CN116238800A - High-viscosity self-spraying tank - Google Patents

Abstract

The invention belongs to the technical field of spray can packaging, and discloses a high-viscosity self-spraying can, which comprises a can body with an upper opening and a lower opening, wherein a flexible bag is arranged in the can body, and the opening of the flexible bag is connected with the edge of the upper opening; the high viscosity self-spraying can further has a discharge assembly sealing the opening of the flexible pouch, the discharge assembly comprising a first delivery tube and a first closure configured to open or close the first delivery tube; the tank body is provided with a discharging assembly, the discharging assembly seals the lower opening, the discharging assembly is provided with a second conveying pipe and a second blocking piece, the second conveying pipe is communicated with the inner cavity of the tank body, the second conveying pipe is used for injecting or discharging extrusion gas into the tank body, and the second blocking piece is used for opening or closing the second conveying pipe. The caliber of the flexible bag is enlarged through the structure, so that the high-viscosity material body can be filled, the flexible bag is compressed through extrusion gas, the high-viscosity material body is uniformly extruded from the first conveying pipe, the space limitation of a traditional tool is avoided, and the operation is convenient.

Description

High-viscosity self-spraying tank

Technical Field

The invention relates to the technical field of spray can packaging, in particular to a high-viscosity self-spraying can.

Background

Spray can packages are always favored for packaging, and existing spray can packages are generally used for liquid spray products, such as: moisturizing sprays, air freshener sprays, and insecticide sprays, and the like, or for use as foam-like products, such as: heavy oil cleaning foam, bath mousse, shaving foam, etc. While high viscosity bodies, such as: silicone sealants, putty pastes and the like, and the high-viscosity material body has the characteristic of high viscosity, so that the existing spray can packaging feed inlet is too small, the high-viscosity material body cannot be filled in production, and the existing spray can form cannot enable the high-viscosity material body to be extruded from the outlet of the spray can; high-viscosity materials such as silicone sealant, putty paste and the like generally adopt auxiliary extrusion tools such as a glue gun and the like, and have certain space limitation due to larger volume. Therefore, a spray can is needed to be capable of filling high-viscosity materials, and can realize automatic extrusion of high-viscosity liquid or paste, so that the spray can is convenient to use.

Disclosure of Invention

The invention aims to provide a high-viscosity self-spraying tank, which can enlarge a filling opening to fill a high-viscosity material body through binary arrangement of a flexible bag and a tank body and can squeeze the flexible bag to squeeze the high-viscosity material body in the flexible bag.

To achieve the purpose, the invention adopts the following technical scheme:

a high viscosity self-blowing can for extruding a high viscosity body comprising:

the tank body is provided with an upper opening and a lower opening;

a flexible pouch disposed within the canister, an opening edge of the flexible pouch being connected to the upper opening edge to close the upper opening;

a tap assembly sealing an opening of the flexible bladder, the tap assembly comprising a first delivery tube having an end outlet deep into the flexible bladder to cause high viscosity material within the flexible bladder to be extruded from the first delivery tube and a first closure configured to open or close the first delivery tube;

the discharging assembly seals the lower opening, the filling assembly is provided with a second conveying pipe and a second blocking piece, the second conveying pipe is communicated with the inner cavity of the tank body, the second conveying pipe is configured to inject or discharge extrusion gas into the tank body, and the second blocking piece is configured to open or close the second conveying pipe.

Preferably, the discharging assembly comprises an upper sealing plate, and the edge of the upper sealing plate, the edge of the opening of the flexible bag and the edge of the upper opening of the tank body are curled to form a first curled edge sealing structure.

Preferably, the sealing device further comprises a first gasket, and the first gasket is clamped in the first hemming sealing structure.

Preferably, the upper sealing plate is provided with a first inserting hole, the first conveying pipe is inserted into the first inserting hole, an outlet of the first conveying pipe in the flexible bag is arranged on the side wall of the first conveying pipe, and a first limiting part is arranged at the end part of the first conveying pipe in the flexible bag; the first plugging piece comprises a deformable compression ring and a plugging ring which are connected, the plugging ring is sleeved on the first conveying pipe, a plugging groove is formed in the circumference of the side wall of the plugging ring, the edge of the first plugging hole is plugged in the plugging groove, so that the plugging ring in the flexible bag seals an outlet of the first conveying pipe in the flexible bag; the first conveying pipe is positioned outside the tank body and is further provided with a second limiting part, the compression ring is sleeved on the first conveying pipe, one end of the compression ring is connected with the plugging ring, and the other end of the compression ring is abutted against the second limiting part.

Preferably, the filling assembly includes a lower closure plate that forms a second bead seal with a lower opening edge of the can body.

Preferably, there is also a second gasket which is sandwiched in the second bead seal structure.

Preferably, the lower sealing plate is provided with a second inserting hole, the second inserting hole is located at one side of the tank body and is communicated with the second conveying pipe, the second conveying pipe is connected with the lower sealing plate, a second blocking piece is clamped between the end portion of the second conveying pipe and the lower sealing plate, a sliding pipe with one end open is slidingly connected in the second conveying pipe, the closed end of the sliding pipe penetrates into the second conveying pipe, the size of the sliding pipe is smaller than the inner size of the second conveying pipe, a penetrating air hole is formed in the side wall of the sliding pipe, the second blocking piece can open or close the air hole and a gap between the second conveying pipe and the sliding pipe in the sliding process of the sliding pipe, and an elastic piece is connected between the sliding pipe and the inner wall of the second conveying pipe so as to keep the trend of the second blocking piece to block the air hole.

Preferably, the second conveying pipe is a stepped pipe with a large-diameter section and a small-diameter section connected, the sliding pipe is slidably connected with the large-diameter section, the elastic piece is a pressure spring, one end of the pressure spring is connected with a stepped part in the second conveying pipe, and the other end of the pressure spring is connected with the sliding pipe.

Preferably, the side wall of the sliding tube is provided with an annular groove, the air hole is arranged in the annular groove, the second blocking piece is a sealing ring, and the inner edge of the sealing ring is provided with an annular convex circle matched with the annular groove.

Preferably, the outer wall of the second conveying pipe is provided with a limiting boss, and the lower sealing plate is provided with a limiting recess matched with the limiting boss so as to fix the second conveying pipe.

The invention has the beneficial effects that:

tank body, flexible bag and ejection of compact subassembly are connected jointly to the bore of flexible bag has been enlarged, thereby can be smoothly to flexible bag filling high viscosity's material body when production, and can be to the internal extrusion gas that pours into of tank at the filling component, through the flexible bag of the pressure compression of extrusion gas, open first conveyer pipe when first shutoff piece, thereby can make flexible bag warp and extrude the high viscosity material body of inside from first conveyer pipe, thereby avoided the space restriction of traditional instrument, make the operation more convenient.

Drawings

FIG. 1 is a cross-sectional view of a high viscosity self-spray can of the present invention;

FIG. 2 is an enlarged view at A in FIG. 1;

fig. 3 is an enlarged view at B in fig. 1.

In the figure:

1. a tank body; 2. a flexible pouch; 3. a discharge assembly; 31. a first delivery tube; 311. a first limit part; 312. a second limit part; 32. a first blocking member; 321. a compression ring; 322. a plugging ring; 323. a plug-in groove; 33. an upper sealing plate; 4. a filling assembly; 41. a second delivery tube; 42. a second blocking member; 43. a lower sealing plate; 44. a sliding tube; 441. air holes; 45. an elastic member; 5. a first gasket; 6. and a second gasket.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", etc., azimuth or positional relationship are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description and simplification of operations, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1 to 3, the present embodiment provides a high viscosity self-spraying can for extruding a high viscosity material, the high viscosity self-spraying can comprising a can body 1 having an upper opening and a lower opening, wherein a flexible pouch 2 is provided in the can body 1, and an opening edge of the flexible pouch 2 is connected to an upper opening edge to close the upper opening; the high-viscosity self-spraying tank is further provided with a discharging assembly 3, the discharging assembly 3 seals the opening of the flexible bag 2, the discharging assembly 3 comprises a first conveying pipe 31 and a first blocking piece 32, one end outlet of the first conveying pipe 31 extends to the flexible bag 2 so that high-viscosity material in the flexible bag 2 is extruded from the first conveying pipe 31, and the first blocking piece 32 is configured to open or close the first conveying pipe 31; in addition, there is a filling assembly 4, the filling assembly 4 seals the lower opening, the filling assembly 4 is provided with a second delivery pipe 41 and a second blocking member 42 which are communicated with the inner cavity of the can 1, the second delivery pipe 41 is configured to inject or discharge the extrusion gas into or into the can 1, and the second blocking member 42 is configured to open or close the second delivery pipe 41.

Through the structure, the tank body 1, the flexible bag 2 and the discharging component 3 are connected together, so that the caliber of the flexible bag 2 is enlarged, the high-viscosity material body can be smoothly filled into the flexible bag 2 during production, the filling component 4 can inject extrusion gas into the tank body 1, the flexible bag 2 is compressed by the pressure of the extrusion gas, when the first conveying pipe 31 is opened by the first blocking piece 32, the flexible bag 2 can be deformed, the internal high-viscosity material body is extruded from the first conveying pipe 31, and therefore, the space limitation of a traditional tool is avoided, and the operation is more convenient.

Turning now to the present embodiment in detail, as shown in fig. 1, the present embodiment provides a high viscosity self-spraying can for extruding a high viscosity material, the high viscosity self-spraying can comprising a can body 1 having an upper opening and a lower opening; in addition, the flexible bag 2 is arranged in the tank 1 so as to be capable of containing a high-viscosity material, and the specific size of the flexible bag 2 can be set according to the size of the tank 1, and can be selected from but not limited to an aluminum bag. The upper opening of the tank body 1 is connected with the edge of the opening of the flexible bag 2 to close the upper opening, so that the opening of the flexible bag 2 can be maximized under the limitation of the tank body 1, and the high-viscosity material body is filled during production conveniently, and meanwhile, the flexible bag 2 is packaged conveniently.

As shown in fig. 1-2, the high viscosity self-spraying can also has a discharge assembly 3, the discharge assembly 3 sealing the opening of the flexible pouch 2; specifically, the discharging assembly 3 comprises an upper sealing plate 33, and the edge of the upper sealing plate 33 is curled with the edge of the opening of the flexible bag 2 and the edge of the upper opening of the tank body 1 to form a first curled edge sealing structure. The flexible bag 2 is sealed by forming a first hemming seal structure between the edges of the three, and the high-viscosity material is sealed therein. More specifically, there is also a first gasket 5, the first gasket 5 being sandwiched in the first bead seal structure. By way of example, the first gasket 5 may include, but is not limited to, a rubber gasket that clamps the contact surfaces of the edges of the upper closing plate 33 and the opening edge of the flexible pouch 2, and the upper opening edge of the can 1. The upper sealing plate 33 of the high-viscosity self-spraying tank is provided with a first inserting hole, a first conveying pipe 31 is inserted into the first inserting hole, and one end outlet of the first conveying pipe 31 extends to the flexible bag 2 so that high-viscosity materials in the flexible bag 2 can be extruded from the first conveying pipe 31; and the outfeed assembly 3 has a first closure member 32, the first delivery tube 31 being moved relative to the first closure member 32 so that the first closure member 32 opens or closes the first delivery tube 31. In particular, the outlet of the first delivery tube 31 in the flexible pouch 2 is provided in the side wall of the first delivery tube 31, it being understood that the outlet provided in the side wall of the first delivery tube 31 is more conveniently plugged. The end part of the first conveying pipe 31 positioned in the flexible bag 2 is provided with a first limit part 311; the first plugging member 32 comprises a deformable compression ring 321 and a plugging ring 322 which are connected, the plugging ring 322 is sleeved on the first conveying pipe 31, the side wall of the plugging ring 322 is circumferentially provided with a plugging groove 323, and the edge of the first plugging hole is plugged in the plugging groove 323 to fix the plugging ring 322; while a blocking ring 322 located within the flexible pouch 2 closes the outlet of the first delivery tube 31 located within the flexible pouch 2. So that when the first delivery tube 31 is pressed downward, the first delivery tube 31 moves relative to the first blocking member 32 so that the outlet of the first delivery tube 31 within the flexible pouch 2 is opened so that high viscosity material can be delivered from the first delivery tube 31 to the outside of the flexible pouch 2; it should be noted that, for convenience in pressing, the end of the first conveying pipe 31 exposed out of the tank body 1 may be connected with a pressing device, and the pressing device is not described in detail in the prior art, and the type of the pressing device may be selected according to the filled high-viscosity material. When the first conveying pipe 31 returns upwards, the outlet of the first conveying pipe 31 in the flexible bag 2 is sealed by the sealing ring 322, so that the high-viscosity material body is sealed in the flexible bag 2; the first limiting part 311 and the upper sealing plate 33 clamp the part of the blocking ring 322 positioned in the flexible bag 2 to prevent the first conveying pipe 31 from sliding upwards; the first limiting portion 311 is a circular table disposed along the axial direction of the first conveying pipe 31, and other embodiments may also be other limiting plates disposed at the end of the first conveying pipe 31. The first conveying pipe 31 is provided with a second limiting part 312 outside the tank body 1, a compression ring 321 is sleeved on the first conveying pipe 31, one end of the compression ring 321 is connected with a blocking ring 322, and the other end of the compression ring 321 is abutted against the second limiting part 312; with the above structure, the first plugging member 32 provides a seal between the first plugging hole and the first conveying pipe 31 on the one hand, and when the first conveying pipe 31 is opened downwards to be located at the outlet of the flexible bag 2 by external force, the deformable compression ring 321 can be compressed by the second limiting part 312 and the plugging ring 322 located at the outer side of the tank body 1, when the external force is lost, the first conveying pipe 31 can be quickly returned to enable the plugging ring 322 to continuously plug the outlet of the first conveying pipe 31 located in the flexible bag 2, so that the trend that the outlet of the first conveying pipe 31 located in the flexible bag 2 is kept under the reset effect. More specifically, the compression ring 321 and the blocking ring 322 are integrally formed in this embodiment, and may be made of an elastic rubber material, including but not limited to.

As shown in fig. 3, the high viscosity self-spray can further has a filling assembly 4, the filling assembly 4 blocks the lower opening of the can body 1, and the filling assembly 4 is provided with a second delivery pipe 41 communicating with the inner cavity of the can body 1, the second delivery pipe 41 being configured to inject or discharge the extrusion gas into or into the can body 1. Specifically, the filling assembly 4 includes a lower sealing plate 43, and the lower sealing plate 43 and the lower opening edge of the can body 1 form a second curled sealing structure; more specifically, the second bead seal structure further includes a second gasket 6 interposed therebetween, and exemplary second gaskets 6 include, but are not limited to, rubber gaskets. More specifically, the lower sealing plate 43 is provided with a second plugging hole, one side of the second plugging hole in the tank 1 is communicated with the second conveying pipe 41, and the second conveying pipe 41 is connected with the lower sealing plate 43. For example, in this embodiment, a snap fit may be used for ease of installation. The outer wall of the second conveying pipe 41 is provided with a limiting boss, and the lower sealing plate 43 is provided with a limiting recess matched with the limiting boss so as to fix the second conveying pipe 41. In other embodiments, the second conveying pipe 41 may be directly welded to the edge of the second plugging hole. The second conveying pipe 41 of the present embodiment is slidably connected with a sliding pipe 44, one end of the sliding pipe 44 is closed, wherein the closed end of the sliding pipe 44 extends into the second conveying pipe 41, the size of the sliding pipe 44 is smaller than that of the second conveying pipe 41, and the sidewall of the sliding pipe 44 is provided with a through air hole 441, so that extrusion gas can enter through the air hole 441 and pass through a gas circulation channel formed between the outer wall of the sliding pipe 44 and the inner wall of the second conveying pipe 41 to be injected into the tank 1. The second conveying pipe 41 of this embodiment is a stepped pipe in which a large diameter section and a small diameter section are connected, and the sliding pipe 44 is slidingly connected in the large diameter section.

The high viscosity self-spray can further includes a second blocking member 42, the second blocking member 42 being configured to be capable of opening or closing the air hole 441 and the gap between the inside of the second delivery pipe 41 and the sliding pipe 44 during the sliding of the sliding pipe 44; specifically, the side wall of the sliding tube 44 has an annular groove, the air hole 441 is disposed in the annular groove, the second blocking member 42 is a sealing ring, the sealing ring is pressed between the second conveying tube 41 and the lower sealing plate 43, and the inner edge of the sealing ring has an annular bulge matched with the annular groove so as to block the air hole 441 on the side wall of the sliding tube 44 and a gap between the second conveying tube 41 and the sliding tube 44. In addition, an elastic member 45 is connected between the sliding tube 44 and the inner wall of the second conveying tube 41 to keep the tendency of the second blocking member 42 to block the air hole 441, specifically, the elastic member 45 is a compression spring, one end of the compression spring is connected to the step in the second conveying tube 41, and the other end of the compression spring is connected to the sliding tube 44.

The filling mode and the using method of the high-viscosity self-spraying tank are briefly described as follows:

in production, a high-viscosity material body can be injected into the flexible bag 2, and then the flexible bag 2, the tank body 1 and the upper sealing plate 33 on the filling assembly 4 clamp the first sealing gasket 5 for hemming sealing; the lower sealing plate 43 is sealed by curling the same as the tank body; the air hole 441 is separated from the second blocking member 42 by pushing the sliding tube 44 on the filling assembly 4 by the air needle, so that the extrusion air can enter through the air hole 441 and is injected into the tank 1 through the air circulation channel formed between the outer wall of the sliding tube 44 and the inner wall of the second conveying tube 41, after the extrusion air reaches a proper pressure (specifically, the extrusion air can be set according to the size of the tank 1), the air needle is separated, the pressure spring returns the sliding tube 44 to the original position, and the second blocking member 42 seals the air hole 441 and the gaps between the second conveying tube 41 and the sliding tube 44. In use, the first conveying pipe 31 is pressed down, so that the outlet of the first conveying pipe 31 in the flexible bag 2 leaves the blocking ring 322, and the extrusion gas extrudes the flexible bag 2 to extrude the high-viscosity material; after the use is completed, the first conveying pipe 31 is released and pressed down to return. When the high-viscosity material in the flexible bag 2 is used, the extruding gas in the tank 1 can be reversely discharged by pushing the sliding tube 44 on the filling assembly 4, so as to prevent the abandoned tank 1 from being accidentally damaged due to the storage of the high-pressure extruding gas.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. A high viscosity self-blowing can for extruding a high viscosity body comprising:

the tank comprises a tank body (1), wherein the tank body (1) is provided with an upper opening and a lower opening;

the flexible bag (2) is arranged in the tank body (1), and the opening edge of the flexible bag (2) is connected with the upper opening edge to close the upper opening;

-a tapping assembly (3), the tapping assembly (3) sealing the opening of the flexible pouch (2), the tapping assembly (3) comprising a first delivery tube (31) and a first closure (32), an outlet of one end of the first delivery tube (31) extending to the flexible pouch (2) to cause a high viscosity material within the flexible pouch (2) to be extruded from the first delivery tube (31), the first closure (32) being configured to open or close the first delivery tube (31);

-a filling assembly (4), the filling assembly (4)) sealing the lower opening, the filling assembly (4) being provided with a second delivery tube (41) communicating with the inner cavity of the tank (1) and a second closure (42), the second delivery tube (41) being configured to inject or expel a squeeze gas into the tank (1), the second closure (42) being configured to open or close the second delivery tube (41).

2. The high-viscosity self-spraying can according to claim 1, wherein the discharging assembly (3) comprises an upper sealing plate (33), and a first curled edge sealing structure is formed by curling the edge of the upper sealing plate (33), the edge of the opening of the flexible bag (2) and the edge of the upper opening of the can body (1).

3. A high viscosity self-spraying can according to claim 2, further having a first gasket (5), the first gasket (5) being sandwiched in the first bead seal arrangement.

4. The high-viscosity self-spraying tank according to claim 2, wherein the upper sealing plate (33) is provided with a first inserting hole, the first conveying pipe (31) is inserted into the first inserting hole, an outlet of the first conveying pipe (31) in the flexible bag (2) is arranged on the side wall of the first conveying pipe (31), and a first limiting part (311) is arranged at the end of the first conveying pipe (31) in the flexible bag (2); the first blocking piece (32) comprises a deformable compression ring (321) and a blocking ring (322) which are connected, the blocking ring (322) is sleeved on the first conveying pipe (31), a plugging groove (323) is circumferentially formed in the side wall of the blocking ring (322), and the edge of the first plugging hole is plugged in the plugging groove (323) so that the blocking ring (322) positioned in the flexible bag (2) seals an outlet of the first conveying pipe (31) positioned in the flexible bag (2); and the first conveying pipe (31) is positioned outside the tank body (1) and is further provided with a second limiting part (312), the compression ring (321) is sleeved on the first conveying pipe (31), one end of the compression ring (321) is connected with the blocking ring (322), and the other end of the compression ring is abutted against the second limiting part (312).

5. A high viscosity self-spraying can according to claim 1, wherein the filling assembly (4) comprises a lower closing plate (43), the lower closing plate (43) forming a second bead seal with the lower open edge of the can body (1).

6. The high viscosity self-spraying can according to claim 5, further comprising a second gasket (6), said second gasket (6) being sandwiched in said second bead seal.

7. The high-viscosity self-spraying tank according to claim 5, wherein the lower sealing plate (43) is provided with a second plugging hole, one side of the second plugging hole in the tank body (1) is communicated with the second conveying pipe (41), the second conveying pipe (41) is connected with the lower sealing plate (43), a second sealing member (42) is clamped between the end part of the second conveying pipe (41) and the lower sealing plate (43), a sliding pipe (44) with one open end is connected in the second conveying pipe (41) in a sliding mode, the closed end of the sliding pipe (44) penetrates into the second conveying pipe (41), the size of the sliding pipe (44) is smaller than the inner size of the second conveying pipe (41), a through air hole (441) is formed in the side wall of the sliding pipe (44), and the second sealing member (42) can open or close the air hole (441) in the sliding process of the sliding pipe (44) and the gap between the sliding pipe (41) and the sliding pipe (44) and the sliding pipe (45) is connected with the air hole (45).

8. The high-viscosity self-spraying tank according to claim 7, wherein the second conveying pipe (41) is a stepped pipe formed by connecting a large-diameter section and a small-diameter section, the sliding pipe (44) is slidably connected to the large-diameter section, the elastic piece (45) is a pressure spring, one end of the pressure spring is connected to a stepped part in the second conveying pipe (41), and the other end of the pressure spring is connected to the sliding pipe (44).

9. The high viscosity self-spraying can of claim 7 wherein the side wall of the sliding tube (44) has an annular groove, the air hole (441) is disposed in the annular groove, the second blocking member (42) is a sealing ring, and an inner edge of the sealing ring has an annular convex shape that mates with the annular groove.

10. The high-viscosity self-spraying tank according to claim 8, wherein the outer wall of the second conveying pipe (41) is provided with a limiting boss, and the lower sealing plate (43) is provided with a limiting recess matched with the limiting boss so as to fix the second conveying pipe (41).

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