JPH02125117A - Vibrationproofing device with damper - Google Patents

Abstract

PURPOSE:To prevent propagation of vibration between a rack and a base stably as time passes by suppressing the motion of a movable member to execute attenuation of vibration for a spring elastic body by means of viscous resistance of a viscous elastic body between the movable member and a holddown member. CONSTITUTION:Between a base 1 and a rack 2 opposed thereto, an air spring 3 as a spring elastic body is formed to construct a damper 5 mainly composed of a holddown member 7, a viscous elastic body 8, and a movable member 9. The damper 5 includes a bottomed cylindrical container 6 that is arranged on the base 1 and the column of holddown member 7 formed upright in its center, and the viscous elastic body 8 in which a viscous resin, an organic polymeric material, and an inorganic material are mixed is stored in the container 6, and then a movable member 9 of the rack 2 is buried in it. The vibration added to the rack is absorbed by elastic deformation of the spring elastic body, as well as the attenuation of vibration is executed by means of viscous resistance of the viscous elastic body, and the propagation of vibration between the rack and the base can thus be prevented stably for a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a vibration isolator equipped with a vibration damper having stable vibration damping ability.

<Prior Art> Conventionally, a vibration isolating device has been interposed between the machine tool and the floor in order to prevent vibrations generated by the machine tool from propagating to the floor.

Such vibration isolators generally include a spring elastic body such as an air spring or a coil spring to absorb vibrations, and a movable plate on the side of the frame on which the machine tool is mounted to increase the vibration damping ability. was installed vertically, and was equipped with a vibration damper that damped vibrations by pressing a friction member against the movable plate.

<Problems to be Solved by the Invention> However, in a vibration isolator equipped with a damper that cushions such a frictional part, the lining of the frictional part is likely to wear out, and the damping effect changes as it wears. It was necessary to keep the vibration damping force constant by adjusting the frictional force as needed.

The present invention has been made in view of the above, and aims to provide a vibration isolator equipped with a vibration damper that can exhibit stable vibration damping ability over time. The invention has been made to achieve the above object, and includes a base, a frame facing the base via a spring elastic body, and a vibration suppressor for damping vibrations of the frame. A vibration isolator equipped with a vibration damper, wherein the vibration damper includes a viscoelastic body housed in a container provided on the base body, a fixing member provided extending in the axial direction inside the container, A vibration isolator equipped with a vibration damper includes a movable member that is provided on the frame and faces the fixed member within the container via a viscoelastic body.

Effect> The present invention is configured as described above, and the motion applied to the frame is absorbed by the elastic deformation of the spring elastic body, and the viscoelastic body between the movable member and the fixed member The viscous resistance suppresses the movement of the movable member and damps vibrations of the spring elastic body, thereby preventing vibration propagation between the frame and the base body.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal sectional view of a vibration isolator with a υJ vibrator according to an embodiment of the present invention.

In the figure, 1 is a base body, and an air spring 3 as a spring elastic body is formed between the base body 1 and an opposing frame body 2. Further, a fixing member 7. is provided between the base body l and the frame body 2. Viscoelastic body8. A vibration suppressor 5 mainly includes a movable member 9.

This damper 5 has a cylindrical growth container 6 disposed on a base 1, and a cylindrical fixing member 7 is erected in the center of the container 6 and extends in the axial direction. . A viscoelastic body 8 is housed within the container 6 .

This viscoelastic body 8 has a penetration resistance of 150g based on JIS K 2207, which allows other objects to penetrate
, 5sec, 25°C), preferably exhibits 100 to 300 II1 m, more preferably 200 to 250 mm.
It is.

Specific examples of viscoelastic materials include viscous resins such as polybutene and polyisobutylene, organic polymer materials, colloidal dispersion systems of inorganic materials, and greases for these.

Examples include those mixed with a viscosity modifier such as bitumen.

In particular, polyisobutylene has a viscosity average molecular weight of 25.0.
00-60. (100 (more preferably 27,000~
33,000) can be used alone.

Further, the frame 2 is provided with a circular movable member 9 directed downward in the axial direction. It is arranged relative to the outer circumferential surface of , keeping a predetermined interval (0.2 to 10.0 mm). In addition, the viscosity average molecular weight is 27. QOO~H,
When using polyisobutylene of 0.00 (l), it is preferable that the distance between the fixed member 7 and the movable member 9 be 0.5 to 20 m.

Further, as in this embodiment, it is preferable that the space surrounded by the fixed member 7 and the movable member 9 be closed in the circumferential direction. This is to make the escape route of 8 smaller and to ensure its resistance.

The vibration isolator with vibration damper configured as described above is placed on a strong foundation, and a machine tool is mounted on the frame 2. When the machine tool operates, the accompanying vibrations are transmitted to the air spring 3 via the frame 2, and the air spring 3 absorbs the uplifting motion through its elastic deformation, thereby mitigating the propagation of the vibrations.

At this time, the movement of the movable member 9 of the vibration damper 5 is suppressed by the viscoelastic resistance of the viscoelastic body 8 interposed between the opposing fixed member 7 and the vibration of the air spring 3 is suppressed. ,
FIG. 2 is a longitudinal sectional view of another embodiment of the present invention, which is characterized by the structure of the spring elastic body. In the following description, the same reference numerals are given to the same parts as those in the first embodiment, and the description thereof will be omitted.

The spring elastic body of this 342nd embodiment includes compression coil-shaped coil springs 13a and 13b. According to this configuration, the device can be made compact and has the effect of increasing durability.

Note that the present invention is not limited to the configuration of the above-described embodiments, and the embodiments thereof may be modified without departing from the technical idea of the present invention.For example, the fixing member 7. The shape of the movable member 9 is not particularly limited, and may be a flat member provided facing each other with the viscoelastic body 8 interposed therebetween.

Further, the vibration damper 5 may be arranged outside the spring elastic body.

Furthermore, vibration isolators with vibration dampers are generally used in sets of four, and therefore, two or four vibration isolators may be installed between a large base and a frame.

Furthermore, the same effect can be achieved by forming a structure consisting only of the vibration suppressor 5 and combining it with a vibration isolator made of another spring elastic body to suppress the vibration of the spring of the vibration isolator. .

<Effects of the Invention> As explained above, the vibration isolating device with a vibration damper of the present invention includes a base body, a frame body facing the base body via a spring elastic body, and a control for damping the vibration of the frame body. A vibration isolator with a vibration damper, comprising: a vibration damper; a viscoelastic body housed in a container provided on a base; The structure includes a movable member that is installed on the frame and faces the fixed member and the viscoelastic body in the container, so it absorbs the vibrations of the machine tool mounted on the frame. At the same time, the vibration of the spring elastic body is suppressed by the viscous resistance of the vibration damper, and i-dynamic damping is quickly performed.
Imaging propagation between the frame and the base is prevented.

Furthermore, since the vibration damper does not have a wearable member such as a lining, it is possible to stably exhibit vibration damping ability over time without the need to adjust the damping force or replace the wearable member.

Furthermore, with a vibration isolator that consists only of spring elastic bodies, a phenomenon occurs in which the press shakes back and forth just before the press stops operating. effective

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a vibration isolator equipped with a vibration damper according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of another embodiment. DESCRIPTION OF SYMBOLS 1... Base body, 2... Frame, 3... Air spring (spring elastic body), 5... Vibration damper, 7... Fixing member, 8... Viscoelastic body, 9... ...Movable parts. Patent applicant diagram

Claims (1)

[Scope of Claims] A vibration isolator equipped with a vibration damper, comprising a base body, a frame body facing the base body via a spring elastic body, and a vibration damper for damping vibrations of the frame body. The vibration damper includes: a viscoelastic body housed in a container provided on the base body, a fixing member provided extending in the axial direction within the container, and a fixing member provided on the frame and housed within the container. A vibration isolator equipped with a vibration damper, comprising: a movable member disposed opposite to the fixed member via a viscoelastic body.