JPS6111372B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration tester that applies vibration in three-dimensional directions (X-axis, Y-axis, and Z-axis directions) to a small component that is subject to low-cycle vibration and observes its vibration resistance.

Three-dimensional vibration testing machines can be roughly divided into two types: those using a universal joint system for low frequencies, and those using a hydrostatic bearing system for high frequencies.

FIG. 1 shows an outline of a three-dimensional vibration testing machine using a universal joint method, in which vibrations are generated in the X-axis, Y-axis, and Z-axis directions on the outer periphery of a vibration table 15 via universal joints, etc. direct-acting actuator 16 for each axis,
17, 18 each piston rod 19, 20, 21
was connected.

Therefore, there is a drawback that the space occupied by the entire testing machine is larger than the size of the vibration table 15, and the piston of each axis actuator requires a universal joint or the like as a relief against displacement of the vibration table in each axis direction. Therefore, there was a drawback that vibration transmission to the vibration table lacked smoothness. Furthermore, there is a three-dimensional vibration tester using a hydrostatic bearing method, which is described in Japanese Patent Application Laid-Open No. 52-22940.

However, in this three-dimensional vibration tester, the piston rod of the X-direction vibrator body is fixed to a support frame fixed to the vibration table, and the piston rod of the Y-direction vibrator body is fixed to a support frame fixed to the X-direction vibrator. The piston rods of the Z-direction vibrator fixed to the fixed part are each fixed to the Y-direction vibrator body, and around the X-direction vibrator body, a static pressure bearing that restrains displacement in the X direction is connected to the fixed part. A static pressure bearing is provided between the support frame and the Y-direction vibration exciter support frame, and a static pressure bearing is provided between the support frame and the Y-direction displacement. Around the main body of the directional vibration exciter, a static pressure bearing that restrains displacement in the Y direction is installed between it and the fixed part, and a static pressure bearing that follows displacement in the Z direction is installed in its support frame. .

Therefore, the guide mechanism using static pressure bearings for each of the vibrators in the X direction and the Y direction is extremely complicated, resulting in the disadvantage that the overall structure of the vibration tester becomes complicated and large.

In view of the above points, the present invention reduces the space occupied by the entire vibration testing machine by equipping each axis actuator, especially the X-axis and Y-axis actuators below the vibration table, and also enables vibration transmission to the vibration table. The technical challenge is to facilitate this process, and its main components are as follows.

(a) The X-axis and Y-axis actuators are mounted and fixed on top of the Z-axis actuator in a perpendicular state.

(b) The vibration table is slidably supported by a hydrostatic bearing on the top surface of the X-axis actuator.

(c) A pair of guide frames are provided on the lower surfaces of opposite sides of the vibration table, and piston rod ends protruding from both ends of each actuator are provided on the opposing surfaces of each guide frame facing each actuator of the X and Y axes. A groove for loose insertion is formed in the longitudinal direction of each guide frame.

Therefore, when applying vibration in the Z-axis direction,
The vibrations of the Y-axis and X-axis actuators accompanying the vibrations of the Z-axis actuator are transmitted to the vibration table via each piston rod and each guide frame into which the rod end is loosely inserted.

In addition, when applying vibration in the X-axis or Y-axis direction, the vibration of the piston rod of the actuator is transmitted to the vibration table via the guide frame facing the actuator, and at this time, the piston rod of the inactive actuator is transferred to the vibration table. Slide in the groove of the guide frame facing the.

Next, examples of the present invention will be described.

In FIGS. 2 and 3, 2 is a Z-axis direct-acting actuator fixed on an absolutely stationary surface 1, and a Y-axis direct-acting actuator is connected to the end of a piston rod 3 of the actuator 2 via a head 4. 5 is attached, and an X-axis direct-acting actuator 7 is mounted and fixed perpendicular to the actuator 5.

Reference numeral 13 denotes a vibration table that is slidable in the X-axis and Y-axis directions with respect to the upper surface of the X-axis actuator 7 via a static pressure bearing 14, and the lower surfaces of the four sides of the vibration table 13 are provided with both ends of the X-axis actuator 7. A pair of guide frames 9, 9 are attached to face the piston rods 8, 8 that protrude further, and the piston rods 6, 6 protrude from both ends of the Y-axis actuator 5.
A pair of guide frames 11, 11 are attached to face each other.

Grooves 10, 10, 12,
12 are formed, and the respective ends of the piston rods 8, 8 of the X-axis actuator 7 are loosely inserted into the grooves 10, 10, and the respective ends of the piston rods 6, 6 of the Y-axis actuator 5 are loosely inserted into the grooves 12, 12, respectively. ing.

Control of each axis actuator (for example,
(Feedback control of the opening and closing of the hydraulic servo valve of the actuator to regulate the stroke and cycle of the piston rod) is no different from conventional vibration testing machines.

When the Z-axis actuator 2 is activated and the X-axis and Y-axis actuators 5 and 7 are not activated, the Y-axis that accompanies the vibration of the Z-axis actuator 2
The vibrations of the shaft and X-axis actuators 5, 7 are transmitted to a vibration table 13 supported by a hydrostatic bearing 14 via their respective piston rods 6, 8 and respective guide frames 9, 11 into which the ends of the rods are loosely inserted.

On the other hand, the Z-axis actuator 2 is inoperative, and the Y-axis
When either the X-axis actuator 5 or 7 is in operation, the piston rod end of the actuator presses against the guide frame facing the actuator and the pressure is transmitted to the vibration table via the static pressure bearing 14. The piston rod end of the actuator slides in a groove in a guide frame facing the actuator.

As described above, in the present invention, the X-axis and Y-axis actuators are arranged inside two sets of guide frames (forming a rectangular shape as a whole) attached to the lower surface of the four sides of the vibration table. The total space occupied is the same as the space occupied by the vibration table, and the X-axis and Y-axis actuators are arranged around the outer periphery of the vibration table as in the conventional universal joint system, and the complex guide mechanism of the hydrostatic bearing type is used. The space occupied by the testing machine can be greatly reduced and the size of the testing machine can be made smaller compared to those with a

In addition, since the sliding surface between the top surface of the X-axis actuator and the vibration table forms a static pressure bearing, the operation of the X-axis and Y-axis actuators is extremely smoothly transmitted to the vibration table without increasing starting friction or low-speed friction. It has a possible effect.

Furthermore, when either the X-axis or Y-axis actuator is actuated, the piston rod end of the actuating actuator presses the guide frame facing the actuator and transmits vibration to the vibration table. Since the end of the piston rod slides in the groove of the guide frame facing the actuator, it has the advantage of simplifying the structure without requiring the complicated guide mechanism of conventional universal joints and numerous hydrostatic bearings. be.

In the embodiment, a Y-axis actuator is placed on the Z-axis actuator, and an X-axis actuator is placed on the Y-axis actuator.
Although the axis actuators are shown stacked and fixed, it goes without saying that the arrangement of the X-axis and Y-axis actuators can be reversed.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of a conventional three-dimensional vibration testing machine.
FIG. 2 is a partially cutaway perspective view of an embodiment of the present invention (excluding the vibration table), and FIG. 3 is a sectional view taken along the line -- (including the vibration table) in FIG. 2... Z-axis direct-acting actuator, 5... Y-axis direct-acting actuator, 7... X-axis direct-acting actuator, 9, 11... Guide frame, 10, 12...
...Groove into which the end of the piston rod is loosely inserted, 13...
Vibration table, 14...static pressure bearing surface.

Claims (1)

[Claims] 1 The X-axis and Y-axis direct-acting actuators are placed and fixed in an orthogonal state on the piston rod of the Z-axis direct-acting actuator, and the opposite side of the vibration table is made slidable by a hydrostatic bearing with respect to the X-axis actuator. A pair of guide frames are respectively attached to the lower surface, and the piston rod ends of the X-axis and Y-axis actuators are inserted into the opposing surfaces of the respective guide frames, and when either the X-axis or Y-axis actuator is operated, The end of the piston rod of the actuating actuator presses a pair of guide frames facing the rod to displace the vibration table, and the end of the piston rod of the non-actuating actuator, which is perpendicular to this, slides the pair of guide frames facing the rod. A three-dimensional vibration testing machine characterized in that a groove is formed in the longitudinal direction of the guide frame.