JP5671272B2 - Excitation device - Google Patents

Description

  The present invention relates to a vibration device, and more particularly to improvement of a vibration device using fluid pressure suitable for a durability test on a specimen.

  Various proposals have conventionally been made as fluid pressure-based vibration devices suitable for endurance tests on specimens. Among them, for example, in the proposal disclosed in Patent Document 1, there is stability in a vibration device. Is guaranteed.

  That is, in the vibration device disclosed in Patent Document 1, the frame body standing on the floor surface has a horizontal portion, and the horizontal portion has a vibration exciter. The specimen is supported under the arrangement of the jig.

  Therefore, in the proposal disclosed in Patent Document 1, even when the horizontal portion of the frame body vibrates due to the drive of the vibrator when the vibration device is used, the frame body stands on the floor surface or the like. Therefore, the stability of the vibration exciter is guaranteed.

Japanese Patent Publication No. 55-39768 (see Fig. 2)

  However, in the proposal disclosed in the above-mentioned Patent Document 1, there is basically no problem in terms of ensuring the stability of the vibration exciter, but it is pointed out that there is a slight problem in implementation. There is a possibility that.

  That is, as is well known, in the case of a vibration device of the kind of the kind, when the mass of the frame body is 10 times or more of the vibration force in the vibration exciter, vibration caused by the drive of the vibration exciter It is easy to ensure the stability of the vibration device without being affected.

  From this, even in the proposal disclosed in Patent Document 1 described above, the frame body is formed in a so-called large size so as to have a large mass, and as a result, a large installation area is required when installing the vibration exciter. Occurrence of problems such as occupying or worsening the transportability of the vibration exciter due to an increase in the overall mass is feared.

  The present invention was devised in view of such a current situation, and the object of the present invention is to exhibit a predetermined vibration function, as well as avoid the enlargement, and It is to provide a vibration exciter that is optimal for expecting improvement in versatility.

To achieve the above object, the configuration of the vibration device according to the present invention, basically, a shaker table for placing the specimen and a shaker for vibrating the shaker table in the vertical direction in vibrator comprising a frame member for holding the vibrator, the supporting portion is provided below the frame body, the elastic body between the frame body and the support portion is arranged while the center of gravity of the vibrator is formed by a lower center of gravity of the frame body.

  Therefore, in the present invention, since the support portion is provided below the frame body, the position of the center of gravity of the frame body having the support portion is increased.

  On the other hand, in the present invention, even if the frame body vibrates due to the drive of the vibrator, the center of gravity position of the vibrator is made lower than the center of gravity position of the frame body. The frame body is less likely to vibrate compared to the case where the center of gravity position of the vibrator is above the center of gravity position of the frame body.

  In the present invention, since the elastic body is disposed between the frame body and the support portion, it becomes possible not to transmit the vibration of the frame body to the support portion. Even if the vibration force is not more than 10 times the vibration force in the vibration exciter, it is easy to ensure the stability of the vibration apparatus without being affected by the vibration caused by the drive of the vibration exciter.

  As a result, according to the present invention, the frame body is not enlarged so as to have a large mass, there is no risk of occupying a large installation area when the vibration exciter is installed, and the entire weight is not increased. The transportability of the vibration device can be improved.

  By the way, in the present invention, it is possible to apply a static load by using a hydraulic exciter as compared with a case where the exciter is an electromagnetic type, and electromagnetic noise can be applied. The vibratory apparatus can be used without worrying about the effects of.

It is an elevation view which shows the vibration apparatus by one Embodiment of this invention. It is a figure which shows the vibration apparatus by other embodiment similarly to FIG. It is a figure which shows the vibration apparatus by other embodiment similarly to FIG.

  In the following, the present invention will be described based on the illustrated embodiment. As shown in FIG. 1, the vibration device according to the present invention is a vibration table 1 on which an arbitrary specimen (not shown) is placed. And a vibrator 2 that vibrates the vibration table 1 in the vertical direction, a frame body 3 that holds the vibrator 2, and a support portion 4 and an elastic body 5. It becomes.

  The vibration table 1 is placed in a fixed state while allowing the specimen to be separated. For example, the shaking table 1 has a disk shape and has a sufficient area to place the specimen and the specimen in a fixed state. It is formed so as to have a mechanical strength that can be placed and can withstand vibration from a vibrator 2 described later.

  The vibration exciter 1 is formed as a separate part from the exciter 2 to be described later and connected to the exciter 2, but this is integrally formed with the exciter 2 in advance. It may be a part of the vibrator 2.

  However, when the vibration table 1 is a part of the vibrator 2, a through hole 3a formed in the frame body 3 to be described later for inserting the vibration table 1 is formed to have a large diameter. Therefore, it cannot be said that it is preferable from the viewpoint of easily reducing the mechanical strength of the frame body 3.

  In addition, when the specimen is various in size, particularly when it is called a so-called large size, it is preferable that the vibration table 1 has a corresponding area, and so-called replacement may be required. In view of this, it is preferable that the vibrator 2 is formed as a separate part.

  Incidentally, the vibrating table 1 has a number of screw holes and through holes that allow a fixed connection of an appropriate jig, although not shown, for placing an arbitrary specimen in a fixed state on the upper surface thereof. Thus, it is preferable to allow the fixing bolt to be screwed into the screw hole and the fixing bolt to be inserted into the through hole.

  And the formation of a large number of screw holes and through-holes in the vibration table 1 realizes the weight reduction of the mass in the vibration table 1 as much as possible. In particular, in the present invention, as described later, In other words, it will be advantageous from the viewpoint of lowering the gravity center position of the vibrator 2 from the gravity center position on the frame body 3 side.

  In the present invention, the vibration exciter 2 is composed of a fluid pressure actuator, in particular, a fluid pressure cylinder. The fluid pressure cylinder, as shown in the figure, is provided so as to be able to appear and retract in the cylinder body 21. Rod body 22 to be formed.

  In this fluid pressure cylinder, the axial direction, that is, the protruding and retracting direction of the rod body 22 is the vertical direction, the cylinder body 21 is the lower end side member, and the rod body 22 is the upper end side member. .

  In the fluid pressure cylinder, a fluid pressure supply / discharge source (not shown) is connected to the cylinder body 21, and the fluid pressure from the fluid pressure supply / discharge source is applied to a pressure chamber (not shown) in the cylinder body 21. The rod body 22 appears and disappears with respect to the cylinder body 21 by being supplied and discharged.

  By the way, in this fluid pressure cylinder as the vibrator 2, the cylinder body 21, which is heavier than the rod body 22, is used as a lower end side member, and a head portion (not shown) in the cylinder body 21 is a bracket 23. In other words, it is connected to a state of being suspended on the lower surface of the frame body 3.

  Therefore, in this vibrator 2, the cylinder body 21, which is heavier than the rod body 22, is used as the lower end side member, so that the position of the center of gravity of the vibrator 1 is positioned downward in the vertical direction. It becomes possible to decide.

  As will be described in detail later, this makes it possible to make the position of the center of gravity of the vibrator 2 lower than at least the position of the center of gravity of the frame body 3.

  On the other hand, in the present invention, the exciter 2 is hydraulic. However, it can be said that the exciter 2 may be an electromagnetic exciter in terms of the excitation function.

  However, in the case of an electromagnetic vibrator, a static load cannot be applied to the specimen, and when load feedback control is performed as a fatigue test, the strain gauge lead wire serves as an antenna for electromagnetic excitation. There is a concern that the strong electromagnetic noise generated by the vibrator cannot be prevented.

  On the other hand, when the vibrator 2 is hydraulic, it is possible to apply a static load, and it is advantageous in that the vibration device can be used while eliminating the influence of electromagnetic noise. Become.

  The frame body 3 is shown in the figure, and includes a horizontal portion 31 that holds the above-described vibrator 2 on its lower surface, and a portal frame 32 that stands on the horizontal portion 31.

  And in this frame body 3, the horizontal part 31 comprises what is called a base part in this vibration apparatus, For this reason, for example, the disk shape similar to the above-mentioned vibration table 1, or others It has an upper surface which is formed in an arbitrary shape and has an arbitrary width, and in particular, it is considered that the specimen placed on the vibration table 1 does not protrude outward from the region of the upper surface of the base part. .

  Although not shown, the horizontal portion 31 also has a number of screw holes and through holes that allow a fixed connection of an appropriate jig, like the above-described vibration table 1. It is preferable to allow the fixing bolt to be screwed into the screw hole and the fixing bolt to be inserted into the through hole.

  Incidentally, the formation of a large number of screw holes and through holes in the horizontal portion 31 realizes a weight reduction as much as possible of the mass of the frame body 3. In particular, in the present invention, the center of gravity position on the frame body 3 side is realized. This is advantageous from the viewpoint of lowering the position of the center of gravity of the vibrator 2.

  The portal frame 32 is unnecessary when the vibration device is used as a so-called vibration device for performing a vibration test of a specimen, but when the vibration device is used as a fatigue testing device. It becomes indispensable as a reaction force element that holds the specimen fixedly between the vibrator 2 and the portal frame 32 is provided so that the vibrator 2 repeatedly applies a load to the specimen. It becomes possible.

  The portal frame 32 supports a load cell or the like that is held by a specimen when the vibration device is used as a fatigue tester, but the vibration device is used only as a vibration generator. Of course, as shown in FIG. 2, it may be removed from the horizontal portion 31.

  As described above, in the vibration device according to the present invention, the center of gravity of each of the vibrator 2 and the frame body 3 can be determined by having the vibrator 2 and the frame body 3 regardless of the vibration table 1. However, as described above, the vibrator 2 is provided on the lower surface side of the frame body 3, and the center of gravity of the vibrator 2 is positioned below the center of gravity of the frame body 3.

  Therefore, when the vibrator 2 is driven to vibrate the shaking table 1 in the vertical direction, the frame body 3 whose center of gravity is above the center of gravity of the vibrator 2 even if the frame body 3 vibrates. Compared to the case where the center of gravity is below the center of gravity of the vibrator 2, the situation is such that it cannot be vibrated easily.

  By the way, as is the case with the vibration device according to the present invention, in view of the fact that almost all kinds of vibration devices are used, it is natural that they are supported somewhere in their use. The vibration device according to the present invention has a support portion 4, and at this time, an elastic body 5 is provided between the support portion 4 and the frame body 3 described above.

  First, the support portion 4 is a leg portion or a base portion when the vibration device including the vibration table 1, the vibration device 2 and the frame body 3 is installed on the floor surface F, for example. Or

  That is, in the place shown in FIG. 1, the support portion 4 is composed of a support, and this support may be erected directly on the floor surface F as shown in FIG. 2, but this excitation is shown in FIG. In order to improve the transportability of the apparatus, it is erected on a support plate B which is a substrate.

  Incidentally, the support plate B is fixedly connected to the floor surface F by an appropriate means when the vibration exciter is used.

  On the other hand, although it is the elastic body 5, in the present invention, as described above, between the frame body 3 and the support portion 4, that is, in the drawing, the lower surface of the horizontal portion 31 and the support portion in the frame body 3. Provided between the upper end of the body 4.

  At this time, as the elastic body 5, an arbitrary configuration can be basically selected. For example, the elastic body 5 may be formed of an air spring, or may be formed of a metal spring such as a disc spring or a coil spring.

  Incidentally, when the elastic body 5 is made of a disc spring, it is advantageous in that a strong spring force can be expected while reducing the height dimension, compared to the case where the elastic body 5 is made of a coil spring.

  As described above, the elastic body 5 is provided between the support portion 4 and the frame body 3, and the position of the center of gravity of the vibrator 2 is set below the elastic body 5, so that amplification of vibration is suppressed, and Even if the frame body 3 vibrates due to the drive of the vibrator 2, this vibration is not propagated to the support portion 4, and therefore is not propagated to the floor surface F where the support portion 4 stands up.

  And from this, as shown in FIG. 3, this elastic body 5 is arranged between the frame body 3 and the support portion 4 as shown in FIG. It can be said that the base portion as the support portion 4 may be the floor surface F and disposed between the floor surface F and the frame body 3.

  However, in the place shown in FIG. 3, since the frame body 3 is positioned immediately above the floor surface F, the vibrator 2 connected to the lower surface of the frame body 3 is dug down to the floor surface F. It is good to be accommodated in the pit part P formed in this way.

  The above is the configuration of the vibration exciter according to the present invention. For example, even in the proposal disclosed in Patent Document 1 described above, the external appearance of the exciter (1) is on the lower side of the frame (3). , The position of the center of gravity of the vibrator (1) is lower than the position of the center of gravity of the frame (3), and therefore the frame (3) cannot easily vibrate due to the drive of the vibrator (1). It can also be said that

  However, in the proposal disclosed in Patent Document 1, since the frame (3) is erected directly on the floor surface or the like via the lower end side corresponding to the leg portion that can also be called the support portion 4 in the present invention, If the frame (3) vibrates, there is a problem that the vibration is directly propagated to the floor surface.

  On the other hand, the vibration device according to the present invention has the support portion 4 and the elastic body 5 between the support portion 4 and the frame body 3. Even if it vibrates due to the drive of the vessel 1, it is not necessary to propagate this vibration to the floor surface F side, and maintenance is performed as it is without deteriorating the surrounding environment where the vibration exciter is installed. It becomes possible to do.

  That is, in the vibration device of the present invention, since the support portion 4 is provided below the frame body 3, the position of the center of gravity of the frame body 3 having the support portion 4 is increased.

  On the other hand, in the vibration device of the present invention, even if the frame body 3 vibrates due to the drive of the vibrator 2, the position of the center of gravity of the vibrator 2 is the center of gravity of the frame body 3. Since the position of the center of gravity of the vibrator 2 is above the position of the center of gravity of the frame body 3, the frame body 3 is less likely to vibrate.

  In the vibration device of the present invention, since the elastic body 5 is disposed between the frame body 3 and the support portion 4, it is possible to prevent the vibration of the frame body 3 from being transmitted to the support portion 4. Therefore, even if the mass of the frame body 3 is not more than 10 times the vibration force of the vibration exciter, it is not affected by vibration caused by the drive of the vibration exciter, and the Make it easy to ensure.

  As a result, according to the vibration exciter of the present invention, it is possible to apply a static load by making the vibrator 2 hydraulic, compared to the case where the vibrator 2 is electromagnetic. In addition, it is advantageous in that the vibration exciter can be used without fear of the influence of electromagnetic noise.

  According to the vibration device of the present invention, the frame body 3 is not enlarged so as to have a large mass, does not occupy a large installation area when installing the vibration device, and does not increase the overall weight. This is advantageous in that the excitability of the vibration exciter can be improved.

  Suitable for use in durability tests and fatigue tests on specimens.

DESCRIPTION OF SYMBOLS 1 Excitation stand 2 Exciter 3 Frame body 3a Through-hole 4 Support part 5 Elastic body 21 Cylinder body 22 Rod body 23 Bracket 31 Horizontal part 32 Portal frame B Support plate F Floor surface P Pit

Claims (5)

A shaking table on which the specimen is placed;
A shaker for vibrating the shaker table in the vertical direction,
In a vibration apparatus having a frame body that holds the vibration exciter,
A support portion is provided below the frame body,
While the elastic member is disposed between the supporting portion and the frame body,
The shaker vibrating device characterized in that the center of gravity formed by the lower center of gravity of the frame body. Formed by a lower than the vibrator gravity center position said elastic body
The vibration device according to claim 1. The vibrator is composed of a fluid pressure cylinder that allows the rod body to appear and retract with respect to the cylinder body,
Wherein with the cylinder body is held on the lower surface side of the frame body while the axially vertical direction, the rod body is made by connecting the shaker table at the upper end
The vibration apparatus according to claim 1 or 2 , wherein And has a horizontal portion of a flat plate shape in which the frame body for holding the vibrator on the lower surface,
A portal frame is detachably connected to the horizontal portion.
The excitation device according to any one of claims 1 to 3, wherein The supporting portion is the floor of the lower of the elastic body, or is a tower erected on the floor of the lower of the elastic body, or standing on the support plate installed on the floor of the lower of the elastic member Become a supporting column
The excitation device according to any one of claims 1 to 4, wherein

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