JP5505809B2 - Method and device for peeling attached filter cloth in filter cloth traveling type filter press - Google Patents

Description

  The present invention relates to a filter cloth traveling type filter press that treats water sludge, sewage sludge, industrial wastewater sludge, etc., and in particular, when the cake formed between the filter cloths is discharged, the filter is attached to the filter plate. The present invention relates to a cloth peeling method and a peeling apparatus.

Conventionally, filter presses that process a large volume of stock solution reduce the cake discharge time by running a filter cloth suspended between filter plates in order to shorten the filtration cycle time.
A pair of filter cloths are arranged between the filter plates, the upper ends of the filter cloths are connected to the drive chain, and the lower ends of the filter cloths before and after the filter plates are wound around the return roll and connected to the other end of the drive chain. The filter cloth traveling type filter press is known as disclosed in Patent Document 1.

Japanese Patent No. 3815433 (Claims 1, 2 and 4)

The above conventional filter cloth suspending device has an upper filter cloth core in which a pair of filter cloths are disposed between the filter plates, and the filter cloth is fastened to one end of a drive chain wound around a drive wheel above the filter plate. Connect the gold, hang the filter cloth before and after the filter plate around the return roll below the filter plate, connect the lower filter cloth core fixed to the lower end of the filter cloth to the other end of the drive chain, A filter cloth suspended between them can be raised and lowered freely.
In the filter cloth suspending device of Patent Document 1, since the filter cloth being filtered is fastened to the front and rear filter plates and solid-liquid separation is performed by the press-fitting pressure of the stock solution, it is likely to be attached to one filter plate even if it is opened. . In particular, filter cloths that have been sealed on the periphery of the filter plate to prevent seal leaks from the filter cloth, and filter cloths that are provided with a diaphragm for squeezing and dewatering on one side of the filter plate are frequently attached to the filter plate. Occurs.
When the drive wheel is rotated to run the filter cloth downward while the filter cloth is attached to the filter plate, the upper filter cloth core connected to the drive chain is lowered and the lower filter cloth core is raised. The filter cloth does not descend because it adheres to the filter plate, but the filter cloth hung around the return roll below the filter plate is loosened, and the looseness of each part, such as loose filter cloth tension, is the driving wheel at the top of the filter plate. And the drive chain will give you. As a result, the drive chain is loosened and disengaged from the drive wheel, or the drive chain skips.
The present invention prevents the drive chain wound around the drive wheel from being attached to the filter cloth and the filter plate, and prevents the drive chain from coming off from the drive wheel or causing the drive chain to skip. Provided are a method for peeling an attached filter cloth and a peeling device in a cloth traveling type filter press.

  The gist of the present invention is a drive chain in which a pair of filter cloths are arranged between filter plates arranged in parallel so as to be openable and closable, and an upper filter cloth core that suspends the filter cloth is wound around a drive wheel above the filter plate. Connect the lower filter cloth cored bar that wraps the lower edge of the filter cloth around the return roll below the filter plate and secures it to the lower end of the filter cloth, and hangs the filter cloth up and down freely by connecting it to the other end of the drive chain. When the cake generated between the filter cloths is discharged in the filter press, the filter cloth is raised slightly, and after the filter cloth attached to the filter plate is peeled off, the filter cloth is lowered to discharge the cake. It is possible to eliminate the slack and loosening of the drive chain of the drive chain wound around the drive wheel above the filter plate.

In the filter cloth traveling type filter press, the peeling device for carrying out the peeling method of the attached filter cloth has a pair of filter cloths arranged between the filter plates arranged in an openable and closable manner, and the upper filter on which the filter cloth is suspended. The lower filter cloth core is connected to the drive chain that is wound around the upper drive wheel of the filter plate, and the lower edge of the filter cloth is wrapped around the lower return roll of the filter plate and fastened to the lower end of the filter cloth. In a filter press that connects gold to the other end of the drive chain and hangs the filter cloth up and down freely, a peeling detection device is installed above the filter cloth press-fitting start position, and it operates according to the detection signal of the peeling detection device When the filter cloth driving motor is connected and the cake generated between the filter cloths is discharged, the filter cloth is raised, and then the upper filter cloth mandrel for hanging the filter cloth is detected by the peeling detector. Then, reverse the filter cloth drive motor to lower the filter cloth. After peeling the filter cloth to be attached to one of the filter plate was Kaihan, since lowering the filter cloth descending initial troubles filter cloth does not occur.

Specifically, the filter cloth peeling device has a detection stand installed on the front frame, and a detection device for peeling is supported 5 to 100 mm above the detection device that detects the press-fitting start position of the filter cloth on the detection stand. The filter cloth is slightly raised before the cake is discharged, and there is no risk of causing the drive chain to sag or loosen.

The attached filter cloth peeling device in the filter cloth traveling type filter press according to the present invention is configured as described above, and when the cake generated between the filter cloths is discharged, the filter cloth is slightly lifted so that it is opened. After the filter cloth adhering to one filter plate is surely peeled off, the cake can be discharged by lowering the filter cloth.
The slack of the filter cloth is not concentrated in the drive wheel at the top of the filter plate at the initial stage of the cake discharge of the cake discharge, so there is no risk that the drive chain will warp or loosen. The filter cloth adhering to the filter plate can be peeled off without causing trouble such as chain skipping.

It is a schematic side view of the filter press which concerns on this invention. Similarly, it is a principal part top view of the filter cloth drive device of a filter press. Similarly, it is a front view of a filter plate assembly in which a filter cloth is suspended. Similarly, it is a perspective view of a pair of filter cloths suspended between the filter plates. Similarly, it is a principal part side view of the filter press which hangs a pair of filter cloth between filter plates. Similarly, it is the principal part rear view of the front frame which has arrange | positioned the detection apparatus which detects a filter cloth travel stop position. Similarly, it is a side view of the detection device that is disposed on the front frame and extends within the virtual movement range of the filter cloth. Similarly, it is a flowchart from the start to the completion of the peeling process of the cake generated between the filter cloths.

An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic side view of a filter press used in the present invention. The filter press 1 is a pair of guide rails 4 bridged between a front frame 2 and a rear frame 3. , 4 are arranged in parallel with a number of filter plates 5. A movable head 6 is arranged at the end of the parallel filter plates 5... And connected to an open / close cylinder 7 supported on the front frame 2. The filter plate 5 is openable and closable.
FIG. 2 is a plan view of an essential part of the filter cloth drive device of the filter press, in which a filter cloth drive motor 8 capable of forward / reverse rotation is placed on the rear frame 3, and the filter cloth drive motor 8 extending left and right. The drive shaft 9 is supported by the bearing units 10 and 10 and is connected to gear cases 12 and 12 disposed on the supports 11 and 11 at both ends of the rear frame 3.
Slide shafts 13, 13 arranged along both shoulders of the parallel filter plates 5... Are connected to the gear case 12 of the rear frame 3, and the other ends are arranged on the frame 14 of the front frame 2. The unit 15 is pivotally supported.
The filter cloth driving motor 8 is driven to rotate the slide shaft 13 forward and backward.

FIG. 3 is a front view of a filter plate assembly for suspending the filter cloth, and the filter plate arms 16 and 16 of the filter plate 5 are supported on a pair of guide rails 4 and 4 bridged between the front frame 2 and the rear frame 3. A transition link (not shown) that opens at a predetermined interval is connected between the filter plates 5 and 5 so that the filter plate 5 is slidable.
A bevel gear (not shown) is provided in one upper bracket 17 erected on the shoulder of the filter plate 5 on the slide shaft 13 arranged along the upper part of the parallel filter plates 5 shown in FIG. A slide metal 18 is slidably disposed.
The slide metal 18 disposed on the upper bracket 17 of the filter plate 5 is alternately disposed on the left and right filter plates 5 and 5 in parallel.
A filter cloth drive shaft 19 supported on upper brackets 17, 17 erected on both shoulders of the filter plate 5 is linked to the slide shaft 13 via a slide metal 18, and is attached to both ends of the filter cloth drive shaft 19. Drive wheels 20, 20 are fitted.
A pair of return rolls 22, 22 are supported on lower brackets 21, 21 that hang from the lower ends of both ends of the filter plate 5, and a washing water pipe 23 is disposed near the lower side of the return roll 22. A filtration bed 5a is formed at the center of the filter plate 5, and a stock solution supply port 24 is opened at the upper center and a filtrate discharge port 25 is opened at both lower ends.

FIG. 4 is a perspective view of a pair of filter cloths suspended between the filter plates. The filter cloth 26 suspended between the filter plates 5 and 5 has a bag portion 27. .. are formed and bonded, and the upper filter cloth core 28 is inserted. Bag portions 29 and 29 are formed on the lower edges of the filter cloths 26 and 26, respectively, and the lower filter cloth cores 30 and 30 are inserted therethrough. The stock solution supply plate 31 is sandwiched between the pair of filter cloths 26, 26, and the stock solution passage 33 of the stock solution supply plate 31 is fitted into the through hole 32 opened in the upper central portion of the filter fabric 26. A liquid supply path 34 that branches from the raw liquid passage 33 and supplies the raw liquid to the filtration surface of the filter cloth 26 is provided.

FIG. 5 is a side view of a main part of a filter press for suspending a pair of filter cloths between filter plates, and a pair of filter cloths 26, 26 are arranged between the filter plates 5, 5. The drive chain 35 is connected to both ends of the upper filter cloth core 28 on which the filter cloths 26 and 26 are suspended, and is hung around the drive wheel 20 fitted to the filter cloth drive shaft 19 at the upper part of the filter plate 5. . A lower filter inserted through the lower end of the filter cloth 26 by hanging the lower ends of the filter cloths 26, 26 hung around the filter plate 5 around the pair of return rolls 22, 22 arranged below the filter plate 5. Both ends of the cloth cores 30 and 30 are connected to the other ends of the drive chains 35 and 35, and the filter cloths 26 are suspended up and down.

The pair of filter cloths hung between the filter plates shown in FIG. 5 is configured such that when the parallel filter plates 5 are closed, the stock solution supply plate 31 provided between the filter fabrics 26 and 26 is replaced by the front and rear filter plates 5. , 5, and a filtration chamber 36 is formed between a pair of filter cloths 26, 26 suspended from the filter bed 5 a of the filter plate 5. The stock solution passage 33 of the stock solution supply plate 31 is communicated with the stock solution supply port 24 formed in the filter plates 5 and 5, and the stock solution is press-fitted into the filtration chamber 36 from the supply channel 34 of the stock solution supply plate 31, and the filter cloth 26 is filtered. Solid-liquid separation on the surface forms a cake between the filter cloths.
When discharging the cake between the filter cloths, the filter cloth drive motor 8 shown in FIG. 2 is rotated forward to rotate the slide shaft 13, and the filter cloth drive supported on the upper brackets 17, 17 of the shoulder portion of the filter plate 5. A driving force is transmitted to the shaft 19. The filter cloths 26, 26 suspended from the drive chains 35, 35 are rotated by rotating the drive chains 35, 35 wound around the drive wheels 20, 20 fitted to the filter cloth drive shaft 19 at the upper part of the filter plate 5. Lower and drain the cake. Thereafter, the filter cloth driving motor 8 is reversely rotated to raise the filter cloth 26 and return to the front surface of the filter bed 5 a of the filter plate 5.

FIG. 6 is a rear view of the main part of the front frame provided with a detection device for detecting the filter cloth travel stop position. A pair of detection stands 37 and 38 are erected on the front frame 2, and one detection stand is provided. 37, the detection devices LS1 and LS2 for detecting the position where the filter cloth 26 moves up and down are supported. The detection device LS1 detects the upper limit of the filter cloth 26, that is, whether the filter cloth 26 is raised to a predetermined position (press-fit start position) before the filter plate 5 is closed. The detection device LS2 detects the lower limit of the filter cloth 26, that is, whether the filter cloth is lowered to a predetermined position when the cake is discharged.
In addition, the separation detection device LS3 is supported above the detection device LS1 on the other detection frame 38. The peeling detection device LS3 detects an upper limit position where the filter cloth 26 is once lifted in order to surely peel the filter cloth 26 from the filter plate 5 before the filter cloth 26 is lowered.

FIG. 7 is a side view of the detection device arranged on the front frame and extending in the virtual movement range of the filter cloth. In the present embodiment, limit switches LS1 and LS2 are supported as a detection device that detects the position where the filter cloth 26 moves up and down on the detection base 37. When solid-liquid separation is started by closing between the parallel filter plates 5 and 5, the position of the upper filter cloth core 28 where the filter cloths 26 and 26 are suspended is detected, and the filter cloth is in a predetermined position. Judge whether it is rising. Specifically, the limit switch LS1 is extended in the virtual movement range of the filter cloth 26, and the rising limit position is determined by detecting that the upper filter cloth mandrel 28 contacts the limit switch LS1.
The limit switch LS2 detects the position of the lower filter cloth core 30 attached to the lower end of one filter cloth 26 after the cake formed on the filter cloths 26 and 26 is discharged by opening the gap between the filter plates 5 and 5. Then, it is determined whether the filter cloth 26 is lowered to a predetermined position. Specifically, the limit switch LS2 is extended within the virtual movement range of the filter cloth 26, and the lower limit position is determined by detecting that the lower filter cloth core 30 is in contact with the limit switch LS2.

Further, in this embodiment, in order to peel the filter cloth 26 from the filter plate 5, a contact-type limit switch LS3 is supported as a peeling detection device LS3 that detects an ascending limit for temporarily raising the filter cloth 26 from the press-fitting start position. doing. The limit switch LS3 fixed to the detection frame 38 standing on the front frame 2 is supported slightly above the filter cloth travel ascending limit position (filter cloth press-fitting start position). In this embodiment, the limit switch LS3 is installed 5 to 100 mm above the limit switch LS1, but can be appropriately adjusted depending on the stock solution and specifications. The detection bases 37 and 38 are provided with a long hole that can finely adjust the fixing position of the limit switch up and down.
When the cake between the filter plates 5 and 5 is opened and the cake formed between the filter fabrics 26 and 26 is discharged, the filter fabric 26 is once raised upward by 5 to 100 mm. At that time, the filter cloth 26 adhering to one filter plate 5 is peeled off from the filter plate 5 while being pulled upward. The limit switch LS3 detects the position of the upper filter cloth mandrel 28 on which the filter cloths 26 and 26 are suspended, and determines whether the filter cloth is raised to a predetermined position. Specifically, the limit switch LS3 is extended within the virtual movement range of the filter cloth 26, and the rising limit position is determined by detecting that the upper filter cloth mandrel 28 contacts the limit switch LS3. The detection signal of the limit switch LS3 is transmitted to the filter cloth driving motor 8 mounted on the rear frame 3 and capable of forward / reverse rotation, and forward / reverse is switched to lower the filter cloth 26 and discharge the cake.
In addition, you may arrange | position the peeling detection apparatus LS3 in the rear frame 3 or the filter board 5 as needed. In this embodiment, the contact type limit switch is used to detect the position of the filter cloth 26, but a non-contact type proximity sensor may be used.

FIG. 8 is a flowchart from the start to the completion of the peeling process of the cake generated between the filter cloths, and the stock solution for closing the parallel filter plates 5... Shown in FIG. The stock solution is press-fitted into the filtration chamber 36 between the filter cloths 26 and 26 from the supply plate 31 to generate a cake.
A. First, in order to peel the cake produced between the pair of filter cloths 26, 26, the parallel filter plates 5 ... are opened. At that time, the filter cloth 26 is raised to the press-fitting start position.
B. The peeling process of the cake produced | generated between the filter cloths 26 and 26 is started.
C. As a starting condition for the cake peeling process, the cake peeling process is started after confirming that the detection device LS1 is ON.
D. If the detection device LS1 is ON, the peeling process starts, and the filter cloth driving motor 8 is driven in reverse.

E. In order to peel off the filter cloth 26 adhering to the filter plate 5, the filter cloth driving motor 8 is driven in reverse to raise the filter cloth 26 upward by 5 to 100 mm.
F. An upper filter cloth core 28 that suspends the filter cloth 26 pushes up a detection rod of a peeling detection device SL3 disposed slightly above the detection device SL1 to detect contact, and detects the detection signal as a filter cloth driving motor. 8 to send.
G. The filter cloth driving motor 8 starts normal rotation driving according to the detection signal of the peeling detection device SL3. When the filter cloths 26 and 26 are lowered while attached to the filter plates 5 and 5, the looseness of each part such as the looseness of the filter cloth tension is concentrated on the drive wheel 20 on the upper side of the filter plate 5, and the drive chain 35 is bent. There is a possibility that a trouble occurs in which the looseness occurs and the drive wheel 20 comes off or the drive chain 35 skips. However, the filter cloth 26 is lowered after the filter cloth 26 is lifted slightly and the filter cloth 26 attached to the filter plate is surely peeled off, so that the drive chain 35 meshed with the drive wheel 20 is bent. Looseness does not occur.
H. The upper filter cloth mandrel 28 for suspending the filter cloth 26 is in contact with the detection device SL1 for detecting the filter cloth ascent limit position of the filter cloth 26. At this time, regardless of the operation of the detection device LS1, the filter The cloth 26 is lowered.

I. While the filter cloth 26 is lowered, the lower ends of the filter cloths 26 and 26 are raised by U-turning with the return roll 22. When the filter cloth 26 is lowered to the lower limit position for discharging the cake, the lower filter cloth core 30 inserted through the lower edge of the filter cloth 26 pushes up the detection rod of the detection device LS2 to detect contact, and detects the detection signal. Transmit to the cloth driving motor 8.
J. et al. The filter cloth driving motor 8 starts reverse rotation driving according to the detection signal of the detection device LS2.
K. The filter cloths 26 and 26 between the filter plates 5 and 5 are raised by the reverse drive of the filter cloth driving motor 8.
L. An upper filter cloth mandrel 28 that suspends the filter cloth 26 is brought into contact with the detection device LS1 that detects the ascent end position of the filter cloth 26 to push up the detection rod. The filter cloth driving motor 8 is stopped by the detection signal from the detection device LS1. At that time, the filter cloth 26 is raised to the press-fitting start position.
M.M. Complete the cake stripping process. Thereafter, the process proceeds to the closing plate, the stock solution press-fitting, and the dehydration process.

In the filter cloth traveling type filter press according to the present invention, the attached filter cloth peeling device has a peeling detection device disposed on the front frame slightly above the press-fitting start position of the filter cloth, and a detection signal from the peeling detection device. When the filter cloth drive motor is connected and the cake generated between the filter cloths is discharged, the filter cloth is raised slightly and then the filter cloth is lowered so that the filter cloth attached to the filter plate is securely attached. After peeling off, the filter cloth can be lowered to discharge the cake. Looseness of each part, such as looseness of filter cloth tension, is not concentrated on the drive wheel at the top of the filter plate, causing troubles such as the drive chain twisting, there is no risk of loosening, and the drive chain skips. I will not let you.
Therefore, the present invention can be applied to clean water sludge, sewage sludge, industrial wastewater sludge and the like using a filter cloth traveling type filter press.

2 Front frame 3 Rear frame 5 Filter plate 8 Filter cloth driving motor 20 Drive wheel 22 Return roll 26 Filter cloth 28 Upper filter cloth core 30 Lower filter cloth core 35 Drive chain 37, 38 Detection stand LS1, LS2 Detection device (Limit switch)
LS3 Peeling detection device (limit switch)

Claims (3)

  A pair of filter cloths (26, 26) are arranged between the filter plates (5, 5) arranged in parallel to be openable and closable, and the upper filter cloth core (28) for hanging the filter cloth (26, 26) is attached to the filter plate. It is connected to the drive chain (35) wound around the upper drive wheel (20) of (5), and the lower edge of the filter cloth (26) is connected to the return roll (22, 22) below the filter plate (5). A filter in which a lower filter cloth core (30, 30) that is wound around and fastened to the lower end of the filter cloth (26, 26) is connected to the other end of the drive chain (35), and the filter cloth (26) is suspended up and down. In the press, when the cake formed between the filter cloths (26, 26) is discharged, the filter cloth (26) is lifted slightly and the filter cloth (26) adhering to the filter plate (5) is peeled off. Pulling the attached filter cloth in a filter cloth traveling type filter press characterized by lowering the filter cloth (26) and discharging the cake. Peel method. A pair of filter cloths (26, 26) are disposed between the filter plates (5, 5) arranged in parallel to be openable and closable, and the upper filter cloth core (28) for hanging the filter cloth (26, 26) is attached to the filter plate. It is connected to the drive chain (35) wound around the upper drive wheel (20) of (5), and the lower edge of the filter cloth (26) is connected to the return roll (22, 22) below the filter plate (5). A filter in which a lower filter cloth core (30, 30) that is wound around and fastened to the lower end of the filter cloth (26, 26) is connected to the other end of the drive chain (35), and the filter cloth (26) is suspended up and down. In the press, the peeling detection device (LS3) is disposed above the press-fitting start position of the filter cloth (26), and the filter cloth driving motor (8) that is operated by the detection signal of the peeling detection device (LS3) is connected. When the cake formed between the filter cloths (26, 26) is discharged, the filter cloth (26, 26) is once raised. Later, the upper filter cloth core (28) on which the filter cloth (26) is suspended is detected by the peeling detection device (LS3), and the filter cloth drive motor (8) is reversed to lower the filter cloth (26). A filter cloth peeling device in a filter cloth traveling type filter press, characterized in that: A detection stand (38) is erected on the front frame (2), and the detection stand (LS1) for detecting the press-fitting start position of the filter cloth (26) on the detection stand (38) is 5mm to 100mm above for peeling. The apparatus for peeling off the attached filter cloth in the filter cloth traveling type filter press according to claim 2, wherein the detection apparatus (LS3) is supported and the filter cloth (26) is slightly raised before discharging the cake.

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