Universal clamp for acceleration test of projectile and rocket products

Abstract

The invention belongs to the technical field of mechanical tests, and particularly relates to a universal clamp for acceleration tests of projectile products, which comprises a lower bottom plate (2), side plates (1), an upper bottom plate (12), two cross beams (6) and a square steel pipe (7), in the invention, after a projectile product is hung on the launcher, the launcher is hung 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 extruding the fixing gaskets (10). The bottom plate (2) and the side plate (1) of the universal clamp are fixed on a mounting table top of acceleration test equipment, and different fixed surfaces are restrained by rotating the clamp, so that the test requirements of three axes and six directions are met.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical testing, and in particular relates to a universal fixture for acceleration testing of missile products. Background Art

[0002] Acceleration environment usually generates inertial loads on the mounting brackets of weapons and equipment and inside the equipment. Changes in the speed of the carrier platform will induce acceleration values ​​of different magnitudes, which may cause deformation of the weapon structure, loosening of fasteners, breakage of brackets, jamming of actuators, short circuit or open circuit of electronic circuit boards, etc. Acceleration tests generally use acceleration test equipment, which uses a frequency converter to adjust the speed of the asynchronous motor. Through gear transmission, the test piece installed at both ends of the swing arm rotates horizontally around the main axis, thereby generating centrifugal acceleration with constant value and constant direction relative to the test piece. This acceleration always points to the center of the shaft along the diameter of the swing arm, so that the test piece is subjected to an inertial load opposite to the acceleration direction, achieving the purpose of simulating stable acceleration assessment.

[0003] Acceleration tests are applicable to equipment installed on aircraft, helicopter external attachments and ground-launched missiles. During the acceleration test, the test product should be fixed on the installation fixture or test machine to simulate the fixing conditions in actual use. No other fixed constraints should be added to ensure that the constraints and mass distribution are similar to the actual installation to ensure the accuracy of the test results. It is understood that most domestic laboratories use flat fixtures to clamp when conducting acceleration tests in the four directions of forward, backward, left and right, which can meet the requirements of military standards and national standards. However, when conducting acceleration tests in the upward and downward directions, they use crimping products to conduct tests. This practice does not meet the standard requirements and is not in line with the actual installation status. It will affect the accuracy of the test results, especially for missile products, which need to be tested together with their launchers during the test. Since the rotating arm only has a horizontal table surface but no vertical table surface, and there is no specific fixture, it cannot meet the three-axis six-direction test requirements of the product. If the existing installation method in the laboratory is used, the installation is difficult and the risk is high. The crimping torque is large, and the product is easily fallen off, causing damage to the product and causing significant losses. Therefore, the problem of rapid axial change must be solved by reasonably designing tooling and fixtures. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The technical problem to be solved by the present invention is: how to provide a universal fixture for acceleration testing of projectile and arrow products.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a universal fixture for acceleration testing of missile products, the fixture comprising: a lower base plate (2), a side plate (1), an upper base plate (12), two cross beams (6), and a square steel tube (7);

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

[0009] The four square steel tubes (7) are arranged in groups of two, and the top ends of the square steel tubes (7) of a group are connected via a horizontally arranged upper bottom plate (12); and a side plate (1) is arranged on the side of one group of square steel tubes (7);

[0010] The two ends of the two upper bottom plates (12) are connected at the corresponding ends by a cross beam (6); thus, two cross beams (6) parallel to each other are arranged on the upper parts of the two upper bottom plates (12);

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

[0012] A bidirectional bolt (9) is respectively arranged on both sides of each mounting hole (5);

[0013] The top end of the bidirectional bolt (9) is spherical and is hinged to the fixing gasket (10) so that the fixing gasket (10) can rotate freely.

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

[0015] Wherein, the location where the structural stress of the clamp is likely to be concentrated is reinforced by reinforcing ribs (3).

[0016] The portion where the square steel tube (7) and the lower base plate (2) are joined is reinforced by reinforcing ribs (3).

[0017] When an acceleration test is conducted on a product with a missile launcher, during the test, the launcher is mounted on a fixture through a mounting hole (5) and a fixing hole (11) on a base plate (2), and four bidirectional bolts (9) are used to limit the position of the missile launcher to prevent the launcher from shaking during the test, thereby causing the structure to be subjected to concentrated force, resulting in plastic deformation or even damage.

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

[0019] The bottom plate (2) is mounted on a table of an acceleration test device, and tests in the ±X and ±Z directions can be performed.

[0020] The side plate (1) is mounted on the table of the acceleration test equipment, and tests in the ±Y directions can be performed, thereby meeting the requirements of three-axis six-directional tests.

[0021] After the missile product is hung on the launcher, the launcher is set on the universal clamp through the installation hole (5) and the fixing hole (11), the two-way bolts (9) on the four ears (8) of the launcher are adjusted, and the launcher is firmly fixed on the universal clamp by squeezing the fixing gasket (10).

[0022] The bottom plate (2) and the side plate (1) of the universal fixture are fixed on the mounting table of the acceleration test equipment, and different fixed surfaces are constrained by rotating the fixture to meet the three-axis six-directional test requirements.

[0023] (III) Beneficial effects

[0024] Compared with the prior art, in the present invention, after the missile product is hung on the launcher, the launcher is hung on the universal fixture through the mounting hole (5), the bidirectional bolts (9) on the four ear pieces (8) of the launcher are adjusted, and the launcher is firmly fixed on the universal fixture by squeezing the fixing gasket (10). The bottom plate (2) and the side plate (1) of the universal fixture are fixed on the mounting table of the acceleration test equipment, and the different fixing surfaces are constrained by rotating the fixture to meet the three-axis six-directional test requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 , Figure 2 It is a schematic diagram of the structure of the technical solution of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0027] In order to solve the above technical problems, the present invention provides a universal fixture for acceleration test of missile products, the fixture comprising: a lower base plate (2), a side plate (1), an upper base plate (12), two cross beams (6), a square steel tube (7),

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

[0029] The four square steel tubes (7) are arranged in groups of two, and the top ends of the square steel tubes (7) of a group are connected via a horizontally arranged upper bottom plate (12); and a side plate (1) is arranged on the side of one group of square steel tubes (7);

[0030] The two ends of the two upper bottom plates (12) are connected at the corresponding ends by a cross beam (6); thus, two cross beams (6) parallel to each other are arranged on the upper parts of the two upper bottom plates (12);

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

[0032] A bidirectional bolt (9) is respectively arranged on both sides of each mounting hole (5);

[0033] The top end of the bidirectional bolt (9) is spherical and is hinged to the fixing gasket (10) so that the fixing gasket (10) can rotate freely.

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

[0035] Wherein, the location where the structural stress of the clamp is likely to be concentrated is reinforced by reinforcing ribs (3).

[0036] The portion where the square steel tube (7) and the lower base plate (2) are joined is reinforced by reinforcing ribs (3).

[0037] When an acceleration test is conducted on a product with a missile launcher, during the test, the launcher is mounted on a fixture through a mounting hole (5) and a fixing hole (11) on a base plate (2), and four bidirectional bolts (9) are used to limit the position of the missile launcher to prevent the launcher from shaking during the test, thereby causing the structure to be subjected to concentrated force, resulting in plastic deformation or even damage.

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

[0039] The bottom plate (2) is mounted on a table of an acceleration test device, and tests in the ±X and ±Z directions can be performed.

[0040] The side plate (1) is mounted on the table of the acceleration test equipment, and tests in the ±Y directions can be performed, thereby meeting the requirements of three-axis six-directional tests.

[0041] After the missile product is hung on the launcher, the launcher is set on the universal clamp through the installation hole (5) and the fixing hole (11), the two-way bolts (9) on the four ears (8) of the launcher are adjusted, and the launcher is firmly fixed on the universal clamp by squeezing the fixing gasket (10).

[0042] The bottom plate (2) and the side plate (1) of the universal fixture are fixed on the mounting table of the acceleration test equipment, and different fixed surfaces are constrained by rotating the fixture to meet the three-axis six-directional test requirements.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A universal fixture for acceleration test of missile products, characterized in that: The clamp comprises: a lower base plate (2), a side plate (1), an upper base plate (12), two cross beams (6), and a square steel pipe (7); Below the horizontal position of the lower base plate (2), four square steel pipes (7) are arranged vertically upward at the four corners; The four square steel tubes (7) are arranged in groups of two, and the top ends of the square steel tubes (7) of a group are connected via a horizontally arranged upper bottom plate (12); and a side plate (1) is arranged on the side of one group of square steel tubes (7); The two ends of the two upper bottom plates (12) are connected at the corresponding ends by a cross beam (6); thus, two cross beams (6) parallel to each other are arranged on the upper parts of the two upper bottom plates (12); Mounting holes (5) are provided at corresponding positions in the middle of the two cross beams (6); A bidirectional bolt (9) is respectively arranged on both sides of each mounting hole (5); The top end of the bidirectional bolt (9) is spherical and is hinged to the fixing gasket (10) so that the fixing gasket (10) can rotate freely.

2. The universal fixture for the acceleration test of missile products as claimed in claim 1, characterized in that: Each cross beam (6) is fixed to one end of the same side of the two upper base plates (12) by means of eight bolts (4).

3. The universal fixture for the acceleration test of missile products as claimed in claim 1, characterized in that: The locations where the structural stress of the clamp is likely to be concentrated are reinforced by reinforcing ribs (3).

4. The universal fixture for the acceleration test of missile products as claimed in claim 3, characterized in that: The portion where the square steel tube (7) and the lower base plate (2) are joined is reinforced by reinforcing ribs (3).

5. The universal fixture for the acceleration test of missile products as claimed in claim 1, characterized in that: When an acceleration test is performed on a product with a missile launcher, the launcher is installed on a fixture through a mounting hole (5) and a fixing hole (11) on a bottom plate (2) during the test, and four bidirectional bolts (9) are used to limit the position of the missile launcher to prevent the launcher from shaking during the test, causing the structure to be stressed, resulting in plastic deformation or even damage.

6. The universal fixture for the acceleration test of missile products as claimed in claim 5, characterized in that: The top end of the bidirectional bolt (9) is spherical and is hinged to the fixing gasket (10), so that the fixing gasket (10) can rotate freely, thereby achieving the function of fine-tuning and determining the installation direction according to the different shapes of the launcher interface.

7. The universal fixture for the acceleration test of missile products as claimed in claim 1, characterized in that: The base plate (2) is mounted on the table of the acceleration test equipment, and tests in the ±X and ±Z directions can be performed.

8. The universal fixture for the acceleration test of missile products as claimed in claim 7, characterized in that: By mounting the side plate (1) on the table of the acceleration test equipment, tests in the ±Y directions can be carried out, thereby meeting the requirements of the three-axis six-direction test.

9. The universal fixture for the acceleration test of missile products as claimed in claim 5, characterized in that: After hanging the missile product on the launcher, the launcher is set on the universal clamp through the mounting hole (5) and the fixing hole (11), the bidirectional bolts (9) on the four ears (8) of the launcher are adjusted, and the launcher is firmly fixed on the universal clamp by squeezing the fixing gasket (10).

10. The universal fixture for the acceleration test of missile products as claimed in claim 9, characterized in that: The bottom plate (2) and the side plate (1) of the universal fixture are fixed on the installation table of the acceleration test equipment. By rotating the fixture, different fixed surfaces are constrained to meet the three-axis six-directional test requirements.

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