EP3842158A1 - Vibrating screen, especially with slotted sieve, and method for controlling the operation of the screen, especially with slotted sieve - Google Patents

Vibrating screen, especially with slotted sieve, and method for controlling the operation of the screen, especially with slotted sieve Download PDF

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Publication number
EP3842158A1
EP3842158A1 EP20214707.0A EP20214707A EP3842158A1 EP 3842158 A1 EP3842158 A1 EP 3842158A1 EP 20214707 A EP20214707 A EP 20214707A EP 3842158 A1 EP3842158 A1 EP 3842158A1
Authority
EP
European Patent Office
Prior art keywords
screen
plane
vibrators
centre
sieve
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.)
Withdrawn
Application number
EP20214707.0A
Other languages
German (de)
English (en)
French (fr)
Inventor
Piotr Czubak
Robert Klisowski
Tomasz Gawenda
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.)
Akademia Gomiczo Hutnicza
Original Assignee
Akademia Gomiczo Hutnicza
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 Akademia Gomiczo Hutnicza filed Critical Akademia Gomiczo Hutnicza
Publication of EP3842158A1 publication Critical patent/EP3842158A1/en
Withdrawn legal-status Critical Current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
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • 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
    • B07B1/282—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens their jigging movement being a closed or open curvilinear path in a plane perpendicular to the plane of the screen and parrallel or transverse to the direction of conveyance
    • 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

Definitions

  • the subject matter of the invention is a vibrating screen, especially with a slotted sieve, and a method for controlling the operation of the screen, especially with a slotted sieve, applicable, inter alia, in the mining, metallurgical and cement and lime industry, in the processing of mineral resources and waste, and especially in the production of high-quality refined mineral aggregates, for sieving regular grains from irregular grains.
  • a screen is known from Polish patent description PL160340B1 , which is characterized in that extreme vibrators are arranged in a jointed manner on two opposite walls of the riddle, the walls being parallel to each other and perpendicular to the plane of the sieve, in such a way that the lines of action of exciting forces intersect in the centre of gravity of the riddle or are vibrated relative to its axis.
  • a central vibrator is arranged above or below the riddle, in the axis of the riddle.
  • the shafts of the extreme vibrators rotate at the same speed and can operate concurrently and counter-currently, being synchronized.
  • the extreme vibrators are switched on simultaneously and then a central vibrator is switched on. The synchronization thus obtained makes the extreme vibrators cause the screen to circulate in a horizontal plane, while the central vibrator causes it to circulate in a vertical plane.
  • Polish patent description PL167019B1 a vibrating screen is known, flexibly suspended from a support suspension and equipped with a cuboidal riddle with stretched sieves and drive vibrators.
  • the screen is characterized in that two vibrators, called side vibrators, are attached to the front and rear wall of the riddle, each vibrator having a different exciting force and a different rotational speed and operating on the basis of self-synchronization.
  • the side vibrators induce a flat vibrating movement which takes place in a vertical plane, the plane perpendicular to the surface of the sieve, and is generated longitudinally relative to the riddle.
  • the screen can also be equipped with one side vibrator, attached to the front wall of the riddle and inducing a flat non-linear movement.
  • the screen is equipped with two identical rotary vibrators arranged on a basis such that their transverse axes of symmetry, perpendicular to the axes of rotation of the vibrators attached to the front and rear wall of the riddle, pass through the centre of gravity of the entire riddle.
  • These vibrators force vibrations in a plane perpendicular to the previous vibration plane and intersecting at an acute angle with the sieve plane.
  • the operation of the screen is as follows.
  • the side vibrators are actuated simultaneously, which causes their dynamic synchronization.
  • the directions of rotation of these vibrators may be the same or opposite, which causes different trajectories of the vibrating sieve.
  • the rotary vibrators which can rotate in the same or opposite directions, are then activated.
  • the screen disclosed in US Patent US6513664B1 is also able to operate using elliptical vibrations.
  • the screen has three inertial vibrators.
  • Two counter-rotating vibrators are arranged symmetrically on a transverse beam connecting the sides of the riddle in such a way that their axes of rotation are parallel to the plane of symmetry of the screen, with the centre of gravity of the screen lying in said plane, and the direction of action of the resultant exciting force, in the operation mode with synchronized vibrators, passes through the centre of gravity of the screen obliquely to the sieve deck.
  • the third vibrator is arranged on a transverse beam such that its axis of rotation is perpendicular to the plane of symmetry of the screen and the resultant force acts in that plane.
  • Each vibrator is made up of unbalanced masses mounted on two ends of the shaft, driven by the rotor of an electric motor.
  • Each electric motor is connected to a regulator of rotational speed.
  • the sieve of the screen is mounted on the riddle, the riddle supported by means of flexible supports on a non-deformable foundation.
  • the operation of the screen can be controlled by means of a controller which runs an implemented program, the program making it possible to select one of two operation modes of the screen: a linear vibration mode, with two counter-rotating vibrators being actuated, or an elliptical vibration mode in the plane of symmetry of the screen, by switching on the third vibrator.
  • Elliptical vibrations are forced in a similar way by the screen described in Chinese patent description CN101690931B .
  • the objective of the invention is to develop a screen and a method for controlling its operation such that the screen, in addition to providing an optimal grain toss indicator, can also cause a change in the nature of grain movement, by giving the grains a variable trajectory and causing them to rotate in two axes. This increases the likelihood that flat grains, especially the larger ones, will be tossed and, as a result of rotation, will fall with their minimum projection area into the sieve slots, leading to a greater grain separation efficiency.
  • the optimum toss indicator will enable difficult grains wedged in the meshes (slots) of the sieves to unwedge and to be transported to the oversize of the screen.
  • the screen comprises a riddle, the riddle arranged by means of flexible supports on a rigid base and with at least one sieve deck arranged in the riddle, with two inertial counter-rotating vibrators suspended to the sieve deck and arranged symmetrically, in such a way that the axes of rotation of the vibrators are parallel to the plane of symmetry of the screen, with the centre of gravity of the screen lying in said plane, and the direction of action of the resultant exciting force, in the operation mode with synchronized vibrators, passes through the centre of gravity of the screen obliquely to the sieve deck, and in addition, the vibrators are connected, via known means of drive transmission, to electric motors equipped with regulators of rotational speed, being inverters.
  • the essence of the vibrating screen, especially with a slotted sieve, is that the inverters additionally have a system for controlling the phase angle of vibrator orientation, so that in the operation mode with the phase angle other than zero, exciting force W, being the resultant force from the forces of action of the vibrators, acts in a plane defined by two central axes: a central axis perpendicular to the plane of symmetry of the screen and a central axis inclined obliquely to the sieve deck, with the direction of the latter being defined by the centre of gravity of the screen and a point lying in the plane of symmetry of the sieve, the point being the centre of the section connecting the axes of the vibrators.
  • the vibrators are suspended from the screen in such a way that the oblique inclination of the central axis to the sieve deck is in the range from 30° to 45°. It is also preferred that the spacing between the flexible supports is symmetrical relative to the centre of gravity of the screen and does not exceed 0.6 of the length of the screen. It is further preferred that the distance from the point, which is the centre of the section connecting the axes of the vibrators, to the centre of gravity of the screen is greater than 0.25 of the length of the screen.
  • the essence of the method for controlling the operation of the screen, especially with a slotted sieve, realized in such a way that the amplitude and speed of screen vibrations acting in its plane of symmetry are adjusted by changing the rotational speed of the vibrators, is that by controlling the phase angle of vibrator orientation, the direction of action of the resultant force is changed such that said force does not run in the plane of symmetry of the screen and as a result, angular vibrations of the screen are induced in the plane defined by the central axis perpendicular to the plane of symmetry of the screen and by the central axis inclined obliquely to the sieve deck, the direction of the latter being defined by: the centre of gravity of the screen and a point lying in the plane of symmetry of the screen, the point being the centre of the section connecting the axes of the vibrators.
  • Fig. 1 shows a general view of the screen in perspective
  • Fig. 2 shows a simplified view of a physical model of the screen in the plane of symmetry ⁇
  • Fig. 3 shows a fragment of sectional view (A-A) of the screen, parallel to the plane of action of the exciting forces, for an instantaneous position of the vibrators.
  • the screen ( Fig. 1 , Fig. 2 ) has a riddle 1, in which the deck of the slotted sieve 2 is arranged.
  • the riddle 1 is arranged by means of a flexible support 3 on a rigid base.
  • the spacing between the supports is 0.6 of the length of the screen and is arranged symmetrically relative to centre of gravity C of the screen.
  • Two counter-rotating inertial vibrators 4 are arranged, in an upper arrangement, on the common beam connecting the sides of the riddle, the vibrators driven by electric motors equipped with regulators 5 of rotational speed, which are inverters equipped with a system for controlling the phase angle ⁇ of vibrator 4 orientation.
  • the vibrators 4 are arranged symmetrically, in such a way that their rotational axes are parallel to each other and are parallel to the plane of symmetry ⁇ of the screen, with centre of gravity C of the screen lying in said plane.
  • Central axis z c and central axis x c define the plane in which exciting force W acts, which is the resultant force from the forces F of action of the vibrators 4 ( Fig. 3 ).
  • the distance from point J to centre of gravity C of the screen is 0.25 of the length of the screen.
  • the method for controlling the operation of the screen is that in order to adjust the speed with which the material being screened is transported along the sieve 2 deck, the forcing frequency is controlled by changing the rotational speed of the vibrators.
  • resultant exciting force W being variable in terms of value
  • the direction of action of resultant exciting force W does not pass through centre of gravity C of the screen, but passes beside it, acting in plane z c x c , along axis ⁇ of a variable direction.
  • angular vibrations ⁇ of the screen in plane z c x c are induced, aimed at tossing and rotating the grains. This increases the likelihood of them falling into the slots of the sieve 2 with their minimum projection area and effective sieving (separating) of flat or elongated (irregular) grains from regular (cubic) grains.
  • the screen operation parameters are adjusted by controlling the forcing frequency and phase angle ⁇ of vibrator 5 orientation.
  • the angle ⁇ of inclination of central axis z c the component of the screen vibrations is increased, said vibrations causing a change in the trajectory of grain movement, at the expense of the component of vibrations causing grain transport along the sieve deck.
  • the solution being the subject matter of the invention makes it possible to force axial vibrations in the plane of symmetry ⁇ of the screen and angular vibrations ⁇ of the vibrator in a plane perpendicular to the plane of symmetry ⁇ of the screen, without the need to install on it additional devices to force vibrations.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Jigging Conveyors (AREA)
EP20214707.0A 2019-12-23 2020-12-16 Vibrating screen, especially with slotted sieve, and method for controlling the operation of the screen, especially with slotted sieve Withdrawn EP3842158A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL432369A PL241072B1 (pl) 2019-12-23 2019-12-23 Przesiewacz wibracyjny, zwłaszcza z sitem szczelinowym oraz sposób sterowania pracą przesiewacza, zwłaszcza z sitem szczelinowym

Publications (1)

Publication Number Publication Date
EP3842158A1 true EP3842158A1 (en) 2021-06-30

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EP20214707.0A Withdrawn EP3842158A1 (en) 2019-12-23 2020-12-16 Vibrating screen, especially with slotted sieve, and method for controlling the operation of the screen, especially with slotted sieve

Country Status (2)

Country Link
EP (1) EP3842158A1 (pl)
PL (1) PL241072B1 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114345684A (zh) * 2021-12-13 2022-04-15 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） 一种用于矿石的原石分离装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL160340B1 (pl) 1989-04-28 1993-02-26 Przesiewacz wibracyjny PL
PL167019B1 (pl) 1992-04-28 1995-07-31 Politechnika Lodzka Przesiewacz wibracyjny
US6513664B1 (en) 2001-04-18 2003-02-04 M-I, L.L.C. Vibrating screen separator
CN101690931A (zh) 2009-10-15 2010-04-07 鞍山重型矿山机器股份有限公司 一种球形轨迹振动筛
US20110060469A1 (en) * 2008-05-16 2011-03-10 M-I L.L.C. Methods to increase force and change vibratory separator motion
US20190329295A1 (en) * 2018-04-30 2019-10-31 Vermeer Manufacturing Company Shaker assemblies having a vibratory screen clamping system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL160340B1 (pl) 1989-04-28 1993-02-26 Przesiewacz wibracyjny PL
PL167019B1 (pl) 1992-04-28 1995-07-31 Politechnika Lodzka Przesiewacz wibracyjny
US6513664B1 (en) 2001-04-18 2003-02-04 M-I, L.L.C. Vibrating screen separator
US20110060469A1 (en) * 2008-05-16 2011-03-10 M-I L.L.C. Methods to increase force and change vibratory separator motion
CN101690931A (zh) 2009-10-15 2010-04-07 鞍山重型矿山机器股份有限公司 一种球形轨迹振动筛
US20190329295A1 (en) * 2018-04-30 2019-10-31 Vermeer Manufacturing Company Shaker assemblies having a vibratory screen clamping system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114345684A (zh) * 2021-12-13 2022-04-15 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） 一种用于矿石的原石分离装置

Also Published As

Publication number Publication date
PL432369A1 (pl) 2021-06-28
PL241072B1 (pl) 2022-08-01

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