Hovercraft

Abstract

The invention relates to a hovercraft and relates to the technical field of ships, the hovercraft comprises a hull body, a first pneumatic assembly, a second pneumatic assembly and a third driving assembly, an air bag is arranged on the bottom end face of the hull body, the first pneumatic assembly is arranged on the inner side of the air bag, and the second pneumatic assembly is arranged on one side of the first pneumatic assembly; a third driving assembly is mounted on the upper end face of the hull body, a limiting mounting hole is formed in the upper end face of the hull body, the hull body is connected with the third driving assembly through the limiting mounting hole, a deck is arranged on the upper end face of the hull body, a rubber belt is arranged around the air bag, and the air bag communicates with an inflator. The gas spraying pipe is arranged in water and sprays gas, water is pushed through gas, a water body is used for providing counter-acting force, the ship is made to advance, the gas spraying pipe is arranged in water, the flow of air needed by advancing of the ship is smaller, the generated gas can be more efficiently utilized, the ship is made to advance, and pushing of the ship is achieved.

Description

Technical Field

[0001] The present application relates to the field of ship technology, in particular to a hovercraft. Background Art

[0002] A hovercraft is a ship that uses the support of air to lift off the water surface. As soon as this type of ship appeared, it immediately attracted the attention of the shipbuilding industry around the world. The hovercraft uses the high-pressure air cushion between the bottom of the ship and the water surface to partially or completely lift the hull to achieve fast sailing. The high-pressure air cushion is formed by pressing air into the bottom of the ship, and a flexible skirt around the bottom of the ship limits the escape of air, so that the hull is lifted by air pressure; In the prior art, hovercraft are provided with two groups of pneumatic elements, one group of pneumatic elements generates a vertical downward lifting force to form an air layer to separate the hull from the water surface or land, and the other group of pneumatic elements generates a propulsion force. When the rearward fan is used, the hull moves forward, thereby realizing the movement of the hovercraft. However, the movement of the hovercraft requires a separate rearward fan, which affects the accommodation space of the deck of the hovercraft. When the nozzle is directly set in the air for propulsion, it can only rely on the backward thrust but cannot be subjected to the forward reaction force. Summary of the invention

[0003] The object of the present application is to provide a hovercraft.

[0004] The hovercraft provided in this application adopts the following technical solution: The hovercraft comprises a hull body, a first pneumatic assembly, a second pneumatic assembly and a third driving assembly, wherein an airbag is arranged on the bottom end surface of the hull body, and the first pneumatic assembly is arranged on the inner side of the airbag, a second pneumatic assembly is arranged on one side of the first pneumatic assembly, and a third driving assembly is installed on the upper end surface of the hull body, the second pneumatic assembly comprises a limit mounting plate and a second pneumatic mechanism, the limit mounting plate is installed on the bottom end surface of the hull body, and the second pneumatic mechanism is arranged on the bottom end surface of the limit mounting plate, the second pneumatic mechanism comprises a servo rotating disk and a first fixed block, the servo rotating disk The servo rotating disk is installed on the bottom end surface of the limit mounting plate, and the first fixed block is installed on the bottom end surface of the servo rotating disk, the second fixed block is installed on the bottom end surface of the first fixed block, the side end surface of the second fixed block is connected with the air injection pipe through a bearing, the first fixed block and the side end surface of the air injection pipe are provided with a servo telescopic rod, and the two ends of the servo telescopic rod are respectively connected with the first fixed block and the two sides of the air injection pipe through a bearing seat, and the contact surface of the bearing seat and the first fixed block and the air injection pipe is provided with a bearing, a one-way valve is provided at one end of the air injection pipe away from the second fixed block, and the bottom end surface of the air injection pipe is connected with a connecting head.

[0005] By adopting the above technical solution, the jet pipe is placed in the water and jets are emitted, the gas pushes the water, and the water body is used to provide a reaction force, thereby making the ship move forward. Moreover, since the jet pipe is placed in the water, the air flow required for the ship to move forward is less, and the generated gas can be used more efficiently, thereby making the ship move forward and achieving the propulsion of the ship.

[0006] The first pneumatic component includes a blower and an air duct. The output end of the blower is provided with an air duct cover, and the air duct cover is connected to the air duct. The bottom end surface of the air duct is connected to the air outlet.

[0007] By adopting the above technical solution, buoyancy is generated through the blower, air duct, air guide cover and air outlet, thereby separating the hull body from the water surface or land, thereby forming an air layer, thereby facilitating the movement of the hull body.

[0008] The upper end surface of the hull body is provided with a limit mounting hole, and the hull body is connected to a third driving component through the limit mounting hole, the upper end surface of the hull body is provided with a deck, a rubber belt is provided around the airbag, and the airbag is connected to an inflator.

[0009] By adopting the above technical solution, a limited position mounting hole is provided, thereby facilitating the limited position connection between the hull body and the third driving assembly, so that the third driving assembly can push the hull body to move.

[0010] The third driving assembly is composed of a limiting frame, a pushing fan and a rotating disk, wherein the pushing fan is installed on the inner side of the limiting frame, and the contact surface between the limiting frame and the limiting mounting hole is provided with a rotating disk.

[0011] By adopting the above technical solution, the propulsion fan is limited by a limiting frame and a rotating disk, wherein the propulsion fan generates thrust, thereby realizing the movement of the hull body, and the direction of the thrust generated by the propulsion fan is changed by the rotating disk, thereby realizing the movement of the hull body.

[0012] The first fixed block forms a rotating structure rotating around the center of the servo rotating disk through the servo rotating disk and the limiting mounting plate, and the second fixed block forms a rotating structure rotating around the center of the bearing through the bearing and the air injection pipe.

[0013] By adopting the above technical solution, the rotation angle and direction of the jet pipe are adjusted by the servo rotating disk, the first fixed block and the second fixed block, thereby facilitating the movement of the hull body to the corresponding orientation, and by controlling the angle and direction of the jet pipe placed in the water, thereby facilitating the movement of the hull body.

[0014] The servo telescopic rod forms a rotating structure rotating around the center of the bearing through the bearing seat and the bearing, the first fixed block and the air injection pipe, and the one-way valve forms a connecting structure with the connecting head through the air injection pipe.

[0015] By adopting the above technical solution, the servo telescopic rod, the bearing seat and the bearing are used to control the angle adjustment of the jet pipe, thereby changing the angle of the jet pipe placed in the water, and a one-way valve is provided at one end of the jet pipe to prevent water backflow, thereby facilitating the movement of the hull body.

[0016] The output end of the blower forms a communication structure with the air guide cover, the blower forms a communication structure with the air guide pipe through the air guide cover, and the air guide pipe forms a communication structure with the air outlet.

[0017] By adopting the above technical solution, the blower is started to generate gas, and the gas flows into the air duct through the wind guide cover, and then the gas is ejected from the air outlet, thereby achieving vertical upward thrust, thereby achieving buoyancy of the hull body, increasing the buoyancy of the hull body, and forming a layer of air to facilitate the movement of the hull body.

[0018] The hull body is connected with the third driving assembly through the limiting mounting hole, and the third driving assembly forms a rotating structure rotating around the center of the rotating disk with the hull body through the rotating disk.

[0019] By adopting the above technical solution, the third driving component is limitedly connected through the limiting mounting hole, and the direction of the thrust generated by the fan is changed by the rotating disk, thereby facilitating the generation of thrust for moving the hull body and changing the direction of the thrust.

[0020] The rubber belts are provided in several groups, and the groups of rubber belts are arranged on the outer surface of the airbag, the output end of the inflator forms a connecting structure with the airbag, the first pneumatic component and the second pneumatic component are each provided in two groups, and the two groups of the first pneumatic component and the second pneumatic component are arranged symmetrically.

[0021] By adopting the above technical solution, several groups of rubber belts are arranged around the airbag to prevent the airbag from being damaged, and the inflator is connected to the airbag, so that it is convenient to inflate the airbag through the inflator, which is beneficial to the automatic inflation of the airbag, and since two groups of first pneumatic components and second pneumatic components are provided, it is convenient for the first pneumatic components and the second pneumatic components to generate buoyancy and generate thrust in the water.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. The jet pipe is placed in the water and sprays air, and the gas pushes the water, and the water body is used to give a reaction force, so that the ship moves forward. Since the jet pipe is placed in the water, the air flow required for the ship to move forward is less, and the generated gas can be used more efficiently to make the ship move forward, thereby realizing the propulsion of the ship. The propulsion fan is limited by a limit frame and a rotating disk, and the propulsion fan generates thrust to realize the movement of the hull body, and the direction of the thrust generated by the propulsion fan is changed by the rotating disk to realize the movement of the hull body; 2. The blower is started to generate gas, and the gas flows into the air duct through the air guide cover, so that the gas is ejected from the air outlet to achieve vertical upward thrust, thereby achieving buoyancy of the hull body, increasing the buoyancy of the hull body, and forming an air layer to facilitate the movement of the hull body. Buoyancy is generated by the blower, the air duct, the air guide cover and the air outlet to separate the hull body from the water surface or land, thereby forming an air layer to facilitate the movement of the hull body. The rotation angle and direction of the jet pipe are adjusted by the servo rotating disk, the first fixed block and the second fixed block to facilitate the movement of the hull body to the corresponding orientation. The angle and direction of the jet pipe placed in the water are controlled to facilitate the movement of the hull body. The servo telescopic rod, the bearing seat and the bearing are used to control the angle adjustment of the jet pipe to change the angle of the jet pipe placed in the water. A one-way valve is provided at one end of the jet pipe to prevent water backflow, thereby facilitating the movement of the hull body. 3. A limit mounting hole is provided, which is convenient for the limit connection between the hull body and the third driving component, so that the third driving component can push the hull body to move, wherein the third driving component is limitedly connected through the limit mounting hole, and the direction of the thrust generated by the driving fan is changed by a rotating disk, which is convenient for generating thrust for moving the hull body and changing the direction of the thrust, wherein several groups of rubber belts are arranged around the airbag to prevent the airbag from being damaged, and the inflator is connected to the airbag, which is convenient for using the inflator to inflate the airbag, which is beneficial to automatic inflation of the airbag, and two groups of first pneumatic components and second pneumatic components are provided, which are convenient for the first pneumatic components and the second pneumatic components to generate buoyancy and generate thrust in the water. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the embodiment of the present application from above; Figure 2 It is a structural schematic diagram of the embodiment of the present application; Figure 3 is a schematic diagram of the structure of the airbag in a top view according to an embodiment of the present application; Figure 4 is a schematic diagram of the structure of the second pneumatic assembly in a front section according to an embodiment of the present application; Figure 5is a schematic structural diagram of a servo telescopic rod in a front view of an embodiment of the present application; Figure 6 is a schematic diagram of the structure of the first pneumatic component in a front section according to an embodiment of the present application; Explanation of the reference numerals: 1. hull body; 2. first pneumatic component; 21. blower; 22. air guide pipe; 23. air guide cover; 24. air outlet; 3. second pneumatic component; 31. limit mounting plate; 32. second pneumatic mechanism; 33. servo rotating disk; 34. first fixed block; 35. second fixed block; 36. jet pipe; 37. servo telescopic rod; 38. bearing seat; 39. one-way valve; 310. connecting head; 4. third drive component; 5. airbag; 6. limit mounting hole; 7. deck; 8. rubber belt; 9. inflator. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1 - Attachment Figure 6 , further details of this application are given.

[0025] Embodiment: A hovercraft comprises a hull body 1, a first pneumatic assembly 2, a second pneumatic assembly 3 and a third drive assembly 4, an airbag 5 is arranged on the bottom end surface of the hull body 1, and the first pneumatic assembly 2 is arranged on the inner side of the airbag 5, a second pneumatic assembly 3 is arranged on one side of the first pneumatic assembly 2, a third drive assembly 4 is installed on the upper end surface of the hull body 1, the second pneumatic assembly 3 comprises a limit mounting plate 31 and a second pneumatic mechanism 32, the limit mounting plate 31 is installed on the bottom end surface of the hull body 1, and the second pneumatic mechanism 32 is arranged on the bottom end surface of the limit mounting plate 31, the second pneumatic mechanism 32 comprises a servo rotating disk 33 and a first fixed block 34, the servo rotating disk 33 is installed on the limit mounting plate 3 1, and the bottom end surface of the servo rotating disk 33 is installed with a first fixed block 34, the bottom end surface of the first fixed block 34 is installed with a second fixed block 35, the side end surface of the second fixed block 35 is connected with an air injection pipe 36 through a bearing, the side end surfaces of the first fixed block 34 and the air injection pipe 36 are provided with a servo telescopic rod 37, and the two ends of the servo telescopic rod 37 are respectively connected with the first fixed block 34 and the two sides of the air injection pipe 36 through a bearing seat 38, and the contact surface of the bearing seat 38 and the first fixed block 34 and the air injection pipe 36 is provided with a bearing, and the end of the air injection pipe 36 away from the second fixed block 35 is provided with a one-way valve 39, and the bottom end surface of the air injection pipe 36 is connected with a connecting head 310, wherein the connecting head 310 is connected to the air source placed on the hull body 1 through an air pipe, so as to facilitate the ejection of airflow, wherein the jet pipe 36 is placed in the water and ejects air, and the jet pipe 36 is specifically made of a rigid pipe, and the water is pushed by the gas, and the water body is used to give a reaction force, so that the ship moves forward, and because the jet pipe 36 is placed in the water, the air flow required for the ship to move forward is less, and the generated gas can be used more efficiently to make the ship move forward, thereby realizing the propulsion of the ship, the first pneumatic component 2 includes a blower 21 and an air guide pipe 22, the output end of the blower 21 is provided with an air guide cover 23, and the air guide cover 23 is connected to the air guide pipe 22, and the bottom end surface of the air guide pipe 22 is connected to An air outlet 24 is connected, wherein buoyancy is generated by the blower 21, the air guide pipe 22, the air guide cover 23 and the air outlet 24, thereby realizing separation of the hull body 1 from the water surface or the land, thereby forming an air layer, which is convenient for the hull body 1 to move, a limited mounting hole 6 is provided on the upper end surface of the hull body 1, and the hull body 1 is connected to the third driving component 4 through the limited mounting hole 6, a deck 7 is provided on the upper end surface of the hull body 1, a rubber belt 8 is provided around the airbag 5, and the airbag 5 is connected to the inflator 9, wherein a limited mounting hole 6 is provided, which is convenient for the hull body 1 to be limitedly connected with the third driving component 4, so that the third driving component 4 can push the hull body 1 to move; The third driving component 4 is composed of a limit frame, a pushing fan and a rotating disk, wherein a pushing fan is installed on the inner side of the limit frame, and a rotating disk is provided on the contact surface between the limit frame and the limit mounting hole 6, wherein the pushing fan is limited by the limit frame and the rotating disk, wherein the pushing fan generates thrust, thereby realizing the movement of the hull body 1, and the direction of the thrust generated by the pushing fan is changed by the rotating disk, thereby realizing the movement of the hull body 1, the first fixed block 34 forms a rotating structure rotating around the center of the servo rotating disk 33 through the servo rotating disk 33 and the limit mounting plate 31, the second fixed block 35 forms a rotating structure rotating around the center of the bearing through the bearing and the jet pipe 36, wherein the servo rotating disk 33, the first fixed block 34 and the second fixed block 35 are adjusted The rotation angle and direction of the jet pipe 36 are adjusted, so as to facilitate the movement of the hull body 1 to the corresponding orientation. By controlling the angle and direction of the jet pipe 36 placed in the water, the hull body 1 is moved. The servo telescopic rod 37 forms a rotating structure rotating around the bearing center with the first fixed block 34 and the jet pipe 36 through the bearing seat 38 and the bearing. The one-way valve 39 forms a connecting structure with the connecting head 310 through the jet pipe 36, wherein the servo telescopic rod 37, the bearing seat 38 and the bearing are used to control the angle adjustment of the jet pipe 36, so as to change the angle of the jet pipe 36 placed in the water, and a one-way valve 39 is provided at one end of the jet pipe 36 to prevent water backflow, so as to facilitate the movement of the hull body 1. The output end of the blower 21 is connected to the guide The wind cover 23 forms a connecting structure, the blower 21 forms a connecting structure with the air guide pipe 22 through the wind guide cover 23, and the air guide pipe 22 forms a connecting structure with the air outlet 24, wherein the blower 21 is started, the blower 21 generates gas, and the gas flows into the air guide pipe 22 through the wind guide cover 23, and then the gas is ejected from the air outlet 24, realizing a vertical upward thrust, thereby realizing the buoyancy of the hull body 1, increasing the buoyancy of the hull body 1, forming a layer of air layer, so that the hull body 1 can move, the hull body 1 is limitedly connected with the third drive assembly 4 through the limiting mounting hole 6, and the third drive assembly 4 forms a rotating structure rotating around the center of the rotating disk with the hull body 1 through the rotating disk, wherein the third drive assembly 4 is limitedly connected to the hull body 1 through the limiting mounting hole 6 The airbag 5 is connected to the airbag 5, and the direction of the thrust generated by the fan is changed by the rotating disk, so as to generate thrust for the movement of the hull body 1 and change the direction of the thrust. The rubber belt 8 is provided with several groups, and several groups of rubber belts 8 are arranged on the outer surface of the airbag 5. The output end of the inflator 9 forms a connecting structure with the airbag 5. The first pneumatic component 2 and the second pneumatic component 3 are each provided with two groups, and the two groups of the first pneumatic components 2 and the second pneumatic components 3 are symmetrically arranged, wherein several groups of rubber belts 8 are arranged around the airbag 5 to prevent the airbag 5 from being damaged, and the inflator 9 is connected to the airbag 5, so as to facilitate the inflator 9 to inflate the airbag 5, which is beneficial to the automatic inflation of the airbag 5, and wherein two groups of the first pneumatic components 2 and the second pneumatic components 3 are provided,It is convenient for the first pneumatic assembly 2 and the second pneumatic assembly 3 to generate buoyancy and thrust in the water.

[0026] The implementation principle of the embodiment of the present application is as follows: the blower 21 is started, the blower 21 generates gas, the gas flows into the air guide pipe 22 through the air guide cover 23, and the gas is ejected from the air outlet 24 to achieve vertical upward thrust, increase the buoyancy of the hull body 1, and form an air layer to facilitate the movement of the hull body 1. The servo rotating disk 33, the first fixed block 34 and the second fixed block 35 are used to adjust the rotation angle and direction of the jet pipe 36, so that the hull body 1 can move to the corresponding direction. The angle of the jet pipe 36 placed in the water is controlled by the servo rotating disk 33, the first fixed block 34 and the second fixed block 35. The servo telescopic rod 37, the bearing seat 38 and the bearing are used to control the angle adjustment of the jet pipe 36, thereby changing the angle at which the jet pipe 36 is placed in the water. A one-way valve 39 is provided at one end of the jet pipe 36 to prevent water backflow, thereby facilitating the movement of the hull body 1. The jet pipe 36 is placed in the water and sprays gas, and the water is pushed by the gas, and the water body is used to give a reaction force to make the ship move forward. Moreover, since the jet pipe 36 is placed in the water, the air flow required for the ship to move forward is less, and the generated gas can be used more efficiently to make the ship move forward, thereby realizing the propulsion of the ship. A limited mounting hole 6 is provided to facilitate the limited connection between the hull body 1 and the third drive component 4, so that the third drive component 4 can push the hull body 1 to move. The limiting frame and the rotating disk are used to limit the propulsion fan, wherein the propulsion fan generates thrust to realize the movement of the hull body 1, and the rotating disk is used to change the direction of the thrust generated by the propulsion fan to realize the movement of the hull body 1. The limiting mounting hole 6 is used to control the third drive component 4 to push the hull body 1 to move. The component 4 is connected in a limiting manner, and a rotating disk is used to change the direction of the thrust generated by the propulsion fan, so as to generate thrust for moving the hull body 1 and change the direction of the thrust. Several groups of rubber belts 8 are arranged around the airbag 5 to prevent the airbag 5 from being damaged, and the inflator 9 is connected to the airbag 5, so as to facilitate the inflator 9 to inflate the airbag 5 and automatically inflate the airbag 5. Two groups of first pneumatic components 2 and second pneumatic components 3 are provided, so as to facilitate the first pneumatic components 2 and the second pneumatic components 3 to generate buoyancy and thrust in the water.

[0027] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An air cushion vehicle, comprising a hull body (1), a first pneumatic assembly (2), a second pneumatic assembly (3) and a third driving assembly (4), characterized in that: The bottom end surface of the hull body (1) is provided with an air bag (5), and a first pneumatic assembly (2) is provided on the inner side of the air bag (5); a second pneumatic assembly (3) is provided on one side of the first pneumatic assembly (2); a third driving assembly (4) is installed on the upper end surface of the hull body (1); the second pneumatic assembly (3) comprises a limit mounting plate (31) and a second pneumatic mechanism (32); the limit mounting plate (31) is installed on the bottom end surface of the hull body (1); the second pneumatic mechanism (32) is provided on the bottom end surface of the limit mounting plate (31); the second pneumatic mechanism (32) comprises a servo rotating disk (33) and a first fixed block (34); the servo rotating disk (33) is installed on the bottom end surface of the limit mounting plate (31); and the servo rotating disk (33) is provided with a first fixed block (34). A first fixing block (34) is mounted on the bottom end surface, a second fixing block (35) is mounted on the bottom end surface of the first fixing block (34), a side end surface of the second fixing block (35) is connected to an air jet pipe (36) via a bearing, a servo telescopic rod (37) is arranged on the side end surfaces of the first fixing block (34) and the air jet pipe (36), and two ends of the servo telescopic rod (37) are respectively connected to the first fixing block (34) and the air jet pipe (36) via a bearing seat (38) in a limit connection manner on both sides, and a bearing is arranged on the contact surface between the bearing seat (38) and the first fixing block (34) and the air jet pipe (36), a one-way valve (39) is arranged on one end of the air jet pipe (36) away from the second fixing block (35), and a connecting head (310) is connected to the bottom end surface of the air jet pipe (36).

2. The hovercraft according to claim 1, characterized in that: The first pneumatic assembly (2) comprises a blower (21) and an air duct (22); an air duct (23) is provided at the output end of the blower (21); the air duct (23) is in communication with the air duct (22); and the bottom end surface of the air duct (22) is in communication with an air outlet (24).

3. The hovercraft according to claim 1, characterized in that: The upper end surface of the hull body (1) is provided with a limit mounting hole (6), and the hull body (1) is connected to a third driving assembly (4) via the limit mounting hole (6); the upper end surface of the hull body (1) is provided with a deck (7); a rubber belt (8) is provided around the airbag (5); and the airbag (5) is connected to an inflator (9).

4. The hovercraft according to claim 1, characterized in that: The third driving assembly (4) is composed of a limiting frame, a pushing fan and a rotating disk, wherein the pushing fan is installed on the inner side of the limiting frame, and the contact surface between the limiting frame and the limiting installation hole (6) is provided with a rotating disk.

5. The hovercraft according to claim 1, characterized in that: The first fixed block (34) forms a rotating structure rotating around the center of the servo rotating disk (33) through the servo rotating disk (33) and the limiting mounting plate (31), and the second fixed block (35) forms a rotating structure rotating around the center of the bearing through the bearing and the air injection pipe (36).

6. The hovercraft according to claim 1, characterized in that: The servo telescopic rod (37) forms a rotating structure that rotates around the center of the bearing with the first fixed block (34) and the air injection pipe (36) through the bearing seat (38) and the bearing, and the one-way valve (39) forms a connecting structure with the connecting head (310) through the air injection pipe (36).

7. The hovercraft according to claim 2, characterized in that: The output end of the blower (21) and the air guide cover (23) form a communication structure, the blower (21) and the air guide pipe (22) form a communication structure through the air guide cover (23), and the air guide pipe (22) and the air outlet (24) form a communication structure.

8. The hovercraft according to claim 3, characterized in that: The hull body (1) is connected to the third drive assembly (4) in a limiting manner via a limiting mounting hole (6); the third drive assembly (4) forms a rotating structure with the hull body (1) via a rotating disk, the rotating structure rotating around the center of the rotating disk.

9. The hovercraft according to claim 3, characterized in that: The rubber belt (8) is provided in a plurality of groups, and the plurality of groups of rubber belts (8) are arranged on the outer surface of the airbag (5); the output end of the inflator (9) forms a communication structure with the airbag (5); the first pneumatic assembly (2) and the second pneumatic assembly (3) are each provided in two groups, and the two groups of the first pneumatic assembly (2) and the second pneumatic assembly (3) are symmetrically arranged.

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