Liquid rocket engine assembly and transportation device and method thereof

Abstract

The present invention relates to an assembly and transportation device for a liquid rocket engine and a method thereof. Existing liquid rocket engines are assembled by hoisting installation, and the engine is placed horizontally in a special transport box during transportation. There is a risk of damaging the engine during assembly and transportation. The assembly and transportation device for a liquid rocket engine of the present invention includes a base bracket, wherein the top horizontal beams of a pair of "Π"-shaped frames of the base bracket are connected at both ends by a pair of upper beams spaced opposite to each other, the middle parts of the vertical beams on both sides of the pair of "Π"-shaped frames are connected by a pair of middle beams, and the lower ends of the vertical beams on both sides are connected by a pair of open beams, each vertical beam extends an open horizontal connecting end, and a pair of bottom beams spaced opposite to each other are provided on the pair of open beams, and a nozzle fixing device is provided on the bottom beam. The device of the present invention can not only realize random modular assembly of the engine with high assembly efficiency, but also can be directly transported with the device after assembly to avoid damage caused by the engine hoisting and flipping process.

Description

Technical Field

[0001] The present invention belongs to the technical field of rocket engine assembly, and in particular relates to an assembly and transportation device for a liquid rocket engine and a method thereof. Background Art

[0002] Liquid rocket engines have a complex structure, numerous components and pipelines, and large overall dimensions. During production and assembly, in-plant transportation, and long-distance transportation, they are prone to various bumps and structural component breakage problems. When assembling a liquid rocket engine, the engine is placed directly on the assembly site and assembled vertically based on the thrust chamber, or installed with a special assembly bracket; when transporting within the factory, the engine is directly lifted with a hook for transportation; when transporting over long distances, the engine is flipped to a horizontal state, placed in a special transport box, and fixed for long-distance transportation. This has the following disadvantages:

[0003] 1. Due to the large weight and outer contour of liquid rocket engines, the center of gravity and the geometric center do not coincide with each other. When placed directly on the ground, it is easy to overturn and cause engine damage.

[0004] 2. Liquid rocket engine assembly generally involves assembling other components on the basis of the thrust chamber. If the thrust chamber cannot be put in place, the assembly of other components cannot be carried out, affecting the assembly work.

[0005] 3. When transporting the engine within the factory, it is directly hoisted and transported. At this time, the engine hoisting position needs to be carefully selected, otherwise the hoisting process may easily damage the engine;

[0006] 4. After the engine is installed in the transport box, it needs to be flipped from a vertical position to a horizontal position. This requires special flipping tooling, which increases the complexity of the operation and is prone to damage to the engine during the flipping process.

[0007] 5. Different equipment and tooling are required during the engine assembly and transportation stages, resulting in high assembly and transportation costs. Summary of the Invention

[0008] In response to the above problems, the purpose of the present invention is to provide an assembly and transportation device for a liquid rocket engine and a method thereof, which integrates the assembly fixation and transportation fixation of the engine into one, not only realizing the random modular composition of the engine and high assembly efficiency; at the same time, after the assembly is completed, the engine can be directly transported with the device, avoiding the risk of damage to the engine during lifting and installation and flipping transportation.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] A liquid rocket engine assembly and transportation device includes a basic support, wherein the basic support includes a pair of "Π"-shaped frames arranged vertically at intervals relative to each other, the ends of the top horizontal beams of the pair of "Π"-shaped frames are connected by a pair of upper beams arranged horizontally at intervals relative to each other, the middle parts of the vertical beams on both sides of the pair of "Π"-shaped frames are connected by a pair of middle beams, and the lower ends of the vertical beams on both sides are connected by a pair of horizontally arranged open beams, the end of each vertical beam extends out of the connecting end of the open beam, and the pair of open beams are provided with a pair of bottom beams spaced opposite to each other, and the bottom beams are provided with a nozzle fixing device.

[0011] Furthermore, the nozzle fixing device includes a cone fixing frame sleeved on the lower end of the engine nozzle, and the cone fixing frame is arranged on the bottom crossbeam.

[0012] Furthermore, a pad is provided at the lower end of the cone-fixed tire frame, and the pad is located between the cone-fixed tire frame and the bottom crossbeam. Pads of different thicknesses are used to adjust the height of the cone-fixed tire frame to support the engine nozzle.

[0013] Furthermore, the lower ends of the vertical beams of the "Π"-shaped frame are connected to support bottom beams on both sides, and the support bottom beam is spaced apart from the bottom of the vertical beams of the "Π"-shaped frame.

[0014] Furthermore, the upper crossbeam is vertically intersected and connected with the horizontal crossbeam of the "Π"-shaped frame, the middle crossbeam is vertically intersected and connected with the vertical vertical beam of the "Π"-shaped frame, and the opening crossbeam is vertically intersected and connected with the vertical vertical beam of the "Π"-shaped frame; the bottom crossbeam is vertically intersected with the opening crossbeam.

[0015] Furthermore, the connecting ends of the vertical beams and horizontal beams of the "Π"-shaped frame, the connecting ends of the open beams and the vertical beams of the "Π"-shaped frame, and the connecting ends of the vertical beams of the "Π"-shaped frame and the bottom beams of the bracket are all provided with fixed ribs.

[0016] The present invention also provides a method for assembling a liquid rocket engine, comprising the following steps:

[0017] Step 1); a pair of base brackets are connected to a pair of upper cross beams to form an engine assembly bracket. First, the engine frame is installed on the upper cross beams, and then other engine components are installed in sequence;

[0018] Step 2); move the engine thrust chamber and the turbo pump with a horizontal cart from the opening at the lower end of the base bracket to the bottom of the engine frame for installation, and complete the assembly and inspection of the engine components;

[0019] Step 3); Install the opening beam to the bottom opening of the base bracket, and then connect the bottom beam to the base bracket and the opening beam;

[0020] Step 4); Install the nozzle fixture on the bottom beam, and the upper end support sleeve of the nozzle fixture is arranged in the engine nozzle;

[0021] Step 5); Connect and fix the middle crossbeam to the base bracket to complete the engine fixed assembly.

[0022] Furthermore, the above step 4) also includes: when fixing the nozzle fixing device, first place the nozzle fixing device on the ground below the engine nozzle, so that the strip support plate of the nozzle fixing device is parallel to the bottom beam when placing it, and then rotate the nozzle fixing device 90°, lift it up and place it on the bottom beam, and fix the strip support plate to the bottom beam.

[0023] Furthermore, in the above step 4), pads of different thicknesses are provided at the lower end of the strip support plate to adjust the nozzle fixing device to fit tightly with the engine nozzle.

[0024] The present invention also provides a method for transporting a liquid rocket engine, comprising the following steps:

[0025] Step 1) Engine fixed assembly;

[0026] Including an assembly method of the above engine;

[0027] Step 2) After assembly is completed, it is directly loaded and transported.

[0028] The present invention adopts the above technical solution, which has the following advantages and effects:

[0029] (1) When assembling an engine, the device of the present invention can avoid the risk of overturning caused by placing the engine directly on the ground. The device of the present invention can realize modular assembly of the engine. When assembling the engine, the device of the present invention can be used as the assembly basis. There is no need to wait for the delivery of the thrust chamber or other components. The assembly of other components can be carried out in advance. During assembly, the engine assembly order can be reversed, which is highly flexible and improves the overall assembly efficiency of the engine.

[0030] (2) When assembling the engine, the thrust chamber and the turbo pump of the engine can be transported to the bottom of the engine frame using a horizontal cart for installation, thereby avoiding the problem of easy damage to the engine frame module during lifting and transportation.

[0031] (3) The device of the present invention can be directly hoisted during the transportation and lifting of the engine, thereby avoiding the safety risks brought by hoisting and transportation to the engine.

[0032] (4) The device of the present invention can not only realize the assembly of the engine, but also the engine assembled on the device can be integrated with the device for long-distance transportation, eliminating the engine flipping process and special transport box, not only avoiding the safety hazards caused by engine flipping, but also eliminating the need for special transport boxes, thereby reducing transportation costs.

[0033] (5) The device of the present invention can be used as both an assembly device for the engine and a fixing device for transporting the engine. During assembly, the engine is assembled from scratch based on the device. After the assembly is completed, the engine can be inspected on the device. After the assembly and inspection are completed, the engine can be directly transported. During transportation, the upper part of the engine is securely mounted on the upper crossbeam of the device, and the lower nozzle of the engine is securely supported by the nozzle fixing device, thereby avoiding damage to the engine caused by shaking and collision during long-distance transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the assembly and transportation device of the present invention.

[0035] Figure 2 It is a structural schematic diagram of the nozzle fixing device of the assembly and transportation device of the present invention.

[0036] Figure 3-Figure 8 It is a structural schematic diagram of the steps of assembling an engine for assembling a transport device according to the present invention.

[0037] The reference numerals in the figure are as follows: 1-base bracket, 2-upper crossbeam, 3-middle crossbeam, 4-bottom crossbeam, 5-opening crossbeam, 6-nozzle fixing device, 7-engine frame, 8-thrust chamber 9-turbo pump, 011-"Π"-shaped frame, 012-bracket bottom beam, 061-conical fixing tire frame, 062-pad, 0611-locking nut, 0612-conical fixing tire, 0613-strip support plate, 0614-fixed pipe column. DETAILED DESCRIPTION

[0038] The following will be described in detail with reference to the accompanying drawings to provide a clearer understanding of the objectives, features and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0039] The assembly and transportation device for a liquid rocket engine according to the present invention is an integrated device primarily constructed from a steel frame and several detachable structural components. The device comprises a frame structure comprising a base frame, the top, middle, and bottom of which are connected in sequence by an upper crossbeam, a middle crossbeam, and an open crossbeam. A bottom crossbeam is disposed in the middle of the open crossbeam, and a nozzle fixture for securing the engine nozzle is mounted on the bottom crossbeam. During assembly, the device can be assembled by first connecting the base frame, the top crossbeam, and one side of the open crossbeam. The engine's thrust chamber and turbopump can then be directly pushed into the device from one side of the open crossbeam, where they are not connected, onto the upper crossbeam. Finally, the other side of the open crossbeam and the bottom crossbeam are connected, and the nozzle fixture is secured to the bottom crossbeam to support and secure the engine nozzle, completing engine assembly. Finally, the middle crossbeam is connected to protect the engine's exterior. After assembly, the engine can be tested, and the device and engine can be transported directly after testing. By using the device of the present invention as an assembly basis, a liquid rocket engine can be assembled from scratch with high assembly efficiency. At the same time, all assembly and testing work can be completed on this device. After completing the assembly and testing work, this device can be directly loaded onto a truck for long-distance transportation as a transportation equipment, avoiding the risk of damage caused by changes in the engine assembly and transportation status.

[0040] like Figure 1 、 Figure 2 As shown. The present invention provides an assembly and transportation device for a liquid rocket engine, comprising a base support 1, comprising a pair of vertically spaced, opposed "Π"-shaped frames 011. The top horizontal beams of the pair of "Π"-shaped frames 011 are connected at both ends by a pair of horizontally spaced, opposed upper beams 2. The vertical beams on both sides of the pair of "Π"-shaped frames 011 are connected in the middle by a pair of middle beams 3. The lower ends of the vertical beams on both sides are connected by a pair of horizontally arranged open beams 5. The end of each vertical beam extends beyond the connection end of the open beam 5. The pair of open beams 5 are provided with a pair of spaced, opposed bottom beams 4. The bottom beams 4 are provided with a nozzle fixing device 6.

[0041] Specifically, the "Π"-shaped frame 011 of the basic support 1 is composed of a horizontal crossbeam and two vertical vertical beams. The horizontal crossbeam is connected to the top of the two vertical vertical beams to form a "Π"-shaped frame structure. The horizontal crossbeam and the vertical vertical beams are made of steel pipes, and the two are welded and connected to form the "Π"-shaped frame 011. A pair of "Π"-shaped frames 011 are vertically arranged on the bottom surface and relatively spaced apart. The relatively spaced pair of "Π"-shaped frames 011 are parallel to each other. Both ends of a pair of upper crossbeams 2 are connected to the top of the horizontal crossbeams of a pair of "Π"-shaped frames 011, and a pair of upper crossbeams 2 are fixed on the upper surface of the horizontal crossbeams, and the upper crossbeams 2 are made of channel steel. Each intermediate crossbeam 3 is connected at both ends to the middle of the vertical vertical beams on the same side of the two "Π"-shaped frames 011, and the intermediate crossbeam 3 is fixed on the outer surface of the vertical vertical beams, and the intermediate crossbeam 3 is made of angle steel. Each open crossbeam 5 is connected at both ends to the lower portion of the vertical beams on the same side of the two "Π"-shaped frames 011. The connection between the open crossbeam 5 and the vertical beams is spaced a distance from the bottom of the vertical beams, allowing for a sufficient gap between the open crossbeam 5 and the ground for connection to a pair of bottom crossbeams 4. The middle crossbeam 3 is made of steel pipe, while the bottom crossbeam 4 is a strip-shaped steel plate structure. Both ends of the bottom crossbeam 4 are connected to the open crossbeam 5 using bolts and nuts.

[0042] Furthermore, the nozzle fixing device 6 includes a cone fixing tire frame 061 sleeved on the lower end of the engine nozzle, and the cone fixing tire frame 061 is set on the bottom crossbeam 4.

[0043] Specifically, the cone mounting bracket 061 comprises a cone mounting bracket 0612 and a strip support plate 0613. The strip support plate 0613 is positioned at the bottom of the cone mounting bracket 0612. The cone mounting bracket 0612 is constructed of a truncated cone structure made of aviation foam. The interior of the cone is a cavity, providing a certain cushioning and support function. The outer surface of the cone mounting bracket 0612 features a stepped structure to prevent the cone mounting bracket from fitting tightly against the engine nozzle at the bottom of the engine, making it difficult to remove. The cone mounting bracket's outer shape matches the internal shape of the engine nozzle, and its dimensions are slightly smaller than the nozzle's internal shape, allowing the cone to fit over the nozzle and support it. The cone-shaped fixed tire frame and the strip support plate are connected to each other in an integrated structure. A fixed pipe column 0614 is sleeved in the central hole cavity of the cone-shaped fixed tire frame. The upper end of the fixed pipe column 0614 is threadedly connected to a locking nut 0611 with an extension to press and fix the upper surface of the cone-shaped fixed tire. The strip support plate 0613 at the bottom of the cone-shaped fixed tire frame 061 is used to be placed on the bottom beam 4 to support the cone-shaped fixed tire 0612.

[0044] Furthermore, a pad 062 is provided at the lower end of the cone-fixed tire frame 061, and the pad 062 is located between the cone-fixed tire frame 061 and the bottom crossbeam 4. Pads 062 of different thicknesses are used to adjust the height of the cone-fixed tire frame 061 to support the engine nozzle.

[0045] Specifically, pads 062 are positioned at both ends of the lower surface of the strip support plate 0613 at the lower end of the cone-shaped mounting bracket 6 to support the nozzle fixture 6. Since the nozzle fixture 6 is positioned upward from the lower end of the engine nozzle, a gap is created at the bottom of the nozzle fixture 6 as it moves upward. Pads 062 of varying thicknesses are used to fill this gap, ensuring that the nozzle fixture 6 can firmly support the engine nozzle after its upward movement. The pads are specifically positioned on the bottom crossbeam 4 at the lower sides of the strip support plate. The thickness of the pads 062 can be temporarily adjusted during assembly to accommodate the gap, allowing the height of the cone-shaped mounting bracket 061 to match the engine nozzle, ensuring a tight fit and support between the cone-shaped mounting bracket 061 and the engine nozzle.

[0046] Furthermore, the lower ends of the vertical beams of the "Π"-shaped frame 011 are connected to support bottom beams 012 on both sides, and the support bottom beams 012 are spaced apart from the bottoms of the vertical beams of the "Π"-shaped frame 011.

[0047] In order to increase the stability of the basic support 1, the two ends of each support bottom beam 012 are connected to the lower part of the vertical beam of the corresponding "Π"-shaped frame 011. There is a space between the connecting end of the support bottom beam 012 and the vertical beam and the bottom of the vertical beam, so that the support bottom beam 012 is separated from the ground by a certain space.

[0048] Of course, as a preference, the pair of bottom cross beams 4 can also be arranged on the bracket bottom beam 012 to support the nozzle fixing device 6. At this time, the two ends of the pair of bottom cross beams 4 are connected to the bracket bottom beam 012 at the lower end of each relatively arranged "Π"-shaped frame 011.

[0049] Furthermore, the upper crossbeam 2 is vertically intersected and connected with the horizontal crossbeam of the "Π"-shaped frame 011, the middle crossbeam 3 is vertically intersected and connected with the vertical vertical beam of the "Π"-shaped frame 011, and the opening crossbeam 5 is vertically intersected and connected with the vertical vertical beam of the "Π"-shaped frame 011; the bottom crossbeam 4 is vertically intersected with the opening crossbeam 5.

[0050] Furthermore, the connecting ends of the vertical beams and horizontal beams of the "Π"-shaped frame 011, the connecting ends of the open beams 5 and the vertical beams of the "Π"-shaped frame, and the connecting ends of the vertical beams of the "Π"-shaped frame 011 and the bracket bottom beams 012 are all provided with fixed ribs.

[0051] In order to increase the stability of the entire device, the connecting ends of the vertical beams, horizontal beams, bracket bottom beam 012 and open beam 5 are reinforced with fixed ribs. The fixed ribs are a right-angled triangle structure, and the fixed ribs are connected to each other by welding.

[0052] The present invention provides a method for assembling a liquid rocket engine, which is performed using the assembly and transportation device for the liquid rocket engine, and specifically includes the following steps:

[0053] Step 1) Bolt the base bracket 1 and the upper crossbeam 2 together to form an engine assembly bracket. Figure 3 On this basis, the engine assembly begins, first the engine frame 7 is installed on the upper crossbeam 2, and then the other engine components are installed in sequence.

[0054] Step 2) When installing the engine thrust chamber 8 and the turbo pump 9, a horizontal cart can be used to move them from the opening on one side of the base support to the bottom of the engine frame 7 for installation. Figure 4 As shown, the engine assembly and inspection work is completed in this state.

[0055] Step 3) After completing the engine assembly and testing, first install the opening beam 5 on the bottom opening of the base bracket 1, and then connect the bottom beam 4 with the base bracket 1 and the opening beam 5. Figure 5 shown.

[0056] Step 4) Figure 6 As shown, the cone-shaped fixing tire frame 061 is first placed under the engine nozzle. When placed, the strip support plate 0613 of the cone-shaped fixing tire frame 061 is parallel to the bottom cross beam 4, and the cone-shaped fixing tire 0612 at the upper end of the cone-shaped fixing tire frame 061 is located directly under the engine nozzle. Then gradually rotate 90 degrees to lift the strip support plate 0613. Both ends of the strip support plate 0613 are supported on the bottom cross beam 4. The height of the cone-shaped fixing tire 0612 is adjusted to form an effective fit support with the engine nozzle. A pad 062 is made according to the space between the strip support plate 0613 of the cone-shaped fixing tire frame 061 and the bottom cross beam 4. The space between the strip support plate 0613 and the bottom cross beam 4 is padded with the pad 062. The strip support plate 0613 and the bottom cross beam 4 are connected with a bolt and nut structure to complete the support and fixation of the entire nozzle fixing device 6 to the engine nozzle. Figure 7 shown.

[0057] Step 5) The middle cross beam 3 is connected and fixed to the base bracket 1 to securely fix the engine and complete the engine assembly. Figure 8 shown.

[0058] Again Figure 3-Figure 8The present invention also provides a method for transporting a liquid rocket engine, which specifically includes the following steps:

[0059] Step 1) Bolt the base bracket 1 and the upper crossbeam 2 together to form an engine assembly bracket. Then, start assembling the engine by first installing the engine frame 7 on the upper crossbeam 2, and then install other engine components in sequence.

[0060] Step 2) When installing the engine thrust chamber 8 and turbo pump 9, a horizontal cart can be used to move them from the side opening of the base support to the bottom of the engine frame 7 for installation. After installation, the engine assembly and inspection work is completed in this state.

[0061] Step 3) After completing the engine assembly and testing, first install the opening beam 5 on the bottom opening of the base bracket 1, and then connect the bottom beam 4 to the base bracket 1 and the opening beam 5 for installation.

[0062] Step 4) Place the cone-shaped fixed tire frame 061 under the engine nozzle first. When placing it, the strip support plate 0613 of the cone-shaped fixed tire frame 061 is parallel to the bottom cross beam 4, and the cone-shaped fixed tire 0612 at the upper end of the cone-shaped fixed tire frame 061 is located directly under the engine nozzle. Then gradually rotate it 90° to lift the strip support plate 0613. Both ends of the strip support plate 0613 are supported on the bottom cross beam 4. Adjust the height of the cone-shaped fixed tire 0612 to form an effective fit support with the engine nozzle. Make a pad 062 according to the space between the strip support plate 0613 of the cone-shaped fixed tire frame 061 and the bottom cross beam 4. Use the pad 062 to fill the space between the strip support plate 0613 and the bottom cross beam 4. Connect the strip support plate 0613 and the bottom cross beam 4 with a bolt and nut structure to complete the support and fixation of the entire nozzle fixing device 6 to the engine nozzle.

[0063] Step 5) The middle cross beam 3 is connected and fixed to the base bracket 1 to securely fix the engine and complete the engine assembly.

[0064] Step 6) After assembly is completed, it is directly loaded onto a truck for transportation without using a special transport box.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A liquid rocket engine assembly and transportation device, comprising a base frame, the base frame comprising a pair of vertically spaced, opposed "Π"-shaped frames, the top horizontal beams of the pair of "Π"-shaped frames connected at both ends by a pair of horizontally spaced, opposed upper beams, the vertical vertical beams on either side of the pair of "Π"-shaped frames connected at their middle portions by a pair of intermediate beams, the lower ends of the vertical vertical beams on either side connected by a pair of horizontally disposed, open beams, the ends of each vertical vertical beam extending beyond the connecting ends of the open beams, the pair of open beams being provided with a pair of spaced, opposed bottom beams, each bottom beam being provided with a nozzle fixing device; The nozzle fixing device includes a cone fixing tire frame that is sleeved on the lower end of the engine nozzle. The cone fixing tire frame is arranged on the bottom cross beam, and the cone fixing tire frame includes a cone fixing tire and a strip support plate. The strip support plate is arranged at the bottom of the cone fixing tire. The cone fixing tire is a truncated cone structure made of aviation sponge, and the interior of the truncated cone is a cavity.

2. The assembly and transportation device for a liquid rocket engine according to claim 1, characterized in that: A pad is provided at the lower end of the cone-fixed tire frame, and the pad is located between the cone-fixed tire frame and the bottom crossbeam. Pads of different thicknesses are used to adjust the height of the cone-fixed tire frame to support the engine nozzle.

3. The assembly and transportation device for a liquid rocket engine according to claim 1 or 2, characterized in that: The lower ends of the vertical beams of the "Π"-shaped frame are connected to the support bottom beams on both sides. The support bottom beam is spaced from the bottom of the vertical beams of the "Π"-shaped frame. The nozzle fixing device can also be arranged on the support bottom beam.

4. The assembly and transportation device for a liquid rocket engine according to claim 3, characterized in that: The upper crossbeam is vertically intersected and connected with the horizontal crossbeam of the "Π"-shaped frame, the middle crossbeam is vertically intersected and connected with the vertical vertical beam of the "Π"-shaped frame, the opening crossbeam is vertically intersected and connected with the vertical vertical beam of the "Π"-shaped frame; the bottom crossbeam is vertically intersected with the opening crossbeam.

5. The assembly and transportation device for a liquid rocket engine according to claim 4, characterized in that: The connecting ends of the vertical beams and horizontal beams of the "Π"-shaped frame, the connecting ends of the open beams and the vertical beams of the "Π"-shaped frame, and the connecting ends of the vertical beams of the "Π"-shaped frame and the bottom beams of the bracket are all provided with fixing ribs.

6. A method for assembling a liquid rocket engine using the apparatus according to any one of the preceding claims, comprising the following steps: Step 1); a pair of base brackets are connected to a pair of upper cross beams to form an engine assembly bracket. First, the engine frame is installed on the upper cross beams, and then other engine components are installed in sequence; Step 2); move the engine thrust chamber and the turbo pump with a horizontal cart from the opening at the lower end of the base bracket to the bottom of the engine frame for installation, and complete the assembly and inspection of the engine components; Step 3); Install the opening beam to the bottom opening of the base bracket, and then connect the bottom beam to the base bracket and the opening beam; Step 4); Install the nozzle fixture on the bottom beam, and the upper end support sleeve of the nozzle fixture is arranged in the engine nozzle; Step 5); Connect and fix the middle crossbeam to the base bracket to complete the engine fixed assembly.

7. The method for assembling a liquid rocket engine according to claim 6, characterized in that: The step 4) further includes: when fixing the nozzle fixing device, first placing the nozzle fixing device on the ground below the engine nozzle, so that the strip support plate of the nozzle fixing device is parallel to the bottom crossbeam when placing it, and then rotating the nozzle fixing device 90°, lifting it and placing it on the bottom crossbeam, and fixing the strip support plate to the bottom crossbeam.

8. The method for assembling a liquid rocket engine according to claim 7, characterized in that: In the step 4), pads of different thicknesses are provided at the lower end of the strip-shaped support plate to adjust the nozzle fixing device to fit tightly with the engine nozzle.

9. A method for transporting a liquid rocket engine using the device according to any one of claims 1 to 5, comprising the following steps: Step 1); engine fixed assembly; comprising the engine assembly method according to any one of claims 6-8; Step 2): The engine is loaded onto a truck for transportation.

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