Causticizing slag filter-pressing separation device

Abstract

The utility model relates to the technical field of aluminum oxide production, in particular to a causticized slag filter-pressing separation device which comprises a filter press body and filter plates, the filter plates are linearly arranged along a guide rail, a feeding hole is formed in the center of each filter plate, and mixed liquid enters from the feeding hole. The first filter chamber and the second filter chamber are respectively arranged on two sides of the filter plate, solid-liquid separation can be carried out simultaneously, and compared with traditional single-side filtration, the filter area is greatly increased, the filter-pressing separation efficiency is improved, and more causticizing slag mixed liquid can be treated in a short time. The device adopts the latticed first drainage net and the latticed second drainage net, and overflow holes are formed in nodes, so that permeating liquid is smoothly collected and discharged, local water accumulation is avoided, the filtering stability and continuity are guaranteed, and the filter pressing quality is improved. In addition, the overflow holes are respectively formed in the surfaces of the corresponding chambers, and the chambers are all provided with the filter cloth, so that the pressure of the filter cloth can be dispersed, the damage possibility is reduced, the service life is prolonged, the operation stability and reliability of the device are enhanced, and the filter pressing quality reduction risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of alumina production technology, and more specifically, to a caustic slag pressure filtration and separation device. Background Technology

[0002] In the alumina production process, a washing solution is needed to clean the causticizing slag. After the causticizing slag and the washing solution are mixed, they react or dissolve under certain conditions, causing impurities to transfer to the primary washing solution. Then, the solid and liquid are separated by methods such as filtration and sedimentation, thus achieving the washing of the causticizing slag. Because the causticizing slag has a high calcium carbonate content, a large amount of washing solution is consumed, thereby increasing production costs.

[0003] In washing systems, causticized residue can be separated into solids and liquids through filter press filtration, thereby reducing the amount of washing liquid used. A plate and frame filter press consists of alternating filter plates and frames forming a set of filter chambers. The surface of the filter plates has grooves, and the filter cloth is supported by protrusions on the filter plates, thus achieving solid-liquid separation through the filter cloth. However, existing filter presses use this method of supporting the filter cloth with protrusions, which makes the filter cloth prone to damage. Some solid residue can easily enter the flow channel directly through the damaged areas of the filter cloth, thus reducing the filtration quality. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a caustic slag pressure filter separation device, which reduces the frequency of filter cloth replacement and improves the quality of pressure filtration.

[0005] A caustic slag pressure filtration separation device according to an embodiment of the present invention includes:

[0006] A filter press body is provided; filter plates are provided on the filter press body; at least two filter plates are provided, and all the filter plates are linearly arranged on the guide rail along the length direction of the guide rail; a feed hole is provided at the center of the filter plate; a first drain hole and a second drain hole are respectively provided at the four corners of the filter plate; a first filtration chamber is provided on one side of the filter plate, and a mesh-like first drain net is provided inside the filter plate, and a first overflow hole is provided at the node of the mesh-like first drain net; the first drain hole is connected to the first filtration chamber through the first drain net and the first overflow hole; a second filtration chamber is provided on the other side of the filter plate, and a mesh-like second drain net is provided inside the filter plate, and a second overflow hole is provided at the node of the mesh-like second drain net; the second drain hole is connected to the second filtration chamber through the second drain net and the second overflow hole; filter cloth is provided on both the first filtration chamber and the second filtration chamber.

[0007] According to some embodiments of the present application, the first drainage net and the second drainage net are both composed of through holes perpendicular to each other.

[0008] According to some embodiments of the present application, plugs are arranged on the through holes respectively.

[0009] According to some embodiments of the present application, a positioning column is arranged on one side of the filter plate; and a positioning groove is arranged on the other side of the filter plate.

[0010] According to some embodiments of the present application, a guide chute is arranged on the edge of the positioning groove.

[0011] According to some embodiments of the present application, guide wheels are arranged on both sides of the filter plate respectively; and the guide wheels are in rolling connection with the guide rail.

[0012] According to some embodiments of the present application, the guide rail is made of L-shaped channel steel.

[0013] According to some embodiments of the present application, the filter cloth is provided with a clearance hole corresponding to the feed hole.

[0014] According to some embodiments of the present application, the filter press body is provided with a base frame, a linear drive, a compression plate and a thrust plate; the guide rail is arranged on the base frame, the thrust plate is fixedly connected to one end of the guide rail and the base frame; the linear drive is fixedly connected to the other end of the guide rail and the base frame, the output end of the linear drive is in transmission connection with the base frame and the compression plate; and the compression plate is in sliding connection with the guide rail.

[0015] According to some embodiments of the present application, the thrust plate is provided with a first pipe, a second pipe and a third pipe; the first pipe is in communication with the first drainage hole; the second pipe is in communication with the second drainage hole; and the third pipe is in communication with the feed hole.

[0016] According to some embodiments of the present application, the causticizing residue pressure filtration separation device has at least the following beneficial effects:

[0017] According to the scheme of the present application, the causticizing residue pressure filtration separation device comprises a filter press body, and the filter press body is provided with filter plates; the filter plates are at least two, and all the filter plates are linearly arranged on the guide rail along the length direction of the guide rail; the filter plate is provided with a feed hole at the central position; the mixed liquid passes through the feed hole at the central position of the filter plate; the two sides of the filter plate are respectively provided with a first filter chamber and a second filter chamber, and the solid-liquid separation operation is simultaneously performed; compared with the traditional single-side filtration mode, the filtration area is greatly increased, the pressure filtration separation efficiency is improved, and more causticizing residue mixed liquid can be treated in a shorter time.

[0018] According to the scheme of the utility model, the first drainage net and the second drainage net are grid-shaped, and overflow holes are arranged at nodes, and the structure design can make the liquid passing through the filter cloth more smoothly gather and discharge.

[0019] According to the scheme of the utility model, the first overflow hole or the second overflow hole is arranged on the surface of the first filter chamber or the second filter chamber of the filter plate respectively, and the filter cloth is arranged on the first filter chamber and the second filter chamber. Through the design of the structure, the filter cloth can be laid on the surface of the filter plate, which disperses the pressure on the filter cloth to a certain extent, reduces the possibility of damage of the filter cloth due to excessive local pressure, prolongs the service life of the filter cloth, and further improves the operation stability and reliability of the whole filter press device, and reduces the problem of the decrease of the filter press quality caused by the damage of the filter cloth. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of the utility model;

[0021] Figure 2 It is a sectional view structural schematic view of the utility model;

[0022] Figure 3 It is an explosion structural schematic view of the filter plate of the utility model;

[0023] Figure 4 It is a perspective structural schematic view of the unilateral drainage net of the utility model;

[0024] Figure 5 It is a perspective structural schematic view of the filter plate of the utility model.

[0025] In the drawing:

[0026] 100 - base frame, 110 - linear drive, 120 - compression plate, 130 - thrust plate, 140 - guide rail, 150 - first pipeline, 160 - second pipeline, 170 - third pipeline;

[0027] 200 - filter plate, 201 - first filter chamber, 202 - second filter chamber, 203 - guide wheel, 210 - feed hole, 220 - first drainage hole, 230 - second drainage hole, 240 - first drainage net, 241 - first overflow hole, 250 - second drainage net, 251 - second overflow hole, 260 - filter cloth, 261 - clearance hole, 270 - plug, 280 - positioning column, 290 - positioning groove, 291 - guide inclined groove. DETAILED DESCRIPTION

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0031] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0032] Reference Figures 1 to 5As shown, this utility model discloses a caustic slag pressure filtration and separation device, including a filter press body; a filter plate 200 is provided on the filter press body; at least two filter plates 200 are provided, and all the filter plates 200 are linearly arranged on the guide rail 140 along the length direction of the guide rail 140; a feed hole 210 is provided at the center of the filter plate 200; a first drain hole 220 and a second drain hole 230 are respectively provided at the four corners of the filter plate 200; a first filtration chamber 201 is provided on one side of the filter plate 200, and a mesh-like first drain net 240 is provided inside the filter plate 200. A first overflow hole 241 is provided at the node of 40; a first drain hole 220 is connected to the first filter chamber 201 through the first drain net 240 and the first overflow hole 241; a second filter chamber 202 is provided on the other side of the filter plate 200, and a mesh-like second drain net 250 is provided inside the filter plate 200. A second overflow hole 251 is provided at the node of the mesh-like second drain net 250 on the filter plate 200; a second drain hole 230 is connected to the second filter chamber 202 through the second drain net 250 and the second overflow hole 251; filter cloth 260 is provided on both the first filter chamber 201 and the second filter chamber 202. In this embodiment, multiple filter plates 200 are arranged on guide rail 140. A first filter chamber 201 and a second filter chamber 202 are respectively provided on both sides of each filter plate 200. When adjacent filter plates 200 are closed, the first filter chamber 201 and the second filter chamber 202 can form a relatively sealed filter chamber. When adjacent filter plates 200 are closed, the feed holes 210 on the filter plates 200 can form feed channels and communicate axially with each filter chamber. After the mixed liquid enters the filter chamber, under pressure, the mixed liquid permeates through the filter cloth 260 into the interior of the filter plate 200 to form a clarified liquid. When adjacent filter plates 200 are closed, all the first drain holes 220 can form a first drain channel, and all the second drain holes 230 can form a second drain channel. During the overflow stage, on the one hand, part of the clarified liquid sequentially enters the first drain hole 220 through the first overflow hole 241 and the first drain net 240. On the other hand... A portion of the clarified liquid sequentially enters the second drain hole 230 through the second overflow hole 251 and the second drain net 250, forming a double drainage structure. During the backwashing stage, the feed inlet stops supplying material, and the cleaning liquid can rinse the filter cloth 260 through the first drain hole 220, the first drain net 240, and the first overflow hole 241; and / or, the cleaning liquid can rinse the filter cloth 260 through the second drain hole 230, the second drain net 250, and the second overflow hole 251. In this embodiment, the first filter chamber 201 and the second filter chamber 202 are respectively provided on both sides of the filter plate 200, and solid-liquid separation is performed simultaneously. Compared with the traditional single-sided filtration method, the filtration area is greatly increased, the efficiency of pressure filtration is improved, and more caustic slag mixture can be processed in a shorter time.The design employs a mesh-like first drainage net 240 and second drainage net 250, with overflow holes at the nodes. This structure allows the liquid passing through the filter cloth 260 to collect and drain more smoothly. The uniform distribution of the mesh drainage net avoids local water accumulation, ensuring the stability and continuity of the entire filtration process and contributing to improved filtration quality. The first overflow hole 241 or the second overflow hole 251 is respectively located on the surface of the first filter chamber 201 or the second filter chamber 202 of the filter plate 200. Filter cloth 260 is installed on both the first filter chamber 201 and the second filter chamber 202. Through this structural design, the filter cloth 260 can be laid on the surface of the filter plate 200, dispersing the pressure on the filter cloth 260 to a certain extent, reducing the possibility of damage due to excessive local pressure, extending the service life of the filter cloth 260, thereby improving the overall operational stability and reliability of the filtration device and reducing the problem of decreased filtration quality caused by filter cloth 260 damage.

[0033] In some embodiments of this utility model, both the first drainage net 240 and the second drainage net 250 are composed of mutually perpendicular through holes. In this embodiment, by processing through holes on the periphery of the filter plate 200, the first drainage net 240 and the second drainage net 250 can be formed into a mesh. At the same time, the first drainage net 240 and the second drainage net 250 are staggered along the parting surface of the filter plate 200. Through the design of this structure, not only is the processing of the filter plate 200 convenient, but the structural strength of the filter plate 200 can also be guaranteed.

[0034] In some embodiments of this utility model, plugs 270 are respectively provided on the through holes. Specifically, in this embodiment, during normal filtration, the plugs 270 are in a closed state. In this embodiment, the plugs 270 can be grommets and are threadedly connected to the through holes via the grommets. After the mixed liquid enters the filter chamber, the clarified liquid formed by passing through the filter cloth 260 enters the first drainage net 240 composed of mutually perpendicular through holes through the first overflow hole 241, and then flows to the first drainage hole 220 for discharge; similarly, the clarified liquid on the other side enters the second drainage net 250 through the second overflow hole 251 and is discharged from the second drainage hole 230. At this time, the plugs 270 prevent external impurities or abnormal fluids from entering the interior of the drainage net and interfering with the normal drainage process, ensuring the stable operation of the drainage system and guaranteeing the smooth progress of solid-liquid separation. The plugs 270 can prevent external debris, dust, etc. from entering the through holes of the drainage net. The plugs 270 provide convenience for the maintenance of the drainage net. When the equipment undergoes routine maintenance or experiences drainage abnormalities, there is no need for extensive disassembly of the entire filter plate 200 structure. Simply opening the plug 270 allows for inspection, cleaning, and repair of the drainage network's interior. This convenient maintenance method saves significant time and labor costs, improves equipment maintainability, and ensures long-term stable operation.

[0035] In some embodiments of this utility model, a positioning post 280 is provided on one side of the filter plate 200; a positioning groove 290 is provided on the other side of the filter plate 200. Specifically, in this embodiment, the cooperation of the positioning post 280 and the positioning groove 290 enables high-precision positioning between the filter plates 200. In filter press equipment, accurate splicing of the filter plates 200 is crucial, as any slight deviation may affect the feeding, filtration, and drainage effects. Through the cooperation of the positioning post 280 and the positioning groove 290, the splicing error of the filter plates 200 can be controlled within a very small range, ensuring accurate alignment of key structures on each filter plate 200, and guaranteeing the normal operation and efficient filtration of the equipment.

[0036] In some embodiments of this utility model, a guide groove 291 is provided on the edge of the positioning groove 290. Specifically, in this embodiment, the guide groove 291 plays a guiding and positioning role. When one filter plate 200 approaches the positioning groove 290 of another filter plate 200, the guide groove 291 first contacts the positioning component. The guide groove 291 has an inclined surface, which can generate a guiding force on the positioning component, causing it to gradually slide into the accurate position of the positioning groove 290 along the direction of the groove. As the positioning component moves under the guidance of the guide groove 291, it will automatically align with the center position of the positioning groove 290 and finally fall accurately into the positioning groove 290, completing the positioning connection of the two filter plates 200. This guiding process is gradual and automatic, requiring no overly precise manual adjustments by the operator, greatly improving the convenience and accuracy of positioning.

[0037] In some embodiments of this utility model, guide wheels 203 are respectively provided on both sides of the filter plate 200; the guide wheels 203 and the guide rail 140 are in a rolling connection. Specifically, in this embodiment, during the operation of this device, the filter plate 200 needs to move along the guide rail 140 to achieve switching between different working stages such as feeding, filtering, and discharging. The guide wheels 203 provided on both sides of the filter plate 200 form a rolling connection structure with the guide rail 140. When the filter plate 200 needs to move, the power device, such as a hydraulic system, electric push rod, etc., applies a driving force, and the filter plate 200 begins to move under the action of the driving force. At this time, the guide wheels 203 roll on the guide rail 140, converting the sliding friction between the filter plate 200 and the guide rail 140 into rolling friction. The rolling friction coefficient is much smaller than the sliding friction coefficient, making the movement of the filter plate 200 smoother and reducing energy loss. The circumferential surface of the guide wheel 203 is in close contact with the guide rail 140 and can rotate freely around its own axis. During the movement of the filter plate 200, the guide wheel 203 always maintains good contact with the guide rail 140, guiding the filter plate 200 to move smoothly along the direction of the guide rail 140, ensuring that the filter plate 200 can move accurately along the predetermined path throughout the entire stroke without any deviation or jamming.

[0038] In some embodiments of this utility model, the guide rail 140 is made of L-shaped channel steel. Specifically, in this embodiment, L-shaped channel steel is widely used, has a mature manufacturing process, and its price is relatively reasonable. Using L-shaped channel steel as the material for the guide rail 140 effectively reduces the manufacturing cost of the equipment while meeting its performance requirements. At the same time, its good durability also reduces the cost of later maintenance and replacement of the guide rail 140, improving the overall cost-effectiveness of the equipment.

[0039] In some embodiments of this utility model, the filter cloth 260 is provided with a clearance hole 261 corresponding to the feed hole 210. Specifically, in this embodiment, the clearance hole 261 eliminates the obstruction of the filter cloth 260 to the feed, allowing the mixture to enter the filtration area without obstruction. This avoids clogging that may occur during the feeding process, ensures the continuity and stability of the feed, and helps to improve the pressure filtration efficiency. During the installation of the filter cloth 260, the clearance hole 261 can serve as a positioning reference, helping operators to quickly and accurately install the filter cloth 260 on the filter plate 200, ensuring that the key parts of the filter cloth 260 are accurately aligned with the feed hole 210 and other structures on the filter plate 200. When the filter cloth 260 needs to be replaced, the new filter cloth 260 can also be quickly installed using the clearance hole 261, improving the efficiency of filter cloth 260 installation and replacement and reducing equipment downtime.

[0040] In some embodiments of this utility model, the filter press body includes a base frame 100, a linear drive 110, a pressing plate 120, and a thrust plate 130. A guide rail 140 is mounted on the base frame 100, and the thrust plate 130 is fixedly connected to the base frame 100 at one end of the guide rail 140. The linear drive 110 is fixedly connected to the base frame 100 at the other end of the guide rail 140, and the output end of the linear drive 110 passes through the base frame 100 and is connected to the pressing plate 120 via a transmission connection. The pressing plate 120 and the guide rail 140 are slidably connected. Specifically, in this embodiment, the base frame 100 serves as the basic support structure of the filter press body, providing a platform for the installation and fixation of other components. The guide rail 140, mounted on the base frame 100, ensures its stability and straightness, providing a precise track for the movement of the filter plate 200 and related components. The thrust plate 130 is fixed to one end of the guide rail 140, serving a positioning and support function. It withstands the reaction force from components such as the filter plate 200 during the filtration process, preventing overall equipment displacement. The linear drive 110 is fixed to the other end of the guide rail 140, with its output end passing through the base frame 100 and connected to the pressure plate 120. The linear drive 110 typically takes the form of a hydraulic cylinder or an electric push rod. When the equipment starts, the linear drive 110 operates, pushing the pressure plate 120 to move linearly along the guide rail 140 through the extension and retraction of its output end. For example, when a hydraulic cylinder is used as the linear drive 110, injecting or discharging hydraulic oil into the cylinder pushes the piston and piston rod, thereby moving the pressure plate 120. The pressure plate 120 is slidably connected to the guide rail 140, allowing it to move smoothly back and forth along the guide rail 140 under the action of the linear drive 110. Before the filtration process begins, the linear drive 110 pushes the clamping plate 120 towards the thrust plate 130, gradually pressing the filter plates 200 between them to form a sealed filtration space. After filtration is completed, the linear drive 110 reverses its direction, pulling the clamping plate 120 away from the thrust plate 130, thus loosening the filter plates 200 for easy unloading and subsequent operations.

[0041] In some embodiments of this utility model, the thrust plate 130 is provided with a first pipe 150, a second pipe 160, and a third pipe 170. The first pipe 150 is connected to the first drain hole 220; the second pipe 160 is connected to the second drain hole 230; and the third pipe 170 is connected to the feed hole 210. Specifically, in this embodiment, during the pressure filtration process, after the mixture between the filter plates 200 is filtered by the filter cloth 260, the filtrate will pass through the filter cloth 260 and collect in a specific drainage channel, namely the first drain hole 220. The first pipe 150 is connected to the first drain hole 220, providing a path for the filtrate to exit the equipment. Under the action of pressure difference, the filtrate flows from the first drain hole 220 into the first pipe 150, and is then guided to a suitable collection container or subsequent treatment system. Similarly, the second drain hole 230 is also a channel for collecting another part of the filtrate. The second pipe 160 connects the second drain hole 230 to the outside, allowing this part of the filtrate to be discharged smoothly. Before the pressure filtration operation begins, the mixture containing the solid particles to be filtered is stored in an external feed source. The third pipe 170 is connected to the feed port 210. When the feed pump or other equipment is started, the mixture flows under pressure through the third pipe 170 to the feed port 210. The feed port 210 then evenly distributes the mixture into the filtration space between each filter plate 200, initiating the pressure filtration process. This causes the solid particles in the mixture to be trapped on the surface of the filter cloth 260, while the liquid passes through the filter cloth 260 and is discharged.

[0042] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A caustic sludge filter-press separation device, characterized in that, The filter press body is provided with filter plates (200) and guide rails (140); the filter plates (200) are arranged linearly along the length direction of the guide rails (140); the filter plates (200) are provided with feed holes (210) at the central positions; the filter plates (200) are provided with first drainage holes (220) and second drainage holes (230) at the four corners; the filter plates (200) are provided with first filter chambers (201) on one side; the filter plates (200) are provided with grid-shaped first drainage nets (240) inside; the filter plates (200) are provided with first overflow holes (241) at the nodes of the grid-shaped first drainage nets (240); the first drainage holes (220) are communicated with the first filter chambers (201) through the first drainage nets (240) and the first overflow holes (241); the filter plates (200) are provided with second filter chambers (202) on the other side; the filter plates (200) are provided with grid-shaped second drainage nets (250) inside; the filter plates (200) are provided with second overflow holes (251) at the nodes of the grid-shaped second drainage nets (250); the second drainage holes (230) are communicated with the second filter chambers (202) through the second drainage nets (250) and the second overflow holes (251); the first filter chambers (201) and the second filter chambers (202) are provided with filter cloths (260).

2. The causticizing sludge filter-press separation apparatus according to claim 1, characterized in that, The first drainage nets (240) and the second drainage nets (250) are composed of through holes perpendicular to each other.

3. The causticizing sludge filter-press separation apparatus according to claim 2, characterized in that, The through holes are provided with plugs (270) respectively.

4. The causticizing sludge filter-press separation apparatus according to claim 1, characterized by, One side of the filter plates (200) is provided with positioning columns (280); the other side of the filter plates (200) is provided with positioning grooves (290).

5. The caustic sludge filter-press separation apparatus according to claim 4, characterized in that, The edges of the positioning grooves (290) are provided with guide inclined grooves (291).

6. The causticizing sludge filter-press separation apparatus according to claim 1, characterized in that, Both sides of the filter plates (200) are provided with guide wheels (203); the guide wheels (203) and the guide rails (140) are rolling connected.

7. The caustic sludge filter-press separation apparatus according to claim 6, characterized in that, The guide rails (140) are made of L-shaped channel steel.

8. The causticizing sludge filter-press separation apparatus according to claim 1, characterized in that, The filter cloths (260) are provided with accommodation holes (261) corresponding to the feed holes (210).

9. The causticizing sludge filter-press separation apparatus according to claim 1, characterized by, The filter press body is provided with a base frame (100), a linear drive (110), a compression plate (120) and a thrust plate (130); the guide rails (140) are arranged on the base frame (100); the thrust plate (130) is fixedly connected with the base frame (100) at one end of the guide rails (140); the linear drive (110) is fixedly connected with the base frame (100) at the other end of the guide rails (140); the output end of the linear drive (110) is drivingly connected through the base frame (100) and the compression plate (120); the compression plate (120) and the guide rails (140) are slidingly connected.

10. The caustic sludge filter-press separation apparatus according to claim 9, characterized in that, The thrust plate (130) is provided with a first pipe (150), a second pipe (160) and a third pipe (170), the first pipe (150) and the first drain hole (220) are communicated; the second pipe (160) and the second drain hole (230) are communicated; the third pipe (170) and the feeding hole (210) are communicated.

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