Vacuum filtration device for formed fiber cement board

Abstract

The utility model provides a vacuum suction filtration device for forming a fiber cement board, which comprises an upper groove body for forming the fiber cement board, a lower groove body detachably connected with the upper groove body, a slip sheet which is arranged in the upper groove body and moves up and down along the inner wall of the upper groove body, and a hollow handle which is communicated with the inner cavity of the lower groove body and is connected with a suction filtration pipe, a filter hole is formed in the bottom of the upper groove body, the sliding piece is arranged above the filter hole, and a base is arranged below the lower groove body. The vacuum suction filtration device for the formed fiber cement board is quick to disassemble and assemble, convenient to clean and high in production efficiency.

Description

Technical Field

[0001] This application belongs to the field of fiber cement board molding, and specifically relates to a vacuum filtration device. Background Technology

[0002] Fiber cement board is a type of board made with cement as a binder and reinforced with organic synthetic fibers, inorganic mineral fibers, or cellulose fibers. Water and chemical additives are added during its production process, and it is cured through molding, pressurization (or non-pressurization), and autoclaving (or non-autoclaving). This type of board possesses many excellent properties, such as fire resistance and insulation (achieving a non-combustible Class A rating), waterproofing, moisture resistance, heat insulation, and sound insulation. It is lightweight yet strong, easy to install, economical, aesthetically pleasing, safe for human use, and has a long service life. In the construction industry, fiber cement board has a wide range of applications, including shopping malls, hotels, hospitals, and factories. It can be used in external wall insulation systems, steel structure floors, and as ceiling materials. With the advancement of technology, people's demands for the aesthetics of buildings are increasing, and the demand for wall decoration is also constantly growing. Fiber cement board can be used as a non-removable decorative template, combined with cast-in-place floor slabs, for decorative ceilings.

[0003] Cement boards with added fibers are stronger than those without. However, more fibers are not always better; after a certain amount, the strength of the cement board tends to decrease. Therefore, before mass production of fiber cement boards, laboratory experiments are necessary to determine the optimal fiber addition amount for maximizing the flexural strength of the cement board. This provides cement board manufacturers with technical specifications (fiber addition amount, maximum flexural strength of the cement board) as a reference. Laboratory preparation of fiber cement boards requires a vacuum filtration tank. The upper part of the tank is a rectangular container, and the lower part is an inverted cone with a filtration port at the bottom. The filtration port is connected to a vacuum pump via a filtration pipe. Filter holes are located at the bottom of the container, and filter screens and filter cloths are placed above the filter holes. The prepared cement slurry is poured into the filtration tank, and the water in the cement slurry is removed using a vacuum pump. After filtration and shaping, the fiber cement board is removed from the filtration tank.

[0004] Existing filtration tanks are one-piece structures, which are cumbersome to disassemble, prone to accumulating impurities, inconvenient to clean, and slow in filtration speed. On the other hand, there is a problem of demolding difficulties. After the cement board is formed, because the space of the cement board is fixed and sealed except for the top, the four sides of the cement board stick to the inner wall of the filtration tank. When removing the cement board from the filtration tank, it is necessary to forcefully invert the container to demold it. During the demolding process, the cement board is damaged, resulting in experimental failure. Furthermore, after each cement board is filtered in a traditional filtration tank, the filtration pipe must be disconnected and the filtration tank moved to remove the formed cement board, which makes the operation cumbersome, time-consuming and labor-intensive, and seriously affects production efficiency. Summary of the Invention

[0005] To address the problems existing in the prior art, this utility model provides a vacuum filtration device for molded fiber cement boards, which is quick to assemble and disassemble, easy to clean, and has high production efficiency.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A vacuum filtration device for forming fiber cement board includes an upper tank for forming fiber cement board, a lower tank detachably connected to the upper tank, a sliding plate arranged inside the upper tank and moving up and down along the inner wall of the upper tank, and a hollow handle communicating with the inner cavity of the lower tank and connected to a filtration tube. The bottom of the upper tank has a filter hole, the sliding plate is arranged above the filter hole, and a base is provided below the lower tank.

[0008] Furthermore, the upper tank includes a trapezoidal groove that is wider at the top and narrower at the bottom, and a rectangular groove located below the trapezoidal groove. Both ends of the trapezoidal groove are open, and the top edge of the rectangular groove is connected to the bottom edge of the trapezoidal groove. A sealing plate is provided at the opening of the rectangular groove away from the trapezoidal groove, and filter holes are opened on the sealing plate. The shape of the trapezoidal groove, which is wider at the top and narrower at the bottom, makes it convenient for the operator to pour cement slurry into the upper tank. At the same time, it is easy to lift the formed cement board directly out of the upper tank when the sliding plate is pulled upward.

[0009] Furthermore, a sealing strip is arranged around the lower surface of the sealing plate. The sealing strip is located near the outer edge of the sealing plate and protrudes downward. The material of the sealing strip can be, for example, rubber.

[0010] Furthermore, the lower groove is a bottomed cuboid with an open top. The length and width of the lower groove are the same as the length and width of the rectangular groove, respectively. A limiting groove is opened on the top of the lower groove, and the position of the groove corresponds to the position of the sealing strip. The depth of the groove is less than the height of the downward protrusion of the sealing strip. When the upper and lower grooves are assembled, the sealing strip enters the groove, and the groove limits the sealing strip, thus achieving precise assembly of the upper and lower grooves.

[0011] Furthermore, the slider has a frame structure, including a top frame, diagonal bars connected to the four corners of the top frame and moving downwards towards each other, uprights connected to the bottom ends of the diagonal bars and extending vertically downwards, and a bottom frame for connecting the four uprights. A handle is fixed on the top frame to facilitate the up and down movement of the slider. The diagonal bars enclose to form a trapezoidal frame. Preferably, the shape of the trapezoidal frame is adapted to the interior of the trapezoidal groove, and the height of the trapezoidal frame is not less than the depth of the trapezoidal groove. The uprights enclose to form a rectangular frame, and the height of the uprights is not less than the depth of the rectangular groove. The bottom frame is rectangular, and the length and width of the bottom frame allow it to fit perfectly into the rectangular groove. The outer periphery of the bottom frame is in close contact with the inner wall of the rectangular groove to prevent cement slurry from seeping out from the gap between the bottom frame and the rectangular groove, and to prevent air leakage during vacuuming. The rectangular groove constitutes the molding space for the cement board. Preferably, a layer of sealant is provided on the outer periphery of the bottom frame, and the sealant material can be, for example, silicone.

[0012] Furthermore, the interior of the base frame is provided with a base frame for supporting the filter screen. The base frame may be formed, for example, by multiple intersecting base rods whose ends are connected to the base frame. The base rods may be, for example, flat plates, and the thickness of the base rods is the same as the thickness of the base frame.

[0013] Furthermore, the handle is cylindrical and connected to one side of the lower tank near the bottom edge. The free end of the handle forms an interface for connecting to the suction pipe, and the other end of the suction pipe is connected to the vacuum pump. The handle is convenient for the operator to grip and carry. In practical application, the sliding plate is placed inside the upper tank, and the bottom frame is embedded into the rectangular groove from top to bottom. The lower surface of the bottom frame abuts against the upper surface of the sealing plate. A double layer of filter screen is laid on the bottom frame, with a wetted filter cloth laid between the two layers of filter screen. A wetted filter paper is laid on top of the filter screen. The filter screen, filter cloth, and filter paper completely cover the bottom frame. Then, the vacuum pump is turned on, and the filter screen, filter cloth, and filter paper tightly cover the bottom frame. The prepared cement slurry (the volume of the cement slurry is smaller than the volume of the rectangular groove) is poured into the upper tank. The water in the cement slurry is drawn into the lower tank and then... After the handle and the suction pipe are discharged, the suction filtration is completed, and the cement board is formed inside the rectangular tank. The operator holds the handle and applies a small amount of force to slowly and steadily lift the sliding plate and the formed fiber cement board from the upper tank until they are completely detached from the upper tank, completing the demolding operation. Then, another sliding plate is placed into the upper tank, and the filter screen, filter cloth and filter paper are laid to continue forming the cement board. There is no need to disassemble the suction pipe or move the suction tank. The operation is simple. The cement board lifted from the upper tank is open on all sides, and the cement board can be easily removed from the bottom frame to avoid damage to the cement board.

[0014] Furthermore, the base includes two sets of supports arranged in a V-shape and a flat plate connected below the supports. Each set of supports consists of two support rods, the top of which is fixedly connected to the outer wall of the lower tank. The two sets of supports are symmetrically arranged at the same height. The flat plate increases the contact area with the experimental table and has a certain weight, providing stable support. The flat plate can be, for example, a steel plate with a certain thickness. The base is placed flat on the experimental table to ensure the flatness of the cement board surface.

[0015] Furthermore, the upper tank and the lower tank are connected by multiple push-button buckles. The buckles include a fixing member fixed to the outer wall of the upper tank, a movable member fixed to the outer wall of the lower tank and positioned opposite to the fixing member, and an overlapping member connecting the fixing member and the movable member. The fixing member forms a hook. The movable member includes a base plate fixedly connected to the lower tank, a handle hinged to the base plate, and a horizontal shaft rotatably connected to the handle. The horizontal shaft has a radial threaded through hole. The overlapping member includes a closed-loop body overlapping with the hook and a threaded rod connected to the closed-loop body. The end of the threaded rod away from the closed-loop body is threadedly connected to the threaded through hole. In practical applications, by rotating the threaded rod, the overlapping part adapts to the distance between the fixed and moving parts, allowing the overlapping part to lock into the hook. When the upper and lower grooves need to be assembled, the upper groove moves above the lower groove, with the sealing strip facing the groove. The upper groove moves downward, and the sealing strip enters the groove. Then, the handle is turned upward, and the horizontal shaft moves upward with the handle while rotating itself. The closed-loop body gradually approaches the hook, then the closed-loop body overlaps and hooks the hook of the fixed part. The handle is turned downward, and the threaded rod moves downward, causing the closed-loop body to press and lock into the hook. The sealing strip is evenly compressed, filling the tiny gap at the connection between the upper and lower grooves, achieving optimal sealing. When the upper and lower grooves need to be cleaned, the upper and lower grooves are separated, and the handle is turned upward again. The closed-loop body disengages from the hook, releasing the lock and disconnecting the connection between the upper and lower grooves, allowing for cleaning of the upper and lower grooves separately.

[0016] The beneficial effects of this utility model are:

[0017] This utility model discloses a vacuum filtration device for molding fiber cement boards. It features an upper tank and sliding plates. The upper tank forms the molding space for the cement board, while the sliding plates directly lift the molded cement board from the upper tank, eliminating the need to invert the filtration tank or disassemble the filtration tube. This simplifies the operation process and ensures the integrity and flatness of the cement board. The sliding plates and upper tank are separate; after one cement board is lifted from the upper tank, another sliding plate is inserted to continue molding, improving efficiency and shortening the molding cycle. The upper and lower tanks are detachably connected, facilitating cleaning and maintenance of the filtration device. A snap-fit ​​connection between the upper and lower tanks allows for quick disassembly and assembly. Sealing strips and grooves ensure precise assembly and sealing at the connection points. A base ensures the flatness of the molded cement board surface. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of a vacuum filtration device for a molded fiber cement board according to the present invention.

[0019] Figure 2 This is a longitudinal sectional perspective view of a vacuum filtration device for molded fiber cement board according to the present invention.

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0021] Figure 4 This is a sectional perspective view of the upper tank.

[0022] Figure 5 This is a schematic diagram of the slider.

[0023] Figure 6 This is a schematic diagram of the upper tank and the base.

[0024] Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0025] Figure 8 This is a diagram of the buckle.

[0026] Figure label:

[0027] 1-Upper trough body, 1001-Trapezoidal trough, 1002-Rectangular trough, 1003-Sealing plate, 2-Lower trough body, 3-Sliding plate, 301-Top frame, 302-Diagonal rod, 303-Upright rod, 304-Bottom frame, 305-Handle, 4-Handle, 5-Filter hole, 6-Base, 601-Bracket, 602-Flat plate, 7-Sealing strip, 8-Groove, 9-Base frame, 901-Bottom rod, 10-Snap fastener, 101-Fixed part, 102-Moving part, 1021-Bottom plate, 1022-Handle, 1023-Horizontal shaft, 103-Overlapping part, 1031-Closed loop body, 1032-Threaded rod, 104-Hook. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] like Figure 1-8 As shown, a vacuum filtration device for forming fiber cement board includes an upper tank 1 for forming fiber cement board, a lower tank 2 detachably connected to the upper tank 1, a sliding plate 3 arranged inside the upper tank 1 and moving up and down along the inner wall of the upper tank 1, and a hollow handle 4 communicating with the inner cavity of the lower tank 2 and connected to a filtration tube. The bottom of the upper tank 1 has a filter hole 5, the sliding plate 3 is arranged above the filter hole 5, and a base 6 is provided below the lower tank 2.

[0030] like Figure 1 , Figure 2 , Figure 4As shown, the upper tank 1 includes a trapezoidal groove 1001 that is larger at the top and smaller at the bottom, and a trapezoidal groove 1002 located below the trapezoidal groove 1001. Both ends of the trapezoidal groove 1001 are open. The top edge of the trapezoidal groove 1002 is connected to the bottom edge of the trapezoidal groove 1001. A sealing plate 1003 is provided at the opening of the trapezoidal groove 1002 away from the trapezoidal groove 1001. Filter holes 5 are opened on the sealing plate 1003. The shape of the trapezoidal groove 1001, which is larger at the top and smaller at the bottom, makes it convenient for the operator to pour cement slurry into the upper tank 1. At the same time, it is convenient to lift the formed cement board directly out of the upper tank 1 when the sliding plate 3 is lifted upward.

[0031] like Figure 3 , Figure 4 As shown, a sealing strip 7 is arranged around the lower surface of the sealing plate 1003. The sealing strip 7 is located near the outer edge of the sealing plate 1003 and protrudes downward. The material of the sealing strip 7 can be, for example, rubber.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 As shown, the lower groove 2 is a bottomed cuboid with an open top. The length and width of the lower groove 2 are the same as the length and width of the trapezoidal groove 1002, respectively. A limiting groove 8 is opened on the top of the lower groove 2. The position of the groove 8 corresponds to the position of the sealing strip 7. The depth of the groove 8 is less than the height of the downward protrusion of the sealing strip 7. When the upper groove 1 and the lower groove 2 are assembled, the sealing strip 7 enters the groove 8. The groove 8 limits the sealing strip 7, and at the same time, the upper groove 1 and the lower groove 2 are precisely assembled.

[0033] like Figure 2 , Figure 5 As shown, the slider 3 has a frame structure, including a top frame 301, diagonal bars 302 connected to the four corners of the top frame 301 and moving downwards towards each other, upright bars 303 connected to the bottom ends of the diagonal bars 302 and extending vertically downwards, and a bottom frame 304 for connecting the four upright bars 303. A handle 305 is fixed on the top frame 301 to facilitate the up and down movement of the slider 3. The diagonal bars 302 enclose a trapezoidal frame. Preferably, the shape of the trapezoidal frame is adapted to the interior of the trapezoidal groove 1001, and the height of the trapezoidal frame is not less than the depth of the trapezoidal groove 1001. The upright bars 303 enclose a trapezoidal frame. The frame is rectangular, and the height of the upright 303 is not less than the depth of the trapezoidal groove 1002. The bottom frame 304 is rectangular, and its length and width allow it to fit perfectly into the trapezoidal groove 1002. The outer periphery of the bottom frame 304 is in close contact with the inner wall of the trapezoidal groove 1002 to prevent cement slurry from seeping out from the gap between the bottom frame 304 and the trapezoidal groove 1002, and to prevent air leakage during vacuuming. The trapezoidal groove 1002 forms the molding space for the cement board. Preferably, the outer periphery of the bottom frame 304 is provided with a layer of sealant, and the sealant material can be, for example, silicone.

[0034] like Figure 2 , Figure 5 As shown, the interior of the base frame 304 is provided with a base frame 9 for supporting the filter screen. The base frame 9 can be formed, for example, by a plurality of intersecting base rods 901 whose ends are connected to the base frame 304. The base rods 901 can be, for example, flat plates, and the thickness of the base rods 901 is the same as the thickness of the base frame 304.

[0035] like Figure 6 As shown, the handle 4 is cylindrical and is connected to one side of the lower tank 2 near the bottom edge. The free end of the handle 4 forms an interface for connecting to the suction pipe, and the other end of the suction pipe is connected to the vacuum pump. The handle 4 is convenient for the operator to hold and carry. In specific applications, the sliding plate 3 is placed inside the upper tank 1, and the bottom frame 304 is embedded from top to bottom into the trapezoidal groove 1002. The lower surface of the bottom frame 304 abuts against the upper surface of the sealing plate 1003. A double layer of filter screen is laid on the bottom frame 304, with a wetted filter cloth laid between the two layers of filter screen, and a wetted filter paper laid on top of the filter screen. The filter screen, filter cloth, and filter paper completely cover the bottom frame 304. Then, the vacuum pump is turned on, and the filter screen, filter cloth, and filter paper tightly cover the bottom frame 304. The prepared cement slurry (the volume of the cement slurry is smaller than the volume of the trapezoidal groove 1002) is poured into the upper tank 1, and the water in the cement slurry is drawn to the lower tank. The cement board is discharged from the upper tank 1 through the handle 4 and the suction pipe. The suction filtration is completed, and the cement board is formed inside the trapezoidal tank 1002. The operator holds the handle 305 and applies a small amount of force to slowly and steadily lift the sliding plate 3 and the formed fiber cement board from the upper tank 1 until they are completely separated from the upper tank 1, completing the demolding operation. Then, another sliding plate 3 is put into the upper tank 1, and the filter screen, filter cloth and filter paper are laid to continue forming the cement board. There is no need to disassemble the suction pipe or move the suction tank. The operation is simple. The cement board lifted from the upper tank 1 is open on all sides, and the cement board can be easily removed from the bottom frame 304 to avoid damage to the cement board.

[0036] like Figure 1 , Figure 2 , Figure 6 As shown, the base 6 includes two sets of supports 601 arranged in a V-shape and a flat plate 602 connected below the supports 601. Each set of supports 601 consists of two support rods. The top of the support rods is fixedly connected to the outer wall of the lower tank 2. The two sets of supports 601 are symmetrically arranged at the same height. The flat plate 602 increases the contact area with the experimental table and has a certain weight, providing stable support. The flat plate 602 can be, for example, a steel plate with a certain thickness. The base 6 is placed flat on the experimental table to ensure the flatness of the cement board surface.

[0037] like Figure 1 , Figure 8As shown, the upper tank 1 and the lower tank 2 are connected by multiple push-button buckles 10. Each buckle 10 includes a fixing member 101 fixed to the outer wall of the upper tank 1, a movable member 102 fixed to the outer wall of the lower tank 2 and positioned opposite to the fixing member 101, and an overlapping member 103 connecting the fixing member 101 and the movable member 102. The fixing member 101 forms a hook 104. The movable member 102 includes a base plate 1021 fixedly connected to the lower tank 2, a handle 1022 hinged to the base plate 1021, and a horizontal shaft 1023 rotatably connected to the handle 1022. The horizontal shaft 1023 has a radial threaded through hole. The overlapping member 103 includes a closed-loop body 1031 overlapping with the hook 104 and a threaded rod 1032 connected to the closed-loop body 1031. One end of the threaded rod 1032 away from the closed-loop body 1031 is threadedly connected to the threaded through hole. In practical applications, by rotating the threaded rod 1032, the overlapping part 103 adapts to the distance between the fixed part 101 and the movable part 102, allowing the overlapping part 103 to be locked inside the hook 104. When the upper groove 1 and the lower groove 2 need to be assembled, the upper groove 1 moves above the lower groove 2, with the sealing strip 7 facing the groove 8. The upper groove 1 moves downward, and the sealing strip 7 enters the groove 8. Then, the handle 1022 is rotated upward, and the horizontal shaft 1023 moves upward with the handle 1022 while rotating itself. The closed-loop body 1031 gradually approaches the hook 104, and then the closed-loop body 1031... The hook 104 of the fixing member 101 is engaged and hooked. The handle 1022 is turned downwards, and the threaded rod 1032 moves downwards, causing the closed-loop body 1031 to be pressed and locked inside the hook 104. The sealing strip 7 is evenly compressed, filling the tiny gap at the connection between the upper groove 1 and the lower groove 2, achieving optimal sealing. When the upper groove 1 and the lower groove 2 need to be cleaned, the upper groove 1 and the lower groove 2 are separated. The handle 1022 is turned upwards again, and the closed-loop body 1031 is disengaged from the hook 104, releasing the lock and disconnecting the connection between the upper groove 1 and the lower groove 2. The upper groove 1 and the lower groove 2 are then cleaned separately.

[0038] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A vacuum filtration device for molded fiber cement boards, characterized in that, It includes an upper tank (1) for forming fiber cement board, a lower tank (2) that is detachably connected to the upper tank (1), a sliding plate (3) arranged inside the upper tank (1) and moving up and down along the inner wall of the upper tank (1), and a hollow handle (4) that communicates with the inner cavity of the lower tank (2) and connects to the suction pipe. The bottom of the upper tank (1) has a filter hole (5), the sliding plate (3) is set above the filter hole (5), and a base (6) is provided below the lower tank (2).

2. The vacuum filtration device according to claim 1, characterized in that, The upper tank (1) includes a trapezoidal groove (1001) that is larger at the top and smaller at the bottom, and a rectangular groove (1002) located below the trapezoidal groove (1001). Both ends of the trapezoidal groove (1001) are open. The top edge of the rectangular groove (1002) is connected to the bottom edge of the trapezoidal groove (1001). The opening of the rectangular groove (1002) away from the trapezoidal groove (1001) is provided with a sealing plate (1003), and filter holes (5) are opened on the sealing plate (1003).

3. The vacuum filtration device according to claim 2, characterized in that, A sealing strip (7) is arranged on the lower surface of the sealing plate (1003). The sealing strip (7) is located near the outer edge of the sealing plate (1003) and protrudes downward.

4. The vacuum filtration device according to claim 3, characterized in that, The lower groove (2) is a bottomed cuboid with an open top. The length and width of the lower groove (2) are the same as the length and width of the rectangular groove (1002). A limiting groove (8) is opened on the top of the lower groove (2). The position of the groove (8) corresponds to the position of the sealing strip (7). The depth of the groove (8) is less than the height of the sealing strip (7) protruding downwards.

5. The vacuum filtration device according to claim 1, characterized in that, The slider (3) is a frame structure. The slider (3) includes a top frame (301), diagonal bars (302) that are connected to the four corners of the top frame (301) and move downwards towards each other, upright bars (303) that are connected to the bottom end of the diagonal bars (302) and extend vertically downwards, and a bottom frame (304) for connecting the four upright bars (303). A handle (305) is fixed on the top frame (301). The diagonal bars (302) enclose a trapezoidal frame, the upright bars (303) enclose a rectangular frame, and the bottom frame (304) is rectangular.

6. The vacuum filtration device according to claim 5, characterized in that, The bottom frame (304) has a base frame (9) inside for supporting the filter screen.

7. The vacuum filtration device according to claim 1, characterized in that, The handle (4) is cylindrical, and the free end of the handle (4) forms an interface for connecting with the suction tube. The other end of the suction tube is connected to the vacuum pump.

8. The vacuum filtration device according to claim 1, characterized in that, The base (6) includes two sets of brackets (601) arranged in a figure-eight pattern and a plate (602) connected to the bottom of the brackets (601). Each set of brackets (601) consists of two support rods. The top of the support rods is fixedly connected to the outer wall of the lower tank (2). The two sets of brackets (601) are symmetrically arranged at the same height.

9. The vacuum filtration device according to claim 1, characterized in that, The upper tank (1) and the lower tank (2) are connected by multiple push-button buckles (10). Each buckle (10) includes a fastener (101) fixed to the outer wall of the upper tank (1), a movable part (102) fixed to the outer wall of the lower tank (2) and positioned opposite to the fastener (101), and an overlap part (103) connecting the fastener (101) and the movable part (102). The fastener (101) has a hook (104), and the movable part (102) includes a hook that connects to the lower tank (2). The base plate (1021) is fixedly connected, the handle (1022) is hinged to the base plate (1021), and the horizontal shaft (1023) is rotatably connected to the handle (1022). The horizontal shaft (1023) has a radial threaded through hole. The overlapping part (103) includes a closed-loop body (1031) that overlaps with the hook (104) and a threaded rod (1032) that is connected to the closed-loop body (1031). The end of the threaded rod (1032) away from the closed-loop body (1031) is threaded to the threaded through hole.

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