JP5297961B2 - Filter press and operation method thereof - Google Patents

Description

  The present invention relates to a filter press apparatus and an operation method thereof.

As is well known, a recent filter press apparatus has a filter plate group consisting of a plurality of filter plates that can be expanded and contracted in the thickness direction of the filter plate in order to form a large number of filter chambers for the purpose of improving the filtration efficiency. The filter plates are pressed and adhered to each other at the time of filtration to form a filter chamber between the filter plates, and when the dehydrated cake is discharged, the filter plates are separated from each other and the dehydrated cake is discharged from between the filter plates. Yes.
As an apparatus for expanding and contracting such a filter plate group, there is one previously proposed by the present applicant in Japanese Patent Publication No. 4-9566 (Patent Document 1). This opening / closing device is connected to a filter plate group composed of a plurality of filter plates, which can be freely opened and closed in the thickness direction of the filter plate, and a filter plate on one side end of the filter plate group via a hydraulic cylinder. And a moving table that is movable back and forth in the direction of expansion and contraction of the filter plate group. By extending and contracting this cylinder, the one end filter plate on the one side while the cylinder takes a reaction force on the moving table. The other end of the filter plate is pressed and tightened, and the filter plate open / close distance can be made very long while having a simple device configuration, and the number of filter chambers can be increased accordingly. is there.
In such a conventional apparatus, a hydraulic cylinder is constructed as a clamping device on one end end filter plate and a moving table, and a large-diameter hydraulic cylinder is required to increase the clamping force. The increase in cost was a problem. Also, as the hydraulic cylinder increases in size, the weight of the part that moves together with the moving base increases, so a large driving source is required for the moving base. However, it was a problem that it became higher.

On the other hand, the filter press device is sometimes used in dewatering equipment for wastewater such as a water purification plant. In such a case, if a hydraulic cylinder is used, the hydraulic oil is not only supplied from the cylinder itself but also from hydraulic piping, a hydraulic unit, etc. It was also a problem that there was a risk of leakage and mixing with drainage or dehydrated matter.
Therefore, the present applicant has developed a thing of Patent Document 2 for the purpose of enabling a reduction in the size and weight of the tightening drive source and a reduction in cost, and preventing the mixing of hydraulic oil into drainage and dehydrated products. Has been repeated.
A thing of patent documents 3 is also proposed.

Incidentally, there are filter presses that perform not only filtration / dehydration but also “pressing” by applying a higher pressure in the final stage.
Although the filter press device of Patent Document 2 has many advantages, it is necessary to make the component members of the pantograph-type jack sufficiently strong to withstand “squeezing” when examined carefully. I found the fundamental problem that the manufacturing cost becomes high because of the necessity of the product and the complicated structure.
On the other hand, although the thing of patent document 3 is one solution method, it is necessary to provide an engaging device in a stopper and a movable head (loose head), respectively, and there exists a difficulty that a structure becomes complicated.
In addition, the tightening position of the loose head may change due to changes in filter cloth and diaphragm thickness (elasticity) over time, and the tightening position of the loose head may change mechanically. In the fixed filter press apparatus, there was a possibility that the target dehydrated product may leak.
Also, the shape of the dewatered cake in the filter chamber, the dewatered cake attached to the filter cloth, etc. may change the clamping pressure during filtration and squeezing, but in the filter press devices of Patent Document 2 and Patent Document 3, Since the tightening device is mechanically fixed and the tightening pressure of the filter plate cannot be adjusted even if the tightening pressure is lowered, the tightening pressure cannot be optimized. In particular, when the number of filter plates is large, such a change in tightening pressure appears remarkably, and stable dehydration ability cannot be exhibited over time.

Japanese Examined Patent Publication No. 4-9566 Japanese Patent No. 4135850 Japanese Patent No. 3539310

  Therefore, the main problem of the present invention is to simplify the structure, to reduce the size, and to save space and cost. Furthermore, it is providing the filter press apparatus which can fully endure the high-pressure reaction force which generate | occur | produces at the time of pressing. Furthermore, it is providing the operating method of the filter press which can fully endure not only dehydration but pressing.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A loose head provided between a loose head and a reaction body provided on the outer side of a filter plate at one end in a filter plate group made up of a plurality of filter plates that can be freely opened and closed in the thickness direction of the filter plate. A filter press device provided with a fastening means for linearly moving the filter plate in the thickness direction of the filter plate to fasten the filter plate group with the reaction force body as a support ,
The tightening means is a ball screw, and when the loose head is linearly moved in the filter plate thickness direction by the ball screw, the reaction force body is configured to receive a reaction force from the loose head,
Separately from the ball screw, a reaction force receiving screw rod that moves linearly with respect to the moving direction of the loose head is provided between the loose head and the reaction force body so as to be screwed to the reaction force body. The reaction force body is configured to receive a reaction force that attempts to move the device in the direction opposite to the tightening direction.
The filter press apparatus characterized by the above-mentioned.

(Function and effect)
In the present invention, a reaction force receiving screw rod that receives a reaction force to move the loose head to the side opposite to the tightening direction during squeezing is provided separately from the tightening means including the ball screw . As a result, it has been found that the tightening force by the tightening means is about a fraction of that of the conventional tightening device. Therefore, as compared with the case where the tightening and the reaction force receiver are shared, the structure can be simplified, the size can be reduced, and the space can be saved and the cost can be reduced. Furthermore, it becomes a filter press apparatus that can sufficiently withstand a high-pressure reaction force generated during pressing.

The ball screw can provide a large forward driving force with a small driving force, and provides an advantage that the tightening force can be easily adjusted.

When a screw rod is used as a reaction force receiving screw rod, it can support a large reaction force with a simple structure. Characteristically, when used for a long period of time, the filter plate and filter cloth thickness of the device will change over time. In the case of a threaded rod, the reaction force receiving position can be easily adjusted, so that a stable required tightening force can be obtained over time.

<Invention of Claim 2>
It said counterforce is a filter press apparatus according to claim 1, wherein constituting a common counterforce to the means and said reaction force receiving threaded rod said clamping.

(Function and effect)
A reaction force body can be provided separately for the fastening means and the reaction force receiving screw rod. However, a common reaction force body is advantageous in simplifying the apparatus.

<Invention of Claim 3>
3. The filter press device according to claim 1 , wherein the reaction body can be selected from two modes that are fixed with respect to the ground or movable in the moving direction of the loose head.

(Function and effect)
In particular, in the case of the filter cloth fixing type, it is desirable that the reaction force body is fixed to the ground, and in the case of the filter cloth movement type, the reaction force body can be moved in the moving direction of the loose head.

<Invention of Claim 4 >
The filter press device according to any one of claims 1 to 3 , further comprising an auxiliary tightening mechanism for tightening the filter plate group in a state of being tightened by the tightening device.

(Function and effect)
The tightening pressure varies depending on changes in the conditions over time, such as the thickness of the filter cloth and diaphragm, the shape of the dewatered cake in the filter chamber, and the state of the dehydrated cake adhering to the filter cloth. Leakage may occur. However, if an auxiliary tightening mechanism for further tightening the filter plate group is provided for the tightening device, a necessary tightening pressure can be generated, and a stable filtration operation can be performed over a long period of time.

<Invention of Claim 5>
A loose head provided on the outer side of the filter plate on one side end in a filter plate group consisting of a plurality of filter plates that can be expanded and contracted in the thickness direction of the filter plate, between the loose head and the reaction force body The filter plate group is moved in the direction of the filter plate thickness by the provided clamping means , and the reaction force member is used as a support to tighten the filter plate group .
The tightening means is a ball screw, and at the time of tightening, when the loose head is linearly moved in the filter plate thickness direction by the ball screw, the reaction force body receives a reaction force from the loose head,
Separately from the ball screw, a reaction force receiving screw rod that moves linearly with respect to the moving direction of the loose head is provided between the loose head and the reaction force member by screwing the reaction force member. A method of operating a filter press, wherein a reaction force to be moved to a side opposite to a tightening direction is received by the reaction force body .

(Function and effect)
The same effects as in the case of claim 1 are achieved.

  As described above, according to the present invention, the structure is simplified, miniaturization can be achieved, and space saving and cost reduction can be achieved. Furthermore, the filter press apparatus which can fully endure the high pressure required at the time of pressing can be provided.

It is a top view of the filter press apparatus concerning the present invention. It is a front view of the filter press apparatus concerning the present invention. It is a principal part top view of the fastening stage of the filter press apparatus which concerns on this invention. It is a principal part top view at the time of pressing reaction force receiving after the filter press apparatus which concerns on this invention is clamped. It is explanatory drawing of a differential pressure generation prevention elastic film.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Outline configuration of equipment)
In the apparatus of this example, a pair of main beams 1 and 1 that are spaced apart from each other and parallel to each other are in the longitudinal direction (hereinafter simply referred to as the longitudinal direction means the longitudinal direction of the main beams 1 and 1). Are supported by the support members 2 and 2 and extend in the horizontal direction, and a filter plate group comprising a plurality of filter plates 3, 3... The loose head 4 supported and arranged on the opening direction side of the filter plate groups 3, 3... Is supported. These individual filter plates 3, 3... And the loose head 4 are provided with guide rollers 6, 6, and are configured to travel on the main beams 1, 1 via the guide rollers 6, 6. The adjacent filter plates 3, 3,... And the loose head 4 are connected to each other by tie bolts 5, 5,. Reference numeral 7 denotes a fixed side frame.

  In the present invention, a clamping device 50 is provided on the open frame side (that is, the side opposite to the filter plate side of the loose head 4) with respect to the integral filter plates 3, 3. The attaching device 50 is connected with a carriage 11 that can run on the main beams 1 and 1 as a reaction force (seat) body.

  In the present embodiment, a cart drive rotary drive source such as an electric motor (not shown) is attached to the lower side of the cart 11, and the rotation shaft extends to the lower side of the main beam 1 on one side. A pinion gear (gear) is attached to the existing portion, and a rack is fixed along the longitudinal direction on the lower surface of the main beam on one side, and the pinion gear and the rack are engaged with each other. Accordingly, the carriage 11 is moved on the main beams 1 and 1 as the pinion gear moves while meshing along the lower surface of the rack by appropriately rotating the pinion gear forward and backward by operating the rotational drive source for moving the carriage. It is possible to move back and forth while riding 12, 12,.

  Further, in the apparatus of this example, as the retraction preventing means 70, latching convex portions 71 and 71 are provided on the side surface portions of the main beams 1 and 1, and the carriage 11 can be moved up and down by a reciprocating drive device such as a jack (not shown). The retraction prevention members 72, 72 are attached. By adopting such a configuration, even when the carriage 11 is moved to a predetermined position, the carriage 11 is moved in the backward direction by lowering the backward prevention members 72 and 72 to the front side of the latching projections 71 and 71. The receding prevention members 72 and 72 are caught by the catching convex portions 71 and 71 and are prevented from moving backward. In addition to this, for example, the reverse prevention means proposed in the above-mentioned Japanese Patent Publication No. 4-9566 can be used.

(Outline configuration of equipment)
The tightening device 50 will be described in detail. A tightening ball screw 51 as a tightening means of the present invention is provided at the center in the width direction of the frame 11A of the carriage 11 and is rotated by a ball screw driving means such as an electric motor (not shown). The rod 51a moves forward and backward with respect to the loose head 4. 51b is a screw case.

On the other hand, a pair of pressing reaction force receiving screw rods 52 and 52 as the reaction force receiving screw rods of the present invention are provided on the outer side in the width direction with respect to the ball screw 51 for tightening.
The pressing reaction force receiving screw rods 52 and 52 are screwed into screw cases 52a and 52a fixed to the frame 11A of the carriage 11, while sprockets 52b and 52b are fixed to the rear ends, respectively. An electric rotary drive motor 52d is supported by a bracket 52c that is supported non-rotatingly with respect to the rotation of 52. A sprocket 52e is fixed to the output shaft of the rotary drive motor 52d, and the rotation is screwed through a chain 52f. The rods 52 and 52 are converted into rotation and forward / backward linear motion.

(Tightening method)
Next, a suitable filter plate tightening method using the above-described filter press apparatus will be described.
FIG. 2 shows a state before the filter plate is tightened. To tighten the filter plate, the filter plate groups 3, 3... Are first closed from this state. That is, a rotational drive source (not shown) for moving the carriage is operated to move the carriage 11 toward the filter plate groups 3, 3,..., And the loose head 4 and the filter plate are connected via the tightening device 50 by this moving force. 3, 3...

  When the carriage 11 reaches the predetermined position in this way, the movement of the carriage 11 is stopped, and as shown in FIG. 1, the carriage 11 is moved backward (in the opposite direction to the filter plates 3, 3,. Do not move).

  If the carriage 11 is fixed so as not to move backward, the ball screw 51 for tightening is then actuated, the rod is gradually extended in the fastening direction, and the fixed carriage 11 is used as a reaction force while loosening. The head 4 and the filter plates 3, 3 ... are tightened. After tightening with a predetermined force, the tightening ball screw 51 is stopped.

  Subsequently, the screw rods 52 and 52 that have been retracted relative to the loose head 4 are rotated and advanced along the screw cases 52a and 52a by the drive of the rotational drive motor 52d, and the loose head 4 is moved at the tips of the screw rods 52 and 52. The outer surface is brought into contact with the pressing jaw.

  Thereafter, the tightening ball screw 51 is retracted from the loose head 4 by a predetermined distance, and thereafter, the screw rods 52 and 52 alone support the filtration and squeezing reaction force acting on the loose head 4.

  The tightening position of the loose head 4 may change as the filter cloth is old or new, or the thickness (elasticity) of the filter cloth or diaphragm changes over time. By using the ball screw 51 and the screw rod 52 that move linearly, it is possible to easily cope with changes in the tightening position.

In the pressing process, a diaphragm is provided between the filter plates, separated from the filter chamber, pressure water is supplied between the diaphragm and the filter plate, and the diaphragm is displaced to perform the pressing. As disclosed in Japanese Patent No. 3802015, in addition to the tightening device 50, an auxiliary tightening mechanism 40 that presses and tightens the filter plate 6 in the thickness direction can be provided.

  That is, as mentioned above, the shape of the dewatered cake in the filter chamber, the thickness of the filter cloth (elasticity), and the dehydrated cake attached to the filter cloth change with the passage of time of filtration and squeezing. The clamping pressure between the filter plates 3 decreases. Therefore, this filter press device is provided with an auxiliary tightening mechanism 40 for compensating for this pressure drop and maintaining the tightening force between the filter plates 3.

  One example of the auxiliary tightening mechanism 40 is a device for moving the filter plate 3 at one end of the filter plate group connected to the fixed side frame 7 toward the loose head 4, as shown in FIG. Further, a diaphragm 41 provided between the concave portion 7a on the fixed side frame 7 side of the filter plate 3 and the fixed side frame 7, and a fluid supply means (pump) 42 for supplying pressure fluid (water) to the diaphragm 41, It has.

  The diaphragm 41 attached to the filter plate 3 is expanded by being supplied with pressure water from the pump 42, and pushes the gap between the filter plate 3 and the fixed side frame 7. As a result, the filter plate 3 presses the filter plate 3 adjacent to the loose head 4 toward the loose head 4 and increases the clamping pressure of the filter chamber 43 formed between these filter plates.

  In this way, the filter plates 3 are sequentially pressed against the adjacent filter plates 3, and the tightening pressure of the filter chambers 43 is increased. Therefore, the clamping pressure between the filter plates 3 can be increased in the entire filter plate group.

  The auxiliary tightening mechanism 40 measures the pressing force applied to the filter plate group by the main tightening mechanism 50 using, for example, a load cell, and drives the pump 42 when the measured value falls below a predetermined value ( By providing (not shown), the filter chamber 43 can be driven at an appropriate timing to maintain the tightening force.

  Note that the filter press device presses a large number of filter plates 3 arranged in the thickness direction in a direction in which the filter plates 3 and 3 located at both ends are brought close to each other, and the pressing force is applied to the adjacent filter plates 3. It is transmitted sequentially. Accordingly, since the pressing force is not easily transmitted between the filter plates 3 in the intermediate portion, the clamping pressure acting on the filter chamber 43 is lower in the intermediate portion than at both ends of the filter plate group.

  Therefore, as shown in FIG. 4 of the publication, the auxiliary tightening mechanism 40 may be provided in the middle portion instead of the one end portion of the filter plate group. Furthermore, the configuration shown in FIGS. 5 and 6 of the publication can be employed as the auxiliary tightening mechanism.

  On the other hand, when the frame is opened, the procedure is the reverse of the frame closing process described above, the ball screw 51 is advanced, the screw rods 52 and 52 are retracted, and the tightening ball screw 51 is retracted. After the carriages 72 and 72 are lifted and the carriage 11 is fixed, the carriage 11 is moved in the frame opening direction (opposite to the filter plates 3, 3...), And the loose head 4 and the filter plate 3 are moved accordingly. , 3... Are moved and expanded to open the frame.

  On the other hand, the setting at the time of transition from the tightening by the tightening ball screw 51 to the supporting stage of the pressing reaction force acting on the loose head 4 by only the screw rods 52, 52 is set at an appropriate position in the longitudinal direction where the closing frame force appears. A pressure detecting means, for example, a load cell can be provided, and this can be performed according to the signal.

  By the way, since the above example is an example of the movable carriage system, the carriage 11 is a reaction force (seat) body. On the other hand, in the case of the fixed base method, it goes without saying that a fixed base fixed to the ground may be used as a reaction force (seat) body.

DESCRIPTION OF SYMBOLS 1 ... Main beam, 2 ... Column member, 3 ... Filter board, 4 ... Loose head, 11 ... Dolly, 50 ... Tightening device, 51 ... Tightening ball screw (clamping means), 52 ... Compression reaction force receiving screw rod ( Reaction force receiving screw rod ), 70... Receding prevention means, 71.

Claims (5)

A loose head provided between a loose head and a reaction body provided on the outer side of a filter plate at one end in a filter plate group made up of a plurality of filter plates that can be freely opened and closed in the thickness direction of the filter plate. A filter press device provided with a fastening means for linearly moving the filter plate in the thickness direction of the filter plate to fasten the filter plate group with the reaction force body as a support ,
The tightening means is a ball screw, and when the loose head is linearly moved in the filter plate thickness direction by the ball screw, the reaction force body is configured to receive a reaction force from the loose head,
Separately from the ball screw, a reaction force receiving screw rod that moves linearly with respect to the moving direction of the loose head is provided between the loose head and the reaction force body so as to be screwed to the reaction force body. The reaction force body is configured to receive a reaction force that attempts to move the device in the direction opposite to the tightening direction.
The filter press apparatus characterized by the above-mentioned. It said counterforce is a filter press apparatus according to claim 1, wherein constituting a common counterforce to the means and said reaction force receiving threaded rod said clamping. 3. The filter press device according to claim 1 , wherein the reaction body can be selected from two modes that are fixed with respect to the ground or movable in the moving direction of the loose head. The filter press device according to any one of claims 1 to 3 , further comprising an auxiliary tightening mechanism for tightening the filter plate group in a state of being tightened by the tightening device. A loose head provided on the outer side of the filter plate on one side end in a filter plate group consisting of a plurality of filter plates that can be expanded and contracted in the thickness direction of the filter plate, between the loose head and the reaction force body The filter plate group is moved in the direction of the filter plate thickness by the provided clamping means , and the reaction force member is used as a support to tighten the filter plate group .
The tightening means is a ball screw, and at the time of tightening, when the loose head is linearly moved in the filter plate thickness direction by the ball screw, the reaction force body receives a reaction force from the loose head,
Separately from the ball screw, a reaction force receiving screw rod that moves linearly with respect to the moving direction of the loose head is provided between the loose head and the reaction force member by screwing the reaction force member. A method of operating a filter press, wherein a reaction force to be moved to a side opposite to a tightening direction is received by the reaction force body .

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