JPS63266245A - Vibration isolating device - Google Patents

Abstract

PURPOSE:To excellently isolate external vibration irrespective displacement of the placing position of a substance to be placed and a center of gravity position and to stably support the substance to be placed, by a method wherein the one means, making contact with an upper base, of a spring means and an pneumatic support means is situated movably depending upon the center of gravity position of the substance to be placed. CONSTITUTION:When the center of gravity position of a substance 2 to be placed is displaced from the central part of an upper plate 3, spring units 11a1, 11a3... situated on the rail surface of a horizontal member are slid as scales of levels 47a, 47b... situated on the four sides of the upper plate are watched so that the upper plate 3 is kept horizontally. Inclination of an intermediate base 6 is corrected by changing a screw-in amount of the bolts of air support members 19a, 19b..., and fine adjustment is effected by resetting a feed air pressure through regulation of variable throttles 22a-22d. As noted above, the upper plate 3 is regulatable to a horizontal position, and the intermediate base 6 is also regulatable so as to be horizontally kept. Thereby, external vibration is excellently isolated despite of displacement of the placing position and the center of gravity position of the substance 2 to be placed, and enables stable support of the substance 2 to be placed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vibration isolator, and more particularly to a vibration isolator configured to adjust an upper plate horizontally according to the position of the center of gravity of an object to be placed.

BACKGROUND OF THE INVENTION Conventional vibration isolators include, for example, a coil spring or an air spring interposed between an upper plate on which an object is placed and a lower plate facing the upper plate and fixed to the floor, etc. There are some devices that elastically absorb input vibrations and obtain a vibration isolation effect. In addition, as another vibration isolator, there is a gate between the upper plate and the lower plate.
Some devices include an air support member that supports the upper plate in a floating state via an air layer to prevent horizontal vibrations from being transmitted to the upper plate.

Problems to be Solved by the Invention In the above vibration isolating device, in order to obtain a good vibration isolating effect, lff1
It is desirable that a certain object be placed in the center of the upper plate, and that an equal load be applied to each spring or air support member supporting the upper plate. However, if the object is placed at a position off the center of the top plate, or even if the object is placed in the center of the top board, the center of gravity may be shifted to the center of the top board due to the unique shape of the object. There may be deviations. In such a case, the load acting on each spring or air support member that supports the upper plate differs depending on the position of the center of gravity of the object to be placed, and a larger load acts on the one where the center of gravity is closer.

Therefore, in the conventional vibration isolator, there is a problem that the top plate tilts when the center of gravity of the object to be placed deviates from the center of the top plate, and a good vibration isolating effect cannot be obtained.

Therefore, an object of the present invention is to provide a vibration isolator that solves the above problems.

Means and Effects for Solving the Problems The present invention provides a pair of bases comprising an upper base on which an object is placed and a lower base opposing the base;
a spring means whose one end abuts one of the pair of bases to absorb upward and downward vibration; and an air layer provided between the other end of the spring means and the other base and at a predetermined pressure. A vibration isolator comprising an air support means that is slidable relative to the other base and supports the load of the placed object,
One of the spring means or the air support means that comes into contact with the upper base is movable according to the position of the center of gravity of the object to be placed with respect to the upper base, and the center of gravity of the object to be placed is on the upper side. The upper base can be adjusted horizontally even if the upper base is off center.

Embodiment FIGS. 1 to 3 show an embodiment of the vibration isolator according to the present invention. In each figure, an object 2 having, for example, a hill is placed on the vibration isolator 1. The vibration isolator 1 includes an upper plate (base) 3 on which an object 2 is placed, and a lower plate (base) fixed to a floor 4.
5 and an intermediate base 6 interposed between the upper plate 3 and the lower plate 5.

The intermediate base 6 includes frames 7a to 7d that are horizontally mounted.
Box-shaped contact portions 8a~
8d is provided.

As shown in FIGS. 4 and 5, the frames 7a to 7d are composed of horizontal members 9.10 each having a linear cross section.

This horizontal member 9.10 is arranged in parallel between the contact portions 8a to 8d, and has raceway surfaces 9a and 10a on which the spring unit 11 is slidably mounted. Spring unit 11 (11a
+ ~i 1aa, 11. , b+ ~11t)3.
1101 to 11Ci, 11d+ to 11da) are arranged in three pieces on each frame 78 to 7d, and as described later, they are placed on the track surfaces 9a and 10a according to the position of the center of gravity of the object 2 placed on the upper plate 3. to adjust the horizontal position of the upper plate 3.

The spring unit 11 includes a sliding plate 12 placed approximately on raceway surfaces 9a and 10a, a pair of coil springs 13 and 14,
Spring receiver 15. which abuts the upper end of coil spring 13.14.
16, and nuts 17 and 18 that are screwed into the threaded portions 15a and 16a of the spring receiver 15°16. The coil springs 13 and 14 fit into the cylindrical protrusions 12a and 12b that protrude upward from the sliding plate 12 and the protrusions 15b and 16b that protrude from the lower surface of the spring receiver 15.16 (7), and when moving. It is attached so that it will not easily come off.

Also, by turning the nuts 17 and 18, the threaded portion 15a
, 16a is adjusted, and the spring force of the springs 13, 14 supporting the upper plate 3 is adjusted.

The upper ends of the nuts 17 and 18 are in contact with the sliding plate 3f of the upper base 3, and when moving the spring unit ]-11, the sliding surface 3
Slide f.

An air support member 1 that supports the intermediate base 6 is provided between each contact portion 8a to 8d of the intermediate base 6 and the lower plate 5 through an air layer.
9 (19a to 19d) are arranged.

Each air support member 19 has a respective piping 2 as shown in FIG.
It is connected to the air source 21 via 0a to 20d. Variable degree orifices 22a to 22d are installed in the middle of the pipes 20a to 20d.
is provided, and the air source 21 is provided with an air support member 19a.
The air pressure supplied to ~19d is controlled by the variable throttles 22a~22.
2d is set to a predetermined pressure.

The air support members 198 to 19d each have the same configuration as shown in FIGS. 6 and 7. Figures 6 and 7
In the figure, the air support member 19 includes a main body 23 with an h-bottomed cylindrical shape placed on the lower plate 5, an orifice assembly 24 fixedly installed at the top inside the main body 23, and an orifice assembly 24 above the orifice assembly 24. It consists of a disk-shaped support plate 26 supported through an air layer 25.

The main body 23 is formed by integrally assembling a base shell 27 and a base 28. Through-holes 27b are formed near the four corners of the seven square flange portions 27a of the base shell 27. Further, a screw hole 28b that coincides with the through hole 27b is screwed into the rectangular seven flange portion 28a of the base 28. A height adjustment bolt 29 is screwed into this screw hole 28b, and the height position of the air support member 19 relative to the lower plate 5 can be variably adjusted by the screwing position of the bolt 29.

A supply boat 30 is bored in the side surface of the base shell 27, and is connected to one end of the pipes 20a to 20d. A cylindrical stopper 31 is provided below the orifice assembly 24. This stopper 31 is provided with a plurality of holes 31a.

An air chamber 3 is provided inside the stopper 31 and inside the orifice assembly 24 and communicates with the supply boat 30 through a hole 31a.
2 is formed.

Further, the orifice assembly 24 is formed by fixing an orifice member 33 facing the support plate 26, a sliding member 34 that slides on the base shell 27, and a spring receiver 35 with bolts 36.

A coil spring 37 is interposed between the stepped portion 27a of the base shell 27 and the collar portion 35a of the spring receiver 35, and presses the orifice assembly 24 downward.

A plurality of orifice holes 33a are bored in the orifice member 33, and the support plate 26 floats up due to the pressure of the air ejected from the orifice holes 33a and is supported in a floating state. Note that when air is being supplied from the supply boat 30, the orifice assembly 24 is displaced upward by the air pressure within the air chamber 32.

The air jetted out from the orifice hole 33a is air Jl! between the orifice member 33 and the support plate 26. 25 and then exhausted from the exhaust port 43. Note that the exhaust port 43 is provided in an annular protrusion 38 fixed to the lower surface of the support plate 26 with a screw 39. This protrusion 38 is the base shell 2
A gap 40 is formed between the protrusion 38 and the base shell 27 when the support plate 26 is floating. However, when the air supply to the supply boat 30 is stopped, the text part 38 comes into contact with the upper surface of the base shell 27 and the orifice assembly 24 also moves downward, so there is no space between the orifice member 33 and the support plate 26. A gap is formed. Therefore, when restarting when air is supplied to the supply boat 30 again, each orifice hole 33a is connected to the support plate 2.
6, the support plate 26 can be easily floated.

Further, a plurality of bolts 41 (four in this embodiment) are screwed into the upper surface of the support plate 26. The head of this bolt 41 is brought into contact with the lower surface of the contact portions 8a to 8d of the intermediate base 6. A lock nut 42 locks the bolt 41 in its protruding position.

As will be described later, the bolts 41 and the bolts 29 change the distance between the lower plate 5 and the intermediate base 6 to set the horizontal position of the intermediate base 6.

Therefore, the intermediate base 6 is supported in a floating state by the air support members 19 (19a to 19d) configured as described above at the contact portions 8a to 8d at the four corners, and the horizontal vibration input to the lower plate 5 is It is insulated by an air layer 25. Also,
When upward and downward vibrations are input to the lower plate 5, the plurality of spring units 11 absorb the upward and downward vibrations.

In this way, external vibrations are isolated! ! 1, the vibration is not transmitted to the upper plate 3 and the object 2, and the object 2 maintains a stable state.

Further, as shown in FIGS. 2 and 4, coil springs 448 to 448 are provided between the locking pins 3a to 3d of the horizontal member 3e on the lower surface of the upper plate 3 and the locking pins 5a to 5d of the lower plate 5. 44d is installed. These four coil springs 44a to 44d are tensioned radially from the center of the upper plate 3. Therefore, even if the opposing positions of the upper plate 3 and the lower plate 5 shift in the horizontal direction, the upper plate 3 and the lower plate 5 return to their original opposing positions due to the balance of the tensile forces of the springs 44a to 44d.

Also, between the lower plate 5 and the upper plate 3! An I-impact weapon 4546 is provided. The shock absorbers 45 and 46 come into contact with the main bodies 45a and 46a fixed to the lower plate 5 and the upper plate 3. It consists of contact parts 45b and 46b.

A high viscosity liquid is sealed in the bodies 45a, 46a, and the buffers 45, 46 are connected to the bodies 45a, 46a and the contact portion 45.
b, 46b horizontally and above.

When a relative displacement occurs in the downward direction, viscous resistance is generated by the high viscosity liquid, and vibrations input to the lower plate 5 are damped.

Here, when the placed object 2 is placed at a position shifted from the center position of the upper plate 3, or when the placed object 2 is placed at the center of the upper plate 3, but due to the peculiar shape of the placed object 2, A case where the center of gravity is offset will be explained.

In this way, if the center of gravity of the object 2 is shifted from the center of the upper plate 3, each spring unit 11a1 to 11a3, 1
1b1~11b3.11C1~11G3, 11d+~1
The load does not act equally on the spring units 1d3, and a larger load acts on the spring unit 11 whose center of gravity is closer. Therefore, the upper plate 3 is tilted due to uneven displacement of the spring unit 11.

Here, the spring unit 11 is moved so that the upper plate 3 becomes horizontal. A spirit level 47 (47a) is installed on all sides of the upper plate 3.
~47d) are installed.

The spring unit 11 provided on the raceway surfaces 9a, 10a of the horizontal member 9.10 is slid while observing the scale of the level (478-47d). For example, as shown in FIG. 1, a case will be described in which the object 2 is placed at a position closer to the left side of the upper plate 3 (in the direction of arrow x1).

In this case, since the center of gravity of the object 2 is shifted to the left from the center of the upper plate 3, the spring unit 11at is provided on the left half of the intermediate base 6.

1182.11C2, 11C3, 11d+.

11dz, a larger load acts on 11dz.

Therefore, the spring units 11az, 11a3 and 11C
+, 1102 to the left (
1 direction).

In this way, when the upper plate 3 is tilted in the direction of the arrow X+, :Xz force, the spring unit 11, which is movable in that direction, is moved to the vicinity of the center of gravity of the object 2 to be placed. Then, each spring unit 11 is stopped at a position where the levels 47a to 476 indicate the horizontal position.

Further, the spring force after movement of the spring units 11 is adjusted by turning the nuts 17 and 18 of each spring unit 11.

In this way, the horizontality of the upper plate 3 can be easily adjusted as described above even at the installation site. In addition, although the upper plate 3 is made horizontal, the air support portions 198 to 198 that support the intermediate base 6
A larger load acts on the ripple n object 2 closer to its center of gravity 19d.

Therefore, the gap between the orifice member 33 of the air support member 19 and the support plate 26 varies depending on the arrangement position, and the intermediate base 6 is inclined.

Further, the support plate 26 is inclined with respect to the upper surface of the oriSwiss member 33, and a uniform air layer 25 is not formed, which may cause vibrations or irregularities.

Such an inclination of the intermediate base 6 is determined by the inclination of each air support member 19a.
This can be corrected by changing the screw-in amount of the bolts 29 and 41 of ~19d.

Further, fine adjustment of the inclination of the intermediate base 6 can be made by using the piping 20a to 20d.
This is corrected by adjusting the degree of constriction of the variable restrictors 22a to 22d provided in the air support members 198 to 19d and resetting the air pressure supplied to each air support member 198 to 19d. Note that a spirit level 4 similar to that of the upper plate 3 is provided on the side surfaces of the horizontal members on the four sides of the intermediate base 6.
8a to 48d are provided. Therefore, each level 488~
The intermediate base 6 is made horizontal by adjusting the aperture opening degrees of each of the variable apertures 22a to 22d while looking at the scale 48d.

In this way, the center of gravity of the heavy object 2 is located on the upper plate 3.
Even if the upper plate 3 is shifted from the center of the vibration isolator, the upper plate 3 can be adjusted to a horizontal position by simply moving the spring unit 11 according to the inclination, and the intermediate base 6 can also be adjusted to maintain the horizontal position. 1 is capable of effectively isolating external vibrations and stably supporting the object 2 regardless of the deviation of the placement position of the object 2 and the position of the center of gravity.

Note that in the above description, the intermediate base 6 is referred to as the air support member 19a.
~ 19d, and the upper plate 3 is supported by a plurality of spring units 11, but the structure is not limited to this. For example, the intermediate base 6 can be supported by the spring units 11, and the upper plate 3 can be supported by the air support member 19. It may be supported. in this case,
The air support member 19 may be provided so as to be movable on the intermediate base 6.

Effects of the Invention As described above, the vibration isolator according to the present invention allows the spring means or air support means for supporting the upper plate to be attached to the object even when the center of gravity of the object is shifted from the center of the upper plate. By moving the top plate close to the center of gravity, the top plate can be easily adjusted to a horizontal position at the installation site, and by correcting the top plate so that it does not tilt depending on the center of gravity of the object being placed, good vibration isolation can be achieved. It has the advantage of being 1q more effective and being able to more stably support the placed object.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view for explaining one embodiment of the vibration isolator according to the present invention, Fig. 2 is a plan view of the vibration isolator, and Fig. 3 is a side view of the vibration isolator seen from the left. , Fig. 4 is a side sectional view of the vibration isolator seen from the right side, Fig. 5 is a longitudinal sectional view for explaining the spring unit, Fig. 6 is a longitudinal sectional view of the air support member, and Fig. 7 is a longitudinal sectional view of the air support member.
The figure is a plan view of the air support member. 1... Vibration isolator, 3... Upper plate, 5... Lower plate, 6...
...Intermediate base, 7a-7d...Frame, 8a-8
d... Contact portion, 9.10... Horizontal member, 9a, 10
a... Raceway surface, 11... Spring unit, 12...
Opening plate, 13゜14...Coil spring, 15.16...
・Spring holder, 17° 18... Nut, 19.19a~
19d...Air support member, 20a-20d...Piping, 21...Air source, 22a-22d...Variable throttle.

Claims (3)

[Claims] (1) A pair of bases consisting of an upper base on which an object is placed and a lower base opposite to the base, and one end of which is in contact with either one of the pair of bases, a spring means for absorbing vibrations; and a spring means provided between the other end of the spring means and another base, which is slidable relative to the other base via an air layer of a predetermined pressure, and supports the load of the placed object. a vibration isolator having an air support means that moves one of the spring means or the air support means that comes into contact with the upper base according to the position of the center of gravity of the object to be placed with respect to the upper base; A vibration isolator characterized in that it can be freely installed. (2) The vibration isolator according to claim 1, wherein one of the spring means and the air support means is movably provided on an intermediate base interposed between a pair of bases. Device. (3) The other of the spring means or air support means is provided between the lower base and the intermediate base, and maintains the intermediate base horizontally by varying the supporting force that supports the intermediate base. The vibration isolator according to claim 2, characterized in that: