JPS589857B2 - Vibration isolating device that utilizes rolling and sliding - Google Patents

Description

[Detailed Description of the Invention] The present invention applies to structures where safety is particularly required, such as hazardous materials storage tanks and nuclear power plants, or structures with wheels, such as cranes, when external vibrational forces such as earthquakes and wind vibrations act. This is a vibration isolator designed to reduce vibrations and prevent damage.

Generally, structures are fixed to the ground, so large vibrations occur when they are subjected to vibrational external forces such as earthquakes or wind.

Conventionally, in order to avoid the risk of damage due to vibration, a method of reinforcing the structure by conducting vibration analysis has generally been adopted.

However, this method is not only expensive, but also cannot be used in cases where the wheels of a structure are lifted up.

If you attach a wheel to the plywood of a structure and apply force in that direction, the wheel will roll and release the force from the structure, but it must be stopped somewhere.

Furthermore, if such a device were used to fix the rotation of the wheels so that only slippage would occur, the frictional force would cause the wheel to which the force is applied to rise, and when it falls, a large impact force would be generated.

In order to compensate for the drawbacks of only rolling or only sliding, the present invention first stops the rotation of the wheels after moving a certain distance by rolling, so that the inertia force due to rolling movement exceeds the maximum frictional force of sliding. This is a vibration isolating device that allows the wheels to slide without lifting, releasing force through rolling and absorbing energy through sliding.

This slippage should be stopped by a stopper on the foundation or on the trolley.

Such devices can be used not only for structures with foundations, but also for mobile structures with carts, and rollers may be used as wheels. Generally, they have the following configuration: be.

In other words, between the plywood of the structure and its foundation, or between the structure on a trolley and the trolley, there are rollers or wheels that can roll in the direction of vibration isolation. The fixation by the first stopper is broken by an external force of more than a predetermined amount from the direction, and after falling a predetermined distance, the rotation is restrained by the second stopper and enters a slipping state, and the slipping is caused by the aforementioned foundation. Alternatively, it can be stopped by a third stopper on the cart.

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

FIG. 1 is a front view of an embodiment of a vibration isolator using wheels, and FIG. 2 is a side view thereof.

In particular, the lower wheels 2 and 3 and the upper wheels 10 and 11 have their axes at right angles to each other so that they can absorb external forces in directions perpendicular to each other.

The lower wheels 2, 3 of this set of wheels rest on the rail 1 on the foundation.

A rail 1 is placed on the holding frame 4 of the wheels 2, 3 in a direction perpendicular to the rail 1, and the wheels 10, 11 are mounted on the rail 1.

A structure 18 to be vibration-proofed is placed on the holding frame 12 of the wheel 10.11.
Ganoru.

It is necessary to attach three or more sets of such wheels to one structure 18.

The anti-vibration effect of this device will be explained below with details of its structure.

Here, we will discuss cases where an external vibrational force acts in the left-right direction of Figure 1, that is, in a direction perpendicular to the plane of the paper in Figure 2, and cases where an external vibrational force acts in a direction perpendicular to the plane of Figure 1, that is, in the left-right direction of Figure 2. In order to explain the latter case at the same time, the reference numeral in the figure for the latter case is written in parentheses.

Two wheels 2, 3 (10.11) that handle external force in one direction
One of the wheels 3 (11) is fixed by a fixing pin 5 (13) which is a first stopper, and the other wheel 2 (10
) has a circular cutout, and the cutout has a second stopper, that is, a retainer <4 that is a stopper against rolling.
(Protrusion 6 (14) from 121 is inserted with a margin, and shock absorbing rubber 7 (15) is attached to protrusion 6 (14).

Further, at both ends of the rail 1 (1') there are outer stoppers 9 (17) which are third stoppers, and the contact surfaces thereof also have shock absorbing rubber 8 (16).

A vibrating external force acts in the left-right direction in FIG. 1 (FIG. 2), and when this force exceeds a certain value, the fixing pin 5 (13) breaks, the fixing is released, and the vibration isolator is activated.

This fixing pin normally fixes the wheels 3 (11) to keep the structure 18 in a stable state.

Now, when fixing pin 5 (13) breaks, wheels 2 (10) and 3
(11) rolls freely on rail 1 (1').

Shock absorbing rubber attached to 4 (12) that will hold when rolled a certain distance? (15) The cut portion of the wheel 2 (10) hits the protrusion 6 (14) which is a rolling stopper and cannot rotate, causing slippage between the rail [1') and the wheel 2 (10).

At this time, the wheels 3 (11) continue to roll, reducing the sliding friction force.

Further, when the holding bar <4 (12) moves, the holding bar hits the outer stopper 9 (17), which is a third stopper having shock-absorbing rubber 8 (16), to prevent the device from losing stability.

Even if the direction of the external vibrational force changes to the opposite direction, rolling and sliding occur in the same order.

In this way, external forces such as cutting, rolling, slipping, and stopping of the pin 5 (13) are gradually absorbed, and the purpose of vibration isolation is achieved.

Fig. 3 is an example using a roller, and a is a side view thereof;
b is its front view.

The rollers 20 and 21 have fan-shaped notches on their sides,
Here is the bar 22 which is the second stopper.
enters.

The bar 22 connects the two rollers 20 and 21 with its axis, and also serves as a frame.

19 is a guide for a pair of rollers on the foundation, 23 is a structure, and 24 is an outer stopper.

Rollers 20 and 21 differ in the width of the fan-shaped cut.
0 enters sliding first, and then 21 enters sliding as well, making the operation smooth.

Others are the same as those shown in FIGS. 1 and 2.

FIG. 4 shows an embodiment in which the device of the present invention is used in the transverse direction of a crane wheel section, in which a is a side view and b is a front view.

In this crane, wheels 26 are rotated by a drive device 29,
Runs on rail 27.

The rail 3 is mounted in the transverse direction on the wheels 25, 26 and the holding frame 28.
0, wheels 31, 32, outer stopper 35, holding <33
, install a vibration isolator consisting of a roll stopper 34.

The structure above the vibration isolator varies depending on the size of the crane, but equalizers 36, 38 or one leg 37 of the crane are attached.

In the structure shown in FIG. 4, the number of wheels of the vibration isolator is equal to the number of running wheels, so the wheels of the vibration isolator can have the same strength and dimensions as the running wheels.

Fig. 5 shows an embodiment in which a spherical tank is supported by the two-way vibration isolator of the present invention (the one shown in Figs. 1 and 2), and a is its front view;
b is a plan view.

The spherical tank 40 is fixed to the foundation via four vibration isolators 39.

Figure 6 shows the frequency response with and without this device.
/5 to 1/100.

In this explanation, the first stopper is a fixed pin, but it may also be a brake.

[Brief explanation of drawings]

FIGS. 1 and 2 show a vibration isolating device using wheels, and FIG. 1 is a front view, taken in the direction of arrow II in FIG. Figure 3 shows a vibration isolator using rollers, a is a side view, b is a front view, Figure 4 is an example of a crane, a is a side view, b is a front view, and Figure 5 is an example of a spherical tank. In FIG. 6, a is a side view, b is a plan view, and FIG. 6 is an example of a frequency response curve when using the device of the present invention. 1, 1'...Rail, 2...Wheel with rolling stopper, 3...Wheel with fixing pin, 4...Holding frame, 5...fixing pin, 6...Rolling wrist stopper, 7...Shock absorbing rubber, 8...Shock absorbing rubber, 9
...Outer stopper 1, 10...Wheel with rolling stopper, 11...
Wheel with fixing pin, 12... Holding frame, 13... Fixing pin, 1
4... Rolling stopper, 15... Shock absorbing rubber, 16... Shock absorbing rubber, 17... Outer stopper, 18... Construction, 19...
Guide, 20... Roller with rolling wrist stopper, 21... Roller with one rolling stopper, 22... Roller fixing beam, 23... Upper guide,
24... Outer stopper, 25... Running wheel, 26... Drive wheel, 27... Running rail, 28... Running wheel bogie, 29... Drive device, 30... Rail, 31... Wheel with rolling stopper,
32... Wheel with fixed pin, 33... Holding frame, 34... Rolling stopper, 35... Outer stopper, 36... Equalizer, 37... Crane leg, 38... Equalizer, 39...
Two-way vibration isolator, 40...spherical tank.

Claims (1)

[Claims] 1. Place rollers or wheels that can roll in the direction of vibration isolation between the plywood of the structure and its foundation, or between the structure on a trolley and the trolley. The fixation by the first stopper is broken due to an external force of more than a predetermined amount from the direction, and then the second stopper falls over a predetermined distance.
A vibration isolating device utilizing rolling and sliding, which is restrained from rolling by a stopper and enters a sliding state, and the sliding is stopped by a third stopper on the foundation or the truck.