CN113465928B

CN113465928B - Adjustable fixing frame for mounting multi-model solid engine under multiple swinging angles

Info

Publication number: CN113465928B
Application number: CN202110813445.1A
Authority: CN
Inventors: 李军伟; 周心远; 顾兴鹏; 贺业; 覃生福; 王宁飞
Original assignee: Beijing Institute of Technology BIT
Current assignee: Beijing Institute of Technology BIT
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2022-05-27
Anticipated expiration: 2041-07-19
Also published as: CN113465928A

Abstract

The invention discloses an adjustable fixing frame for mounting multi-model solid engines under multiple swinging angles, and belongs to the field of solid rocket engine testing. The invention comprises a front side plate, a bottom plate, a left side plate, a right side plate, a front baffle, a rear baffle, a front support plate, a rear support plate and a long screw rod. The invention can realize the installation of various engines with different outer diameters and lengths, and can adapt to multiple swinging angles required by the engine ground test, on the basis, the solid engine ground test is carried out together by combining the rotary test table, the high overload environment of the solid rocket engine in the actual flight task is simulated by utilizing the centrifugal force generated when the rotary test table rotates, the axial movement of the engine caused by the overload centrifugal force can be avoided, and the potential safety hazard caused by the axial movement of the engine is further avoided. The invention has the advantages of simple structure, easy realization and wide adaptability.

Description

Adjustable fixing frame for mounting multi-model solid engine under multiple swinging angles

Technical Field

The invention relates to an adjustable fixing frame for mounting multi-model solid engines under multiple swinging angles, in particular to a fixing frame which is used for being matched with a rotary overload test bed to simulate an overload test environment, can adapt to various engine mounting angles and can mount various engines with different outer diameters and different lengths, and belongs to the field of solid rocket engine testing.

Background

The solid rocket engine is always in an overload state in an actual flight task, so that in many related tests of the solid rocket engine, the engine is always placed in an overload environment, and the condition close to the actual working condition can be really simulated in a ground test. The overload environment is usually provided by the high speed rotation of the overload test stand to generate centrifugal force, and it is a conventional test means to mount the engine on the mount and then mount the mount on the overload test stand. But the tooling of the engine on the overload test bed is a technical problem. Firstly, engines of different models have different shapes and sizes such as length, outer diameter and the like, and a plurality of different fixing frames are often required to be designed and processed to adapt to tools of different engines and overload test beds, so that the test cost and difficulty are increased, and the test process and the operation steps are more complicated; second, overload test stands tend to operate at extremely high speeds to provide high overload centrifugal forces, which place high strength, stiffness, and stability requirements on the mounts. Finally, in an actual flight mission, due to the change of a flight path, the burning speed direction of the propellant in the solid rocket engine usually has angle change with the overload force direction, and in order to research the influence of the angle on the combustion process of the engine, the installation angle of the engine is usually changed within a range in the ground test of the engine, which also puts requirements on a fixing device of the engine to be capable of adapting to multi-angle installation. In summary, the ground overload test of the solid rocket engine is usually subject to the three technical problems, so it is necessary to design an adjustable fixing frame which is used for the overload test bed, can be adapted to engines of various types (including different lengths and different outer diameters), is safe and reliable, and can adapt to multi-angle working conditions.

Disclosure of Invention

The invention aims to provide an adjustable fixing frame for mounting multi-type solid engines under multiple swinging angles, which can realize the mounting of various engines with different outer diameters and lengths and can adapt to the multiple swinging angles required by the engine ground test. The invention has the advantages of simple structure, easy realization and wide adaptability.

The purpose of the invention is realized by the following technical scheme.

The invention discloses an adjustable fixing frame for mounting multi-model solid engines under multiple swinging angles, which is connected with an overload test bed through a connecting rod, is combined with a rotary overload test bed to carry out a solid engine ground experiment together, and simulates a high overload environment of a solid rocket engine in an actual flight task by using a centrifugal force generated when the rotary overload test bed rotates. The shell of the solid engine is a cylinder, and the shell of the engine is a shaft section. The baffle of front and back symmetrical arrangement is processed flutedly, the wall of recess is used for forming shaft hole interference fit with the shaft part of engine, through shaft hole interference fit restriction engine is at radial degree of freedom, the recess terminal surface is used for preventing engine axial float, restricts engine axial and radial degree of freedom through the baffle of front and back symmetrical arrangement promptly, realizes the fixed of engine, and then adapts to the required many pendulum angles of putting of engine ground test. The baffle plate adaptive to the outer diameter of the engine is replaced according to the outer diameter of the engine so as to adapt to the installation of the engines with different outer diameters. The baffles which are symmetrically arranged in the front and the back are respectively fixed through the supporting plates which are symmetrically arranged in the front and the back, and the engines with different lengths are adapted by adjusting the relative positions of the supporting plates which are symmetrically arranged in the front and the back. The supporting plates which are symmetrically arranged in the front and the back are connected into a whole through the long screw rod, so that the structural strength of the adjustable fixing frame is enhanced.

The rotary overload test bed is used for mounting an engine fixing frame, and a high overload environment of the solid rocket engine in an actual flight task is simulated by using centrifugal force generated by high-speed rotation.

The solid engine has solid charge inside, and the burning direction is parallel to the engine axis direction, i.e. depending on the engine installation angle, while the overload direction is always horizontal, so that different overload-burning speed included angles can be obtained by changing the engine installation angle.

The invention discloses an adjustable fixing frame for mounting multi-model solid engines under multiple swinging angles. The front baffle and the rear baffle are the baffles which are symmetrically arranged front and back. The front supporting plate and the rear supporting plate are supporting plates which are symmetrically arranged front and back. The front baffle and the rear baffle which are symmetrically arranged at the front and the rear are respectively provided with a groove, the wall surface of each groove is used for forming shaft hole interference fit with the shaft section of the engine, the engine is limited in radial freedom degrees by the shaft hole interference fit, the end surface of each groove is used for preventing the engine from axially moving, the engine is limited in axial direction and radial freedom degrees by the front baffle and the rear baffle which are symmetrically arranged at the front and the rear, the engine is fixed, and therefore the multi-swing angle required by the ground test of the engine is adapted. The front baffle and the rear baffle which are adaptive to the outer diameter of the engine are replaced according to the outer diameter of the engine so as to adapt to the installation of the engines with different outer diameters. The preceding backup pad is used for fixed preceding baffle, and the back backup pad is used for fixed backplate. The relative position between the front supporting plate and the rear supporting plate can be adjusted to adapt to engines with different lengths. The front side plate, the bottom plate, the left side plate and the right side plate jointly form a basic framework of the adjustable fixing frame, and the front supporting plate and the rear supporting plate are fixedly arranged on the basic framework. The long screw rod is used for connecting the front supporting plate and the rear supporting plate into a whole, so that the structural strength of the adjustable fixing frame is enhanced.

Preferably, the adjustable fixing frame is arranged on the overload test bed through the mandrel, the fixing nut and the T-shaped connecting piece. The left side mandrel and the fixing nut are symmetrically arranged with the right side mandrel and the fixing nut. The left mandrel and the right mandrel penetrate through the mounting holes of the left side plate and the right side plate respectively and then penetrate through the through holes reserved in the overload test bed, the extending parts of the mandrels are processed with threads, and the fixing nuts are screwed up and are enabled to press the plane of the cantilever of the overload test bed. The connection between the mandrel part of the adjustable fixing frame and the overload test bed is realized.

Preferably, the T-shaped connecting piece is fixed on the front side plate of the adjustable fixing frame, and when the engine is horizontally placed, the T-shaped connecting piece is connected with the overload test bed through the horizontally placed connecting rod. If the installation angle of the engine needs to be changed, the mandrel is used as the circle center, the adjustable fixing frame rotates clockwise, meanwhile, the connecting rod with the corresponding length is replaced to connect the overload test bed with the T-shaped connecting piece of the adjustable fixing frame, and the installation angle required by the ground test of the engine can be adjusted.

The front, the back, the left and the right refer to the opposite directions.

The invention discloses a test method for installing adjustable fixing frames of multi-model solid engines under multiple swinging angles, which comprises the following steps: under the working condition of horizontal installation of the engine, the mandrel needs to be installed into the installation hole of the overload test bed through the hole in the fixing frame to keep the engine horizontal, then the fixing nut is screwed down, the T-shaped connecting piece is connected with the overload test bed through the corresponding connecting rod, and the assembly of the adjustable fixing frame on the overload test bed is completed. Then, when a solid engine is installed, a rear supporting plate needs to be installed firstly, appropriate installation holes are selected behind a left side plate and a right side plate according to the length of the currently installed engine, the rear supporting plate is fixed by bolts and stretches across between the left side plate and the right side plate, then a corresponding rear baffle is selected according to the outer diameter of the engine, the rear baffle is fixed on the rear supporting plate in a screw connection mode through the installation holes in the rear baffle, and then the engine is installed on the wall surface of a groove of the rear baffle in an interference fit mode so as to limit the radial freedom degree of the engine; the rear end face of the engine is closely attached to the end face of the groove in the rear baffle plate so as to limit the backward movement of the engine in the axial direction. And then a front support plate and a front baffle plate are symmetrically installed, and the front support plate is installed in a sliding groove in front of the left side plate and the right side plate. The end faces of the grooves of the front baffle and the rear baffle limit the axial movement of the engine together. And finally, connecting the front supporting plate and the rear supporting plate by using two long screw rods, so that the structural strength of the adjustable fixing frame is enhanced, and the installation of the engine is completed. If the engine with different types and different lengths and outer diameters needs to be replaced, after the previous engine is disassembled, the relative positions of the front supporting plate and the rear supporting plate only need to be moved back and forth, and then the corresponding front baffle and the corresponding rear baffle are replaced, so that the engine with the other size can be adapted. If engine ground tests are required to be carried out at different installation angles, the fixing frame is rotated clockwise by taking the mandrel as the circle center, and then the connecting rod with the corresponding length is used for connecting the T-shaped connecting piece of the adjustable fixing frame and the overload test bed, different overload-combustion included angles can be obtained, and the angle is usually changed between 0-90 degrees. The adjustable fixing frame passes through the baffle plates which are symmetrically arranged in the front and back, and the end faces and the wall surfaces of the grooves of the adjustable fixing frame can respectively limit the freedom degrees of the engine in the axial direction and the radial direction, so that the engine can be safely and reliably fixed within the range of the installation angle.

The baffles which are symmetrically arranged in front and back are namely a front baffle and a back baffle.

The supporting plates which are symmetrically arranged front and back are a front supporting plate and a back supporting plate.

Advantageous effects

1. The invention discloses an adjustable fixing frame for mounting multi-model solid engines under multiple swinging angles. Processing on the baffle of front and back symmetrical arrangement is fluted, the recess wall is used for forming shaft hole interference fit with the engine shaft section, through shaft hole interference fit restriction engine is at radial degree of freedom, the recess terminal surface is used for preventing the axial float of engine, restricts engine axial and radial degree of freedom jointly through the baffle of front and back symmetrical arrangement promptly, realizes that the engine is fixed with adjustable mount, avoids leading to the axial float of engine because overload centrifugal force, and then avoids the potential safety hazard that the axial float of engine brought, in addition, fixed mode be adapted to the required multiple angle of putting of engine ground test.

2. The invention discloses an adjustable fixing frame for mounting multi-model solid engines under multiple swinging angles, and a baffle plate adaptive to the outer diameter of an engine is replaced according to the outer diameter of the engine so as to adapt to the mounting of engines with different outer diameters. The baffles which are symmetrically arranged in the front and the back are respectively fixed on the supporting plates which are symmetrically arranged in the front and the back, and the engines with different lengths can be adapted by adjusting the relative positions between the supporting plates which are symmetrically arranged in the front and the back.

3. The adjustable fixing frame for mounting the multi-model solid engine under the multi-swinging angle, disclosed by the invention, can realize the beneficial effects 1 and 2, so that the mounting of the engines with different lengths and different outer diameters can be realized only by moving the front supporting plate and the rear supporting plate back and forth and replacing the front baffle and the rear baffle with different sizes, and the adjustable fixing frame has the advantages of simple structure, stable support, safety, reliability, easiness in realization, wide adaptability and the like.

4. The adjustable fixing frame for mounting the multi-model solid engine under the multi-swinging angle is characterized in that two long screws are arranged on the front and the back of the adjustable fixing frame, and the two long screws are symmetrically arranged on the front and the back of the adjustable fixing frame.

5. The invention discloses an adjustable fixing frame for mounting multi-type solid engines under multiple swinging angles, which is combined with a rotary overload test bed to carry out solid engine ground experiments, and can simulate a high overload environment of a solid rocket engine in an actual flight task by utilizing centrifugal force generated when the rotary overload test bed rotates at high speed.

6. The invention discloses an adjustable fixing frame for mounting multi-model solid engines under multiple swinging angles, which can realize multiple mounting angles required by an engine ground test if the mounting angle of a solid engine needs to be changed, the adjustable fixing frame is rotated clockwise by taking a mandrel as a circle center, and meanwhile, a connecting rod with a corresponding length is replaced to connect the adjustable fixing frame with an overload test bed, so that an overload-combustion included angle is adjustable within the range of 0-90 degrees.

Drawings

Fig. 1(a), fig. 1(b) and fig. 1(c) are respectively schematic installation diagrams of the adjustable fixing frame on the overload test bed at three installation and placement angles (0 °, 45 ° and 90 °). Fig. 2 is an assembly view of a certain type of engine on a fixing frame in the specific embodiment. Fig. 2 is a top view of fig. 1(a), which mainly reflects the specific assembly relationship of the engine on the adjustable fixing frame. Fig. 3 is an assembly view of another engine of a different size mounted on the mounting bracket, with respect to fig. 2, fig. 3 being adapted to fit engines of a different size by shifting the relative positions of the front and rear support plates and replacing the respective front and rear baffle plates.

The device comprises an overload test bed 1, a connecting rod 2, an adjustable fixing frame 3, a mandrel 4, a fixing nut 5, an overload test bed cantilever 6, a left side plate 7, a rear supporting plate 8, a compression screw 9, a rear baffle 10, a solid engine 11, a long screw 12, a right side plate 13, a T-shaped connecting piece 14, a front side plate 15, a bottom plate 16, a front baffle 17 and a front supporting plate 18.

Detailed Description

To better illustrate the objects and advantages of the present invention, the present invention is further described below with reference to the drawings and specific examples.

Example 1

As shown in fig. 1(a), fig. 1(b) and fig. 1(c), the present embodiment discloses an adjustable fixing frame for mounting a multi-model solid engine under multiple swing angles, and the schematic diagram of different mounting angles on an overload test bed comprises an overload test bed 1, a connecting rod 2, an adjustable fixing frame 3 and a mandrel 4.

The adjustable fixing frame 3 is connected with the overload test bed 1 through a connecting rod 2 and two mandrels 4. Fig. 1(a), 1(b) and 1(c) represent three different placing angles, i.e., the working conditions with the overload-combustion included angles of 0 °, 45 ° and 90 °, respectively. The placing angle of the fixing frame 3 can be adjusted by only rotating the mandrel 4 and replacing the connecting rods 2 with different lengths. The angle of putting generally changes in 0 ~ 90 within range, and the adjustable mount that is used for installing polytypic solid engine under the angle is put to many pendulum that this embodiment discloses can all fix the engine safely and reliably under the angle is put to the multiple.

As shown in fig. 2, the adjustable fixing frame for mounting a multi-model solid engine at multiple swing angles, referred to as adjustable fixing frame 3 for short, disclosed by the invention comprises a mandrel 4, a fixing nut 5, an overload test bed cantilever 6, a left side plate 7, a rear support plate 8, a compression screw 9, a rear baffle plate 10, a solid engine 11, a long screw 12, a right side plate 13, a T-shaped connecting piece 14, a front side plate 15, a bottom plate 16, a front baffle plate 17 and a front support plate 18.

The left side plate 7, the right side plate 13, the front side plate 15 and the bottom plate 16 jointly form a basic framework of the adjustable fixing frame 3, and all the plates are fixed in a bolt and welding mode. The left side plate 7 and the right side plate 13 are respectively arranged in grooves on the left side and the right side of the front side plate 15, and the grooves can play a role in positioning the engine 11 and are fixed at the positions by welding. In order to further enhance the strength of the whole structure, two sides of the bottom plate 16 are respectively connected with the left side plate 7 and the right side plate 13 through bolts and welded at the boundaries, thereby forming the basic skeleton of the adjustable fixing frame 3. The wall of recess is used for forming shaft hole interference fit with the shaft part of engine 11, through shaft hole interference fit restriction engine 11 is in radial each item degree of freedom, the terminal surface of recess is used for preventing engine 11's axial float, restricts engine axial and radial degree of freedom through preceding baffle 17, backplate 10 of front and back symmetrical arrangement promptly, realizes engine 11's fixed, and then adapts to the required many pendulum of engine ground test and puts the angle.

The T-shaped connecting piece 14, the connecting rod 2, the pair of mandrels 4 on the left side and the right side and the fixing nut 5 assemble the adjustable fixing frame 3 on an overload test bed. Wherein, the T-shaped connecting piece 14 is fixed on the front side plate 15 and is a part of the adjustable fixing frame 3. The T-shaped connecting piece 14 on the adjustable fixing frame 3 is connected with the overload test bed 1 through the connecting rod 2. The left side and the right side are respectively provided with a pair of mandrels 4 and fixing nuts 5 which are respectively and symmetrically arranged on a left side plate 7 and a right side plate 13. The left mandrel 4 and the right mandrel 4 penetrate through mounting holes of the left side plate 7 and the right side plate 13 respectively and then penetrate through holes reserved in the test bed cantilever 6 (the test bed cantilever 6 is a part of the overload test bed 1), threads are machined on the part, extending out finally, of the mandrels 4, and the fixing nuts 5 are screwed up and enable the fixing nuts 5 to press the plane of the test bed cantilever 6, so that the connection of the adjustable fixing frame 3 and the overload test bed 1 is achieved.

The solid engine 11 shown in fig. 2 has an outer diameter of 66mm and a length of 218mm and is mounted on the adjustable mount 3 by means of the front support plate 18, the rear support plate 8, the front baffle 17 and the rear baffle 10. The front support plate 18 and the rear support plate 8 are symmetrically arranged and completely consistent in appearance and size, and the front baffle plate 17 and the rear baffle plate 10 are the same in structure. The front baffle 17 and the rear baffle 10 which are symmetrically arranged at the front and the rear are respectively provided with a groove, the wall surface of each groove is used for forming shaft hole interference fit with the shaft section of the engine 11, the engine is limited in radial freedom degrees by the shaft hole interference fit, the end surface of each groove is used for preventing the engine 11 from axially moving, namely, the front baffle 17 and the rear baffle 10 which are symmetrically arranged at the front and the rear limit the axial direction and the radial freedom degrees of the engine, so that the engine 11 is fixed, and the structure is ensured to be fixed under three different installation angles shown in figure 1(a), figure 1(b) and figure 1(c), so that the engine 11 can be fixed in the radial direction and the axial direction, and the multiple swinging angles required by the engine ground test can be further adapted. The front baffle 17 and the rear baffle 10 which are adaptive to the outer diameter of the engine are replaced according to the different outer diameters of the engine so as to adapt to the installation of the engines with different outer diameters. When adapting to engines with different outer diameters, the required variation dimension of the front baffle 17 and the rear baffle 10 is mainly the inner diameter of the groove wall surface, and the inner diameter dimension needs to be in interference fit with the outer diameter of the engine 11, so the design should be carried out according to the outer diameter dimension of the engine 11. In addition, the front baffle 17 and the rear baffle 10 are provided with 4 through holes along the radial direction, and the through holes are arranged at intervals of 90 degrees and used for realizing positioning and installation on the front support plate 18 and the rear support plate 8. Through holes are formed in the middle of the front supporting plate 18 and the

rear supporting plate

8, 4 threaded holes are radially formed around the through holes, the threaded holes are arranged at intervals of 90 degrees and correspond to the through holes in the front baffle plate 17 and the rear baffle plate 10, and the front baffle plate and the rear baffle plate are fastened through compression screws 9. The front baffle 17 and the rear baffle 10 are stepped shaft-shaped in appearance, when the front baffle 17 and the rear baffle 10 are installed, the wall surfaces of the front baffle 17 and the rear baffle 10 are in clearance fit with the inner wall surfaces of the through holes in the front supporting plate 18 and the rear supporting plate 8 respectively, meanwhile, the end surfaces of the front baffle 17 and the rear baffle 10 are close to the front supporting plate 18 and the rear supporting plate 8, and finally, the front baffle 17 and the rear baffle 10 are fastened on the front supporting plate 18 and the rear supporting plate 8 respectively through screws. The front support plate 18 and the rear support plate 8 span between the left side plate 7 and the right side plate 13. A series of mounting holes are formed in the rear of the left side plate 7 and the right side plate 13, the number of the holes can be increased or reduced according to actual needs, a sliding groove is formed in the front of the left side plate 7 and the right side plate 13, the rear supporting plate 8 and the front supporting plate 18 are fixed through the holes and the grooves in a matched mode with bolts respectively, and specific selection is conducted according to the length of the current solid engine 11. If the engine 11 is long, a rear mounting hole is selected to mount the rear support plate 8; if the engine 11 is short, the forward mounting holes are selected for mounting the rear support plate 8, while the forward support plate 18 is slidably adjustable within the slot to accommodate solid engines 11 of different lengths. The front supporting plate 18 and the rear supporting plate 8 are common to various engines, no additional design is needed, and when engines of different sizes and models are installed, the installation of different engines can be realized only by replacing the corresponding front baffle 17 and the corresponding rear baffle 10 and adjusting the relative position between the front supporting plate 18 and the rear supporting plate 8. The left side plate 7, the right side plate 13, the front side plate 15 and the bottom plate 16 jointly form a basic framework of the adjustable fixing frame, the front supporting plate 18 and the rear supporting plate 8 together with the engine 11, the front baffle 17 and the rear baffle 10 are fixedly arranged on the basic framework, in order to enhance the strength of the whole structure, two through holes are respectively processed on the front supporting plate 18 and the rear supporting plate 8, and two long screw rods 12 are used for connecting the independent front supporting plate 18 and the independent rear supporting plate 8 into a whole, so that the strength of the whole structure of the adjustable fixing frame 3 is enhanced.

Fig. 3 shows a schematic view of the installation of another size type of solid engine on the adjustable mount 3, the engine having an outer diameter of 96mm and a length of 298 mm. The adjustable fixing frame for mounting the multi-model solid engine under the multi-swinging angle disclosed by the invention can be adapted to the solid engines with different outer diameters and lengths only by replacing the corresponding front baffle 17 and the corresponding rear baffle 10 and then adjusting the relative positions of the front supporting plate 18 and the rear supporting plate 8 back and forth when replacing the engine with another size model.

The front support plate 18 and the rear support plate 8 are identical in shape and size and are symmetrically arranged. The middle of the front baffle plate 17 and the rear baffle plate 10 are provided with through holes in a clearance fit mode. Meanwhile, threaded holes are radially formed around the through holes, and the front baffle plate 17 and the rear baffle plate 10 are fixed by the compression screws 9. The through holes are arranged at the left side and the right side of the front supporting plate 18 and the rear supporting plate 8 to place a pair of long screws 12, so that the front supporting plate 18 and the rear supporting plate 8 are connected to improve the overall structural strength of the adjustable fixing frame 3.

The front baffle 17 and the rear baffle 10 are identical in shape and size and are symmetrically arranged. The front baffle 17 and the rear baffle 10 are in a stepped shaft shape in appearance, the wall surfaces of the front baffle 17 and the rear baffle 10 are in clearance fit with the inner wall surfaces of the through holes of the front support plate 18 and the rear support plate 8 respectively, meanwhile, the end surfaces of the front baffle 17 and the rear baffle 10 are close to the front support plate 18 and the rear support plate 8, and through holes are arranged on the periphery along the radial direction to place compression screws 9 so as to be fastened with the front support plate 18 and the rear support plate 8 respectively. The front baffle 17 and the rear baffle 10 are provided with grooves for mounting and fixing the engine 11. The wall of recess is used for forming shaft hole interference fit with the shaft part of engine 11, through shaft hole interference fit restricts the engine at radial each item degree of freedom, the terminal surface of recess is used for preventing engine 11's axial float, restricts engine axial and radial degree of freedom through preceding baffle 17, backplate 10 of front and back symmetrical arrangement promptly, realizes engine 11's fixed, and then adapts to the required many pendulum of engine ground test and puts the angle.

The inner diameters of the grooves of the front baffle 17 and the rear baffle 10 should be designed according to the outer diameter of the engine 11. Engines 11 of different outer diameter sizes require front and

rear baffles

17, 10 of different groove inner diameter sizes.

The left side plate 7 and the right side plate 13 are symmetrically arranged. A series of mounting holes are arranged at the rear parts of the left side plate 7 and the right side plate 13, and a sliding groove is arranged at the front part. The front support plate 18 and the rear support plate 8 are respectively used for mounting the front support plate 18, the front support plate 18 can be slidably adjusted in the groove, and the relative position between the front support plate 18 and the rear support plate 8 can be adjusted to adapt to engines 11 with different lengths.

The working method of the adjustable fixing frame for mounting the multi-model solid engine under the multi-swinging angle disclosed by the embodiment comprises the following steps: under the horizontal working condition of the engine 11, the two mandrels 4 on the left side and the right side are respectively installed in the installation holes of the test bed cantilever 6 through the holes on the left side plate 7 and the right side plate 13, then the fixing nuts 5 are screwed, and then the T-shaped connecting piece 14 of the adjustable fixing frame 3 is connected with the overload test bed 1 by using the connecting rod 2 corresponding to the horizontal working condition, so that the assembly of the adjustable fixing frame 3 on the overload test bed 1 is completed. When the solid engine 11 is installed, the rear support plate 8 is first installed, an appropriate installation hole is selected behind the left and

right side plates

7 and 13 according to the length of the currently installed engine 11, and the rear support plate 8 is fixed by bolts so as to cross between the left and

right side plates

7 and 13. Then, selecting a corresponding front baffle 17 and a corresponding rear baffle 10 according to the outer diameter of the engine 11, fastening the rear baffle 10 on a rear supporting plate 8 through 4 mounting holes on the rear baffle 10 by using compression screws 9, and then mounting the engine 11 on the wall surface of a groove of the rear baffle 10 in an interference fit manner so as to limit the radial degree of freedom of the engine 11; the rear end face of the engine should closely abut the end face of the recess in the tailgate 10 to restrict the movement of the engine 11 in the axial direction to the rear. Then, a front support plate 18 and a front baffle 17 are symmetrically installed, and the front support plate 18 is installed in a slide groove in front of the left and

right side plates

7 and 13. The end faces of the grooves of the front baffle 17 and the rear baffle 10 jointly limit the play of the engine 11 in the axial direction. And finally, connecting the front support plate 18 and the rear support plate 8 by using two long screw rods 12, so that the structural strength of the adjustable fixing frame 3 is enhanced, and the installation of the engine 11 is completed. If the engine of another length and different types of the engine with the same outer diameter need to be replaced, after the previous engine is disassembled, the relative position between the front supporting plate 18 and the rear supporting plate 8 only needs to be adjusted by moving forwards and backwards, and then the corresponding front baffle 17 and the corresponding rear baffle 10 are replaced, so that the engine 11 of another size can be adapted. If engine ground tests are required to be carried out at different installation angles, the adjustable fixing frame 3 is rotated clockwise by taking the mandrel 4 as a circle center, and then the connecting rod 2 with corresponding length is used for connecting the T-shaped connecting piece 14 of the adjustable fixing frame 3 and the overload test bed 1, different overload-combustion included angles can be obtained, and the angle is usually changed between 0-90 degrees. The adjustable fixing frame 3 can respectively limit all degrees of freedom of the engine 11 in the axial direction and the radial direction through the groove end surface and the wall surface of the baffle plate which is symmetrically arranged in the front and back direction, so that the engine 11 can be safely and reliably fixed in the installation angle range.

The above description is further intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above description is only an illustrative embodiment of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A adjustable mount for installing polytypic solid engine under angle is put to many pendulum, its characterized in that: the connecting rod (2) is connected with the overload test bed (1), the rotary overload test bed (1) is combined to carry out solid engine ground experiment, and the centrifugal force generated when the rotary overload test bed (1) rotates is utilized to simulate the high overload environment of the solid rocket engine (11) in the actual flight task; the shell of the solid engine (11) is a cylinder, and the shell of the engine (11) is a shaft section; grooves are processed on the rear baffle (10) and the front baffle (17) which are symmetrically arranged in the front-back direction, the wall surfaces of the grooves are used for forming shaft hole interference fit with the shaft section of the engine (11), the radial freedom degree of the engine (11) is limited through the shaft hole interference fit, the end surfaces of the grooves are used for preventing the engine (11) from axially moving, namely the axial freedom degree and the radial freedom degree of the engine (11) are limited through the rear baffle (10) and the front baffle (17) which are symmetrically arranged in the front-back direction, the engine (11) is fixed, and therefore the multi-swinging angle required by the engine ground test is adapted; the baffle plates (10, 17) adapting to the outer diameter of the engine are replaced according to the outer diameter of the engine (11) so as to adapt to the installation of the engines (11) with different outer diameters; the rear baffle (10) and the front baffle (17) which are symmetrically arranged in the front and back are respectively fixed through a rear supporting plate (8) and a front supporting plate (18) which are symmetrically arranged in the front and back, and the engines (11) with different lengths are adapted by adjusting the relative positions of the supporting plates (8, 18) which are symmetrically arranged in the front and back; the supporting plates (8, 18) which are symmetrically arranged in front and back are connected into a whole through the long screw (12), so that the structural strength of the adjustable fixing frame (3) is enhanced.

2. The adjustable mount for mounting a multi-model solid engine at multiple tilt angles of claim 1, wherein: the rotary overload test bed (1) is used for mounting an adjustable fixing frame (3) and simulating a high overload environment of the solid rocket engine in an actual flight task by utilizing centrifugal force generated by high-speed rotation;

the solid engine (11) is internally provided with the solid charge, the combustion direction of the solid charge is parallel to the axial direction of the engine, namely, the combustion direction depends on the installation angle of the engine (11), and the overload direction is always horizontal, so that different overload-combustion speed included angles can be obtained by changing the installation angle of the engine (11).

3. An adjustable mount for mounting a multi-model solid engine at multiple tilt angles as defined in claim 1 or 2, wherein: the adjustable fixing frame (3) comprises a front side plate (15), a bottom plate (16), a left side plate (7), a right side plate (13), a front baffle plate (17), a rear baffle plate (10), a front supporting plate (18), a rear supporting plate (8), a compression screw (9) and a long screw (12); the front baffle (17) and the rear baffle (10) are baffles which are symmetrically arranged front and back; the front supporting plate (18) and the rear supporting plate (8) are supporting plates which are symmetrically arranged front and back; grooves are respectively machined in the front baffle (17) and the rear baffle (10) which are symmetrically arranged in the front and rear directions, the wall surfaces of the grooves are used for forming shaft hole interference fit with a shaft section of the engine (11), various degrees of freedom of the engine (11) in the radial direction are limited through the shaft hole interference fit, the end surfaces of the grooves are used for preventing the engine (11) from axially moving, namely the front baffle (17) and the rear baffle (10) which are symmetrically arranged in the front and rear directions are used for limiting the axial degree of freedom and the radial degree of freedom of the engine, the engine (11) is fixed, and therefore the multi-swinging angle required by the engine ground test is adapted; the front baffle (17) and the rear baffle (10) which adapt to the outer diameter of the engine are replaced according to the outer diameter of the engine so as to adapt to the installation of the engines with different outer diameters; the front supporting plate (18) is used for fixing the front baffle (17), and the rear supporting plate (8) is used for fixing the rear baffle (10); the relative position between the front supporting plate (18) and the rear supporting plate (8) can be adjusted to adapt to engines with different lengths; the front side plate (15), the bottom plate (16), the left side plate (7) and the right side plate (13) jointly form a basic framework of the adjustable fixing frame (3), and the front supporting plate (18) and the rear supporting plate (8) are fixedly arranged on the basic framework; the long screw rod (12) is used for connecting the front support plate (18) and the rear support plate (8) into a whole, so that the structural strength of the adjustable fixing frame (3) is enhanced.

4. The adjustable mount for mounting a multi-model solid engine at multiple tilt angles of claim 3, wherein: the adjustable fixing frame (3) is arranged on the overload test bed (1) through a mandrel (4), a fixing nut (5) and a T-shaped connecting piece (14); the left side mandrel (4) and the fixed nut (5) are symmetrically arranged with the right side mandrel (4) and the fixed nut (5); the method comprises the following steps that firstly, a left mandrel (4) and a right mandrel (4) respectively penetrate through mounting holes of a left side plate (7) and a right side plate (13) and then penetrate through a through hole reserved in an overload test bed (1), threads are machined on the part extending out of the mandrels (4), and a fixing nut (5) is screwed at the threads and presses the fixing nut (5) against the plane of an overload test bed cantilever (6); the connection between the mandrel (4) of the adjustable fixing frame (3) and the overload test bed (1) is realized.

5. The adjustable mount for mounting multiple models of solid state engines at multiple tilt angles of claim 3, wherein: the T-shaped connecting piece (14) is fixed on a front side plate (15) of the adjustable fixing frame (3), and when the engine (11) is horizontally placed, the T-shaped connecting piece (14) is connected with the overload test bed (1) through a connecting rod (2) which is horizontally placed; if the installation angle of the engine (11) needs to be changed, the mandrel (4) is used as the circle center, the adjustable fixing frame (3) rotates clockwise, the connecting rod (2) with the corresponding length is replaced at the same time, the overload test stand (1) is connected with the T-shaped connecting piece (14) of the adjustable fixing frame (3), and the installation angle required by the ground test of the engine can be adjusted.

6. The adjustable mount for mounting multiple size solid state engines at multiple tilt angles of claim 4 or 5, wherein: the testing method comprises the steps that under the working condition that the engine (11) is horizontally installed, firstly, the mandrel (4) needs to be installed into an installation hole of the overload test bed (1) through a hole in the adjustable fixing frame (3), the engine (11) is kept horizontal, then the fixing nut (5) is screwed, the T-shaped connecting piece (14) is connected with the overload test bed (1) through the corresponding connecting rod (2), and the assembly of the adjustable fixing frame (3) on the overload test bed (1) is completed; then, when the solid engine (11) is installed, the rear supporting plate (8) needs to be installed firstly, proper installation holes are selected behind the left side plate (7) and the right side plate (13) according to the length of the currently installed engine (11), the rear supporting plate (8) is fixed by bolts and stretches across between the left side plate (7) and the right side plate (13), then a corresponding rear baffle (10) is selected according to the outer diameter of the engine (11), the rear baffle (10) is fixed on the rear supporting plate (8) by a compression screw (9) through the installation holes in the rear baffle (10), and then the engine (11) is installed on the wall surface of the groove of the rear baffle (10) in an interference fit mode so as to limit the radial freedom degree of the engine (11); the rear end face of the engine (11) is tightly attached to the end face of the groove in the rear baffle plate (10) so as to limit the backward movement of the engine (11) in the axial direction; then a front support plate (18) and a front baffle plate (17) are symmetrically installed, and the front support plate (18) is installed in a sliding groove in front of the left side plate (7) and the right side plate (13); the end surfaces of the grooves of the front baffle (17) and the rear baffle (10) limit the axial movement of the engine (11) together; finally, two long screw rods (12) are used for connecting the front supporting plate (18) and the rear supporting plate (8), the structural strength of the adjustable fixing frame (3) is enhanced, and the engine (11) is mounted; if engines of different types with different lengths and outer diameters need to be replaced, after the previous engine (11) is disassembled, the relative positions of the front supporting plate (18) and the rear supporting plate (8) only need to be moved back and forth, and then the corresponding front baffle (17) and the corresponding rear baffle (10) are replaced, so that the engine (11) of the other size can be adapted; if engine ground tests are required to be carried out at different installation angles, the adjustable fixing frame (3) is rotated clockwise by taking the mandrel (4) as the center of a circle, and then the T-shaped connecting piece (14) of the adjustable fixing frame (3) and the overload test bed (1) are connected by using the connecting rod (2) with corresponding length, so that different overload-combustion included angles can be obtained, and the angle is usually changed between 0 and 90 degrees; the adjustable fixing frame (3) can respectively limit the freedom degrees of the engine (11) in the axial direction and the radial direction through the groove end surfaces and the wall surfaces of the baffle plates (10, 17) which are symmetrically arranged in the front and back direction, so that the engine (11) can be safely and reliably fixed in the installation angle range.