CA2135728A1 - Face wire installation apparatus - Google Patents
Face wire installation apparatusInfo
- Publication number
- CA2135728A1 CA2135728A1 CA 2135728 CA2135728A CA2135728A1 CA 2135728 A1 CA2135728 A1 CA 2135728A1 CA 2135728 CA2135728 CA 2135728 CA 2135728 A CA2135728 A CA 2135728A CA 2135728 A1 CA2135728 A1 CA 2135728A1
- Authority
- CA
- Canada
- Prior art keywords
- screen
- securing
- skew
- longitudinal
- preventing rotation
- 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.)
- Abandoned
Links
Landscapes
- Combined Means For Separation Of Solids (AREA)
Abstract
A device for securing and preventing rotation and skew of a screen on a filter drum utilizing a rigid longitudinal member embedded in a screen loop and substantially secured within a longitudinal groove within the drum.
Description
FACE WIRE INSTALLATION APPARATUS
BACKGROUND OF THE INVENTION
This invention relates generally to installation of wire screen on porous filter drums and more particularly to a device for securing the screen to the drum and for preventing rotation and skewing of the screen on the drum during operation. The typical use of circumferential bands to secure the screen to the drum allows the screen to "walk" about the drum during operation. This may result in damaged screens and loss of filter capacity.
The foregoing illustrates limitations known to exist in present devices and methods. Thus, it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the limitations set forth above. Accordingly, a suitable alternative is provided including features more fully disclosed hereinafter.
SUMMARY OF THE INVENTION
In one aspect of the present invention this is accomplished by providing an apparatus for securing and preventing rotation and skew of a screen on a filter drum comprising a longitudinal groove on the surface of the drum; a screen disposed circumferentially about the drum;
~135728 a longitudinal member substantially embedded within a loop formed of one end of the screen; and the longitudinal member being secured by a retainer within the longitudinal groove.
The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing figures.
BRIEF DESCRIPTION OF THE DRAWING FIGURES
Fig. 1 is a perspective view of a drum filter as presently known in the art;
Fig. 2 is a perspective view of one method for securing a screen to a filter drum known in the art;
Fig. 3 is a perspective view of one embodiment showing a method for securing a screen retaining device to a filter drum;
Fig. 4 is an end view of the embodiment shown in Fig. 3 in greater detail;
Fig. 5 shows an end view of an alternative attachment detail;
~135728 -Fig. 6 shows an end view of a second alternative attachment detail;
Fig. 7 shows an end view of a third alternative attachment detail;
Fig. 8 shows an end view of a fourth alternative attachment detail; and Fig. 9 shows an end view of a fifth preferred embodiment of an attachment detail according to the present invention.
DETAILED DESCRIPTION
Referring to Fig. 1, a drum filter generally designated by the reference numeral 1, is shown. The drum filter 1 is provided with a cylindrical drum 2 which has its outer peripheral surface encased in a screen 3 as generally practiced in the prior art. The screen 3 is secured to the drum 2 by means of a plurality of circumferential bands or straps 4. In the prior art, the longitudinal seams of the screen were generally overlapped and either wire stitched or welded to secure the joint.
It should be appreciated that during normal operation of the drum filter the drum is rotated through a liquid/particle suspension during which the liquid is drawn into the drum by vacuum, pressure, or other means, the particles being generally collected on the outer surface of the screen for later removal by a scraper (generally referred to as a doctor blade). Friction created between the rotating drum and the liquid/particle media and the doctor blade tend to displace the screen relative to the drum during operation. The screens, therefore, rotate relative to the drum often in a nonuniform manner creating a skewed condition of the screen material. In extreme cases this results in damage to the screens and/or interruption of operation due to the skewed screen interfering with the mechanical rotation of the drum by dragging on frame members or the like. As previously stated, the banding method does not prevent twisting of the face wire or screen. The method of installation is also expensive and time-consuming.
One known method of minimizing the relative rotation of the screen is shown in Fig. 2, wherein a loop 3'' is formed in one end of the screen about a piece of pipe 10 which is positioned adjacent to a rib or grid 7 on the drum surface 8. The screen is then stretched around the drum and the other end of the screen 3' is overlapped over the screen portion containing the loop and either stitched or welded in place.
~135728 The pipe and loop method may create a protrusion if used without a further means of securing the pipe. The protrusion may catch on the take-off doctor and thereby cause damage to the wire or the machine.
According to the present invention, one method of securing the screen loop and pipe is shown in Figs. 3 and 4 wherein a hook 15 is secured to the rib or grid 7 which grips a rod 10 inserted in the loop 3 through a series of cutouts 9 in the screen loop provided along the length of the rod. The hooks securely hold the rod lo and the encircling loop of screen 3' at a position substantially away from the face of the drum thereby minimizing the possibility of surface interference.
The compartment formed between the grids 7 and 7', as seen in Fig. 4, provides an area of unsupported face screen or wire 3 and the support of the rod by the hooks is noncontinuous. Accordingly in a first preferred embodiment of the present invention, as shown in Fig. 5, a tapered locking channel is formed between a deck support 16 in a C-formed locking channel 18. The longitudinal channel 30 is open to the top deck through the screen access opening 35. The grid top hat 16 snaps over the grid 7 which in turn is supported from the drum 8 and further reinforced by the diagonal brace 27, best seen in Fig. 5.
The deck members 28 and 28' are supported on the top hat 16 and secured there in part by the cap strip 17 and the C-formed locking channel 18. A spacer 29 compensates for the C-formed locking channel height so that the deck members 28 and 28' line up. The screen wire 3 passes over the cap strip 17 and is formed into the locking channel 30 and then up over the C-formed locking channel 18. A trapezoidal cross section locking key 20 is then inserted lengthwise from one end into the complimentary trapezoidal locking form of the locking channel 30 from one end.
An installation tool 21, which cooperates with a bore 22 in the trapezoidal key 20, assists in the longitudinal insertion. Once the key is in place the installation tool is removed. The complimentary trapezoidal forms create a key lock with regard to the screen wire 3 which prevents its rotation uniformly end to end on the drum. To remove the screen the locking key is withdrawn axially in a manner similar to its insertion. The screen may then be removed from the locking channel as required.
Fig. 6 shows an alternative key in the form of a circular cross section key 20'. The key is inserted and performs in a manner similar to that described for the Fig. 5 embodiment.
Fig. 7 shows a third alternative embodiment wherein a pair of circular cross sectional rods 20b and 20c are inserted in screen loops 3'' and 3''' thereby securing both ends of the screen 3 and 3' within the same locking channel 30. To facilitate tensioning and overlap welding, a stub piece of screen 31 is provided in conjunction with the end 3', as shown in Fig. 7.
Fig. 8 shows a fourth alternative embodiment wherein the loop 3'' is formed over a pipe or rod keeper 20' and wherein the end of the screen 3' is carried over the locking channel to be secured to the screen wire 3.
Fig. 9 shows a fifth preferred embodiment of the present invention wherein the screen loop 3' and the longitudinal insert securing member 20d are retained within parallel adjacent grids 7 and 7' by a modified top hat member 16' having one leg 22 bent down at approximately 45 degree angle to form a displaceable flexible nip which grabs the screen loop 3' and longitudinal retainer insert 2Od when it is forced down between the nip point and grid 7' on installation.
A modified top hat 26 and cap strip 17b provides support for the deck 28'. The top hat 16' and cap strip 17a provides support for the deck portion 28. As in embodiments above, the end 3' of the screening wire is carried over the screen 3 and secured by stitching or welding the wire together as previously described.
Removal of the screen is rapidly accomplished by simply cutting the portion of the screening wire inserted in the nip between the leg 22 and grid 7' and allowing it to drop into the gap between the grids 7 and 7' upon installation of a new screen.
It should be appreciated that this embodiment provides a very simple and fast means for securely fastening the screening wire to the deck of the filter drum. Other similar means of securing the screen end may now occur to one skilled in the art.
BACKGROUND OF THE INVENTION
This invention relates generally to installation of wire screen on porous filter drums and more particularly to a device for securing the screen to the drum and for preventing rotation and skewing of the screen on the drum during operation. The typical use of circumferential bands to secure the screen to the drum allows the screen to "walk" about the drum during operation. This may result in damaged screens and loss of filter capacity.
The foregoing illustrates limitations known to exist in present devices and methods. Thus, it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the limitations set forth above. Accordingly, a suitable alternative is provided including features more fully disclosed hereinafter.
SUMMARY OF THE INVENTION
In one aspect of the present invention this is accomplished by providing an apparatus for securing and preventing rotation and skew of a screen on a filter drum comprising a longitudinal groove on the surface of the drum; a screen disposed circumferentially about the drum;
~135728 a longitudinal member substantially embedded within a loop formed of one end of the screen; and the longitudinal member being secured by a retainer within the longitudinal groove.
The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing figures.
BRIEF DESCRIPTION OF THE DRAWING FIGURES
Fig. 1 is a perspective view of a drum filter as presently known in the art;
Fig. 2 is a perspective view of one method for securing a screen to a filter drum known in the art;
Fig. 3 is a perspective view of one embodiment showing a method for securing a screen retaining device to a filter drum;
Fig. 4 is an end view of the embodiment shown in Fig. 3 in greater detail;
Fig. 5 shows an end view of an alternative attachment detail;
~135728 -Fig. 6 shows an end view of a second alternative attachment detail;
Fig. 7 shows an end view of a third alternative attachment detail;
Fig. 8 shows an end view of a fourth alternative attachment detail; and Fig. 9 shows an end view of a fifth preferred embodiment of an attachment detail according to the present invention.
DETAILED DESCRIPTION
Referring to Fig. 1, a drum filter generally designated by the reference numeral 1, is shown. The drum filter 1 is provided with a cylindrical drum 2 which has its outer peripheral surface encased in a screen 3 as generally practiced in the prior art. The screen 3 is secured to the drum 2 by means of a plurality of circumferential bands or straps 4. In the prior art, the longitudinal seams of the screen were generally overlapped and either wire stitched or welded to secure the joint.
It should be appreciated that during normal operation of the drum filter the drum is rotated through a liquid/particle suspension during which the liquid is drawn into the drum by vacuum, pressure, or other means, the particles being generally collected on the outer surface of the screen for later removal by a scraper (generally referred to as a doctor blade). Friction created between the rotating drum and the liquid/particle media and the doctor blade tend to displace the screen relative to the drum during operation. The screens, therefore, rotate relative to the drum often in a nonuniform manner creating a skewed condition of the screen material. In extreme cases this results in damage to the screens and/or interruption of operation due to the skewed screen interfering with the mechanical rotation of the drum by dragging on frame members or the like. As previously stated, the banding method does not prevent twisting of the face wire or screen. The method of installation is also expensive and time-consuming.
One known method of minimizing the relative rotation of the screen is shown in Fig. 2, wherein a loop 3'' is formed in one end of the screen about a piece of pipe 10 which is positioned adjacent to a rib or grid 7 on the drum surface 8. The screen is then stretched around the drum and the other end of the screen 3' is overlapped over the screen portion containing the loop and either stitched or welded in place.
~135728 The pipe and loop method may create a protrusion if used without a further means of securing the pipe. The protrusion may catch on the take-off doctor and thereby cause damage to the wire or the machine.
According to the present invention, one method of securing the screen loop and pipe is shown in Figs. 3 and 4 wherein a hook 15 is secured to the rib or grid 7 which grips a rod 10 inserted in the loop 3 through a series of cutouts 9 in the screen loop provided along the length of the rod. The hooks securely hold the rod lo and the encircling loop of screen 3' at a position substantially away from the face of the drum thereby minimizing the possibility of surface interference.
The compartment formed between the grids 7 and 7', as seen in Fig. 4, provides an area of unsupported face screen or wire 3 and the support of the rod by the hooks is noncontinuous. Accordingly in a first preferred embodiment of the present invention, as shown in Fig. 5, a tapered locking channel is formed between a deck support 16 in a C-formed locking channel 18. The longitudinal channel 30 is open to the top deck through the screen access opening 35. The grid top hat 16 snaps over the grid 7 which in turn is supported from the drum 8 and further reinforced by the diagonal brace 27, best seen in Fig. 5.
The deck members 28 and 28' are supported on the top hat 16 and secured there in part by the cap strip 17 and the C-formed locking channel 18. A spacer 29 compensates for the C-formed locking channel height so that the deck members 28 and 28' line up. The screen wire 3 passes over the cap strip 17 and is formed into the locking channel 30 and then up over the C-formed locking channel 18. A trapezoidal cross section locking key 20 is then inserted lengthwise from one end into the complimentary trapezoidal locking form of the locking channel 30 from one end.
An installation tool 21, which cooperates with a bore 22 in the trapezoidal key 20, assists in the longitudinal insertion. Once the key is in place the installation tool is removed. The complimentary trapezoidal forms create a key lock with regard to the screen wire 3 which prevents its rotation uniformly end to end on the drum. To remove the screen the locking key is withdrawn axially in a manner similar to its insertion. The screen may then be removed from the locking channel as required.
Fig. 6 shows an alternative key in the form of a circular cross section key 20'. The key is inserted and performs in a manner similar to that described for the Fig. 5 embodiment.
Fig. 7 shows a third alternative embodiment wherein a pair of circular cross sectional rods 20b and 20c are inserted in screen loops 3'' and 3''' thereby securing both ends of the screen 3 and 3' within the same locking channel 30. To facilitate tensioning and overlap welding, a stub piece of screen 31 is provided in conjunction with the end 3', as shown in Fig. 7.
Fig. 8 shows a fourth alternative embodiment wherein the loop 3'' is formed over a pipe or rod keeper 20' and wherein the end of the screen 3' is carried over the locking channel to be secured to the screen wire 3.
Fig. 9 shows a fifth preferred embodiment of the present invention wherein the screen loop 3' and the longitudinal insert securing member 20d are retained within parallel adjacent grids 7 and 7' by a modified top hat member 16' having one leg 22 bent down at approximately 45 degree angle to form a displaceable flexible nip which grabs the screen loop 3' and longitudinal retainer insert 2Od when it is forced down between the nip point and grid 7' on installation.
A modified top hat 26 and cap strip 17b provides support for the deck 28'. The top hat 16' and cap strip 17a provides support for the deck portion 28. As in embodiments above, the end 3' of the screening wire is carried over the screen 3 and secured by stitching or welding the wire together as previously described.
Removal of the screen is rapidly accomplished by simply cutting the portion of the screening wire inserted in the nip between the leg 22 and grid 7' and allowing it to drop into the gap between the grids 7 and 7' upon installation of a new screen.
It should be appreciated that this embodiment provides a very simple and fast means for securely fastening the screening wire to the deck of the filter drum. Other similar means of securing the screen end may now occur to one skilled in the art.
Claims (12)
1. An apparatus for securing and preventing rotation and skew of a screen on a filter drum comprising:
a longitudinal groove on the surface of said drum;
a screen disposed circumferentially about said drum;
a longitudinal member substantially embedded within a loop formed of one end of said screen; and said longitudinal member being secured by a retainer within said longitudinal groove.
a longitudinal groove on the surface of said drum;
a screen disposed circumferentially about said drum;
a longitudinal member substantially embedded within a loop formed of one end of said screen; and said longitudinal member being secured by a retainer within said longitudinal groove.
2. An apparatus for securing and preventing rotation and skew of a screen on a filter drum according to claim 1, wherein: said retainer further comprises a hook within said longitudinal groove.
3. An apparatus for securing and preventing rotation and skew of a screen on a filter drum according to claim 1, wherein: said longitudinal groove is formed between two adjacent longitudinal grid ribs.
4. An apparatus for securing and preventing rotation and skew of a screen on a filter drum according to claim 1, wherein: said longitudinal groove on the surface of said filter drum is formed within a grid cap secured to a grid member which in turn is secured to a deck member of said porous drum.
5. An apparatus for securing and preventing rotation and skew of a screen on a filter drum according to claim 4, wherein: said screen is disposed within said longitudinal groove and secured therein by a keeper key.
6. An apparatus for securing and preventing rotation and skew of a screen on a filter drum according to claim 5, wherein: said keeper key is in the form of a trapezoid and said longitudinal groove is in the form of a complimentary trapezoid of larger dimension to accept said keeper key.
7. An apparatus for securing and preventing rotation and skew of a screen on a filter drum according to claim 5, wherein: said keeper key is inserted longitudinally into said groove within a loop formed in said screen, said keeper key having a cross section of larger dimension than a longitudinal opening of said longitudinal groove extending to the surface of said drum.
8. An apparatus for securing and preventing rotation and skew of a screen on a filter drum according to claim 7, wherein: said keeper key is circular in form.
9. An apparatus for securing and preventing rotation and skew of a screen on a filter drum according to claim 7, wherein: a loop is formed in each end of said screen and said screen is retained within said longitudinal groove by a keeper key in each of said loops installed within said longitudinal groove, the combination of cross sectional diameters of said keepers being greater than the longitudinal opening of said longitudinal groove.
10. An apparatus for securing and preventing rotation and skew of a screen on a filter drum according to claim 7, wherein: said keeper key is an expansible member capable of passing through said longitudinal opening to said groove with said screen loop and thereafter being expanded to a diameter which is greater in combination with said screen loop than the longitudinal opening.
11. An apparatus for securing and preventing rotation and skew of a screen on a filter drum according to claim 1, wherein: said longitudinal groove is provided with a means for capturing said longitudinal member and said screen within said groove.
12. An apparatus for securing and preventing rotation and skew of a screen on a filter drum according to claim 11, wherein: said means for capturing said longitudinal member embedded within said loop further comprises a flexible spring member formed on one end of a grid top hat member producing a nip point between two adjacent grid members.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15975293A | 1993-11-30 | 1993-11-30 | |
| US08/159,752 | 1993-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2135728A1 true CA2135728A1 (en) | 1995-05-31 |
Family
ID=22573862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2135728 Abandoned CA2135728A1 (en) | 1993-11-30 | 1994-11-14 | Face wire installation apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2135728A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016141453A1 (en) * | 2015-03-11 | 2016-09-15 | Gl&V Luxembourg S.Á.R.L. | A method of constructing a rotary drum filtering apparatus |
| US11633681B2 (en) | 2019-02-05 | 2023-04-25 | Andritz Inc. | Replaceable filter plate assembly for a rotary drum filter |
-
1994
- 1994-11-14 CA CA 2135728 patent/CA2135728A1/en not_active Abandoned
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016141453A1 (en) * | 2015-03-11 | 2016-09-15 | Gl&V Luxembourg S.Á.R.L. | A method of constructing a rotary drum filtering apparatus |
| US20160263501A1 (en) * | 2015-03-11 | 2016-09-15 | GL&V Luxembourg S.à.r.l. | Method of constructing a rotary drum filtering apparatus |
| US9669337B2 (en) * | 2015-03-11 | 2017-06-06 | GL&V Luxembourg Sàrl | Method of constructing a rotary drum filtering apparatus |
| CN107847828A (en) * | 2015-03-11 | 2018-03-27 | Gl&V卢森堡公司 | The method for constructing rotary drum filtration equipment |
| EP3268105A4 (en) * | 2015-03-11 | 2019-06-12 | GL&V Luxembourg S.a.r.l. | A method of constructing a rotary drum filtering apparatus |
| CN107847828B (en) * | 2015-03-11 | 2020-03-17 | Gl&V卢森堡公司 | Method for constructing rotary drum filter device |
| US11633681B2 (en) | 2019-02-05 | 2023-04-25 | Andritz Inc. | Replaceable filter plate assembly for a rotary drum filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |