A moving coil self-locking type three-axis vibration test system

Abstract

The present invention discloses a moving coil self-locking three-axis vibration test system, which includes an overall support, a vibration table, a moving coil body, a chuck, an isolation air spring and a clamping head. The vibration table is installed on the upper surface of the overall support. The moving coil body is installed on the right surface of the air spring support, and the chuck is bolted to the right surface of the moving coil body. A transfer piece is installed on the right surface of the chuck. The isolation air spring is threadedly connected to the lower surface of the overall support. The clamping head is fixedly connected to the outer surface of the transfer piece by a socket head cap screw. An installation seat is arranged on the outer surface of the chuck. For this moving coil self-locking three-axis vibration test system, with the vibration table, air spring support, guiding mechanism, moving coil body, chuck, transfer piece, plain bearing, working platform and isolation air spring provided, the safety and practicability of the whole system can be higher.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-dimensional vibration testing, and specifically to a moving coil self-locking three-axis vibration testing system. Background Art

[0002] The multi-axis vibration testing technology is an advanced testing technology. At present, the multi-dimensional vibration equipment at home and abroad is mainly three degrees of freedom, and most of the equipment is built with three orthogonally distributed ordinary vibration tables and decoupling devices. The decoupling devices for movement are usually hinge-supported connecting rods, cross-shaped mechanical guides, and spherical bearings.

[0003] In addition to conducting multi-axial vibration tests, the three-axis vibration testing system is often required to conduct single-direction vibration tests separately. Compared with using a single vibration table, using a multi-dimensional vibration system has the following advantages: ① Only one clamping of the test piece is required to conduct single-axis tests in multiple directions; ② For one test piece, generally only one tooling or fixture needs to be processed. Therefore, using a multi-dimensional vibration testing system for single-axis tests greatly reduces the time cost and economic cost of the test.

[0004] However, there are the following problems when using a multi-dimensional vibration testing system to conduct single-axis tests separately:

[0005] ① The support foundation in the non-moving direction of the working platform is not a rigid foundation, and the moving coil body in the non-moving direction can move freely. When the X-direction moving coil body vibrates alone, the Y-direction moving coil body can still move vertically, resulting in inevitable angular vibration of the working platform, which may lead to over-testing or under-testing, or test failure due to too large differences in vibration data;

[0006] ② If spherical bearings are not used for decoupling, but flat bearings or cross-shaped mechanical guides are used for decoupling, the guiding of the moving coil body will be subject to a large overturning moment.

[0007] ③ Some special test pieces need to perform test operations such as vibration table shutdown and ignition, shutdown and explosion, and shutdown and dropping.

[0008] Therefore, we propose that the moving coil self-locking three-axis vibration testing system can well solve the above problems. Summary of the Invention

[0009] The object of the present invention is to provide a moving coil self-locking type three-axis vibration test system to solve the problems proposed in the above background technology. Currently, in the market, when using a multi-dimensional vibration test system to conduct single-axis tests separately, the support foundation in the non-moving direction of the working platform is not a rigid foundation, and the moving coil body in the non-moving direction can move freely. When the X-direction moving coil body vibrates alone, the Y-direction moving coil body can still move vertically, resulting in inevitable angular vibration of the working platform, which may lead to over-testing or under-testing, or test failure due to too large differences in vibration data. Moreover, if spherical bearings are not used for decoupling, but flat bearings or cross-shaped mechanical guide rails are used for decoupling, the guiding of the moving coil body will be subject to a large overturning moment, and some special test pieces need to perform test operations such as vibration table shutdown ignition, shutdown explosion, and shutdown delivery.

[0010] To achieve the above object, the present invention provides the following technical solution: A moving coil self-locking type three-axis vibration test system includes an overall bracket, a vibration table, a moving coil body, a chuck, a vibration isolation air spring, and a clamping head. The upper surface of the overall bracket is provided with a vibration table, and an air spring support is fixedly connected inside the vibration table. Moreover, a guiding mechanism is installed inside the vibration table. The right surface of the air spring support is provided with a moving coil body, and the moving coil body and the adapter are fixedly installed through bolts. The chuck is installed on the outer surface of the vibration table through a mounting seat. Moreover, the right surface of the adapter is threadedly connected with a plain bearing, and the right end of the plain bearing is threadedly connected with a fixed working platform. The lower surface of the overall bracket is threadedly connected with a vibration isolation air spring. The outer surface of the adapter is fixedly connected with a clamping head through a socket head cap screw. The outer surface of the chuck is provided with a mounting seat.

[0011] Preferably, there are three groups of vibration tables, and the three groups of vibration tables are perpendicular to each other, and the vibration tables correspond to the working platforms one by one.

[0012] Preferably, the moving coil body, the air spring support, the guiding mechanism, the overall bracket, and the vibration isolation air spring all form an elastic structure, and the vibration isolation frequency of this elastic structure is less than 2HZ.

[0013] Preferably, the included angle between the movement direction of the jaws on the chuck and the movement axis of the moving coil body is 45°, and the moving coil body and the guiding mechanism form a rotating structure.

[0014] Preferably, the upper and lower surfaces of the plain bearing are both connecting surfaces, and the plain bearing is connected to the moving coil bodies of the three vibration tables through three adapters on the X, Y, and Z axes in the space coordinate system.

[0015] Preferably, the outer surface of the clamping head is cylindrical, and the connection method between the clamping head and the jaws of the chuck is an inlay connection, and four groups of jaws of the chuck are arranged at equal angles.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The dynamic coil self-locking triaxial vibration test system is equipped with a vibration table, air spring support, guide mechanism, dynamic coil body, chuck, adapter, plane bearing, working platform and vibration isolation air spring. Plane bearings are used instead of spherical bearings as decoupling devices. The vibration table is designed with a constraint mechanism of the dynamic coil body. According to the pneumatic principle of the constraint mechanism, the constraint mechanism is connected to the power amplifier for synchronous control. The system can perform triaxial, biaxial and uniaxial vibrations; reduce the additional angular vibration of the table: plane bearings are used instead of spherical bearings, which can self-constrain the overturning / rolling / pitch degrees of freedom and suppress the generation of additional angular vibrations; improve the uniformity and transverse vibration ratio of the working table: when performing biaxial and uniaxial vibrations, the constraint mechanism of the dynamic coil body can lock the dynamic coil body, making the dynamic coil body in the non-moving direction a rigid or quasi-rigid foundation. In the test, the coupled vibration of the dynamic coil body in the non-moving direction is greatly reduced, thereby improving the vibration uniformity and transverse vibration ratio of the table. The dynamic coil body constraint component can automatically constrain or release the degrees of freedom of the dynamic coil body according to the working state of the vibration table. When the system is working, the dynamic body constraint assembly does not occupy the thrust of the vibration table. Some special test pieces need to perform test operations such as vibration table shutdown ignition, shutdown explosion, and shutdown release. The dynamic body suspension of the general vibration table is not enough to withstand the load, which limits the test. The triaxial vibration test system can meet the above test requirements due to the dynamic body constraint assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the top view structure of the present invention;

[0019] Figure 2 It is a front view structural schematic diagram of the present invention;

[0020] Figure 3 It is a schematic diagram of the top view of the structure of the adapter of the present invention;

[0021] Figure 4 This is a schematic diagram of the front view structure of the chuck of the present invention;

[0022] Figure 5 It is a right side structural schematic diagram of the chuck of the present invention;

[0023] Figure 6 This is a schematic diagram of the chuck constraint state structure of the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of the present invention in a state where the chuck is released from restraint;

[0025] Figure 8 It is a schematic diagram of the control structure of the chuck of the present invention.

[0026] In the figure: 1. Overall support; 2. Vibration table; 3. Air spring support; 4. Guide mechanism; 5. Moving coil body; 6. Chuck; 7. Adapter; 8. Plain bearing; 9. Working platform; 10. Vibration isolation air spring; 11. Clamping head; 12. Socket head cap screw; 13. Mounting seat. Detailed implementation mode

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figure 1-8 , the present invention provides a technical solution: a moving coil self-locking type three-axis vibration test system, including an overall support 1, a vibration table 2, an air spring support 3, a guide mechanism 4, a moving coil body 5, a chuck 6, an adapter 7, a plain bearing 8, a working platform 9, a vibration isolation air spring 10, a clamping head 11, a socket head cap screw 12 and a mounting seat 13. The vibration table 2 is installed on the upper surface of the overall support 1, and the air spring support 3 is fixedly connected inside the vibration table 2, and the guide mechanism 4 is installed inside the vibration table 2. The moving coil body 5 is installed on the right side surface of the air spring support 3. The moving coil body 5 and the adapter 7 are fixedly installed by bolts. The chuck 6 is installed on the outer surface of the vibration table 2 through the mounting seat. The right side surface of the adapter 7 is threadedly connected with the plain bearing 8, and the right end of the plain bearing 8 is threadedly connected with the working platform 9 fixed. The vibration isolation air spring 10 is threadedly connected to the lower surface of the overall support 1. The clamping head 11 is fixedly connected to the outer surface of the adapter 7 through the socket head cap screw 12. The mounting seat 13 is arranged on the outer surface of the chuck 6.

[0029] There are three groups of vibration tables 2, and the 3 groups of vibration tables 2 are perpendicular to each other, and the vibration tables 2 and the working platform 9 correspond one by one, so that the system can perform three-axis, two-axis and single-axis vibrations, improving the practicability of the entire device.

[0030] The moving coil body 5 forms an elastic structure with the guide mechanism 4 through the air spring support 3, and with the overall support 1 and the vibration isolation air spring 10. The vibration isolation frequency of this elastic structure is less than 2HZ, improving the uniformity and transverse vibration ratio of the workbench surface: when performing two-axis and single-axis vibrations, the constraint mechanism of the moving coil body 5 can lock the moving coil body 5, making the moving coil body 5 in the non-moving direction become a rigid or quasi-rigid foundation. In the test, the coupled vibration of the moving coil body 5 in the non-moving direction is greatly reduced, thereby improving the vibration uniformity and transverse vibration ratio of the tabletop.

[0031] The included angle between the moving direction of the jaws on the chuck 6 and the moving axis of the moving coil body 5 is 45°. Moreover, the moving coil body 5 and the guiding mechanism 4 form a rotating structure, which can automatically restrict or release the degrees of freedom of the moving coil body 5 according to the working state of the vibration table.

[0032] Both the upper and lower surfaces of the plain bearing 8 are connecting surfaces. And the plain bearing 8 is connected to the moving coil bodies 5 of three vibration tables 2 through three adapters 7 on the X, Y, and Z axes of the space coordinate system, reducing the additional angular vibration of the tabletop: By using the plain bearing 8 instead of the spherical bearing, the degrees of freedom of overturning / rolling / pitching can be self-restricted, suppressing the generation of additional angular vibration.

[0033] The outer surface of the clamping head 11 is cylindrical, and the connection method between the clamping head 11 and the jaws of the chuck 6 is an inlay connection. And there are four groups of jaws on the chuck 6 arranged at equal angles, which can quickly fix the workpiece tightly, facilitating the experiment of the entire device.

[0034] Working principle: When using this moving coil self-locking three-axis vibration test system, first as Figure 7 shown, when the vibration table 2 is in the working state, control the pneumatic chuck 6 to loosen the four jaws of the chuck 6. The moving direction of the jaws has an included angle of 45° with the moving axis of the moving coil body 5. When the jaws are loosened to the limit position, the clamping head 11 on the adapter 7 has a free stroke within the space left by the jaws. The chuck 6 no longer has any restrictive effect on all moving parts and has no mechanical interference with the moving parts in the moving direction;

[0035] As Figure 1-5 shown, the moving coil body 5 restricts the chuck 6 by using a mature pneumatic four-jaw chuck 6, which is fixed on the vibration table 2 with cylindrical head screws 12. The jaws of the chuck 6 can clamp the clamping head 11 on the adapter 7. By controlling the chuck 6, the clamping head 11 can be clamped or loosened, thereby restricting or releasing the degrees of freedom of the moving coil body 5. The moving coil body 5, the air spring support 3, and the guiding mechanism 4 of the vibration table 2 can use the design form of a standard vibration table 2 or different guiding mechanisms 4 can be replaced to enable the moving part to have different anti-overturning capabilities;

[0036] As Figure 6 shown, when the vibration table 2 stops, the moving coil body 5 will be kept in the central position under the action of the centering system. At this time, the jaws of the chuck 6 tighten, clamping the clamping head 11, thereby restricting the movement in this direction;

[0037] As Figure 8As shown, in this system, the moving coil body 5 in each direction is constrained by four pneumatic four-jaw chucks 6. The pneumatic chuck 6 can be controlled to clamp or loosen by a switching valve, and the switching valve is controlled by the power amplifier supporting the vibration table. The control signal for energizing the exciting coil on the vibration table 2 is used to synchronously control the switching valve of the pneumatic chuck 6, achieving the effect that the chuck 6 loosens when the exciting coil is energized and the chuck 6 clamps when the exciting coil is de-energized (The selection of the pneumatic four-jaw chuck 6 as the constraint component for the moving coil body 5 mainly considers the following aspects: ① The pneumatic chuck 6 is convenient for automatic control, while the ordinary chuck 6 requires manual clamping operation each time; ② The clamping force of the pneumatic chuck 6 is large; ③ The clamping force of the pneumatic chuck 6 is persistent, and the compressed gas will ensure that the chuck 6 always has a stable clamping force and will not weaken due to factors such as vibration; ④ The angle between adjacent jaws of the four-jaw chuck 6 is 90°. For the reciprocating moving coil body 5, the loosened jaws can leave enough displacement space for the moving coil body 5 to avoid interference; ⑤ The four-jaw chuck 6 does not have the ability of automatic centering. For the vibration system, the centering accuracy is generally ±2 mm. The four-jaw chuck 6 without the ability of automatic centering can ensure that the moving coil body 5 can be clamped tightly at any position within the accuracy range). This is the moving coil self-locking type three-axis vibration test system. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0038] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A moving coil self-locking type three-axis vibration test system, comprising an integral bracket (1), a vibration table (2), a moving coil body (5), a chuck (6), a vibration isolation air spring (10) and a clamping head (11), characterized in that: The upper surface of the overall bracket (1) is equipped with a vibration table (2), and an air spring support (3) is fixedly connected inside the vibration table (2). Moreover, a guiding mechanism (4) is installed inside the vibration table (2). The right surface of the air spring support (3) is equipped with a moving coil body (5). The moving coil body (5) and the adapter (7) are fixedly installed by bolts. The chuck (6) is installed on the outer surface of the vibration table (2) through a mounting seat. Moreover, a plain bearing (8) is threadedly connected to the right surface of the adapter (7). And a working platform (9) is fixedly connected by threading to the right end of the plain bearing (8). The lower surface of the overall bracket (1) is threadedly connected with a vibration isolation air spring (10). The outer surface of the adapter (7) is fixedly connected with a clamping head (11) by a socket head cap screw (12). An installation seat (13) is arranged on the outer surface of the chuck (6); There are three sets of the vibration tables (2), and the three sets of vibration tables (2) are perpendicular to each other. Moreover, the vibration tables (2) and the working platform (9) are in one-to-one correspondence; The moving coil body (5) and the air spring support (3), the guiding mechanism (4), the overall bracket (1) and the vibration isolation air spring (10) all form elastic structures, and the vibration isolation frequency of this elastic structure is less than 2HZ.

2. The moving coil self-locking type three-axis vibration test system according to claim 1, characterized in that: The included angle between the moving direction of the jaws on the chuck (6) and the movement axis of the moving coil body (5) is 45°. Moreover, the moving coil body (5) and the guiding mechanism (4) form a rotating structure.

3. The moving coil self-locking type three-axis vibration test system according to claim 1, characterized in that: Both the upper and lower surfaces of the plain bearing (8) are connecting surfaces. And the plain bearing (8) is connected to the moving coil bodies (5) of the three vibration tables (2) through three adapters (7) on the X, Y, and Z axes of the space coordinate system.

4. A moving coil self-locking type three-axis vibration test system according to claim 1, characterized in that: The outer surface of the clamping head (11) is cylindrical. And the connection method between the clamping head (11) and the jaws of the chuck (6) is inlay connection. Moreover, the jaws of the chuck (6) are arranged in four groups at equal angles.

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