JPH0741125B2 - Filter press with control device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a filter press. The present invention is particularly applicable to a press frame having guide members formed therein, a plurality of filter plates arranged laterally with respect to the guide members, and a swivel centered on a lateral axis in a lower region of each filter plate. Is provided,
An expansion clip that is swivelable from a reference position to an expansion position, which is included in a plane substantially common to each side surface of the filter plate, and fixed to each filter plate on the lower side and stretched on the side surface, and on the upper side, corresponding The filter cloth fixed to the expansion clip and the filter plate are sequentially displaced along the guide member to form an opening between two filter plates adjacent to each other, and the expansion clip and the filter are disposed in the opening. The present invention relates to a filter press having a displacement mechanism for removing a filter cake formed between adjacent filter plates by pivoting and separating the cloth from mutually opposite side surfaces of the filter plate.

[0002]

2. Description of the Related Art A filter press having the above structure is
It is known from EP 0 208 899 B1. When opening such a filter press, the clips facing each other on both sides of the opening, together with the filter cloth fixed thereto, are automatically swiveled by the load of the filter cake formed between the filter cloths or of the displacement mechanism. Collaborate to reach the open position. Then, at the open position, since each filter cloth is inclined from the corresponding filter plate, normally, the filter cake attached to the filter cloth peels off and falls off. next,
In the opening process, of the filter plates that have not been displaced yet, the frontmost filter plate is displaced by the displacement mechanism and brought into contact with the previously displaced filter plate. In doing so, the spreading clips and the filter cloth facing each other on these filter plates are pivoted back to the vertical stop position. If this filter cloth or another filter cloth remains attached to the filter cake, or part of it, which should have been originally removed, emptying the filter press is usually fine. However, if a considerable amount of filter cake remains, the absorbency will be reduced in the next working step of the filter press. In addition, the adherence of the adjacent filter plates may be hindered by the remaining filter cake in the adhering state, which may hinder the continuous operation of the press.

German Patent Application Publication No. 36 40 1
According to the known technology disclosed in Japanese Patent Publication No. 71, when the filter press is opened, the filter plate is separated from the adjacent filter plate, and the attached filter cake is at a position where it should have been originally removed. The filter plates are individually and continuously weighed, and the filter plates are vibrated or swung until the determined weight matches the filter plate's own weight and the filter cake is no longer attached. This requires extensive equipment and is almost unacceptable with conventional filter presses of the above construction. That is, the filter cloth stretched around each expansion clip has a high possibility of releasing the filter cake when it reaches the open position at the latest, and the filter press hardly guarantees smooth use of the weighing device. Is.

According to the filter press disclosed in European Patent No. 0 177 170 B1, the side surface of the filter plate is covered with a filter cloth in the filter press having the above-mentioned structure. However, the filter cloth is not locked to the clips provided on the corresponding filter plate, and is usually arranged parallel to the upper edge of the filter plate and is suspended by a pair of ropes. Locked in.
The rope is fixed to the roll, and the roll is fixed to the shaft so as to be displaceable in the longitudinal direction. The shaft extends above the filter plate in the longitudinal direction of the filter press, can be rotationally driven by a motor, and has a profile shape that rotates the rolls in an interlocking manner. In this case, each two filter cloths corresponding to the adjacent filter plates are lowered from the upper position for filtering to the lower position. Below, a pair of filter cloths corresponding to the filter plates are fixed to rolls, which rolls are mounted on a frame which is fixed to the filter plates below the lower edge of the corresponding filter plate.

When opening this known filter press, all filter plates are distributed over the entire length of the filter press to form an even intermediate space between the filter plates. Next, the filter cloth is lowered by rotating the upper roll and the lower roll, and is wound up by the lower roll. At that time, it is necessary to separate the filter cake from the filter cloth. In order to control the subsequent return of the filter cloth to the upper position, a strap is attached to the support member arranged above the filter plate in the longitudinal direction of the filter press.
Lock to create limited vertical play. After removing the filter cake, when pulling up the rods that are locked to each pair of ropes and support the two filter cloths, each rod abuts the strap to further displace the support member upward. The strap is formed with one window each aligned with the light gate in its upper position. Then, when all the straps have reached the upper position, a command signal for closing the filter press is immediately issued.

Known control devices for controlling the removal of the filter cake from the filter press are costly and the filter press is long and therefore all filter plates with two adjacent filter plates are used to remove the filter cake. It can only be used if it can be moved simultaneously to a position forming an opening of sufficient width. In other words, a filter press of a given length can accommodate a relatively small number of filter plates.

[0007]

DISCLOSURE OF THE INVENTION The object of the invention is to propose a filter press with a simple and compact control unit which enables a reliable automatic operation of the filter press.

In order to solve this problem, the present invention is directed to a filter press having the above-mentioned structure, in which the expansion clip, the corresponding filter cloth and the filter cloth when the expansion clip is swung toward the corresponding filter plate. The torque generated by the total weight of the filter cake attached to the is also smaller, and a configuration in which a torque larger than the torque generated by the total weight of the expansion clip and the filter cloth on which the filter cake is not attached is applied to the expansion clip. Further, a control device for controlling the displacement mechanism is provided, and only when the filter plate to be displaced and the expanding clip and the filter cloth facing each other of the filter plate displaced prior to the displacement are respectively in the stop position. Filter mechanism by the displacement mechanism It is characterized in allowing a displacement of over bets.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described more specifically with reference to illustrated embodiments.

The filter press shown in FIGS. 1 to 3 comprises a press frame 10 on which four stands 12 are provided. The stands 12 are arranged in pairs at each end of the press frame 10 and are connected to each other via a front traverse 14 located on the left side of FIG. 1 or a rear traverse 16 located on the right side of FIG. Both traverses 14 and 16 are connected by horizontal beams parallel to each other, and these horizontal beams form a large number of filter plates.
Configure a guide member 18 for 20.

The filter plate 20 is arranged between the front filter plate 20 'and the rear filter plate 20 ". Each filter plate forms a grooved surface 22 facing the adjacent filter plate. Both the front and rear side surfaces of the filter plate 20 are formed as grooved surfaces 22 which are customary as filter plates for filter pressing.Each filter plate 20 is provided with two arms 24 protruding laterally.
By engaging these arms 24 with both horizontal beams of the guide member 18, the filter plate 20 can be selectively operated in the following manner, that is, in the direction of the longitudinal axis A of the filter press in which the filter plate 20 is defined by the guide member 18. Independently or together with the rest of the filter plate 20 and the rear filter plate 20 ″, it is displaceably supported.

Each filter plate 20 has each arm 24
The support shaft 26 is provided so as to project laterally from below. Support shaft
On top of 26 is a spring similar to the spring in a clothespin.
28 and one vertical leg in each of the two inverted U-shaped expansion clips 30 are pivotable about a lateral axis B defined by the support shaft 26. That is, two expansion clips 30 are arranged on each filter plate 20. Two expansion clips 30 corresponding to each filter plate 20 have springs 28 arranged on both support shafts 26.
Are urged to occupy one vertical reference position each. At this reference position, each expansion clip
It is located at least approximately in the plane of the corresponding side surface 22 of the filter plate 20. Each expansion clip 30 has a spring 28
It is configured so that it can be separated from the corresponding side surface 22 by turning against the force of. This is as shown for each expansion clip 30 of the two filter plates 20 facing each other in the separated state in FIGS. 1 and 2.

A rectangular filter cloth 32 is fastened to each spreading clip 30 at the upper edge and to the corresponding filter plate 20 at the lower edge at the level of the support shaft 26 or slightly below it. Each filter cloth 32, along with a corresponding expansion clip 30, is pivotable between a reference position where the filter cloth contacts the corresponding side surface 22 and an illustrated expanded position where the filter cloth is spaced from the corresponding side surface 22. . All expansion clips 30 and filter cloth 32 for filtration
Must occupy the reference position. In this case, the filter cakes C are formed between the filter cloths 32 arranged in pairs between the adjacent filter plates 20 to prevent leakage.

Front and rear filter plates 2
One expansion clip 30 is provided on each of 0 ′ and 20 ″, and one filter cloth 32 is fixed to each of these expansion clips 30. The filter cloth 32 is a single filter cloth on the front and rear filter plates. Corresponds to one grooved side 22.
The front filter plate 20 'is fixed to the front traverse 14, and the front traverse is set to a size sufficient to support the filter plate 20' entirely. The rear filter plate 20 ″ is fixed to a suitably sized displacement plate 34.
The displacement plate 34 can be displaced by the operation of a hydraulic closing cylinder supported by the rear traverse 16.
In the state shown in FIG. 1, the displacement plate 34 occupies an open position where an opening D can be formed between any two filter plates.

The press frame 10 is provided with longitudinal rails 38 spaced above the filter plate 20 and arranged parallel to the guide member 18. The longitudinal rail 38 is used for running the displacement mechanism 40 having the carriage 42, and the carriage 42 surrounds the filter plates 20, 20 ', 20 "from above together with the pair of brackets 44 projecting downward. As shown in, a horizontal support shaft 46 is provided in the vicinity of the lower end of each bracket 44, and a catch 48 for transporting the filter plate 20 is pivotably arranged on the support shaft 46.

The transfer of the filter plate 20 is usually performed in the following manner. That is, the rear filter plate
After opening the filter press involving only 20 ″, the individual filter plates 20 are continuously transferred from front to back, FIG.
And in FIG. 2, it is displaced from the left side to the right side. that time,
The filter cloths 32 facing each other on both sides of the sequentially formed openings D swirl toward each other because the filter cake C formed between them is still attached. As a result, a channel that expands downward is formed to allow the filter cake C to fall. When the filter cake C has been completely removed from both adjacent filter cloths 32, the spreading clips 30 pivot again under the action of the spring force of the corresponding springs 28 to the vertical stop position.

As described above, when the filter press completely removes the filter cake C, the displacement plate 34
Is displaced from the open position shown in FIG. 1 to the front side, ie the closed position located on the left side of FIG. In this closed position, all the filter plates 20, 20 ', 20 "and the filter cloth 32 arranged between them are fastened to form a filter unit.

The above matters are common to all filter presses according to the illustrated embodiments. Furthermore, in the filter press of each example, the weight of the filter cloth 32 is reduced by the filter cake C formed between the filter cloths 32 passing through the openings D and falling, and as a result, the filter cloth 32 corresponds. It also has a common feature that it has a control device that surely operates the displacement mechanism 40 only when the swiveling return is performed to the vertical position together with the expanding clip 30.

As shown in FIGS. 1 to 4, each expansion clip
Fix limit switch 50 to 30. Limit switch
50, when the corresponding expansion clip 30 occupies the vertical position,
The corresponding filter plate 20 is pressed and closed. All of these limit switches 50 are connected in series via a cable 52. The cable 52 is fixed to the arm 24 of each filter plate 20 and forms a loop outside the support bar attached to the guide member 18. The cable 52 connects to a connection box 54 on both traverses 14, 16 via which the controller is connected to a current source (not shown). The current circuit thus formed is closed only if all the spreading clips 30 occupy a vertical position.
This circuit allows a displacement mechanism 40, particularly preferably a closed cylinder.
By also controlling 36, displacement of the filter plate is prevented as long as at least one spreading clip 30 occupies the tilted position. At least one spreading clip 30 occupies the tilted position at least in the filter cake.
This is because it is determined that a part of 10 is left as an adhered state on the corresponding filter cloth 32.

In the embodiment shown in FIG. 5, a front side sensor 56 and a rear side sensor 58 are provided as a part of the control device, and these sensors 56, 58 are inclined downward at mutually different angles so that the carriage of the displacement mechanism 40 is inclined. Fix at 42. Front sensor
As for 56, the filter cloth 32 tilted backwards is the sensor 56
Adjust to give an alarm signal when positioned below. On the other hand, the rear sensor 58 is adjusted so as to issue an alarm signal when the filter cloth 32 inclined forward is positioned below the sensor 58. Each filter plate
Prior to the displacement of 20, the carriage 42 occupies the position shown in FIG. In this position, both sensors 56, 58 are oriented in the center of the opening D in the press. The luminous fluxes 56 ', 58' emitted from the sensors 56, 58 intersect approximately on the longitudinal axis A or at a position slightly above the longitudinal axis A as shown in FIG. In the embodiment shown in FIG. 5, the carriage
Both sensors 56, 58 have the advantage of being able to detect the filter cloth 32 at the same time while 42 is stopped.

The embodiment shown in FIGS. 7 and 8 is based on both sensors.
Wagon 42 so that diffused light beams 56 'and 58' can be obtained.
It is different from the embodiment shown in FIG. As a result, the method of using the filter press according to this example differs from the method described above in the following points.
First, as shown in FIG. 7, the front sensor 56 has a press opening D.
Is detected whether or not the filter cloth 32 remains tilted forward. Then, when the carriage 42 is displaced forward, as shown in FIG. 8, the rear sensor 58 detects whether or not the filter cloth 32 maintains the state in which the filter cloth 32 is tilted rearward with respect to the press opening D. Only when it is determined that none of the above applies, the next filter plate is carried. This configuration and operation mode is the press opening D
This is advantageous in that it is unlikely to be affected by the deviation from the preset value calculated in.

In both the embodiment shown in FIG. 5 and the embodiments shown in FIGS. 7 and 8, the sensors 56 and 58 are, for example, light emitters which emit light in the infrared region (wavelength 880 nm) at a predetermined timing. Can be configured by a commercially available photoelectric proximity switch including.

In the case of the filter press according to the embodiment shown in FIGS. 9 and 10, the optical gate 60 is provided as a part of the control device.
To provide. The light gate 60 is arranged at the same height as the upper edge of the filter plate 20 and at a position slightly separated laterally from the filter plate 20, and the light source 62 is provided at the rear portion of the press frame 10 and at the front portion thereof. Positions the sensor 64.
Each expansion clip 30 is provided with a ridge 66 protruding laterally at the height of its upper leg portion. Only when the expanding clip 30 occupies the vertical position, the protrusion 66 can be configured not to block the light beam emitted from the light source 62.

[Brief description of drawings]

1 shows a first filter press according to the invention, FIG.
It is a side view which shows an Example.

FIG. 2 is a partially enlarged view of FIG.

3 is a cross-sectional view taken along the vertical plane III-III in FIG.

FIG. 4 is a partial cross-sectional view taken along the horizontal plane IV-IV of FIG.

FIG. 5 is a second view of a filter press according to the present invention.
It is a side view similar to FIG. 1 which shows an Example.

6 is an enlarged cross-sectional view taken along the vertical plane VI-VI of FIG.

FIG. 7 is a side view of the filter press in a first operating stage corresponding to FIG.

FIG. 8 is a side view of the filter press in a second operation stage.

FIG. 9 is a side view similar to FIG. 1, showing another embodiment of the filter press according to the present invention.

10 is an enlarged cross-sectional view in the vertical plane XX of FIG.

[Explanation of symbols]

 10 Press frame 18 Guide member 20, 20 ', 20 ″ Filter plate 22 Side surface 30 Expansion clip 32 Filter cloth 40 Displacement mechanism 50 Limit switch 56, 58 Photoelectric sensor 60 Optical gate 66 Ridge A Longitudinal axis B Horizontal axis C Filter cake D opening

Claims (7)

[Claims] 1. A press frame (10) having a guide member (18) formed therein, a plurality of filter plates (20) arranged laterally with respect to the guide member (18), and each filter plate (20). Is provided so as to be rotatable about the horizontal axis (B) in a lower region of the filter plate (20) and is rotatable from a reference position included in a plane substantially common to each side surface (22) of the filter plate (20) to an expanded position. Expansion clip (30),
The filter cloth (32) fixed to each filter plate (20) on the lower side and stretched on the side surface (22), and fixed to the corresponding expansion clip (30) on the upper side, and the filter plate (20). Two filter plates (20) that are sequentially displaced along the guide member (18) and are adjacent to each other
An opening (D) is formed between the opening (D), and the expanding clip (30) and the filter cloth (32) are pivoted and separated from the mutually opposite side surfaces (22) of the filter plate (20). Adjacent filter plate (2
In a filter press equipped with a displacement mechanism (40) for removing the filter cake (C) formed between 0), when the expanding clip (30) is swung toward the corresponding filter plate (20), The torque generated by the total weight of the expansion clip (30), the corresponding filter cloth (32) and the filter cake (C) attached to the filter cloth is smaller, and the expansion clip (30) and the filter cake (C) are also generated. Filter cloth (3
A torque that is larger than the torque generated by the total weight of 2) is applied to the expansion clip (30), and further, a control device that controls the displacement mechanism (40) is provided, and a filter to be displaced from now on. Spreading clips (30) and filter cloth (32) facing each other between the plate (20) and the filter plate (20) displaced prior to this.
The displacement mechanism (4
A filter press which allows the filter plate (20) to be displaced by (0). 2. The filter press according to claim 1, wherein the control device for each expansion clip (30) is a limit switch (5) cooperating with a corresponding filter plate (20).
0) A filter press characterized by comprising. 3. The filter press according to claim 2, wherein each limit switch (50) is connected in series to a common electric circuit, and the displacement mechanism (40) can be operated only when the electric circuit is closed. A filter press characterized by being used. 4. The filter press according to claim 1, wherein at least one photoelectric sensor (56, 58) arranged in the displacement mechanism (40) is provided in the control device. . 5. The filter press according to claim 4, wherein two photoelectric sensors (56, 58) for controlling two filter cloths (32) facing each other are provided with a displacement mechanism (4).
Filter press, characterized in that it is located in 0). 6. The filter press according to claim 1, wherein an optical gate (60) interrupted by a spreading clip (30) pivotally displaced from a stop position is arranged on the press frame (10). Filter press to do. 7. The filter press according to claim 6, wherein each of the expanding clips (30) is provided with a ridge portion (66) for blocking the optical gate (60).