Universal multi-degree-of-freedom vibration test tool

Abstract

The invention relates to a universal multi-degree-of-freedom vibration test tool, and belongs to the technical field of vibration environment tests. Comprising a planar motion mechanism, a vertical motion mechanism and a clamping mechanism, the planar motion mechanism is of a horizontally-placed plate-shaped structure. The planar motion mechanism is mounted on the surface of the external vibration table and is fixedly connected with the external vibration table through bolts; the vertical movement mechanism is fixedly connected to the upper surface of the planar movement mechanism; the clamping mechanism is arranged on the vertical movement mechanism; according to the invention, to-be-tested products of different specifications are adapted by adjusting the thickness size of the clamp gasket, the tool generalization is realized, the posture of the to-be-tested product matched with the three-degree-of-freedom adjustable tool is realized, and the connection reliability between the product and the tool is ensured.

Description

Technical Field

[0001] This invention belongs to the field of vibration environment testing technology and relates to a universal multi-degree-of-freedom vibration testing fixture; Background Technology To ensure the success rate of launch missions, vibration testing is an essential environmental test item during the engine development phase.

[0002] An engine is assembled from a variety of components. Due to the wide variety of components and differences in processing, it is difficult to precisely standardize its external dimensions and installation posture. At the same time, in order to ensure the flow of media between components, avoid interfering with the normal operation of components, and save internal space, engine systems are often built using on-site welding of pipelines.

[0003] The above assembly method presents challenges to the design of vibration testing fixtures. First, vibration environment tests need to reproduce the actual working state of the product. Second, 3D software cannot reproduce the routing of customized pipelines on-site. In existing technologies, dedicated fixtures are generally designed for single components with small size and uniform orientation, which cannot be adapted to vibration environment tests of multiple components under customized pipelines on-site. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a universal multi-degree-of-freedom vibration test fixture. This fixture can be adapted to different specifications of test products by adjusting the thickness of the clamping shims, thus achieving universality. At the same time, the three-degree-of-freedom adjustable fixture matches the posture of the test product, ensuring the reliability of the connection between the product and the fixture.

[0005] The solution of the present invention is: A generalized multi-degree-of-freedom vibration testing fixture, including a planar motion mechanism, a vertical motion mechanism, and a clamping mechanism; The planar motion mechanism is a horizontally placed plate-like structure; the planar motion mechanism is installed on the platform of the external vibration table and is fixed to the external vibration table by bolts; the vertical motion mechanism is fixed to the upper surface of the planar motion mechanism; and the clamping mechanism is set on the vertical motion mechanism.

[0006] In the aforementioned generalized multi-degree-of-freedom vibration test fixture, the planar motion mechanism includes a first base plate, a T-nut, and bolts; The first base plate has a T-shaped groove on its upper surface for placing a T-shaped nut; the bottom surface of the vertical motion mechanism has a countersunk hole corresponding to the T-shaped groove for placing a bolt; the vertical motion mechanism is installed in the rectangular groove of the first base plate by the threaded engagement of the T-shaped nut and the bolt.

[0007] In the aforementioned generalized multi-degree-of-freedom vibration test fixture, the T-shaped grooves are arranged in a matrix; the countersunk holes are arranged in a matrix with corresponding interval sizes.

[0008] In the aforementioned generalized multi-degree-of-freedom vibration test fixture, the vertical motion mechanism includes a second base plate, four columns, four ribs, a crossbar, four long bolts, double nuts, four T-nuts, and four bolts. The second base plate is a rectangular plate structure; four columns are symmetrically arranged in pairs, and all four columns are vertically installed on the upper surface of the second base plate; a rib is installed between the side wall of each column and the second base plate; a horizontal column is installed horizontally in the middle of the four columns; the columns have through holes along their axes; each long bolt passes through the corresponding column axially, and is locked at both ends of the long bolt by double nuts, thus fixing the column to the second base plate; a T-nut is fitted onto the outer wall of each long bolt; the front side wall of the column has a long through hole; the horizontal extension rod of the T-nut extends out from the long through hole in the front side wall of the column; the horizontal column is horizontally set at the front side wall of the four columns; the bottom of the horizontal column has four through holes, allowing the horizontal extension rods of the four T-nuts to extend into the four through holes of the horizontal column; each horizontal extension rod of the T-nut is fitted with a bolt, and the horizontal extension rod of the bolt locks the horizontal column by cooperating with the nut.

[0009] In the aforementioned generalized multi-degree-of-freedom vibration test fixture, the vertical rod of the T-nut is fitted onto the outer wall of the long bolt; a locking nut is provided at each of the upper and lower ends of the vertical rod of the T-nut.

[0010] In the aforementioned generalized multi-degree-of-freedom vibration test fixture, the vertical rod of the T-nut moves up and down along the axial direction of the long bolt; after moving to the preset position, it is locked and limited by the upper and lower locking nuts.

[0011] In the aforementioned generalized multi-degree-of-freedom vibration testing fixture, the clamping mechanism includes a clamp and a locking nut; The clamp is horizontally installed on the upper surface of the crossbar; the bottom of the clamp is fixed to the crossbar by a lock nut.

[0012] In the aforementioned generalized multi-degree-of-freedom vibration test fixture, the height of the clamp is adjusted by adjusting the height of the four T-nuts, which in turn adjusts the upper limit of the horizontal column; the horizontal position of the clamp is adjusted by adjusting the position of the vertical motion mechanism on the planar motion mechanism, thus aligning the clamp with the position required for fixing the product under test.

[0013] In the aforementioned generalized multi-degree-of-freedom vibration test fixture, the corresponding clamps are replaced according to the different shapes of the positions that need to be fixed on the product under test; and a vertical motion mechanism is added according to the different number of positions that need to be fixed on the product under test.

[0014] The aforementioned generalized multi-degree-of-freedom vibration test fixture is characterized by having a shim on the clamp; by selecting the thickness of the shim on the clamp, the installation dimensions of the clamp can be finely adjusted.

[0015] The beneficial effects of this invention compared to the prior art are: (1) The planar motion mechanism proposed in this invention is designed with a T-slot structure based on the fixed-spacing countersunk holes of the mating object, which combines the adaptability of the motion table with the flexibility of planar position adjustment, and can accurately match the planar installation requirements of the product to be tested; (2) The present invention proposes a vertical motion mechanism, which strengthens the load-bearing strength of the vertical structure by welding ribs, and achieves anti-loosening design by fastening with double nuts. Combined with T-nuts to accurately position the vertical position, and in conjunction with the planar motion mechanism, it can realize multi-dimensional position adjustment and restore the true installation posture of the product under test. (3) The clamping mechanism proposed in this invention can be adapted to different specifications of test products by adjusting the thickness of the clamping pad. The clamping operation is convenient and the product is fixed and stable, ensuring the reliable position of the product during the test. Attached Figure Description

[0016] Figure 1 This is a schematic diagram showing the cooperation between the planar motion mechanism and the vertical motion mechanism of the present invention; Figure 2 This is a schematic diagram showing the cooperation between the vertical motion mechanism and the clamping mechanism of the present invention. Detailed Implementation

[0017] The present invention will be further described below with reference to the embodiments.

[0018] This invention provides a universal multi-degree-of-freedom vibration testing fixture. Firstly, it adapts to different specifications of test products by adjusting the thickness of the clamping shims, achieving fixture universality. Secondly, the three-degree-of-freedom adjustable fixture matches the posture of the test product, ensuring reliable connection between the product and the fixture. The purpose of this invention is to reproduce the working state of the test product and obtain real and valuable test data.

[0019] General-purpose multi-degree-of-freedom vibration testing fixtures, such as Figure 1 As shown, it specifically includes a planar motion mechanism, a vertical motion mechanism, and a clamping mechanism. The planar motion mechanism is a horizontally placed plate-like structure; it is mounted on the platform of the external vibration table and fixed to it by bolts; the vertical motion mechanism is fixed to the upper surface of the planar motion mechanism; and the clamping mechanism is mounted on the vertical motion mechanism.

[0020] The planar motion mechanism includes a first base plate 1, T-nuts 3, and bolts 4. The upper surface of the first base plate 1 has T-shaped grooves for holding the T-nuts 3; the bottom surface of the vertical motion mechanism has countersunk holes corresponding to the T-shaped grooves for holding the bolts 4. The vertical motion mechanism is mounted in the rectangular grooves of the first base plate 1 through the threaded engagement of the T-nuts 3 and bolts 4. The T-shaped grooves are arranged in a matrix; the countersunk holes are arranged in a matrix with corresponding intervals.

[0021] like Figure 2 As shown, the vertical motion mechanism includes a second base plate 2, four columns 5, four ribs 6, a horizontal column 7, four long bolts 8, double nuts 9, four T-nuts 10, and four bolts 11. The second base plate 2 is a rectangular plate structure; the four columns 5 are symmetrically arranged in pairs, and all four columns 5 are vertically installed on the upper surface of the second base plate 2; a rib 6 is installed between the side wall of each column 5 and the second base plate 2; the horizontal column 7 is horizontally installed at the middle position of the four columns 5; each column 5 has a through hole along its axis; each long bolt 8 passes axially through the corresponding column 5, and the double nuts 9 lock the axial ends of the long bolt 8, thus fixing the column 5 to the second base plate 2; the outer wall of each long bolt 8 is fitted with a corresponding sleeve. Install one T-nut 10; the front side wall of the column 5 is provided with a long through hole; the horizontal extension rod of the T-nut 10 extends out from the long through hole of the front side wall of the column 5; the horizontal column 7 is horizontally set at the front side wall of the four columns 5; the bottom of the horizontal column 7 is provided with four through holes, so that the horizontal extension rods of the four T-nuts 10 can extend into the four through holes of the horizontal column 7; each horizontal extension rod of the T-nut 10 is equipped with one bolt 11, and the horizontal extension rod of the bolt 11 locks the horizontal column 7 by cooperating with the nut.

[0022] The vertical rod of the T-nut 10 is fitted onto the outer wall of the long bolt 8; a locking nut is provided at each of the upper and lower ends of the vertical rod of the T-nut 10. The vertical rod of the T-nut 10 can move up and down along the axial direction of the long bolt 8; after moving to the preset position, it is locked and limited by the two locking nuts.

[0023] The clamping mechanism includes a clamp 12 and a locking nut. The clamp 12 is horizontally mounted on the upper surface of the cross column 7; the bottom of the clamp 12 is fixedly connected to the cross column 7 by the locking nut.

[0024] By adjusting the height of the four T-nuts 10, the upper limit of the horizontal column 7 is adjusted, thereby adjusting the height position of the clamp 12; by adjusting the position of the vertical motion mechanism on the planar motion mechanism, the horizontal position of the clamp 12 is adjusted, thereby aligning the clamp 12 with the position to be fixed on the product to be tested.

[0025] Depending on the shape of the product to be tested and the position to be fixed, replace the corresponding clamp 12; depending on the number of positions to be fixed for the product to be tested, add a vertical motion mechanism.

[0026] The clamp 12 of the present invention is provided with a gasket; by selecting the thickness of the gasket on the clamp 12, the installation size of the clamp 12 can be finely adjusted.

[0027] The planar motion mechanism proposed in this invention features a T-slot structure design based on the fixed-spacing countersunk holes as the mating object. This design combines the adaptability of the motion platform with the flexibility of planar position adjustment, and can accurately match the planar installation requirements of the product under test.

[0028] This invention proposes a vertical motion mechanism that uses welded ribs to enhance the load-bearing strength of the vertical structure, double nuts for fastening to prevent loosening, and T-nuts for precise vertical positioning. In conjunction with the planar motion mechanism, it can achieve multi-dimensional position adjustment and restore the true installation posture of the product under test.

[0029] The clamping mechanism proposed in this invention can adapt to different specifications of test products by adjusting the thickness of the clamping pads. The clamping operation is convenient and the product is fixed stably, ensuring the reliable position of the product during the test.

[0030] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A universal multi-degree-of-freedom vibration testing fixture, characterized in that: This includes planar motion mechanisms, vertical motion mechanisms, and clamping mechanisms; The planar motion mechanism is a horizontally placed plate-like structure; the planar motion mechanism is installed on the platform of the external vibration table and is fixed to the external vibration table by bolts; the vertical motion mechanism is fixed to the upper surface of the planar motion mechanism; and the clamping mechanism is set on the vertical motion mechanism.

2. The universal multi-degree-of-freedom vibration testing fixture according to claim 1, characterized in that: The planar motion mechanism includes a first base plate (1), a T-nut (3), and a bolt (4); The upper surface of the first base plate (1) is provided with a T-shaped groove for placing a T-shaped nut (3); the bottom surface of the vertical motion mechanism is provided with a countersunk hole corresponding to the T-shaped groove for placing a bolt (4); the vertical motion mechanism is installed in the rectangular groove of the first base plate (1) by the threaded engagement of the T-shaped nut (3) and the bolt (4).

3. The universal multi-degree-of-freedom vibration testing fixture according to claim 2, characterized in that: The T-shaped grooves are arranged in a matrix; the countersunk holes are arranged in a matrix with corresponding intervals.

4. The universal multi-degree-of-freedom vibration testing fixture according to claim 2, characterized in that: The vertical motion mechanism includes a second base plate (2), four columns (5), four ribs (6), a horizontal column (7), four long bolts (8), double nuts (9), four T-nuts (10), and four bolts (11). The second base plate (2) is a rectangular plate structure; four columns (5) are symmetrically arranged in pairs, and all four columns (5) are vertically installed on the upper surface of the second base plate (2); a rib plate (6) is installed between the side wall of each column (5) and the second base plate (2); a horizontal column (7) is installed horizontally in the middle of the four columns (5); the columns (5) have through holes along the axis; each long bolt (8) passes through the corresponding column (5) along the axis, and the axial ends of the long bolt (8) are locked by double nuts (9), and the column (5) is fixedly connected to the second base plate (2); the outer side of each long bolt (8) One T-nut (10) is fitted on the wall; a long through hole is provided on the front side wall of the column (5); the horizontal extension rod of the T-nut (10) extends out from the long through hole on the front side wall of the column (5); the horizontal column (7) is horizontally set on the front side wall of the four columns (5); the bottom of the horizontal column (7) is provided with four through holes, so that the horizontal extension rods of the four T-nuts (10) can be inserted into the four through holes of the horizontal column (7); each T-nut (10) has a corresponding bolt (11) installed on its horizontal extension rod, and the horizontal extension rod of the bolt (11) locks the horizontal column (7) by cooperating with the nut.

5. The universal multi-degree-of-freedom vibration testing fixture according to claim 4, characterized in that: The vertical rod of the T-nut (10) is fitted onto the outer wall of the long bolt (8); a locking nut is provided at each of the upper and lower ends of the vertical rod of the T-nut (10).

6. The universal multi-degree-of-freedom vibration testing fixture according to claim 5, characterized in that: The vertical rod of the T-nut (10) moves up and down along the axial direction of the long bolt (8); after moving to the preset position, it is locked and limited by the upper and lower locking nuts.

7. The universal multi-degree-of-freedom vibration testing fixture according to claim 6, characterized in that: The clamping mechanism includes a clamp (12) and a locking nut; The clamp (12) is horizontally installed on the upper surface of the cross column (7); the bottom of the clamp (12) is fixed to the cross column (7) by a locking nut.

8. The universal multi-degree-of-freedom vibration testing fixture according to claim 7, characterized in that: By adjusting the height of the four T-nuts (10), the upper limit of the horizontal column (7) is adjusted, thereby adjusting the height position of the clamp (12); by adjusting the position of the vertical motion mechanism on the planar motion mechanism, the horizontal position of the clamp (12) is adjusted, thereby aligning the clamp (12) with the position to be fixed on the product to be tested.

9. The universal multi-degree-of-freedom vibration testing fixture according to claim 8, characterized in that: Depending on the shape of the product to be tested and the position to be fixed, replace the corresponding clamp (12); depending on the number of positions to be fixed for the product to be tested, add a vertical motion mechanism.

10. The universal multi-degree-of-freedom vibration testing fixture according to claim 8, characterized in that: A gasket is provided on the clamp (12); by selecting the thickness of the gasket on the clamp (12), the installation size of the clamp (12) can be finely adjusted.

Images