Triple ring structure for fixing supersonic monorail rocket sled engine

Abstract

The invention provides a triple-link structure for fixing supersonic monorail rocket sled engines. The triple-link structure mainly solves the problem that a large swing angle occurs when multiple rocket engines are sled. The triple ring structure for fixing the supersonic monorail rocket sled engine comprises a clamping ring, a supporting plate and a bolt. Each clamping ring is of a two-semi-ring structure, the three clamping rings are arranged on the supporting plate in a triangular mode, one semi-ring of each clamping ring is fixed to the supporting plate, and the two semi-rings of each clamping ring are fixed through a bolt; according to the skid body, after the engines are installed through the three-connecting-ring structure, the mass centers of all the engines are relatively concentrated, the rotational inertia of the whole thrust skid is small, the skid body is easier to automatically correct after rolling in the running process, and the stability of the thrust skid in on-orbit running is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of range test and experiment, and mainly relates to a rocket sled engine fixing structure. Background Art

[0002] At present, the most mature method for conducting ground hypersonic dynamic tests of weapon systems in the world is the rocket sled test. Through multi-stage power system acceleration, the tested product is accelerated to more than 5Ma along the high-precision slide rail, and related functions and performance evaluations such as aerodynamic characteristics, thermal ablation, structural response, and collision damage are carried out. Rocket sled tests include three types: single track, double track, and narrow double track. The single track rocket sled is easier to achieve hypersonic speed due to its simple structure, good streamline, low aerodynamic resistance, and small system mass redundancy. The single track rocket sled structure currently used in the test takes into account many factors such as the convenience of sled processing, structural safety, and economy. It is welded by sliding shoes, plates, and ring structures. This structural form has a large safety margin and can meet the needs of single track tests below 5Ma. In order to meet the growing demand for ground high dynamic tests of hypersonic weapon systems in my country, it is required to use a single track rocket sled to achieve hypersonic speeds of 5Ma to 7Ma, and a thrust sled is required to provide greater thrust. The thrust sled of a monorail rocket sled is generally equipped with one rocket engine. For 5-6 Ma hypersonic rocket sled tests, the first-stage sled can carry at most two rocket engines. For rocket sled tests with speeds greater than 6 Ma, the existing first-stage thrust sled cannot provide sufficient thrust. In order to achieve higher speeds and provide greater thrust, the number of engines needs to be increased. Since the monorail rocket sled rolls around the track during on-orbit operation, a large swing angle may occur, causing the system to become unstable. If the rocket engine is fixed in a flat arrangement, the system's moment of inertia will be large. Once the sled rolls during operation, it is not easy to correct itself, resulting in a large swing angle causing the system to become unstable. Therefore, when the sled carries multiple rocket engines, in order to avoid the large swing angle phenomenon, it is necessary to reduce the system's moment of inertia so that the sled can more easily correct its attitude after rolling, ensuring stable operation on track. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art and avoid the problem of large swing angles when multiple rocket engines are carried on a skid, the present invention proposes a three-link structure for fixing supersonic monorail rocket skid engines.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A three-link structure for fixing a supersonic monorail rocket sled engine, comprising a retaining ring and a support plate; the retaining ring is a hollow cylinder; the retaining ring comprises three groups, namely a first retaining ring, a second retaining ring and a third retaining ring; the support plate is a rectangular thin plate; the sides where the two long sides of the support plate are located are respectively provided with a first semicircular groove and a second semicircular groove; the side where one short side of the support plate is located is provided with a third semicircular groove; the side where the other short side of the support plate is located is provided with a rectangular groove; the support plate comprises a first support plate and a second support plate; a first retaining ring is provided in the first semicircular groove of the first support plate and the first semicircular groove of the second support plate; a second retaining ring is provided in the second semicircular groove of the first support plate and the second semicircular groove of the second support plate; a third retaining ring is provided in the third semicircular groove of the first support plate and the third semicircular groove of the second support plate; the first retaining ring, the second retaining ring and the third retaining ring are fixedly connected to the first support plate and the second support plate respectively.

[0006] Furthermore, the clamping ring includes a first half ring, a second half ring and a bolt; the first half ring and the second half ring form a hollow cylinder; the sum of the central angle of the arc of the cross section of the first half ring and the central angle of the arc of the cross section of the second half ring is 360 degrees; the first half ring and the second half ring are respectively provided with radial flanges at both ends along the circumferential direction; a through hole is provided on the flange; the clamping ring includes three groups, namely a first clamping ring, a second clamping ring and a third clamping ring; the first half ring of the first clamping ring is provided in the first semicircular groove of the first support plate and the first semicircular groove of the second support plate; the first half ring of the second clamping ring is provided in the second semicircular groove of the first support plate and the second semicircular groove of the second support plate; the third semicircular groove of the first support plate and the second The first half ring of the third clamping ring is arranged in the third semicircular groove of the support plate; the first semicircular grooves of the first support plate and the second support plate are fixedly connected to the first half ring of the first clamping ring; the second semicircular grooves of the first support plate and the second support plate are fixedly connected to the first half ring of the second clamping ring; the third semicircular grooves of the first support plate and the second support plate are fixedly connected to the first half ring of the third clamping ring; the second half ring of the first clamping ring is arranged on the first half ring of the first clamping ring; the second half ring of the second clamping ring is arranged on the first half ring of the second clamping ring; the second half ring of the third clamping ring is arranged on the first half ring of the third clamping ring; the bolts pass through the through holes on the flanges of the first half ring and the second half ring to fix the first half ring and the second half ring of the first clamping ring, the second clamping ring and the third clamping ring respectively.

[0007] Furthermore, a stop ring is respectively arranged inside the first retaining ring, the second retaining ring and the third retaining ring; the stop ring is a hollow cylinder; the radius of the outer circle of the stop ring is the same as the radius of the inner circle of the retaining ring, and there is a clearance fit between the outer wall of the stop ring and the inner wall of the retaining ring; a boss is arranged on one end face of the stop ring; the boss is fixedly connected to the end face of the stop ring; the boss is arc-shaped; the radial thickness of the boss is greater than the difference between the radius of the outer ring of the retaining ring and the radius of the inner ring of the retaining ring.

[0008] Furthermore, after the first snap ring, the second snap ring, the third snap ring, the first support plate and the second support plate are fixed, the axis of the first snap ring, the axis of the second snap ring and the axis of the third snap ring are parallel to each other; the distance between the first support plate and the second support plate is smaller than the axial length of the snap ring; the end faces of the first snap ring, the second snap ring and the third snap ring close to the first support plate are in the same plane.

[0009] Furthermore, a plurality of connecting plates are arranged between the first supporting plate and the second supporting plate to increase the overall strength and rigidity of the structure, thereby making the structure more stable and reliable.

[0010] Furthermore, weight-reducing holes are provided on the first support plate and the second support plate.

[0011] Furthermore, a chamfer with a radius of α is set between the flange of the second half ring of the first retaining ring and the outer surface of the retaining ring; a chamfer with a radius of α is set between the flange of the second half ring of the second retaining ring and the outer surface of the retaining ring; a chamfer with a radius of β is set between the flange of the first half ring of the first retaining ring and the outer surface of the retaining ring; a chamfer with a radius of β is set between the flange of the first half ring of the second retaining ring and the outer surface of the retaining ring; a chamfer with a radius of α is set between the flange of the first half ring of the third retaining ring and the outer surface of the retaining ring; a chamfer with a radius of α is set between the flange of the second half ring of the third retaining ring and the outer surface of the retaining ring.

[0012] Furthermore, the material of the clamp ring is 30CrMnSiNi2A steel; the material of the support plate is BS700 steel plate.

[0013] Furthermore, the bolts are M24 high-strength bolts.

[0014] Furthermore, α is 40 mm; β is 5 mm.

[0015] The present invention adopts a three-link structure, and has the following beneficial effects:

[0016] 1. The advantages of the present invention also lie in that after the engines are installed on the skid body of the present invention, the three engines are arranged in a "pin" structure, the mass centers of the engines are relatively concentrated, and the rotational inertia of the entire thrust sled is small, so that the skid body is easier to self-correct after rolling during operation, thereby improving the stability of the thrust sled in orbit;

[0017] 2. The advantages of the present invention also lie in that the structure is light in weight, high in strength, strong in universality, and simple in structure. In a limited space, the arrangement of the clamping ring is compact and reasonable, so that after the engine is installed, the lateral space occupied is small, thereby ensuring the slenderness ratio of the entire thrust sled system;

[0018] 3. The advantage of the present invention is that it provides a device with a simple structure that can effectively ensure the stable and reliable fixing and limiting of the rocket sled engine under supersonic conditions;

[0019] 4. The present invention also has the advantage that the structure includes a connecting plate, which effectively improves the rigidity, strength and stability of the structure;

[0020] 5. The advantage of the present invention is that the retaining ring of the structure is designed with a boss structure, which effectively ensures the heading limit of the engine and prevents the engine from rushing forward.

[0021] 6. The present invention also has the advantage of opening a hole on the central axis of the support plate, which reduces the structural mass and improves the thrust-to-weight ratio of the thrust sled while ensuring the structural strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a three-link structure including a boss and a stop ring;

[0023] Figure 2 It is a schematic diagram of a three-link structure without bosses and stop rings;

[0024] Figure 3 It is a structural diagram of the first half ring of the clasp and the chamfer radius of 40 mm, where: (a) - with boss, (b) - without boss;

[0025] Figure 4 It is the structural diagram of the first half ring of the clasp and the chamfer radius of 5 mm, where: (a) - with boss, (b) - without boss;

[0026] Figure 5 1 is a structural diagram of the second half ring of the clasp of the present invention, wherein: (a) - contains a boss, (b) - does not contain a boss;

[0027] Figure 6 It is a structural diagram of the support plate of the present invention;

[0028] Figure 7 It is a structural diagram of the stop ring of the present invention;

[0029] Figure 8 It is a structural diagram of the support plate and the connecting plate of the present invention;

[0030] Fig. 9 It is a bolt structure diagram used in the present invention;

[0031] Fig.10It is a schematic diagram of the connection between the stop ring and the front end of the engine;

[0032] Fig.11 This is a schematic diagram of the connection between the stop ring and the upper half of the snap ring;

[0033] Fig.12 This is a schematic diagram of the connection between the stop ring and the lower half of the snap ring;

[0034] Fig.13 This is a schematic diagram of the use of a certain type of rocket sled test triple link;

[0035] In the figure: 1-the first half of the retaining ring including the boss, 2-the stop ring, 3-the second half of the retaining ring including the boss, 4-the support plate, 5-the bolt; 6-the first half of the retaining ring, 7-the second half of the retaining ring. DETAILED DESCRIPTION

[0036] The scheme adopted by the present invention is:

[0037] A three-ring structure for fixing a supersonic monorail rocket sled engine, comprising a retaining ring, a support plate and bolts; the retaining ring comprises a first half ring and a second half ring; the first half ring and the second half ring form a hollow cylinder; the first half ring and the second half ring are respectively provided with radial flanges at both ends along the circumferential direction; a through hole is provided on the flange; the retaining ring comprises three groups, namely a first retaining ring, a second retaining ring and a third retaining ring; the support plate is a rectangular thin plate; the sides where the two long sides of the support plate are located are respectively provided with a first semicircular groove and a second semicircular groove; the side where one short side of the support plate is located is provided with a third semicircular groove; the side where the other short side of the support plate is located is provided with a rectangular groove; the support plate comprises a first support plate and a second support plate; the first half ring of the first retaining ring is provided in the first semicircular groove of the first support plate and the second support plate; the first support plate and the third The first half ring of the second snap ring is arranged in the second semicircular groove of the second support plate; the first half ring of the third snap ring is arranged in the third semicircular groove of the first support plate and the second support plate; the first semicircular groove of the first support plate and the second support plate are fixedly connected to the first half ring of the first snap ring; the second semicircular groove of the first support plate and the second support plate are fixedly connected to the first half ring of the second snap ring; the third semicircular groove of the first support plate and the second support plate are fixedly connected to the first half ring of the third snap ring; the second half ring of the first snap ring is arranged on the first half ring of the first snap ring; the second half ring of the second snap ring is arranged on the first half ring of the second snap ring; the second half ring of the third snap ring is arranged on the first half ring of the third snap ring; the bolts pass through the through holes on the flanges of the first half ring and the second half ring to fix the first half ring and the second half ring of the first snap ring, the second snap ring and the third snap ring respectively.

[0038] A stop ring is provided inside the first, second and third retaining rings respectively; the stop ring is a hollow cylinder; the radius of the outer circle of the stop ring is the same as the radius of the inner circle of the retaining ring, and there is a clearance fit between the outer wall of the stop ring and the inner wall of the retaining ring; a boss is provided on one end face of the stop ring; the boss is fixedly connected to the end face of the stop ring; the boss is arc-shaped; the thickness of the boss in the radial direction is greater than the difference between the outer ring radius of the retaining ring and the inner ring radius of the retaining ring. A stop ring is provided inside the retaining ring of the first three-link structure on the thrust sled located in the heading direction of the sled body to limit the engine, and the three-link structures at other positions do not need to be provided with a stop ring.

[0039] After the first snap ring, the second snap ring, the third snap ring, the first support plate and the second support plate are fixed, the axis of the first snap ring, the axis of the second snap ring and the axis of the third snap ring are parallel to each other; the distance between the first support plate and the second support plate is smaller than the axial length of the snap ring; the end faces of the first snap ring, the second snap ring and the third snap ring close to the first support plate are in the same plane; the end faces of the first snap ring, the second snap ring and the third snap ring close to the second support plate are in the same plane, thereby making the structure more stable.

[0040] A plurality of connecting plates are arranged between the first supporting plate and the second supporting plate to increase the overall strength and rigidity of the structure, making the structure more stable and reliable.

[0041] The first support plate and the second support plate are provided with weight-reducing holes for reducing the weight of the structure.

[0042] A chamfer with a radius of α is set between the flange of the second half ring of the first clamping ring and the outer surface of the clamping ring; a chamfer with a radius of α is set between the flange of the second half ring of the second clamping ring and the outer surface of the clamping ring; a chamfer with a radius of β is set between the flange of the first half ring of the first clamping ring and the outer surface of the clamping ring; a chamfer with a radius of β is set between the flange of the first half ring of the second clamping ring and the outer surface of the clamping ring; a chamfer with a radius of α is set between the flange of the first half ring of the third clamping ring and the outer surface of the clamping ring; a chamfer with a radius of α is set between the flange of the second half ring of the third clamping ring and the outer surface of the clamping ring, so as to facilitate structural construction and installation.

[0043] The material of the clamping ring is 30CrMnSiNi2A steel.

[0044] The bolts are M24 high-strength bolts.

[0045] The material of the support plate is BS700 steel plate.

[0046] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0047] The present invention is a rocket sled engine fixing device, which is installed on the rocket sled body, and includes an engine snap ring, a support plate, a backstop ring, a connecting plate, and an M24 bolt; the M24 bolt contains a nut, a flat washer, and a spring washer. The snap rings are all two-half ring structures, which are installed above the support plate and on the left and right sides. The lower half of the snap ring is welded to the support plate, and a connecting plate is welded between the three lower half rings of the snap ring and the two support plates to increase the overall strength and rigidity of the structure and make the structure more stable and reliable. The backstop ring is installed between the upper half ring and the lower half ring of the snap ring, and the engine is fixed between the upper and lower half rings and the backstop ring by M24 bolts and nuts. The structure described in the present invention is repeatedly used on the same thrust sled, and generally 4 sets of three-link structures are installed on the thrust sled to fix the engine. Only the snap ring at the front end along the heading direction of the sled body is designed with a boss structure and a backstop ring is installed to limit the engine, and the other parts do not need bosses and backstop rings.

[0048] The present invention is realized in that: the material of the clamp ring is 30CrMnSiNi2A steel, the inner diameter of the clamp ring ranges from 298mm to 310mm, and the material thickness of the rest of the clamp ring is 9.5mm except for the clamp ring ears and chamfers, and the clamp ring width is 80mm; the chamfer radius between the upper half ring ears and the outer surface of the clamp ring of the left and right sides is 40mm, and the chamfer radius between the lower half ring ears and the outer surface of the clamp ring is 5mm; the chamfer radius between the upper half ring and the lower half ring ears and the outer surface of the clamp ring of the clamp ring at the upper part of the support plate is 40mm. Two M24 high-strength bolts are used to fix the engine on each single ring.

[0049] The present invention is also realized in that: a boss with a height of 8 mm and a width of 10 mm is provided at the front end of the clamping ring along the heading direction of the skid body, which can limit the stop ring and the engine to ensure that the engine will not fall off.

[0050] The present invention is also realized in that: the support plate is a 6mm thick BS700 steel plate, and a hole with a diameter of 70mm and a hole with a diameter of 50mm are opened on the central axis of the support plate, so as to reduce the weight of the entire structure and improve the thrust-to-weight ratio of the thrust sled where the fixing device is located.

[0051] The present invention is also realized in that the outer side of the support plate and the outer sides of the lower half rings of the three clamps are on the same plane, and the arc surface of the outer edge of the support plate is fully fitted with the outer surface of the lower half ring of the clamp, and they are connected together by welding.

[0052] The present invention is also achieved by welding a connecting plate between the three lower half rings of the clamping rings and the two supporting plates to improve the strength, rigidity and stability of the structure.

[0053] The implementation of the present invention also lies in: the material of the backstop ring is 20 steel, the width is 42mm, the inner side of the backstop ring is fully fitted with the engine, and the outer side is fully fitted with the inner side of the clamping ring, ensuring the connection safety between the engine and the clamping ring and ensuring that the engine will not fall off.

[0054] The hypersonic verification test of a certain project adopts a single-track 4-stage propulsion. The first-stage sled is a single-track thrust sled adopting the present invention, using three 300mm caliber engines as power. During the test, the three rocket engines on the first-stage sled are ignited. Under the thrust of the rocket engines, the rocket sled accelerates and slides along the slide rail. When it slides to a predetermined position, the dynamic power-on device cuts off the ground power grid, and the first-stage sled separates. At this time, the rocket sled system accelerates to 660m / s. After the first-stage sled separates, the rocket sled system continues to operate on track, eventually reaching a maximum speed of 7Ma, completing the relevant test verification.

[0055] Through the application of the present invention, it is ensured that the first-stage thrust sled provides sufficient thrust during the acceleration of the rocket sled, so that the rocket sled test can be carried out smoothly and reach the target speed, providing reliable technical support for the rocket sled test.

Claims

1. A three-link structure for fixing a supersonic monorail rocket sled engine, characterized in that: It includes a snap ring and a support plate; the snap ring is a hollow cylinder; the snap ring includes three groups, namely a first snap ring, a second snap ring and a third snap ring; the support plate is a rectangular thin plate; the sides where the two long sides of the support plate are located are respectively provided with a first semicircular groove and a second semicircular groove; the side where one short side of the support plate is located is provided with a third semicircular groove; the side where the other short side of the support plate is located is provided with a rectangular groove; the support plate includes a first support plate and a second support plate; the first snap ring is provided in the first semicircular groove of the first support plate and the first semicircular groove of the second support plate; the second snap ring is provided in the second semicircular groove of the first support plate and the second semicircular groove of the second support plate; the third snap ring is provided in the third semicircular groove of the first support plate and the third semicircular groove of the second support plate; the first snap ring, the second snap ring and the third snap ring are fixedly connected to the first support plate and the second support plate respectively.

2. The three-link structure for fixing a supersonic monorail rocket sled engine according to claim 1, characterized in that: The clamping ring comprises a first half ring, a second half ring and a bolt; the first half ring and the second half ring form a hollow cylinder; the sum of the central angle of the arc of the cross section of the first half ring and the central angle of the arc of the cross section of the second half ring is 360 degrees; the first half ring and the second half ring are respectively provided with radial flanges at both ends along the circumferential direction; a through hole is provided on the flange; the first half ring of the first clamping ring is provided in the first semicircular groove of the first support plate and the first semicircular groove of the second support plate; the first half ring of the second clamping ring is provided in the second semicircular groove of the first support plate and the second semicircular groove of the second support plate; the third semicircular groove of the first support plate and the third semicircular groove of the second support plate are provided The first half ring of the retaining ring; the first semicircular grooves of the first support plate and the second support plate are fixedly connected to the first half ring of the first retaining ring; the second semicircular grooves of the first support plate and the second support plate are fixedly connected to the first half ring of the second retaining ring; the third semicircular grooves of the first support plate and the second support plate are fixedly connected to the first half ring of the third retaining ring; the second half ring of the first retaining ring is arranged on the first half ring of the first retaining ring; the second half ring of the second retaining ring is arranged on the first half ring of the second retaining ring; the second half ring of the third retaining ring is arranged on the first half ring of the third retaining ring; the bolts pass through the through holes on the flanges of the first half ring and the second half ring to fix the first half ring and the second half ring of the first retaining ring, the second retaining ring and the third retaining ring respectively.

3. A three-link structure for fixing a supersonic monorail rocket sled engine according to claim 1 or claim 2, characterized in that: A stop ring is respectively arranged inside the first, second and third retaining rings; the stop ring is a hollow cylinder; the radius of the outer circle of the stop ring is the same as the radius of the inner circle of the retaining ring, and there is a clearance fit between the outer wall of the stop ring and the inner wall of the retaining ring; a boss is arranged on one end face of the stop ring; the boss is fixedly connected to the end face of the stop ring; the boss is arc-shaped; the thickness of the boss along the radial direction is greater than the difference between the radius of the outer ring of the retaining ring and the radius of the inner ring of the retaining ring.

4. The three-link structure for fixing a supersonic monorail rocket sled engine according to claim 1 or claim 2, characterized in that: After the first snap ring, the second snap ring, the third snap ring, the first support plate and the second support plate are fixed, the axis of the first snap ring, the axis of the second snap ring and the axis of the third snap ring are parallel to each other; the distance between the first support plate and the second support plate is smaller than the axial length of the snap ring; the end faces of the first snap ring, the second snap ring and the third snap ring close to the first support plate are in the same plane.

5. The three-link structure for fixing a supersonic monorail rocket sled engine according to claim 1 or claim 2, characterized in that: A plurality of connecting plates are arranged between the first supporting plate and the second supporting plate to increase the overall strength and rigidity of the structure, making the structure more stable and reliable.

6. The three-link structure for fixing a supersonic monorail rocket sled engine according to claim 1 or claim 2, characterized in that: The first support plate and the second support plate are provided with weight-reducing holes.

7. The three-link structure for fixing a supersonic monorail rocket sled engine according to claim 2, characterized in that: A chamfer with a radius of α is set between the flange of the second half ring of the first clasp and the outer surface of the clasp; a chamfer with a radius of α is set between the flange of the second half ring of the second clasp and the outer surface of the clasp; a chamfer with a radius of β is set between the flange of the first half ring of the first clasp and the outer surface of the clasp; a chamfer with a radius of β is set between the flange of the first half ring of the second clasp and the outer surface of the clasp; a chamfer with a radius of α is set between the flange of the first half ring of the third clasp and the outer surface of the clasp; a chamfer with a radius of α is set between the flange of the second half ring of the third clasp and the outer surface of the clasp.

8. The three-link structure for fixing a supersonic monorail rocket sled engine according to claim 1 or claim 2, characterized in that: The material of the clamping ring is 30CrMnSiNi2A steel.

9. The three-link structure for fixing a supersonic monorail rocket sled engine according to claim 1 or claim 2, characterized in that: The bolts are M24 high-strength bolts; the material of the support plate is BS700 steel plate.

10. The three-link structure for fixing a supersonic monorail rocket sled engine according to claim 7, characterized in that: α is 40mm; β is 5mm.

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