US3471015A - Vibrating screens - Google Patents

Vibrating screens Download PDF

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Publication number
US3471015A
US3471015A US677527A US3471015DA US3471015A US 3471015 A US3471015 A US 3471015A US 677527 A US677527 A US 677527A US 3471015D A US3471015D A US 3471015DA US 3471015 A US3471015 A US 3471015A
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US
United States
Prior art keywords
vibrating
screen
center
gravity
force
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
US677527A
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English (en)
Inventor
Jorma Aarne Kullervo Tuomaala
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.)
Ahlstrom Corp
Original Assignee
Ahlstrom Corp
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 Ahlstrom Corp filed Critical Ahlstrom Corp
Application granted granted Critical
Publication of US3471015A publication Critical patent/US3471015A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/34—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro perpendicularly or approximately perpendiculary to the plane of the screen
    • B07B1/343—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro perpendicularly or approximately perpendiculary to the plane of the screen with mechanical drive elements other than electromagnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
    • B06B1/16—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving rotary unbalanced masses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/18344—Unbalanced weights

Definitions

  • An improvement in vibrating screens in which the vibrating movement is brought forth by means of rotating masses which together with their. drive motor are directly attached to a screening apparatus supported by resilient elements and in which the center of gravity of the whole vibrating system and the application point of the vibrating force are situated at the same side of the center line of the vibrating screen, so disposed that the vibrating force is applied to a point which is situated at the opposite side of the center of gravity of the whole system 1 with respect to the center line of the screen and that the spring constant of the springs supporting the screening apparatus and the vibrating frequency are so selected with respect to each other that the vibration is overcritical.
  • This invention relates to an improvement in vibrating screens e.g. for fibre stock, and particularly to the so called flat screens, in which the vibrating movement is brought forth by means of rotating eccentric masses and the vibrating portion is supported by resilient elements.
  • a rotating shaft carries an unbalanced or eccentric weight, producing elliptical vibrations through centrifugal force as the weight rotates.
  • a pair of equal unbalanced weights in counter-rotation will automatically synchronize their motions to produce a resultant linear vibration. This occurs because the components of force attributable to each rotating weight cancel each other out except when the two weights are in conjunction, that is, when their angular positions coincide.
  • the points of conjunction are obviously on a line passing through the center of rotation. Vibrating devices based on this principle are conventional components in a wide range of commercial uses.
  • the vibrating unit thus formed has always been placed adjacent the screens "ice center of gravity and above the same, or in case several units have been employed they have been placed symmetrically with respect to the center of gravity, always however as near as possible to the center of gravity.
  • This arrangement has however the disadvantage that servicing and maintenance of the vibrating unit has become difficult since the screens can be of substantial dimensions and the vibrating unit has been situated substantially at the middle of the screen.
  • the object of the improvement according to the present invention is to provide power transmission from the drive motor to the vibrating shaft on which the eccentric mass is mounted without utilizing cardan' axles, elastic couplings of belt drives; and to make the servicing and maintenance of the vibrating unit easier by the fact that according to this invention the vibrating unit can be situated-nearer the rim of the vibrating unit and thus is more accessible.
  • reference numeral 1 indicates a drive motor
  • 2 refers to a vibrating device having the usual counter-rotatory eccentric masses conventionally arranged to'produce linear vibratory movement, firmly attached to a screen plate 3.
  • the drive motor 1 is directly coupled to the vibrating device 2 whereby it will be situated near the outer wall of the screen plate 3, by virtue of which
  • the spring forces are reprensented by q, the center of gravity by G, the vibratory force by F and the distance of the application point of the vibration force from the center of gravity by a, and the distance of the resultant of the spring forces Eq from the center of gravity by b.
  • the object of the invention is to fixedly mount the motor and vibrating assembly on the screen so that the center of gravity of the thus formed vibrating system and the application point of the vibrating force will be situated at the same side of the center line of the screen, and that the application point of the vibrating force will be situated outside the center of gravity.
  • the spring fac- "tors of the springs supporting the whole system and the vibration frequency of the entire system are selected so with respect to each other, that the vibration will be overcritical, which means that the spring force q and the vibrating force F will be in the same phase or in other words act in the same direction. This is achieved with the equilibrium condition:
  • an arrangement for producing overcritical vibration comprising a screen supported for linear vibratory movement by springs secured to the screen, a vibrating mechanism including a motor and rotatable eccentric masses coupled to the motor for rotation by the motor, said vibrating mechanism being directly attached to the screen and supported by said springs to vibrate with the screen and to comprise therewith a vibratory system having its center of gravity remote from a center line of the screen, the vibrating mechanism being adapted to apply vibratory force at a point spaced from said center of gravity and on the opposite side of the center of gravity from said center line, and the eccentric masses being adapted to rotate at a speed higher than the natural vibration frequency of the vibratory system.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
US677527A 1966-10-25 1967-10-24 Vibrating screens Expired - Lifetime US3471015A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI662814A FI46276C (fi) 1966-10-25 1966-10-25 Sovitelma täryseuloissa.

Publications (1)

Publication Number Publication Date
US3471015A true US3471015A (en) 1969-10-07

Family

ID=8507621

Family Applications (1)

Application Number Title Priority Date Filing Date
US677527A Expired - Lifetime US3471015A (en) 1966-10-25 1967-10-24 Vibrating screens

Country Status (5)

Country Link
US (1) US3471015A (show.php)
DE (1) DE1300811B (show.php)
FI (1) FI46276C (show.php)
GB (1) GB1194369A (show.php)
SE (1) SE336953B (show.php)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112547499A (zh) * 2020-12-14 2021-03-26 山东米科思机械设备有限公司 一种侧装电机的同步筛分机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB299902A (en) * 1927-08-02 1928-11-02 Norman Stewart Hindley Improvements in or relating to screens for sifting purposes
US1726192A (en) * 1924-01-10 1929-08-27 Rodney G Richardson Vibrating device
US2415993A (en) * 1945-03-07 1947-02-18 Cottrell William Percival Gyratory screen, rubber munted spring support
US2854594A (en) * 1955-04-12 1958-09-30 Syntron Co Rotary vibratory motor
US3014587A (en) * 1959-08-24 1961-12-26 Syntron Co Vibratory screen with single unbalanced vibratory motor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512120A (en) * 1950-06-20 Vibrating apparatus
DE1139441B (de) * 1959-12-28 1962-11-15 Maschf Augsburg Nuernberg Ag Sieb zum Ausscheiden von festen Fremdkoerpern aus schlammigen Schuettguetern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1726192A (en) * 1924-01-10 1929-08-27 Rodney G Richardson Vibrating device
GB299902A (en) * 1927-08-02 1928-11-02 Norman Stewart Hindley Improvements in or relating to screens for sifting purposes
US2415993A (en) * 1945-03-07 1947-02-18 Cottrell William Percival Gyratory screen, rubber munted spring support
US2854594A (en) * 1955-04-12 1958-09-30 Syntron Co Rotary vibratory motor
US3014587A (en) * 1959-08-24 1961-12-26 Syntron Co Vibratory screen with single unbalanced vibratory motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112547499A (zh) * 2020-12-14 2021-03-26 山东米科思机械设备有限公司 一种侧装电机的同步筛分机

Also Published As

Publication number Publication date
FI46276B (show.php) 1972-10-31
SE336953B (show.php) 1971-07-19
DE1300811B (de) 1969-08-07
GB1194369A (en) 1970-06-10
FI46276C (fi) 1973-02-12

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