Aircraft tire shaping and heating mechanism

Abstract

The utility model relates to the technical field of aviation tire production, in particular to an aviation tire shaping and heating mechanism, which not only facilitates the removal of a formed tire from a mold and prevents a worker from being injured or scalded, but also accelerates the cooling of the tire after the tire is formed and improves the working efficiency. Comprising a heat dissipation mechanism; the mold further comprises a lower mold mechanism, an upper mold mechanism, an air supply mechanism and a discharging mechanism, the lower mold mechanism is installed on the heat dissipation mechanism, the upper mold mechanism is installed on the heat dissipation mechanism, and the lower mold mechanism and the upper mold mechanism are matched to shape and heat the aircraft tire. The air supply mechanism is mounted on the lower mold mechanism, so that the aircraft tire is heated more uniformly, the tire can be quickly cooled after being formed, the discharging mechanism is mounted on the heat dissipation mechanism, the tire can be conveniently taken out of the mold, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation tire production, in particular to an aviation tire shaping and heating mechanism. Background Art

[0002] Aircraft tires are important components for aircraft takeoff, landing, and taxiing. Their performance and quality are directly related to flight safety. They must be able to withstand extreme conditions such as high speed, high temperature, and high pressure during takeoff and landing, while also having good wear resistance, anti-slip, and impact resistance.

[0003] Existing aircraft tire shaping heating mechanisms, such as the electric heating mold for vulcanizing tires and its temperature control system disclosed in Chinese utility model patent application number CN2021212542478, mainly include electrically controlled heating units arranged on the upper, lower, and outer sides of the tire shaping mold, a heat-insulating protective cover arranged around the heating unit to reduce heat dissipation, and a temperature control unit provided on the heating unit or the tire shaping mold near the heating unit to control the current or voltage of the heating unit to ensure heat output by the heating element. During use, the upper thermal insulation plate is in direct contact with the non-mold contact surface of the upper heating plate, the lower thermal insulation plate is in direct contact with the non-mold contact surface of the lower heating plate, the upper annular thermal insulation side plate is in direct contact with the outer surface of the upper heating plate, the outer surface of the annular heating plate, the lower annular thermal insulation side plate is in direct contact with the outer surface of the lower heating plate, and the outer surface of the lower mold. The mold heating unit and the heated mold are formed into a complete insulation system through the above heat-insulating protective cover.

[0004] However, the tire heating mechanism of the prior art is difficult to remove from the mold after the tire is formed, which can easily burn or injure workers. In addition, it takes a long time to cool down after shaping, resulting in relatively low work efficiency. Utility Model Content

[0005] To solve the above technical problems, the utility model provides an aviation tire shaping and heating mechanism that not only facilitates the removal of the formed tire from the mold, preventing workers from being injured or scalded, but also accelerates the cooling of the tire after shaping, thereby improving work efficiency.

[0006] The utility model discloses an aircraft tire shaping and heating mechanism, comprising a heat dissipation mechanism; further comprising a lower mold mechanism, an upper mold mechanism, an air supply mechanism and a blanking mechanism, wherein the lower mold mechanism is mounted on the heat dissipation mechanism, and the upper mold mechanism is mounted on the heat dissipation mechanism, and the lower mold mechanism and the upper mold mechanism cooperate to perform shaping and heating on the aircraft tire, the air supply mechanism being mounted on the lower mold mechanism not only makes the heating of the aircraft tire more uniform, but also allows the tire to be quickly cooled after being formed, the blanking mechanism is mounted on the heat dissipation mechanism and facilitates the tire to be taken out from the mold, thereby improving work efficiency; a tire blank is placed in the lower mold mechanism, the upper mold mechanism descends and cooperates with the lower mold mechanism to heat and shape the tire blank, and at the same time, the air supply mechanism is started to supply air to the lower mold mechanism and the upper mold mechanism, thereby making the heating of the tire more uniform, and after the tire is formed, the upper mold mechanism rises, the air supply mechanism uses wind force to accelerate air flow, promotes rapid cooling of the tire, and then the blanking mechanism takes the tire out, thereby improving work efficiency and saving the trouble of workers in blanking.

[0007] Preferably, the heat dissipation mechanism includes a workbench, two groups of baffles, a top plate and two groups of cooling fans. The bottom end of the workbench is connected to the ground, the bottom ends of the two groups of baffles are connected to the top of the workbench, one group of baffles has a heat dissipation groove on the side wall, the bottom end of the top plate is connected to the top ends of the two groups of baffles, and the two groups of cooling fans are installed in the heat dissipation grooves of the baffles; when the tire is formed, the lower mold mechanism and the upper mold mechanism are separated, and the two groups of cooling fans are started to accelerate the air flow on the tire surface, quickly reduce the surface temperature of the tire, and improve work efficiency.

[0008] Preferably, the lower mold mechanism includes a motor, a reducer, a transmission shaft 1, a turntable, a heat insulation board 1, four groups of electric heating wires 1 and a mold 1. The motor is mounted on a workbench, the reducer is mounted on the workbench, the transmission shaft 1 is rotatably mounted on the workbench and is longitudinally connected to the reducer, the turntable is rotatably mounted on the top of the workbench and is connected to the transmission shaft 1 transmission tube, the bottom end of the heat insulation board 1 is connected to the top of the workbench, the four groups of electric heating wires 1 are all mounted on the heat insulation board 1, and the mold 1 is mounted on the turntable; the tire blank is placed in the mold 1, the heat insulation wire 1 is started, and the heat insulation wire 1 heats the mold 1, thereby forming the tire blank, and by setting the four groups of electric heating wires 1, the heating of the tire blank is made more uniform, and by setting the heat insulation board 1, heat loss is prevented. After the tire is formed, the unloading mechanism adsorbs the tire, and then the motor is started. The motor drives the transmission shaft 1 to rotate through the reducer, and the transmission shaft 1 drives the mold 1 to rotate through the turntable, thereby separating the mold 1 and the tire, and preventing the tire from sticking to the mold.

[0009] Preferably, the upper mold mechanism includes a hydraulic cylinder, four groups of guide rods, a heat insulation plate 2, a mold 2 and four groups of electric heating wires 2. The top of the hydraulic cylinder is connected to the bottom end of the top plate, the top of the four groups of guide rods is connected to the bottom end of the top plate, the top of the heat insulation plate 2 is connected to the four groups of guide rods and the bottom end of the hydraulic cylinder. The mold 2 is installed in the heat insulation plate 2, and the four groups of electric heating wires 2 are all installed in the heat insulation plate 2; start the hydraulic cylinder, the hydraulic cylinder pushes the electric heating wire 2 to descend, and by setting four groups of guide rods, the electric heating wire 2 can be vertically lowered to prevent deviation, the mold 2 and the mold 1 are closed, the heat insulation plate 2 and the heat insulation plate 1 are closed, and the electric heating wire 2 is started to heat the mold 2. By setting four groups of electric heating wires 2, the heating of the mold 2 is more uniform. After the tire is formed, the hydraulic cylinder drives the heat insulation plate 2 and the mold 2 to reset.

[0010] Preferably, the air supply mechanism includes a second transmission shaft, an air pump, an exhaust pipe, an air supply hose and a nozzle. The second transmission shaft is rotatably mounted on the reducer, the air pump is mounted on the workbench, the exhaust pipe is mounted on the air pump, the air supply hose is mounted on the air pump and is connected to the interior of the heat insulation board 1 and the heat insulation board 2, the nozzle is mounted on the baffle and is connected to the interior of the air supply hose, and a valve is mounted on the nozzle; the reducer drives the second transmission shaft to rotate, and the second transmission shaft rotates to drive the air pump to extract air. The air pump draws in outside air through the exhaust pipe, and then transports it to the heat insulation board 1 and the heat insulation board 2 through the air supply hose, so that the heat in the heat insulation board 1 and the heat insulation board 2 is more evenly distributed. After the tire is formed, the valve of the nozzle is opened, and the nozzle sprays gas onto the tire to accelerate the heat loss from the tire surface.

[0011] Preferably, the unloading mechanism includes a base plate, a servo motor, a cylinder, a connecting plate, an air dividing valve, three groups of connecting rods, three groups of suction cups and an exhaust hose. The base plate is mounted on the workbench, the servo motor is mounted on the base plate, the cylinder is mounted on the workbench and the bottom end of the cylinder is transmission-connected to the servo motor, the top end of the cylinder is slidably inserted in the workbench, the connecting plate is mounted on the cylinder, the air dividing valve is mounted on the connecting plate, the three groups of connecting rods are mounted on the air dividing valve and are connected to the inside of the air dividing valve, the three groups of suction cups are respectively mounted on the three groups of connecting rods and are connected to the inside of the connecting rod, one end of the exhaust hose is connected to the inside of the air dividing valve, and the other end of the exhaust hose is connected to the inside of the exhaust pipe; start the servo motor, the servo motor drives the cylinder to rotate so that the air dividing valve is located directly above the tire, and then the air dividing valve is opened, and the exhaust pipe extracts the gas in the suction cup through the exhaust hose, the air dividing valve and the connecting rod, so that the suction cup adsorbs the tire, and then the cylinder pushes the connecting plate upward to remove the tire from mold one, and the servo motor drives the cylinder to rotate in the opposite direction to reset, thereby taking out the tire.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the tire blank is placed in the lower mold mechanism, the upper mold mechanism descends to cooperate with the lower mold mechanism to heat and shape the tire blank, and at the same time, the air supply mechanism is started to supply air to the lower mold mechanism and the upper mold mechanism, so that the heating of the tire is more uniform. After the tire is formed, the upper mold mechanism rises, and the air supply mechanism uses wind force to accelerate the air flow, promote rapid cooling of the tire, and then the unloading mechanism takes out the tire, which improves work efficiency and saves workers the trouble of unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an axonometric structural diagram of the present utility model;

[0014] Figure 2 This is an axonometric structural diagram of the heat dissipation mechanism of the utility model;

[0015] Figure 3 It is a schematic diagram of the cross-sectional isometric structure of the lower mold mechanism and the upper mold mechanism of the utility model;

[0016] Figure 4 This is an axonometric structural diagram of the air supply mechanism of the utility model;

[0017] Figure 5 It is a partially enlarged sectional axonometric structural diagram of the air supply mechanism and the material discharge mechanism of the utility model.

[0018] Markings in the accompanying drawings: 01, heat dissipation mechanism; 11, workbench; 12, baffle; 13, top plate; 14, cooling fan; 02, lower mold mechanism; 21, motor; 22, reducer; 23, transmission shaft 1; 24, turntable; 25, heat insulation board 1; 26, electric heating wire 1; 27, mold 1; 03, upper mold mechanism; 31, hydraulic cylinder; 32, guide rod; 33, heat insulation board 2; 34, mold 2; 35, electric heating wire 2; 04, air supply mechanism; 41, transmission shaft 2; 42, air pump; 43, exhaust pipe; 44, air supply hose; 45, nozzle; 05, unloading mechanism; 51, bottom plate; 52, servo motor; 53, cylinder; 54, connecting plate; 55, air distribution valve; 56, connecting rod; 57, suction cup; 58, exhaust hose. DETAILED DESCRIPTION

[0019] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0020] Example 1

[0021] The utility model provides an aircraft tire shaping and heating mechanism, including a heat dissipation mechanism 01; a lower mold mechanism 02, an upper mold mechanism 03, an air supply mechanism 04 and a blanking mechanism 05. The lower mold mechanism 02 is mounted on the heat dissipation mechanism 01, and the upper mold mechanism 03 is mounted on the heat dissipation mechanism 01. The lower mold mechanism 02 and the upper mold mechanism 03 cooperate to perform shaping and heating on the aircraft tire. The air supply mechanism 04 is mounted on the lower mold mechanism 02, which not only makes the heating of the aircraft tire more uniform, but also allows the tire to be quickly cooled after being formed. The blanking mechanism 05 is mounted on the heat dissipation mechanism 01 and facilitates the removal of the tire from the mold, thereby improving work efficiency. ; The heat dissipation mechanism 01 includes a workbench 11, two groups of baffles 12, a top plate 13 and two groups of cooling fans 14. The bottom end of the workbench 11 is connected to the ground, and the bottom ends of the two groups of baffles 12 are connected to the top of the workbench 11. A heat dissipation groove is opened on the side wall of one group of baffles 12. The bottom end of the top plate 13 is connected to the top of the two groups of baffles 12. The two groups of cooling fans 14 are installed in the heat dissipation grooves of the baffles 12; the lower mold mechanism 02 includes a motor 21, a reducer 22, a transmission shaft 23, a turntable 24, a heat insulation plate 25, four groups of electric heating wires 26 and a mold 27. The motor 21 is installed on the workbench 11, and the reducer 22 is installed on the workbench 11 The drive shaft 23 is rotatably mounted on the workbench 11 and longitudinally connected to the reducer 22. The turntable 24 is rotatably mounted on the top of the workbench 11 and connected to the drive shaft 23 transmission tube. The bottom end of the heat insulation plate 25 is connected to the top of the workbench 11. Four groups of electric heating wires 26 are all mounted on the heat insulation plate 25. The mold 27 is mounted on the turntable 24. The upper mold mechanism 03 includes a hydraulic cylinder 31, four groups of guide rods 32, a heat insulation plate 23, a mold 24 and four groups of electric heating wires 235. The top end of the hydraulic cylinder 31 is connected to the bottom end of the top plate 13, the top end of the four groups of guide rods 32 are connected to the bottom end of the top plate 13, the top end of the heat insulation plate 23 is connected to the bottom end of the top plate 13, and the top end of the heat insulation plate 23 is connected to the bottom end of the top plate 13. It is connected to the bottom end of the four groups of guide rods 32 and the hydraulic cylinder 31, the mold 2 34 is installed in the heat insulation board 2 33, and the four groups of electric heating resistance wires 2 35 are all installed in the heat insulation board 2 33; the air supply mechanism 04 includes a transmission shaft 2 41, an air pump 42, an air extraction pipe 43, an air supply hose 44 and a nozzle 45, the transmission shaft 2 41 is rotatably mounted on the reducer 22, the air pump 42 is mounted on the workbench 11, the air extraction pipe 43 is mounted on the air pump 42, the air supply hose 44 is mounted on the air pump 42 and communicates with the interior of the heat insulation board 1 25 and the heat insulation board 2 33, the nozzle 45 is mounted on the baffle 12 and communicates with the interior of the air supply hose 44, and a valve is installed on the nozzle 45;In its work, first, the tire tire embryo is placed in the mold 27, start the hydraulic cylinder 31, the hydraulic cylinder 31 pushes the electric heating resistance wire 35 down, through the setting of four groups of guide rods 32 can make the electric heating resistance wire 35 vertical drop, prevent deviation, mold two 34 and mold 27 close, heat insulation plate two 33 and heat insulation plate 25 close, start the electric heating resistance wire two 35 to the mold two 34 heating, through the setting of four groups of electric heating resistance wire two 35 to the heating of the mold two 34 is more uniform, tire forming hydraulic cylinder 31 driven heat insulation plate two 33 and mold two 34 reset, start the electric heating resistance wire one 26, the electric heating resistance wire one 26 to the mold one 27 heating, so that the tire embryo forming, through the setting of four groups of electric heating resistance wire one 26 makes the heating of the tire embryo is more uniform, through the setting of heat insulation plate one 25 prevent heat loss, at the same time, the speed reducer 22 drive shaft two 41 rotation, transmission shaft two 41 rotation drive air pump 42 suction, air pump 42 through the suction pipe 43 into the outside air, then through the gas hose 44 to heat insulation plate one 25 and heat insulation plate two 33, make the heat insulation plate one 25 and heat insulation plate two 33 in the heat spread more evenly, when the tire forming, open the valve of the nozzle 45, nozzle 45 will be sprayed to the tire gas, accelerate the heat loss of the surface of the tire, start two groups of heat dissipation fan 14, accelerate the air flow of the surface of the tire, the surface temperature of the tire is reduced rapidly, improve the work efficiency.

[0022] Example 2

[0023] As Figures 1 to 5As shown, an aviation tire shaping and heating mechanism of the utility model is based on Example 1; the unloading mechanism 05 includes a base plate 51, a servo motor 52, a cylinder 53, a connecting plate 54, an air separator 55, three groups of connecting rods 56, three groups of suction cups 57 and an air extraction hose 58, the base plate 51 is installed on the workbench 11, the servo motor 52 is installed on the base plate 51, the cylinder 53 is installed on the workbench 11 and the bottom end of the cylinder 53 is transmission-connected to the servo motor 52, the top end of the cylinder 53 is slidably plugged into the workbench 11, the connecting plate 54 is installed on the cylinder 53, the air separator 55 is installed on the connecting plate 54, the three groups of connecting rods 56 are all installed on the air separator 55 and are connected to the inside of the air separator 55, and the three groups of suction cups 57 are respectively installed on the three groups of connecting rods 56 and is connected to the interior of the connecting rod 56, one end of the exhaust hose 58 is connected to the interior of the air distribution valve 55, and the other end of the exhaust hose 58 is connected to the interior of the exhaust pipe 43; when it is working, first, the tire blank is placed in the mold 1 27, and the hydraulic cylinder 31 is started. The hydraulic cylinder 31 pushes the electric heating wire 2 35 to descend. By setting four groups of guide rods 32, the electric heating wire 2 35 can be vertically lowered to prevent deviation. The mold 2 34 and the mold 1 27 are closed, the insulation board 2 33 and the insulation board 1 25 are closed, and the electric heating wire 2 35 is started to heat the mold 2 34. By setting four groups of electric heating wire 2 35, the heating of the mold 2 34 is more uniform. After the tire is formed, the hydraulic cylinder 31 drives the insulation board 2 33 and the mold 2 34 to reset, and the electric heating wire 1 is started. 26, the electric heating wire 26 heats the mold 27 to form the tire blank. By setting four groups of electric heating wires 26, the heating of the tire blank is made more uniform. By setting a heat insulation board 25 to prevent heat loss, the reducer 22 drives the transmission shaft 2 41 to rotate. The rotation of the transmission shaft 2 41 drives the air pump 42 to extract air. The air pump 42 sucks in the outside air through the exhaust pipe 43, and then delivers it to the heat insulation board 1 25 and the heat insulation board 2 33 through the air supply hose 44, so that the heat in the heat insulation board 25 and the heat insulation board 2 33 is distributed more evenly. When the tire is formed, the valve of the nozzle 45 is opened, and the nozzle 45 sprays gas onto the tire to accelerate the heat loss of the tire surface. The two groups of cooling fans 14 are started to accelerate the air flow on the tire surface and quickly reduce the temperature. The surface temperature of the tire is lowered to improve work efficiency. The servo motor 52 is started. The servo motor 52 drives the cylinder 53 to rotate so that the air separator valve 55 is located directly above the tire. The air separator valve 55 is then opened. The exhaust pipe 43 extracts the gas in the suction cup 57 through the exhaust hose 58, the air separator valve 55 and the connecting rod 56, so that the suction cup 57 adsorbs the tire. Then the motor 21 is started. The motor 21 drives the transmission shaft 23 to rotate through the reducer 22. The transmission shaft 23 drives the mold 27 to rotate through the turntable 24, so that the mold 27 and the tire are peeled off to prevent the tire from sticking to the mold. The cylinder 53 pushes the connecting plate 54 upward to remove the tire from the mold 27. The servo motor 52 drives the cylinder 53 to rotate in the opposite direction to reset, thereby removing the tire.

[0024] The electric motor 21, reducer 22, air pump 42 and servo motor 52 of the utility model are purchased on the market. Technicians in this industry only need to install and operate them according to the accompanying instruction manuals without the need for creative work by technicians in this field.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An aircraft tire shaping and heating mechanism, comprising a heat dissipation mechanism (01); characterized in that: The invention also comprises a lower mold mechanism (02), an upper mold mechanism (03), an air supply mechanism (04) and a blanking mechanism (05). The lower mold mechanism (02) is mounted on the heat dissipation mechanism (01), and the upper mold mechanism (03) is mounted on the heat dissipation mechanism (01). The lower mold mechanism (02) and the upper mold mechanism (03) cooperate to perform shaping and heating on the aircraft tire. The air supply mechanism (04) is mounted on the lower mold mechanism (02), which not only makes the heating of the aircraft tire more uniform, but also allows the tire to be quickly cooled after being formed. The blanking mechanism (05) is mounted on the heat dissipation mechanism (01) and facilitates the tire to be taken out of the mold, thereby improving work efficiency.

2. The aircraft tire shaping and heating mechanism according to claim 1, characterized in that: The heat dissipation mechanism (01) comprises a workbench (11), two groups of baffles (12), a top plate (13) and two groups of heat dissipation fans (14). The bottom end of the workbench (11) is connected to the ground, the bottom ends of the two groups of baffles (12) are connected to the top end of the workbench (11), a heat dissipation groove is opened on the side wall of one group of baffles (12), the bottom end of the top plate (13) is connected to the top ends of the two groups of baffles (12), and the two groups of heat dissipation fans (14) are both installed in the heat dissipation grooves of the baffles (12).

3. The aircraft tire shaping and heating mechanism according to claim 2, characterized in that: The lower mold mechanism (02) comprises a motor (21), a reducer (22), a transmission shaft (23), a turntable (24), a heat insulation board (25), four groups of electric heat resistance wires (26) and a mold (27). The motor (21) is mounted on a workbench (11), the reducer (22) is mounted on the workbench (11), the transmission shaft (23) is rotatably mounted on the workbench (11) and is longitudinally connected to the reducer (22), the turntable (24) is rotatably mounted on the top of the workbench (11) and is connected to the transmission pipe of the transmission shaft (23), the bottom end of the heat insulation board (25) is connected to the top of the workbench (11), the four groups of electric heat resistance wires (26) are all mounted on the heat insulation board (25), and the mold (27) is mounted on the turntable (24).

4. The aircraft tire shaping and heating mechanism according to claim 2, characterized in that: The upper mold mechanism (03) comprises a hydraulic cylinder (31), four groups of guide rods (32), a second heat insulation board (33), a second mold (34) and four groups of electric heat resistance wires (35). The top end of the hydraulic cylinder (31) is connected to the bottom end of the top plate (13), the top end of the four groups of guide rods (32) is connected to the bottom end of the top plate (13), the top end of the second heat insulation board (33) is connected to the four groups of guide rods (32) and the bottom end of the hydraulic cylinder (31), the second mold (34) is installed in the second heat insulation board (33), and the four groups of electric heat resistance wires (35) are all installed in the second heat insulation board (33).

5. The aircraft tire shaping and heating mechanism according to claim 4, characterized in that: The air supply mechanism (04) includes a second transmission shaft (41), an air pump (42), an air extraction pipe (43), an air supply hose (44) and a nozzle (45). The second transmission shaft (41) is rotatably mounted on the reducer (22). The air pump (42) is mounted on the workbench (11). The air extraction pipe (43) is mounted on the air pump (42). The air supply hose (44) is mounted on the air pump (42) and communicates with the interior of the first heat insulation board (25) and the second heat insulation board (33). The nozzle (45) is mounted on the baffle (12) and communicates with the interior of the air supply hose (44). A valve is mounted on the nozzle (45).

6. The aircraft tire shaping and heating mechanism according to claim 5, characterized in that: The unloading mechanism (05) comprises a base plate (51), a servo motor (52), a cylinder (53), a connecting plate (54), an air valve (55), three groups of connecting rods (56), three groups of suction cups (57) and an air extraction hose (58). The base plate (51) is mounted on the workbench (11), the servo motor (52) is mounted on the base plate (51), the cylinder (53) is mounted on the workbench (11) and the bottom end of the cylinder (53) is connected to the servo motor (52) by transmission, and the top end of the cylinder (53) is inserted into the workbench (11) by sliding. The connecting plate (54) is connected to the workbench (11), the connecting plate (54) is installed on the cylinder (53), the air distribution valve (55) is installed on the connecting plate (54), the three groups of connecting rods (56) are installed on the air distribution valve (55) and are communicated with the inside of the air distribution valve (55), the three groups of suction cups (57) are respectively installed on the three groups of connecting rods (56) and are communicated with the inside of the connecting rods (56), one end of the air extraction hose (58) is communicated with the inside of the air distribution valve (55), and the other end of the air extraction hose (58) is communicated with the inside of the air extraction pipe (43).

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