JPH0255730B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a vibration testing machine for vibration testing a specimen.

(b) Prior Art A vibration tester in which a specimen 1 is supported on a table 2 as shown in FIG. 2 is generally used. The table 2 is guided by a guide 3 and can reciprocate rightward and leftward. In this test machine, a table 2 is caused to reciprocate by a double-acting hydraulic actuator 4, and the hydraulic actuator 4 is arranged on the right side of the table 2. As is well known, the double acting hydraulic actuator 4 has a cylinder 5, a piston 6, a piston rod 7 and a servo valve 8.
The piston 6 is fitted into the inner peripheral surface 9 of the cylinder 5,
The piston rod 7 has a pair of through holes 10 in the cylinder 5.
mated to. Then, the cylinder 5 is connected to the reaction force frame 11
The piston rod 7 is connected to the table 2. Therefore, when hydraulic pressure is supplied to the hydraulic chamber 12R on the right side of the piston 6 by the servo valve 8, the table 2 is pushed by the piston 6 and the piston rod 7, and the table 2 is moved leftward. The piston 6 slides along the inner peripheral surface 9 of the cylinder 5, and the piston rod 7 slides within the through hole 10 of the cylinder 5. On the contrary, when hydraulic pressure is supplied to the left hydraulic chamber 12R of the piston 6,
The table 2 is pulled by the piston 6 and the piston rod 7, and the table 2 moves to the right. This is repeated one after another. Therefore, the table 2 can be reciprocated leftward and rightward. Therefore, the specimen 1 vibrates integrally with the table 2, and the specimen 1 can be subjected to a vibration test.

However, in this testing machine, the inner circumferential surface 9 of the cylinder 5 needs to be precisely machined so that the piston 6 of the hydraulic actuator 4 slides smoothly. Furthermore, each through hole 10 of the cylinder 5 must be precisely machined so that the piston rod 7 can slide smoothly. Therefore, there was a problem of high cost. Furthermore, in order to increase the stroke of the table 2, that is, the stroke of the piston 6, it is necessary to increase the length of the inner circumferential surface 9 of the cylinder 5. However, it is not easy to precisely machine the long inner peripheral surface 9 of the cylinder 5. The long inner circumferential surface 9 cannot be precisely machined, and the stroke of the table 2 may be limited. In addition, hydraulic pressure is supplied to each hydraulic chamber 12L, 12R of the hydraulic actuator 4,
It is necessary to push the table 2 with the piston rod 7 and pull the table 2 with the piston rod 7, but if this is repeated one after another, it is inevitable that so-called play will occur between the table 2 and the piston rod 7. .

(C) Purpose Therefore, the present invention provides a vibration testing machine that vibrates a specimen by reciprocating a table, and provides a vibration tester that reduces the cost, increases the stroke of the table, and prevents rattling. It was done with the purpose of

(d) Configuration The present invention uses a single-acting hydraulic actuator in place of the conventional double-acting hydraulic actuator. A single-acting hydraulic actuator is provided on one side of the table that supports the specimen, and an elastic biasing means is provided on the other side of the table. Further, the hydraulic actuator and the biasing means are arranged opposite to each other and each connected to the table. The present invention is characterized in that the table is caused to reciprocate using a hydraulic actuator and elastic urging means.

(E) Examples Examples of the present invention will be described below. FIG. 1 shows an embodiment of the invention. The specimen 1 is supported by a table 2, and the table 2 is guided by a guide 3, as in the case of FIG.

Furthermore, a single-acting hydraulic actuator 13R is used in place of the double-acting hydraulic actuator 4 in FIG.
This hydraulic actuator 13R is provided on the right side of the table 2. Single acting hydraulic actuator 1
3R consists of a cylinder 14R, a ram 15R, and a servo valve 16, and the cylinder 14R has an inner peripheral surface 17 of a constant diameter and is fixed to a reaction frame 18. The ram 15R is fitted into a single through hole 19 of the cylinder 14R and connected to the table 2. The servo valve 16 is connected to the hydraulic chamber 20R of the cylinder 14R and the pump 2.
1 and tank 22.

In this embodiment, a single-acting hydraulic actuator 13L and a hydraulic accumulator 23 are used as elastic biasing means, and the hydraulic actuator 13L and the hydraulic accumulator 23 are provided on the left side of the table 2. Right hydraulic actuator 13
Like R, this hydraulic actuator 13R also has a cylinder 14R and a ram 15R, and each hydraulic actuator 13L, 13R is arranged on the same axis so as to face each other. And cylinder 1
4L is fixed to the reaction frame 18, and the ram 15L is fitted into a single through hole 19 of the cylinder 14L and connected to the table 2. Hydraulic accumulator 23
has a gas bag 24 filled with gas, and is connected to the hydraulic chamber 20L of the cylinder 14L.

In the vibration tester configured as described above,
When hydraulic pressure is supplied to the hydraulic chamber 20R of the hydraulic actuator 13R by the pump 21 and the servo valve 16, the table 2 is pushed by the ram 15R. Then, the gas bag 24 of the hydraulic accumulator 23 contracts, and the hydraulic pressure in the hydraulic chamber 20L of the hydraulic actuator 13L is absorbed into the hydraulic accumulator 23. Therefore, the table 2 is guided by the guide 3 and moves to the left. Ram 15L, 15R of each hydraulic actuator 13L, 13R
slides in the through holes 19 of the cylinders 14L and 14R, and moves integrally with the table 2. Conversely,
When the hydraulic pressure in the hydraulic chamber 20R of the hydraulic actuator 13R is discharged to the tank 22, the gas bag 24 of the hydraulic accumulator 23 expands, and the hydraulic accumulator 23 supplies hydraulic pressure to the hydraulic chamber 20L of the hydraulic actuator 13L. Therefore, the table 2 is pushed by the ram 15L, and the table 2 moves to the right. This is repeated one after another. Therefore, the table 2 is reciprocated leftward and rightward, thereby making it possible to perform a vibration test on the specimen 1.

Therefore, in this testing machine, it is only necessary to precisely machine the single through hole 19 of the cylinders 14L, 14R so that the rams 15L, 15R of the single-acting hydraulic actuators 13L, 13R slide smoothly.
There is no need to precisely machine the inner peripheral surfaces 17 of the cylinders 14L and 14R. Therefore, costs can be reduced. The inner circumferential surfaces 17 of the cylinders 14L and 14R may be formed by ordinary machining rather than precision machining. Furthermore, in order to increase the stroke of the table 2, it is necessary to lengthen the inner circumferential surfaces 17 of the cylinders 14L and 14R, but it is easy to form the long inner circumferential surfaces 17 by ordinary machining. Therefore, the stroke of the table 2 can be made longer. Furthermore, this test machine has a hydraulic actuator 13 on the right side.
The table 2 is pushed by the ram 15R of R, the table 2 is pushed by the ram 15L of the left hydraulic actuator 13L, and this is simply repeated. Unlike the conventional method, there is no effect of pulling the table 2. Therefore, no backlash occurs between the table 2 and the rams 15L, 15R.

Note that in this embodiment, the hydraulic actuator 1
Although the table 2 is elastically biased to the right by the hydraulic accumulator 3L and the hydraulic accumulator 23, other elastic biasing means, such as a compression spring, is provided on the left side of the table 2. The table 2 may be elastically biased to the right by this compression spring. In short, the single acting hydraulic actuator 13R is provided on one side of the table 2, and the elastic biasing means is provided on the other side of the table 2. Then, by arranging the hydraulic actuator 13R and the elastic biasing means to face each other and connecting them to the table 2, the table 2 can be reciprocated in the leftward and rightward directions, and similar effects can be obtained. It is something.

(f) Effects As explained above, the present invention uses a single-acting hydraulic actuator in place of the conventional double-acting hydraulic actuator, and uses the single-acting hydraulic actuator and elastic biasing means to cause the table to reciprocate. Therefore, costs can be reduced.
Furthermore, the stroke of the table can be increased to prevent backlash.
It is possible to achieve the intended purpose.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a conventional vibration testing machine. 1... Specimen, 2... Table, 13L, 13
R...Single acting hydraulic actuator, 23...Hydraulic accumulator.

Claims (1)

[Claims] 1. In a testing machine in which a specimen is supported on a table guided in a reciprocating manner and the table is moved reciprocally to perform a vibration test on the specimen, a single-acting hydraulic actuator is provided on one side of the table; An elastic biasing means is provided on the other side of the table, and the hydraulic actuator and the elastic biasing means are arranged to face each other and are respectively connected to the table, so that the table is reciprocated by the hydraulic actuator and the elastic biasing means. A vibration testing machine characterized by being made to move.