GB2225253A - Cleaning of hopper-bottomed tanks - Google Patents

Cleaning of hopper-bottomed tanks Download PDF

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Publication number
GB2225253A
GB2225253A GB8823754A GB8823754A GB2225253A GB 2225253 A GB2225253 A GB 2225253A GB 8823754 A GB8823754 A GB 8823754A GB 8823754 A GB8823754 A GB 8823754A GB 2225253 A GB2225253 A GB 2225253A
Authority
GB
United Kingdom
Prior art keywords
tank
scrapers
hopper
tanks
corner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8823754A
Other versions
GB2225253B (en
GB8823754D0 (en
Inventor
William Brooke Midgley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB8823754A priority Critical patent/GB2225253B/en
Publication of GB8823754D0 publication Critical patent/GB8823754D0/en
Publication of GB2225253A publication Critical patent/GB2225253A/en
Application granted granted Critical
Publication of GB2225253B publication Critical patent/GB2225253B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
    • B08B9/0933—Removing sludge or the like from tank bottoms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/04—Settling tanks with single outlets for the separated liquid with moving scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/18—Construction of the scrapers or the driving mechanisms for settling tanks
    • B01D21/183—Construction of the scrapers or the driving mechanisms for settling tanks with multiple scraping mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/087—Cleaning containers, e.g. tanks by methods involving the use of tools, e.g. brushes, scrapers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Pusher Or Impeller Conveyors (AREA)

Abstract

A tank whose lower part is of pyramidal form, which may be used as a sewage settling tank, is cleaned by scrapers 4 located in the corners of the tank and connected by chains 5, the scrapers and chains being lowered together by cables 3 to scrape deposits from the vertical and inclined walls of the tank towards the bottom outlet. Cables may be manually or power-operated. <IMAGE>

Description

SCRAPER SYSTEM FOR HOPPER (PYRAMIDAL) BOTTOMED TANKS DESCRIPTION This invention relates to equipment for scraping deposits from the walls (vertical and sloping) of hopper bottomed (pyramidal) tanks used usually (but not exclusively) as settling tanks at Sewage Treatment Works.
Methods of scraping circular and rectangular tanks are well known, and, until the recent introduction of automatic desludging it has been assumed that pyramidal tanks did not require scraping because the angle of the sides was 'self-cleaning". This has proved not to be the case and this invention is intended to remove deposits from the scraped surfaces.
Treatment processes other than sewage treatment use hopper (pyramidal) bottomed tanks and this method cleaning may be applied to these processes (eg. paper production).
According to the present invention there are provided four corner scraper blades and a method of lowering and raising them to effect a scraping action to dislodge materials adhering to the surfaces. The corner scrapers may, if required, be linked together by a flexible member (eg. chain or similar device) to effect a scraping or dislodging action to materials adhering to the tank sides (vertical and/or sloping).
The lowering and raising system may be either hand operated or mechanically driven with or without automatic controls as desired.
A specific embodyment of the invention will now be described by way of example with reference to the accompanying drawing in which: Figure 1 is a section of a typical Hopper bottomed tank.
Figure 2 is a plan of a typical Hopper bottomed tank.
Referring to the drawing:- The tank (1) has in each corner and supported from the tank structure, a pulley (2) (or similar device) upon which runs a cable (3) (or similar support) to which is attached a corner scraper (4). Linking the corner scrapers is a chain (5) (or similar device) which may or may not be incorporated.
Its incorporation may be dependent upon the obstructions (pipes or valves) within the tank.
Scum boards (7), or similar obstructions, may determine the siting of the pulleys (2) and the number and arrangement of the pulleys.
The equipment (6) for raising and lowering is indicated schematically and may be hand operated or motorised. Motorised systems may, if required, include various safety devices to detect tight or slack cables. The position and number of the raising and lowering equipment (2) (6) may be dependent upon other equipment in the tanks and this may in turn effect the arrangement of pulleys (2).
By operating the equipment (6) the corner scrapers will be lowered towards the tank sump. The blades will be shaped to suit the angle of the tank corners and will dislodge material into the sump.
The chain will also dislodge material into the sump and will sag and remain in contact with the tank sides as the tank corners converge towards the sump. Raising the corner scrapers will also have a dislodging effect.
The periods between operating cycles will be determined to suit the particular treatment process and may be automatically controlled.

Claims (2)

  1. Claim 1.
    A system for scraping Hopper bottomed (pyramidal) tanks compris- ing four corner scrapers and equipment to raise and lower the four corner scrapers. The raising and lowering equipment may, or may not be motorised or automated, to suit the system requirements.
  2. Claim 2.
    A scraper system as claimed in Claim 1 with a chain or similar device linking the corners to effect scraping of the surfaces between the corners.
GB8823754A 1988-10-11 1988-10-11 Scraper system for hopper (pyramidal) bottomed tanks Expired - Lifetime GB2225253B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8823754A GB2225253B (en) 1988-10-11 1988-10-11 Scraper system for hopper (pyramidal) bottomed tanks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8823754A GB2225253B (en) 1988-10-11 1988-10-11 Scraper system for hopper (pyramidal) bottomed tanks

Publications (3)

Publication Number Publication Date
GB8823754D0 GB8823754D0 (en) 1988-11-16
GB2225253A true GB2225253A (en) 1990-05-30
GB2225253B GB2225253B (en) 1992-06-17

Family

ID=10644973

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8823754A Expired - Lifetime GB2225253B (en) 1988-10-11 1988-10-11 Scraper system for hopper (pyramidal) bottomed tanks

Country Status (1)

Country Link
GB (1) GB2225253B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2154122A1 (en) * 1997-02-28 2001-03-16 Gruppo Tecnoferrari Spa Equipment for cleaning silos.
WO2014079985A1 (en) * 2012-11-22 2014-05-30 Dieffenbacher GmbH Maschinen- und Anlagenbau Cleaning arrangement for free-fall shafts, more particularly for a device for gluing particles during production of material boards
ES2549539A1 (en) * 2015-08-11 2015-10-29 Jesús MORENO GONZALEZ System of cleaning and extraction of organic or inorganic matter precipitated in the stock deposits fund (Machine-translation by Google Translate, not legally binding)
CN107126757A (en) * 2017-06-29 2017-09-05 杨松松 It is a kind of to be used for the sewage precipitation device of environmental protection protection

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012111307A1 (en) * 2012-11-22 2014-05-22 Dieffenbacher GmbH Maschinen- und Anlagenbau Chute arrangement with a double cleaning device, in particular for a device for gluing particles in the course of the production of material plates

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2154122A1 (en) * 1997-02-28 2001-03-16 Gruppo Tecnoferrari Spa Equipment for cleaning silos.
WO2014079985A1 (en) * 2012-11-22 2014-05-30 Dieffenbacher GmbH Maschinen- und Anlagenbau Cleaning arrangement for free-fall shafts, more particularly for a device for gluing particles during production of material boards
ES2549539A1 (en) * 2015-08-11 2015-10-29 Jesús MORENO GONZALEZ System of cleaning and extraction of organic or inorganic matter precipitated in the stock deposits fund (Machine-translation by Google Translate, not legally binding)
CN107126757A (en) * 2017-06-29 2017-09-05 杨松松 It is a kind of to be used for the sewage precipitation device of environmental protection protection

Also Published As

Publication number Publication date
GB2225253B (en) 1992-06-17
GB8823754D0 (en) 1988-11-16

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20001011