GB2164865A

GB2164865A - Filter press

Info

Publication number: GB2164865A
Application number: GB08523503A
Authority: GB
Inventors: Oswald Busse
Original assignee: Passavant Werke AG and Co KG
Current assignee: Aqseptence Group GmbH
Priority date: 1984-09-27
Filing date: 1985-09-24
Publication date: 1986-04-03
Also published as: DE8428442U1; GB8523503D0; GB2164865B

Abstract

Each plate of a filter press has an upwardly extending block 7 which is engaged by a pivotable transporter 4 to move each plate in turn. The transporter also pivots a locking hook 8 around pin 10, to unlock the plate being moved from the adjacent plate. Successive plates carry hooks 8 which are relatively staggered, so that each hook can engage the pin 10 of the adjacent plate in the locked position. <IMAGE>

Description

SPECIFICATION Transport and locking apparatus for the plates of filter presses The invention relates to a transport and locking apparatus for the plates of filter presses which plates are suspended slidably on hori frontal guideways and are spaced apart for removal of the filter cake. To ensure that, during the withdrawal of the plates, only the foremost plate is gripped each time and the remaining plates remain on the stack, the plates are locked by locking hooks. In each case, the locking hook of the foremost plate is gripped and unlocked by the hook-shaped driver attached pivotably to the plate transport means.

In a filler press previously known from German Patent Specification 1,288,073, each plate has at its upper end edge a bearing block, the upper end of which is constructed as an abutment for the driver. Each bearing block further comprises a bearing pin for the locking hook which engages the bearing block of the next plate in the locking position. Each locking hok has an upper prolongation situated above the bearing pin, which projects so far beyond the upper end of the bearing block, counter to the sliding direction, that the driver upon dropping in unlocks the locking hook into abutment with the bearing block and then slides the plate.

In the previously known filter press each bearing block has an upper recess, through which the hook-shaped nose of the locking hook engages so as to lock the plate at the foot of the bearing block. The rear end of the locking hook must be constructed as a fork which encloses the bearing block laterally. The upper ends of the fork parts then have the prolongations at which the locking hook is gripped first by the driver.

The bearing block and locking hook are complicated angular precision cast components. They occupy so much space that the gap for the engagement of the driver is extremely narrow. Therefore, it occasionally happens that the driver overrides the locking hook of the last plate without gripping the latter.

According to the invention there is provided a transport and locking apparatus for the plates of filter presses which plates are slidably suspended vertically on horizontal guideways, wherein each plate carries an upwardly projecting bearing block, the upper end of which is constructed as an abutment for a hook-shaped driver attached pivotably to a transport means and which has a bearing pin for a locking hook engaging over the bearing block of the next plate, the upper prolongation of which hook situated above the bearing pin projects counter to the sliding direction of the plates to such an extent beyond the upper end of the bearing block that the driver, upon dropping in, unlocks the locking hook, and wherein the bearing pin has a section which projects laterally from the bearing block and which section is engaged by the locking hook of the previous plate.

The abutment for the locking hook is therefore no longer the foot of the bearing block, but a section of the bearing pin. This results in a construction with substantially better space economy; moreover it has the advantage that the locking hooks are no longer fork-shaped, but can be constructed as flat parts.

The recess can be omitted from the bearing block and according to one embodiment of the invention, the bearing pin may project on both sides of the bearing block. The locking hook of each plate is then arranged alternately on one side and on the other side.

However, it is also possible, as in the previously known filter press, to retain the Ushaped bearing block and to arrange the flat locking hook, the thickness of which corresponds approximately to half the width of the recess in the bearing block, alternatively on the bearing pin.

By way of example, a specific embodiment in accordance with the invention will be described with reference to the accompanying drawings in which: Figure 1 shows three filter press plates with locking hooks in side elevation; and Figure 2 is a vertical cross-section through the rearmost of the three filter plates of Fig.

1.

Of the stack of plates in a filter press, three plates 1, 2, 3 are illustrated, which are required to be withdrawn in this sequence so as to discharge the filter cake. The foremost plate 1 has already been gripped by the driver 4, which is articulated to a transport means (not shown), unlocked and withdrawn to a certain extent. The hook head 5 of the driver 4 has dropped in behind the upper end 6 of the bearing block 7 and has lifted and therefore unlocked the locking hook 8 of this plate 1 from the abutment 9 of the next plate 2 before the sliding commenced. For this purpose, each locking hook 8 has, above the bearing pin 10, a prolongation 12 projecting upwardly and behind the stop surface 11.It may be seen clearly from Fig. 1 that the upper side of the locking hook 8 extends approximately horizontally and beneath the engagement surface of the prolongation 12 along its total length. This is possible because the locking hook now engages over the lowlying bearing pin 10 as an abutment. This results in a large clear gap for the driver to drop in.

Fig. 2 shows that the bearing blocks 7, in the region of their upper end 6, have a recess 13 through which the bearing pin 10 passes.

The locking hooks 8 are mounted alternately on one side and on the other side of this bearing pin 10. A spacing bushing 14 is fitted over the other half which is left clear and serves as an abutment 9 for the locking hook of the previous plate. By an appropriate choice of the external diameter of the spacing bushing, it is possible to determine the horizontal play between the locking hook and the abutment, which is necessary for the breathing of the plates during the pressure relief.

The lower boundary surface of the recess 13 is arranged obliquely so that it can serve as a stop member 15 for both positions of the locking hook 8.

During the sliding of the plate 1 on to the stack of the plates already shifted, the locking hook of this plate, which hook has returned by gravity into the lowr position, is raised by the bearing pin 10 of the arriving plate, namely by means of the oblique surface 16 on the head of the locking hook 8. This head is also bevelled slightly at the side, so that the locking hook, upon entering the recess of the bearing block, is rejected if it is somewhat laterally offset by the play at the bearing pin.

During the sliding of the plate on to the stack, the disengagement of the driver occurs in conventional manner, by the driver being rejected at its lower contact surface 17 by the head of the bearing block. The rejection surface is of such dimensions that the driver is raised fully just before the plate comes into contact. The swing of the shifted plate is sufficient to bring the plate into abutment and effect relocking.

Claims

1. Transport and locking apparatus for the plates of filter presses which plates are slidably suspended vertically on horizontal guideways, wherein each plate carries an upwardly projecting bearing block, the upper end of which is constructed as an abutment for a hook-shaped driver attached pivotably to a transport means and which has a bearing pin for a locking hook engaging over the bearing block of the next plate, the upper prolongation of which hook situated above the bearing pin projects counter to the sliding direction of the plates to such an extent beyond the upper end of the bearing block that the driver, upon dropping in, unlocks the locking hook, and wherein the bearing pin has a section which projects laterally from the bearing block and which section is engaged by the locking hook of the previous plate.

2. Apparatus according to claim 1, wherein the locking hook and the projecting section of the bearing pin are situated alternately on one side and on the other side of the bearing block.

3. Apparatus according to claim 1, wherein the bearing block has at the top in the region of the bearing pin a recess through which the bearing pin extends, and that the locking hook occupies approximately one half of the recess, so that the exposed section of the bearing pin serves as an abutment for the locking hook of the previous plate.

4. Apparatus according to Claim 3, wherein a spacing bushing is fitted over the exposed section of the bearing pin.

5. Apparatus according to Claim 3 or Claim 4, wherein the lower surface of the recess is constructed as an oblique stop member for both positions of the locking hook.

6. Apparatus according to any one of the preceding claims, wherein the tip of the locking hook is bevelled on that side which is closer to the bearing block.

7. Transport and locking apparatus for the plates of filter presses substantially as hereinbefore described with reference to and as shown in the accompanying drawings.