JPS6130208B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotation prevention device for a hydrostatic joint for power transmission used in a vibration testing machine or the like.

[Prior art]

FIGS. 5 and 6 show the configuration of a vibration testing machine known from Japanese Patent Application Laid-open No. 54-104866.

In the figure, 1 is a foundation, 2 is a vibration table, 3 is a vibration exciter for horizontal direction X, 4 is a vibration exciter for vertical direction Z,
5 is a side guide device of the vibration table 2. The piston rod 3a of the horizontal vibration exciter 3 and the piston rod 4a of the vertical vibration exciter 4 are each connected to the vibration table 2 by a static pressure joint 6. This static pressure joint 6 is a fork 6 fixed to the vibration table 2.
a and a bracket 6 which is connected to the piston rods 3a and 4a of the vibrator 3 and 4 and which holds the fork in between.
It consists of b.

Now, when the vibrator 3 for horizontal direction X reciprocates, this reciprocating motion is transmitted to the vibration table 2 through the static pressure joint 6. At this time, the vibration exciter 4 for vertical direction Z
The side static pressure joint 6 allows the vibration table 2 to move in the X direction. Furthermore, when the vertical direction Z vibration exciter 4 reciprocates, this reciprocating motion is transmitted to the vibration table 2 through the static pressure joint 6.
is transmitted to. At this time, the static pressure joint 6 on the side of the vibrator 3 for the horizontal direction X allows the vibration table 2 to move in the Z direction.

In this type of static pressure joint 6, for convenience of explanation,
The operation of the static pressure joint 6 provided on the side of the vibration exciter 4 for the vertical direction Z will be explained with reference to FIGS. 7 and 8.
When the piston rod 4a of the vibrator 4 reciprocates, rotational movement may occur in the piston. When the piston rotates in this manner, the bracket 6b connected to the piston rod 4a rotates about the axis O of the piston rod 4a in the direction indicated by arrow A, as shown in FIG. In order to prevent such rotation in the counterclockwise or counterclockwise direction (repeatedly changing from clockwise to counterclockwise or vice versa), in the past, two plates opposing the sides of the bracket 6b were used. The stop members 7a and 7b of the shape are attached to the fork 6a with a support bracket 7c.
Fixed via.

These stopper members 7a and 7b are similarly provided on the static pressure joint 6 on the side of the horizontal vibration exciter 3.

[Problem that the invention seeks to solve]

In the rotation prevention means using the stopper members 7a and 7b, when the vibration table 2 is moved in the X direction and the Z direction by the horizontal vibration exciter 3 and the vertical vibration exciter 4, the bracket 6b is rotated clockwise, for example. When the first stopper member 7b rotates, one of the stopper members 7b reciprocates while sliding on the sides of the vibrators 3 and 6b, so the frictional force due to the sliding between the stopper member 7b and the bracket 6b increases.

Further, when the direction of rotation of the bracket 6b changes, that is, when the bracket 6b changes from, for example, a clockwise direction to a counterclockwise direction, the bracket 6b collides from one stopper member 7b to the other stopper member 7a. impact force is generated.
For this reason, the vibration acceleration waveform for controlling the vibration table is distorted, resulting in a disadvantage that the control accuracy is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a rotation prevention device for a static pressure joint that prevents the vibration acceleration waveform for controlling a vibration table from becoming distorted.

[Means for solving problems]

To achieve the above object, the present invention provides a static pressure joint comprising a fork fixed to a vibration table and a bracket connected to a piston rod of a vibrating machine and sandwiching the fork. A plurality of levers are provided which vibrate toward the bracket, rollers are attached to the tips of these levers to contact the side surfaces of the bracket, and spring members for pressing the rollers are provided on the levers.

[Effect]

According to the above structure, rotation of the bracket can be prevented with less frictional force by using rollers attached to a plurality of levers at the portions of the static pressure joint that contact the side surfaces of the bracket. Furthermore, by providing the lever with a spring member for pressing the roller, it is possible to reduce the impact in the event of a collision. This prevents the vibration acceleration waveform that controls the vibration table from becoming distorted, and allows the vibration table to be controlled with high performance.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show an example of the anti-rotation device of the present invention installed in a static pressure joint on the side of a vertical vibration exciter.
Components with the same symbols as in FIG. 8 are the same parts. The fork 6a of the static pressure joint 6 is provided with a rotation prevention device 8 for preventing rotation of the bracket 6b.

Further, FIGS. 3 and 4 show the detailed structure of the rotation prevention device 8. As shown in FIG. The anti-rotation device 8 consists of a support bracket 9 attached to the fork 6a, two fixed plates 10 fixed to the ends of the support bracket 9, and a
A lever 12 is swingably attached to the side surface of the bracket 6b via a pin 11 parallel to the Z direction, and a lever 12 is rotatably attached to the tip of the lever 12 via a pin 13 parallel to the Z direction. 2
One end of the roller 14 is fixed to the lever 12 by a bolt 16, and the other end is bent at approximately 90 degrees and is arranged so as to contact the fixed plate 10, and the roller 14 is fixed to the lever 12 with a bolt 16.
It is composed of a spring member 15 for pressing against the side surface of b.

The fixing of the spring member 15 may be configured in a manner opposite to that described above.

Next, the operation of the device of the present invention will be explained. When the vibration table 2 moves in the X direction, the fork 6a in the static pressure joint 6 on the side of the vertical vibrator 4 moves in a direction perpendicular to the plane of the paper in Fig. 3, and in a direction parallel to the plane of the paper in Fig. 4. do. At this time, one roller 14 of the rotation prevention device 8 rotates back and forth along the side surface of the bracket 6b while suppressing the rotation of the bracket 6b. For this reason, the anti-rotation device 8
The rotation smoothly guides the bracket 6b.
Further, for example, if the direction of rotation of the bracket 6b changes from the above-mentioned direction, the bracket 6b collides with the other roller of the rotation prevention device 8, but this collision is alleviated by the spring member 15.

Although the above-mentioned operation is about preventing the rotation of the static pressure joint 6 on the side of the vibration exciter 4 in the vertical direction, the rotation of the bracket 6b can be similarly prevented in the static pressure joint 6 on the side of the vibration exciter 3 in the horizontal direction. I can do it.

In addition, although the above-mentioned embodiment explained the case where the vibration table is vibrated in two-dimensional directions of X and Z, it can be implemented in the same way for static pressure joints of one-dimensional and three-dimensional vibration tables.

〔Effect of the invention〕

As detailed above, since the rotation prevention device of the present invention uses rollers in the contact portion of the static pressure joint with the side surface of the bracket, friction is reduced, and the shock in the event of a collision is alleviated by the spring member. Therefore, it is possible to prevent the vibration acceleration waveform for controlling the vibration table from becoming distorted. As a result, the vibration table can be controlled with high performance.

[Brief explanation of the drawing]

FIG. 1 is a front view of a static pressure joint equipped with an example of the rotation prevention device of the present invention, FIG. 2 is a left side view of FIG. 1,
Fig. 3 is an enlarged side view of an example of the anti-rotation device of the present invention, Fig. 4 is a view taken from the - line in Fig. 3, and Fig. 5 is a two-dimensional vibration The plan view of the stand, Figure 6 is the front view of Figure 5, and Figure 7 is the front view of the stand.
The figure is a front view of a static pressure joint equipped with a conventional anti-rotation device, and FIG. 8 is a left side view of FIG. 7. 2... Vibration table, 3... Horizontal vibration exciter, 4
... Vertical vibration exciter, 6 ... Static pressure joint, 6a
...Fork forming the static pressure joint 6, 6b...Bracket forming the static pressure joint 6, 8...Rotation prevention device, 9...Support bracket, 10...Fixing plate, 11...Pin, 12... Lever, 13...
Pin, 14... roller, 15... spring member.

Claims (1)

[Claims] 1. In a static pressure joint consisting of a fork fixed to a vibration table and a bracket connected to a piston rod of a vibrator and sandwiching the fork, the fork is provided with a plurality of levers that vibrate toward the side surface of the bracket. A rotation prevention device for a static pressure joint, characterized in that rollers that contact the side surfaces of the bracket are respectively attached to the tips of these levers, and a spring member for pressing the rollers is provided on the levers.