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WO1992005881A1 - Tamis a barreaux a mouvement alternatif - Google Patents

Tamis a barreaux a mouvement alternatif Download PDF

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Publication number
WO1992005881A1
WO1992005881A1 PCT/US1991/007210 US9107210W WO9205881A1 WO 1992005881 A1 WO1992005881 A1 WO 1992005881A1 US 9107210 W US9107210 W US 9107210W WO 9205881 A1 WO9205881 A1 WO 9205881A1
Authority
WO
WIPO (PCT)
Prior art keywords
bars
screen
bar
chips
outfeed
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.)
Ceased
Application number
PCT/US1991/007210
Other languages
English (en)
Inventor
Gevan R. Marrs
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.)
Weyerhaeuser Co
Original Assignee
Weyerhaeuser Co
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 Weyerhaeuser Co filed Critical Weyerhaeuser Co
Priority to AU87632/91A priority Critical patent/AU8763291A/en
Publication of WO1992005881A1 publication Critical patent/WO1992005881A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/12—Apparatus having only parallel elements
    • B07B1/16—Apparatus having only parallel elements the elements being movable and in other than roller form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/12—Apparatus having only parallel elements
    • 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 generally to the particle sizing art, such as for wood chips, and more specifically concerns a bar screen type particle sizing apparatus.
  • the gyratory screen typically comprises a flat plate or sheet having holes of a selected size and dimension punched therein, while the disc screen comprises a plurality of closely spaced thin discs vertically mounted on successive horizonal rods. Each row of discs is interleaved to an extent with the discs from adjacent rows. The relative spacing of the discs in a single row and the spacing between successive rows of discs are selected relative to the sizing function being accomplished, i.e. the desired dimensions of the particles.
  • the gyratory screen can be readily and inexpensively replaced or altered to change the screen surface openings after installation
  • disc screens are very difficult and expensive to alter once installed.
  • a change in the size of the disc screen openings basically requires replacement of the entire screen, which as mentioned above, is quite expensive.
  • the disc screen elements will physically wear over time and will require replacement, which is expensive.
  • Bar screens typically comprise a plurality of longitudinal bars which are spaced apart a selected distance, depending upon the size of the particles to be processed. In certain applications, including chip sizing, it is known that relative movement of the bars is important for proper operation of bar screens, especially to avoid plugging, and further that the bar movement be such that alternate bars are always at different points in their individual cycles of movement so that there is always a relative difference in position of adjacent bars. Examples of bar screens having these capabilities are shown in U.S. Patent No. 4,660,726 to Woode and Swedish Patent No. 88,615 to Granquist.
  • bar screens in general have significant plugging problems, i.e. the chips or other particles being processed by the screen become caught between the bars, preventing acceptable chops from falling through.
  • bar screens are not widely used for particle sizing, including sizing of wood chips.
  • Bar screens are also typically characterized by an inability to tip up the particles being processed on edge so that sizing may be accomplished on the basis of thickness. Since thickness is currently a very significant parameter in sizing wood chips, bar screens are not typically used in new wood chip sizing installations.
  • the present invention is a bar screen which is adapted to separate wood chips and the like in accordance with preselected dimensional criteria, comprising a plurality of elongated bars which are connected together so as to define a screening member, wherein the screening member has an infeed portion and an opposing outfeed portion and wherein the screening member is arranged and supported such that said screening member inclines downwardly from the infeed portion to the outfeed portion.
  • the apparatus further includes means for moving the elongated bars both longitudinally and vertically, wherein the movement of the elongated bars tends to inhibit the flow of wood chips from moving from the infeed to the outfeed to the screening member.
  • Figure 1 is a schematic view of a particle (wood chip) sizing apparatus incorporating the principles of the present invention.
  • Figure 2 is a schematic view showing an end portion of several bars in the bar screen of Figure 1 and the means for supporting and moving the bars.
  • Figures 3A-3D are side elevational views showing the relative movement at various points in time of the end portions of two adjacent bars in the bar screen of Figure 1.
  • Figure 1 shows the particle bar screen of the present invention, arranged to separate a wood chip flow into those chips which are within an acceptable pre-established size range and those chips where are oversize in the thickness dimension, i.e. over-thick.
  • the bar screen is shown generally at 10 and comprises a plurality, i.e. 25-30, of parallel rigid metal bars 12-12.
  • the details of the geometry of the bar screen 10 and the bars 12, i.e. length, width, thickness, number, material and relative spacing will vary significantly from apparatus to apparatus. A preferred embodiment is disclosed in detail hereinafter.
  • each bar 12 has a cam element 18 ( Figure 2) positioned in each end thereof.
  • a camshaft 20 extends through an opening 21 in each cam element, thereby connecting the bars 12-12 together at their forward ends.
  • a similar rear camshaft 20a connects the rear ends of the bars 12 in similar fashion.
  • the opening 21 in the respective cam elements 18-18 is offset from the center of the cam element and is configured to receive the camshaft 20, which is square in cross section, so that rotation of the camshaft 20 will result in movement of the bars 12-12.
  • the arrangement of the camshaft 20, the cam element 18 and the bars 12 is such that each point on the bar will move in a circle approximately one inch in diameter.
  • the upper front corner of bar 12 will move vertically a total of one inch and horizontally a total of one inch during one complete revolution of camshaft 20.
  • the individual bars 12-12 are separated by spacers 22-22, with the camshaft 20 extending through an opening 23 in the spacers 22-22.
  • the details of the cam elements 18, shaft 20, and spacers 22 are discussed hereinafter.
  • a drive motor 24 is connected to the camshaft 20.
  • the free end of camshaft 20, which is relatively away from the drive motor 24, includes a sprocket 26.
  • the rear camshaft 20a also includes a sprocket 28 on one end thereof, on the same side of the bar screen 10 as sprocket 26, so that sprockets 26 and 28 are in the same plane.
  • Sprockets 26 and 28 are connected by a chain 30 so that when camshaft 20 is driven by drive motor 24, the rear camshaft 20a is driven as well.
  • the bar screen 10 is supported on a base assembly shown generally at 32 which is open at its top, where the bar screen 10 is located.
  • a conventional feed conveyor 34 moves particles to be sorted onto a downwardly inclined feed tray 36, which connects the feed conveyor 34 to the rear end 16 of the bar screen 10.
  • an outlet tray 38 which guides the chips remaining on top of the bar screen 10 during operation thereof, when they reach the forward end 14 of the bar screen 10, to an over-thick conveyor 40.
  • the conveyor 40 moves the over-thick chips to a slicer or other device (not shown) for reducing the size of the chips or to some other destination.
  • bar screen 10 is supported so that it is flat in the embodiment shown.
  • the bar screen 10 could be inclined downwardly, which would assist in the conveying, i.e. movement, of the chips from the rear end to the forward end of the bar screen 10, or the bar screen 10 could be inclined in the other direction, i.e. upwardly, in the particular application.
  • the precise amount of the incline can be selected for a particular application.
  • each bar 12 includes a cam element 18 near the front end thereof.
  • the cams 18 are circular and fit into a mating cutout portion 43 in a bar 12.
  • the bars 12-12 are rectangular and relatively thin, approximately 1/4 inch thick.
  • the thickness of the bars 12-12 is the minimum thickness which will result in an acceptable amount of deflection at the midspan point of the bars.
  • the thickness dimension of the bars remains constant from the top edge 42 of the bar to the bottom 44 thereof.
  • cross-sectional shape This appears to be the most effective cross-sectional shape, since it is easy to manufacture and inexpensive to replace.
  • Other cross-sectional shapes could be used, including elliptical, or round, or the bars could be inversely wedge-shaped with the large dimension at the top, or still further, the upper portion of the bar could be peaked so as to tip up the chips more effectively.
  • the top surface 42 of each bar is smooth and flat. However, it could be roughened to some extent, or knurled or even have teeth of a selected size, to assist in the movement and agitation of the material being screened.
  • the teeth could be relatively small, i.e. one-quarter inch, up to tow inches high or more.
  • the side surfaces 52 of the each bar 12 may also have some contour or be abraded to some extent.
  • the sides of adjacent bars are parallel, such that successive slots, defined by adjacent bars, have the same width from top to bottom.
  • the slots may also have other shapes, including a configuration in which the space between bars increases from top to bottom, which could be accomplished by using tapered bars.
  • camshaft 20 extends through each one of the cams 18 positioned in the bars 12.
  • the camshaft 20 is square in cross-section, but could also have other shapes.
  • the cam 18 is positioned midway between the top and bottom edges of each bar 12.
  • the camshaft is offset from the center line of the bar so as to give the amount of bar movement desired.
  • spacers 22 Positioned between the successive bars are spacers 22 which in the embodiment shown are circular, having a diameter slightly greater than the width of bars 12-12 and approximately the same thickness.
  • the thickness of the spacer is independent of the thickness of the bar and is typically chosen to produce a slot width which will produce the desired particle separation.
  • the slot width is slightly smaller than the desired particle size, i.e.
  • the camshaft 20 extends through a matching hole 23 in each spacer 22.
  • the cams and spacers comprise a low-friction, high wear plastic material, such as DELRIN, but could also alternatively comprise sealed roller bearings or other low friction materials or elements.
  • the spacers shown have the advantage of being easy and inexpensive to disassemble in the field to replace worn bars and/or change spacer size so as to change the screen slot width and hence particle separation.
  • the position of the cams 18 and in particular the openings 21 therein in the bars 12 determine the magnitude of movement of individual bars relative to the camshaft 20.
  • the relative positioning of the cams 18 in successive bars determines the movement of the bars relative to each other.
  • the bars from the two sets are arranged in alternating succession.
  • the cams 18 in one set of bars are at their highest position, so that the bars of that set are all high, while the cams in the other set (alternating with first set) are all low so that the bars of the other set are all low.
  • Figure 2 While the embodiment shown comprises two sets of alternating bars at 180°, the screen 10 could comprise 3 or even more sets of alternating bars, although the sets should be balanced relative to each other (3 sets at 120°, 4 sets at 90°, etc.), so as to minimize vibration and wear on bearing surfaces.
  • Figures 3A-3D show the concept of relative movement of the two sets of bars of the present embodiment in a more detailed matter.
  • a first bar 66 is shown with its cam 68, as well as a second adjacent bar 70 with its cam 72.
  • a spacer 74 separates the 2 bars 66 and 70.
  • Camshaft 76 extends through cams 68 and 72 and the spacer 74.
  • Camshaft 76 is fixed in position, other than rotating counter-clockwise. Hence, movement of the two bars 66, 70 is about the camshaft 76.
  • Figure 3A shows camshaft 76 at a first rotational position, in which the first bar 66 is in a relatively forward and relatively high position while bar 70 is in a relatively low and rear position.
  • the two bars are exactly 180° out of phase, because the cams are positioned in the bars such that the respective openings therein are 180° apart.
  • Figure 3B shows the relative position of the two bars 66 and 70 following movement of the camshaft 76 90° in a counter-clockwise direction.
  • the first bar 66 is in a still relatively forward but now relatively low position in its path of movement while bar 70 is still relatively to the rear but also now relatively high.
  • Figure 3C shows the relative position of the two bars 66 and 70 when the camshaft 76 has moved another 90° counter-clockwise. In this position of the camshaft, the first bar 66 is now relatively to the rear and still relatively low, while the bar 70 has now moved to a forward position and is still relatively high.
  • Figure 3D shows the relative position of the bars 66 and 70 upon further rotation of the camshaft another 90°. In this position, the first bar 66 is still relatively to the rear but is now relatively high, while bar 70 is still relatively forward but now is relatively low as well. Another 90° rotation of the camshaft will bring the two bars 66, 70 back to the position of Figure 3A.
  • bar movements patterns could be used, including non-alternating sets, such as two consecutive bars up, to consecutive bars down, or other patterns.
  • non-alternating sets such as two consecutive bars up, to consecutive bars down, or other patterns.
  • the motion of the bars 12 is such that both ends of the bars 12 are always in the same relative vertical position, i.e. the respective ends of each bar always move in tandem, i.e. unison, as opposed to the relative position of the bar ends changing on a regular basis.
  • Patterns of bar motion can be produced in which the incline or slope of the bar will vary on a cyclical basis.
  • different types of bar drive devices could be utilized such that the ends of the bar will follow a different path than the circular path of the embodiment shown.
  • the two sets of bars could be supported on two separate frames, with the frames then driven by separate cams.
  • a single cam could also be used with a connecting arm to the frame.
  • the inventors have discovered that both the relative movement of the bars and the speed of the bars are important to achieve effective screening action, keep the screen clear and prevent plugging. Movement of the bars alone is not sufficient to prevent plugging.
  • the speed of the bars as well as the horizontal and vertical movement of the bars are such in combination that sufficient acceleration is imparted to the wood chips lying on top of the screen that the chips move about on the bar screen and encounter a slot between two adjacent bars.
  • the acceleration will be approximately 1G (32 feet per second per second) or slightly greater, such that the chips will just break contact with the bars at some point (overcome gravity) and will tend to become vertically oriented as they encounter a slot.
  • a camshaft speed of 228 RPM is sufficient to achieve the desired results by imparting sufficient acceleration to the wood chips that the chips move about on the bar screen, the chips tending to be tipped up on edge and fall between adjacent bars, thereby encountering a slot in the screen. It is the combination of both vertical and horizontal motion of the bars and sufficient speed thereof which has been found to be effective.
  • the first variable is the inclination of the screen.
  • the inclination may be zero, i.e. the screen is flat, or the screen may be inclined either downwardly from the infeed end to the outfeed end, or vice versa, upwardly from the infeed end to the outfeed end.
  • conveying of the input material is promoted, while when the screen is inclined upwardly, conveying of the input material is inhibited.
  • the amount of the inclination of course will directly affect the extent to which the material is either promoted or inhibited.
  • the second variable is the rotational direction of the individual bars.
  • Rotating the bars in a direction corresponding to the flow of material e.g. from the infeed end to the outfeed end, such as described in the above embodiment, will tend to promote the conveying of material from the infeed end toward the outfeed end, while rotating the bars in the opposing direction will tend to inhibit the conveying of material toward the outfeed end.
  • the speed of rotation will affect the extent of the promotion/inhibition of the conveying of the input material.
  • the flow of the input chip mass itself will have a significant effect on the conveying of the input material.
  • the screen 10 is inclined downwardly from the infeed end to the outfeed end. The slope of the screen in this particular embodiment is fairly steep, approximately 15°, but this could be altered to an extend, within the general range of 5° to 30°.
  • the bars 12 are rotated in a reverse direction, i.e. against the flow of input material, and opposite to that described above.
  • the directional arrows of Figures 3A-3D are reversed from that shown.
  • Such an embodiment thus combines a screen inclination which tends to promote the conveying of the input material from the infeed end of the screen to the outfeed end and a screen bar rotation direction which tends to inhibit the conveying of the input material.
  • the speed of rotation of the bars is approximately 220 revolutions per minute. This could be varied, within a range of 150 to 450 revolutions per minute, depending upon the amount of loading, the characteristics of the input material and the particular inclination of the bar screen.
  • the loading of the bar screen may be varied depending upon the type of input material used, as well as other characteristics of the system. With respect to all three variables discussed above, good results have been obtained with an input of wood chips having approximately 12% over-thick chips greater than 8 mm, with a loading of 0.15-0.22 units per hour per square foot of screen area, when the inclination of the bar screen is downward at 15° and the bars are rotated in a reverse direction at 220 rpm. Such a system provides a good retention time of wood chip mass on the screen, and produces a very high percentage removal of chips within the acceptable size range (85%-95%).
  • the significant advantage of this embodiment is a performance level which approaches or even surpasses that of a conventional disc screen, while providing significant improvements relative to the disc screen in terms of overall cost and maintenance.
  • the bar screen of the present invention is inexpensive to manufacture and maintain, particularly compared to convention disc screens, and further more is very efficient when compared to either a disc screen or gyratory screen alone, but also the combination of a gyratory screen and a disc screen. Over-thick removal efficiencies of approximately 95% have been obtained.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

Tamis à barreaux (10) servant à trier en fonction de la taille des copeaux de bois et qui comprend une multiplicité de barreaux parallèles (12-12) soutenus à leurs extrémités respectives (14, 16) et entraînés d'une telle manière que chaque barreau se déplace à la fois longitudinalement et verticalement. Deux ensembles alternés de barreaux sont compris, un ensemble étant éloigné de 180° par rapport à l'autre ensemble. Chaque ensemble de barreaux alterne entre des positions verticales relativement hautes et basses. Lorsque chaque ensemble se trouve dans sa position relativement haute, les barreaux se déplacent longitudinalement vers l'extrémité d'alimentation du tamis à barreaux (10). Le tamis à barreaux (10) est incliné vers le bas, de l'extrémité d'alimentation à l'extrémité de sortie, à un angle de 15° environ.
PCT/US1991/007210 1990-10-03 1991-10-01 Tamis a barreaux a mouvement alternatif Ceased WO1992005881A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU87632/91A AU8763291A (en) 1990-10-03 1991-10-01 Bar screen having a reciprocating action

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US59222990A 1990-10-03 1990-10-03
US592,229 1990-10-03

Publications (1)

Publication Number Publication Date
WO1992005881A1 true WO1992005881A1 (fr) 1992-04-16

Family

ID=24369850

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/007210 Ceased WO1992005881A1 (fr) 1990-10-03 1991-10-01 Tamis a barreaux a mouvement alternatif

Country Status (2)

Country Link
CA (1) CA2093342A1 (fr)
WO (1) WO1992005881A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994002261A1 (fr) * 1992-07-21 1994-02-03 Weyerhaeuser Company Crible a barreaux sous tension
CN114247638A (zh) * 2021-12-21 2022-03-29 江苏徐工工程机械研究院有限公司 筛分机

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1606301A (en) * 1923-09-07 1926-11-09 Inland Engineering Company Screening and feeding apparatus
US3217346A (en) * 1964-07-15 1965-11-16 Ogden Iron Works Co Roll screen for cleaning root crops
US3254767A (en) * 1961-04-12 1966-06-07 Wehner Albert Relatively movable bar screen with cleaners
US3971716A (en) * 1974-11-27 1976-07-27 Foreman Kenneth C Rock separator
US4376042A (en) * 1981-05-11 1983-03-08 Weyerhaeuser Company Chip sizing process
SU1058639A1 (ru) * 1982-04-15 1983-12-07 Калининский Ордена Трудового Красного Знамени Политехнический Институт Устройство дл сепарации сыпучего материала
US4660726A (en) * 1983-06-15 1987-04-28 Rudolf Woode Bar screen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1606301A (en) * 1923-09-07 1926-11-09 Inland Engineering Company Screening and feeding apparatus
US3254767A (en) * 1961-04-12 1966-06-07 Wehner Albert Relatively movable bar screen with cleaners
US3217346A (en) * 1964-07-15 1965-11-16 Ogden Iron Works Co Roll screen for cleaning root crops
US3971716A (en) * 1974-11-27 1976-07-27 Foreman Kenneth C Rock separator
US4376042A (en) * 1981-05-11 1983-03-08 Weyerhaeuser Company Chip sizing process
SU1058639A1 (ru) * 1982-04-15 1983-12-07 Калининский Ордена Трудового Красного Знамени Политехнический Институт Устройство дл сепарации сыпучего материала
US4660726A (en) * 1983-06-15 1987-04-28 Rudolf Woode Bar screen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED Section PQ, Week 8432, 19 September 1984 Derwent Publications Ltd., London, GB; Class P43, AN 84-199752/32 & SU,A,1 058 639 (KALININ POLY) 7 December 1983 see abstract *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994002261A1 (fr) * 1992-07-21 1994-02-03 Weyerhaeuser Company Crible a barreaux sous tension
CN114247638A (zh) * 2021-12-21 2022-03-29 江苏徐工工程机械研究院有限公司 筛分机

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