Tool for displacement acquisition during hydraulic test of solid rocket engine shell

Abstract

The invention provides a tool for displacement acquisition during hydraulic test of a solid rocket engine shell, which is characterized by comprising a fixed base (1), a sliding base (2), a limiting block (3), a displacement clamping device assembly (4) and a sliding rail (5), the fixed base (1) comprises a flat base and a bracket; the sliding base (2) is symmetrical to a bracket structure fixed on the base (1) and is positioned on the other side of the flat base; the limiting block (3) is positioned on the outer side of the sliding base (2); the displacement clamping device assembly (4) is located on the sliding rail (5) and comprises a sliding block (6), a supporting rod A (7), a supporting rod B (8), a displacement meter clamping device (9) and a displacement meter (10). The device can effectively solve the problems of shell rigid body displacement and displacement meter measuring point offset in the hydraulic test process of the solid rocket engine shell and a similar cylindrical pressure-bearing structural member, and can accurately detect the radial displacement change condition of the solid rocket engine shell in the bearing process.

Description

Technical Field

[0001] The invention relates to the field of solid rocket engines and pressure vessels, and in particular to a tool for collecting displacement during hydraulic testing of a solid rocket engine casing. Background Art

[0002] The displacement change of the solid rocket engine casing during operation reflects the consistency between the casing's technical status and design status, and has an important impact on the engine launch and the determination of the engine status. At present, the engine casing is mostly supported by simple sleepers during hydraulic testing. During the displacement acquisition process, the casing often undergoes rigid body displacement and displacement meter and measuring point offset due to the internal pressure load, resulting in inaccurate displacement test results.

[0003] The present invention proposes a tool for collecting displacement during hydraulic testing of a solid rocket engine casing, which comprehensively considers the clamping of casings with different projectile diameters, the clamping and positioning of the displacement test device, the geometric relationship during the casing displacement process, and the possible explosion factors during the casing hydraulic process. The designed structure can accurately and efficiently measure the radial displacement changes during the casing hydraulic process, and a set of tooling can be used to test casings with different projectile diameters. Summary of the invention

[0004] The technical problem solved by the present invention is: to provide a tool for collecting displacement during hydraulic testing of solid rocket engine casings, so as to solve the problems of inaccurate displacement collection of solid rocket engine casings and other cylindrical pressure vessels during hydraulic testing, the inability of hydraulic tooling to meet the testing of casings of various projectile diameters, and rigid body displacement caused by gravity after the displacement meter is clamped.

[0005] In order to solve the above problems, the present invention provides a tooling for displacement collection during hydraulic testing of a solid rocket engine casing, characterized in that it includes a fixed base 1, a sliding base 2, a limit block 3, a displacement clamping device assembly 4, and a slide rail 5;

[0006] The fixed base 1 includes a flat base and a bracket, and the bracket is fixed to one side of the flat base;

[0007] The sliding base 2 is symmetrical with the bracket structure fixed to the base 1, and is located on the other side of the flat base. It can be moved left and right through the rectangular slide groove at the bottom to adjust the distance from the bracket;

[0008] The limit block 3 is located outside the sliding base 2 and connected to the fixed base 1 to limit the sliding base 2;

[0009] The slide rails 5 are respectively located on the bracket of the fixed base 1 and the top plane of the sliding base 2;

[0010] The displacement clamping device assembly 4 is located on the slide rail 5, and includes a slider 6, a support rod A7, a support rod B8, a displacement meter clamping device 9 and a displacement meter 10, with the slider 6 as the support point; the slider 6 moves through the slide rail 5 to realize the axial positioning function of the displacement clamping device assembly 4 along the shell to be tested; the support rod A7 and the support rod B8 are locked to realize the variation of the total arm length within a certain range; the tail end of the support rod B8 is hinged to the displacement meter clamping device 9; the displacement meter 10 is clamped and locked by a pair of displacement meter clamping devices 9.

[0011] Furthermore, the flat plate base of the fixed base 1 is a metal flat plate, the middle of which is a rectangular slide rail groove, and equidistant threaded holes are arranged on both sides of the rectangular slide rail groove.

[0012] Furthermore, the fixed base 1 bracket and the sliding base 2 are both made of metal profiles by welding or splicing with hinge blocks and screws.

[0013] Furthermore, the bracket of the fixed base 1 and the top flat plate of the sliding base 2 are both engraved with distance scales with corresponding values, which are used to achieve rapid positioning of the displacement testing device.

[0014] Furthermore, the flat base 1 is connected to the ground by anchor bolts or the base is equipped with supporting base casters.

[0015] Furthermore, the front end of the support rod A7 is a connecting through hole, and the rear end is a rounded rectangular through groove.

[0016] Furthermore, the front end of the support rod B8 is a connecting through hole, and a long groove is opened along the middle surface to ensure the flexibility of the front end of the support rod B8 along the thickness direction.

[0017] Furthermore, the displacement meter includes contact type and non-contact type.

[0018] Furthermore, the method of using the tooling is:

[0019] The angle between the fixed base 1 and the bracket contacting the sliding base 2 and the shell to be tested is set to 2α. When the radius of the cylinder section of the shell to be tested before the hydraulic test is R, and the radius change after pressure is R'; then the geometric relationship between the radial displacement change ΔR and the indication change ΔL of the displacement meter is ΔR=ΔL / (1 / sinα+1), completing the collection of displacement during the hydraulic test.

[0020] Compared with the prior art, the beneficial technical effects of the present invention are:

[0021] (1) The displacement acquisition method of the present invention is efficient and accurate. The radial displacement of the shell can be acquired without arranging a strain acquisition device on the opposite side. The displacement measurement point is easily located and the acquired displacement data is highly reliable.

[0022] (2) The present invention facilitates strain collection during displacement collection. The skeleton structure is used to facilitate the strain collection requirements of each quadrant measuring point during shell testing. The movement of the sliding base can solve the testing of shells in a wider range of projectile diameters and can meet the displacement collection requirements of multiple points.

[0023] (3) The present invention has good structural stability, high durability and long service life. The steel profiles used in the device have good load-bearing performance, and the skeleton structure can avoid the explosion impact that may occur during the hydraulic process of the shell to a certain extent. The displacement test system can be disassembled and has good interchangeability when the device is damaged;

[0024] (4) The present invention has good economic efficiency and high process maturity. Its support frame can be prepared using directly purchased steel profiles, the slide rails can be directly purchased, and the connection methods all use common screws, nuts, welding, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an isometric view of the displacement collection tooling during the hydraulic test of the solid rocket engine casing of the present invention.

[0026] Figure 2 It is a left view of the displacement collection tooling during the hydraulic test of the solid rocket engine casing of the present invention.

[0027] Figure 3 It is a partial detail diagram of the displacement clamping device in the displacement collection tooling during the hydraulic test of the solid rocket engine casing of the present invention.

[0028] Figure 4 It is a schematic diagram of the design principle of the displacement collection tooling during the hydraulic test of the solid rocket engine casing of the present invention.

[0029] The accompanying drawings are marked as follows: 1. fixed base; 2. sliding base; 3. limit block; 4. displacement clamping device assembly; 5. slide rail; 6. slider; 7. support rod A; 8. support rod B; 9. displacement meter clamping device; 10. displacement meter. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] like Figure 1 Isometric view of displacement acquisition tooling during hydraulic testing of solid rocket motor casing and Figure 2As shown in the left view of the tooling for collecting displacement during hydraulic testing of a solid rocket engine casing, a tooling for collecting displacement during hydraulic testing of a solid rocket engine casing of the present invention includes a fixed base 1, a sliding base 2, a limit block 3, a displacement clamping device assembly 4, a slide rail 5, and other connectors and fasteners.

[0032] The fixed base 1 includes a flat base, and is connected to a bracket on one side of the surface. The bracket is made of metal profiles, and the profiles are connected by welding or hinge blocks with screws. The flat plate at the top of the bracket is engraved with a distance scale for rapid positioning of the displacement test device. In one embodiment, the fixed base 1 is composed of a flat base and a bracket on one side. The bracket is welded from 45# steel profiles, and the flat plate bracket at the top of the bracket is engraved with a distance scale, with a minimum scale of 1mm.

[0033] The bottom of the bracket is a metal flat base, with a rectangular slide groove in the middle of the flat base, and a number of equidistant threaded holes on both sides of the groove. In one embodiment, the flat base has two rectangular slide grooves in the middle, and 5 rows of 20mm equidistant threaded holes on both sides of the groove. The base is 1500mm long and 1000mm wide, which can well meet the use of shells with a bullet diameter of 150mm to 800mm and a length of 200mm to 3000mm in actual use.

[0034] The bottom of the flat base is connected to the ground through anchor bolts, which has the advantages of low cost, long service life and good load-bearing performance. When the connection is replaced with a base equipped with supporting base casters, it has the functions of height adjustment, movement and locking.

[0035] The structure of the sliding base 2 is similar to the bracket of the fixed base 1. For example, except for the fixing method, it is symmetrical with the outer structure of the bracket. It is installed on the other side of the surface of the fixed base 1 opposite to the bracket, and two rectangular slide rails are opened at the bottom to cooperate with the fixed base 1 to realize the left and right movement of the sliding base 2 and adjust the distance from the bracket. The type of the slide rail can be adaptively replaced according to the actual load-bearing requirements.

[0036] In one embodiment, the sliding base 2 is in the shape of a bracket and is made of metal profiles. The flat plate at the top of the bracket is engraved with a distance scale. The scale value corresponds to the scale on the upper flat plate of the fixed base 1. When the strain acquisition device is positioned, the scales on both sides are kept uniform to ensure the consistency in the horizontal direction and the centering of the displacement test device. There are two rectangular slide rails at the bottom for use with the fixed base 1 to realize the left and right movement of the sliding base.

[0037] The limiting block 3 is substantially L-shaped and connected to the fixed base 1 with a set screw to limit the movement of the sliding base 2.

[0038] like Figure 3As shown in the partial detail diagram of the displacement clamping device in the displacement collection tooling during the hydraulic test of the solid rocket engine casing, the displacement clamping device assembly 4 is composed of a slider 6, a support rod A7, a support rod B8, and a displacement meter clamping device 9, wherein the slider 6 cooperates with the slide rail 5 to realize the free positioning function of the displacement clamping device assembly 4 along the axial direction of the casing to be tested, and can be quickly and accurately positioned in conjunction with a scale ruler.

[0039] The support rod A7 has a connecting hole at the front end and a rounded rectangular groove at the rear end. The support rod B8 has a connecting hole at the front end and a groove of a certain length along the middle surface, which can ensure the flexibility of the front end of the support rod B8. The cooperation of the two can realize the variation of the total arm length within a certain range, and the locking between the two is achieved through a screw-washer nut structure.

[0040] The rear end of the support rod B8 is hinged to the displacement meter clamping device 9, and a pair of displacement meter clamping devices 9 cooperate with the screw-nut structure to realize the clamping and locking function of the displacement meter 10. The displacement meter can be selected as contact type or non-contact type according to the usage.

[0041] like Figure 4 As shown in the schematic diagram of the displacement acquisition tooling design during the hydraulic test of the solid rocket engine case, the main principle of the tooling design is to set an angle 2α between the fixed base 1 and the sliding base 2 and the bracket in contact with the shell to be tested. When the radius of the hydraulic front barrel section of the shell to be tested is R, the radius change after pressure is R'; then the geometric relationship between the radial displacement change ΔR and the indication change ΔL of the displacement meter is ΔR = ΔL / (1 / sinα+1), in the example α = 30°, ΔR = ΔL / 3.

[0042] The present invention can effectively solve the problems of rigid body displacement and displacement measuring point offset of the solid rocket engine casing and similar cylindrical pressure-bearing structural parts during hydraulic testing, and can accurately detect the radial displacement change of the solid rocket engine casing during the load-bearing process. Its specific advantages are as follows: (1) The displacement acquisition system is easy to operate, with high displacement acquisition efficiency and accuracy. The radial displacement of the casing can be acquired without arranging a strain acquisition device on the opposite side. The displacement measurement point is easy to locate and the collected displacement data is highly reliable, which can meet the requirements of multi-point displacement acquisition. (2) It is convenient for strain acquisition during displacement acquisition, and the skeleton structure is used for convenience. The strain collection requirements of each quadrant measuring point during the shell test; (3) Good applicability. The movement of the sliding base can solve the testing of shells in a wider range of bullet diameters; (4) Good structural stability, high durability, and long service life. The metal profiles used in the device have good load-bearing performance, and the skeleton structure can avoid the blasting impact that may occur during the shell hydraulic process to a certain extent. The displacement test system can be disassembled and has good interchangeability when the device is partially damaged; (5) Good economy and high process maturity. The support frame can be prepared using directly purchased metal profiles, the slide rails can be directly purchased, and the connection methods all use common screws, nuts, welding, etc.

[0043] The contents not described in detail in this specification belong to the prior art known to those skilled in the art. It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A tool for collecting displacement during hydraulic testing of a solid rocket engine casing, characterized in that: It comprises a fixed base (1), a sliding base (2), a limit block (3), a displacement clamping device assembly (4), and a slide rail (5); The fixed base (1) comprises a flat base and a bracket, wherein the bracket is fixed to one side of the flat base; The sliding base (2) is symmetrical with the bracket structure fixed to the base (1), is located on the other side of the flat base, and can be moved left and right through the rectangular slide groove at the bottom to adjust the distance from the bracket; The limit block (3) is located outside the sliding base (2), connected to the fixed base (1), and is used to limit the sliding base (2); The slide rails (5) are respectively located on the bracket of the fixed base (1) and the top plane of the sliding base (2); The displacement clamping device assembly (4) is located on the slide rail (5), and comprises a slider (6), a support rod A (7), a support rod B (8), a displacement meter clamping device (9) and a displacement meter (10), with the slider (6) as a support point; the slider (6) moves through the slide rail (5) to realize the axial positioning function of the displacement clamping device assembly (4) along the shell to be measured; the support rod A (7) and the support rod B (8) are locked to realize the change of the total arm length within a certain range; the rear end of the support rod B (8) is hinged to the displacement meter clamping device (9); the displacement meter (10) is clamped and locked by a pair of displacement meter clamping devices (9).

2. The tooling for collecting displacement during hydraulic testing of a solid rocket engine casing according to claim 1, characterized in that: The flat plate base of the fixed base (1) is a metal flat plate, the middle of which is a rectangular slide rail groove, and both sides of the rectangular slide rail groove are provided with equidistant threaded holes.

3. The tooling for collecting displacement during hydraulic testing of a solid rocket engine casing according to claim 1, characterized in that: The fixed base (1) bracket and the sliding base (2) are both made of metal profiles by welding or splicing with hinge blocks and screws.

4. The tooling for collecting displacement during hydraulic testing of a solid rocket engine casing according to claim 1, characterized in that: The bracket of the fixed base (1) and the top flat plate of the sliding base (2) are both engraved with distance scales with corresponding values, which are used to achieve rapid positioning of the displacement test device.

5. The tooling for collecting displacement during hydraulic testing of a solid rocket engine casing according to claim 1, characterized in that: The connection mode between the flat base (1) and the ground is by anchor bolts or the base is equipped with supporting base casters.

6. The tooling for collecting displacement during hydraulic testing of a solid rocket engine casing according to claim 1, characterized in that: The front end of the support rod A (7) is a connecting through hole, and the rear end is a rounded rectangular through groove.

7. The tooling for collecting displacement during hydraulic testing of a solid rocket engine casing according to claim 1, characterized in that: The front end of the support rod B (8) is a connecting through hole, and a long groove is opened along the middle surface to ensure the flexibility of the front end of the support rod B (8) along the thickness direction.

8. The tooling for collecting displacement during hydraulic testing of a solid rocket engine casing according to claim 1, characterized in that: The displacement meter includes contact type and non-contact type.

9. The tooling for collecting displacement during hydraulic testing of a solid rocket engine casing according to claim 1, characterized in that: The method of using the tooling is as follows: The angle between the fixed base (1) and the bracket contacting the sliding base (2) and the shell to be tested is set to 2α. When the radius of the cylinder section of the shell to be tested before the hydraulic test is R, and the radius change after the pressure is R', the geometric relationship between the radial displacement change ΔR and the indication change ΔL of the displacement meter is ΔR=ΔL / (1 / sinα+1), and the displacement collection during the hydraulic test is completed.

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