Filter cloth and filter device

Abstract

Provided is a filter cloth and a filter device that can prevent the filtered material from staying at a lower opening and causing discharge problems when the filtered material is discharged. [Solution] The filter cloth 1 of the filtration device 100 extends in the vertical direction and has a front portion 21 and a back portion 22 opposite the front portion 21, with the front portion 21 and back portion 22 continuing at both side edges 11a, 11b, respectively, and has a peripheral portion 11 through which filtrate passes, a lower opening 14 defined by the lower end of the peripheral portion 11 and for discharging filtered material A, and a pair of cut portions 15a, 15b extending upward from the lower ends of both side edges 11a, 11b of the peripheral portion 11, respectively.

Description

[Technical Field]

[0001] The present invention relates to a filter fabric and a filter device. [Background technology]

[0002] A known example of a movable filtering device equipped with a filter cloth is the filtering device described in Patent Document 1. The filter cloth of this filtering device has an opening at the bottom. After the dehydration filtering process is completed, the residue inside the filter cloth is removed from the opening at the bottom. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-158162 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the filter cloth described in Patent Document 1 has a problem in that the residue may clog the openings when the residue is removed. [Means for solving the problem]

[0005] In order to solve the above problems, a filter cloth according to one embodiment of the present invention is a filter cloth for a filtration device, which extends in the vertical direction and has a front portion and a back portion opposite the front portion, with the front portion and the back portion continuing at both side edges, a peripheral portion through which filtrate passes, a lower opening defined by the lower end of the peripheral portion and for discharging filtered material, and a pair of cut portions extending upward from the lower ends of both side edges of the peripheral portion.

[0006] According to this configuration, when the filtered material is discharged, it is possible to prevent the filtered material from accumulating at the lower opening and causing discharge problems. [Effects of the Invention]

[0007] The present invention has an effect of preventing the filtered material from accumulating at the lower opening when the filtered material is being discharged, thereby preventing poor discharge. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view schematically illustrating a configuration example of a filtering device according to an embodiment. [Figure 2] 2 is a front view showing an example of the configuration of a filter cloth of the filtering device of FIG. 1. FIG. [Figure 3] FIG. 2 is a rear view of the filtration device of FIG. 1. [Figure 4] 2 is a side view showing an example of operation of the filtering device of FIG. 1. FIG. [Figure 5] 2 is a side view showing the movement of the lower end of the filter cloth when the filtered material is discharged from the filtering device of FIG. 1. FIG. [Figure 6] FIG. 10 shows another embodiment of the filter cloth. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. Note that the present invention is not limited to the following embodiments. In addition, the same or corresponding elements will be denoted by the same reference numerals throughout the drawings, and redundant description will be omitted.

[0010] FIG. 1 is a side view schematically illustrating an example of the configuration of a filtration device 100 according to an embodiment. The filtration device 100 is a device that sandwiches a filter cloth 1 containing a raw liquid (slurry) between a pair of filter plates, squeezes and filters the liquid, and extracts the filtered material (dehydrated cake) remaining inside the filter cloth 1; it is also called a filter press device. For example, the raw liquid is a mixture of azuki beans and broth obtained by boiling azuki beans. The filtered material, obtained by separating the filtrate from the raw liquid, is azuki bean paste. As shown in FIG. 1, the filtration device 100 includes a filter cloth 1 and a device main body 3. First, an example of the configuration of the filter cloth 1 will be described, followed by an example of the configuration of the device main body 3.

[0011] [Example of filter fabric configuration] FIG. 2 is a front view showing an example of the configuration of the filter cloth 1. For ease of explanation, hereinafter, the left side as viewed from the front will be simply referred to as the left, and the right side as viewed from the front will be simply referred to as the right. The filter cloth 1 is a tubular cloth. As shown in FIG. 2, the filter cloth 1 includes a peripheral surface portion 11, an insertion hole 12, an upper opening 13, a lower opening 14, left and right cutout portions 15a, 15b, a plurality of loops 16a, 16b, 16c, 16d, a plurality of notches 17, and a string 18.

[0012] The peripheral portion 11 is made of a material that allows filtrate to pass through, such as a nylon fabric. The peripheral portion 11 is a cylindrical body that extends in the vertical direction. More specifically, the peripheral portion 11 is formed into a cylindrical shape by folding the left and right ends of a rectangular piece of fabric back and overlapping them, and then gluing the overlapping portions together.

[0013] The peripheral surface portion 11 includes a front surface portion 21 and a back surface portion 22. The front surface portion 21 and the back surface portion 22 are continuous with each other at the left edge 11a and the right edge 11b of the peripheral surface portion 11, respectively. The front surface portion 21 is formed in a vertically long rectangle when viewed from the front, with its longitudinal direction extending in the up-down direction and its lateral direction extending in the left-right direction. The back surface portion 22 has the same contour as the front surface portion 21 when viewed from the front. The back surface portion 22 faces the front surface portion 21, with its longitudinal direction extending in the up-down direction and its lateral direction extending in the left-right direction.

[0014] An insertion hole 12 is formed in the front portion 21 of the peripheral surface portion 11, through which a nozzle 44 (described later) for injecting the concentrate is inserted. The insertion hole 12 is formed in a shape that allows the nozzle 44 to fit, and is, for example, a circular hole. A ring-shaped reinforcing cloth 12a is fixed around the insertion hole 12 in the front portion 21 to prevent the front portion 21 from tearing.

[0015] The area defined by the upper end of the peripheral portion 11 is the upper opening 13. The area defined by the lower end of the peripheral portion 11 is the lower opening 14. The peripheral portion 11 has an upper folded portion 19 and a lower folded portion 20 at its upper and lower ends, respectively. The upper folded portion 19 is formed by folding the lower end of the fabric constituting the peripheral portion 11 outward and downward, overlapping it two or three or more times, and sewing the overlapped fabric. The lower folded portion 20 is formed by folding the lower end of the fabric constituting the peripheral portion 11 outward and upward, overlapping it two or three or more times, and sewing the overlapped fabric. This reinforces the upper and lower ends of the peripheral portion 11. Furthermore, because the upper folded portion 19 and the lower folded portion 20 are folded outward, the inner surfaces of the upper folded portion 19 and the lower folded portion 20 are smooth and step-free. In addition, the upper and lower ends of the peripheral portion 11 are sewn together and shrink due to the tension of the sewing thread in the upper folded portion 19 and the lower folded portion 20, and the internal space surrounded by the peripheral portion 11 becomes narrower at the upper and lower ends of the peripheral portion 11.

[0016] A pair of left and right cutouts 15a, 15b are formed extending upward from the lower end of the left edge 11a and the lower end of the right edge 11b of the peripheral surface portion 11, respectively. The cutouts 15a, 15b are formed, for example, by cutting out a U-shape in the lower end of the peripheral surface portion 11 by thermal fusion. The cutouts 15a, 15b penetrate the lower folded portion 20 in the vertical direction, and their upper ends are located above the lower folded portion 20. By forming the cutouts 15a, 15b, the internal space surrounded by the peripheral surface portion 11 is opened at the upper and lower ends of the peripheral surface portion 11, and the narrowing of the upper and lower ends of the peripheral surface portion 11 is eliminated.

[0017] Furthermore, loops 16a, 16b, 16c, and 16d are formed at the four corners of the filter cloth 1. The loops 16a, 16b, 16c, and 16d are loops for attaching the filter cloth 1 to the filtration device 100, and are formed by fixing both ends of a belt-shaped body to the peripheral surface portion 11.

[0018] More specifically, one end of the lower-left loop 16a is fixed to a portion of the lower end of the front portion 21, on the left edge 11a side. The portion of the lower-left loop 16a extending from one end to the other passes outside the left cutout 15a. The other end of the lower-left loop 16a is fixed to a portion of the lower end of the back portion 22, on the left edge 11a side. The lower-right loop 16b has one end fixed to a portion of the lower end of the front portion 21, on the right edge 11b side. The portion of the lower-right loop 16b extending from one end to the other passes outside the right cutout 15b. The other end of the lower-right loop 16b is fixed to a portion of the lower end of the back portion 22, on the right edge 11b side. The upper-left loop 16c has one end fixed to a portion of the upper end of the front portion 21, on the left edge 11a side. The other end of the upper left loop 16c is fixed to a portion of the upper end of the back portion 22, on the left edge 11a side. The upper right loop 16d has one end fixed to a portion of the upper end of the front portion 21, on the right edge 11b side. The other end of the upper right loop 16d is fixed to a portion of the upper end of the back portion 22, on the right edge 11b side.

[0019] A plurality of notches 17 are formed at the upper end of the peripheral portion 11. The notches 17 are formed by cutting out a U-shape at the upper end of the peripheral portion 11 by thermal cutting. The notches 17 are formed, for example, at the upper ends of the left edge 11a and right edge 11b of the peripheral portion 11, at the center of the upper end of the front portion 21, and at the center of the upper end of the back portion 22, for a total of four notches 17. The upper end of the peripheral portion 11 is folded back to form a string-threading portion 11c, which is a cylindrical space extending in the circumferential direction of the peripheral portion 11. The string-threading portion 11c opens at the portion where the notches 17 are formed. A string 18 is inserted into the string-threading portion 11c using one of the notches 17 as a string-threading opening. The string 18 is inserted into the string-threading portion 11c so as to go around the upper end of the peripheral portion 11, and both ends are tied. As a result, the string 18 is exposed from the plurality of cutouts 17.

[0020] [Device configuration example] 1, the device body 3 includes a first filter plate 31, a second filter plate 32, a fixed plate 33, a movable plate 34, an upper closing portion 36, a lower closing portion 38, a plurality of hanging portions 40, a plurality of pulling portions 42, and a housing 30. The device body 3 further includes a filter plate drive portion 35, an upper closing portion drive portion 37, a lower closing portion drive portion 39, and a stock solution injection portion 43, which are arranged inside the housing 30.

[0021] The first filter plate 31 and the second filter plate 32 are flat plates extending in the vertical direction and are made of, for example, resin. The second filter plate 32 is positioned opposite the first filter plate 31. Hereinafter, the direction from the second filter plate 32 toward the first filter plate 31 will be simply referred to as the "front," and the opposite direction will be simply referred to as the "rear." The filter cloth 1 is disposed in the space between the surface of the first filter plate 31 and the surface of the second filter plate 32.

[0022] The fixed plate 33 extends vertically parallel to the first filter plate 31 and is positioned so that its surface abuts against the entire back surface of the first filter plate 31. The fixed plate 33 has enough rigidity to withstand the reaction force generated during compression, and keeps the first filter plate 31 flat during compression. The movable plate 34 extends vertically parallel to the second filter plate 32 and is positioned so that its surface abuts against the entire back surface of the second filter plate 32. The movable plate 34 has enough rigidity to withstand the reaction force generated during compression, and keeps the second filter plate 32 flat during compression. In this way, the fixed plate 33 and the movable plate 34 are positioned so that the first filter plate 31 and the second filter plate 32 are sandwiched between them. The first filter plate 31 is attached to and supported by the fixed plate 33. The second filter plate 32 is attached to and supported by the movable plate 34. However, the first filter plate 31 and the second filter plate 32 may be supported by separate members.

[0023] The filter plate drive unit 35 is a mechanism that moves the movable plate 34 in the front-to-rear direction, thereby moving the second filter plate 32 in a direction toward and away from the first filter plate 31. The filter plate drive unit 35 includes an arm 35a and an actuator 35b. The arm 35a has a base end connected to the actuator 35b and a tip end connected to the movable plate 34. The actuator 35b is, for example, a hydraulic cylinder, and linearly drives the arm 35a in the front-to-rear direction. In this embodiment, the device main body 3 has two filter plate drive units 35 arranged vertically. The tip end of the arm 35a of the upper filter plate drive unit 35 is connected to the upper side of the movable plate 34. The tip end of the arm 35a of the lower filter plate drive unit 35 is connected to the lower side of the movable plate 34.

[0024] FIG. 3 is a rear view of the filtration device 100. The movable plate 34 and the drive unit are not shown in FIG. 3. The upper closing portion 36 and the lower closing portion 38 are used to press and close the upper opening 13 and the lower opening 14 of the filter cloth 1, respectively. As shown in FIGS. 1 and 3, the upper closing portion 36 is located above the second filter plate 32 and is a rigid rod-shaped body that extends behind the filter cloth 1, across a portion below the upper folded portion 19 at the upper end of the filter cloth 1. The lower closing portion 38 is located below the second filter plate 32 and is a rigid rod-shaped body that extends behind the filter cloth 1, across a portion above the left notch 15a and the right notch 15b at the lower end of the filter cloth 1.

[0025] As shown in FIG. 1, the upper closing section drive unit 37 is a mechanism that moves the upper closing section 36 in the front-to-rear direction, i.e., in the direction of moving it toward and away from the first filter plate 31. The upper closing section drive unit 37 includes an arm 37a and an actuator 37b. The upper closing section drive unit 37 has a base end connected to the actuator 37b and a tip end connected to the upper closing section 36. The actuator 37b is, for example, a hydraulic cylinder, and linearly drives the arm 37a in the front-to-rear direction.

[0026] The lower closing part drive unit 39 is a mechanism that moves the lower closing part 38 in the front-to-rear direction, i.e., in the direction of moving it toward and away from the first filter plate 31. The lower closing part drive unit 39 includes an arm 39a and an actuator 39b. The arm 39a and the actuator 39b have the same configuration as the arm 37a and the actuator 37b, respectively.

[0027] As shown in FIGS. 1 and 3 , the hanging parts 40 suspend and hold the filter cloth 1 so that the filter cloth 1 is positioned at a predetermined position between the first filter plate 31 and the second filter plate 32. A plurality of hanging parts 40 are provided so that they are positioned outside the plurality of cutouts 17 of the filter cloth 1 when the filter cloth 1 is positioned at a predetermined position between the first filter plate 31 and the second filter plate 32. Each hanging part 40 includes a hook and a support frame that supports the hook. The filter cloth 1 is held suspended from the hanging parts 40 by hanging the hook of the hanging part 40 on the string 18 exposed from the cutout 17.

[0028] 3, four pulling portions 42 are provided corresponding to the lower left loop 16a, lower right loop 16b, upper left loop 16c, and upper right loop 16d of the filter cloth 1. The four pulling portions 42 are located to the lower left of the lower left loop 16a, the lower right of the lower right loop 16b, the upper left of the upper left loop 16c, and the upper right of the upper right loop 16d of the filter cloth 1 suspended from the hanging portion 40. Each pulling portion 42 includes, for example, a coil spring having a hook at its tip, and a support frame connected to the base end of the coil spring and supporting the coil spring.

[0029] 1, the stock solution injecting section 43 is a mechanism that injects stock solution into the inside of the filter cloth 1. The stock solution injecting section 43 includes a nozzle 44 that extends through the fixed plate 33 and the first filter plate 31 in the front-rear direction. The tip of the nozzle 44 is inserted into the insertion hole 12.

[0030] [Filtration procedure] Next, a description will be given of a filtering procedure using the filtering device 100. Fig. 4 is a side view showing an example of the operation of the filtering device 100. Fig. 5 is a side view showing the movement of the lower end of the filter cloth 1 when filtering material A is discharged.

[0031] In the initial state, the upper closing portion 36, the lower closing portion 38 and the second filter plate 32 are located at initial positions spaced apart from the first filter plate 31. Note that Fig. 1 shows this initial state.

[0032] First, the worker hangs the strings 18 exposed from the notches 17 of the filter cloth 1 by hanging them from the hanging parts 40 of the device main body 3. As a result, the filter cloth 1 is hung from the hanging parts 40 so as to be positioned at a predetermined position between the first filter plate 31 and the second filter plate 32.

[0033] Next, the worker hooks the lower-left loop 16a, the lower-right loop 16b, the upper-left loop 16c, and the upper-right loop 16d onto the corresponding coil spring hooks of the traction units 42. As a result, as shown in FIG. 3 , the four corners of the filter cloth 1 are pulled outward, placing the filter cloth 1 in a taut state. The two lower traction units 42 also pull the lower-left loop 16a and the lower-right loop 16b in directions that separate them from each other, i.e., in the left-right direction. This pulls the lower end of the peripheral portion 11 in the left-right direction. When the lower end of the peripheral portion 11 is pulled in the left-right direction, the front portion 21 and the back portion 22 move closer together, narrowing the lower opening 14 in the front-to-rear direction. The worker then inserts a nozzle 44 into the insertion hole 12 of the filter cloth 1.

[0034] Next, as shown in Figure 4, the upper closing section drive unit 37 moves the upper closing section 36 forward, pressing the upper end of the filter cloth 1 toward the first filter plate 31. The lower closing section drive unit 39 moves the lower closing section 38 forward, pressing the lower end of the filter cloth 1 toward the first filter plate 31. This closes the upper and lower ends of the filter cloth 1, forming a closed space for storing the stock solution inside. Then, the stock solution injector 43 pours a predetermined amount of stock solution into the filter cloth 1 via the nozzle 44.

[0035] Next, the filter plate drive unit 35 moves the second filter plate 32 toward the first filter plate 31, sandwiching the filter cloth 1. Furthermore, the filter plate drive unit 35 gradually moves the second filter plate 32 toward the first filter plate 31. As a result, the filter cloth 1 is sandwiched between the first filter plate 31 and the second filter plate 32, and the stock solution is squeezed. The filtrate separated from the stock solution permeates the peripheral surface portion 11 and flows from the inside to the outside of the filter cloth 1. Because the filter cloth 1 is in a taut state by the pulling unit 42, it is possible to prevent the filter cloth 1 from twisting during squeezing.

[0036] Then, when the second filter plate 32 advances to a predetermined position and squeezing is complete, the filter plate drive unit 35 retracts the second filter plate 32 to its initial position. Furthermore, the upper closure drive unit 37 and the lower closure drive unit 39 retract the upper closure unit 36 ​​and the lower closure unit 38, respectively, to their initial positions. This opens the lower opening 14, and the filtered material A remaining inside the filter cloth 1 descends toward the lower opening 14 due to its own weight. When the filtered material A approaches the narrowed lower opening 14 due to being pulled laterally by the traction unit 42, it pushes the front and rear portions 21 and 22 outward, i.e., in the front-to-rear direction. This opens the left and right cutouts 15a and 15b, widening the gap between the lower ends of the front and rear portions 21 and 22 and widening the lower opening 14. This allows the filtered material A to be smoothly discharged from the lower opening 14.

[0037] As described above, the filter cloth 1 has the left cutout 15a and the right cutout 15b extending upward from the lower ends of the left edge 11a and the right edge 11b of the peripheral surface portion 11, respectively, so that after filtration, when the filtered material A is discharged from the lower opening 14, the lower opening 14 can be widened. This allows the filtered material A to be discharged smoothly from the lower opening 14.

[0038] (Other embodiments) 6 shows another embodiment of the filter cloth, where (a) is a front view, (b) is a back view, (c) is a plan view, (d) is a bottom view, (e) is a left side view, (f) is a right side view, and (g) is an enlarged view of the AA portion. In each figure, the part indicated by the solid line is the part for which the design registration is sought.

[0039] From the above description, many modifications and other embodiments of the present invention will be apparent to those skilled in the art. Therefore, the above description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode for carrying out the present invention. Details of the structure and / or function thereof may be substantially changed without departing from the spirit of the present invention. [Explanation of symbols]

[0040] 1 filter cloth 11 Peripheral part 11a Left edge 11b Right edge 14 Lower opening 15a Left notch 15b Right notch 16a Lower Left Loop 16b Lower Right Loop 21 Front 22 Back section 31 1st filter plate 32 Second filter plate 35 Filter plate drive unit 38 Lower closure 39 Lower closure drive unit 42 Traction section 44 nozzles 100 Filtration equipment

Claims

1. A filter cloth for a filtration device, comprising: a peripheral portion that is a cylindrical body extending in the vertical direction, the peripheral portion having a front portion and a back portion facing the front portion, the front portion and the back portion being continuous at both side edges, and made of a fabric that is permeable to filtrate; A lower opening defined by the lower end of the peripheral surface portion for discharging filtered material; a pair of notches extending upward from the lower ends of both side edges of the peripheral surface portion, respectively.

2. The filter cloth according to claim 1 , wherein the peripheral portion has a folded portion formed by folding a lower end of the fabric upward, overlapping the fabric, and sewing the overlapped fabric together.

3. a pair of loops for attaching the filter cloth to the filter device; One end of one loop is fixed to one side edge portion of the lower end portion of the front portion, a portion extending from one end to the other end passes outside one of the notches, and the other end is fixed to one side edge portion of the lower end portion of the back portion, The other loop has one end fixed to the other side edge portion of the lower end of the front section, a portion extending from the one end toward the other end passing outside the other of the incisions, and the other end fixed to the other side edge portion of the lower end of the back section.

4. The filter cloth according to claim 1 , further comprising an insertion hole formed in the peripheral surface portion, through which a nozzle for injecting the stock solution is inserted.

5. The filter fabric according to claim 1 , having an upper opening defined by the upper end of the peripheral portion.

6. a first filter plate extending in the vertical direction; a second filter plate facing the first filter plate and extending in the vertical direction; a filter plate driving unit that moves the second filter plate in a direction toward and away from the first filter plate; A filter cloth sandwiched between the first filter plate and the second filter plate; a closing portion located below the second filter plate and extending across the lower end of the filter fabric; a closing portion drive portion that moves the closing portion in a direction approaching and separating from the first filter plate, The filter cloth is a cylindrical body extending in the vertical direction, the cylindrical body having a front portion and a back portion facing the front portion, the front portion and the back portion being continuous at both side edges, and a peripheral portion through which filtrate passes; A lower opening defined by the lower end of the peripheral surface portion for discharging filtered material; a pair of notches extending upward from the lower ends of both side edges of the peripheral surface portion, respectively.

7. The filter cloth has a pair of loops, one end of which is fixed to one side edge portion of the lower end portion of the front portion, a portion extending from one end toward the other end passing outside one of the notches, and the other end of which is fixed to one side edge portion of the lower end portion of the back portion; and the other end of which is fixed to the other side edge portion of the lower end portion of the front portion, a portion extending from one end toward the other end passing outside the other notch, and the other end of which is fixed to the other side edge portion of the lower end portion of the back portion, The filtering device according to claim 6 , further comprising a pulling portion that pulls the pair of loops in directions away from each other.

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