GB2101003A - Filter press plate-separating mechanism - Google Patents
Filter press plate-separating mechanism Download PDFInfo
- Publication number
- GB2101003A GB2101003A GB08119388A GB8119388A GB2101003A GB 2101003 A GB2101003 A GB 2101003A GB 08119388 A GB08119388 A GB 08119388A GB 8119388 A GB8119388 A GB 8119388A GB 2101003 A GB2101003 A GB 2101003A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lever
- pick
- press
- plates
- locking
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
- B01D25/172—Plate spreading means
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
Filter press plates are suspended on side bars or on an overhead rail and moved by a travelling mechanism which moves along the press in reciprocating manner, the movement being reversed in response to excess load on the drive. The or each mechanism comprises a carriage on which are separately pivoted a pick-up lever (1), a stop lever (7) and a locking lever (13), all spring-loaded and levers (1) and (7) having their movements limited by stops (3) and (9). Plates are moved successively to the right by lever (1) whose face (37) abuts the pins (26) of the plates. When the last plate has been moved and the carriage moves left again, fixed cam (22) engages lever (1), tilting it anticlockwise until claw (39) engages in recess (42) of lever (13). The carriage is then able to move rightwards over the pins (26) of the moved plates, until cam (23) engages lobe (44) to pivot lever (13) and release lever (1). <IMAGE>
Description
SPECIFICATION
Improvements in or relating to shifting gear, especially for separating plates in filter presses
The pick up lever is also provided with a second claw to allow it to be engaged with a sunken abutment in the locking lever when the first claw portion of the pick up lever is depressed beyond the point required for the first claw to engage with the lateral plate pin. The locking lever is brought into action by a pin laterally mounted on the press frame such that the pin depresses the first claw of the pick up lever sufficiently to allow the second claw of the pick up lever to pass beyond the sunken abutment face of the locking lever which allows the locking lever to move down under the action of a spring and thus engage with the second claw of the pick up lever to lock up the pick up lever after all filter plates have been shifted.This locking device enables the catch to be reversed in a longitudinal direction with the pick up lever raised clear of the previously shifted plate pins to a parking position at the opposite end of the filter press in preparation for the next plate shifting sequence.
At this parking position, a cam is mounted on the press frame and is so located to engage with a lobe on the locking lever to cause the locking lever to be raised clear of the second claw of the pick up lever and the pick up lever moves down until its lateral abutment face comes into contact with the mating face on the catch casing whereby the pick up lever is now unlocked. All three levers are provided with springs to give quick action movement in a downward direction.
This invention is concerned with gear for separating the filter plates of a filter press when the press is opened.
In the operation of plate type filter presses, it is necessary to open the press after each filtration cycle and to separate the plates individually from the plate pack so as to allowthe removal of fi Iter cake.
What such a system has to do is to engage the end plate of the pack and shift it along the press frame a predetermined distance until it is well separated from the rest of the pack, then engage the next plate of the pack and shift it likewise to abut against a previously shifted plate.
It is an object of this invention to provide an improved mechanism capable of carrying out this operation and to allow it to be employed on either presses supported on sidebars or those suspended from overhead beams or beam. One arrangement in accordance with the invention will now be described by way of an example with reference to the accompanying drawings in which:
Figure 1 is an elevation and end view of the plate separating mechanism according to the invention.
Figure 2 is a series of views 'A' to 'D' of the said
mechanism showing sequential operation.
Figure 3 is a series of views 'E' to 'H' showing
sequential operation.
Figure 4 is an elevation and end view of the mechanism mounted on an overslung type of filter press.
Figure 5 is an elevation and end view of the mechanism mounted on a sidebar type of filter press.
In the drawings, a filter press has plates 25 (Figure 4) onto which are fastened laterally projecting pick up pins 26. The plates are supported on the press beam 31 by means of the suspension assembly 27.
On the underside ofthe press beam or beams is secured a box section longitudinal track member 28 inside which runs the lower stretch 29 of drive chain that extends horizontally along the press frame. The upper stretch 30 of the drive chain runs along the top ofthe press beam 31 or on a longitudinal track secured to the press beam.
The catch assembly 1 to 21 (Figure 1) is connected to the lower chain 29 and travels longitudinally to and fro inside the track member 28. Rollers 32 are mounted onto the catch assembly 1 to 21 to allow free longitudinal movement along the track 28, the upper rollers being to support the catch assembly and the lower rollers being to prevent the catch assembly from excessively lifting off the track 28 when a horizontal load is applied to the pick up lever 1 or the stop lever 7. Fixed stops or cams 22 and 23 (Figure 1) are mounted on the press beam 31 and the plates 25 and pick up pins 26 cooperative with levers 1,7 and 13 of the catch assembly as will hereinafter be explained.
The catch assembly 1 to 21 has a casing consisting of two sideplates 20 and 21 secured to one another in spaced parallel relationship. Between the plates 20 and 21 are mounted a pick up lever 1, a stop lever 7 and a locking lever 13. The pick up lever 1, the stop lever 7 and the locking lever 13 are mounted on indipendent pivots 2, 8 and 14 respectively. Springs 4, 10 and 15 are secured to the levers 1,7 and 13 respectively and the casing sideplates 20 and 21 by means of spring retaining pins 5,6, 11, 12, 16 and 17 respectively. The sideplates 20 and 21 are secured to one another by tie rods 18 and spacers 19.
A pick up lever down stop 3 is mounted and secured to the side plates 20 and 21. The pick up lever 1 is provided with a mating lateral abutment face 33 which in its normal fully down position is in parallel contact with the mating lateral abutment face 34 of the pick up lever down stop 3. Similarly the stop lever down stop 9 is mounted and secured to the side plates 20 and 21 and the stop lever 7 is provided with a mating lateral abutment face 35 which in its
normal fully down position is in parallel contact with the mating lateral abutment face 36 of the stop lever
down stop 9.
The contact of the abutment faces 33 and 34 and
35 and 36 is achieved by the action of the tension springs 4 and 10 respectively.
The pick up lever 1 is provided with a downward
projecting claw portion 37 which when engaging
with a filter plate pick up pin 26 is caused to rotate
about its pivot 2 firstly in an anticlockwise direction
The drawing(s) originally filed were informal and the print here reproduced
is taken from a later filed formal copy.
as the sloping face 38 ofthe claw 37 contacts the pick
up pin 26 and secondly in a clockwise direction as the sloping face 38 rides over the pick up pin 26, both
movements ofthe pick up lever 1 being under the cooperative action of the pick up pins 26 and the pick up lever spring 4.
The pick up lever 1 is also provided with a second claw 39 which is in slideable contact always with a mating face 40 of the locking lever 13 due to the action of the tension spring 15 whilst the pick up lever 1 is depressed by the plate pick up pins 26 and the locking lever 13 will simply rotate firstly clockwise then anticlockwise in sympathy with the rotational movement ofthe pick up lever 1.
However, when the pick up lever 1 is depressed further by the lock cam 22 which is set higher than the filter plate pick up pins 26, the locking lever 13 rotates clockwise by a greater amount than the rotation actioned by the plate pick up pins 26, until the latch surfaces 41 ofthe pick up lever 1 come into contact vertically with the sunken abutment 42 of the locking lever 13 by an anticlockwise movement of the locking lever 13 under the action of a tension spring 15.
The pick up lever 1 is thus prevented from moving in a clockwise direction and is held in this position by the mating abutment faces 41 and 42 and in such a position that the downward projecting claw portion 37 of the pick up lever 1 is well clear of the top surfaces of filter plate pick up pins 26 by a gap 43.
The sideplates 20 and 21 of the catch assembly 1 to 21 are set even higher than the top surfaces of both the lock cam 22 and the plate pick up pins 26 so that contact between these is prevented.
To enable the pick up lever 1 to be unlocked from its upward retained position contained by abutment faces 41 of pick up lever 1 and 42 of the locking lever 13, the locking lever 13 is provided with a lobe 44 on the opposite side of pivot 14 relative to the sunken abutment 42 on the locking lever 13. To effect the unlocking of pick up lever 1 an unlock cam 23 is mounted on the press beam 31 which depresses the lobe 44 and thus rotates the locking lever 13 in a clockwise direction about its pivot 14 which raises the sunken abutment 42 of the locking lever 13 clear of the abutment face 41 of the pick up lever 1 by a gap 45. The pick up lever 1 will now rotate freely in a clockwise direction due to the tension spring 4 until the abutment face 33 of the pick up lever 1 comes into contact with the mating face 34 of the pick up lever down stop 3.
The stop lever 7 has a substantial vertical abutment face 46 which when coming into contact with a filter plate pin 26 in one direction will arrest any further travel in that direction. On reversal of direction, the backward sloping bottom face 47 of the stop lever 7 comes into contact with previously shifted plate pins 26 and rides over them and in doing so simply rotates the stop lever 7 in a clockwise direction about its pivot 8 and against the action of a spring 10.
To prevent excessive lateral movement of the catch assembly the side plates 19 and 20 carry guide strips 48 on their outer faces. The chain 29,30 has an automatically reversing drive that reverses the direction of travel of the chain whenever a chain load in excess of a certain limit is encountered in either longitudinal direction.
The description of the sequential operation of the catch assembly will commence with the catch
assembly in a gap between two separated packs of plates and travelling toward the pack from which plates are to be shifted, one at a time, to join those in the other pack. This is the position shown in Figure 2A. The catch assembly on only one side of the press is referred to but it will be understood that there are two such assemblies one on each side, operating in unison in the cases of overslung presses supported on twin overhead beams and sidebar presses with a sidebar along each side of the press and that there is one such assembly beneath or to one side ofthe press beam in the case of overslung presses supported on single press beams.It will also be understood that a single catch assembly may be mounted on a separate longitudinal member located between the beams of a twin beam overslung press. As the catch assembly reaches the pin 26 on the first plate of the pack to be moved, the sloping leading face 38 of the claw 37 engages the pin causing the pick up lever 1 to be rotated in an anticlockwise direction which in turn causes the locking lever 13 to rotate clockwise against the action of the springs 4 and 15 respectively shown in Figure 2B.
As the catch assembly continues travelling the claw 37 passes over the pin 26 and the levers 1 and 13 return to the initial fully down positions of Figure 2A but with the claw 37 now inserted between the pins 26 of the first and second plates of the pack. The catch assembly continues to travel until the surface 46 of the stop lever 7 strikes the pin 26. This arrests the movement of the catch assembly and produces an overload in the drive chain which will cause reversal of the direction of travel of the catch assembly and consequently the claw 37 picks up pin 26 of the first plate. This is shown in Figures 2C and 2D and the catch assembly now separates the first plate from the pack and moves it towards the plates already moved.
It should be noted at this stage that the claw 37 is prevented from disengaging the pin 26 since the pick up lever 1 cannot rotate away from the pin 26 due to the firm contact between faces 33 ofthe pick up lever 1 and 34 of the pick up lever down stop 3. This is caused by a clockwise moment generated by the pin 26 upon the lever 1. As the catch assembly with the first plate pin 26 held captive reaches the pack of previously moved plates, the sloping back face 47 of the stop lever 7 contacts their pins 26 and the stop lever 7 is depressed against the action of its tension spring 10. The catch assembly continues its travel until the plate being moved is packed firmly against the pack of previously moved plates thus causing an overload in the chain drive which again reverses the direction of travel of the catch assembly as shown in
Figure 3E.
As the catch assembly returns in a direction to pick up the next plate to be moved, the sloping face 47 of the stop lever 7 rides along the top of plate pins 26 whilst the claw 37 of the pick up lever 1 leaves the pin 26 of the plate that has just been moved. As the catch assembly continues its travel the sloping face 47 of the stop lever 7 eventually clears pin 26 of the plate that has just been moved and pulled down by the action of its tension spring 10 until the abutment face 35 of the stop lever 7 comes into parallel contact with the mating abutment face 36 of the stop lever down stop 9. The catch assembly will now be back to the position shown in Figure 2A. The catch assembly will continue through this cycle until all plates are moved.
After moving the last plate, the catch assembly will move in a direction as if to pick up another plate and eventually the sloping face 38 of the pick up lever 1 comes into contact with the lock cam 22. Further movement of the catch in this direction will cause the claw portion 37 of the pick up lever 1 to ride along the top surface 49 of the lock cam 22. Meanwhile, the second claw 39 of the pick up lever 1 rotates anticlockwise and in doing so pushes upward the locking lever 13 via its surface 40. As this anticlockwise rotation ofthe pick up lever 1 continues, the abutment face 41 of the claw portion 39 eventually clears the sunken abutment 42 of the locking lever 13 thus allowing the locking lever 13 to move down under the action of its spring 15.
As the catch assembly continues travelling in this direction, the abutment face 46 of the stop lever 7 strikes the lock cam 22. This arrests the movement of the catch assembly and produces an overload in the drive chain which will cause a reversal of the direction of travel of the catch assembly as shown in
Figure 3F. As the catch assembly continues travelling in this reversed direction, the claw 37 of the pick up lever 1 is drawn clear of the lock cam 22 which will cause the pick up lever 1 to rotate clockwise under the action of its spring 4. The abutment face 41 of the second claw portion 39 will strike the mating abutment face 42 of the locking lever 13 and further clockwise movement of the pick up lever 1 is prevented.
This locking action will result in the first claw 37 of the pick up lever 1 being clear of the tops of all plate pins 26 by a gap 43 shown in Figure 1.
As the catch assembly continues travelling in the reversed direction the sloping surface 47 of the stop lever 7 comes into contact with the pin 26 of the last plate which was previously moved and the stop lever is pushed upward to ride along the top surfaces of the pin 26 and all other pins 26 of the previously moved plates with the pick up lever 1 held captive by the locking lever 13 as shown in Figure 3G. As the catch assembly continues its travel it eventually clears all previously moved plate pins 26 and the stop lever 7 moves down under the action of its spring 10. Further travel of the catch assembly brings the lobe 44 of the locking lever 13 into contact with the unlock cam 23 which is mounted on the press beam 31.As contact between the lobe 44 and the unlock cam 23 continues the lobe 44 of the locking lever 13 is depressed and the locking lever 13 rotates clockwise about its pivot 14. This clockwise rotation causes the sunken abutment 42 of the locking lever 13 to be raised clear of the mating abutment 41 on the claw 39 of the pick up lever 1 by a gap 45. The pick up lever 1 will now be unlocked and will rotate freely clockwise due to the action of its spring 4 until it is arrested by the contact of surfaces 33 on the mating surfaces 34 of the pick up lever down stop 3.
The catch assembly continues its travel until it contacts a limit switch 24 mounted on the press beam 31 which brings the latch assembly to rest until the start of the next filter plate movement cycle as shown in Figure 3H. After the start of the next plate movement cycle, the catch assembly moves foreward and the lobe 44 moves away from the unlock cam 23 allowing the locking lever to rotate anticlockwise until the face 40 of the locking lever 13 comes into contact with the curved surface 50 of the second claw 39 of the pick up lever 1.
All levers are now in their position of readiness for pick up of filter plates in this next cycle as shown in
Figure 2A.
The arrangement described has the following advantages:
1. Positive stacking of the filter plates at both sides of the plate gap.
2. Positive locking and unlocking of the pick up lever.
3. Independence of action of all levers which are spring loaded for quick action and do not rely on gravity for their action. This minimises the risk of "sticking up" in dirty environments.
4. The plate pin cannot come out of captivity between the pick up lever and the stop lever even though the plate may wander occasionally during its shifting movement.
5. The mechanism will accommodate a degree of tolerance with regard to plate pin position.
6. The mechanism will square up misaligned plates before moving them.
7. A jammed catch will simply cause shunting of the chain drive on overload and avoid serious damage.
8. The mechanism will deal with a stray plate or plates in the middle of the plate gap even if the plates are seriously misaligned.
9. The catch design is of slimmer and simpler construction than similar designs of this type and affords a standardised approach to its installation and operation on sidebar and overslung types of filter presses.
Whereas in the foregoing description, two catch assemblies are employed, one on each side of the press and each being supported by a track secured to the underside of each press beam of a twin beamed overslung press, it is also possible to operate with only one single central or offset overhead catch assembly in the case of a single beamed overslung press and a single central overhead catch assembly in the case of a twin beamed overslung press as shown in Figure 4. Furthermore and in the case of a sidebar type of press in which the filter plates are supported on sidebars along each side of the press, the same catch assembly, one on each side will also work in the inverted position as shown in Figure 5.
Claims (12)
1. A shifting mechanism suitable for separating the filter plates of a plate type filter press, wherein a catch mechanism is driven along a track by a drive
means that automatically reverses its direction of travel when loaded beyond a certain limit, the catch
mechanism comprising a pick up lever, a stop lever and a locking lever, each lever being mounted on its own separate pivot, the pick up lever having a first claw portion to engage a pin on the or each member to be moved and a second claw portion with an abutment face which locates with a mating but sunken abutment face of the locking lever when the locking part of the sequence is initiated, and the stop lever having an abutment face that defines with the first claw portion of the pick up lever a gap in which the said pin engaged by the first claw portion lies.
2. Mechanism according to claim 1, wherein both the claw (first) portion of the pick up lever and the stop lever have back faces remote from said gap that are sloped to allow a pin to retract the pick up lever out of the path of the pin in one direction of travel of the catch mechanism and to retract the stop lever out of the path of the pin in the opposite direction of travel.
3. Mechanism according to claim 1 and claim 2 wherein the locking lever is raised by the second portion of the pick up lever to a point to allow locking to be achieved when the first portion of the pick up lever is caused to retract further than usual by means bearing on the pick up lever at a particular position along the track.
4. Mechanism according to claim 3, wherein at another particular position along the track means is provided to trip the locking lever to allow the pick up leverto unlock and return to its down position by the action of its spring.
5. Mechanism according to any one ofthe preceding claims wherein means are provided to prevent the pick up lever and the stop lever from moving downward too far and that the upward movement of the stop lever, the pick up lever and the locking lever is individually resisted by a tension spring separately mounted to each lever and the catch sideplates.
6. Mechanism according to claim 5 wherein the moment caused by the pick up lever spring overcomes always the moment caused by the locking lever spring.
7. Mechanism according to any one of the preceding claims wherein the drive means for the catch mechanism comprises a reversing drive chain extending along the track. The said mechanism substantially described in the text with reference to
Figures 1 to 5 ofthe accompanying drawings.
8. A plate type filter press, inlcuding a shifting mechanism according to any one ofthe preceding claims when the plates are supported by being slung from twin overhead beams and two shifting mechanisms are provided one on each side of the press and each being supported by a longitudinal track secured to the underside of each press beam.
9. A press according to claim 8 when one shifting mechanism is provided extending along the top of the press above the plates.
10. A press including a shifting mechanism according to claims 1 to 7 when the plates are supported by being slung from a single overhead beam and one shifting mechanism is provided and extends along the top of the press above the plates.
11. A press according to claim 10 when one shifting mechanism is provided extending along the top of the press but on an axis eccentric to the vertical centreline ofthe press and above the plates.
12. A press including a mechanism according to claims 1 to 7 wherein the plates are supported on sidebars of the press frame by means of laterallyprojecting pins on the plates and two shifting mechanisms are provided one at each side ofthe press, the track for each catch mechanism extending along the outside of a respective bar with the levers of the catch mechanism cooperating with extensions of the plate supporting pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08119388A GB2101003B (en) | 1981-06-24 | 1981-06-24 | Filter press plate-separating machanism. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08119388A GB2101003B (en) | 1981-06-24 | 1981-06-24 | Filter press plate-separating machanism. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2101003A true GB2101003A (en) | 1983-01-12 |
| GB2101003B GB2101003B (en) | 1985-07-17 |
Family
ID=10522761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08119388A Expired GB2101003B (en) | 1981-06-24 | 1981-06-24 | Filter press plate-separating machanism. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2101003B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4806239A (en) * | 1986-11-28 | 1989-02-21 | Envirotech Corporation | Apparatus for shifting filter plates in a filter press |
| US5006241A (en) * | 1986-11-28 | 1991-04-09 | Envirotech Corporation | Apparatus for shifting filter plates in a filter press |
| EP0453342A1 (en) * | 1990-04-20 | 1991-10-23 | Société L. CHOQUENET (S.A.) | Plate filter-press |
| US5106499A (en) * | 1986-11-28 | 1992-04-21 | Envirotech Corporation | Apparatus for shifting filter plates in a filter press |
| EP0613709A1 (en) * | 1993-03-05 | 1994-09-07 | RITTERSHAUS & BLECHER GMBH | Apparatus for moving the respective front filter plate in filter presses |
| CN117138888A (en) * | 2023-10-31 | 2023-12-01 | 烟台鼎丰生物科技有限公司 | Bean crushing and grinding equipment |
-
1981
- 1981-06-24 GB GB08119388A patent/GB2101003B/en not_active Expired
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4806239A (en) * | 1986-11-28 | 1989-02-21 | Envirotech Corporation | Apparatus for shifting filter plates in a filter press |
| US5006241A (en) * | 1986-11-28 | 1991-04-09 | Envirotech Corporation | Apparatus for shifting filter plates in a filter press |
| US5106499A (en) * | 1986-11-28 | 1992-04-21 | Envirotech Corporation | Apparatus for shifting filter plates in a filter press |
| EP0453342A1 (en) * | 1990-04-20 | 1991-10-23 | Société L. CHOQUENET (S.A.) | Plate filter-press |
| FR2661111A1 (en) * | 1990-04-20 | 1991-10-25 | Choquenet Sa L | IMPROVEMENT OF TRAY PRESS FILTERS. |
| EP0613709A1 (en) * | 1993-03-05 | 1994-09-07 | RITTERSHAUS & BLECHER GMBH | Apparatus for moving the respective front filter plate in filter presses |
| US5480543A (en) * | 1993-03-05 | 1996-01-02 | Rittershaus & Blecher Gmbh | Device on filter presses for moving the filter plate which is the foremost at the time |
| CN117138888A (en) * | 2023-10-31 | 2023-12-01 | 烟台鼎丰生物科技有限公司 | Bean crushing and grinding equipment |
| CN117138888B (en) * | 2023-10-31 | 2023-12-22 | 烟台鼎丰生物科技有限公司 | Bean crushing and grinding equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2101003B (en) | 1985-07-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920624 |