Cold and hot pressing forming machine for carbon fiber shell

Abstract

The invention belongs to the technical field of carbon fiber shell hot pressing forming, and discloses a carbon fiber shell cold and hot pressing forming machine which comprises a hot pressing area and a cold pressing area and further comprises a channel arranged in the middle area of the hot pressing area and the cold pressing area and used for communicating the hot pressing area with the cold pressing area. The moving module is mounted in the channel; the shaking piece is arranged on the inclined surface of the inner cavity of the channel; the channel comprises a shell of which the two ends are respectively mounted with the hot pressing area and the cold pressing area; through the cooperation of structures such as a moving module and a rubber air outlet pipe, a corrugated pipe air outlet pipe is synchronously compressed, air in the corrugated pipe air outlet pipe can enter a first air cavity through an air channel and a first connecting pipe, and air blowing is conducted on the lower portion of a mold provided with a carbon fiber shell through the first air cavity; and therefore, the pre-cooling effect on the mold provided with the carbon fiber shell in the process from the hot pressing area to the cold pressing area is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hot pressing forming of carbon fiber shells, in particular to a cold and hot pressing forming machine for a carbon fiber shell. Background Art

[0002] The carbon fiber shell hot and cold pressing machine is a device that combines carbon fiber prepreg or carbon fiber cloth with composite materials such as resin matrix through high temperature and high pressure or low temperature and high pressure processes, and then forms a carbon fiber shell with high strength and lightweight characteristics through compression molding.

[0003] However, in the process of switching from hot pressing to cold pressing, the existing carbon fiber shell hot and cold pressing molding machine needs to wait for the product to cool to a certain temperature before taking it out after the hot pressing is completed. After taking it out, the product is placed in the cold pressing area for cooling. During the conversion and transportation of high-temperature products to the cold pressing area, if they are taken out directly, it may cause burns to the operator and it is also very easy for impurities to stick. Therefore, it needs to be improved. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a carbon fiber shell cold and hot pressing molding machine.

[0005] To achieve the above object, the present invention provides the following technical solution: a carbon fiber shell hot and cold pressing molding machine, comprising a hot pressing zone and a cold pressing zone, and also comprising: A channel is provided in the middle area between the hot pressing zone and the cold pressing zone, and is used to connect the hot pressing zone and the cold pressing zone; A mobile module, wherein the mobile module is installed inside the channel; A shaking member, which is arranged on the inclined surface of the inner cavity of the channel; The channel comprises a shell having two ends respectively mounted on the hot pressing zone and the cold pressing zone, an air channel is provided at the upper end of the inner cavity of the shell, and a plurality of first air outlet grooves are provided at equal distances on both sides of the shell; The movable module comprises a movable plate installed in the inner cavity of the shell, both ends of the movable plate penetrate the shell and abut against a movable component arranged on the shell, and a bellows air outlet pipe is installed on one side of the movable plate; the movable component comprises a movable plate, and a first air cavity communicating with the airway is opened inside the movable plate; The shaking member includes a bearing connected to a shell, which is in the form of a plurality of spheres arranged equidistantly and of different sizes. The inner cavity of the sphere is provided with three air holes in different directions, and the shell is connected to the inner cavity of the sphere through a second air cavity.

[0006] Preferably, the inner cavity of the hot pressing zone is movably connected with a supporting member, and the supporting member can transport the carbon fiber shell inside the hot pressing zone and the channel through a hydraulic driving member.

[0007] Preferably, the supporting member comprises a supporting plate and a movable rod placed below the hot pressing area of ​​the hot pressing zone, and there is a gap between the supporting plate and the top surface of the lower end of the inner cavity of the hot pressing zone; An arc groove is provided inside the lower end of the support plate, a support seat is hinged in the arc groove, L-shaped rods are installed on both sides of the support seat, and the movable rods are arranged on both sides of the moving module and connected to the inner cavity bearing of the shell.

[0008] Preferably, a mold for pressing the carbon fiber shell and a carbon fiber shell material placed inside the mold are placed on the top of the supporting plate.

[0009] Preferably, both sides of the shift plate located inside the shell are elastically connected to the shell through a first spring, and the contacting ends of the shift plate and the movable plate are provided with an oblique angle.

[0010] Preferably, the inner cavity of the shell is provided with a transverse groove for allowing the movable plate to move laterally, and one end of the movable plate is arranged in the transverse groove; The movable plate is elastically connected to the housing through a second spring, and the top of the movable plate is communicated with the airway through a first connecting pipe.

[0011] Preferably, the facing ends of the two movable plates and the contact ends with the supporting member are both inclined, and the bottom surface of the movable plate is provided with an inclined rectangular groove for discharging the gas inside the first air cavity; The bottom surface of the movable plate is located just on the top surface of the supporting plate.

[0012] Preferably, the second air cavity is communicated with the bellows air outlet pipe, an impurity discharge trough is provided at one end of the shell away from the second air cavity, and four groups of staggered inclined plates are arranged in the trough.

[0013] Preferably, the second air cavity is connected to the inclined plate through a second connecting pipe, and a second air outlet groove is formed at one end of the inclined plate away from the second connecting pipe, and the second air outlet groove is obliquely disposed on the inclined surface of the inclined plate.

[0014] Preferably, a plurality of rubber air outlet pipes are installed on the top of the inner cavity of the shell, and the rubber air outlet pipes are communicated with the airway.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention cooperates with structures such as a movable module and a rubber air outlet pipe, and the bellows air outlet pipe is compressed synchronously. The internal gas thereof enters the interior of the first air cavity through the airway and the first connecting pipe, and blows the gas to the bottom of the mold equipped with the carbon fiber shell through the first air cavity. At the same time, part of the gas inside the airway enters the interior of the rubber air outlet pipe, and is blown back and forth in a swinging manner above the mold equipped with the carbon fiber shell through the rubber air outlet pipe, thereby improving the flow effect of the internal airflow, and further improving the effect of pre-cooling the mold equipped with the carbon fiber shell in the process from the hot pressing zone to the cold pressing zone.

[0016] The present invention cooperates with structures such as a sphere and a second air cavity. During the sliding process, the second air cavity is filled with airway gas, and the air pressure drives the sphere to rotate. The spheres of different sizes will slightly shake the sliding mold with a carbon fiber shell. At the same time, part of the gas passes through the rotation of the sphere and uses the air holes to blow the mold with a carbon fiber shell on the top surface of the sphere. The sliding shaking prevents external impurities from being contaminated on the mold and improves the cooling power.

[0017] The present invention cooperates with structures such as channels and hydraulic drive components, and there is no need to manually take out the products in the hot pressing zone for transportation. It only requires starting the hydraulic drive component to drive the supporting component to transport the mold equipped with the carbon fiber shell directly to the inside of the channel. Subsequently, it only requires manual assistance to adjust the position of the mold equipped with the carbon fiber shell on the cold pressing zone, which reduces the safety hazards of manual operations and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the structural matching relationship between the housing and the airway of the present invention; Figure 3 It is a schematic diagram of the structural matching relationship between the support plate and the L-shaped rod of the present invention; Figure 4 for Figure 3 A schematic diagram of the partially enlarged structure at center A; Figure 5 for Figure 3 A schematic diagram of the partially enlarged structure at B in the middle; Figure 6 It is a schematic diagram of the subdivision structure of the mobile module of the present invention; Figure 7 for Figure 6 A schematic diagram of the partially enlarged structure at C in the middle; Figure 8 It is a schematic diagram of the structural coordination relationship between the air duct and the movable plate of the present invention; Fig. 9 for Figure 8 The schematic diagram of the local enlarged structure at D in the middle; Fig.10 It is a schematic diagram of the structural matching relationship between the housing and the first air outlet groove of the present invention; Fig.11 It is a schematic diagram of the structural coordination relationship between the airway and the rubber air outlet pipe of the present invention; Fig.12 It is a schematic diagram of the structural coordination relationship between the air hole and the second air cavity of the present invention; Fig.13 for Fig.12 The schematic diagram of the local enlarged structure at E in the middle; Fig.14 for Fig.13 Schematic diagram of the partially enlarged structure at point F in the middle.

[0019] In the figure: 1. hot pressing zone; 2. cold pressing zone; 3. channel; 31. shell; 32. first air outlet groove; 33. air duct; 4. supporting member; 41. supporting plate; 42. supporting seat; 43. L-shaped rod; 44. movable rod; 5. hydraulic drive member; 6. movable module; 61. movable plate; 62. bellows air outlet pipe; 63. first spring; 64. movable assembly; 641. movable plate; 642. second spring; 643. first air cavity; 644. first connecting pipe; 7. shaking member; 71. sphere; 72. air hole; 73. second air cavity; 74. second connecting pipe; 75. inclined plate; 76. second air outlet groove; 8. rubber air outlet pipe. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figures 1 to 14 As shown, the present invention provides a carbon fiber shell hot and cold pressing molding machine, including a hot pressing zone 1 and a cold pressing zone 2, and also includes: A channel 3 is provided in the middle area between the hot pressing zone 1 and the cold pressing zone 2, and is used to connect the hot pressing zone 1 and the cold pressing zone 2; A mobile module 6, which is installed inside the channel 3; A shaking member 7, which is arranged on the inclined surface of the inner cavity of the channel 3; The channel 3 comprises a shell 31 with two ends respectively mounted on the hot pressing zone 1 and the cold pressing zone 2, an air channel 33 is provided at the upper end of the inner cavity of the shell 31, and a plurality of first air outlet grooves 32 are provided at equal distances on both sides of the shell 31; The movable module 6 includes a movable plate 61 installed in the inner cavity of the housing 31. Both ends of the movable plate 61 penetrate the housing 31 and abut against a movable assembly 64 arranged on the housing 31. A bellows air outlet pipe 62 is installed on one side of the movable plate 61. The movable assembly 64 includes a movable plate 641. A first air cavity 643 communicating with the airway 33 is opened inside the movable plate 641. The shaking member 7 includes a bearing connected to the shell 31, and is in the form of a plurality of equidistantly arranged spheres 71 of different sizes. The inner cavity of the sphere 71 is provided with three air holes 72 in different directions. The shell 31 is connected to the inner cavity of the sphere 71 through a second air cavity 73.

[0022] like Figure 1 and Figure 2 As shown, the inner cavity of the hot pressing zone 1 is movably connected with a supporting member 4, and the supporting member 4 can transport the carbon fiber shell inside the hot pressing zone 1 and the channel 3 through a hydraulic driving member 5.

[0023] like Figure 3 and Figure 4 As shown, the supporting member 4 includes a supporting plate 41 and a movable rod 44 placed below the hot pressing area of ​​the hot pressing zone 1, and there is a gap between the supporting plate 41 and the top surface of the lower end of the inner cavity of the hot pressing zone 1; An arc groove is formed inside the lower end of the support plate 41 , in which a support seat 42 is hinged. L-shaped rods 43 are installed on both sides of the support seat 42 . Movable rods 44 are arranged on both sides of the movable module 6 and connected to the inner cavity bearing of the shell 31 .

[0024] The above scheme is adopted: when the hydraulic drive component 5 pulls the support plate 41, the support seat 42 and the L-shaped rod 43 to move together and makes the L-shaped rod 43 contact with the movable rod 44, the higher end of the L-shaped rod 43 will gradually resist the movable rod 44, so that the movable rod 44 gradually becomes a vertical state, and the top of the movable rod 44 will gradually resist the support plate 41 to make it slightly flipped on the top surface of the support seat 42. Since the height of the support plate 41 is slightly higher than the height of the top surface of the inner cavity of the hot pressing zone 1 and the cold pressing zone 2, the carbon fiber shell and its mold located on the top of the support plate 41 are tilted, and then they can slide down smoothly. In the initial state, the bottom end of the movable rod 44 abuts against a baffle that restricts its movement, and the gear lever is installed on the shell 31, so that the movable rod 44 is initially tilted, but the tilt height will not affect the movement of the support plate 41 above it.

[0025] like Figure 3 As shown, a mold for pressing the carbon fiber shell and a carbon fiber shell material placed inside the mold are placed on the top of the supporting plate 41 .

[0026] like Figure 6As shown, both sides of the shift plate 61 inside the housing 31 are elastically connected to the housing 31 through the first spring 63 , and the contacting ends of the shift plate 61 and the movable plate 641 are provided with an oblique angle.

[0027] With the above solution, the beveled ends of the moving plate 61 are formed so that when the moving plate 61 is gradually abutted by the support seat 42 , the beveled ends thereof will gradually abut the movable plate 641 , so that the two movable plates 641 move toward each other inside the housing 31 .

[0028] like Figure 6 and Fig. 9 As shown, the inner cavity of the housing 31 is provided with a transverse groove for allowing the movable plate 641 to move laterally, and one end of the movable plate 641 is disposed in the transverse groove; The movable plate 641 is elastically connected to the housing 31 via the second spring 642 , and the top of the movable plate 641 is connected to the air passage 33 via the first connecting pipe 644 .

[0029] By adopting the above solution, the second spring 642 provides a subsequent stable limiting effect for the movable plate 641 , and at the same time, the gas inside the airway 33 enters the first air cavity 643 through the first connecting pipe 644 , and is discharged to the bottom of the movable plate 641 through the first air cavity 643 .

[0030] like Figure 6 , Figure 8 and Fig. 9 As shown, the facing ends of the two movable plates 641 and the contact ends with the supporting member 4 are both inclined, and the bottom surface of the movable plate 641 is provided with an inclined rectangular groove for exhausting the gas inside the first air cavity 643; The bottom surface of the movable plate 641 is located on the top surface of the supporting plate 41 .

[0031] The above scheme is adopted: the end face of the movable plate 641 is set in an inclined shape, so that when the two movable plates 641 move toward each other, one end of the inclined surface will move smoothly along the middle gap between the bottom surface of the mold with the carbon fiber shell and the top surface of the support plate 41, and then the mold with the carbon fiber shell located above the support plate 41 will be slightly moved upward and lifted. The mold with the carbon fiber shell will not fit the top surface of the support plate 41. At the same time, through the connection between the first connecting tube 644 and the first air cavity 643, part of the gas is blown from the bottom surface of the first air cavity 643 to the bottom of the mold.

[0032] like Figure 12 to Figure 14 As shown, the second air cavity 73 is communicated with the bellows air outlet pipe 62, and an impurity discharge trough is provided at one end of the shell 31 away from the second air cavity 73, and four groups of staggered inclined plates 75 are arranged in the trough.

[0033] like Fig.13As shown, the second air cavity 73 is connected to the inclined plate 75 through the second connecting pipe 74 . A second air outlet groove 76 is formed at one end of the inclined plate 75 away from the second connecting pipe 74 . The second air outlet groove 76 is obliquely disposed on the inclined surface of the inclined plate 75 .

[0034] The above scheme is adopted: when the gas inside the bellows air outlet pipe 62 enters the second air cavity 73, the sphere 71 rotates on the shell 31 under the resistance of air pressure, and when one side of the air hole 72 is located inside the second air cavity 73 and the other side is located in the inner cavity of the shell 31, the gas inside the second air cavity 73 will blow the bottom of the mold with a carbon fiber shell located above the sphere 71 through the air hole 72. At the same time, the spheres 71 of different sizes will cause the mold with a carbon fiber shell to slide down above the sphere 71, causing slight shaking; at the same time, the gas discharged downward from the second connecting pipe 74 through the inclined plate 75 and the second air outlet groove 76 will blow the inclined surface of the inclined plate 75, thereby accelerating the downward flow speed of impurities in the impurity discharge trough. At the same time, the arrangement of multiple inclined plates 75 slows down the speed of external air flowing from the trough to the inside of the shell 31.

[0035] like Figure 2 and Figure 3 As shown, a plurality of rubber air outlet pipes 8 are installed at the top of the inner cavity of the shell 31 , and the rubber air outlet pipes 8 are connected to the air passage 33 .

[0036] The above scheme is adopted: the appearance of the first air outlet groove 32 is "narrow outside and wide inside", which reduces the possibility of external impurities entering the inner cavity of the shell 31 through the first air outlet groove 32. When the inside of the rubber air outlet pipe 8 is filled with the internal gas of the airway 33, the increase in air pressure will cause the lower end of the rubber air outlet pipe 8 to swing back and forth. At this time, the gas will also be discharged in a swinging manner, thereby increasing the flow rate of the airflow.

[0037] The working principle and use process of the present invention: First, the blocking door on the hot pressing area 1 is opened by the hydraulic device, and the hydraulic driving member 5 is driven to drive the supporting member 4 to move as a whole toward the inside of the channel 3. When the supporting seat 42 enters the inside of the shell 31, it will push the moving plate 61 to move synchronously, and the beveled end of the moving plate 61 will gradually contact the movable plate 641, so that the two movable plates 641 move toward each other inside the shell 31. The inclined surfaces of the two movable plates 641 will move from the bottom surface of the mold with the carbon fiber shell and the middle gap of the top surface of the supporting plate 41, thereby making the mold with the carbon fiber shell not fit the top surface of the supporting plate 41. Subsequently, the bellows air outlet pipe 62 will be compressed synchronously, and the gas inside it will enter the first air cavity 643 through the air channel 33 and the first connecting pipe 644, and the gas will be discharged to the bottom of the mold equipped with the carbon fiber shell through the first air cavity 643, so as to improve the cooling effect of the mold equipped with the carbon fiber shell; At the same time, part of the gas inside the air channel 33 will enter the rubber outlet pipe 8, and will be blown back and forth in a swinging manner above the mold equipped with the carbon fiber shell through the rubber outlet pipe 8, so as to improve the flow effect of the internal airflow; Finally, when the support seat 42 moves, the L-shaped rod 43 will contact the movable rod 44, so that the movable rod 44 gradually presents a vertical state, and the top end thereof contacts one side of the bottom surface of the support plate 41, so that the support plate 41 is slightly turned over, and a thrust is applied to the mold with the carbon fiber shell, so that the mold with the carbon fiber shell can slide down through the inclined surface at one end of the inner cavity of the shell 31. During the sliding process, the second air cavity 73 is filled with gas from the air channel 33, and the air pressure will push the sphere 71 to rotate. The spheres 71 of different sizes will slightly shake the sliding mold with the carbon fiber shell. At the same time, part of the gas will pass through the rotation of the sphere 71, and the air hole 72 will be used to blow the mold with the carbon fiber shell on the top surface of the sphere 71. When the mold with the carbon fiber shell slides down into the inner cavity of the cold pressing zone 2, the position of the mold in the cold pressing zone 2 can be manually adjusted through the hinged door on the outside to carry out subsequent cold pressing operations.

[0038] It should be noted that the interiors of the hot pressing zone 1 and the cold pressing zone 2 both adopt the existing hot and cold pressing methods, and the connecting ends of the hot pressing zone 1 and the cold pressing zone 2 and the channel 3 are provided with hydraulic devices, which are used to drive the blocking door to move up and down to achieve a one-side sealing effect; at the same time, after the hot pressing is completed, the product is first left to stand for a period of time before operating this equipment, instead of directly operating after the hot pressing is completed.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A carbon fiber shell hot and cold pressing molding machine, comprising a hot pressing zone (1) and a cold pressing zone (2), characterized in that: Also includes: A channel (3) is arranged in the middle area between the hot pressing zone (1) and the cold pressing zone (2) and is used to connect the hot pressing zone (1) and the cold pressing zone (2); A movable module (6), wherein the movable module (6) is installed inside the channel (3); A shaking member (7) disposed on the inclined surface of the inner cavity of the channel (3); The channel (3) comprises a shell (31) whose two ends are respectively mounted on the hot pressing zone (1) and the cold pressing zone (2), an air channel (33) is provided at the upper end of the inner cavity of the shell (31), and a plurality of first air outlet grooves (32) are provided at equal distances on both sides of the shell (31); The movable module (6) comprises a movable plate (61) installed in the inner cavity of the shell (31); both ends of the movable plate (61) penetrate the shell (31) and abut against a movable component (64) arranged on the shell (31); a bellows air outlet pipe (62) is installed on one side of the movable plate (61); the movable component (64) comprises a movable plate (641); a first air cavity (643) communicating with the air passage (33) is provided inside the movable plate (641); The shaking member (7) comprises a bearing connected to a housing (31), and is in the form of a plurality of spheres (71) arranged at equal distances and of different sizes; the inner cavity of the sphere (71) is provided with three air holes (72) facing in different directions; and the housing (31) is connected to the inner cavity of the sphere (71) via a second air cavity (73).

2. The carbon fiber shell cold and hot pressing molding machine according to claim 1, characterized in that: The inner cavity of the hot pressing zone (1) is movably connected to a supporting member (4), and the supporting member (4) can transport the carbon fiber shell inside the hot pressing zone (1) and the channel (3) through a hydraulic drive member (5).

3. The carbon fiber shell cold and hot pressing molding machine according to claim 2, characterized in that: The support member (4) comprises a support plate (41) and a movable rod (44) placed below the hot pressing area of ​​the hot pressing zone (1), and a gap exists between the support plate (41) and the top surface of the lower end of the inner cavity of the hot pressing zone (1); An arc groove is formed inside the lower end of the support plate (41), a support seat (42) is hinged in the arc groove, L-shaped rods (43) are installed on both sides of the support seat (42), and the movable rods (44) are arranged on both sides of the movable module (6) and connected to the inner cavity bearing of the shell (31).

4. The carbon fiber shell cold and hot pressing molding machine according to claim 3, characterized in that: A mold for pressing the carbon fiber shell and a carbon fiber shell material placed inside the mold are placed on the top of the support plate (41).

5. The carbon fiber shell cold and hot pressing molding machine according to claim 1, characterized in that: Both sides of the shift plate (61) located inside the housing (31) are elastically connected to the housing (31) via first springs (63), and the contacting ends of the shift plate (61) and the movable plate (641) are provided with an oblique angle.

6. The carbon fiber shell cold and hot pressing molding machine according to claim 5, characterized in that: The inner cavity of the housing (31) is provided with a transverse groove for allowing the movable plate (641) to move laterally, and one end of the movable plate (641) is arranged in the transverse groove; The movable plate (641) is elastically connected to the housing (31) via a second spring (642), and the top of the movable plate (641) is connected to the airway (33) via a first connecting pipe (644).

7. The carbon fiber shell cold and hot pressing molding machine according to claim 6, characterized in that: The facing ends of the two movable plates (641) and the contact ends with the supporting member (4) are both in the shape of inclined surfaces, and the bottom surface of the movable plate (641) is provided with an inclined rectangular groove for discharging the gas inside the first air cavity (643); The bottom surface of the movable plate (641) is located directly on the top surface of the supporting plate (41).

8. The carbon fiber shell cold and hot pressing molding machine according to claim 1, characterized in that: The second air cavity (73) is in communication with the bellows air outlet pipe (62); an impurity discharge trough is provided at one end of the housing (31) away from the second air cavity (73), and four groups of staggered inclined plates (75) are arranged in the trough.

9. The carbon fiber shell cold and hot pressing molding machine according to claim 8, characterized in that: The second air cavity (73) is connected to the inclined plate (75) via a second connecting pipe (74); a second air outlet groove (76) is provided at one end of the inclined plate (75) away from the second connecting pipe (74); the second air outlet groove (76) is arranged in an oblique shape and directly opposite to the inclined surface of the inclined plate (75).

10. The carbon fiber shell cold and hot pressing molding machine according to claim 1, characterized in that: A plurality of rubber air outlet pipes (8) are installed at the top of the inner cavity of the shell (31), and the rubber air outlet pipes (8) are in communication with the air passage (33).

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