JPS5940038A - Inertial vibration damping device equipped with overdrive mechanism - Google Patents

Abstract

PURPOSE:To contrive to downsize and to save weight by a method wherein an inertial body arranged between two screw rods, which are rotatably supported between a main tube and an auxiliary tube and the pitches of which are different from each other, in the device to protect apparatuses in piping system or the like from earthquake and the like. CONSTITUTION:A first ball and nut member 3 is fixed on the auxiliary tube 2 at its end inserted in the main tube 1, while a second ball and nut number 4 is fixed on the main tube 1 at its intermediate part. The first screw rod 5 is screwed in the first nut 3, while the second screw rod 6 is screwed in the second nut 4. The first and second screw rods 5 and 6 are coupled integrally with each other within an inertial body 7. Because the pitch of the second screw rod 6 is made finer than that of the first screw rod 5, the inertial body 7 can be overdriven, resulting in downsizing the overdrive mechanism and in saving the weight thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a vibration damping device for protecting piping systems and other equipment in generators, chemical plants, etc. from vibrations caused by vibrations.

Conventionally, this type of allocation device has been used to control 4) objects and... +
An inertial vibration damper that converts the relative reciprocating motion in the direction of the ligament at the time into a rotating shaft using a nut and threaded rod that match each other 11 bases, transmits this rotational motion to the eccentric body, and uses the inertia to brake it. The device is known. Furthermore, a mechanism for increasing the speed of the threaded rod's rotation 11g is incorporated into such a vibration damping device, thereby reducing the size of the tll body and also suppressing low cycle vibrations. A device that can respond to the r-sensation has been proposed.

However, when incorporating a speed increasing mechanism inside, it is inevitable that the situation will become more complicated. Therefore,
It is desirable to have a speed increasing mechanism that can provide a relatively large speed increasing ratio with a small hoe.

Therefore, the present invention provides a small-sized, small-sized 4J vibration damping device with a built-in speed increasing mechanism that can obtain a relatively large speed increasing ratio.
The purpose is to provide

The invention will now be described in detail with reference to the figures. The main cylinder 1, which is one of the supporting members, has a handle 1a on the lid at one end, and can be connected to an assigned object such as a W building or a piping system via this.

The auxiliary cylinder 2, which is the other supporting member, is inserted into the main cylinder 1 at its inner side so as to be freely removable in the axial direction, and has a handle 2a at its outer end. The sub-tube 2 is connected to a construction or an object to be allocated via a handle 2a.

A first pole nut 3 is fixed to the inner part of the main cylinder 1 of the secondary cylinder 2, and a hole nut 4 of the bow 2 is fixed to the middle part of the main cylinder 1.
is fixed.

In the first nut 3, the first nut 4.5 is 111-
A second threaded rod 6 is fitted to the nut 4 of the bowl 2 and is movable in the axial direction within the main cylinder 1. The draw rods 5 and 6 of the coffins 1 and r,)2 are connected to each other within the inertial body 7 and are integral.

Next, the action will be explained. This damping method is used by connecting either the simple 1 or the sub-tube 2 to the object, and the external force is connected to the object to be allocated. If a slow relative displacement occurs due to a change in temperature, the first and second screws hp: 5.

6 is slowly rotated integrally with the inertial body 7, and this is allowed without difficulty.

On the other hand, if a high acceleration displacement occurs between the damping target and the structure due to ground contact, etc., due to the 114 property, the tension rods 5, 6
The inertial body 7 cannot follow the rotation of the oscilloscope, and this causes a large reaction force against the vibration.

In this case, the rotation speed of the tightening rods 5 and 6 is increased compared to the case where a single tightening rod is rotatably supported on the main cylinder and the nut of the sub-cylinder is pulled together with the single tightening rod. . That is, for example, I'
Pl the pitch of threaded rod 5 of No. 4 1, 2) Threaded rod 6 of 32
If the pitch of is P2, and PI>P2, when the nut 3 of the can and the first screw rod 5 move relative to each other by PH, the screw rods 5 and 6 rotate together by 1, and 42 relative to the nut 4 in the axial direction by P2. Therefore, in order to rotate the threaded rods 5 and 6 once, the first nut 3 must be replaced by the second nut 4. In other words, the rotation speed of the single tension rod is increased.

Note that the present invention is not limited to the above-described embodiments; for example, an inertial body may be indirectly connected to a threaded rod, and the inertia of this inertial body may be used to activate a friction brake;
In addition to the above, various known vibration damping devices using rotating inertia bodies;
It is possible for if.

As explained above, the present invention provides oak h4, 3
3. The nuts of the main cylinder 1 and the sub cylinder 2, which are the supporting parts provided with.
4 are screwed together with 41 and second threaded rods 5, 6, which are integral with each other, and the relative f between the threaded rods 6, 6 and nuts 3, 4 is screwed together.
In the 8th example, the inertial body 7 on the tension rod 5°6 is rotated at an increased speed using the rdI structure, so that the speed increasing mechanism can be made smaller and lighter, and it is possible to obtain a relatively large acceleration ratio. .

[Brief explanation of drawings]

The drawing shows an example of the implementation of the present invention (it is a new blood diagram. 1...Main cylinder, 2...Secondary cylinder, 3...-+, T
Natsuto of I, 4...>ig Natsuto of 2, 5...
・・First threaded rod, 6 ・・・Second threaded rod, 7...
1fS4 body. Patent applicant Sanwa Tetsuki Co., Ltd.

Claims (1)

[Claims] one support member connected to the camera or the construction;
The other support member that is attached to the structure or allocation target;
Uniform CI nuts 1 to 2 fixed to the other support member, v-2 nuts fixed to one support member, and mutually coupled nuts 1 to 2 fixed to the first and second nuts, respectively. 1
a rolling pin and a second rolling pin having a smaller pitch;
An inertia-controlled JIK' device with a speed increasing mechanism, which is equipped with an iM elastic body that is connected to or indirectly connected to the draw rod of ', 141 and ε [32].