JP2018159633A - Monitoring device for damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring device for a damper, capable of appropriately monitoring the operation state of the damper.SOLUTION: A monitoring device for a damper 21 including a cylinder part 24 and a shaft part 23a capable of relatively moving from each other in an axial direction, and generating reaction force when the shaft part 23a moves relative to the cylinder part 24 by external force includes a recording unit 1 integrally provided on an outer surface of the cylinder part 24 and recording a drawn image, and a drawing unit 5 integrally coupled with the shaft part 23a and disposed along the cylinder part 24, and also includes a drawing mechanism 2 for drawing a trajectory of movement of the drawing unit 5 relative to the cylinder part 24 on the recording unit 1.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a damper monitoring device that has a cylindrical portion and a shaft portion that are movable relative to each other in the axial direction, and generates a reaction force as the shaft portion moves relative to the cylindrical portion by an external force.

  Conventionally, for example, a damper disclosed in Patent Document 1 is known as this type of damper. This damper is a rotary inertia mass damper applied to a pedestrian bridge, and includes a screw shaft connected to a girder portion of the pedestrian bridge via a leaf spring, a nut screwed to the screw shaft via a number of balls, and a nut It has a connected rotating mass and a case attached to the sidewalk. The screw shaft, the nut, and the ball constitute a ball screw, and the nut and the rotation mass are accommodated in the case so as not to move in the axial direction with respect to the screw shaft and to be rotatable. Further, the rotary inertia mass damper constitutes an additional vibration system together with the leaf spring.

  In the rotary inertia mass damper having the above-described configuration, when the footbridge vibrates, the relative displacement between the beam portion and the footpath is transmitted to the screw shaft via the leaf spring, and the transmitted relative displacement is applied to the screw shaft and the nut. It is transmitted to the rotating mass in a state where it is converted into a rotating motion by a ball screw including it. Thereby, when a rotation mass rotates, the inertia force by the rotation inertia mass of a rotation mass generate | occur | produces as a reaction force, and the vibration of a footbridge is suppressed.

Patent No. 59159992

  This type of rotary inertia mass damper and cylinder type viscous damper, such as a cylinder part and a damper having a shaft part that can move relative to each other in the axial direction, that is, the shaft part moves relative to the cylinder part by an external force. Accordingly, in a damper that generates a reaction force, it is preferable to monitor the operation state of the damper, such as the movement state of the shaft portion, in order to ensure an appropriate function. Patent Document 1 described above does not disclose anything about this point, and an apparatus capable of appropriately monitoring the operation state of the damper has been desired.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a damper monitoring device capable of appropriately monitoring the operation state of the damper.

  In order to achieve the above object, the invention according to claim 1 includes a cylindrical portion and a shaft portion that are movable relative to each other in the axial direction, and the shaft portion moves relative to the cylindrical portion by an external force. A damper monitoring device that generates a reaction force in connection therewith, and is integrally provided on the outer peripheral surface of the cylindrical portion, and is integrally connected to the recording portion on which the drawn image is recorded and the shaft portion, and the cylindrical portion And a drawing mechanism for drawing a trajectory of the movement of the drawing unit relative to the tube unit on the recording unit.

  In the damper to which the present invention is applied, the cylindrical portion and the shaft portion can move relative to each other in the axial direction, and the reaction force is generated as the shaft portion moves relative to the cylindrical portion by an external force. . Further, according to the present invention, the recording unit for recording the drawn image is integrally provided on the outer peripheral surface of the cylinder unit, and the drawing unit of the drawing mechanism is integrally connected to the shaft unit, and the cylinder unit It is arranged along the part.

  As described above, since the drawing portion arranged along the cylindrical portion is integrally connected to the shaft portion, when the shaft portion moves in the axial direction with respect to the cylindrical portion, the drawing portion is integrally formed with the shaft portion. It moves in the axial direction relative to the part. For this reason, the locus of movement of the drawing unit relative to the cylinder part appropriately represents the movement state of the shaft part relative to the cylinder part. According to the present invention, since the locus of movement of the drawing portion relative to the cylinder portion is drawn and recorded in the recording portion, the movement state of the shaft portion is determined using the locus of movement of the drawing portion recorded in the recording portion. It is possible to appropriately monitor the operation state of the damper including the damper.

  According to a second aspect of the present invention, in the damper monitoring device according to the first aspect, the drawing mechanism is provided integrally with the shaft portion and extends from the shaft portion in a direction intersecting the axial direction of the shaft portion, and the base portion And a support part extending along the cylinder part from the base part, and the drawing part is provided on the support part and is configured to draw a trajectory of movement relative to the cylinder part in contact with the recording part. It is characterized by being.

  According to this configuration, the drawing mechanism includes the base portion and the support portion that are integral with each other, and the drawing portion described in the description of the invention according to claim 1. The base portion is provided integrally with the shaft portion, extends from the shaft portion in a direction intersecting the axial direction, and the support portion extends from the base portion along the cylindrical portion. In addition, a drawing unit is provided in such a support unit, and the drawing unit is configured to draw a trajectory of movement with respect to the cylinder unit while being in contact with the recording unit.

  As is apparent from the above configuration, the drawing unit is integrally connected to the shaft unit via the base and the support unit, and is arranged along the cylinder unit, and the locus of movement of the drawing unit relative to the cylinder unit is The image is drawn and recorded in a contact state on the recording unit. Therefore, the above-described effect of the invention according to claim 1, that is, the effect that the operation state of the damper can be appropriately monitored can be effectively obtained.

  According to a third aspect of the present invention, in the damper monitoring device according to the second aspect, the drawing mechanism further includes a biasing unit that biases the drawing unit toward the recording unit.

  According to this configuration, since the drawing portion is biased toward the recording portion by the biasing means, even when the shaft portion of the damper vibrates as it moves relative to the cylindrical portion by an external force, The drawing unit can be prevented from moving away from the recording unit, and the locus of movement of the drawing unit relative to the tube unit can be drawn in a state where the drawing unit is in proper contact with the recording unit.

  According to a fourth aspect of the present invention, in the damper monitoring device according to the second or third aspect, the recording unit is configured by a sheet material including a paper material, and the drawing unit is configured by a pencil, The lead is in contact with the recording portion.

  According to this configuration, since the recording unit and the drawing unit are configured using a sheet material including a paper material and a pencil, the monitoring device can be manufactured at a relatively low cost.

  According to a fifth aspect of the present invention, in the damper monitoring device according to any one of the first to fourth aspects, the damper includes a nut that constitutes a ball screw together with a screw shaft as the shaft portion, and a cylindrical shape as the cylindrical portion. A rotary inertia mass damper configured to be coaxially connected to the rotating mass and configured so that the rotating mass rotates with respect to the screw shaft integrally with the nut as the screw shaft moves in the axial direction with respect to the nut. It is characterized by that.

  The damper to which the present invention is applied is a rotary inertia mass damper. In the rotary inertia mass damper, a nut that constitutes a ball screw together with a screw shaft is coaxially connected to a cylindrical rotary mass, and the screw shaft is As the shaft moves in the axial direction, the rotating mass rotates integrally with the nut with respect to the screw shaft. Along with this, an inertial force due to the rotational inertial mass of the rotational mass is generated as a reaction force. Further, the recording portion described in the description of the invention according to claim 1 is integrally provided on the outer peripheral surface of the rotating mass as the cylindrical portion, and the drawing portion is integrally connected to the screw shaft as the shaft portion. Along with the rotating mass.

  As described above, since the drawing portion arranged along the rotating mass is integrally connected to the screw shaft, the rotating mass becomes the screw shaft as the screw shaft moves in the axial direction with respect to the nut by an external force. When rotated, the drawing unit moves in the axial direction integrally with the screw shaft while moving in the circumferential direction with respect to an arbitrary point of the rotating mass, and moves in a spiral shape at the same pitch as the ball screw. For this reason, the trajectory of the spiral movement of the drawing unit with respect to the rotating mass appropriately represents the moving state of the screw shaft and the rotating state of the rotating mass in association with each other. According to the present invention, since the locus of movement of the drawing unit relative to the rotating mass is drawn and recorded in the recording unit, the movement state of the screw shaft and the drawing state are recorded using the locus of movement of the drawing unit recorded in the recording unit. It is possible to appropriately monitor the operation state of the rotary inertia mass damper including the rotation state of the rotary mass.

  According to a sixth aspect of the present invention, in the damper monitoring device according to the fifth aspect, the recording unit includes a plurality of ruled lines extending in parallel with each other in the circumferential direction of the rotating mass and a plurality of extending in parallel with each other in the axial direction of the rotating mass. It is characterized in that a grid-like ruled line consisting of the ruled lines is drawn.

  According to this configuration, a grid-like ruled line composed of a plurality of ruled lines extending in parallel with each other in the circumferential direction of the rotating mass and a plurality of ruled lines extending in parallel with each other in the axial direction of the rotating mass is drawn on the recording unit. As described in the invention according to claim 5, in monitoring the operation state of the rotary inertia mass damper using the locus of movement of the drawing unit with respect to the rotary mass, the moving state of the screw shaft using the grid-like ruled line as a scale. In addition, the rotation state of the rotating mass can be monitored easily and more appropriately.

  According to a seventh aspect of the present invention, in the damper monitoring device according to the fifth or sixth aspect, a universal joint is provided at the end of the screw shaft opposite to the rotational mass, and the drawing portion is a screw shaft. It is characterized by being integrally connected to a portion on the rotating mass side with respect to the end portion of.

  According to this configuration, the universal joint is provided at the end of the rotary inertia mass damper opposite to the rotational mass of the screw shaft. In this type of rotary inertia mass damper, when applied to a structure in order to suppress vibration, the screw shaft is connected to the structure via this universal joint, and the displacement caused by the vibration of the structure is the universal joint. Is transmitted to the screw shaft. The reason for adopting such a configuration is as follows.

  In other words, depending on how the structure vibrates, the direction of displacement of the input structure may not be completely coincident with the axial direction of the rotary inertia mass damper (screw shaft), but is inclined with respect to the axial direction. There is. In such a case, the universal joint is rotated with respect to the screw shaft and the rotating mass so that only the axial component of the displacement of the structure is transmitted to the screw shaft. For this reason, if the drawing unit is connected to the universal joint, the drawing unit is connected to the universal joint when the direction of displacement of the input structure is oblique to the axial direction of the rotary inertia mass damper. Together, it may rotate with respect to the screw shaft and the rotation mass, so that the locus of movement of the drawing unit may not be properly drawn on the recording unit.

  On the other hand, according to the present invention, the drawing portion is integrally connected to the portion of the screw shaft closer to the rotary mass than the end portion of the screw shaft provided with the universal joint. As described above, even when the universal joint rotates with respect to the screw shaft and the rotating mass, this configuration allows the movement of the drawing unit relative to the rotating mass to be appropriately drawn on the recording unit, and thus the claim. Effectively obtaining the effect of the invention according to Item 5, that is, the operation state of the rotary inertia mass damper can be appropriately monitored using the locus of movement of the drawing unit drawn on the recording unit. Can do.

  According to an eighth aspect of the present invention, in the damper monitoring device according to any one of the fifth to seventh aspects, when the axial load acting in the axial direction of the rotary inertia mass damper reaches a predetermined limit load, A limiting mechanism is provided for limiting the axial load below the limiting load by limiting the transmission of torque between the rotating mass and the nut.

  The rotary inertia mass damper to which the present invention is applied is provided with a limiting mechanism. When the axial load acting in the axial direction of the rotary inertia mass damper reaches a predetermined limit load, the transmission of torque between the rotating mass and the nut is limited by the limit mechanism, so that the axial load is less than the limit load. Limited to

  In this way, when the limiting mechanism is activated when the axial load reaches a predetermined limiting load, the transmission of torque between the rotating mass and the nut is limited, so the amount of movement in the axial direction of the screw shaft due to external force is limited. The amount of rotation of the rotating mass becomes smaller or larger than when the limiting mechanism is not operating. As a result, the trajectory of the drawing portion relative to the rotating mass when the limiting mechanism is activated draws a spiral trajectory in the same manner as when the limiting mechanism is not activated, but when the limiting mechanism is not activated. With respect to the trajectory of the movement of the drawing unit relative to the rotating mass, there is a slight angle deviation (see FIG. 8 described later). Therefore, it is possible to appropriately monitor the presence or absence of the operation of the limiting mechanism of the rotary inertia mass damper using the movement trajectory of the drawing unit drawn on the recording unit.

It is a figure which shows roughly the monitoring apparatus by 1st Embodiment of this invention with the rotary inertia mass damper to which this is applied. It is sectional drawing which shows the rotary inertia mass damper of FIG. It is a figure which shows a monitoring apparatus and a rotation inertia mass damper. It is a figure which expands and shows the cross section which follows the IV-IV line of FIG. It is an enlarged view which shows a recording sheet and a part of a support part of a monitoring apparatus, a pencil, a holder, etc. partially broken. It is an enlarged view which shows a part of support part of a monitoring apparatus, a pencil, a holder, etc. from the recording sheet side. It is a figure which shows the operating state of a monitoring apparatus. It is a figure which expands and shows the locus | trajectory of the movement of the pencil drawn on the recording sheet about the case where it act | operates from the state which the restriction | limiting mechanism of a rotary inertia mass damper is not act | operating. It is a figure for demonstrating that the maximum value of the relative displacement input into the rotary inertia mass damper can be grasped | ascertained using the locus | trajectory of the movement of the pencil drawn on the recording sheet. It is a figure which shows roughly the monitoring apparatus by 2nd Embodiment of this invention with the viscous damper to which this is applied.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows a monitoring device according to a first embodiment of the present invention together with a rotary inertia mass damper 21 to which the monitoring device is applied. In FIG. 1, for convenience, the reference numerals of some components are omitted. Since the rotary inertia mass damper 21 is configured in the same manner as that disclosed in Japanese Patent Application No. 2012-158921 proposed by the present applicant, first, the rotary inertia mass damper 21 will be briefly described.

  As shown in FIGS. 1 and 2, the rotary inertia mass damper 21 includes an inner cylinder 22, a ball screw 23, a rotary mass 24, and a limiting mechanism 25. The inner cylinder 22 is made of a cylindrical steel material. One end portion of the inner cylinder 22 is open, and the other end portion is attached to the first flange 26 via a universal joint UJ having a friction that does not rotate with the torque generated by the rotary inertia mass damper 21. . In FIG. 2, the monitoring device is not shown for convenience.

  The ball screw 23 includes a screw shaft 23a and a nut 23c that is screwed to the screw shaft 23a via a large number of balls 23b. One end of the screw shaft 23a is accommodated in the opening of the inner cylinder 22 described above, and the other end of the screw shaft 23a has a friction that does not rotate with the torque generated by the rotary inertia mass damper 21. It is attached to the 2nd flange 27 via. The nut 23c is supported by the inner cylinder 22 via a bearing 28 so as not to move in the axial direction and to be rotatable.

  The rotary mass 24 is made of a material having a large specific gravity, for example, iron, and is formed in a cylindrical shape. The rotating mass 24 is rotatably supported by the inner cylinder 22 via a bearing 29 in a state in which the inner cylinder 22 and a portion of the ball screw 23 on the inner cylinder 22 side are covered. And is coaxially connected to the nut 23c. Between the rotating mass 24 and the inner cylinder 22, a pair of ring-shaped sealing materials 30 and 30 are provided. A space formed by the sealing materials 30, 30, the rotating mass 24 and the inner cylinder 22 is filled with a viscous body 31 made of silicon oil.

  In the rotary inertia mass damper 21 configured as described above, when a relative displacement occurs between the inner cylinder 22 and the nut 23c and the screw shaft 23a, the relative displacement is converted into a rotational motion by the ball screw 23. By being transmitted to the rotary mass 24 via the limiting mechanism 25, the rotary mass 24 rotates with respect to the inner cylinder 22 integrally with the nut 23c. The rotation of the rotary mass 24 is attenuated by the viscous body 31 between the inner cylinder 22 and the rotary mass 24. Hereinafter, the operation of the rotary inertia mass damper 21 that converts the relative displacement between the inner cylinder 22 and the screw shaft 23a into the rotary motion of the rotary mass 24 in this way is referred to as “rotational conversion operation of the rotary inertia mass damper 21”.

  The limiting mechanism 25 limits the rotational conversion operation of the rotary inertia mass damper 21 and is composed of a plurality of rotary sliding members 25a, screws 25b, and springs 25c (only two are shown). The rotating sliding material 25a is disposed between the rotating mass 24 and the nut 23c, and a plurality of spring accommodating holes 24a are formed in the portion of the rotating mass 24 where the rotating sliding material 25a is disposed. These spring accommodation holes 24a are arranged at equal intervals in the circumferential direction and penetrate in the radial direction. A screw 25b is screwed into each spring accommodating hole 24a, and a spring 25c is accommodated between the screw 25b and the rotary sliding member 25a.

  With the above configuration, when the screw 25b is strongly tightened, the rotating sliding member 25a is strongly pressed against the nut 23c by the urging force of the spring 25c, so that the rotating mass 24 is integrally connected to the nut 23c via the rotating sliding member 25a. It will be in the state.

  Further, when the screw 25b is loosened from this state, the tightening degree is lowered, and the load acting in the axial direction of the rotary inertia mass damper 21 (hereinafter referred to as “axial load”) depends on the tightening degree of the screw 25b. The rotating mass 24 rotates integrally with the nut 23c until a predetermined limit load is reached. On the other hand, when the axial load of the rotary inertia mass damper 21 reaches the limit load, a slip occurs between the rotary sliding member 25a and the nut 23c or the rotary mass 24, and thus the torque between the nut 23c and the rotary mass 24 is increased. As a result of the limited transmission, the rotational conversion operation of the rotary inertia mass damper 21 is limited. In this state, due to the frictional resistance generated between the rotary sliding material 25a and the nut 23c or the rotary mass 24, the inertial force due to the rotary inertia mass of the rotary mass 24, which has been reduced due to the limitation of the rotation conversion operation of the rotary inertia mass damper 21, is caused. Be compensated.

  The rotary inertia mass damper 21 is applied to, for example, a residential or commercial high-rise building B shown in FIG. 1, and the inner cylinder 22 and the screw shaft 23a are respectively provided on the lower beam BD and the upper beam BU of the building B. Connected. In this case, the first flange 26 is attached to the first connection member EN1 slightly extending upward from the lower beam BD, and the second flange 27 is a V-shaped brace-shaped second connection extending downward from the upper beam BU. The rotary inertia mass damper 21 is attached to the member EN2, and extends horizontally between the upper and lower beams BU and BD.

  The horizontal relative displacement between the upper and lower beams BU and BD accompanying the vibration of the building B is transmitted to the rotary inertia mass damper 21, whereby the screw shaft 23 a is connected to the inner cylinder 22, the nut 23 c and the rotary mass 24. When the rotary inertia mass damper 21 is expanded or contracted, the rotary mass 24 rotates integrally with the nut 23c as described above. As a result, an inertial force due to the rotational inertial mass of the rotary mass 24 is generated, whereby the relative displacement between the upper and lower beams BU and BD is suppressed, and consequently the vibration of the building B is suppressed.

  Depending on how the building B vibrates, the relative displacement between the upper and lower beams BU and BD that are input does not completely coincide with the axial direction of the rotary inertia mass damper 21 and is inclined with respect to the axial direction. There is a case. In that case, the first flange 26 and the universal joint UJ are rotated with respect to the inner cylinder 22, and the second flange 27 and the universal joint UJ are rotated with respect to the screw shaft 23a. Of the relative displacement between the beams BU and BD, only the axial component is transmitted to the inner cylinder 22 and the screw shaft 23a.

  Further, when the vibration of the building B becomes large and thereby the axial load of the rotary inertia mass damper 21 reaches the limit load described above, the limit mechanism 25 limits the transmission of torque between the nut 23c and the rotation mass 24. As a result, the rotation conversion operation of the rotary inertia mass damper 21 is limited, and as a result, the axial load of the rotary inertia mass damper 21 is limited to a limit load or less.

  The rotary inertia mass damper 21 may be connected to the upper and lower beams BU and BD so as to suppress the relative displacement in the vertical direction thereof, and may be connected to two other appropriate parts of the building B. Of course, you may. Furthermore, the monitoring device according to the present invention may be applied to a rotary inertia mass damper applied to other appropriate structures such as bridges and steel towers. Of course, the monitoring device according to the present invention may be applied to a rotary inertia mass damper provided in a test device for testing the performance of the rotary inertia mass damper.

  Next, the monitoring apparatus according to the first embodiment will be described with reference to FIGS. 1 and 3 to 9. As shown in FIGS. 1 and 3, the monitoring apparatus includes a recording sheet 1 wound around the outer peripheral surface of the rotary mass 24 of the rotary inertia mass damper 21 and a drawing mechanism 2 integrally connected to the screw shaft 23a. Yes.

  The recording sheet 1 is made of, for example, a sheet material made of paper, and the width thereof is larger than the movable range of the screw shaft 23a with respect to the rotating mass 24 and smaller than the length of the rotating mass 24 in the axial direction. It is set to a predetermined value. On the recording sheet 1, a grid-like ruled line is drawn which is composed of a plurality of ruled lines extending in parallel with each other in the circumferential direction of the rotating mass 24 and a plurality of ruled lines extending in parallel with each other in the axial direction of the rotating mass 24.

  The recording sheet 1 is attached to the outer peripheral surface of the rotating mass 24 using a double-sided tape or the like in a state of being wound around the entire circumferential direction, and is disposed in the central portion of the rotating mass 24 in the axial direction. Yes. Needless to say, the recording sheet 1 may be attached to the rotating mass 24 by another appropriate method. For example, a plurality of screw holes (not shown) for attaching the recording sheet are formed on the outer peripheral surface of the rotating mass, and an insertion hole corresponding to these screw holes is formed in the recording sheet, You may attach by screwing a screw (not shown) in the screw hole of a rotation mass through the insertion hole in the state wound around the outer peripheral surface of the rotation mass.

  The drawing mechanism 2 includes a base 3 and a support 4 that are integral with each other, and a pencil 5 that is provided on the support 4. The base part 3 and the support part 4 are comprised with the plate-shaped metal material which has comparatively high rigidity, and are formed in the L-shape as a whole. Also, one end of the base 3 (the end opposite to the support 4) is integrally connected to the screw shaft 23a through a pair of connecting fittings 6 and 6 (only one is shown in FIGS. 3 and 7). Has been.

  Each of these connecting metal fittings 6 and 6 is formed of a rectangular metal plate, and as shown in FIG. 4, is provided on the engaging portion 6a provided at the center and on both sides of the engaging portion 6a. The first screwing portion 6b and the second screwing portion 6c are integrally provided. The engaging portions 6a and 6a of the pair of connecting fittings 6 and 6 are curved in an arc shape in opposite directions to each other in the thickness direction, and the first screwing portion 6b of each connecting fitting 6 has one An insertion hole (not shown) is formed in the second screwing portion 6c, and two insertion holes (not shown) are respectively formed. Further, two insertion holes corresponding to the insertion holes of the second screwing portion 6 c are formed at one end of the base portion 3.

  A screw shaft 23a is sandwiched between the engaging portions 6a and 6a of the pair of connecting fittings 6 and 6, and the outer peripheral surface of the screw shaft 23a is in contact with the curved surface inside each engaging portion 6a. Yes. Further, an annular spacer 7 is sandwiched between the first screwing portions 6b and 6b in the axial direction, and one end portion of the base 3 is interposed between the second screwing portions 6c and 6c. It is sandwiched in the thickness direction. The length of the spacer 7 is set to the same size as the thickness of the base 3. Moreover, the insertion hole of each 1st screwing part 6b and the hole of the spacer 7 are mutually continuous, The screw 8 is inserted in the hole of these insertion holes and the spacer 7. As shown in FIG. Further, the two insertion holes of each second screwing portion 6c and the two insertion holes of the base portion 3 corresponding thereto are continuous with each other, and a screw 8 is inserted into each insertion hole. A nut 9 is firmly fastened to each of these screws 8, 8, 8.

  With the above configuration, the base 3 is integrally connected to the screw shaft 23a by firmly holding the one end portion of the base 3 and the screw shaft 23a between the pair of connecting fittings 6 and 6, and the screw shaft 23a Extends radially outward. Further, the base 3 is connected to a portion of the screw shaft 23a on the rotating mass 24 side with respect to the other end portion of the screw shaft 23a provided with the universal joint UJ via the connecting metal fittings 6 and 6. Further, the base 3 and the connecting fittings 6 and 6 are arranged at positions where the screw shaft 23a does not interfere with the nut 23c and the rotary mass 24 when the screw shaft 23a moves in the axial direction with respect to the nut 23c and the rotary mass 24. . Further, as is apparent from the above-described configuration, the drawing mechanism 2 including the base 3 can be easily attached to and detached from the screw shaft 23a simply by tightening or loosening the screw 8 to the nut 9.

  The support 4 extends from the other end of the base 3 in the axial direction of the rotary inertia mass damper 21 and extends along the rotary mass 24. As shown in FIGS. 3, 5, and 6, a holder 10 is integrally provided at one end of the support 4 (the end opposite to the base 3). The holder 10 has a cylindrical peripheral wall 10a extending in the radial direction of the rotary mass 24, and a disk-shaped bottom wall 10b provided integrally at the end of the peripheral wall 10a opposite to the rotary mass 24. A housing hole 10c is defined by the peripheral wall 10a and the bottom wall 10b. A compression coil spring 11 is provided in the accommodation hole 10c, and one end portion of the compression coil spring 11 is attached to the bottom wall 10b. The other end portion of the compression coil spring 11 has a ring-shaped washer with a hook. 11a is attached.

  The pencil 5 includes a cylindrical shaft portion 5a made of wood and a core 5b made of a pigment such as graphite and integrally provided in the shaft portion 5a. One end portions of the shaft portion 5a and the core 5b are cut into a conical shape, and the conical core 5b protrudes from the shaft portion 5a. The pencil 5 extends in the radial direction of the rotary mass 24, and most of the pencil 5 is accommodated in the accommodation hole 10c except for one end thereof. The core 5b protruding from the shaft portion 5a is in contact with the recording sheet 1, and the other end portion of the shaft portion 5a is in contact with the washer 11a. Further, the compression coil spring 11 is compressed with the pencil 5, and the pencil 5 is biased toward the recording sheet 1 by the compression coil spring 11, and the core 5 b is pressed against the recording sheet 1. When the rotary inertia mass damper 21 is not expanded and contracted and the screw shaft 23a is positioned at a predetermined neutral position with respect to the inner cylinder 22 and the nut 23c, the pencil 5 is in the width direction of the recording sheet 1 (the rotary mass 24). (In the axial direction).

  As described above, according to the first embodiment, for example, the relative displacement between the upper and lower beams BU and BD due to the vibration of the building B is transmitted to the rotary inertia mass damper 21, as shown in FIG. When the shaft 23a moves in the axial direction with respect to the inner cylinder 22 and the rotary mass 24, and the rotary mass 24 is rotated accordingly (see the thick arrow in the figure), the pencil 5 of the drawing mechanism 2 is free of the rotary mass 24. With respect to one point, it moves in the axial direction integrally with the screw shaft 23a and moves in the circumferential direction.

  As shown in FIG. 7, the locus of movement of the pencil 5 relative to the rotating mass 24 becomes a spiral with the same pitch and lead angle as the ball screw 23 when the restriction mechanism 25 is not in operation. Drawn and recorded. Such a locus of movement of the pencil 5 always occurs regardless of the type of vibration (harmonic vibration or irregular seismic vibration) input to the rotary inertia mass damper 21. Since the locus of movement of the pencil 5 drawn on the recording sheet 1 appropriately represents the movement state of the screw shaft 23a and the rotation state of the rotary mass 24 in association with each other, this is used to move and rotate the screw shaft 23a. It becomes possible to appropriately monitor the operation state of the rotary inertia mass damper 21 including the rotation state of the mass 24.

  For example, when an abnormality such as foreign matter entering between the screw shaft 23a and the nut 23c occurs in the rotary inertia mass damper 21, and the screw shaft 23a becomes difficult to move relative to the nut 23c, In comparison, the amount of movement of the pencil 5 in the axial direction with respect to the rotating mass 24 becomes smaller, and the rotating mass 24 also becomes difficult to rotate, so the amount of movement of the pencil 5 in the circumferential direction with respect to the rotating mass 24 also becomes smaller. Further, for example, when the rotation amount of the rotary mass 24 with respect to the axial movement of the screw shaft 23a becomes small due to an abnormality in the ball screw 23 or the limiting mechanism 25, the pencil 5 with respect to the rotary mass 24 is compared with a normal case. The amount of movement in the circumferential direction becomes smaller.

  The recording sheet 1 is removed from the rotating mass 24 after the vibration of the building B is stopped, and when the operating state of the rotating inertia mass damper 21 is monitored again, a new blank recording sheet 1 is rotated. It is attached to the mass 24 as described above. Alternatively, the recording sheet 1 is attached in a state of being wound around the rotating mass 24, and after the vibration of the building B is stopped, one rotation of the rotating mass 24 in the wound recording sheet 1 is set as the rotating mass. The operating state of the rotary inertia mass damper 21 may be monitored by removing it from 24.

  Further, according to the first embodiment, the universal joint UJ is provided at the end of the screw shaft 23a opposite to the rotary mass 24, and the base 3 of the drawing mechanism 2 is a screw provided with the universal joint UJ. The shaft 23a is integrally connected to a portion closer to the rotary mass 24 than the end of the shaft 23a. Even when the universal joint UJ rotates with respect to the screw shaft 23a and the rotating mass 24 as described above in accordance with the vibration of the building B, this configuration records the locus of movement of the pencil 5 with respect to the rotating mass 24. It is possible to appropriately draw on the sheet 1, and by extension, it is possible to appropriately monitor the operation state of the rotary inertia mass damper 21 using the above-described effect, that is, the movement trajectory of the pencil 5 drawn on the recording sheet 1. The effect of becoming can be obtained effectively.

  Furthermore, since the recording sheet 1 and the drawing mechanism 2 are configured using the sheet material including the paper material and the pencil 5, the monitoring device can be manufactured at a relatively low cost. Further, the pencil 5 is biased toward the recording sheet 1 by the compression coil spring 11, whereby the core 5 b of the pencil 5 is pressed against the recording sheet 1. For this reason, even when the screw shaft 23a of the rotary inertia mass damper 21 vibrates as it moves with respect to the rotary mass 24 by an external force, the lead 5b of the pencil 5 is prevented from separating from the recording sheet 1. The locus of the movement of the pencil 5 with respect to the rotating mass 24 can be drawn with the core 5b in proper contact with the recording sheet 1.

  Further, a grid-like ruled line is drawn on the recording sheet 1, which is composed of a plurality of ruled lines extending in parallel with each other in the circumferential direction of the rotary mass 24 and a plurality of ruled lines extending in parallel with each other in the axial direction of the rotary mass 24. For this reason, when the operation state of the rotary inertia mass damper 21 is monitored using the movement trajectory of the pencil 5 drawn on the recording sheet 1 as described above, the grid-like ruled line is used as a scale to measure the screw shaft 23a. The moving state and the rotating state of the rotating mass 24 can be monitored easily and more appropriately.

  Further, when the limiting mechanism 25 is provided in the rotary inertia mass damper 21 and the limiting mechanism 25 is activated when the axial load of the rotary inertia mass damper 21 reaches a predetermined limit load, the rotary mass 24 and the nut 23c are provided. Transmission of torque between the two is limited. For this reason, when the limiting mechanism 25 is activated, the amount of rotation of the rotary mass 24 relative to the amount of movement of the screw shaft 23a due to external force in the axial direction becomes larger or smaller than when the limiting mechanism 25 is not activated. Or

  As a result, the locus TL of the movement of the pencil 5 with respect to the rotating mass 24 when the restriction mechanism 25 is activated draws a spiral locus as in the case where the restriction mechanism 25 is not activated, but as shown in FIG. In addition, the trajectory TN of the movement of the pencil 5 with respect to the rotating mass 24 when the limiting mechanism 25 is not operating is shifted with a slight angle, and a checkered trajectory appears by both TL and TN. When the operated limiting mechanism 25 stops operating, the trajectory of the movement of the pencil 5 with respect to the rotating mass 24 returns to the original state, so that the above-mentioned point-like trajectory appears every time the inactive state limiting mechanism 25 operates. .

  Therefore, it is possible to appropriately monitor the presence or absence of the operation of the restriction mechanism 25 using the movement trajectory of the pencil 5 drawn on the recording sheet 1. The number of actuations can be grasped, and the timing at which the limiting mechanism 25 is actuated can be grasped in association with the stroke of the screw shaft 23 a based on the position of the checkered locus on the recording sheet 1. In FIG. 8, for easy understanding, a locus TL of movement of the pencil 5 with respect to the rotating mass 24 when the restriction mechanism 25 is activated is indicated by a one-dot chain line.

  Further, for example, when the monitoring device is applied to the rotary inertia mass damper 21 provided in the building B as shown in FIG. 1, it is drawn on the recording sheet 1 when the rotary inertia mass damper 21 is normal. The maximum value of the relative displacement input to the rotary inertia mass damper 21 from the upper and lower beams BU, BD can be easily grasped using the movement locus of the pencil 5.

  Specifically, as shown in FIG. 9, the portion SP of the recording sheet 1 that the core 5 b is in contact with before the vibration of the building B and the pencil 5 drawn on the recording sheet 1 during the vibration of the building B are shown. The linear distance in the width direction of the recording sheet 1 (the axial direction of the rotary mass 24) to one end (end on the screw shaft 23a side) EP1 of the movement trajectory is input in the direction in which the rotary inertia mass damper 21 extends. This corresponds to the maximum relative displacement value δMAX1. Further, the portion SP of the recording sheet 1 that was in contact with the core 5b before the vibration of the building B and the other end (inner cylinder) of the locus of movement of the pencil 5 drawn on the recording sheet 1 during the vibration of the building B The linear distance in the width direction of the recording sheet 1 with respect to EP2 end) EP2 corresponds to the maximum value δMAX2 of the relative displacement input in the direction in which the rotary inertia mass damper 21 contracts. In FIG. 9, for convenience, the grid-like ruled lines of the recording sheet 1 are omitted, and SP, EP1, and EP2 are indicated by black circles.

  Next, a monitoring device according to a second embodiment of the present invention will be described with reference to FIG. This monitoring device is applied to the viscous damper 41 instead of the rotary inertia mass damper 21 as compared with the first embodiment. In FIG. 10, the same components as those in the first embodiment are denoted by the same reference numerals. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The viscous damper 41 is of a general cylinder type, and includes a cylindrical cylinder 42, a piston that is provided in the cylinder 42 so as to be movable in the axial direction, and divides the inside of the cylinder 42 into two fluid chambers. A viscous body (both not shown) filled in the fluid chamber and a piston rod 43 integral with the piston. The piston is provided with an orifice and a relief valve for communicating the two fluid chambers. The shape of the cylinder 42 is not limited to a cylindrical shape, and may be another appropriate shape, for example, a rectangular tube shape.

  In addition, a clevis joint CJ is integrally provided at each of one end of the cylinder 42 (end opposite to the piston rod 43) and one end of the piston rod 43 (end opposite to the cylinder 42). Yes. The cylinder 42 and the piston rod 43 are connected to the lower beam BD and the upper beam BU of the building B through the clevis joint CJ, for example, similarly to the rotary inertia mass damper 21 of the first embodiment (for the sake of convenience, the cylinder 42 and the piston rod 43 are illustrated. (Refer to Fig. 1).

  In the viscous damper 41, the relative displacement between the upper and lower beams BU and BD accompanying the vibration of the building B is transmitted, and when the piston rod 43 moves in the axial direction with respect to the cylinder 42 together with the piston (viscous damper). Accordingly, a damping force corresponding to the pressure difference of the viscous body between the two fluid chambers is generated, thereby suppressing the relative displacement between the upper and lower beams BU and BD. The vibration of the object B is suppressed. The clevis joint CJ is provided in the cylinder 42 and the piston rod 43 for the same reason as the universal joint UJ of the first embodiment.

  In the monitoring device according to the second embodiment, the width of the recording sheet 1 is set to a predetermined value that is larger than the movable range of the piston rod 43 relative to the cylinder 42 and smaller than the length of the cylinder 42 in the axial direction. . In addition, the recording sheet 1 is attached to the outer peripheral surface of the cylinder 42 using a double-sided tape or the like in a wound state, and is disposed at a portion of the cylinder 42 on the piston rod 43 side. The cylinder 42 does not rotate with respect to the piston rod 43, unlike the rotating mass 24. For this reason, the recording sheet 1 is not wound around the entire circumferential direction of the cylinder 42 but is partially wound. Further, on the recording sheet 1, a grid-like ruled line is drawn which includes a plurality of ruled lines extending in parallel with each other in the circumferential direction of the cylinder 42 and a plurality of ruled lines extending in parallel with each other in the axial direction of the cylinder 42.

  One end portion of the base 3 of the drawing mechanism 2 is integrally connected to the piston rod 43 via a pair of connecting fittings 6 and 6 (only one is shown) as in the case of the first embodiment. , 6 are provided in a portion of the piston rod 43 closer to the cylinder 42 than one end of the piston rod 43 provided with the clevis joint CJ. The base portion 3 extends outward in the radial direction from the piston rod 43, and the support portion 4 of the drawing mechanism 2 extends from the other end portion of the base portion 3 in the axial direction of the viscous damper 41 along the cylinder 42. It extends.

  Furthermore, the holder 10 integrally provided at one end of the support portion 4 and the pencil 5 accommodated in the holder 10 extend in the radial direction of the cylinder 42. Similarly to the first embodiment, the pencil 5 is urged toward the recording sheet 1 by the compression coil spring 11 (see FIG. 5), and the core 5 b is pressed against the recording sheet 1. When the viscous damper 41 is not expanded and contracted and the piston rod 43 and the piston are positioned at a predetermined neutral position with respect to the cylinder 42, the pencil 5 is in the width direction of the recording sheet 1 (the axial direction of the cylinder 42). Located in the center.

  As described above, according to the second embodiment, for example, the relative displacement between the upper and lower beams BU and BD due to the vibration of the building B is transmitted to the viscous damper 41, so that the piston rod 43 is axial with respect to the cylinder 42. When moved in the direction, the pencil 5 of the drawing mechanism 2 moves in the axial direction integrally with the piston rod 43 with respect to the cylinder 42. The locus of the movement of the pencil 5 with respect to the cylinder 42 is linear and is drawn and recorded on the recording sheet 1. Since the locus of movement of the pencil 5 relative to the cylinder 42 appropriately represents the movement state of the piston rod 43 relative to the cylinder 42, the movement state of the viscous damper 41 including the movement state of the piston rod 43 is appropriately monitored using this. It becomes possible.

  For example, when an abnormality such as foreign matter entering the orifice of the piston occurs in the viscous damper 41, which makes it difficult for the piston rod 43 to move relative to the cylinder 42, compared to a normal case, The amount of movement of the pencil 5 is also reduced. When the recording sheet 1 is removed from the cylinder 42 after the vibration of the building B is stopped and the viscous damper 41 is monitored again, a new blank recording sheet 1 is placed in the cylinder 42 as described above. Attached.

  According to the second embodiment, the clevis joint CJ is provided at the end of the piston rod 43 opposite to the cylinder 42, and the base 3 of the drawing mechanism 2 is a piston rod provided with the clevis joint CJ. It is integrally connected to a portion closer to the cylinder 42 than the end of 43. Even when the clevis joint CJ rotates with respect to the piston rod 43 and the cylinder 42 in the same manner as the universal joint UJ due to the vibration of the building B, this configuration records the locus of movement of the pencil 5 with respect to the cylinder 42. It is possible to appropriately draw on the sheet 1, and as a result, it is possible to appropriately monitor the operation state of the viscous damper 41 by using the above-described effect, that is, the movement locus of the pencil 5 drawn on the recording sheet 1. The effect can be obtained effectively.

  Furthermore, since the recording sheet 1 and the drawing mechanism 2 are configured using the sheet material including the paper material and the pencil 5 as in the case of the first embodiment, the monitoring device can be manufactured at a relatively low cost. Further, the pencil 5 is biased toward the recording sheet 1 by the compression coil spring 11, so that the core 5 b of the pencil 5 is pressed against the recording sheet 1. For this reason, even when the piston rod 43 of the viscous damper 41 vibrates as it moves relative to the cylinder 42 due to an external force, the lead 5b of the pencil 5 is prevented from moving away from the recording sheet 1, and the cylinder 42 is prevented. The locus of the movement of the pencil 5 with respect to the recording sheet 1 can be drawn on the recording sheet 1 in a state where the lead 5b is in proper contact.

  Further, a grid-like ruled line is drawn on the recording sheet 1, which is composed of a plurality of ruled lines extending in parallel with each other in the circumferential direction of the cylinder 42 and a plurality of ruled lines extending in parallel with each other in the axial direction of the cylinder 42. For this reason, when the operation state of the viscous damper 41 is monitored using the movement locus of the pencil 5 drawn on the recording sheet 1 as described above, the movement state of the piston rod 43 using the grid-like ruled lines as a scale. Can be monitored easily and more appropriately.

  For example, when the monitoring device is applied to the viscous damper 41 provided in the building B, when the viscous damper 41 is normal, it is drawn on the recording sheet 1 as described in the first embodiment. The maximum value of the relative displacement input to the viscous damper 41 from the upper and lower beams BU and BD can be easily grasped using the movement locus of the pencil 5.

  The present invention is not limited to the first and second embodiments described below (hereinafter collectively referred to as “embodiments”), and can be implemented in various modes. For example, in the embodiment, the base 3 is connected to the screw shaft 23a (piston rod 43) using the connecting metal fittings 6 and 6, but may be connected by other appropriate methods, for example, by welding. May be. Moreover, in embodiment, although the base 3 and the support part 4 are comprised integrally, you may comprise separately and may be connected integrally. Furthermore, in the embodiment, the pencil 5 is separate from the support unit 4, but may be integrated with the support unit 4. In the embodiment, a grid-like ruled line is drawn on the recording sheet 1, but it may not be drawn.

  Further, in the embodiment, the recording sheet 1 is made of a paper material, but other suitable sheet material to which the pigment of the core 5b of the pencil 5 can adhere, for example, a sheet material obtained by laminating a resin to a paper material. Or you may comprise with a cloth material, a wooden sheet material, etc. In the embodiment, the pencil 5 is used as the drawing unit in the present invention. However, another suitable drawing unit configured to draw the movement locus in contact with the recording unit, for example, an oil pen Or a water-based pen may be used. In that case, not only the recording sheet 1 and the sheet material as described above but also a metal sheet material, a resin sheet material, or a sheet obtained by laminating a resin to a paper material or a cloth material as a recording portion in the present invention A material or the like may be used.

  Further, as described above, when a resin or metal sheet material is used as the recording portion, a shaft member having a sharp protruding portion at the tip is used as the drawing portion, and the recording portion is scratched by the protruding portion. By attaching, the locus of movement of the shaft portion (screw shaft 23a, piston rod 43) relative to the cylinder portion (rotating mass 24, cylinder 42) may be drawn and recorded on the recording portion.

  Alternatively, a sheet material including pressure-sensitive paper is used as the recording unit, and a shaft member having a protrusion at the tip is used as the drawing unit. The trajectory may be drawn and recorded on the recording unit.

  Alternatively, a touch pen may be used as the drawing unit, and the recording unit may be configured using a touch panel that can display and record an image drawn with the touch pen. In this case, any touch panel such as a resistive film type, a capacitance type, or an electromagnetic induction type can be used, and a touch pen suitable for the touch panel is used. Further, in this case, the touch panel may be configured so that the drawn movement trajectory of the touch pen can be divided and displayed every predetermined time or every predetermined stroke of the shaft portion.

  Alternatively, the recording unit is configured by the touch panel or a touch panel (touch pad, pen tablet) that does not have an image display function, and is connected to an external computer or the like wirelessly or by wire, and the touch pen drawn on the recording unit The movement trajectory may be divided and displayed on a monitor as described above, or may be printed by a printer. As described above, when the recording unit is wirelessly connected to an external computer, it is possible to monitor the operation states of a plurality of dampers (the rotary inertia mass damper 21 and the viscous damper 41) collectively by the computer. In addition, when the drawing unit is configured using the shaft member or the touch pen as described above, it is needless to say that an urging unit that urges the drawing unit toward the recording unit may be provided.

  Alternatively, the drawing unit may be configured to draw by drawing ink like an ink-jet printer, or may be used to draw by drawing a laser like a laser marker. In the case of using the drawing unit configured as described above, it is preferable to configure the drawing unit so that the ink is ejected and the laser irradiation is performed only during the operation of the damper.

  Further, in the embodiment, the recording sheet 1 as the recording unit is directly attached to the rotating mass 24 (cylinder 42) as the cylindrical portion, but may be attached via an appropriate member. Further, in the embodiment, the compression coil spring 11 is used as the biasing means in the present invention, but other appropriate means capable of biasing the drawing unit, such as rubber, may be used. is there. Alternatively, the biasing means may be omitted.

  Furthermore, the rotary inertia mass damper 21 described in the first embodiment is merely an example, and a nut that constitutes a ball screw together with a screw shaft is connected coaxially to a cylindrical rotary mass, and the screw shaft is connected to the nut. The monitoring device according to the present invention may be applied to other suitable rotary inertia mass dampers configured such that the rotary mass rotates with respect to the screw shaft integrally with the nut as it moves in the axial direction. Of course.

  For example, the monitoring device according to the present invention may be applied to a rotary inertia mass damper that is not provided with the universal joint UJ, a rotary inertia mass damper that is not provided with the limiting mechanism 25, or the nut is disposed inside the rotary mass. It may be applied to a rotary inertia mass damper in which both are arranged side by side in the axial direction. Instead of the limiting mechanism 25, the monitoring device according to the present invention may be applied to a rotary inertia mass damper having a limiting mechanism disclosed in Japanese Patent Application Laid-Open No. 2015-124518 by the present applicant.

  Further, when the rotary inertia mass damper 21 (viscous damper 41) is connected to the test apparatus and an external force in the axial direction is input to the inner cylinder 22 and the screw shaft 23a (cylinder 42 and piston rod 43) by the actuator of the test apparatus. The universal joint UJ (clevis joint CJ) does not rotate with respect to the screw shaft 23a (piston rod 43). Therefore, for example, the drawing mechanism is connected to a universal joint UJ (clevis joint CJ) provided at the end of the screw shaft 23a (piston rod 43), and the screw shaft is connected via the universal joint UJ (clevis joint CJ). You may connect to 23a (piston rod 43) integrally. Alternatively, the drawing mechanism may be connected to an actuator and integrally connected to the screw shaft 23a (piston rod 43) via the actuator.

  The embodiment is an example in which the monitoring device according to the present invention is applied to the rotary inertia mass damper 21 and the viscous damper 41. However, the present invention is not limited to this, and other suitable dampers having a cylindrical portion and a shaft portion. For example, the present invention can be applied to a damper having a rotating mass housed in an outer cylinder and a ball screw connected to the rotating mass (see “attenuator with amplification mechanism” described on the applicant's homepage). In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

1 Recording sheet (recording part)
2 Drawing Mechanism 3 Base 4 Supporting Section 5 Pencil (Drawing Section)
5b core 11 compression coil spring (biasing means)
21 Rotating inertia mass damper (damper)
23 Ball screw 23a Screw shaft (shaft)
23c Nut 24 Rotating mass (cylinder part)
25 Limiting mechanism UJ Universal joint 41 Viscous damper (damper)
42 Cylinder (Cylinder part)
43 Piston rod (shaft)

Claims (8)

A damper monitoring device that has a cylindrical portion and a shaft portion that are movable relative to each other in the axial direction, and generates a reaction force as the shaft portion moves relative to the cylindrical portion by an external force,
A recording unit that is integrally provided on the outer peripheral surface of the cylindrical unit and in which a drawn image is recorded;
A drawing mechanism integrally connected to the shaft portion and having a drawing portion arranged along the cylinder portion, and for drawing a locus of movement of the drawing portion relative to the cylinder portion on the recording portion;
A damper monitoring device comprising: The drawing mechanism is
A base portion provided integrally with the shaft portion and extending in a direction intersecting the axial direction of the shaft portion from the shaft portion;
A support portion provided integrally with the base portion and extending from the base portion along the cylindrical portion;
2. The damper according to claim 1, wherein the drawing unit is provided on the support unit and configured to draw a locus of movement with respect to the cylinder unit in a state of being in contact with the recording unit. Monitoring device.   The damper monitoring apparatus according to claim 2, wherein the drawing mechanism further includes a biasing unit that biases the drawing unit toward the recording unit. The recording unit is composed of a sheet material including a paper material,
4. The damper monitoring device according to claim 2, wherein the drawing unit is made of a pencil, and a core of the drawing unit is in contact with the recording unit. 5.   In the damper, a nut constituting a ball screw together with a screw shaft as the shaft portion is coaxially connected to a cylindrical rotary mass as the tube portion, and the screw shaft moves in an axial direction with respect to the nut. 5. The rotary inertia mass damper configured to rotate with respect to the screw shaft integrally with the nut. 5. Damper monitoring device.   The recording unit is drawn with a grid-like ruled line including a plurality of ruled lines extending in parallel with each other in the circumferential direction of the rotating mass and a plurality of ruled lines extending in parallel with each other in the axial direction of the rotating mass. The damper monitoring device according to claim 5. A universal joint is provided at the end of the screw shaft opposite to the rotating mass,
7. The damper monitoring device according to claim 5, wherein the drawing unit is integrally connected to a portion closer to the rotary mass than an end of the screw shaft.   When the axial load acting in the axial direction reaches a predetermined limit load, the rotary inertia mass damper limits the transmission of torque between the rotary mass and the nut, thereby reducing the axial load. 8. The damper monitoring device according to claim 5, further comprising a limiting mechanism for limiting the load to a limit load or less.

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