JPH10272419A - Dynamic type vibration generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the mass of a member for connecting a moving coil and a vibration exciting base to reduce exciting force required for obtaining prescribed acceleration and to miniaturize a vibration generator to attain the cost reduction. SOLUTION: In dynamic type vibration generator A in which an alternating current is fed to a moving coil 11 arranged in a magnetic field by a permanent magnet or an exciting coil 6 to obtain exciting force, a slit 13 extending in the vibration direction of the moving coil 11 is formed in a shell part 1 of the vibration generator, also an extending member 15 extending to the outside in the direction crossing perpendicularly to the vibration direction thereof and through the slit 13 is connected to the moving coil 11 and an exciting base 17 for mounting a material to be vibrated is provided at the outer extended end of the extending member 15. Moreover, a guide rail 18 extending along the longitudinal direction thereof is arranged in the slit 13, and also rollers 20 rolling on the guide rail 18 is freely rotatably fitted to the extending member 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-dynamic vibration generator that vibrates an object to be vibrated, such as a test sample, for a vibration test, vibration stress screening, and the like.

[0002]

2. Description of the Related Art Generally, an electrodynamic vibration generator of this kind is
An alternating current is supplied to a movable coil arranged in a magnetic field by a permanent magnet or an exciting coil to obtain an exciting force, and FIG. 5 shows one specific configuration of the related art.

That is, in the case of this conventional example, exciting coils b and b are arranged on both sides in a main yoke a constituting a body of a vibration generator, while a movable coil d is provided on the outer periphery of a table c. ing. Table c is a boss c1
And a ring-shaped rim c2 which is a mounting portion for the movable coil d
Are connected by a plurality of, for example, eight arm portions c3, c3,... Arranged at equal intervals in the circumferential direction, and centers extending in the axial direction are respectively provided between the arm portions c3, c3 adjacent to each other in the circumferential direction. A pole e is arranged, and both ends of each center pole e are held by a pair of end face plates f and g constituting end faces of the vibration generator. One ends of first and second hollow guide shafts h and i each having a substantially quadrangular prism shape extending toward the opposite sides in the axial direction are fixed to the boss c1 of the table c. The first guide shaft h extends outward from one end face plate f side, and a vibrating table (not shown) for mounting an object to be vibrated is attached to the outer extending end thereof. The center pole e is provided with four guide rollers j, j,... Which are respectively opposed to and contact the four outer peripheral surfaces of the first guide shaft h. The second guide shaft i extends outside through the other end face plate g, and a lead wire k for supplying an alternating current to the movable coil d is provided inside the second guide shaft i. , Four guide rollers m, m,... Which are respectively opposed to and contact the four outer peripheral surfaces of the second guide shaft i around the through hole of the end face plate g. Thus, when an alternating current is supplied to the movable coil d under a strong magnetic field generated by the exciting coils b and b and a vibrating force acts, the movable coil d or the table c becomes the guide shaft h,
Under the guide between i and the guide rollers j and m, the main yoke a vibrates in the axial direction, and accordingly the vibration table is vibrated in the axial direction of the first guide shaft h. In the figure, n is a cover attached to the end plate g so as to cover the second guide shaft i and the lead wire p connected from one end (externally extending end) of the guide shaft i to the end plate g. is there.

[0004]

However, in the above-described conventional vibration generator, the first guide shaft h extends in the axial direction of the main yoke a, which is the direction of vibration of the movable coil d, and the first guide shaft h extends outside the guide shaft h. Because it is a configuration that attaches a vibration table to the outgoing end,
When the vibration amplitude of the movable coil d, that is, the maximum vibration displacement of the vibration generator is large, the length of the guide shaft h is correspondingly increased, and the mass thereof is also increased. Therefore, it is necessary to increase the excitation force in order to obtain a predetermined acceleration, which has been one of the causes of increasing the size and cost of the vibration generator.

[0005] The present invention has been made in view of the above points, and it is an object of the present invention to provide a body (such as a conventional main yoke a) even if the vibration generator has a large maximum displacement. Paying attention to the fact that the thickness dimension of the movable coil does not become so large, the mass of the movable coil can be reduced by extending the member for attaching the excitation table in the thickness direction of the body, that is, the direction orthogonal to the vibration direction of the movable coil. An object of the present invention is to make the vibration generator as small as possible to reduce the exciting force necessary to obtain a predetermined acceleration, thereby reducing the size and cost of the vibration generator.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, an exciting current is obtained by supplying an alternating current to a movable coil arranged in a magnetic field by a permanent magnet or an exciting coil. In the electrodynamic vibration generator, a slit extending in the vibration direction of the movable coil is formed in the body of the vibration generator, and the movable coil is extended in a direction orthogonal to the vibration direction and extending outside through the slit. The projecting members are connected to each other, and a vibrating table on which a vibrating object is placed is provided at an outer extending end of the extending member. As a result, when the movable coil vibrates in its axial direction, the extending member and the vibrating table vibrate along the slit of the vibration generator body. A vibration test or the like can be performed in the same manner as described above. In addition, even if the maximum vibration displacement of the vibration generator is large, the extension member extending from the movable coil in the direction orthogonal to the vibration direction is not so large and the mass is small, so that the predetermined acceleration is increased. It is possible to reduce the exciting force required to obtain the vibration.

[0007] The inventions according to claims 2 and 3 both show preferable embodiments of the invention according to claim 1. That is, the invention according to claim 2 has a configuration in which a guide rail extending along the longitudinal direction is provided in the slit, and a roller that rolls on the guide rail is rotatably attached to the extending member. . Accordingly, when the extension member and the vibration table vibrate along the slit, the vibration is smoothly performed under the guide between the guide rail and the roller.

The invention according to claim 3 is based on the premise that an electrodynamic vibration generator is used as in the invention according to claim 1, and each of the movable coils is provided at two positions across an axis of a body of the vibration generator. Along with forming a slit extending in the vibration direction, the movable coil is connected to a pair of extending members extending in the direction orthogonal to the vibration direction and extending outside through the slits,
A vibrating table on which an object to be vibrated is provided is provided at an outer extending end of one of the extending members, and a lead member for supplying an alternating current to the movable coil is provided at the other extending member. As a result, the weight of the movable coil is balanced between the vibrating table side and the side opposite to the axis line (the side on which the lead member is provided), and occurrence of abnormal vibration of the vibration generator is prevented.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the overall structure of an electro-dynamic vibration generator A according to an embodiment of the present invention. The body of the vibration generator A is constituted by a main yoke 1 and both front and rear end faces are constituted by end face plates 2 and 3. The main yoke 1 is fixed on the base 4 so that the axial direction is horizontal, and the end face plates 2 and 3 are fixed to the main plate 1 respectively. The main yoke 1 is composed of two left and right half yokes 1a and 1b, the outer peripheral surface of which is formed in the shape of a quadrangular prism as a whole, and the inner peripheral surface thereof is formed in a cylindrical shape.

At both ends of the main yoke 1, there are formed coil housing portions 5, 5 having an inner diameter larger than that of the central portion, and each of the coil housing portions 5 has a pair of exciting coils 6, 6, respectively. Are disposed, and the end face plates 2 and 3 are fixed to the main yoke 1 from the side of the exciting coil 6. A substantially cylindrical center pole 7 extending in the axial direction is disposed in the main yoke 1.
Is fixed to the inner surface of the end plate 3 by bolting, and the other end is fitted to a ring-shaped wedge member 8 constituting a part of the end plate 2 and is flush with the outer surfaces of the end plate 2 and the wedge member 8. It has become. A copper ring 9 is fitted on the outer peripheral surface of the center pole 7, and a ring-shaped table 12 holding a movable coil 11 is fitted on the outer periphery of the copper ring 9 so as to be displaceable or vibrated in the axial direction. I have.

Half yoke 1a, 1 of main yoke 1
b are fixed to the base 4 in a state where they are separated from each other, and slits 1 extending in the axial direction, that is, in the vibration direction of the movable coil 11, respectively at two upper and lower positions with the axis of the body of the vibration generator A interposed therebetween.
3 and 14 are formed. On the other hand, the main yoke 1 is provided in the movable coil 11 or the table 12 in the radial direction orthogonal to the vibration direction and through the slits 13 and 14.
And a pair of upper and lower extending members 15 and 16 extending outside. In addition, the table 12 is the extension member 1.
In order to facilitate the connection, the connecting portions with 5, 16 are formed wider in the axial direction than the other portions.

As shown in detail in FIG. 3, the outer extension end of the upper extension member 15 has an object to be vibrated (a test product in a vibration test, a mass production product in a vibration stress screening, or a mass-produced product thereof). A vibration table 17 on which a storage case or the like is placed is attached. A guide rail 18 extending in the longitudinal direction of the slit 13 is attached to a portion forming a side wall of the slit 13 of one half yoke 1a via an attachment member 19 with its guide surface 18a facing upward, and an extension member is provided. 1
The roller 5 has two rollers 20, 20 before and after rolling on a guide surface 18a of the guide rail 18, respectively.
The rollers 20 are rotatably mounted, and each roller 20 has an annular groove 22 formed in contact with the guide surface 18a of the guide rail 18.

Further, the lower extending member 16 has a structure shown in FIG.
As shown in detail in FIG. 1, relay lead wires 26 and 26 and lead fittings 27 and 27 as lead members for supplying an alternating current to the movable coil 11 are attached, and each lead fitting 27 is provided with a main yoke. One end of a lead wire 28 wired below 1 is connected. One half of the half yoke 1a has a slit 1
The guide rail 29 extending in the longitudinal direction of the guide member 4 is attached via an attachment member 30 with its guide surface 29a facing downward, and the guide rail 29 is attached to the extension member 16.
Two rollers 31 before and after rolling on the guide surface 29a of the
The rollers 31 are rotatably mounted via roller shafts 32 and the like.
An annular groove 33 in contact with 9a is formed.

1 and 2, reference numeral 41 denotes a table 12
A stopper for regulating the vibration region of
Reference numeral 1 denotes a portion adjacent to the copper ring 9 fitting portion of the center pole 7 (that is, a vibration region of the table 12), and a plurality of reference numerals 1 are provided at predetermined intervals in a circumferential direction thereof. 42 and 43
Are ducts provided on the front surface (the outer surface of the end face plate 2 and the like) and the left and right side surfaces (mainly the outer surface of the main yoke 1) of the vibration generator A, and the insides of both ducts 42 and 43 are communicated with each other. At the same time, the main yoke 1 has a communication hole 4 for communicating each coil housing portion 5 with the inside of the duct 43.
4 is formed so that air is supplied to the inside of the vibration generator A through the ducts 42 and 43 and the communication hole 44 by a blower or the like (not shown) to be cooled. Reference numeral 45 denotes a hanging bracket attached to a side surface of the main yoke 1.

Next, the operation and effect of the above embodiment will be described.
When an exciting current acts upon supplying an alternating current to the
The table 1 to the table 12 vibrate in the axial direction on the center pole 7, and the extending member 15 and the vibration table 17
Vibrates along the slit 13 of the vibrating table 1
7, a vibration test, a vibration stress screening, and the like can be performed on the object to be vibrated. In addition, even if the maximum amplitude of the vibrating table 17, that is, the maximum displacement of the vibration generator A is large, the extending member 15 extending from the movable coil 11 to the outside through the slit 13 of the main yoke 1 is not so large. Since the mass is reduced, the exciting force required to obtain a predetermined acceleration can be reduced, and the size and cost of the vibration generator A can be reduced accordingly.

An extension member 16 extending to the outside through the slit 14 of the main yoke 1 is also connected to a lower side of the table 12 opposite to the vibration table side (upper side) with respect to the axis, and is connected to the lower side. By providing the relay member 26 and the lead fitting 27 for supplying the alternating current to the movable coil 11 on the projecting member 16, the weight of the table 12 or the movable table 11 on the vibrating table side and the opposite side of the axis line is reduced. Are balanced, and occurrence of abnormal vibration of the vibration generator A can be prevented.

Further, the upper and lower slits 13, 1
4 are provided with guide rails 18 and 29 extending along the longitudinal direction, respectively, and the extension members 15 and
By mounting the rollers 20 and 31 that roll on the guide rails 18 and 29 corresponding to the guide rails 16, the vibrations of the extending members 15 and 16 and the vibration table 17 at the time of vibration are reduced by the guide rails 18 and 29. The operation can be smoothly performed by the guide with the rollers 20 and 31. In addition, the upper roller 20 rolls on the upper surface (guide surface 18a) of the guide rail 18, and the lower roller 31 rotates on the lower surface (guide surface 2) of the guide rail 29.
9a) Rolling on the upper and lower rollers 20 and 31 can prevent vertical displacement of each other and thus vertical displacement of the table 12 and the movable coil 11. Further, the slits 13 and 14 can easily arrange and mount the guide rails 18 and 29.

It should be noted that the present invention is not limited to the above embodiment, but includes various other forms.
For example, in the above-described embodiment, the main yoke 1 is constituted by two left and right half yokes 1a and 1b.
Although the upper and lower slits 13 and 14 are formed between a and 1b, the present invention may be such that a slit extending in the axial direction is formed in one body member by cutting or the like.

In the above embodiment, the roller 20 of the upper extension member 15 is on the upper surface (guide surface 18a) of the guide rail 18, and the roller 31 of the lower extension member 16 is on the lower surface (guide surface) of the guide rail 29. Although the surface 29a) is configured to roll, the present invention is configured to roll with the corresponding guide rails 18, 29 sandwiched between the extending members 15, 16 from both the upper and lower sides in order to enhance the guiding function. A pair of upper and lower rollers may be provided.

Further, in the above embodiment, the main yoke 1 is arranged horizontally and the vibration direction of the vibration table 17 is set in the horizontal direction. However, in the present invention, the vibration direction of the vibration table is set in the vertical direction. It is needless to say that the present invention can also be applied to a device or a device in which the vibration direction of a vibration table is switched between a horizontal direction and a vertical direction. Further, the present invention is not limited to the embodiment in which an alternating current is supplied to the movable coil 11 arranged in the magnetic field by the excitation coil 6 to obtain an exciting force, and a permanent magnet is used instead of the excitation coil 6. Needless to say, the same can be applied to the existing ones.

[0022]

As described above, according to the electrodynamic vibration generator of the present invention, the extension member connecting the movable coil and the vibration table extends in the direction orthogonal to the vibration direction of the movable coil. By doing so, the size and mass of the extending member can be reduced as much as possible while securing a vibration test or the like on the object to be excited on the exciting table in the same manner as before, so that the predetermined acceleration is increased. The required excitation force to obtain
The size and cost of the vibration generator can be reduced.

In particular, according to the second aspect of the invention, the vibration of the extension member and the vibration table during the vibration can be smoothly performed by the guide between the guide rail and the roller, and the performance of the vibration test and the like can be improved. It also has the effect of being able to contribute.

According to the third aspect of the present invention, since the weight can be balanced between the vibrating table side of the movable coil and the opposite side across the axis, the effect of preventing abnormal vibration can be prevented. Have.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a vibration generator according to an embodiment of the present invention.

FIG. 2 is a front view in which the right half is cut.

FIG. 3 is a cross-sectional view of the vicinity of an upper extension member.

FIG. 4 is a cross-sectional view of the vicinity of a lower extension member.

FIG. 5 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 A Vibration generator 1 Main yoke (body) 6 Exciting coil 11 Moving coil 12 Table 13, 14 Slit 15, 16 Extension member 17 Exciting table 18, 29 Guide rail 20, 31, Roller 26 Relay lead (lead member) 27 Lead fitting (lead member)

Claims (3)

[Claims] 1. An electrokinetic vibration generator for obtaining an exciting force by supplying an alternating current to a movable coil arranged in a magnetic field by a permanent magnet or an exciting coil, wherein the movable coil is provided on a body of the vibration generator. A slit extending in the vibration direction of the movable coil is formed, and an extending member extending in the direction orthogonal to the vibration direction and extending outside through the slit is connected to the movable coil. An electrodynamic vibration generator characterized in that a vibration table on which an object to be vibrated is placed is provided. 2. A guide rail extending along a longitudinal direction of the slit is provided, and a roller rolling on the guide rail is rotatably mounted on the extending member. The electrodynamic vibration generator according to claim 1, wherein: 3. An electrokinetic vibration generator in which an alternating current is supplied to a movable coil disposed in a magnetic field generated by a permanent magnet or an excitation coil to obtain an exciting force. A slit extending in the vibration direction of the movable coil is formed at each of the two sandwiched positions, and the movable coil has a pair of extending members extending in a direction orthogonal to the vibration direction and extending through the slits to the outside. A vibrating table on which an object to be vibrated is mounted is provided at an outer extending end of one extending member, and a lead member for supplying an alternating current to the movable coil is provided at the other extending member. An electrodynamic vibration generator, which is provided.