleaning screw conveyor 3, and the transport amount of the sieve per unit time is set to the same level. This is because it is difficult for transport troubles such as clogging of sieves to occur.

  The discharge end of the dewatering unit 23 can be appropriately modified depending on the installation status of the present sieve cleaning and dewatering device.

It is a schematic block diagram which shows one Embodiment of the sieve washing | cleaning dehydration apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hopper 2 Screw conveyor for conveyance 2a Helical screw of screw conveyor for conveyance 2b Screw rotation shaft for conveyance 3 Screw screw conveyor for cleaning 3a Screw screw of washing screw conveyor 3b Screw rotation shaft for cleaning 4 Screen 5 Drain pan DESCRIPTION OF SYMBOLS 6 Drain port 7 Transfer screw conveyor drive device 8 Washing screw conveyor drive device 9 Washing water injection nozzle 10 Washing water supply piping 11 Washing water adjustment valve 20 Screen washing dehydration device 21 Conveying unit 22 Washing unit 23 Dehydrating unit

Claims (3)

A hopper into which the sieve residue is charged;
A transport unit for transporting the sieve cake put into the hopper by a transport screw conveyor;
A cleaning unit that cleans the sieve that has been transported by the transport screw conveyor while transporting by the cleaning screw conveyor,
A sieve washing and dehydrating apparatus comprising a dehydrating unit for dehydrating the sieve that has been conveyed by the washing screw conveyor,
The sieve cleaning and dehydrating apparatus, wherein the conveying screw conveyor and the cleaning screw conveyor can be independently rotated.   2. The sieve cleaning and dewatering apparatus according to claim 1, wherein the shaft of the cleaning screw conveyor is passed through the hollow shaft of the conveying screw conveyor and connected to the cleaning screw conveyor driving device.   The sieve cleaning and dehydrating apparatus according to claim 1 or 2, wherein the conveying screw conveyor and / or the cleaning screw conveyor are rotatable forward and backward.