CA1304718C - Vibratory screening apparatus - Google Patents
Vibratory screening apparatusInfo
- Publication number
- CA1304718C CA1304718C CA000511418A CA511418A CA1304718C CA 1304718 C CA1304718 C CA 1304718C CA 000511418 A CA000511418 A CA 000511418A CA 511418 A CA511418 A CA 511418A CA 1304718 C CA1304718 C CA 1304718C
- Authority
- CA
- Canada
- Prior art keywords
- hose
- screen
- screen unit
- basket
- screening apparatus
- 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
Links
- 238000012216 screening Methods 0.000 title claims abstract description 14
- 238000010276 construction Methods 0.000 description 10
- 239000012530 fluid Substances 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/48—Stretching devices for screens
Landscapes
- Combined Means For Separation Of Solids (AREA)
- Supports Or Holders For Household Use (AREA)
Abstract
Abstract A basket of vibratory screening apparatus has an inflatable hose positioned to overlie a part of a screen unit mounted in the basket. Inflation of the hose causes it to press against a frame of the screen unit clamping it against a support of the basket 101. The hose is at least partially flattened on its underside when inflated and a resilient ring surrounds the hose to bear against the flattened underside. During deflation of the hose the ring assists deflation and flattening of the hose.
Description
13~17~
VIBRaTORY. SCREENING Al?Pl~R~TUS
This invention concerns the mounting of screens in vibratory apparatus such as is used for the sifting of mud and the like materials derived from oil-well drilling.
It is known to mount a screen in a frame and mount the latter in a basket mounted within a machine housing adapted to be oscillated or otherwise vibrated as by a cam drive mechanism.
For servicing and replacement it is desirable to be able to remove the screen and its associated frame where provided, from the machine, and to this end the latter is adapted to be slid into and out of the basket, and clamping means is provided to hold the frame and screen in position. Clearly it is desirable that the clamping shall be effected as quickly as possible to reduce down time.
It is known to make the frame for the screen inflatable, in order to provide a means for tensioning the screen within the vibratory apparatus. In EP-A-0130744 there is proposed a screen having an inflatable screen frame which, on inflation, both tensions the screen and clamps it in position in the screening device. However, this arrangement is of limited application. Since the inflation of the screen frame both clamps the screen in position and tensions it, the arrangement cannot be used with screens that are to be tensioned in some other manner such as by a tensioning clip or screw on the basket of the vibratory apparatus, or that are pretensioned within a rigid frame. Additionally, since the same act of inflation both clamps the screen and tensions it, the clamping force and the tensioning force cannot be controlled independently. Finally, it is necessary for each screen to be associated with its own respective clamping arrangement, since this is incorporated in the screen frame, even when the screen ~ f$
OJ -.~
13~4~
is not mounted within a vibratory screening apparatus, and thus it is necessary to fabricate as many inflatable frames as there are screens.
It is also known to mount a screen in a frame and mount the latter in a basket mounted within a machine housing adapted to be oscillated or otherwise vibrated as by a cam drive mechanism.
It is therefore an object of the present invention to provide an improved vibratory screening apparatus.
The present invention consists of vibratory screening apparatus in which a screen unit may be releasably mounted, the apparatus comprising a vibratory basket carrying upper and lower supports; a screen unit seating on the lower support;
and an inflatable device releasably mounted to the upper support, wherein the inflatable device comprises a hose at least partially flattened on its underside when inflated to press substantially flatly to urge said screen unit into tight engagement with the lower support, said hose having associated means for enabling its releasable mounting to the upper support, said hose additionally comprising a resilient ring surrounding the hose and bearing against said partially flattened underside of the hose, whereby during deflation of the hose said ring assists the deflation and flattening of said hose.
Preferably, the screen unit comprises a screen located in a screen frame, and the hose, when inflated in use, presses against the screen frame.
It may be arranged that the hose, when inflated in use, presses against a portion of the screen unit spaced from its periphery.
Alternatively, the construction may be such that the hose, g\ '~
~3~r47~3 when inflated in use, presses against at least a portion of the periphery of the screen unit.
In the preferred constructions the hose is deflatable to allow the screen unit to be released for withdrawal from the said apparatus.
In the drawings:
Figure l is a schematic view of a clamping device;
Figure 2 is a schematic sectional view showing the device of Figure l and a screen unit mounted in a basket of vibratory apparatus;
Figure 3 is a schematic view of an alternative construction of clamping device;
Figure 4 is a schematic sectional view of the construction of Figure 3 and a screen unit mounted in a basket of vibratory apparatus;
Figure 5 is a schematic view of a third construction;
Figure 6 is a schematic sectional view of the construction of Figure 5 and a screen unit mounted in a basket of vibratory apparatus;
Figure 7 is a schematic sectional view of a fourth construction;
Figure 8 is a schematic sectional view of a fifth construction;
Figure 9 is an end view of a form of inflatable hose in accordance with an embodiment of the invention; and ~, 13~71~
Figure 10 is an end view of a further embodiment of the invention utilizing different hose types.
In Figures 1 and 2 a clamping device has an intermediate frame member 1 comprising an L-section portion 3 extending around three sides of a rectangle to form a U-shape, and a strut 5 across the mouth of the U to provide strength and rigidity.
The frame member 1 is made of a relatively strong and rigid material such as steel.
The L-section 3 carries an inflatable hose 7 on its upper surface. One end of the hose 7 is extended to a ~upply line 9 by means of which inflation fluid may be introduced as indicated by arrow an 11.
As shown in Figure 2, in use, the device of Figure 1 is inserted together with a screen unit comprising a screen 13 mounted in a screen frame 15, between two lateral projections 17, 19 of a basket 21 of vibratory screening apparatus. The screen unit and the clamping device are arranged so that the screen frame 15 is opposed to the upper projection 17 of the basket 21 and the L-section portion 3 of the clamping device is opposed to the lower lateral projection 19 of the basket, with the inflatable hose 7 between the L-section 3 and the screen frame 15. For reasons of clarity, the vertical spacing of the members has been exaggerated in Figure 2 (and also in Figures 4 and 6~.
Inflation of the hose 7 causes it to expand, so that it presses the screen frame 15 tightly against the upper projection 17 of the basket 21. The clamping device is prevented from moving downwardly away from the screen unit by reaction between the L-section portion 3 and the lower projection 1~ of the basket 21. In this manner, the screen unit comprising the screen 13 and the screen frame 15 is clamped in position in the basket 21.
'.
13(~4~
In order to provide the inflation of the hose 7, pressurized fluid, such as air or hydraulic fluid, is provided through the supply line 9 as indicated by the arrow ll. As shown in Figure 1, the supply line 9 also has a branch 23 leading to a S pressure relief valve 25. Valve 25 is kept normally closed, but can be opened to allow deflation of the hose 7. Deflation of the hose 7 releases the clamping action on the screen frame 15, so that the screen unit can be removed from the basket 21 for cleaning, replacement etc.
It may be desirable, especially when the inflation fluid for the hose 7 is not compressed air, for the inflation fluid exhausted through the valve 25 to be recovered. For this purpose, the branch 23 in the supply line may be extended beyond the valve 25 to a reservoir, indicated schematically in Figure l at 27, where exhausted fluid may be collected.
Figure 3 shows an alternative embodiment of clamping device in which the intermediate frame member 1 is formed from a semi-circular section member 29, which again may be of steel. The inflatable hose 7 lies within the concavity of the semi-circular section.
In Figure 3, the semi-circular sectioned portion 29 and the hose 7 extend around three sides of a rectangle, as did the L-section portion 3 and the hose 7 in Figure 1. However, in addition, the semi-circular section portion 29 and the hose 7 have two longitudinal portions extending asross the rectangle thus defined.
The pressurized fluid supply line 9 extends along the fourth side of the rectangle and is connected to the hose 7 at the ends of the adjacent two sides of the rectangle and the ends of the two portions extending across the rectangle.
Preferably, the supply line 9 is relatively rigid or is supported on a relatively rigid member at least where it 9~
13~4~
forms the fourth side of the rectangle so as to increasP the strength and rigidity of the clamping device as a whole.
As shown in Figure 4, the clamping device of Figure 3 is intended to be used with a basket that provides clamping support members 31, 33 for the screen unit at intermediate positions across the width of the screen unit. Although the screen 13 of the screen unit may extend across the positions of these intermediate support member 31, 33, it is preferred that the screen frame 15 divides the screen 13 into separate regions, and portions of the screen frame 15 are provided in positions opposed to the supporting members 31, 33.
In use, the device of Figure 3 rests on the lower support members 33 of the basket and the screen unit is positioned between the hose 7 and the upper support members 31.
Preferably, the lower ends of the upper support members 31, which will contact the screen member directly, are of a -resilient material, such as rubber.
The device of Figure 3 is used in a manner similar to the device of Figure l. The hose 7 may be inflated to press the screen member against the upper support members 31~ and the device is itself supported by the lower support members 33.
Figure 5 shows another construction of clamping device in which the intermediate frame member 1 comprises an E-shape formed from flat strip portions 35. The hose 7 is bonded to the strip 35. The fluid supply line 9 is not shown in Figure 5 but may be provided in a manner similar to that of Figure 3.
As is shown in Figure 6, the basket 21 provides upper and lower lateral projections 17, 19 by means of which expansion of the inflatable hose 7 clamps the screen unit to the basket 21. Additionally, the basket 21 has upper and lower suppoxt members 31, 33 in a manner similar to the arrangement of Figure 4, midway between the two sides of the screen unit, and g~
13~71~
the screen unit has a portion of the screen frame 15 at this point, so that the middle arm of the E-shaped device clamps the central portion of the screen unit between the upper and lower support member 31, 33 of the basket 21.
Figure 7 shows a basket 101 of vibratory screening apparatus in which there is located an expansible elastomeric hose 103.
A removable screen unit comprising a screen 105 and a screen frame 107 is mounted within the basket 101 and is supported by lateral projections 109 of the basket.
The lateral projections 109 support the screen unit immediately below the hose 103. The hose is secured to the basket at its upper side, so that inflation of the hose causes it to expand downwardly and press the screen unit against the lateral projections 109 so as to hold the screen unit firmly in place in the basket 101. The vertical spacing between members has been exaggerated in Figure 7 (and also in Figure 8) for clarity.
The hose 103 extends around the periphery only of the area defined by the basket 101. The screen frame 107 forms the periphery of the screen unit, and when the hose 103 is inflated it presses against the screen frame 107 only, and does not contact the screen 105.
A supply line 111 is provided in order to convey pressurized air, hydraulic oil, or other suitable medium to the hose 103, as indicated by the arrow 113, in order to inflate it. The supply line 111 has a branch 115 leading to a pressure relief valve 117 whereby the inflation pressure in the hose can be relieved and the hose deflated. This releases the clamping effect on the screen unit, so that it may be removed for replacement or cleaning.
When the inflation medium for the hose 103 is not air, it may be desirable to collect it as it is exhausted from the member . ~
~ ' 13(~47~8 103 through the valve 117. Accordingly, the branch line 115 is shown in Figure 7 to extend beyond the valve 117 to a reservoir 119 where vented inflation fluid may be collected.
Typically, the embodiment of Figure 7 will be used with screens that are pre-tensioned against their screen frames.
Figure 8 shows another construction used with a screen unit in which the screen is tensioned after insertion into the basket.
At the periphery of the screen unit, the screen frame 107 terminates in a turned back edge to form a hook strip 121. A
tension rail 123 is attached to the side wall of the basket 101 by a tension bolt 125. The hook strip 121 is hooked around a part of the tension rail 123 when the screen unit is inserted into the basket, and tightening of the tension bolt 125 moves the tension rail outwardly towards the side wall 101 of the basket so as to tension the screen unit.
In this arrangement, the basket 101 also has steel support members 127, 129 extending across the screen unit. Normally, the screen unit will be selected so that portions of the screen frame 107 are opposed to these support members 127, 129, with strips of screen 105 in between.
The lower support members 129 terminate in solid rubber end pieces 131. The upper support members 127 terminate in hollow rubber end pieces which form inflatable hoses 103.
In order to clamp the screen member in position, the hoses 103 are inflated. On inflation, the hoses 103 expand and press the screen unit downwardly against the rubber end pieces 131.
In this way, the screen unit is held securely between the upper and lower supports 127, 129 of the basket 121.
It should be noted that in Figure 8, the hoses 103 not only extend alongside the walls of the basket 101 but also extend Dl 13~7?.!..8 across the area defined by those walls in positions spaced therefrom.
Figure 9 shows a preferred hose design according to the present invention in which a flattened hose 132 is attached along a central linear region of its upper surface to the underside of a support member 134 and is held in place by a ring or the like 136. The latter may be elastic. The resilience of the ring 136 helps to deflate and flatten the hose 132 when the inflation fluid is vented.
The embodiment of the invention shown in Figure 10 demonstrates how a combination of two different types of expansible hose can be used to secure a screen unit in place.
The generally square section hoses 138, 140 serve to grip the opposed edge regions of the screen frame and the intermediate hoses 142, 144 (of the type shown in Figure 9) are positioned across the width of the screen to engage stiffening ribs or other strengthening means 146, which may be parts of the screen frame 107, located at intervals across the screen unit.
D~ ~
VIBRaTORY. SCREENING Al?Pl~R~TUS
This invention concerns the mounting of screens in vibratory apparatus such as is used for the sifting of mud and the like materials derived from oil-well drilling.
It is known to mount a screen in a frame and mount the latter in a basket mounted within a machine housing adapted to be oscillated or otherwise vibrated as by a cam drive mechanism.
For servicing and replacement it is desirable to be able to remove the screen and its associated frame where provided, from the machine, and to this end the latter is adapted to be slid into and out of the basket, and clamping means is provided to hold the frame and screen in position. Clearly it is desirable that the clamping shall be effected as quickly as possible to reduce down time.
It is known to make the frame for the screen inflatable, in order to provide a means for tensioning the screen within the vibratory apparatus. In EP-A-0130744 there is proposed a screen having an inflatable screen frame which, on inflation, both tensions the screen and clamps it in position in the screening device. However, this arrangement is of limited application. Since the inflation of the screen frame both clamps the screen in position and tensions it, the arrangement cannot be used with screens that are to be tensioned in some other manner such as by a tensioning clip or screw on the basket of the vibratory apparatus, or that are pretensioned within a rigid frame. Additionally, since the same act of inflation both clamps the screen and tensions it, the clamping force and the tensioning force cannot be controlled independently. Finally, it is necessary for each screen to be associated with its own respective clamping arrangement, since this is incorporated in the screen frame, even when the screen ~ f$
OJ -.~
13~4~
is not mounted within a vibratory screening apparatus, and thus it is necessary to fabricate as many inflatable frames as there are screens.
It is also known to mount a screen in a frame and mount the latter in a basket mounted within a machine housing adapted to be oscillated or otherwise vibrated as by a cam drive mechanism.
It is therefore an object of the present invention to provide an improved vibratory screening apparatus.
The present invention consists of vibratory screening apparatus in which a screen unit may be releasably mounted, the apparatus comprising a vibratory basket carrying upper and lower supports; a screen unit seating on the lower support;
and an inflatable device releasably mounted to the upper support, wherein the inflatable device comprises a hose at least partially flattened on its underside when inflated to press substantially flatly to urge said screen unit into tight engagement with the lower support, said hose having associated means for enabling its releasable mounting to the upper support, said hose additionally comprising a resilient ring surrounding the hose and bearing against said partially flattened underside of the hose, whereby during deflation of the hose said ring assists the deflation and flattening of said hose.
Preferably, the screen unit comprises a screen located in a screen frame, and the hose, when inflated in use, presses against the screen frame.
It may be arranged that the hose, when inflated in use, presses against a portion of the screen unit spaced from its periphery.
Alternatively, the construction may be such that the hose, g\ '~
~3~r47~3 when inflated in use, presses against at least a portion of the periphery of the screen unit.
In the preferred constructions the hose is deflatable to allow the screen unit to be released for withdrawal from the said apparatus.
In the drawings:
Figure l is a schematic view of a clamping device;
Figure 2 is a schematic sectional view showing the device of Figure l and a screen unit mounted in a basket of vibratory apparatus;
Figure 3 is a schematic view of an alternative construction of clamping device;
Figure 4 is a schematic sectional view of the construction of Figure 3 and a screen unit mounted in a basket of vibratory apparatus;
Figure 5 is a schematic view of a third construction;
Figure 6 is a schematic sectional view of the construction of Figure 5 and a screen unit mounted in a basket of vibratory apparatus;
Figure 7 is a schematic sectional view of a fourth construction;
Figure 8 is a schematic sectional view of a fifth construction;
Figure 9 is an end view of a form of inflatable hose in accordance with an embodiment of the invention; and ~, 13~71~
Figure 10 is an end view of a further embodiment of the invention utilizing different hose types.
In Figures 1 and 2 a clamping device has an intermediate frame member 1 comprising an L-section portion 3 extending around three sides of a rectangle to form a U-shape, and a strut 5 across the mouth of the U to provide strength and rigidity.
The frame member 1 is made of a relatively strong and rigid material such as steel.
The L-section 3 carries an inflatable hose 7 on its upper surface. One end of the hose 7 is extended to a ~upply line 9 by means of which inflation fluid may be introduced as indicated by arrow an 11.
As shown in Figure 2, in use, the device of Figure 1 is inserted together with a screen unit comprising a screen 13 mounted in a screen frame 15, between two lateral projections 17, 19 of a basket 21 of vibratory screening apparatus. The screen unit and the clamping device are arranged so that the screen frame 15 is opposed to the upper projection 17 of the basket 21 and the L-section portion 3 of the clamping device is opposed to the lower lateral projection 19 of the basket, with the inflatable hose 7 between the L-section 3 and the screen frame 15. For reasons of clarity, the vertical spacing of the members has been exaggerated in Figure 2 (and also in Figures 4 and 6~.
Inflation of the hose 7 causes it to expand, so that it presses the screen frame 15 tightly against the upper projection 17 of the basket 21. The clamping device is prevented from moving downwardly away from the screen unit by reaction between the L-section portion 3 and the lower projection 1~ of the basket 21. In this manner, the screen unit comprising the screen 13 and the screen frame 15 is clamped in position in the basket 21.
'.
13(~4~
In order to provide the inflation of the hose 7, pressurized fluid, such as air or hydraulic fluid, is provided through the supply line 9 as indicated by the arrow ll. As shown in Figure 1, the supply line 9 also has a branch 23 leading to a S pressure relief valve 25. Valve 25 is kept normally closed, but can be opened to allow deflation of the hose 7. Deflation of the hose 7 releases the clamping action on the screen frame 15, so that the screen unit can be removed from the basket 21 for cleaning, replacement etc.
It may be desirable, especially when the inflation fluid for the hose 7 is not compressed air, for the inflation fluid exhausted through the valve 25 to be recovered. For this purpose, the branch 23 in the supply line may be extended beyond the valve 25 to a reservoir, indicated schematically in Figure l at 27, where exhausted fluid may be collected.
Figure 3 shows an alternative embodiment of clamping device in which the intermediate frame member 1 is formed from a semi-circular section member 29, which again may be of steel. The inflatable hose 7 lies within the concavity of the semi-circular section.
In Figure 3, the semi-circular sectioned portion 29 and the hose 7 extend around three sides of a rectangle, as did the L-section portion 3 and the hose 7 in Figure 1. However, in addition, the semi-circular section portion 29 and the hose 7 have two longitudinal portions extending asross the rectangle thus defined.
The pressurized fluid supply line 9 extends along the fourth side of the rectangle and is connected to the hose 7 at the ends of the adjacent two sides of the rectangle and the ends of the two portions extending across the rectangle.
Preferably, the supply line 9 is relatively rigid or is supported on a relatively rigid member at least where it 9~
13~4~
forms the fourth side of the rectangle so as to increasP the strength and rigidity of the clamping device as a whole.
As shown in Figure 4, the clamping device of Figure 3 is intended to be used with a basket that provides clamping support members 31, 33 for the screen unit at intermediate positions across the width of the screen unit. Although the screen 13 of the screen unit may extend across the positions of these intermediate support member 31, 33, it is preferred that the screen frame 15 divides the screen 13 into separate regions, and portions of the screen frame 15 are provided in positions opposed to the supporting members 31, 33.
In use, the device of Figure 3 rests on the lower support members 33 of the basket and the screen unit is positioned between the hose 7 and the upper support members 31.
Preferably, the lower ends of the upper support members 31, which will contact the screen member directly, are of a -resilient material, such as rubber.
The device of Figure 3 is used in a manner similar to the device of Figure l. The hose 7 may be inflated to press the screen member against the upper support members 31~ and the device is itself supported by the lower support members 33.
Figure 5 shows another construction of clamping device in which the intermediate frame member 1 comprises an E-shape formed from flat strip portions 35. The hose 7 is bonded to the strip 35. The fluid supply line 9 is not shown in Figure 5 but may be provided in a manner similar to that of Figure 3.
As is shown in Figure 6, the basket 21 provides upper and lower lateral projections 17, 19 by means of which expansion of the inflatable hose 7 clamps the screen unit to the basket 21. Additionally, the basket 21 has upper and lower suppoxt members 31, 33 in a manner similar to the arrangement of Figure 4, midway between the two sides of the screen unit, and g~
13~71~
the screen unit has a portion of the screen frame 15 at this point, so that the middle arm of the E-shaped device clamps the central portion of the screen unit between the upper and lower support member 31, 33 of the basket 21.
Figure 7 shows a basket 101 of vibratory screening apparatus in which there is located an expansible elastomeric hose 103.
A removable screen unit comprising a screen 105 and a screen frame 107 is mounted within the basket 101 and is supported by lateral projections 109 of the basket.
The lateral projections 109 support the screen unit immediately below the hose 103. The hose is secured to the basket at its upper side, so that inflation of the hose causes it to expand downwardly and press the screen unit against the lateral projections 109 so as to hold the screen unit firmly in place in the basket 101. The vertical spacing between members has been exaggerated in Figure 7 (and also in Figure 8) for clarity.
The hose 103 extends around the periphery only of the area defined by the basket 101. The screen frame 107 forms the periphery of the screen unit, and when the hose 103 is inflated it presses against the screen frame 107 only, and does not contact the screen 105.
A supply line 111 is provided in order to convey pressurized air, hydraulic oil, or other suitable medium to the hose 103, as indicated by the arrow 113, in order to inflate it. The supply line 111 has a branch 115 leading to a pressure relief valve 117 whereby the inflation pressure in the hose can be relieved and the hose deflated. This releases the clamping effect on the screen unit, so that it may be removed for replacement or cleaning.
When the inflation medium for the hose 103 is not air, it may be desirable to collect it as it is exhausted from the member . ~
~ ' 13(~47~8 103 through the valve 117. Accordingly, the branch line 115 is shown in Figure 7 to extend beyond the valve 117 to a reservoir 119 where vented inflation fluid may be collected.
Typically, the embodiment of Figure 7 will be used with screens that are pre-tensioned against their screen frames.
Figure 8 shows another construction used with a screen unit in which the screen is tensioned after insertion into the basket.
At the periphery of the screen unit, the screen frame 107 terminates in a turned back edge to form a hook strip 121. A
tension rail 123 is attached to the side wall of the basket 101 by a tension bolt 125. The hook strip 121 is hooked around a part of the tension rail 123 when the screen unit is inserted into the basket, and tightening of the tension bolt 125 moves the tension rail outwardly towards the side wall 101 of the basket so as to tension the screen unit.
In this arrangement, the basket 101 also has steel support members 127, 129 extending across the screen unit. Normally, the screen unit will be selected so that portions of the screen frame 107 are opposed to these support members 127, 129, with strips of screen 105 in between.
The lower support members 129 terminate in solid rubber end pieces 131. The upper support members 127 terminate in hollow rubber end pieces which form inflatable hoses 103.
In order to clamp the screen member in position, the hoses 103 are inflated. On inflation, the hoses 103 expand and press the screen unit downwardly against the rubber end pieces 131.
In this way, the screen unit is held securely between the upper and lower supports 127, 129 of the basket 121.
It should be noted that in Figure 8, the hoses 103 not only extend alongside the walls of the basket 101 but also extend Dl 13~7?.!..8 across the area defined by those walls in positions spaced therefrom.
Figure 9 shows a preferred hose design according to the present invention in which a flattened hose 132 is attached along a central linear region of its upper surface to the underside of a support member 134 and is held in place by a ring or the like 136. The latter may be elastic. The resilience of the ring 136 helps to deflate and flatten the hose 132 when the inflation fluid is vented.
The embodiment of the invention shown in Figure 10 demonstrates how a combination of two different types of expansible hose can be used to secure a screen unit in place.
The generally square section hoses 138, 140 serve to grip the opposed edge regions of the screen frame and the intermediate hoses 142, 144 (of the type shown in Figure 9) are positioned across the width of the screen to engage stiffening ribs or other strengthening means 146, which may be parts of the screen frame 107, located at intervals across the screen unit.
D~ ~
Claims (5)
1. Vibratory screening apparatus in which a screen unit may be releasably mounted, the apparatus comprising a vibratory basket carrying upper and lower supports; a screen unit seating on the lower support; and an inflatable device releasably mounted to the upper support, wherein the inflatable device comprises a hose at least partially flattened on its underside when inflated to press substantially flatly to urge said screen unit into tight engagement with the lower support, said hose having associated means for enabling its releasable mounting to the upper support, said hose additionally comprising a resilient ring surrounding the hose and bearing against said partially flattened underside of the hose, whereby during deflation of the hose said ring assists the deflation and flattening of said hose.
2. Vibratory screening apparatus according to claim 1, in which the screen unit comprises a screen located in a screen frame, and the hose, when inflated in use, presses against the screen frame.
3. Vibratory screening apparatus according to claim 1 or claim 2, in which the hose, when inflated in use, presses against a portion of the screen unit spaced from its periphery.
4. Vibratory screening apparatus according to claim 1, in which the hose, when inflated in use, presses against at least a portion of the periphery of the screen unit.
5. Vibratory screening apparatus according to claim 1 or 2, in which the hose is deflatable to allow the screen unit to be released for withdrawal from the said apparatus.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8514983 | 1985-06-13 | ||
| GB858514983A GB8514983D0 (en) | 1985-06-13 | 1985-06-13 | Screen clamping |
| GB8514982 | 1985-06-13 | ||
| GB858514982A GB8514982D0 (en) | 1985-06-13 | 1985-06-13 | Screen clamping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1304718C true CA1304718C (en) | 1992-07-07 |
Family
ID=26289367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000511418A Expired - Lifetime CA1304718C (en) | 1985-06-13 | 1986-06-12 | Vibratory screening apparatus |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0218315A3 (en) |
| AU (1) | AU583127B2 (en) |
| CA (1) | CA1304718C (en) |
| ES (1) | ES8706485A1 (en) |
| NO (1) | NO170199C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2631255B1 (en) * | 1988-05-16 | 1990-08-24 | Szilvasi Peter | REMOVABLE FRAMES OF CASSETTE OR CARTRIDGE-TYPE CRIBLES |
| US5690826A (en) * | 1996-05-10 | 1997-11-25 | Cravello; William Myron | Shaker screen assembly |
| GB0301509D0 (en) | 2002-10-17 | 2003-02-19 | Varco Int | Vibratory seperator and screen assembly |
| GB2408006B (en) * | 2003-11-13 | 2007-04-25 | Russel Finex | Improvements in screen separators |
| US8245850B2 (en) | 2003-11-13 | 2012-08-21 | Russell Finex Limited | Screen separators |
| EA016036B1 (en) * | 2007-10-05 | 2012-01-30 | Эм-Ай ЭлЭлСи | Screen clamp |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2279042A (en) * | 1940-08-03 | 1942-04-07 | Inland Lime & Stone Company | Screening apparatus |
| FR1282627A (en) * | 1960-12-13 | 1962-01-27 | Socam Sa | Device for sieve clamping |
| FR1326260A (en) * | 1962-06-26 | 1963-05-03 | Device for stretching sieving and filtering fabrics | |
| AT329474B (en) * | 1974-02-25 | 1976-05-10 | Oesterr Amerikan Magnesit | CLAMPING DEVICE FOR SCREEN BOTTOM |
| US4082657A (en) * | 1976-01-19 | 1978-04-04 | Gage Ernest L | Separator apparatus |
| GB2085744B (en) * | 1980-10-20 | 1984-06-13 | Thule United Ltd | Vibratory screening apparatus |
| EP0130744A3 (en) * | 1983-07-01 | 1986-03-05 | Sweco, Inc. | Separator screen and method of making same |
-
1986
- 1986-06-04 NO NO862214A patent/NO170199C/en unknown
- 1986-06-10 ES ES555914A patent/ES8706485A1/en not_active Expired
- 1986-06-10 EP EP86304423A patent/EP0218315A3/en not_active Ceased
- 1986-06-11 AU AU58567/86A patent/AU583127B2/en not_active Expired
- 1986-06-12 CA CA000511418A patent/CA1304718C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0218315A3 (en) | 1988-05-11 |
| NO862214D0 (en) | 1986-06-04 |
| AU5856786A (en) | 1986-12-18 |
| EP0218315A2 (en) | 1987-04-15 |
| NO170199B (en) | 1992-06-15 |
| AU583127B2 (en) | 1989-04-20 |
| ES8706485A1 (en) | 1987-07-01 |
| NO862214L (en) | 1986-12-15 |
| NO170199C (en) | 1992-09-23 |
| ES555914A0 (en) | 1987-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4846352A (en) | Screen clamp | |
| US4744898A (en) | Inflatable screen clamp | |
| CA2332539C (en) | Flat screen panel for crowned deck vibrating shaker | |
| US5615776A (en) | Mounting & tensioning arrangements for screens | |
| US3968033A (en) | Clamping device for screen bottoms | |
| CA1237696A (en) | Vibratory screen separator | |
| US7850011B2 (en) | Screen system | |
| US7942272B2 (en) | Screen system | |
| CA2724749C (en) | Screen assembly designed to conform to the radius of vibrating shakers with crowned decks | |
| CA1304718C (en) | Vibratory screening apparatus | |
| US20060163121A1 (en) | Screen system | |
| CA2389371C (en) | Screen system | |
| US5078873A (en) | Filter cleaning apparatus | |
| US6305549B1 (en) | Vibrating screen assembly of dissimilar materials | |
| ITMI981543A1 (en) | PNEUMATIC BOAT WITH REMOVABLE HULL | |
| GB2175222A (en) | Filtering screen | |
| CA2508300C (en) | Vibratory separator | |
| WO1997047404A1 (en) | Apparatus for attaching filter means to a frame | |
| US3830043A (en) | Clamp device for detachable fastening of a supporting unit, for example a venturi tube unit, for a bag in a bag filter | |
| EP0338836B1 (en) | Device and method for securing tubes in inflatable boats | |
| US5355792A (en) | Two-part frame and pre-tensioning device therefor | |
| US5124037A (en) | Device for filtration of solid element contained within a liquid | |
| NO854614L (en) | RYSTE TERM-DEVICE. | |
| EP0937508B1 (en) | Vibrating screen | |
| KR19990072621A (en) | Cylinder cleaning apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |