JP5383408B2 - Filter press dehydrator - Google Patents

Description

  The present invention relates to a filter press dehydrator in which a filter plate and a diaphragm are arranged to face each other via a pair of filter cloths, and a raw solution is supplied to the filter chamber formed between the pair of filter cloths to be squeezed.

  Conventionally, solid-liquid separation dehydrators in various sludge treatment processes and production facilities such as carbon products and titanium products in water washing plants, human waste treatment plants, municipal sewage treatment plants, industrial wastewater treatment plants, etc. As a filter press dehydrator is widely used.

  As shown in FIG. 13, in Patent Document 1, a plurality of filter chambers 85 in which a pair of filter cloths 83 and 84 are arranged between the filter plates 81 and 82 are arranged in parallel, and the stock solution is press-fitted into each filter chamber 85. Later, a filter press dehydrator that expands the diaphragm 86 and squeezes the undiluted solution to separate the solid and liquid with the filter cloths 83 and 84, and then separates the filter plates 81 and 82 from each other to drop and discharge the dehydrated cake 87 is proposed. Has been.

JP-A-9-155112

  However, in the conventional filter press dehydrator as described above, the dehydrated cake adheres to both the filter cloth on the filter plate side and the diaphragm side after the solid-liquid separation, and after the filter plate is separated, the dehydrated cake is removed from the filter cloth. If the residue of the dehydrated cake does not easily peel off and remains on the surface of the filter cloth, the filter cloth is clogged at an early stage and the filter cloth needs to be replaced frequently.

  In order to eliminate such clogging of the filter cloth, it is conceivable to provide a vibration mechanism that vibrates the filter cloth, and to drop the dehydrated cake from the filter cloth by vibration. The production cost of the dehydrator increases.

  In addition, it is conceivable that an operator manually peels and drops the dehydrated cake attached to the filter cloth, but it is very complicated.

  Therefore, it is conceivable that a scraper is provided facing the surface of the filter cloth and the dewatered cake attached to the surface of the filter cloth is peeled and dropped by moving the filter cloth. However, the dewatered cake adheres to either the filter plate side or the diaphragm side. Therefore, if neither the filter cloth on the filter plate side nor the diaphragm side is provided with a scraper, the dehydrated cake attached to the filter cloth surface cannot be peeled off. Further, in order to surely peel and drop the dehydrated cake, it is necessary to bring the scraper into contact with the surface of the filter cloth, which may damage and damage the surface of the filter cloth.

  The present invention provides a filter press dehydrator in which a dewatered cake can be attached only to either the filter cloth on the filter plate side or the diaphragm side, and the dewatered cake can be easily detached from the filter cloth. Objective.

In order to achieve the above-described object, the filter press dehydrator according to the present invention is characterized in that a filter plate and a diaphragm are arranged to face each other via a pair of filter cloths as described in claim 1 of the claims. A filter press dehydrator for supplying and squeezing a stock solution to a filter chamber formed between the pair of filter cloths, wherein a plurality of corrugated drainage grooves are formed in the vertical direction on the surface of the filter plate. In addition, the gap amount of the filtrate drainage groove formed in the diaphragm is set to be larger than the gap amount of the filtrate drainage groove formed in the filter plate, and the pair of filter cloths are located above the filter chamber. The upper support part provided in the upper part and the lower support part provided in the lower part are stretched in the vertical direction, and each filter cloth is configured to be movable in the vertical direction in a state where the filter plate and the diaphragm are separated from each other. The filter cloth on the side to which the Configured to, filter cloth is that is configured to start moving at a predetermined acceleration from a stopped state.

  When the stock solution is squeezed in the filter chamber, the moisture content of the dehydrated cake decreases and solidifies as the filtrate is discharged. By forming the drainage groove in the vertical direction, the filtrate will flow smoothly from top to bottom, and if the drainage groove is formed in a corrugated shape, the filter cloth will not be caught in the drainage groove and damage to the filter cloth can be prevented. It becomes like this. At this time, a large amount of filtrate flows from the filtrate drainage groove formed in the diaphragm having a larger void volume than the filtrate drainage groove formed on the filter plate, so that the filter cloth on the filter plate side and the filter cloth on the diaphragm side There is a difference in the degree of adhesion of the dehydrated cake. Then, in a state where the filter plate and the diaphragm are separated, the filter cloth on the side on which the dewatered cake is strongly attached is moved downward, and the dehydrated cake is biased downward by starting to move at a predetermined acceleration from the stopped state, It easily comes off from the filter cloth and falls.

  As described above, according to the present invention, the dewatering cake can be attached only to the filter cloth on either the filter plate side or the diaphragm side, and the dewatering cake can be easily detached from the filter cloth. A dehydrator can be provided.

Schematic of filter press dehydrator according to the present invention It is explanatory drawing of a diaphragm, Comprising: (a) is the sectional view on the AA line of a front view, (b) is a front view (A) is a detailed view of the edge of the diaphragm, (b) is an explanatory diagram of the thickness of the diaphragm and the thickness of the rising portion (A) Front view of filter plate, (b) Side view of filter plate (A) Plan view of filter plate, (b) Back view of filter plate It is explanatory drawing of the state which inserted the diaphragm in the filter board, (a) is sectional side view, (b) is a top view, (c) is a back view. (A) is a front view of a stock solution supply member, (b) is a side view of a stock solution supply member It is explanatory drawing of a filtration unit, (a) is the schematic showing the state which the filtration unit opened, (b) is the schematic showing the state where the filtration unit was closed (A) is an explanatory view of a closing plate process, (b) is an explanatory view of a filtration step, (c) is an explanatory view of a pressing step, and (d) is an explanatory view of an open plate / dehydrated cake discharging step. (A) is a front view of a diaphragm according to another embodiment, (b) is a front view of a diaphragm according to another embodiment. Front view of a filter plate according to another embodiment Illustration of conventional filter press dehydrator Cross section of the main part of a conventional filter press dehydrator

  The filter press dehydrator according to the present invention will be described below.

  As shown in FIG. 1, the filter press dehydrator 100 has a pair of guide rails 3 horizontally mounted between a left frame 1 and a right frame 2, and a large number of filtration units 4 are placed on the left frame 1 on the pair of guide rails 3. And slidably mounted in the right frame 2 direction. The right frame 2 is provided with a pressing cylinder 6, and a pressing member 5 is provided at the tip of the rod 6 a of the pressing cylinder 6.

  The plurality of filtration units 4 are connected to adjacent filtration units 4 by link members (not shown), the rightmost filtration unit 4 in FIG. 1 is connected to a filtration unit driving device, and the leftmost filtration unit 4 is a left frame 1. It is connected with the side. When the right end filtration unit 4 moves in the right direction, the filtration unit 4 sequentially moves in the right direction, and the filtration units 4 are separated by a link member at a predetermined interval.

  The movement of the filtration unit 4 is not limited to that described above, and the filtration unit 4 is suspended from a chain (not shown) disposed between sprockets (not shown) provided in the left frame 1 and the right frame 2. Alternatively, the configuration may be such that the filtration unit 4 suspended on the chain is moved by driving the sprocket and moving the chain.

  Between the adjacent filtration units 4, an endless filter cloth 9 stretched between an upper roller 7 as a plurality of upper support portions and a lower roller 8 as a lower support portion is disposed in the vertical direction. .

  With a plurality of filtration units 4 sandwiched between the filter cloths 9 by the pressing cylinders 6 via the pressing members 5, they are pressed from the right frame 2 direction to the left frame 1 direction with a predetermined pressure and closed. A plurality of filter chambers 14 surrounded by the cloth 9 are formed.

  The left frame 1 is provided with a stock solution supply port 15 for supplying a stock solution that is an object to be squeezed into the filter chamber 14 and a filtrate discharge port 16 through which the filtrate compressed in the filter chamber 14 is discharged.

  When the stock solution is supplied into the filter chamber 14 from the stock solution supply port 15 and squeezed by the filtration unit 4, the filtrate is discharged from the filtrate discharge port 16, and when the filtration unit 4 is opened by the filtration unit driving device, a plurality of filtration units are obtained. The dewatered cake dehydrated from between 4 is discharged.

Hereinafter, each of the above-described configurations will be described in detail.
The filtration unit 4 is composed of a pair of diaphragms 20 and a filter plate 30. As shown in FIGS. 2 (a) and 2 (b), in the diaphragm 20, a thick part 21 that functions as a filter frame is integrally formed around a thin part 22 that squeezes the stock solution. The thick part 21 of the diaphragm 20 functions as a sealing surface of the filter chamber 14 by being compressed by two adjacent filter plates. Therefore, there is no need to use a separate seal member, and the number of parts can be reduced.

  As shown in FIG. 2B, a plurality of rectangular filtrate drain grooves 25 having the same center as the center of the diaphragm 20 are formed on the flat surface 22 a and the inclined surface 22 b of the thin portion 22.

  The cross-sectional shape of the drainage groove 25 may be appropriately formed in a rectangular shape, a V shape, an arc shape or the like in consideration of the expansion of the thin portion 22 of the diaphragm 20 in the pressing process of the dewatered cake. The shape may be varied on the inclined surface 22b. Further, the pitch between the adjacent drain grooves 25 may be varied.

  The drainage groove 25 is formed by appropriately setting the shape, width, depth, total length, number, etc. of the groove.

  In the present embodiment, the gap amount of the drainage groove 25 formed in the diaphragm 20 is formed to be larger than the gap amount of the drainage groove formed in the filter plate. In addition, the void amount of the drainage groove means the amount of the drainage groove dug, that is, the amount obtained by integrating the voids formed for draining the filtrate, and the drainage groove shape, width, depth described above. The total length, number, etc. can be set.

  As shown in FIG. 3 (a), the edge of the thin portion 22 is connected to a position separated by a distance d from one end in the thickness direction of the inner periphery of the thick portion 21, and the central portion of the thin portion 22 is thick. It is formed on a flat surface 22a (see FIG. 2) projecting to the other end in the thickness direction of the portion 21, and the flat surface 22a and the edge portion are connected by an inclined surface 22b.

  As shown in FIG. 3B, when the thin portion 22 is moved to squeeze the stock solution in the filter chamber, stress is repeatedly applied to the edge portion 22c of the thin portion 22, but the edge portion 22c is changed to the thick portion 21. By connecting to a position separated by a distance d from one end of the inner circumference in the thickness direction, friction due to contact between the edge 22c where the stress concentration is large and the compression part 31 of the filter plate 30 can be avoided, thereby reducing the risk of breakage. Life can be extended.

  A filtrate discharge passage 26 penetrating in the front-rear direction is formed in the left and right lower portions of the diaphragm 20 so that the filtrate flowing from the drainage groove 25 can pass through.

  The material of the diaphragm 20 is not particularly limited, but the thick portion 21 is subjected to a large pressure that functions as a sealing surface, and the thin portion 22 is moved to squeeze the stock solution. Those having both thicknesses are preferred.

  For example, the diaphragm 20 can integrally form the thick portion 21 and the thin portion 22 by injection molding a polymer compound such as a thermoplastic elastomer. By integrally molding the thick portion 21 and the thin portion 22, the number of components necessary for forming a filter chamber such as a diaphragm installation frame can be reduced. Note that the thick portion 21 is sandwiched by a pressure that can withstand the supply pressure of the stock solution supplied into the filter chamber and functions as a seal surface.

  The diaphragm 20 needs to maintain the function as a movable part that squeezes the stock solution while maintaining the function as a sealing surface, and therefore the hardness when using the elastomer resin is preferably in the range of about JIS A hardness 65 to 90. .

  The thick portion 21 may have a solid structure, or as shown in FIG. 2, a plurality of recesses 24 are formed so as to be alternately front and back, so that the thickness of each portion of the diaphragm 20 is different. By reducing the above, it may be formed so as to prevent a bias in shrinkage during cooling of injection molding.

  As shown in FIG. 4A, one side surface of the filter plate 30 is provided with a compression unit 31 that compresses the stock solution with the adjacent diaphragm 20, and the filtrate compressed in the filter chamber 14 is compressed in the compression unit 31. A plurality of sinusoidal drainage grooves 32a are formed in parallel in the longitudinal direction of water flow, and each drainage groove 32a is connected by a lower connection groove 32b. The connecting groove 32 b is formed to be inclined downward from the center of the filter plate 30 to the left and right sides, and is configured to communicate with a filtrate discharge passage 33 formed at the lower left and right of the filter plate 30.

  What is necessary is just to form the cross-sectional shape of the drainage groove | channel 32a in rectangular shape, V shape, circular arc shape, etc., and may make the pitch with the adjacent drainage groove | channel 32a different.

  In this embodiment, the drainage groove 32a is formed so as to reduce the amount of voids by appropriately setting the shape, width, depth, total length, number, etc. of the groove, compared to the drainage groove 25 formed in the diaphragm 20. Has been.

  Since the drainage groove 25 of the filtrate formed in the diaphragm 20 has a larger amount of voids than the drainage groove 32a of the filtrate formed in the filter plate 30, when the dewatered cake is squeezed in the filter chamber 14, the drainage groove 25 In this case, the amount of filtrate flowing is greater than in the drainage groove 32a. Therefore, the dehydrated cake has a lower moisture content on the diaphragm 20 side than on the filter plate 30 side, increases the contact area, and adheres to the filter cloth 9 on the diaphragm 20 side.

  Further, a filtrate discharge passage 34 is formed below the filtrate discharge passage 33 so as to communicate with the filtrate discharge passage 26 in a state where the diaphragm 20 is fitted into the filter plate 30.

  In the upper left and right of the filter plate 30, a stock solution supply passage 35 penetrating in the front-rear direction is provided, and a concave portion 36 into which the stock solution supply member 40 (see FIG. 7) can be loosely inserted is formed in the peripheral portion of the stock solution supply passage 35. The recess 36 is provided with a packing 36a.

  A pair of slide pieces 45 for mounting on the pair of guide rails 3 are attached to the left and right sides of the filter plate 30.

  As shown in FIGS. 5A and 5B, a rising portion 37 and a mounting surface 38 into which the diaphragm 20 can be fitted are formed on the other side of the back surface of the compression portion 31 of the filter plate 30. The thickness of the rising portion 37 is set to be smaller than the thickness of the diaphragm 20.

  That is, when the diaphragm 20 is fitted and supported on the filter plate 30, the thickness of the thick portion 21 of the diaphragm 20 is larger than the thickness of the rising portion 37, so that the difference in thickness is a compression allowance between adjacent filter plates. It becomes.

  Usually, the pressing force applied by the pressing cylinder 6 is large enough to prevent the stock solution in the filter chamber 14 from leaking out. However, the pressing force by the pressing cylinder 6 is stronger than a predetermined pressure required for sealing the diaphragm 20. Even in this case, when the thick portion 21 of the diaphragm 20 is flush with the rising portion 37 of the filter plate 30, the rising portion 37 supports pressure with the adjacent filter plate 30, so that the thick portion 21 of the diaphragm 20 Since a pressure higher than a predetermined pressure is not applied, it is possible to avoid the possibility of deformation or breakage due to excessive tightening of the thick portion 21, so that the sealing effect of the sealing surface can be stabilized.

  When the diaphragm 20 is compressed by the compression portion 31 of the filter plate 30 adjacent to the mounting surface 38 in a state where the diaphragm 20 is fitted and supported on the mounting surface 38, the left and right rising portions 37 are compressed at a predetermined pressure. It is configured to be. The diaphragm 20 is fixed to the mounting surface 38 with bolts or the like as appropriate.

  Formed below the center of the mounting surface 38 of the filter plate 30 are a pressurized water introduction port 39a and a pressurized water introduction passage 39b for supplying pressurized water for inflating the diaphragm 20 to the compression portion 31 side of the adjacent filter plate.

  As shown in FIGS. 6A, 6B, and 6C, when the diaphragm 20 is fitted into the filter plate 30, the pressurized water is introduced from the pressurized water supply pipe 46 attached to the lower portion of the filter plate 30. It is supplied between the attachment surface 38 and the back surface 23 of the thin portion of the diaphragm 20 through the passage 39b and the pressurized water inlet 39a, and the thin portion 22 of the diaphragm 20 expands toward the compression portion 31 side of the adjacent filter plate 30. It will be.

  In addition, what expand | swells the thin part 22 of the diaphragm 20 to the compression part 31 side of the adjacent filter plate 30 should just be a fluid not only pressurized water, For example, pressurized gas may be sufficient.

  If the filter plate 30 is made by extruding a synthetic resin material such as polypropylene, for example, the conventional metal filter plate is used in terms of strength while taking advantage of the lightness and chemical resistance that are the characteristics of the compatible resin. Is not inferior to The filter plate 30 becomes lighter, the weight of the plurality of filtration units 4 arranged in parallel is reduced, and the filter press dehydrator 100 can be enlarged.

  As shown in FIGS. 7A and 7B, the stock solution supply member 40 includes a stock solution supply pipe 41 that can be inserted into the stock solution supply path 35 and a stock solution supply section 42 that is loosely inserted into the recess 34 of the filter plate 30. The stock solution supply section 42 is formed with a stock solution supply path 43 that branches perpendicularly from the stock solution supply pipe 41 and feeds the stock solution supplied from the stock solution supply pipe 41 into the filter chamber 14.

  The stock solution supply member 40 is positioned so that the stock solution supply member 40 is positioned at a predetermined position with the filter plate 30 into which the stock solution supply member 40 is loosely inserted and the adjacent filter plate being opened. Link members 44a and 44b are attached by bolts 44c.

  As shown in FIGS. 8A and 8B, when the pair of filter cloths 9 are tightened by the adjacent filtration units 4a and 4b, the stock solution supply part 42 of the stock solution supply member 40 is supported by the filter plate 30a. In addition, the stock solution is placed in the filter chamber 14 formed between the thin wall portion 22 of the diaphragm 20a and the compression portion 31 of the filter plate 30b, which is sandwiched between the pair of filter cloths 9a and 9b positioned between the diaphragm 20 and the filter plate 30b. Will be supplied.

  The stock solution supply member 40 is loosely inserted into the recess 34 of the filter plate 30 when the adjacent filtration units 4 a and 4 b are pressed to form the filter chamber 14 between the pair of filter cloths 9. The stock solution supply pipe 41 is accommodated in the stock solution supply path 35 and is configured to be connected to the stock solution supply path 35 of the adjacent filtration unit 4.

  When the stock solution is supplied from the stock solution supply port 15 to the stock solution supply path 35, the stock solution is supplied to each filter chamber 14 via the stock solution supply member 40.

  As shown in FIG. 9, the filter cloth 9 is formed in an endless shape, and is folded by an upper roller 7 provided above the filter chamber and a lower roller 8 provided below, and is paired in a vertical direction. Filter cloth 9a, 9b is comprised so that it may be pinched | interposed between the adjacent filter plates 30, respectively. A guide roller 18 for guiding the filter cloth 9 so as not to contact the filter plate 30 and the diaphragm 20 is provided in the vicinity of each upper roller 7, and the filter cloth 9 is provided with a filter cloth tension provided in the upper frame 17. The apparatus 10 is configured so as not to bend by being tensioned. The arrangement of the rollers is not limited to the above-described one, and can be set as appropriate.

  Further, as shown in FIG. 1, the upper frame 17 is provided with a filter cloth meandering prevention device 11 for preventing the meandering of the filter cloth 9 and a filter cloth driving device 12 for driving the filter cloth 9.

  The filter cloth driving device 12 is configured such that the filter cloth 9a on the diaphragm 20 side moves downward when the filter cloth 9 is driven with the filter plate 30 and the diaphragm 20 constituting the filter chamber 14 open. Therefore, even if the diaphragm 20 and the filter plate 30 constituting the filter chamber 14 are opened in the opening plate / dehydrated cake discharging step, even if the dehydrated cake 19 is not fixed and dropped on the filter cloth 9a on the diaphragm 20 side, the filter cloth 9a. Is moved downward, the dewatered cake attached to the surface of the filter cloth 9a can be peeled and dropped.

  At this time, the filter cloth driving device 12 is configured to start moving the filter cloth 9 at a predetermined acceleration from a stopped state. Here, the predetermined acceleration means that the inertial force acting on the dewatered cake by the acceleration at the start of the movement of the filter cloth exceeds the force adhering to the filter cloth surface of the dehydrated cake, so that the contact surface between the dewatered cake and the filter cloth This is the acceleration above the minimum acceleration at which slipping and peeling can occur. Thus, since the filter cloth 9 is accelerated rapidly and starts moving, the dehydrated cake attached to the surface of the filter cloth 9 is peeled and dropped.

  Even when the dewatered cake is not completely peeled off from the surface of the filter cloth 9a, the dewatered cake 19 is surely peeled when the filter cloth 9a is folded back by the lower roller 8, and can be dropped and removed.

  Further, the cleaning device 13 provided in the upper frame 17 sprays the cleaning liquid supplied from the outside even when the residue of the dewatered cake remains on the surface of the filter cloth 9 or when the filter cloth 9 is clogged. And can be cleaned. In this way, since the entire surface can be cleaned by circulating the filter cloth 9, it is not necessary for the operator to clean the filter cloth 9 for each filtration unit.

  Thus, if the plurality of filter chambers 14 are covered with one filter cloth 9, the entire surface can be efficiently used by circulating the filter cloth 9 by the filter cloth driving device 12. Note that the filter cloth 9 may not be configured to be circulated by the filter cloth driving device 14 using a single endless filter cloth 9. A configuration in which a pair of filter cloths are stretched between the plurality of filtration units 4 and the pair of filter cloths between the filtration units 4 respectively move downward is also possible.

  The filter press dehydrator 100 configured as described above is operated in the order of a closing plate step, a filtration step, a pressing step, and an open plate / dehydrated cake discharging step.

  In the closing plate process, the pressing member 5 is advanced through the rod 6 a of the pressing cylinder 6 to press the plurality of filter plate units 4, and a plurality of portions are interposed between the thin portion 22 of the diaphragm 20 and the compression portion 31 of the filter plate 30. This is a step of forming a filter chamber.

  As shown in FIG. 10 (a), the pressure cylinder 6 is operated with the filter cloth 9 disposed between the adjacent filtration units 4 to advance the pressure member 5 through the rod 6a, and the filtration unit 4 is moved to the left. A plurality of filter chambers 14 are formed between the filter cloths 9 by pressing in the frame 1 direction.

  The filtration step is a step in which the stock solution is pressed into the pair of filter cloths 9 of the filter chamber 14 formed by the closed plate step and filtered.

  As shown in FIG. 10 (b), the stock solution is press-fitted from the stock solution supply port 15 on the left frame 1 side into the filter chamber 14 formed by the closing plate process, and is filtered through the filter cloth 9. The filtrate flowing from the drainage grooves 25 and the drainage grooves 32 a is drained from the filtrate discharge port 16 to the outside of the filter press dehydrator 100.

  The pressing step is a step of compressing and dewatering the residue containing moisture remaining between the filter cloths 9 in the filtration step to form a dehydrated cake.

  As shown in FIG. 10C, pressurized water is supplied from the pressurized water supply pipe 46 to the back surface 23 of the thin wall portion of the diaphragm 20 through the pressurized water introduction path 39b and the pressurized water introduction port 39a, and the diaphragm 20 is connected to the adjacent filter plate 30. The dewatered cake 19 swelled to the compression unit 31 side and remains between the filter cloths 9 is pressed to the compression unit 31 side of the other filter plate 30 to perform compression dehydration.

  If the dewatering cake 19 is sufficiently compressed and dehydrated, the dewatered cake 19 is no longer compressed, and the diaphragm 20 cannot expand, so that the pressurized water does not flow in.

  The plate opening and dewatering cake discharging step is a step of stopping the supply of pressurized water and contracting the diaphragm 20, then retracting the rod 6 a of the pressing cylinder 6, opening each filtration unit 4, and discharging the dewatering cake 19. .

  As shown in FIG. 10D, when each filtration unit 4 is opened, the dewatered cake 19 falls from the filter cloth 9 by its own weight. When the dewatered cake 19 does not fall due to its own weight, it adheres to the filter cloth 9 on the diaphragm 20 side. Therefore, when the filter cloth driving device 12 starts moving the filter cloth 9 at a predetermined acceleration from the stopped state, the movement of the filter cloth 9 starts. The inertial force that acts on the dewatered cake due to the acceleration of time exceeds the force that adheres to the surface of the filter cloth 9 of the dewatered cake, and the contact surface between the dewatered cake and the filter cloth 9 slips, and the dewatered cake peels off from the filter cloth 9 To do. Even when the dewatered cake does not completely peel and fall, the filter cloth 9 is folded back by the lower roller 8 at the lower end of the diaphragm 20, and the dewatered cake 19 attached to the surface of the filter cloth is completely peeled off and removed.

  Hereinafter, another embodiment of the filter press dehydrator according to the present invention will be described. In addition, about the structure of the filter press dehydrator by another embodiment, the same code | symbol is attached | subjected to the structure similar to the above-mentioned embodiment, and description is abbreviate | omitted.

  In the above-described embodiment, the configuration in which the drainage groove 25 is formed on the flat surface 22a and the inclined surface 22b of the thin portion 22 of the diaphragm 20 has been described, but the shape of the drainage groove is not limited thereto.

  As shown in FIG. 11A, the drainage groove 50 may be formed only on the flat surface 22 a of the thin portion 22. Furthermore, instead of the plurality of recesses 24 formed in the thick part 21, a plurality of endless recesses 51 may be alternately formed on the front and back sides.

  Further, as shown in FIG. 11 (b), the shape of the drainage groove is a combination of a linear drainage groove 52 extending radially from the center of the diaphragm 20 and a concentric drainage groove 53 with respect to the radial direction of the diaphragm 20. It may be a shape. In any case, the drainage groove is symmetrical with respect to the center of the diaphragm 20 and is concentric with the radial direction of the diaphragm 20 so that the void amount is larger than that of the filtrate drainage groove formed on the filter plate. It only has to be configured.

  In the above-described embodiment, the structure in which a plurality of sinusoidal drainage grooves 32a are formed in parallel in the vertical direction has been described in the filter plate, but the present invention is not limited thereto.

  As shown in FIG. 12, a configuration in which a plurality of triangular drainage grooves 54 are formed in parallel in the vertical direction may be used, or a sawtooth wave type and a rectangular wave type may be used. In any case, it is only necessary that the filter cloth has a shape that does not easily get caught in the drainage groove, and the gap amount is smaller than that of the drainage groove formed in the diaphragm.

  In any of the above-described embodiments, the case where the drainage groove formed with the diaphragm has a larger void amount than the drainage groove formed on the filter plate has been described. This is because the diaphragm is obtained by injection molding a polymer compound such as a thermoplastic elastomer, so the drain plate can be made once regardless of the shape of the drainage groove, whereas the filter plate is made of polypropylene. Since there is a case where the drainage groove is cut into the extruded material of the synthetic resin such as, if there is a lot of cutting amount and cutting process, the processing cost will increase, so the processing cost of the drainage groove of the filter plate will be reduced For this reason, the drainage groove of the filter plate is configured to have a smaller amount of voids than the drainage groove of the diaphragm.

  Therefore, the drainage groove formed in the diaphragm may be configured so that the gap amount of the drainage groove formed in the filter plate is reduced, and the filter cloth on the filter plate side may be moved downward. Furthermore, the configuration is not limited to the case where all the diaphragms or one of the filter plates has a large amount of gaps. For example, the one in which the gap amount between the diaphragm and the filter plate increases for each adjacent filtration unit alternately. You may comprise so that a filter cloth with much space | gap amount of a drainage ditch may be moved downward.

  Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description. The specific configuration of each part can be appropriately changed and designed within the range where the effects of the present invention are exhibited. Needless to say.

1: left frame 2: right frame 3: guide rail 4: filtration unit 5: pressing member 6: pressing cylinder 6a: rod 7: upper roller 8: lower roller 9: filter cloth 10: filter cloth tensioning device 11: filter cloth meandering Prevention device 12: Filter cloth drive device 13: Cleaning device 14: Filter chamber 15: Stock solution supply port 16: Filtrate discharge port 17: Upper frame 18: Guide roller 19: Dehydrated cake 20: Diaphragm 21: Thick part 22: Thin wall Portion 22a: Flat surface 22b: Inclined surface 22c: Edge portion 23: Back surface of thin portion 24: Recess 25: Drainage groove 26: Filtrate discharge passage 30: Filter plate 31: Compression part 32a: Drainage groove 32b: Connection groove 33: Filtrate discharge passage 34: Filtrate discharge passage 35: Stock solution supply passage 36: Recess 36a: Packing 37: Rising portion 38: Mounting surface 39a: Pressurized water introduction port 39b: Pressurized water introduction passage 40: Stock solution supply member 41: Stock solution supply pipe 2: Stock solution supply unit 43: Stock solution supply path 44a, 44b: Link member 44c: Bolt 45: Slide piece 46: Pressurized water supply pipe 50: Drain groove 51: Concavity 52: Drain groove 53: Drain groove 54: Drain groove 100: Filter press dewatering machine d: Distance

Claims (1)

A filter press dewatering machine in which a filter plate and a diaphragm are arranged to face each other via a pair of filter cloths, and supply and squeeze the stock solution into a filter chamber formed between the pair of filter cloths,
A plurality of corrugated drainage grooves are formed in the vertical direction on the surface of the filter plate, and the gap amount of the filtrate drainage groove formed on the diaphragm is equal to the gap of the filtrate drainage groove formed on the filter plate. Set to be more than the quantity,
The pair of filter cloths are stretched vertically by an upper support part provided above the filter chamber and a lower support part provided below, and each filter cloth is separated from the filter plate and the diaphragm. It is configured to be movable in the vertical direction, and is configured such that the filter cloth on the side to which the dewatered cake is attached moves downward.
A filter press dehydrator configured such that the filter cloth starts to move at a predetermined acceleration from a stopped state.

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