Calibration ruler for calibrating track lining precision of tamping wagon
By designing a calibration ruler for calibrating the track alignment accuracy of tamping machines, the difficulty of relying on standard lines for traditional tamping machine calibration methods has been solved. This enables fast and accurate alignment accuracy calibration on any line, especially for the calibration of the front and rear follow-up sensors of turnout tamping machines, improving calibration efficiency and accuracy.
Patent Information
- Application Number
- CN202520095131.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-01-15
AI Technical Summary
Traditional tamping machine calibration methods require standard lines that are difficult to find, manual operation is time-consuming and labor-intensive, measurement accuracy is affected by wind, and turnout machines cannot be calibrated on-site, affecting track alignment accuracy.
Design a calibration ruler for calibrating the track alignment accuracy of tamping machines, including a ruler body, a positioning component, a steel string holder, and a locking component. It can be calibrated on any railway line. The positioning component abuts against the rail, and the steel string is fixed by the steel string holder and the locking component, so as to achieve fast and accurate track alignment accuracy calibration.
The calibration of tamping machines can be completed quickly without the need for standard lines, which is especially suitable for turnout tamping machines. It ensures the accurate calibration of the front and rear follow-up sensors, improving calibration efficiency and accuracy.
Smart Images
Figure CN223706146U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of special tools for railway maintenance machinery, especially to the calibration ruler for calibrating the way shifting precision of tamping car. BACKGROUND
[0002] Tamping car is a kind of large-scale maintenance machinery, mainly used for the maintenance and repair of railway lines. It can perform way shifting, ballast tamping and other operations on the track, improve the stability of the guide rail, eliminate the directional deviation of the track, and make the track line meet the design standards and requirements. The documents such as Jitie Gong
[2022] 192 and Gongshi Han
[2022] 86 require that when the single-car continuous operation of the tamping car reaches 30 days or the single-car cumulative operation mileage reaches 50 km, the first operation after the transfer should be calibrated in advance before high-speed operation. It is required to ensure that the actual value of mechanical measurement and the actual value of electrical display are consistent before the directional deviation detection of the tamping car, and when there is an error, the tamping car needs to be zero corrected, i.e. zero calibration. In order to ensure the consistency of zero error of the same group of cars, the same group needs to be calibrated at the same position.
[0003] The calibration method of the traditional tamping car mainly uses a special standard line (horizontal, direction, high and low are all zero), which is not available in the construction site. Or try to find a line with good direction, put the measuring trolley of the tamping car in place, and mark the rails directly below the left and right measuring trolleys. Move the tamping car and use manual string measurement to find the directional error of point C on the rail corresponding to the measuring trolley (point C here refers to the measuring position between the left and right detection positions). Then move the tamping car to the corresponding point on the line, and use a steel ruler and a protractor to measure the distance between the contact surface of the front tension trolley wheel flange on the inner side of the rail and the steel string, and the distance between the contact surface of the rear tension trolley wheel flange on the inner side of the rail and the steel string. Adjust the steel string or the gaskets at the installation shaft of the front detection trolley wheel and the rear detection trolley wheel to make the distance between the front detection trolley wheel flange and the rear detection trolley wheel flange and the steel string to the standard distance (usually 712.5 mm), ensure that the vertical distance between the steel string after tensioning and the steel rail after loading is consistent, and then correct the compensation amount through the measured C point error to make the electrical measurement display value and the actual value of the way shifting trolley consistent, and realize the directional calibration of the tamping car. This method requires a standard line, but it is not easy to find a standard line in the operation site. When there is no standard line, manual string measurement is needed, and the tamping car needs to be moved back and forth to confirm the actual error of the measurement point. It needs the cooperation of three people to complete, which is time-consuming and labor-intensive. At the same time, the string is easily blown by the wind, affecting the measurement accuracy. The tamping cars of different groups also need to be calibrated one by one at the same position, which delays the overall progress.
[0004] Due to the limitations of its operating principle, the turnout tamping machine's direction detection system incorporates front and rear follow-up sensors. During operation, both the measuring sensor and the track-setting sensor are constantly involved in the calculations. Theoretically, direction calibration is impossible without a standard line. Traditionally, calibration is performed on a standard line, or errors are offset by adding compensation values based on experience. Using two calibration rulers allows for convenient and quick calibration of the turnout machine's front and rear follow-up sensors and the track-setting zero point. Utility Model Content
[0005] Traditional tamping machine calibration requires a standard line, or the error value of the measurement point is found by manually pulling a string on the tamping machine to be calibrated (08, 09, tamping machine). Calibration is performed by moving the tamping machine back and forth on the line. However, standard lines are not easy to find, and manually pulling the string requires multiple people to measure, which is time-consuming and labor-intensive. At the same time, the string is easily affected by wind swaying, affecting the measurement accuracy and thus the calibration accuracy. Furthermore, due to the special measurement principle of turnout machines, there is no standard line for on-site calibration. This application is a calibration ruler for calibrating the track alignment accuracy of tamping machines, which can solve the above problems in at least one aspect or for one purpose. The technical solution adopted is as follows:
[0006] The calibration ruler used to calibrate the track alignment accuracy of the tamping machine includes:
[0007] The ruler body has a positioning element near one end. The positioning element abuts against the inner side of the rail during measurement. The ruler body has scale lines along its length, and the outer side of the positioning element is the zero point of the scale lines.
[0008] A steel wire holder is slidably mounted on the ruler body.
[0009] The locking element is located on the steel string holder and is used to fix the steel string holder.
[0010] Preferably, the steel wire holder includes:
[0011] The slide is slidably mounted on the ruler body;
[0012] The card plate is rotatably mounted on the slide. One end of the card plate has a card slot, which is set along the length of the card plate.
[0013] Preferably, the card plate is a rectangular plate with graduations along its length. A card slot is provided at one end along the length of the card plate. An adjustment hole is provided inside the card plate. A first threaded hole is provided on the slide. A bolt passes through the adjustment hole and is threadedly connected to the first threaded hole.
[0014] Preferably, the slide is a cuboid structure, and the card plate is rotatably mounted on the side of the slide. Two protrusions are provided at two opposite corners of the side of the slide, and the vertical and horizontal spacing between the two protrusions is equal to the width of the card plate.
[0015] Preferably, the upper surface of the sliding seat is provided with a mounting hole, and a magnifying lens is arranged in the mounting hole, and a mark line is arranged on the magnifying lens.
[0016] Preferably, the magnifying lens and the clamping plate are arranged staggeredly in a vertical plane.
[0017] Preferably, the sliding seat comprises an upper plate and a lower plate, and the upper plate and the lower plate are connected through screws.
[0018] Preferably, the locking member is a locking bolt, and the sliding seat is provided with a second threaded hole, and the locking bolt is threadedly connected to the second threaded hole.
[0019] Preferably, the outer side surface of the positioning member is an arc surface, the maximum position of the arc height of the arc surface is the zero position of the mark line, and the positioning member is arranged on the lower surface of the ruler body.
[0020] Preferably, the ruler body is provided with an insulating sleeve at both ends.
[0021] The above-mentioned calibration ruler can be used for calibration on any railway line without a standard line, and the calibration of the tamping vehicle can be realized quickly; especially for the turnout tamping vehicle, the calibration ruler can be used for conveniently calibrating the front and rear follow-up ratios, and the calibration is accurate; when the follow-up cylinders and sensors of the front and rear follow-up positions of the turnout tamping vehicle are faulty, the mechanical zero position of the front and rear follow-up positions can be quickly determined by using the calibration ruler, and the electrical zero position of the sensor can be determined when the follow-up sensor is replaced. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figures 1-2 is a perspective view of the utility model;
[0023] Figure 3 is a top view of the utility model;
[0024] Figure 4 is a state diagram of the clamping plate in a vertical state.
[0025] In the figure, 1 is a ruler body, 2 is a positioning member, 3 is a mark line, 4 is a steel string clamping seat, 401 is an upper plate, 401a is an inner plastic lining plate, 401b is an outer metal plate, 402 is a magnifying lens, 403 is a clamping plate, 404 is an adjusting hole, 405 is a bolt, 406 is a lower plate, 407 is a clamping groove, 408 is a mounting hole, 409 is a protruding block, 410 is a mark line, 5 is a locking bolt, and 6 is an insulating sleeve. DETAILED DESCRIPTION
[0026] In order to clearly illustrate the technical features of the scheme, the utility model is described in detail below through a specific implementation manner and in combination with the drawings.
[0027] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.
[0028] As shown in Figures 1-4 The calibration ruler for calibrating the tamping accuracy of the tamping car includes a ruler body 1, a positioning member 2, a steel string clamping seat 4 and a locking member. The ruler body 1 is in the shape of a rectangle and is in the shape of a long strip. The ruler body 1 is provided with a scale line 3 along the length direction thereof. The scale line 3 can be directly engraved on the ruler body 1 or directly embedded on the ruler body 1. The positioning member 2 is arranged at a position close to one end of the ruler body 1. The outer side surface of the positioning member 2 is the zero point position of the scale line 3. The scale gradually increases from this end to the other end. The other end of the ruler body 1 is close to the maximum scale position of the scale line 3. In this embodiment, the maximum scale of the scale line 3 of the ruler body 1 is 1450 mm. During measurement, the tamping car is loaded so that the wheel flange of the detection trolley is in abutment with the inner side surface of the rail. The outer side surface of the positioning member 2 is in abutment with the inner side surface of the rail. The steel string clamping seat 4 is movably arranged on the ruler body 1 and can move along the ruler body 1. The steel string clamping seat 4 on the ruler body 1 is moved so that the steel string of the tamping car is clamped in the steel string clamping seat 4. The distance from the detection trolley wheel to the steel string is read at this time. If the distance is inconsistent with the system display distance, the system value is calibrated. The fixing of the steel string clamping seat 4 on the ruler body 1 is realized by the locking member. The locking member can fix the steel string clamping seat 4 when the steel string clamping seat 4 does not move, so as to avoid the movement of the steel string clamping seat 4.
[0029] When the 08-32 type or 09-32 tamping car and the tamping tamping car are calibrated:
[0030] Firstly, D, C and B represent three detection positions of the tamping vehicle, the positions of D and B are detected first, and the position of C is detected last. The measuring trolley is loaded to the left, the steel string is tensioned, the positioning member 2 of the calibration ruler is first abutted against the inner side of the rail at the D point, the steel string is clamped into the steel string clamp 4 by moving the position of the steel string clamp 4 on the ruler body 1, the distance L1 between the steel string and the A point at this time is read; then the positioning member 2 of the calibration ruler is abutted against the inner side of the rail at the B point again, the steel string is clamped into the steel string clamp 4 by moving the position of the steel string clamp 4 on the ruler body 1, the distance L2 between the steel string and the C point at this time is read, if L2≠L1, the position of the steel string G fixing seat is fine-tuned so that L2=L1. Then the positioning member 2 of the calibration ruler is abutted against the inner side of the rail at the C point again, the steel string is clamped into the steel string clamp 4 by moving the position of the steel string clamp 4 on the ruler body 1, the distance L3 between the steel string and the B point at this time is read, and the position of the turnout sensor is directly adjusted according to L3 or the error between the real value and the measured value of the measurement system is corrected so that the system value is consistent with the real value.
[0031] Then the measuring trolley is loaded to the right in the same way as above, the positioning member 2 of the calibration ruler is abutted against the inner side of the rail at the D point and the B point in turn, the steel string is clamped into the steel string clamp 4 by sliding the steel string clamp 4, the distance L4 between the steel string and the D point of the tamping vehicle and the distance L5 between the steel string and the B point of the tamping vehicle are read, if L4≠L5, the positions of the trolley wheels at the D point and the B point are adjusted by adding or subtracting shims at this time, finally L4=L5 is obtained, then the positioning member 2 of the calibration ruler is abutted against the inner side of the rail at the C point, the steel string is clamped into the steel string clamp 4 by sliding the steel string clamp 4, the distance L6 between the steel string and the B point at this time is read, and the error between the real value and the system value is directly corrected according to L6 so that the system display value is consistent with the real value.
[0032] When calibrating the turnout tamping vehicle:
[0033] Calibration of the front follow-up mechanical zero point and electrical zero point of the turnout tamping vehicle and the front and rear sensor proportion (the mechanical zero point is suitable for calibration after replacement of the follow-up cylinder):
[0034] The vehicle is loaded to the left, the positioning member 2 of the calibration ruler is abutted against the inner side of the left rail at the position of the front follower trolley, the steel string is clamped into the steel string clamping seat 4, the steel string is moved to the general center position of the front follower left-right direction, the steel string is clamped into the steel string clamping seat 4, and the distance L1 from the steel string to the positioning member 2 is read. Then the vehicle is loaded to the right, the positioning member 2 of the calibration ruler is abutted against the inner side of the right rail at the position of the front follower trolley, the original steel string position is not moved, the steel string is clamped into the steel string clamping seat 4, and the distance L2 from the steel string to the positioning member 2 is read. The half value L3 of L1+L2 is the mechanical zero position of the front follower. At this time, the front follower cylinder moves the steel string to the L3 position, the front follower sensor steel string is adjusted so that the front follower electrical zero point is displayed as zero. The mechanical zero point and the electrical zero point coincide. A distance (generally 500 MM) is moved to the right at the front follower steel string zero point L3 position, and whether the system display distance is consistent is checked. If not, the system value is calibrated. The system display distance is checked whether consistent when moving 500 MM to the left at the zero point position. If not, the electrical system is corrected.
[0035] Then the rear follower mechanical zero point and the electrical zero point and the proportion of the turnout rammer are calibrated in the same way.
[0036] The electrical zero point of the whole turnout rammer is calibrated.
[0037] A, B, C and D represent four detection positions of the turnout rammer, the positions of A and D are measured first, and then the positions of B and C are fixed. The vehicle is loaded to the left, the steel string is tensioned, the front follower at the D point is moved to zero, the positioning member 2 of the calibration ruler is abutted against the inner side of the rail at the left D point, the steel string is clamped into the steel string clamping seat 4, and the distance L1 between the steel string and the rammer D point at this time is read. In the same way, the distance from the rear follower steel string to the left A point is also L1. At this time, the sizes of the two calibration rulers are set at the position of L1, and the steel strings at B and C are clamped. The steel strings at B and C are also L1 to the left. The theoretical direction value is zero. If the value of the turnout system is not zero, it is adjusted to zero. (Generally, the turnout pointer is at the twelve o'clock position).
[0038] In the same way, the turnout rammer is loaded to the right, and the electrical zero point of the detection system of the right rammer is calibrated.
[0039] After the above calibration, the front and rear moving vehicles make the turnout meter at zero. The left-right proportion of the whole vehicle can be calibrated to ensure that the steel string does not move out of the red area no matter how the front and rear followers move. It is not related to the calibration ruler and is not described.
[0040] Further, the specific structure of the steel string clamping seat 4 includes a sliding seat sleeved on the ruler body 1 and capable of sliding relative to the ruler body 1, and the clamping plate 403 is rotatably arranged on the sliding seat. One end of the clamping plate 403 is provided with a clamping groove 407 arranged along the length direction of the clamping plate 403. In the initial state, the clamping plate 403 is in a parallel state (i.e., a horizontal state) with the ruler body 1, as shown in FIG. 2. During measurement, the steel string is clamped in the clamping groove 407, so that the clamping plate 403 is rotated by 90° from the original horizontal state to a vertical state, as shown in FIG. 3, and one end provided with the clamping groove 407 is on the top and the other end is on the bottom, thereby providing a condition for clamping the steel string into the clamping groove 407. The clamping plate 403 is arranged in a rotatable manner, thereby conveniently reducing the occupied space in the vertical direction when not measuring and facilitating storage. Figure 1 Figure 4 Further, the specific structure of the steel string clamping seat 4 includes a sliding seat sleeved on the ruler body 1 and capable of sliding relative to the ruler body 1, and the clamping plate 403 is rotatably arranged on the sliding seat. One end of the clamping plate 403 is provided with a clamping groove 407 arranged along the length direction of the clamping plate 403. In the initial state, the clamping plate 403 is in a parallel state (i.e., a horizontal state) with the ruler body 1, as shown in FIG. 2. During measurement, the steel string is clamped in the clamping groove 407, so that the clamping plate 403 is rotated by 90° from the original horizontal state to a vertical state, as shown in FIG. 3, and one end provided with the clamping groove 407 is on the top and the other end is on the bottom, thereby providing a condition for clamping the steel string into the clamping groove 407. The clamping plate 403 is arranged in a rotatable manner, thereby conveniently reducing the occupied space in the vertical direction when not measuring and facilitating storage.
[0041] Further, the specific structure of the steel string clamping seat 4 includes a sliding seat sleeved on the ruler body 1 and capable of sliding relative to the ruler body 1, and the clamping plate 403 is rotatably arranged on the sliding seat. One end of the clamping plate 403 is provided with a clamping groove 407 arranged along the length direction of the clamping plate 403. In the initial state, the clamping plate 403 is in a parallel state (i.e., a horizontal state) with the ruler body 1, as shown in FIG. 2. During measurement, the steel string is clamped in the clamping groove 407, so that the clamping plate 403 is rotated by 90° from the original horizontal state to a vertical state, as shown in FIG. 3, and one end provided with the clamping groove 407 is on the top and the other end is on the bottom, thereby providing a condition for clamping the steel string into the clamping groove 407. The clamping plate 403 is arranged in a rotatable manner, thereby conveniently reducing the occupied space in the vertical direction when not measuring and facilitating storage.
[0042] Further, the specific structure of the steel string clamping seat 4 includes a sliding seat sleeved on the ruler body 1 and capable of sliding relative to the ruler body 1, and the clamping plate 403 is rotatably arranged on the sliding seat. One end of the clamping plate 403 is provided with a clamping groove 407 arranged along the length direction of the clamping plate 403. In the initial state, the clamping plate 403 is in a parallel state (i.e., a horizontal state) with the ruler body 1, as shown in FIG. 2. During measurement, the steel string is clamped in the clamping groove 407, so that the clamping plate 403 is rotated by 90° from the original horizontal state to a vertical state, as shown in FIG. 3, and one end provided with the clamping groove 407 is on the top and the other end is on the bottom, thereby providing a condition for clamping the steel string into the clamping groove 407. The clamping plate 403 is arranged in a rotatable manner, thereby conveniently reducing the occupied space in the vertical direction when not measuring and facilitating storage.
[0043] Further, the specific structure of the steel string clamping seat 4 includes a sliding seat sleeved on the ruler body 1 and capable of sliding relative to the ruler body 1, and the clamping plate 403 is rotatably arranged on the sliding seat. One end of the clamping plate 403 is provided with a clamping groove 407 arranged along the length direction of the clamping plate 403. In the initial state, the clamping plate 403 is in a parallel state (i.e., a horizontal state) with the ruler body 1, as shown in FIG. 2. During measurement, the steel string is clamped in the clamping groove 407, so that the clamping plate 403 is rotated by 90° from the original horizontal state to a vertical state, as shown in FIG. 3, and one end provided with the clamping groove 407 is on the top and the other end is on the bottom, thereby providing a condition for clamping the steel string into the clamping groove 407. The clamping plate 403 is arranged in a rotatable manner, thereby conveniently reducing the occupied space in the vertical direction when not measuring and facilitating storage.
[0044] Further, the magnifying lens 402 and the clamping plate 403 are arranged staggered along the length direction of the ruler body 1. When the clamping plate 403 is arranged on the front side of the sliding seat, if the measurer faces the clamping plate 403 to measure, the clamping plate 403 will affect the measurer to observe the scale at the magnifying lens 402. Therefore, in order to avoid the clamping plate 403 blocking the view and to facilitate reading, the two are arranged staggered.
[0045] It should be noted that when the clamping plate 403 and the magnifying lens 402 are arranged staggered, the error of the number read by the magnifying lens 402 will be compensated at the zero position of the scale line 3 of the ruler body 1, so as to ensure that the number read by the magnifying lens 402 is the actual distance from the zero position to the clamping slot 407 of the clamping plate 403.
[0046] Further, the specific structure of the sliding seat includes an upper plate and a lower plate 406. In order to reduce wear, the lower plate 406 can be arranged as a plastic plate, and the upper plate can be arranged as a structure of an inner plastic lining plate 401a and an outer metal plate 401b. The inner plastic lining plate 401a of the upper plate and the lower plate 406 is connected by screws, and the outer metal plate 401b can be bonded to the inner plastic lining plate 401a by glue. Here, the outer metal plate 401b can be bonded to the front side and the upper side of the sliding seat. At this time, the two protrusions 409 on the front side are arranged on the outer metal plate 401b, and the mounting hole 408 on the upper surface and the magnifying lens 402 are arranged on the outer metal plate 401b.
[0047] Further, the locking member is a locking bolt 5, and the sliding seat is provided with a second threaded hole. The locking bolt 5 is threadedly connected to the second threaded hole. When it is necessary to move the position of the steel string clamping seat 4 as a whole, the locking bolt 5 is loosened. When it is necessary to fix the position of the steel string clamping seat 4, the locking bolt 5 is tightened, and the sliding seat is pressed and fixed.
[0048] Further, the outer side of the positioning member 2 is an arc surface. In this application, the positioning member 2 is arranged as a structure that the inner and outer sides are arc surfaces and the front and rear sides are flat surfaces. The maximum position of the arc height of the arc surface of the outer side is the zero position of the scale line 3. The arc surface is arranged to ensure that the contact between the positioning member 2 and the inner side of the rail is linear contact, so as to avoid the measurement error caused by the inaccurate zero position of the contact position due to the surface contact. The positioning member 2 is also arranged on the lower surface of the ruler body 1. This is to ensure that the positioning member 2 is in abutment with the inner side of the rail while the end of the ruler body 1 can be placed on the rail. This facilitates single-person operation and achieves the purpose of one person measuring.
[0049] Further, because the rail is weakly electrified, when the two ends of the ruler body 1 are placed on the rail, in order to avoid the ruler body 1 conducting electricity in some sudden situations, the two ends of the ruler body 1 are provided with insulating sleeves 6. This can avoid the problem of accidental conduction of the track circuit and the sudden change of the signal.
[0050] It needs to be understood that the reading of the scale of the application is realized by manual observation of the scale, and in order to facilitate reading, the scale can be upgraded to a digital reading mode.
[0051] The specific embodiments described above cannot be regarded as a limitation on the protection scope of the present application, and any alternative improvement or transformation made by those skilled in the art to the embodiments of the present application falls within the protection scope of the present application.
[0052] The details not described in the present application are well-known to those skilled in the art.
Claims
1. A calibration ruler for calibrating the track alignment accuracy of a tamping machine, characterized in that, include: The ruler body has a positioning element near one end. The positioning element abuts against the inner side of the rail during measurement. The ruler body has scale lines along its length, and the outer side of the positioning element is the zero point of the scale lines. A steel wire holder, wherein the steel wire holder is slidably disposed on the ruler body; A locking element is provided on the steel string holder for fixing the steel string holder.
2. The calibration ruler for calibrating the track alignment accuracy of a tamping machine according to claim 1, characterized in that, The steel wire holder includes: A slide block, which is slidably disposed on the ruler body; A card plate is rotatably mounted on the slide block, and one end of the card plate is provided with a card slot, which is arranged along the length direction of the card plate.
3. The calibration ruler for calibrating the track alignment accuracy of a tamping machine according to claim 2, characterized in that, The card plate is a rectangular plate with graduations along its length. The card slot is located at one end along the length of the card plate. The card plate has an adjustment hole inside. The slide has a first threaded hole. A bolt passes through the adjustment hole and is threadedly connected to the first threaded hole.
4. The calibration ruler for calibrating the track alignment accuracy of a tamping machine according to claim 2 or 3, characterized in that, The slide block has a cuboid structure, and the card plate is rotatably mounted on the side of the slide block. Two protrusions are provided at two opposite corners of the side of the slide block, and the vertical and horizontal spacing between the two protrusions is equal to the width of the card plate.
5. The calibration ruler for calibrating the track alignment accuracy of a tamping machine according to claim 2, characterized in that, The upper surface of the slide is provided with a mounting hole, and a magnifying lens is provided in the mounting hole. The magnifying lens is provided with a marking line.
6. The calibration ruler for calibrating the track alignment accuracy of a tamping machine according to claim 5, characterized in that, The magnifying lens and the card plate are offset from each other along the length of the ruler.
7. The calibration ruler for calibrating the track alignment accuracy of a tamping machine according to claim 5, characterized in that, The slide includes an upper plate and a lower plate, which are connected by screws.
8. The calibration ruler for calibrating the track alignment accuracy of a tamping machine according to claim 2, characterized in that, The locking element is a locking bolt, and the slide block is provided with a second threaded hole, and the locking bolt is threaded into the second threaded hole.
9. The calibration ruler for calibrating the track alignment accuracy of a tamping machine according to claim 1, characterized in that, The outer surface of the positioning component is an arc surface, and the maximum arc height of the arc surface is the zero point of the scale line. The positioning component is located on the lower surface of the ruler body.
10. The calibration ruler for calibrating the track alignment accuracy of a tamping machine according to claim 1, characterized in that, Insulating sleeves are provided at both ends of the ruler.