Device for measuring torsional rigidity of sleeve type shock absorber and use method

Abstract

The invention provides a device for measuring the torsional rigidity of a sleeve type shock absorber and a use method. The device comprises a base and a torsion plate. A threaded hole and a boss are machined on the base, and a shock absorber mounting hole, a bearing protruding end and a rotary circular groove are machined on the torsion plate; and the rotary circular groove and the boss are in mutual line contact. The tool is used in cooperation with a universal material testing machine, the reference value of the torsional rigidity of the sleeve type shock absorber can be obtained, the tool is simple in overall structure, convenient to install and low in cost, a butt joint interface for testing equipment does not need to be specially manufactured, and the torsional rigidity treatment process is simple.

Description

Technical Field

[0001] The present invention belongs to the field of structural design, and particularly relates to a device for measuring the torsional stiffness of a sleeve-type shock absorber and a using method thereof. Background Technique

[0002] With the continuous development of the aviation and aerospace fields, the vibration environment adaptability requirements of instruments for inertial guidance, laser weapons, and high-precision optical measurement are constantly increasing. Therefore, most similar precision instrument devices will choose to install shock absorbers to improve the mechanical environment. Among them, sleeve-type shock absorbers are widely used due to their advantages such as small size, convenient installation, and repeated disassembly.

[0003] At the same time, the installation of shock absorbers in the equipment reduces the overall stiffness of the system, thus causing the angular vibration problem of the equipment. A large number of basic theoretical studies and test results of shock absorbers have shown that: in the analysis of angular vibration problems, it is not enough to only consider the axial and lateral stiffness of the shock absorber, and the influence of the torsional stiffness of the shock absorber also needs to be considered. Currently, commonly used sleeve-type shock absorber products generally only provide the stiffness characteristics along the axial and radial directions, and do not provide the torsional stiffness around the axial or radial direction because it is difficult to obtain. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problem that the existing test tooling cannot obtain the torsional stiffness of the sleeve-type shock absorber, and provide a device for measuring the torsional stiffness of the sleeve-type shock absorber and a using method thereof. When used in cooperation with a universal material testing machine, the reference value of the torsional stiffness of the sleeve-type shock absorber can be obtained. The overall structure of the tooling is simple and the installation is convenient.

[0005] The present invention provides a device for measuring the torsional stiffness of a sleeve-type shock absorber, including: a base and a torsion plate.

[0006] Threaded holes and bosses are machined on the base; the threaded holes are used to fix the sleeve-type shock absorber through screws; the bosses are used to support the torsion plate and offset the linear displacement generated by the universal testing machine during the loading process, so that the torsion plate only generates angular displacement during the loading and unloading processes.

[0007] Shock absorber mounting holes, load-bearing protruding ends, and rotary circular grooves are machined on the torsion plate; the shock absorber mounting holes are specifically used to install the sleeve-type shock absorber; the rotary circular grooves and the bosses are in line contact with each other to reduce the sliding friction generated by torsion during the loading process; the load-bearing protruding ends are used to bear the force load or displacement load applied by the electronic universal testing machine.

[0008] The key structural dimensions of a device for measuring the torsional stiffness of a sleeve-type shock absorber according to the present invention are: convex circle radius A, base length B, center distance of the loading end C, torsion plate thickness D, groove radius E, and groove center distance F.

[0009] The size of the convex circle radius A should be less than the groove radius E to ensure that the torsion plate can be twisted under the loading effect.

[0010] The size of the base length B should be greater than four times the groove center distance F.

[0011] The groove radius E should be greater than 0.5 times the thickness D of the torsion plate.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The tooling structure of the present invention is simple, has strong versatility, has no complex components, and some structural parts have certain versatility and interchangeability, and can be applied to measure the torsional stiffness of most sleeve-type shock absorbers;

[0014] 2. The tooling of the present invention does not need to specifically manufacture the docking interface with the test equipment. The torsional stiffness of the test object can be obtained by applying displacement load or force load. The tooling only needs to be placed above the platform of the test equipment, and there is no need to specifically manufacture an adapter interface. Most static loading devices can use this tooling;

[0015] 3. The tooling of the present invention is easy to process, has low cost, has few key dimensions, is easy to design and process, and the overall cost of the tooling is low;

[0016] 4. The process of dealing with the torsional stiffness of the present invention is simple. When used in conjunction with a universal material testing machine, a reference value of the torsional stiffness of the sleeve-type shock absorber can be obtained. The calculation method of the torsional stiffness is simple and clear, and the torsional stiffness test result can be obtained on the test site without a complex post-processing process. Description of the Drawings

[0017] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention:

[0018] Figure 1 is a schematic structural diagram of the base of the embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of the torsion plate of the embodiment of the present invention;

[0020] Figure 3 is a reference diagram of the key dimensions of the base of the embodiment of the present invention;

[0021] Figure 4 is a reference diagram of the key dimensions of the torsion plate of the embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of the usage method of the present invention.

[0023] Wherein: 1 base, 2 torsion plate, 3 threaded hole, 4 boss, 5 shock absorber mounting hole, 6 load-bearing protruding end, 7 rotary circular groove, 8 sleeve-type shock absorber, 9 workbench surface, 10 loading action end Specific embodiments

[0024] In order to enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0025] The present invention provides a device for measuring the torsional stiffness of a sleeve-type shock absorber, including: a base (1) and a torsion plate (2).

[0026] The base (1) is machined with a threaded hole (3) and a boss (4); the threaded hole (3) is used to fix the sleeve-type shock absorber by screws; the boss (4) is used to support the torsion plate (2) to offset the linear displacement generated during the loading process of the universal testing machine, so that the torsion plate (2) only generates angular displacement during the loading and unloading processes.

[0027] The torsion plate (2) is machined with a shock absorber mounting hole (5), a load-bearing protruding end (6) and a rotary circular groove (7); the shock absorber mounting hole (5) is specifically used to install the sleeve-type shock absorber; the rotary circular groove (7) and the boss (4) are in mutual line contact to reduce the sliding friction generated by torsion during the loading process; the load-bearing protruding end (6) is used to bear the force load or displacement load applied by the electronic universal testing machine.

[0028] The key structural dimensions of a simple tooling for measuring the torsional stiffness of a sleeve-type shock absorber of the present invention are: convex circle radius A, base length B, loading end center distance C, torsion plate thickness D, groove radius E, and groove center distance F.

[0029] The size of the convex circle radius A should be smaller than the groove radius E to ensure that the torsion plate can generate torsion under the loading action.

[0030] The size of the base length B should be greater than 4 times the groove center distance F.

[0031] The groove radius E should be greater than 0.5 times the torsion plate thickness D.

[0032] The usage method of a device for measuring the torsional stiffness of a sleeve-type shock absorber of the present invention is as follows:

[0033] The sleeve-type shock absorber (8) is fitted and installed with the mounting hole (5) on the torsion plate (2), and the sleeve-type shock absorber (8) and the torsion plate (2) are fixed to the threaded hole (3) on the base (1) by screws. The fixed tooling is placed on the workbench surface (9) of the universal material testing machine. Control the loading acting end (10) of the universal material testing machine to contact the force-bearing protruding end (6) on the torsion plate (2), and control the universal material testing machine to apply a displacement load to complete the loading process. It is required that the loading displacement H does not exceed the maximum loading displacement G. Then unload until the loading acting end (10) of the universal material testing machine is separated from the force-bearing protruding end (6) on the contact torsion plate (2).

[0034] The calculation method of the maximum loading displacement G in the above-mentioned usage method is as follows:

[0035]

[0036] The torsional movement clearance between the rotary circular groove (7) and the boss (4) should be greater than the maximum loading displacement G, that is:

[0037]

[0038] To improve the accuracy, for the same test object, the above-mentioned usage method needs to be repeated at least 3 times, and the force J obtained from the last measurement is taken as the final result.

[0039] The calculation method of the torsional stiffness I measured by a simple tooling for measuring the torsional stiffness of a sleeve-type shock absorber according to the present invention is as follows:

[0040]

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for measuring the torsional stiffness of a sleeve-type shock absorber, characterized in that: Including a base and a torsion plate; The base is processed with threaded holes and bosses; The torsion plate is processed with a shock absorber mounting hole, a load-bearing protruding end and a rotary circular groove; wherein the rotary circular groove and the boss are in mutual linear contact.

2. The device for measuring the torsional stiffness of a sleeve-type shock absorber according to claim 1, characterized in that: The threaded hole is used to fix the sleeve type vibration absorber by means of screws.

3. The device for measuring the torsional stiffness of a sleeve-type shock absorber according to claim 1, characterized in that: The boss is used to support the torsion plate and offset the linear displacement generated by the universal testing machine during the loading process, so that the torsion plate only generates angular displacement during the loading and unloading process.

4. The device for measuring the torsional stiffness of a sleeve-type shock absorber according to claim 1, characterized in that: The shock absorber mounting hole is specially used for mounting a sleeve type shock absorber.

5. The device for measuring the torsional stiffness of a sleeve-type shock absorber according to claim 1, characterized in that: The load-bearing protruding end is used to bear the force load or displacement load applied by the electronic universal testing machine.

6. The device for measuring the torsional stiffness of a sleeve-type shock absorber according to claim 1, characterized in that: The convex radius above the boss is smaller than the groove radius of the rotating circular groove; the base length is greater than 4 times the groove center distance of the rotating circular groove; the groove radius of the rotating circular groove is greater than 0.5 times the thickness of the torsion plate.

7. A method for using the device for measuring the torsional stiffness of a sleeve-type shock absorber according to any one of claims 1 to 6, characterized in that: The steps include: Install the sleeve-type vibration absorber in conjunction with the mounting holes on the torsion plate, and fix the sleeve-type vibration absorber and the torsion plate to the threaded holes on the base by screws; Place the fixed tooling on the working table of the universal material testing machine, and control the loading end of the universal material testing machine to contact the load-bearing protruding end of the torsion plate; Control the universal material testing machine to apply displacement load to complete the loading process, and the loading displacement H cannot exceed the maximum loading displacement G; The loading end unloaded to the universal material testing machine is separated from the load-bearing protruding end contacting the torsion plate.

8. The method for using the device for measuring the torsional stiffness of a sleeve-type vibration absorber according to claim 7, characterized in that: The calculation method of the maximum loading displacement G is: Among them, C is the distance between the center of the loading end and F is the distance between the center of the groove.

9. The method for using the device for measuring the torsional stiffness of a sleeve-type vibration absorber according to claim 7, characterized in that: The torsional clearance between the rotating circular groove and the boss should be greater than the maximum loading displacement G.

10. A method for using the device for measuring the torsional stiffness of a sleeve-type shock absorber according to any one of claims 7 to 9, characterized in that: The calculation method of torsional stiffness I is: Among them, H is the loading displacement, C is the distance between the loading end and the center, and F is the distance between the groove and the center.

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