Separation limiting structure suitable for rocket sled test with supporting lug structural member

Abstract

According to the separation limiting structure for the rocket sled test with the supporting lug structural part, the structure is designed to be of a movable supporting lug type, the supporting lug of a tested object is pressed on a lower connecting plate of a sled vehicle, and front-back limiting and fixing of the tested object can be rapidly achieved. According to the design of the structure, the mode of an upper half ring and a lower half ring of a conventional connector is changed, the upper half ring is replaced by the movable supporting lug, the design and machining period of a clamping ring and a backing ring is greatly shortened, the movable supporting lug structure has the front-back limiting effect on a product and has the advantages of being small in mass, easy to machine and separate and the like, and the reliability and safety of elastic sledge separation are improved. When the test piece is provided with the support lug or the support lug is additionally arranged in the later period, the design period increased due to the complex shape of the test piece is greatly shortened, and the possibility of realizing the rocket test by the test piece with the complex shape is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of military product shooting range test, and mainly relates to a separation and limiting structure for a rocket sled test. Background Art

[0002] The rocket sled is a large-scale dynamic ground test system that uses a rocket engine as power and runs along a slide rail. The rocket sled test can provide an operating environment under hypersonic flight, and has the advantages of full size and easy observation. It has become an equally important test method as flight tests and wind tunnel tests. The rocket sled test is widely used in the ablation and protection of aerodynamic thermal materials, missile fuze performance research, radar performance under strong aerodynamic heating, aircraft escape, scramjet engine ignition, rain erosion test, missile terminal target accuracy research, anti-missile system destructiveness, etc.

[0003] The interface between the rocket sled test piece and the sled vehicle is usually designed in the form of a clamp ring, and the test piece is fixed to the rocket sled vehicle through 2-3 sets of upper and lower clamp rings. For test pieces with complex shapes, it is also necessary to design transition structures such as gaskets to limit the front and rear positions of the test piece, and fix the test piece with explosive bolts.

[0004] Usually, the design cycle of the retaining ring is long and the processing is difficult; the test piece with complex appearance will make it impossible to limit and fix it on the rocket sled, and it cannot be effectively separated during separation, resulting in experimental failure; the shape and size of the retaining ring with complex appearance often need to be determined according to the interface form and appearance size of the test piece, which makes the retaining ring difficult to process and has a long processing cycle, and the requirements for materials are relatively stringent; at the same time, the design process of the retaining ring also needs to consider the verification of the heading limit and connection reliability of the test piece, which greatly increases the design cycle; in summary, the retaining ring design cycle of the existing technology is long and the processing is difficult, which increases the cost of the rocket sled test and delays the progress of the identification test of national defense weapons and equipment. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, shorten the design cycle of the retaining ring, reduce the difficulty of retaining ring processing, and reduce the risk of the test piece's support ear not falling off during separation, the present invention provides a separation limiting structure suitable for a rocket sled test of a structural part with a support ear.

[0006] A separation and limiting structure suitable for a rocket sled test of a structure with a self-supporting ear, comprising a lower connecting plate 2, a limiting block 3, a movable supporting ear 4 and an explosive bolt 6; the movable supporting ear 4 is a cuboid; the lower connecting plate 2 is a rectangular plate; a groove is arranged on the bottom surface of the movable supporting ear 4; the lower connecting plate 2 is embedded in the groove, so that a gap is reserved between the lower connecting plate 2 and the bottom surface of the groove; the reserved gap is used to install the supporting ear of the test object; the supporting ear of the test object is a rectangular thin plate; the supporting ear of the test object passes through one end of the reserved gap and is connected to the limiting block at the other end of the reserved gap The block 3 is limited and fixed; the limit block 3 is arranged on the top surface of the lower connecting plate 2; the first screw hole is arranged at the bottom of the groove; the ear through hole is arranged on the test ear; the second screw hole is arranged on the lower connecting plate 2; the first screw hole and the second screw hole are through holes; after the lower connecting plate 2, the movable ear 4 and the test ear are installed, the first screw hole, the second screw hole and the ear through hole are coaxial; the top surface of the movable ear 4 is arranged with an explosive bolt 6; the explosive bolt 6 passes through the first screw hole, the second screw hole and the ear through hole, and is fixedly connected using the screw sleeve of the explosive bolt 6.

[0007] Furthermore, the sum of the height of the limiting block 3 and the height of the lower connecting plate 2 is greater than the height of the cross section of the groove.

[0008] Furthermore, a separation and limiting structure suitable for testing a rocket sled with a self-contained support ear structure includes a pulling device 5; the pulling device 5 includes a mounting seat, a first support rod, a second support rod, a third support rod and a fourth support rod; the mounting seat is a rectangular plate; one end of the first support rod, the second support rod, the third support rod and the fourth support rod are respectively fixedly connected to the mounting seat; the other ends of the first support rod, the second support rod, the third support rod and the fourth support rod are fixedly connected to the top surface of the movable support ear 4; the mounting seat, the first support rod, the second support rod, the third support rod, the fourth support rod and the top surface of the movable support ear 4 form a frame structure; a limiting hole is set in the center of the mounting seat; one end of the explosive bolt 6 is limit-connected to the limiting hole; the other end of the explosive bolt 6 passes through the first screw hole, the support ear through hole and the second screw hole in sequence, and is fixedly connected to the screw sleeve of the explosive bolt 6.

[0009] Furthermore, the cross section of the groove is an isosceles trapezoid.

[0010] Furthermore, the included angle between the waist of the groove cross section and the height of the groove cross section is α.

[0011] Furthermore, the two side surfaces of the lower connecting plate 2 contacting the movable support ear 4 are respectively provided with a first inclined surface and a second inclined surface; the angles between the first inclined surface, the second inclined surface and the height of the lower connecting plate 2 are all α; the two side surfaces of the test piece support ear contacting the movable support ear 4 are respectively coplanar with the first inclined surface and the second inclined surface on the same side.

[0012] Furthermore, the limit block 3 is a cuboid; a third inclined plane is provided on the surface of the limit block 3 in contact with the lug of the test object; and an angle between the third inclined plane and the height of the limit block 3 is α.

[0013] Furthermore, the calculation steps of α are:

[0014] When the explosive bolt does not press the movable lug and the lug of the test object tightly together, the resultant force pressing on the lug of the test object is the weight of the movable lug. The resultant force pressing on the lug of the test object is decomposed into two forces, one of which is a component force perpendicular to the inclined plane, and the other is a component force parallel to the inclined plane. The friction force on the contact surface between the lug of the test object and the movable lug is:

[0015] m×g×cosα×μ;

[0016] Where m is the mass of the movable lug, μ is the friction coefficient between the lug of the test object and the movable lug, and μ is determined according to the materials of the lug of the test object and the movable lug;

[0017] According to the formula:

[0018] m×g×cosα×μ=m×g×sinsα,

[0019] We obtain μ=tanα; μ is a known quantity, and the value of α can be solved from it.

[0020] Furthermore, when the materials of the test lug and the movable lug are both steel, the friction coefficient is 0.15 and the value of α is 9.

[0021] The beneficial effects of the present invention are:

[0022] 1. The movable support ear separation and limiting structure of the present invention can quickly limit the front and rear positions of the test piece by cooperating with the 9° groove of the movable support ear and the 9° boss of the lower connecting plate.

[0023] 2. The movable support ear separation and limiting structure of the present invention can realize the rapid separation of the product and the rocket sled by installing a pulling device on the movable support ear.

[0024] 3. The use of the movable support ear separation limit structure of the present invention can shorten the design cycle of the conventional rocket sled clamp. The use of the movable support ear can reduce the mass of the rocket sled clamp, thereby improving the safety of separation between the sled body and the test piece.

[0025] 4. By using the movable lug separation and limiting structure of the present invention and processing multiple groups of lug structures on a test piece with a complex shape, rocket sled testing of the test piece with a complex shape can be realized, thereby increasing the possibility of rocket sled testing of weapons and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is the general assembly drawing of the movable lug separation and limiting structure;

[0027] Figure 2 is the general assembly drawing of the movable support lug, the test object support lug, the limit block and the lower connecting plate, wherein (a) is the front view, (b) is the side view, (c) is the top view, and (d) is the stereogram;

[0028] Figure 3 is the general assembly drawing of the lower connecting plate, the limit block and the test piece's support ear, where (a) is a side view, (b) is a front view, (c) is a top view, and (d) is a stereogram;

[0029] Figure 4 This is the assembly drawing of the movable support ear and the pulling device

[0030] Figure 5 This is a partial exploded view of the movable lug separation limit structure

[0031] Figure 6 is a diagram of a movable support ear structure, wherein (a) is a top view, (b) is a cross-sectional view, (c) is a front view, and (d) is a stereogram;

[0032] Figure 7 1 is a structural diagram of the lower connecting plate, (a) is a top view, (b) is a side view, (c) is a front view, and (d) is a stereogram;

[0033] Figure 8 1 is a structural diagram of a limit block, (a) is a front view, (b) is a side view, and (c) is a stereogram;

[0034] Fig. 9 is the structure diagram of the test lug, (a) is the top view, (b) is the front view, (c) is the cross-sectional view, and (d) is the stereogram;

[0035] Fig.10 It is a structural diagram of the pulling device, wherein (a) is a top view and (b) is a side view

[0036] Fig.11 1 is a structural diagram of an explosive bolt sleeve and a lower connecting plate, wherein (a) is a front view, (b) is a side view, (c) is a bottom view, and (d) is a stereogram;

[0037] Fig.12 The tail adapter cabin and lug of the test piece

[0038] In the figure, 1-explosive bolt sleeve; 2-lower connecting plate; 3-limiting block; 4-movable support ear; 5-pulling device; 6-explosive bolt; 7-test product support ear; 8-clamp support plate; 9-lower clamp; 10-test product; 11-test product support ear; 12-first inclined plane; 13-second inclined plane; 14-third inclined plane, 15-thread sleeve of explosive bolt, 16-adapter cabin. DETAILED DESCRIPTION

[0039] The present invention provides a separation and limiting structure for rocket sled testing with a self-contained lug structure. The structure is designed as a movable lug type. The lug of the test object is pressed on the lower connecting plate of the sled, which can quickly achieve the front and rear limit and fixation of the test object. The design of this structure changes the form of the upper and lower semi-rings of the conventional interface. The upper semi-ring is replaced by a movable lug, which greatly reduces the design and processing cycle of the clamping ring and the gasket. The movable lug structure plays a front and rear limit role for the product and has the characteristics of small mass, easy processing and easy separation, which improves the reliability and safety of the rocket sled separation. When the test object itself has a lug or the lug is added later, the design cycle increased by the complex shape of the test object is greatly shortened, and the possibility of realizing rocket testing of the test object with a complex shape is improved. When the test system has multiple sets of new movable lug structures, the test cycle of weapons and equipment is reduced, and a faster rocket sled test product platform is provided for the research and development of new types of weapons and equipment.

[0040] The scheme adopted by the present invention is:

[0041] A separation and limiting structure suitable for a rocket sled test of a structural member with a support ear, comprising a lower connecting plate 2, a limiting block 3, a movable support ear 4, a pulling device 5 and an explosive bolt 6; the movable support ear 4 is a cuboid; the lower connecting plate 2 is a rectangular plate; a groove is arranged on the bottom surface of the movable support ear 4; the lower connecting plate 2 is embedded in the groove, so that a gap is reserved between the lower connecting plate 2 and the bottom surface of the groove; the reserved gap is used to install the test ear; the test ear is a rectangular thin plate; a support ear through hole is arranged on the test ear; the test ear passes through one end of the reserved gap and is fixed with the limiting block 3 at the other end of the reserved gap; the limiting block 3 is arranged on the top surface of the lower connecting plate 2; the sum of the height of the limiting block 3 and the height of the lower connecting plate 2 is greater than the height of the cross section of the groove; a first screw hole is arranged at the bottom of the groove; a second screw hole is arranged on the lower connecting plate 2; the first screw hole and the second screw hole are through holes; the After the lower connecting plate 2 is installed with the movable support ear 4, the first screw hole is coaxial with the second screw hole; a pulling device 5 is arranged on the top surface of the movable support ear 4; the pulling device 5 comprises a mounting seat, a first support rod, a second support rod, a third support rod and a fourth support rod; the mounting seat is a rectangular plate; one end of the first support rod, the second support rod, the third support rod and the fourth support rod are respectively fixedly connected to the mounting seat; the other ends of the first support rod, the second support rod, the third support rod and the fourth support rod are fixedly connected to the top surface of the movable support ear 4; the mounting seat, the first support rod, the second support rod, the third support rod, the fourth support rod and the top surface of the movable support ear 4 form a frame structure; a limiting hole is arranged in the center of the mounting seat; one end of the explosive bolt 6 is fixedly fixed to the limiting hole; the other end of the explosive bolt 6 passes through the first screw hole, the support ear through hole and the second screw hole in sequence, and is fixedly connected to the screw sleeve of the explosive bolt 6.

[0042] The cross section of the groove is an isosceles trapezoid.

[0043] The included angle between the waist of the groove cross section and the height of the groove cross section is α.

[0044] The two side surfaces of the lower connecting plate 2 contacting the movable support ear 4 are respectively provided with a first inclined surface and a second inclined surface; the angles between the first inclined surface, the second inclined surface and the height of the lower connecting plate 2 are all α; the two side surfaces of the test piece support ear contacting the movable support ear 4 are respectively coplanar with the first inclined surface and the second inclined surface on the same side.

[0045] The limit block 3 is a cuboid; a third inclined plane is arranged on the surface of the limit block 3 in contact with the lug of the test object; and an angle between the third inclined plane and the height of the limit block 3 is α.

[0046] When the explosive bolt does not press the movable lug and the lug of the test object tightly together, the resultant force pressing on the lug of the test object is the weight of the movable lug. The resultant force pressing on the lug of the test object is decomposed into two forces, one of which is the component perpendicular to the inclined plane, and the other is the component parallel to the inclined plane. The friction force of the lug contact surface is m×g×cosα×μ, where m is the mass of the movable lug and μ is the friction coefficient between the lug of the test object and the movable lug; according to the formula:

[0047] m×g×cosα×μ=m×g×sinsα,

[0048] It can be obtained that μ = tanα, where μ is determined according to the materials of the test lug and the movable lug;

[0049] Therefore, α can be solved, which is the self-locking angle after the materials of the test lug and the movable lug are determined, that is, the test lug and the movable lug are in the critical state of the self-locking angle; at this time, the test lug can be fixed without falling off, and at the same time, when the explosive bolt is detonated, the risk of the test lug not falling off during separation is reduced. Therefore, according to the friction coefficient determined by the materials of the test lug and the movable lug, the value of α is determined according to the friction coefficient. At this time, α can not only increase the contact area between the test lug and the movable lug, and improve the structural reliability of the test lug and the movable lug when the pry body moves, but also reduce the risk of the test lug not falling off during separation when the explosive bolt is detonated.

[0050] When the materials of the test lug and the movable lug are both steel, the friction coefficient is 0.15 and the value of α is 9.

[0051] When in use, the lower connecting plate 2 is fixedly welded to the support plate of the rocket skid or the lower half ring of the rocket skid, and the test piece support ear and the movable support ear are fixed with explosive bolts to complete the assembly; the configuration of the rocket skid support plate is consistent with the configuration of the test piece; the function of the pulling device is to pull up the movable support ear with the explosive bolt detonation force after the explosive bolt is detonated, and the test piece is separated from the rocket sled at this time. Since the movable support ear itself is light in weight, the risk of the test piece and the rocket sled not being able to be separated normally due to insufficient pulling force is reduced, and the safety and reliability of the test are improved.

[0052] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0053] The movable ear separation and limiting structure of the present invention is as follows: Figure 1 As shown in the figure, the rear snap ring is located in the product skid. The traditional snap ring form is improved to adopt a pair of movable ears in the form of 9° grooves, such as Figure 6As shown, the product is fixed on the rocket sled. The lower clamp ring 9 is placed on the support plate 8 and welded to it, as shown in FIG. Figure 7 As shown, the lower connecting plate is placed on the lower supporting plate and welded to it. Fig. 9 As shown in the figure, both sides of the lower connecting plate and the test piece's support ears are machined with 9° bosses, such as Figure 2 As shown in the figure, the movable lugs press the lugs of the test object tightly against the lower connecting plate, and the 9° grooves and 9° bosses cooperate to prevent the test object from moving forward and backward. Figure 8 As shown, the limit block is welded to the lower connecting plate, and the contact surface gap between the test lug and the limit block is small enough to ensure that the left and right limit of the test lug is reliable. Figure 3 As shown. Fig.10 As shown, a pull-up device is installed on the movable support ear, and the pull-up device and the movable support ear are matched through threads, such as Figure 4 As shown, ensure that the movable lug and the product do not interfere with each other after the explosive bolt is detonated. The explosive bolt passes through the movable lug, the lug of the test product, the through hole of the lower connecting plate and is tightened with the explosive bolt sleeve, as shown in the figure. Figure 5 As shown, the lugs of the test object are fixed on the rocket sled. According to the different positions of the lugs of the weapons and equipment themselves, the position of the movable lug separation and limiting mechanism can be adjusted to meet the limitation and installation of the test object on the rocket sled.

[0054] The present invention is also realized in that: the movable support ear separation and limiting mechanism is mainly composed of an upper movable support ear, a lower connecting plate, a limiting block, a pulling device, an explosive bolt, and an explosive bolt sleeve. The upper movable support ear has a 9° groove on the inner side, and the lower connecting plate has a 9° boss on the outer side. The upper movable support ear presses the specimen support ear on the lower connecting plate, and the front and rear limiting of the specimen is achieved by the cooperation of the upper and lower 9° grooves and the 9° boss.

[0055] The present invention is also realized in that the movable support ear can directly fix the product on the rocket sled vehicle, thereby reducing the disadvantage of the rocket sled design that the product cannot be clamped with a conventional clamp ring due to its too complex appearance.

[0056] The present invention is also achieved in that: the movable lug is lighter, easier to process, simpler in structure, easier to install and easier to separate than conventional clamps. The movable lug is equipped with a pulling device, which makes it easier to pull up the lug to achieve quick separation during the separation process of the rocket sled and the test piece. The present invention is also achieved in that: the movable lug separation limit structure can be used in test pieces with more complex shapes. Processing the lug structure on the test piece greatly shortens the complex design cycle of the rocket sled, and has the characteristics of safety, reliability and strong feasibility.

[0057] The present invention is described in detail below with reference to the accompanying drawings.

[0058] Embodiment 1:

[0059] In the test of a certain type of weapon high Mach number rocket sled, the product sled is a monorail rocket sled, and the first and second sleds provide propulsion power for the product. The maximum operating speed is 500m / s, and the test piece is fixed on the rocket sled by a movable lug limit structure.

[0060] The main structure of the movable support ear separation limiter of the present invention is as follows Figure 1 shown.

[0061] The movable lug separation limiting structure is to design the upper half of the conventional clamp ring into a movable lug, the movable lug has a 9° groove, and the lower half of the ring connecting plate has 9° bosses on both sides. The test piece lug is fixed to the lower connection by the movable lug, and the movable lug at the top, the test piece lug in the middle area and the lower connecting plate at the bottom are pressed tightly by explosive bolts. At this time, the test piece realizes the front and rear limit of the product under the limiting action of the movable lug and the lug of the lower clamping ring connecting plate.

[0062] The ears of the test piece itself are usually designed as an integral part of the product, and materials with good rigidity are usually selected as the ears to increase the reliability of the rocket sled system and avoid breakage of the ears of the test piece due to insufficient strength during rocket testing.

[0063] A limit block is designed on the side of the test piece's lug. The limit block fits tightly against the side of the lug, so the roughness of the contact surface between the limit block and the test piece's lug is ensured during the processing, ensuring that the test piece is limited to the left and right during the operation of the rocket sled.

[0064] The movable lug is equipped with a pulling device, and the four screws in the pulling device are screwed and fixed to the movable lug. The function of the pulling device is to pull up the movable lug with the explosive force of the explosive bolt after the explosive bolt is detonated, and the test piece is separated from the rocket sled at this time. Since the movable lug itself is light in weight, the risk of the test piece and the rocket sled not being able to be separated normally due to insufficient pulling force is reduced, and the safety and reliability of the test are improved.

[0065] Embodiment 2:

[0066] The structural limitation and separation method are the same as in Example 1.

[0067] The acceptance test of a certain scientific research project was carried out. The characteristic of this test is that the test piece itself does not have a lug, but there is a threaded section at the tail of the test piece. A transfer cabin is installed at the tail of the test piece, and lugs are machined on both sides of the cabin. The limit of the lugs on both sides of the extended cabin still uses a movable lug separation limit mechanism, such as Fig.12 shown.

[0068] When the test piece does not have its own lugs, it can be equipped with movable lugs in the later design, increasing the possibility of completing rocket sled tests on new weapons and equipment.

Claims

1. A separation and limiting structure suitable for a rocket sled test with a self-supporting ear structure, comprising a test ear; the test ear is a rectangular thin plate; the test ear is provided with an ear through hole, characterized in that: The invention comprises a lower connecting plate (2), a limiting block (3), a movable support ear (4) and an explosive bolt (6); the movable support ear (4) is a rectangular parallelepiped; the lower connecting plate (2) is a rectangular plate; a groove is arranged on the bottom surface of the movable support ear (4); the lower connecting plate (2) is embedded in the groove, so that a gap is reserved between the lower connecting plate (2) and the bottom surface of the groove; the reserved gap is used to install the support ear of the test object; the support ear of the test object passes through one end of the reserved gap and is fixed to the limiting block (3) at the other end of the reserved gap; the limiting block The block (3) is arranged on the top surface of the lower connecting plate (2); the bottom of the groove is provided with a first screw hole; the lower connecting plate (2) is provided with a second screw hole; the first screw hole and the second screw hole are through holes; after the lower connecting plate (2), the movable support ear (4) and the test object support ear are installed, the first screw hole, the second screw hole and the support ear through hole are coaxial; the top surface of the movable support ear (4) is provided with an explosive bolt (6); the explosive bolt (6) passes through the first screw hole, the second screw hole and the support ear through hole, and is fixedly connected using a screw sleeve of the explosive bolt (6).

2. A separation and limiting structure suitable for rocket sled testing with self-supporting ear structure according to claim 1, characterized in that: A separation limiting structure suitable for testing a rocket sled with a self-contained support ear structure comprises a pulling device (5); the pulling device (5) comprises a mounting seat, a first support rod, a second support rod, a third support rod and a fourth support rod; the mounting seat is a rectangular plate; one end of the first support rod, the second support rod, the third support rod and the fourth support rod are respectively fixedly connected to the mounting seat; the other ends of the first support rod, the second support rod, the third support rod and the fourth support rod are fixedly connected to the top surface of a movable support ear (4); the mounting seat, the first support rod, the second support rod, the third support rod, the fourth support rod and the top surface of the movable support ear (4) form a frame structure; a limiting hole is arranged at the center of the mounting seat; one end of the explosive bolt (6) is limit-connected to the limiting hole; the other end of the explosive bolt (6) passes through the first screw hole, the support ear through hole and the second screw hole in sequence and is fixedly connected to the screw sleeve of the explosive bolt (6).

3. The separation and limiting structure suitable for rocket sled testing with self-supporting ear structure according to claim 1 is characterized in that: The sum of the height of the limiting block (3) and the height of the lower connecting plate (2) is greater than the height of the groove cross section.

4. The separation and limiting structure suitable for rocket sled testing with self-supporting ear structure according to claim 1 is characterized in that: The cross section of the groove is an isosceles trapezoid.

5. The separation and limiting structure suitable for rocket sled testing with self-supporting ear structure according to claim 4, characterized in that: The included angle between the waist of the groove cross section and the height of the groove cross section is α.

6. The separation and limiting structure suitable for rocket sled testing with self-supporting ear structure according to claim 5, characterized in that: The two side surfaces of the lower connecting plate (2) in contact with the movable support ear (4) are respectively provided with a first inclined surface and a second inclined surface; the included angles of the first inclined surface, the second inclined surface and the height of the lower connecting plate (2) are all α; and the two side surfaces of the test object support ear in contact with the movable support ear (4) are respectively coplanar with the first inclined surface and the second inclined surface on the same side.

7. The separation and limiting structure suitable for rocket sled testing with self-supporting ear structure according to claim 1 is characterized in that: The limit block (3) is a rectangular parallelepiped; a third inclined plane is arranged on the surface of the limit block (3) in contact with the support ear of the test object; and an included angle between the third inclined plane and the height of the limit block (3) is α.

8. The separation and limiting structure suitable for rocket sled testing with self-supporting ear structure according to claim 6 is characterized in that: The calculation steps of α are: When the explosive bolt does not press the movable lug and the lug of the test object tightly together, the resultant force pressing on the lug of the test object is the weight of the movable lug. The resultant force pressing on the lug of the test object is decomposed into two forces, one of which is a component force perpendicular to the inclined plane, and the other is a component force parallel to the inclined plane. The friction force on the contact surface between the lug of the test object and the movable lug is: m×g×cosα×μ; where m is the mass of the movable lug, μ is the friction coefficient between the lug of the test piece and the movable lug, and μ is determined according to the materials of the lug of the test piece and the movable lug; According to the formula: m×g×cosα×μ=m×g×sinsα, We obtain μ=tanα; μ is a known quantity, and the value of α can be solved from it.

9. A separation and limiting structure suitable for rocket sled testing with self-supporting ear structure according to claim 8, characterized in that: When the materials of the test lug and the movable lug are both steel, the friction coefficient is 0.15 and the value of α is 9.

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