JP7041584B2 - Filter press equipment - Google Patents

Description

The present invention relates to a filter press device.

Conventionally, filter press devices have been used in various fields. In the filter press device, the cake adheres to the filter cloth after filtering and squeezing the slurry. Therefore, for example, a method of peeling off the adhered cake by vibrating the filter cloth is known (see, for example, Patent Document 1). ). In addition, Patent Document 2 discloses a method of peeling a cake by performing compression filtration using a special filter cloth having good elasticity and then pulling the filter cloth to forcibly spread it.

Japanese Patent No. 5796821 Special Fair 6-49122 Gazette

By the way, the method of vibrating the filter cloth to peel off the cake has problems such as noise and scattering of the cake to the surroundings. Therefore, there is a demand for a new method capable of appropriately peeling a cake while suppressing the generation of noise and the like.

Further, depending on the type of slurry, corrosive gas is generated during processing in the filter press device. In this case, in a cylinder mechanism in which a plurality of filter plates are brought into close contact with each other, the surface of the piston rod and the inside of the cylinder body are corroded by corrosive gas, and therefore, a method for suppressing these corrosions is also required.

The present invention has been made in view of the above problems, and an object of the present invention is to appropriately peel off a cake while suppressing the generation of noise and the like, and also to suppress corrosion of the surface of the piston rod and the inside of the cylinder body. There is.

The invention according to claim 1 is a filter press device, in which a plurality of filter plates arranged in a predetermined movement direction and supported so as to be movable in the movement direction, and two adjacent filter plates are used with each other. It has a plurality of filter cloths each covering a plurality of filtration surfaces in the plurality of filter plates, and a moving head and a fixed head arranged so as to sandwich the plurality of filter plates in the moving direction, with the facing surfaces as the filtering surfaces. By moving the moving head in the moving direction, a close contact state in which the moving head and the plurality of filter plates are brought into close contact with each other in the moving direction and a release state in which the close contact state is released are selectively formed. The filter plate opening / closing mechanism, the slurry supply unit that supplies the slurry between the two filter cloths facing each other in the close contact state, and each filtration surface spread in the vertical direction and the width direction perpendicular to the vertical direction. After the separation of one filter cloth and the filter cloth facing the one filter cloth in the released state, one end of the vertical direction is held and the other end is restrained in the one filter cloth. It is provided with a cake peeling mechanism for undulating the one filter cloth by shifting the other end portion in the width direction in the state where the filter cloth is not used.

The invention according to claim 2 is a filter press device, in which a plurality of filter plates arranged in a predetermined movement direction and supported so as to be movable in the movement direction, and two adjacent filter plates are used with each other. It has a plurality of filter cloths each covering a plurality of filtration surfaces in the plurality of filter plates, and a moving head and a fixed head arranged so as to sandwich the plurality of filter plates in the moving direction, with the facing surfaces as the filtering surfaces. By moving the moving head in the moving direction, a close contact state in which the moving head and the plurality of filter plates are brought into close contact with each other in the moving direction and a release state in which the close contact state is released are selectively formed. The filter plate opening / closing mechanism, the slurry supply unit that supplies the slurry between the two filter cloths facing each other in the close contact state, and each filtration surface spread in the vertical direction and the width direction perpendicular to the vertical direction. After the separation of one filter cloth and the filter cloth facing the one filter cloth in the released state, the one end of the one filter cloth is held in the vertical direction, and the other end is held. It is provided with a cake peeling mechanism that undulates the one filter cloth by individually dislocating one end and the other end in the width direction toward the one end side.

The invention according to claim 3 is a filter press device, in which a plurality of filter plates arranged in a predetermined moving direction and supported so as to be movable in the moving direction, and two adjacent filter plates are used with each other. It has a plurality of filter cloths each covering a plurality of filtration surfaces in the plurality of filter plates, and a moving head and a fixed head arranged so as to sandwich the plurality of filter plates in the moving direction, with the facing surfaces as the filtering surfaces. By moving the moving head in the moving direction, a close contact state in which the moving head and the plurality of filter plates are brought into close contact with each other in the moving direction and a release state in which the close contact state is released are selectively formed. The filter plate opening / closing mechanism, the slurry supply unit that supplies the slurry between the two filter cloths facing each other in the close contact state, and each filtration surface spread in the vertical direction and the width direction perpendicular to the vertical direction. After separating one filter cloth and the filter cloth facing the one filter cloth in the released state, the lower end portion, which is the other end portion, is displaced upward while the upper end portion of the one filter cloth is held. It is provided with a cake peeling mechanism that undulates the one filter cloth by allowing the filter cloth to undulate.

The invention according to claim 4 is the filter press apparatus according to any one of claims 1 to 3, wherein when the cake peeling mechanism undulates the one filter cloth, the one filter is used. The filter cloth facing the cloth is also undulated in the same manner as the above-mentioned one filter cloth.

The invention according to claim 5 is the filter press apparatus according to any one of claims 1 to 4, wherein the drive source of the cake peeling mechanism is the drive source of the cake peeling mechanism when viewed along the moving direction. It is provided at a position facing the plurality of filter plates in the width direction.

The invention according to claim 6 is the filter press apparatus according to any one of claims 1 to 5, wherein the cover portion covering at least the drive source in the cake peeling mechanism and the inside of the cover portion are predetermined. It is provided with a purge gas supply unit for supplying the purge gas.

The invention according to claim 7 is the filter press device according to any one of claims 1 to 6, wherein a rod extending in the width direction is attached to the other end of the one filter cloth. The cake peeling mechanism undulates the one filter cloth using the rod.

The invention according to claim 8 is the filter press apparatus according to any one of claims 1 to 7, wherein the cake peeling mechanism is relatively moved in the moving direction with respect to the plurality of filter plates. Further equipped with a moving mechanism.

The invention according to claim 9 is the filter press apparatus according to any one of claims 1 to 8, wherein a plurality of the cake peeling mechanisms are provided with a filtration chamber between two filtration surfaces facing each other. Simultaneously undulate the filter cloth in the filtration chamber.

The invention according to claim 10 is the filter press device according to any one of claims 1 to 9, wherein the filter plate opening / closing mechanism further includes a cylinder mechanism for moving the moving head. The cylinder mechanism has a piston rod fixed to the moving head, a cylinder body that reciprocates the piston rod in the moving direction, and a tubular shape in which the piston rod is arranged inside and can be expanded and contracted in the moving direction. There are an expansion / contraction member that connects the cylinder body and the moving head, and a gas filling portion that fills the inside of the expansion / contraction member with a predetermined gas when the expansion / contraction member expands with the formation of the close contact state. Has.

A related invention of the present invention is a filter press device, in which a plurality of filter plates arranged in a predetermined moving direction and supported so as to be movable in the moving direction, and two adjacent filter plates facing each other. A plurality of filter cloths each covering a plurality of filtration surfaces in the plurality of filter plates, a moving head and a fixed head arranged so as to sandwich the plurality of filter plates in the moving direction, and the moving direction. A cylinder mechanism that selectively forms a close contact state in which the moving head and the plurality of filter plates are brought into close contact with each other in the moving direction and a release state in which the close contact state is released by moving the moving head. A piston rod having a filter plate opening / closing mechanism and a slurry supply unit for supplying slurry between two filter cloths facing each other in the close contact state, the cylinder mechanism being fixed to the moving head, and the piston rod. A cylinder body that reciprocates the piston rod in the moving direction, and a telescopic member that has a cylindrical shape in which the piston rod is arranged and can be expanded and contracted in the moving direction and that connects the cylinder body and the moving head. The telescopic member has a gas filling portion that fills the inside of the stretchable member with a predetermined gas when the stretchable member expands with the formation of the close contact state. In the present invention, corrosion on the surface of the piston rod and the inside of the cylinder body can be suppressed.

In the inventions of claims 1 to 10, the cake can be appropriately peeled off while suppressing the generation of noise and the like.

In the invention of claim 10, corrosion of the surface of the piston rod and the inside of the cylinder body can be suppressed.

It is a figure which shows the structure of the filter press apparatus. It is a figure which shows the filter plate and the filter plate holding mechanism. It is a figure which shows the cylinder mechanism. It is a figure which shows the cylinder mechanism in the state which the telescopic member is extended. It is sectional drawing of a plurality of filter plates. It is a figure which shows the filter cloth and cake peeling mechanism on a filter plate. It is a figure for demonstrating the formation of the peeling process space. It is a figure for demonstrating the cake peeling operation. It is a figure which shows the filter press apparatus of the comparative example. It is a figure which shows another example of a cake peeling mechanism. It is a figure for demonstrating the cake peeling operation. It is a figure which shows another example of a cake peeling mechanism. It is a figure which shows another example of a filter press apparatus. It is a figure which shows another example of a filter press apparatus. It is a figure which shows another example of a cylinder mechanism. It is a figure which shows another example of a cylinder mechanism.

FIG. 1 is a diagram showing a configuration of a filter press device 1 according to an embodiment of the present invention, and is a side view showing the filter press device 1. In FIG. 1, a partial configuration (slurry supply unit 51 and purge gas supply unit 84) of the filter press device 1 is shown by a block. Further, the three directions orthogonal to each other are indicated by arrows as the X direction, the Y direction, and the Z direction (same in other figures). Typically, the X and Y directions are horizontal and the Z direction is vertical.

The filter press device 1 filters and squeezes a mixture (hereinafter referred to as “slurry”) in which various solid particles are mixed in a liquid. The filter press device 1 includes a control unit 100, a plurality of filter plates 2, a plurality of filter cloths 31, a filter plate opening / closing mechanism 4, a slurry supply unit 51, a cake peeling mechanism 6, and a filter plate holding mechanism 7. , The unit moving unit 8 is provided. The control unit 100 is responsible for overall control of the filter press device 1.

Each filter plate 2 has a plate shape parallel to the ZX plane, and a plurality of filter plates 2 are arranged in the Y direction. Further, the plurality of filter plates 2 can be moved in the Y direction. Hereinafter, the Y direction is referred to as a "moving direction". The total number of filter plates 2 is, for example, 3 or more. As will be described later, the filter press device 1 includes two types of filter plates 2a and 2b, that is, a squeezed filter plate 2a and a normal filter plate 2b (see FIG. 5). In the following description, when it is not necessary to distinguish between the squeezed filter plate 2a and the ordinary filter plate 2b, both are simply referred to as “filter plate 2”.

FIG. 2 is a diagram showing a filter plate 2 and a filter plate holding mechanism 7 when viewed along a moving direction. FIG. 2 shows a normal filter plate 2b, and the filter cloth 31 and the cake peeling mechanism 6 are not shown. Each filter plate 2 (squeezed filter plate 2a and ordinary filter plate 2b) includes a filter plate main body 21 having a rectangular plate shape, two upper protrusions 211, and two lower protrusions 212. The upper protruding portion 211 is provided on the upper portion ((+ Z) side portion) of the filter plate main body 21, and the lower protruding portion 212 is provided on the lower portion ((−Z) side portion) of the filter plate main body 21. The two upper projecting portions 211 project from the filter plate main body 21 in the (+ X) direction and the (−X) direction, respectively. The two lower projecting portions 212 project from the filter plate main body 21 in the (+ X) direction and the (−X) direction, respectively. Each upper protruding portion 211 is provided with a through hole 213 extending in the moving direction, and each lower protruding portion 212 is also provided with a through hole 214 extending in the moving direction.

As shown in FIGS. 1 and 2, a pair of sidebars 11 long in the moving direction are provided on both sides of the plurality of filter plates 2 in the X direction (hereinafter, referred to as “width direction”). FIG. 2 shows a cross section of the sidebar 11 on a plane perpendicular to the moving direction. For example, a roller (not shown) is provided on the lower surface of the upper protrusion 211, and the roller comes into contact with the upper surface of the sidebar 11. With the above structure, the plurality of filter plates 2 are supported by a pair of sidebars 11 so as to be movable in the moving direction. Details of other configurations of each filter plate 2 will be described later. At the lower part of each side bar 11, a support bar 111 projecting to the side opposite to the filter plate main body 21 is provided. The support bar 111 extends in the moving direction over almost the entire length of the side bar 11. The sidebar 11 is a part of a support frame 10 (see FIG. 1) that supports the entire filter press device 1.

As shown in FIG. 1, the filter plate opening / closing mechanism 4 includes a moving head 41, a fixed head 42, and a cylinder mechanism 43. The fixed head 42 is arranged on the (+ Y) side of the plurality of filter plates 2 and is fixed to the support frame 10. The moving head 41 is arranged on the (−Y) side of the plurality of filter plates 2 and is supported by a pair of sidebars 11 so as to be movable in the moving direction. The moving head 41 and the fixed head 42 are arranged so as to sandwich the plurality of filter plates 2 in the moving direction.

FIG. 3 is a diagram showing the configuration of the cylinder mechanism 43. The cylinder mechanism 43 is, for example, a hydraulic cylinder, and includes a piston rod 431, a cylinder body 432, an expansion / contraction member 433, and a gas filling portion 434. The tip of the piston rod 431 is fixed to the moving head 41. The cylinder body 432 reciprocates the piston rod 431 in the moving direction. The telescopic member 433 has a cylindrical shape that can be expanded and contracted in the moving direction, and connects the cylinder body 432 and the moving head 41. The telescopic member 433 is, for example, a bellows-shaped member. A piston rod 431 is arranged inside the telescopic member 433. The gas filling portion 434 is connected to the side surface of the end portion of the telescopic member 433 via the connecting pipe 435. The gas filling unit 434 supplies a predetermined gas (as will be described later, gas filled inside the expansion / contraction member 433, hereinafter referred to as “filling gas”) inside the expansion / contraction member 433. The filling gas is, for example, compressed air, and may be a high-pressure inert gas or the like.

In the filter press device 1, when the slurry is processed, the filling gas is constantly supplied to the inside of the expansion / contraction member 433 by the gas filling unit 434, and the inside is filled with the filling gas. In the example of FIG. 3, a plurality of minute holes are formed in the expansion / contraction member 433, and a part of the filling gas in the expansion / contraction member 433 is discharged to the outside from the holes. In the expansion / contraction member 433, a gas discharge port may be provided in place of the hole at the end of the expansion / contraction member 433 on the side opposite to the connection position of the connection pipe 435.

The cylinder mechanism 43 moves the moving head 41 in the moving direction. In the filter press device 1 shown in FIG. 1, by moving the moving head 41 in the (+ Y) direction, a plurality of filter plates 2 are pushed toward the fixed head 42 and are in close contact with each other in the moving direction (to be exact,). The filter cloth 31, which will be described later, is sandwiched between the filter cloths 31 to bring them into close contact with each other.) The state in which the moving head 41, the plurality of filter plates 2 and the fixed head 42 are brought into close contact with each other in the moving direction by moving the moving head 41 in the (+ Y) direction is hereinafter referred to as a "close contact state". As shown in FIG. 4, the expansion / contraction member 433 expands with the formation of the close contact state, and the volume of the expansion / contraction member 433 increases. As described above, the filling gas is constantly supplied from the gas filling portion 434 to the inside of the expansion / contraction member 433, and when the expansion / contraction member 433 expands, the surrounding atmosphere is prevented from entering the inside. As will be described later, in the cylinder mechanism 43, the close contact state and the release state in which the close contact state is released are selectively formed.

FIG. 5 is a cross-sectional view of a plurality of filter plates 2a and 2b at the positions of arrows VV in FIG. In the filter press device 1, two types of filter plates 2a and 2b are provided alternately in the moving direction. One type of filter plate 2a (hereinafter referred to as "squeezing filter plate 2a") further includes two diaphragms 22 in addition to the filter plate main body 21. The two diaphragms 22 are provided on the (+ Y) side surface and the (−Y) side surface of the filter plate main body 21, respectively. A predetermined fluid can be press-fitted into the space between the surface of the filter plate main body 21 and the diaphragm 22, and the press-fitting of the fluid causes the diaphragm 22 to become convex in the direction away from the surface. In FIG. 5, the diaphragm 22 in a convex state is shown by a two-dot chain line.

In each squeezed filter plate 2a, the outer surface (the surface opposite to the filter plate main body 21) of the two diaphragms 22 is covered with the filter cloth 31. In one example of the filter press device 1, a band-shaped filter cloth is hung on the filter plate 2 so as to cover the surface of the two diaphragms 22 and the upper surface of the filter plate main body 21, and is parallel to the width direction on the upper surface. Each of the two parts divided by the dividing line is treated as one filter cloth 31 (the same applies to the filter cloth 31 provided on the ordinary filter plate 2b described later). The upper end of each filter cloth 31 is fixed to the upper surface of the filter plate main body 21. The filter cloth 31 does not overlap the surface of the filter plate main body 21 facing the width direction. In each filter cloth 31 provided on the squeeze filter plate 2a, the portion other than the upper end portion is not fixed to the filter plate main body 21.

At the lower end of the filter cloth 31, a bag-shaped portion 311 extending in the width direction is formed by sewing. A pipe-shaped rod 32 is inserted into the bag-shaped portion 311. In the rod 32, annular members 321 (see FIG. 6 described later) are attached to both outer sides of the filter cloth 31 in the width direction to prevent the rod 32 from moving in the width direction with respect to the filter cloth 31. .. The rod 32 may be attached to the lower end portion of the filter cloth 31 by another method.

The other type of filter plate 2b shown in FIG. 5 (hereinafter referred to as “ordinary filter plate 2b”) further includes two liquid feeding rings 23 in addition to the filter plate main body 21. As shown in FIG. 2, a slurry supply hole 219 and a communication hole 218 are formed in the filter plate main body 21 of the normal filter plate 2b. The slurry supply hole 219 is a through hole extending in the moving direction. The communication hole 218 connects the through hole 213 of one of the upper protrusions 211 and the slurry supply hole 219. As shown in FIG. 5, the two liquid feeding rings 23 are fitted at both ends of the slurry supply hole 219.

Each main surface 25 (hereinafter referred to as “opposing surface 25”) facing the moving direction in the normal filter plate 2b is covered with the filter cloth 31. The upper end of the filter cloth 31 is fixed to the upper surface of the filter plate main body 21. The filter cloth 31 does not overlap the surface of the filter plate main body 21 facing the width direction. In each filter cloth 31 provided on the ordinary filter plate 2b, a hole portion is provided at a position facing the slurry supply hole 219. The periphery of the hole in the filter cloth 31 is sandwiched between the flange portion of the liquid feed ring 23 and the filter plate main body 21 and fixed to the filter plate main body 21. In each filter cloth 31 provided on the ordinary filter plate 2b, the periphery of the hole corresponding to the liquid feed ring 23 and the portion other than the upper end portion are not fixed to the filter plate main body 21. A rod 32 is also provided at the lower end of the filter cloth 31 of the ordinary filter plate 2b in the same manner as the filter cloth 31 of the squeeze filter plate 2a. In the plurality of filter cloths 31 provided on the squeezing filter plate 2a and the ordinary filter plate 2b, the rod 32 is arranged at the same position in the vertical direction.

As shown in FIG. 5, the outer surface of each diaphragm 22 in the squeezing filter plate 2a faces the facing surface 25 of the adjacent ordinary filter plate 2b. Further, both of them spread in the vertical direction and the width direction and are covered with the filter cloth 31. As will be described later, in the processing of the slurry in the filter press device 1, the slurry is filtered and squeezed between the diaphragms 22 facing each other and the facing surfaces 25. That is, the outer surface of the diaphragm 22 and the facing surface 25 are filtration surfaces that come into contact with the slurry via the filter cloth 31. Further, the filtration chamber 20 is located between the two filtration surfaces facing each other with the filter cloth 31 interposed therebetween (that is, between the squeezed filter plates 2a and the ordinary filter plates 2b adjacent to each other).

In the plurality of filter plates 2 in the close contact state, the through holes 213 (see FIG. 2) of the upper protrusion 211 on the (-X) side form one continuous flow path in the moving direction. The slurry supply unit 51 of FIG. 1 is connected to the through hole 213 of the filter plate 2 adjacent to the fixed head 42. When processing the slurry, the slurry supply unit 51 supplies the slurry into the filtration chamber 20 via the flow path, the communication hole 218 of each ordinary filter plate 2b, and the slurry supply hole 219. Similarly, the through hole 213 of the upper protrusion 211 on the (+ X) side also forms one continuous flow path in the moving direction. In the filter press device 1, for example, the fluid used for operating the diaphragm 22 is supplied to each squeezing filter plate 2a via the flow path. Further, the through hole 214 of the lower protrusion 212 on the (-X) side and the through hole 214 of the lower protrusion 212 on the (+ X) side also form a continuous flow path in the moving direction. These channels are used, for example, to recover the filtrate from the filtration chamber 20.

As shown in FIG. 1, the unit moving portion 8 includes a base portion 81 and a moving mechanism 82. As shown in FIG. 2, the base portion 81 has a portal shape straddling the filter plate 2. The base portion 81 includes two leg portions 811 and a bridge portion 812. The two legs 811 are arranged on the (+ X) side and the (-X) side of the filter plate 2, respectively. The bridge portion 812 connects the upper ends of the two legs 811. A roller 813 is provided at the lower end of each leg 811, and the roller 813 comes into contact with the upper surface of the support bar 111. The base portion 81 is movably supported in the moving direction by a pair of support bars 111. The moving mechanism 82 of FIG. 1 includes, for example, a motor, a sprocket, a roller chain (or a rubber timing belt), and the like. By driving the motor, the roller chain circulates and moves, and the base portion 81 connected to a part of the roller chain moves in the moving direction. The cake peeling mechanism 6 and the filter plate holding mechanism 7 are fixed to the base portion 81 and move in the moving direction together with the base portion 81.

FIG. 6 is a diagram showing a filter cloth 31 and a cake peeling mechanism 6 on the filter plate 2 (ordinary filter plate 2b) when viewed along the moving direction. The cake peeling mechanism 6 includes a pair of filter cloth extrusion portions 60. The pair of filter cloth extrusions 60 are attached to the two legs 811 of the base 81, respectively. Each filter cloth extrusion portion 60 includes a cylinder mechanism 61, a cylinder support portion 62, an arm 63, and an arm support portion 64. The cylinder mechanism 61 is, for example, an air cylinder, and includes a piston rod 611 and a cylinder body 612. The cylinder body 612 reciprocates the piston rod 611. The cylinder support portion 62 is fixed to the side surface of the leg portion 811 facing outward in the width direction (X direction). Further, the cylinder support portion 62 rotatably supports the end portion of the cylinder body 612 opposite to the piston rod 611 about an axis parallel to the moving direction (Y direction).

The arm 63 is L-shaped and includes a first portion 631 extending substantially in the vertical direction and a second portion 632 extending outward in the substantially width direction from the upper portion of the first portion 631. The end portion of the second portion 632 opposite to the first portion 631 is rotatably connected to the tip of the piston rod 611 about an axis parallel to the moving direction. The arm support portion 64 is fixed to the lower end surface of the leg portion 811. Further, the arm support portion 64 rotatably supports the portion of the arm 63 where the first portion 631 and the second portion 632 are connected with respect to an axis parallel to the moving direction. An extrusion block 633 is attached to the end of the first portion 631 opposite to the second portion 632. The extrusion block 633 extends in the moving direction and is fixed to the inside of the first portion 631 (the filter cloth 31 side) in the width direction.

In each filter cloth extrusion portion 60, the cylinder mechanism 61, which is a drive source, pushes out the piston rod 611, so that the arm 63 rotates about a fulcrum by the arm support portion 64, as shown by a two-dot chain line in FIG. The extrusion block 633 moves toward the lower end of the filter cloth 31. In the standby state in the cake peeling mechanism 6, the piston rod 611 is pulled into the cylinder body 612, and the extrusion block 633 is located at a position distant from the filter cloth 31 outward in the width direction (at a position shown by a solid line in FIG. 6). Yes, it is placed in the "standby position") below.

As shown in FIG. 2, the filter plate holding mechanism 7 has two advancing / retreating mechanisms 71. The two advancing / retreating mechanisms 71 are attached to the two leg portions 811 of the base portion 81, respectively. Each advance / retreat mechanism 71 has, for example, an air cylinder. The advancing / retreating mechanism 71 advances / retreats the support member 72 with respect to the side surface of the filter plate 2. The upper protruding portion 211 of the filter plate 2 is provided with an engaging portion 215 that can be engaged with the support member 72. The filter plate holding mechanism 7 moves the two support members 72 to the filter plate 2 side and engages with the two engaging portions 215, so that the filter plate 2 is held by the filter plate holding mechanism 7.

In the filter press device 1, most of the filter cloth extrusion portion 60 and most of the advancing / retreating mechanism 71 are housed inside the box-shaped cover portion 83. Specifically, as shown in FIG. 6, in the filter cloth extrusion portion 60, the cylinder mechanism 61, the cylinder support portion 62, the second portion 632 of the arm 63, and the arm support portion 64 are arranged inside the cover portion 83. Will be done. In FIG. 6, the cover portion 83 is shown by a broken line (same in FIG. 2). The cover portion 83 is formed with a slit for avoiding contact with the rotating arm 63, and the first portion 631 of the arm 63 and the extrusion block 633 are arranged outside the cover portion 83.

Further, in the cover portion 83, a hole portion is formed at a position facing the support member 72 (see FIG. 2) of the advancing / retreating mechanism 71. This makes it possible to engage the support member 72 with the engaging portion 215 of the filter plate 2 while arranging almost the entire advancing / retreating mechanism 71 inside the cover portion 83. As shown in FIG. 1, a purge gas supply unit 84 is connected to the cover unit 83, and a predetermined purge gas is supplied to the inside of the cover unit 83 by the purge gas supply unit 84. The purge gas is, for example, compressed air, and may be an inert gas or the like. By supplying the purge gas, the inside of the cover portion 83 is maintained at a pressure higher than the atmospheric pressure (positive pressure).

When the filter press device 1 processes the slurry, first, the filter plate opening / closing mechanism 4 of FIG. 1 moves the moving head 41 in the (+ Y) direction, so that the plurality of filter plates 2 are brought into close contact with each other. .. As shown in FIG. 5, the plurality of filtration surfaces in the plurality of filter plates 2 (that is, the diaphragm 22 of the squeezing filter plate 2a and the facing surface 25 of the ordinary filter plate 2b) are each covered with the plurality of filter cloths 31. ing. Subsequently, the slurry is supplied by the slurry supply unit 51 between the two filter cloths 31 facing each other through the slurry supply hole 219 of the ordinary filter plate 2b, and the slurry is filtered by the filter cloth 31. The liquid that has passed through the filter cloth 31 moves to the lower part of the filtration chamber 20 through the plurality of grooves formed in the diaphragm 22 and the facing surface 25, and is collected at the collection port provided in the lower part (described later). Same as when squeezing).

Subsequently, in the squeezing filter plate 2a, the diaphragm 22 becomes convex toward the facing surface 25 by press-fitting the fluid into the space between the diaphragm 22 and the filter plate main body 21. As a result, the slurry in the filtration chamber 20 is squeezed. When the squeezing of the slurry is completed, the fluid between the diaphragm 22 and the filter plate main body 21 is removed, and the diaphragm 22 returns to the filter plate main body 21 side. By squeezing the slurry, a solid substance, that is, a cake remains in each filtration chamber 20. After that, the moving head 41 moves in the (−Y) direction by a predetermined set distance L (see FIG. 7 described later) by the filter plate opening / closing mechanism 4. As a result, the released state in which the close contact state is released is formed.

When the released state is formed, the moving mechanism 82 of FIG. 1 moves the base portion 81 in the moving direction, so that the support member 72 (see FIG. 2) of the advancing / retreating mechanism 71 is the most (−Y) side filter plate. It is arranged at a position where it can be engaged with the engaging portion 215 of 2. Then, the advancing / retreating mechanism 71 engages the support member 72 with the engaging portion 215, so that the filter plate 2 is held by the filter plate holding mechanism 7. After that, the moving mechanism 82 moves the base portion 81 in the (−Y) direction by a set distance L. As a result, as shown in FIG. 7, the filter plate 2 on the most (−Y) side moves to a position where it comes into contact with the moving head 41. As a result, the width in the moving direction is the set distance between the filter plate 2 and the filter plate 2 adjacent to the (+ Y) side of the filter plate 2 (hereinafter referred to as "second filter plate 2"). A space to be L (hereinafter referred to as "peeling processing space") is formed. Due to the formation of the peeling treatment space, the two filter cloths 31 (that is, the filter cloths 31 facing each other) arranged between the two filter plates 2 are separated from each other. One of the two filter plates 2 facing each other across the peeling processing space is a squeezed filter plate 2a, and the other is a normal filter plate 2b (see FIG. 5).

After that, the advancing / retreating mechanism 71 separates the support member 72 from the filter plate 2 on the most (−Y) side, and the holding of the filter plate 2 is released. The moving mechanism 82 moves the base portion 81 in the moving direction, and the advancing / retreating mechanism 71 is arranged at the position of the second filter plate 2 as shown by the alternate long and short dash line in FIG. 7. Then, the filter plate 2 is held by the filter plate holding mechanism 7.

In the state where the filter plate holding mechanism 7 holds the second filter plate 2, the cylinder mechanism 61 and the arm 63 of each filter cloth extrusion unit 60 are located in the center of the peeling processing space in the moving direction (two in FIG. 7). See cylinder mechanism 61 and arm 63 shown by dotted lines). The length of the extrusion block 633 in the moving direction is longer than the set distance L. Subsequently, as shown in FIG. 8, the cylinder mechanism 61 in the filter cloth extrusion portion 60 on the (-X) side pushes out the piston rod 611, so that the arm 63 rotates about the fulcrum by the arm support portion 64. The extrusion block 633 moves from the standby position toward the lower end of the filter cloth 31. As a result, the extrusion block 633 extrudes the rod 32 provided at the lower end of the filter cloth 31 toward the (+ X) side (that is, toward the other filter cloth extrusion portion 60), and the lower end portion of the filter cloth 31. Moves to the (+ X) side and the upper side. Actually, the lower ends of the two filter cloths 31 facing each other across the peeling processing space move in the same manner.

As described above, in the filter cloth 31 provided on the squeeze filter plate 2a (see FIG. 5), the portion other than the upper end portion is not fixed to the squeeze filter plate 2a. Further, in the filter cloth 31 provided on the ordinary filter plate 2b, the periphery of the hole corresponding to the liquid feed ring 23 and the portion other than the upper end portion are not fixed to the ordinary filter plate 2b. As described above, in each of the two filter cloths 31 facing each other with the peeling processing space interposed therebetween, the lower end portion is not constrained. Therefore, when the extrusion block 633 displaces the lower end portion of the filter cloth 31 in the width direction using the rod 32, the filter cloth 31 bends and undulates greatly from the lower end portion to the upper end portion. In other words, a large slack is formed or a large wrinkle is formed on the filter cloth 31. In reality, the filter cloth 31 provided on the squeezed filter plate 2a has undulations formed almost entirely, and the filter cloth 31 provided on the normal filter plate 2b has undulations formed almost entirely except in the vicinity of the liquid feed ring 23. To. As a result, the cake 9 (see FIG. 7) attached to the filter cloth 31 is peeled off. After that, the cylinder mechanism 61 on the (-X) side shown in FIG. 8 pulls in the piston rod 611, so that the extrusion block 633 is returned to the standby position and the rod 32 is returned to the lower side of the filter plate 2.

When the extrusion block 633 on the (-X) side returns to the standby position, the cylinder mechanism 61 in the filter cloth extrusion portion 60 on the (+ X) side pushes out the piston rod 611. As a result, the extrusion block 633 pushes out the rod 32 at the lower end of the filter cloth 31 toward the (-X) side, and the filter cloth 31 undulates greatly over almost the entire area. After that, the cylinder mechanism 61 pulls in the piston rod 611, so that the extrusion block 633 is returned to the standby position. In the cake peeling mechanism 6, the operation of repeatedly pushing out the rod 32 by the extrusion block 633 alternately by the pair of filter cloth extrusion portions 60 a predetermined number of times is performed as the cake peeling operation. By the cake peeling operation, the cake 9 adhering to the filter cloth 31 is totally peeled off. In the cake peeling operation in which the lower end portion of the filter cloth 31 whose upper end portion is fixed to the filter plate 2 is alternately displaced to both sides in the width direction, one end and the other end in the width direction at the lower end portion are moved to the upper end portion side. It can also be regarded as an individual displacement operation.

When the cake peeling operation by the cake peeling mechanism 6 is completed, the moving mechanism 82 moves the base portion 81 in the (-Y) direction by a set distance L, and the second filter plate 2 (see FIG. 7) is the most (-Y). ) Move to a position in contact with the filter plate 2 on the side. As a result, a peeling processing space is formed between the second filter plate 2 and the filter plate 2 (third filter plate 2) adjacent to the (+ Y) side of the filter plate 2. After the holding of the second filter plate 2 by the filter plate holding mechanism 7 is released, the advancing / retreating mechanism 71 is arranged at the position of the third filter plate 2, and the filter plate 2 is held by the filter plate holding mechanism 7. To. Then, the cake peeling operation by the cake peeling mechanism 6 is performed on the two filter cloths 31 facing each other across the peeling processing space in the same manner as described above.

As described above, in the filter press device 1, the filter plates 2 are sequentially moved in the (−Y) direction one by one in the plurality of filter plates 2 in close contact with each other, and a peeling processing space is formed. Further, each time the peeling treatment space is formed, the cake peeling operation is performed on the two filter cloths 31 facing each other across the peeling treatment space. When the cake peeling operation is performed on all the filter cloths 31, the processing of the slurry by the filter press device 1 is completed.

FIG. 9 is a diagram showing a part of the filter press device 90 of the comparative example. In the filter press device 90 of the comparative example, a vibration mechanism (indicated by an arrow 94 in FIG. 9) is provided in the bridge portion 812 (see FIG. 2) of the base portion 81. Further, a support member 921 is provided on the upper surface of the filter plate 92. A rod 911 is provided at the upper end of the filter cloth 91, and the rod 911 is supported by the support member 921 via the elastic member 93. The lower end of the filter cloth 91 is fixed to the lower end of the filter plate 92. In the filter press device 90 of the comparative example, the vibration mechanism 94 gives an impact to the rod 911 to vibrate the filter cloth 91 and peel off the cake adhering to the filter cloth 91. At this time, a loud noise is generated and the cake is scattered around.

On the other hand, in the filter press device 1, the cake peeling mechanism 6 displaces the lower end portion in the width direction while the upper end portion is held by one filter cloth 31 and the lower end portion is not restrained. This causes the one filter cloth 31 to undulate. As a result, the cake 9 adhering to the one filter cloth 31 can be appropriately peeled off while suppressing the generation of noise and the scattering of the cake 9.

Further, when the cake peeling mechanism 6 undulates the one filter cloth 31, the filter cloth 31 facing the one filter cloth 31 also undulates in the same manner as the one filter cloth 31. As a result, the cake 9 adhering to the two filter cloths 31 facing each other can be peeled off at the same time. Further, the cake peeling mechanism 6 moves in the moving direction with respect to the plurality of filter plates 2 by the moving mechanism 82. Thereby, the cake 9 can be peeled off in a plurality of filter cloths 31 by using one cake peeling mechanism 6.

By the way, depending on the type of slurry processed in the filter press device (for example, slurry in rare metal or non-ferrous metal smelting), corrosive gas may be generated. In this case, when the two filter plates adjacent to each other are separated from each other in the released state, the corrosive gas rises from the filtration chamber. Therefore, in the filter press device 90 of the comparative example in which the vibration mechanism 94 is provided in the bridge portion 812 of the base portion 81, the drive source in the vibration mechanism 94 is corroded and easily fails. Even when a scraper is used for peeling the cake, a mechanism for moving the scraper along the surface of the filter cloth is arranged above the filter plate, so that the drive source of the mechanism is likely to fail.

On the other hand, in the filter press device 1, the cake peeling mechanism 6 is provided at a position facing the plurality of filter plates 2 in the width direction. As a result, even when the corrosive gas rises from the filtration chamber 20 when the filtration chamber 20 is opened, it is possible to suppress the failure of the cake peeling mechanism 6 due to the corrosive gas. Further, the height of the filter press device 1 can be lowered as compared with a device in which the vibration mechanism 94 and the scraper moving mechanism are attached to the bridge portion 812 of the base portion 81. Further, the cylinder mechanism 61 and the like in the cake peeling mechanism 6 are covered with the cover portion 83, and the purge gas supply portion 84 supplies a predetermined purge gas to the inside of the cover portion 83. This makes it possible to further suppress the failure of the cake peeling mechanism 6 in a corrosive environment.

In the filter plate opening / closing mechanism 4 of the filter press device 1, the expansion / contraction member 433 and the gas filling portion 434 are added to the cylinder mechanism 43 having the piston rod 431 and the cylinder body 432. The telescopic member 433 has a cylindrical shape in which the piston rod 431 is arranged, and connects the cylinder body 432 and the moving head 41. Further, the gas filling portion 434 fills the inside of the expansion / contraction member 433 with a predetermined gas when the expansion / contraction member 433 expands with the formation of the close contact state. As a result, even when corrosive gas is generated, it is possible to suppress corrosion on the surface of the piston rod 431 and the inside of the cylinder body 432. In addition, it is possible to prevent surrounding dust and the like from adhering to the surface of the piston rod 431 and invading the inside of the cylinder body 432. As a result, the life of the cylinder mechanism 43 can be extended.

FIG. 10 is a diagram showing another example of the cake peeling mechanism. In the cake peeling mechanism 6a of FIG. 10, a pair of filter cloth elevating portions 60a are provided in place of the pair of filter cloth extrusion portions 60 in the cake peeling mechanism 6 of FIG. Other configurations are the same as those of the cake peeling mechanism 6 of FIG. 6, and the same configurations are designated by the same reference numerals.

The pair of filter cloth elevating portions 60a are attached to the two leg portions 811 of the base portion 81, respectively. Each filter cloth elevating portion 60a includes a cylinder mechanism 61 and an elevating block 634. The elevating block 634 is attached to the tip of the piston rod 611 in the cylinder mechanism 61. The elevating block 634 includes an upper stage portion 635 and a lower stage portion 636. The upper portion 635 and the lower portion 636 project inward in the width direction and are arranged with a gap in the vertical direction. The width of the gap between the upper portion 635 and the lower portion 636 is larger than the diameter of the rod 32 provided at the lower end portion of the filter cloth 31. When the cylinder mechanism 61 pushes out the piston rod 611, the elevating block 634 is arranged at the standby position shown in FIG. In the elevating block 634 arranged in the standby position, the upper step portion 635 is located above the rod 32 of the filter cloth 31, and the lower step portion 636 is located below the rod 32.

When the cake peeling mechanism 6a is moved in the moving direction together with the base portion 81, the elevating block 634 is arranged at the standby position. As a result, when the cake peeling mechanism 6a is moved, each rod 32 passes through the gap between the upper portion 635 and the lower stage portion 636, and the elevating block 634 is prevented from coming into contact with the rod 32. The lengths of the upper portion 635 and the lower portion 636 in the moving direction are substantially the same as those of the extrusion block 633 in FIG. 7, and are larger than the width of the peeling processing space in the moving direction.

When the cake peeling mechanism 6a peels the cake adhering to the filter cloth 31, the cylinder mechanism 61 of each filter cloth elevating part 60a is arranged in the center of the peeling processing space in the moving direction as in the cake peeling mechanism 6. To. Then, as shown in FIG. 11, the cylinder mechanism 61 in the filter cloth elevating portion 60a on the (+ X) side pulls in the piston rod 611, so that the elevating block 634 rises from the standby position. As a result, the (+ X) side end of the rod 32 provided at the lower end of the filter cloth 31 is pulled upward by the elevating block 634. That is, the portion on the (+ X) side at the lower end of the filter cloth 31 moves upward. Actually, in the two filter cloths 31 facing each other across the peeling processing space, the portion on the (+ X) side of the lower end portion rises. In the example of FIG. 11, in order to prevent the rod 32 from coming into contact with the sidebar 11, the elevating block 634 rises only to the vicinity of the center of the filter plate 2 (ordinary filter plate 2b) in the vertical direction, but the filter press. Depending on the design of the device 1, the elevating block 634 may rise to the vicinity of the upper end of the filter plate 2.

In each of the two filter cloths 31 facing each other across the peeling processing space, the upper end portion is held and the lower end portion is not restrained. Therefore, the elevating block 634 moves one end of the rod 32 upward and displaces one end in the width direction at the lower end portion of the filter cloth 31 toward the upper end portion side, so that most of the filter cloth 31 undulates greatly. As a result, the cake attached to the filter cloth 31 is peeled off. After that, the cylinder mechanism 61 on the (+ X) side pushes out the piston rod 611, so that the elevating block 634 is returned to the standby position, and the end portion of the rod 32 on the (+ X) side is returned to the lower side of the filter plate 2. Is done.

When the elevating block 634 on the (+ X) side returns to the standby position, the cylinder mechanism 61 in the filter cloth elevating portion 60a on the (−X) side pulls in the piston rod 611. As a result, the elevating block 634 on the (-X) side pulls up the end on the (-X) side of the rod 32, and most of the filter cloth 31 undulates greatly. After that, the cylinder mechanism 61 pushes out the piston rod 611, so that the elevating block 634 is returned to the standby position. In the cake peeling mechanism 6a, an operation of repeatedly pulling up the end portion of the rod 32 by the elevating block 634 alternately by a pair of filter cloth elevating portions 60a a predetermined number of times is performed as a cake peeling operation. By the cake peeling operation, the cake attached to the filter cloth 31 is totally peeled off. Also in the filter press device 1 having the cake peeling mechanism 6a, the cake peeling operation is performed on the two filter cloths 31 facing each other across the peeling treatment space each time the peeling treatment space is formed.

As described above, in the filter press device 1, the cake peeling mechanism 6a individually displaces one end and the other end in the width direction of the lower end portion toward the upper end portion while the upper end portion is held by one filter cloth 31. By causing the filter cloth 31, the one filter cloth 31 is undulated. As a result, the cake adhering to the one filter cloth 31 can be appropriately peeled off while suppressing the generation of noise and the scattering of the cake.

Further, when the cake peeling mechanism 6a undulates the one filter cloth 31, the filter cloth 31 facing the one filter cloth 31 also undulates in the same manner as the one filter cloth 31. As a result, the cakes adhering to the two filter cloths 31 facing each other can be peeled off at the same time. Further, the cake peeling mechanism 6a moves in the moving direction with respect to the plurality of filter plates 2 by the moving mechanism 82. Thereby, the cake can be peeled off in the plurality of filter cloths 31 by using one cake peeling mechanism 6a. As will be described later, the cake peeling mechanism 6a may move relative to a plurality of filter plates 2, the position of the cake peeling mechanism 6a is fixed, and a moving mechanism for moving only the plurality of filter plates 2 is provided. You may.

In the cake peeling mechanism 6a, the lowering of the elevating block 634 in one of the filter cloth elevating portions 60a and the ascending of the elevating block 634 in the other filter cloth elevating portion 60a may be performed in parallel (simultaneously). In this case as well, it can be considered that one end and the other end in the width direction at the lower end portion of the filter cloth 31 are individually displaced toward the upper end portion side.

Further, in the cake peeling mechanism 6a, the elevating block 634 in the pair of filter cloth elevating portions 60a can be simultaneously moved in the same direction by the same distance (the elevating block 634 and the rod shown by the alternate long and short dash line in FIG. 11). See 32). In this case, the cake peeling mechanism 6a displaces the lower end portion toward the upper end portion while the upper end portion is held by the one filter cloth 31, and causes the one filter cloth 31 to undulate. As a result, the cake adhering to the one filter cloth 31 can be appropriately peeled off. Further, unlike the filter press device 90 of the comparative example of FIG. 9, it is possible to suppress the generation of noise and the scattering of cake.

Depending on the design of the filter press device 1, in the cake peeling operation, the cake peeling mechanisms 6 and 6a can simultaneously undulate a plurality of filter cloths 31 in a plurality of filtration chambers 20 (preferably all the filtration chambers 20). Is. For example, as shown in FIG. 12, when the moving head 41 and the plurality of filter plates 2 are connected to each other by the connecting portion, the moving head 41 moves in the (−Y) direction to form a released state. In addition, a peeling treatment space is formed in all the filtration chambers 20. Further, each filter cloth extrusion unit 60 of the cake peeling mechanism 6 is provided with an extrusion block 633a extending over a plurality of peeling processing spaces (plural filtration chambers 20) in the moving direction. In FIG. 12, the extrusion block 633a is shown by a chain double-dashed line. The extrusion block 633a may be supported by a plurality of arms 63 arranged apart from each other in the moving direction.

In the cake peeling operation, the extrusion block 633a of one filter cloth extrusion section 60 pushes the lower end portions (rods 32) of the plurality of filter cloths 31 in the plurality of filtration chambers 20 toward the other filter cloth extrusion section 60. , It is possible to undulate a plurality of filter cloths 31 in a plurality of filtration chambers 20 at the same time. As a result, the cake 9 can be peeled off from the plurality of filter cloths 31 in a short time. The same applies when the cake peeling mechanism 6a of FIG. 10 is used.

The filter press device 1 can be deformed in various ways.

In the filter press device 1, filter plates 2 having various shapes may be used. For example, in the ordinary filter plate 2b shown in FIG. 13, two slurry supply holes 219 are provided at the upper part. In the filter cloth 31 provided on the ordinary filter plate 2b, a hole portion is provided at a position facing each slurry supply hole 219, and the periphery of the hole portion and the upper end portion are fixed to the ordinary filter plate 2b. .. Also in the filter press device 1 shown in FIG. 13, the cake peeling mechanism 6 displaces the lower end portion of the filter cloth 31 in the width direction, so that the cake can be appropriately peeled while suppressing the generation of noise and the like. Of course, the cake peeling mechanism 6a may be used.

Further, in the filter press device 1, a filter plate 2 in which the diaphragm 22 is provided only on one main surface facing the moving direction may be used. In the filter plate 2, the other main surface is the facing surface 25 which is the main surface of the filter plate main body 21. In such a filter press device 1, a plurality of filter plates 2 of the same type are arranged in the moving direction.

The cake peeling mechanisms 6 and 6a may be used in the filter press device 1 in which the lower end portion of the filter cloth 31 is fixed to the filter plate 2. In the example of FIG. 14, the support member 241 is provided on the upper surface of the filter plate 2. A rod 32 is provided at the upper end of the filter cloth 31, and the rod 32 is supported by the support member 241 via the elastic member 242. The lower end of the filter cloth 31 is fixed to the lower surface of the filter plate 2. In the filter press device 1 of FIG. 14, the cake peeling mechanism 6, 6a displaces the upper end portion of the filter cloth 31 in the width direction by using the rod 32, or one end in the width direction and the like at the upper end portion of the filter cloth 31. Displace the ends individually toward the lower end. As a result, the cake can be appropriately peeled off while suppressing the generation of noise and the like. Since the upper end portion of the filter cloth 31 connected to the elastic member 242 can move in all directions, it can be considered that the filter cloth 31 is not substantially restrained.

Further, in the filter press device (filter cloth hanging type filter press device) in which the upper ends of the two filter cloths are held by the support bar between the two filter plates adjacent to each other, the cake peeling mechanisms 6 and 6a are adopted. You may. In this case, for example, when the two filter plates are separated from each other, the cake peeling mechanisms 6 and 6a displace the rod provided at the lower end of each filter cloth to cause the filter cloth to undulate and the cake to be peeled off. Will be done. After that, the support bar is lowered from a position above the filter plate, and the rod is pulled upward. At this time, the filter cloth is inverted at the inversion bar provided below the two filter plates, and the cake remaining on the filter cloth is peeled off.

As described above, in the cake peeling mechanism 6, after the one filter cloth 31 and the filter cloth 31 facing the one filter cloth 31 are separated from each other in the released state, one end of the one filter cloth 31 in the vertical direction is used. It is important to displace the other end in the width direction while the portion is held and the other end is not constrained. Further, in the cake peeling mechanism 6a, after the one filter cloth 31 and the filter cloth 31 facing the one filter cloth 31 are separated from each other in the released state, one end of the one filter cloth 31 in the vertical direction is held. In this state, one end and the other end in the width direction at the other end are individually displaced toward the one end side, or the other end is held by the one filter cloth 31. It is important to displace the lower end, which is the end of the cloth, upward.

In the cake peeling mechanisms 6 and 6a, the rod 32 extending in the width direction is attached to the upper end or the lower end of the filter cloth 31 which is not fixed to the filter plate 2, so that the filter cloth 31 can be easily undulated by using the rod 32. However, depending on the design of the cake peeling mechanisms 6 and 6a, the filter cloth 31 may be undulated without using the rod 32. For example, it is possible to adopt a mechanism that grips the lower end of the filter cloth 31 and displaces it in the width direction or the vertical direction, a mechanism that pulls the wire connected to the lower end of the filter cloth 31 in the width direction or the vertical direction, and the like. .. Further, the drive source in the cake peeling mechanisms 6 and 6a may be an actuator other than the cylinder mechanism 61 such as a motor. From the viewpoint of suppressing the failure of the cake peeling mechanism 6, 6a due to the corrosive gas, it is preferable that the cover portion 83 covers at least the drive source of the cake peeling mechanism 6, 6a.

The movement of the cake peeling mechanism 6, 6a in the moving direction with respect to the plurality of filter plates 2 may be relative, for example, the positions of the cake peeling mechanisms 6, 6a are fixed, and only the plurality of filter plates 2 are moved. A moving mechanism for moving may be provided.

The supply of the slurry between the two filter cloths 31 facing each other may be realized by a configuration that does not use the liquid feed ring 23. For example, the slurry may be supplied between the two filter cloths 31 by using a liquid feeder sandwiched between the side portions of the two filter plates 2 in a close contact state.

When the corrosive gas is not generated in the processing of the slurry, the cover portion 83 and the purge gas supply portion 84, and the expansion / contraction member 433 and the gas filling portion 434 of the cylinder mechanism 43 may be omitted.

In the cylinder mechanism 43, a plurality of holes in the telescopic member 433 may be omitted, and the inside of the telescopic member 433 may be sealed except for the connecting pipe 435. In this case, for example, as shown in FIG. 15, the intake / exhaust port 436 is provided at the end of the connecting pipe 435 on the opposite side of the telescopic member 433. The intake / exhaust port 436 is arranged at a position away from the plurality of filter plates 2. This makes it possible to supply the air in the vicinity of the intake / exhaust port 436, that is, the air containing no corrosive gas, to the inside of the expansion / contraction member 433 when the expansion / contraction member 433 expands with the formation of the close contact state. .. In the example of FIG. 15, it can be said that the intake / exhaust port 436 is a gas filling portion that fills the inside of the expansion / contraction member 433 with gas when the expansion / contraction member 433 is extended.

Further, instead of the connection pipe 435 and the intake / exhaust port 436 of FIG. 15, the bag-shaped member 437 shown in FIG. 16 may be provided. In the cylinder mechanism 43 of FIG. 16, when the expansion / contraction member 433 is expanded due to the formation of the close contact state, the gas in the bag-shaped member 437 is supplied to the inside of the expansion / contraction member 433, and the bag-shaped member 437 is deflated (FIG. 16). (See the telescopic member 433 and the bag-shaped member 437 shown by the two-dot chain line inside). Further, when the expansion / contraction member 433 contracts with the formation of the released state, the gas in the expansion / contraction member 433 is supplied to the inside of the bag-shaped member 437, and the bag-shaped member 437 expands (shown by a solid line in FIG. 16). See telescopic member 433 and bag-shaped member 437). The bag-shaped member 437 can be regarded as a gas filling portion. In the cylinder mechanism 43 of FIGS. 15 and 16, even when corrosive gas is generated from the filtration chamber 20, corrosion of the surface of the piston rod 431 and the inside of the cylinder body 432 can be suppressed.

The elastic member 433 does not necessarily have to be a bellows-shaped member, and the elastic member 433 may be formed of an elastic member such as rubber as long as it is possible to prevent corrosive gas from entering the inside.

The above-described embodiments and configurations in the respective modifications may be appropriately combined as long as they do not conflict with each other.

1 Filter press device 2,2a, 2b Filter plate 4 Filter plate opening / closing mechanism 6,6a Cake peeling mechanism 20 Filter chamber 22 Diaphragm 25 Facing surface 31 Filter cloth 32 Rod 41 Moving head 42 Fixed head 43 (of filter plate opening / closing mechanism) Cylinder Mechanism 51 Slurry supply part 61 Cylinder mechanism (of cake peeling mechanism) 82 Movement mechanism 83 Cover part 84 Purge gas supply part 431 Piston rod 432 Cylinder body 433 Telescopic member 434 Gas filling part 436 Intake / exhaust port 437 Bag-shaped member

Claims (10)

It ’s a filter press device.
A plurality of filter plates arranged in a predetermined moving direction and supported so as to be movable in the moving direction,
A plurality of filter cloths covering each of the plurality of filtration surfaces in the plurality of filter plates, with the surfaces facing each other in the two adjacent filter plates as the filtration surfaces,
It has a moving head and a fixed head arranged so as to sandwich the plurality of filter plates in the moving direction, and the movement of the moving head in the moving direction causes the moving head and the plurality of filter plates to move in the moving direction. A filter plate opening / closing mechanism that selectively forms a close contact state in which they are in close contact with each other and a release state in which the close contact state is released.
In the close contact state, the slurry supply unit that supplies the slurry between the two filter cloths facing each other and the slurry supply unit.
Each filtration surface extends in the vertical direction and the width direction perpendicular to the vertical direction, and after the separation between the one filter cloth and the filter cloth facing the one filter cloth in the released state, in the one filter cloth. A cake that undulates the one filter cloth by shifting the other end in the width direction while one end in the vertical direction is held and the other end is not restrained. With the peeling mechanism,
A filter press device characterized by comprising. It ’s a filter press device.
A plurality of filter plates arranged in a predetermined moving direction and supported so as to be movable in the moving direction,
A plurality of filter cloths covering each of the plurality of filtration surfaces in the plurality of filter plates, with the surfaces facing each other in the two adjacent filter plates as the filtration surfaces,
It has a moving head and a fixed head arranged so as to sandwich the plurality of filter plates in the moving direction, and the movement of the moving head in the moving direction causes the moving head and the plurality of filter plates to move in the moving direction. A filter plate opening / closing mechanism that selectively forms a close contact state in which they are in close contact with each other and a release state in which the close contact state is released.
In the close contact state, the slurry supply unit that supplies the slurry between the two filter cloths facing each other and the slurry supply unit.
Each filtration surface extends in the vertical direction and the width direction perpendicular to the vertical direction, and after the separation between the one filter cloth and the filter cloth facing the one filter cloth in the released state, the one filter cloth is used. While the one end in the vertical direction is held, the one end and the other end in the width direction at the other end are individually displaced toward the one end side to obtain the one filter cloth. The undulating cake peeling mechanism and
A filter press device characterized by comprising. It ’s a filter press device.
A plurality of filter plates arranged in a predetermined moving direction and supported so as to be movable in the moving direction,
A plurality of filter cloths covering each of the plurality of filtration surfaces in the plurality of filter plates, with the surfaces facing each other in the two adjacent filter plates as the filtration surfaces,
It has a moving head and a fixed head arranged so as to sandwich the plurality of filter plates in the moving direction, and the movement of the moving head in the moving direction causes the moving head and the plurality of filter plates to move in the moving direction. A filter plate opening / closing mechanism that selectively forms a close contact state in which they are in close contact with each other and a release state in which the close contact state is released.
In the close contact state, the slurry supply unit that supplies the slurry between the two filter cloths facing each other and the slurry supply unit.
Each filtration surface extends in the vertical direction and the width direction perpendicular to the vertical direction, and after the separation between the one filter cloth and the filter cloth facing the one filter cloth in the released state, in the one filter cloth. A cake peeling mechanism that undulates the one filter cloth by moving the lower end portion, which is the other end portion, upward while the upper end portion is held.
A filter press device characterized by comprising. The filter press apparatus according to any one of claims 1 to 3.
A filter press device characterized in that when the cake peeling mechanism undulates the one filter cloth, the filter cloth facing the one filter cloth also undulates in the same manner as the one filter cloth. The filter press apparatus according to any one of claims 1 to 4.
A filter press device characterized in that a drive source of the cake peeling mechanism is provided at a position facing the plurality of filter plates in the width direction when viewed along the moving direction . The filter press apparatus according to any one of claims 1 to 5.
A cover portion that covers at least the drive source in the cake peeling mechanism, and
A purge gas supply unit that supplies a predetermined purge gas to the inside of the cover unit,
A filter press device characterized by comprising. The filter press apparatus according to any one of claims 1 to 6.
A rod extending in the width direction is attached to the other end of the one filter cloth.
A filter press device in which the cake peeling mechanism undulates the one filter cloth using the rod. The filter press apparatus according to any one of claims 1 to 7.
A filter press device further comprising a moving mechanism for moving the cake peeling mechanism relative to the plurality of filter plates in the moving direction. The filter press apparatus according to any one of claims 1 to 8.
A filter press device characterized in that the cake peeling mechanism undulates the filter cloths in a plurality of filtration chambers at the same time, with the space between the two filtration surfaces facing each other as a filtration chamber. The filter press apparatus according to any one of claims 1 to 9.
The filter plate opening / closing mechanism further includes a cylinder mechanism for moving the moving head.
The cylinder mechanism
The piston rod fixed to the moving head and
A cylinder body that reciprocates the piston rod in the moving direction, and
A cylindrical member having the piston rod arranged inside and being expandable and contractible in the moving direction, and an elastic member connecting the cylinder body and the moving head.
When the telescopic member expands with the formation of the close contact state, a gas filling portion that fills the inside of the telescopic member with a predetermined gas, and a gas filling portion.
A filter press device characterized by having.

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