CN114179314A - Auxiliary matching ejection device of injection molding machine for plastic part production - Google Patents

Abstract

The invention belongs to the technical field of injection molding machines, and discloses an auxiliary matching ejection device of an injection molding machine for plastic part production, which comprises a working platform and an injection molding assembly, wherein a fixed plate is fixedly arranged on the top surface of the working platform, a fixed die is fixedly arranged on the left side surface of the fixed plate, a movable die is inserted into the left end of the fixed die, an electric control cabinet is fixedly arranged on the left end of the top surface of the working platform, and a connecting rod is connected to the middle part of the right end of the electric control cabinet in a transmission manner. The electromagnetic plug is provided with a connecting pipe, an air pump and an air outlet pipe, wherein the connecting pipe is connected with the connecting terminal, the air outlet pipe is connected with the air outlet pipe, the air outlet pipe is connected with the air inlet pipe, the air inlet pipe is connected with the air outlet pipe, the air outlet pipe is connected with the air outlet pipe, and the air outlet pipe is connected with the air outlet pipe.

Description

Auxiliary matching ejection device of injection molding machine for plastic part production

Technical Field

The invention belongs to the technical field of injection molding machines, and particularly relates to an auxiliary matching ejection device of an injection molding machine for plastic part production.

Background

The injection molding machine is a main molding device for manufacturing thermoplastic plastics or thermosetting plastics into plastic products with various shapes by utilizing a molding die, wherein the ejection device is an auxiliary matching device for pushing the plastic products out of the molding device after the plastic products are molded.

The existing ejection device is mostly composed of ejector pins, when in use, plastic products are driven to move towards the ejector pins through separation of a moving die, after the moving die is separated from a fixed die, the ejector pins move towards the plastic products, so that the plastic products are pushed out of the moving die, blanking of the plastic products is realized, but when in demolding, the ejector pins are directly contacted with the plastic products, as the ejector pins are mostly metal products, the hardness of the ejector pins is larger than that of the plastic products, and when the ejector pins are contacted with the plastic products, in order to guarantee smooth demolding of the plastic products, the moving speed of the ejector pins is generally required to be set to be faster, so that the situation that the surface of the plastic products is scratched and abraded by the ejector pins can occur when in contact, and the plastic products are damaged.

The existing ejection device realizes the demolding of the plastic product by using a movable ejector pin to contact the plastic product, but in actual use, the ejector pin is usually correspondingly designed at the middle position of the plastic product, and for the plastic product with bending and thin thickness, when the middle part of the plastic product is pushed out by the ejector pin, the bending parts at two sides of the plastic product are simultaneously ejected due to no ejector pin, so that stress concentration is caused, the bending part of the plastic product is possibly twisted under the condition of small wall thickness, the size of the plastic product cannot meet the design requirement, and the production quality of the plastic product is reduced.

When using, the existing ejection device keeps away from the fixed die through driving the movable die, so that plastic products drop downwards, demoulding and blanking are realized, most of plastic products directly fall on a working platform, but when injection moulding is carried out, the plastic products are cooled, but the temperature after cooling is still higher, when the plastic products are taken by operators, scalding can be possibly caused to the operators, and therefore the safety of the device is reduced.

Disclosure of Invention

The invention aims to provide an auxiliary matching ejection device of an injection molding machine for plastic part production, which aims to solve the problems in the background technology.

In order to achieve the above purpose, the invention provides the following technical scheme: an auxiliary matching ejection device of an injection molding machine for plastic part production comprises a working platform and an injection molding assembly, wherein a fixed plate is fixedly mounted on the top surface of the working platform, a fixed die is fixedly mounted on the left side surface of the fixed plate, a movable die is inserted into the left end of the fixed die, an electric control cabinet is fixedly mounted at the left end of the top surface of the working platform, a connecting rod is connected to the middle of the right end of the electric control cabinet in a transmission manner, the electric control cabinet drives the movable die to move backwards through the connecting rod to separate the movable die from the fixed die, an air outlet pipe and a connecting air passage are respectively formed in the middle and the bottom of the movable die, a blocking shaft is movably connected to the inner cavity of the air outlet pipe, a metal plate is fixedly mounted on the left side surface of the blocking shaft, a fixed pipe is fixedly mounted on the left side surface of the movable die, an electromagnet is fixedly mounted on the left side surface of the inner cavity of the fixed pipe, and an electrification pipe is fixedly mounted on the left side surface of the electromagnet, the middle part electric connection of automatically controlled quick-witted case right flank has the electrical connection terminal, the right flank fixed mounting of electro-magnet has reset spring, the bottom surface fixed mounting who removes the mould has the air pump, and the air pump carries out work, connects in the air flue then gets into the inner chamber of outlet duct with the air suction in the gasbag, because the left end of blockking up the axle to the outlet duct seals, gaseous right-hand member that gets into the removal mould through the outlet duct to the right-hand member completely this moment, then outwards spills over through the gap between removal mould and the plastics product, when spilling over, gaseous gap between removal mould and the plastics product that is full of, the realization is to the all-round drawing of patterns simultaneously of plastics product.

Preferably, the bottom fixed mounting who removes the mould left end has the check pipe, the bottom fixed mounting of air pump has the connecting pipe, work platform's left end fixed mounting has the gasbag, the top surface fixed mounting of gasbag inner chamber has the seal coat, and gas in the gasbag reduces partly, and the top of gasbag collapses certain distance downwards this moment, and when plastic products dropped, plastic products directly fell on the top surface of gasbag to will move certain distance downwards with partly of gasbag contact under the effect of gravity, the gasbag in the plastic products outside wrapped up plastic products all around this moment, because the inner chamber of seal coat is full of cold water, when the parcel, can absorb remaining temperature on the plastic products.

Preferably, the subassembly of moulding plastics includes actuating mechanism (201), the top fixed mounting of actuating mechanism (201) left end has inlet pipe (202), the left end fixed mounting of actuating mechanism (201) has extrusion pipe (203), the left surface fixed mounting of actuating mechanism (201) has heating element (204), heats the raw materials through heating element (204) and makes the raw materials melt, then in extrusion pipe (203) gets into the inner chamber of fixed mould, makes the molten raw materials present required plastic products shape.

Preferably, the top and the bottom of fixed plate are fixed mounting respectively has location axle and fixed axle, the top and the bottom of fixed mould are fixed mounting respectively on the surface of location axle and fixed axle, remove mould swing joint on the surface of location axle, the left end fixed mounting of location axle is on the right flank of automatically controlled quick-witted case, the right-hand member fixed mounting of connecting rod is on the left surface of removing the mould, and the location axle is when removing the mould and remove, fixes a position the motion of removing the mould, avoids removing the mould skew and crooked appear, has guaranteed the stability of device operation.

Preferably, square groove has been seted up at the top of work platform left end, square groove is located between fixed plate and the electronic control machine case in the ascending projection of horizontal direction, gasbag fixed mounting is on the bottom surface of square inslot chamber, the bottom fixed mounting of connecting pipe is in the rear end of gasbag, and the lateral wall in square groove is spacing to plastic products, has guaranteed that plastic products can be accurate fall on the gasbag.

Preferably, the heating assembly (204) is wrapped on the surface of the extrusion pipe (203), a spiral feeding rod in transmission connection with the driving mechanism (201) is arranged inside the extrusion pipe (203), the feeding pipe (202) is communicated with the extrusion pipe (203), raw materials are placed in the feeding pipe (202), the raw materials enter the extrusion pipe (203) through the feeding pipe (202), the molten raw materials are pushed into an inner cavity formed by the fixed die and the movable die through the rotation of the spiral feeding rod, and the molten raw materials are molded through the cooling pipe in the fixed die and the movable die.

Preferably, the right flank of blockking up the axle is in same vertical plane with the right flank of removing the mould on, the metal sheet is located the left side of removing the mould and contacts with the left surface of removing the mould, reset spring's right-hand member fixed mounting is on the left surface of metal sheet, and after the electro-magnet outage, reset spring's elasticity can drive the metal sheet and move to the right to reset metal sheet and jam axle.

Preferably, the length value of the power connection terminal is equal to that of the power connection pipe, the length value of the fixed pipe is five centimeters larger than that of the one-way pipe, the projection of the power connection terminal in the vertical direction is located inside the power connection pipe, when the movable die drives the fixed pipe to move leftwards to enable the power connection pipe to be in contact with the power connection terminal, the electromagnet is electrified, and the metal plate can be attracted leftwards by magnetism generated after the electromagnet is electrified.

Preferably, the top end of the connecting air passage is communicated with the bottom of the right end of the air outlet pipe, the bottom end of the connecting air passage is communicated with the one-way pipe, and the metal plate moves leftwards, so that the metal plate drives the blocking shaft to move leftwards, and the blocking shaft opens the connecting air passage towards the top end.

The invention has the following beneficial effects:

1. the electromagnetic plug is provided with a connecting pipe, an air pump and an air outlet pipe, wherein the connecting pipe is connected with the connecting terminal, the air outlet pipe is connected with the air outlet pipe, the air outlet pipe is connected with the air inlet pipe, the air inlet pipe is connected with the air outlet pipe, the air outlet pipe is connected with the air outlet pipe, and the air outlet pipe is connected with the air outlet pipe.

2. According to the pneumatic demoulding device, the demoulding is carried out in a pneumatic mode, when gas is contacted with a plastic product, the gas overflows to the periphery of the plastic product through the gap between the movable mould and the plastic product, and when the gas overflows, the gap between the movable mould and the plastic product is filled with the gas, so that the plastic product is demoulded in all directions, the stress concentration condition is avoided, the bending part of the plastic product is prevented from being distorted, and the production quality of the plastic product is improved.

3. According to the invention, after the gas in the air bag is pumped out, the gas in the air bag is partially reduced, when the plastic product falls, the plastic product directly falls on the top surface of the air bag, and a part contacting with the air bag is pressed downwards for a certain distance under the action of gravity, at the moment, the periphery of the plastic product is wrapped by the air bag outside the plastic product, and as the inner cavity of the sealing layer is filled with cold water, the residual temperature on the plastic product can be absorbed during wrapping, and the scald to an operator can be avoided by absorbing the residual temperature of the plastic product.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure fixing plate according to the present invention;

FIG. 3 is an enlarged view of the point A in FIG. 2;

FIG. 4 is a schematic view of a structural injection molding assembly attachment of the present invention;

FIG. 5 is a schematic cross-sectional view of a structural work platform of the present invention;

FIG. 6 is a schematic view of the connection of the structural connecting pipes of the present invention;

FIG. 7 is a schematic cross-sectional view of a moving mold according to the present invention;

FIG. 8 is a schematic view of an explosive connection of a structural caulk shaft of the present invention;

FIG. 9 is a schematic view of the connection of the structural seal layer of the present invention.

In the figure: 1. a working platform; 2. an injection molding assembly; 201. a drive mechanism; 202. a feed pipe; 203. extruding a pipe; 204. a heating assembly; 3. a fixing plate; 4. a fixed shaft; 5. a fixed mold; 6. positioning the shaft; 7. moving the mold; 8. an electric control cabinet; 9. a connecting rod; 10. an air outlet pipe; 11. connecting an air passage; 12. blocking the shaft; 13. a metal plate; 14. a fixed tube; 15. an electromagnet; 16. a power receiving tube; 17. an electric terminal is connected; 18. a return spring; 19. an air pump; 20. a one-way tube; 21. a connecting pipe; 22. an air bag; 23. and (4) a sealing layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 9, in the embodiment of the present invention, an auxiliary matching ejection device of an injection molding machine for producing plastic parts includes a working platform 1 and an injection molding assembly 2, a fixed plate 3 is fixedly installed on a top surface of the working platform 1, a fixed mold 5 is fixedly installed on a left side surface of the fixed plate 3, a movable mold 7 is inserted into a left end of the fixed mold 5, an electric control cabinet 8 is fixedly installed on a left end of the top surface of the working platform 1, a connecting rod 9 is connected to a middle portion of a right end of the electric control cabinet 8 in a transmission manner, the electric control cabinet 8 drives the movable mold 7 to move backward through the connecting rod 9 to separate the movable mold 7 from the fixed mold 5, an air outlet pipe 10 and a connecting air passage 11 are respectively installed at a middle portion and a bottom end of the movable mold 7, an inner cavity of the air outlet pipe 10 is movably connected with a blocking shaft 12, a metal plate 13 is fixedly installed on a left side surface of the blocking shaft 12, a fixed pipe 14 is fixedly installed on a left side surface of the movable mold 7, the left end fixed mounting of fixed tube 14 inner chamber has electro-magnet 15, the left surface fixed mounting of electro-magnet 15 has electricity-receiving pipe 16, the middle part electric connection of automatically controlled machine case 8 right flank has electrical connection terminal 17, the right flank fixed mounting of electro-magnet 15 has reset spring 18, the bottom surface fixed mounting of removal mould 7 has air pump 19, air pump 19 works, then get into the inner chamber of outlet duct 10 in connecting air flue 11 with the air suction in the gasbag 22, because block up axle 12 and seal the left end of outlet duct 10, gaseous right-hand member to the right-hand member entering removal mould 7 through outlet duct 10 completely this moment, then outwards spill over through the gap between removal mould 7 and the plastic products, when spilling over, gaseous gap between removal mould 7 and the plastic products that is full of, realize the all-round while drawing of patterns to the plastic products.

Wherein, the bottom fixed mounting who removes mould 7 left end has one-way pipe 20, the bottom fixed mounting of air pump 19 has connecting pipe 21, work platform 1's left end fixed mounting has gasbag 22, the top surface fixed mounting of gasbag 22 inner chamber has seal layer 23, gas in the gasbag 22 reduces partly, gasbag 22's top certain distance that collapses downwards this moment, when plastic products dropped, plastic products directly falls on gasbag 22's top surface, and will move certain distance with partly pushing down of gasbag 22 contact under the effect of gravity, gasbag 22 in the plastic products outside wraps up plastic products's all around this moment, because seal layer 23's inner chamber is full of cold water, when the parcel, can absorb remaining temperature on the plastic products.

The injection molding assembly 2 comprises a driving mechanism 201, a feeding pipe 202 is fixedly mounted at the top of the left end of the driving mechanism 201, an extrusion pipe 203 is fixedly mounted at the left end of the driving mechanism 201, a heating assembly 204 is fixedly mounted at the left side surface of the driving mechanism 201, the raw materials are heated by the heating assembly 204 to be melted, and then the melted raw materials enter the inner cavity of the fixed mold 5 through the extrusion pipe 203 to be in a required plastic product shape.

Wherein, the top and the bottom of fixed plate 3 are fixed mounting respectively has location axle 6 and fixed axle 4, the top and the bottom of fixed mould 5 are fixed mounting respectively on the surface of location axle 6 and fixed axle 4, remove mould 7 swing joint on the surface of location axle 6, the left end fixed mounting of location axle 6 is on automatically controlled quick-witted case 8's right flank, the right-hand member fixed mounting of connecting rod 9 is on the left surface of removing mould 7, location axle 6 is when removing mould 7 and remove, fix a position the motion of removing mould 7, avoid removing mould 7 skew and crooked appear, the stability of device operation has been guaranteed.

Wherein, square groove has been seted up at the top of 1 left end of work platform, and square groove is located between fixed plate 3 and the automatically controlled quick-witted case 8 in the ascending projection of horizontal direction, and gasbag 22 fixed mounting is on the bottom surface of square groove inner chamber, and the bottom fixed mounting of connecting pipe 21 is in the rear end of gasbag 22, and the lateral wall in square groove carries on spacingly to plastic products, has guaranteed that plastic products can be accurate fall on gasbag 22.

Wherein, the heating assembly 204 is wrapped on the surface of the extrusion pipe 203, the screw feeding rod in transmission connection with the driving mechanism 201 is arranged inside the extrusion pipe 203, the feeding pipe 202 is communicated with the extrusion pipe 203, raw materials are placed in the feeding pipe 202, the raw materials enter the extrusion pipe 203 through the feeding pipe 202, the melted raw materials are pushed into an inner cavity formed by the fixed die 5 and the movable die 7 through the rotation of the screw feeding rod, and the melted raw materials are molded through the cooling pipes in the fixed die 5 and the movable die 7.

Wherein, the right flank of blockking up axle 12 is in same vertical plane with the right flank of removing mould 7 on, metal sheet 13 be located the left side of removing mould 7 and with the left surface contact of removing mould 7, reset spring 18's right-hand member fixed mounting is on metal sheet 13's left surface, after the electro-magnet 15 outage, reset spring 18's elasticity can drive metal sheet 13 and move to the right to reset metal sheet 13 and jam axle 12.

The length value of the electric terminal 17 is equal to that of the electric connecting pipe 16, the length value of the fixed pipe 14 is five centimeters larger than that of the one-way pipe 20, the projection of the electric terminal 17 in the vertical direction is located inside the electric connecting pipe 16, when the movable die 7 drives the fixed pipe 14 to move leftwards to enable the electric connecting pipe 16 to be in contact with the electric terminal 17, the electromagnet 15 is electrified, and the metal plate 13 can be attracted leftwards by magnetism generated after the electromagnet 15 is electrified.

Wherein, the top of connecting air flue 11 communicates with the bottom of the right-hand member of outlet duct 10, and the bottom of connecting air flue 11 communicates with one-way pipe 20, and metal sheet 13 moves left to make metal sheet 13 drive and block up axle 12 and move left, make and block up axle 12 and will connect air flue 11 to the top and open.

The working principle and the using process are as follows:

in use, raw materials are placed in the feeding pipe 202, the raw materials enter the extrusion pipe 203 through the feeding pipe 202, the raw materials are heated by the heating assembly 204 to be melted, the melted raw materials are pushed into an inner cavity formed by the fixed die 5 and the movable die 7 through the rotation of the spiral feeding rod, and the melted raw materials are formed through the cooling pipes in the fixed die 5 and the movable die 7;

when demoulding, the electric control case 8 drives the movable die 7 to move backwards through the connecting rod 9, so that the movable die 7 is separated from the fixed die 5, when the movable die 7 drives the fixed tube 14 to move leftwards so that the power connection tube 16 is contacted with the power connection terminal 17, the electromagnet 15 is electrified, and the magnetism generated after the electromagnet 15 is electrified can adsorb the metal plate 13 leftwards, so that the metal plate 13 drives the blocking shaft 12 to move leftwards, and the blocking shaft 12 opens the top end of the connection air passage 11;

then the air pump 19 works to pump the air in the air bag 22 into the connecting air passage 11 and then into the inner cavity of the air outlet pipe 10, the left end of the air outlet pipe 10 is sealed by the blocking shaft 12, at the moment, the air completely enters the right end of the movable die 7 through the right end of the air outlet pipe 10 and then overflows outwards through a gap between the movable die 7 and a plastic product, and when the air overflows, the air is filled in the gap between the movable die 7 and the plastic product, so that the plastic product is demolded all around;

after the air pump 19 pumps the air in the air bag 22, the air in the air bag 22 is partially reduced, at the moment, the top end of the air bag 22 collapses downwards for a certain distance, when the plastic product falls, the plastic product directly falls on the top surface of the air bag 22, and a part contacting with the air bag 22 is pressed downwards for a certain distance under the action of gravity, at the moment, the air bag 22 outside the plastic product wraps the periphery of the plastic product, and because the inner cavity of the sealing layer 23 is filled with cold water, the residual temperature on the plastic product can be absorbed during wrapping;

after the plastic product is cooled, the movable mold 7 moves rightwards to close the fixed mold 5, at this time, the next plastic product is injected, and meanwhile, the air pump 19 fills air into the inner cavity of the air bag 22 through the one-way pipe 20 to reset the air bag 22.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The utility model provides a plastic part production is with supplementary cooperation ejecting device of injection molding machine, includes work platform (1) and injection moulding subassembly (2), its characterized in that: the device is characterized in that a fixed plate (3) is fixedly mounted on the top surface of the working platform (1), a fixed die (5) is fixedly mounted on the left side surface of the fixed plate (3), a movable die (7) is inserted into the left end of the fixed die (5), an electric control case (8) is fixedly mounted on the left end of the top surface of the working platform (1), a connecting rod (9) is connected to the middle of the right end of the electric control case (8) in a transmission manner, an air outlet pipe (10) and a connecting air passage (11) are respectively formed in the middle and the bottom end of the movable die (7), an inner cavity of the air outlet pipe (10) is movably connected with a blocking shaft (12), a metal plate (13) is fixedly mounted on the left side surface of the blocking shaft (12), a fixed tube (14) is fixedly mounted on the left side surface of the movable die (7), an electromagnet (15) is fixedly mounted on the left side surface of the inner cavity of the fixed tube (14), and an electricity-connecting tube (16) is fixedly mounted on the left side surface of the electromagnet (15), the middle part electric connection of automatically controlled quick-witted case (8) right flank has electrical terminal (17), the right flank fixed mounting of electro-magnet (15) has reset spring (18), the bottom surface fixed mounting who removes mould (7) has air pump (19).

2. The auxiliary matching ejection device of the injection molding machine for plastic part production according to claim 1, wherein: the bottom fixed mounting who removes mould (7) left end has one-way pipe (20), the bottom fixed mounting of air pump (19) has connecting pipe (21), the left end fixed mounting of work platform (1) has gasbag (22), the top surface fixed mounting of gasbag (22) inner chamber has closing layer (23).

3. The auxiliary matching ejection device of the injection molding machine for plastic part production according to claim 1, wherein: injection moulding subassembly (2) includes actuating mechanism (201), the top fixed mounting of actuating mechanism (201) left end has inlet pipe (202), the left end fixed mounting of actuating mechanism (201) has extrusion pipe (203), the left surface fixed mounting of actuating mechanism (201) has heating element (204).

4. The auxiliary matching ejection device of the injection molding machine for plastic part production according to claim 1, wherein: the top and the bottom of fixed plate (3) are fixed mounting respectively has location axle (6) and fixed axle (4), the top and the bottom of fixed mould (5) are fixed mounting respectively on the surface of location axle (6) and fixed axle (4), remove mould (7) swing joint on the surface of location axle (6), the left end fixed mounting of location axle (6) is on the right flank of automatically controlled quick-witted case (8), the right-hand member fixed mounting of connecting rod (9) is on the left surface of removing mould (7).

5. The auxiliary matching ejection device of the injection molding machine for plastic part production according to claim 2, wherein: the top of work platform (1) left end has seted up square groove, the projection of square groove on the horizontal direction is located between fixed plate (3) and automatically controlled machine case (8), gasbag (22) fixed mounting is on the bottom surface of square groove inner chamber, the bottom fixed mounting of connecting pipe (21) is in the rear end of gasbag (22).

6. The auxiliary matching ejection device of the injection molding machine for plastic part production according to claim 3, wherein: the heating assembly (204) is wrapped on the surface of the extrusion pipe (203), a spiral feeding rod in transmission connection with the driving mechanism (201) is arranged inside the extrusion pipe (203), and the feeding pipe (202) is communicated with the extrusion pipe (203).

7. The auxiliary matching ejection device of the injection molding machine for plastic part production according to claim 1, wherein: the right side surface of the blocking shaft (12) and the right side surface of the moving die (7) are located on the same vertical plane, the metal plate (13) is located on the left side of the moving die (7) and is in contact with the left side surface of the moving die (7), and the right end of the return spring (18) is fixedly installed on the left side surface of the metal plate (13).

8. The auxiliary matching ejection device of the injection molding machine for plastic part production according to claim 1, wherein: the length value of the power connection terminal (17) is equal to that of the power connection tube (16), the length value of the fixing tube (14) is five centimeters larger than that of the one-way tube (20), and the projection of the power connection terminal (17) in the vertical direction is located inside the power connection tube (16).

9. The auxiliary matching ejection device of the injection molding machine for plastic part production according to claim 1, wherein: the top end of the connecting air passage (11) is communicated with the bottom of the right end of the air outlet pipe (10), and the bottom end of the connecting air passage (11) is communicated with the one-way pipe (20).

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