JPH0389039A - Capstan type damping device - Google Patents

Abstract

PURPOSE:To correspond to any degree of expansion caused by the heat change of piping without hindrance by providing a capstan type damping device with an inner cylinder with a slotted hole perforated therein, removably inserted into an outer cylinder with a friction rod rigidly secured thereto, and wire ropes locked at one lid of the inner cylinder, wound around the friction rod at the center part and tension-adjustably locked at the other lid. CONSTITUTION:A friction rod 2 is rigidly fixed at the center part of an outer cylinder 1. An inner cylinder 3 is slidably inserted into the outer cylinder 1 and provided with a slotted hole 3c perforated therein so as to allow the friction rod 2 to pass freely. Wire ropes 4 are locked at the lid 3b at one ends thereof, and after being wound around the friction rod 2, tension-adjustably locked at a lid 3a at the other ends. At the time of using this capstan type damping device connecting one trigger to piping and the other trigger to a structure, the tension of the wire ropes is previously adjusted by anchor fittings 5 so as to allow the displacement of the piping caused by heat change with appropri ate frictional resistance. At the time of earthquake, capstan action is generated by the sudden reciprocating motion of the wire ropes 4, thereby generating sudden increase in resistance to perform damping.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration damping device that protects piping in a plant from sudden vibrations such as earthquakes.

[Prior art] Piping vibration damping devices include: (1) Slow displacement of pipes due to temperature changes does not cause a slope. (2) Sudden vibrations due to earthquakes etc. cause a slope. (3) Almost maintenance-free devices. It is necessary to meet the following conditions. On the other hand, three types are currently known: a spring type, a hydraulic type, and a mechanical snapper type, but only the mechanical snapper type satisfies the above three conditions. However, the high cost due to structural reasons is an obstacle to widespread use.

For this reason, the idea was completely different from the above, and a structure was developed in which a highly elastic mild steel plate, etc. was used, one end of which was connected to the pipe, and the other end of which was connected to the structure, and the vibration energy was absorbed by the plastic deformation of the plate. -146929. However, it is difficult to use this structure effectively unless the length of the expansion/contraction stroke of the piping due to thermal changes falls within an appropriate range.

Measures to solve problem E] An outer cylinder and an inner cylinder that can be moved in and out relatively are used, a friction rod is fixed to the outer cylinder along the diameter line, a long hole is bored in the inner cylinder to avoid collision with the friction rod, and both ends are Wire lobes that are respectively locked to both lids of the inner cylinder are engaged with this zero-rubbing rod. That is, the vibration is damped by the frictional resistance between the wire rope and the friction rod due to the relative movement in and out of both cylinders. A rope with its end wrapped around a locking rod can be pulled out by pulling slowly, but if pulled too quickly, it exhibits high frictional resistance. It is generally known as capstan action, and it is used.

This structure satisfies the three conditions mentioned at the beginning and can accommodate slow expansion and contraction of the piping, regardless of the length of the stroke.

[Example] The drawings will be explained. The device shown in FIG. 1 consists of an outer cylinder 1, a friction rod 2, an inner cylinder 3 and a wire rope 4. The outer cylinder 1 is open at one end and has a lid la with a handle at the other end, and a friction rod 2 is fixed to the center in the diametrical direction. The inner cylinder 3 has a lid 3a and a lid 3b with a handle on both ends, and is slidably inserted into the outer cylinder, and F! A long hole 3c is bored to allow the rubbing rod 2 to pass through freely. One end of the wire lobe 4 is locked to the lid 3b, and after winding the friction rod 2, the other end is locked to the lid 3a so that the tension can be adjusted. A locking fitting 5 is used to lock the lid 3a. The stop fitting 5 has a hole on one side of the cylinder so that a wire lobe can be inserted and crimped, and has a thread cut on the other side to be screwed into the nut 6. This metal fitting 5 is inserted into a hole bored in the lid 3a, and by tightening a nut 6, the tension of the wire lobe can be adjusted. If necessary, a disc spring (not shown) is inserted between the nut 6 and the lid 3a.

In order to avoid mutual contact of the wire ropes wound around the friction rod, it is preferable to use the guide tube 7 shown in FIG. 3. The guide tube 7 has a groove for the wire row 1 spirally carved on its outer periphery, and is inserted and fixed onto the friction rod.

This device is used by connecting one handle to the pipe and the other handle to the structure. At this time, the tension of the wire lobe is adjusted using a stopper so that displacement of the piping due to thermal changes is tolerated with appropriate frictional resistance. In the case of an earthquake, this device adjusted in this manner causes the above-mentioned capstan action due to the rapid reciprocation of the wire rope, rapidly increasing resistance and damping vibrations.

FIG. 4 shows another embodiment. Outer cylinder 1, friction rod 2, inner cylinder 3
The provision of is the same as in FIG.

Wedge rods 8 are arranged in parallel on both sides of the friction rod 2, and both ends of each wedge rod are positioned by spacer plates 9.

The spacer plate 9 is a rectangular plate with a hole in the center, wedge rods 8 are fixed to both sides, and the friction rod 2 is rotatably inserted into the center hole. One end of the plurality of flat rows 110 is locked to the lid 3b, and as shown in FIG. 4, they are engaged with three rods 8, 2, 8 alternately, and the other end is connected to the stopper fitting 5 of the lid 3a. In this case, there are advantages such as the use of a flat rope increases the friction area and eliminates the need for a guide tube.

[Effects] Mechanical snappers are expensive because they have a configuration that requires the use of ball screws, but the present invention has a simple configuration that significantly reduces the price and allows it to be used liberally in the necessary parts of piping. enable. It can handle expansion and contraction due to thermal changes in piping without any problems.

[Brief explanation of drawings]

Fig. 1 is a front view of the present invention, Fig. 2 is an explanatory diagram of the retaining fitting,
FIG. 3 is a front view of the guide tube, and FIG. 4 is a front view of another embodiment. 1...Outer cylinder, 2...Friction rod, 3...Inner cylinder, 4...
・Wire rope, 5... Retaining fitting, 6... Nut,
7...Guide cylinder, 8...-Wedge bar, 9--Spacer plate, 10...Lobe.

Claims (2)

[Claims] (1) An outer cylinder with a lid with a handle at one end and a friction rod fixed diametrically in the center, an inner lid with a long hole drilled through which the friction rod can pass, which is inserted into and out of the outer cylinder. An inner cylinder to which an outer lid is fixed, one end is locked to one lid of the inner cylinder, wound around a friction rod in the center, and the other end is locked to the other lid of the inner cylinder so that the tension can be adjusted. A capstan-type vibration damping device consisting of multiple wire ropes. (2) In the capstan-type vibration damping device according to claim 1, a pair of wedge rods are arranged in parallel with the friction rod on both sides thereof, and a hole is provided so that both wedge rods can be held in a fixed position. A spacer plate is rotatably attached to a friction rod, and multiple wire ropes are alternately engaged with the friction rod and wedge rod.