KR102386593B1 - Rail apparatus and rail displacement measuring method - Google Patents

Abstract

The present invention relates to a rail part installed on a base frame extending along a path, a body part installed on the base frame to face the rail part in the extending direction of the path, and a body part mounted on the body part so as to be in contact with the end of the rail part. A rail device including a gauge portion and a scale portion formed on the outer surface of the gauge portion to measure the displacement of the rail portion in the extension direction, and a method for measuring the amount of rail deformation applied thereto, comprising: A method of measuring the amount of rail deformation is presented.

Description

RAIL APPARATUS AND RAIL DISPLACEMENT MEASURING METHOD

The present invention relates to a rail device and a method for measuring the amount of rail deformation, and more particularly, to a rail device and a method for measuring the amount of rail deformation capable of simply measuring the amount of rail deformation.

In the steelworks, various materials are loaded into converter facilities and continuous casting facilities using cranes. The crane is installed on rails. The rail distributes the crane's load and plays a role in stably driving the crane's wheel. Since these rails have the characteristic of repeating contraction and expansion in the longitudinal direction by heat, they are installed at a predetermined distance from each other in the longitudinal direction. If the rails contract excessively or expand excessively, the bolts fixing the rails may be loosened, a gap may be widened at the connection portion between the rails, and the connection portion between the rails may be bent. When the rail is damaged in this way, the wheel and the vehicle body of the crane may receive an impact while passing the damaged part of the rail.

In the prior art, an operator brought a measuring tool and moved to the rail, and then directly measured the distance between the connection parts between the rails. This conventional method has a problem in that there is a risk of collision between the crane and the operator, and the measurement result varies depending on the skill of the operator.

The technology underlying the present invention is disclosed in the following patent documents.

KR 10-2014-0121624 A KR 10-2019-0020476 A

The present invention provides a rail device capable of simply measuring the amount of rail deformation and a method for measuring the amount of rail deformation.

A rail device according to an embodiment of the present invention includes: a rail unit installed on a base frame extending along a path; a body part installed on the base frame so as to face the rail part in an extension direction of the path; a gauge part mounted on the body part so as to be in contact with the end of the rail part; and a scale part formed on the outer surface of the gauge part to measure the displacement of the rail part in the extension direction.

and an elastic part having one end connected to the gauge part so that the rail part and the gauge part are in close contact with each other.

The gauge part and the elastic part are arranged to be coaxial in the extending direction, the forward and backward directions of the gauge part are formed parallel to the extending direction, and the contact surface of the gauge part and the rail part is formed to intersect the extending direction. can be

and a stopper part mounted to the body so as to protrude toward the end of the rail part and spaced apart from the end of the rail part.

The body portion may include a cover spaced apart from an end of the rail portion; and a hollow housing mounted on the front surface of the cover facing the end of the rail part and having an inside open in the extension direction to support the forward and backward movement of the gauge part.

The gauge part may be disposed to penetrate the front surface of the housing, protrude from the housing, contact the rear surface of the rail part, and be elastically supported by the elastic part.

The elastic part may be mounted inside the housing to connect the cover and the gauge part.

The stopper part may be screwed to the body part so as to adjust the length of the protrusion from the body part by rotation.

The stopper part may be hollow so that the gauge part can be disposed therein, and a front end facing the end of the rail part may contact the outer surface of the gauge part.

An optical unit installed on the base frame to enlarge and display the scale unit; may further include.

The method for measuring the amount of rail deformation according to an embodiment of the present invention includes the steps of contacting a gauge portion with an end of a rail portion disposed along a route in an extension direction of the route; and confirming the displacement of the rail part in the extension direction by observing the scale part formed on the outer surface of the gauge part.

The process of contacting the gauge part may include a process of providing an elastic force to the gauge part so as to maintain contact with the end of the rail part by moving the gauge part forward and backward by the displacement in the extension direction.

The action of the elastic force, the forward/backward movement of the gauge part, and the displacement of the rail part may be performed on the same line.

The process of confirming the displacement may include a process of confirming the scale value of the scale part using a stopper part disposed to surround the outer surface of the gauge part.

The process of confirming the displacement may include a process of suppressing displacement of the rail part beyond the reference displacement in the extension direction by using the stopper part.

The process of suppressing the displacement of the rail part may include a process of supporting the end of the rail part in a direction opposite to a direction in which the rail part is displaced by using the stopper part.

The process of confirming the scale value of the scale part may include a process of enlarging and displaying the scale value of the scale part exposed to the outside of the stopper part.

According to the embodiment of the present invention, the gauge portion can be brought into contact with the end of the rail portion in the extending direction of the path, and the displacement of the rail portion can be confirmed by observing the scale formed on the gauge portion. From this, the operator can intuitively and quickly measure the amount of rail deformation by using the gauge part and the scale part.

And since the end of the rail and the gauge part face each other in the extending direction of the path and contact each other, the gauge part may vertically contact the rear surface of the end of the rail part. From this, the displacement of the rail portion in the extending direction of the path can be transmitted to the gauge portion without distortion, and the gauge portion can be effectively prevented from sliding or bending at the end of the rail portion.

1 is a schematic diagram of a rail device according to an embodiment of the present invention.
Figure 2 is an exploded and enlarged schematic view of a part of the rail device according to an embodiment of the present invention.
Figure 3 is a side cross-sectional view showing a part of the rail device according to an embodiment of the present invention cut.
4 and 5 are operational views of the rail device according to an embodiment of the present invention.
6 is an enlarged front view of a part of a rail device according to a modified example of an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, an embodiment of the present invention will be described in detail. However, the present invention is not limited to the embodiments disclosed below, and will be implemented in various different forms. Only the embodiments of the present invention are provided to complete the disclosure of the present invention, and to completely inform those of ordinary skill in the art the scope of the invention. The drawings may be exaggerated in order to explain the embodiment of the present invention, and like reference numerals in the drawings refer to the same elements.

The rail device and the method for measuring the amount of rail deformation according to an embodiment of the present invention may be applied to various driving equipment in various industrial fields. Hereinafter, an embodiment of the present invention will be described in detail with reference to a crane facility of a steel mill.

1 is a schematic diagram of a rail device according to an embodiment of the present invention.

1, the rail device according to an embodiment of the present invention, the rail unit 200 installed on the base frame 100 extending along the path, so as to face the rail unit 200 in the extending direction of the path The body part 300 installed on the base frame 100, the gauge part 400 mounted on the body part 300 so as to be in contact with the end 200a of the rail part, and the rail part in the extension direction of the path ( 200 , it includes a scale part 500 formed on the outer surface of the gauge part 400 to measure the displacement. The above-described displacement of the rail unit 200 may be referred to as a rail deformation amount.

And the rail device according to an embodiment of the present invention may include an elastic part 600 having one end connected to the gauge part 400 so that the rail part 200 and the gauge part 400 are in close contact with each other. By the elastic part 600 , the gauge part 400 may move forward and backward by the displacement of the rail part 200 .

The body part 300, the gauge part 400, the scale part 500, and the elastic part 600 mentioned above are referred to as a rail strain measuring device, and the rail device according to an embodiment of the present invention is a rail device having a rail strain measuring device. can be referred to as

In addition, the rail device according to an embodiment of the present invention is mounted on the body portion 300 so as to protrude toward the end 200a of the rail portion, and a stopper portion 700 that can be spaced apart from the end 200a of the rail portion. ) may be included.

Here, the stopper part 700 may be formed integrally with the rail deformation amount measuring device, and such a rail deformation amount measuring device may be referred to as a stopper-integrated rail deformation amount measuring device. The stopper-integrated rail strain measuring device can serve both as a stopper and as a rail strain measuring device. On the other hand, the rail device according to the embodiment of the present invention may be referred to as a rail device having a stopper-integrated rail deformation amount measuring device.

A plurality of rail devices, for example, two, may be formed to form a pair. A traveling device (not shown), for example, a crane device, may be installed drivably on the pair of rail devices. The pair of rail devices may be spaced apart from each other in a direction crossing the extension direction of the path. A crane installation may be formed to include a pair of rail devices and crane devices.

The base frame 100 may have an upper surface of a predetermined area so that the rail unit 200 can be installed. The base frame 100 may extend along a path. A bumper 800 may be formed at one end of the base frame 100 at which the end 200a of the rail is positioned.

The bumper 800 may protrude to a predetermined height from the upper surface of the base frame 100 so as to be in contact with a stopper (not shown) of the crane device. The body part 300 may be installed between the bumper 800 and the end 200a of the rail part.

Figure 3 is a side cross-sectional view showing a part of the rail device according to the embodiment of the present invention cut.

1 and 3 , the rail unit 200 is installed on the upper surface of the base frame 100 and may extend in the extension direction of the path. One or more clamps 210 may be provided on a side surface of the rail unit 200 , and the clamps 210 may be fixed to the upper surface of the base frame 100 by a fixing bolt 220 .

Referring to FIG. 1 , the rail unit 200 may include one or more rails. Hereinafter, the embodiment will be described with reference to the rail unit 200 having a plurality of rails, but the embodiment of the present invention may also be applied to the rail unit 200 having a single rail.

The rail unit 200 may include a plurality of rails. The plurality of rails may be arranged in an extension direction of the path and form one rail unit 200 . The plurality of rails may be arranged at a predetermined distance from each other. The plurality of rails may repeat expansion due to heat and contraction due to cooling. Of course, the plurality of rails may repeatedly expand and contract for various reasons including changes in the speed and load of the traveling device.

Displacement may occur in the rail unit 200 due to expansion and contraction of the plurality of rails. In an embodiment of the present invention, the displacement of the rail unit 200 may be checked by measuring the displacement of the outermost rail among the plurality of rails. The displacement of the outermost rail may include at least one of a displacement that occurs when the outermost rail itself expands and contracts, and a displacement that occurs when the outermost rail is pushed out by the expansion of an adjacent rail. In the case of a structure in which a plurality of rails are fastened to each other by a connecting member (not shown), the displacement of the outermost rail may further include a displacement that occurs when the outermost rail is pulled by contraction of an adjacent rail. Here, the neighboring rail may refer to the remaining rails except for the outermost rail among the plurality of rails.

Meanwhile, the aforementioned displacement of the rail part 200 may be a displacement with respect to the reference length of the rail part 200 . The reference length of the rail part 200 may be the length of the rail part 200 when no load is applied to the rail part 200 except for its own weight under a reference temperature and a reference pressure, for example, at room temperature and atmospheric pressure. Of course, there may be various methods for determining the reference length.

When the rail part 200 is the reference length, the protrusion amount of the gauge part 400 in contact with the end 200a of the rail part is defined as the reference protrusion amount. Such a reference protrusion amount may be obtained by contacting the gauge portion 400 with the end 200a of the rail portion in a reference state, for example, a reference temperature and a reference pressure. The reference protrusion amount may be displayed as a reference scale (not shown) on the scale part 500 , or may be marked in various ways including numbers and letters at various positions such as the side of the body part 300 .

Figure 2 is an exploded and enlarged schematic view of a part of the rail device according to an embodiment of the present invention.

1 and 2 , the body part 300 may be installed on the upper surface of the base frame 100 . The body part 300 may be spaced apart from the end 200a of the rail part toward the bumper 800 . The body part 300 may face the end 200a of the rail part in the extension direction of the path. Here, the end 200a of the rail part may refer to the end of the outermost rail.

The body part 300 may include a hollow housing 310 and a cover 320 . The housing 310 may be spaced apart from the end 200a of the rail portion toward the bumper 800 . A direction from the end 200a of the rail portion toward the bumper 800 may be referred to as a rear, and the opposite direction may be referred to as a front. Referring to FIG. 3 , a direction toward the left of the drawing is referred to as rear, and a direction toward the right of the drawing is referred to as front.

The housing 310 may be mounted on the front surface of the cover 320 facing the end 200a of the rail unit. The inside of the housing 310 may be opened in the extending direction of the path to support the forward and backward movement of the gauge unit 400 in the extending direction of the path. To this end, a through hole may be formed to pass through the housing 310 in the extension direction of the path. In this case, the gauge part 400 may be disposed so as to penetrate the through hole in the extending direction of the path, so that the gauge part 400 may be supported by the housing 310 . The housing 310 may be, for example, in the shape of a rectangular barrel, and may be formed in various other shapes.

The through hole may include a first section 310a and a second section 310b except for the first section 310a. The first section 310a may be positioned relatively forward, and the second section 310b may be positioned relatively rearward. A screw thread may be formed on the inner circumferential surface of the first section 310a, and the stopper part 700 may be mounted to the screw thread. The second section 310b may have a larger inner diameter than the first section 310a. A step may be formed between the first section 310a and the second section 310b, and the rear projection 420, which will be described later, of the gauge part 400 by the step is prevented from being separated from the through hole forward. can Meanwhile, the length of the second section 310b in the extending direction of the path may be a predetermined length capable of sufficiently accommodating the forward/backward movement of the gauge unit 400 and the contraction and expansion of the elastic unit 600 . In addition, the through-hole may have a circular cross-sectional shape. Of course, the shape of the through hole may vary.

The cover 320 may be spaced apart from the end 200a of the rail portion toward the bumper 800 , may be mounted on the rear surface of the housing 310 , and may close the rear end of the through hole. The cover 320 may be detachably mounted to the housing 310 by a bolt 321 . The cover 320 may be, for example, in the shape of a square plate. Of course, the shape of the cover 320 may vary.

A part of the gauge part 400 may be disposed to pass through the front surface of the housing 300 , and the remaining part may protrude forward from the housing 300 . The gauge part 400 may be elastically supported by the elastic part 600 , and may always maintain contact with the end 200a of the rail part. Specifically, the gauge part 400 may vertically contact the rear surface of the end 200a of the rail part.

The gauge part 400 may be formed in a round bar shape, but may be formed in various shapes such as a bar shape and a plate shape in addition to that. The gauge part 400 may include a front rod 410 extending in an extension direction of the path and a rear protrusion 420 formed at a rear end of the front rod 410 .

Referring to FIG. 3 , the gauge part 400 may move forward and backward in the extending direction of the path along the through hole by the elastic force of the elastic part 600 . By observing the degree (d) that the gauge part 400 protrudes forward from the body part 300 or the degree that the gauge part 400 protrudes forward from the stopper part 700, The displacement (X) in the extension direction of the path can be confirmed.

When the rail part 200 expands and the end 200a approaches the body part 300, it is defined as an increase in displacement (X). When the rail part 200 contracts and the end 200a moves away from the body part 300, the displacement X is reduced. For example, when the rail part 200 expands, the rail deformation amount has a positive value, and when the rail part 200 contracts, the rail deformation amount has a negative value. Meanwhile, the displacement X and the protrusion amount d of the gauge part 400 may be inversely proportional to each other. As the displacement X increases, the protrusion amount d may decrease, and as the displacement X decreases, the protrusion amount d may increase.

In this case, the scale part 500 may be formed on the outer surface of the gauge part 400 so as to quantitatively check the above-described displacement (X). The scale unit 500 may be formed in various ways with a desired scale. At this time, the more densely the scale of the scale part 500 is determined, the more precisely the displacement X can be confirmed.

A method of forming the scale part 500 may be various. The scale part 500 may be formed on the outer peripheral surface of the front rod 410 of the gauge part 400 . Accordingly, the operator can quickly and intuitively measure the amount of rail deformation by observing the scale unit 500 .

The elastic part 600 may be disposed inside the through hole of the housing 310 , and in detail, may be disposed inside the second section 310b. The elastic part 600 may be, for example, an elastic spring. The elastic part 600 may be mounted inside the second section 310b to connect the cover 320 and the gauge part 400 .

The front end of the elastic part 600 may be connected to the rear protrusion 420 of the gauge part 400 , and the rear end of the elastic part 600 may be connected to the front surface of the cover 320 . The elastic part 600 may apply an elastic force to push the gauge part 400 forward. In addition, the elastic part 600 may stably guide the retraction of the gauge part 400 when the gauge part 400 moves backward by the expansion of the rail part 200 .

The gauge part 400 and the elastic part 600 may be disposed to be coaxial in the extending direction of the path, and the forward/backward direction of the gauge part 400 may be formed in parallel with the extending direction of the path. In addition, the contact surface of the gauge part 400 and the rail part 200 may be formed to cross the extension direction of the path, and the end 200a of the rail part and the gauge part 400 face each other in the extension direction of the path. can be contacted

From this, the forward/backward movement of the gauge part 400 and the displacement of the rail part 200 may be organically performed on the same predetermined line parallel to the extension direction of the path. For this reason, the displacement X1 can be accurately transmitted to the gauge part 400 while the rail part 200 repeats expansion and contraction, and the gauge part 400 slides or separates from the end 200a of the rail part. can be effectively prevented.

The stopper part 700 may be, for example, screw-coupled to the body part 300 to adjust the protrusion length from the body part 300 by rotation. The stopper part 700 may be formed in a hollow shape so that the gauge part 400 can be disposed therein. The stopper part 700 serves to prevent the rail part 200 from excessively expanding rearward.

The stopper part 700 protrudes forward from the first member 710 and the first member 710 having a screw thread formed on the outer circumferential surface, and the second member ( 720) may be included.

The first member 710 may be screw-coupled to the first section 310a of the through-hole, and the length of the stopper portion 700 protruding forward from the body portion 300 may be adjusted by adjusting the degree of screw coupling. . The stopper part 700 can be easily rotated by the shape of the outer circumferential surface of the second member 720 . The stopper part 700 may have a front end facing the end 200a of the rail part in contact with the outer surface of the gauge part 400 . Accordingly, visibility of the scale unit 500 may be increased. For example, the front end 721 of the stopper part 700 may serve as a pointer of the scale part 500 .

4 and 5 are operational views of a rail device according to an embodiment of the present invention.

Referring to FIG. 4 , when the rail unit 200 expands due to heat, the gauge unit 400 is pushed back, and the gap between the stopper unit 700 and the rail unit 200 is narrowed, and the gauge unit 400 . The protrusion amount d1 of d1 becomes small. At this time, the backward movement of the gauge part 400 is supported by the elastic part 600. Check the scale value of the scale part 500 in contact with the front end of the stopper part 700, and the displacement of the rail part 200 therefrom. (X1) can be measured.

Referring to FIG. 5 , when the rail part 200 is contracted by cooling, the gauge part 400 protrudes forward, the gap between the stopper part 700 and the rail part 200 is widened, and the gauge part 400 ) of the protrusion amount d2 increases. At this time, the advance of the gauge part 400 is supported by the elastic part 600. At this time, the changed value of the rail part 200 by checking the scale value of the scale part 500 in contact with the front end of the stopper part 700 Displacement (X2) can be measured.

6 is an enlarged front view of a part of a rail device according to a modified example of an embodiment of the present invention.

The rail device according to an embodiment of the present invention may further include an optical unit 900 installed on the base frame 100 to enlarge and display the scale unit 500 . Referring to FIG. 6 , the optical unit 900 includes a barrel 910 having one or more lens members disposed toward the outer surface of the gauge unit 400 therein, and a side cover covering one opening of the barrel 910 ( 920 ), the other cover 930 covering the other opening of the barrel 910 , and an operation switch 940 formed to open and close the one cover 920 and the other cover 930 . The barrel 910 may be supported by the base frame 100 or the body 300 by a support (not shown). The one side cover 920 and the other side cover 930 may be rotatably coupled to rotation shafts respectively provided on one side and the other side of the barrel 910 . Each rotation shaft may be driven by a motor (not shown). In addition, the driving of the motor may be controlled by the operation switch 940 .

When the operator presses the operation switch 940 using the upper or lower extremities to open each cover, the scale part 500 can be seen enlarged by the lens member provided inside the barrel 910 . Accordingly, the operator can easily check the scale part 500 in an upright posture without bending the upper body.

Hereinafter, a method for measuring the amount of rail deformation according to an embodiment of the present invention will be described in detail. In the method for measuring the amount of rail deformation according to an embodiment of the present invention, the process of contacting the gauge portion 400 in the extension direction of the route to the end 200a of the rail portion disposed along the route, formed on the outer surface of the gauge portion 400 It includes the process of observing the scale part 500 to check the displacement (X) of the rail part in the extension direction of the path.

1 to 3 , the gauge unit 400 is brought into contact with the end 200a of the rail extending along the path in the extending direction of the path. Here, by providing the elastic force of the elastic part 600 to the gauge part 400 to move the gauge part 400 forward and backward by the displacement (X) of the above-described end 200a in the extension direction of the path, the end 200a of the rail part ) and the gauge part 400 can always be maintained in contact.

At this time, the action of the elastic force, the forward/backward movement of the gauge part 400 and the displacement of the rail part 200 may be performed on the same line. From this, the gauge part 400 may move forward and backward as much as the length at which the rail part 200 is deformed. That is, when the rail unit 200 expands, the gauge unit 400 moves backward and maintains contact with the end 200a of the rail unit. When the rail unit 200 is contracted, the gauge unit 400 may advance forward and maintain contact with the end 200a of the rail unit.

Then, by observing the scale part 500 formed on the outer surface of the gauge part 400, the displacement of the above-described end 200a in the extension direction of the path is confirmed. At this time, the scale value of the scale part 500 is checked using the stopper part 700 arranged to surround the outer surface of the gauge part 400 .

That is, it is possible to check the scale value of the scale part 500 in contact with the front end of the stopper part 700 . In this case, the above-described scale value of the scale part 500 exposed to the outside of the stopper part 700 may be enlarged and displayed to the operator by using the optical part 900 .

Meanwhile, in the process of measuring the displacement X, it is possible to suppress the displacement of the rail part 200 beyond a predetermined reference displacement preset in the extension direction of the path by using the stopper part 700 . Specifically, in the direction opposite to the direction in which the rail part 200 is displaced when the rail part 200 is expanded, the end 200a of the rail part may be supported by the stopper part 700 . Accordingly, it is possible to prevent a displacement exceeding the reference displacement from occurring in the rail unit 200 .

The above embodiments of the present invention are intended to illustrate the present invention, not to limit the present invention. It should be noted that the configurations and methods disclosed in the above embodiments of the present invention may be combined and modified in various forms by combining or crossing each other, and modifications thereof may also be considered as the scope of the present invention. That is, the present invention will be embodied in various different forms within the scope of the claims and equivalent technical spirits, and those skilled in the art to which the present invention pertains can implement various embodiments within the scope of the technical spirit of the present invention. will be able to understand

100: base frame
200: rail
300: body
400: gauge part
500: scale
600: elastic part
700: stopper part
900: optical unit

Claims (17)

a rail unit installed on the base frame extending along the path;
a body part installed on the base frame so as to face the rail part in an extension direction of the path;
a gauge part mounted to the body part so as to be in contact with the end of the rail part;
and a scale part formed on the outer surface of the gauge part to measure the displacement of the rail part in the extension direction
The body part,
a cover spaced apart from the end of the rail part;
and a hollow housing mounted on the front surface of the cover facing the end of the rail part and having an interior open in the extension direction to support the forward and backward movement of the gauge part. The method according to claim 1,
and an elastic part having one end connected to the gauge part so that the rail part and the gauge part are in close contact with each other. 3. The method according to claim 2,
The gauge part and the elastic part are arranged to be coaxial in the extending direction,
The forward and backward direction of the gauge part is formed parallel to the extension direction,
A rail device in which a contact surface of the gauge part and the rail part crosses the extending direction. The method according to claim 1,
and a stopper part mounted on the body part so as to protrude toward the end of the rail part and spaced apart from the end of the rail part. delete 3. The method according to claim 2,
The gauge part is disposed to penetrate the front surface of the housing, protrudes from the housing, contacts the rear surface of the rail part, and is elastically supported by the elastic part. 7. The method of claim 6,
The elastic part is a rail device mounted inside the housing to connect the cover and the gauge part. 5. The method according to claim 4,
The stopper portion is a rail device screwed to the body portion so as to adjust the protrusion length from the body portion by rotation. 9. The method of claim 8,
The stopper part is formed in a hollow shape so that the gauge part can be disposed therein, and a front end facing the end of the rail part is in contact with an outer surface of the gauge part. The method according to claim 1,
The rail device further comprising a; an optical unit installed on the base frame so as to display the scale in an enlarged manner. contacting the gauge part with the end of the rail part disposed along the path in the extending direction of the path;
The process of confirming the displacement of the rail part in the extension direction by observing the scale part formed on the outer surface of the gauge part;
The process of confirming the displacement is,
The method of measuring the amount of rail deformation, including a step of checking the scale value of the scale part using a stopper part disposed to surround the outer surface of the gauge part. 12. The method of claim 11,
The process of contacting the gauge part,
and providing an elastic force to the gauge portion to maintain contact with the end of the rail portion by moving the gauge portion forward and backward by the displacement in the extension direction. 13. The method of claim 12,
A method of measuring the amount of rail deformation in which the action of the elastic force, the forward/backward movement of the gauge part, and the displacement of the rail part are performed on the same line. delete 13. The method of claim 12,
The process of confirming the displacement is,
and a step of suppressing displacement of the rail portion beyond the reference displacement in the extension direction by using the stopper portion. 16. The method of claim 15,
The process of suppressing the displacement of the rail part,
and supporting an end of the rail part in a direction opposite to a direction in which the rail part is displaced by using the stopper part. 13. The method of claim 12,
The process of checking the scale value of the scale part,
The method of measuring the amount of rail deformation comprising a; enlarging and displaying the scale value of the scale part exposed to the outside of the stopper part.

Images