JP5287757B2 - Filter cloth position detection device in filter press - Google Patents

Description

  The present invention relates to an improvement of a filter press that runs a filter cloth and peels a cake, and more particularly relates to a filter cloth position detection device for detecting a running abnormality of the filter cloth.

Conventionally, in the filter press that opens the filter plates arranged in parallel after pressing and lowers the filter cloth to peel the cake, each filter is used as a device for detecting that the filter cloth is in a predetermined position when the filter plate is pressed. A movable member supported by a suitable support device so as to be displaceable and urged to a predetermined standby position (position a to position b) is disposed at a fixed position on the plate. When the operation plates are connected to the filter cloth support bars and the respective filter cloths supported at the upper end positions by the respective filter cloth support bars are brought to the predetermined positions (position a) between the respective filter plates, the respective filter cloths The support bar acts on the operating plate to constitute a see-through sighting device in which the see-through holes of the movable member are brought in a straight line. If there is no abnormality (a) The light of the projector can be detected by the light receiver through the hole, and if there is an abnormality in the filter cloth, the abnormality of the filter is detected because the light of the projector is blocked by the movable member maintained at the position (b). A filter cloth stop position detection device configured as described above is disclosed in Japanese Patent Application Laid-Open No. H10-228707.

  In Patent Document 2, a pair of parallel electrode strips are stretched along the filter plate rows in the upper direction of each filter plate row, and a continuity detecting device between the electrode bands is provided on the pair of electrode strips. Connect the detection levers at the top of each filter plate, and touch the upper surface of the filter cloth support bar at the appropriate position of the detection lever. A detecting unit is provided for interlocking with the vertical movement, and a conductive plate for conducting between the pair of electrode bands is supported by the free end of each detection lever that can move up and down so as to be able to contact with and separate from the two electrode bands. A filter cloth abnormality detection device is disclosed.

Japanese Utility Model Publication No. 57-35375 Japanese Utility Model Publication No. 64-1708

  As shown in FIG. 9A, the detection device that detects the light of the projector with the light receiver is projected by steam, gas, dust, etc. generated from the liquid to be treated or the cleaning water of the filter cloth in the filter press machine. Is blocked or diffused, and there is a problem that malfunction is likely to occur. Therefore, if the light source has a large capacity or a laser beam, power is consumed correspondingly, and there is a problem in terms of safety (influence on the human body).

  Further, as shown in FIG. 9B, the detection device for detecting by conducting between a pair of electrode bands with a conductive plate is due to oxidation of the surface of the conductive plate due to an on-site atmosphere generated in a filter press machine or due to deposits. There has been a problem that detection failure is likely to occur due to the contact failure and the conduction plate not resting on the two electrode bands due to the deflection of the conduction plate or the deflection of the electrode band.

  The present invention provides an improved filter cloth position detection device, and provides a filter cloth position detection apparatus in a filter press capable of highly accurate detection without being influenced by the field atmosphere of the machine.

The gist of the filter cloth position detecting device in the filter press of the present invention is that a filter chamber is formed by a plurality of filter plates arranged in parallel so as to be openable and closable, and a filter cloth suspended between these filter plates. In a filter cloth traveling type filter press that discharges dehydrated cake while lowering the cloth, a support guide is bridged along the row of filter plates, a pressure sensitive switch is attached to the support guide, and a detection lever is installed above the filter plate. The base end is detachably pivoted, and the lifting rod connected to the detection lever is interlocked with the elevation of the upper filter cloth mandrel, and the pressure sensor is pressed with the detection lever.・ The filter cloth position can be detected without being affected by oxidation or deposits due to steam, gas, dust, etc.). Since the pressure-sensitive switch is disposed on the support guide which is a rigid body having sufficient strength, detection failure does not occur due to bending or the like.

The detection lever is pivotably attached to the shoulder of the filter plate, the tip of the detection lever is bent diagonally downward, and a lifting rod formed in an inverted U shape is attached to the middle of the detection lever. A filter cloth cored bar contact part that contacts the upper filter cloth cored bar of the filter cloth and a filter plate contacted part that contacts the top of the filter plate are provided at the tip of the filter cloth, and it is detected when the filter cloth is below the filtration position. When the tip of the lever is brought into contact with the pressure sensitive switch and the filter cloth rises to the filtration position and the upper part of the filter cloth core comes into contact with the filter cloth core metal, the tip of the detection lever is moved from the pressure sensitive switch. The detection lever swings in conjunction with the lifting and lowering of the filter cloth, so that highly accurate detection is possible without being influenced by the on-site atmosphere of the machine.

Since the pressure-sensitive switch is a tape switch, it is a single band and does not require much time for attachment. Further, since the tape switch has a band shape, it can be easily pressed even if the detection lever is shaken.

The filter cloth position detecting device in the filter press according to the present invention is configured as described above, and the pressure sensitive switch is composed of a lower electrode, an upper electrode, an insulating material, and a skin material, and the skin material is made of a soft resin. Therefore, it has a structure in which foreign matter such as moisture and dust is extremely difficult to enter, and it is not affected by oxidation or deposits due to the on-site atmosphere (treatment liquid, steam, gas, dust, etc.) of the machine. Therefore, stable detection can always be performed without being affected by the external environment.
Further, since the pressure-sensitive switch has a band shape, it can be easily pressed even if the detection lever swings.
Furthermore, since the pressure-sensitive switch is disposed on a support guide that is a rigid body having sufficient strength, a detection failure does not occur due to deformation due to sudden impact or bending due to secular change.

It is a schematic side view of the filter press which has the filter cloth position detection apparatus concerning this invention. Similarly, it is a perspective view of the filter cloth hung between the filter plates. Similarly, it is a sectional side view of a suspending device for a filter cloth suspended between filter plates. Similarly, it is a side view of a filter cloth position detection device. Similarly, it is a front view of a filter cloth position detection device. Similarly, it is a principal part enlarged view of a filter cloth position detection apparatus. Similarly, it is a principal part enlarged view of a filter cloth position detection apparatus. Similarly, it is a block diagram of an example of a pressure sensitive switch. Similarly, it is the isometric view schematic which shows the structure of the conventional filter cloth position detection apparatus.

The filter cloth position detecting device in the filter press according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic side view of the filter press having the filter cloth position detecting device. The filter press 1 includes a front frame 2 and a rear frame. A filter chamber 8 is formed by a plurality of filter plates 5 arranged in a freely openable and closable manner on a guide rail 4 bridged to 3 and filter cloths 7 suspended so as to cover the filtration floor surface 6 of these filter plates 5. In addition, a hydraulic cylinder 9 of a filter plate 5 is supported on the rear frame 3. If the filter plate 5 is closed by extending the hydraulic cylinder 9 and pressing the movable head 35 in the direction of the front frame 2, and the stock solution is supplied to the filtration chamber 8 between the closed filter plates 5 and 5, the filtrate It passes through the filter cloth 7 and is discharged outside. The solid matter captured by the filter cloth 7 is dehydrated while forming a cake layer. After dehydration, the hydraulic cylinder 9 is contracted to open the filter plate 5. Then, the filter cloth driving machine 10 is operated so that the dehydrated cake is discharged while the filter cloth 7 is traveling downward.

FIG. 2 is a perspective view of a filter cloth suspended between filter plates, and a pair of rectangular filter cloths 7 are formed by joining upper end portions of each other and then folding back and stitching them together, respectively. And a pair of cylindrical lower end edges 7b which are folded and stitched. An upper filter cloth core bar 11 and a lower filter cloth core bar 12 which are longer than the width of the filter cloth 7 are respectively inserted and fixed to the upper edge 7a and the lower edge 7b. A drive chain 14 having a Tightener bolt 13 at its end is connected to both ends of the upper filter cloth core 11.
An undiluted liquid supply plate 15 is sandwiched between the upper center portions of the pair of filter cloths 7. The liquid supply plate 15 is provided with a raw liquid supply path 16 that penetrates from the front surface to the rear surface, and a liquid supply path 17 that penetrates from the lower inner peripheral surface of the raw liquid supply path 16 to the lower end of the liquid supply plate 15. .

FIG. 3 is a side sectional view of a filter cloth suspending device suspended between filter plates, and a pair of filter cloths 7 are suspended between filter plates 5 arranged in parallel, and the return rolls of the front and rear filter plates 5 respectively. 18 is wound around so that the undiluted filtrate side filtration surface is on the lower side.
The drive chain 14 connected to the upper filter cloth mandrel 11 of the filter cloth 7 is hung on the sprocket 20 of the filter cloth drive shaft 19 of the front filter plate 5 and is hung down to the front side of the filter plate 5. The suspended drive chain 14 is guided by the chain guide roller 20a and the chain guide plate 20b, extends substantially parallel to the sealing surface 5a of the filter plate 5 and the filter bed 6, and is hung on two return rolls 18 below the filter plate 5. It is connected to the lower filter cloth core 12 of the turned filter cloth 7. Here, the lower filter cloth cored bar 12 of each filter cloth 7 is locked to a hanging metal fitting 21 fixed to the titner bolt 13 of the drive chain 14.
When the parallel filter plates 5 are closed, the liquid supply plate 15 fastened to the filter cloth 7 is sandwiched in the recesses 5b of the front and rear filter plates 5, and the pair of filter cloths 7 are filtered by the front and rear filter plates 5. It is stretched on the floor 6 and a filtration chamber 8 is defined between them.
The two return rolls 18 are supported by shifting their positions in the vertical direction. The cleaning tube 22 has a plurality of nozzles 22 a provided below and in parallel to these return rolls 18 and directed to the reversal part of the filter cloth 7 wound around the return roll 18.

The filter cloth 7 on the front side of the pair of filter cloths 7 is wound around the return roll 18 on the rear side of the filter plate 5 in front of the filter cloth 7, and the lower filter cloth core 12 of the filter cloth 7 is filtered. The plate 5 is engaged with a hanging bracket 21 connected to the lower end of the drive chain 14 depending on the front side of the plate 5. Further, the filter cloth 7 on the rear side of the pair of filter cloths 7 suspended in the same manner between the filter plate 5 and the filter plate 5 in the front row is wound around the return roll 18 on the rear side of the filter plate 5, The lower filter cloth core 12 of the filter cloth 7 is locked to the hanging metal fitting 21.
According to the configuration of the hanging metal fitting 21, the filter cloth 7 can be easily suspended and removed from the side of the parallel filter plates 4 as described above, even when the filter cloth 7 is replaced or removed. Can do.

The travel of the filter cloth 7 will be described in detail. After the filter plate 5 is opened, the filter cloth driving machine 10 shown in FIG. 1 is operated to rotate the slide shaft 23. As a result, the filter cloth drive shaft 19 connected to the slide shaft 23 rotates, and the pair of filters shown in FIG. 3 is connected via the sprocket 20 fitted to both ends thereof and the drive chain 14 hung around the sprocket 20. The cloth 7 descends between the opened filter plates 5. At this time, the dewatered cake formed in the filtration chamber 8 descends between the filter plates 5 together with the filter cloth 7, and is peeled off from the filter cloth 7 when the filter cloths 7 are reversed on the return rolls 18.
After the cake is peeled off, the filter cloth 7 is pulled up by the drive chain 14 together with one of the pair of filter cloths 7 constituting the adjacent filter chamber 8, and rises between the filter plates 5. At this time, since the filter cloth 7 is overlapped with the respective filtrate side filtration surfaces facing each other, the filter plate 5 is not contaminated by the remaining cake attached to the filter cloth 7.
Since all the filter cloths 7 between the parallel filter plates 5 and 5 are run simultaneously and the cake between the filter cloths 7 is automatically discharged, the time required for the cake discharging operation is shortened.
When the filter cloth 7 is reversed in the return roll 18, cleaning water is jetted from the cleaning pipe 22 toward the raw solution side filtration surface of the filter cloth 7. Thereby, clogging of the filter cloth 7 can be eliminated. At this time, washing water is sprayed from the nozzle 22a toward the return roll 18. Thereby, the sludge adhering to the return roll 18 can be washed away.
Thus, since it can wash | clean without removing from the filter plate 5, the continuous operation of the filter press 1 is attained, without reducing filtration efficiency.

As shown in FIGS. 4 and 5, the filter cloth position detection device is provided on a support guide 25, which has brackets 24, 24 erected on the front frame 2 and the rear frame 3 and bridged between the brackets 24, 24. The pressure sensitive switch 26 is provided.
One end of a detection lever 27 that presses the pressure-sensitive switch 26 is detachably attached to a mounting plate 28 provided on the shoulder of the upper portion of the filter plate 5, and the other end of the detection lever 27 is centered on the support portion. Swings up and down.
An elevating rod 29 formed by bending a round bar into an inverted U shape is attached to an intermediate portion of the detection lever 27. At both lower ends of the lifting rod 29, a filter cloth cored bar contact part 29a that contacts the upper filter cloth cored bar 11 of the filter cloth 7 and a filter plate contacted part 29b that contacts the top part 5c of the filter plate 5, respectively. Is provided.
The tip 27c of the detection lever 27 is bent downward so that the lower part of the detection lever 27 contacts the pressure-sensitive switch 26 provided on the support guide 25 in a horizontal state from above. In addition, another member for contacting the pressure sensitive switch 26 in a horizontal state may be connected to the detection lever 27. The angle of the pressure sensitive switch 26 is adjusted to adjust the pressure sensitive switch 26 in a tilted state. You may contact.
When the filter cloth 7 is in the upper limit position, the filter cloth cored bar contact portion 29a of the lifting rod 29 contacts the upper filter cloth cored bar 11 and tilts the detection lever 27 upward so that the pressure sensitive switch 26 and Separate. When the filter cloth 7 is lowered, the detection lever 27 is tilted by its own weight while maintaining the contact between the filter cloth core contact portion 29a and the upper filter cloth core 11.
Even when the pressure-sensitive switch 26 is pressed by the tip 27c of the detection lever 27, that is, when the detection lever is tilted downward, the filter plate abutting portion 29b of the lifting / lowering rod 29 is provided with the filter plate 5. The filter plate contact portion 29 b does not contact the filter plate 5 during operation of the filter press 1. When disassembling / assembling the support guide 25 by overhaul or the like, the filter plate abutting portion 29b of the elevating rod 29 is brought into contact with the top portion 5c of the filter plate 5 to prevent the detection lever 27 from being tilted and easily. Work can be done.
4 shows a state where the filter cloth 7 is lowered and the detection lever 27 is in contact with the pressure sensitive switch 26. FIG.

As shown in FIG. 6, a short tube portion 27 a into which a flat plate 28 a attached to the end portion of the attachment plate 28 is inserted is provided at the base end portion of the detection lever 27. A slit 27b that is slightly wider than the thickness of the flat plate 28a and narrower than the width of the flat plate 28a is provided on the side surface of the short tube portion 27a at a position that becomes the lower end when the detection lever 27 is set up vertically. When attaching the detection lever 27 to the mounting plate 28, the detection lever 27 is rotated about the central axis of the short tube portion 27a after passing the flat plate 28a through the slit 27b with the detection lever 27 standing vertically. Since the width of the slit 27b is narrower than the width of the flat plate 28a, the short tube portion 27a does not come off the flat plate 28a unless the detection lever 27 becomes vertical. When the detection lever 27 is removed from the mounting plate 28, the detection lever 27 is rotated to be vertical, and then the flat plate 28a is passed through the slit 27b and pulled out above the detection lever 27.

As shown in FIG. 7, when the filter cloth 7 is lowered, the bent end portion 27c of the detection lever 27 eventually comes into contact with the pressure-sensitive switch 26 provided on the support guide 25 (solid line portion). Thereafter, even if the filter cloth 7 continues to descend, the detection lever 27 is held at the lower limit position with the pressure-sensitive switch 26 pressed by its own weight (two-dot chain line portion).
When the filter cloth 7 rises after the cake is discharged, the filter cloth core abutting portion 29a again comes into contact with the upper filter cloth core 11 of the filter cloth 7 that has been raised, and the detection lever 27 is raised from the lower limit position to the upper limit position.
The elevating rod 29 is formed so as to straddle the upper side of the filter cloth drive shaft 19, and while the detection lever 27 swings between the upper limit position and the lower limit position as the filter cloth 7 moves up and down as described above. It does not interfere with the filter cloth drive shaft 19. Further, when raising the detection lever 27 vertically, the lifting rod 29 does not interfere with the filter cloth drive shaft 19, so that the detection lever 27 can be easily detached when the filter cloth 7 is replaced or inspected.

As described above, when at least one filter cloth 7 does not rise due to the occurrence of any abnormality and the detection lever 27 is in contact with the pressure-sensitive switch 26, the detection signal remains received. . While the detection signal is being received, the operation of the hydraulic cylinder 9 is stopped so that the filter plate 5 is not closed.
Since the occurrence of abnormal running of the filter cloth 7 can be detected before the filter plate 5 is closed, the upper filter cloth core 11 or the lower filter can be obtained by closing the filter plate 5 with some of the filter cloths 7 lowered. Accidents such as the cloth core 12 being sandwiched between the filter plates 5 and 5 can be prevented.

FIG. 8 is a block diagram of an example of a pressure sensitive switch. In this embodiment, a tape switch 30 is used as the pressure sensitive switch 26. The tape switch 30 includes a lower electrode 31, an upper electrode 32, an insulating material 33, and a skin material 34. The tape switch 30 is used by applying a voltage between the lower electrode 31 and the upper electrode 32. Since the outer shell material 34 is made of soft resin, it has a structure in which foreign matter such as moisture and dust is extremely difficult to enter, and oxidation and deposits caused by the on-site atmosphere (treatment liquid, steam, gas, dust, etc.) Not affected. Therefore, stable detection can always be performed without being affected by the external environment.
When the skin material 34 is pressed in the direction of the arrow Z1, the upper electrode 32 is pressed in the direction of the arrow Z1, contacts the lower electrode 31, and a current flows. Thereby, a contact is detected. When the pressing of the outer skin material 34 in the arrow Z1 direction is released, the upper electrode 32 returns to the arrow Z2 direction, the contact with the lower electrode 31 is released, and no current flows.

In this embodiment, since the detection levers 27 are arranged on a large number of parallel filter plates 5, one strip-shaped tape switch 30 is attached on the support guide 25, but moisture or dust is contained inside. There is no problem in use as long as it is a structure that does not easily contain foreign matters such as a mat switch, foot switch, touch pad, etc.
Moreover, you may attach a small piece according to the quantity and installation place of the filter cloth 7, or it divides | segments into several groups.
At the time of attachment, any method such as attachment by an adhesive that does not peel off in the field atmosphere (treatment liquid, vapor, gas, dust, etc.), fixation by a fixing member, or attachment by forming a groove can be selected.

  The filter cloth position detection device in the filter press according to the present invention can perform stable and highly accurate detection at all times without being affected by oxidation or deposits due to the on-site atmosphere (treatment liquid, steam, gas, dust, etc.) of the machine. It can be applied to filter presses for filtration and dehydration of stock solutions in various fields. Moreover, since it is a filter cloth traveling type filter press that can shorten the time required for the cake discharging operation, it is a useful dehydrator that can cope with large capacity and high pressure.

DESCRIPTION OF SYMBOLS 1 Filter press 5 Filter plate 5c Top part 7 Filter cloth 8 Filtration chamber 11 Upper filter cloth core 25 Support guide 26 Pressure sensitive switch 27 Detection lever 27c Tip part 29 Lifting rod 29a Filter cloth core contact part 29b Filter plate contact Part 30 Tape switch

Claims (3)

A filter chamber (8) is formed by a plurality of filter plates (5) arranged in parallel to be openable and closable, and a filter cloth (7) suspended between the filter plates (5, 5). In the filter cloth traveling type filter press (1) for discharging the dewatered cake while lowering (7), the support guide (25) is bridged along the row of the filter plates (5), and the pressure is applied to the support guide (25). A switch (26) is provided, and a base end portion of the detection lever (27) is detachably pivoted on the upper portion of the filter plate (5), and an elevating rod (29) connected to the detection lever (27) is attached to the upper filter. A filter cloth position detecting device in a filter press, wherein the pressure sensing switch (26) is pressed by a detection lever (27) in conjunction with the raising and lowering of the cloth core (11). The detection lever (27) is pivotally attached to the shoulder portion of the filter plate (5) so as to be swingable, the tip end portion (27c) of the detection lever (27) is bent obliquely downward, and an intermediate portion of the detection lever (27). An elevating rod (29) formed in an inverted U-shape is attached to the upper end of the elevating rod (29), and the upper portion of the filter cloth (7) is contacted with the upper filter cloth core (11). (29a) A filter plate contact portion (29b) that contacts the top (5c) of the filter plate (5) is provided, and when the filter cloth (7) is below the filtration position, the tip of the detection lever (27) (27c) is brought into contact with the pressure sensitive switch (26), and the filter cloth (7) is raised to the filtration position, and the filter cloth core metal contact part (29a) contacts the upper filter cloth core metal (11). The filter press according to claim 1, wherein the tip (27c) of the detection lever (27) is separated from the pressure sensitive switch (26). Kicking filter cloth position detecting device. 3. The filter cloth position detecting device in a filter press according to claim 1, wherein the pressure sensitive switch (26) is a tape switch (30).