JP4964811B2 - Filter plate support structure - Google Patents

Description

  The present invention relates to a support structure for a filter plate used for concentration of sludge in a water purification plant, a sewage treatment plant, or the like.

  Generally, sludge discharged from a water purification plant or a sewage treatment plant usually contains 90% or more water. Therefore, in treating these sludges, first, dehydration is performed, the sludge is concentrated to reduce the amount, and incineration or landfilling is performed.

  For the sludge dehydration treatment, mechanical dehydration by pressurization or vacuum is generally used. However, these mechanical dehydrations require a large amount of energy for processing. Therefore, using the principle of siphon, the sludge is sucked and adhered to the surface of the filtering means such as filter cloth, and the moisture (filtrate) in the sludge is sucked and concentrated to reduce the energy load in mechanical dehydration. .

  In Patent Document 1 below, as a filter concentration device using the principle of siphon, a filter plate (filter panel) surrounded by a filter cloth net is suspended around the filter chamber in the sludge chamber of the filter tank, and the moisture in the sludge. Is filtered into the filtration chamber, and the filtrate is discharged through the filtrate discharge pipe provided in communication with the filtration chamber. It is disclosed. Moreover, in order to perform a filtration process more efficiently, it is preferable to ensure a large filtration area of the filter plate. Therefore, a plurality of filter plates are often arranged in the filter chamber.

  However, when a plurality of filter plates are arranged in the filter tank, if the filter plate is immersed in sludge and the sludge remains attached to the filter cloth formed of nylon or the like for a long time, the filter cloth swells. In some cases, the filter cloths gradually become loose and adjacent filter cloths come into contact with each other, reducing the filtration area.

Therefore, Patent Document 2 below discloses a filter plate fixing method shown in FIG. 7 in order to prevent adjacent filter cloths from contacting each other. That is, it has a filter plate 20 having a filter cloth 24 and a fixed frame 12 that is disposed on the outer periphery of the filter plate 24 and is fitted in a guide groove formed in the filter tank, and between the filter plate 20 and the fixed frame 12. A plurality of elastic members 37 are interposed therebetween, and both ends of the elastic members 37 are attached to the filter plate 20 and the fixed frame 12, respectively. A plurality of elastic members 37 are arranged over the entire upper, lower, left, and right circumferences of the filter plate 20, and the filter cloth 24 is stretched by the elastic members 37, and the slack of the filter cloth 24 is suppressed.
Japanese Examined Patent Publication No. 62-58762 Japanese Patent Publication No. 3-23203

  The filter cloth 24 constituting the filter plate 20 in Patent Document 2 has an elastic member 37 on the upper side of the filter cloth depending on the weight of sludge that gradually adheres to the filter cloth surface and the nature of the filter cloth 24 that swells due to moisture. While being stretched for a long time, the elastic member 37 on the lower side of the filter cloth may be excessively compressed. For this reason, it will be in the state where the tension | tensile_strength by the elastic member 37 of a filter cloth lower side does not act, it will become difficult to tension the lower side part of the filter cloth 24 with sufficient tension | tensile_strength, and the filter cloth 24 will hang down downward largely. There was a thing.

  As a result, the filter cloth 24 is loosened, fluttering occurs when the sludge is removed, or the filter cloth 24 swells due to elongation due to swelling of the filter cloth 24, and the adjacent filter cloths 24 stick to each other. The area sometimes decreased.

  Accordingly, an object of the present invention is to provide a support structure for a filter plate that can stretch a filter cloth without loosening and can prevent a decrease in the filtration area.

In order to achieve the above object, the filter plate support structure of the present invention has a filter plate in which the outer periphery of the support is covered with a filter cloth formed in a bag shape and the filter cloth is used as a filter chamber. In the support structure of the filter plate that supports a plurality of parallel flat plane portions at a predetermined interval in the vertical direction, a filter frame surrounding the filter plate is disposed on the outer periphery of the filter plate, and the upper side portion of the filter cloth is wherein the suspension support to the upper portion of the filtration frame, wherein the lower portion of the filter cloth attached first weight member, the lower side of the filter cloth are stretched by the weight thereof, both sides of the filtration frame Wire hooking portions are provided at predetermined intervals in the vertical direction on the inner periphery of the section and on both sides of the filter cloth, and the wires supported on the upper side of the filter frame are alternately hooked on both wire hooking portions. is mounted a second weight member at its lower end, of the filter cloth Side portions through the wire being pulled by said second weight member, characterized in that it is stretched in the circumferential both side portions of the filtration frame.

According to the above invention, since the lower side portion of the filter cloth is always pulled downward by the first weight member, the filter cloth can be stretched without being always loosened. For this reason, when the compressed air is blown into the filter chamber and sludge deposited and deposited on the surface of the filter cloth is wiped off, the filter cloth flutters and the chemical fibers constituting the filter cloth swell and the filter cloth itself is deformed due to elongation. The slack of the filter cloth when it occurs can be prevented, and it can be prevented that adjacent filter cloths stick together to reduce the filtration area.
Moreover, since the both sides of the filter cloth are pulled toward the both sides of the filter frame via the wire pulled by the second weight member, the filter cloth can be further prevented from loosening.

  In the support structure of the filter plate of the present invention, it is preferable that the wire hooking portion is constituted by pulleys attached to inner circumferences of both side portions of the filter frame and both side portions of the filter cloth. According to this, since the wire is smoothly pulled by the second weight member by hooking the wire on the pulley, the both sides of the filter cloth can be effectively pulled toward the both sides of the filter frame. .

  In the filter plate support structure of the present invention, the first weight member and / or the second weight member is attached via a connecting member that extends downward through both sides of the lower side of the filter frame. Is preferred. According to this, since the 1st weight member and / or the 2nd weight member are attached via the connection member extended below through the both sides of the lower side part of a filter frame, compressed air etc. are blown in into a filtration chamber. When the sludge that adheres and accumulates on the filter cloth surface is removed, the connecting member passes through both sides of the lower side of the filter frame even if the filter cloth flutters. It can be prevented from moving.

  In the filter plate support structure of the present invention, the first weight member and / or the second weight member may be attached via a connecting member that extends through the lower side of the filter frame and extends downward. preferable. According to this, since the 1st weight member and / or the 2nd weight member are attached via the connection member which penetrates the lower side part of a filtration frame, and is extended below, it blows in compressed air etc. in the filtration chamber. When the sludge deposited on the surface of the filter cloth is wiped off, even if the filter cloth flutters, the connection member penetrates the lower side of the filter frame, so the movement is restricted by the filter frame, and the weight swings greatly. Can be prevented.

  In the support structure of the filter plate of the present invention, the first weight member and / or the second weight member has a reverse U-shaped cross section viewed from the side, and both side walls thereof are lower sides of the filter frame. It preferably extends downward through both sides. According to this, the first weight member and / or the second weight member has an inverted U-shaped cross section viewed from the side, and both side walls extend downward through both sides of the lower side of the filter frame. Therefore, when the compressed air is blown into the filtration chamber to remove the sludge adhering to the surface of the filter cloth, the weight member is arranged so as to straddle both sides of the lower side of the filter frame even if the filter cloth flutters. Therefore, the movement is restricted by the filter frame, and the weight can be prevented from swinging greatly. Further, since the weight has a reverse U-shaped cross section viewed from the side, it is possible to make it difficult for the concentrated sludge to accumulate on the top of the weight when the sludge is peeled off.

  In the support structure for a filter plate of the present invention, it is preferable that the first weight member is connected to the connection member or the filter cloth via an elastic member. According to this, since the first weight member is connected to the connecting member or the filter cloth via the elastic member, even if the elongation of the filter cloth differs depending on each connection place on the lower side of the filter cloth, the load of the weight Can be applied evenly to the filter cloth.

  In the support structure of the filter plate of the present invention, it is preferable that the first weight member is enclosed and attached to a lower side portion of the filter cloth. According to this, by including the first weight member in the lower side portion of the filter cloth, it is possible to omit a space such as a connecting member for attaching the first weight member and to increase a filtration area by the filter cloth. .

  According to the present invention, since the lower side portion of the filter cloth is always pulled downward by the first weight member, the filter cloth can be stretched without being always loosened. For this reason, when the compressed air is blown into the filter chamber and sludge deposited and deposited on the surface of the filter cloth is wiped off, the filter cloth flutters and the chemical fibers constituting the filter cloth swell and the filter cloth itself is deformed due to elongation. The slack of the filter cloth when it occurs can be prevented, and it can be prevented that adjacent filter cloths stick together to reduce the filtration area.

Hereinafter, an embodiment of a support structure for a filter plate of the present invention is described with reference to the drawings. 1 and 2 show a reference example for understanding the support structure of the filter plate according to the present invention. Fig.1 (a) is a schematic block diagram of the sludge concentration processing apparatus using the support structure of the said filter plate, FIG.1 (b) shows the attachment state at the time of attaching a filter plate inside the same process apparatus. It is explanatory drawing. 2A and 2B show a support structure of the filter plate, in which FIG. 2A is an explanatory view showing a schematic configuration thereof, and FIG. 2B is a sectional view taken along the line AA in FIG.

Referring to FIG. 1, the sludge concentrated processor support structure Filtration plates were employed in this 1 (hereinafter, referred to as "processing apparatus 1") will be described the structure of. The treatment apparatus 1 includes a filtration tank 2 for dehydrating and concentrating sludge, a filter plate 20 disposed in the filtration tank 2 for filtering sludge and performing the dehydration process, and the filtration tank 2. And a filtrate storage tank 3 for storing filtrate obtained by dewatering sludge.

  The filtration tank 2 has a bottomed box shape extending in a predetermined direction so that a plurality of filtration plates 20 described later can be arranged in parallel, and the lower part thereof is configured to taper toward the bottom wall. ing. One end of a sludge supply pipe 4 is connected to the lower side wall of the filtration tank 2 and connected to a sludge supply / discharge pump P through a sludge supply / discharge valve V1. Thereby, the sludge supply / discharge pump P is operated and the sludge supply / discharge valve V1 is opened, so that sludge (unconcentrated sludge) can be fed into or extracted from the filtration tank 2. Further, one end of the concentrated sludge extraction pipe 5 is connected to the bottom wall of the filtration tank 2 in communication therewith. A sludge discharge valve V2 is provided in the middle of the concentrated sludge extraction pipe 5. By opening the sludge discharge valve V2, the concentrated sludge can be discharged from the lower part of the filtration tank 2 to the outside.

  On the other hand, a water supply pipe 6 provided with a water supply valve V3 is connected to the bottom wall of the filtrate storage tank 3 disposed outside the processing apparatus so that tap water is supplied. Similarly, a filtrate discharge pipe 7 having a drawing valve V4 disposed in the middle of the pipe line is connected to the bottom wall of the filtrate storage tank 3 so that the filtrate stored in the filtrate storage tank 3 can be discharged to the outside. It has become. In addition, one end of a distribution pipe 9 connected to the filtration plate 20 is connected to the side wall of the filtrate storage tank 3 in communication. An air inflow pipe 8 having an air inflow valve V5 disposed in the middle of the conduit is connected to the upper wall of the filtrate storage tank 3 so as to communicate compressed air from the compressor C connected to the other end. The distribution pipe 9 can be blown.

  Next, a plurality of filtration plates 20 arranged in the filtration tank 2 will be described with reference to FIG. The filter plate 20 includes a support 22 and a bag-shaped filter cloth 24 that covers the outer periphery of the support 22. The support 22 is formed in a rectangular or square shape by a net or mesh net, and has a hollow frame shape having a predetermined rigidity. The bag-like filter cloth 24 covering the outer periphery of the support 22 is folded, for example, by overlapping a pair of rectangular cloth bodies and fixing the peripheral edges, or by bending a single cloth body at a predetermined position. The two sides are overlapped and the peripheral portions are fixed to form a bag shape.

  Then, with the outer periphery of the support 22 covered with the filter cloth 24, a predetermined interval is provided in the width direction (direction perpendicular to the vertical direction), and the support 22 is supported via the seam 26 provided along the vertical direction. A filter cloth 24 is sewn on the body 22. As a result, a filter plate 20 is formed in which a plurality of filter chambers R (see FIG. 2B) that extend vertically and are arranged in the width direction are defined.

  As shown in FIG. 2A, the filter cloth 24 in this embodiment has a substantially rectangular shape having an upper side S1, a lower side S2, and a pair of left and right side parts S3 and S3. Eyelets 28 made of an annular ring are attached to the side portions S1, S2, and S3 of the filter cloth 24 at predetermined intervals.

  Further, pipes 10 extending in a predetermined length are arranged in the upper part of the filter plate 20 along the width direction, and a plurality of through holes (not shown) provided in the pipes 10 are located in the respective filter chambers R. It is like that. A distribution pipe 9 connected to the side wall of the filtrate storage tank 3 is connected to a predetermined position of the pipe 10. The distribution pipe 9 is inserted from the upper side S 1 of the filter plate 20, and a filter frame 30 to be described later. It protrudes from the upper side 31.

  A filter frame 30 surrounding the filter plate 20 is disposed on the outer periphery of the filter plate 20. The filter frame 30 includes an upper side portion 31 and a lower side portion 32 arranged above and below, and a pair of left and right side portions 33 and 33 that connect both ends of the upper side portion 31 and the lower side portion 32, respectively. It has a substantially rectangular frame shape. The side portions 31, 32, and 33 are disposed at predetermined intervals with respect to the side portions S 1, S 2, and S 3 of the filter cloth 24, and the filter plate 20 is disposed in the filter frame 30.

  A plurality of elastic members 37 are disposed between the left and right side portions 33 and 33 of the filter frame 30 and the left and right side portions S3 and S3 of the filter cloth 24. The elastic member 37 of this embodiment is made of a coil spring. Each elastic member 37 has one end hooked on the eyelet 28 of the filter cloth 24 and the other end supported by the side portion 33 of the filter frame 30. As a result, both side portions 33, 33 of the filter frame 30 and both side portions S 3, S 3 of the filter cloth 24 arranged at the corresponding positions are connected via the elastic member 37, and both sides of the filter cloth 24 are connected. The side portions S3 and S3 are stretched around the inner periphery of the side portions 33 and 33 on both sides of the filter frame 30.

  Further, one end of a connecting member 39 such as a shackle is hooked on the eyelet 28 attached to the upper side S1 of the filter cloth 24, and the other end of the connecting member 39 is connected to the upper side 31 of the filter frame 30. It is fixed to. As a result, the upper side S1 of the filter cloth 24 is suspended and supported on the inner periphery of the upper side 31 of the filter frame 30. The connecting member 39 is not particularly specified and may be any member that can withstand the load when the filter plate 20 is suspended. Moreover, it is preferable that the connection member 39 can make the clearance gap between the upper side part S1 of the filter cloth 24, and the upper side part 31 of the filter frame 30 as small as possible.

  As described above, the filter cloth 24 suspended and supported by the upper side portion 31 of the filter frame 30 has the first weight member 50 having a predetermined weight attached to the lower side portion S2, thereby the lower side portion S2 of the filter cloth 24 is stretched. It is set up. Explaining this structure, the plurality of eyelets 28 attached to the lower side portion S2 of the filter cloth 24 have the first connecting member 40 having a shape extending downward through both sides of the lower side portion 32 of the filter frame 30. Several are installed.

  As shown in the partially enlarged view of FIG. 2, the first connecting member 40 is a so-called shackle, a substantially U-shaped main body 41 having a pair of extending portions 41 a and 41 a extending in parallel upward. And a connecting rod 43 inserted and fixed in the holes 41b and 41b at the tip of each extending portion 41a. The connecting rod 43 includes a bolt having a predetermined length and a nut screwed into the bolt.

  Further, as shown in the enlarged view of the same part, the extended portions 41 a and 41 a of the first connecting member 40 are wider than the lower side portion 32 of the filter frame 30, and the lower side portion 32 of the filter frame 30. The tip of the filter cloth 24 extends to reach the lower side S2 of the filter cloth 24. Note that the length of the extending portion 41a varies depending on the size of the filter cloth 24 to be attached, and is determined in consideration of the expansion / contraction width in the vertical direction of the filter cloth 24.

  And the front-end | tip of the extension parts 41a and 41a of the 1st connection member 40 is arrange | positioned at the both sides of the lower side part S2 of the filter cloth 24, and the connection rod 43 is inserted and supported by the hole 41b and the eyelet 28 of the extension part 41a front-end | tip. The first connecting member 40 is attached to the lower side S2 of the filter cloth 24 so as to be swingable in the left-right direction.

  On the other hand, in the case of this embodiment, the first weight member 50 has a horizontally long prismatic shape with a predetermined weight, and a projecting piece 51 having a plurality of hooking holes 51a is projected from its upper end. As described above, one end of an elastic member 37 made of a coil spring is hooked on the bottom of the first connecting member 40, and the other end is hooked on the hooking hole 51 a of the first weight member 50. As a result, the first weight member 50 is attached to the lower side S <b> 2 of the filter cloth 24 via the elastic member 37 and the first connecting member 40.

  As described above, the first weight member 50 is attached to the lower side portion 32 of the filter cloth 24 via the plurality of elastic members 37 and the first connecting member 40. Even if the elongation of the filter cloth 24 differs depending on the connection location, the elastic members 37 on the lower side S2 side of the filter cloth 24 are appropriately expanded and contracted, and the load of the first weight member 50 is reduced by the lower side 32 of the filter cloth 24. Can be applied evenly. Moreover, although the weight of the 1st weight member 50 changes with sizes of the filter cloth 24, it is preferable to set it as the weight which the load of about 1-2 kg acts with respect to the 1st connection member 40. .

  As shown in FIG. 1A, the filtration frame 30 having the above structure is supported and fixed to the inner wall of the filtration tank 2 by predetermined fixing means 11. As the fixing means 11 in this embodiment, as shown in FIG. 1 (b), a pair of guide plates 2 a, 2 a protruding at a predetermined interval on the inner surface of the filtration tank 2, and an upper side portion 31 of the filtration frame 30 The engaging plate 31b is attached to the upper surface of the extending member 31a extending from both sides and is wider than the distance between the guide plates 2a and 2a. And by inserting the upper side 31 of the filter frame 30 between the guide plates 2a and 2a, the engagement plate 31b is engaged with the guide plates 2a and 2a, and the upper side 31 of the filter frame 30 is supported. It is like that.

  A plurality of filtration frames 30 with the filtration plate 20 inward are supported and fixed in the filtration tank 2 via the fixing means 11. As a result, a plurality of filter cloths 24 are supported in the filtration tank 2 in parallel at a predetermined interval with the plane portion thereof directed in the vertical direction.

  Next, a method for concentrating sludge using a sludge concentrator using the filter plate support structure will be described.

  First, the sludge supply / discharge valve V1 is opened, the sludge supply / discharge pump P is operated, and sludge (unconcentrated sludge) to be dehydrated is placed above the filter plate 20 disposed in the filter tank 2. Supply everything. Then, the water supply valve V3 is opened, and the distribution pipe 9, the filtrate storage tank 3, and the filtrate discharge pipe 7 are filled with water. When the water level in the filtrate storage tank 3 rises to a predetermined value, the water supply valve V3 is closed, the water supply to the filtrate storage tank 3 is stopped, and the extraction valve V4 is opened.

  If it does in this way, the negative pressure according to the length of the filtrate discharge pipe 7 will act on each filtration chamber R inside the filter plate 20 by the siphon effect. As a result, water containing unconcentrated sludge in contact with the filter cloth 24 is sucked into the filtration chamber R while being filtered by the filter cloth 24, and the pipe 10 disposed on the upper part of the filter plate 20 and the distribution pipe 9 connected thereto are connected. The filtrate is supplied to the filtrate storage tank 3. In this way, moisture can be filtered out from the unconcentrated sludge. Further, sludge from which moisture has been removed (concentrated sludge) is deposited on the surface of the filter cloth 24.

  At this time, in the conventional method of fixing the filter plate shown in FIG. 7, the elastic member 37 on the lower side of the filter cloth cannot withstand the weight of the sludge adhering to the filter cloth 24, and its tension does not act. The cloth 24 sometimes slackened. On the other hand, in this filter plate support structure, the lower side S2 of the filter cloth 24 is always pulled downward by the first weight member 50, so that the filter cloth 24 can always be stretched without being loosened. It is like that. As a result, when the filter cloth 24 itself stretches and deforms due to chemical fiber swelling or sludge adhesion due to moisture absorption, the filter cloth 24 is prevented from loosening and the adjacent filter cloths 24 stick to each other. It is possible to reliably prevent the filtration area of the filter cloth 24 from being reduced.

  Further, in this filter plate support structure, both side portions S3 and S3 of the filter cloth 24 are stretched on the inner periphery of both side portions 33 and 33 of the filter frame 30 via a first elastic member 37. Therefore, the slack of the filter cloth 24 can be prevented more satisfactorily.

  After performing the said filtration process for the predetermined time, the sludge supply / discharge valve V1 is opened, sludge (unconcentrated sludge) is extracted out of the system of the filtration tank 2, and the extraction valve V4 is closed. Thereafter, the air inflow valve V5 is opened, and compressed air from the compressor C is blown into the filter chambers R of the filter plate 20 through the distribution pipes 9 and 10, thereby inflating the filter cloth 24 and the surface of the filter cloth 24. The concentrated sludge deposited and deposited on the surface can be peeled off.

  As described above, the first weight member 50 is attached via the first connecting member 40 and the elastic member 37 that extend downward through both sides of the lower side portion 32 of the filter frame 30. Therefore, even if compressed air or the like is blown into the filtration chamber R in order to remove the sludge deposited and deposited on the surface of the filter cloth 24 and the filter cloth 24 flutters in the direction shown by the arrow in FIG. Since the extended portion 41 a of the first connecting member 40 abuts on both sides of the portion 32 and the movement of the first connecting member 40 is restricted by the filter frame 30, the first weight member 50 is placed on the plane of the filter plate 20. It is possible to prevent a large swing in the direction orthogonal to the part.

  Then, the concentrated sludge peeled from the filter cloth 24 is discharged out of the filtration tank 2 by opening the sludge discharge valve V2.

FIG. 3 shows a first embodiment of a filter plate support structure according to the present invention. Note that substantially the same parts as those in the reference example are denoted by the same reference numerals and description thereof is omitted. In this support structure, the connection structure of the left and right side portions S3 and S3 of the filter cloth 24 with respect to the left and right side portions 33 and 33 of the filter frame 30 is different from the reference example .

  As shown in FIG. 3, a pulley support member 55 is attached to the left and right side portions S3, S3 of the filter cloth 24 via a grommet 28 with a predetermined distance therebetween, and a pulley is attached to the tip of the pulley support member 55. 56 is rotatably mounted. On the other hand, a pulley support member 55 is fixed to the inner periphery of the left and right side portions 33, 33 of the filter frame 30 at a position corresponding to the pulley support member 55 on the filter cloth 24 side, and a pulley is attached to the tip of the pulley support member 55. 56 is rotatably mounted. The pulley 56 on the filter cloth 24 side and the pulley 46 on the filter frame 30 side are arranged at opposing positions. Further, pulley support members 55 similar to those described above are suspended from both ends of the upper side portion 31 of the filter frame 30, and a pulley 56 is rotatably attached to the lower end thereof.

  As shown in FIG. 3, the upper end portion of the endless wire 57 is hooked on the pulley 56 on the upper side portion 31 of the filter frame 30, and the wire 57 is connected to the pulley 56 and the filter cloth 24 on the filter frame 30 side. The first connecting member 40 is attached to the lower pulley 56 via the connecting rod 43 at the lower end thereof. The bottom portion of the first connecting member 40 is inserted into a hooking hole 71 a formed in a protruding piece 71 projecting from the upper end of the second weight member 70, and the second weight member 70 is interposed via the first connecting member 40. It is hooked on the wire 57.

  As a result, as shown in FIG. 3, the second weight members 70, 70 are arranged on the left and right sides of the horizontally long first weight member 50. Further, the second weight member 70 extends so that the lower end thereof reaches the lower end of the first weight member 50. Therefore, even if the first and second weight members 50 and 70 are swung to the left and right, they collide with each other to prevent excessive weight members 50 and 70 from swinging.

  As described above, in the second embodiment, the side portions 33 and 33 of the filter frame 30 and the side portions S3 and S3 of the filter cloth 24 are alternately drawn along the vertical direction on the plurality of pulleys 56. They are connected via a wire 57 that is hung. By attaching the second weight member 70 to the wire 57, the wire 57 is pulled with a predetermined load and held with a predetermined tension, so that the wire 57 can be prevented from being loosened or loosened. And since the both sides S3 and S3 of the filter cloth 24 are pulled toward the both sides 33 and 33 of the filter frame 30 via the wire 57 pulled by the second weight member 70, the filter cloth 24 is loosened. Can be prevented even better.

  The pulley 56 forms a wire hooking portion in the present invention. Further, the wire hooking portion is not limited to the pulley 56, and for example, a U-shaped hook or the like may be adopted as long as the wire 57 can be hooked.

  Further, in this embodiment, since the pulley 56 that is rotatably supported by the pulley support member 55 is employed as the wire hooking portion, when the wire 57 is pulled by the second weight member 70, it is smoothly pulled. Thus, the side portions S3 and S3 of the filter cloth 24 can be effectively pulled toward the side portions 33 and 33 of the filter frame 30.

4 shows a second embodiment of a support structure of the filter plate according to the present invention is shown. Note that substantially the same parts as those in the reference example and the embodiment are denoted by the same reference numerals, and description thereof is omitted. In this supporting structure, with respect to the first embodiment, first, the second weight member 50 and 70, for applying pulling the lower end of the lower portion S2 and the wire 57 of the filter cloth 24, respectively, connecting members The shape is different.

That is, as shown in FIG. 4, the second connecting member 60, which is the connecting member of the second embodiment, passes through the opening 34 formed through the lower side 32 of the filter frame 30 in the vertical direction. It has a bar shape that extends downward. In addition, insertion holes (not shown) are provided at both upper and lower ends of the rod-shaped second connecting member 60.

  The second connecting member 60 is a member for attaching the first and second weight members 50 and 70 to the lower side S2 of the filter cloth 24 and the lower end of the wire 57 using the connecting tool 65 and the elastic member 37, respectively. It is. Here, the connecting tool 65 has a U-shaped main body 66 and connecting rods 67 inserted and fixed at both ends of the main body 66, and has a shackle structure substantially the same as the first connecting member 40. .

  And the connection tool 65 with which the upper part of the 2nd connection member 60 inserted in the opening part 34 of the filter frame 30 was mounted | worn with the eyelet 28 of the lower side part S2 of the filter cloth 24 via the connection rod 67 is connected. . One end of the elastic member 37 is hooked on the lower end portion of the second connecting member 60 protruding downward from the opening 34, and the first weight member 50 is hooked on the other end of the elastic member 37. . As a result, the first weight member 50 is attached to the lower side S <b> 2 of the filter cloth 24 via the coupler 65, the second coupler 60, and the elastic member 37.

  Similarly, the connection tool 65 attached to the lower end portion of the wire 57 via the connection rod 67 is connected to the upper end portion of the second connection member 60 inserted above the opening 34. Further, another connecting member 65 is connected to the lower end portion of the second connecting member 60 protruding from below the opening 34 via a connecting rod 67, and the second weight member 70 is hooked on the connecting member 65. ing. As a result, the second weight member 70 is attached to the lower end portion of the wire 57 via the second connecting member 60 and the pair of upper and lower connecting members 65.

According to the reference example , both the first weight member 50 and the second weight member 70 are connected to the filter cloth 24 and the wire via the second connecting member 60 that extends through the lower side portion 32 of the filter frame 30 and extends downward. When the filter cloth 24 flutters when the sludge deposited on the surface of the filter cloth 24 is blown off by blowing compressed air or the like into the filtration chamber R, the second connecting member 60 is Since it passes through the lower side portion 32 of the filter frame 30, it can contact the inner periphery of the filter frame 30, its swinging operation is restricted, and the weight members 50, 70 can be prevented from swinging greatly.

FIG. 5 shows a third embodiment of the support structure for the filter plate according to the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. In this support structure, the shapes of the first and second weight members are different from those of the first and second embodiments.

  That is, the first weight member 50a and the second weight member 70a have opposite U-shaped cross sections viewed from the side, and are arranged on both side walls 53, 53, and 73 arranged in parallel at a predetermined interval. 73 extend downward through both sides of the lower side 32 of the filter frame 30.

  Then, one end of the elastic member 37 is hooked on the eyelet 28 of the lower side S2 of the filter cloth 24, the other end is hooked on the hooking hole 51a of the first weight member 50a, and the first weight member 50a is The elastic member 37 is attached to the lower side S2 of the filter cloth 24 through the elastic member 37.

  On the other hand, a connecting tool 65 is attached to the lower end portion of the wire 57 via a connecting rod 67, and the bottom portion of the connecting tool 65 is inserted into the hooking hole 71a of the second weight member 70a. A second weight member 70 a is attached to the lower end portion of the wire 57.

  As described above, each of the weight members 50a and 70a of this embodiment has an inverted U-shaped cross section viewed from the side, and both side walls 53 and 73 pass through both sides of the lower side portion 32 of the filter frame 30. It extends downward. Therefore, when the compressed air or the like is blown into the filtration chamber R and the sludge adhered and deposited on the surface of the filter cloth is removed, the weight members 50a and 70a are attached to the lower side portion 32 of the filter frame 30 even if the filter cloth 24 flutters. Since it is arranged so as to straddle both sides, the movement is restricted by the filter frame 30, and the weight members 50a, 70a can be prevented from swinging greatly. Further, since each of the weight members 50a and 70a has an inverted U-shaped cross section when viewed from the side, it is possible to make it difficult for concentrated sludge to accumulate on the upper portions of the weight members 50a and 70a when the sludge is peeled off.

FIG. 6 shows a fourth embodiment of the filter plate support structure according to the present invention. Note that substantially the same parts as those in the reference example and the embodiment are denoted by the same reference numerals, and description thereof is omitted. This support structure has the same structure as the first embodiment shown in FIG. 3 except that the first weight member mounting structure is different.

  That is, the first weight member 50b in this embodiment has a columnar shape extending in the lateral direction, and is inserted into the lower side portion S2 formed in the tubular shape of the filter cloth 24, so that the lower side portion S2 is inserted. Installed inwardly. According to this embodiment, since the first weight member 50b is included in the lower side S2 of the filter cloth 24, the space for connecting the first weight member 50b and the like is omitted, and the filter cloth The filtration area by 24 can be taken large.

Except for the reference example shown in FIG. 2, both side portions S < b > 3 and S <b> 3 of the filter cloth 24 have a structure stretched by a wire 57, but the characteristic portions of the second to fourth embodiments are described. Further, the present invention may be applied to an embodiment in which the side portions S3 and S3 of the filter cloth 24 are stretched by the elastic member 37. That, (a) of the second embodiment shown in FIG. 4, the first weight member 50 via a connecting member passing through the filtering frame 30 is attached, of the third embodiment shown in (b) FIG. 5, filtered using the first weight member 50a extending downward across the frame 30, it is first weight member 50b is inwardly to the fourth embodiment, the lower side portion S2 of the filter cloth 24 shown in (c) FIG. 6 Can be applied to an embodiment in which both side portions S3 and S3 of the filter cloth 24 are stretched by the elastic member 37, so that another embodiment can be obtained.

(A) is a schematic block diagram of the sludge concentration processing apparatus using the support structure of the filter board of the reference example for understanding the support structure of the filter board of this invention, (b) is the inside of the processing apparatus. It is explanatory drawing which shows the attachment state at the time of attaching a filter plate. The reference example of the support structure of the filter board is shown, (a) is a schematic block diagram, (b) is sectional drawing in the AA arrow line of (a). It is a schematic block diagram which shows 1st Embodiment of the support structure of the filter plate of this invention. It is a schematic block diagram which shows 2nd Embodiment of the support structure of the filter plate of this invention. It is a schematic block diagram which shows 3rd Embodiment of the support structure of the filter plate of this invention. It is a schematic block diagram which shows 4th Embodiment of the support structure of the filter plate of this invention. It is explanatory drawing which shows the support structure of the conventional filter plate.

Explanation of symbols

1 Sludge concentration treatment equipment (treatment equipment)
2 Filtration tank 2a Guide plate 3 Filtrate storage tank 4 Sludge supply pipe 5 Concentrated sludge extraction pipe 6 Water supply pipe 7 Filtrate discharge pipe 8 Air inflow pipe 9 Distribution pipe 10 Pipe 11 Fixing means 12 Fixed frame 20 Filter plate 22 Support body 24 Filter cloth 26 Seam 28 Eyelet 30 Filter frame 31 Upper side 31a Extension member 31b Engagement plate 32 Lower side 33 Side side 34 Opening 37 Elastic member 39 Connection member 40 First connection member 41 Main body 41a Extension part 41b Hole 43 Connection rod 50 50a, 50b First weight member 51 Projection piece 51a Hook hole 53 Side wall 55 Pulley support member 56 Pulley 57 Wire 60 Second connection member 65 Connection tool 66 Main body 67 Connection rod 70, 70a Second weight member 71 Projection piece 71a Pull Hanging hole 73 Side wall C Compressor P Sludge supply / discharge pump R Over chamber S1 Upper side S2 Lower side S3 Side V1 Sludge supply / discharge valve V2 Sludge discharge valve 3 water supply valve V4 withdrawal valve V5 air inlet valve

Claims (7)

The outer periphery of the support is covered with a filter cloth formed in the shape of a bag, and a plurality of filter plates having a filter chamber as an inside of the filter cloth are supported in parallel in a filter tank with a plane portion directed in the vertical direction at a predetermined interval. In the support structure of the filter plate,
A filter frame surrounding the filter plate is disposed on the outer periphery of the filter plate,
The upper side portion of the filter cloth is supported by being suspended from the upper side portion of the filter frame, and a first weight member is attached to the lower side portion of the filter cloth, and the lower side portion of the filter cloth is stretched by its weight. And
Wire hooking portions are provided at predetermined intervals in the vertical direction on both inner sides of the filter frame and on both sides of the filter cloth, and wires supported on the upper side of the filter frame are hooked on both wires. The second weight member is attached to the lower end of the second weight member.
The filter plate support structure , wherein both side portions of the filter cloth are stretched around the inner periphery of both side portions of the filter frame via a wire pulled by the second weight member . The wire pulling hook, the support structure of the filter plate of claim 1, wherein that consists of pulleys attached to both sides of both side portions in the peripheral and the filter cloth of the filter frame. The filter plate support structure according to claim 1 or 2, wherein the first weight member and / or the second weight member is attached via a connecting member that extends downward through both sides of the lower side of the filter frame. . The filter plate support structure according to claim 1 or 2, wherein the first weight member and / or the second weight member is attached via a connecting member that extends through the lower side of the filter frame and extends downward.   The first weight member and / or the second weight member has an inverted U-shaped cross section viewed from the side, and both side walls extend downward through both sides of the lower side of the filter frame. Item 5. The support structure for a filter plate according to any one of Items 1 to 4. The said 1st weight member is a support structure of the filter plate as described in any one of Claims 1-5 connected with the said connection member or the said filter cloth via the elastic member. The support structure for a filter plate according to claim 1 or 2 , wherein the first weight member is enclosed and attached to a lower side portion of the filter cloth.

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