A liquid rocket engine pylon riveted jig structure
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING LANDSPACETECH CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-07-14
AI Technical Summary
During the riveting process of existing liquid rocket engine frames, it is difficult to guarantee the riveting accuracy, which affects the position of the engine thrust line and the attitude control adjustment capability. In addition, the existing skin stringer structure is not accurately positioned during the riveting process, making it difficult to meet the design requirements.
A riveting frame structure for a liquid rocket engine frame is adopted, including a base plate, a clamping device, a positioning shaft, a clamping plate, and a servo bracket positioner. It is used for positioning and assembling the large and small end frames of the frame and the servo bracket. The riveting is achieved through precise positioning and clamping, and it can adapt to engine frames with different tapers and heights.
It improves the positioning accuracy and efficiency of engine frame riveting, has strong adaptability, can meet the riveting requirements of engine frames with different tapers and heights, ensures that the form and position tolerances of the product after riveting meet the design requirements, and improves the engine installation accuracy.
Smart Images
Figure CN224487436U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of aerospace launch vehicle technology, and in particular to a riveted frame structure for a liquid rocket engine frame. Background Technology
[0002] The upper stage of a liquid rocket typically uses a single engine as the power source for the rocket body, with an engine mount connecting the engine to the rocket body. The mount for mounting the engine is generally a skin-string structure, mainly composed of a large end frame, a small end frame, stringers, and skin, all riveted together. The large end frame connects to the rear bottom of the propellant tank, while the small end frame connects to the engine.
[0003] The installation accuracy of the engine will affect the attitude control of the rocket body. Therefore, the riveting accuracy of the engine mount will directly affect the position of the engine thrust line and the attitude control adjustment capability. For the engine mount with a skin stringer structure, a jig is needed to fix and position each part during the riveting process to ensure the consistency of the actual product with the theoretical product in terms of size and contour. This ensures that the form and position tolerances of the riveted product meet the design specifications and that the engine mount and engine are installed after the engine is mounted on the rocket body, meeting the requirements for the misalignment and lateral movement of the engine thrust line relative to the rocket body axis.
[0004] Therefore, there is an urgent need to provide a frame structure for riveting liquid rocket engine frames. Utility Model Content
[0005] To solve the above-mentioned technical problems, this utility model proposes a frame structure for riveting liquid rocket engine frames. This frame structure can realize riveting in two states (horizontal riveting and vertical riveting) of the engine frame, and can adapt to engine frame riveting work with different tapers and different heights.
[0006] This utility model provides a riveting frame structure for a liquid rocket engine frame, used for positioning and assembling the large frame end, small frame end, frame stringers, skin, and servo bracket. It includes at least a base plate, a clamping device, a positioning shaft, a clamping plate, and a servo bracket positioner. The base plate is used for positioning and installing the large frame end; the clamping device is used to press and fix the positioned large frame end to the base plate; one end of the positioning shaft is fixed to the center of the base plate, and the other end is used for positioning and installing the small frame end; the clamping plate is used to press the small frame end to the positioning shaft; one end of the servo bracket positioner is fixed to the edge of the base plate, and the other end is used for positioning and installing the servo bracket.
[0007] In one embodiment, the frame structure of this embodiment further includes a support frame and a mounting base, and the base plate is vertically mounted to the support frame via the mounting base.
[0008] In one embodiment, the base plate is a circular plate with a first positioning hole at its edge for positioning the large end frame of the frame, and a second positioning hole at its center for fixing the positioning shaft.
[0009] In one embodiment, the axis of the first positioning hole is parallel to the axis of the second positioning hole.
[0010] In one embodiment, the base plate is provided with stringer position markings; the stringer position markings are used to locate the circumferential position of the frame stringers.
[0011] In one embodiment, the base plate is provided with quadrant lines; when installing the large end frame of the rack, the quadrant lines on the base plate are aligned with the quadrant lines on the large end frame of the rack to determine the circumferential position of the large end frame of the rack.
[0012] In one embodiment, the base plate is provided with skin edge engravings; the skin edge engravings are used to locate the circumferential position of the skin.
[0013] In one embodiment, the clamping plate is provided with quadrant lines. When installing the small end frame of the frame, the quadrant lines of the clamping plate are aligned with the quadrant lines of the small end frame of the frame to determine the circumferential position of the small end frame of the frame.
[0014] In one embodiment, at least four mounting seats are evenly distributed on the support frame, and the base plate is connected to each mounting seat by bolts and locating pins.
[0015] In one embodiment, the bottom of the support frame is provided with casters and a locking device; after the support frame is moved into place by the casters, it is locked and fixed by the locking device.
[0016] The frame structure for riveting liquid rocket engine frames provided by this utility model has at least one of the following beneficial effects:
[0017] I. The overall structure of the liquid rocket engine frame riveting frame of this utility model is simple, easy to assemble, low in cost, high in positioning accuracy, and reusable.
[0018] Second, the frame structure of this utility model has good adaptability and can realize horizontal and vertical riveting of the engine frame.
[0019] Third, the frame structure of this utility model has a wide range of applications and can adapt to the riveting work of engine frames with different tapers and heights.
[0020] Fourth, the frame structure of this utility model provides support and positioning for the riveting of the engine frame, thereby improving the riveting efficiency of the frame.
[0021] Upon reading the detailed embodiments and examining the accompanying drawings, those skilled in the art will recognize additional features and advantages. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a three-dimensional structural diagram of the frame mechanism according to an embodiment of the present utility model.
[0024] Figure 2 This is a three-dimensional structural diagram of the frame structure and engine frame after riveting according to an embodiment of the present invention.
[0025] Figure 3 This is a rear view of the riveting structure according to an embodiment of the present utility model.
[0026] Figure 4 This is a front view of the riveting structure according to an embodiment of the present utility model.
[0027] Figure 5 This is a main view of the frame structure and engine frame after riveting according to an embodiment of the present utility model.
[0028] Figure 6 This is a sectional view of the positioning of the small end frame of the frame according to an embodiment of this utility model.
[0029] Explanation of reference numerals in the attached figures:
[0030] 1. Base plate; 11. Circular part; 12. Extended part; 2. Clamping device; 3. Positioning shaft; 4. Clamping plate; 5. Servo bracket positioner; 6. Support frame; 61. Casters; 62. Locking device; 7. Mounting base; 91. Large end frame of the frame; 92. Small end frame of the frame; 93. Frame stringers. Detailed Implementation
[0031] The features and exemplary embodiments of various aspects of this utility model will be described in detail below. To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this utility model and to exemplarily illustrate the principles of this utility model, and are not configured to limit this utility model. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the dimensions of some structural components or regions in the drawings may be enlarged for other structural components or regions to aid in the understanding of the embodiments of this utility model.
[0032] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of this utility model. In the description of this utility model, it should be noted that, unless otherwise stated, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0033] Furthermore, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure or component that includes a list of elements includes not only those elements but also other structural elements that are not expressly listed or inherent to the structure or component. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes the element.
[0034] Spatial relation terms such as "below," "under," "under," "low," "above," "on," and "high" are used for descriptive convenience to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device, in addition to those different from those shown in the figure. Furthermore, phrases such as "one element on / below another element" can indicate that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first" and "second" are also used to describe individual elements, areas, parts, etc., and should not be considered limiting. Similar terms are used throughout the description to refer to similar elements.
[0035] For those skilled in the art, this invention can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples.
[0036] This invention provides a jig for riveting a skin-string engine frame. The main structure of the skin-string engine frame includes a large end frame, a small end frame, skin, frame stringers, and a servo bracket. The large end frame connects to the rear bottom of the storage tank, and the small end frame connects to the engine's normal-level seat. The servo bracket provides a mounting point for the servo actuator; one end of the servo actuator connects to the servo bracket, and the other end connects to the engine, used to control the engine's oscillation, thereby adjusting the rocket's flight attitude. The jig structure provided by this invention is used for positioning and riveting the engine frame and for positioning the servo bracket, ensuring that after riveting, the coaxiality of the large and small end frames, the parallelism of their mating surfaces, the quadrant line deviation, the installation accuracy of the servo bracket mounting points, and the height of the engine frame all meet design requirements.
[0037] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This utility model provides a riveting frame structure for a liquid rocket engine frame, used for positioning and assembling the large frame end, small frame end, frame stringers, skin, and servo bracket. The frame structure includes at least a base plate 1, a clamping device 2, a positioning shaft 3, a clamping plate 4, and a servo bracket positioner 5. The base plate 1 is circular, with the positioning shaft 3 mounted at its radial center and the large frame end 91 positioned along its radial edges. After the large frame end 91 is aligned with the base plate 1, the clamping device 2 clamps and secures it. One end of the positioning shaft 3 is fixed to the center of the base plate 1, and the other end is used for positioning the small frame end 92. After the small frame end 92 is fitted onto the positioning shaft 3, the clamping plate 4 clamps and secures it from the side of the small frame end 92 away from the positioning shaft 3. In this embodiment, the position and shape of the small end frame 92 relative to the large end frame 91 of the frame are precisely determined by the positioning axis 3. After positioning, the large end frame 91 and the small end frame 92 of the frame are formed by riveting them together one by one using multiple frame stringers 93. Figure 2 and Figure 5 This is a schematic diagram of the engine frame after riveting.
[0038] Additionally, a servo bracket positioner 5 is provided on the radial edge of the base plate 1. One end of the servo bracket positioner 5 is connected to the edge of the base plate 1 via a positioning pin and bolts, and the other end is used for positioning and mounting the servo bracket 94. In this embodiment, the servo bracket positioner 5 is used to determine the positional accuracy of the servo bracket 94's fulcrum relative to the small end frame 92 of the frame. The positional accuracy of the servo bracket's fulcrum is determined by fitting the mounting seat on the servo bracket 94 into the servo bracket positioner 5 and using a pin for positioning.
[0039] The frame structure of this utility model embodiment is used for riveting the engine frame and positioning the servo bracket. It can ensure that after riveting, the coaxiality of the large end frame and the small end frame of the engine frame, the parallelism of the mating surfaces of the large end frame and the small end frame of the frame, the quadrant line deviation of the large end frame and the small end frame of the frame, as well as the installation accuracy of the servo bracket support point and the height of the engine frame meet the design requirements.
[0040] The frame structure in this embodiment is commonly used for operation after the base plate is placed horizontally. To facilitate operators in selecting the riveting method according to actual conditions, such as adaptable switching between horizontal and vertical riveting, etc. Figure 2 and Figure 3 As shown, in this embodiment, the frame structure allows the base plate 1 to be detachably mounted on the support frame 6. The support frame 6 is welded from steel profiles, and a mounting base 7 is welded onto it. The base plate 1 is vertically mounted on the support frame 6 after being connected to the mounting base 7 by bolts and locating pins. The frame structure of this embodiment can adaptively adjust the support state according to assembly requirements. When riveting is required in the vertical direction of the engine frame, the base plate 1 can be removed from the support frame 6 and placed on a horizontal operating table, allowing the operator to perform riveting from the vertical direction of the engine frame.
[0041] Furthermore, in order to increase the installation reliability of the base plate 1, at least four mounting seats 7 can be evenly arranged on the support frame 6, and the base plate 1 is connected to each mounting seat 7 by bolts and positioning pins.
[0042] Furthermore, such as Figure 1 As shown, to facilitate the transfer and fixation of the frame structure (or support frame 6), casters 61 and locking devices 62 can be installed at the bottom of the support frame 6. After the support frame 6 is transferred into place by the casters 61, it is locked and fixed by the locking devices 62.
[0043] See also Figure 1 , Figure 4 and Figure 5 In one embodiment, the base plate 1 includes an annular portion 11 and a protruding portion 12 extending toward the center point of the annulus. The annular portion 11 of the base plate 1 is provided with a plurality of evenly distributed first positioning holes, skin edge markings, stringer position markings, quadrant line markings, and a clamping device. The protruding portion 12 of the base plate is provided with a second positioning hole for fixing the positioning shaft 3 at the center of the entire base plate 1, and the axis of the first positioning hole is parallel to the axis of the second positioning hole. In the frame structure of this embodiment, the circumferential position of the large end frame of the frame is determined by aligning the quadrant line markings with the quadrant line markings of the large end frame of the frame. At the same time, the radial position of the large end frame 91 of the frame is located by the first positioning holes and fixed by the positioning pins, and then clamped by the clamping device 2. The skin edge markings are used to locate the circumferential position of the engine frame skin, and the stringer position markings are used to locate the circumferential position of the engine frame stringers 93.
[0044] See Figure 6 In one embodiment, in order to facilitate the positioning of the clamping plate 4 with the positioning shaft 3 and the small end frame 92 of the frame, two positioning pin holes can be provided on the clamping plate 4. One positioning pin hole is used to position with the positioning shaft 3 and fix it with a pin, and the other positioning pin hole is used to position with the small end frame 92 and fix it with a pin.
[0045] To further refine the positioning of the clamping plate 4 and the small end frame 92, the clamping plate 4 in this embodiment is provided with quadrant lines and bolt holes. After the small end frame 92 is fitted onto the positioning shaft 3, the clamping plate 4 is installed. First, the quadrant lines of the clamping plate 4 are aligned with the lines of the small end frame 92, and then it is connected to the small end frame 92 with bolts, thereby clamping the small end frame 92 with the clamping plate 4.
[0046] The frame structure of this embodiment can adapt to changes in the cone angle of the engine frame. When the height of the engine frame changes, only the axial dimension of the small end frame positioning shaft needs to be adaptively modified to achieve precise positioning of the various components of the engine frame.
[0047] The above embodiments can be combined with each other and have corresponding technical effects.
[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A riveting frame structure for a liquid rocket engine frame, used for positioning and assembling the large frame end, small frame end, frame stringers, skin, and servo bracket, characterized in that, At least including: Base plate, for positioning and installation of the large end frame of the machine frame; A clamping device is used to press and fix the positioned frame large end frame to the base plate; The positioning shaft has one end fixed to the center of the base plate and the other end used for positioning and installation of the small end frame of the frame; A clamping plate is used to press the small end frame of the frame against the positioning shaft; The servo bracket positioner has one end fixed to the edge of the base plate and the other end used for positioning and installation of the servo bracket.
2. The frame structure according to claim 1, characterized in that, It also includes a support frame and a mounting base, with the base plate vertically mounted to the support frame via the mounting base.
3. The frame structure according to claim 1 or 2, characterized in that, The base plate is a circular plate with a first positioning hole at its edge for positioning the large end frame of the frame, and a second positioning hole at its center for fixing the positioning shaft.
4. The frame structure according to claim 3, characterized in that, The axis of the first positioning hole is parallel to the axis of the second positioning hole.
5. The frame structure according to claim 4, characterized in that, The base plate is provided with stringer position markings; the stringer position markings are used to locate the circumferential position of the frame stringers.
6. The frame structure according to claim 5, characterized in that, The base plate is provided with quadrant lines; when installing the large end frame of the frame, the quadrant lines on the base plate are aligned with the quadrant lines on the large end frame of the frame to determine the circumferential position of the large end frame of the frame.
7. The frame structure according to claim 6, characterized in that, The base plate is provided with skin edge engravings; the skin edge engravings are used to locate the circumferential position of the skin.
8. The frame structure according to claim 1, characterized in that, The clamping plate is provided with quadrant lines. When installing the small end frame of the machine frame, the quadrant lines of the clamping plate are aligned with the quadrant lines of the small end frame of the machine frame to determine the circumferential position of the small end frame of the machine frame.
9. The frame structure according to claim 2, characterized in that, At least four mounting seats are evenly distributed on the support frame, and the base plate is connected to each mounting seat by bolts and locating pins.
10. The frame structure according to claim 2, characterized in that, The bottom of the support frame is equipped with casters and a locking device; after the support frame is moved into place by the casters, it is locked and fixed by the locking device.