JP3959316B2 - Shaking table device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of shaking table devices used for vibration tests, earthquake resistance tests, etc. of structures or structural members.
[0002]
[Prior art]
Conventionally, as a technique related to a shaking table device, for example, Japanese Patent Publication No. 5-10156 discloses a two-way vibrator using a hydrostatic bearing and simultaneously vibrating in two horizontal and two vertical directions. ing.
[0003]
Japanese Laid-Open Patent Publication No. 9-250965 discloses a vibration exciter that transmits an excitation force from the exciter using a link joint.
[0004]
Japanese Patent Laid-Open No. 2001-83035 discloses a vibration exciter in which a total of eight vibration means are arranged in two orthogonal four directions with respect to the vibration table and are connected to the vibration table via a hydrostatic joint. ing.
[0005]
[Problems to be solved by the present invention]
As described above, various types of shaking table devices have been developed and used. However, all of the conventional shaking table devices use hydrostatic bearings as a means to ensure necessary and sufficient reaction force against moments such as rocking and yawing generated from the excitation reaction force of the DUT mounted on the vibration table. In addition to the use of link joints and hydrostatic joints, and the use of multiple vibrators in each direction, extremely complex and expensive structures, mechanisms, parts, etc. are used. Nevertheless, the performance and quality are not so good.
[0006]
Recent economic circumstances also indicate that it is desirable that the types of test equipment be as cheap as possible.
[0007]
An object of the present invention is to provide a shaking table device that is simple in structure but has high performance and is inexpensive.
[0008]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems of the prior art, the shaking table device according to the invention described in claim 1 is:
At least two pairs of linear motion block mechanisms that move in one horizontal direction are installed on the upper surface of the foundation frame, and the intermediate frame thereon is supported by the linear motion block mechanism,
At least two pairs of linear motion block mechanisms that move in one horizontal direction orthogonal to the horizontal one direction are installed on the upper surface of the intermediate frame, and the vibration table thereon is supported by the linear motion block mechanism,
The at least two pairs of linear motion block mechanisms on the foundation frame and the at least two pairs of linear motion block mechanisms on the intermediate frame have the same arrangement in plan view;
One vibration actuator that operates in the same two orthogonal directions as each of the linear motion block mechanisms is arranged in the horizontal direction with respect to the vibration table, and each actuator and vibration table is an operation of the actuator. It is connected through a linear motion block mechanism arranged in a horizontal direction orthogonal to the direction.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a shaking table device according to the invention described in claim 1 will be described based on the drawings.
[0010]
1 and 2 show an embodiment of a shaking table device according to the present invention, and FIG. 3 shows a base frame 2 and a linear motion block mechanism 3 and an intermediate frame 4 and a linear motion block mechanism 5 constituting the vibration table device. In addition, the relative arrangement of the vibration table 6 is shown in an exploded state.
[0011]
At least two pairs of linear motion block mechanisms 3 moving in one horizontal direction (arrow a⇔b direction) are installed on the upper surface of the foundation frame 2 fixed on the floor 1 as shown in FIG. The intermediate block 4 is supported horizontally by the linear motion block mechanism 3.
[0012]
Further, as shown in FIG. 3, the upper surface of the intermediate mount 4 is in one direction (arrow c⇔d direction) orthogonal to one horizontal direction in which the linear motion block mechanism 3 on the base mount 2 moves. At least two pairs of moving linear motion block mechanisms 5 are installed, and the linear motion block mechanism 5 supports the vibration table 6 thereon. Reference numeral 7 in FIG. 1 indicates a test object placed on the vibration table 6.
[0013]
As apparent from FIG. 3, the two pairs of linear motion block mechanisms 3, 3 disposed on the foundation frame 2 and the two pairs of linear motion block mechanisms 5, 5 disposed on the intermediate frame 4 are These are characterized by having the same arrangement in plan view. It is considered that at least two pairs (a total of four on the plane) of the linear motion block mechanisms 3 or 5 at each stage are necessary as a condition for supporting the vibration table 6 in a stable horizontal posture.
[0014]
As is apparent from FIG. 2, the vibration table 6 operates in the same two orthogonal directions (directions of arrows a⇔b and c 矢 印 d in FIG. 3) as the linear motion block mechanisms 3 and 5 described above. Each of the vibration actuators 8 and 9 is arranged horizontally in the center of two right-angle sides of the vibration table 6 having a square shape as shown in FIG. 2, and each is a reaction force fixed to the floor 1. The base end is supported by the cradle 10.
[0015]
The output shafts 8a, 9a of the actuators 8, 9 and the vibration table 6 are connected via linear motion block mechanisms 11, 12 arranged in a horizontal direction orthogonal to the operation direction of the actuators 8 or 9. Thus, the excitation force in two orthogonal directions can be transmitted to the vibration table 6.
[0016]
FIG. 4 shows an example of the specific configuration of the linear motion block mechanisms 3 and 5 described above.
[0017]
The linear motion block mechanisms 3 and 5 are basically low-friction linear motion mechanisms applying a ball bearing mechanism, which are known and well-known techniques disclosed in, for example, Japanese Patent Publication No. 7-18448 and Japanese Patent Publication No. 8-18209. It is a combination of a guide rail 20 and a slider block 21 that moves along the guide rail 20. A large number of balls 22 are accommodated and held in a ball groove of the slider block 21 in a daisy chain. As the slider block 21 moves, the ball 22 rolls to realize a low-friction and stable linear movement.
[0018]
In the embodiment shown in FIGS. 1 to 3, in the case of the linear motion block mechanism 3, the guide rail 20 is fixed to the foundation frame 2, and the slider block 21 is joined to and supported by the intermediate frame 4. Further, the linear motion block mechanism 5 shows an embodiment in which the slider block 21 is fixed to the intermediate frame 4 and the guide rail 20 is fixed to and supported by the vibration table 6.
[0019]
In the case of the linear motion block mechanisms 11 and 12 that connect the vibration actuators 8 and 9 arranged one by one in two directions at right angles to the vibration table 6, the guide rail 20 is fixed to the side surface of the vibration table 6. The slider block 21 is connected to the output shafts 8a and 9a through a common support plate 25 as a set of two slider blocks 21 spaced apart from each other. Therefore, the reaction force orthogonal to the vibration direction by each vibration actuator 8 or 9 is absorbed and relaxed by the linear motion block mechanism in the same direction, and the reaction force is not generated or transmitted.
[0020]
On the other hand, the moments such as rocking and yawing generated from the vibration reaction force of the DUT 7 can be obtained as a necessary and sufficient reaction force by the linear motion block mechanism on the side arranged relatively away from each other. As a result, the moment is transmitted to the foundation frame 2 in a plane, so that no reaction force is transmitted to the vibration actuator 8 or 9.
[0021]
Regarding the vertical load, the two pairs of linear motion block mechanisms 3 and 3 on the base frame 2 and the two pairs of linear motion block mechanisms 5 and 5 on the intermediate frame 4 are arranged at the same position in plan view. Therefore, it is directly transmitted between the upper and lower linear motion block mechanisms, and no moment is generated in the intermediate mount 4 due to horizontal movement.
[0022]
Eventually, the vibration actuators 8 and 9 are arranged one by one on two right-angle sides of the vibration table 6, so that a two-way vibration table device can be constructed, which is extremely simple compared to the conventional methods and devices. A structure and an inexpensive shaking table device can be provided.
[0023]
[Effects of the present invention]
The vibration table device according to the first aspect of the present invention is simple in structure, but has high performance and is very inexpensive, and therefore has a very high practical value.
[Brief description of the drawings]
FIG. 1 is a front view of a shaking table device according to the present invention.
FIG. 2 is a plan view of the previous shaking table device.
FIG. 3 is an exploded plan view showing the main part of the shaking table device.
FIG. 4A is a perspective view showing an example of a linear motion block mechanism with a part broken away, and FIG. 4B is a cross-sectional view of the same.
[Explanation of symbols]
2 Foundation frame 3 Linear motion block mechanism 4 Intermediate frame 5 Linear motion block mechanism 6 Vibration table 8, 9 Actuator 11 and 12 for vibration Linear motion block mechanism

Claims (1)

At least two pairs of linear motion block mechanisms that move in one horizontal direction are installed on the upper surface of the foundation frame, and the intermediate frame thereon is supported by the linear motion block mechanism,
At least two pairs of linear motion block mechanisms that move in one horizontal direction orthogonal to the horizontal one direction are installed on the upper surface of the intermediate frame, and the vibration table thereon is supported by the linear motion block mechanism,
The at least two pairs of linear motion block mechanisms on the foundation frame and the at least two pairs of linear motion block mechanisms on the intermediate frame have the same arrangement in plan view;
One vibration actuator that operates in the same two orthogonal directions as each of the linear motion block mechanisms is arranged in the horizontal direction with respect to the vibration table, and each actuator and vibration table is an operation of the actuator. The vibration table device is connected through a linear motion block mechanism arranged in a horizontal direction orthogonal to the direction.

Images