A large-size parallel rocket engine assembly device and its usage method

Abstract

A large-size parallel rocket engine assembly device and its usage method mainly consist of four parts: a frame reinforcing ring, a support adjustment device, an engine attitude adjustment trolley, and a contour-following operation platform. This invention uses the frame reinforcing ring as the assembly benchmark for the parallel engines. After the frame reinforcing ring is elevated to an appropriate height using the support adjustment device, the engine attitude adjustment trolley's docking posture is adjusted to achieve parallel docking of individual engines one by one. After parallel docking, the contour-following operation platform is assembled to enable high-altitude operations for the operator. The parallel rocket engine assembly device and usage method described in this invention, through reasonable structural and process design, ensures the accuracy, stability, and reliability of the parallel engine assembly process, significantly improving the efficiency and quality of single-engine parallel docking. It features convenient and reliable operation and strong practicality.

Description

Technical Field

[0001] This invention relates to a process equipment for parallel assembly of engines, and particularly to a combination assembly device required for parallel assembly of large-size engines. Background Technology

[0002] Liquid rocket engines are typically assembled vertically, with the thrust chamber nozzle facing downwards. Components such as the gyratory mechanism and frame are assembled from bottom to top, with the thrust chamber nozzle resting on the ground without additional support. However, as rocket engine thrust increases, parallel assembly of engines becomes more common. In parallel assembly, individual engines are no longer assembled vertically but at an eccentric angle, making it impossible to directly place them on the ground or perform multiple engine inspections and tests while suspended in mid-air. Furthermore, the assembly method of using the engine as the "stator" and the frame as the "moving element" in a multi-engine parallel configuration is clearly very difficult. Summary of the Invention

[0003] The technical problem solved by this application is to overcome the shortcomings of the prior art and provide a large-size parallel rocket engine assembly device and its usage method. Based on the assembly concept of engine suspension and parallel assembly, a fixing device, a support device, an attitude adjustment device, and an operating platform are designed and manufactured to realize the operation process of engine suspension and parallel assembly.

[0004] For the assembly of parallel rocket engines, a solution was proposed to achieve the suspended parallel connection of engines using a combined assembly device. This device involves suspending and fixing the engine frame, and independently adjusting and docking each engine with the frame. After docking, the parallel engines are suspended in the air, allowing for relevant inspections and tests. After parallel docking, a combined working platform provides operators with a more comfortable working height, avoiding the significant risk of falling while climbing the engines or ladders. After assembly, the engines are transported by vehicle along with the assembly device (frame reinforcing ring).

[0005] The technical solution provided in this application is as follows:

[0006] In the first aspect, a large-size parallel rocket engine assembly device is disclosed, including a frame reinforcing ring, a support adjustment device, an engine attitude adjustment trolley, and a contouring operation platform; the frame reinforcing ring is connected to the top of multiple support adjustment devices and is used to fix the engine frame; the engine attitude adjustment trolley is used to transport the engine body to the bottom of the engine frame, adjust the attitude of the engine body, and move the engine body upward; after the engine body is docked with the engine frame, the contouring operation platform is installed on the support adjustment device to form the operation platform.

[0007] The frame reinforcing ring includes an annular body, which is a polygonal annular structure. An engine connecting plate is connected to the upper inner side of the annular body. The engine connecting plate is used to install the engine frame. A support device connecting plate is connected to the lower outer side of the annular body. The support device connecting plate is used to connect a support adjustment device.

[0008] The support adjustment device includes multiple sets of triangular pyramid structures. Each set of triangular pyramid structures includes a fixed ladder, a transition ladder, and a support ladder connected sequentially from bottom to top. The support ladder includes a support body and a threaded shaft. One end of the threaded shaft is vertically slidably connected to the support body, and the other end is connected to the frame reinforcing ring, so that the height of the support ladder is adjustable.

[0009] The supporting body includes a bracket, a rotating sleeve, a thrust bearing, and a threaded sleeve. One end of the bracket is fixedly connected to a transition ladder, and the other end is connected to a central cylinder. The threaded shaft is inserted into the central cylinder, and the threaded shaft and the central cylinder move along the axis of the central cylinder. The threaded sleeve is threadedly connected to the outside of the threaded shaft and is located above the central cylinder. The thrust bearing is sleeved outside the threaded shaft and positioned between the threaded sleeve and the central cylinder. The rotating sleeve is sleeved outside the threaded shaft, and a force-applying handle is connected to the outside of the rotating sleeve. A reversing mechanism is provided between the force-applying handle and the threaded sleeve. The rotation of the rotating sleeve drives the rotation of the threaded sleeve through the reversing mechanism, and the rotation of the threaded sleeve drives the threaded shaft to move vertically up and down.

[0010] The threaded shaft is connected to a support shaft at its top. The support shaft is used to connect to the frame reinforcing ring. The outer circumferential surface of the threaded shaft is provided with an installation ring groove. The portion of the threaded shaft from the installation ring groove to the top of the threaded shaft is a connecting thread section with external threads on its outer circumferential surface. One end of the support shaft is provided with a connecting groove, which includes an internal thread section that gradually approaches the other end of the support shaft and a second chamber. The inner diameter of the internal thread section is smaller than the inner diameter of the second chamber. The inner wall surface of the internal thread section is provided with internal threads that mate with the connecting thread section. The internal thread section is screwed over the connecting thread section of the threaded shaft and located in the installation ring groove, so that there is a clearance fit between the threaded shaft and the support shaft. The support shaft is threadedly connected with a lock nut.

[0011] The reversing mechanism includes a rotating shaft seat, a rotating shaft, and a rotating baffle. The rotating shaft seat is connected to the upper surface of the force application handle. The rotating shaft seat is rotatably connected to the rotating baffle via the rotating shaft. The threaded sleeve has multiple toothed grooves machined on its outer shape. There is a locking part on each side of the rotating baffle. The locking part facing the rotating shaft is an inclined surface. Along the opposite direction of the two locking parts, the inclined surface gradually moves away from the rotating shaft. By rotating the rotating baffle, the locking parts on both sides of the rotating baffle can be locked into the toothed grooves on both sides of the rotating shaft.

[0012] The engine attitude adjustment trolley includes a base, a bottom slide, an upper slide, a turntable, and support columns. The height of the support columns is adjustable, and multiple support columns are provided. Multiple support columns are connected to the base to adjust the tilt angle of the base and drive the base to move up and down. The bottom slide is located on the upper surface of the base and is horizontally slidably connected to the base along the X direction. The upper slide is located on the upper surface of the bottom slide and is slidably connected to the bottom slide along the Y direction. The turntable is rotatably connected to the upper surface of the upper slide. The X direction is perpendicular to the Y direction, and the rotation axis of the turntable is perpendicular to both the X and Y directions.

[0013] Multiple support wheels are connected to the lower surface edge of the turntable, and the support wheels are in contact with the surface of the upper slide.

[0014] The contouring operation platform includes multiple split platforms, the number of which is the same as the number of triangular pyramid structures. Each split platform is installed between two adjacent triangular pyramid structures. Each split platform includes an aluminum alloy bracket, a fixed pedal, a flip pedal, and casters. The casters are installed at the bottom of the aluminum alloy bracket, which is equipped with a locking device for locking the casters. The fixed pedal is fixedly connected to the top of the aluminum alloy bracket, and a flip pedal is rotatably connected to each end of the top of the aluminum alloy bracket. When the contouring operation platform is idle, the flip pedal rotates to a vertical position. After the aluminum alloy bracket is assembled between two adjacent triangular pyramid structures, the flip pedal rotates downward and rests against the upper surface of the transition ladder of the support and adjustment device, and is then connected and fixed.

[0015] Secondly, a method for using a large-size parallel rocket engine assembly device is disclosed, including:

[0016] Hoist the engine frame and secure it to the frame reinforcing ring;

[0017] Pre-adjust the four support adjustment devices and place the support adjustment devices in the four quadrants of the engine;

[0018] The frame reinforcement ring and engine frame are lifted as a whole, and the frame reinforcement ring is connected and tightened to the four support adjustment devices;

[0019] Place the engine body on the turntable of the engine attitude adjustment trolley;

[0020] Push the engine attitude adjustment trolley to the bottom of the engine frame, adjust the attitude of the engine body through the engine attitude adjustment trolley 3, and connect the engine body to the engine frame.

[0021] Remove the engine tilting trolley, assemble the contouring operation platform, and connect and secure it.

[0022] Operators work on a contour-following platform to assemble the engine and obtain the assembled engine.

[0023] After assembly, the frame reinforcing ring and engine are lifted as a whole, and the frame reinforcing ring is connected and secured to the transport box before being loaded and transported.

[0024] In summary, this application includes at least the following beneficial technical effects:

[0025] 1. By using the frame reinforcing ring and support adjustment device to suspend and support the engine frame at an appropriate height, and using the frame as the assembly benchmark, the individual engines can be assembled one by one. This reduces the assembly difficulty and ensures that the attitude and position of the parallel engines are convenient for subsequent testing and inspection.

[0026] 2. Suspended engine mounting allows the engine to be suspended, thus preventing the thin-walled engine thrust chamber from contacting the ground and avoiding nozzle deformation due to its own weight.

[0027] 3. Utilizing the engine attitude adjustment trolley, the engine can be lifted and positioned at any height, orientation, and angle within the required range, with excellent fine-tuning capabilities. Its operational stability and convenience far surpass those of engine docking via hoisting methods.

[0028] 4. The contour-following operation platform designed in this invention provides operators with a suitable assembly operation height. By tightly surrounding the outer contour of the parallel engine after docking, it enables operators to get as close as possible to the engine assembly area, avoiding the risk of falling during torque tightening, conduit preparation and inspection and testing, and improving the convenience and comfort of operation. Attached Figure Description

[0029] Figure 1 Assembly drawing for the frame reinforcing ring, support adjustment device and engine attitude adjustment trolley;

[0030] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the frame reinforcing ring of the present invention;

[0032] Figure 4 This is a schematic diagram of the structure of the support adjustment device of the present invention;

[0033] Figure 5 This is a schematic diagram of the support ladder in the support adjustment device of the present invention;

[0034] Figure 6 Figure a is a schematic diagram of the reversing mechanism, and Figure b is a schematic diagram of the engagement between the rotating baffle and the tooth groove;

[0035] Figure 7 This is a schematic diagram of the structure of the engine attitude adjustment vehicle of the present invention;

[0036] Figure 8 This is a schematic diagram of the contouring operation platform of the present invention.

[0037] Explanation of reference numerals: 1. Frame reinforcing ring; 2. Support adjustment device; 3. Engine attitude adjustment trolley; 4. Contour-following operation platform;

[0038] 11. Circular main body; 12. Engine connecting plate; 13. Support device connecting plate; 14. Safety fence; 15. Safety rope connecting plate;

[0039] 21. Fixed ladder; 22. Transition ladder; 23. Supporting ladder;

[0040] 231. Bracket; 232. Threaded shaft; 233. Rotating sleeve; 2331. Force application handle; 2332. Shaft seat; 2333. Shaft; 2334. Rotating baffle; 234. Thrust bearing; 235. Threaded sleeve; 2351. Gear groove; 236. Support shaft; 237. Locking nut;

[0041] 31. Forklift connection plate; 32. Base; 33. Bottom slide; 34. Upper slide; 35. Turntable; 36. Support column; 37. Control console;

[0042] 41. Aluminum alloy bracket; 42. Fixed pedal; 43. Flip pedal; 44. Casters; 45. Locking device. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments disclosed in the present invention will be described in further detail below with reference to the accompanying drawings.

[0044] This application discloses a large-size parallel rocket engine assembly device. This assembly device is suitable for large multi-engine parallel rocket engines. Due to the constraints of the engine's own condition and assembly process, the engine cannot be placed on the ground during assembly and must be assembled in mid-air. Figure 1 and Figure 2 As shown, its structure mainly consists of four parts: a frame reinforcing ring 1, a support and adjustment device 2, an engine attitude adjustment trolley 3, and a contouring operation platform 4. Using the frame reinforcing ring 1 as the assembly benchmark for parallel engines, the support and adjustment device 2 elevates the frame reinforcing ring 1 to an appropriate height. The engine attitude adjustment trolley 3 is then adjusted to achieve parallel docking of individual engines one by one. After parallel docking, the contouring operation platform 4 is assembled to enable the operator to perform high-altitude work. Among them:

[0045] like Figure 3As shown, the main body of the frame reinforcing ring 1 is made of rectangular square tubes welded together. It is used to connect and fix the engine (or frame) and improve the rigidity of the engine frame. Its main body is made of: ring body 11, engine connecting plate 12, support device connecting plate 13, safety fence 14, and safety rope connecting plate 15 welded together. The welding dimensions of each joint of the gantry frame are as follows. The annular body 11 is a polygonal annular structure made of rectangular square tubes welded together. The engine connecting plate 12 and the support device connecting plate 13 are welded to the upper and lower end faces of the annular body 11, respectively. The engine connecting plate 12 is used to fix the engine frame. The support device connecting plate 13 is used to connect the support adjustment device 2 when the engine is assembled in parallel, and to connect the transport box when the engine is transported as a whole. The safety fence 14 is installed on the upper end of the frame reinforcing ring 1. The safety fence 14 is equipped with a tool box to prevent operators and tools from falling from height and causing injury when the engine is assembled in parallel. The safety fence can be removed during transportation to reduce the height of the transported goods. The safety rope connecting plate 15 is installed on the side of the frame reinforcing ring 1, and the other end is connected to the operator to avoid and reduce the risk of falling from height and injury.

[0046] like Figure 4 As shown, the support adjustment device 2 is a triangular pyramid structure used to support the frame reinforcing ring 1. Each group consists of four pieces, distributed in four quadrants during use. A ratchet mechanism levels the frame reinforcing ring 1, thus keeping the parallel engines mounted on it horizontal. The support adjustment device 2 mainly consists of a fixed ladder 21, a transition ladder 22, and a support ladder 23. Footboards are welded to the outside of the fixed ladder 21, transition ladder 22, and support ladder 23 for manual climbing. The fixed ladder 21 serves as the foundation for the support adjustment device 2, supporting the transition ladder 22 and support ladder 23 above and the ground below. A crossbeam is installed at an appropriate height for forklift transport. The transition ladder 22 supports the support ladder 23 above and connects to the fixed ladder 21 below. Different sizes of transition ladder 22 can be replaced according to the assembly height requirements of the parallel engines. The support ladder 23 supports the frame reinforcing ring 1 above and connects to the transition ladder 22 below. Its support height can be adjusted via a ratchet mechanism.

[0047] like Figure 5 , Figure 6As shown in Figures a and b, the main structure of the support ladder 23 consists of: bracket 231, threaded shaft 232, rotating sleeve 233, thrust bearing 234, threaded sleeve 235, support shaft 236, and locking nut 237. A force-applying handle 2331 and a reversing mechanism are respectively provided on the outside and upper end of the rotating sleeve 233 to realize the raising and lowering of the height of the support ladder 23. One end of the bracket 231 is fixedly connected to the transition ladder 22, and the other end is connected to a central cylinder. A threaded shaft 232 is inserted into the central cylinder, and the threaded shaft 232 and the central cylinder move along the axis of the central cylinder. A threaded sleeve 235 is threadedly connected to the outside of the threaded shaft 232, and the threaded sleeve 235 is located above the central cylinder. A thrust bearing 234 is sleeved outside the threaded shaft 232 and positioned between the threaded sleeve 235 and the central cylinder. A rotating sleeve 233 is sleeved outside the threaded shaft 232. The reversing mechanism includes a rotating shaft seat 2332, a rotating shaft 2333, and a rotating baffle 2334. A force application handle 233... 1. Fixedly connected to the outer wall of the rotating sleeve 233, the upper surface of the force-applying handle 2331 is provided with a rotating shaft seat 2332. The rotating shaft seat 2332 is rotatably connected to a rotating baffle 2334 via a rotating shaft 2333. Each side of the rotating baffle 2334 has a locking part. The threaded sleeve 235 has multiple toothed grooves 2351 machined on its outer surface. By rotating the rotating baffle 2334, the locking parts on both sides of the rotating baffle 2334 can be locked into the toothed grooves on both sides of the rotating shaft 2333. The side of the locking part facing the rotating shaft 2333 is inclined, and the inclined surface gradually moves away from the rotating shaft 2333 along the opposite direction of the two locking parts. The rotating baffle 2334 is then moved to... Figure 6 When the sleeve 233 is in the indicated position, rotating the sleeve 233 clockwise causes the rotating baffle 2334 to slip out of the tooth groove. Rotating the sleeve 233 counterclockwise causes the rotating baffle 2334 to push the threaded sleeve 235 clockwise, thus moving the threaded shaft 232 upwards or downwards. When the rotating baffle 2334 is moved to the other side, rotating the sleeve 233 counterclockwise causes the rotating baffle 2334 to slip out of the tooth groove. Rotating the sleeve 233 clockwise causes the rotating baffle 2334 to push the threaded sleeve 235 clockwise, thus moving the threaded shaft 232 and the rotating baffle 2334 to the indicated position. Figure 6 The direction of movement is opposite at the indicated position. With the above settings, the rotating sleeve 233 rotates, driving the thrust bearing 234 to rotate, and the rotation of the thrust bearing 234 drives the threaded shaft 232 to move vertically up and down.

[0048] The outer circumferential surface of the threaded shaft 232 is provided with an mounting annular groove. The portion from the mounting annular groove to the top of the threaded shaft 232 is a connecting thread section with external threads on its outer circumferential surface. The outer diameter of the connecting thread section is larger than the outer diameter of the threaded shaft 232 at the mounting annular groove position. One end of the support shaft 236 is provided with a connecting groove, which includes an internal thread section gradually approaching the other end of the support shaft 236 and a second chamber. The inner diameter of the internal thread section is smaller than the inner diameter of the second chamber. The inner wall surface of the internal thread section is provided with internal threads that mate with the connecting thread section. The internal thread section is screwed over the connecting thread section of the threaded shaft 232 and is located in the mounting annular groove. The width of the mounting annular groove is smaller than the height of the second chamber. When the internal thread section is located in the mounting annular groove, the support shaft 236 and the threaded shaft 232 are in clearance fit. During docking, the support shaft 236 can be wobbled to make minor position adjustments. After the support shaft 236 passes through the support device connecting plate 13 connected to the frame reinforcing ring 1, the locking nut 237 is tightened onto the support shaft 236, thereby fixing the support ladder 23 to the frame reinforcing ring 1.

[0049] like Figure 7As shown, the engine tilting trolley 3 consists of: a forklift connecting plate 31, a base 32, a bottom slide 33, an upper slide 34, a turntable 35, a support column 36, and a control console 37. The forklift connecting plate 31 is integrated with the base 32 and used for the overall rotation of the engine attitude adjustment trolley 3. The bottom slide 33 and the upper slide 34 are used to adjust the horizontal dimensions in the X and Y directions during engine docking. The X direction is perpendicular to the Y direction. The bottom slide 33 is located on the upper surface of the base 32 and is horizontally slidably connected to the base 32 along the X direction. The upper slide 34 is located on the upper surface of the bottom slide 33 and is slidably connected to the bottom slide 33 along the Y direction. The turntable 35 is used to adjust the C-direction during engine docking. The turntable 35 is rotatably connected to the upper surface of the upper slide 34. The rotation axis of the turntable 35 is perpendicular to the X and Y directions. Four support columns 36 are provided. The four support columns 36 are evenly distributed and connected to the edge of the base 32. The support columns 36 and the control console 37 are hydraulically connected to make the height of the support columns 36 adjustable. Through the control console, the four support columns 36 can move in tandem or individually to realize the Z-direction height adjustment and A-direction pitch adjustment during engine docking. The turntable 35 (top turntable) is a rotating disk that can be adjusted clockwise and counterclockwise (C-axis) according to the actual angle requirements during engine installation. After the engine pre-alignment is completed, the first-level turntable can be positioned using a locking device before proceeding to the next step. The bottom slide 33 and the top slide 34 are displacement adjustment platforms in the X and Y directions, respectively. Linear guides are used to determine the displacement path, and lead screws are used as the displacement power. The X and Y displacement lengths are adjusted by rotating the handwheel in both directions. The amount of displacement is visually determined based on the docking conditions. The trolley support column 36 and the control console 37 contain four sets of hydraulic cylinders and one hydraulic control unit, providing power for vertical lifting (Z-axis) and angle adjustment (A-angle). The hydraulic cylinders are located at the four corners of the fixture, and independent lifting and lowering of the cylinders are achieved using four independent manual directional valves. During workpiece docking, hole alignment is performed visually. The hydraulic cylinders have built-in stroke scales for easy calculation of relative positions. In order to meet the requirements of safe docking and installation accuracy, and to ensure reliable and stable operation under extreme conditions of full load and maximum tilt angle, multiple support wheels are designed at the lower surface edge of the turntable 35. The support wheels are in contact with the surface of the upper slide table 34, so that the turntable 35 is distributed with force.

[0050] like Figure 8As shown, the contouring operation platform 4 surrounds the parallel engine and is used for operators to work at height. The contouring operation platform 4 consists of four separate platforms. When the contouring operation platform 4 is not in use, it is in a separate structure. After the parallel engine assembly process is completed, the four separate platforms are assembled together and connected and fixed to the support and adjustment device 2 to form a stable structure. The main structure of each separate platform consists of: an aluminum alloy bracket 41, a fixed pedal 42, a tilting pedal 43, a movable caster 44, and a locking device 45. The platform consists of four aluminum alloy brackets 41, the inner contour of which is modeled after the engine is connected in parallel. The height and external dimensions are determined in coordination with the engine assembly and operation requirements. A fixed pedal 42 is fixedly connected to the top of the aluminum alloy bracket 41. A flip pedal 43 is rotatably connected to each end of the top of the aluminum alloy bracket 41. When the contoured operating platform 4 is idle, the flip pedal 43 rotates to a vertical position. After the aluminum alloy brackets 41 are assembled in place, the flip pedal 43 rotates downwards and rests against the upper surface of the transition ladder 22 in the support adjustment device 2, and is then fixed. After connection, the four aluminum alloy brackets 41 are assembled into a single unit, with the fixed pedal 42 and flip pedal 43 forming a flat operating surface above, allowing operators to move freely. Movable casters 44 are connected to the bottom of the aluminum alloy brackets 41 to facilitate movement. A locking device 45 is used to lock the movable casters 44 after the aluminum alloy brackets 41 are moved into place, thus fixing the position of the aluminum alloy brackets 41.

[0051] A method for using a large-size parallel rocket engine assembly device includes the following steps:

[0052] Hoist the engine frame and connect and secure the engine frame to the frame reinforcing ring 1;

[0053] Pre-adjust the four-quadrant support adjustment device 2, and place the support adjustment device 2 in the four quadrants of the engine;

[0054] The reinforcing ring 1 of the overall lifting frame and the engine frame are connected and fastened to the four support and adjustment devices 2;

[0055] Hoist the engine body and place it on the engine attitude adjustment trolley turntable 3;

[0056] The engine attitude adjustment trolley 3 is pushed into the support range of the four-way support adjustment device 2 (below the engine frame);

[0057] The engine body posture is adjusted by the engine attitude adjustment trolley 3 and the engine body is docked and connected to the engine frame.

[0058] Remove the engine tilting trolley 3, assemble the contouring operation platform 4 and connect and secure it;

[0059] Operators work at height on contour-following platform 4 to assemble the engine and obtain a fully assembled engine; the engine assembly work includes pipe configuration and connection, gas cylinder connection, etc.

[0060] After assembly, the frame reinforcing ring 1 and the engine are lifted as a whole, and the frame reinforcing ring 1 is connected and secured to the transport box before being loaded and transported.

[0061] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

[0062] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.

Claims

1. A large-size parallel rocket engine assembly device, characterized in that: It includes a frame reinforcing ring (1), a support adjustment device (2), an engine attitude adjustment trolley (3), and a contouring operation platform (4); the frame reinforcing ring (1) is connected to the top of multiple support adjustment devices (2), and the frame reinforcing ring (1) is used to fix the engine frame; the engine attitude adjustment trolley (3) is used to transport the engine body to the bottom of the engine frame, and to adjust the attitude of the engine body and drive the engine body to move upward; After the engine body is connected to the engine frame, the contouring operation platform (4) is installed on the support adjustment device (2) to form the operation platform; The frame reinforcing ring (1) includes an annular body (11), which is a polygonal annular structure. The upper inner side of the annular body (11) is connected to an engine connecting plate (12), which is used to install the engine frame. The lower outer side of the annular body (11) is connected to a support device connecting plate (13), which is used to connect a support adjustment device (2). The support adjustment device (2) includes multiple sets of triangular pyramid structures. Each set of triangular pyramid structures includes a fixed ladder (21), a transition ladder (22), and a support ladder (23) connected from bottom to top. The support ladder (23) includes a support body and a threaded shaft (232). One end of the threaded shaft (232) is vertically slidably connected to the support body, and the other end is connected to the frame reinforcing ring (1) so that the height of the support ladder (23) is adjustable. The engine attitude adjustment trolley (3) includes a base (32), a bottom slide (33), an upper slide (34), a turntable (35), and support columns (36). The height of the support columns (36) is adjustable. Multiple support columns (36) are provided and connected to the base (32) to adjust the tilt angle of the base (32) and drive the base (32) to move up and down. The bottom slide (33) is located on the upper surface of the base (32) and is horizontally connected to the base (32) along the X direction. The upper slide (34) is located on the upper surface of the bottom slide (33) and is horizontally connected to the bottom slide (33) along the Y direction. The turntable (35) is rotatably connected to the upper surface of the upper slide (34). The X direction is perpendicular to the Y direction, and the rotation axis of the turntable (35) is perpendicular to the X and Y directions. The contouring operation platform (4) includes multiple split platforms, the number of which is the same as the number of triangular pyramid structures. Each split platform is installed between two adjacent triangular pyramid structures. Each split platform includes an aluminum alloy bracket (41), a fixed pedal (42), a flip pedal (43), and a movable caster (44). The movable caster (44) is installed at the bottom of the aluminum alloy bracket (41). The aluminum alloy bracket (41) is provided with a locking device (45) for locking the movable caster (44). The fixed pedal (42) is fixedly connected to the top of the aluminum alloy bracket (41). A flip pedal (43) is rotatably connected to each end of the top of the aluminum alloy bracket (41). When the contouring operation platform (4) is idle, the flip pedal (43) rotates to a vertical position. After the aluminum alloy bracket (41) is assembled between two adjacent triangular pyramid structures, the flip pedal (43) rotates downward and rests against the upper surface of the transition ladder (22) of the support adjustment device (2), and is connected and fixed.

2. The large-size parallel rocket engine assembly device according to claim 1, characterized in that: The supporting body includes a bracket (231), a rotating sleeve (233), a thrust bearing (234), and a threaded sleeve (235). One end of the bracket (231) is fixedly connected to the transition ladder (22), and the other end is connected to a central cylinder. A threaded shaft (232) is inserted into the central cylinder, and the threaded shaft (232) and the central cylinder move along the axial direction of the central cylinder. The threaded sleeve (235) is threadedly connected to the outside of the threaded shaft (232), and the threaded sleeve (235) is located above the central cylinder. The thrust bearing... (234) is sleeved outside the threaded shaft (232) and positioned between the threaded sleeve (235) and the central cylinder. The rotating sleeve (233) is sleeved outside the threaded shaft (232). A force-applying handle (2331) is connected to the outside of the rotating sleeve (233). A reversing mechanism is provided between the force-applying handle (2331) and the threaded sleeve (235). The rotation of the rotating sleeve (233) drives the threaded sleeve (235) to rotate through the reversing mechanism. The rotation of the threaded sleeve (235) drives the threaded shaft (232) to move vertically up and down.

3. The large-size parallel rocket engine assembly device according to claim 1, characterized in that: The threaded shaft (232) is connected to a support shaft (236) at its top. The support shaft (236) is used to connect the frame reinforcing ring (1). The outer circumferential surface of the threaded shaft (232) is provided with an mounting ring groove. The portion from the mounting ring groove of the threaded shaft (232) to the top of the threaded shaft (232) is a connecting thread section with external threads on its outer circumferential surface. One end of the support shaft (236) is provided with a connecting groove. The connecting groove includes an internal thread section that gradually approaches the other end of the support shaft (236) and a second chamber. The inner diameter of the internal thread section is smaller than the inner diameter of the second chamber. The inner wall surface of the internal thread section is provided with internal threads that mate with the connecting thread section. The internal thread section is screwed over the connecting thread section of the threaded shaft (232) and located in the mounting ring groove so that there is a clearance fit between the threaded shaft (232) and the support shaft (236). The support shaft (236) is threadedly connected with a lock nut (237).

4. The large-size parallel rocket engine assembly device according to claim 2, characterized in that: The reversing mechanism includes a rotating shaft seat (2332), a rotating shaft (2333), and a rotating baffle (2334). The rotating shaft seat (2332) is connected to the upper surface of the force application handle (2331). The rotating shaft seat (2332) is rotatably connected to the rotating baffle (2334) through the rotating shaft (2333). The threaded sleeve (235) has multiple toothed grooves (2351) machined on its outer shape. There is a locking part on each side of the rotating baffle (2334). The side of the locking part facing the rotating shaft (2333) is an inclined surface. Along the opposite direction of the two locking parts, the inclined surface gradually moves away from the rotating shaft (2333). By rotating the rotating baffle (2334), the locking parts on both sides of the rotating baffle (2334) can be locked into the toothed grooves on both sides of the rotating shaft (2333).

5. The large-size parallel rocket engine assembly device according to claim 1, characterized in that: Multiple support wheels are connected to the lower surface edge of the turntable (35), and the support wheels are in contact with the surface of the upper slide (34).

6. A method of using a large-size parallel rocket engine assembly device according to any one of claims 1-5, characterized in that, include: Hoist the engine frame and connect and fasten the engine frame to the frame reinforcing ring (1); Pre-adjust the four-quadrant support adjustment device (2) and place the support adjustment device (2) in the four quadrants of the engine; The frame reinforcing ring (1) and engine frame are lifted as a whole, and the frame reinforcing ring (1) is connected and fastened to the four support adjustment devices (2); Place the engine body on the turntable of the engine attitude adjustment trolley (3); Push the engine attitude adjustment trolley (3) to the bottom of the engine frame, adjust the attitude of the engine body through the engine attitude adjustment trolley 3 and connect the engine body to the engine frame; Remove the engine orientation adjustment trolley (3), assemble the contouring operation platform (4) and connect and secure it; Operators climb on the contouring platform (4) to perform engine assembly work and obtain the assembled engine. After assembly, the frame reinforcing ring (1) and engine are lifted as a whole, and the frame reinforcing ring (1) is connected and secured to the transport box before being loaded and transported.

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