JPH02251209A - Filter cloth lifting apparatus for filter press - Google Patents

Abstract

PURPOSE:To simplify structure, reduce sliding resistance when filter plates are fastened and unfastened and prevent the occurrence of unbalanced load between a drive shaft and a take-up pulley by raising filter cloth with a stringlike body which is wound on a take-up member, holding the filter cloth in the max. limit position by a hook member when filter plates are fastened and unfastened and supporting the take-up member by two yoke members. CONSTITUTION:A stringlike body 23 is wound on a take-up pulley 13 by its rotation to move upward filter cloth 15 and, when it reaches a predetermined height, a hook rod 21 is raised into a closed condition as shown by solid lines, the filter cloth 15 in held by the hook rod 21 using an engaging fixture 31 and the tension exerted on the filter cloth 15 is released from the string like body 23. In this condition, when filter plates 6 move to the side of a fixed frame while holding the filter cloth 15 therebetween and are fastened into a predetermined condition, unfiltered liquid is supplied between the filter plates 6 to perform operations such as filtration and compression. A group of filter plates 6 is then unfastened and the hook rod 21 is disengaged. The central part of the take-up pulley 13 is supported by yoke members 29 and 30 enterengaged by pin and rotatably connected to a bracket 9.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a so-called filter cloth running type filter press that cleans the filter cloth and collects filter dregs by running a filter cloth against the filter plate when the filter plate is opened. This invention relates to a lifting device for a filter cloth.

(Prior art) In conventional filter presses of this kind, when peeling off filter slag adhering to the filter cloth and cleaning the filter cloth, the tension of the filter cloth varies depending on the filter cloth, so the peeling state of the filter sludge may vary. This would result in incomplete cleaning and uneven cleaning, and during the next filtration process, the filtrate left behind would enter the filtrate and contaminate it, so two drive shafts were installed on the frame, front and rear, and each drive shaft had multiple A take-up pulley is slidably attached, and two string-like bodies connected to the upper end of the filter cloth are wound around the take-up pulley on each drive shaft to support the filter cloth so that it can be taken in and out between the filter plates. The other end of the filter cloth is wound around a take-up reroller installed below the filter plate, and a coil spring is mounted inside this take-up roller to constantly bias it in the winding direction. A filter press has been proposed in Japanese Patent Laid-Open No. 53-36772 in which the filter cloth is wound around a winding roller under constant tension due to a spring force when the filter cloth is released.

(Problems to be Solved by the Invention) By the way, the above-mentioned known filter press has the following problems.

(1) Two sets of each drive shaft, take-up ripley, and string-like body for suspending the filter cloth are required, resulting in a large number of parts and high cost.

(2) When tightening and releasing the filter plate, the filter cloth is always pulled up to its upper limit, so the tension torque applied by the spring in the take-up roller is at its maximum, and that tension is applied to the drive shaft. This creates sliding resistance between the filter cloth and the take-up pulley, and the filter plate cannot be tightened or opened smoothly.If the spring force is weakened to reduce this resistance, the downward movement of the filter cloth becomes incomplete. Put it away.

(3) The sliding resistance between the drive shaft and the take-up repulley fitted to it is large as mentioned above, and since both are in contact with steel, there is always grease, etc. between them. If a sufficient amount of lubricant is not applied, malfunction may occur, and on the other hand, this lubricant may scatter or leak, causing environmental pollution.

(4) Since both sides of the filter cloth are suspended by pulleys on two drive shafts, during the movement of the filter plate, the filter plate may not be parallel or perpendicular, or the filter plate and If the distance between the drive shafts is different and the filter plate is tilted back and forth, an uneven load will be applied between the drive shaft and the take-up repulley, which will hinder the movement of the filter plate.

Therefore, this invention has been devised to solve the above-mentioned problems.It simplifies the configuration, reduces the sliding resistance when tightening and opening the filter plate (also prevents contamination by lubricant, and prevents contamination from the drive shaft. The purpose is to prevent uneven loads from occurring between the take-up repulleys.

(Means for Solving the Problems) In order to achieve the above object, this invention supports a filter cloth by winding it around a winding member that is driven forward and backward by a string-like body connected to one end of the filter cloth. As a filter cloth elevating device for a filter press, the filter cloth is wound up by a take-up reroller whose other end is urged in the winding direction by a spring force. It is characterized in that it is connected to one string-like body per filter chamber, and the string-like body is wound around a winding ripley that is slidably provided on one drive shaft installed in the direction of the filter plate group, Second, the filter cloth is raised to a predetermined upper limit position suitable for the string-like body, the filter cloth is held at the upper limit position by a hook member rotatably supported on the filter plate, and the filter cloth is removed from the string-like body. The filter plate is tightened and opened by releasing the tension caused by the winding force of the cloth. Thirdly, the bearing part of the winding member of the string-like body is configured to transmit rotation from the drive shaft. The invention is characterized in that the winding member of the string-like body is divided into a part and a sliding part with respect to the drive shaft, and the sliding part is made of a material with a small coefficient of friction. A string-like body for two filter chambers is formed so as to be wound up, and the center portion of the winding member is supported by two yoke members connected to each other with pins, and is rotatably connected to a bracket on the filter plate. It is characterized by the fact that

(Function) During work, when the string-like body is wound up with a winding member and the filter cloth is raised to a certain height, the hook member operates and suspends the filter cloth, reducing the tension acting on the filter cloth. is released from the string-like body, and in this state, the winding member is slid onto the drive shaft to tighten the filter plate group, and the undiluted solution is sent between the filter cloths for filtration and compression. The plate group is released to disengage the hook member.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings. In Fig. 1, reference numerals 1 and 2 denote a fixed frame and a frame with a cylinder, which are erected facing each other on the floor at a constant interval, and between them are a required number of filter plates 6, which are attached to the frame 2. Cylinder 4! H; A loose head 3 operated by II 5 is disposed so as to be movable in the left-right direction, and a filter plate 6 at the left end is attached to the fixed frame 1, and a filter plate 6 at the right end is integrally attached to the loose head 3. ,
A guide roller 7 is attached to the center of the front and rear sides of the middle filter plate 6, excluding those at both ends, through a bracket 7a, and the guide roller 7 is connected to the left and right frames 1.
It is movably supported by a cross beam 4 installed horizontally between them, and upper and lower brackets on the front and rear sides are connected between these intermediate filter plates 6 and between the end intermediate filter plates 6 and the loose head 3. 7a and 8a, tie rod 8 of the required length (
In the final position, they are connected by a spring 8'), and the filter plate 6 is tightened and opened by the expansion and contraction action of the cylinder 75. In the delivery chamber between each filter plate 6, there is a support par 1 at the upper part as shown in Figs. 1 to 3.
Filter cloths 15 suspended in an inverted V shape by 4 are respectively disposed, and are raised and lowered through the support pars 14 by a lifting device (to be described later) when the filter plate 6 is opened. One support par 14 except for
One filter plate 6 is sandwiched between the left filter cloth of the two filter cloths 15 hanging from the support par 14 and the right filter cloth of the filter cloths 15 hanging from the adjacent support par 14. The hooks are respectively rotated by left and right guide rollers 17 and 18 installed between the front and rear brackets 20 provided under the filter plate 6, and the upper take-up reroller is rotated so that the filter surfaces are in contact with each other. It is wrapped around 16.

A coil spring (not shown) with a constant strength is interposed in the winding roller 16 between it and the central shaft, and constantly biases the roller 16 in the winding direction to prevent the filter cloth 15 from being wound and rewound. The guide roller 1 is designed to apply tension to the guide roller 1.
7. A cleaning pipe 19 is provided below the filter cloth 1.
The filter cloth is washed when it is wound up.

Filter plate 6 fixed to fixed frame 1 and loose head 3
Similarly, the winding roller 16 and the guide roller 17 are placed on the lower side.
Or 18, a cleaning pipe 19 is provided to wind up and wash the filter cloth 15 located at the left end or right end.

On the other hand, one drive shaft 12 is mounted on the left and right frames 1 and 2 via a bearing 10, as shown in FIG. Board 6
One end of the motor 11 is connected to a motor 11 with a speed reducer through a coupling or the like to rotate forward and reverse, and its drive shaft 12 is polygonal (hexagonal in the figure). A plurality of pulley members P each having a cross section and having two take-up pulleys 13 united by an intermediate boss portion 13a are arranged on the shaft, and each take-up pulley 13 corresponds to the upper part of each support par 14 of the filter cloth 15. Each take-up repulley 13 has a locking tool 31 in the shape of a letter provided on the center of the support par 14 of the filter cloth 15, which has a locking space for a hook rod. A fixed string-like body 23 such as a wire lobe is wound around each of them, and when the drive shaft 12 is rotated in the normal direction and the string-like body 23 is wound up by the winding pulley 13, the filter cloth 15 rises and is rotated in the reverse direction. If you rewind it, the filter cloth 1
5 is lowered and taken up by a take-up reroller 16.

Further, an inverted-shaped bracket 9 is attached to the upper surface of each filter plate 6, which corresponds to the lower side of the intermediate boss portion 13a of the pulley member P, and a third bracket 9 is attached to the tip of the horizontal piece of each bracket 9.
As shown in the figure, the upper end of the hook rod 21 for supporting the upper limit of the filter cloth, which is shaped like an inverted front letter, is rotatably attached to the pin 22, and the lower end of the hook rod 21 is rotatably attached to the center part of the lower locking piece 21a and hanging from the bracket 9. A coil spring 26 is hooked between the piece 9b and is always biased to stand up on the side of the bracket 9, and when it stands up as shown by the solid line, the lower locking piece 21a supports the filter cloth on both sides. Adjustment screw 27 of locking tool 31 on par 14
A bushing rod 24 is attached horizontally to the vertical piece of the hook rod 21, and a bushing rod 24 is attached to the tip of the bushing rod 24, which is rotated between the frames at both ends below the drive shaft 12 and parallel to it. A protrusion 32 attached to a shaft 25 is brought into contact with a movably constructed rocker supported by a receiver 9a on each placket 9, and the protrusion 32 is moved to the position shown by the two-dot chain line by the rocker shaft 25. Rotate and push the bushing rod 25 to release the hook rod 21.
When the lower stop piece 21a is placed in the two-dot chain line position, the lower stop piece 21a engages with the locking tool 31.
This allows the filter cloth 15 to be freely moved up and down.

As shown in FIG. 1, a rotating rod 25a connected to a cylinder mechanism (not shown) is provided at the end of the rocker shaft 25, and the rocker shaft 25 reciprocates within a certain range in synchronization with the operation of the filter. It is designed to rotate.

Pulley member P fitted and arranged on drive shaft 12 as described above
An example is as shown in FIGS. 4 and 5A, and the inner surface of the central part of the intermediate boss portion 13a has a hole 13b having the same polygonal cross section as the drive shaft 12, as shown in FIG. 5A. On the other hand, a hole 13C1 with a large diameter circular cross section like the hole 13b is formed on the inner surface of both sides, as shown in the figure, and a drive shaft is installed in the both sides having the large diameter circular hole 13c. Bushes 2B made of a synthetic resin with a small coefficient of friction such as tetrafluoroethylene or polyacetal and having a circular outer surface and the same polygonal inner surface as the drive shaft 12 are fitted between the pulley members 12 and 12. Stopper 36 attached to the side of P
This ensures that no one is left out.

The gap between the inner surface of the bushing 28 and the surface of the drive shaft 12 is t, and the outer surface of the bushing 28 and the pulley boss portion 1
The gap between the circular holes 13c on both sides of the pulley boss portion 13a is S, and the polygonal hole 13b in the center of the pulley boss portion 13a and the main shaft 12
When the gap with the surface is t2, Lx > t+ +
The pulley member P
A gap S1 exists between the bushing 28 and the bushing 28 to allow rotation.

Therefore, one rotation of the drive shaft 12 causes both the pulley member P and the bush 28 to rotate, but the pulley member P and the bush 28 rotate together.
It is designed so that you can slide between it and 8.

Further, the central step portion of the boss portion 13a of the pulley member is supported by a first yoke member 29 with an open top semicircular shape and a presser foot 29a, and groove-shaped grooves with an open top are provided on both sides of the upper end of the first yoke member 29. The upper ends of both sides of the second yoke member 30 are opened semicircularly as shown in FIG.
0 is equipped with a pin shaft 30a at the center of the lower side, and the pulley member P is supported through this pin shaft 30a. The second yoke member 29,30 is rotatably supported horizontally on the bracket member 9 on the filter plate.

Based on the above configuration, its operation will be explained with appropriate reference to the process block diagram of FIG. 7.

When the control device attached to the frame 1.2 is switched on to start work, the solenoid valve for opening and closing the hook rod 21 and the limit switch are turned on, and the cylinder is activated to move the rocker shaft 25 as shown in Fig. 3. It is rotated counterclockwise, and the bushing rod 24 is pushed by the protruding rod 32, and the hook rod 21 is rotated to the position indicated by the chain double-dashed line, where it is removed from the locking tool 31.

Next, the motor 11 is started in the normal rotation direction, and the drive shaft 25
Each take-up pulley 13 rotates, the string-like body 23 is wound up, and each filter cloth 15 rises via the support par 14. When a certain height is reached, the motor 11 is stopped by the action of the stop switch, and each filter cloth 15 is lifted up through the support par 14. The cloth 15 becomes stationary. At this time, the solenoid valve is deenergized, the cylinder returns to its original position, and the rocker shaft 25 also reverses, returning the protrusion 32 to the solid line position.

Then, due to the restoring action of the coil spring 26, the hook rod 21 stands up to the closed state shown by the solid line, and its lower stop piece 21a engages with the lower end of the adjusting screw rod 27 of the locking tool 31 on the support par 14. In this state, the drive shaft 12 is slightly reversed by the motor 11, and a photoelectric filter cloth upper limit switch (
(not shown) confirms the raised position of each filter cloth 15.

In this state, each filter cloth 15 is rested on the hook rod 21 via the locking device 31 on the support par 14, and the tension acting on each filter cloth 15 by the lower winding roller 16 is applied to each assembly. It does not reach 23 and becomes slightly slack. Thus, the filter plate tightening valve (not shown) is opened and pressurized fluid is supplied to the extension side of the cylinder 5 on the frame 2, and the actuation of the cylinder 5 causes each filter plate 6 to close to the filter cloth through the loose head 3. 15 is moved to the fixed frame 1 side and tightened, and when the tightening pressure reaches a predetermined value, it is detected by a pressure switch and maintained at a constant state.

When the filter plates 6 are moved, guide rollers 7 provided on the front and rear sides of each filter plate 6 run on the cross beams 4 while moving.
Each pulley member P arranged on the drive shaft 12 is moved in the same direction via the bracket 9 on the lower filter plate.
At that time, the tension of the filter cloth 15 is not applied to the string-like body 23 wound around each pulley 13, and the synthetic resin bushings 28 with a small friction coefficient disposed inside both sides of each pulley member P are Since the pulley members P slide through the filter plate 6, there is little resistance between them and the drive shaft 12, and each pulley member P moves smoothly together with the filter plate 6.

When each filter plate 6 is tightened to a certain state as described above,
As usual, the stock solution is supplied between each filter plate 6, and a series of processing operations such as filtration, compression, and blowing are performed.

After a certain period of time, pressure fluid is supplied to the cylinder H5 of the frame 2 on the contraction side, and due to the contraction action, each filter plate 6 is sequentially pulled toward the frame 2 side by the loose head 3 and tie rod 8, and each filter Plate 6 and drive shaft 1
When the pulley members P on 2 are spread out to a predetermined distance as shown in FIG. 1, the operation of the cylinder 5 is stopped. Then motor 1
1 is rotated in the forward direction for a short period of time, tensioning the string-like body 23 and lifting the filter cloth 15 slightly, the motor 11 stops and the solenoid valve for opening and closing the hook rod operates again, causing the rocker shaft 25 to open and close the hook rod. It is rotated in the direction and the thrust rod 3 is turned again.
2. The hook rod 21 is rotated to the position indicated by the chain double-dashed line via the bushing rod 24.

When the motor 11 is reversed in this state, the string-like body 23 wound around each take-up pulley 13 is unwound, and each filter cloth 15 is unwound.
is lowered, and the filter cloths on both sides of the filter plate pass through the guide rollers 17 and 18 of the lower bracket 20 and are wound up with the filter surfaces aligned with the winding roller 16.

The cake (filter slag) formed on the surface of the filter cloth by this operation is peeled off from the filter cloth 15 by the folding action of the guide rollers 17 and 18 and discharged. When the filter cloth 15 reaches the lower limit position, the motor 11 is switched to the normal rotation direction, and cleaning water is injected from the cleaning pipe 19, and the filter cloth 15 is pulled up while being washed and prepared for the next operation.

In addition, the pulley member P may have the pulley 13 and boss portion 13a as separate members as shown in FIG. The pulley member P may be slidably attached via the key 38.

(Effects of the Invention) As described above, in this invention, the filter cloth is wound around and supported by a winding member connected to one end of the filter cloth, and the other end of the filter cloth is spring-biased in the winding direction. As a lifting device for a filter cloth of a filter press that is designed to be wound up, the upper center part of the filter cloth is wound up by a winding member on one drive shaft using an integrated string-like body, which is different from the conventional one. It has a simple structure with fewer parts compared to others, and the filter plate can be moved without any problem even if the filter plate is not parallel or tilted, and the filter cloth can be suspended when tightening or opening the filter plate. Since the tension of the filter cloth is not applied to the string-like body, the sliding resistance of the string-like body to the drive shaft of the winding member can be significantly reduced. The part is divided into a rotation transmission part and a sliding part, and the sliding part is made of a material with a small coefficient of friction, so the winding member can slide smoothly and there is no need for oil between the bearing and the drive shaft. In addition, the winding member for the string-like body is formed by a pair of winding ripleys, so that the string-like body for two chambers can be wound at the same time. Since the central part of the take-up member is supported by two yoke members in the same way as a universal joint, the structure of the take-up member is compact and easy to handle, and when the filter plate is moved, tearing and uneven loads are not applied to the take-up member. Even if the filter cloth is suspended, the filter cloth can be easily suspended and the filter plate can be moved smoothly by absorbing this.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, and FIG. 1 is an elevational view of the entire device. Figure 2 is a front view of one filter plate section. FIG. 3A is a front view of the filter cloth lifting member. The opening in the figure is a perspective view of the hook rod part. FIG. 4 is a cutaway side view of the winding member. FIG. 5A is a sectional view taken along line A-A in FIG. 4. The opening in the figure is a sectional view taken along the line B-B in FIG. 4. Figure C is a side view of the section taken along line C--C in Figure A. FIG. 6A is a partial sectional view of a modified example of the winding member. Figure 7 is a process block diagram. In the figure, 1... Fixed frame, 2... Frame with cylinder, 3... Loose head, 5... Cylinder 6...
Filter plate, 9... Bracket, 11... Motor, 12... Drive shaft, 13... Winding pulley, 14... Support par 15... Filter cloth,
16... Winding roller, 21... Hook rod,
23...String-like body, 24...Butsch rod, 25
...Rocker shaft, 28...Button, 29.
...First yoke, 30...Second yoke, 31...
・Locking tool, P...Pulley member

Claims (4)

[Claims] (1) The filter cloth is supported by being wrapped around a winding member that is driven forward and backward by a string-like body connected to one end, and the other end of the filter cloth is supported by a winding roller that is biased in the winding direction by a spring force. In a lifting device for a filter cloth of a winding filter press, the center part of the upper end of the filter cloth in the width direction is connected to one string-like body per filter chamber, and the string-like body is connected in the direction of the filter plate group. 1. An elevating device for a filter cloth of a filter press, characterized in that the filter cloth is wound up on a take-up pulley that is slidably provided on one drive shaft installed in the filter press. (2) Raise the filter cloth to a predetermined upper limit position with a string-like body,
The filter cloth is held at the upper limit position by a hook member rotatably supported on the filter plate, and the tension caused by the winding force of the filter cloth is released from the string-like body to tighten and open the filter plate. The filter cloth lifting device according to claim 1, characterized in that the filter cloth lifting device has the following features. (3) The bearing part of the winding member of the string-like body is divided into a rotation transmission part from the drive shaft and a sliding part with respect to the drive shaft, and the sliding part is formed of a material with a small coefficient of friction. The filter cloth lifting device according to claim 1. (4) A yoke member in which a string-like body winding member is formed by a pair of winding pulleys to wind up the string-like body for two filter chambers, and the center portions of the winding members are connected to each other with a pin. 4. The device for lifting and lowering a filter cloth according to claim 1, wherein the filter cloth is supported by a filter cloth and is rotatably connected to a bracket on the filter plate.