Fabricated formwork-removal-free steel bar truss floor support plate

Abstract

The invention relates to the technical field of floor support plates, and discloses an assembly type formwork-removal-free steel bar truss floor support plate which comprises a plurality of floor support plate assembly units. Each floor support plate assembling unit comprises a steel bar truss, a bottom plate, a plurality of plug pin mechanisms and a plurality of limiting mechanisms. The limiting mechanism comprises a pin lock assembly, a radial unlocking assembly arranged on the pin lock assembly and a driving assembly connected to the open end of the pin lock assembly. The bolt mechanisms and the limiting mechanisms which are correspondingly arranged are connected to the steel bar trusses, so that the multiple floor support plate assembling units can be spliced in any state, connecting bolts are not needed for auxiliary connection during splicing, the assembling time can be effectively shortened, and the assembling efficiency is improved. And air in the limiting mechanism can be exhausted regularly through an air pumping mechanism arranged on the limiting mechanism, so that the situation that the connecting state of the floor support unit is unstable due to corrosion of the connecting position of the limiting mechanism and the steel bar truss is prevented, and the stability of the whole steel bar truss floor support plate can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of floor decking technology, and more specifically, to a prefabricated, formwork-free steel truss floor decking. Background Technology

[0002] A steel truss is a truss made of steel bars as the top chord, bottom chord and web members, connected by resistance spot welding. A composite load-bearing plate that is connected to the base plate by resistance spot welding is called a steel truss floor deck.

[0003] Steel truss floor decking is a new type of prefabricated floor decking, belonging to the category of unsupported profiled composite floor decking. It achieves mechanized production, which is conducive to uniform spacing of steel bars and consistent thickness of concrete cover, thus improving the construction quality of the floor decking.

[0004] Existing steel truss floor decking requires additional welding equipment to weld and fix the various structures on the floor decking unit, making the assembly process cumbersome and requiring a certain level of expertise. While some steel truss floor decking systems that use a large number of bolts as a replacement for welding can eliminate the cumbersome operation of welding equipment, they require the customization of more connection modules for assembling steel bars. Furthermore, the connecting bolts are prone to corrosion and rust after long-term use, resulting in high manufacturing and replacement costs. Long-term use can also affect the connection strength and dismantling process. Summary of the Invention

[0005] The purpose of this invention is to provide a prefabricated, formwork-free steel truss floor deck to solve the above-mentioned problems.

[0006] This invention provides a prefabricated, formwork-free steel truss floor deck, comprising: Several floor decking assembly units, and the several floor decking assembly units are detachably connected; The floor deck assembly unit includes a steel truss, a base plate detachably connected to the steel truss, and several pin mechanisms and limiting mechanisms connected to the steel truss. The pin mechanisms and limiting mechanisms are symmetrically arranged and evenly distributed on the steel truss. The limiting mechanism includes a locking assembly, a radial unlocking assembly disposed on the locking assembly, and a driving assembly connected to the open end of the locking assembly. The driving assembly is used to drive the radial unlocking assembly to move radially along the locking assembly. When the pin mechanism is inserted into the locking assembly, the pin mechanism and the locking assembly are in a locked connection state. When the radial unlocking assembly moves radially along the locking assembly and applies a set pressure to the pin mechanism, the pin mechanism and the locking assembly are in an unlocked state.

[0007] As a further optimization of the present invention, the steel truss includes an upper chord, two lower chords arranged parallel to the upper chord, a plurality of web members and connecting plates, wherein the plurality of web members are respectively connected between the two lower chords and between the upper chord and the corresponding lower chord, and the plurality of connecting plates are respectively connected to the lower chord.

[0008] As a further optimization of the present invention, both the base plate and the connecting plate are provided with a plurality of connecting holes, and the base plate and the connecting plate are detachably connected by a plurality of connecting bolts, with the plurality of connecting holes corresponding to the plurality of connecting bolts.

[0009] As a further optimization of the present invention, the pin mechanism includes a first insert rod, a plurality of first slots disposed on the first insert rod, a spring fixedly connected to the inner wall of the first slot, and a wedge block fixedly connected to the other end of the spring. The wedge block is provided with a wedge surface, and the first insert rod is fixedly connected to the lower chord.

[0010] As a further optimization of the present invention, the pin locking assembly includes a connecting pipe, a limiting block fixedly connected to the inner wall of the connecting pipe, and a plurality of grooves II provided on the inner wall of the limiting block. The radial unlocking assembly is provided in the grooves II, and the plurality of grooves II are correspondingly provided with a plurality of wedges.

[0011] As a further optimization of the present invention, the radial unlocking component includes a fixed track and a hollow slide rail fixedly connected to the inner wall of the second groove, a pressing block slidably connected to the fixed track, a conical extrusion block slidably connected to the hollow slide rail, a slot provided on the pressing block, and an insertion hole provided on the limiting block. The fixed track is arranged radially along the connecting pipe, the hollow slide rail is arranged along the length of the connecting pipe, the slot is correspondingly provided with the conical extrusion block, and the insertion hole communicates with the hollow slide rail.

[0012] As a further optimization of the present invention, the driving component includes a connecting ring I connected to the open end of the connecting pipe, a bellows II connected to one end of the connecting ring I, a connecting ring II connected to the other end of the bellows II, a plurality of insert rods II connected to the inner circular surface of the connecting ring II, and a limiting slider. The plurality of insert rods II are respectively arranged to correspond to a plurality of insertion holes, and the plurality of limiting sliders are arranged to correspond to the insert rods I.

[0013] As a further optimization of the present invention, a pumping mechanism is connected between the driving component and the locking component. The pumping mechanism includes a telescopic pumping component and a one-way air guide component connected together. The telescopic pumping component is connected between the driving component and the locking component. The internal space of the telescopic pumping component is connected to the internal space of the locking component through the one-way air guide component.

[0014] As a further optimization of the present invention, the telescopic pumping assembly includes a bellows first fixedly connected between a connecting ring one and a connecting ring two, and a sealed pumping chamber is formed between the connecting ring one, the bellows second, the connecting ring two, and the bellows first.

[0015] As a further optimization of the present invention, the one-way air guide assembly includes a channel 1 and a groove 3 disposed on a connecting ring 2, a plastic sheet 1 connected to the inner wall of the groove 3, a channel 2 disposed on the connecting ring 1, a plastic sheet 2 connected to the connecting ring 1 and an air guide pipe, and a channel 3 disposed on a limiting block. The air guide pipe communicates with the internal space of the connecting pipe through the channel 3, and the channel 3 communicates with the channel 2 through the air guide pipe. The plastic sheet 1 is fixedly connected to the inner wall of the groove 3 on only one side and covers the channel 1. The plastic sheet 2 is connected to the connecting ring 1 on only one side and covers the channel 2.

[0016] The beneficial effects of this invention are as follows: By connecting corresponding pin mechanisms and limiting mechanisms on the steel truss, this invention allows several floor deck assembly units to be spliced ​​in any state without the need for connecting bolts during splicing, which can effectively shorten the assembly time. Furthermore, the air pump mechanism on the limiting mechanism can periodically discharge air from the limiting mechanism to prevent corrosion at the connection between the limiting mechanism and the steel truss, which could lead to instability in the connection state of the floor deck assembly unit. This can effectively improve the stability of the entire steel truss floor deck. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a structural schematic diagram of the floor decking assembly unit of the present invention; Figure 3 This is a partial sectional view of the floor deck assembly unit of the present invention; Figure 4 This is a view showing the cooperation of the lower chord rib, the pin mechanism, and the limiting mechanism of the present invention; Figure 5 This is the invention Figure 4 An enlarged view of point A in the image; Figure 6 This is the invention Figure 4 An enlarged view of point B in the image; Figure 7 This is the invention Figure 4 A magnified view of point C in the image; Figure 8 This is the invention Figure 4 A magnified view of point D in the image; Figure 9 This is the invention Figure 4 A magnified view of point E in the image.

[0018] In the diagram: 1. Steel truss; 101. Lower chord; 102. Web member; 103. Connecting plate; 104. Upper chord; 2. Base plate; 3. Pin mechanism; 301. Insert rod one; 302. Channel one; 303. Spring; 304. Wedge block; 3040. Wedge surface; 4. Limiting mechanism; 400. Connecting pipe; 401. Limiting block; 402. Channel two; 403. Fixed track one; 404. Lower pressure block; 404 0. Slot; 405. Hollow slide rail; 406. Conical extrusion block; 407. Insertion hole; 408. Connecting ring one; 409. Corrugated pipe two; 410. Connecting ring two; 411. Insert rod two; 412. Limiting slider; 501. Corrugated pipe one; 502. Channel one; 503. Groove three; 504. Plastic sheet one; 505. Channel two; 506. Air guide pipe; 507. Channel three; 508. Plastic sheet two. Detailed Implementation

[0019] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed merely to enable those skilled in the art to better understand and implement the subject matter described herein. Furthermore, features described in some examples may be combined in other examples.

[0020] like Figures 1 to 9 As shown, a prefabricated, formwork-free steel truss floor deck includes: Several floor decking assembly units, and several floor decking assembly units are detachably connected; The floor deck assembly unit includes a steel truss 1, a base plate 2 detachably connected to the steel truss 1, and several pin mechanisms 3 and limiting mechanisms 4 connected to the steel truss 1. The pin mechanisms 3 and limiting mechanisms 4 are symmetrically arranged and evenly distributed on the steel truss 1. The steel truss 1 includes an upper chord 104, two lower chords 101 arranged parallel to the upper chord 104, several web members 102 and connecting plates 103. The several web members 102 are respectively connected between the two lower chords 101 and between the upper chord 104 and the corresponding lower chord 101. The several connecting plates 103 are respectively connected to the lower chords 101. Both the base plate 2 and the connecting plate 103 are provided with several connecting holes. The base plate 2 and the connecting plate 103 are detachably connected by several connecting bolts. The several connecting holes are set in correspondence with the several connecting bolts. The limiting mechanism 4 includes a locking assembly, a radial unlocking assembly disposed on the locking assembly, and a driving assembly connected to the open end of the locking assembly. The driving assembly is used to drive the radial unlocking assembly to move radially along the locking assembly. When the pin mechanism 3 is inserted into the locking assembly, the pin mechanism 3 and the locking assembly are in a locked connection state. When the radial unlocking assembly moves radially along the locking assembly and applies a set pressure to the pin mechanism 3, the pin mechanism 3 and the locking assembly are in an unlocked state.

[0021] It should be noted that the floor decking assembly unit is a precast component. The connections between the lower chord 101, web members 102, connecting plate 103, and upper chord 104 in the steel truss 1 are all welded. Similarly, the pin mechanism 3 and the limiting mechanism 4 are also welded to the lower chord 101 and upper chord 104. When welding the pin mechanism 3 and the limiting mechanism 4 to the corresponding lower chord 101 or upper chord 104, it needs to be determined according to the design drawings of the entire steel truss floor decking. For several floor decking assembly units located in the outermost area of ​​the overall floor decking, the ends of the outermost lower chord 101 or upper chord 104 do not require welding of the pin mechanism 3 or the limiting mechanism 4. During the assembly of the floor decking assembly units, the pin mechanism 3 is inserted into the corresponding limiting mechanism 4, so that the pin mechanism 3 is inserted into the limiting mechanism 4. When the pin mechanism 3 is inserted into the pin lock assembly at a set position, the pin mechanism 3 and the limiting mechanism 4 are in a pin-connected state. The pin mechanism 3 cannot be pulled out or further inserted into the pin lock assembly. At this time, the pin mechanism 3 and the limiting mechanism 4 form a stable connection, which can make the two sets of steel trusses 1 in a stable connection and provide a stable shaping effect for the base plate 2. When it is necessary to release the connection between the pin mechanism 3 and the limiting mechanism 4, it is only necessary to move the drive component toward the pin lock assembly by a set distance. At this time, the drive component can drive the radial unlocking component to move along the radial direction of the pin lock assembly and apply a set force to the pin mechanism 3 after contacting it. This changes the structure that limits the pin mechanism 3 and the pin lock assembly from the locked state to the unlocked state. At this time, the pin mechanism 3 can be pulled out of the pin lock assembly.

[0022] In an optional embodiment of the invention, such as Figures 1 to 6 As shown, the pin mechanism 3 includes a first insertion rod 301, a plurality of grooves 302 provided on the first insertion rod 301, a spring 303 fixedly connected to the inner wall of the groove 302, and a wedge block 304 fixedly connected to the other end of the spring 303. The wedge block 304 is provided with a wedge surface 3040. The first insertion rod 301 is fixedly connected to the lower chord rib 101.

[0023] The locking assembly includes a connecting pipe 400, a limiting block 401 fixedly connected to the inner wall of the connecting pipe 400, and a plurality of grooves 402 provided on the inner wall of the limiting block 401. The radial unlocking assembly is provided in the grooves 402, and the plurality of grooves 402 are correspondingly provided with a plurality of wedges 304.

[0024] It should be noted that, as described above, when the latch mechanism 3 is inserted into the locking assembly, the wedge 304 on it first contacts the limiting block 401. Under the radial force generated when the wedge surface 3040 contacts the limiting block 401, the wedge 304 moves towards the first groove 302 and compresses the spring 303. That is, the wedge 304 will not encounter resistance when it is inserted into the limiting block 401. When the wedge 304 moves to the second groove 402, the spring 303 is no longer under force, and its elastic force drives the wedge 304 to reset and... Inserted into the second groove 402, the right-angle area of ​​the wedge 304 forms a stable limiting force with the second groove 402, making it impossible for the first insertion rod 301 to be pulled out from the limiting block 401. At this time, the two sets of base plates 2 are also in a stable contact state, which prevents the first insertion rod 301 from moving further into the limiting block 401. At this time, the first insertion rod 301 can form a stable connection with the limiting block 401 and the connecting pipe 400, thereby forming a stable whole between the corresponding two lower chords 101 or upper chords 104.

[0025] In an optional embodiment of the invention, such as Figure 6 As shown, the radial unlocking assembly includes a fixed track 403 and a hollow slide rail 405 fixedly connected to the inner wall of the second groove 402, a pressing block 404 slidably connected to the fixed track 403, a conical extrusion block 406 slidably connected to the hollow slide rail 405, a slot 4040 provided on the pressing block 404, and an insertion hole 407 provided on the limiting block 401. The fixed track 403 is arranged radially along the connecting pipe 400, the hollow slide rail 405 is arranged along the length of the connecting pipe 400, the slot 4040 is correspondingly provided with the conical extrusion block 406, and the insertion hole 407 is connected to the hollow slide rail 405.

[0026] It should be noted that, as mentioned above, when it is necessary to pull the insertion rod 301 out of the corresponding limiting block 401, the driving component is used to drive the conical pressing block 406 toward the lower pressing block 404. The conical surface of the conical pressing block 406 can continuously apply pressure along the radial distribution of the connecting pipe 400 to the lower end face of the slot 4040 during the movement, so that the lower pressing block 404 can continuously move toward the wedge block 304 until it contacts the wedge block 304 and begins to apply pressure to the wedge block 304, so that the wedge block 304 moves back into the groove 302. At this time, the wedge block 304 no longer forms a limiting effect with the groove 402, and the insertion rod 301 can be pulled out from the limiting block 401.

[0027] In an optional embodiment of the invention, such as Figure 4 , Figure 7 and Figure 8 As shown, the drive assembly includes a connecting ring 408 connected to the open end of the connecting pipe 400, a bellows 409 connected to one end of the connecting ring 408, a connecting ring 410 connected to the other end of the bellows 409, a plurality of insert rods 411 and a limiting slider 412 connected to the inner circular surface of the connecting ring 410. The plurality of insert rods 411 are respectively arranged corresponding to a plurality of insertion holes 407, and the plurality of limiting sliders 412 are arranged corresponding to the insert rods 301.

[0028] It should be noted that, as described above, when the drive assembly drives the conical extrusion block 406 to move along the length of the connecting pipe 400, specifically, by driving the connecting ring 410 to move toward the limiting block 401, the insertion rod 411 on the connecting ring 410 can be inserted into the insertion hole 407 on the limiting block 401, and the conical extrusion block 406 begins to move toward the lower pressure block 404. As the conical extrusion block 406 moves, the lower pressure block 404 can be driven to move radially along the connecting pipe 400. The limiting slider 412 allows the insertion rod 411 to be stably inserted into the insertion hole 407. When no adjustment is needed, the bellows 409 can be in its longest stretched state, which can provide protection for the exposed insertion rod 301, effectively preventing rainwater from directly contacting the insertion rod 301, and also preventing rainwater from penetrating into the area between the wedge block 304 and the groove 402 and into the connecting pipe 400, which can effectively slow down the rate of corrosion.

[0029] In an optional embodiment of the invention, such as Figure 4 , Figures 6 to 9 As shown, a pumping mechanism is connected between the drive assembly and the locking assembly. The pumping mechanism includes a telescopic pumping assembly and a one-way air guide assembly connected to it. The telescopic pumping assembly is connected between the drive assembly and the locking assembly. The internal space of the telescopic pumping assembly is connected to the internal space of the locking assembly through the one-way air guide assembly.

[0030] The telescopic air pump assembly includes a bellows 501 fixedly connected between a first connecting ring 408 and a second connecting ring 410, and a sealed air pump chamber is formed between the first connecting ring 408, the second bellows 409, the second connecting ring 410 and the first bellows 501.

[0031] The one-way air guide assembly includes a channel 502 and a tank 503 on a connecting ring 410, a plastic sheet 504 connected to the inner wall of the tank 503, a channel 505 on a connecting ring 408, a plastic sheet 508 connected to the connecting ring 408, an air guide pipe 506, and a channel 507 on a limiting block 401. The air guide pipe 506 communicates with the internal space of the connecting pipe 400 through the channel 507, and the channel 507 communicates with the channel 505 through the air guide pipe 506. The plastic sheet 504 is fixedly connected to the inner wall of the tank 503 on only one side and covers the channel 502. The plastic sheet 508 is connected to the connecting ring 408 on only one side and covers the channel 505.

[0032] It should be noted that, as mentioned above, the gas inside the connecting pipe 400 can be periodically discharged to reduce the amount of water vapor penetrating into the connecting pipe 400 during long-term use. Specifically, the connecting ring 410 is continuously driven to move towards or away from the limiting block 401. When the connecting ring 410 moves towards the limiting block 401, the sealing pump air chamber is in a compressed state, generating positive pressure inside. This positive pressure acts on the plastic sheet 504 and the plastic sheet 508. At this time, the plastic sheet 504 is bent outwards towards the connecting ring 410, and the plastic sheet 508 is stably pressed against the channel 505. At this time, the gas inside the sealing pump air chamber can only be discharged through the channel 502. When in the extended state, a negative pressure is generated inside, which acts on plastic sheet 504 and plastic sheet 508 respectively. Plastic sheet 504 is in a stable state of pressing on channel 502, while plastic sheet 508 bends towards the inside of the sealing pump air chamber under the action of negative pressure. At this time, the gas inside the connecting pipe 400 can be drawn into the sealing pump air chamber under the action of negative pressure. The gas flow path is to flow through the connecting pipe 400, channel 507, air guide pipe 506, and channel 505 in sequence before entering the sealing pump air chamber, and is discharged during the next compression of the sealing pump air chamber. This can effectively reduce the amount of water vapor inside the connecting pipe 400, thereby effectively slowing down the corrosion rate, and thus greatly improving the connection stability of the pin mechanism 3 and the limiting mechanism 4.

[0033] The above description of this embodiment is not limited to the specific implementation described above. The specific implementation described above is merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this embodiment, all of which are within the protection scope of this embodiment.

Claims

1. A prefabricated, formwork-free steel truss floor deck, characterized in that, include: Several floor decking assembly units, and the several floor decking assembly units are detachably connected; The floor deck assembly unit includes a steel truss (1), a base plate (2) detachably connected to the steel truss (1), and several pin mechanisms (3) and limiting mechanisms (4) connected to the steel truss (1). The pin mechanisms (3) and limiting mechanisms (4) are symmetrically arranged and evenly distributed on the steel truss (1). The limiting mechanism (4) includes a locking assembly, a radial unlocking assembly disposed on the locking assembly, and a driving assembly connected to the open end of the locking assembly. The driving assembly is used to drive the radial unlocking assembly to move radially along the locking assembly. When the pin mechanism (3) is inserted into the locking assembly, the pin mechanism (3) and the locking assembly are in a locked connection state. When the radial unlocking assembly moves radially along the locking assembly and applies a set value of pressure to the pin mechanism (3), the pin mechanism (3) and the locking assembly are in an unlocked state.

2. The prefabricated, formwork-free steel truss floor slab according to claim 1, characterized in that, The steel truss (1) includes an upper chord (104), two lower chords (101) arranged parallel to the upper chord (104), several web members (102) and connecting plates (103). Several web members (102) are respectively connected between the two lower chords (101) and between the upper chord (104) and the corresponding lower chord (101). Several connecting plates (103) are respectively connected to the lower chords (101).

3. The prefabricated, formwork-free steel truss floor decking according to claim 2, characterized in that, The base plate (2) and the connecting plate (103) are provided with a number of connecting holes. The base plate (2) and the connecting plate (103) are detachably connected by a number of connecting bolts. The number of connecting holes are provided in correspondence with the number of connecting bolts.

4. The prefabricated, formwork-free steel truss floor decking according to claim 3, characterized in that, The pin mechanism (3) includes a first insert rod (301), a plurality of grooves (302) provided on the first insert rod (301), a spring (303) fixedly connected to the inner wall of the groove (302), and a wedge (304) fixedly connected to the other end of the spring (303). The wedge (304) is provided with a wedge surface (3040), and the first insert rod (301) is fixedly connected to the lower chord rib (101).

5. A prefabricated, formwork-free steel truss floor deck according to claim 4, characterized in that, The locking assembly includes a connecting pipe (400), a limiting block (401) fixedly connected to the inner wall of the connecting pipe (400), and a plurality of grooves (402) provided on the inner wall of the limiting block (401). The radial unlocking assembly is provided in the grooves (402), and the plurality of grooves (402) are correspondingly provided with a plurality of wedges (304).

6. The prefabricated, formwork-free steel truss floor decking according to claim 5, characterized in that, The radial unlocking assembly includes a fixed track (403) and a hollow slide rail (405) fixedly connected to the inner wall of the second groove (402), a pressing block (404) slidably connected to the fixed track (403), a conical extrusion block (406) slidably connected to the hollow slide rail (405), a slot (4040) provided on the pressing block (404), and an insertion hole (407) provided on the limiting block (401). The fixed track (403) is arranged radially along the connecting pipe (400), the hollow slide rail (405) is arranged along the length direction of the connecting pipe (400), the slot (4040) is correspondingly provided with the conical extrusion block (406), and the insertion hole (407) is connected to the hollow slide rail (405).

7. A prefabricated, formwork-free steel truss floor decking according to claim 6, characterized in that, The drive assembly includes a connecting ring 1 (408) connected to the open end of the connecting pipe (400), a corrugated pipe 2 (409) connected to one end of the connecting ring 1 (408), a connecting ring 2 (410) connected to the other end of the corrugated pipe 2 (409), a plurality of insert rods 2 (411) connected to the inner circular surface of the connecting ring 2 (410), and a limiting slider (412). The plurality of insert rods 2 (411) are respectively set to correspond to the plurality of insertion holes (407), and the plurality of limiting sliders (412) are set to correspond to the insert rod 1 (301).

8. A prefabricated, formwork-free steel truss floor deck according to claim 7, characterized in that, A pumping mechanism is connected between the drive assembly and the locking assembly. The pumping mechanism includes a telescopic pumping assembly and a one-way air guide assembly connected together. The telescopic pumping assembly is connected between the drive assembly and the locking assembly. The internal space of the telescopic pumping assembly is connected to the internal space of the locking assembly through the one-way air guide assembly.

9. A prefabricated, formwork-free steel truss floor deck according to claim 8, characterized in that, The telescopic pump assembly includes a bellows (501) fixedly connected between a first connecting ring (408) and a second connecting ring (410), and a sealed pump chamber is formed between the first connecting ring (408), the second bellows (409), the second connecting ring (410), and the first bellows (501).

10. A prefabricated, formwork-free steel truss floor deck according to claim 9, characterized in that, The one-way air guide assembly includes a channel 1 (502) and a groove 3 (503) on a connecting ring 2 (410), a plastic sheet 1 (504) connected to the inner wall of the groove 3 (503), a channel 2 (505) on a connecting ring 1 (408), a plastic sheet 2 (508) and an air guide pipe (506) connected to the connecting ring 1 (408), and a channel 3 (507) on a limiting block (401). The air guide pipe (506) passes through the channel 3 (502) and the groove 3 (504) on the connecting ring 1 (410). 507) is connected to the internal space of the connecting pipe (400). The third channel (507) is connected to the second channel (505) through the air guide pipe (506). The first plastic sheet (504) is fixedly connected to the inner wall of the third tank (503) on only one side, and the first plastic sheet (504) covers the first channel (502). The second plastic sheet (508) is connected to the first connecting ring (408) on only one side, and the second plastic sheet (508) covers the second channel (505).

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