Filtration device and filtration method

Abstract

To provide a filtering device and a filtering method capable of efficiently peeling off solid matter from a surface to which it is attached while preventing a filtering material from expanding into a storage space. [Solution] The filtration device 10 comprises a container 12 having a wall 44 that defines a storage space S for storing material to be treated, including solids and liquids, a filter section 18 having a filter medium 124 that captures solids and allows liquids to pass through, a liquid discharge port 40 for discharging the liquid that passes through the filter medium 124 to the outside of the storage space S, and stripping means 16 for stripping off solids that have been captured by the filter medium 124 and adhered to the inner surface of the wall 44. The stripping means 16 has gas injection ports 110 that inject gas onto the solids adhering to the inner surface of the wall 44, and at least one gas injection port 110 is opened in a solid adhesion region F on the inner surface of the wall 44 where solids are expected to adhere.

Description

[Technical Field]

[0001] The present invention relates to a filtering device and a filtering method for filtering an object to be treated. [Background technology]

[0002] An example of a conventional filtration device is disclosed in Patent Document 1 below. The sealed filtration and drying device (filtration device) of Patent Document 1 includes a vessel (container) having a storage space for storing slurry (material to be treated), a filter plate (filtering material) horizontally installed at the bottom of the vessel, and a smoothing arm for scraping and discharging cake (solid material) adhering to the upper surface of the filter plate. The vessel is provided at its top with a liquid supply port for supplying slurry to the storage space. The vessel is provided at its bottom with a supply port for supplying drying gas to the storage space and a filtrate discharge port for discharging filtrate (liquid material) that has passed through the filter plate to the outside.

[0003] In the closed-type filtration drying apparatus of Patent Document 1, when filtering a slurry, the slurry is supplied from a liquid supply port to a storage space and filtered by a filter plate. When drying a cake adhering to the filter plate, a drying gas is blown from the supply port through the filter plate onto the cake.

[0004] In the closed-type filtration drying apparatus of Patent Document 1, the cake can be dried using a drying gas, but no consideration was given to removing cake adhering to the inner surface of the vessel or the upper surface of the filter plate before the drying process. As a result, there was a problem in that it was difficult to transfer heat sufficiently to the inside of the cake during the drying process, resulting in poor drying efficiency.

[0005] It may also be possible to peel the cake from the filter plate by injecting high-pressure drying gas onto the cake from below the filter plate, but this could cause another problem: the pressure of the drying gas could cause the filter plate to bulge into the storage space. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 6-29611 Summary of the Invention

[0007] An object of the present invention is to provide a filtering device and a filtering method that can efficiently separate solid matter from a substrate while preventing the filter medium from expanding into the storage space.

[0008] In order to achieve the above object, the filtering device according to the present invention is characterized by comprising: a container having a wall portion constituting a storage space for storing a material to be processed, which contains solid matter and liquid matter; a filter portion provided in the container and having a filter material for capturing the solid matter and allowing the liquid matter to pass through; a liquid discharge port provided in the wall portion for discharging the liquid matter that passes through the filter material to the outside of the storage space; and peeling means for peeling off the solid matter that has been captured by the filter material and adhered to the inner surface of the wall portion, wherein the peeling means has a gas injection port for injecting gas onto the solid matter that has adhered to the inner surface of the wall portion, and at least one of the gas injection ports is The solid matter captured by the filter medium is expected to come into contact with and adhere to the filter medium when the solid matter is deposited. On the inner surface of the wall Ru The opening is in the area where the object is to be attached.

[0009] In this configuration, gas is injected from the gas injection port located in the area where solids are to adhere directly to the solids without passing through the filter material, preventing the filter material from expanding into the storage space due to gas pressure and efficiently removing solids from the inner wall surface.

[0010] Another feature of the filtration device according to the present invention is that Drying the solid material peeled off by the peeling means Dry A drying means; The solid material is peeled off by the peeling means. The peeling step and the Drying the solid matter with a drying means and a control unit for controlling the peeling means and the drying means so that the drying steps are performed in this order.

[0011] In this configuration,The control unit executes the peeling process before the drying process, and On the surface Since the adhering solid matter is peeled off, the entire solid matter can be efficiently dried by the drying means in the drying step.

[0012] Another feature of the filtration device according to the present invention is that the wall portion has a first portion and a second portion provided adjacent to the first portion so as to form a certain angle with respect to the first portion, and the liquid discharge port is provided in the first portion or the second portion, An opening is provided in the solid material attachment region. At least one of the gas injection ports is located at a boundary between the first portion and the second portion of the wall. Or, the shortest distance from the boundary to the inner periphery of the gas injection port is within 20 cm The opening faces the accommodation space.

[0013] In this configuration, the liquid discharge port is provided in the first section or the second section, so that the solid matter captured by the filter medium tends to adhere to the first section or the second section. Opening in the area where solid matter is to be attached At least one gas injection port is located at the boundary between the first and second portions of the wall. Or, the shortest distance from the boundary to the inner periphery of the gas injection port is within 20 cm Since the opening faces the storage space, the gas injected from the gas injection port can easily flow along the inner surface of at least one of the first and second parts, which prevents the filter medium from expanding into the storage space due to gas pressure and efficiently removes solid matter adhering to the first or second part.

[0014] Another feature of the filtration device according to the present invention is that At least one of the gas injection port and the liquid discharge port, which are opened in the region where the solid matter is to be attached, is located at the bottom of the container. The filter medium is provided in a liquid discharge path including the liquid discharge port. can The reason is that.

[0015] In this configuration, the solid matter captured by the filter medium provided in the liquid discharge passage is At the bottom of the container, the first and second portions Therefore, , th Boundary between part 1 and part 2 Or, the shortest distance from the boundary to the inner edge is within 20 cm The gas jetted from the gas jetting port opening in the first portion can efficiently peel off solid matter from the inner surface of at least one of the first portion and the second portion.

[0016] Another feature of the filtering device of the present invention is that it comprises a container state changing unit for holding the container and changing the state of the container, and a control unit for controlling the container state changing unit, wherein the container has a cylindrical peripheral wall portion constituting the first part and a lower wall portion constituting the second part by closing a lower opening of the peripheral wall portion, the liquid discharge outlet is provided at the lower part of the peripheral wall portion, and the control unit controls the container state changing unit to hold the container in a state where the positions of the inner surfaces of the peripheral wall portion and the lower wall portion are lowered toward the liquid discharge outlet during a filtration process for filtering the material to be treated.

[0017] In this configuration, the positions of the inner surfaces of the peripheral wall and the lower wall during the filtration process are lowered toward the liquid discharge port, so that the cross section of the solid matter captured and accumulated by the filter material when cut along a vertical plane passing through the center of the peripheral wall is a triangle with two sides that contact the peripheral wall and the lower wall. Therefore, the contact area between the inner surfaces of the peripheral wall and the lower wall and the solid matter is elongated in the direction along the two sides, and the gas injected from the gas injection port and flowing along the two sides can efficiently peel off the solid matter from the inner surfaces of the peripheral wall and the lower wall.

[0018] Another feature of the filtration device according to the present invention is that the gas injection port is covered with a porous body having a strength sufficient to withstand deformation due to the pressure of the gas and having a large number of ventilation holes large enough to prevent the passage of the solid matter.

[0019] In this configuration, the porous body can prevent foreign matter from entering the gas injection port. The porous body has enough strength to withstand deformation due to gas pressure, and therefore does not bulge inwardly into the storage space due to gas pressure.

[0020] In order to achieve the above-mentioned object, the filtering method according to the present invention is characterized in that it uses a filtering device comprising: a container having a wall portion that forms a storage space for storing material to be processed, including solids and liquids; a filter portion provided in the container and having a filter material that captures the solids and allows the liquids to pass through; a liquid discharge port provided in the wall portion for discharging the liquid that passes through the filter material to the outside of the storage space; and a peeling means having at least one gas injection port opened on the inner surface of the wall portion, and the filtering method comprises: a filtering step in which the solids are captured by the filter material, thereby depositing the solids on the inner surface of the wall portion so as to cover at least one of the gas injection ports, and discharging the liquid that has passed through the filter material from the liquid discharge port; and a peeling step in which the peeling means is operated to spray the gas from at least the gas injection port covered with the solids, thereby peeling the solids from the inner surface of the wall portion.

[0021] In this configuration, the gas injected from the gas injection port covered with solids hits the solids directly without passing through the filter material, so that the filter material is prevented from expanding into the storage space due to the gas pressure, and the solids can be efficiently peeled off from the inner surface of the wall.

[0022] Another feature of the filtering method according to the present invention is that the wall portion has a first portion and a second portion provided adjacent to the first portion so as to form a certain angle with respect to the first portion, and the liquid discharge port is provided in the first portion or the second portion, Covered with the solid At least one of the gas injection ports is located at a boundary between the first portion and the second portion of the wall. Or, the shortest distance from the boundary to the inner periphery of the gas injection port is within 20 cm and in the filtering step, At least one The solid material is deposited on the inner surface of the wall portion so as to cover the gas injection port.

[0023] In this configuration, covered with solid matter At least one gas injection port is located at the boundary between the first and second portions of the wall. Or, the shortest distance from the boundary to the inner periphery of the gas injection port is within 20 cmSince the opening faces the storage space, the gas injected from the gas injection port can flow between the inner surface of at least one of the first and second parts and the solid matter adhering to that inner surface. Therefore, the filter medium can be prevented from expanding into the storage space due to the pressure of the gas, and the solid matter can be efficiently separated from the inner surface of at least one of the first and second parts.

[0024] Another feature of the filtration method according to the present invention is to provide a container state changing unit that holds the container and changes the state of the container, At least one of the gas injection port and the liquid discharge port covered with the solid material is The filter is provided at the bottom of the container, and the filter material is provided in a liquid discharge path including the liquid discharge outlet, and during the filtering process, the container state change unit is operated to hold the container in a state where the positions of the inner surfaces of the first part and the second part are lowered toward the liquid discharge outlet.

[0025] In this configuration, the positions of the inner surfaces of the first and second parts during the filtration process become lower toward the liquid discharge port, so the cross-sectional shape of the solids captured and deposited by the filter medium becomes a triangle with two sides contacting the peripheral wall and the lower wall. Therefore, the contact area between the inner surfaces of the first and second parts and the solids becomes longer in the directions along the two sides, and the gas injected from the gas injection port and flowing along the two sides can efficiently peel off the solids from the inner surfaces of the first and second parts. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a front view showing a configuration of a filtering device according to an embodiment. [Figure 2] FIG. 2 is a rear view showing the configuration of the filtering device according to the embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 2 is a piping diagram showing a piping system of the filtering device according to the embodiment. [Figure 5]5(A) is a plan view showing the configuration of the main part of the filtration device, (B) is a cross-sectional view taken along line VB-VB in FIG. 5(A), and (C) is an enlarged view of the K1 portion in FIG. 5(B). [Figure 6] 5A is a cross-sectional plan view showing the arrangement of gas injection ports, and FIG. 5B is an enlarged view of the K2 portion in FIG. 5B. [Figure 7] FIG. 2 is a process diagram showing each step of the filtration method according to the embodiment. [Figure 8] (A) is a diagram showing the adding step, and (B) is a diagram showing the filtration preparation step. [Figure 9] (C) is a diagram showing the filtration step, and (D) is a diagram showing the peeling step. [Figure 10] (E) is a diagram showing the drying process, and (F) is a diagram showing the discharging process. [Figure 11] FIG. 10(A) is a diagram showing a first modified example of the peeling step, and FIG. 10(B) is a diagram showing a second modified example of the peeling step. [Figure 12] 10(A) is a cross-sectional view showing the configuration of a filtration device according to another embodiment, and FIG. 10(B) is a partially enlarged cross-sectional view showing a discharging process. [Figure 13] FIG. 10(A) is a cross-sectional view showing the configuration of a filtration device according to still another embodiment, and FIG. 10(B) is a partially enlarged cross-sectional view showing the discharging process. [Figure 14] 1A is a planar cross-sectional view showing the configuration of a peeling means according to a first modified example, and FIG. 1B is a cross-sectional view showing the configuration of a peeling means according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, a filtering device and a filtering method according to an embodiment of the present invention will be described with reference to the drawings.

[0028] (Filtering device according to an embodiment) FIG. 1 is a front view showing the configuration of a filtration device 10 according to an embodiment. FIG. 2 is a rear view showing the configuration of the filtration device 10. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1, showing the configuration of the filtration device 10. FIG. 4 is a piping diagram showing the piping system of the filtration device 10. FIG. 5(A) is a plan view showing the configuration of the main parts of the filtration device 10, FIG. 5(B) is a cross-sectional view taken along line VB-VB in FIG. 5(A), and FIG. 5(C) is an enlarged view of a portion K1 in FIG. 5(B). FIG. 6(A) is a cross-sectional view showing the arrangement of the gas injection ports 110, and FIG. 6(B) is an enlarged view of a portion K2 in FIG. 5(B). The height of the cut surface (the surface indicated by solid hatching) in the cross-sectional view of FIG. 6(A) is the same as the height of the upper surface of the lower wall portion 30. The region F indicated by dashed hatching in FIG. 6(A) is a "solid matter adhesion region" where solid matter W1 is expected to adhere in the filtration process shown in FIG. 9(C).

[0029] In the following description, the directions of "front, back, left, right, up, and down" correspond to the directions indicated by arrows in the drawings. The front view (FIG. 1) is a view of the filtration device 10 as seen from the front, and the rear view (FIG. 2) is a view of the filtration device 10 as seen from the rear.

[0030] 1, 2, 3, and 4 is an apparatus for carrying out each step (FIG. 7) of a filtration method described later in a chemical plant or the like. As shown in FIG. 3, the filtration device 10 includes a container 12 having a storage space S for storing a workpiece W (FIG. 8(A)) containing solid matter and liquid matter, a peeling means 16, a filter unit 18, and an agitator 20. As shown in FIG. 4, the filtration device 10 also includes a container state change unit 22 and a control unit 24.

[0031] The state of the workpiece W may include a state containing both solids and liquids, a state containing only solids, or a state containing only liquids. The state containing only solids will be specifically referred to as "solids W1."

[0032] 5(B), the container 12 has a cylindrical peripheral wall portion 26 extending in the vertical direction, a disk-shaped upper wall portion 28 provided at the upper end of the peripheral wall portion 26 to close the upper opening, and a disk-shaped lower wall portion 30 provided at the lower end of the peripheral wall portion 26 to close the lower opening. The peripheral wall portion 26, the upper wall portion 28, and the lower wall portion 30 are formed of a metal such as stainless steel, and together they form a bottomed cylindrical wall portion 44 of the container 12. That is, in this embodiment, the peripheral wall portion 26, the upper wall portion 28, and the lower wall portion 30 each form part of the wall portion 44 that defines the storage space S.

[0033] Here, the "vertical direction" refers to the vertical direction determined based on the state of the container 12 when the center line L of the container 12 is placed parallel to the vertical direction, and does not refer to the vertical direction. Therefore, if the container 12 is tilted with respect to the vertical direction, the "vertical direction" becomes a direction intersecting the vertical direction.

[0034] A solid discharge port 32 is formed in a forward-facing portion of the lower part of the peripheral wall portion 26 for discharging solid matter W1 (FIG. 10(F)) captured by the filter medium 124 to the outside of the storage space S. A cylindrical solid matter discharge nozzle 34 made of a metal such as stainless steel is provided in the solid matter discharge port 32 so as to protrude outward. In this embodiment, the solid matter discharge nozzle 34 constitutes a "solid matter discharge section" that constitutes a solid matter discharge path U for discharging solid matter W1 to the outside of the storage space S, and the solid matter discharge port 32 constitutes an upstream opening of the solid matter discharge path U.

[0035] A lid 36 is detachably attached to the solids discharge nozzle 34. The lid 36 has a disk-shaped lid plate 36a and a cylindrical core 36b with a bottom joined to the lid plate 36a. The core 36b is configured to fill the internal space of the solids discharge nozzle 34. The lid plate 36a is fixed to a flange 34a provided at the tip of the solids discharge nozzle 34 using a clamp 38.

[0036] A liquid discharge port 40 is formed in a rearward-facing portion of the lower part of the peripheral wall 26, for discharging the liquid (filtrate) of the material W to be treated that passes through the filter medium 124 of the filter section 18 to the outside of the storage space S. A cylindrical liquid discharge nozzle 42 made of a heat-conductive metal such as stainless steel is provided at the liquid discharge port 40 so as to protrude outward. A flange 42a is formed at the tip of the liquid discharge nozzle 42. In this embodiment, the liquid discharge nozzle 42 forms a "liquid discharge section" that constitutes the liquid discharge path V for discharging the liquid (filtrate) to the outside of the storage space S, and the liquid discharge port 40 forms the inlet (upstream opening) of the liquid discharge path V. Therefore, the liquid discharge path V includes the liquid discharge port 40.

[0037] 5(C), the base end of the liquid discharge nozzle 42 is joined by welding or the like to the inner periphery of the liquid discharge port 40. An annular protrusion 42b is formed on the inner periphery of the base end of the liquid discharge nozzle 42 to position the tip of the support 126 that constitutes the filter section 18. The protrusion 42b is connected to the peripheral wall section 26 via the base end of the liquid discharge nozzle 42, and forms part of the wall section 44 that constitutes the storage space S.

[0038] As shown in Figure 5(B), a shaft through-hole 52 through which the drive shaft 144 of the agitator 20 is inserted is formed in the center of the upper wall 28, and an inlet 54 for introducing the workpiece W (Figure 8(A)) into the storage space S and an instrument mounting hole 56 are formed in a portion off the center of the upper wall 28. A cylindrical nozzle 58 is connected to the inlet 54, and a lid 60 is detachably attached to the tip of the nozzle 58. A gauge 62 such as a pressure gauge is attached to the instrument mounting hole 56.

[0039] 5(A), two sight window mounting holes 64a, 64b and two hose connection holes 66a, 66b are further formed in a portion off the center of the upper wall portion 28. Sight windows 68a, 68b are attached to the sight window mounting holes 64a, 64b.

[0040] 4, downstream ends of gas supply hoses 70a, 70b are connected to hose connection holes 66a, 66b. Upstream ends of gas supply hoses 70a, 70b are connected to a gas source 74 that discharges high-pressure gas such as nitrogen gas via an on-off valve 72. Control unit 24 is electrically connected to on-off valve 72, and on-off valve 72 is controlled in response to a control signal provided by control unit 24.

[0041] The peeling means 16 shown in Fig. 5(B) is a means for peeling off solid matter W1 (Fig. 9(D)) that has been captured by the filtering material of the filter section 18 and adhered to the inner surface of the wall section 44, and has a first jacket 46 and a second jacket 48. Also, as shown in Fig. 5(A), the peeling means 16 has gas injection nozzles 50a and 50b.

[0042] The first jacket 46 and the second jacket 48 are a "heating device for peeling" for heating the contact area X of the solid material W1 (Figure 9(D)) adhering to the inner surface of the wall portion 44 to peel off the solid material W1, and also a "heating device for drying the peeled off solid material W1.

[0043] As shown in Fig. 5(B), the first jacket 46 has a jacket body 46a formed along the outer surface of the peripheral wall portion 26, and a heat medium flow path 76 through which the heat medium flows is formed between the peripheral wall portion 26 and the jacket body 46a. As shown in Fig. 5(A), a heat medium inlet 80a and a heat medium outlet 80b are provided in the jacket body 46a at an interval.

[0044] As shown in Fig. 4, the downstream end of a heat medium supply pipe 82a is connected to the heat medium inlet 80a, and the upstream end of a heat medium discharge pipe 82b is connected to the heat medium outlet 80b. The upstream end of the heat medium supply pipe 82a is connected to a discharge port 84a of a pump 84. A hot water source 88 is connected to a suction port 84b of the pump 84 via an on-off valve 86 and the like, and a cold water source 92 is connected to the suction port 84b of the pump 84 via an on-off valve 90 and the like. Therefore, when the on-off valve 86 is open and the on-off valve 90 is closed, hot water can be supplied to the first jacket 46 (Fig. 5(B)). On the other hand, when the on-off valve 86 is closed and the on-off valve 90 is open, cold water can be supplied to the first jacket 46.

[0045] 4, the control unit 24 is electrically connected to the pump 84, and the pump 84 is driven or stopped in response to a control signal given from the control unit 24. The control unit 24 is also electrically connected to the on-off valves 86, 90, and the on-off valves 86, 90 are controlled in response to a control signal given from the control unit 24. The type of heat medium is not limited to hot water and cold water, and steam, temperature-controlled oil, gas, etc. may also be used.

[0046] As shown in Fig. 5(B), the second jacket 48 has a jacket body 48a formed along the outer surface of the lower wall portion 30, and a heat medium flow path 78 through which the heat medium flows is formed between the lower wall portion 30 and the jacket body 48a. A heat medium inlet 98a and a heat medium outlet 98b shown in Fig. 5(A) are provided in the jacket body 48a at an interval from each other.

[0047] 4, the downstream end of a heat medium supply pipe 100a is connected to the heat medium inlet 98a, and the upstream end of a heat medium discharge pipe 100b is connected to the heat medium outlet 98b. The upstream end of the heat medium supply pipe 100a is connected to the discharge port 84a of the pump 84. Therefore, the pump 84 can supply the same type of heat medium to the first jacket 46 and the second jacket 48 simultaneously.

[0048] 5(B), the peripheral wall 26 and the lower wall 30 of the container 12 are heated or cooled by the heat medium. Also, the upper wall 28 connected to the peripheral wall 26, and the base end and protrusion 42b of the liquid material discharge nozzle 42 are heated or cooled. In other words, the entire wall 44 constituting the storage space S is heated or cooled. As a result, heat exchange occurs between the workpiece W stored in the storage space S and the wall 44, and the workpiece W is heated or cooled.

[0049] The gas injection nozzles 50a and 50b shown in Fig. 5(A) are "gas injection devices for removal" that inject gas at solid matter W1 (Fig. 9(D)) that has been captured by the filter medium 124 of the filter section 18 and adhered to the inner surface of the wall section 44 or the surface of the filter medium 124, thereby removing the solid matter W1. The two gas injection nozzles 50a and 50b have the same configuration.

[0050] As shown in FIG. 6(B), one gas injection nozzle 50a has a nozzle body 102, a porous body 104, a sleeve pipe 106, and a nut 108.

[0051] The nozzle body 102 is a cylindrical member that forms a gas flow path R. A gas injection port 110 is formed at the tip end of the nozzle body 102, and a gas supply port 112 is formed at the base end of the nozzle body 102. An annular recess 102a is formed in the tip surface (upper end surface) of the nozzle body 102, into which a porous body 104 is attached. An annular groove 102b is formed in the outer peripheral surface of the tip end of the nozzle body 102, into which an O-ring 114 is attached. An internal thread 102c is formed in the inner peripheral surface of the base end of the nozzle body 102, into which the external thread of a gas supply hose 120a (FIG. 4) is joined. A flange 102d is formed in the outer peripheral surface of the base end of the nozzle body 102, which abuts against the base end surface (lower end surface) of the sleeve tube 106.

[0052] The porous body 104 is a member having a large number of ventilation holes large enough to block the solid matter W1, and is strong enough not to be deformed by the pressure of the gas supplied from the gas source 74. In this embodiment, the porous body 104 is a sintered wire mesh formed in a disk shape, and is fitted and fixed in the recess 102a of the nozzle body 102. In other words, the gas injection port 110 of the nozzle body 102 is covered with the porous body 104. Note that the type of porous body 104 is not limited to sintered wire mesh; for example, a filter cloth made of woven or nonwoven fabric reinforced with a reinforcing material may also be used. The porous body 104 may be fixed by welding.

[0053] The sleeve pipe 106 is a cylindrical member into which the nozzle body 102 is inserted so as to be freely insertable and removable, and a male thread 106a is formed on the outer peripheral surface of the base end of the sleeve pipe 106. The sleeve pipe 106 is inserted into a through hole 116 formed in the lower wall portion 30 and a through hole 118 formed in the jacket body 48a of the second jacket 48, and is joined to the lower wall portion 30 and the jacket body 48a by welding or the like. In this state, the tip end surface (upper end surface) of the sleeve pipe 106 is flush with the upper surface of the lower wall portion 30.

[0054] The nut 108 has an internal thread 108a that screws onto the external thread 106a of the sleeve pipe 106, and an abutment portion 108b that abuts against the flange 102d of the nozzle body 102. When the internal thread 108a of the nut 108 is screwed onto the external thread 106a of the sleeve pipe 106 with the nozzle body 102 inserted inside the sleeve pipe 106, the flange 102d of the nozzle body 102 is clamped between the base end surface (lower end surface) of the sleeve pipe 106 and the abutment portion 108b of the nut 108, and the nozzle body 102 is fixed to the sleeve pipe 106.

[0055] With the nozzle body 102 fixed to the sleeve pipe 106, the tip surface (upper end surface) of the nozzle body 102 and the upper surface of the porous body 104 are flush with the upper surface of the lower wall portion 30, and the gas ejection port 110 opens on the upper surface of the lower wall portion 30, i.e., on the inner surface of the wall portion 44, facing the accommodation space S. The gap between the outer peripheral surface of the nozzle body 102 and the inner peripheral surface of the sleeve pipe 106 is sealed with an O-ring 114.

[0056] 4, downstream ends of gas supply hoses 120a and 120b are connected to gas injection nozzles 50a and 50b. Upstream ends of gas supply hoses 120a and 120b are connected to gas source 74, which discharges high-pressure gas such as nitrogen gas, via on-off valve 122. Control unit 24 is electrically connected to on-off valve 122, and on-off valve 122 is controlled in response to a control signal provided by control unit 24.

[0057] As shown in FIG. 6(A), the gas injection ports 110 of the gas injection nozzles 50a, 50b constituting the peeling means 16 are opened in a solid matter adhesion region F on the upper surface (inner surface) of the lower wall portion 30 (wall portion 44). As described above, the solid matter adhesion region F is a region where solid matter W1 is expected to adhere in the filtration step shown in FIG. 9(C). The extent of the solid matter adhesion region F varies depending on the input amount of the workpiece W, the shape and size of the container 12, and the inclination angle of the container 12 with respect to the horizontal plane in the filtration step, but can be determined in advance by prior experiments or desk calculations.

[0058] For example, in an experimental machine (modified example) in which the upper wall portion 28 is formed in a dome shape, when the diameter D1 of the lower wall portion 30 is 45 cm, the height of the peripheral wall portion 26 is 60 cm, and the volume of the container 12 (storage space S) including the inner space of the dome-shaped upper wall portion 28 is 108 L, the input amount of the workpiece W is 4200 cm 3 ~Upper limit 35800cm 3The upper limit of the amount of material W to be treated is set within the range of 3.89% to 33.15% of the volume of the container 12 (storage space S). The lower limit of the amount of material W to be treated is approximately the minimum amount at which the filter medium 124 is covered by the solid matter W1 in the material W to be treated and is not exposed to the storage space S when the container 12 is tilted at a 45-degree angle during the filtration process. This prevents pressure from escaping from the exposed parts of the filter medium 124 during the filtration process, thereby improving filtration efficiency. The upper limit of the amount of material W to be treated is approximately the amount at which the material W to be treated does not come into contact with the filter medium 124 when the container 12 is tilted at an angle (for example, -45 degrees) during the filtration preparation process shown in FIG. 8(B), and is approximately the amount at which the minimum required clean area Q can be secured in the upper part of the storage space S when the container 12 is tilted at an angle between -45 degrees and +45 degrees. The user can calculate in advance the range of the area F where solid matter is expected to adhere based on the amount of material W to be treated determined within the above range, the amount of solid matter W1 to be captured by the filter material 124, and the inclination angle of the container 12 during the filtration process (e.g., 45 degrees).

[0059] 6(A), when the peripheral wall 26 of the wall 44 of the container 12 is defined as the "first portion" and the lower wall 30 is defined as the "second portion," the peripheral wall 26 (first portion) and the lower wall 30 (second portion) are adjacent to each other at a certain angle (90 degrees in this embodiment), and the liquid material discharge port 40 is provided in the peripheral wall 26 (first portion). The gas injection ports 110 of the gas injection nozzles 50a, 50b are opened to face the storage space S at a boundary E between the peripheral wall 26 (first portion) and the lower wall 30 (second portion) of the wall 44 or a portion nearby (a portion nearby the boundary E in the lower wall 30 in this embodiment) from the viewpoint of making it easier for the injected gas to flow along at least one of the peripheral wall 26 (first portion) and the lower wall 30 (second portion). At least one gas injection port 110 opened at the boundary portion E or a portion in the vicinity thereof is disposed in the vicinity of the liquid material discharge port 40.

[0060] As shown in Figure 6(A), when an imaginary circle T is assumed to be centered on the center line L of the container 12 and to have a diameter D2 that is half the diameter D1 of the lower wall portion 30, in this embodiment, the area outside the imaginary circle T on the lower wall portion 30 is regarded as the area near the boundary portion E, and the gas injection port 110 is opened.

[0061] In the portion of the wall 44 near the boundary E, for example, the shortest distance from the boundary E to the inner peripheral edge of the gas injection port 110 is preferably within 20 cm, more preferably within 10 cm, and most preferably within 5 cm. The inner peripheral edge of the gas injection port 110 may be in contact with the wall 44 (the peripheral wall 26 in this embodiment), or may be 1 cm or more, or 3 cm or more away from the wall 44.

[0062] 6(B), the gas flow path R of the nozzle body 102 constituting the gas injection nozzle 50a is perpendicular to the upper surface of the lower wall portion 30 and extends parallel to the axis of the peripheral wall portion 26 (first portion), i.e., the center line L of the container 12. As described above, the gas injection port 110 opens in the vicinity of the boundary portion E of the lower wall portion 30, facing the storage space S. Therefore, the gas injected from the gas injection port 110 easily flows in the axial direction along the inner surface of the peripheral wall portion 26 (first portion), and easily peels off solid matter W1 adhering to the inner surface of the peripheral wall portion 26 (first portion) and the surface of the filter medium 124.

[0063] The direction in which the gas flow path R of the nozzle body 102 extends does not necessarily have to be parallel to the center line L of the container 12, and may be changed as appropriate within the range in which the gas ejected from the gas injection port 110 forms a flow along the inner surface of the peripheral wall portion 26 (first portion).

[0064] The filter unit 18 shown in FIG. 5(B) is a member provided in the container 12 for filtering the material to be treated W (FIG. 8(A)). As shown in FIG. 5(C), the filter unit 18 has a filter medium 124 provided in the liquid discharge path V at the opening on the base end side of the liquid discharge nozzle 42, and a support 126 that supports the filter medium 124 inside the liquid discharge nozzle 42. The filter medium 124 is a member having a large number of holes that capture solid matter W1 and allow the liquid to pass through. The type of filter medium 124 is not particularly limited, and a filter cloth (woven fabric, nonwoven fabric), sintered wire mesh, etc. can be appropriately selected and used.

[0065] The support 126 has a filter plate portion 128 that contacts the surface of the filter medium 124 facing outward from the storage space S, and a cylindrical clamping portion 130 that is fitted inside the liquid discharge nozzle 42 and cooperates with the protrusion 42b of the liquid discharge nozzle 42 to clamp the outer periphery of the filter medium 124. The entire support 126 is made of a heat-conducting metal such as stainless steel.

[0066] The filter plate portion 128 is formed to a size that can block the opening of the liquid discharge nozzle 42, and the filter plate portion 128 is formed with a large number of through holes 128a to allow the liquid (filtrate) contained in the workpiece W to pass through.

[0067] The clamping portion 130 is formed integrally with the filter plate portion 128, and a groove 132 is formed on the outer peripheral surface of the clamping portion 130. An O-ring 134 is attached to the groove 132 to seal the gap between the inner peripheral surface of the liquid discharge nozzle 42 and the outer peripheral surface of the clamping portion 130. An annular recess 136 is formed on the tip surface of the clamping portion 130, and the outer peripheral portion of the filter medium 124 is pressed into and fixed in the recess 136 by a PTFE spacer (a rod with a square cross section) 138.

[0068] 5(B), a lid 140 having a discharge pipe connection hole 140a and a handle 140b is joined to the base end of the clamping part 130, and the lid 140 is fixed to the flange 42a of the liquid discharge nozzle 42 via a clamp 142. Therefore, after removing the clamp 142, the operator can remove the entire support 126 and filter medium 124 from the liquid discharge nozzle 42 by pulling the handle 140b with their hands.

[0069] The agitation device 20 shown in FIG. 5(B) is a device for agitating the workpiece W in the accommodation space S, and includes a drive shaft 144, an agitation blade 146, and a drive motor 148.

[0070] The drive shaft 144 is a rod-shaped member that extends in the axial direction of the container 12 in the storage space S. A stirring blade 146 is attached to the lower end of the drive shaft 144. A rotating shaft (not shown) of a drive motor 148 is connected to the upper end of the drive shaft 144. As shown in FIG. 4, the control unit 24 is electrically connected to the drive motor 148, and the drive motor 148 rotates or stops in response to a control signal given from the control unit 24.

[0071] The container state change unit 22 shown in Figure 1 is a member for changing the state of the container 12, and has a pair of stands 150a, 150b arranged on both the left and right sides of the container 12, a pair of bearing units 152a, 152b, a pair of rotating shafts 154a, 154b, and a rotating operation unit 156.

[0072] Each of the pair of mounts 150a, 150b is formed by joining rod-shaped bases 158a, 158b having a rectangular cross section and rod-shaped supports 160a, 160b also having a rectangular cross section in an inverted T shape. The bases 158a, 158b are arranged to extend in the front-rear direction, and the supports 160a, 160b are arranged to extend in the vertical direction. Bearings 152a, 152b are provided at the upper ends of the supports 160a, 160b.

[0073] Each of the pair of rotation shafts 154a, 154b is a rod-shaped member having a common rotation center that extends in the left-right direction in a horizontal plane. The left end of the right rotation shaft 154a is joined to the right side surface of the container 12, and the right end of the left rotation shaft 154b is joined to the left side surface of the container 12. The right end of the right rotation shaft 154a is rotatably supported by the bearing portion 152a, and the left end of the left rotation shaft 154b is rotatably supported by the bearing portion 152b.

[0074] The rotation operation unit 156 is a part that changes the inclination angle of the container 12 by rotating the right-side rotation shaft 154a, and has a gear unit 162 incorporated in the right-side bearing part 152a, a drive motor 164 for inputting a rotational force to the input end of the gear unit 162, and a manual handle 166 for inputting a rotational force to the input end of the gear unit 162. The output end of the gear unit 162 is connected to the right-side rotation shaft 154a.

[0075] 4, the control unit 24 is electrically connected to the drive motor 164, and the drive motor 164 rotates or stops in response to a control signal given from the control unit 24. The container state changing unit 22 of this embodiment is configured to execute each holding process shown in FIG. 7 in response to a control signal given from the control unit 24.

[0076] The rotation operation unit 156 may be configured to rotate the left rotation shaft 154b to change the tilt angle of the container 12. The user may also change the tilt angle of the container 12 by turning the manual handle 166 to rotate the rotation shaft 154a.

[0077] 4 is a device that controls each electrical device for operating the filtering device 10, and is configured by a microcomputer (not shown) that includes a CPU, ROM, RAM, a timer, etc. The ROM stores operation programs for each electrical device.

[0078] (Filtration method according to an embodiment) Fig. 7 is a process diagram showing each step of the filtration method according to the embodiment. Fig. 8(A) is a diagram showing the loading step, and Fig. 8(B) is a diagram showing the filtration preparation step. Fig. 9(C) is a diagram showing the filtration step, and Fig. 9(D) is a diagram showing the peeling step. Fig. 10(E) is a diagram showing the drying step, and Fig. 10(F) is a diagram showing the discharging step.

[0079] As shown in FIG. 7, when filtering the workpiece W using the filtration device 10, the processing of the workpiece W involves a loading step, a filtration preparation step (dissolving step and crystallization step), a filtration step, a peeling step, a drying step, and a discharge step, in this order. Furthermore, the container 12 involves holding the workpiece W, a loading and holding step, a filtration preparation and holding step, a filtration and holding step, a peeling and holding step, a drying and holding step, and a discharge and holding step, in this order. In other words, the filtration method according to this embodiment includes six processing steps for processing the workpiece W and six holding steps for holding the container 12. The processing steps and holding steps are performed in parallel in correspondence with each other. Therefore, the loading step, filtration preparation step, filtration step, peeling and holding step, and discharge and holding steps may be recognized as a broader concept that includes the loading and holding step, the filtration preparation and holding step, the filtration and holding step, the peeling and holding step, the drying and holding step, and the discharge and holding step.

[0080] The "container state" shown in Fig. 7 is a state related to the attitude of the container 12, and the state of the container 12 corresponding to each processing step is shown in a conceptual diagram in Fig. 7. In each holding step, the control unit 24 (Fig. 4) controls the drive motor 164 of the container state changing unit 22 to appropriately switch the state of the container 12 and hold the container 12 in the switched state.

[0081] 7 refers to the state of the agitator blades 146, specifically, either rotating or stopped. The control unit 24 (FIG. 4) controls the drive motor 148 of the agitator 20 to appropriately switch the state of the agitator 20 according to each processing step and to maintain the switched state.

[0082] 7 refers to the supply state of the heat medium (hot water or cold water) to the first jacket 46 and the second jacket 48. The control unit 24 (FIG. 4) controls the pump 84 and the on-off valves 86, 90 to appropriately switch the supply state of the heat medium according to each treatment step and to maintain the switched state.

[0083] The "filtration preparation step" shown in Fig. 7 is a step of preparing a workpiece W containing solid and liquid matter in the filtration preparation region M (Fig. 8(B)) of the container 12 in a filtration preparation state, and includes a dissolving step and a crystallization step. That is, in this embodiment, the workpiece W containing solid and liquid matter is prepared by the dissolving step and the crystallization step.

[0084] Each processing step and each holding step will be described below with reference to Figures 7, 8, 9, and 10. The area indicated by dashed hatching in the figures is a clean area Q where no workpiece W is present during any of the steps from the loading step to the discharge step and at any transitions between these steps. In other words, the filtration device 10 is configured to execute all of the steps from the loading step to the discharge step while maintaining the clean area Q in the accommodation space S. The loading amount of the workpiece W during the loading step is determined so as to maintain the clean area Q.

[0085] 5(A) and (B), in this embodiment, the shaft through-hole 52, the inlet 54, the meter mounting hole 56, the sight glass mounting holes 64a, 64b, and the hose connection holes 66a, 66b are formed in the upper wall portion 28 of the container 12, and it is necessary to prevent the workpiece W from adhering to these. Therefore, in each holding step, the control unit 24 (FIG. 4) controls the drive motor 164 of the container state changing unit 22 so as to ensure a clean region Q in the region in the storage space S where these are located.

[0086] The control unit 24 (FIG. 4) starts control operations for each processing step and each holding step in response to an input signal from a drive switch operated by the user, and stops control operations for each processing step and each holding step in response to an input signal from a stop switch operated by the user. The user operates the drive switch and the stop switch while visually checking the condition inside the storage space S through the viewing windows 68a, 68b.

[0087] (Input process) 7 is a step of putting the workpiece W into the accommodation space S of the container 12. When the putting step is performed, the putting and holding step is started before the putting step.

[0088] As shown in Fig. 8(A), in the loading and holding step, the control unit 24 (Fig. 4) controls the drive motor 164 of the container state changing unit 22 so as to hold the container 12 in the loaded state. Here, the loaded state is a state of the container 12 in which the center line L extends vertically. In this embodiment, the loading step is performed with the container 12 in the loaded state.

[0089] As shown in Fig. 7, in the loading step, the control unit 24 (Fig. 4) controls the drive motor 148 to stop the agitator 20, and controls the pump 84 and the on-off valves 86 and 90 to stop the supply of the heat medium. As shown by the arrow in Fig. 8(A), the user loads the workpiece W into the storage space S from the nozzle 58 of the container 12, and then attaches the lid 60 (Fig. 5(B)) to the nozzle 58. In this embodiment, the workpiece W loaded into the storage space S includes a liquid material and a solid material.

[0090] (melting process) The dissolving process shown in Fig. 7 is a process of dissolving solid matter of the workpiece W introduced into the storage space S into a liquid to produce a solution. When the dissolving process is performed, the filtration preparation holding process is started before the dissolving process.

[0091] As shown in Fig. 8(B), in the filtration preparation holding step, the control unit 24 (Fig. 4) controls the drive motor 164 of the container state changing unit 22 to switch the state of the container 12 from the loading state to the filtration preparation state and to hold the container 12 in the filtration preparation state. In this embodiment, the control unit 24 controls the drive motor 164 of the container state changing unit 22 to rotate the container 12, which is in the loading state shown in Fig. 8(A), 45 degrees counterclockwise from the state shown in the figure and stop it. Therefore, the inclination angle of the container 12 with respect to the horizontal plane becomes 45 degrees.

[0092] Here, the filtration preparation state refers to a state of the container 12 in which a filtration preparation region M for preparing a workpiece W (filter target) containing solid matter is provided in an area vertically below the filter unit 18 in the storage space S, and a clean region Q is provided in an area vertically above the filter unit 18 in the storage space S. In the filtration preparation state, the stirring blades 146 of the stirring device 20 are arranged in the filtration preparation region M. The dissolving process is performed in the container 12 in the filtration preparation state.

[0093] Note that "vertically below filter unit 18" means below filter unit 18 in the vertical direction, and does not mean only directly below the filter unit. Also, "vertically above filter unit 18" means above filter unit 18 in the vertical direction, and does not mean only directly above the filter unit.

[0094] 7, in the dissolving step, the control unit 24 (FIG. 4) controls the drive motor 148 to set the agitator 20 in a rotating state, and also controls the pump 84 and the on-off valves 86 and 90 to set the heat medium supply state to a hot water supply state. Then, the workpiece W in the filtration preparation region M shown in FIG. 8(B) is heated by the hot water supplied to the first jacket 46 and the second jacket 48 and agitated by the agitating blades 146, and solids contained in the workpiece W are efficiently dissolved in the liquid.

[0095] The inclination angle of the container 12 in the filtration preparation holding step is not limited to 45 degrees and can be changed as appropriate. However, in order to prevent solids contained in the workpiece W from adhering to the filter section 18 in the subsequent crystallization step, the inclination angle needs to be determined so that a filtration preparation region M can be secured in an area vertically below the filter section 18. Furthermore, in order to prevent the workpiece W from adhering to the shaft through-hole 52, the inlet 54, the instrument mounting hole 56, the sight glass mounting holes 64a, 64b, and the hose connection holes 66a, 66b formed in the upper wall section 28, the inclination angle needs to be determined so that a clean region Q can be secured in the area where these are located. In other words, the inclination angle needs to be determined so that a clean region Q can be secured in the area where adhesion of the workpiece W is undesirable.

[0096] (Crystallization process) The crystallization process shown in Fig. 7 is a process for precipitating solid matter from the liquid matter of the workpiece W. When the crystallization process is performed, the filtration preparation holding process that started before the dissolving process is continued. The crystallization process is performed in the container 12 that is in a filtration preparation state.

[0097] As shown in Fig. 7, in the crystallization step, the control unit 24 (Fig. 4) controls the drive motor 148 to rotate the agitator 20, and controls the pump 84 and the on-off valves 86 and 90 to supply cold water as the heat medium. This cools the solution in the filtration preparation region M, causing solid matter to precipitate. That is, the control unit 24 in this embodiment executes "cooling crystallization," which crystallizes solid matter by cooling the workpiece W.

[0098] (filtration process) The filtration process shown in Fig. 7 is a process of filtering the workpiece W containing solid matter and liquid matter using the filter unit 18. In the filtration process, the liquid matter contained in the workpiece W is discharged from the liquid matter discharge nozzle 42, and the solid matter contained in the workpiece W is captured. When the filtration process is performed, the filtration retention process is started before the filtration process.

[0099] As shown in Fig. 9(C), in the filtration holding step, the control unit 24 (Fig. 4) controls the drive motor 164 of the container state changing unit 22 to switch the state of the container 12 from the filtration preparation state to the filtration state and hold the container 12 in the filtration state. The control unit 24 of this embodiment controls the drive motor 164 of the container state changing unit 22 to rotate the container 12, which is in the filtration preparation state shown in Fig. 8(B), 90 degrees clockwise from the state shown in the figure and stop it. Therefore, the container 12 is tilted to the side opposite to the filtration preparation state, and the tilt angle of the container 12 with respect to the horizontal plane is 45 degrees.

[0100] Here, the filtering state refers to a state of the container 12 in which the filter unit 18 is disposed vertically below the container 12 and a clean area Q is secured in an area vertically above the filter unit 18 in the accommodation space S. The filtering process is performed with the container 12 in the filtering state.

[0101] As shown in Fig. 7, in the filtering step, the control unit 24 (Fig. 4) controls the drive motor 148 to stop the agitator 20, and also controls the pump 84 and the on-off valves 86 and 90 to stop the supply of the heat medium. The control unit 24 also controls the on-off valve 72 to supply pressurizing gas from the gas source 74 to the storage space S through the hose connection holes 66a and 66b. The pressurizing gas then presses the material W against the filter medium 124 of the filter unit 18, and the liquid (filtrate) of the material W that passes through the filter medium 124 is discharged from the liquid discharge port 40 to the outside of the storage space S. The solid material W1 contained in the material W is also captured by the filter medium 124.

[0102] 9(C), the solid matter W1 captured by the filter medium 124 adheres to an adhesion surface 168 including the inner surfaces of the filter unit 18 and the container 12. Here, the inner surface of the filter unit 18 mainly refers to the surface of the filter medium 124 facing inward into the storage space S, and the inner surface of the container 12 refers to the inner surface of the wall portion 44. The adhesion surface 168 does not refer to a narrow range of surface to which the solid matter W1 actually adheres, but rather refers to a wide range of surface to which the solid matter W1 is expected to adhere.

[0103] To perform the second peeling step described below, at least one gas injection port 110 needs to be covered with solid matter W1. Therefore, in the filtration step, the solid matter W1 is captured by the filter medium 124, and the solid matter W1 is deposited on the inner surface of the wall portion 44 so as to cover at least one of the gas injection ports 110. Specifically, the control unit 24 controls the container state change unit 22 to hold the container 12 in a state in which the positions of the inner surfaces of the peripheral wall portion 26 and the lower wall portion 30 are lowered toward the liquid material discharge port 40. As a result, the gas injection ports 110 opening at or near the boundary portion E are covered with solid matter W1.

[0104] The inclination angle of the container 12 in the filtration and retention step is not limited to 45 degrees and can be changed as appropriate. However, in order to prevent the workpiece W from adhering to the shaft through-hole 52, the inlet 54, the meter mounting hole 56, the sight glass mounting holes 64a, 64b, and the hose connection holes 66a, 66b formed in the upper wall portion 28, the inclination angle must be determined so as to ensure a clean region Q in the area where these are located. In other words, the inclination angle must be determined so as to ensure a clean region Q in the area where it is undesirable for the workpiece W to adhere. The inclination angle may be set, for example, in the range of more than 0 degrees and less than 45 degrees, or in the range of 10 degrees to 30 degrees.

[0105] (peeling process) 7 includes a first peeling step in which solid matter W1 captured by the filter medium 124 and adhering to the attachment surface 168 is peeled from the attachment surface 168 in a stationary state, and a second peeling step in which solid matter W1 captured by the filter medium 124 and adhering to the attachment surface 168 is peeled from the attachment surface 168 by gas injected from the gas injection port 110. Here, "stationary state" means a state in which the solid matter W1 is left stationary without being stirred. When the peeling step is performed, the peeling and holding step is started before the peeling step.

[0106] As shown in FIG. 9(D), in the peeling and holding step, the control unit 24 (FIG. 4) controls the drive motor 164 of the container state change unit 22 to switch the state of the container 12 from the filtration state to the peeling state and hold the container 12 in the peeling state. In this embodiment, the control unit 24 controls the drive motor 164 of the container state change unit 22 to rotate the container 12, which is in the filtration state shown in FIG. 9(C), 90 degrees counterclockwise from the state shown in the figure and stop it. Therefore, the container 12 is tilted to the side opposite the filtration state, and the tilt angle of the container 12 with respect to the horizontal plane is 45 degrees. The tilt angle may be set, for example, in the range of more than 0 degrees to 45 degrees or less, or in the range of 10 degrees to 30 degrees.

[0107] Here, the peeled state refers to a state of the container 12 in which at least a portion of a drying region N for accommodating the solid matter W1 during the drying process is secured in a region vertically below the filter portion 18 in the storage space S, the lower wall portion 30 is disposed vertically below the filter portion 18, and a clean region Q is secured in a region vertically above the filter portion 18 in the storage space S. In this embodiment, at least a portion of the drying region N is secured in a region directly vertically below the filter portion 18 in the storage space S. The peeling process is performed with the container 12 in the peeled state.

[0108] As shown in Fig. 7, in the first peeling step, the control unit 24 (Fig. 4) controls the drive motor 148 to stop the agitator 20, and controls the pump 84 and the on-off valves 86 and 90 to supply hot water as the heat medium. The heat medium supplied to the first jacket 46 and the second jacket 48 shown in Fig. 9(D) heats the adhesion surface 168, and the contact area X on the surface of the solid object W1 that comes into contact with the adhesion surface 168 is heated and dried. In other words, the peeling step includes a step of heating and drying the contact area X on the surface of the solid object W1 that comes into contact with the adhesion surface 168.

[0109] When the contact area X dries, the liquid is removed from the contact area X, and the solid material W1 is peeled off from the attachment surface 168 and falls toward a region vertically below the attachment surface 168 or slides across the attachment surface 168. If a gap is created between the attachment surface 168 and the solid material W1 due to the drying of the contact area X, in the subsequent second peeling step, the gas injected from the gas injection port 110 enters the gap, allowing the solid material W1 to be peeled off efficiently.

[0110] In this embodiment, hot water is supplied to the first jacket 46 and the second jacket 48 provided outside the container 12, and the wall of the container 12 is heated from the outer surface side by the hot water, thereby heating the inner surface of the container 12. In other words, the first peeling step of this embodiment includes an "inner surface heating step" of heating the wall of the container 12 from the outer surface side of the container 12 to heat the inner surface of the container 12, which becomes the attachment surface 168. With regard to the filtration device 10, the first jacket 46 and the second jacket 48 are "inner surface heating devices" configured to heat the wall of the container 12 from the outer surface side of the container 12, thereby heating the inner surface of the container 12, which becomes the attachment surface 168.

[0111] After the first peeling step is completed, or in parallel with the first peeling step, the second peeling step is performed. As indicated by the dashed arrow in FIG. 9(D), the second peeling step is a step of peeling the solid matter W1 from the attachment surface 168, including the inner surface of the wall portion 44, by operating the peeling means 16 to inject gas from the gas injection ports 110 covered with at least the solid matter W1. In the second peeling step, the control unit 24 (FIG. 4) operates the on-off valve 122 to supply gas from the gas source 74 from the gas supply hoses 120a, 120b to the gas injection nozzles 50a, 50b. The gas supply method may be selected from a variety of methods, including a method of instantaneously supplying high-pressure gas, a method of intermittently supplying high-pressure gas, a method of continuously supplying high-pressure gas, and a method of sequentially supplying gas to the plurality of gas injection ports 110.

[0112] When gas is sprayed from gas injection ports 110, which are opened at or near the boundary E between the peripheral wall portion 26 (first portion) and the lower wall portion 30 (second portion) of the wall portion 44, onto the solid object W1 covering the gas injection ports 110, the pressure of the gas causes the solid object W1 to peel off from the attachment surface 168. At this time, the gas enters the gap between the attachment surface 168 and the solid object W1, facilitating the peeling of the solid object W1 and enabling efficient peeling.

[0113] (drying process) 7 is a process of heating and drying the solid matter W1 peeled off from the attachment surface 168, i.e., the inner surface of the wall portion 44, while stirring it. When the drying process is performed, a drying and maintaining process is started prior to the drying process.

[0114] 10(E), in the dry holding step, the control unit 24 (FIG. 4) controls the drive motor 164 of the container state changing unit 22 so as to switch the state of the container 12 from the peeled state to the dry state and to hold the container 12 in the dry state. In this embodiment, the control unit 24 controls the drive motor 164 of the container state changing unit 22 so as to rotate the container 12, which is in the peeled state shown in FIG. 9(D), 45 degrees clockwise from the state shown in the figure and stop it.

[0115] Here, the dry state refers to a state of the container 12 in which a dry region N for storing the solid material W1 is secured in a region vertically below the storage space S, a lower wall portion 30 is disposed vertically below the container 12, and a clean region Q is secured in a region vertically above the dry region N in the storage space S. The dry state in this embodiment corresponds to the loading state. In the dry state, the agitator blades 146 of the agitator 20 are disposed in the dry region N. The drying process is performed with the container 12 in a dry state.

[0116] 7, in the drying step, the control unit 24 (FIG. 4) controls the drive motor 148 to set the agitator 20 in a rotating state, and also controls the pump 84 and the on-off valves 86 and 90 to set the heat medium supply state to a hot water supply state. Then, the solid material W1 in the drying region N shown in FIG. 10(E) is heated by the hot water supplied to the first jacket 46 and the second jacket 48 and agitated by the agitator blades 146.

[0117] (discharge process) 7 is a process of discharging the solid matter W1 of the workpiece W, which has been captured in the filtering process and dried in the drying process, from the solid matter discharge nozzle 34. When the discharge process is performed, the discharge and holding process is started before the discharge process.

[0118] As shown in Fig. 10(F), in the discharge holding step, the control unit 24 (Fig. 4) controls the drive motor 164 of the container state changing unit 22 to switch the state of the container 12 from the dry state to the discharge state and hold the container 12 in the discharge state. In this embodiment, the control unit 24 controls the drive motor 164 of the container state changing unit 22 to rotate the container 12, which is in the dry state shown in Fig. 10(E), 45 degrees counterclockwise from the state shown in the figure and stop it. Therefore, the inclination angle of the container 12 with respect to the horizontal plane becomes 45 degrees.

[0119] Here, the discharge state refers to a state of the container 12 in which the solid discharge outlet 32 ​​is located vertically below the container 12 and a clean area Q is secured in an area vertically above the solid discharge outlet 32 ​​in the storage space S. The discharge process is performed with the container 12 in a dry state.

[0120] As shown in Figure 10(F), in the discharging step, the user removes the lid 36 (Figure 5(B)) from the tip of the solid discharge nozzle 34. As shown in Figure 7, in the discharging step, the control unit 24 (Figure 4) controls the drive motor 148 to put the agitator 20 into a rotating state, and controls the pump 84 and the on-off valves 86 and 90 to stop the supply of the heat medium.

[0121] (Effects of the embodiment) The filtering device 10 and filtering method of this embodiment can achieve the following effects due to the above configuration: The gas injected from the gas injection port 110 opened in the solid matter adhesion region F (FIG. 6(A)) directly hits the solid matter W1 without passing through the filter material 124, so that the filter material 124 can be prevented from expanding into the storage space S due to the pressure of the gas, and the solid matter W1 can be efficiently peeled off from the inner surface of the wall portion 44.

[0122] The gas injection port 110 of the peeling means 16 is opened on the inner surface of the wall portion 44, i.e., on the surface other than the filter medium 124, so the gas injected from the gas injection port 110 does not directly hit the filter medium 124. Therefore, the filter medium 124 is prevented from expanding into the storage space S due to the gas pressure, and the solid matter W1 can be efficiently peeled off from the inner surface of the wall portion 44.

[0123] As shown in Figure 7, the control unit 24 performs a peeling process before the drying process to peel off the solid matter W1 adhering to the inner surface of the wall portion 44 or the surface of the filter material 124, so that in the drying process, the entire solid matter W1 can be efficiently dried by the drying means (first jacket 46 and second jacket 48).

[0124] The gas injection port 110 of the peeling means 16 is opened at or near the boundary E between the peripheral wall portion 26 (first portion) and the lower wall portion 30 (second portion) of the wall portion 44, facing the storage space S, so that the gas injected from the gas injection port 110 can easily flow along the inner surface of at least one of the peripheral wall portion 26 (first portion) and the lower wall portion 30 (second portion). Therefore, the solid matter W1 adhering to the inner surfaces of the peripheral wall portion 26 (first portion) and the lower wall portion 30 (second portion) can be efficiently peeled off.

[0125] The solid matter W1 captured by the filter medium 124 provided in the liquid discharge passage V is deposited on the inner surface of the boundary E between the peripheral wall portion 26 (first portion) and the lower wall portion 30 (second portion) of the wall portion 44 or a portion nearby. Therefore, the solid matter W1 can be efficiently peeled off from the inner surfaces of the peripheral wall portion 26 (first portion) and the lower wall portion 30 (second portion) by the gas injected from the gas injection port 110 opened at the boundary E or a portion nearby.

[0126] 9(C), the positions of the inner surfaces of the peripheral wall portion 26 (first portion) and the lower wall portion 30 (second portion) become lower toward the liquid discharge port 40, and therefore, when the solid matter W1 captured and deposited by the filter medium 124 is cut along a vertical plane passing through the center line L of the peripheral wall portion 26, the cross-sectional shape becomes a triangle with two sides being in contact with the peripheral wall portion 26 and the lower wall portion 30. Therefore, the contact area where the solid matter W1 comes into contact with the inner surfaces of the peripheral wall portion 26 and the lower wall portion 30 becomes longer in the directions along the two sides, and the solid matter W1 can be efficiently peeled off from the inner surfaces of the peripheral wall portion 26 and the lower wall portion 30 by the gas injected from the gas injection port 110 and flowing along the two sides.

[0127] 6(B) can prevent foreign matter from entering the gas injection port 110. The porous body 104 has enough strength to not be deformed by the gas pressure, and therefore does not bulge inward into the storage space S due to the gas pressure.

[0128] In each processing step, a clean area Q is secured in an area where a portion to which the workpiece W should not be attached is located, so that the workpiece W can be prevented from adhering to that portion.

[0129] (Modification of filtration method) In carrying out the present invention, the filtration method is not limited to the above-described embodiment, and various modifications are possible without departing from the object of the present invention.

[0130] Fig. 11(A) is a diagram showing a first modified example of the peeling step. In the filtration method of the above embodiment, the drying step is performed after the peeling step shown in Fig. 7, but as shown in Fig. 11(A), the peeling step and the drying step may be performed partially in parallel. In other words, the drying step only needs to start after the start of the peeling step, and the end of the drying step may be later than the end of the peeling step or may be the same as the end of the peeling step.

[0131] For example, in the drying step, if solid matter W1 remains attached to the attachment surface 168, a first peeling step may be continued in which the solid matter W1 is peeled off from the attachment surface 168 in a stationary state. Also, a second peeling step may be continued in which the solid matter W1 is peeled off from the attachment surface 168 by jetting gas. The peeling step, which is performed in parallel with the drying step, may be performed in the container 12 in a dry state.

[0132] Fig. 11(B) is a diagram showing a second modified example of the peeling step. In the filtration method of the above embodiment, the peeling step shown in Fig. 7 is performed with the container 12 in the peeled state, but as shown in Fig. 11(B), the peeling step may also be performed with the container 12 in a state where the drying region N is not secured in the region vertically below the filter portion 18 (for example, the same state as the loading state). Even in this case, the solid matter W1 can be peeled off from the adhesion surface 168 by the first peeling step and the second peeling step.

[0133] In the filtration method of the above embodiment, the peeling process includes a first peeling process in which the solid matter W1 is peeled off from the attachment surface 168 in a stationary state, and a second peeling process in which the solid matter W1 is peeled off from the attachment surface 168 by gas injected from the gas injection port 110, but the first peeling process may be omitted.

[0134] (Modification of filtration device) In carrying out the present invention, the filtration device 10 is not limited to the above embodiment, and various modifications are possible without departing from the object of the present invention.

[0135] Fig. 12(A) is a cross-sectional view showing the configuration of a filtration device 170 according to another embodiment, and Fig. 12(B) is a partially enlarged cross-sectional view showing the discharging process. In the filtration device 10 of the above embodiment, the solid discharge nozzle 34 serving as the "solid discharge section" constituting the solid discharge path U and the liquid discharge nozzle 42 serving as the "liquid discharge section" constituting the liquid discharge path V are provided independently of each other, but the liquid discharge nozzle 42 may serve as both the "liquid discharge section" and the "solid discharge section."

[0136] In the filtration device 170 shown in Figure 12(A), the solid discharge nozzle 34 is omitted, and the liquid discharge nozzle 42 serves as both the "liquid discharge section" and the "solid discharge section." In other words, when the liquid discharge nozzle 42 is used as the "liquid discharge section," the filter medium 124 and support 126 of the filter section 18 are inserted into the liquid discharge nozzle 42, and the lid section 140 of the filter section 18 is fixed to the flange 42a of the liquid discharge nozzle 42 via a clamp 142. When the liquid discharge nozzle 42 is used as the "solid discharge section," the clamp 142 is removed, and the filter medium 124 and support 126 are pulled out from the inside of the liquid discharge nozzle 42.

[0137] As shown in Figure 12(B), when the filter section 18 is removed from the liquid discharge nozzle 42, the liquid discharge nozzle 42 becomes the "solid discharge section," and the internal space of the liquid discharge nozzle 42 becomes the solid discharge path U. In the filtration device 170, the liquid discharge nozzle 42 serves as both the "liquid discharge section" and the "solid discharge section," so the filtration state and the discharge state coincide with each other.

[0138] Fig. 13(A) is a cross-sectional view showing the configuration of a filtration device 172 according to yet another embodiment, and Fig. 13(B) is a partially enlarged cross-sectional view showing the discharging process. In the filtration device 170 shown in Fig. 12(A), the filter medium 124 is attached to and detached from the liquid discharge nozzle 42 by hand, but the work of attaching and detaching the filter medium 124 may also be performed by mechanical operation. For example, as in the filtration device 172 shown in Fig. 13(A), the filter medium 174 may be attached and detached using a hydraulic cylinder device 176.

[0139] 13(A) has a cylinder 178 and a piston rod 180, with a bellows 182 provided around the piston rod 180. A truncated cone-shaped filter support part 184 is provided at the tip of the piston rod 180, and the filter material 174 is attached to the tip surface of the filter support part 184. In addition, the piston rod 180 and the filter support part 184 are provided with a filtrate flow path J for discharging the liquid (filtrate) separated from the solid matter. Although not shown, the liquid (filtrate) flowing through the filtrate flow path J is discharged into a drain tank via a drain pipe.

[0140] A discharge port 186 is formed in the lower part of the peripheral wall 26 of the container 12, and a cylindrical seat 188 made of a metal such as stainless steel is provided at the discharge port 186 so as to protrude outward. The inner peripheral surface 188a of the seat 188 is tapered so that the filter medium support part 184 can abut against it without any gaps, and the space inside the seat 188 forms the liquid discharge path V or the solid discharge path U. A receiving member 190 is provided below the seat 188 to guide the solids discharged from the solid discharge path U downward.

[0141] In the filtering process, the filter medium 174 is positioned in the liquid discharge path V by the hydraulic cylinder device 176, and solid matter in the workpiece W is captured by the filter medium 174. As shown in FIG. 13(B), in the discharging process, the filter medium 174 is removed from the liquid discharge path V by the hydraulic cylinder device 176, and the liquid discharge section is switched to a solid discharge section. Then, the solid matter W1 captured by the filter medium 174 is discharged from the solid discharge path U toward the receiving member 190. In the filtering device 172, the seat portion 188 serves as both the "liquid discharge section" and the "solid discharge section," so the filtering state and the discharge state are the same.

[0142] The filtrate flow path J formed inside the piston rod 180 may be used solely for the flow of liquid matter, but it may also be used to flow not only liquid matter but also gas sprayed onto the filter medium 174 in the opposite direction to the liquid matter. When gas is flowed through the filtrate flow path J, the gas pressure can blow solid matter W1 and foreign matter adhering to the filter medium 174 into the storage space S. The type of filter medium 174 is not particularly limited, and filter cloth (woven fabric, nonwoven fabric), sintered wire mesh, and the like can be appropriately selected and used. Using a porous material such as sintered wire mesh that is strong enough to withstand gas pressure can prevent the filter medium 174 from expanding into the storage space S due to the gas pressure.

[0143] In the embodiment of the filtration device 10 shown in Figure 5(B), the container 12 is formed in a cylindrical shape with a bottom, but the shape of the container 12 is not limited to a cylindrical shape with a bottom, and may be formed in a spherical shape, an ellipsoid shape, a rectangular parallelepiped shape, an irregular shape, etc.

[0144] 5(B), the solid discharge outlet 32 ​​and the liquid discharge outlet 40 are formed to face in opposite directions, but they may be formed to face in the same direction or to face in directions that intersect with each other in a plan view. In the latter case, in the container state changing unit 22, two rotation centers for rotating the container 12 may be arranged to intersect with each other in a plan view.

[0145] In the embodiment of the filtration device 10 shown in FIG. 5(B), the first jacket 46 and the second jacket 48 are used as a "heating device for peeling" and a "heating device for drying." However, these heating devices are not limited to jackets, and may be, for example, electric heaters, electromagnetic induction heating devices, microwave heating devices, etc. Also, two or more of these may be used in combination, or at least one of these may be used in combination with a jacket. Furthermore, in the drying step, high-temperature gas may be supplied into the container to dry the solid material W1.

[0146] In the embodiment of the filtration device 10 shown in Figure 5 (B), the liquid discharge outlet 40 is provided in the peripheral wall portion 26 (first portion), but the liquid discharge outlet 40 may also be provided in the lower wall portion 30 (second portion), or may be provided at the boundary portion E between the peripheral wall portion 26 (first portion) and the lower wall portion 30 (second portion) in the wall portion 44.

[0147] In the embodiment of the filtration device 10 shown in Figure 6(A), two gas injection ports 110 are opened in the vicinity of the boundary E in the lower wall portion 30 (second portion), but at least one gas injection port 110 may be opened in the vicinity of the boundary E in the peripheral wall portion 26 (first portion), or may be opened at the boundary E.

[0148] 6(A) and 6(B), the peeling means 16 includes gas injection nozzles 50a and 50b having a cylindrical nozzle body 102, but the cylindrical nozzle body 102 is not necessarily required, and the peeling means 16 may be changed to another configuration having a gas injection port 110. The number of gas injection nozzles may be one, or may be three or more. In other words, the peeling means 16 only needs to have at least one gas injection port 110.

[0149] Fig. 14(A) is a cross-sectional plan view showing the configuration of a peeling means 192 according to a first modified example. The peeling means 192 shown in Fig. 14(A) has six gas jetting ports 110 opening in the solid material adhesion region F. Four of the gas jetting ports 110 open in a portion of the lower wall portion 30 (second portion) near the boundary E, facing the storage space S. The remaining two gas jetting ports 110 open opposite each other in a portion of the peripheral wall portion 26 (first portion) near the boundary E, facing the storage space S.

[0150] According to the first modified peeling means 192, the gas flows injected from the six gas injection ports 110 can be made to intersect, thereby enabling the gas to spread over a wider area and increasing the peeling efficiency of the solid material W1.

[0151] In the peeling means 16 shown in Fig. 5(B) and the peeling means 192 shown in Fig. 14(A), the operation of starting and stopping the gas ejected from each of the multiple gas ejection ports 110 may be performed individually using an on-off valve provided in the gas flow path corresponding to each gas ejection port 110. The control unit 24 may identify the gas ejection port 110 to which the solid matter W1 is attached by analyzing an image sent from a camera that photographs each gas ejection port 110, and control the on-off valve to eject gas from that gas ejection port 110. Methods for identifying the gas ejection port 110 to which the solid matter W1 is attached may include a method of identification by image analysis, a method of identification using a contact sensor, an ultrasonic level sensor, or a visual method.

[0152] Fig. 14(B) is a cross-sectional view showing the configuration of a peeling means 194 according to a second modification. The peeling means 194 shown in Fig. 14(B) has one gas jetting port 110 opening in the solid material adhesion region F in the lower wall portion 30 (second portion), one gas jetting port 110 opening in a region outside the solid material adhesion region F in the peripheral wall portion 26 (first portion), and one gas jetting port 110 opening in a region outside the solid material adhesion region F in the upper wall portion 28.

[0153] According to the peeling means 194 of the second modification, although the two gas jetting ports 110 are not open in the solid matter adhesion region F, gas can also be jetted onto the solid matter W1 from these gas jetting ports 110, and peeling efficiency can be improved by appropriately determining the gas jetting direction. For example, as shown in Fig. 14(B), the solid matter W1 can be effectively peeled off by jetting gas aimed at the gap between the inner surface of the wall portion 44 and the solid matter W1.

[0154] In the peeling means 194 of the second modified example, the operation of starting and stopping the gas ejected from each of the plurality of gas ejection ports 110 may be performed individually using an on-off valve provided in the gas flow path corresponding to each gas ejection port 110. 。 [Explanation of symbols]

[0155] E...boundary portion, F...area where solid matter is to be attached, L...center line, M...filtration preparation area, N...drying area, Q...clean area, R...gas flow path, S...storage space, T...imaginary circle, U...solid matter discharge path, V...liquid matter discharge path, W...object to be treated, W1...solid matter, X...contact area, 10...filtration device, 12...container, 16...peeling means, 18...filter section, 20...agitator, 22...container state change section, 24...control section, 26...peripheral wall section, 28...upper wall section, 30...lower wall section, 32...solid matter discharge port, 34...solid matter discharge nozzle, 34a...flange, 36...lid section, 36a...lid plate section, 36b...core, 38...clamp, 40...liquid discharge port, 42...liquid discharge nozzle, 42a...flange, 42b...projection, 44...wall, 46...first jacket, 46a...jacket body, 48...second jacket, 48b...jacket body, 50a, 50b...gas injection nozzle, 52...shaft through hole, 54...inlet, 56...meter mounting hole, 58...nozzle, 60...lid, 62...meter, 64a, 64b...sight window mounting hole, 66a, 66b...hose connection hole, 68a, 68b...sight window, 70a, 70b...gas supply hose, 72...on / off valve, 74...gas source, 76, 78...heat medium flow path, 80a...heat medium inlet, 80b... Heat medium outlet, 82a...heat medium supply pipe, 82b...heat medium discharge pipe, 84...pump, 84a...discharge port, 84b...suction port, 86...on / off valve, 88...hot water source, 90...on / off valve, 92...cold water source, 98a...heat medium inlet, 98b...heat medium outlet, 100a...heat medium supply pipe, 100b...heat medium discharge pipe, 102...nozzle body, 102a...recess, 102b...groove, 102c...female thread, 102d...flange, 104...porous body, 106...sheath tube, 106a...male thread, 108...nut, 108a...female thread, 108b...abutment portion, 110...gas injection port, 112...gas supply port, 114, 116...O-ri ring, 118...through hole, 120a, 120b...gas supply hose, 122...opening / closing valve, 124...filter material, 126...support, 128...filter plate portion, 128a...through hole, 130...clamping portion, 132...groove, 134...O-ring, 138...PTFE spacer, 136...recess, 140...lid portion, 140a...exhaust pipe connection hole, 140b...handle, 142...clamp, 144...drive shaft, 146...mixing blade, 148...drive motor, 150a, 150b...frame, 152a, 152b...bearing portion, 154a, 154b...rotating shaft, 156...rotating operation portion, 158a, 158b...base, 160a,160b...support, 162...gear unit, 164...drive motor, 166...manual handle, 168...adhesion surface, 170, 172...filtration device, 174...filter material, 176...hydraulic cylinder device, 178...cylinder, 180...piston rod, 182...bellows, 184...filter material support portion, 186...discharge port, 188...seat portion, 188a...inner peripheral surface, 190...receiving member, 192, 194...peeling means.

Claims

1. a container having a wall portion that forms a storage space for storing a material to be processed, the material including a solid material and a liquid material; a filter section provided in the container and having a filter material that captures the solid matter and allows the liquid matter to pass through; a liquid discharge port provided in the wall portion for discharging the liquid passing through the filter medium to the outside of the storage space; a peeling means for peeling off the solid matter captured by the filter material and adhering to the inner surface of the wall portion, the removing means has a gas injection port that injects gas onto the solid matter adhering to the inner surface of the wall portion, A filtration device in which at least one of the gas injection ports is opened in a solid adhesion area on the inner surface of the wall portion where the solids captured by the filter material are expected to come into contact and adhere when they accumulate.

2. A drying means for drying the solid material peeled by the peeling means; 2. The filtering device according to claim 1, further comprising: a control unit that controls the peeling means and the drying means so as to perform a peeling step of peeling the solid matter with the peeling means and a drying step of drying the solid matter with the drying means in this order.

3. The wall portion has a first portion and a second portion provided adjacent to the first portion so as to form a certain angle with respect to the first portion, the liquid discharge port is provided in the first portion or the second portion, 2. The filtration device according to claim 1, wherein at least one of the gas injection ports opened in the region intended for solid matter adhesion faces the storage space at a boundary between the first portion and the second portion of the wall portion, or at a portion where the shortest distance from the boundary to the inner periphery of the gas injection port is within 20 cm.

4. At least one of the gas injection port and the liquid discharge port, which are opened in the area where the solid matter is to be attached, are provided at the bottom of the container, The filtering device according to claim 3 , wherein the filter medium is provided in a liquid discharge path including the liquid discharge port.

5. a container state changing unit for holding the container and changing the state of the container; a control unit that controls the container state change unit, the container has a cylindrical peripheral wall portion constituting the first portion and a lower wall portion constituting the second portion by closing a lower opening of the peripheral wall portion, The liquid discharge port is provided in a lower portion of the peripheral wall portion, The filtering device according to claim 4, wherein the control unit controls the container state change unit to hold the container in a state in which the positions of the inner surfaces of the peripheral wall portion and the lower wall portion are lowered toward the liquid material discharge outlet during a filtering process for filtering the object to be processed.

6. 6. The filtering device according to claim 3, wherein the gas injection port is covered with a porous body having a strength sufficient to prevent deformation due to the pressure of the gas and having a large number of ventilation holes sized to prevent the solid matter from passing through.

7. a container having a wall portion that forms a storage space for storing a material to be processed, the material including a solid material and a liquid material; a filter section provided in the container and having a filter material that captures the solid matter and allows the liquid matter to pass through; a liquid discharge port provided in the wall portion for discharging the liquid passing through the filter medium to the outside of the storage space; a peeling means having at least one gas injection port opened on the inner surface of the wall portion, a filtering step of capturing the solid matter with the filter material, thereby depositing the solid matter on the inner surface of the wall portion so as to cover at least one of the gas injection ports, and discharging the liquid matter that has passed through the filter material from the liquid outlet; a stripping step of stripping the solid matter from the inner surface of the wall portion by operating the stripping means to inject the gas from the gas injection port covered with at least the solid matter.

8. The wall portion has a first portion and a second portion provided adjacent to the first portion so as to form a certain angle with respect to the first portion, the liquid discharge port is provided in the first portion or the second portion, At least one of the gas injection ports covered with the solid material is opened to face the accommodation space at a boundary between the first portion and the second portion of the wall portion, or at a portion where the shortest distance from the boundary to an inner peripheral edge of the gas injection port is within 20 cm, The filtering method according to claim 7 , wherein in the filtering step, the solid matter is deposited on the inner surface of the wall portion so as to cover at least one of the gas injection ports.

9. a container state change unit for holding the container and changing the state of the container; at least one of the gas injection port and the liquid discharge port covered with the solid material is provided in a lower portion of the container; The filter medium is provided in a liquid discharge path including the liquid discharge port, The filtering method according to claim 8, wherein in the filtering step, the container state change unit is operated to hold the container in a state in which the positions of the inner surfaces of the first part and the second part are lowered toward the liquid discharge outlet.

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