Vibration generator

Abstract

To provide a vibration generating device that allows for easy modification of the vibration direction. [Solution] The vibration generating device comprises a vibration table, a first base plate, a second base plate, a third base plate, and a guide member. The vibration table is detachable from a vibration generating unit that generates vibrations in a first direction. The first base plate is plate-shaped, having a projection fixed to the sliding surface of the vibration table, and is slidable in the first direction and rotatable around the projection. The guide member guides the vibration table in the first direction. The second base plate has a first fluid supply unit that sprays fluid onto the sliding surface to form a first fluid film between the sliding surface and a third surface, and a second fluid supply unit that sprays fluid onto the first surface to form a second fluid film between the first surface and a fourth surface. The third base plate has a third fluid supply unit that sprays fluid onto the second surface to form a third fluid film between the fifth surface and the second surface.

Description

Technical Field

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

Background Art

[0002] Conventionally, a vibration generating device for vibrating a test specimen, which is an object of a vibration test, is known. For example, a vibration generating device using a fluid bearing and a multi-directional type vibration generating device capable of changing the vibration applying direction have been proposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] The above-described conventional vibration generating device can perform a multi-directional vibration test without replacing the test specimen, but the structure for switching the vibration direction is complicated, handling is cumbersome, and it has been one of the causes of cost increase.

[0005] The present invention has been made in view of the above, and if a vibration generating device capable of changing the vibration direction with an easy configuration can be provided, a more efficient vibration test can be easily performed, and the test cost and the manufacturing cost of the device can be reduced, which is meaningful.

Means for Solving the Problems

[0006] To solve the above-mentioned problems and achieve the objective, the vibration generating device according to the present invention comprises a vibration table, a first base plate, a second base plate, a third base plate, and a guide member. The vibration table is a plate-shaped member that is detachable from a vibration generating unit that generates vibrations in a first direction and can fix a test specimen, which is the subject of vibration testing, to its mounting surface. The first base plate has a projection on its first surface that is fixed to a substantially flat sliding surface on the opposite side of the mounting surface of the vibration table, and is a plate-shaped member that is slidable in the first direction and can also pivot around the projection. The second base plate has a third surface facing the sliding surface, a fourth surface facing the first surface, and an opening that penetrates between the third and fourth surfaces and through which the projection is inserted, and is a flat plate-shaped member interposed between the vibration table and the first base plate. The third base plate has a fifth surface facing the second surface on the opposite side of the first surface, and cooperates with the second base plate to slidably support the first base plate. The guide member guides the vibrating table in the first direction. The second base plate has a first fluid supply unit that sprays 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 sprays 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 sprays fluid onto the second surface to form a third fluid film between the fifth surface and the second surface. [Effects of the Invention]

[0007] The vibration generating device according to the present invention enables vibration testing in various directions with a simple configuration and easy operation without changing the test specimen, allowing for efficient vibration testing at low cost. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is an exemplary and schematic side view of a vibration generating device according to an embodiment. [Figure 2]Figure 2 is an exemplary and schematic plan view of the vibration table (slip table) of the vibration generating device according to the embodiment. [Figure 3] Figure 3 is an exemplary and schematic exploded perspective view of the first base plate, second base plate, and third base plate installed below the vibration table of the vibration generating device according to the embodiment. [Figure 4] Figure 4 is an exemplary and schematic cross-sectional perspective view of the vibration table, first base plate, second base plate, and third base plate of the vibration generating device according to the embodiment. [Figure 5] Figure 5 is an exemplary and schematic plan view of the second base plate of the vibration generating device according to the embodiment. [Figure 6] Figure 6 is an exemplary and schematic cross-sectional view of the vibration generating device according to the embodiment, showing a combination of the first base plate, second base plate, and third base plate. [Figure 7] Figure 7 is an exemplary and schematic cross-sectional view showing the flow channels formed in the second and third base plates of the vibration generating device according to the embodiment. [Figure 8] Figure 8 is an illustrative and schematic plan view showing the state in which the protrusion of the first base plate is exposed through the opening of the second base plate of the vibration generating device according to the embodiment. [Figure 9] Figure 9 is an exemplary and schematic perspective view showing a connecting block that can be connected to the vibration table of a vibration generator according to an embodiment. [Figure 10] Figure 10 is an exemplary and schematic perspective view showing the fluid circulation system in the vibration testing apparatus of the embodiment. [Figure 11] Figure 11 is an illustrative and schematic diagram showing the configuration of switching the connection of the vibration table of the vibration testing apparatus according to the embodiment. [Figure 12] Figure 12 is an exemplary and schematic plan view showing fluid distribution grooves that contribute to the formation of an oil film on the third surface of the second base plate of the vibration testing apparatus of the embodiment. [Figure 13]FIG. 13 is an exemplary and schematic plan view showing other 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 test apparatus according to the embodiment. [Figure 14] FIG. 14 is an exemplary and schematic plan view showing a configuration in which, in the vibration test apparatus according to the embodiment, a fixed block has a clicking feeling and is likely to obtain a once-stop feeling at a position facing the connecting block. [Figure 15] FIG. 15 is an exemplary and schematic exploded perspective view showing a configuration in which, in the vibration test apparatus according to the embodiment, a fixed block has a clicking feeling and is likely to obtain a once-stop feeling at a position facing the connecting block. [Figure 16] FIG. 16 is an exemplary and schematic side view showing another configuration in which, in the vibration test apparatus according to the embodiment, a fixed block has a clicking feeling and is likely to obtain a once-stop feeling at a position facing the connecting block.

MODE FOR CARRYING OUT THE INVENTION

[0009] Hereinafter, embodiments of the vibration generating device according to the present disclosure will be described in detail based on the drawings. Note that the present invention is not limited by this embodiment. Further, the following embodiments include those that can be replaced by those skilled in the art and can be easily conceived, or those that are substantially the same.

[0010] First, the overall configuration of the vibration generating device 10 according to the embodiment will be described. FIG. 1 is an exemplary and schematic side view of the vibration generating device 10 according to the embodiment.

[0011] The vibration generator 10 according to this embodiment is a device that conducts a vibration test by forcibly vibrating a test specimen (for example, a sample product submitted by a producer when requesting quality inspection). The vibration generator 10 is, for example, a device that conducts a test of applying vibration in a direction parallel to the surface plate (horizontal direction) or applying vibration in a direction perpendicular to the surface plate to a slip table 12 (vibration table) on which the test specimen is placed and fixed. FIG. 1 shows a state in which the vibration generator 10 is set in a state where it can apply vibration in a direction parallel to the surface plate, for example. Note that the vibration generator 10 can change its operating state so that it can apply vertical vibration by rotating the yoke 16 that constitutes the vibration generating unit 14, for example, 90° clockwise.

[0012] As shown in FIG. 1, the vibration generator 10 mainly includes a yoke 16 that constitutes the vibration generating unit 14, a vibration table 18, a base 20 that supports the vibration generating unit 14, a connecting block 22 that connects the slip table 12 and the vibration table 18, and a fluid recycling unit 24 for fluid provided below the slip table 12. The fluid used in the embodiment is an incompressible fluid, for example, oil. The fluid (oil) is used during the vibration operation and the turning operation of the slip table 12 described later.

[0013] The material of the yoke 16 can be, for example, a magnetic material with high magnetic permeability and high strength, and a low-carbon steel such as SS400 can be used. The material of the vibration table 18 can be, for example, a non-magnetic and 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 application direction (first direction) by the vibration generating unit 14 in the horizontal vibration mode.

[0014] The yoke 16 is equipped with an excitation coil (not shown) that generates a static magnetic field within the yoke 16, and a drive coil for generating vibration. The drive coil is positioned within the magnetic gap and is integrally configured with the vibration table 18. By passing a direct 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 alternating current of a predetermined frequency through the drive coil, a force acts between the static magnetic field generated in the magnetic gap and the alternating current flowing through the drive coil. Due to this force, the drive coil vibrates in a direction perpendicular to the direction of the magnetic flux. As a result, the vibration table 18 vibrates at the frequency of the alternating current flowing through the drive coil, and consequently, the test specimen, which is the object to be vibrated and attached to the slip table 12, vibrates in the direction of arrow X, and a vibration test is performed.

[0015] Figure 2 is an exemplary and schematic plan view of the slip table 12 of the vibration generator 10. The slip table 12 is a plate-shaped member that is detachable from the vibration generating unit 14 that generates vibrations in the direction of arrow X (first direction) in Figure 1, and can fix the test specimen, which is the subject of the vibration test, to the mounting surface 12a. The mounting surface 12a has, for example, a matrix of fixing screw holes 12b formed therein for fixing the test specimen. The test specimen can be fixed directly using the fixing screw holes 12b, or it can be fixed via a jig or the like. Note that the method of fixing the test specimen on the slip table 12 is just one example, and it may also be done by means of adsorption using air suction or electromagnetic force, for example.

[0016] The slip table 12 is equipped with multiple fixed blocks 26 on its outer edge that can be moved toward and away from a connecting block 22 integrated with the vibration generating unit 14. Details of the connecting block 22 will be described later. In the case of Figure 2, the slip table 12 has a mounting surface 12a that is approximately square in shape, and the fixed blocks 26 are positioned approximately in the center of its four outer edges. Therefore, by rotating the slip table 12 and changing the connection position of the fixed blocks 26 to the connecting block 22, even if the vibration direction of the vibration generating unit 14 is only in the direction of arrow X, the vibration test direction can be changed in 90° increments while maintaining the fixed state of the test specimen placed and fixed on the mounting surface 12a (without changing the mounting surface 12a of the test specimen). Note that the shape of the slip table 12 is not limited to approximately square, but may also be a polygon with five or more sides or a circle. If the slip table 12 is polygonal, it becomes possible to select the vibration direction corresponding to the number of sides. Furthermore, if the slip table 12 is circular in shape, any number of fixed blocks 26 can be formed along the outer circumference of the slip table 12, and a vibration direction corresponding to the number of fixed blocks 26 can be realized.

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

[0018] As shown in Figure 3, the first base plate 28 is, for example, a substantially disc-shaped member, and has a cylindrical projection 34 in the approximate center of the first surface 28a, which is one of the flat surfaces of the first base plate 28. The second base plate 30 is a flat plate-shaped component interposed between the slip table 12 and the first base plate 28, as shown in Figures 3 and 4. The second base plate 30 has a third surface 30a facing the substantially 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 projection 34 of the first base plate 28 is inserted. Furthermore, the third base plate 32 is a plate-shaped component having a fifth surface 32a that faces the second surface 28b on the opposite side of the first surface 28a of the first base plate 28. 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, for example, a fourth base plate 38, which is formed to be slightly thicker than the thickness of the first base plate 28 determined by the first surface 28a and the second surface 28b, and is roughly pentagonal in shape in plan view, is positioned, for example, at the four corners. The fourth base plate 38 functions as a spacer to secure a predetermined gap (the thickness of the first base plate 28 + a gap for oil film formation, which will be described later) between the second base plate 30 and the third base plate 32. The shape of the fourth base plate 38 is just one example. In this embodiment, it is approximately pentagonal in shape to avoid interference with the disc-shaped first base plate 28. However, any other shape is acceptable as long as it is a spacer shape that avoids interference with the first base plate 28. For example, it may be cylindrical, square, or triangular in plan view. Furthermore, the fourth base plate 38 may be formed as a projection integrated with the fourth surface 30b of the second base plate 30 or the fifth surface 32a of the third base plate 32, and can function similarly.

[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, as shown in Figure 6, the projection 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 projection 34 protrudes slightly from the third surface 30a. The upper surface 34a of the projection 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 rotate 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 rotation in the direction of arrow X in Figure 1).

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

[0021] The first flow channel 40 formed in the second base plate 30 injects a fluid, such as oil, from the first fluid supply unit 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] Figure 8 is an illustrative and schematic plan view showing the state in which the protruding portion 34 (upper surface 34a) of the first base plate 28 is exposed through the opening 36 of the second base plate 30 of the vibration generating device 10. The diameter R of the roughly circular opening 36 is formed to be larger than the diameter r of the cylindrical protruding portion 34 that penetrates the opening 36 by a gap S corresponding to or greater than the vibration stroke of the vibration table 18 in the direction of arrow X (see Figure 1) (for example, 50 mm to 60 mm). Therefore, when the vibration table 18 is excited, a non-contact state can be ensured between the inner wall surface 36a of the opening 36 and the outer circumferential surface 34b of the protruding portion 34.

[0023] Furthermore, four first fluid supply units 40a are arranged at equal intervals around the opening 36. By ejecting fluid from each first fluid supply unit 40a, a wide 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 movements relative to the second base plate 30.

[0024] Furthermore, as shown in Figure 7, the first flow channel 40 injects a fluid, such as oil, from the 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 channel 42 injects a fluid, such as oil, from the 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] Multiple second fluid supply units 40b and third fluid supply units 42a are arranged, for example, at equal intervals, within the range in which the first base plate 28 can move when sliding (during vibration in the direction of arrow X in Figure 1). As shown in Figure 5, for example, the second fluid supply units 40b are provided in four locations in sets of two, for a total of eight locations. Similarly, as shown in Figures 3 and 4, multiple third fluid supply units 42a are also arranged, for example, at equal intervals, within the range in which the first base plate 28 can move when sliding (during vibration in the X direction). For example, the third fluid supply units 42a are provided in four locations in sets of two, for a total of eight locations. Note that in the cross-sectional view of Figure 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 a similar configuration at corresponding positions on the first surface 28a and second surface 28b sides 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 explained using Figure 4. As shown in Figure 4, a land 46a of uniform height is formed around the third fluid supply unit 42a, forming a pocket 46 that surrounds the third fluid supply unit 42a. The pocket 46 can store a certain amount of fluid. The height of the land 46a (height of the pocket 46) can be determined according to the thickness of the third fluid film 44c to be formed. The height of the land 46a can be, for example, about 2 to 6 mm. Therefore, the thickness of the third fluid film 44c is determined by the height of the land 46a + the amount by which the fluid should push up the first base plate 28 when it overflows. Similarly, a pocket 46 surrounded by lands 46a is formed around the second fluid supply section 40b, forming a second fluid film 44b of a predetermined thickness. The height of the lands 46a (height of the pocket 46) relative to the second fluid supply section 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 lands 46a plus the amount by which the fluid should push down the first base plate 28 when it overflows.

[0027] In this way, in the vibration generating device 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 are 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 section 14) via the connecting block 22, the slip table 12 can be smoothly moved back and forth (slid) in the direction of arrow X in Figure 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 detach from the joint between the second base plate 30 and the third base plate 32. After rotating the slip table 12, by connecting the connecting block 22 to one of the multiple fixing blocks 26 formed on the outer edge of the slip table 12, vibration tests can be performed on the test specimen in other directions while maintaining the state in which the test specimen is fixed to the slip table 12 with respect to the vibration direction of the vibration table 18.

[0028] As shown in Figure 7, the first channel 40 and the second channel 42 are connected by a connecting pipe 48, allowing the fluid (oil) used in the first channel 40 and the second channel 42 to be shared. As shown in Figure 5, the first channel 40 formed in the second base plate 30 is formed, for example, in a grid pattern. Each channel constituting the first channel 40 and the second channel 42 has a start end and an end end formed on the outer edge of the second base plate 30 and the third base plate 32, respectively, during manufacturing. One of the multiple start ends and end ends is used as a fluid supply port, and the others are sealed with, for example, a stopper 50. The circulation of the fluid using the first channel 40 and the second channel 42 will be described later.

[0029] Figure 9 is an exemplary and 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 generating device 10.

[0030] The connecting block 22 is a plate-like component with a roughly T-shape in plan view. Multiple (e.g., four) diagonally extending counterbore holes 54 are formed on the upper surface 22a side for fastening members 52 (e.g., bolts) to connect and fix to the vibration table 18, extending from the upper surface 22a to the side surface 22b. On the lower surface 22c, which is the opposite side of the upper surface 22a, guide members 56 are fixed to smoothly and stably guide the connecting block 22 in the vibration direction of the vibration table 18 (arrow X direction in Figure 1) without generating vibrations in directions other than arrow X (e.g., vibrations in perpendicular directions). Two guide members 56 are fixed parallel to the arrow X direction. For example, well-known linear guides can be used as guide members 56.

[0031] Furthermore, on the side 22d opposite to the side 22b of the connecting block 22, there are multiple screw holes 58 into which fastening members (e.g., bolts) for connecting and fixing the fixing block 26 of the slip table 12 and the connecting block 22, as shown in Figure 4, are screwed. As shown in Figure 4, in order to allow the fastening members to advance from the mounting surface 12a of the slip table 12 to the side 22d of the connecting block 22, multiple (e.g., four) diagonally extending counterbore holes 26a that communicate with the insertion holes 26b are formed on the mounting surface 12a.

[0032] In this way, by connecting and fixing the fixed block 26 and the connecting block 22 formed on the slip table 12 by accessing them from the mounting surface 12a side of the slip table 12, the slip table 12 can be rotated to easily and efficiently change the vibration direction of the test specimen.

[0033] Figure 10 is an illustrative and schematic perspective view showing the fluid (oil) circulation system in the vibration generator 10. As described above, the vibration generator 10 circulates fluid within its fluid system in both cases: during vibration operation of the slip table 12 (during vibration testing) and during rotational operation to change the direction of vibration relative to the test specimen while the test specimen remains fixed to the mounting surface 12a of the slip table 12. That is, during vibration testing and rotational switching of the vibration generator 10, fluid is constantly ejected from the first fluid supply section 40a, the second fluid supply section 40b, and the third fluid supply section 42a, forming the first fluid film 44a, the second fluid film 44b, and the third fluid film 44c.

[0034] The fluid recycling unit 24 shown in Figure 10 houses a storage tank, a suction filter, a pump, a relief valve, a switching valve, etc. The storage tank stores oil as the fluid that circulates within the circulation system. The suction filter removes foreign matter from the circulating fluid (oil) and purifies it. The pump sends the fluid (oil) from the storage tank in a compressed state through the relief valve, switching valve, etc., and ejects it from the first fluid supply unit 40a, etc. The discharge pressure of the fluid at this time is, for example, 3 MPa to 7 MPa. The discharged fluid is supplied to the third base plate 32 via the supply pipe 60, for example, from the fluid inlet 32b of the third base plate 32. As the supplied fluid flows through the second flow path 42, it is injected from the third fluid supply unit 42a to form a third fluid film 44c. When the fluid reaches the 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 channel 40, it is ejected from the first fluid supply section 40a and the second fluid supply section 40b, forming the first fluid film 44a and the second fluid film 44b. The fluid W that 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 that 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. In addition, the fluid W that 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 along with the fluid W that was functioning as the second fluid film 44b. The fluid W collected in the drain pan 62 is sucked in by the negative pressure generated by the pump of the fluid recycling unit 24, returned to the storage tank of the fluid recycling unit 24 via the return path 64, filtered by a suction filter, and then reused again for oil film formation.

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

[0036] In the configuration CS1 of Figure 11, a connecting block 22, which is connected to the vibration table 18 and guided by a guide member 56, is connected to a first fixed block 26M, one of the fixed blocks 26 provided on the outer edge of the slip table 12. The connection between the first fixed block 26M and the connecting block 22 is made by a fastening member. Therefore, when the vibration table 18 vibrates in the direction of arrow X in Figure 1, the test specimen 66 is excited along the longitudinal side 66b perpendicular to the short side 66a, and the vibration test is performed. In this case, since the connecting block 22 is guided by the guide member 56 and the slip table 12 is supported by a fluid bearing such as the first fluid membrane 44a, the test specimen 66 is excited parallel to the mounting surface of the guide member 56 (e.g., a surface plate) and stably, and a high-precision vibration test is performed.

[0037] Figure 11, aspect CS2, shows a state in which the connecting block 22 has been separated from the first fixed block 26M of the slip table 12 in order to perform vibration tests on the test specimen 66 in another direction after the vibration test of the test specimen 66 has been completed. Separation of the first fixed block 26M and the connecting block 22 can be achieved by removing the fastening member from the insertion hole 26b, as explained in Figures 4 and 9.

[0038] Next, as shown in embodiment CS3 of Figure 11, with the test specimen 66 fixed to the mounting surface 12a, the slip table 12 is rotated, for example, counterclockwise. In this case, the diameter R of the opening 36 of the second base plate 30 is formed to be larger by a gap S than the diameter r of the protrusion 34 of the first base plate 28, so 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 (fixing block 26) can be rotated without interfering with the connecting block 22. Furthermore, as mentioned above, even during rotation, the first fluid film 44a, the second fluid film 44b, and the third fluid film 44c are formed, so the slip table 12 can rotate smoothly, stably, and easily.

[0039] Embodiment CS4 shows a state in which the slip table 12 has been rotated 90° counterclockwise, resulting in the second fixed block 26N facing the first fixed block 26M formed on the connecting block 22. In this case, if the fixed block 26 is configured to stop with a click when it faces the connecting block 22, the rotational movement of the slip table 12 can be performed easily and accurately.

[0040] Embodiment CS5 shows a state in which the second fixed block 26N, which has been moved to a position opposite the connecting block 22, is connected to the connecting block 22. In this case, it is necessary to bring the slip table 12 closer to the connecting block 22, but even in this case, since the first fluid film 44a, etc., remains formed, the second fixed block 26N of the slip table 12 can be easily and smoothly brought closer to the connecting block 22. In this state, the fastening member is inserted into the insertion hole 26b of the second fixed block 26N and screwed in, thereby completing the fixing of the slip table 12 (second fixed block 26N) and the connecting block 22. In this case, the test 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 arrow X in Figure 1, the test specimen 66 is excited along the transverse side 66a which is perpendicular to the longitudinal side 66b, and the vibration test is performed. In other words, the vibration test direction for the test specimen 66 can be changed without removing the test specimen 66 from the slip table 12, making it possible to easily and efficiently perform high-precision vibration tests.

[0041] Furthermore, vibration tests generate force moments 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 section 40a, the second fluid supply section 40b, and the third fluid supply section 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 vertically with the first base plate 28 in between. As a result, it becomes possible to generate a strong counterforce on the first base plate 28. This counterforce can be changed to a desired magnitude by changing the pressure of the supplied fluid (oil). Therefore, by adjusting the fluid pressure, it is possible to effectively suppress vibrations of the test specimen 66 (slip table 12) in directions other than the vibration direction, further improving the accuracy of the vibration test. Furthermore, by positioning the pockets 46 (second fluid supply section 40b, third fluid supply section 42a) within the plane projection area of ​​the first base plate 28, even when the slip table 12 (first base plate 28) is sliding or rotating, counteracting forces can be efficiently generated.

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

[0043] Figure 12 is an exemplary and schematic plan view showing a fluid distribution groove 68 that contributes 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, the fluid distribution groove 68 is formed starting from the first fluid supply section 40a and is formed to distribute 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 Figure 12, the first fluid supply section 40a and the fluid distribution groove 68 are connected in the plane of the third surface 30a, and fluid flows smoothly along the fluid distribution groove 68, so that fluid can be stably supplied over a wide area of ​​the third surface 30a. As a result, a stable, substantially uniform pressure area is formed by the fluid distribution groove 68 connected to each first fluid supply section 40a. Furthermore, the fluid that spreads over a wide area (first fluid film 44a) dampens micro-vibrations (crosstalk components) other than the normal vibration direction (X direction in Figure 1) that occur due to chatter vibration and resonance of the test specimen 66 and the slip table 12 during vibration testing of the slip table 12, enabling accurate vibration testing. The configuration of the fluid distribution groove 68 in Figure 12 is an example in which the fluid distribution groove 68, starting from the first fluid supply section 40a, forms multiple substantially rectangular pressure areas around the opening 36, uniformly supporting the sliding surface 12c of the slip table 12.

[0045] Figure 13 is an exemplary and schematic plan view showing other fluid distribution grooves 68a 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. In Figure 13, multiple first fluid supply units 40a and fluid distribution grooves 68a are connected in the plane of the third surface 30a, forming a rectangular pressure area surrounding the opening 36. In this case as well, since the fluid flows smoothly along the fluid distribution grooves 68a, the fluid can be stably supplied to a wide area of ​​the third surface 30a. As a result, a stable, substantially uniform pressure area is formed by the fluid. In this case as well, the fluid that spreads over a wide area (first fluid film 44a) dampens micro-vibrations (crosstalk components) other than the normal vibration direction (X direction in Figure 1) that are generated by chatter vibrations and resonance of the test specimen 66 and the slip table 12 during vibration testing of the slip table 12, enabling accurate vibration testing.

[0046] The plan view in Figure 14 and the exploded perspective view in Figure 15 are explanatory diagrams illustrating a configuration in the CS4 configuration of Figure 11 in which the fixed block 26 (second fixed block 26N) has a click sensation when it faces the connecting block 22, making it easier to feel that it has stopped temporarily.

[0047] As explained in Figure 11, in embodiment CS2, when the connection between the connecting block 22 and the fixed block 26 is released, the first base plate 28 is supported between the second base plate 30 and the third base plate 32 in a substantially non-contact, free state by a fluid bearing formed by the second fluid membrane 44b and the third fluid membrane 44c. If a fixed rotating shaft exists on the first base plate 28, during vibration testing, for example, during horizontal excitation, the fixed rotating shaft may be subjected to horizontal shear stress, which could cause wear or damage to the rotating shaft and impair its rotational function. On the other hand, in the case of the first base plate 28 of this embodiment, which does not have a fixed rotating shaft, vibration testing and switching of the connection state of the slip table 12 (first base plate 28) can be performed without causing the above-mentioned inconveniences. However, because 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 rotation center of the first base plate 28, and aligning the fixed block 26 and the connecting block 22 can become complicated.

[0048] Therefore, as shown in Figures 14 and 15, a rotation guide section 70 that guides from multiple directions and a resistance generating section 72 that creates a clicking sensation are arranged so as to surround the outer circumference of the first base plate 28. Figure 14 shows the 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 case of Figure 14, the rotation guide section 70 is arranged on three of the fourth base plates 38 which are arranged at the four corners of the third base plate 32, and the resistance generating section 72 is arranged on the other fourth base plate 38.

[0049] Furthermore, a gear 74 is provided around the outer circumferential surface of the first base plate 28. The gear 74 can mesh with a rotating gear 70a, which is rotatably supported by the rotating guide portion 70. The rotating 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 rotating gear 70a are meshed with the fourth base plate 38 and a second position (shown by a dashed line) in which they are not meshed. The swing arm 70b is pivotably supported by the fourth base plate 38. The swing arm 70b is biased clockwise by a biasing member (for example, a leaf spring or a helical spring) not shown in the figure to form the first position in which the gear 74 and the rotating gear 70a are meshed. Furthermore, the fourth base plate 38 or the fourth base plate 38 has a stopper (not shown) formed therein, which is positioned so that the rotating gear 70a, which is pivotally supported by the swing arm 70b, stops facing the direction of approximately the center position of the protrusion 34 when it is in the first position.

[0050] On the other hand, the resistance generating unit 72 supports a contact element 72a, which is circumferentially flexible on the first base plate 28, by a swing arm 72b. The contact element 72a is engageable with a gear 74 formed around the first base plate 28 and a notch 74a formed in a part of it. The swing arm 72b is pivotably supported on the fourth base plate 38. Therefore, the resistance generating unit 72 is pivotable between a first position (shown by a solid line) in which the contact element 72a is in contact with the gear 74 or the notch 74a, and a second position (shown by a dashed line) in which the contact element 72a is not in contact with the gear 74 or the notch 74a. The swing arm 72b, like the swing arm 70b, is biased clockwise by a biasing member (e.g., a leaf spring or a helical spring) not shown, to form the first position in which the contact element 72a is in contact with the gear 74 or the notch 74a. The fourth base plate 38 or the fourth base plate 38 has a stopper (not shown) formed therein that stops the contactor 72a, supported by the swing arm 72b, from facing approximately the center position of the projection 34 when it is in the first position. The notches 74a are recesses formed deeper than the tooth height of the gear 74, and are formed, for example, at 90° intervals around the first base plate 28.

[0051] As shown in Figure 14, the first base plate 28 is supported from all four sides when the rotation guide portion 70 and the resistance generating portion 72 are in the first position, 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 contactor 72a contacts the notch 74a, for example, every 90°. As a result, when the contactor 72a passes through the notch 74a, it can generate a stronger 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 click 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 a strong click or stopping sensation is obtained due to the contact between the notch 74a and the contactor 72a. As a result, the alignment of the fixed block 26 and the connecting block 22 when switching the rotation of the slip table 12 can be easily and accurately performed. Although the rotating gear 70a passes through the notches 74a at 90° intervals, by adjusting the tooth shapes of the gear 74 and the rotating gear 70a, the rotating gear 70a can pass through the notches 74a smoothly, and the strong click sensation when the contact element 72a and the notches 74a come into contact can be emphasized.

[0052] A drive wire 76 is connected to the swing arm 70b that pivotally supports the rotating gear 70a and the swing arm 72b that supports the contact element 72a, thereby moving the rotating gear 70a and the contact element 72a away from the gear 74 against the biasing force of the biasing member to a second position. In the case of Figure 14, the drive wire 76 interconnects three rotating guide sections 70 and one resistance generating section 72. In addition, a linkage wire 76a is provided on a part of the drive wire 76, which is connected to, for example, a rotatable operating section 78. By rotating the operating section 78, for example in a clockwise direction, the linkage wire 76a and the drive wire 76 are wound up, moving the swing arm 70b (rotating guide section 70) and the swing arm 72b (resistance generating section 72) to the second position. Furthermore, by rotating the operating unit 78 counterclockwise, the interlocking wire 76a and the drive wire 76 are rewound, allowing the swing arm 70b (rotation guide unit 70) and the swing arm 72b (resistance generating unit 72) to be moved to the first position. In the case of Figure 14, operating units 78 are formed on each side of the third base plate 32, but by operating any one of the operating units 78, the three rotation guide units 70 and the one resistance generating unit 72 can be moved to the same state in conjunction. As a result, the operation of the operating unit 78 (switching the position of the rotation guide unit 70 and the resistance generating unit 72) can be easily performed 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 generating unit 72 individually.

[0053] In Figure 14, a total of four components (four points) consisting of three rotating guide sections 70 and one resistance generating section 72 contact the first base plate 28 in the first position, illustrating an example of centering the first base plate 28. Centering of the first base plate 28 can be achieved at a minimum of three points; for example, two rotating guide sections 70 and one resistance generating section 72 may be arranged at, for example, 120° intervals relative to the first base plate 28, and a similar effect can be obtained. Furthermore, it is sufficient to include at least two rotating guide sections 70 and one resistance generating section 72, and the base plate may be supported at five or more points. In addition, in Figure 14, an example is shown in which the rotating guide sections 70 and resistance generating section 72 are arranged on the fourth base plate 38, but as long as centering of the first base plate 28 is possible in the first position, they may be provided in other positions, and a similar effect can be obtained.

[0054] Furthermore, Figure 14 shows an example in which the notches 74a are formed at 90° intervals to match the spacing of the fixed blocks 26. In this case, a strong click or stopping sensation can be obtained each time the slip table 12 rotates 90°, but the notches 74a may be formed at other intervals. For example, if the number of fixed blocks 26 is increased, the notches 74a may be formed at 45° intervals or 30° intervals on the second base plate, etc., to match the increase in the number. In this case, it is possible to obtain a click or stopping sensation when the slip table 12 rotates at even finer rotation angles. As a result, the positioning accuracy when the slip table 12 rotates can be improved.

[0055] In another embodiment, the resistance generating unit 72 may be omitted, and a ratchet mechanism that provides a click sensation when the rotating gear 70a of at least one of the three or more rotating guide units 70 is provided, and indicators such as marks that allow confirmation of the opposing positions where the fixed block 26 and the connecting block 22 can be connected may be provided on both the fixed block 26 and the connecting block 22. In this case, the rotational position of the slip table 12 (fixed block 26) may be confirmed by the click sensation, and the positioning of the indicator on the fixed block 26 side and the indicator on the connecting block 22 side may be aligned. In this case, it is possible to simplify the configuration that provides a click sensation or stopping sensation, and the positioning accuracy when the slip table 12 rotates can be improved.

[0056] In the examples shown in Figures 14 and 15, the first and second positions are switched by the rotation guide section 70 and the resistance generating section 72 oscillating in the circumferential direction of the first base plate 28. In another embodiment, the rotation guide section 70 and the resistance generating section 72 may switch between the first and second positions by moving in the radial direction of the first base plate 28. Alternatively, a combination of circumferential oscillation and radial movement may be used. Furthermore, in the example in Figure 14, the switching between the first and second positions of the rotation guide section 70 and the resistance generating section 72 is shown using a switching mechanism with a drive wire 76. Other switching mechanisms may be used as long as they enable switching between the first and second positions. The switching mechanism may be, for example, a link mechanism or a motor drive mechanism, and similar effects can be obtained.

[0057] Figure 16 is an illustrative and schematic side view showing another configuration in which the fixed block 26 can easily be stopped with a click sensation when it faces the connecting block 22.

[0058] In the modified example shown in Figure 16, the first base plate 28 is composed of a multilayer structure comprising, for example, a first layer 28M and a second layer 28N in the thickness direction (vertical direction). For example, a gear 74 is formed all around the outer surface of the first layer 28M. Also, for example, four notches 74a are formed on the outer surface of the second layer 28N at 90° intervals (three are visible in Figure 16). In other words, the gear 74 and the contacts 72a are formed in different regions. Note that the stacking order of the first layer 28M and the second layer 28N may be reversed.

[0059] In the modified configuration, the rotation guide portions 70 formed on the three fourth base plates 38 are formed corresponding to the height of the first layer 28M, and when the rotation guide portions 70 switch to the first position, i.e., when the slip table 12 is rotated and positioned, the gear 74 formed around the entire circumference of the outer surface of the first layer 28M and the rotation gear 70a are always engaged. Similarly, the resistance generating portion 72 formed on one of the fourth base plates 38 is formed corresponding to the height of the second layer 28N, and when the resistance generating portion 72 switches to the first position, i.e., when the slip table 12 is rotated and positioned, the notches 74a formed at 90° intervals on the outer surface of the second layer 28N and the contacts 72a engage at 90° intervals, generating a click or stopping sensation. In other words, no click or stopping sensation occurs at positions where the notches 74a are not formed.

[0060] In the configurations shown in Figures 14 and 15 above, the contact element 72a contacts both the gear 74 and the notch 74a, so a clicking or stopping sensation is always present. When the contact element 72a engages with the notch 74a, a stronger clicking or stopping sensation is obtained, allowing for confirmation of the rotational position. In this case, judging the clicking or stopping sensation when the contact element 72a engages with the notch 74a requires some practice and experience, but it allows for a thinner first base plate 28 and a simpler configuration, contributing to reduced manufacturing costs and miniaturization and weight reduction of the device.

[0061] On the other hand, in the configuration shown in Figure 16, a click or stopping sensation is obtained only when the contact element 72a engages with the notch 74a, making it easier and more accurate for the user of the vibration generator 10 to recognize the position where the fixed block 26 faces the connecting block 22.

[0062] In the above explanation, an example was shown in which the rotation guide sections 70 are placed at three of the four fourth base plates 38 located at the four corners of the first base plate 28. However, the rotation guide sections 70 may also be placed at all four corner fourth base plates 38. In this case, the rotation guide section 70 and the resistance generating section 72 are stacked together at one of the corner fourth base plates 38. In this case, the first base plate 28 can be supported at four points by the four rotation guide sections 70 arranged at 90° intervals, and the centering of the first base plate 28 can be accurately achieved with more stable rotation.

[0063] In Figure 11 of the above-described embodiment, an example is shown in which the connecting block 22 and the guide member 56 that guides the connecting block 22 are formed only on the side closer to the vibration table 18. In other embodiments, the connecting block 22 and the guide member 56 that guides the connecting block 22 may also be provided on the side further away from the vibration table 18, with the slip table 12 in between. That is, during vibration testing, the slip table 12 is guided by a pair of connecting blocks 22 arranged in a straight line parallel to the vibration direction (arrow X direction in Figure 1). As a result, a more stable vibration test of the slip table 12 can be performed. When the slip table 12 is rotated to change the vibration direction of the test specimen 66, the additional connecting block 22 on the side further away from the vibration table 18 can be moved in a direction further away from the slip table 12 along the guide member 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 test specimen 66 can be changed easily and smoothly.

[0064] Furthermore, in the above-described embodiment, an example was shown in which four first fluid supply units 40a and eight second fluid supply units 40b and eight third fluid supply units 42a are formed. The number of first fluid supply units 40a, second fluid supply units 40b, and third fluid supply units 42a can be increased or decreased as appropriate, as long as the first fluid film 44a, second fluid film 44b, and third fluid film 44c can be formed uniformly over a wide area. The arrangement pattern can also be changed as appropriate, and the same effects as in this embodiment can be obtained.

[0065] While embodiments and variations of the present invention have been described, these embodiments and variations are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0066] 10...Vibration generating device, 12...Slip table, 12a...Mounting surface, 14...Vibration generating section, 22...Connecting block, 24...Fluid recycling section, 26...Fixing 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...Protruding part, 36 ...opening, 40...first flow path, 40a...first fluid supply section, 40b...second fluid supply section, 42...second flow path, 42a...third fluid supply section, 44a...first fluid film, 44b...second fluid film, 44c...third fluid film, 46...pocket, 46a...land, 66...test specimen, 70...rotating guide section, 70a...rotating gear, 72...resistance generating section, 72a...contact, 74...gear, 74a...notch.

Claims

1. A plate-shaped vibration table that is detachable from a vibration generating unit that generates vibration in a first direction, and on which the test specimen to be subjected to vibration testing can be fixed to the mounting surface, A plate-shaped first base plate is provided, having a projection on its first surface that is fixed to a substantially flat sliding surface on the opposite side of the aforementioned mounting surface of the vibrating table, and is slidable in the first direction and rotatable around the projection, A flat, plate-shaped second base plate is provided interposed between the vibrating table and the first base plate, having 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 protruding portion is inserted. A third base plate having a fifth surface opposite to the second surface on the opposite side of the first surface, and cooperating with the second base plate to slidably support the first base plate, A guide member that guides the vibrating table in the first direction, Equipped with, The second base plate includes a first fluid supply unit that sprays 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 sprays 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 fluid onto the second surface and forms a third fluid film between the fifth surface and the second surface. Vibration generating device.

2. The vibration generating device according to claim 1, wherein the guide member is a linear guide.

3. The vibration generating device according to claim 1, wherein the second fluid supply unit and the third fluid supply unit are formed in multiple equal intervals within the sliding range of the first base plate and are surrounded by lands of uniform height.

4. The vibration generating device according to any one of claims 1 to 3, wherein the protruding portion is cylindrical in shape, and a gap greater than or equal to the vibration stroke of the vibration generating portion is formed between the inner wall surface of the opening and the outer circumferential surface of the protruding portion.

5. The vibration generating device according to claim 1, wherein the vibration table is provided with a plurality of fixed blocks on its outer edge that can move toward and away from the connecting block of the vibration generating unit.

6. The vibration generating device according to claim 1, wherein the fluid is oil that can be circulated between the device and the drain pan.

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