JP5634224B2 - Filter press dehydrator - Google Patents

Description

  The present invention relates to a filter press dewatering device that includes a filter plate and a diaphragm that sandwich a filter cloth to form a filtration chamber and squeeze an object to be squeezed supplied to the filtration chamber.

  Conventionally, various sludge treatment processes such as dewatering sludge generated at water purification plants and sewage treatment plants and separating it into filtrate and cake, or solid-liquid separation processes required in the production process of carbon products, titanium products, etc. Filter press dehydrators are used in the field for solid-liquid separation.

  The filter press dewatering device is configured such that a pair of filter cloths are sandwiched between adjacent filter plates in a state where a plurality of filter plates arranged in a predetermined direction are pressed so as to contact each other along the arrangement direction. Is arranged, the object to be compressed is supplied to the filtration chamber which is a space surrounded by the pair of filter cloths, and the object to be compressed is compressed by the diaphragm disposed in the filtration chamber.

  As shown in FIGS. 11A and 11B, in Patent Document 1, a filter chamber is formed by a filter plate 71, a diaphragm 72, and a filter frame 74 that fixes the diaphragm 72 to the filter plate 71. By press-contacting the filter chamber via a pair of filter cloths, a filtration chamber which is a space surrounded by the filter cloth is formed, and the object to be compressed supplied to the filtration chamber is compressed by expanding the diaphragm 72. A filter press dewatering device is disclosed.

  In the filter plate 71, a compression target supply hole is formed in the thickness direction, and a base part 76 for supplying the compression target supplied to the compression target supply hole to the filtration chamber is installed. The filtrate generated from the compressed object branched and supplied to the filtration chamber flows out from the filtrate discharge groove 73 formed in the filter frame 74, and the thickness of the filter plate 71 through the communication hole 78 formed in the filter plate 71. It is discharged to the filtrate discharge hole 77 formed in the direction.

  Further, in Patent Document 2, as shown in FIG. 12, a pair of filter cloths 81 (81 a, 81 b) are arranged between a plurality of filter plates 80, and the space is surrounded by the pair of filter cloths 81. A filtration chamber 82 is connected to one filter plate 80 forming each filtration chamber 82, and a diaphragm 83 fixed to the filter plate 80 by a filter frame 84 is provided, and from a pressurized water supply port 85 formed in the filter plate 80. A filter press dewatering device that squeezes the object to be squeezed in the filter 82 by expanding the diaphragm 83 with pressurized water supplied between the diaphragm 83 and the filter plate 80 is disclosed.

  The filter plate 80 is provided with a mud supply port 86 and a filtrate discharge port 87 for an object to be squeezed that communicate with each filtration chamber 82 and the other filtration chambers 82. The filtrate that has oozed out from one filter cloth 81a is discharged to the filtrate outlet 87 through the filtrate discharge path 88 formed in the filter plate 80, and the filtrate that has oozed out from the other filter cloth 81b is put into the filter frame 84. It is configured to be discharged to the filtrate discharge port 87 through the formed filtrate discharge portion 89.

Japanese Utility Model Publication No. 5-60506 JP-A-9-155112

  However, in the filter press dewatering device described in Patent Document 1, the diaphragm 72 and the filter frame 74 forming the filter chamber are configured separately from each other, and the contact surface between the filter frame 74 and the pair of filter plates 71 There is a problem that the cost increases due to an increase in the number of parts and an increase in the assembly process, such as a seal member for avoiding leakage of pressurized water for inflating the filtrate and the diaphragm 72 generated in the filtration chamber. .

  Further, the filter plate 71 and the filter frame 74 need to cut the communication hole 78 of the filter plate 71 and the filtrate discharge groove 73 of the filter frame 74, and there is a problem that the manufacturing process increases and the processing cost becomes high. .

  The filter press dewatering device described in Patent Document 2 also requires a filter frame 84 and a seal member, so that the number of components increases, and the filtrate discharge part 87 is formed in the filter frame 84, so that the number of manufacturing steps is increased and processed. There was a similar problem in that the cost was high.

  Further, the filter press dewatering device described in Patent Document 1 has a filtrate discharge groove 73 for guiding and discharging the filtrate to a filtrate discharge hole 77 formed through the filter plate 71 in the thickness direction, and a communication hole 78. Similarly, the filter press dewatering device described in Patent Document 2 also guides and discharges the filtrate to the filtrate outlet 87 formed through the filter plate 80 in the thickness direction. Therefore, it is difficult to secure a sufficient amount of drainage for efficiently discharging the filtrate produced by the squeezing. There was a problem.

  Moreover, since the absolute amount of the filtrate discharge capacity of the filtrate discharge groove 73, the communication hole 78, and the filtrate discharge part 89 is not sufficient, the filtrate discharge groove 73, the communication hole 78, and the filtrate discharge part 89 are provided. There was also a problem that the drainage capacity was reduced due to the blockage.

  An object of the present invention is to provide a filter press dewatering device capable of appropriately and efficiently performing a squeezing process while reducing the number of parts of members constituting the filter chamber.

In order to achieve the above object, the filter press dewatering device according to the present invention is characterized in that, as described in claim 1 of the appended claims, a filter chamber is formed by sandwiching a filter cloth, and the filter chamber a filter press dewatering device provided with a filter plate and the diaphragm squeezing the squeeze object supplied to the diaphragm expands when pressurized fluid is supplied between the hand of the filter plate and a thin portion, the integrally formed around the thin wall portion is constituted by a thick portion that functions as a filter frame, on one surface of the thick portion in contact with the one of the filter plates, the pressurized fluid sealing surface to seal is formed, and the other on the other surface of the thick portion for holding the filter cloth with the filter plate, or filtrate at a site other than the sealing surface of the thick portion is the filtrate in that the filtrate discharge unit capable of discharging is formed to the outside of the frame That.

  According to the above-described configuration, the thick part that functions as the filter frame is integrally formed with the thin part that functions as the diaphragm, so that the filter frame as a separate part becomes unnecessary, and the thick part that contacts one of the filter plates. While securing sufficient sealing performance against pressurized fluid on one side of the other side, the other side of the thick part that sandwiches the filter cloth with the other filter plate, or the sealing side of the thick part is excluded Since an appropriate amount of filtrate is discharged at the time of squeezing by the filtrate discharge part formed at the site, the squeezing process can be performed appropriately and efficiently while reducing the number of parts of the members constituting the filter chamber. Become so.

  For example, as shown in FIGS. 10A and 10B, a filter chamber is formed by the filter plate 90 and the thin wall portion 92 and the thick wall portion 93 of the diaphragm 91, and the filter chamber is surrounded by a pair of filter cloths 98. Forming a filtration chamber. A filtrate discharge part 94 is formed in the filter plate 90, a filtrate discharge part 95 is formed in the thick wall part 93, and the filtrate discharge part 95 is connected to the filtrate discharge part 94 via a communication path 96 formed in the filter plate 90. It is communicated.

  Pressurized water is supplied from the pressurized water supply port formed in the filter plate 90 between the thin wall portion 92 and the filter plate 90, and the compressed object in the filtration chamber is compressed by expanding the thin wall portion with the pressurized water. The filtrate discharged from the filtration chamber is collected in a drain hole 97 formed in the thickness direction of each filter plate 90 through the filtrate discharge portions 94 and 95 and the communication passage 96 and is discharged to the outside.

  Since the sandwiched surface of the thick wall portion 93 sandwiched between the pair of filter plates 90 functions as a sealing surface 99 of pressurized water supplied between the thin wall portion 92 and the filter plate 90, it is necessary to provide a separate sealing member. Therefore, the number of parts can be reduced.

  Furthermore, if the diaphragm is composed of the thick part that functions as the above-mentioned filter frame and the thin part that expands and contracts, it can be manufactured by adopting an injection molding method that fills the mold with synthetic resin. Since the parts can be formed integrally, the manufacturing process is reduced compared to the case of cutting the filtrate discharge part as in the conventional case, wasteful materials can be reduced, and the manufacturing cost is reduced. be able to.

  In the second feature configuration, as described in claim 2, in addition to the first feature configuration described above, a plurality of the filtrate discharge portions are dispersed and formed on the other surface of the thick portion. It is in the point which is a discharge groove.

  According to the above configuration, when the synthetic resin material is integrally formed by injection molding, the thin portion and the thick portion of the diaphragm are once made of gold even if the thin portion, the thick portion, and the filtrate discharge portion have complicated shapes. If a mold is made, it can be easily formed. In particular, the structure of the diaphragm can be simplified by configuring the drainage portion as a drain groove formed on the other surface of the thick portion, not the configuration where the filtrate discharge portion is formed through the thick portion. The manufacturing cost can be reduced.

  Even if the solid matter contained in the filtrate is clogged in the discharge groove and the flow of the filtrate is deteriorated, the discharge groove is formed on the surface of the thick wall portion, so that the cleaning is easy.

  Moreover, since the discharge grooves are formed in a distributed manner on the other surface of the thick wall portion, sufficient filtrate can be discharged without deteriorating the sealing performance of the seal surface against the pressurized fluid formed on the one surface. The amount can be secured, the filtrate can be drained uniformly and quickly from the object to be squeezed, and the dehydration time can be shortened. That is, the filtration performance of the filter press dehydrator can be improved.

  In addition to the first or second feature configuration described above, the third feature configuration may include either one or both of the one filter plate and the other filter plate. When the filter plate is closed, a rising portion where both filter plates abut is formed, the thick portion is formed with a predetermined dimension thicker than the rising portion, and the thick portion is in a state where the rising portion is in contact. It is in a point to be compressed at a predetermined pressure.

  According to the above-described configuration, the thick part is formed to have a predetermined thickness thicker than the rising part, and the difference between the thickness of the thick part and the rising part becomes the compression allowance of the diaphragm, and the pressure at which the thick part of the diaphragm is pressure contacted Can be maintained at a predetermined pressure, so that the sealing effect of the sealing surface can be stabilized.

  In addition to any one of the first to third feature configurations described above, the fourth feature configuration is outside the thick portion when the filter plate is closed. In the portion, there is formed a liquid collection part for collecting the filtrate discharged from the filtrate discharge part and flowing it along the surface of the filter plate.

  According to the above-described configuration, the filtrate discharged from the filtrate discharge portion is collected at the liquid collection portion formed in the portion that is outside the thick portion. Since the liquid collection part is formed outside the thick part, a sufficiently large cross-sectional area can be secured, and the liquid collection part can smoothly flow along the filter plate surface and be discharged.

  In the fifth feature configuration, as described in claim 5, in addition to the fourth feature configuration described above, a concave portion in which the diaphragm is mounted on the one filter plate, and the liquid collecting portion on the outside thereof The rising portion is formed outside the liquid collecting portion, and the filtrate collected in the liquid collecting portion is sealed at the contact surface of the rising portion.

  According to the above-described configuration, the filtrate collected in the liquid collecting part is sealed at the contact surface of the rising part, so that the filter press dewatering device does not leak or scatter from the rising part to the outside of the filter plate. The surroundings can be kept clean.

  In addition to the above-described fourth or fifth feature configuration, the sixth feature configuration includes a drainage hole penetrating in the thickness direction in each filter plate, and The drainage hole is in communication.

  According to the above-described configuration, the filtrate collected in the liquid collection part is discharged collectively from the drain hole formed in communication with the liquid collection part, so that the filtrate flows out from the peripheral part of the filter plate. The drainage structure can be simplified compared with

  In the seventh feature configuration, in addition to any of the fourth to sixth feature configurations described above, the filter cloth is arranged in a vertical position, and It exists in the point arrange | positioned so that a right-and-left end part may be located in the said liquid collection part.

  When the filter cloth is sandwiched between adjacent filter plates, the filter cloth is sandwiched between the filter plates in a pressure contact state, and a strong pressure acts on the filter cloth. If this is repeated, the filter cloth may be damaged. .

  According to the above-described configuration, the left and right end portions of the filter cloth disposed in the up-and-down posture are disposed so as to be positioned in the liquid collection portion, and the filter cloth is not sandwiched between the filter plates. Since the filter cloth is only sandwiched between the thick part of the diaphragm and the filter plate, the risk of breakage can be reduced.

  In the eighth feature configuration, as described in claim 8, in addition to any one of the first to seventh feature configurations described above, one filter unit and one diaphragm constitute one filtration unit. A plurality of filtration units are arranged in parallel so as to be movable between the pressure contact state and the separation state, and the filter plate of one filtration unit becomes the one filter plate, and the filtration unit adjacent to the diaphragm of the one filtration unit. The filter plate of the unit is the other filter plate.

  According to the above-described configuration, one filtration unit is constituted by one filter plate and one diaphragm, and a plurality of filtration units are arranged in parallel so as to be movable between the pressure contact state and the separated state. The filter plate of the filtration unit is the one filter plate, the filter plate of the filtration unit adjacent to the diaphragm of the one filtration unit is the other filter plate, and the diaphragm included in one filtration unit and the filtration The filter plate provided in the filtration unit adjacent to the unit forms the filter chamber by sandwiching the filter cloth, and the filter press dewatering device can be configured with a simple structure.

  As described above, according to the present invention, it is possible to provide a filter press dewatering device capable of appropriately and efficiently performing a squeezing process while reducing the number of parts of members constituting the filter chamber. .

Schematic of filter press dewatering device according to the present invention Explanatory drawing showing the pressure contact state of multiple filtration units Explanatory drawing which shows the separation state of several filtration units Illustration of filter plate, diaphragm and filter cloth (A) is a front view of a filtration unit, (b) is a schematic sectional view explaining a rising part, (c) is a schematic sectional view explaining a rising part of another embodiment, and (d) is a rising part of another embodiment. Schematic sectional view explaining the part It is explanatory drawing of a diaphragm, (a) is a front view, (b) is a rear view, (c) is an AA line end view of the front view, (d) is a B part detailed view of the front view, (e ) Is an end view taken along the line C-C of the B section detail drawing It is explanatory drawing of a filter board, (a) is a front view, (b) is a rear view It is explanatory drawing of the diaphragm by another embodiment, Comprising: (a) is a front view, (b) is a rear view, (c) is a DD line end view of a front view, (d) is the E section detail of a front view Figure, (e) is an end view of line E-F in the detail view of section E (A) is schematic sectional drawing explaining the filtration unit by another embodiment, (b) is schematic sectional drawing explaining the filtration unit by another embodiment, (c) is schematic sectional drawing explaining the filtration unit by another embodiment. It is explanatory drawing of the filter press dehydration apparatus relevant to this invention, Comprising: (a) is explanatory drawing of a filtration unit, (b) is explanatory drawing which shows the press-contact state of several filtration units. It is explanatory drawing of the conventional filter press dehydration apparatus, (a) is explanatory drawing of a filtration unit, (b) is principal part explanatory drawing. Illustration of a conventional filter press dewatering device

  Hereinafter, an example of the filter press dewatering device according to the present invention will be described.

  As shown in FIG. 1, the filter press dewatering device 1 includes a front frame 2, a rear frame 3, and a pair of side frames 4 that are installed between the front frame 2 and the rear frame 3.

  A plurality of filter plates 30 are slidably supported on the pair of side frames 4, and the filter plates 30 are brought into a pressure contact state shown in FIG. 2 and separated states shown in FIG. 3 by an advancing / retracting mechanism 5 installed on the front frame 2. Driven between.

  A driving roller 6 for feeding out the endless filter cloth 7 is disposed on the upper part of the front frame 2, and a cleaning mechanism 8 for cleaning the filter cloth 7 is disposed on the upper part of the rear frame 3.

  The filter cloth 7 fed out by the drive roller 6 is adjusted to a predetermined tension by a tension mechanism 9 similarly installed in the front frame 2, and then the filter surface is opposed by the support mechanisms 10 installed above and below each filter plate 30. Are arranged so as to be guided to the cleaning mechanism 8 after being drawn out from each filter plate 30.

  A pair of engagement pins 11 are provided on the left and right sides of each filter plate 30 so that the engagement pins 11 of a pair of adjacent filter plates 30 are formed in a connecting hole 12 as a link mechanism. Is engaged and connected. In FIG. 1, the left end filter plate 30 is connected to the rear frame 3, and the right end filter plate 30 is connected to the advance / retreat mechanism 5.

  The advance / retreat mechanism 5 is composed of a hydraulic cylinder 5c having a pressing member 5b at the tip of a rod 5a. When the rod 5a is moved forward by the hydraulic cylinder 5c, each filter plate 30 shifts to a pressure contact state pressed toward the rear frame 3 via the pressing member 5b, and when the rod 5a is retracted, the front frame 2 is moved. Each of the filter plates 30 moves toward it, and shifts to a separated state separated by a distance defined by a long hole formed in the connecting fitting 12.

  The filter press dehydrating apparatus 1 performs a filling process in which each filtration chamber is filled with a compression object and a compression process in which the filled compression object is squeezed in a pressure contact state in which the advance / retreat mechanism 5 is advanced.

  Then, in the separated state where the advancing / retreating mechanism 5 is retreated after the squeezing process, the running process of running the filter cloth 7 by a predetermined distance by the drive roller 6 so as to separate the dewatered cake squeezed in each filter chamber from the filter cloth 7 Then, the advance / retreat mechanism 5 is advanced to repeat the same processing. The drive roller 6 is drivingly connected to a drive motor via a speed reduction mechanism, and the drive mechanism is constituted by the drive roller 6, the speed reduction mechanism, and the drive motor.

  The filter cloth 7 fed out from the filter plate 30 is washed by the washing mechanism 8 provided in the rear frame 3 and then passed over the drive roller 6 via the meander correcting mechanism 17.

  A meandering correction mechanism 17 provided between the cleaning mechanism 8 and the driving roller 6 is a mechanism for regulating the traveling position of the filter cloth 7 in the width direction, and is installed on a support frame 18 attached to the upper part of the front frame 2. Yes.

  The tension mechanism 9 applies a predetermined tension to the filter cloth 7. The predetermined tension refers to a tension at which the filter cloth 7 can stably travel due to friction with the driving roller 6. Tension is preferred.

  As shown in FIGS. 4 and 5, in this embodiment, the diaphragm 20 is fixed to each filter plate 30 in a recess 31 formed on one surface along the arrangement direction. As a fixing method, a known method such as using a screw 13 can be appropriately employed. The diaphragm 20 includes a thin portion 21 that can be expanded and contracted and a thick portion 22 that functions as a filter frame integrally formed around the thin portion 21, and is a space partitioned by a back surface of the filter plate 30 adjacent to the diaphragm 20. A chamber is formed.

  The support mechanism 10 includes an upper roller 10a and a lower roller 10b supported by brackets fixed to the filter plates 30, and the filter cloth 7 is stretched in the vertical direction between the adjacent filter plates 30 by both rollers 10a and 10b. ing.

  In the vicinity of the upper roller 10a, a guide roller 10c for guiding the filter cloth 7 so as not to contact the filter plate 30 and the diaphragm 20 when the filter plate 30 is separated is provided.

  When each filter plate 30 shifts to the pressure contact state by the advance / retreat mechanism 5, the space partitioned by the filter cloth 7 in the filter chamber becomes the filtration chamber.

  Each filter plate 30 is formed with a through hole 32 in the thickness direction, a base 14 is provided between the filter plates 30, and the through hole 32 of each filter plate 30 communicates with the base 14 in a pressure contact state. Has been. And a pressing target object is supplied to the said through-hole 32 from the pressing target supply port 15 with which the rear frame 3 was equipped in the press-contact state, and each pressing chamber is filled with a pressing target object through the branch path formed in the nozzle | cap | die 14. Is done.

  Below each filter plate 30, there is provided a pressurized water flow path 33 for supplying pressurized water for inflating the diaphragm 20 attached to the filter plate 30 to the filter chamber side.

  The pressurized water supplied from the pressurized water flow path 33 is discharged between the filter plate 30 and the thin portion 21 of the diaphragm 20 attached to the filter plate 30 from the pressurized water supply hole 34 formed in the recess 31 of the filter plate 30. .

  A pressurized water supply mechanism (not shown) supplies pressurized water as a pressurized fluid to the pressurized water flow path 33, and the thin portion 21 of the diaphragm 20 is inflated toward the filtration chamber so that the compressed object supplied to the filtration chamber. Is squeezed. The pressurized fluid is not limited to pressurized water but may be pressurized air.

  That is, one filter plate 30 provided with the pressurized water flow path 33 and one diaphragm 20 constitute one filtration unit, and a pair of filter cloths 7 are added thereto to form a filtration mechanism. The filtration unit and the pressurized water supply mechanism constitute a squeezing mechanism that squeezes the object to be squeezed that is supplied to the opposing space of the filter surface formed between the filter plates 30 in a pressure contact state.

  The plurality of filtration units are arranged in parallel so as to be movable between the pressure contact state and the separation state, and the filter plate of one filtration unit becomes the one filter plate, and the filtration unit adjacent to the diaphragm of the one filtration unit The filter plate is the other filter plate.

  As shown in FIGS. 6A to 6E, the diaphragm 20 includes a thin portion 21 that can be expanded and contracted, and a thick portion 22 that functions as a filter frame integrally formed around the thin portion 21. . As a result, it is not necessary to use a filter frame for configuring the filter chamber, so that the number of parts can be reduced.

  One surface 22 a of the thick portion 22 of the diaphragm 20 that is in contact with the filter plate 30 functions as a seal surface that seals the pressurized water supplied from the pressurized water channel 33.

  At the four corners of the thick portion 22, openings 22 c are formed through which the screws 13 for fixing the diaphragm 20 to the concave portions 31 of the filter plate 30 are inserted.

  The thick wall portion 22 is formed with a plurality of discharge grooves 22e as filtrate discharge portions discharged from the filtration chamber via the filter cloth 7 on the other surface 22b.

  The discharge groove 22e has an extent that the discharge groove 22e is not blocked by the deformation of the thick part 22 when the thick part 22 is pressed against the filter plate 30, and the surface 22a of the thick part 22 is Any groove may be used as long as it functions sufficiently as a sealing surface.

  For example, the cross-sectional shape of the discharge groove 22e may be U-shaped, V-shaped, rectangular, or the like, and the pitch with the adjacent discharge groove 22e may be varied. The width, depth, number and shape of the discharge groove 22e are set to the optimum values in consideration of the smooth discharge of the filtrate and the size of the solid matter contained in the filtrate.

  That is, since the filtrate discharge part is composed of a plurality of discharge grooves 22e formed on the other surface 22b of the thick part 22, the filtrate can be dispersed in each discharge groove 22e. The solid matter contained in the filtrate is not easily clogged in each discharge groove, and the filtrate can be discharged smoothly. Even if the solid matter contained in the filtrate accumulates in the discharge groove 22e and the flow of the filtrate becomes worse or clogged, the discharge groove 22e is formed on the surface 22b of the thick wall portion 22 so that cleaning is easy. .

  Furthermore, the effective sectional area of the entire discharge groove 22e can be increased without deteriorating the sealing performance of the seal surface with respect to the pressurized fluid formed on the one surface 22a, and a sufficient filtrate discharge amount can be ensured. Thus, the filtrate can be drained uniformly and quickly from the compressed object, and the dehydration time can be shortened. That is, the filtration performance of the filter press dehydrator can be improved.

  One surface 21 a of the thin portion 21 is formed flush with one surface 22 a of the thick portion 22. In this way, a large filter chamber space can be secured, but the surface 21a of the thin portion 21 and the surface 22a of the thick portion 22 do not necessarily have to be flush with each other. By forming the other surface 21b of the thin portion 21 and the other surface 22b of the thick portion 22 to be flush with each other, the surface 21b of the thin portion 21 is flush with the surface 22b when the object to be squeezed is squeezed. Since the elastic force of returning to the position can be used, the squeezing performance can be enhanced. At the center of the other surface 21 b of the thin-walled portion 21, a filtrate passage groove 21 c is formed when the object to be squeezed is squeezed through the filter cloth 7.

  The diaphragm 20 is integrally formed with a thick portion 22 that is pressed against an adjacent filter plate 30 and functions as a filter frame, and a thin portion 21 that expands and contracts in order to squeeze the object to be compressed. Therefore, the diaphragm 20 has appropriate hardness and flexibility. It is preferable that the material is a combination of materials.

  For example, the diaphragm 20 integrally molds the thick portion 22 and the thin portion 21 by injection molding a synthetic resin material such as a thermoplastic elastomer.

  In the present embodiment, the thick portion 22 is formed with a plurality of concave portions 22d on the front and back sides, so that the thickness of each portion of the thick portion 22 is reduced. However, the thick portion 22 may be formed in a solid structure that does not include the concave portion 22d.

  In addition, when the diaphragm 20 is obtained by injection molding a synthetic resin material, even if the liquid passage groove 21c of the thin wall portion 21, the thick wall portion 22 and the filtrate discharge portion have complicated shapes, the mold is once molded. Can be easily molded. In particular, by adopting a configuration in which the discharge groove 22e as the filtrate discharge portion is formed on the other surface 22b of the thick portion 22, the undercut of the mold can be eliminated, so the structure of the mold is simplified. Manufacturing costs can be reduced.

  As shown in FIG. 7 (a), a concave portion 31 for mounting the diaphragm 20 is formed on one surface of the filter plate 30. The recessed portion 31 is formed to be slightly larger than the outer dimension of the diaphragm 20 so that the thick portion 22 of the attached diaphragm 20 is pressed by the adjacent filter plate 30 and can be expanded in the width direction.

  In addition, if the filter plate 30 is made by extruding a synthetic resin material such as polypropylene, for example, the lightness and chemical resistance, which are the characteristics of the compatible resin, are utilized, and sufficient strength according to the use conditions is obtained. You can get a filter plate with

  A pair of slide pieces 4 a for mounting on the pair of side frames 4 are provided on the left and right sides of the filter plate 30.

  As described above, below the filter plate 30, there is provided a pressurized water channel 33 for supplying pressurized water for inflating the diaphragm 20 attached to the recess 31 of the filter plate 30 toward the filter chamber side. The supplied pressurized water is discharged between the filter plate 30 and the diaphragm 20 from the pressurized water supply hole 34 formed in the concave portion 31 of the filter plate 30.

  On the left and right outer sides of the recess 31, a liquid collecting part 35 is formed for collecting the filtrate discharged from the discharge groove 22 e of the diaphragm 20 and flowing it along the surface of the filter plate 30, and is adjacent to the outside of the liquid collecting part 35. A rising portion 36 that contacts the filter plate 30 is formed. The liquid collection part 35 may be formed on the diaphragm 20.

  A lower end portion 35a of the liquid collecting portion 35 is formed one step lower than the liquid collecting portion 35, and a drainage hole 37 penetrating in the thickness direction of the filter plate 30 is formed on the side of the lower end portion 35a. And the drainage hole 37 are communicated with each other via the lower end portion 35a. The filtrate collected in the liquid collection unit 35 is discharged from the drain hole 37 to the outside of the filter press dehydrator 1 through the filtrate discharge port 16 provided in the rear frame 2.

  As shown in FIG. 5A, the left and right end portions of the filter cloth 7 are arranged so as to be positioned in the liquid collection part 35, and the filter cloth 7 is press-contacted by the thick part 22 of the diaphragm 20 and the filter plate 30. Will be.

  When the filter cloth is sandwiched between adjacent filter plates, a strong pressure acts on the filter cloth in the pressure contact state of each filter plate, and if the filter cloth is pulled in this state, the filter cloth is damaged. There was a fear. According to the above-described configuration, the left and right end portions of the filter cloth 7 arranged in the up-and-down posture are arranged so as to be positioned in the liquid collection part 35, and the filter cloth 7 is not sandwiched between the rising parts 36 of the filter plate 30. Since the diaphragm 20 and the filter plate 30 are pressed against each other at a predetermined pressure lower than the pressure of the rising portion 36 of the adjacent filter plate 30, the possibility of breakage can be reduced.

  The rising portion 36 is formed to be thinner than the thick portion 22 of the diaphragm 20 by a predetermined dimension, for example, 1 to 10 mm, preferably 2 to 5 mm. That is, since the thick portion 22 is formed to have a predetermined thickness thicker than the rising portion 36, the thick portion 22 is at a predetermined pressure and the filter cloth 7 with the rising portion 36 in contact with the adjacent filter plate 30. The two sheets are compressed by a distance of a predetermined dimension.

  The liquid collecting part 35 is formed to be thinner than the rising part 36 by a predetermined dimension, for example, 1 to 20 mm, preferably 3 to 10 mm. A filtrate discharge portion having a predetermined size is formed in a state where each filter plate 30 is in pressure contact and the rising portion 36 is in contact with the adjacent filter plate 30. At this time, the filtrate collected in the liquid collection part 35 is sealed by the contact surface of the rising part 36, and therefore does not leak from the side surface of the filter plate 30.

  As shown in FIG. 5B, the rising portion 36a formed on the surface of the filter plate 30a to which the diaphragm 20a is attached and the back surface of the surface of the adjacent filter plate 30b to which the diaphragm 20b is attached are in contact with each other. As shown in FIG. 5C, the diaphragm 20a is attached not only to the structure in which the thick portion 22 of the diaphragm 20a is compressed, but also to the diaphragm 20b of the adjacent filter plate 30b. A structure in which the thick portion 22 of the diaphragm 20a is compressed by contacting the rising portion 36b formed on the back surface of the other surface, and the diaphragm 20a of the filter plate 30a is attached as shown in FIG. 5 (d). The rising portion 36a formed on the surface and the rising portion 36b formed on the back surface of the surface to which the diaphragm 20b of the adjacent filter plate 30b is attached come into contact with each other and the diaphragm 20a Thick portion 22 may be configured to be compressed. In addition, the code | symbol 7 of FIG.5 (b) to FIG.5 (d) shows a filter cloth, and the code | symbol 35 shows a liquid collection part.

  That is, one or both of the one filter plate and the other filter plate is formed with a rising portion where both filter plates abut when the filter plate is closed, and the thick portion is the rising portion. In other words, the thick portion may be compressed with a predetermined pressure while the rising portion is in contact with the rising portion.

  As a result, the thick portion is formed to have a predetermined thickness thicker than the rising portion, and the difference between the thickness of the thick portion and the filter chamber interval regulated by the rising portion becomes the compression allowance of the diaphragm, and the thick portion of the diaphragm is pressed into contact. Since the pressure can be maintained at a predetermined pressure, the sealing effect of the sealing surface can be stabilized, and the effect that damage due to excessive tightening pressure of the thick wall portion can be avoided can be achieved.

  The pressing force applied to each filter plate 30 by the pressing cylinder 5c is sufficient if it is large enough to press the thick portion 22 of the diaphragm 20 and the filter plate 30 so that the object to be compressed in the filter chamber does not leak from the filter chamber. However, even when a pressing force larger than that is applied to each filter plate 30, the rising portion 36 contacts the adjacent filter plate 30 to support the pressing force. Since the portion 22 is not subjected to a pressing force of a predetermined pressure or more, it is possible to prevent the thick portion 22 from being deformed or damaged due to excessive tightening.

  As shown in FIG. 7B, the other surface of the filter plate 30 forms an adjacent diaphragm 20 and a filter chamber, and a plurality of drain grooves 38 are arranged on the surface in order to allow the filtrate to flow downward. The lower end of each drainage groove 38 is communicated with a communication groove 39 formed in the horizontal direction.

  What is necessary is just to form the cross-sectional shape of the drainage groove 38 in U shape, V shape, a rectangular shape, etc., and may make the pitch with the adjacent drainage groove 38 different. The width, depth, number and shape of the discharge groove 38 are set to the optimum values in consideration of the smooth discharge of the filtrate and the size of the solid matter contained in the filtrate.

  The left and right end portions of the communication groove 39 are configured to communicate with the lower end portion 35a of the liquid collecting portion 35 of the adjacent filter plate 30 when the filter plate 30 is pressed. The periphery of the lower end portion 35 a and the drainage groove 38 of the liquid collecting portion 30 is surrounded by a packing 40 so that the filtrate does not leak from the lower end portion of the filter plate 30.

  On the upper left and right sides of the filter plate 30, a recess 41 is formed that can accommodate the base 14 in a pressure contact state of each filter plate. The recess 41 is provided with a packing 42 that seals the gap between the cap 14 and the recess 41 in a state where the cap 14 is accommodated in the recess 41.

  The base 14 includes a supply port that communicates with a through-hole 32 that is formed through the bottom surface of the recess 41 in the thickness direction of the filter plate 30, and a branch passage that branches perpendicularly from the supply port, and is supplied from the through-hole 32. The pressed object is supplied from the supply port to the filtration chamber through the branch path.

  The base 14 is attached to the connecting member 12 so as to be separated from each filter plate 30 in a separated state of each filter plate 30. The base is not limited to the above-described configuration, and a known one can be used.

  With the above configuration, the thick portion functions as a filter frame by integrating the thin portion that expands when pressurized fluid is supplied between the thick portion and one filter plate. It is not necessary to use a filter frame for constituting the chamber, and the pressurized fluid is applied to one surface of the thick part in contact with one filter plate in a state where the thick part is pressed by a pair of filter plates. The seal surface is formed, so that no seal member is required, the number of parts can be reduced, and the other surface of the thick portion to which the other filter plate is pressed, or the seal surface of the thick portion Since a filtrate discharge portion capable of discharging the filtrate is formed in a portion excluding the pressure fluid, a sufficient distance between the seal surface of the pressurized fluid and the filtrate discharge portion is secured, and the pressurized fluid While avoiding the possibility of leakage from the filtrate discharge section, it is possible to secure a filtrate discharge amount. Tapuresu dewatering device can be realized.

  Hereinafter, another embodiment of the filter press dewatering device according to the present invention will be described.

  In the above-described embodiment, the configuration in which the discharge groove 22e is formed as the filtrate discharge portion in the thick portion 22 has been described. However, the shape of the discharge groove 22e is not limited to the above-described configuration, and FIG. A corrugated discharge groove 22e as shown in FIG. A groove formed in a width and shape that can secure a sufficient amount of filtrate discharge when pressed by a filter plate, and has a suitable shape that provides a sufficient sealing effect continuously on the sealing surface of pressurized water Good. In addition, about the structure of each part of the diaphragm shown to Fig.8 (a) to (e), it attaches | subjects the same code | symbol to the structure corresponding to the structure of each part of the diaphragm shown to Fig.6 (a) to (e), and demonstrates it. Omitted.

  In the above-described embodiment, the configuration in which the discharge groove 22e as the filtrate discharge portion is formed on the surface 22b of the thick portion 22 of the diaphragm 20 has been described. However, the filtrate discharge portion is a discharge formed through the thick portion. It may be a hole. It is sufficient that the diameter and the number of holes are sufficient to discharge the filtrate in the pressure contact state of each filter plate 30 and the sealing surface of the surface 22a is an appropriate number of holes and the number of discharge holes so that a predetermined sealing pressure can be obtained. .

  In the embodiment described above, when one surface 21a of the thin portion 21 is formed flush with one surface 22a of the thick portion 22, or the other surface 21b of the thin portion 21 and the thick portion 22 are formed. The other surface 22b of the diaphragm is formed so as to be flush with each other, but the diaphragm has a thin-walled portion formed in a flat plate shape, and the edge of the thin-walled portion is a thick-walled portion that functions as a filter frame. The structure connected with the position spaced apart from the thickness direction both ends of the inner periphery may be sufficient.

  When the diaphragm expands and contracts, stress repeatedly concentrates on the edge of the diaphragm. According to the above configuration, since the edge is connected to a position separated from the end in the thickness direction of the inner periphery of the thick part, it is possible to avoid contact between the edge and the filter plate where stress concentration occurs. The possibility of damage due to wear can be reduced, and the life of the diaphragm can be extended.

  In addition, the diaphragm has an edge of the thin portion connected to one end side in the thickness direction of the thick portion, or is connected to a position separated from both ends, and a central portion of the thin portion is in the thickness direction of the thick portion It may be formed on a flat surface protruding to the other end side, and the flat surface and the edge may be connected by an inclined surface.

  According to the above-described configuration, the squeezing force can be applied in a state where the repulsion due to the elastic force of the thin-walled portion is smaller than when the thin-walled portion is formed in a flat plate shape, while taking the volume of the filter chamber relatively large.

  Furthermore, when discharging the pressurized water used to squeeze the stock solution, the force with which the thin portion returns to the original position can be used as the force for discharging the pressurized water, and the pressurized water is easily discharged.

  In embodiment mentioned above, although the structure provided with the rising part 36 which can insert the diaphragm 20 in the left and right of the other side of the back surface of the compression part 31 of the filter plate 30 was demonstrated, a rising part is not restricted to the right and left of a filter plate, The structure provided in the upper and lower sides may be sufficient. Further, the rising portion may be formed with a small protrusion and a diaphragm holding portion for holding the diaphragm may be separately provided. The rising portion may have any form as long as the compression of the thick portion of the diaphragm can be maintained at a predetermined pressure. May be. Further, when the thick part of the diaphragm can be appropriately pressed by another mechanism, the rising part is not always necessary.

  In the above-described embodiment, the configuration in which the drive roller is provided and the endless filter cloth is movably disposed has been described, but the configuration of the filter cloth is not limited thereto. For example, a configuration may be employed in which a pair of filter cloths are suspended between the filter plates without providing a drive roller for driving the filter cloths.

  The mechanism for moving the filter plate 30 between the pressure contact state and the separation state is not limited to the advance / retreat mechanism provided with the hydraulic cylinder described above, but is disposed between the sprockets provided in the front frame and the rear frame. Even if the filter plate 30 is suspended from the chain, and the sprocket is driven to move the chain, the filter plate 30 suspended from the chain is moved between the pressure contact state and the separated state. Good.

  In the above-described embodiment, as illustrated in FIG. 4, the case where the filter chamber is formed between the facing surfaces of the diaphragm 20 mounted on the filter plate 30 and the filter plate adjacent to the filter plate 30 has been described. The following configuration may be used. As shown in FIG. 9 (a), a filter chamber is formed between the opposing surfaces of the diaphragm 20 and one side of the filter plate 30c by using a flat plate-like filter plate 30c separately from the filter plate 30 to which the diaphragm 20 is mounted. The structure which forms and the filter chamber using a filter frame may be sufficient. As shown in FIG. 9 (b), two diaphragms 20 and two diaphragms 20 are formed by using a structure in which filter chambers are formed on both sides of a flat filter plate 30c, and a filter plate 30d having diaphragms 20 mounted on both sides. The structure which forms a filter chamber between each opposing surface of the flat filter plate 30c may be sufficient.

  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: filter press dewatering device 2: front frame 3: rear frame 4: side frame 4a: slide piece 5: advance / retreat mechanism 5a: rod 5b: pressing member 5c: hydraulic cylinder 7: filter cloth 6: drive roller 8: cleaning mechanism 9 : Tension mechanism 10: support mechanism 10a: upper roller 10b: lower roller 10c: guide roller 11: engagement pin 12: coupling metal 13: screw 14: base 15: pressing object supply port 16: filtrate discharge port 17: meandering Correction mechanism 20: Diaphragm 21: Thin portion 22: Thick portion 22a: Surface 22b: Surface 22c: Opening 22d: Recess 22e: Discharge groove 30: Filter plate 31: Recess 32: Through hole 33: Pressurized water channel 34: Pressurized water supply Hole 35: Liquid collection part 35a: Lower end part 36: Rising part 37: Drainage hole 38: Drainage groove 39: Communication groove 40: Packing 41: Recess 42: Packing

Claims (8)

A filter press dewatering device comprising a filter plate and a diaphragm for sandwiching a filter cloth to form a filtration chamber and squeezing an object to be compressed supplied to the filtration chamber,
The diaphragm is provided with a thin portion that expands when pressurized fluid is supplied between the hand of the filter plate, and a thick portion that functions as a filter frame integrally formed around the thin wall portion Configured ,
A seal surface for sealing the pressurized fluid is formed on one surface of the thick portion that contacts the one filter plate,
Filtrate from which the filtrate can be discharged to the outside of the filter frame on the other surface of the thick portion that sandwiches the filter cloth with the other filter plate, or on the portion of the thick portion excluding the seal surface A filter press dewatering device in which a discharge part is formed.   The filter press dewatering device according to claim 1, wherein the filtrate discharge part is a plurality of discharge grooves formed in a distributed manner on the other surface of the thick part. One or both of the one filter plate and the other filter plate is formed with a rising portion where both filter plates abut when the filter plate is closed,
The thick part is formed to have a predetermined thickness thicker than the rising part,
The filter press dewatering device according to claim 1 or 2, wherein the thick portion is compressed with a predetermined pressure in a state where the rising portion is in contact.   A liquid collection part for collecting the filtrate discharged from the filtrate discharge part and allowing it to flow along the surface of the filter plate is formed in a portion that is outside the thick part when the filter plate is closed. Item 4. The filter press dewatering device according to any one of Items 1 to 3.   The one filter plate is formed with a recess for mounting the diaphragm, and the liquid collection part is formed on the outside thereof. The rising part is formed on the outside of the liquid collection part, and the liquid is collected in the liquid collection part. The filter press dewatering device according to claim 4, wherein the liquid is sealed at a contact surface of the rising portion.   The filter press dewatering device according to claim 4 or 5, wherein a drainage hole penetrating in the thickness direction is formed in each filter plate, and the liquid collection part and the drainage hole are communicated with each other.   The filter press dewatering device according to any one of claims 4 to 6, wherein the filter cloth is disposed in an up-and-down posture, and the right and left ends of the filter cloth are disposed in the liquid collection part. One filtration unit is composed of one filter plate and one diaphragm, and a plurality of filtration units are arranged in parallel so as to be movable between the pressure contact state and the separation state,
The filter according to any one of claims 1 to 7, wherein a filter plate of one filtration unit is the one filter plate, and a filter plate of the filtration unit adjacent to the diaphragm of the one filtration unit is the other filter plate. Press dewatering device.

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