A fixture for bonding and curing a canted reverse-thrust rocket nozzle

Abstract

The application provides a tool for bonding and curing of a bevelled reverse thrust rocket nozzle, which comprises a fixing base and an upper pressing plate; the fixing base is used for fixing a nozzle shell so that a nozzle port of the nozzle shell is vertically arranged; the upper pressing plate is installed above the fixing base through a connecting piece; a threaded through hole is formed in the upper pressing plate and is arranged along an axis of a bonding surface of a throat liner and the nozzle shell; and a pressing assembly for pressing the throat liner against the nozzle shell is threadedly connected to the threaded through hole. The tool adopts a groove type design which is convenient for product installation; through coaxial screwing force acting on a bonding conical surface, the nozzle shell is bonded more conveniently and quickly; meanwhile, the upper and peripheral fields of view are not hindered, the bonding process is more clear and controllable, and the removal of excess overflow glue is more convenient than the existing bonding condition; assembly surface abrasion is avoided; the nozzle bonding quality is obviously improved; and the tool is suitable for bonding and curing of most special-shaped bevelled reverse thrust rocket nozzles.

Description

Technical Field

[0001] This invention relates to the field of retrorockets nozzle processing and manufacturing technology, specifically to a tooling for bonding and curing obliquely cut retrorockets nozzles. Background Technology

[0002] Retro-rocket, also known as a separation engine, differs from the main engine of a solid rocket in that it provides propulsion. Instead, it provides a reverse thrust to the system. Small in size, simple in structure, single-function, and highly efficient, it plays a unique role in rocket flight. When the rocket reaches its designated position or the multi-stage engines complete their work, the onboard computer issues a detonation command, igniting the retro-rocket. This action propels the multi-stage engines away from the main rocket body, completing the retro-rocket's operation. Conventional retro-rocket structures are relatively simple, with the nozzle and combustion chamber's central axes parallel. However, the application of vector engines now places greater demands on the directionality of retro-rockets. New types of oblique-cut nozzles, forming a certain angle with the combustion chamber's central axis, allow for adjustable thrust direction. However, existing tooling is unsuitable for bonding and curing oblique-cut retro-rocket nozzles. This invention proposes a tooling for bonding and curing oblique-cut retro-rocket nozzles. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a tooling for bonding and curing obliquely cut retro-rocket nozzles, which can ensure the curing quality of the throat liner and nozzle shell.

[0004] To solve the above-mentioned technical problems, this application provides a tooling for bonding and curing obliquely cut retro-rocket nozzles, including a fixed base and an upper pressure plate;

[0005] The mounting base is used to fix the nozzle housing, so that the nozzle housing opening is arranged vertically;

[0006] The upper pressure plate is mounted above the fixed base via a connector. The upper pressure plate has a threaded through hole, which is arranged obliquely along the axis of the bonding surface between the throat liner and the nozzle housing. A clamping component for pressing the throat liner onto the nozzle housing is threaded onto the threaded through hole.

[0007] Furthermore, the clamping assembly includes a force-applying screw and a pad assembly. The force-applying screw is threadedly connected to a threaded through hole. One end of the force-applying screw is hemispherical. The pad assembly has a hemispherical groove that matches one end of the force-applying screw. One end of the force-applying screw abuts against the hemispherical groove of the pad assembly, so that the pad assembly presses the throat liner against the nozzle housing.

[0008] Furthermore, the pad assembly includes a pressure-bearing pad and a buffer pad, the hemispherical groove is formed on the pressure-bearing pad, and the buffer pad is in non-rigid contact with the throat liner.

[0009] Furthermore, the pressure-bearing pad and the buffer pad are rotatably connected. The pressure-bearing pad is provided with a protrusion, and the buffer pad is provided with a groove. The protrusion is inserted into the groove, and the protrusion and the groove are fitted with a clearance to prevent misalignment between the pressure-bearing pad and the buffer pad.

[0010] Furthermore, the pressure-bearing pad is made of metal, and the buffer pad is made of polytetrafluoroethylene.

[0011] Furthermore, a thickened block is provided on the upper pressure plate, and the threaded through hole is formed on the thickened block.

[0012] Furthermore, the thickened block is trapezoidal, and the thickened block has an inclined surface perpendicular to the threaded through hole.

[0013] Furthermore, the fixing base includes a clamping plate and a clamping block. One end of the clamping plate has an inwardly opening, and a groove is formed in the opening. The outer edge of the nozzle housing can be inserted into the groove of the opening. The clamping block is detachably connected to the end of the clamping plate with the opening, and the clamping block is used to press against the nozzle housing to fix the nozzle housing.

[0014] Furthermore, the connector includes a connecting rod perpendicular to the clamping plate, and the clamping block has an extrusion hole. The lower end of the connecting rod passes through the extrusion hole and is connected to the clamping plate. The connecting rod abuts against the inner wall of the extrusion hole, causing the clamping block to abut against the nozzle housing.

[0015] Furthermore, an observation hole is provided on the upper pressure plate for observing the alignment of the clamping assembly and the throat liner.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. The present invention fixes the nozzle housing by fixing the nozzle seat, and then uses the clamping component to press the throat liner onto the nozzle housing before curing the throat liner and the nozzle housing can begin. The installation is convenient and the threaded clamping component is easy to apply pressure.

[0018] 2. One end of the force-applying screw of the present invention is tangent to the spherical surface of the pad assembly, which can reduce the friction between the force-applying screw and the pad assembly and prevent the pad assembly from rotating with the rotation of the force-applying screw, thus affecting the bonding effect of the throat liner and the nozzle housing.

[0019] 3. The pad assembly of the present invention includes a pressure-bearing pad and a buffer pad, wherein the buffer pad is in non-rigid contact with the throat liner, which is beneficial to uniformly transmit the force of the force-applying screw to the throat liner and improves the curing effect.

[0020] 4. The pressure-bearing pad of the present invention is made of metal, and the buffer pad is made of polytetrafluoroethylene (PTFE). PTFE has an extremely low coefficient of friction, resulting in very low friction between the buffer pad and the pressure-bearing pad, as well as between the buffer pad and the throat liner. This prevents the force-applying screw from rotating and affecting the adhesion between the throat liner and the nozzle housing, and also protects the throat liner from wear.

[0021] 5. By setting a thickened block and opening the threaded through hole on the thickened block, the present invention increases the guiding length of the threaded through hole, so that the force-applying screw does not shake during the tightening process.

[0022] 6. The fixing seat of the present invention fixes the nozzle housing by fixing the outer wall of the nozzle housing, without using the thread inside the nozzle housing to fasten the nozzle housing, thus avoiding wear on the assembly surface inside the nozzle housing and reducing the wear of the thread or bluing layer inside the nozzle housing to 0.

[0023] 7. The fixing seat of the present invention allows the nozzle housing to be arranged vertically and the clamping assembly to be arranged at an angle. The observation hole opened on the upper pressure plate allows direct observation of the alignment between the clamping assembly and the throat liner, and facilitates the cleaning of excess overflowing adhesive. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention.

[0025] Figure 2 This is a cross-sectional view of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the pad assembly of the present invention.

[0027] Figure 4 This is a schematic diagram of the card plate of the present invention.

[0028] Figure 5 This is a schematic diagram of the bottom structure of the card block of the present invention.

[0029] Reference numerals: 1. Fixing base; 2. Clamping plate; 3. Clamping block; 4. Upper pressure plate; 5. Threaded through hole; 6. Clamping slot; 7. Extrusion hole; 8. Connecting rod; 9. Observation hole; 10. Force-applying screw; 11. Handle; 12. Nut; 13. Pressure-bearing pad; 14. Buffer pad; 15. Protrusion; 16. Groove; 17. Thickened block; 18. Nozzle housing; 19. Outer edge; 20. Plug; 21. Throat liner; 22. Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0031] like Figure 1 As shown, this embodiment provides a tooling for bonding and curing obliquely cut retrorockets, including a fixed base 1 and an upper pressure plate 4.

[0032] The fixing base 1 includes a locking plate 2 and a locking block 3, such as Figure 4 As shown, the card plate 2 is square in shape. Circular holes are opened at the four corners of the card plate 2 along the thickness direction. A U-shaped notch 6 is opened inward at one end of the card plate 2, making the card plate 2 as a whole U-shaped. The size of the notch 6 is just enough to accommodate the nozzle opening of the nozzle housing 19. A slot 7 is provided in the notch 6. During the process of inserting the nozzle opening of the nozzle housing 19 into the notch 6, the outer edge 20 of the nozzle opening of the nozzle housing 19 can be inserted into the slot 7.

[0033] like Figure 1 , 5 As shown, the card block 3 is positioned above one end of the card plate 2 where the card slot 6 is opened. An arc groove is opened on one side of the card block 3 to match the nozzle opening of the nozzle housing 19. U-shaped extrusion holes 8 are opened at both ends of the card block 3. The extrusion holes 8 correspond to the positions of the round holes. The extrusion holes 8 can also be waist-shaped holes.

[0034] like Figure 2 As shown, after the nozzle housing 19 is inserted into the clamping plate 2, the clamping block 3 is used to clamp the end of the clamping plate 2 with an opening. Then, the clamping block 3 is pushed onto the nozzle housing 19 by the connecting rod 9 (which can be threaded to the round hole) through the insertion of the round hole and the extrusion hole 8. This causes the clamping block 3 to press the nozzle housing 19 into the clamping slot 6. At this time, the nozzle housing 19 is vertically upward, while the tube body below the nozzle housing 19 is in an inclined state. This fixture for bonding and curing obliquely cut retro-rocket nozzles does not use the threads inside the nozzle housing 19 to fasten the nozzle housing 19, avoiding wear on the assembly surface inside the nozzle housing 19, which is beneficial to improving the nozzle bonding quality. It is suitable for bonding and curing most irregularly shaped obliquely cut retro-rocket nozzles.

[0035] like Figure 2 As shown, the upper pressure plate 4 is arranged parallel above the fixed base 1 via a connecting rod 9, and the upper end of the connecting rod 9 is fixed to the upper pressure plate 4 by bolts. A thickening block 18 is provided on the upper pressure plate 4, and the thickening block 18 is integrally formed with the upper pressure plate 4. The cross-section of the thickening block 18 is trapezoidal, and the thickening block 18 is provided with an inclined surface. An inclined threaded through hole 5 is provided from the inclined surface to the lower surface of the upper pressure plate 4. The threaded through hole 5 is perpendicular to the inclined surface, and a clamping component for pressing the throat liner 22 onto the nozzle housing 19 is threadedly connected to the threaded through hole 5.

[0036] The clamping assembly includes a force-applying screw 11 and a pad assembly. One end of the force-applying screw 11 is fixedly equipped with a handle 12 and a nut 13, and the other end of the force-applying screw 11 passes through a threaded through-hole 5 and abuts against the pad assembly. The pad assembly is placed on the throat liner 22 inside the nozzle housing 19. Since the threaded through-hole 5 is perpendicular to the inclined plane, the handle 12 of the force-applying screw 11 is parallel to the inclined plane, so that the thickened block 18 will not affect the operator's operation of the handle 12.

[0037] The force-applying screw 11 is threadedly connected to the threaded through hole 5. The force-applying screw 11 abuts against one end of the pad assembly in a hemispherical shape. The pad assembly has a hemispherical groove that matches one end of the force-applying screw 11. The force-applying screw 11 abuts against the hemispherical groove of the pad assembly, so that the pad assembly presses the throat liner 22 tightly against the nozzle housing 19. The force-applying screw 11 is tangent to the spherical surface of the pad assembly, which helps to reduce the friction between the two and prevents the pad assembly from rotating during the rotation of the force-applying screw 11, thus avoiding the throat liner 22 from rotating relative to the inner wall of the nozzle housing 19 and affecting the bonding effect between the two.

[0038] like Figure 3 As shown, the pad assembly includes a pressure-bearing pad 14 and a buffer pad 15. The pressure-bearing pad 14 is placed above the buffer pad 15. A hemispherical groove is formed on the upper surface of the pressure-bearing pad 14. The pressure-bearing pad 14 and the buffer pad 15 are rotatably connected. A protrusion 16 is provided on the lower surface of the pressure-bearing pad 14, and a groove 17 is formed on the upper surface of the buffer pad 15. The protrusion 16 is inserted into the groove 17. The protrusion 16 and the groove 17 are clearance-fitted to prevent misalignment between the pressure-bearing pad 14 and the buffer pad 15. In this embodiment, both the protrusion 16 and the groove 17 are disc-shaped. A limiting post is provided on the lower surface of the buffer pad 15. The limiting post is inserted into the throat liner 22 to facilitate the placement of the buffer pad 15.

[0039] In this embodiment, the pressure-bearing pad 14 is made of a metal material, such as stainless steel, and the buffer pad 15 is made of polytetrafluoroethylene (PTFE). PTFE is relatively soft and has an extremely low coefficient of friction, allowing the buffer pad 15 to make non-rigid contact with the upper surface of the throat liner 22. This enables more even transmission of the downward pressure force from the force-applying screw 11, while protecting the throat liner 22 from wear and damage. Furthermore, it significantly reduces the friction between the buffer pad 15 and the pressure-bearing pad 14, preventing the force-applying screw 11 from rotating and causing the buffer pad 15 to rotate.

[0040] An observation hole 10 is provided in the middle of the upper pressure plate 4, which corresponds to the throat liner 22 inside the nozzle housing 19. The staff can observe the alignment of the clamping assembly and the throat liner 22 through the observation hole 10, so as to make timely adjustments.

[0041] The practical method for using this tooling for bonding and curing obliquely cut retro-rocket nozzles is as follows: Figure 2As shown, the plug 21 and throat liner 22 are installed inside the nozzle housing 19. The plug 21 is placed on the step on the inner wall of the nozzle housing 19, and the throat liner 22 is pressed against the outer edge of the upper surface of the plug 21. The outer wall of the throat liner 22 is bonded to the inner wall of the nozzle housing 19. The outer edge 20 of the nozzle housing 19 is inserted into the slot 6 of the clamping plate 2 through the clamping groove 7. The clamping block 3 is placed on the clamping plate 2 and pressed against the nozzle housing 19 by the connecting rod 9, thereby fixing the nozzle housing 19. The pressure-bearing pad 14 and the buffer pad 15 are placed on the throat liner 22. Next, install the pressure plate 4 on the connecting rod 9, and use the handle 12 to rotate the force-applying screw 11 into the threaded through hole 5 so that the lower end of the force-applying screw 11 abuts against the hemispherical groove of the pressure pad block 14. Then, use a torque wrench to apply force to the nut 13 on the force-applying screw 11 to adjust the clamping force during the bonding and curing of the nozzle to the designed clamping force. During the clamping process, observe the alignment of the clamping assembly and the throat liner 22 in real time through the observation hole 10, and observe whether there is excess glue overflowing on the bonding surface of the nozzle housing 19 and the throat liner 22. Remove the excess glue overflowing.

[0042] This application adopts a slotted design that facilitates product installation. Through the tightening force coaxial with the bonding cone surface, the nozzle housing is bonded more conveniently and quickly. At the same time, the field of vision around and above is unobstructed, the bonding process is clearer and more controllable, and the removal of excess adhesive is also easier than existing bonding conditions. In addition, it does not use the threads inside the nozzle housing for fastening, avoiding wear on the assembly surface and significantly improving the bonding quality of the nozzle. It is suitable for bonding and curing most irregularly shaped oblique-cut retro-rockets nozzles.

[0043] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A tooling for bonding and curing obliquely cut retro-rocket nozzles, characterized in that: Includes a fixed base (1) and an upper pressure plate (4); The fixing seat (1) is used to fix the nozzle housing (19) so that the nozzle housing (19) is arranged vertically; The upper pressure plate (4) is installed above the fixed base (1) through the connector. The upper pressure plate (4) has a threaded through hole (5). The threaded through hole (5) is arranged obliquely along the axis of the bonding surface between the throat liner (22) and the nozzle housing (19). A pressing component for pressing the throat liner (22) onto the nozzle housing (19) is threaded on the threaded through hole (5). The clamping assembly includes a force-applying screw (11) and a pad assembly. The force-applying screw (11) is threadedly connected to the threaded through hole (5). One end of the force-applying screw (11) is hemispherical. The pad assembly has a hemispherical groove that matches one end of the force-applying screw (11). One end of the force-applying screw (11) abuts against the hemispherical groove of the pad assembly, so that the pad assembly presses the throat liner (22) against the nozzle housing (19). A thickening block (18) is provided on the upper pressure plate (4), and the threaded through hole (5) is opened on the thickening block (18); The thickened block (18) is trapezoidal and has an inclined surface perpendicular to the threaded through hole (5).

2. The tooling for bonding and curing obliquely cut retrorockets nozzles according to claim 1, characterized in that: The pad assembly includes a pressure pad (14) and a buffer pad (15), the hemispherical groove is formed on the pressure pad (14), and the buffer pad (15) is in non-rigid contact with the throat liner (22).

3. The tooling for bonding and curing obliquely cut retrorockets nozzles according to claim 2, characterized in that: The pressure-bearing pad (14) and the buffer pad (15) are rotatably connected. The pressure-bearing pad (14) is provided with a protrusion (16), and the buffer pad (15) is provided with a groove (17). The protrusion (16) is inserted into the groove (17). The protrusion (16) and the groove (17) are fitted with a clearance to prevent misalignment between the pressure-bearing pad (14) and the buffer pad (15).

4. The tooling for bonding and curing obliquely cut retro-rocket nozzles according to claim 3, characterized in that: The pressure-bearing pad (14) is made of metal, and the buffer pad (15) is made of polytetrafluoroethylene.

5. The tooling for bonding and curing obliquely cut retrorockets nozzles according to any one of claims 1 to 4, characterized in that: The fixing base (1) includes a clamping plate (2) and a clamping block (3). One end of the clamping plate (2) has an inwardly opening (6) and a groove (7) is opened in the opening (6). The outer edge (20) of the nozzle housing (19) can be inserted into the groove (7) of the opening (6). The clamping block (3) is detachably connected to one end of the clamping plate (2) with the opening (6). The clamping block (3) is used to press against the nozzle housing (19) to fix the nozzle housing (19).

6. The tooling for bonding and curing obliquely cut retrorockets nozzles according to claim 5, characterized in that: The connector includes a connecting rod (9) perpendicular to the card plate (2), and a pressing hole (8) is opened on the card block (3). The lower end of the connecting rod (9) passes through the pressing hole (8) and is connected to the card plate (2). The connecting rod (9) abuts against the inner wall of the pressing hole (8) so that the card block (3) abuts against the nozzle housing (19).

7. The tooling for bonding and curing obliquely cut retrorockets nozzles according to any one of claims 1 to 4, characterized in that: An observation hole (10) is provided on the upper pressure plate (4) for observing the alignment of the clamping assembly with the throat liner (22).

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