JPH07181104A - High rigidity structure of thruster in impact vibrator - Google Patents

Abstract

PURPOSE:To achieve a higher testing accuracy by raising rigidity of a main body part of a thruster having a thruster coil wound on the outside thereof in an impact vibrator. CONSTITUTION:Two reinforcing plates 16a and 16b are put together orthogonal to each other to make a cross in cross section and a thruster coil 4 is wound on the outside thereof to form a main body part of a thruster while two slit grooves 21 are arranged orthogonal to each other at a magnetic pole part 7 of a stator to make a cross in cross section. The two reinforcing plates 16a and 16b at the main body part of the thruster are inserted through the two slit grooves 21 of the magnetic pole part 7 of the stator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for increasing the rigidity of a thruster in an impact vibration exciter for moving an object under test with high acceleration.

[0002]

2. Description of the Related Art First, the structure of an impact exciter and the structure of a conventional thruster in this impact exciter will be described with reference to FIGS. Impact shaker
Thruster A'moves a fixed distance while fixing the specimen
And a stator B ′. The conventional thruster A'is composed of four reinforcing bars 1 which are equally divided in the circumferential direction.
The ring body 2 is fitted into the front end of the, and these are fixed together, and another ring body 3 is brought into contact with the rear end face thereof, and these are fixed together, and the outside of each reinforcing bar 1 A thruster coil 4 is wound around the core body 5 to form a cylindrical main body portion 5, and a platform portion 6 for fixing the sample D is provided on the front plate surface of the ring body 2 forming the main body portion 5. It has a different structure. On the other hand, the stator B ′ has a structure in which an annular hole 8 is provided outside the magnetic pole portion 7 and a field coil 9 is installed so as to face the annular hole 8.

The main body 5 of the thruster A'is fitted in the annular hole 8 of the stator B ', and the thruster A'is movable in its axial direction. Two pieces 1 are provided on the lower surface of the horizontal plate 11 which constitutes the platform portion 6 of the thruster A '.
The pair of bearings 12 are arranged laterally and mounted,
Each bearing 12 is fitted in a rail-shaped bearing guide 13, respectively. In addition, the roller-shaped bearing 1 is provided at the rear end of each reinforcing bar 1 that constitutes the main body 5 of the thruster A '.
4 are respectively attached, and a plurality of axial grooves 15 for fitting the bearing 14 and a portion supporting the bearing 14 are equally divided in the circumferential direction on the outer peripheral surface of the magnetic pole portion 7 of the stator B ′. The roller-shaped bearing 14 is fitted in each axial groove 15. Therefore, the thruster A ′ has four roller-shaped bearings 14 fitted in the axial grooves 15 on the outer peripheral surface of the magnetic pole portion 7 of the stator B ′, and two bearings 12 fitted in the rail-shaped bearing guide 13. It is supported by and moves in its own axial direction.

Then, as shown by a chain double-dashed line in FIG. 7, the specimen D is fixed to the lateral plate 11 which constitutes the platform portion 6 of the thruster A ', and the thruster A'is fixed to the stator B'. When the coils 4 and 9 are pulled out and energized, the thruster coil 4 arranged in the magnetic field created by the field coil 9 is mechanically acted upon by the current flowing therethrough, and the thruster A ′ is at high acceleration. Arrow P
Move in the direction of and stop. As the thruster A ′ moves at high acceleration, a shock is applied to the sample D fixed to the platform section 6.

In the body portion 5 of the conventional thruster A ', both ends of a plurality of reinforcing bars 1 arranged in the circumferential direction are fixed by ring bodies 2 and 3, respectively, and a thruster coil is provided outside each reinforcing bar 1. Each reinforcing bar 1 has a structure in which 4 is wound.
Has a structure in which it is connected via a pair of ring bodies 2 and 3, so that the rigidity of the thruster A ′ is low. Then, during the impact test, vibration occurs in the thruster, and if the influence of this vibration is great, the waveform of the acceleration applied to the sample D deviates from the command waveform, and the test accuracy decreases. For this reason, a vibration filter is used to remove the vibration generated during the test, but this vibration has a characteristic that the higher the frequency, the easier the vibration is to be removed.

The conventional thruster A'has a low rigidity because of its structure, so that the frequency of generated vibration is low. Therefore, the removal rate of the vibration generated by the thruster A ′ by the vibration filter is low, which is one of the causes for lowering the test accuracy.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to increase the rigidity of the main body of a thruster having a thruster coil wound on the outer side thereof in an impact vibration exciter to improve the test accuracy.

[0008]

Means for Solving the Problems In order to solve the above problems, the means adopted by the present invention is such that a thruster coil is wound around a plurality of reinforcing members to form a cylindrical main body,
A thruster having a platform portion for fixing the sample to the tip portion of the main body portion and an annular hole for fitting the main body portion of the thruster into the outer periphery of the magnetic pole portion are provided so as to face the annular hole. And a stator in which a field coil is installed so that the body portion of the thruster is fitted in an annular hole of the stator, and the thruster is supported by a bearing so as to be movable in the axial direction thereof. By the mechanical action of the current generated by energizing each coil,
In an impact exciter configured to move the thruster at high acceleration to impact the sample, a plurality of reinforcing members forming the main body of the thruster are integrally structured and the stator is configured. A slit groove for inserting the reinforcing material is provided in the magnetic pole portion, and a plurality of reinforcing materials forming the main body portion are formed in the slits of the magnetic pole portion with the main body portion of the thruster fitted in the annular hole of the stator. That is, it is configured to be inserted into the groove.

[0009]

The main body of the thruster has a higher rigidity as compared with the structure in which the plurality of reinforcing members are separated because the plurality of reinforcing members constituting the thruster have an integral structure. . Therefore, the vibration generated in the thruster during the impact test has a high frequency and is easily removed by the vibration filter, and the waveform of the acceleration generated in the test piece becomes close to the command waveform, and the test accuracy is improved.

[0010]

EXAMPLES The present invention will be described in more detail below with reference to examples. 1 is a front view of an impact exciter according to the present invention, FIG. 2 is a plan view of the same, and FIG.
FIG. 4 is an enlarged cross-sectional view of the X-ray, FIG. 4 is a vertical cross-sectional view of the stator B, and FIG. 5 is a partial perspective view of the stator B.
FIG. 6 is a perspective view of the thruster A in which the platform portion 18 is omitted. The same parts as those described in the section “Prior Art” are designated by the same reference numerals to avoid redundant description, and only characteristic parts of the present invention will be described. As shown in FIGS. 1, 2 and 6, the thruster A has two reinforcing plates 16a and 16b which are orthogonal to each other so as to have a cross-shaped cross section, and both end portions thereof have a ring body 2. 3, the thruster coil 4 is wound around the outer peripheries of the two reinforcing plates 16a, 16b to form the main body portion 17, and the platform portion 18 is provided on the front surface of the ring body 2 forming the main body portion 17. Has been. On the lower surface of the horizontal plate 19 that constitutes the platform portion 18, two pieces are arranged in the horizontal direction.
Two sets of bearings 12 are provided along the front-rear direction, and the two sets of bearings 12 are fitted into the rail-shaped bearing guides 13, respectively. The bearing 12 supports the bearing guide 13 in a cantilever manner.

Further, in the cylindrical magnetic pole portion 7 constituting the stator B, two slits for inserting the two reinforcing plates 16a, 16b which are integrated so as to have a cross-shaped cross section. The grooves 21 are provided orthogonally along the axial direction of the magnetic pole portion 7 (see FIG. 5). Then, the two reinforcing plates 16a and 16b constituting the main body portion 17 of the thruster A are inserted between the two slit grooves 21 of the magnetic pole portion 7 (see FIG. 3).

Then, as shown in FIG. 1, in a state where the specimen D is mounted and fixed on the upper surface of the lateral plate 19 which constitutes the platform portion 18 of the thruster A, as indicated by a chain double-dashed line in FIG. When the thruster A is drawn out from the stator B and the coils 4 and 9 are energized, the thruster coil 4 arranged in the magnetic field created by the field coil 9 is mechanically affected by the current flowing therethrough. , The thruster A is supported by the two sets of bearings 12 which are one set, and the thruster A moves in the direction of the arrow P with high acceleration to stop, and thereby the test piece D fixed to the platform portion 18 An impact force is applied to.

During the above-mentioned impact test, vibration is generated in the thruster to which high acceleration is applied.
Is formed by winding the thruster coil 4 around the outer circumference of two reinforcing plates 16a, 16b which are integrated so that the cross section becomes a cross shape, and the two reinforcing plates 16a, 16b have an integral structure. As a result, the rigidity of the main body 17 is increased. For this reason, the frequency of the vibration generated in the thruster A during the impact test becomes high, and the vibration is easily removed by the vibration filter.

In the above-mentioned embodiment, the cross section has a cross shape.
The reinforcing plates 16a and 16b are made to intersect with each other so as to be integrated, and the magnetic pole portion 7 of the stator B is provided with a slit groove 21 into which the integrated reinforcing plate 16 can be inserted. The reinforcing material in which 4 is wound to form an integral structure is not limited to the above-described configuration. For example, three reinforcing plates may be integrated with each other in a cross-sectional shape.

[0015]

As described above, according to the present invention, in an impact exciter, a plurality of reinforcing members constituting a main body of a thruster are integrally structured, and the reinforcing members are inserted into magnetic pole portions constituting a stator. A slit groove is provided, and in a state where the main body of the thruster is fitted in the annular hole of the stator, a plurality of reinforcing members forming the main body are configured to be inserted into the slit grooves of the magnetic pole portion. Therefore, the rigidity thereof is higher than that of the thruster having the conventional structure in which a plurality of reinforcing materials are separated. Therefore, the vibration generated in the thruster during the impact test has a high frequency and is easily removed by the vibration filter, and the waveform of the acceleration generated in the test piece becomes close to the command waveform, and the test accuracy is improved.

[Brief description of drawings]

FIG. 1 is a front view of an impact exciter according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an enlarged cross-sectional view taken along line XX of FIG.

FIG. 4 is a vertical sectional view of a stator B according to the present invention.

FIG. 5 is a partial perspective view of a stator B of the same.

FIG. 6 is a schematic perspective view of the platform portion 18 of the thruster A according to the present invention.

FIG. 7 is a front view of a conventional impact exciter.

FIG. 8 is a plan view of the same.

9 is an enlarged cross-sectional view taken along the line X'-X 'of FIG.

FIG. 10: Platform part 6 of conventional thruster A ′
It is the perspective view which abbreviated.

[Explanation of symbols] A: Thruster B: Stator D: Specimen 4: Thruster coil 7: Magnetic pole part 8: Annular hole 9: Field coil 16a, 16b: Reinforcing plate 17: Thruster main body part 18: Thruster platform part 21: Slit groove provided in the magnetic pole part

Claims (2)

[Claims] 1. A thruster in which a thruster coil is wound around a plurality of reinforcing members to form a cylindrical main body portion, and a platform portion for fixing a sample is provided at a tip portion of the main body portion. An annular hole for fitting the main body of the thruster into the outer circumference of the magnetic pole portion, and a stator in which a field coil is installed so as to face the annular hole, and the annular hole of the stator is provided with The thruster body is fitted into the thruster, and the thruster is supported by bearings so as to be movable in the axial direction. The thruster is moved at high acceleration by the mechanical action of the electric current generated by passing through each coil. In the impact exciter configured to give an impact to the specimen, a plurality of reinforcing members forming the main body of the thruster are integrated into one body, and the magnetic pole portion forming the stator is formed. A slit groove for inserting the reinforcing member is provided, and a plurality of reinforcing members forming the main body portion are inserted into the slit groove of the magnetic pole portion with the main body portion of the thruster fitted in the annular hole of the stator. The thruster has a high-rigidity structure in the impact shaker. 2. A thruster coil is wound around the two plate-shaped reinforcing members which are orthogonal to each other so as to have a cruciform cross-section, and the thruster coil is wound around the main body to form a main body of the thruster. Two slit grooves are provided orthogonally to each other in the magnetic pole part so as to have a cruciform cross section, and the two plate-shaped reinforcing members forming the main body of the thruster are respectively inserted into the two slit grooves of the stator. The structure for increasing the rigidity of the thruster in the impact shaker according to claim 1, wherein