WO1990004466A1 - Screening device for particulate material - Google Patents
Screening device for particulate material Download PDFInfo
- Publication number
- WO1990004466A1 WO1990004466A1 PCT/GB1989/001238 GB8901238W WO9004466A1 WO 1990004466 A1 WO1990004466 A1 WO 1990004466A1 GB 8901238 W GB8901238 W GB 8901238W WO 9004466 A1 WO9004466 A1 WO 9004466A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- screen
- screening
- screen frame
- elements
- holder
- Prior art date
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
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling 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
- B07B1/12—Apparatus having only parallel elements
Definitions
- This invention relates to a screening device for particulate material, and may be used in the screening of materials such as earth, sand, gravel, coke, slag, building waste and the like, in order to separate-out or screen-out relatively large pieces of material or other items e.g. stones, roots and the like from the material supplied to a screen of the device.
- materials such as earth, sand, gravel, coke, slag, building waste and the like
- Screen bars which are individually hinged to the upper end of a screen frame, and this allows the bars to move excessively, thereby allowing unintended oversize material to slip through the screen.
- the screen bars must, ; however, be given sufficient freedom of movement at the lower end of the screen frame so as to enable them to vibrate adequately, whilst not allowing any oversize material to fall through the screen.
- Certain existing designs of screen provide guides of V-shaped slots between the bars, in an attempt to remedy the undesired excessive vibration of the bars, but this has the adverse effect of unduly restricting the movement of the bars, and thereby reducing the efficient screenng capacity.
- the present invention has been developed with a view to providing a screening device having improved mounting of the screening elements which permit limited vibration of the elements in such a way that efficient screening is achieved, while minimising the risk of unintended oversize material passing through the screen.
- a screening device for separating-out relatively large pieces of material from a supply of particulate material, and which comprises: a base frame: a screen frame mounted on the base frame: and. a screen comprising a plurality of cantilever type elongate screening elements laterally spaced from each other and with each element being mounted at one end on the screen frame and being substantially unrestrained throughout its length towards the opposite end thereof, said screen being capable of receiving a supply of material so as to hold-back any relatively large pieces of material while allowing the screened material to fall under gravity through the spaces between the elements: in which: the elements are arranged in groups of elements, with each group being carried by a respective one of a plurality of element holders: the holders are pivotally mounted on the screen frame so as to be capable of carrying out pivotal movement independently of each other; and, the elements of each group are each rigidly mounted at one end on the respective holder so as to-be capable of moving jointly with the holder during its pivotal movement, and each element extends away from its rigid mounting
- each group is held firmly at a common end on the respective holder, but are generally free to vibrate throughout their lengths. This enables satisfactory screening to take place, with vibration of the elements being permitted, but the rigid mounting of each element on its holder means that the elements do not vibrate too loosely so as to allow oversized material to pass through the screen.
- each element is formed by welding of the element to its holder, though evidently other means may be adopted as desired.
- the screen frame may be supported on the base frame via at least two spring devices or other resilient means. which transmits the weight of the screen frame to the base frame, and absorbs the impact of the material fed onto the t screen, thereby allowing individual holders and associated groups of elements to vibrate, thereby giving an efficient screening process, and also facilitating cleaning of the surface of the screening elements, usually by self cleaning in service.
- the screen frame is mounted at an inclination to the horizontal, and may be pivotally mounted at its lower end to the base frame, and supported at its upper end on the base frame via a spring device arrangement .
- a piston cylinder arrangement may be provided to adjust the pivotal inclination of the screen frame to the base frame, to vary the attitude of the screen to any particular screening operation.
- each holder may be adjustable in its pivotal attitude with respect to the screen frame on which it is mounted, and this also may be controlled under the action of a respective piston cylinder device.
- the elongate screening elements preferably take the form of screening bars which may be of any desired cross section, such as rectangular, circular or pear shaped.
- Figure 1 is a perspective and schematic view of the screening device
- Figure 2 is a cross sectional illustration of alternative profiles of screening elements or screening _ bars of the screening device
- Figure 3 is a detail illustrating the manner by which - a number of screen bar holders are independently mounted on a screen frame of the device.
- Figure 4 is a schematic side view of the screening device.
- a screening device is designated generally by reference 10 and is intended for separating-out relatively large pieces of material from a supply of particulate material, such as large stones, roots and the like from a supply of particulate material.
- the device 10 comprises a base frame 11, a screen frame 12 mounted on the base frame 11, and a screen, designated generally by reference 13, which is mounted on the screen frame 12.
- the screen 13 is formed of a plurality of cantilever type screening elements or bars 14 which are laterally spaced from each other at predetermined spacings, and with each bar 14 being mounted at one end on the screen frame 12 but being substantially unrestrained throughout its length towards the opposite end thereof.
- the screen 13 is capable of receiving a supply of material and operating so as to hold-back -any relatively large pieces of material while allowing the screened material to fall under gravity through the spaces between the bars.
- the bars 14 are arranged in groups, with each group being carried by a respective one of a plurality of independently mounted section holders 15.
- the holders 15 are pivotally mounted on the screen frame 12 so as to be capable of carrying out pivotal movement independently of each other.
- the bars 14 in each group associated with a respective one of the holders 15 are each rigidly mounted at their upper ends on the holder so as to be capable of moving jointly with the holder during its pivotal movement.
- each bar extends away from its rigid mounting on the holder in substantially unrestrained manner towards its lower end. so as to be capable of vibrating in order to assist the screening operation.
- the rigid mounting of each bar at its upper end the bar does not vibrate too loosely, which might otherwise allow unintended oversize material to pass through the screen.
- the bars 14 are rigidly mounted on the holders 15 by being welded thereto, though evidently other means may be adopted.
- the lower end 16 of the screen frame 12 is pivotally y mounted on the base frame 11, but its upper end is resiliently supported on the base frame 11 through the intermediary of at least two spring devices 20 or other resilient arrangement below a top beam 17 of the screen frame 12.
- the spring arrangement 20 takes the weight off the screen frame and also absorbs the impact of the material fed onto the screen, thereby allowing the individual screen sections (each holder 15 and its respective group of screening bars 14) to vibrate, as well as the individual lateral vibrations of each bar, thereby giving an efficient screening process as well as facilitating easy cleaning of the surface of the screening bars. For many materials, this will be a.self cleaning operation in service.
- Each holder 15 is hinged or pinned to the top beam 17 via pins 18, and has a number of screening bars 14 rigidly attached thereto at desired lateral spacings. In the illustrated embodiment, each holder 15 has five screening bars associated therewith, though this number is not critical. It will be noted from Figure 3 that the hinge joint of each holder 15 is beneath the holder and behind the top beam 17 of the screen frame 12.
- the screening bars are all of even length and lie longitudinally the length of the screen frame from the top beam 17 to slightly beyond the position where the lower end 16 of the screen frame 12 is hinged to the base frame.
- the cross section of the bars can be of circular, rectangular or pear shape as shown in Figure 2.
- the hinged joints at the lower end of the screen frame, and at the point where each holder is hinged to the top beam of the screen frame, enable the angle of the screen frame to the base frame, and also the angle of the bars to the screen frame, respectively to be adjusted, up to 90° angles as desired. This movement is facilitated by means of piston cylinder devices, such as hydraulic rams 19.
Abstract
There is disclosed a screening device (10) for separating out relatively large pieces of material from a supply of particulate material, and which comprises a base frame (11), a screen frame (12) mounted on the base frame (11), and a screen (13) mounted on the screen frame (12) and formed of a plurality of cantilever type screening elements or bars (15) which are laterally spaced from each other at predetermined spacings, and with each bar (14) being mounted at one end on the screen frame (12) but being substantially unrestrained throughout its length towards the opposite ends thereof. The screen (13) is capable of receiving a supply of material and operating so as to holdback any relatively large pieces of material while allowing the screened material to fall under gravity through the spaces between the bars (14), and the bars (14) are arranged in groups, with each group being carried by a respective one of a plurality of independently mounted holders (15). Therefore, each holder (15) and its associated group of bars (14) can carry out joint pivotal movement, independently of each of the other holders and associated screening bars, and this facilitates an efficient screening operation, while minimising the risk of unintended oversized material passing through the screen.
Description
SCREENING DEVICE FOR PARTICULATE MATERIAL
This invention relates to a screening device for particulate material, and may be used in the screening of materials such as earth, sand, gravel, coke, slag, building waste and the like, in order to separate-out or screen-out relatively large pieces of material or other items e.g. stones, roots and the like from the material supplied to a screen of the device.
Existing designs of screening device have screens formed by screen bars which are individually hinged to the upper end of a screen frame, and this allows the bars to move excessively, thereby allowing unintended oversize material to slip through the screen. The screen bars must, ; however, be given sufficient freedom of movement at the lower end of the screen frame so as to enable them to vibrate adequately, whilst not allowing any oversize material to fall through the screen.
Certain existing designs of screen provide guides of V-shaped slots between the bars, in an attempt to remedy the undesired excessive vibration of the bars, but this has the adverse effect of unduly restricting the movement of the bars, and thereby reducing the efficient screenng capacity.
The present invention has been developed with a view to providing a screening device having improved mounting of the screening elements which permit limited vibration of the elements in such a way that efficient screening is achieved, while minimising the risk of unintended oversize material passing through the screen.
According to the invention there is provided a screening device for separating-out relatively large pieces of material from a supply of particulate material, and which comprises: a base frame: a screen frame mounted on the base frame: and.
a screen comprising a plurality of cantilever type elongate screening elements laterally spaced from each other and with each element being mounted at one end on the screen frame and being substantially unrestrained throughout its length towards the opposite end thereof, said screen being capable of receiving a supply of material so as to hold-back any relatively large pieces of material while allowing the screened material to fall under gravity through the spaces between the elements: in which: the elements are arranged in groups of elements, with each group being carried by a respective one of a plurality of element holders: the holders are pivotally mounted on the screen frame so as to be capable of carrying out pivotal movement independently of each other; and, the elements of each group are each rigidly mounted at one end on the respective holder so as to-be capable of moving jointly with the holder during its pivotal movement, and each element extends away from its rigid mounting on its holder in substantially unrestrained manner so as to be capable of vibrating in order to assist the screening operation.
Thus, in service, the elements in each group are held firmly at a common end on the respective holder, but are generally free to vibrate throughout their lengths. This enables satisfactory screening to take place, with vibration of the elements being permitted, but the rigid mounting of each element on its holder means that the elements do not vibrate too loosely so as to allow oversized material to pass through the screen.
Preferably, the rigid mounting of each element is formed by welding of the element to its holder, though evidently other means may be adopted as desired.
The screen frame may be supported on the base frame via at least two spring devices or other resilient means.
which transmits the weight of the screen frame to the base frame, and absorbs the impact of the material fed onto the t screen, thereby allowing individual holders and associated groups of elements to vibrate, thereby giving an efficient screening process, and also facilitating cleaning of the surface of the screening elements, usually by self cleaning in service.
Preferably, the screen frame is mounted at an inclination to the horizontal, and may be pivotally mounted at its lower end to the base frame, and supported at its upper end on the base frame via a spring device arrangement .
A piston cylinder arrangement may be provided to adjust the pivotal inclination of the screen frame to the base frame, to vary the attitude of the screen to any particular screening operation. In addition, each holder may be adjustable in its pivotal attitude with respect to the screen frame on which it is mounted, and this also may be controlled under the action of a respective piston cylinder device.
The elongate screening elements preferably take the form of screening bars which may be of any desired cross section, such as rectangular, circular or pear shaped.
One embodiment of screening device according to the invention will now be described in detail, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a perspective and schematic view of the screening device;
Figure 2 is a cross sectional illustration of alternative profiles of screening elements or screening _ bars of the screening device;
Figure 3 is a detail illustrating the manner by which - a number of screen bar holders are independently mounted on a screen frame of the device; and,
Figure 4 is a schematic side view of the screening
device.
Referring now to the drawings, a screening device according to the invention is designated generally by reference 10 and is intended for separating-out relatively large pieces of material from a supply of particulate material, such as large stones, roots and the like from a supply of particulate material. The device 10 comprises a base frame 11, a screen frame 12 mounted on the base frame 11, and a screen, designated generally by reference 13, which is mounted on the screen frame 12. The screen 13 is formed of a plurality of cantilever type screening elements or bars 14 which are laterally spaced from each other at predetermined spacings, and with each bar 14 being mounted at one end on the screen frame 12 but being substantially unrestrained throughout its length towards the opposite end thereof.
The screen 13 is capable of receiving a supply of material and operating so as to hold-back -any relatively large pieces of material while allowing the screened material to fall under gravity through the spaces between the bars.
The bars 14 are arranged in groups, with each group being carried by a respective one of a plurality of independently mounted section holders 15. The holders 15 are pivotally mounted on the screen frame 12 so as to be capable of carrying out pivotal movement independently of each other. The bars 14 in each group associated with a respective one of the holders 15 are each rigidly mounted at their upper ends on the holder so as to be capable of moving jointly with the holder during its pivotal movement. However, each bar extends away from its rigid mounting on the holder in substantially unrestrained manner towards its lower end. so as to be capable of vibrating in order to assist the screening operation. However, by virtue of the rigid mounting of each bar at its upper end, the bar does not vibrate too loosely, which might otherwise allow
unintended oversize material to pass through the screen.
In the illustrated embodiment, the bars 14 are rigidly mounted on the holders 15 by being welded thereto, though evidently other means may be adopted.
A. The lower end 16 of the screen frame 12 is pivotally y mounted on the base frame 11, but its upper end is resiliently supported on the base frame 11 through the intermediary of at least two spring devices 20 or other resilient arrangement below a top beam 17 of the screen frame 12. The spring arrangement 20 takes the weight off the screen frame and also absorbs the impact of the material fed onto the screen, thereby allowing the individual screen sections (each holder 15 and its respective group of screening bars 14) to vibrate, as well as the individual lateral vibrations of each bar, thereby giving an efficient screening process as well as facilitating easy cleaning of the surface of the screening bars. For many materials, this will be a.self cleaning operation in service.
Each holder 15 is hinged or pinned to the top beam 17 via pins 18, and has a number of screening bars 14 rigidly attached thereto at desired lateral spacings. In the illustrated embodiment, each holder 15 has five screening bars associated therewith, though this number is not critical. It will be noted from Figure 3 that the hinge joint of each holder 15 is beneath the holder and behind the top beam 17 of the screen frame 12.
The screening bars are all of even length and lie longitudinally the length of the screen frame from the top beam 17 to slightly beyond the position where the lower end 16 of the screen frame 12 is hinged to the base frame. The cross section of the bars can be of circular, rectangular or pear shape as shown in Figure 2.
The hinged joints at the lower end of the screen frame, and at the point where each holder is hinged to the top beam of the screen frame, enable the angle of the
screen frame to the base frame, and also the angle of the bars to the screen frame, respectively to be adjusted, up to 90° angles as desired. This movement is facilitated by means of piston cylinder devices, such as hydraulic rams 19.
Claims
1. A screening device for separating-out relatively large pieces of material from a supply of particulate material, and which comprises: a base frame: a screen frame mounted on the base frame; and, a screen comprising a plurality of cantilever type elongate screening elements laterally spaced from each other and with each element being mounted at one end on the screen frame and being substantially unrestrained throughout its length towards the opposite end thereof, said screen being capable of receiving a supply of material so as to hold-back any relatively large pieces of material while allowing the screened material to fall under gravity through the spaces between the elements; in which: the elements are arranged in groups of elements, with each group being carried by a respective one of a plurality of element holders; the holders are pivotally mounted on the screen frame so as to be capable of carrying out pivotal movement independently of each other; and. the elements of each group are each rigidly mounted at one end on the respective holder so as to be capable of moving jointly with the holder during its pivotal movement, and each element extends away from its rigid mounting on its holder in substantially unrestrained manner so as to be capable of vibrating in order to assist the screening operation.
2. A screening device according to Claim 1, in which each element is rigidly mounted on its respective holder by a welded joint.
3. A screening device according to Claim 1 or 2, in which the screen frame is supported on the base frame via a resilient support arranged to transmit the weight of the screen frame to the base frame, and to absorb the impact of the material fed onto the screen, thereby allowing individual holders and associated groups of elements to vibrate during a screening process.
4. A screening device according to any one of Claims 1 to 3, in which the screen frame is mounted at an inclination to the horizontal, and is pivotally mounted at its lower end on the base frame.
5. A screening device according to any one of Claims 1 to 4, in which a piston / cylinder arrangement is provided to adjust the pivotal inclination of the screen frame to the base frame, to vary the attitude of the screen to any particular screening operation.
6. A screening device according to Claim 5, in which each holder is adjustable in its pivotal attitude with respect to the screen frame on which it is mounted.
7. A screening device according to Claim 6, in which the pivotal adjustment of each holder is controlled under the action of a respective piston / cylinder device.
8. A screening device according to any one of the preceding claims, in which the elongate screening elements take the form of screening bars.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB888824930A GB8824930D0 (en) | 1988-10-25 | 1988-10-25 | Screening device for particulate material |
| GB8824930.5 | 1988-10-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1990004466A8 WO1990004466A8 (en) | 1990-05-03 |
| WO1990004466A1 true WO1990004466A1 (en) | 1990-05-03 |
Family
ID=10645734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB1989/001238 WO1990004466A1 (en) | 1988-10-25 | 1989-10-19 | Screening device for particulate material |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU4501489A (en) |
| GB (1) | GB8824930D0 (en) |
| WO (1) | WO1990004466A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992017646A1 (en) * | 1991-03-29 | 1992-10-15 | 2C-2M Di Morara Claudio E Menzani Claudio S.N.C. | A sifting machine for railway ballast |
| EP1400288A2 (en) * | 2002-09-19 | 2004-03-24 | HMH Engineering-Consulting Trading GmbH | Device for separating coarse and fine particles |
| WO2008020309A2 (en) * | 2006-03-24 | 2008-02-21 | W.S. Tylinter | Screen device and method of making the same |
| WO2009004278A2 (en) * | 2007-07-04 | 2009-01-08 | Rcw Investments Ltd | Apparatus for sorting waste materials |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1186731A (en) * | 1967-04-21 | 1970-04-02 | Hugo Andersson | Improvements in or relating to Arrangements for Handling Bulk Material |
| GB1555028A (en) * | 1975-10-13 | 1979-11-07 | Eriksson J E | Screen |
| SU761031A1 (en) * | 1973-09-26 | 1980-09-07 | Krivorozh Gornorudnyj I | Riddle |
| DE2948273A1 (en) * | 1979-03-27 | 1980-10-02 | Voest Alpine Ag | Sorting grid with fixed bars for particle materials - can be raised and bars moved sideways for removal of clogged parts (OE 15.4.80) |
| SU795582A1 (en) * | 1975-10-22 | 1981-01-15 | Институт Геотехнической Механикиакадемии Наук Украинской Ccp | Sieve |
-
1988
- 1988-10-25 GB GB888824930A patent/GB8824930D0/en active Pending
-
1989
- 1989-10-19 WO PCT/GB1989/001238 patent/WO1990004466A1/en unknown
- 1989-10-19 AU AU45014/89A patent/AU4501489A/en not_active Abandoned
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1186731A (en) * | 1967-04-21 | 1970-04-02 | Hugo Andersson | Improvements in or relating to Arrangements for Handling Bulk Material |
| SU761031A1 (en) * | 1973-09-26 | 1980-09-07 | Krivorozh Gornorudnyj I | Riddle |
| GB1555028A (en) * | 1975-10-13 | 1979-11-07 | Eriksson J E | Screen |
| SU795582A1 (en) * | 1975-10-22 | 1981-01-15 | Институт Геотехнической Механикиакадемии Наук Украинской Ccp | Sieve |
| DE2948273A1 (en) * | 1979-03-27 | 1980-10-02 | Voest Alpine Ag | Sorting grid with fixed bars for particle materials - can be raised and bars moved sideways for removal of clogged parts (OE 15.4.80) |
Non-Patent Citations (2)
| Title |
|---|
| Soviet Inventions Illustrated, Week D20, 24 June 1981, Derwent Publications Ltd (London, GB) see Class P43, * Abstract No. E5833 & SU-A-761031 (Kriv Mining Ore Ins) 7 September 1980* * |
| Soviet Inventions Illustrated, Week D39, 4 November 1981, Derwent Publications Ltd (London, GB) see Class J01P43* Abstract No. 71458 & SU-A-795582 (As UKR Geotech Mech) 25 January 1981* * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992017646A1 (en) * | 1991-03-29 | 1992-10-15 | 2C-2M Di Morara Claudio E Menzani Claudio S.N.C. | A sifting machine for railway ballast |
| EP1400288A2 (en) * | 2002-09-19 | 2004-03-24 | HMH Engineering-Consulting Trading GmbH | Device for separating coarse and fine particles |
| EP1400288A3 (en) * | 2002-09-19 | 2006-11-02 | HMH Engineering-Consulting Trading GmbH | Device for separating coarse and fine particles |
| WO2008020309A2 (en) * | 2006-03-24 | 2008-02-21 | W.S. Tylinter | Screen device and method of making the same |
| WO2008020309A3 (en) * | 2006-03-24 | 2008-06-12 | W S Tylinter | Screen device and method of making the same |
| WO2009004278A2 (en) * | 2007-07-04 | 2009-01-08 | Rcw Investments Ltd | Apparatus for sorting waste materials |
| WO2009004278A3 (en) * | 2007-07-04 | 2009-02-26 | Rcw Invest Ltd | Apparatus for sorting waste materials |
Also Published As
| Publication number | Publication date |
|---|---|
| AU4501489A (en) | 1990-05-14 |
| WO1990004466A8 (en) | 1990-05-03 |
| GB8824930D0 (en) | 1988-11-30 |
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