JPH0233153Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a vibration testing device.

As a conventional vibration test device, there is one as shown in FIG. 1 (side sectional view), which is provided with a magnetic field forming mechanism M consisting of a yoke portion 2 with an excitation coil 1 that receives a direct current and a pole piece 3. and
An annular gap 4 is formed between the yoke portion 2 and the pole piece 3.

Therefore, a DC magnetic field is formed in this gap 4.

In addition, a lead wire 6 from an external power source 5 is provided in the gap 4.
A movable coil 7 as a conductive movable member that receives an alternating current supply via the movable coil 7 is fitted, and the movable coil 7 is connected to a vibrating member 9 supported by a spring 8.

The vibrating member 9 is supported on the upper surface of the pole piece 3 via a spring 8 so as to be able to reciprocate (see arrow P) in the vertical direction in the figure.

Further, the vibrating member 9 is guided by a guide mechanism 10 attached to a support member 11 so that it can smoothly reciprocate in the vertical direction.

This guide mechanism 10 is disposed between the vibrating member 9 and a supporting member 11 around it, and
It is composed of rollers that support and guide the side walls of the

With this structure, by passing a direct current through the excitation coil 1 and an alternating current through the movable coil 7, this alternating current interlinks with the magnetic flux in the gap 4, so an electromagnetic force is generated, and the vibrating member 9 vibrates.

However, in such a conventional device, the contact portion between the vibrating member 9 and the roller is worn out, causing play in the contact portion of the roller, which worsens the vibration waveform. There is a problem in that the movable coil 7 is tilted and comes into contact with the yoke portion 2, resulting in damage to the coil or disconnection.

Therefore, as shown in FIG. 2a (an enlarged side view of another example of the guide mechanism in the part shown in FIG. 1) or FIG. 2b (a modification of FIG. 2a), the vibrating member 9 and Vibration test devices that use durable half-loop springs 12, loop springs 13, etc. that can withstand long-term use between the support member 11 have been developed in the past, but none of them can be used in the lateral direction. Since the restraining force is weak, there is a problem in that in a vibration test of a specimen that generates a large moment, the movable coil 7 tilts and comes into contact with the yoke portion 2, causing damage to the coil or disconnection.

Further, due to the crosstalk phenomenon, the vibration of the vibrating member 9 is transferred to the supporting member 11,
There is also a risk that the yoke portion 2 and the movable coil 7 may come into contact with each other, causing damage to the coil or disconnection, as in the case described above.

In addition, the half-loop spring 12 and the loop spring 13
is attached to the support member 11, or the support member 11 is constantly pressed with a screw or the like.

The present invention attempts to solve these problems by providing a vibration testing device that can withstand long-term reciprocating vibration of a vibrating member and can also withstand vibration tests using uneven loads. The purpose is to

Therefore, in the vibration testing device of the present invention, the side wall of the vibrating member is elastically supported between the vibrating member that reciprocates by a drive mechanism and the support member provided around the vibrating member. an elastic guide member for guiding the vibrating member, between a mounting portion of the elastic guide member on the support member and a contact portion of the elastic guide member on a side wall of the vibrating member;
A variable outer diameter cylindrical roller with a notch for making the outer diameter variable is inserted, and a tapered receiving surface is formed inside each end of the cylindrical roller so as to expand outward. The present invention is characterized by being provided with a pair of tapered sliding members that engage with these receiving surfaces, respectively, and a spring mechanism that acts in a direction to bring these sliding members closer to each other.

Hereinafter, a vibration testing device as an embodiment of the present invention will be explained with reference to the drawings. FIG. 3 is a front view showing the guide mechanism in the device of the present invention, and FIG. 4 is a sectional view taken along the - arrow in FIG. , 3 and 4, the same reference numerals as in FIGS. 1 and 2 indicate substantially similar parts.

The vibration testing device of the present invention also includes a yoke part 2 with an excitation coil 1 that receives a direct current, and a pole piece 3.
A magnetic field forming mechanism M is provided, and an annular gap 4 is formed between the yoke portion 2 and the pole piece 3. (See Figure 1).

Therefore, a DC magnetic field is formed in this gap 4.

Furthermore, a moving coil 7 as a conductive movable member that receives alternating current from an external power source 5 via a lead wire 6 is inserted into the gap 4, and the moving coil 7 is supported by a spring 8. vibrating member 9
is connected to.

The vibrating member 9 is supported on the upper surface of the pole piece 3 via a spring 8 so as to be able to reciprocate (see arrow P) in the vertical direction in the figure.

Further, the vibration member 9 has guide mechanisms 10 each attached to a symmetrically provided support member 11 so that reciprocating vibration in the vertical direction can be performed smoothly.
Guided by.

As shown in FIGS. 3 and 4, this guide mechanism 10 is disposed between a vibrating member 9 and a supporting member 11 around it, and serves as an elastic guide member that supports and guides the side wall of the vibrating member 9. It is constituted by a half-loop spring 12.

And the half-loop spring 1 in the support member 11
A variable outer diameter cylindrical roller 16 is inserted between the mounting portion 14 of the vibration member 2 and the contact portion 15 of the half-loop spring 12 on the side wall of the vibration member 9 via a pair of spacers 17, 17.

This variable outer diameter cylindrical roller 16 has a notch 16a formed from one end 18 to the other end 19, and the cylindrical roller 16 has an arcuate cross section and a cylindrical shape. The cylindrical roller 16 is configured such that when a very large force in the lateral direction is applied to the cylindrical roller 16, the outer diameter of the cylindrical roller 16 can be reduced until the gap between the notches 16a disappears.

Furthermore, tapered receiving surfaces 18a and 1 are provided in both end portions 18 and 19 so as to expand outward, respectively.
9a is formed.

And these tapered receiving surfaces 18a, 19a
A pair of sliding members 20, 20 are engaged with each other.

Further, a spring mechanism S is provided in both end portions 18 and 19 of the cylindrical roller 16 to bias the pair of sliding members 20 and 20 in a direction toward each other.

That is, the cylindrical roller 16 is biased by the spring mechanism S so as to increase the radius of its cross section.

This spring mechanism S is provided with a shaft 21 passing through the sliding member 20, and the sliding member 20 is connected to the cylindrical roller 1.
A pair of springs 22 , 22 are provided at both ends of the shaft 21 to push the shaft 21 toward the center of the shaft 21 .

The pair of springs 22, 22 are adjusted using a torque wrench so that they have the same tension.

Since the vibration test device of the present invention is constructed as described above, in order to conduct a vibration test, a direct current is passed through the excitation coil 1 and an alternating current is passed through the movable coil 7, so that this alternating current flows through the gap 4.
Since the magnetic flux interlinks with the magnetic flux, an electromagnetic force is generated, causing the vibrating member 9 to vibrate. (See FIG. 1) As shown in FIGS. 3 and 4, if wear occurs at the contact portion between the variable outer diameter cylindrical roller 16 and the baser 17, the pair of sliding members 20,
20 is pushed toward the center of the cylindrical roller 16 by the tension of the spring 22.
As the outer diameter of the cylindrical roller 16 becomes larger,
No backlash occurs between the cylindrical roller 16 and the spacer 17.

Moreover, the vibrating member 9 is always pressed and held with a constant force by the half-loop springs 12 and the variable outer diameter cylindrical rollers 16, which are arranged symmetrically.

Furthermore, even if a very large compressive force in the lateral direction is applied to one guide mechanism 10 due to an unbalanced load on the vibrating member 9, the notch 16 of the cylindrical roller 16
When the outer diameter of the cylindrical roller 16 is reduced until the gap a disappears, the outer diameter of the cylindrical roller 16 will not be reduced any further, and the lateral rigidity of the vibrating member 9 will become very strong. In this way, the gap between the supporting member 11 and the vibrating member 9 does not shrink even if the force due to the unbalanced load of the vibrating member 9 is applied, so that the coil is prevented from being damaged or disconnected due to contact between the movable coil 7 and the yoke portion 2. In addition to reducing harmful lateral sensitivities (crosstalk),

In addition, as an elastic guide member, a half-loop spring 1 is used.
In addition to 2, a loop spring 13 may be used.

Furthermore, as the spring mechanism S, a tension spring may be provided between the pair of sliding members 20, 20.

As detailed above, according to the vibration test device of the present invention, when the contact portion between the cylindrical roller and the spacer wears out, the outer diameter of the cylindrical rollers provided symmetrically on the vibrating member expands. Therefore, play between the cylindrical roller and the spacer is eliminated, and durability against wear is improved.

In addition, even if the vibrating member is subjected to an uneven load, the cylindrical rollers increase the lateral rigidity, reducing harmful lateral sensitivity. It is possible to realize a vibration testing device that can prevent damage and disconnection and has a long life.

[Brief explanation of drawings]

Figures 1 and 2 show a conventional vibration testing device. Figure 1 is a side sectional view showing its schematic configuration, and Figure 2a is an enlarged view of another example of the guide mechanism in the section shown in Figure 1. FIG. 2b is a side view showing a modified example of the guide mechanism corresponding to FIG. 2a, and FIGS. 3 and 4 show a vibration testing device as an embodiment of the present invention. 3 is a front view showing the guide mechanism in the device of the present invention, and FIG. 4 is a sectional view taken along the - arrow in FIG. 1... Excitation coil, 2... Yoke part, 3... Pole piece, 4... Annular gap, 5... Power supply, 6
... Lead wire, 7 ... Moving coil, 8 ... Spring,
9... Vibration member, 10... Guide mechanism, 11...
Support member, 12...Half loop spring, 14...Mounting portion, 15...Contact portion, 16...Cylindrical roller with variable outer diameter, 16a...Notch portion, 17...Spacer,
18, 19...end portion, 18a, 19a...tapered receiving surface, 20...tapered sliding member, 21...
Shaft, 22... Spring, M... Magnetic field forming mechanism, P...
Vibration direction of the vibrating member, S... Spring mechanism.

Claims (1)

[Scope of utility model registration request] In the vibration testing machine, an elastic guide member that elastically supports and guides a side wall of the vibrating member is provided between a vibrating member that reciprocates by a drive mechanism and a support member provided around the vibrating member, A variable outer diameter cylindrical roller is provided with a notch for varying the outer diameter between the mounting portion of the elastic guide member on the support member and the contact portion of the elastic guide member on the side wall of the vibrating member. A pair of tapered sliding members that are inserted into each other and are formed in both ends of the same cylindrical roller so as to expand outward, a pair of tapered sliding members that respectively engage with these receiving surfaces, and A vibration testing device characterized by being provided with a spring mechanism that acts in a direction to bring sliding members closer together.