A point abrasion measuring scale and method

Abstract

The application relates to a point rail abrasion measuring scale and a measuring method, and relates to the field of track measurement, which comprises a base, a measuring scale comprising a horizontal scale arranged along an X direction, a vertical scale arranged along a Y direction and a vertical scale arranged along a Z direction, the three being slidingly connected, and a measuring head arranged on the horizontal scale, the vertical scale or the vertical scale, the measuring head moving along the X direction, the Y direction or the Z direction through the horizontal scale, the vertical scale and the vertical scale. When measuring, only the base needs to be adsorbed near the measuring point, then the measuring scale is slid along the X direction, the Y direction or the Z direction, the measuring head can be quickly and accurately positioned at the measuring point, in the position with a sliding bed plate, the measurement can be completed by crossing the sliding bed plate, in the position with a switch machine connecting rod, the measurement task can be completed while avoiding the connecting rod, the measuring range is greatly increased, time and labor are saved.

Description

Technical Field

[0001] This invention relates to the field of track measurement, and in particular to a gauge and method for measuring point rail wear. Background Technology

[0002] Switch rails are subjected to impacts from train wheels during use, making them prone to wear. Excessive wear can affect normal train operation. Therefore, it is necessary to measure the wear degree of railway switch rails. A switch rail wear measuring gauge is a specialized device used to measure the lateral wear value, vertical wear value, and lowering value of the switch rail.

[0003] In related technologies, the switch rail wear measuring ruler is a fixed structure that cannot be moved. The measuring point can only be changed by moving the position of the base plate. In locations with a slide plate, the biaxial measuring structure cannot be moved. To measure different positions of the switch rail, the only way is to change the position of the base plate adsorbed on the bottom of the switch rail. However, since the slide plate is tightly attached to the bottom of the switch rail, the base plate cannot be adsorbed at this point, resulting in the inability to measure the portion of the switch rail above the slide plate. In locations with a switch machine connecting rod, the connecting rod may interfere with the handle or measuring ruler of the biaxial structure in space, causing the switch rail at the interference point to be unmeasurable. Even in locations without obstacles, accurately positioning the measuring ruler at the measuring point can only be achieved by adjusting the position of the base plate. However, the base plate has a strong embedded magnet, making adjustments very time-consuming and laborious. Summary of the Invention

[0004] This invention provides a gauge and method for measuring the wear of switch rails, to solve the problems in related technologies where switch rails at interference positions cannot be measured and adjusting the position of the base plate is time-consuming and laborious.

[0005] In a first aspect, a gauge for measuring the wear of a switch rail is provided, comprising: a base; a measuring gauge including a horizontal ruler arranged along the X direction, a vertical ruler arranged along the Y direction, and a vertical ruler arranged along the Z direction, the three being slidably connected; and a measuring head disposed on the horizontal ruler, the vertical ruler, or the vertical ruler, the measuring head being movable along the X, Y, or Z direction via the horizontal ruler, the vertical ruler, and the vertical ruler.

[0006] In some embodiments, a support rod is mounted on the base, the horizontal ruler is fixed to the support rod, the vertical ruler is slidably mounted on the horizontal ruler, the vertical ruler is slidably mounted on the vertical ruler, and the measuring head is disposed on the vertical ruler.

[0007] In some embodiments, a vertical ruler display device is mounted on the vertical ruler via a first slider, the first slider is provided with a first zeroing line, and the vertical ruler is provided with a vertical ruler zeroing line corresponding to the first zeroing line.

[0008] In some embodiments, a first set bolt is mounted on the ruler display device, the axis of which is perpendicular to the side of the ruler.

[0009] In some embodiments, a vertical ruler display device is mounted on the vertical ruler via a second slider, the second slider is provided with a second zeroing line, and the vertical ruler is provided with a vertical ruler zeroing line corresponding to the second zeroing line.

[0010] In some embodiments, a second set screw is mounted on the vertical ruler display device, the axis of which is perpendicular to the side of the vertical ruler.

[0011] In some embodiments, the base has a groove on the side near the measuring ruler, and a magnet is installed in the groove.

[0012] Secondly, a method for measuring switch rail wear with a measuring ruler is provided, which includes the following steps: attaching the base to the bottom of the switch rail; driving the measuring head to move along the X, Y or Z direction by using a horizontal ruler, a vertical ruler and a vertical ruler to measure the switch rail drop value and the switch rail side wear value.

[0013] In some embodiments, the measurement step of the switch rail deflection includes: pushing the vertical ruler to align the zero mark of the vertical ruler with the second zero mark, and zeroing the vertical ruler display device; pushing the vertical ruler to position the vertical ruler above the switch rail, and pushing the vertical ruler until the probe contacts the top surface of the switch rail, at which point the data of the vertical ruler display device is the switch rail deflection at that position.

[0014] In some embodiments, the measurement steps for the side wear value of the switch rail include: pushing the vertical ruler to align the zero mark of the vertical ruler with the second zero mark, and zeroing the vertical ruler display device; pushing the vertical ruler and observing the vertical ruler display device until the vertical ruler drops 16mm, and locking the vertical ruler with the second set bolt; pushing the longitudinal ruler to align the zero mark of the longitudinal ruler with the first zero mark, and zeroing the longitudinal ruler display device; moving the longitudinal ruler to the measurement point, pushing the longitudinal ruler until the probe contacts the switch rail, and recording the data A on the longitudinal ruler display device; measuring the data B at the same position of the new switch rail using the same method, and the side wear value of the switch rail at this position is AB.

[0015] The beneficial effects of the technical solution provided by this invention include:

[0016] This invention provides a gauge and method for measuring rail wear. During measurement, the base plate is simply attached to the vicinity of the measurement point, and the measuring gauge can be quickly and accurately positioned at the measurement point by sliding along the X, Y, or Z directions. In locations with a slide plate, the measurement can be completed by stepping over the slide plate. In locations with a switch machine connecting rod, the measurement task can be completed while avoiding the connecting rod, greatly increasing the measurement range and saving time and effort. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the switch rail wear measuring ruler provided in an embodiment of the present invention;

[0019] Figure 2 This is a structural schematic diagram of the zeroing process of the switch rail wear measuring ruler provided in an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the cross-sectional structure of a standard steel rail 17 provided in an embodiment of the present invention.

[0021] Numbering on the map:

[0022] 1. Base; 2. Horizontal ruler; 3. Vertical ruler; 4. Vertical ruler; 5. Probe; 6. Support rod; 7. First slider; 8. Vertical ruler display device; 9. First zeroing mark; 10. Vertical ruler zeroing mark; 11. Second slider; 12. Vertical ruler display device; 13. Second zeroing mark; 14. Vertical ruler zeroing mark; 15. First set bolt; 16. Second set bolt; 17. Standard rail; 18. Magnet. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] This invention provides a gauge and method for measuring the wear of switch rails, which can solve the problems in related technologies where switch rails at interference positions cannot be measured and adjusting the position of the base plate is time-consuming and laborious.

[0025] See Figure 1As shown, an embodiment of the present invention provides a switch rail wear measuring ruler, which may include: a base 1, which is flat and can be installed on the bottom of the switch rail for equipment positioning; a measuring ruler, which may include a horizontal ruler 2 arranged along the X direction, a vertical ruler 3 arranged along the Y direction, and a vertical ruler 4 arranged along the Z direction, the three being slidably connected and perpendicular to each other; and a measuring head 5, which is L-shaped and used to avoid the connecting rod screws of the switch machine for easy alignment of the measuring point. The measuring head 5 is disposed on the horizontal ruler 2, the vertical ruler 3, or the vertical ruler 4, and the measuring head 5 moves along the X, Y, or Z direction via the horizontal ruler 2, the vertical ruler 3, and the vertical ruler 4. In this design, the measuring ruler has been improved by replacing the original measuring ruler with a sliding structure, allowing it to slide back and forth along the direction of the switch rail. The sliding range is greater than 1 / 2 the width of the slide plate. During measurement, the base 1 is simply attached to the vicinity of the measuring point, and then the measuring ruler can be slid along the X, Y, or Z directions to quickly and accurately position the probe 5 at the measuring point. When attached to the left side of the slide plate, the data of the upper left switch rail can be measured, and when attached to the right side, the data of the other half can be measured. The connecting rod of the switch machine can also be effectively avoided. Therefore, the data of any position of the entire switch rail can be measured, greatly increasing the measurement range and saving time and effort.

[0026] In related technologies, the measuring ruler adopts a split structure, with cylindrical protrusions used for positioning at the connecting parts and tightened with a single hand-tightening screw. During each disassembly and assembly, the cylindrical protrusions experience slight wear. After a certain number of disassembly and assembly cycles, increased wear leads to loose assembly and ruler body wobbling, significantly affecting measurement data. In this embodiment, the measuring ruler adopts an integral structure, with all connections assembled using screws and cylindrical pins, making it very robust and durable. The sliding measuring ruler undergoes precision grinding during processing, ensuring that the flatness and perpendicularity of each surface are no greater than 0.01mm, and the surface roughness is no greater than 0.8μm. After assembly and debugging, the relative positions of all components are guaranteed to be no more than 0.02mm, and the final measurement error of the device is no more than 0.05mm.

[0027] See Figure 1 As shown, in some embodiments, a support rod 6 can be installed on the base 1, the horizontal ruler 2 can be fixed to the support rod 6, the vertical ruler 3 is slidably installed on the horizontal ruler 2, the vertical ruler 4 is slidably installed on the vertical ruler 3, and the measuring head 5 is disposed on the vertical ruler 4. In this embodiment, the support rod 6 extends in the vertical direction. The support rod 6 can be fixed to the base 1 or movably installed on the base 1. The support rod 6 is connected to the horizontal ruler 2 through a T-shaped connector. The vertical ruler 3 can slide along the horizontal ruler 2, that is, in the X direction. The vertical ruler 3 is installed on the first slider 7 and can slide in the Y direction. The vertical ruler 4 is installed on the second slider 11 and can slide in the Z direction. The measuring head 5 is disposed at the lower end of the vertical ruler 4. This arrangement allows for convenient movement of the measuring head 5 and avoids interference between the measuring ruler and the switch rail or the ground.

[0028] In another embodiment, the horizontal ruler 2, the vertical ruler 3, and the vertical ruler 4 can be installed in other orders, such as the horizontal ruler 2 being installed on the vertical ruler 3 and the vertical ruler 4 being installed on the horizontal ruler 2, or the vertical ruler 4 being installed on the horizontal ruler 2 and the vertical ruler 3 being installed on the vertical ruler 4, etc.

[0029] Because the measurement method for switch rail side grinding is relative, the result is obtained by comparing two sets of data. Before measurement, the measuring scale must be zeroed. Related technologies use gauge blocks for zeroing. If the zeroing button on the measuring device is accidentally pressed, the gauge block must be used again for zeroing, which is very inconvenient. Therefore, see... Figure 1 As shown, in some embodiments, a ruler display device 8 is mounted on the ruler 3 via a first slider 7. The first slider 7 has a first zeroing mark 9, and the ruler 3 has a ruler zeroing mark 10 corresponding to the first zeroing mark 9. In this embodiment, the ruler 3 can slide along the Y direction within the first slider 7. The ruler display device 8 can detect the distance the ruler 3 has moved and display the data. The first slider 7 has a vernier scale with the first zeroing mark 9, and the ruler 3 has a corresponding ruler zeroing mark 10. By finely adjusting the position of the scale, the consistency of data from the same measuring equipment can be ensured, making it easier to find zero before measurement and resulting in more accurate measurements.

[0030] For details, see Figure 2 and Figure 3 As shown, taking the profile of a 60kg steel rail as the standard, when the zeroing mark 10 on the vertical ruler 3 is aligned with the first zeroing mark 9, the distance from the left end face of the vertical ruler 3 to the vertical adsorption surface of the base 1 is the distance from 16mm below the top surface of the standard steel rail 17 to the bottom side of the rail (39.52mm), and the error of the mark position does not exceed 0.05mm.

[0031] See Figure 1 As shown, in some embodiments, a first set bolt 15 is installed on the vertical ruler display device 8. The axis of the first set bolt 15 is perpendicular to the side of the vertical ruler 3. In this embodiment, the first set bolt 15 is used to lock the vertical ruler 3 after it has moved into place, so as to prevent the vertical ruler 3 from moving further.

[0032] See Figure 1As shown, in some embodiments, a vertical ruler display device 12 is mounted on the vertical ruler 4 via a second slider 11. The second slider 11 is provided with a second zeroing mark 13, and the vertical ruler 4 is provided with a vertical ruler zeroing mark 14 corresponding to the second zeroing mark 13. In this embodiment, the vertical ruler 4 can slide along the Z direction within the second slider 11. The vertical ruler display device 12 can detect the distance the vertical ruler 4 has moved and display the data. The second slider 11 is provided with a vernier scale, and the vernier scale is provided with the second zeroing mark 13. The vertical ruler 4 is provided with a corresponding vertical ruler zeroing mark 14. By finely adjusting the position of the marks, the consistency of data from the same measuring equipment can be ensured, making it easier to find zero before measurement and resulting in more accurate measurement.

[0033] For details, see Figure 2 and Figure 3 As shown, taking the profile of a 60kg steel rail as the standard, when the markings on the vertical ruler 4 are aligned, the distance from the bottom measuring surface of the horizontal ruler 2 to the adsorption surface of the base 1 is the height of the standard steel rail 17 (176mm).

[0034] See Figure 1 As shown, in some embodiments, a second set screw 16 is installed on the vertical ruler display device 12. The axis of the second set screw 16 is perpendicular to the side of the vertical ruler 4. In this embodiment, the second set screw 16 is used to lock the vertical ruler 4 after it has moved into place, so as to prevent the vertical ruler 4 from moving further.

[0035] See Figure 1 As shown, in some embodiments, the base 1 has a groove on the side near the measuring ruler, and a magnet 18 is installed in the groove. In this embodiment, the base 1 is attached to the bottom of the switch rail by the magnet 18, which occupies little space, avoids interference with the switch rail or the ground, and facilitates disassembly and assembly.

[0036] See Figure 1 and Figure 2 As shown, this invention provides a method for measuring switch rail wear using a measuring ruler. The method includes the following steps: attaching the base 1 to the bottom of the switch rail; driving the probe 5 along the X, Y, or Z directions using a horizontal ruler 2, a vertical ruler 3, and a vertical ruler 4; measuring the switch rail drop and side wear value. During measurement, simply attaching the base 1 near the measurement point and then sliding the measuring ruler along the X, Y, or Z directions allows for quick and accurate positioning of the probe 5 at the measurement point. This method can measure data at any position along the entire switch rail, greatly increasing the measurement range and saving time and effort.

[0037] See Figure 1 and Figure 2As shown, in some embodiments, the measurement step of the switch rail deflection value may include: pushing the vertical ruler 4 to align the vertical ruler zeroing mark 14 with the second zeroing mark 13, and zeroing the vertical ruler display device 12; pushing the vertical ruler 3 to position the vertical ruler 4 above the switch rail, and pushing the vertical ruler 4 until the probe 5 contacts the top surface of the switch rail. At this time, the data of the vertical ruler display device 12 is the switch rail deflection value at that position. In this embodiment, by adding a zero mark with a line width of 0.15 to 0.2 mm, the mark position can be finely adjusted. When using it, align the mark on the vertical ruler 4 with the mark on the corresponding vernier scale, and press the ZREO button on the vertical ruler display device 12. This can ensure the consistency of data from the same measuring equipment and make the measurement more accurate. The ruler itself has a built-in zero mark that can be used to zero the data at any time, which effectively avoids the situation where the device cannot work due to accidental touch.

[0038] The switch rail drop value refers to the height difference between the top surface of the switch rail and the top surface of the adjacent base rail. During measurement, the base 1 is attached to the bottom of the switch rail. First, push the vertical ruler 3 forward so that the vertical ruler 4 is above the base rail. Then, push the vertical ruler 4 downward to contact the top surface of the base rail. Press the zeroing button on the vertical ruler display device 12. Next, push the vertical ruler 3 backward so that the vertical ruler 4 is above the switch rail. Then, push the vertical ruler 4 downward so that the measuring head 5 contacts the top surface of the switch rail. At this time, the data on the vertical ruler display device 12 is the switch rail drop value at that position.

[0039] See Figure 1 and Figure 2 As shown, in some embodiments, the measurement steps for the wear value of the switch rail side may include: pushing the vertical ruler 4 to align the zero mark 14 of the vertical ruler with the second zero mark 13, and zeroing the vertical ruler display device 12; pushing the vertical ruler 4 and observing the vertical ruler display device 12 until the vertical ruler 4 drops 16mm, and locking the vertical ruler 4 with the second set screw 16; pushing the longitudinal ruler 3 to align the zero mark 10 of the longitudinal ruler with the first zero mark 9, and zeroing the longitudinal ruler display device 8; moving the longitudinal ruler 3 to the measurement point, pushing the longitudinal ruler 3 until the probe 5 contacts the switch rail, and recording the data A of the longitudinal ruler display device 8; measuring the wear value using the same method. The data B at the same position of the new switch rail is the side wear value of the switch rail at that position, which is AB. In this embodiment, by adding a zero mark with a line width of 0.15 to 0.2 mm, the position of the mark can be finely adjusted. When using it, align the mark on the vertical ruler 4 with the mark on the corresponding vernier scale, press the ZREO button on the vertical ruler display device 12, align the mark on the vertical ruler 3 with the mark on the corresponding vernier scale, press the ZREO button on the vertical ruler display device 8, and then start the measurement. This can ensure the consistency of data from the same measuring equipment and make the measurement more accurate. The ruler body has a built-in zero mark that can clear the data at any time, which effectively avoids the situation of failure due to accidental touch.

[0040] The side wear value of the switch rail is a relative value. The measurement point is the side wear data of the switch rail 16mm below the base rail. It is the difference between the current data and the data at the time of manufacture. Therefore, two measurements are required, and then the difference is calculated. The two measurement positions must be the same.

[0041] During measurement, determine the measurement point. With the base 1 attached to the bottom of the switch rail, first push the longitudinal ruler 3 forward so that the vertical ruler 4 is above the base rail. Then push the vertical ruler 4 downward to contact the top surface of the base rail. Press the zeroing button on the vertical ruler display device 12. Then push the longitudinal ruler 3 backward so that the vertical ruler 4 is away from the base rail. At this point, the vertical ruler 4 can be pushed downward again. Observe the vertical ruler display device 12 to determine that it has dropped by 16mm. Then lock the ruler body with the locking screw. At this point, the measurement point is determined.

[0042] After determining the 16mm mark, use the positioning marks on the ruler to zero the data on the vertical ruler display device 8, and then begin measurement. Determine the measurement location, such as the side wear value at a 20mm width of the switch rail section. First, attach the base 1 to the bottom of the switch rail near the measurement point. By sliding the vertical ruler 3, move the vertical ruler 4 to the measurement point, push the vertical ruler 3 so that the tip of the probe 5 contacts the switch rail, and record the data A on the vertical ruler 3 display device. Measure the data B at the same location on the new switch rail using the same method. The side wear value at a 20mm width of the switch rail section is AB.

[0043] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0044] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A gauge for measuring the wear of a switch rail, characterized in that, It includes: Base (1); The measuring ruler includes a horizontal ruler (2) set along the X direction, a vertical ruler (3) set along the Y direction, and a vertical ruler (4) set along the Z direction, which are slidably connected; And the probe (5), which is L-shaped, is used to avoid the connecting rod screw of the switch machine. The probe (5) moves along the X, Y or Z direction through the horizontal ruler (2), the vertical ruler (3) and the vertical ruler (4), and can slide back and forth along the direction of the switch rail. The sliding range is greater than 1 / 2 the width of the slide plate. During measurement, the base (1) is attached to the vicinity of the measurement point. The measuring ruler is slid along the X, Y or Z direction to position the probe (5) at the measurement point. In the position where there is a slide plate, the probe is crossed over the slide plate to complete the measurement task. In the position where there is a switch machine connecting rod, the probe is avoided while completing the measurement task. A support rod (6) is installed on the base (1), the horizontal ruler (2) is fixed to the support rod (6), the vertical ruler (3) is slidably installed on the horizontal ruler (2), the vertical ruler (4) is slidably installed on the vertical ruler (3), and the measuring head (5) is set on the vertical ruler (4). A vertical ruler display device (8) is installed on the vertical ruler (3) via a first slider (7). A first zeroing mark (9) is provided on the first slider (7). A vertical ruler zeroing mark (10) corresponding to the first zeroing mark (9) is provided on the vertical ruler (3). A vertical ruler display device (12) is installed on the vertical ruler (4) via a second slider (11). A second zeroing mark (13) is provided on the second slider (11), and a vertical ruler zeroing mark (14) corresponding to the second zeroing mark (13) is provided on the vertical ruler (4). The longitudinal ruler display device (8) is equipped with a first set bolt (15), the axis of which is perpendicular to the side of the longitudinal ruler (3). A second set screw (16) is installed on the vertical ruler display device (12), and the axis of the second set screw (16) is perpendicular to the side of the vertical ruler (4); The base (1) has a groove on the side near the measuring ruler, and a magnet (18) is installed in the groove.

2. A method for measuring the wear of a switch rail as described in claim 1, characterized in that, It includes the following steps: Attach the base (1) to the bottom of the switch rail; The probe (5) is driven to move along the X, Y or Z direction by the horizontal ruler (2), vertical ruler (3) and vertical ruler (4) to measure the drop value of the switch rail and the wear value of the switch rail side.

3. The measurement method as described in claim 2, characterized in that, The measurement steps for the switch rail deflection include: Push the vertical ruler (4) to align the zeroing mark (14) with the second zeroing mark (13), and clear the vertical ruler display device (12); Push the vertical ruler (3) so that the vertical ruler (4) is above the switch rail. Push the vertical ruler (4) until the probe (5) contacts the top surface of the switch rail. At this time, the data of the vertical ruler display device (12) is the switch rail reduction value at this position.

4. The measurement method as described in claim 2, characterized in that, The steps for measuring the wear value of the switch rail side include: Push the vertical ruler (4) to align the zeroing mark (14) with the second zeroing mark (13), and clear the vertical ruler display device (12); Push the vertical ruler (4) and observe the vertical ruler display device (12) until the vertical ruler (4) drops 16mm. Then, use the second set screw (16) to lock the vertical ruler (4). Push the vertical ruler (3) to align the vertical ruler zeroing mark (10) with the first zeroing mark (9), and clear the vertical ruler display device (8); Move the vertical ruler (3) to the measuring point, push the vertical ruler (3) until the probe (5) contacts the tip rail, and record the data A of the vertical ruler display device (8); Using the same method, measure the data B at the same location on the new switch rail. The side wear value of the switch rail at that location is AB.

Images