JP2016183693A - Remote monitoring device for pipe vibration-proof unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide means for confirming a relative displacement of a rod in respect to a cylinder member at a remote position without going to their installation site.SOLUTION: A remote monitoring device 1 for detecting a relative displacement amount of a rod in respect to a cylinder of a hydraulic vibration restrictor and detecting a displacement of a pipe comprises a rotary mechanism 3 for converting a linear relative displacement of the rod into a rotary displacement, a potentiometer 9 for generating an electrical output corresponding to a rotary displacement of this rotary mechanism 3, a detecting circuit 10a for generating an alert signal at a prescribed threshold of output of this potentiometer 9 and a communication instrument 4 for transmitting this alert signal of the detecting circuit 10. The rotary mechanism 3 includes a pulley 6 for feeding out a working wire in response to a rod feeding-in or feeding-out motion of the rod and winding-up while it is rotationally biased in a direction in which a wire 7 fixed to the rod is wound up. The potentiometer 9 rotating with the pulley 6 generates a voltage output in response to the rotary displacement and causes the detecting circuit 10a to output the alert signal.SELECTED DRAWING: Figure 2

Description

  The present invention provides a vibration isolator that supports piping in a nuclear power plant, a thermal power plant, a chemical plant, etc. on a support such as a structure, and allows slow movement of the piping against thermal displacement, etc., while damping vibration caused by an earthquake or the like. The present invention relates to one that detects the stroke position of the rod and prevents excessive displacement of the piping.

  Conventionally, a hydraulic vibration isolator has a cylinder tube and a piston rod that is movably inserted into the cylinder tube, and is attached between a vibration isolating object and a structure to linearly displace both in vibration. There is one that performs anti-vibration action by hydraulic pressure (Patent Document 1). This hydraulic vibration isolator is provided with a lock device for fixing the rod at a predetermined relative position with respect to the cylinder tube for attachment to the pipe. The locking device fixes one end of the indicator having a length scale to the rod, extends the other end to the cylinder tube in the moving direction of the rod, moves the indicator along the guide member fixed to the cylinder tube, The guide member is aligned with a predetermined scale position of the indicator and locked with a butterfly bolt to fix the rod. While attaching the vibration isolator with the rod fixed, the rod can be moved freely by loosening the butterfly bolt and releasing the restraint of the indicator after installation. The amount of displacement of the rod accompanying the displacement of the object to be shaken can be read with the indicator scale. In addition, the indicator strokes the rod stroke position simply by coloring the normal operation range, caution range, and stroke limit boundary on both sides, centering on the stroke position of the rod when the hydraulic vibration isolator is installed. What can be visually confirmed is actually used.

JP-A-10-196707

In the conventional hydraulic vibration isolator, in order to check whether it is operating normally, it is necessary to go directly to the installation site and visually check the indicator. For example, facilities in power plants require seismic hydraulic vibration isolators, and many hydraulic vibration isolators are installed especially for piping systems. A lot of time and labor are consumed, and the burden of maintenance is great. In addition, depending on the operating conditions of the power plant and the vibration isolator of the hydraulic anti-vibration device, the installation position may become an inaccessible area, and there may be a case where the check operation of the stroke position cannot be performed in practice.
Accordingly, the present invention provides a remote monitoring of a vibration isolator for piping that confirms the relative displacement of the rod with respect to the cylinder member of the vibration isolator at a remote location without going to the installation site, and monitors the state of the vibration isolator and the object of vibration isolation. An object is to provide an apparatus.

In order to solve the above-mentioned problems, in the present invention, a rod D2 connected to one of a support or a pipe and filled with hydraulic oil inside is connected to a piston that partitions the inside into a hydraulic chamber so that the rod D2 can freely enter and exit. Inserting and connecting the other of the support body or the pipe to the rod D2 suppresses the sudden relative movement of the rod D2 with respect to the cylinder D1 to prevent the vibration of the pipe, while allowing the slow relative movement and heat of the pipe. The remote monitoring device 1 for detecting the displacement of the pipe by detecting the relative displacement amount of the rod D2 with respect to the cylinder D1 in the hydraulic vibration damper D that enables displacement or the like is configured. The remote monitoring device 1 includes a rotating mechanism 3 that converts linear relative displacement of the rod D2 that is displaced together with the pipe with the cylinder D1 into rotational displacement, and a potentiometer 9 that generates an electrical output corresponding to the rotational displacement of the rotating mechanism 3. And a detection circuit 10a that issues a warning signal at a predetermined threshold value of the output of the potentiometer 9, and a communication device 4 that transmits the warning signal of the detection circuit 10a to a remote location.
The communicator transmits the output of the potentiometer to a remote position, and the remote position detection circuit is configured to issue a warning signal at a predetermined threshold value of the potentiometer output.
The rotating mechanism 3 is provided with a pulley 6 that feeds and winds up the operating line in response to the movement of the rod D2 while being urged to rotate in the direction of winding up the operating line such as the wire 7 fixed to the rod D2. .

  In the present invention, it is possible to confirm the stroke position of the hydraulic vibration isolator at a remote position without going to the installation site of the hydraulic vibration isolator, and to check the state of the many hydraulic vibration dampers installed in the power plant. It can be carried out easily without costing, and the cost of the hydraulic anti-vibration device and the maintenance surface of the anti-vibration object can be reduced. Further, even when the installation location of the hydraulic vibration isolator is in a restricted entry area, it is possible to safely confirm the displacement of the vibration isolation target such as the stroke position and piping.

It is a perspective view of the vibration isolator for piping which attached the remote monitoring apparatus which concerns on this invention. It is the front view which notched some remote monitoring apparatuses of FIG. It is the side view which notched some remote monitoring apparatuses of FIG. It is a disassembled perspective view of the remote monitoring apparatus of FIG. It is the top view which notched a part of rotation mechanism. It is a disassembled perspective view of a rotation mechanism.

An embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, a hydraulic vibration isolator D has one end connected to a support such as a structure, and is slidably inserted into a cylinder D1 filled with hydraulic oil and partitioning a hydraulic chamber in the cylinder D1. The piston is coupled to one end, and is inserted into the cylinder D1 so as to freely enter and exit, and the other end includes a rod D2 connected to a pipe that is the object of vibration isolation. The hydraulic vibration isolator D suppresses a sudden relative movement of the rod D2 with respect to the cylinder D1 to prevent vibrations such as earthquakes, while allowing a slow relative movement of the rod D2 and does not hinder displacement due to a temperature change of the pipe. .

  A remote monitoring device 1 that detects an abnormal operation by detecting the stroke position of the rod D2 is attached to the side of the hydraulic vibration isolator D. The remote monitoring device 1 includes a rotation mechanism 3, a potentiometer 9, a detection circuit 10a, and a transmission unit 4 in a rectangular case 2 fixed to the side surface of the cylinder D1.

  As shown in FIGS. 2 to 6, the rotating mechanism 3 is horizontally disposed between a frame body 5 having a pair of upper and lower frame plates 5a and 5b fixed in the case 2 and the frame plates 5a and 5b. A pulley 6 that is rotatably supported and on which the wire 7 is wound is provided, and a spring spring 8 that urges the pulley 6 to rotate. The frame 5 includes an upper frame plate 5a fixed by screwing to the side surface of the case 2, and a lower frame plate 5b opposed to each other with three collars 5c interposed therebetween. They are connected by bolts and nuts that pass through. One end of the wire 7 passes through the case 2 and is connected to the fixed flange D3 at the end of the rod D2, and the other end is fixed to the pulley 6, and is fed out from the pulley 6 and wound up according to the stroke of the rod D2. . One end of the spring 8 is screwed to the side surface of the case 2 together with the upper frame plate 5a, and the other end is locked to the protruding cylindrical shaft 6a of the pulley 6 and wound around the protruding cylindrical shaft 6a. The pulley 6 is urged to rotate in the removing direction.

  The potentiometer 9 is mounted on the upper frame plate 5a of the case 2, is coupled to the pulley 6 by the shaft 9a, rotates together, and outputs a voltage according to the rotational displacement, thereby corresponding to the warning position of the stroke of the rod D2. A warning signal is output from the detection circuit 10a at a predetermined threshold.

  As shown in FIGS. 3 and 4, the transmission unit 4 includes a substrate 10 constituting a detection circuit 10 a incorporating a button battery holder and other electric elements, and a wireless module 11 attached to the back surface of the substrate 10. . The battery attached to the button battery holder of the detection circuit 10a on the substrate 10 serves as a voltage output of the potentiometer 9 and a power source for outputting a warning signal to the detection circuit 10a. The wireless module 11 is electrically connected to the detection circuit 10a, transmits a warning signal by the detection circuit 10a, and is separately arranged in a monitoring place such as a remote control management room and receives the warning signal (not shown). A communication device is configured together with the receiver. A rod-shaped antenna 12 fixed to the front plate of the case 2 is connected to the wireless module 11.

  In this remote monitoring device 1, when the rod D2 is relatively displaced with respect to the cylinder D1 of the hydraulic vibration isolator D due to thermal displacement of the pipe, the wire 7 is fed out (wound up) in the rotating mechanism 3 and the pulley. 6 rotates with the rotation of the shaft 9a of the potentiometer 9, and the detection circuit 10a outputs a warning signal if the amount of movement of the rod D2 is a predetermined angular displacement that is near the stroke limit from the caution range. 11 transmits a warning signal to the receiver at the monitoring location, so that the displacement amount of the rod D2 of the hydraulic vibration isolator D can be confirmed even at a remote position, and a countermeasure can be taken quickly. The spring 8 expands and contracts in the rotational direction about the shaft 9 a and biases the pulley 6, so that the amount of displacement of the rod D 2 can be accurately transmitted as the rotational displacement of the pulley 6 by unwinding and winding the wire 7.

  In the previous embodiment, the wireless module 11 constituting the communication device transmits the warning signal of the detection circuit 10a to the remote position. Instead, the wireless module 11 transmits the voltage output of the potentiometer 9 to the remote position. The detection circuit 10a provided with the receiver at the remote position may output a warning signal at a predetermined threshold value of the voltage output of the potentiometer 9.

DESCRIPTION OF SYMBOLS 1 Remote monitoring apparatus 2 Case 3 Rotating mechanism 4 Transmission unit 5 Frame 5a Upper frame plate 5b Lower frame plate 6 Pulley 7 Wire 8 Spring 9 Potentiometer 9a Shaft 10 Substrate 10a Detection circuit 11 Wireless module 12 Antenna 13 Connector D Hydraulic vibration isolator D1 cylinder D2 rod

Claims (3)

A cylinder connected to one of the support or the pipe and filled with hydraulic oil therein, a piston partitioning the hydraulic chamber in the cylinder, and connected to the other of the support or the pipe and coupled to the piston, the cylinder A rod inserted freely from one end of the cylinder to prevent sudden vibration of the pipe by restraining a sudden relative movement of the rod with respect to the cylinder, while allowing a slow relative movement to prevent thermal displacement of the pipe. In the remote monitoring device for detecting the displacement of the pipe by detecting the relative displacement amount of the rod with respect to the cylinder in the hydraulic vibration damper that enables,
A rotating mechanism that converts linear relative displacement of the rod that is displaced together with the pipe to the cylinder;
A potentiometer that generates an electrical output according to the rotational displacement of the rotating mechanism;
A detection circuit that issues a warning signal at a predetermined threshold of the output of the potentiometer;
A remote monitoring device for a vibration isolator for piping, comprising: a communication device for transmitting a warning signal of the detection circuit to a remote position. A cylinder connected to one of the support or the pipe and filled with hydraulic oil therein, a piston partitioning the hydraulic chamber in the cylinder, and connected to the other of the support or the pipe and coupled to the piston, the cylinder A rod inserted freely from one end of the cylinder to prevent sudden vibration of the pipe by restraining a sudden relative movement of the rod with respect to the cylinder, while allowing a slow relative movement to prevent thermal displacement of the pipe. In the remote monitoring device for detecting the displacement of the pipe by detecting the relative displacement amount of the rod with respect to the cylinder in the hydraulic vibration damper that enables,
A rotating mechanism that converts linear relative displacement of the rod that is displaced together with the pipe to the cylinder;
A potentiometer that generates an electrical output according to the rotational displacement of the rotating mechanism;
A communication device that transmits the output of the potentiometer to a remote location;
A remote monitoring device for a vibration isolator for piping, comprising: a detection circuit that issues a warning signal at a predetermined threshold value of the output of the potentiometer at the remote position.   2. The rotating mechanism includes a pulley that draws and winds up an operating line in response to the movement of the rod while rotating and biasing the operating line fixed to the rod in a winding direction. A remote monitoring device for a vibration isolator for piping as described in 1.

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