Vibration Generator

Abstract

To provide a vibration generator capable of changing a vibration direction with a simple configuration.SOLUTION: A vibration generator includes: a vibration table; a first base plate; a second base plate; and a third base plate. The second base plate includes: a first fluid supply part for forming a first fluid film between a sliding surface and a third surface by jetting out fluid to a sliding surface; and a second fluid supply part for forming a second fluid film between a first surface and a fourth surface by jetting out fluid to the first surface. The third plate has a third fluid supply part for forming a third fluid film between a fifth surface and a second surface by jetting out fluid to the second surface.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a vibration generating device. [Background technology]

[0002] Conventionally, vibration generators that vibrate a specimen, which is the object to be tested in a vibration test, are known. For example, vibration generators using fluid bearings and multi-directional vibration generators that can change the direction of vibration have been proposed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5766844 [Patent Document 2] Japanese Patent Application Laid-Open No. 1987-14034 [Patent Document 3] Japanese Patent Application Laid-Open No. 1985-10142 Summary of the Invention [Problem to be solved by the invention]

[0004] The conventional vibration generator described above can perform multi-directional vibration tests without changing the test specimen, but the structure for switching the vibration direction is complex, making it difficult to handle and one of the causes of increased costs.

[0005] The present invention has been made in consideration of the above, and if a vibration generating device can be provided that can change the vibration direction with a simple configuration, it will be possible to easily carry out more efficient vibration tests, and it will be possible to reduce testing costs and device manufacturing costs, which is significant. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the vibration generator according to the present invention includes a vibration table, a first base plate, a second base plate, and a third base plate. The vibration table is a plate-like member that is detachable from a vibration generating unit that generates vibrations in a first direction and that can fix a test specimen to a mounting surface. The first base plate is a plate-like member that has a protrusion on a first surface that is fixed to a substantially flat sliding surface opposite the mounting surface of the vibration table, is slidable in the first direction, and is rotatable around the protrusion. The second base plate is a flat plate-like member that has a third surface facing the sliding surface, a fourth surface facing the first surface, and an opening that penetrates between the third surface and the fourth surface and through which the protrusion is inserted. The third base plate has a fifth surface facing the second surface opposite the first surface, and slidably supports the first base plate in cooperation with the second base plate. The second base plate has a first fluid supply section that injects fluid onto the sliding surface and forms a first fluid film between the sliding surface and the third surface, and a second fluid supply section that injects fluid onto the first surface and forms a second fluid film between the first surface and the fourth surface, and the third base plate has a third fluid supply section that injects fluid onto the second surface and forms a third fluid film between the fifth surface and the second surface. [Effects of the Invention]

[0007] The vibration generator according to the present invention has a simple configuration and can perform vibration tests in various directions with simple work without changing the specimen, thereby enabling efficient vibration tests to be performed at low cost. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an exemplary schematic side view of a vibration generator according to an embodiment. [Figure 2] FIG. 2 is an exemplary schematic plan view of the vibration table (slip table) of the vibration generator according to the embodiment. [Figure 3]FIG. 3 is an exemplary schematic exploded perspective view of a first base plate, a second base plate, and a third base plate that are installed below the vibration table of the vibration generator according to the embodiment. [Figure 4] FIG. 4 is an exemplary schematic perspective cross-sectional view of the vibration table, the first base plate, the second base plate, and the third base plate of the vibration generator according to the embodiment. [Figure 5] FIG. 5 is a schematic plan view illustrating an example of the second base plate of the electromagnetic exciter according to the embodiment. [Figure 6] FIG. 6 is a schematic cross-sectional view illustrating an example of a combination of the first base plate, the second base plate, and the third base plate of the electromagnetic exciter according to the embodiment. [Figure 7] FIG. 7 is an exemplary schematic cross-sectional view showing flow paths formed in the second base plate and the third base plate of the exciter according to the embodiment. [Figure 8] FIG. 8 is an exemplary schematic plan view showing a state in which a protruding portion of a first base plate is exposed from an opening portion of a second base plate of a vibration generator according to an embodiment. [Figure 9] FIG. 9 is an exemplary schematic perspective view showing a connecting block connectable to the vibration table of the vibration generator according to the embodiment. [Figure 10] FIG. 10 is an exemplary schematic perspective view showing a fluid circulation system in the vibration testing device of the embodiment. [Figure 11] FIG. 11 is an exemplary schematic explanatory diagram showing the manner of connection switching of the vibration table of the vibration testing device according to the embodiment. [Figure 12] FIG. 12 is an exemplary schematic plan view showing fluid distribution grooves that contribute to the formation of an oil film formed on the third surface of the second base plate of the vibration testing device according to the embodiment. [Figure 13] FIG. 13 is an exemplary schematic plan view showing another fluid distribution groove that contributes to the formation of an oil film formed on the third surface of the second base plate of the vibration testing device according to the embodiment. [Figure 14]FIG. 14 is a schematic plan view illustrating an exemplary configuration of the vibration testing device according to the embodiment, which provides a click feeling at the position where the fixing block faces the connecting block, making it easy to feel a temporary stop. [Figure 15] FIG. 15 is an exemplary schematic exploded perspective view showing a configuration in which a click feeling is felt when the fixing block faces the connecting block in the vibration testing device of the embodiment, making it easy to feel a temporary stop. [Figure 16] FIG. 16 is a schematic side view showing an example of another configuration of the vibration testing device according to the embodiment, which makes it easy to feel a click and a temporary stop when the fixing block faces the connecting block. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of a vibration generator according to the present disclosure will be described in detail with reference to the drawings. Note that the present invention is not limited to these embodiments. The following embodiments also include those that are interchangeable with and easily conceivable by those skilled in the art, or those that are substantially the same.

[0010] First, the overall configuration of the electromagnetic exciter 10 according to the embodiment will be described. Fig. 1 is an exemplary schematic side view of the electromagnetic exciter 10 according to the embodiment.

[0011] The vibration generator 10 according to this embodiment is a device that performs vibration testing by forcibly vibrating a test piece (e.g., a sample submitted by a manufacturer when requesting a quality inspection). The vibration generator 10 performs testing by, for example, applying vibrations parallel to a surface plate (horizontal direction) to a slip table 12 (vibration table) on which the test piece is placed and fixed, or by applying vibrations perpendicular to the surface plate. FIG. 1 shows the vibration generator 10 set up so that it can apply vibrations parallel to the surface plate. The operating state of the vibration generator 10 can be changed by rotating the yoke 16, which constitutes the vibration generating unit 14, by, for example, 90° clockwise.

[0012] As shown in Fig. 1, the vibration generator 10 mainly comprises a yoke 16 constituting the vibration generating unit 14, a vibration table 18, a base 20 supporting the vibration generating unit 14, a connecting block 22 connecting the slip table 12 and the vibration table 18, and a fluid recycling unit 24 for fluid provided below the slip table 12. Note that the fluid used in this embodiment is an incompressible fluid, such as oil. The fluid (oil) is used during the vibration and rotation of the slip table 12, which will be described later.

[0013] The material of the yoke 16 may be, for example, a magnetic material with high magnetic permeability and high strength, such as low-carbon steel such as SS400. The material of the vibration table 18 may be, for example, a non-magnetic, high-strength metal such as an aluminum alloy, or a synthetic resin such as carbon fiber. The arrow X direction in FIG. 1 indicates the vibration direction (first direction) of the vibration generating unit 14 in the horizontal vibration mode.

[0014] The yoke 16 is provided with an excitation coil (not shown) that generates a static magnetic field in the yoke 16 and a drive coil for generating vibrations. The drive coil is disposed within the magnetic gap and is integrally configured with the vibration table 18. By passing a DC current through the excitation coil, a magnetic circuit (static magnetic field) is generated within the yoke 16 surrounding the excitation coil. Then, by passing an AC current of a predetermined frequency through the drive coil, a force is exerted between the static magnetic field generated in the magnetic gap and the AC current flowing through the drive coil. This force causes the drive coil to vibrate in a direction perpendicular to the direction of the magnetic flux. As a result, the vibration table 18 vibrates at the frequency of the AC current passed through the drive coil, and accordingly, a test specimen attached to the slip table 12 as a vibrated object vibrates in the direction of arrow X, thereby conducting a vibration test.

[0015] FIG. 2 is an exemplary schematic plan view of the slip table 12 of the vibration generator 10. The slip table 12 is a plate-like member that is detachable from the vibration generator 14, which generates vibration in the direction of arrow X (first direction) in FIG. 1, and that can fix a specimen to be subjected to a vibration test on a mounting surface 12a. The mounting surface 12a has, for example, a matrix of multiple screw holes 12b for fixing the specimen. The screw holes 12b can be used to fix the specimen directly, or the specimen can be fixed via a jig or the like. The method for fixing the specimen on the slip table 12 is an example, and may also be achieved by, for example, air suction, electromagnetic force, or other means of adsorption.

[0016] The slip table 12 includes a plurality of fixed blocks 26 on its outer edge that can be attached to and detached from connecting blocks 22 integrated with the vibration generating unit 14. Details of the connecting blocks 22 will be described later. In the example shown in FIG. 2, the slip table 12 has a mounting surface 12a that is approximately square, and the fixed blocks 26 are provided at approximately the center of each of the four outer edges. Therefore, by rotating the slip table 12 and changing the connection positions of the fixed blocks 26 relative to the connecting blocks 22, the vibration test direction can be changed in 90° increments while maintaining the fixed state of the EUT placed and fixed on the mounting surface 12a (i.e., the EUT remains fixed without being reattached to the mounting surface 12a), even if the vibration direction of the vibration generating unit 14 is limited to the direction of arrow X. The shape of the slip table 12 is not limited to an approximately square, and it may be a polygon with five or more sides or a circle. If the slip table 12 is polygonal, the vibration direction can be selected according to the number of strokes. Furthermore, when the slip table 12 is circular, any number of fixed blocks 26 can be formed along the outer periphery of the slip table 12, and vibration directions according to the number of fixed blocks 26 can be realized.

[0017] Fig. 3 is an exemplary schematic exploded perspective view of the first base plate 28, second base plate 30, and third base plate 32 for achieving the vibration and rotational motion of the slip table 12 of the vibration generator 10. Fig. 4 is an exemplary schematic cross-sectional perspective view of the slip table 12, first base plate 28, second base plate 30, and third base plate 32 of the vibration generator 10. Fig. 5 is an exemplary schematic plan view of the second base plate 30 of the vibration generator 10, and Fig. 6 is an exemplary schematic cross-sectional view of the first base plate 28, second base plate 30, and third base plate 32 combined together.

[0018] 3, the first base plate 28 is, for example, a substantially disk-shaped member, and is provided with a cylindrical protrusion 34 in the approximate center of a first surface 28a, which is one flat surface of the first base plate 28. Furthermore, as shown in FIGS. 3 and 4, the second base plate 30 is a flat plate-shaped component interposed between the slip table 12 and the first base plate 28. The second base plate 30 is provided with a third surface 30a facing the approximately flat sliding surface 12c on the opposite side of the mounting surface 12a of the slip table 12, a fourth surface 30b facing the first surface 28a of the first base plate 28, and a substantially circular opening 36 that penetrates between the third surface 30a and the fourth surface 30b and through which the protrusion 34 of the first base plate 28 is inserted. The third base plate 32 is a plate-like component having a fifth surface 32a that faces the second surface 28b of the first base plate 28, which is opposite the first surface 28a. The third base plate 32 cooperates with the second base plate 30 to slidably support the first base plate 28 between the third base plate 32 and the second base plate 30. Between the second base plate 30 and the third base plate 32, a fourth base plate 38, which is formed slightly thicker than the thickness of the first base plate 28 defined by the first surface 28a and the second surface 28b and has a generally pentagonal shape in plan view, is disposed, for example, at one of the four corners. The fourth base plate 38 functions as a spacer that ensures a predetermined gap (the thickness of the first base plate 28 plus a gap for oil film formation, described later) between the second base plate 30 and the third base plate 32. The shape of the fourth base plate 38 is merely an example, and in this embodiment, it is generally pentagonal to avoid interference with the disk-shaped first base plate 28. However, any other spacer shape that can avoid interference with the first base plate 28 may be used. For example, it may be cylindrical, rectangular, or triangular in plan view. The fourth base plate 38 may also be formed as a protrusion integrated into the fourth surface 30b of the second base plate 30 or the fifth surface 32a of the third base plate 32, and will function in the same way.

[0019] When the first base plate 28 is sandwiched between the second base plate 30 and the third base plate 32, with a predetermined gap formed by the fourth base plate 38, the protrusion 34 integrally formed on the first base plate 28 penetrates the opening 36 of the second base plate 30, and the upper surface 34a of the protrusion 34 protrudes slightly from the third surface 30a, as shown in FIG. 6 . The upper surface 34a of the protrusion 34 is fixed to the substantially flat sliding surface 12c of the slip table 12. In other words, the first base plate 28 is integrated with the slip table 12 via the second base plate 30. As a result, the first base plate 28 can vibrate and pivot in the direction of arrow X between the second base plate 30 and the third base plate 32 in response to the behavior of the slip table 12 (vibration and pivoting in the direction of arrow X in FIG. 1 ).

[0020] The slip table 12 of this embodiment is configured to be able to perform vibration and rotation operations smoothly and stably by means of a fluid bearing that uses a fluid (e.g., oil). Fig. 7 is an exemplary schematic cross-sectional view showing a first flow path 40 as a flow path for a fluid (oil) formed in the second base plate 30 of the vibration generator 10, and a second flow path 42 as a flow path for a fluid (oil) formed in the third base plate 32.

[0021] The first flow path 40 formed in the second base plate 30 injects a fluid, such as oil, from the first fluid supply section 40a onto the sliding surface 12c of the slip table 12, forming a first fluid film 44a between the sliding surface 12c and the third surface 30a of the second base plate 30.

[0022] 8 is an exemplary schematic plan view showing a state in which the protrusion 34 (top surface 34a) of the first base plate 28 is exposed through the opening 36 of the second base plate 30 of the vibration generator 10. The diameter R of the substantially circular opening 36 is larger than the diameter r of the cylindrical protrusion 34 that passes through the opening 36 by a gap S that is equivalent to or greater than the vibration stroke (e.g., 50 mm to 60 mm) in the direction of arrow X of the vibration table 18 (see FIG. 1). Therefore, when vibration is applied by the vibration table 18, the inner wall surface 36a of the opening 36 and the outer peripheral surface 34b of the protrusion 34 can be kept out of contact with each other.

[0023] Moreover, for example, four first fluid supply units 40a are arranged at equal intervals around the opening 36. By jetting fluid from each first fluid supply unit 40a, a wide-area first fluid film 44a is formed between the sliding surface 12c of the slip table 12 and the third surface 30a of the second base plate 30, functioning as a fluid bearing for the slip table 12. As a result, the slip table 12 can achieve smooth and stable sliding (vibration) and rotational motion relative to the second base plate 30.

[0024] 7, the first flow path 40 injects a fluid, such as oil, from a second fluid supply unit 40b onto the first surface 28a of the first base plate 28, forming a second fluid film 44b between the fourth surface 30b and the first surface 28a. Similarly, the second flow path 42 injects a fluid, such as oil, from a third fluid supply unit 42a onto the second surface 28b of the first base plate 28, forming a third fluid film 44c between the fifth surface 32a of the third base plate 32 and the second surface 28b of the first base plate 28.

[0025] A plurality of second fluid supply units 40b and third fluid supply units 42a are arranged, for example, at equal intervals, within a range in which the first base plate 28 can move when sliding (when vibrating in the direction of arrow X in FIG. 1). As shown in FIG. 5, the second fluid supply units 40b are provided, for example, in pairs at four locations, for a total of eight locations. As shown in FIGS. 3 and 4, a plurality of third fluid supply units 42a are also arranged, for example, at equal intervals, within a range in which the first base plate 28 can move when sliding (when vibrating in the X direction). The third fluid supply units 42a are provided, for example, in pairs at four locations, for a total of eight locations. Note that in the cross-sectional view of FIG. 4, only four third fluid supply units 42a are shown.

[0026] The second fluid supply unit 40b and the third fluid supply unit 42a are arranged in the same configuration at corresponding positions on the first surface 28a and the second surface 28b of the first base plate 28, forming a pocket 46 that temporarily stores the injected fluid (oil) centered around the second fluid supply unit 40b and the third fluid supply unit 42a. The configuration of the pocket 46, including the third fluid supply unit 42a, will be described using FIG. 4. As shown in FIG. 4, a land 46a of uniform height is formed around the third fluid supply unit 42a, forming the pocket 46 surrounding the third fluid supply unit 42a. The pocket 46 can store a certain amount of fluid. The height of the land 46a (the height of the pocket 46) can be determined depending on the thickness of the third fluid film 44c to be formed. The height of the land 46a can be, for example, approximately 2 to 6 mm. Therefore, the thickness of the third fluid film 44c is determined by the height of the land 46a plus the amount of fluid desired to push up the first base plate 28 when it overflows. Similarly, a pocket 46 surrounded by a land 46a is formed around the second fluid supply portion 40b, forming a second fluid film 44b of a predetermined thickness. The height of the land 46a (height of the pocket 46) relative to the second fluid supply portion 40b can be determined according to the thickness of the second fluid film 44b to be formed. Therefore, the thickness of the second fluid film 44b is determined by the height of the land 46a plus the amount by which the fluid is desired to press down on the first base plate 28 when it overflows.

[0027] In this way, in the vibration generator 10, a first fluid film 44a is formed between the third surface 30a of the second base plate 30 and the sliding surface 12c of the slip table 12, a second fluid film 44b is formed between the fourth surface 30b of the second base plate 30 and the first surface 28a of the first base plate 28, and a third fluid film 44c is formed between the second surface 28b of the first base plate 28 and the fifth surface 32a of the third base plate 32. As a result, contact between the slip table 12 and the second base plate 30 and contact between the first base plate 28 connected to the slip table 12 and the second base plate 30 and the third base plate 32 is avoided, and the combination of the slip table 12 and the first base plate 28 can be supported by a fluid bearing relative to the combination of the second base plate 30 and the third base plate 32. As a result, when the slip table 12 is connected to the vibration table 18 (vibration generating unit 14) via the connecting block 22, the slip table 12 can smoothly reciprocate (slide) in the direction of arrow X in FIG. 1 . Furthermore, when the connection between the slip table 12 and the connecting block 22 is released, the slip table 12 can be freely and smoothly rotated. In this case, since the slip table 12 is connected to the first base plate 28 via the protrusion 34, the rotation position of the slip table 12 is restricted by the opening 36 of the second base plate 30, and the slip table 12 (first base plate 28) will not fall off from the combined assembly of the second base plate 30 and the third base plate 32. After rotating the slip table 12, by connecting one of the multiple fixing blocks 26 formed on the outer edge of the slip table 12 to the connecting block 22, it is possible to perform a vibration test on the test specimen in another direction while keeping the test specimen fixed to the slip table 12 with respect to the vibration direction of the vibration table 18.

[0028] As shown in FIG. 7, the first flow path 40 and the second flow path 42 are connected by a connecting pipe 48, allowing a common fluid (oil) to be used in the first flow path 40 and the second flow path 42. As shown in FIG. 5, the first flow path 40 formed in the second base plate 30 is formed, for example, in a lattice pattern. For processing purposes, each of the flow paths constituting the first flow path 40 and the second flow path 42 has a start end and a terminal end formed at the outer edge of the second base plate 30 and the third base plate 32, respectively. One of the start end and terminal end serves as a fluid supply port, and the others are sealed, for example, by a stop plug 50. The circulation of fluid using the first flow path 40 and the second flow path 42 will be described later.

[0029] FIG. 9 is an exemplary schematic perspective view showing a connecting block 22 that can be connected to a fixed block 26 formed on the outer edge of the slip table 12 of the vibration generator 10.

[0030] The connecting block 22 is a plate-like component that is roughly T-shaped in plan view, and has a plurality (e.g., four) of diagonally extending countersunk holes 54 formed on the upper surface 22a side through which fastening members 52 (e.g., bolts) for connecting and fixing to the vibration table 18 extend from the upper surface 22a to the side surface 22b. A guide member 56 is fixed to the lower surface 22c, which is the surface opposite the upper surface 22a, for smoothly and stably guiding the connecting block 22 in the vibration direction of the vibration table 18 (the direction of arrow X in FIG. 1 ) without generating vibrations other than those in the direction of arrow X (e.g., vibrations in a perpendicular direction). Two guide members 56, for example, are fixed parallel to the direction of arrow X. A well-known linear guide, for example, can be used as the guide member 56.

[0031] Furthermore, in the connecting block 22, a side surface 22d opposite to the side surface 22b is provided with a plurality of screw holes 58 into which fastening members (for example, bolts) are threadedly engaged for connecting and fixing the fixed block 26 of the slip table 12 and the connecting block 22 shown in Fig. 4. As shown in Fig. 4, in order to advance the fastening members from the mounting surface 12a of the slip table 12 to the side surface 22d of the connecting block 22, a plurality of (for example, four) diagonally extending countersunk holes 26a communicating with the insertion holes 26b are formed in the mounting surface 12a.

[0032] In this way, the connection and fixation between the fixed block 26 formed on the slip table 12 and the connecting block 22 can be achieved by accessing from the mounting surface 12a side of the slip table 12, so that the slip table 12 can be rotated to change the vibration direction of the test piece easily and efficiently.

[0033] 10 is an exemplary schematic perspective view showing a fluid (oil) circulation system in the vibration generator 10. As described above, the vibration generator 10 circulates fluid within the fluid system both when the slip table 12 is vibrating (during a vibration test) and when the slip table 12 is rotating to change the vibration direction of the specimen while the specimen is fixed to the mounting surface 12a of the slip table 12. That is, when the vibration generator 10 is performing a vibration test or when switching between rotations, fluid is constantly ejected from the first fluid supply unit 40a, the second fluid supply unit 40b, and the third fluid supply unit 42a, forming a first fluid film 44a, a second fluid film 44b, and a third fluid film 44c.

[0034] The fluid recycle unit 24 shown in FIG. 10 accommodates a storage tank, a suction filter, a pump, a relief valve, a switching valve, and the like. The storage tank stores oil as a fluid circulating in the circulation system. The suction filter purifies the circulating fluid (oil) by removing foreign matter. The pump delivers the fluid (oil) in a compressed state from the storage tank through the relief valve, switching valve, and the like, and ejects it from the first fluid supply unit 40a, etc. The fluid discharge pressure at this time is, for example, 3 MPa to 7 MPa, etc. The ejected fluid is supplied to the third base plate 32, for example, from the fluid inlet 32b of the third base plate 32, via the supply pipe 60. As the supplied fluid flows through the second flow path 42, it is ejected from the third fluid supply unit 42a and forms a third fluid film 44c. When the fluid reaches the terminal end of the second flow path 42, it flows into the first flow path 40 via the connecting pipe 48. As the fluid flows through the first flow path 40, it is ejected from the first fluid supply portion 40a and the second fluid supply portion 40b, forming a first fluid film 44a and a second fluid film 44b. The fluid W, which has finished functioning as the first fluid film 44a and flowed out from the third surface 30a of the second base plate 30, is collected by the drain pan 62 installed below the third base plate 32. Similarly, the fluid W, which has finished functioning as the second fluid film 44b and flowed out from the end of the first base plate 28, flows down onto the fifth surface 32a of the third base plate 32. The fluid W, which has finished functioning as the third fluid film 44c and flowed out from the end of the first base plate 28, is collected by the drain pan 62 together with the fluid W that had been functioning as the second fluid film 44b. The fluid W collected in the drain pan 62 is sucked by the negative pressure generated by the pump of the fluid recycling section 24, and returned to the storage tank of the fluid recycling section 24 via the return path 64. After being filtered by a suction filter, the fluid W is reused again to form an oil film.

[0035] 11 is an exemplary schematic explanatory diagram showing a switching mode CS of the connection state of the slip table 12 of the vibration generator 10. In the case of FIG. 11, a specimen 66 having a substantially rectangular parallelepiped shape is fixed to the mounting surface 12a of the slip table 12. The specimen 66 is fixed so that one of its short sides 66a is parallel to the arrangement direction of the pair of guide members 56 connected to the connecting block 22.

[0036] 11 shows a state in which a connecting block 22 connected to the vibration table 18 and guided by a guide member 56 is connected to a first fixed block 26M among the fixed blocks 26 provided on the outer edge of the slip table 12. The first fixed block 26M and the connecting block 22 are connected by fastening members. Therefore, when the vibration table 18 vibrates in the direction of arrow X in FIG. 1, the specimen 66 is vibrated along a longitudinal side 66b perpendicular to a lateral side 66a, thereby performing a vibration test. In this case, since the connecting block 22 is guided by the guide member 56 and the slip table 12 is supported by fluid bearings such as the first fluid film 44a, the specimen 66 is stably vibrated parallel to the installation surface (e.g., a surface plate) of the guide member 56, and a highly accurate vibration test is performed.

[0037] 11 shows a state in which the vibration test on the specimen 66 has been completed and the connecting block 22 has been separated from the first fixed block 26M of the slip table 12 in order to perform a vibration test on the specimen 66 in another direction. The first fixed block 26M and the connecting block 22 can be separated by removing the fastening member from the insertion hole 26b, as described with reference to FIGS. 4 and 9.

[0038] Next, as shown in mode CS3 of Fig. 11, the slip table 12 is rotated, for example, counterclockwise, with the specimen 66 fixed to the mounting surface 12a. In this case, the diameter R of the opening 36 of the second base plate 30 is larger than the diameter r of the protrusion 34 of the first base plate 28 by the gap S, so that the slip table 12 together with the first base plate 28 can be easily slid manually in a direction away from the connecting block 22. Therefore, the slip table 12 (fixed block 26) can be rotated without interfering with the connecting block 22. Furthermore, as described above, the first fluid film 44a, the second fluid film 44b, and the third fluid film 44c are formed even during the rotating operation, so that the slip table 12 can be rotated smoothly, stably, and easily.

[0039] In mode CS4, the slip table 12 is rotated counterclockwise by 90°, resulting in the second fixed block 26N adjacent to the first fixed block 26M formed on the connecting block 22 facing each other. In this case, if the fixed block 26 is configured to stop with a click at the position where it faces the connecting block 22, the slip table 12 can be rotated easily and accurately.

[0040] Mode CS5 shows a state in which the second fixed block 26N, which has been moved to a position facing the connecting block 22, is connected to the connecting block 22. In this case, the slip table 12 needs to be brought close to the connecting block 22. However, because the first fluid film 44a and the like remain formed, the second fixed block 26N of the slip table 12 can be brought close to the connecting block 22 easily and smoothly. In this state, fastening members are inserted into the insertion holes 26b of the second fixed block 26N and screwed into them, thereby completing the fastening of the slip table 12 (second fixed block 26N) to the connecting block 22. In this case, the specimen 66 is fixed so that one of its longitudinal sides 66b is parallel to the arrangement direction of the pair of guide members 56 connected to the connecting block 22. Therefore, when the vibration table 18 vibrates in the direction of the arrow X in FIG. 1, the specimen 66 is vibrated along its lateral side 66a, which is perpendicular to the longitudinal side 66b, and a vibration test is performed. In other words, the vibration test direction for the specimen 66 can be changed without removing the specimen 66 from the slip table 12, and a highly accurate vibration test can be carried out easily and efficiently.

[0041] During the vibration test, force moments are generated in various directions on the slip table 12. In the vibration generator 10, the slip table 12 and the first base plate 28 are integrally connected, so the force moments generated on the slip table 12 are transmitted to the first base plate 28. The pockets 46 formed around the first fluid supply unit 40a, the second fluid supply unit 40b, and the third fluid supply unit 42a can be positioned on the fourth surface 30b of the second base plate 30 and the fifth surface 32a of the third base plate 32, facing each other in the vertical direction across the first base plate 28. As a result, a strong counterforce can be generated on the first base plate 28. The magnitude of this counterforce can be adjusted to the desired magnitude by changing the pressure of the supplied fluid (oil). Therefore, by adjusting the fluid pressure, it is possible to effectively suppress vibrations in directions other than the vibration direction of the specimen 66 (slip table 12), further improving the accuracy of the vibration test. Furthermore, the pocket 46 (second fluid supply section 40b, third fluid supply section 42a) can efficiently generate a counter force by being positioned within the range of the plane projection surface of the first base plate 28 even when the slip table 12 (first base plate 28) is sliding or rotating.

[0042] In the above-described embodiment, the first fluid supply unit 40a has an open end on the flat third surface 30a in order to form a thin and wide first fluid film 44a over the entire third surface 30a of the second base plate 30. In other embodiments, a groove for distributing the fluid may be formed around the periphery of the first fluid supply unit 40a.

[0043] FIG. 12 is an exemplary schematic plan view showing fluid distribution grooves 68 that contribute to the formation of the first fluid film 44a formed on the third surface 30a of the second base plate 30 of the vibration generator 10.

[0044] On the surface of the third surface 30a, fluid distribution grooves 68 are formed starting from the first fluid supply units 40a to distribute the fluid over a wide area of ​​the third surface 30a, forming a wide first fluid film 44a between the sliding surface 12c of the slip table 12 and the third surface 30a of the second base plate 30. In the case of FIG. 12, the first fluid supply units 40a and the fluid distribution grooves 68 are connected within the plane of the third surface 30a, and the fluid flows smoothly along the fluid distribution grooves 68, allowing the fluid to be stably supplied over a wide area of ​​the third surface 30a. As a result, a stable, approximately uniform pressure area is formed by the fluid, surrounded by the fluid distribution grooves 68 connected to each first fluid supply unit 40a. The fluid (first fluid film 44a) spreading over a wide range attenuates minute vibrations (crosstalk components) other than the normal vibration direction (X direction in FIG. 1) that are generated by chatter vibrations and resonance of the specimen 66 and the slip table 12 during the vibration test of the slip table 12, enabling a highly accurate vibration test. The configuration of the fluid distribution groove 68 in FIG. 12 is an example in which the fluid distribution groove 68 starting from the first fluid supply portion 40a forms multiple approximately rectangular pressure areas around the opening 36 and uniformly supports the sliding surface 12c of the slip table 12.

[0045] FIG. 13 is an exemplary schematic plan view showing another fluid distribution groove 68a that contributes to the formation of the first fluid film 44a on the third surface 30a of the second base plate 30 of the vibration generator 10. In FIG. 13, the multiple first fluid supply units 40a and the fluid distribution groove 68a are connected within the plane of the third surface 30a to form a rectangular pressure area surrounding the opening 36. In this case, too, the fluid flows smoothly along the fluid distribution groove 68a, allowing the fluid to be stably supplied over a wide area of ​​the third surface 30a. As a result, a stable, approximately uniform pressure area is formed by the fluid. Also in this case, the fluid (first fluid film 44a) spreading over a wide area attenuates micro-vibrations (crosstalk components) in directions other than the normal vibration direction (the X direction in FIG. 1 ) that are generated by chatter vibrations or resonance of the specimen 66 or the slip table 12 during the vibration test of the slip table 12, enabling highly accurate vibration testing.

[0046] The plan view of Figure 14 and the exploded oblique view of Figure 15 are explanatory diagrams that explain the configuration in which, in mode CS4 of Figure 11, the fixed block 26 (second fixed block 26N) has a clicking sensation at the position where it faces the connecting block 22, making it easy to feel a temporary stop.

[0047] 11 , when the connection between the connecting block 22 and the fixed block 26 is released in mode CS2, the first base plate 28 is supported between the second base plate 30 and the third base plate 32 in a substantially contactless and free-rotating state by the fluid bearing formed by the second fluid film 44b and the third fluid film 44c. If the first base plate 28 had a fixed rotation axis, the fixed rotation axis could be subjected to horizontal shear stress during a vibration test, for example, when horizontal vibration is applied, which could cause the rotation axis to wear or be damaged, resulting in loss of rotation function. On the other hand, in the case of the first base plate 28 of this embodiment, which does not have a fixed rotation axis, vibration tests and the operation of switching the connection state of the slip table 12 (first base plate 28) can be performed without causing the above-mentioned inconvenience. However, since the inner diameter of the opening 36 of the second base plate 30 is larger than the diameter of the protrusion 34 of the first base plate 28, it is difficult to determine the center of rotation of the first base plate 28, and aligning the fixed block 26 and the connecting block 22 may become complicated.

[0048] 14 and 15, a rotation guide unit 70 that provides guidance from multiple directions and a resistance generator 72 that generates a clicking sensation are arranged around the outer periphery of the first base plate 28. FIG. 14 shows a state in which the slip table 12 and the second base plate 30 connected to the protrusion 34 of the first base plate 28 have been removed. In the example shown in FIG. 14, the rotation guide units 70 are arranged on three of the fourth base plates 38 that are arranged at the four corners of the third base plate 32, and a resistance generator 72 is arranged on the remaining fourth base plate 38.

[0049] A gear 74 is provided around the outer circumferential surface of the first base plate 28. The gear 74 is capable of meshing with a rotary gear 70a rotatably supported by the rotation guide portion 70. The rotary gear 70a is rotatably supported by a swing arm 70b that can swing between a first position (shown by a solid line) in which the gear 74 and the rotary gear 70a are meshed with each other and a second position (shown by a dashed line) in which the gear 74 and the rotary gear 70a are not meshed with each other with respect to the fourth base plate 38. The swing arm 70b is swingably supported by the fourth base plate 38. The swing arm 70b is biased in a clockwise direction by a biasing member (e.g., a leaf spring or a helical spring) not shown, and assumes the first position in which the gear 74 and the rotary gear 70a are meshed with each other. In addition, the fourth base plate 38 or the fourth base plate 38 is formed with a stopper (not shown) that is arranged so that the rotating gear 70a journaled on the swing arm 70b stops facing toward approximately the center position of the protrusion 34 when in the first posture.

[0050] Meanwhile, the resistance generating unit 72 has a contact 72a, which is flexible in the circumferential direction of the first base plate 28, supported by a swing arm 72b. The contact 72a is engageable with a gear 74 formed around the periphery of the first base plate 28 and a notch 74a formed in a part of the gear 74. The swing arm 72b is pivotally supported by the fourth base plate 38 so as to be swingable. Therefore, the resistance generating unit 72 can swing between a first position (shown by a solid line) in which the contact 72a contacts the gear 74 or the notch 74a, and a second position (shown by a dashed line) in which the contact 72a is not in contact with the gear 74 or the notch 74a. Like the swing arm 70b, the swing arm 72b is also biased clockwise by a biasing member (e.g., a leaf spring or a helical spring, not shown) to assume the first position in which the contact 72a contacts the gear 74 or the notch 74a. The fourth base plate 38 or the fourth base plate 38 is formed with a stopper (not shown) that stops the contact 72a supported by the swing arm 72b so that it faces approximately the center position of the protrusion 34 when the contact 72a is in the first posture. The cutouts 74a are recesses that are formed deeper than the tooth height of the gear 74, and are formed, for example, at 90° intervals around the periphery of the first base plate 28.

[0051] As shown in FIG. 14 , when the rotation guide portion 70 and the resistance generating portion 72 are in the first position, the first base plate 28 is supported from all sides and is substantially centered. Therefore, when the slip table 12 (first base plate 28) is rotated to change the facing position of the fixed block 26 and the connecting block 22, the contact 72a contacts the notch 74a, for example, every 90°. As a result, when the contact 72a passes through the notch 74a, it can generate a stronger sense of resistance than when it passes through the tooth surface of the gear 74 other than the notch 74a. In other words, the resistance generating portion 72 can generate a strong clicking or stopping sensation. At this time, the arrangement of each component is adjusted so that the fixed block 26 and the connecting block 22 face each other at the timing when the strong clicking or stopping sensation is generated by the contact of the notch 74a and the contact 72a. As a result, the fixed block 26 and the connecting block 22 can be easily and accurately aligned when the rotation of the slip table 12 is switched. The rotating gear 70a passes through the notch 74a at 90° intervals, but by adjusting the shape of the teeth of the gear 74 and the rotating gear 70a, the rotating gear 70a can pass through the notch 74a smoothly, thereby emphasizing the strong clicking sensation when the contactor 72a and the notch 74a come into contact.

[0052] A drive wire 76 is connected to a swing arm 70b that pivotally supports the rotary gear 70a and a swing arm 72b that supports the contact 72a, and moves the rotary gear 70a and the contact 72a away from the gear 74 against the biasing force of the biasing member to place them in the second position. In the case of FIG. 14 , the drive wire 76 interconnects the three rotation guide units 70 and one resistance generator 72. A portion of the drive wire 76 is provided with an interlocking wire 76a that is connected to, for example, an operating unit 78 that can be rotated. By rotating the operating unit 78, for example, clockwise, the interlocking wire 76a and the drive wire 76 are wound up, and the swing arm 70b (rotation guide unit 70) and the swing arm 72b (resistance generator 72) are moved to the second position. Furthermore, by rotating the operating unit 78 counterclockwise, the interlocking wire 76a and the drive wire 76 are unwound, and the swing arm 70b (rotation guide unit 70) and the swing arm 72b (resistance generator 72) can be moved to the first position. In the case of FIG. 14, the operating units 78 are formed on each side of the third base plate 32, and by operating any one of the operating units 78, the three rotation guide units 70 and one resistance generator 72 can be moved in unison to the same position. As a result, the operating unit 78 can be easily operated (the positions of the rotation guide unit 70 and the resistance generator 72 can be switched) regardless of the rotation state of the slip table 12. Note that the drive wire 76 and the operating unit 78 may be configured to swing the rotation guide unit 70 and the resistance generator 72 separately.

[0053] In the example shown in FIG. 14 , a total of four components (four points), including three rotation guides 70 and one resistance generator 72, contact the first base plate 28 in the first position, thereby centering the first base plate 28. Centering of the first base plate 28 can be performed at a minimum of three points. For example, two rotation guides 70 and one resistance generator 72 may be arranged at intervals of 120° relative to the first base plate 28, and a similar effect can be achieved. Furthermore, as long as at least two rotation guides 70 and one resistance generator 72 are included, five or more points of support may be used. In addition, while the example shown in FIG. 14 shows the rotation guides 70 and the resistance generator 72 arranged on the fourth base plate 38, they may be arranged at other positions as long as they allow centering of the first base plate 28 in the first position, and a similar effect can be achieved.

[0054] Also, in FIG. 14, an example is shown in which the notches 74a are formed at 90° intervals to match the spacing between the fixed blocks 26. In this case, a strong clicking sensation or stopping feeling can be obtained every time the slip table 12 rotates 90°, but the notches 74a may be formed at other intervals. For example, when the number of fixed blocks 26 is increased, the notches 74a may be formed at 45° intervals or at 30° intervals on the second base plate in accordance with the increased number. In this case, the clicking sensation or stopping feeling can be obtained at an even smaller rotation angle when the slip table 12 rotates. As a result, the positioning ability of the slip table 12 when rotating can be improved.

[0055] In another embodiment, the resistance generating portion 72 may be omitted, and a ratchet mechanism that provides a clicking sensation when the rotating gear 70a rotates may be provided on at least one rotating gear 70a of the three or more rotation guide portions 70, and indicators such as marks may be provided on both the fixed block 26 and the connecting block 22 to confirm the facing positions at which the fixed block 26 and the connecting block 22 can be connected. In this case, the index on the fixed block 26 and the index on the connecting block 22 may be aligned while the rotational position of the slip table 12 (fixed block 26) is confirmed by the clicking sensation. In this case, it is easy to simplify the configuration that provides the clicking sensation or stopping sensation, and it is possible to improve the positioning ability of the slip table 12 during rotation.

[0056] In the examples of FIGS. 14 and 15 , the rotation guide unit 70 and the resistance generator 72 are switched between the first position and the second position by swinging in the circumferential direction of the first base plate 28. In another embodiment, the rotation guide unit 70 and the resistance generator 72 may be switched between the first position and the second position by moving in the radial direction of the first base plate 28. Also, circumferential swinging and radial movement may be combined. In the example of FIG. 14 , the rotation guide unit 70 and the resistance generator 72 are switched between the first position and the second position by a switching mechanism using a drive wire 76. Other switching mechanisms may be used as long as they are capable of switching between the first position and the second position. For example, a link mechanism, a motor-driven mechanism, or the like may be used as the switching mechanism, and similar effects can be obtained.

[0057] FIG. 16 is a schematic side view showing an example of another configuration that makes it easy to feel a click and a temporary stop at the position where the fixed block 26 faces the connecting block 22. In FIG.

[0058] In the modified example shown in Fig. 16, the first base plate 28 has a multi-layer structure including, for example, a first layer 28M and a second layer 28N in the thickness direction (vertical direction). A gear 74, for example, is formed around the entire outer periphery of the first layer 28M. Furthermore, four notches 74a (three are visible in Fig. 16) are formed at 90° intervals on the outer periphery of the second layer 28N. In other words, the gear 74 and the contact 72a are formed in different regions. The stacking order of the first layer 28M and the second layer 28N may be reversed.

[0059] In this modified example, the rotation guide portions 70 formed on the three fourth base plates 38 correspond to the height of the first layer 28M. When the rotation guide portions 70 are switched to the first position, i.e., when the slip table 12 is rotated and positioned, the gears 74 formed on the entire outer surface of the first layer 28M and the rotation gear 70a are always engaged. Similarly, the resistance generating portion 72 formed on one fourth base plate 38 corresponds to the height of the second layer 28N. When the resistance generating portion 72 is switched to the first position, i.e., when the slip table 12 is rotated and positioned, the notches 74a formed at 90-degree intervals on the outer surface of the second layer 28N engage with the contacts 72a every 90 degrees, generating a clicking sensation or a stopping sensation. In other words, no clicking sensation or a stopping sensation is generated at positions where the notches 74a are not formed.

[0060] 14 and 15, the contactor 72a contacts both the gear 74 and the notch 74a, so a clicking sensation or a stopping sensation is always felt. When the contactor 72a engages with the notch 74a, a stronger clicking sensation or a stopping sensation is felt, allowing the rotation position to be confirmed. In this case, although it takes some experience and practice to determine the clicking sensation or the stopping sensation when the contactor 72a engages with the notch 74a, it is possible to make the first base plate 28 thinner and simplify the configuration, which contributes to reducing manufacturing costs and making the device more compact and lightweight.

[0061] On the other hand, in the configuration shown in Figure 16, a clicking or stopping sensation is obtained only when the contact 72a engages with the notch 74a, making it possible for the user of the vibration generating device 10 to easily and accurately recognize the position where the fixed block 26 faces the connecting block 22.

[0062] In the above description, an example has been shown in which the rotation guide units 70 are arranged in three locations on the fourth base plates 38 provided at the four corners of the first base plate 28, but the rotation guide units 70 may be arranged on all four corners of the fourth base plates 38. In this case, the rotation guide unit 70 and the resistance generating unit 72 are arranged in a stacked state at one location on the fourth base plate 38 at the four corners. In this case, the first base plate 28 can be supported at four points by the four rotation guide units 70 arranged at 90° intervals, and accurate centering of the first base plate 28 can be achieved with more stable rotation.

[0063] 11 of the above-described embodiment shows an example in which the connecting blocks 22 and the guide members 56 for guiding the connecting blocks 22 are formed only on the side closer to the vibration table 18. In other embodiments, connecting blocks 22 and guide members 56 for guiding the connecting blocks 22 may also be provided on the side farther from the vibration table 18, sandwiching the slip table 12 therebetween. That is, during a vibration test, the slip table 12 is guided by a pair of connecting blocks 22 arranged on a straight line parallel to the vibration direction (the direction of arrow X in FIG. 1 ). As a result, a more stable vibration test of the slip table 12 can be performed. Note that when the slip table 12 is rotated to change the vibration direction of the specimen 66, the additional connecting block 22 on the side farther from the vibration table 18 can be moved further away from the slip table 12 along the guide members 56. As a result, when the slip table 12 is rotated, the slip table 12 does not interfere with the additional connecting block 22, and the vibration test direction of the specimen 66 can be easily and smoothly changed.

[0064] In the above-described embodiment, four first fluid supply portions 40a and eight second fluid supply portions 40b and third fluid supply portions 42a are formed. However, the number of first fluid supply portions 40a, second fluid supply portions 40b, and third fluid supply portions 42a can be appropriately increased or decreased as long as the first fluid film 44a, second fluid film 44b, and third fluid film 44c can be uniformly formed over a wide area. Furthermore, the arrangement pattern can also be appropriately changed, and the same effect as in this embodiment can be obtained.

[0065] Although the embodiments and modifications of the present invention have been described, these embodiments and modifications are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0066] 10...Vibration generator, 12...Slip table, 12a...Placement surface, 14...Vibration generating section, 22...Connecting block, 24...Fluid recycling section, 26...Fixed block, 28...First base plate, 28a...First surface, 28b...Second surface, 30...Second base plate, 30a...Third surface, 30b...Fourth surface, 32...Third base plate, 32a...Fifth surface, 34...Protrusion, 36 ...Opening, 40...First flow path, 40a...First fluid supply portion, 40b...Second fluid supply portion, 42...Second flow path, 42a...Third fluid supply portion, 44a...First fluid film, 44b...Second fluid film, 44c...Third fluid film, 46...Pocket, 46a...Land, 66...Test piece, 70...Rotation guide portion, 70a...Rotation gear, 72...Resistance generating portion, 72a...Contactor, 74...Gear, 74a...Notch portion.

Claims

1. a plate-like vibration table that is detachable from a vibration generating unit that generates vibrations in the first direction and that can fix a specimen that is a target of a vibration test to a mounting surface thereof; a plate-like first base plate having a protruding portion on a first surface thereof, the protruding portion being fixed to a substantially flat sliding surface on the opposite side of the mounting surface of the vibration table, the first base plate being slidable in the first direction and rotatable around the protruding portion; a flat, plate-like second base plate provided between the vibration table and the first base plate, the second base plate including a third surface facing the sliding surface, a fourth surface facing the first surface, and an opening penetrating between the third surface and the fourth surface and through which the protrusion is inserted; a third base plate including a fifth surface facing the second surface opposite the first surface, the third base plate supporting the first base plate in a slidable manner in cooperation with the second base plate; Equipped with the second base plate has a first fluid supply unit that injects a fluid onto the sliding surface to form a first fluid film between the sliding surface and the third surface, and a second fluid supply unit that injects a fluid onto the first surface to form a second fluid film between the first surface and the fourth surface, the third base plate has a third fluid supply unit that injects a fluid onto the second surface and forms a third fluid film between the fifth surface and the second surface; Vibration generator.

2. 2. The vibration generator according to claim 1, wherein the second fluid supply portion and the third fluid supply portion are formed in a plurality at equal intervals within the sliding range of the first base plate and are surrounded by lands of uniform height.

3. 3. The vibration generating device according to claim 1, wherein the protrusion is cylindrical, and a gap equal to or greater than the vibration stroke of the vibration generating unit is formed between the inner wall surface of the opening and the outer peripheral surface of the protrusion.

4. The vibration generator according to claim 1 , wherein the vibration table includes a plurality of fixing blocks on an outer edge thereof that are movable toward and away from the connecting block of the vibration generating unit.

5. The vibration generator according to claim 1 , wherein the fluid is oil that can circulate between the vibration generator and a drain pan.

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