A universal fixture for acceleration testing of projectiles and rockets

Abstract

This invention belongs to the field of mechanical testing technology, specifically relating to a universal fixture for acceleration testing of projectiles and rockets, comprising: a lower base plate (2), a side plate (1), an upper base plate (12), two crossbeams (6), and a square steel tube (7). In this invention, after the projectile and rocket product is suspended on the launcher, the launcher is suspended on the universal fixture through the mounting holes (5). The bidirectional bolts (9) on the four lugs (8) of the launcher are adjusted, and the launcher is firmly fixed on the universal fixture by squeezing the fixing shims (10). The base plate (2) and side plate (1) of the universal fixture are fixed on the mounting platform of the acceleration testing equipment. By rotating the fixture, different fixing surfaces are constrained to achieve the triaxial and six-axis testing requirements.

Description

Technical Field

[0001] This invention belongs to the field of mechanical testing technology, specifically relating to a universal fixture for acceleration testing of projectiles and rockets. Background Technology

[0002] Acceleration environments typically generate inertial loads on the mounting brackets and inside the equipment. Changes in the platform's speed induce varying degrees of acceleration, potentially leading to structural deformation, loosening of fasteners, bracket breakage, actuator jamming, and short circuits or open circuits in electronic circuit boards. Acceleration testing generally utilizes acceleration testing equipment. This equipment uses a frequency converter to adjust the speed of an asynchronous motor, and through gear transmission, rotates the specimen mounted at both ends of a rotating arm horizontally around a main shaft. This generates a centrifugal acceleration that remains constant in magnitude but in the same direction relative to the specimen. This acceleration always points along the diameter of the rotating arm towards the center of the shaft, subjecting the specimen to an inertial load opposite to the direction of acceleration, thus simulating stable acceleration testing.

[0003] Acceleration testing is applicable to equipment installed on external stores of aircraft and helicopters and ground-launched missiles. During acceleration testing, the test product should be fixed to the mounting fixture or testing machine in a manner that simulates actual use. No additional fixing constraints should be added, and the constraints and mass distribution should be similar to those of actual installation to ensure the accuracy of the test results. It is understood that most domestic laboratories use flat plate clamps to mount products when conducting acceleration tests in the four directions of forward, backward, left, and right, which meets military and national standards. However, when conducting acceleration tests in the two directions of upward and downward, they use a pressing method to test the product. This practice does not meet the standard requirements and does not conform to the actual installation state, which will affect the accuracy of the test results. This is especially true for projectiles and rockets, which need to be tested together with their launchers. Since the rotating arm only has a horizontal platform and no vertical platform, and there are no specific clamps, it cannot meet the three-axis and six-direction testing requirements of the product. If the existing installation methods in the laboratory are used, the installation is difficult, the risk is high, the pressing torque is large, and it is very easy for the product to fall off, causing damage and significant losses. Therefore, it is necessary to solve the problem of rapid axial changes by reasonably designing tooling fixtures. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] The technical problem to be solved by this invention is: how to provide a universal fixture for acceleration testing of projectiles and rockets.

[0006] (II) Technical Solution

[0007] To solve the above technical problems, the present invention provides a universal fixture for acceleration testing of projectiles and rockets, the fixture comprising: a lower base plate (2), a side plate (1), an upper base plate (12), two crossbeams (6), and a square steel tube (7);

[0008] Below the horizontal position of the lower base plate (2), four square steel pipes (7) are vertically installed at the four corners;

[0009] Four square steel pipes (7) are arranged in pairs, and the top of one pair of square steel pipes (7) is connected by a horizontally set upper base plate (12); and, one pair of square steel pipes (7) is provided with a side plate (1) on its side.

[0010] The two ends of the two upper base plates (12) are connected by a crossbeam (6); thus, two parallel crossbeams (6) are set on the upper part of the two upper base plates (12).

[0011] Mounting holes (5) are provided at corresponding positions in the middle of the two crossbeams (6);

[0012] A two-way bolt (9) is provided on both sides of each mounting hole (5);

[0013] The top of the two-way bolt (9) is spherical and hinged to the fixing washer (10), allowing the fixing washer (10) to rotate freely.

[0014] Each crossbeam (6) is fixed to one end of the same side of the two upper base plates (12) by eight bolts (4).

[0015] In particular, the locations where structural stress is prone to concentration in the fixture are reinforced by reinforcing ribs (3).

[0016] Among them, the part where the square steel pipe (7) and the bottom plate (2) are joined is reinforced by reinforcing ribs (3).

[0017] When conducting acceleration tests on products with missile launchers, the launcher is mounted on a fixture through mounting holes (5) and fixing holes (11) on the base plate (2). Four bidirectional bolts (9) limit the missile launcher to prevent it from shaking during the test, causing stress concentration on the structure, resulting in plastic deformation or even damage.

[0018] The top of the bidirectional bolt (9) is spherical and hinged to the fixing washer (10), so that the fixing washer (10) can rotate freely, thereby achieving the function of fine adjustment and determination of the installation direction according to the different shapes of the launcher interface.

[0019] The base plate (2) is installed on the platform of the acceleration test equipment, which can be used to conduct tests in the ±X and ±Z directions.

[0020] Among them, the side plate (1) is installed on the platform of the acceleration test equipment, and tests in the ±Y direction can be carried out, thereby achieving the test requirements of three axes and six directions.

[0021] The projectile is suspended on the launcher, and the launcher is set on the universal fixture through the mounting hole (5) and fixing hole (11). The bidirectional bolts (9) on the four lugs (8) of the launcher are adjusted, and the launcher is firmly fixed on the universal fixture by squeezing the fixing pad (10).

[0022] The base plate (2) and side plate (1) of the general-purpose fixture are fixed on the mounting platform of the acceleration test equipment. By rotating the fixture, different fixed surfaces are constrained to achieve the test requirements of three axes and six directions.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, in this invention, after the projectile product is suspended on the launcher, the launcher is suspended on the universal fixture through the mounting hole (5). The bidirectional bolts (9) on the four lugs (8) of the launcher are adjusted, and the launcher is firmly fixed on the universal fixture by squeezing the fixing shims (10). The base plate (2) and side plates (1) of the universal fixture are fixed on the mounting platform of the acceleration test equipment. By rotating the fixture, different fixing surfaces are constrained to achieve the triaxial and six-axis test requirements. Attached Figure Description

[0025] Figure 1 , Figure 2 This is a schematic diagram of the technical solution of the present invention. Detailed Implementation

[0026] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0027] To solve the above-mentioned technical problems, the present invention provides a universal fixture for acceleration testing of projectiles and rockets, the fixture comprising: a lower base plate (2), a side plate (1), an upper base plate (12), two crossbeams (6), and a square steel tube (7).

[0028] Below the horizontal position of the lower base plate (2), four square steel pipes (7) are vertically installed at the four corners;

[0029] Four square steel pipes (7) are arranged in pairs, and the top of one pair of square steel pipes (7) is connected by a horizontally set upper base plate (12); and, one pair of square steel pipes (7) is provided with a side plate (1) on its side.

[0030] The two ends of the two upper base plates (12) are connected by a crossbeam (6); thus, two parallel crossbeams (6) are set on the upper part of the two upper base plates (12).

[0031] Mounting holes (5) are provided at corresponding positions in the middle of the two crossbeams (6);

[0032] A two-way bolt (9) is provided on both sides of each mounting hole (5);

[0033] The top of the two-way bolt (9) is spherical and hinged to the fixing washer (10), allowing the fixing washer (10) to rotate freely.

[0034] Each crossbeam (6) is fixed to one end of the same side of the two upper base plates (12) by eight bolts (4).

[0035] In particular, the locations where structural stress is prone to concentration in the fixture are reinforced by reinforcing ribs (3).

[0036] Among them, the part where the square steel pipe (7) and the bottom plate (2) are joined is reinforced by reinforcing ribs (3).

[0037] When conducting acceleration tests on products with missile launchers, the launcher is mounted on a fixture through mounting holes (5) and fixing holes (11) on the base plate (2). Four bidirectional bolts (9) limit the missile launcher to prevent it from shaking during the test, causing stress concentration on the structure, resulting in plastic deformation or even damage.

[0038] The top of the bidirectional bolt (9) is spherical and hinged to the fixing washer (10), so that the fixing washer (10) can rotate freely, thereby achieving the function of fine adjustment and determination of the installation direction according to the different shapes of the launcher interface.

[0039] The base plate (2) is installed on the platform of the acceleration test equipment, which can be used to conduct tests in the ±X and ±Z directions.

[0040] Among them, the side plate (1) is installed on the platform of the acceleration test equipment, and tests in the ±Y direction can be carried out, thereby achieving the test requirements of three axes and six directions.

[0041] The projectile is suspended on the launcher, and the launcher is set on the universal fixture through the mounting hole (5) and fixing hole (11). The bidirectional bolts (9) on the four lugs (8) of the launcher are adjusted, and the launcher is firmly fixed on the universal fixture by squeezing the fixing pad (10).

[0042] The base plate (2) and side plate (1) of the general-purpose fixture are fixed on the mounting platform of the acceleration test equipment. By rotating the fixture, different fixed surfaces are constrained to achieve the test requirements of three axes and six directions.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A universal fixture for acceleration testing of projectiles and rockets, characterized in that, The fixture includes: a lower base plate (2), a side plate (1), an upper base plate (12), two crossbeams (6), and a square steel pipe (7); Below the horizontal position of the lower base plate (2), four square steel pipes (7) are vertically installed at the four corners; Four square steel pipes (7) are arranged in pairs, and the top of one pair of square steel pipes (7) is connected by a horizontally set upper base plate (12); and, one pair of square steel pipes (7) is provided with a side plate (1) on its side. The two ends of the two upper base plates (12) are connected by a crossbeam (6); thus, two parallel crossbeams (6) are set on the upper part of the two upper base plates (12). Mounting holes (5) are provided at corresponding positions in the middle of the two crossbeams (6); A two-way bolt (9) is provided on both sides of each mounting hole (5); The top of the two-way bolt (9) is spherical and hinged to the fixing washer (10), so that the fixing washer (10) can rotate freely; When conducting acceleration tests on products with missile launchers, the launcher is mounted on a fixture through mounting holes (5) and fixing holes (11) on the base plate (2). Four bidirectional bolts (9) limit the missile launcher to prevent it from shaking during the test, causing stress concentration on the structure, resulting in plastic deformation or even damage. The base plate (2) is installed on the platform of the acceleration test equipment, and tests can be carried out in the ±X and ±Z directions; The side plate (1) is installed on the platform of the acceleration test equipment, and tests in the ±Y direction can be carried out, thereby achieving the test requirements of three axes and six directions.

2. The universal fixture for acceleration testing of projectiles and rockets as described in claim 1, characterized in that, Each beam (6) is fixed to one end of the same side of the two upper base plates (12) by eight bolts (4).

3. The universal fixture for acceleration testing of projectiles and rockets as described in claim 1, characterized in that, At locations where structural stress is prone to concentration in the fixture, reinforcement is provided by reinforcing ribs (3).

4. The universal fixture for acceleration testing of projectiles and rockets as described in claim 3, characterized in that, The joint between the square steel pipe (7) and the bottom plate (2) is reinforced by reinforcing ribs (3).

5. The universal fixture for acceleration testing of projectiles and rockets as described in claim 1, characterized in that, The top of the bidirectional bolt (9) is spherical and hinged to the fixing washer (10), allowing the fixing washer (10) to rotate freely, thereby achieving the function of fine adjustment and determining the installation direction according to the different shapes of the launcher interface.

6. The universal fixture for acceleration testing of projectiles and rockets as described in claim 1, characterized in that, After suspending the projectile product on the launcher, the launcher is set on the universal fixture through the mounting hole (5) and fixing hole (11). The bidirectional bolts (9) on the four lugs (8) of the launcher are adjusted, and the launcher is firmly fixed on the universal fixture by squeezing the fixing shim (10).

7. The universal fixture for acceleration testing of projectiles and rockets as described in claim 6, characterized in that, The base plate (2) and side plate (1) of the general-purpose fixture are fixed on the mounting platform of the acceleration test equipment. By rotating the fixture, different fixed surfaces are constrained to achieve the test requirements of three axes and six directions.

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