US3687733A - Method for washing chips - Google Patents

Method for washing chips Download PDF

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Publication number
US3687733A
US3687733A US878172A US3687733DA US3687733A US 3687733 A US3687733 A US 3687733A US 878172 A US878172 A US 878172A US 3687733D A US3687733D A US 3687733DA US 3687733 A US3687733 A US 3687733A
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US
United States
Prior art keywords
chips
washing
tank
impurities
arrangement
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.)
Expired - Lifetime
Application number
US878172A
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English (en)
Inventor
John Lars Arvid Larsson
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.)
Metso Fiber Karlstad AB
Original Assignee
Karlstad Mekaniska Ab
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 Karlstad Mekaniska Ab filed Critical Karlstad Mekaniska Ab
Application granted granted Critical
Publication of US3687733A publication Critical patent/US3687733A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/023—Cleaning wood chips or other raw materials

Definitions

  • This invention relates to a method of continuously washing chips or the like so that stones, coarse sand and other particle impurities are removed from the chips, and it further relates to an arrangement for carrying out the method.
  • the chips In the conventional methods of conveying and storing wood chips, the chips in many cases are mixed to a great extent with impurities, such as stones, coarse sand and the like. If such foreign material is allowed to follow with the chips to their subsequent treatment by beating, screening etc., damages easily will be caused at the expensive apparatus equipment. If said impurities together with the chips enter the digesting process, the cooking liquor is contaminated and has to be exchanged at a higher rate. It is, therefore, desired to remove such particle impurities from the chips, for example by washing the chips with a liquid such as water or white liquor.
  • a liquid such as water or white liquor.
  • the invention has as its object to overcome the aforesaid impurity problems. This object is achieved in that the chips during their washing are caused to pass in a helical path, the lower part of which runs through a washing liquid.
  • FIG. I shows in a schematic way an arrangement according to the invention seen from one end wall
  • FIG. 2 shows the arrangement in FIG. 1 partially in section, seen from one long side
  • FIG. 3 shows the arrangement in FIG. 1 partially in section, seen from above
  • FIG. 4 is a view, partially in section, along the line 4-4 in FIG. 2,
  • FIG. 5 is a partial view, partially in section, along the line 5-5 in FIG. 3, and
  • FIG. 6 is a section along the line 6-6 in FIG. 5.
  • FIG. 1 shows in a schematic way how the chips to be washed enter the arrangement through an inlet opening 1 at the front end wall 2 of an external tank 3 containing a washing liquid, for example water or white liquor.
  • a washing liquid for example water or white liquor.
  • an internal cylinder comprising two hollow cylinder portions 4 and 5 whereof one portion 4 is secured on the tank 3.
  • the second portion 5 is a rotor mounted on a shaft 6 about which the rotor is caused to rotate by means of a motor (not shown).
  • Said rotor 5 is provided with a plurality of dog members 7 extending substantially between the tank front end wall 2 and a rear end wall 8 and, thus, also over the stationary cylinder portion 4, see FIG. 2.
  • the chips subsequent to their cleansing are conveyed along the rotor 5 in the direction of the arrows, see FIG. 3, by means of a reciprocating feeding attachment 10.
  • the rotor 5 is mounted on the shaft 6 by arms 11 with such inclination that they contribute in conveying the washed chips to the front end wall 2 and out of the chip washer through an outlet opening 12, see FIG. 4.
  • a conveyor screw or the like may be provided, particularly if it is desired to improve the continuity of the chip flow out of the chip washer.
  • the arrangement is disposed in connection to a conveyor chute 13 through which the chips to be washed fall.
  • Said conveyor chute 13 is provided with a damper means 14 rendering it possible to select the fraction size of the supplied chips to be washed.
  • the chip washer can operate at full capacity even when the chip supply temporarily is too great. In such a case, it is true, some part of the chips may enter the subsequent treatment steps in unwashed state, but for many applications this is not of any decisive importance.
  • Said damper means 14 also renders it possible to entirely separate the arrangement from the conveyor chute 13, so that maintenance work can be carried out without having to stop the chip fiow through the conveyor chute 13.
  • the impurities of a greater weight for example stones and gravel, are removed from the chips and sink to the bottom of the tank 3.
  • Said bottom is given the shape of a chute 15 with downward inclination toward an outlet 16 to a catching chamber 17 to which the impurities are directed from the tank 3.
  • Said impurity transport to the outlet 16 is effected to some extent by the bottom flows within the washing liquid, which flows have a main direction opposite to the translation mo tion of the chips. The effect of said flows is increased by a bafiie plate 18 as indicated in FIG. i.
  • the bottom of the catching chamber 17 has V-section, see FIG. 6, and within the chamber is mounted a vane means for the removal of the impurities.
  • Said vane means comprises a blade 19 which is mounted on a rotary shaft 20 by an arm 21 and designed so as to correspond to the V-section of the bottom in said catching chamber 17.
  • the blade 19 is provided with an oblique plate 22 forming an angle both with the plane of blade 19 and with the shaft 20.
  • the blade 19 collects impurities up from the lower portion of the 3 catching chamber 17 and, after the blade 19 has passed the horizontal position, the impurities on the blade 19 slide downwards along the oblique plate 22 whereafter they leave the catching chamber 17 through an opening 23 in one side of said chamber.
  • Method for continuously washing chips or the like with a liquid, such as water or white liquor, for removing stones, coarse sand and other particulate impurities from said chips comprising the steps of feeding the chips to be washed into a tank at a first end thereof, said tank containing a quantity of said liquid to a predetermined free level thereof; conveying said chips in an essentially circular motion about a rotor rotably mounted in said tank in such a fashion that a substantial portion of the chips are withdrawn from the water during each revolution of the rotor and so as to repeatedly move said chips into and out of said liquid; concurrently imparting a translational movement to said chips for conveying the latter toward a second end of said tank remote from said first end, said chips during said circular and translational movements through said tank passing in an essentially helical path the lower portion of which extends through said liquid and the upper portion of which extends above said liquid level; and removing said washed chips from said tank at said second end thereof.
  • a liquid such as water or white liquor

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
US878172A 1968-11-19 1969-11-19 Method for washing chips Expired - Lifetime US3687733A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE15693/68A SE327127B (enExample) 1968-11-19 1968-11-19

Publications (1)

Publication Number Publication Date
US3687733A true US3687733A (en) 1972-08-29

Family

ID=20301069

Family Applications (1)

Application Number Title Priority Date Filing Date
US878172A Expired - Lifetime US3687733A (en) 1968-11-19 1969-11-19 Method for washing chips

Country Status (9)

Country Link
US (1) US3687733A (enExample)
JP (1) JPS5224259B1 (enExample)
BR (1) BR6914317D0 (enExample)
CA (1) CA920541A (enExample)
DE (1) DE1958007B2 (enExample)
FI (1) FI49852C (enExample)
FR (1) FR2023615A1 (enExample)
NO (1) NO130775C (enExample)
SE (1) SE327127B (enExample)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1309543A (en) * 1919-07-08 Machine fob
DE121956C (enExample) *
DE85409C (enExample) *
US1799685A (en) * 1931-04-07 Emil gminder
DE299335C (enExample) * 1917-03-23
DE1215499B (de) * 1961-07-14 1966-04-28 Defibrator Ab Verfahren und Vorrichtung zum Reinigen von Holzhackschnitzeln, welche zur Herstellung von Zellstoff od. dgl. bestimmt sind
US3243039A (en) * 1962-05-14 1966-03-29 Harshberger Equipment Company Wood chip washer

Also Published As

Publication number Publication date
FI49852B (enExample) 1975-06-30
DE1958007B2 (de) 1982-12-02
JPS5224259B1 (enExample) 1977-06-30
NO130775B (enExample) 1974-10-28
BR6914317D0 (pt) 1973-02-01
FR2023615A1 (enExample) 1970-08-21
FI49852C (fi) 1975-10-10
NO130775C (enExample) 1975-02-05
CA920541A (en) 1973-02-06
SE327127B (enExample) 1970-08-10
DE1958007A1 (de) 1970-05-27

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