Filter cloth and filtration device

Abstract

The present invention provides a filter cloth and a filtration device that can prevent the accumulation of filtered material at the lower opening during discharge, thereby preventing poor discharge. [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 facing the front portion 21, with the front portion 21 and the back portion 22 being continuous at both side edges 11a and 11b, respectively, and has a circumferential portion 11 through which filtrate passes, a lower opening 14 partitioned by the lower end of the circumferential portion 11 for discharging the filtrate A, and a pair of notches 15a and 15b extending upward from the lower ends of both side edges 11a and 11b of the circumferential portion 11, respectively.

Description

Technical Field

[0001] The present invention relates to a filter cloth and a filtering device.

Background Art

[0002] As a movable filtering device provided with a filter cloth, for example, the filtering device of Patent Document 1 is known. The filter cloth of this filtering device has an opening at the bottom. After the dehydration filtration process is completed, the residue inside the filter cloth is extracted from the lower opening.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the filter cloth described in Patent Document 1 has a problem that the residue may be clogged at the opening when the residue is extracted.

Means for Solving the Problems

[0005] In order to solve the above problems, a filter cloth according to an aspect of the present invention is a filter cloth of a filtering device, which extends in the vertical direction, has a front portion and a back portion facing the front portion, and the front portion and the back portion are continuous at both side edges, a peripheral portion through which filtrate permeates, a lower opening portion defined by a lower end of the peripheral portion for discharging filter residue, and a pair of cut portions extending upward from lower ends of both side edges of the peripheral portion.

[0006] According to this configuration, it is possible to prevent the filter residue from staying at the lower opening portion and causing poor discharge when discharging the filter residue.

Effects of the Invention

[0007] The present invention has the effect of preventing the accumulation of filtered material at the lower opening during discharge, which can lead to poor discharge. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic side view showing an example of the configuration of a filtration device according to an embodiment. [Figure 2] Figure 1 is a front view showing an example of the configuration of the filter cloth in the filtration device. [Figure 3] Figure 1 is a view of the filtration device from the rear. [Figure 4] Figure 1 is a side view showing an example of the operation of the filtration device. [Figure 5] This is a side view showing the movement of the lower end of the filter cloth when the filtered material is discharged from the filtration device shown in Figure 1. [Figure 6] This figure shows another embodiment of the filter cloth. [Modes for carrying out the invention]

[0009] The embodiments will be described below with reference to the drawings. However, the present invention is not limited to the embodiments described below. Furthermore, throughout the following drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant descriptions thereof are omitted.

[0010] Figure 1 is a schematic side view showing an example of the configuration of a filtration device 100 according to an embodiment. The filtration device 100 is a device that filters a filter cloth 1 containing a raw liquid (slurry) by sandwiching it between a pair of filter plates and pressing it, and then removes the filtrate (dewatered cake) remaining inside the filter cloth 1. It is also called a filter press device. For example, the raw liquid is a mixture of red beans and the cooking liquid obtained by boiling red beans. The filtrate separated from the raw liquid is red bean paste. As shown in Figure 1, the filtration device 100 comprises a filter cloth 1 and a device body 3. First, an example of the configuration of the filter cloth 1 will be described, and then an example of the configuration of the device body 3 will be described.

[0011] [Example of filter cloth configuration] Figure 2 is a front view showing an example of the structure of the filter cloth 1. For the sake of explanation, the left side when viewed from the front will be simply referred to as "left," and the right side when viewed from the front will be simply referred to as "right." The filter cloth 1 is a tubular cloth. As shown in Figure 2, the filter cloth 1 includes a circumferential portion 11, an insertion hole 12, an upper opening 13, a lower opening 14, left and right notches 15a and 15b, multiple loops 16a, 16b, 16c, and 16d, multiple notches 17, and a string 18.

[0012] The peripheral portion 11 is made of a material that allows the 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 by folding the left and right ends of a rectangular piece of fabric to the back side and overlapping them, then gluing the overlapping portion together to form a cylindrical shape.

[0013] The circumferential portion 11 includes a front portion 21 and a back portion 22. The front portion 21 and the back portion 22 are continuous at the left edge 11a and right edge 11b of the circumferential portion 11, respectively. The front portion 21 is formed as a vertically elongated rectangle in a front view, with its longitudinal direction extending vertically and its short direction extending horizontally. The back portion 22 has the same contour as the front portion 21 in a front view. The back portion 22 faces the front portion 21, with its longitudinal direction extending vertically and its short direction extending horizontally.

[0014] Furthermore, an insertion hole 12 is formed in the front portion 21 of the circumferential portion 11, through which a nozzle 44, described later, for injecting the undiluted liquid is inserted. The insertion hole 12 is formed in a shape that the nozzle 44 fits into, and is, for example, a circular hole. In addition, an annular reinforcing cloth 12a is fixed around the insertion hole 12 of the front portion 21 to prevent tearing of the front portion 21.

[0015] Furthermore, the area demarcated by the upper end of the circumferential portion 11 is the upper opening 13. Moreover, the area demarcated by the lower end of the circumferential portion 11 is the lower opening 14. The circumferential 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 circumferential portion 11 outward and downward, overlapping it two or three or more times, and sewing the overlapped fabrics together. The lower folded portion 20 is formed by folding the lower end of the fabric constituting the circumferential portion 11 outward and upward, overlapping it two or three or more times, and sewing the overlapped fabrics together. This reinforces the upper and lower ends of the circumferential portion 11. Also, since 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 surfaces without steps. Furthermore, the upper and lower ends of the circumferential portion 11 shrink due to the tension of the stitching threads in the upper folded portion 19 and the lower folded portion 20, causing them to narrow. As a result, the internal space enclosed by the circumferential portion 11 becomes narrower at the upper and lower ends of the circumferential portion 11.

[0016] Furthermore, a pair of left and right notches 15a and 15b are formed, extending upward from the lower end of the left edge 11a and the lower end of the right edge 11b, respectively, of the circumferential surface portion 11. The notches 15a and 15b are formed, for example, by cutting a U-shape out of the lower end of the circumferential surface portion 11 by thermal cutting. The notches 15a and 15b penetrate the lower folded portion 20 in the vertical direction, with their upper ends positioned above the lower folded portion 20. With the formation of the notches 15a and 15b, the internal space surrounded by the circumferential surface portion 11 is opened at the upper and lower ends of the circumferential surface portion 11, and the narrowing at the upper and lower ends of the circumferential surface portion 11 is eliminated.

[0017] Furthermore, loops 16a, 16b, 16c, and 16d are formed at the four corners of the filter cloth 1. 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 the strip-shaped body to the circumferential portion 11.

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

[0019] And a plurality of cutout portions 17 are formed at the upper end of the peripheral surface portion 11. The cutout portion 17 is formed by cutting out the upper end of the peripheral surface portion 11 in a U shape by thermal fusing. And the cutout portion 17 is formed, for example, at the upper ends of the left edge 11a and the right edge 11b of the peripheral surface 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, and a total of four cutout portions 17 are formed. The upper end of the peripheral surface portion 11 is folded back, thereby forming a string passage portion 11c which is a cylindrical space extending in the circumferential direction of the peripheral surface portion 11 inside. The string passage portion 11c opens at the portion where the cutout portion 17 is formed. And using one cutout portion 17 as a string passage opening, a string 18 is inserted into the string passage portion 11c. The string 18 is inserted into the string passage portion 11c so as to go around the upper end of the peripheral surface portion 11, and both ends are tied. As a result, the string 18 is exposed from the plurality of cutout portions 17.

[0020] [Configuration Example of Apparatus Main Body] As shown in FIG. 1, the apparatus main 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 traction portions 42, and a housing 30. Further, the apparatus main body 3 includes a filter plate driving portion 35, an upper closing portion driving portion 37, a lower closing portion driving portion 39, and a raw liquid 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 to the first filter plate 31. Hereinafter, the direction from the second filter plate 32 toward the first filter plate 31 is simply referred to as "front", and the opposite direction is simply referred to as "back". The filter cloth 1 is arranged in the space between the surfaces of the first filter plate 31 and the second filter plate 32.

[0022] The fixed plate 33 extends in the vertical direction parallel to the first filter plate 31 and is arranged such that the surface of the fixed plate 33 abuts against the entire back surface of the first filter plate 31. The fixed plate 33 has rigidity that can withstand the reaction force generated during pressing and keeps the first filter plate 31 in a flat state during pressing. The movable plate 34 extends in the vertical direction parallel to the second filter plate 32 and is arranged such that the surface of the movable plate 34 abuts against the entire back surface of the second filter plate 32. The movable plate 34 has rigidity that can withstand the reaction force generated during pressing and keeps the second filter plate 32 in a flat state during pressing. Thus, the fixed plate 33 and the movable plate 34 are arranged so as to sandwich the first filter plate 31 and the second filter plate 32. The first filter plate 31 is attached to and supported by the fixed plate 33. Also, 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 second filter plate 32 toward and toward the first filter plate 31 by moving the movable plate 34 in the front-rear direction. The filter plate drive unit 35 includes an arm 35a and an actuator 35b. The base end of the arm 35a is connected to the actuator 35b and the tip end is connected to the movable plate 34. The actuator 35b is, for example, a hydraulic cylinder, and drives the arm 35a in the front-rear direction. In this embodiment, the device 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] Figure 3 is a rear view of the filtration device 100. In Figure 3, the movable plate 34 and the drive unit are omitted from the illustration. The upper closing part 36 and the lower closing part 38 are for pressing and closing the upper opening 13 and the lower opening 14 of the filter cloth 1, respectively. As shown in Figures 1 and 3, the upper closing part 36 is a rigid rod-shaped body located above the second filter plate 32 and extending across the lower part of the upper folded portion 19 at the upper end of the filter cloth 1 at the rear of the filter cloth 1. The lower closing part 38 is located below the second filter plate 32 and is a rigid rod-shaped body extending across the upper parts of the left notch 15a and the right notch 15b at the lower end of the filter cloth 1 at the rear of the filter cloth 1.

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

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

[0027] As shown in Figures 1 and 3, the suspension parts 40 suspend and hold the filter cloth 1 so that it is positioned in a predetermined location between the first filter plate 31 and the second filter plate 32. Multiple suspension parts 40 are provided so as to be positioned outside the multiple notches 17 of the filter cloth 1 when the filter cloth 1 is positioned in a predetermined location between the first filter plate 31 and the second filter plate 32. Each suspension part 40 includes a hook and a support frame that supports the hook. The filter cloth 1 is held suspended from the suspension parts 40 by hooking the hook of the suspension part 40 onto a string 18 exposed from the notches 17.

[0028] As shown in Figure 3, there are four traction sections 42, each 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 traction sections 42 are positioned in the lower left direction of the lower left loop 16a, the lower right direction of the lower right loop 16b, the upper left direction of the upper left loop 16c, and the upper right direction of the upper right loop 16d of the filter cloth 1 suspended from the suspension section 40. Each traction section 42 includes, for example, a coil spring with a hook at its tip and a support frame connected to the base end of the coil spring to support it.

[0029] As shown in Figure 1, the stock solution injection section 43 is a mechanism for injecting the stock solution into the filter cloth 1. The stock solution injection section 43 includes a nozzle 44 that extends through the fixing 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, the filtration procedure using the filtration device 100 will be explained. Figure 4 is a side view showing an example of the operation of the filtration device 100. Figure 5 is a side view showing the movement of the lower end of the filter cloth 1 when the filtered material A is discharged.

[0031] In the initial state, the upper closing section 36, the lower closing section 38, and the second filter plate 32 are positioned at an initial distance from the first filter plate 31. Figure 1 shows this initial state.

[0032] First, the worker hangs the strings 18 exposed from each notch 17 of the filter cloth 1 from each of the hanging parts 40 of the device body 3. In this way, the filter cloth 1 is suspended from the hanging parts 40 so that it is positioned in a predetermined location between the first filter plate 31 and the second filter plate 32.

[0033] Next, the worker attaches the lower left loop 16a, the lower right loop 16b, the upper left loop 16c, and the upper right loop 16d to the coil spring hooks of the corresponding traction units 42. As a result, as shown in Figure 3, the four corners of the filter cloth 1 are pulled outward, and the filter cloth 1 becomes taut. The two lower traction units 42 also pull the lower left loop 16a and the lower right loop 16b in a direction that separates them from each other, i.e., in the left-right direction. As a result, the lower end of the circumferential portion 11 is pulled in the left-right direction. When the lower end of the circumferential portion 11 is pulled in the left-right direction, the front portion 21 and the back portion 22 move closer together, and the lower opening 14 narrows in the front-rear direction. Furthermore, the worker inserts the 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 also moves the lower closing section 38 forward, pressing the lower end of the filter cloth 1 toward the first filter plate 31. As a result, the upper and lower ends of the filter cloth 1 are closed, forming a closed space for containing the raw liquid inside. Then, the raw liquid injection unit 43 injects a predetermined amount of raw liquid 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 raw liquid is compressed. The filtrate separated from the raw liquid permeates through the circumferential surface 11 and flows out from the inside to the outside of the filter cloth 1. Since the filter cloth 1 is taut due to the tension unit 42, it is possible to prevent the filter cloth 1 from twisting during compression.

[0036] Then, as the second filter plate 32 advances to its predetermined position and compression is complete, the filter plate drive unit 35 retracts the second filter plate 32 to its initial position. Furthermore, the upper closure unit 37 and the lower closure unit 39 retract the upper closure unit 36 ​​and the lower closure unit 38 to their initial positions, respectively. As a result, the lower opening 14 is opened, and the filtrate A remaining inside the filter cloth 1 descends toward the lower opening 14 due to its own weight. When the filtrate A approaches the lower opening 14, which has been narrowed by being pulled in the left-right direction by the traction unit 42, the filtrate A pushes the front part 21 and the back part 22 outward, i.e., in the front-back direction. As a result, the left notch 15a and the right notch 15b open, the gap between the lower end of the front part 21 and the lower end of the back part 22 widens, and the lower opening 14 expands. As a result, the filtrate A is smoothly discharged from the lower opening 14.

[0037] As described above, the filter cloth 1 has left notches 15a and right notches 15b that extend upward from the lower ends of the left edge 11a and right edge 11b of the circumferential surface 11, respectively. Therefore, when the filtered material A is discharged through the lower opening 14 after filtration, 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) Figure 6 shows another embodiment of the filter cloth, where (a) is a front view, (b) is a rear view, (c) is a top 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 section AA. In each figure, the part shown by a solid line is the part for which design registration is sought.

[0039] From the above description, many improvements and other embodiments of the present invention will be apparent to those skilled in the art. Therefore, the above description should be interpreted as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. The details of its structure and / or function can be substantially modified without departing from the spirit of the invention. [Explanation of Symbols]

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

Claims

1. A filter cloth for a filtration device, It extends in the vertical direction and has a front portion and a back portion opposite to the front portion, with the front portion and the back portion being continuous at both side edges, and the material of the circumferential portion being a fabric that allows filtrate to pass through, The lower end of the circumferential portion is demarcated, and a lower opening for discharging filtered material is provided. A filter cloth having a pair of notches extending upward from the lower ends of both side edges of the circumferential surface.

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

3. The filter cloth has a pair of loops for attaching it to the filtration device, One loop has one end fixed to one side edge of the lower end of the front portion, the portion extending from one end to the other passes outside one of the cutouts, and the other end is fixed to one side edge of the lower end of the rear portion. The filter cloth according to claim 1, wherein one end of the other loop is fixed to the other side edge portion of the lower end of the front portion, the portion extending from one end to the other end passes outside the other notch, and the other end is fixed to the other side edge portion of the lower end of the back portion.

4. The filter cloth according to claim 1, having an insertion hole formed in the circumferential portion through which a nozzle for injecting the undiluted liquid is inserted.

5. The filter cloth according to claim 1, having an upper opening partitioned by the upper end of the circumferential 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 drive unit moves the second filter plate toward and toward 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 cloth, The system includes a closing part drive unit that moves the closing part toward and toward the first filter plate, The aforementioned filter cloth is It extends in the vertical direction and has a front portion and a back portion opposite to the front portion, with the front portion and the back portion being continuous at both side edges, and a circumferential portion through which filtrate passes, The lower end of the circumferential portion is demarcated, and a lower opening for discharging filtered material is provided. A filtration device having a pair of notches extending upward from the lower ends of both side edges of the circumferential surface portion.

7. The filter cloth has a pair of loops, one end of which is fixed to one side edge of the lower end of the front portion, the portion extending from one end to the other passes outside one of the notches, and the other end is fixed to one side edge of the lower end of the back portion, the other end of which is fixed to the other side edge of the lower end of the front portion, the portion extending from one end to the other passes outside the other notch, and the other end is fixed to the other side edge of the lower end of the back portion. The filtration apparatus according to claim 6, further comprising a traction unit for pulling the pair of loops in a direction that moves them apart from each other.

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