KR20160143120A - Device for measuring a moment of inertia - Google Patents

Abstract

A device for measuring a moment of inertia comprises a support unit, a wire, a wire fixing unit, a measured object fixing unit, and a rotation inducing unit. The support unit has a support extending along a Z-axis. One end of the wire is fixated to an upper portion of the support unit to extend along a Z-axis. The wire fixing unit fixates one end of the wire, and adjusts a length of the wire. The measured object fixing unit is coupled to the other end of the wire, wherein a measured object is fixated to a lower end. In the rotation inducing unit, one end is fixated to a lower end of the support unit, and the other end is coupled to the measured object to induce reciprocating rotation of the measured object.

Description

TECHNICAL FIELD [0001] The present invention relates to a device for measuring moment of inertia (MOMENT OF INERTIA)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inertial moment measuring apparatus, and more particularly, to an inertial moment measuring apparatus for measuring an inertial moment of a measurement object using an optical sensor and a rotation induction unit.

In general, the moment of inertia is also referred to as the inertial efficiency, and refers to the amount of energy that a rotating measuring object is about to maintain at that time. The moment of inertia is determined by the mass distribution around the axis, and the larger the mass of the body is distributed away from the axis of rotation, the larger the moment. An example is the principle of generating the action of a flywheel by installing a wheel with a large moment of inertia on a rotating axle.

 A turbo charger driven by an exhaust gas for supercharging an engine is a combination of a turbine and a compressor for driving it. The exhaust energy discharged to the conventional atmosphere is changed by the rotational force of the rotor provided in the exhaust passage and recovered , The filling efficiency of the mixed gas is enhanced by the compressor provided in the suction machine of the compressor, and the output and the fuel consumption are improved. Therefore, in order to recover the exhaust energy as much as possible, the moment of inertia of the rotor must be small so that a rotational force is generated even with a small amount of exhaust energy.

There are various methods for measuring the moment of inertia of a workpiece including the turbocharger. However, there are various methods to adjust the length of the wire, which is a parameter necessary to derive the rotation period and the moment of inertia of the workpiece, a device for stably inducing the first reciprocating rotation, There is a need for improvements in techniques capable of measuring the rotation period of the rotor.

In this regard, Korean Patent Laid-Open Publication No. 2002-0057162 discloses an invention for measuring the moment of inertia caused by a tilt of a shaft, and Korean Patent Publication No. 2002-0063646 discloses a technique in which a measured object is twisted with respect to a specific rotation direction The inertial moment is measured by the pendulum motion with respect to the rotation direction, but the invention does not disclose an invention for measuring the moment of inertia of a measurement object rotating at a small angle.

Therefore, there is a growing need for a technique capable of measuring the moment of inertia of a workpiece rotated at a fine angle.

Accordingly, it is an object of the present invention to provide an inertial moment measuring apparatus for measuring an inertial moment of a measurement object rotated at a fine angle using an optical sensor, a light source control device, and a rotation induction unit will be.

According to an aspect of the present invention, the inertial moment measuring apparatus includes a support, a wire, a wire fixing unit, a measurement fixture, and a rotation guide. The support portion includes a support extending along the Z axis, the wire being fixed to the upper portion of the support portion and extending along the Z axis, the wire fixing portion fixing one end of the wire, adjusting the length of the wire , The measuring and fixing unit is coupled with the other end of the wire and the measured object is fixed to the lower end, one end of the rotation inducing unit is fixed to the lower end of the supporting unit, and the other end is engaged with the object to be measured, .

In one embodiment, the wire may be fixed on the measuring fixture such that the top surface of the measuring fixture remains parallel to the X-axis perpendicular to the Z-axis.

In one embodiment, the rotation inducing unit moves toward the measured object and is coupled to the measurement object fixture, rotated at a predetermined angle in the first or second direction, and then moved toward the support unit and separated.

In one embodiment, the apparatus may further include an optical sensor unit for measuring the rotation period of the reciprocating rotation of the measurement object by irradiating light to the upper end of the measurement object fixture.

In one embodiment, the photosensor section includes a photosensor and a position adjustment arm, the photosensor irradiates light toward the measurement fixture, the position adjustment arm adjusts the direction of the light irradiation, Can support.

In one embodiment, the optical sensor unit may further include a light source control unit for controlling the diameter and the size of light of the optical sensor.

In one embodiment, the light source control device comprises a lens, a control ring and a detachment portion, the lens being irradiated with the light, and the control ring having a diameter and a size And the detachable portion can be attached to or detached from the optical sensor.

In one embodiment, the measurement fixture includes a turn-disk, a center-weight, a connecting rod, and a first connector, the turn-disk having a circular disk shape and irradiating the light, Wherein the connection rod connects the turn disc and the center weight, the first connection point is fixed to a lower end of the center weight and can be protruded through the lower end of the measured object, The connection rods can be integrally formed by being coupled with each other.

In one embodiment, the rotation induction part includes a support device and a rotation induction device, one end of which is fixed to the lower end of the support part and a cylindrical space is formed inside the other end, And a part of the rotation induction device is inserted into the space to be able to rotate in the first direction or the second direction and to move along the Z axis, A leader line intersecting the line can be formed.

In one embodiment, the rotation guide portion may further include a second connection portion having one end coupled to the rotation induction device and the other end connected to the first connection portion so as to be detachable or attachable.

In one embodiment, the second connector may be rotated together with the first connector when the first connector rotates in the first direction or the second direction with the first connector inserted.

In one embodiment, the turn disc may include a reflective sticker formed from the center to the side of the surface to which the light is irradiated.

In one embodiment, the optical sensor unit may measure the rotation period of the measured object by measuring reflected light generated in the process of entering and exiting the reflective sticker in the area irradiated with light in the reciprocating rotation state.

In one embodiment, the support comprises a support plate, a support and a parallel plate, the support plate being formed at the lower end, the support being elongated along the Z-axis and one end being coupled to the support plate, May be formed at the other end of the support.

In one embodiment, the wire fixing portion includes a wire fixing portion and an adjusting dial, and the wire fixing portion is coupled to an upper portion of the parallel plate to support a weight to be weighted on the wire, and the adjusting dial pulls the wire It can be released.

The inertia moment measuring apparatus of the present invention can repeatedly control the rotation angle of the measuring object fixing unit for fixing the measurement object through the rotation inducing unit so that it is possible to measure a reliable rotation period and moment of inertia by a plurality of the same experiments .

In addition, it is possible to finely adjust the length of each of the wires through the wire fixing portion formed on the parallel plate, thereby variously adjusting the experimental environment for measuring the moment of inertia, facilitating adjustment of the position of the light irradiated on the turn disk, The length of the wires can be adjusted according to the volume and size of the object to be measured.

Further, the optical sensor unit can control the light of the optical sensor to be irradiated to a desired position regardless of the position of the measuring and fixing unit, and it is possible to adjust the diameter and size of the light by attaching the light source control unit, It is possible to detect the rotation period of the measurement object.

1 is a perspective view showing an inertial moment measuring apparatus according to an embodiment of the present invention.
FIGS. 2 and 3 are perspective views illustrating an operation of rotating the rotation inducing unit of FIG. 1 by a predetermined angle in the first direction.
4 is a perspective view showing a state in which the rotation inducing unit of FIG. 3 is separated from the measuring and fixing unit.
Fig. 5 is a perspective view showing an operation in which the measuring object of Fig. 4 is repeatedly rotated in the first or second direction. Fig.
FIG. 6 is a perspective view showing a state in which the turn disk of FIG. 1 is repeatedly rotated in a first or second direction at a fine angle; FIG.
7 is a perspective view showing an apparatus for measuring moment of inertia according to another embodiment of the present invention.
8 is a perspective view showing a state in which the turn disk of FIG. 7 is repeatedly rotated in the first or second direction.

Hereinafter, an inertial moment measuring apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term "comprises" or "comprising ", etc. is intended to specify that there is a stated feature, figure, step, operation, component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing an inertial moment measuring apparatus according to an embodiment of the present invention. FIGS. 2 and 3 are perspective views illustrating an operation of rotating the rotation inducing unit of FIG. 1 by a predetermined angle in the first direction.

1 to 3, the inertial moment measuring apparatus 100 according to the present embodiment includes a support unit 200, a rotation induction unit 300, a photosensor unit 400, a measurement and determination unit 500, 600 and a wire fixing portion 700.

The support unit 200 includes a support plate 210, a support 220 and a parallel plate 230. The rotation guide unit 300 includes a support unit 310, a rotation induction unit 320, The optical sensor unit 400 includes a position adjusting arm 410, an optical sensor 420 and a first light 430. The measuring and fixing unit 500 includes a turn disk 510, And a first connection 540. The wires 600 include a first wire 610, a second wire 620, and a third wire 630. The first wire 610, the second wire 620, The wire fixing portion 700 includes a first fixing portion 710, a second fixing portion 720, and a third fixing portion 730.

The supporting device 310 includes a scale line 311 and the rotation inducing device 320 includes a leader line 321. The first fixing part 710 includes a first wire fixing part 711, The second fixing part 720 includes a second wire fixing part 721 and a second adjusting dial 722 and the third fixing part 730 includes a first adjusting dial 712, A three-wire fixing portion 731 and a third adjusting dial 732.

The inertial moment measuring apparatus 100 according to the present embodiment can measure the moment of inertia of a rotor for improving the performance of, for example, a turbocharger.

That is, it is possible to detect whether the rotor is defective by measuring the moment of inertia of the rotor, and when a moment of inertia of the rotor is large, a force generated by a small amount of the exhaust energy can be changed to the maximum rotational force of the rotor It is important to measure the moment of inertia of the rotor to improve energy efficiency and performance of the turbocharger.

The supporting part 200 of FIG. 1 has a support plate 210 formed in a plate shape at the lower end on the Z axis to support the inertia moment measuring device 100 and is formed on the support plate 210 A support base 220 is formed. The parallel plate 230 is formed on the upper part of the support table 220 in the form of a plate formed in parallel with the X axis perpendicular to the Z axis or the Y axis perpendicular to the Z axis and the X axis do.

The wire fixing part 700 is formed on the upper part of the parallel plate 230 to fix one end of each of the wires 600 and adjust the length of the wires 600. The other end of each of the wires 600 fixed to the wire fixing part 700 is formed so as to pass through the holes formed in the parallel plate 230 and to be suspended parallel to the Z axis line toward the support plate 210.

The first fixing part 710, the second fixing part 720 and the third fixing part 730 are arranged in the form of a triangle parallel to the parallel plate 230, Lt; / RTI > Each of the first to third wires 610 and 620 630 is fixed to the first to third fixing parts 710, 720 and 730 and the first to third adjusting dials 712 and 722 732 may be adjusted to move or pull the first to third wires 610, 620 630 toward the support plate 210.

2, the rotation inducing unit 300 is formed in a cylindrical shape and has one end coupled to the support plate 210 and the other end directed toward the parallel plate 230 , And moves the part upward to connect to the measuring and fixing part 500 and rotates clockwise or counterclockwise with respect to the Z axis and moves the part to the lower part to be detached from the measuring and fixing part 500 At the same time, the twisting state of the wires 600 is restored, and the measuring and fixing unit 500 and the measurement object 800 are reciprocally rotated within a predetermined angle range with respect to the Z axis.

2 and 3 are formed in a cylindrical shape, one end thereof is fixed to the support plate 210, and the other end of the support device 310 is cylindrical and has a diameter slightly smaller than the support device 310, A plurality of graduation lines 311 are formed on the other end surface around the space into which the rotation inducing device 320 is inserted. The rotation inducing device 320 is slidable along the Z axis and can rotate clockwise or counterclockwise with respect to the Z axis. On the side surface, the leader line 321 is formed so as to be parallel to the Z axis and crosses the scale lines 311.

Therefore, when the rotation inducing device 320 is rotated about the Z axis, the leader line 321 rotates, and the angle at which the leader line 321 moves along the graduation line 311 is referred to as the graduation line 311 so that the user can rotate the rotation inducing device 320 by an angle desired by the user.

The second connector (330) is fixed to the upper end of the rotation inducing device (320), and is formed into a cylindrical shape. The upper portion is opened upward while a space having a certain side structure is formed therein, When the first connection port 540 is inserted into the second connection port 330, the rotation induction unit 300 can be rotated clockwise or counterclockwise about the Z axis, The first connector 540 also rotates in the same direction and the entire measuring and collecting part 500 rotates together.

The upper surface of the turntable 510 of the measuring and fixing unit 500 is engaged with each of the wires 600 and maintained in a state perpendicular to the Z axis. The reflective sticker 511 is formed on the turntable 510 and the turn disk 510 is irradiated with light from the optical sensor unit 400 on the turntable 510, When rotating, the reflective sticker 511 moves repeatedly together with the turn disk 510.

The connection rod 520 forms a cylindrical shape, one end is fixedly coupled to the lower surface of the turn disk 510, and the other end is coupled to the upper end of the center weight 530. The connection rod 520 and the center weight 530 are formed integrally with each other, The center weight 530 forms a circular plate shape and forms a constant weight to keep the wires 600 tight.

The measurement object 800 is formed between the center weight 530 and the first connection port 540 and is rotated simultaneously when the turn disk 510 reciprocates. Therefore, the first to third wires 610, 620 and 630 are also twisted by the rotation of the turn disk 510 together with the measured object 800 rotating at a predetermined angle by the rotation inducing unit 300 When the second connector 330 is detached from the first connector 540 and moves to the lower end on the Z axis, the first to third wires 610, 620, and 630 are released, The disk 510 starts reciprocating rotation.

When the turn disk 510 starts reciprocating rotation, the reflective sticker 511 repeatedly passes through the area irradiated with the first light 430 while being reciprocally rotated, and the optical sensor 420 passes the first light 430 The first light 430 periodically collects the first light 430 reflected through the reflective sticker 511 to measure the rotation period of the measurement object 800.

In order to measure the rotation period of the measurement object 800, it is necessary to rotate the measurement object fixation unit 500 at a predetermined angle about the Z-axis to drive for reciprocating rotation. In order to measure the reliable moment of inertia, it is necessary to obtain a repetitive rotation period. Therefore, it is important to rotate at a constant angle every time a plurality of experiments are performed.

Therefore, by rotating the rotation inducing device 320 and determining the angle at which the leader 321 moves along the scale line 311 and repeating the experiment, a reliable rotation period for the measurement object 800 can be obtained And the moment of inertia corresponding thereto can be measured.

When the second connection port 330 and the rotation induction device 320 are moved together along the Z axis toward the measuring and fixing unit 500, the first connection port 540 is connected to the inside of the second connection port 330 And when the rotation inducing device 320 rotates in the first direction, the measuring and collecting part 500 can also rotate in the first direction at the same angle.

At this time, the first to third wires 610, 620, and 630 of FIG. 1 may be twisted in a first direction in a state of being coupled to the turn disk 510, respectively. When the first to third wires 610, 620 and 630 are twisted, the measurement object 800 includes a force to move in the second direction to maintain the original state.

4 is a perspective view showing a state in which the rotation inducing unit of FIG. 3 is separated from the measuring and fixing unit. 5 is a perspective view showing an operation of repeatedly rotating the measurement object in the first or second direction.

3, the rotation inducing device 320 is moved downward along the Z axis in a state where the rotation inducing part 300 and the measuring and fixing part 500 are rotated at a certain angle in FIG. The rotary guide part 300 and the measuring and fixing part 500 are detached and the turn disk 510 is reciprocally rotated in the first direction or the second direction.

When the measurement object 800 is rotated at a predetermined angle and the rotation guide device 320 and the second connection port 330 are moved down and separated from the first connection port 540, And the measuring and fixing unit 600 rotate in the second direction while the twisted state of the wires 600 is released, and when the wire 600 reaches the critical point, the measuring and fixing unit 600 maintains the reciprocating rotation in the first direction.

5, the first light 430 is irradiated and fixed to a part of the turn-off disc 510, and the reflection sticker 511 is rotated by the reciprocating rotation of the turn- The reflective sticker 511 repeatedly enters and exits the region irradiated with the first light 430 in a fixed state.

5, the turn disk 510 is rotated at a predetermined angle in the second direction so that the reflective sticker 511 moves out of the first light 430 in the second direction, The reflective sticker 511 moves in the first direction and passes through the first light 430.

When the reflective sticker 511 enters the area irradiated with the first light 430, the first light 430 is reflected and the optical sensor 420 reflects the first light 430 reflected . On the other hand, when the reflective sticker 511 is out of the area irradiated with the first light 430, the optical sensor 420 can not collect the reflected first light 430, The rotation period of the measurement object 800 can be derived by measuring the period of collecting the measurement object 800. [

FIG. 6 is a perspective view showing a state in which the turntable is repeatedly rotated in a first or second direction at a fine angle in FIG. 1; FIG.

Referring to FIG. 6, the turn disc 510 further includes a second reflective sticker 512.

The second reflective sticker 512 of FIG. 6 is used when the reciprocating rotation of the turn disk 510 is performed within a very small angle range. At this time, since the width of the second reflective sticker 512 is small, it is possible to observe an operation of reciprocating the second reflective sticker 512 visually even in reciprocating rotation at a small angle.

When the second reflective sticker 512 makes a reciprocating rotation in the first direction when the turn disk 510 makes fine reciprocating rotation, the second reflective sticker 512 still receives the first light 430 The second reflective sticker 512 may be located inside the area irradiated with the first light 430 even if the second reflective sticker 512 rotates in the second direction have.

Therefore, when the diameter of the area irradiated with the first light 430 on the turn disk 510 is large and the range of the angle at which the turn disk 510 reciprocates is small, Since the first light 430 can be reciprocally rotated within the range of the region irradiated with the first light 430, the reflection of the first light 430 is continuously performed, so that the rotation period of the turn disk 510 can be detected none.

At this time, a device capable of adjusting the diameter and size of the area irradiated with the first light 430 is coupled to the front surface of the optical sensor 420, so that the second reflective sticker 512 finely reciprocates It is possible to deviate from the area of the light irradiated by the optical sensor 420.

7 is a perspective view showing an apparatus for measuring moment of inertia according to another embodiment of the present invention. 8 is a perspective view showing a state in which the turn disk of FIG. 7 is repeatedly rotated in the first or second direction.

The inertial moment measuring apparatus 150 according to the present embodiment is the same as the inertial moment measuring apparatus 100 described with reference to Fig. 1, except for the light source adjusting apparatus 440, and therefore the same reference numerals are used, Omit this.

Referring to FIGS. 7 and 8, the optical sensor unit 400 further includes a light source control unit 440.

The light source control device 440 includes a lens, an adjustment ring, and a detachable portion.

The light source control device 440 shown in FIGS. 7 and 8 is coupled to one end of the optical sensor 420 to measure the diameter and size of the light emitted from the optical sensor 420 Can be adjusted. When the diameter and size of the light are adjusted, the second reflective sticker 512 reciprocally rotates inside the area of the light irradiated to the turn disk 510 when the turn disk 510 makes fine reciprocating rotation .

The light source control device 440 may include a detachable part to detach or attach the light source control device 440. The control ring may be formed at the center of the light source control device 440, 420 and the diameter and size of the light Can be adjusted. The lens is formed at the other end of the light source control device 440 so that the light emitted from the optical sensor 420 is irradiated to the outside through the lens. The second light 450 passes through the light source control device 440 to indicate light in a reduced diameter state.

In contrast, when the angle of reciprocating rotation of the turn disk 510 is wide, the second reflective sticker 512 passes through the area irradiated with the second light 450 on the turn disk 510 Because the period is longer, the speed of the experiment may be slowed down.

At this time, by adjusting the adjustment ring to increase the diameter and size of the second light 450, the area of the second light 450 irradiated on the turn disk 510 is controlled within an error range, Environment can be created.

Meanwhile, the diameter and size of the second light 450 can be directly adjusted through the adjustment ring, and the lens arranged in the light source adjustment device 440 is moved by driving the adjustment ring, The diameter and size of the light 450 can be adjusted and the size of the light source can be adjusted while moving a lens disposed on the front surface of the optical sensor 420 instead of the light source control device 440.

8, the second light 450 is irradiated onto the turn disk 510 in a state where the diameter thereof is reduced through the adjustment ring, and the second reflective sticker 512 is rotated by the rotation guide device 320 The first connector 540 and the second connector 330 are separated from each other to move the turntable 510 in the first or second direction repeatedly, It can be confirmed that the second reflective sticker 512 deviates from the area to which the second light 450 is irradiated even though the second reflective sticker 512 has moved in the first direction at a small angle, It is possible to measure the rotation period of the wafer 800.

That is, since the area irradiated with the second light 450 on the turn disk 510 is small, the optical sensor 420 does not have the same problem as the example of FIG. 6 in measuring the rotation period .

According to the embodiments of the present invention as described above, the moment of inertia measurement apparatus 100 may repeat the rotation angle of the measuring and fixing unit 500 for fixing the measurement object 800 through the rotation induction unit 300 repeatedly It is possible to measure a reliable rotation period and moment of inertia by a plurality of the same experiments.

Further, it is possible to finely adjust the length of each of the wires 600 through the wire fixing part 700 formed on the parallel plate 230, thereby enabling various adjustments of the experimental environment for measuring the moment of inertia, It is easy to adjust the position of the light irradiated on the disk 510 and the length of the wires 600 can be adjusted according to the volume and size of the object 800 to be measured.

The optical sensor unit 400 can control the light of the optical sensor 420 to a desired position irrespective of the position of the measuring and fixing unit 500, It is possible to adjust the diameter and the size of the light so that the rotation period of the measurement object 800 can be detected.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims. It can be understood that it is possible.

The inertial moment measuring apparatus for grasping the minute rotation period through the optical sensor unit and the rotation induction unit according to the present invention has industrial applicability that can be used in schools and laboratories.

100, 150: Moment of inertia measurement device 200: Support
300: rotation induction unit 400: optical sensor unit
500: Measuring station 600: Wires
700: Wire fixing part 800: Measuring object

Claims (15)

A support including a support extending along the Z axis;
A wire having one end fixed to the upper portion of the support and extending along the Z axis;
A wire fixing part fixing one end of the wire and adjusting the length of the wire;
A measuring fixture coupled with the other end of the wire and fixing the measured object to the lower end; And
And a rotation induction unit, one end of which is fixed to the lower end of the support unit, and the other end of which is engaged with the measurement object to induce the reciprocating rotation of the measurement object. The wire of claim 1,
And the upper surface of the measurement fixture is fixed on the measurement fixture so that the upper surface of the fixture fixture is parallel to the X-axis perpendicular to the Z-axis. The apparatus according to claim 1,
Wherein the inertia moment measuring device is moved toward the measured object and is coupled to the measurement object holder, rotated at a predetermined angle in the first or second direction, and then moved toward the support portion to be separated. The method according to claim 1,
Further comprising an optical sensor unit for irradiating light to an upper end of the measuring and fixing unit to measure a rotation period of the reciprocating rotation of the measurement object. The optical sensor unit according to claim 4,
An optical sensor for irradiating light toward the measuring and fixing unit; And
And a position adjusting arm for adjusting the irradiation direction of the light and supporting the photosensor. The optical sensor unit according to claim 5,
Further comprising a light source control device for controlling a diameter and a size of light of the optical sensor. The light source control apparatus according to claim 6,
A lens to which the light is irradiated;
An adjustment ring for adjusting the diameter and size of the light; And
And an attaching / detaching unit for attaching / detaching the optical sensor to / from the optical sensor. 6. The apparatus according to claim 5,
A turn disc having a circular disc shape and irradiating the light;
A center weight formed by a predetermined weight and pulling the wire;
A connecting rod connecting the turn disc and the center weight; And
And a first connector fixed to a lower end of the center weight and projecting through a lower end of the object to be measured,
Wherein the center weight and the connecting rod are integrally formed by being coupled to each other. [10] The apparatus of claim 8,
A supporting unit having one end fixed to the lower end of the support unit and the other end formed with a cylindrical space, the space opened toward the measurement object, and the scale lines formed on the upper surface; And
And a rotation inducing device inserted in the space and being capable of rotating in the first direction or the second direction and moving along the Z axis and having a side surface formed with a leader line intersecting the graduation line along the Z axis, Inertia moment measuring device. [12] The apparatus of claim 9,
Further comprising a second connector coupled at one end to the rotation inducing device and at the other end to be detachable or attachable to the first connector. 10. The connector according to claim 9,
Wherein when the first connector is inserted and rotated in a first direction or a second direction, the measuring and fixing unit rotates together. 9. The apparatus of claim 8,
And a reflective sticker formed from the center to the side of the surface to which the light is irradiated. The optical sensor unit according to claim 12,
Wherein the rotation period of the object to be measured is measured by measuring reflected light generated in the process of entering and exiting the reflective sticker in the region irradiated with the light in the reciprocating rotation state. The apparatus according to claim 1,
A support plate formed at the lower end;
A support which is elongated along the Z axis and has one end coupled to the support plate; And
And a parallel plate formed at the other end of the support plate in a plate shape. The wire fixing apparatus according to claim 14,
A wire fixing unit coupled to an upper portion of the parallel plate to support a weight to be weighted on the wire; And
And an adjusting dial for pulling or loosening the wire.

Images