JP2014000488A - Filter plate switchgear in filter press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter plate switchgear in a filter press for always keeping central parts of parallel-connected filter plates at constant positions, at the time of expanding and contracting hydraulic cylinders for opening and closing the parallel-connected filter plates.SOLUTION: In a filter press 1 that allows many parallel-connected filter plates 5 to be freely opened or closed by coupling a rear end of a cylinder tube 10 of each hydraulic cylinder 9 and a tip end of each piston rod 11 to movable heads 7 and 8 provided on both ends of the parallel-connected filter plates 5, respectively, a filter plate switchgear includes: a direction adjuster (rod pulley) 14 provided on each guide rail 4; and a driving band (rope) 15 coupled to an appropriate portion of the cylinder tube 10 of the hydraulic cylinder 9 and the tip end of the piston rod 11, the driving band (rope) 15 being wound around the rod pulley 14. Therefore, the filter plate switchgear can always keep central parts of the parallel-connected filter plates 5 at constant positions, at the time of expanding and contracting the hydraulic cylinders 9 for opening and closing the parallel-connected filter plates 5.

Description

  The present invention relates to an opening / closing device for a filter plate of a filter press that treats sewage sludge, sewage sludge, industrial wastewater sludge, and the like, and more particularly, to an opening / closing device that uses hydraulic cylinders arranged side by side along guide rails.

Conventionally, a filter press that opens and closes a large number of filter plates by connecting a hydraulic cylinder to the frame that supports the guide rail and connecting the piston rod of the hydraulic cylinder to a movable head provided at the side end of the filter plate in parallel is known. It is known. In addition, as a means to close and close a large number of filter plates at high speed, endless chains stretched between frames are connected to movable heads (movable heads) disposed at both ends of the parallel filter plates, and the end portions of the parallel filter plates are connected to both ends. A fastening device that fastens a large number of filter plates with an endless chain and then contracts the hydraulic cylinders to fasten a large number of filter plates after fastening a connecting rod having a hydraulic cylinder to a pair of movable heads disposed. Patent Document 1 proposes the applicant of the present invention. A filter press in which a filter plate (filter plate) assembly having pressure plates at both ends is supported on a frame (guide rail) and a splint 12 having a drive device at one end is connected to the pressure plates at both ends is a patent. This is disclosed in Document 2.

Japanese Patent Laid-Open No. 3-118806 (Claim 3 and FIG. 1) Japanese Patent Publication No. 2-23204 (Summary of Invention, FIG. 1)

2. Description of the Related Art Conventionally, a filter press that connects a member having a hydraulic cylinder to movable heads disposed at both ends of a parallel filter plate and opens and closes a large number of filter plates is known.
The opening and closing device for the filter plate of Patent Document 1 enables high-speed closing of the parallel filter plates with an endless chain stretched between the frames, and shortens the miscellaneous time, but because the opening and closing plates of the filter plate are performed with the endless chain. It is necessary to use a strength member for the endless chain and the power transmission unit. Further, since the endless chain is hung between the frames, the length of the filter press needs to be about the same as the entire length of the filter press.
In the filter press shown in Patent Document 2, a splint (connecting rod) provided with a driving device (hydraulic cylinder) is set to a length substantially equal to the opening / closing strokes of a large number of filter plates, and the intermediate portions of the large number of filter plates are bounded. As a result, a drive device that moves left and right is not a solution to the risk of exceeding the allowable speed of the left and right filter plates when opening and closing. If one of the parallel filter plates is fixed, the opening / closing speed is doubled.
This invention solves the problem that when the parallel filter plates are opened and closed, the filter plate cannot stop at a predetermined position due to the difference in sliding frictional resistance (load). Provided is a filter plate opening / closing device in a filter press in which a position (a central portion of a parallel filter plate) always maintains a fixed position.

  The filter plate opening and closing device in the filter press according to the present invention has a large number of filter plates arranged in parallel on a pair of guide rails bridged between the front frame and the rear frame, and movable heads are disposed at both ends of the parallel filter plates, In a filter press that connects the rear end of cylinder tubes of multiple hydraulic cylinders to one movable head and the tip of the piston rod to the other movable head to open and close a number of filter plates, guide rails A directional adjuster is installed on the drive tube connected to the appropriate position of the cylinder tube of the hydraulic cylinder and the tip of the piston rod. The sliding friction resistance is applied when opening and closing the parallel filter plates. Solves the problem that the filter plate cannot stop at the specified position due to the difference in (load). Heart position can be maintained always constant position (the central portion of the parallel filter plate).

If the directional adjuster that hangs around the drive belt is installed in two upper and lower stages at the appropriate position on the guide rail, the inclination angle of the drive lane that hangs around the directional adjuster and the hydraulic cylinder can be approximated to zero and connected to the hydraulic cylinder. The resistance of the driving band to be reduced is reduced.
Specifically, the directional adjuster is constituted by a pulley or a sprocket, and a driving band that hangs around the pulley or the sprocket is a belt or a chain.
And even if it arrange | positions a direction adjuster in a front frame or a rear frame, the inclination-angle of the drive belt hung around a direction adjuster can be approximated to zero.

The filter plate opening and closing device in the filter press according to the present invention is configured as described above, and when opening and closing a large number of filter plates from side to side, due to the difference in sliding frictional resistance (load) of the filter plate supported on the guide rail. Solves the problem that the parallel filter plates are not concentrated in place and the stop position cannot be fixed, and the center position of the hydraulic cylinder that expands and contracts with respect to the front and rear frames is always kept at a fixed position, and a number of filter plates are It becomes the filter plate opening and closing device in the filter press that opens and closes to the position.

It is a side view at the time of the filter plate closing of the opening / closing apparatus of the filter press which concerns on this invention. Similarly, it is a side view at the time of opening the filter plate of the switchgear. It is the front view of the filter press seen from the front frame side along the AA line of FIG. It is the schematic of the opening / closing apparatus of the filter press shown to FIG. 1, FIG. It is the schematic of the opening / closing apparatus of the filter press of another Example similarly. It is the schematic of the opening / closing apparatus of the filter press of another Example similarly. It is a front view of the filter board assembly supported on the guide rail of a filter press and opened and closed. Similarly, it is a front view of a filter cloth. Similarly, it is the principal part side view of the filter board which suspended the filter cloth. It is a conceptual diagram of the central point of the hydraulic cylinder and filter press of the opening and closing device of the filter press according to the present invention. Similarly, it is a conceptual diagram of the center point of the hydraulic cylinder and the filter press when the piston rod is extended. Similarly, it is a conceptual diagram of the central point of the hydraulic cylinder and the filter press when the piston rod is contracted. Similarly, it is an image diagram for fixing the center position of the hydraulic cylinder (the center position of the parallel filter plates) in the process of extending the piston rod of the hydraulic cylinder. Similarly, it is an image figure of the center position of the hydraulic cylinder in the extension process of the piston rod of the hydraulic cylinder. Similarly, it is a setting condition for a deviation prevention measure. Similarly, it is a conceptual diagram at the time of extension of the piston rod of the hydraulic cylinder.

An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of the filter press opening and closing device according to the present invention when the filter plate is closed, and FIG. 2 is a side view of the parallel filter plate when opened. is there. As shown in FIGS. 1 and 2, a large number of filter plates 5 are arranged in parallel on a pair of guide rails 4, 4 bridged by a front frame 2 and a rear frame 3. A pair of movable heads 7 and 8 are disposed at both ends of the parallel filter plates 5... And the plurality of filter plates 5 and the movable heads 7 and 8 are connected to each other by a chain (not shown). It is possible to open the plates 5 at predetermined intervals. The hydraulic cylinders 9 are arranged symmetrically along the upper and lower surfaces of the guide rail 4, and the rear end portion of the cylinder tube 10 of the upper hydraulic cylinder 9 is connected to one movable head 7 by a connecting rod 12. The tip of the piston rod 11 is connected to the other movable head 8 by a connecting rod 13. Further, the rear end portion of the cylinder tube 10 of the lower hydraulic cylinder 9 is connected to one movable head 8 by a connecting rod 12, and the tip end of the piston rod 11 is connected to the other movable head 7 by a connecting rod 13. The opening and closing plate positions of the movable heads 7 and 8 at both ends are constrained. The hydraulic cylinder 9 sets the total length when the piston rod 11 is contracted to the distance between the left and right movable heads 7 and 8 when the parallel filter plates 5 are closed, and the total length when the piston rod 11 is extended is set as the parallel filter plate. The distance between the left and right movable heads 7 and 8 when the plate is opened is 5. If the piston rod 11 of the hydraulic cylinder 9 is expanded and contracted, the parallel filter plates 5 can be opened and closed. If necessary, an intermediate stand for supporting the guide rail 4 may be erected at the center of the parallel filter plates 5.

3 is a front view of the filter press as viewed from the front frame side along the line AA in FIG. 1. The four hydraulic cylinders 9 for opening and closing the parallel filter plates 5 are the upper and lower sides of the intermediate stand 6. It is arranged along the vicinity.

4A and 4B are schematic views of the opening and closing device of the filter press, in which FIG. 4A shows an operation state when the plate is closed, and FIG. 4B shows an operation state when the plate is opened. A pair of pulley direction adjusters 14, 14 are juxtaposed in two upper and lower stages on the upper surface of the guide rail 4 in the vicinity of the rear frame 3, and one end of a rope drive belt 15 hung around the direction adjusters 14, 14 is provided. The end of the cylinder tube 10 of the hydraulic cylinder 9 is connected to a locking rod 16 and the other end of the drive band 15 is connected to the end of the piston rod 11.
Further, if the direction adjusters 14 and 14 are arranged in two upper and lower stages like the hydraulic cylinders 9 arranged side by side along the lower surface of the guide rail 4, the inclination of the drive band 15 that hangs around the direction adjusters 14 and 14. The angle can be approximated to zero.

FIG. 5 is a schematic view of an opening / closing device for a filter press according to another embodiment, and FIG. Direction adjusters 14, 14 for driving the drive belt 15 are arranged on the guide rail 4 on the front frame 2 side. A driving belt 15 connected to a locking rod 17 disposed at the rear end of the cylinder tube 10 of the hydraulic cylinder 9 and a locking rod 18 disposed at the tip of the piston rod 11 is hung around the direction adjusters 14 and 14. It is. The rear end of the cylinder tube 10 of the hydraulic cylinder 9 and the tip of the piston rod 11 are connected to the movable heads 7, 8 at both ends of the parallel filter plates 5 ..., and the center point P of the hydraulic cylinder is the filter press. It becomes the center point. If the total length of the hydraulic cylinder 9 when contracted is LO, the distance from the center point P of the hydraulic cylinder 9 to the rear end of the cylinder tube 10 and the tip of the piston rod 11 is LO / 2. If the distance from the locking rod 17 at the rear end of the cylinder tube 10 to the direction adjuster 14 is S, the distance from the locking rod 18 at the tip of the piston rod 11 to the direction adjuster 14 is LO + S, and the hydraulic cylinder The distance from the center point P of 9 to the direction adjuster 14 is S + LO / 2.

FIG. 5 (b) shows the operating situation when the plate is opened. Disclosed is a measure for preventing a shift between the center point P of the hydraulic cylinder 9 and the center point of the filter press when the piston rod 11 of the hydraulic cylinder 9 is extended to open the parallel filter plates 5. When the stroke when the piston rod 11 of the hydraulic cylinder 9 is extended and the parallel filter plates 5 are opened is ST, the distance from the rear end of the cylinder tube 10 of the hydraulic cylinder 9 to the front end of the piston rod 11 front end. Becomes LO + ST. The distance from the center point P ′ of the hydraulic cylinder 9 extending the piston rod 11 (the center point P ′ of the open plate filter plate) to the tip of the piston rod 11 is (LO + ST) / 2, and the center point P ′ of the open plate filter plate Similarly, the distance from the rear end of the cylinder tube 10 of the hydraulic cylinder 9 is S + LO / 2. The distance from the rear end of the cylinder tube 10 of the hydraulic cylinder 9 to the direction adjuster 14 is S-ST / 2.
That is, when the closed parallel filter plates 5 are opened, the tip of the piston rod 11 moves to the rear frame 3 side by ST / 2, and the rear end of the cylinder tube 10 of the hydraulic cylinder 9 is the front. Move to the frame 2 (direction adjuster 14) side by ST / 2. When opening and closing a large number of filter plates to the left and right, it is not affected by the difference in sliding frictional resistance (load) of the filter plates supported on the guide rail, and the center point P ′ of the open plate filter plate = the center of the closed plate plate Even if a large number of filter plates 5 are opened and closed, the center point P of the parallel filter plates 5... (Hydraulic cylinder 9) does not shift to the left and right even if a large number of filter plates 5 are opened and closed. do not do.

6A and 6B are schematic views of a filter press opening and closing device according to another embodiment, in which FIG. 6A shows an operation state when the plate is closed, and FIG. 6B shows an operation state when the plate is opened. Direction adjusters 14 and 14 that wrap around a cylinder tube 10 of the hydraulic cylinder 9 and a drive band 15 connected to the piston rod 11 are arranged on the guide rail 4 near the center point of the filter press. In addition, although the direction adjuster 14 is arrange | positioned in the suitable place of the guide rail 4, arrangement | positioning of the direction adjuster 14 can also be arrange | positioned in the front frame 2 or the rear frame 3 shown in FIG. 1 or FIG. In this case, the number of direction adjusters 14 that wrap around the drive band 15 may be one. Further, the position of the driving band 15 connected to the cylinder tube 10 of the hydraulic cylinder 9 can be connected to an appropriate position such as the front end or the rear end, and the pulley direction adjusters 14 and 14 are configured by sprockets, The drive band 15 may be a chain.
As long as the position of the opening and closing plates of the movable heads 7 and 8 disposed at both ends of the large number of filter plates 5 can be restricted, the hydraulic cylinders 9 arranged in parallel along the upper and lower surfaces of the guide rail 4 are: The hydraulic cylinders 9 in FIGS. 1 to 6 may be combined as appropriate.

  FIG. 7 is a front view of a filter plate assembly that is supported by a guide rail and opened and closed. The filter plate arms 19 and 19 that are supported by the guide rails 4 and 4 are arranged on the shoulders on both sides of the filter plate 5 and A filtrate outlet 21, 21 is opened at both ends of the stock solution supply path 20 and the lower part at the center, and a concave filtration bed 5 a is formed at the center of the filter plate 5. Guide shafts 23, 23 are erected on head metals 22, 22 disposed on both shoulders of the filter plate 5, and springs 24, 24 are extrapolated, and a support bar 25 inserted through the guide shaft 23 is elastically pressed by the springs 24. A plurality of latches 26... Are provided on both side surfaces of the support bar 25.

8 is a front view of the filter cloth, in which a bag portion 27a is formed at the upper edge of the rectangular filter cloth 27, and a plurality of cutout holes 28 are engaged with the latches 26 of the support bar 25 shown in FIG. ... is open. A filter cloth support bar 29 is inserted into the bag part 27a at the upper edge of the filter cloth 27, and a bag part 27b having a notch is formed in the lower end part of the filter cloth 27 so that the weight 33 is inserted. It is. An undiluted solution supply through hole 30 is provided in the upper central portion of the filter cloth 27 to contact the undiluted solution supply path 20 of the filter plate 5, and the filter cloth 27 on the entire lower surface of the through hole 30 serves as a filtration surface.

FIG. 9 is a side view of an essential part of a filter plate on which a filter cloth is suspended, and the filter cloth support bar 29 inserted through the bag portion 27a at the upper edge of the filter cloth 27 shown in FIG. The filter cloth support bar 29 located in the notch hole 28 is engaged with the latch 26 of the support bar 25 disposed on the upper part of the filter plate 5 shown in FIG. 7, and the filter beds 5a and 5a of the front and rear filter plates 5 and 5 are engaged. A pair of filter cloths 27, 27 are hung on the front surface. As shown in FIG. 9, a stock solution supply plate 31 is fixed to one filter cloth 27 suspended between the filter plates 5 and 5. When the parallel filter plates 5 are closed, the filtration chamber 32 is formed in the pair of filter cloths 27, 27 between the filter plates 5, 5, and the stock solution supply fixed to the stock solution supply path 20 and the filter cloth 27 of the filter plate 5. The plate 31 is connected to supply the stock solution from the stock solution supply plate 31 to the front surface of the filter cloth 27. A nozzle 34 is disposed on the support bar 25 on which the filter cloth 27 is suspended to serve as a cleaning pipe, and the nozzle 34 is projected from a notch window 35 of the filter cloth 27 shown in FIG. The filter cloths 27, 27 that have opened the space between the filter plates 5, 5 and discharged the dehydrated cake are sprayed from the nozzles 34 provided on the support bar 25 to wash the filter cloths 27, 27 between the filter plates 5, 5. .

In the embodiment of the present invention, the filter plate opening / closing device in the filter press vibrates a large number of filter cloths 27 suspended from the parallel filter plates 5 at once to peel off the cake formed between the filter cloths 27, 27. Although it is used for the filter press 1, it can also be applied to a conventional filter cloth traveling type filter press that peels the cake by simultaneously running a number of filter cloths suspended between the opened filter plates downwardly, The present invention can also be applied to a conventional sequential open plate type filter press in which a large number of closed filter plates are opened one by one and vibrated to peel the cake.

FIG. 10 is a conceptual diagram of a hydraulic cylinder for opening and closing the filter plate and the center point of the filter press. The movable heads 7 and 8 are arranged on the left and right of the parallel filter plate 5, and the hydraulic cylinder 9 is attached to one movable head 7. This is a filter press that connects the rear end of the cylinder tube 10 and the tip of the piston rod 11 to the other movable head 8, and expands and contracts the piston rod 11 to open and close a number of filter plates left and right. The sign to use is
a: Center point of hydraulic cylinder (parallel filter plate) when the filter plate is opened b: Center point of filter press c: Center of hydraulic cylinder (parallel filter plate) when the parallel filter plate is closed In this case, when the hydraulic cylinder 9 opens and closes, it is desirable that the center point a at the time of opening and the center point c at the time of closing do not move.

FIG. 11 is a conceptual diagram of the center point of the hydraulic cylinder when the piston rod is extended, and the center positions of many filter plates 5 at the time of opening are not determined due to the difference in sliding frictional resistance (load) of the parallel filter plates 5. If the filter press.
The left and right setting permissible speeds are set to VL ′: left plate opening speed VR ′: right plate opening speed V: cylinder moving speed (V = VL ′ + VR ′)
Then, when the sliding friction resistance (load) of the left filter plate 5 is larger than the right filter plate 5, the right filter plate moves fast (VL ′ <VR ′). (A) moves to the right side (a ′). If the speed difference between VL ′ and VR ′ is large, the right movable head 8 comes into contact with the rear frame 3, and then the left filter plate is opened at the speed V. If the plate opening speed increases rapidly, there is a possibility that galling and rattling may occur on the sliding surface of the filter plate.

FIG. 12 is a conceptual diagram of the center point of the hydraulic cylinder when the piston rod is contracted, and the center positions of a large number of filter plates 5 at the time of closing are determined by the difference in sliding frictional resistance (load) of the parallel filter plates 5. It is a filter press when there is not. When the sliding friction resistance (load) of the left parallel filter plate is large when the hydraulic cylinder 9 is contracted from the open state of the parallel filter plate 5 and closed, as shown on the upper side of the guide rail 4, the hydraulic cylinder Center (c) is shifted to the left side (c ′).

Based on the investigation result that the center positions of a large number of filter plates 5 at the time of opening and closing the filter plates are not determined due to the difference in sliding frictional resistance (load) of the parallel filter plates 5, a countermeasure for the method of fixing the center point of the open and close filter plates is examined.
FIG. 13 is an image diagram for fixing the center position (center position of the parallel filter plates) of the hydraulic cylinder 9 in the process of extending the piston rod of the hydraulic cylinder,
c: Center point of hydraulic cylinder (center point of parallel filter plates)
LO: Length of hydraulic cylinder when piston rod contracts LO / 2: Distance from center point of hydraulic cylinder to rear end of cylinder tube and tip of piston rod ST ′: Extension amount of piston rod When the extension amount ST ′ of the piston rod 11 of the hydraulic cylinder 9 is ST ′ / 2 moved in the direction opposite to the extension direction of the piston rod 11, the center point c of the hydraulic cylinder 9 (the parallel filter plate There is no movement of the center point.
It can be seen that the rear end of the cylinder tube 10 of the hydraulic cylinder 9 and the tip of the piston rod 11 may be moved left and right by ST ′ / 2.

FIG. 14 is an image diagram of the center position of the hydraulic cylinder in the process of extending the piston rod of the hydraulic cylinder,
ST: Assuming that the piston rod is extended, if the piston rod 11 is ST extended when the parallel filter plate 5 is opened, if the entire hydraulic cylinder 9 is moved in the direction of the cylinder tube ST / 2, the piston rod 11 The tip portion moves by ST / 2, and the center point c of the hydraulic cylinder 9 (the center point of the parallel filter plates) does not move.
Distance from the center point c of the hydraulic cylinder 9 (the center point of the parallel filter plate) to the rear end of the hydraulic cylinder 9 = (LO + ST) / 2
Distance from the center point c of the hydraulic cylinder 9 (the center point of the parallel filter plate) to the tip of the piston rod 11 = (LO + ST) / 2
Thus, the center point of the parallel filter plate 5 does not move left and right.

Based on the idea of FIGS. 10 to 14 described above, when the parallel filter plates 5 are opened, the entire hydraulic cylinder 9 may be moved by 1/2 of the extension amount of the piston rod 11 in the direction opposite to the extension direction of the piston rod 11. I understand that.
As a measure to fix the center point c of the hydraulic cylinder 9 (the center point of the parallel filter plate), a rope fixed to the end of the cylinder tube 10 of the hydraulic cylinder 9 and the end of the piston rod 11 was hung on a pulley and examined. .
15 and 16 are conceptual diagrams of measures for preventing the shift of the center point P of the parallel filter plates 5 by moving the hydraulic cylinder 9 against the extending direction of the piston rod 11 backward.
FIG. 15 shows setting conditions for preventing slippage,
LO: Total length of hydraulic cylinder when piston rod contracts P: Center point of hydraulic cylinder when contracted (center point of parallel filter plates when closed)
S: Distance from the tip of the piston rod to the pulley when the hydraulic cylinder contracts D: Diameter of the pulley θ: Inclination angle of the rope that hangs around the pulley and connects to the hydraulic cylinder
Length from the center point P of the parallel filter plate (hydraulic cylinder) to the end of the cylinder tube 10 when the plate is closed = Length from the center point p of the parallel filter plate (hydraulic cylinder) to the tip of the piston rod 11 = LO / 2.
The distance between the center point of the parallel filter plate (hydraulic cylinder) and the pulley = S + LO / 2,
The distance between the tip of the piston rod 11 and the pulley is LO + S.
Here, the distance between the hydraulic cylinder 9 and the pulley is long, the pulley diameter D≈0, and the inclination angle θ≈0 of the rope hung around the pulley and fixed to the hydraulic cylinder 9 is approximated.

FIG. 16A is a conceptual diagram in the middle of extension of the piston rod, and both ends of the rope hung around the pulley are connected to the rear end portion of the cylinder tube 10 and the front end portion of the piston rod 11.
ST ′: Assuming that the extension amount of the piston rod of the hydraulic cylinder is the opening of the parallel filter plate 5 and when the piston rod 11 of the hydraulic cylinder 9 is extended ST ′, the center point P of the hydraulic cylinder 9 and the tip of the piston rod 11 The distance of the part is (LO + ST ′) / 2, and the distance between the terminal end of the cylinder tube 10 and the center point of the pulley is S−ST ′ / 2.
Therefore, the distance from the center point of the parallel filter plate 5 to the center point of the pulley is S−ST ′ / 2 + (LO + ST ′) / 2 = S + LO / 2, and the tip of the piston rod 11 from the center point P of the parallel filter plate 5 The distance to is equal. If both ends of the rope hung around the pulley are connected to the end of the cylinder tube 10 of the hydraulic cylinder 9 and the tip of the piston rod 11, the filter plates at the left and right ends maintain an equal distance while the parallel filter plate 5 is being opened. It can be seen that it moves.

FIG. 16 (b) is a conceptual diagram at the end of extension of the piston rod,
ST: Assuming that the extension amount of the piston rod of the hydraulic cylinder after opening is finished, the opening of the parallel filter plate 5 is completed, the piston rod 11 of the hydraulic cylinder 9 is extended ST, and the total length of the hydraulic cylinder 9 becomes LO + ST. The distance between the center point P and the tip of the piston rod 11 is (LO + ST) / 2.
The distance between the end of the cylinder tube 10 and the pulley = S−ST / 2, and the distance between the central point P of the parallel filter plate 5 and the pulley when the piston rod 11 is extended is S−ST / 2 + (LO + ST) / 2 = S + LO The distance between the center point P of the hydraulic cylinder (parallel filter plate) and the pulley when the piston rod 11 contracts as shown in FIG. 15 becomes equal to S + LO / 2, and the piston rod 11 of the hydraulic cylinder 9 is expanded or contracted. The center point P of the hydraulic cylinder (parallel filter plate) to be opened and closed does not move.
That is, the center point P of the parallel filter plate 5 that opens and closes the filter plate 5 does not always move with respect to the front and rear front frames 2 and the rear frame 3 when the parallel filter plate 5 that slides on the guide rail 4 is opened and closed. I can prove that.
From the above results, one end of the rope is connected to an appropriate position of the cylinder tube 10 of the hydraulic cylinder 9, the other end of the rope is connected to the tip of the piston rod 11 of the hydraulic cylinder 9, and the pulley is supported on the guide rail 4. If the ropes are hung around, even if there is a difference in sliding frictional resistance (load) between the parallel filter plates 5, the center point P of many filter plates 5 does not always move.
That is, it has been found that a large number of filter plates 5 move equally to the left and right by half of the extension amount of the hydraulic cylinder 9 with the center point of the parallel filter plates 5 as a boundary.

The filter plate opening and closing device in the filter press according to the present invention includes a movable head disposed at both ends of a parallel filter plate, and a rear end portion of a cylinder tube of a hydraulic cylinder and a front end portion of a piston rod connected to each other. In a filter press that can freely open and close the filter plate, a guide rail is provided with a direction adjuster, and a drive band connected to the appropriate position of the cylinder tube of the hydraulic cylinder and the tip of the piston rod is hung around the direction adjuster. When opening and closing parallel filter plates, the problem that the filter plates cannot stop at a predetermined position due to the difference in sliding frictional resistance (load) is solved. The central part of the plate) can always maintain a fixed position.
In addition, when the filter plates are opened and closed, when a large number of filter plates are opened and closed left and right with the center point of the parallel filter plates as a boundary, it is possible to obtain a function of expanding and contracting evenly by half of the extension amount of the hydraulic cylinder. This is synonymous with obtaining the opening and closing movement at the uniform speed of the left and right filter plate groups in the filter plate movement by the expansion and contraction of the hydraulic cylinder.
Therefore, the present invention can be applied to water sludge, sewage sludge, industrial wastewater sludge and the like using a filter press, and can be used particularly for a filter press that can reduce costs.

2 Front frame 3 Rear frame 4 Guide rail 5 Filter plate 7, 8 Movable head 9 Hydraulic cylinder 10 Cylinder tube 11 Piston rod 14 Direction adjuster 15 Drive belt 27 Drive belt

Claims (4)

A number of filter plates (5...) Are juxtaposed to a pair of guide rails (4, 4) bridged between the front frame (2) and the rear frame (3), and movable heads ( 7 and 8), the rear ends of the cylinder tubes (10 ...) of the plurality of hydraulic cylinders (9 ...) are connected to one movable head (7, 8), and the piston rod (11 ...) In a filter press in which the tip part is connected to the other movable head (8, 7) and a large number of filter plates (5 ...) can be opened and closed.
A direction adjuster (14) is arranged on the guide rail (4), and the direction of the drive belt (15) connected to the appropriate position of the cylinder tube (10) of the hydraulic cylinder (9) and the tip of the piston rod (11) is adjusted. A filter plate opening and closing device in a filter press characterized by being hung around a vessel (14). 2. A filter plate opening and closing device in a filter press according to claim 1, wherein a direction adjuster (14) for hanging the drive belt (15) is arranged in two upper and lower stages at an appropriate position of the guide rail (4). . 3. The filter press according to claim 1, wherein the direction adjuster (14) is constituted by a pulley or a sprocket, and a driving band (15) that is wound around the pulley or the sprocket is a belt or a chain. A filter plate opening and closing device. The opening and closing of the filter plate in the filter press according to any one of claims 1 to 3, wherein the direction adjuster (14) is disposed in the front frame (2) or the rear frame (3). apparatus.

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