Large-nozzle rocket transportation supporting structure and method

Abstract

The invention provides a large-jet-pipe rocket transportation supporting structure and method, and belongs to the technical field of large-jet-pipe rocket transportation. The large-jet-pipe rocket transportation supporting structure comprises a jet pipe tail end air bag assembly and a jet pipe tail supporting bracket which are arranged on an engine jet pipe; the nozzle tail end airbag assembly is arranged at the tail end of the inner wall of the engine nozzle and used for supporting and limiting the inner wall of the engine nozzle. The jet pipe tail supporting bracket is arranged at the tail end of the engine jet pipe and used for supporting and positioning the tail end of the engine jet pipe. The tail end and the tail end of the spray pipe are supported and limited correspondingly, supporting protection is conducted in the transporting, erecting or transshipping process, deformation or damage of the spray pipe caused by external force influence is avoided, and the stability and reliability of transporting and erecting can be improved easily; the method is easy and convenient to operate and stable and reliable to use.

Description

Technical Field

[0001] The present invention relates to the technical field of large nozzle rocket transportation, and in particular to a large nozzle rocket transportation support structure and method. Background Art

[0002] Before the launch of a liquid rocket, a corresponding transport structure is required for transfer and erection operations. For example, the Chinese patent application number is: 202120496809.3, and the patent name is: A launch vehicle engine swing support device. Although it can meet the general use requirements, with the continuous development of liquid rocket systems, in order to maximize the rocket carrying efficiency, the upper stage rocket adopts an ultra-large nozzle structure to increase the expansion ratio, which can effectively increase the engine vacuum fall force load.

[0003] However, since the engine's super-large nozzles are mostly thin-walled structures, the ratio of their effective thickness to the nozzle's outlet diameter is large, and the nozzle structure has poor rigidity. Therefore, it is easily deformed or damaged by external forces during conventional transportation, erection or transshipment, causing engine thrust line deviation or engine failure, affecting the effectiveness and reliability of liquid rocket transportation and erection, and limiting its applicability. Summary of the invention

[0004] In view of this, the purpose of the embodiments of the present invention is to provide a large nozzle rocket transportation support structure and method with a reasonable structural setting and conducive to improving the reliability of transportation or erection.

[0005] The embodiment of the present invention provides a large nozzle rocket transport support structure, which is arranged on the engine nozzle and includes a nozzle end airbag assembly and a nozzle tail support bracket;

[0006] The nozzle end airbag assembly is arranged at the end of the inner wall of the engine nozzle, and is used for supporting and limiting the inner wall of the engine nozzle;

[0007] The nozzle tail support bracket is arranged at the tail end of the engine nozzle and is used for supporting and positioning the tail end of the engine nozzle.

[0008] It is further preferred that: the nozzle end airbag assembly comprises an airbag body, a support ring, an adjustment hand wheel and an adjustment screw;

[0009] The support ring is fixed to the rocket stage or the transport vehicle by fastening bolts, the airbag body is located at the end of the inner wall of the engine nozzle, and the adjusting screw is fixed to the bottom surface of the airbag body;

[0010] The adjusting screw is threadedly connected to the supporting ring, and the adjusting hand wheel is fixed to the end of the adjusting screw.

[0011] It is further preferred that: the nozzle end airbag assembly further comprises a plurality of inclined tie rods for increasing rigidity;

[0012] The plurality of inclined tie rods are arranged in a cone shape, and a guide channel which is on the same vertical line as the threaded hole is arranged at the center of the cone;

[0013] The adjusting screw is arranged in the guide channel.

[0014] It is further preferred that the pressure in the airbag body is 0.13-0.25 MPa, and the airbag body is an independent airbag or a combination of several airbags.

[0015] It is further preferred that: it also includes a nozzle throat support assembly;

[0016] The nozzle throat support assembly is fixed on the outer wall of the engine nozzle throat and is used for supporting and positioning the engine nozzle throat.

[0017] Further preferably, a threaded hole is provided on the support ring, and the adjusting screw is threadedly connected and passes through the threaded hole;

[0018] The adjusting hand wheel is used to rotate and drive the adjusting screw to rotate in the threaded hole, and to make the airbag body expand and contract in the engine nozzle along the arrow body axis direction, and the edge of the airbag body is tightly connected to the inner wall of the engine nozzle.

[0019] Further preferably, the end of the inclined tie rod is fixed on the top surface of the support ring.

[0020] Further preferably, the top end of the inclined tie rod is fixed to an end of the adjusting screw rod close to the airbag body.

[0021] It is further preferred that: the nozzle tail support bracket includes an upper arc plate, a support and a lower arc plate;

[0022] The support is fixed on the rocket stage or the transport vehicle;

[0023] The upper arc plate and the lower arc plate are fixed on the support, and the tail end of the engine nozzle is clamped between the upper arc plate and the lower arc plate to limit the position.

[0024] It is further preferred that protective felt cushions are provided between the upper arc plate and the tail end of the engine nozzle, and between the lower arc plate and the tail end of the engine nozzle.

[0025] Further preferably, the nozzle throat support assembly comprises a split clamp, an ear seat, a double-rotation screw, a left-rotation nut, a right-rotation nut, a plurality of bolts and a bearing;

[0026] The ear seat is fixed on the rocket stage or the transport vehicle, and the split clamp is fixed on the outer wall of the engine nozzle throat;

[0027] The right-handed nut is connected to the split clamp or the ear seat through the bolt and the bearing, and the left-handed nut is connected to the ear seat or the split clamp through the bolt and the bearing.

[0028] The two ends of the double-thread screw are respectively threadedly connected with the left-handed nut and the right-handed nut.

[0029] More preferably, the twin-rotation screws are in two groups, and the angle between the two groups of twin-rotation screws is 45 degrees to 120 degrees.

[0030] On the other hand, the present invention also provides a large nozzle rocket transportation support method, the method comprising: arranging a nozzle end airbag assembly at the end of the inner wall of the engine nozzle, and supporting and limiting the inner wall of the engine nozzle by the nozzle end airbag assembly during transportation;

[0031] A nozzle tail support bracket is arranged at the tail end of the engine nozzle, and the tail end of the engine nozzle is supported and positioned by the nozzle tail support bracket during transportation.

[0032] The above technical solution has the following beneficial effects:

[0033] 1. The structure of the present invention is reasonable, and it includes a nozzle throat support assembly, a nozzle end airbag assembly and a nozzle tail support bracket, which can support and limit the nozzle throat, nozzle end and tail respectively, so as to provide support and protection during transportation, erection or reloading, and can avoid deformation or damage of the nozzle caused by external forces, which is conducive to improving the stability and reliability of transportation and erection, and is stable and reliable in use;

[0034] 2. The nozzle end airbag assembly of the present invention comprises an airbag body, a support ring, an adjusting hand wheel and an adjusting screw. During assembly, the airbag body is tightly attached to the inner wall of the engine nozzle, which can support and protect the inner wall of the nozzle and prevent the nozzle from being deformed or damaged. Moreover, the airbag body can be tightly supported on the inner wall of the nozzle by adjusting the screw, thereby ensuring the stability and reliability of the connection.

[0035] 3. The nozzle end airbag assembly of the present invention further includes an inclined rod for increasing rigidity, which cooperates with the support ring to ensure the stability of the adjusting screw and prevent it from tilting or shifting, thereby ensuring the smooth and effective lifting of the airbag body;

[0036] 4. The pressure in the airbag body of the present invention is 0.13-0.25MPa, and the airbag body is an independent airbag or a combination of several airbags, which can ensure the stability and effectiveness of the connection with the nozzle;

[0037] 5. The nozzle tail support bracket of the present invention includes an upper arc plate, a support and a lower arc plate, which can not only effectively and quickly realize the support and positioning of the nozzle tail, but also ensure the stability and effectiveness of the connection;

[0038] 6. In the present invention, protective felt cushions are provided between the upper arc plate and the tail end of the engine nozzle, and between the lower arc plate and the tail end of the engine nozzle, which can provide auxiliary support for the tail of the nozzle to prevent the nozzle from deformation or damage;

[0039] 7. The nozzle throat support assembly of the present invention includes a split clamp, an ear seat, a double-rotation screw, a left-rotation nut, a right-rotation nut, a plurality of bolts and a bearing, which is convenient for disassembly and use, and the double-rotation screw cooperates with the left-rotation nut and the right-rotation nut to achieve telescopic adjustment, thereby ensuring the stability and reliability of the connection;

[0040] 8. The method of the present invention is easy to operate and stable and reliable to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0043] Figure 2 The embodiment of the present invention Figure 1 The AA section shows the schematic structure diagram;

[0044] Figure 3 The embodiment of the present invention Figure 2 The enlarged structural diagram at B in the middle;

[0045] Figure 4 The embodiment of the present invention Figure 1 The enlarged structural diagram at C in the middle;

[0046] Figure 5 The embodiment of the present invention Figure 4 Enlarged structural diagram at point D in the middle.

[0047] Description of reference numerals:

[0048] 1. Rocket stage interstage; 2. Engine nozzle;

[0049] 3. Nozzle throat support assembly; 31. Split clamp; 32. Ear seat; 33. Double-rotation screw; 34. Left-hand nut; 35. Right-hand nut; 36. Bolt; 37. Bearing;

[0050] 4. Nozzle end airbag assembly; 41. Airbag body; 42. Support ring; 43. Adjustment hand wheel; 44. Adjustment screw; 45. Threaded hole; 46. Diagonal tie rod;

[0051] 5. nozzle tail support bracket; 51. upper arc plate; 52. support; 53. lower arc plate;

[0052] 6. Guidance channel. DETAILED DESCRIPTION

[0053] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed in order to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least part of the known structures and technologies are not shown in order to avoid unnecessary ambiguity of the present invention; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0054] like Figures 1 to 5 As shown, a large nozzle rocket transport support structure is arranged on the engine nozzle 2, or arranged on a separate engine nozzle 2, including a nozzle end airbag assembly 4 and a nozzle tail support bracket 5; its rocket stage interstage 1 or transport vehicle and engine nozzle 2 are conventional structures of the prior art, so they are not recorded in detail, but simply applied, the nozzle end airbag assembly 4 is arranged at the end of the inner wall of the engine nozzle 2, and is used for supporting and limiting the inner wall of the engine nozzle 2; the nozzle tail support bracket 5 is arranged at the tail end of the engine nozzle 2, and is used for supporting and positioning the tail end of the engine nozzle 2. By supporting and limiting the nozzle throat and the nozzle tail, and supporting and limiting the nozzle inner wall through the nozzle end airbag assembly 4, the inside and outside of the nozzle can be protected and supported at the same time during the reloading, transportation or erection process, so that the nozzle can be effectively prevented from being deformed or damaged, and the convenience of operation and reliability of use are improved.

[0055] In actual application, Figure 1 and Figure 4As shown, the nozzle end airbag assembly 4 includes an airbag body 41, a support ring 42, an adjustment hand wheel 43 and an adjustment screw 44. The adjustment screw 44 is mainly used to rotate to complete the position adjustment of the airbag body 41, so that it can be tightly supported with the inner wall of the nozzle to ensure the stability and reliability of the protection of the inner wall of the nozzle; during assembly, the support ring 42 is fixed to the rocket stage 1 or the transport vehicle by fastening bolts, and the support ring 42 is provided with a threaded hole 45; during assembly, the airbag body 41 is at the end of the inner wall of the engine nozzle 2, and the adjustment screw 44 is fixed to the bottom surface of the airbag body 41; the adjustment screw 44 is threadedly connected and passes through the threaded hole 45, and the adjustment hand wheel 43 is fixed to the end of the adjustment screw 44; and the adjustment hand wheel 43 is used to rotate and drive the adjustment screw 44 to rotate in the threaded hole 45, and make the airbag body 41 expand and contract in the engine nozzle 2 along the arrow body axis direction, and the edge of the airbag body 41 is tightly connected with the inner wall of the engine nozzle 2.

[0056] In this embodiment, the airbag body 41 can be annular or circular. When in use, it can be filled with air or other gas or liquid, so that the airbag body 41 has flexibility, so as to achieve the corresponding support effectiveness and reliability. In the actual application process, the nozzle end airbag assembly 4 also includes a plurality of inclined rods 46 for increasing rigidity; and the plurality of inclined rods 46 are arranged in a conical shape, and the center of the cone is provided with a guide channel 6 which is on the same vertical line as the threaded hole 45; the adjusting screw 44 is inserted into the guide channel 6. In this embodiment, the inclined rod 46 can also be replaced by other pull rod-type structures, which is mainly used to prevent the adjusting screw 44 from tilting. It is mainly used to adjust the stability of the screw 44, prevent it from tilting or shifting, and improve the stability and reliability of use. The number of inclined rods ranges from six to twelve, and they are evenly distributed in the circumferential direction, so as to ensure the effectiveness and stability of the support. The material is Q690D material.

[0057] In actual application, the pressure in the airbag body 41 can be 0.13-0.25MPa, and the airbag body 41 is an independent airbag or a combination of several airbags with smaller volumes. In addition, during assembly, the end of the inclined rod 46 is fixed on the top surface of the support ring 42. Alternatively, the top end of the inclined rod 46 is fixed on the end of the adjusting screw 44 close to the airbag body 41. Thus, the support effectiveness and reliability can be achieved.

[0058] like Figure 5As shown, in actual application, the nozzle tail support bracket 5 includes an upper arc plate 51, a support 52 and a lower arc plate 53; in this embodiment, the upper arc plate 51 and the lower arc plate 53 are shaped according to the nozzle mouth size, and the circumferential angle is about 45°. During assembly, the support 52 is fixed to the rocket stage 1 or the transport vehicle; the upper arc plate 51 and the lower arc plate 53 are fixed on the support 52, and the tail end of the engine nozzle 2 is clamped between the upper arc plate 51 and the lower arc plate 53. Protective felt cushions are provided between the upper arc plate 51 and the tail end of the engine nozzle 2, and between the lower arc plate 53 and the tail end of the engine nozzle 2. It can also be replaced with other soft materials, which can prevent the engine nozzle 2 from being damaged during assembly and improve the stability and reliability of use.

[0059] like Figure 2 As shown, it also includes a nozzle throat support assembly 3. During assembly, the nozzle throat support assembly 3 is fixed to the outer wall of the throat of the engine nozzle 2 to support and position the throat of the engine nozzle 2.

[0060] The nozzle throat support assembly 3 includes a split clamp 31, an ear seat 32, a double-screw 33, a left-handed nut 34, a right-handed nut 35, a plurality of bolts 36 and a bearing 37. During assembly, the ear seat 32 is fixed to the rocket stage 1 or the transport vehicle, and the split clamp 31 is fixed to the outer wall of the throat of the engine nozzle 2; the right-handed nut 35 is connected to the split clamp 31 or the ear seat 32 through bolts 36 and bearings 37, and the left-handed nut 34 is connected to the ear seat 32 or the split clamp 31 through bolts 36 and bearings 37. The two ends of the double-screw 33 are respectively threadedly connected with the left-handed nut 34 and the right-handed nut 35. The double-screw 33 is in two groups, and the angle between the two groups of double-screw 33 is 45 degrees to 120 degrees. The bearing 37 can ensure the stability of relative rotation, and the double-screw 33 can be rotated as needed to adjust its position, thereby improving the stability and reliability of use.

[0061] In addition, an embodiment of the present invention further provides a large nozzle rocket transportation support method, the method comprising:

[0062] A nozzle end airbag assembly 4 is provided at the end of the inner wall of the engine nozzle 2, and the inner wall of the engine nozzle 2 is supported and limited by the nozzle end airbag assembly 4 during transportation;

[0063] A nozzle tail support bracket 5 is provided at the tail end of the engine nozzle 2 , and the tail end of the engine nozzle 2 is supported and positioned by the nozzle tail support bracket 5 during transportation.

[0064] The above technical solution has the following beneficial effects:

[0065] 1. The structure of the embodiment of the present invention is reasonable, and includes a nozzle throat support assembly, a nozzle end airbag assembly, and a nozzle tail support bracket, which can support and limit the nozzle throat, nozzle end, and tail respectively, so as to provide support and protection during transportation, erection, or reloading, and can avoid deformation or damage of the nozzle caused by external forces, which is conducive to improving the stability and reliability of transportation and erection, and is stable and reliable in use;

[0066] 2. The nozzle end airbag assembly in the embodiment of the present invention includes an airbag body, a support ring, an adjustment hand wheel and an adjustment screw. During assembly, the airbag body is tightly attached to the inner wall of the engine nozzle, which can support and protect the inner wall of the nozzle and prevent the nozzle from being deformed or damaged. In addition, the airbag body can be tightly supported on the inner wall of the nozzle by adjusting the screw to ensure the stability and reliability of the connection.

[0067] 3. The nozzle end airbag assembly in the embodiment of the present invention further includes an inclined rod for increasing rigidity, which cooperates with the support ring to ensure the stability of the adjusting screw and prevent it from tilting or shifting, thereby ensuring the smooth and effective lifting of the airbag body;

[0068] 4. The pressure in the airbag body in the embodiment of the present invention is 0.13-0.25MPa, and the airbag body is an independent airbag or a combination of several airbags, which can ensure the stability and effectiveness of the connection with the nozzle;

[0069] 5. The nozzle tail support bracket in the embodiment of the present invention includes an upper arc plate, a support and a lower arc plate, which can not only effectively and quickly realize the support and positioning of the nozzle tail, but also ensure the stability and effectiveness of the connection;

[0070] 6. In the embodiment of the present invention, protective felt cushions are provided between the upper arc plate and the tail end of the engine nozzle, and between the lower arc plate and the tail end of the engine nozzle, which can provide auxiliary support for the tail of the nozzle to prevent the nozzle from deformation or damage;

[0071] 7. The nozzle throat support assembly in the embodiment of the present invention includes a split clamp, an ear seat, a double-turn screw, a left-turn nut, a right-turn nut, a plurality of bolts and a bearing, which is convenient for disassembly, assembly and use, and telescopic adjustment is achieved by the double-turn screw in conjunction with the left-turn nut and the right-turn nut to ensure the stability and reliability of the connection.

[0072] 8. The method of the present invention is easy to operate and stable and reliable to use.

[0073] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0074] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A large nozzle rocket transport support structure, arranged on the engine nozzle (2), characterized in that: It comprises a nozzle end airbag assembly (4) and a nozzle tail support bracket (5); The nozzle end airbag assembly (4) is arranged at the end of the inner wall of the engine nozzle (2) and is used for supporting and limiting the inner wall of the engine nozzle (2); The nozzle tail support bracket (5) is arranged at the tail end of the engine nozzle (2) and is used for supporting and positioning the tail end of the engine nozzle (2).

2. A large nozzle rocket transport support structure according to claim 1, characterized in that: The nozzle end airbag assembly (4) comprises an airbag body (41), a support ring (42), an adjustment hand wheel (43) and an adjustment screw (44); The support ring (42) is fixed to the rocket stage (1) or the transport vehicle by means of fastening bolts, the airbag body (41) is located at the end of the inner wall of the engine nozzle (2), and the adjusting screw (44) is fixed to the bottom surface of the airbag body (41); The adjusting screw (44) is threadedly connected to the supporting ring (42), and the adjusting hand wheel (43) is fixed to the end of the adjusting screw (44).

3. A large nozzle rocket transport support structure according to claim 2, characterized in that: The nozzle end airbag assembly (4) further comprises a plurality of inclined tie rods (46) for increasing rigidity; The plurality of inclined tie rods (46) are arranged in a conical shape, and a guide channel (6) which is on the same vertical line as the threaded hole (45) is arranged at the center of the cone; The adjusting screw (44) is inserted into the guide channel (6).

4. A large nozzle rocket transport support structure according to claim 2, characterized in that: The pressure in the airbag body (41) is 0.13-0.25 MPa, and the airbag body (41) is an independent airbag or a combination of several airbags.

5. A large nozzle rocket transport support structure according to claim 2, characterized in that: The support ring (42) is provided with a threaded hole (45), and the adjusting screw (44) is threadedly connected and passes through the threaded hole (45); The adjusting hand wheel (43) is used to rotate and drive the adjusting screw (44) to rotate in the threaded hole (45), and to make the airbag body (41) expand and contract in the engine nozzle (2) along the arrow body axis direction, and the edge of the airbag body (41) is tightly connected to the inner wall of the engine nozzle (2).

6. A large nozzle rocket transport support structure according to claim 3, characterized in that: The end of the inclined tie rod (46) is fixed on the top surface of the support ring (42).

7. A large nozzle rocket transport support structure according to claim 3, characterized in that: The top end of the inclined tie rod (46) is fixed to an end of the adjusting screw rod (44) close to the airbag body (41).

8. The large nozzle rocket transport support structure according to claim 1, characterized in that: The nozzle tail support bracket (5) comprises an upper arc plate (51), a support (52) and a lower arc plate (53); The support (52) is fixed on the rocket stage (1) or the transport vehicle; The upper arc plate (51) and the lower arc plate (53) are fixed on the support (52), and the tail end of the engine nozzle (2) is clamped between the upper arc plate (51) and the lower arc plate (53) to limit the position.

9. A large nozzle rocket transport support structure according to claim 8, characterized in that: Protective felt cushions are provided between the upper arc plate (51) and the tail end of the engine nozzle (2), and between the lower arc plate (53) and the tail end of the engine nozzle (2).

10. The large nozzle rocket transport support structure according to claim 1, characterized in that: Also included is a nozzle throat support assembly (3); The nozzle throat support assembly (3) is fixed on the outer wall of the throat of the engine nozzle (2) and is used to support and position the throat of the engine nozzle (2).

11. A large nozzle rocket transport support structure according to claim 10, characterized in that: The nozzle throat support assembly (3) comprises a split clamp (31), an ear seat (32), a double-rotation screw (33), a left-rotation nut (34), a right-rotation nut (35), a plurality of bolts (36) and a bearing (37); The ear seat (32) is fixed on the rocket stage (1) or the transport vehicle, and the split clamp (31) is fixed on the outer wall of the throat of the engine nozzle (2); The right-handed nut (35) is connected to the split clamp (31) or the ear seat (32) through the bolt (36) and the bearing (37), and the left-handed nut (34) is connected to the ear seat (32) or the split clamp (31) through the bolt (36) and the bearing (37). The two ends of the double-threaded screw (33) are respectively threadedly connected to the left-handed nut (34) and the right-handed nut (35).

12. A large nozzle rocket transport support structure according to claim 11, characterized in that: The twin-rotation screws (33) are in two groups, and the angle between the two groups of twin-rotation screws (33) is in the range of 45 to 120 degrees.

13. A method for transporting and supporting a large nozzle rocket, characterized in that: The method comprises: A nozzle end airbag assembly (4) is arranged at the end of the inner wall of the engine nozzle (2), and the inner wall of the engine nozzle (2) is supported and limited by the nozzle end airbag assembly (4) during transportation; A nozzle tail support bracket (5) is arranged at the tail end of the engine nozzle (2), and the tail end of the engine nozzle (2) is supported and positioned by the nozzle tail support bracket (5) during transportation.

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